Статті в журналах: "Heat of exhaust gases"

1

Alekseenko, V. v., O. B. Sezonenko, and O. O. Vasechko. "RECUPERATION OF HEAT OF INCINERATORS FOR WASTE OF MEDICAL INSTITUTIONS." Energy Technologies & Resource Saving, no. 2 (June 25, 2018): 31–38. http://dx.doi.org/10.33070/etars.2.2018.04.

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Methods of reduction of temperature of exhausted gases for incinerators and features of their practical application were considered. Conditions of effective usage of recuperation of exhaust gases heat during thermal disposal of waste were considered. Methods of recuperation of exhaust gases heat of medical institutions’ waste were adduced and character ized. Evaluation of potential value of heat in exhaust gases of combustion of medical institutions’ waste was produced. Nonstationarity of the development of heat, typical of incinerators of medical institutions, which influence on coordination with load curve of potential heat consumer, was considered. The method of heat recuperation by heating of air, which is fed directly into incinerator, was offered. The constructive realization of this method and parameters of recuperator under working loads of incinerator were presented. Bibl. 11, Fig. 4, Tab. 2.

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2

KHAN, Mohammad Nadeem. "Energetic and Exergetic Investigation of Regenerative Gas Turbine Air-Bottoming/Steam -Bottoming Combined Cycle." Mechanics 27, no. 3 (June 10, 2021): 251–58. http://dx.doi.org/10.5755/j02.mech.25099.

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The present study is a thermodynamic analysis of a Regenerative Air-Bottoming combined (RABC) cycle /Steam bottoming combined (RABC) cycle operated by the exhaust gases the topping gas turbine cycle. The fractional mass of exhaust gases passes through the first heat exchanger where it exchanges heat with the compressed air from the air compressor of topping cycle and remaining amount of exhaust gasses passes through a second heat exchanger where it uses to supply heat to RABC cycle or third heat exchanger where it uses to supply heat to RSBC cycle. The energetic and exergetic performance of RABC cycle and RSBC cycle is investigated using turbine inlet temperature (1000 K⩽ TIT⩽1500 K) and mass fraction of exhaust gas (0⩽x⩽1) of the topping cycle as the input variables. The work net output attained its peak value at x=0 which is 22.1 % to 27.3 % for RABC cycle and 22.7 % to 21.5 % for RSBC cycle whereas the maximum thermal efficiency and minimum specific fuel consumption is observed at x=1. Also exergy loss by exhaust gases is minimum at x=0 for both RABC cycle and RSBC cycle. Finally, it is concluded that for the maximum work net output and minimum exergy loss by exhaust gases, RABC cycle is the best option followed by RSBC cycle but for optimum thermal efficiency and minimum specific fuel consumption purely regenerative gas turbine cycle have no comparison with RABC cycle and RSBC cycle.

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3

Fialko, Nataliia, Raisa Navrodska, Malgorzata Ulewicz, Georgii Gnedash, Sergii Alioshko, and Svitlana Shevcuk. "Environmental aspects of heat recovery systems of boiler plants." E3S Web of Conferences 100 (2019): 00015. http://dx.doi.org/10.1051/e3sconf/201910000015.

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The results of studies on improving the environmental characteristics of boiler plants of municipal heat-power engineering in the application of technologies for the deep recovery of heat from exhaust-gases of gas-fired boilers are presented. The data on the reduction of environment by reducing the amount and temperature of harmful emissions resulting from fuel combustion are given. The data are given for boiler plants equipped with complex heat-recovery systems characterized by cooling the exhaust-gases below the dew point of the water vapor contained in them. It is shown that the decrease in emissions is due to a decrease in fuel consumption in boilers due to the beneficial use of the heat of exhaust-gases in these systems and the dissolution of nitrogen and carbon oxides in the condensate, formed in the heat-recovery equipments. The analysis of improving the environmental safety of boiler plants when used in heat-recovery technologies of corrosion protection systems for chimneys has been performed. Anticorrosion protection is provided by preventing condensate formation in the exhaust-gas ducts of boiler plants when using technologies for the deep recovery of exhaust-gas heat. To prevent condensate formation, the method of pre-drying cooled exhaust-gases in a heat exchanger-preheater installed after heat-recovery equipment is used. It is also shown that the use of complex heat-recovery systems provides in the boiler plant additional water in the form of condensate formed during condensation of moisture from exhaust-gases. Receipt of this condensate is another ecological effect of heat-recovery, which allows reducing the consumption of natural water resources for supply municipal heat networks.

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4

Fialko, N., A. Stepanova, R. Navrodskaya, S. Shevchuk, and G. Sbrodova. "Optimization of operating parameters a heat-recovery exchanger of a boiler plant based on the exergy approach." Energy and automation, no. 2(54) (June 22, 2021): 5–16. http://dx.doi.org/10.31548/energiya2021.02.005.

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Abstract. The results of operating parameters optimization of the air-heating heat-recovery exchanger of complex heat recovery system of a gas-fired boiler designed for heating water and blown air are presented. Air heating in this heat-recovery exchanger is realized by deep cooling of the waste exhaust gases, that is, with a change in their moisture content during the heat recovery process. The possibilities of using a complex technique based on the structural-variant method and exergy analysis methods for the optimization of the heat-recovery exchanger are analyzed. The developed structural scheme of the boiler plant with identification of input and output exergy streams for all elements of the installation is presented. The change of exergy losses in this heat-recovery exchanger has a rather strong effect on the change of the whole heat recovery system efficiency is established. Thus, the optimization of heat-recovery exchanger operating parameters of is a necessary condition for increasing the efficiency of heat recovery in general. The choice of multiplicative exergy efficiency criteria used as target functions of operating parameters optimization of the investigated air-heating heat exchanger is substantiated. The obtained dependences of exergy efficiency criteria on the operating parameters of the heat-recovery exchanger, such as the ratio of the Reynolds numbers of exhaust gases and air and the ratio of the initial and final moisture content of exhaust gases, are analyzed. It is established that the minimum values of the efficiency criteria, which corresponds to the maximum exergy efficiency, is observed in the range of values of the ratio of the initial and final moisture content of exhaust gases in the range from 2.4 to 3.0. It is shown that at a value of the specified ratio of 2.7, the exergy efficiency of the investigated heat-recovery exchanger does not depend on the ratio of the Reynolds numbers of exhaust gases and air. It is established that of initial and final moisture content ratio of exhaust gases, equal to 2.7, and the Reynolds numbers ratio of exhaust gases and air, equal to 0.8 and 1.2, depending on the values of initial and final moisture content ratio of exhaust gases, can be taken as the optimal values of the operating parameters. Key words: heat-recovery exchangers, exergy efficiency, complex techniques

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5

Petrash, V. D., Yu N. Polunin, and N. V. Danichenko. "RANGE OF EXHAUST GASES PRE-COOLING IN THE IMPROVED HEAT PUMP SYSTEM OF HEAT SUPPLY." Bulletin of Odessa State Academy of Civil Engineering and Architecture, no. 83 (June 4, 2021): 139–47. http://dx.doi.org/10.31650/2415-377x-2021-83-139-147.

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The paper studies the range of possible and rational pre-cooling of exhaust gases in an improved heat pump of heating supply system in the development of its previously proposed basic version. The research has established analytical dependences for determining the energy flows of the condenser and evaporator, as well as the energy efficiency of the improved heat supply system. On their basis, a rational range of preliminary cooling of exhaust gases of rotary kilns was revealed, the upper level of which is determined, first of all, by their initial temperature. It has been established that the rational ratio of water consumption for heating systems with traditional temperature drops and hot water supply is in the range of 0.3-0.9. At the same time, an increase in energy efficiency is noted in the process of operational regulation of systems with a decrease in the ratio of the costs of heat carriers for technological and household purposes. The degree of precooling of exhaust gases, which significantly depends on their initial temperature, is in the range of 0.35-0.5 with a decrease in the corresponding flow rates of heat carriers in heating and hot water supply systems. The rational ratio of the consumption of the heating and heated medium in the process of contact interaction, which significantly depends on the initial temperature of the exhaust gases, is in the range of 0.2-1.2. For low-temperature waste gases (up to 500С), the reciprocal values of the analyzed ratio logically agree with the corresponding values of the irrigation coefficient. The results of the analytical study established multifactorial dependences of energy flows in the condenser and evaporator, as well as determining the energy efficiency of an improved heat pump of the heat supply system, on the basis of which the general range of possible pre-cooling of exhaust gases from rotary kilns was revealed.

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6

Bukowska, Maria, Krzysztof Nowak, Danuta Proszak-Miąsik, and Sławomir Rabczak. "Concept of Heat Recovery from Exhaust Gases." IOP Conference Series: Materials Science and Engineering 245 (October 2017): 052057. http://dx.doi.org/10.1088/1757-899x/245/5/052057.

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7

LESIAK, Krzysztof, Marek BRZEZANSKI, and Dariusz PROSTANSKI. "Concept of using the heat pipes in the heat exchanger of diesel engine exhaust system intended for use in potentially explosive atmospheres." Combustion Engines 177, no. 2 (May 1, 2019): 127–31. http://dx.doi.org/10.19206/ce-2019-222.

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Limiting the temperature of exhaust gases to below 150°C is one of the necessary conditions for diesel engine to be used in a potentially explosive atmosphere. For this purpose heat exchangers are necessary to be used. This article presents the concept of exchanger in which heat pipes are used to transport thermal energy from the exhaust gases to the cooling medium.

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8

Chandravanshi, Ajay, and Dr J. G. Suryawanshi Dr. J. G. Suryawanshi. "Waste Heat Recovery from Exhaust Gases through I C Engine Using Thermoelectric Generator." Indian Journal of Applied Research 3, no. 7 (October 1, 2011): 270–71. http://dx.doi.org/10.15373/2249555x/july2013/84.

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9

Veerabhadrappa, Kavadiki, K. N. Seetharamu, Chethan Kembhavi, Darshan Dayanand, Vinayakaraddy, and Rupanagudi Suresh Kumar. "Finite Element Analysis of Three-Fluid Heat Exchanger for Diesel Engine Exhaust Heat Recovery System." Applied Mechanics and Materials 592-594 (July 2014): 1607–11. http://dx.doi.org/10.4028/www.scientific.net/amm.592-594.1607.

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In internal combustion engines, only a part of the fuel energy flow is transformed into power available at the crankshaft, while the most part of the fuel energy flow is lost as coolant, exhaust gases and other waste heat flows.The focus of this study is to evaluate the performance of three-fluid re-circulating type heat exchanger to recover energy from exhaust gas The cold fluid is re-circulated to enhance the recovery of heat from the exhaust gases. Finite element model of the heat exchanger is developed based on the detailed geometry and the specific working conditions and the effectiveness of the heat exchanger is computed. Non-Dimensional parameters are introduced which makes the analysis more versatile. The effectiveness is computed for different values of NTU, Heat capacity ratios, Overall heat transfer coefficient ratio between fluid channels and the inlet temperature.

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10

Novichkov, Sergei, Irina Rostuntsova, and Natalia Schegoleva. "Boiler house exhaust gases heat for snow disposal." Energy Safety and Energy Economy 5 (October 2019): 20–24. http://dx.doi.org/10.18635/2071-2219-2019-5-20-24.

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11

Корниенко, Виктория Сергеевна, Роман Николаевич Радченко та Юрий Георгиевич Щербак. "УЛУЧШЕНИЕ ЭКОЛОГИЧЕСКИХ ПОКАЗАТЕЛЕЙ ДВИГАТЕЛЯ ВНУТРЕННЕГО СГОРАНИЯ ИСПОЛЬЗОВАНИЕМ СКРУББЕРНЫХ ТЕХНОЛОГИЙ И ЭФФЕКТА "МИКРОВЗРЫВОВ" КАПЕЛЬ ВОДОТОПЛИВНОЙ ЭМУЛЬСИИ". Aerospace technic and technology, № 8 (31 серпня 2019): 68–72. http://dx.doi.org/10.32620/aktt.2019.8.10.

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The rules of international organizations in the field of environmental protection are consistently tightening the requirements for the level of harmful emissions into the atmosphere from both stationary and ship power plants (SPP). To ensure this level, it is necessary to use wet scrubber technology and a hybrid system when used simultaneously or sequentially. The study aims to develop a wet scrubber scheme for сomplex exhaust gas cleaning system for an internal combustion engine (ICE). Experimental studies have shown that at the end of the combustion zone of a water-fuel emulsion (WFE) with a water content of 30 % due to the influence of intense turbulence created during microexplosions of WFE droplets in the zone of active combustion in gases, an equimolar NO2 : NO ratio is created automatically (or almost this). It is required to enhance the absorption properties of exhaust gases in front of the scrubber. It is established that when WFE is burnt with water content Wr = 30 %, the content of toxic ingredients in the exhaust gases in front of the scrubber will be at a much lower level compared to the cleaning system at Wr = 2 %. A scheme of a wet scrubber has been developed, which allows to clean exhaust gases from three toxic exhaust gas ingredients simultaneously with heating water to exhaust gas boiler and drying wet gases after a wet scrubber due to the heat of the intermediate coolant. It has been established that the heat of this intermediate coolant is sufficient not only to heat the feed water of the exhaust gas boiler, but also to provide a hot water supply system for the ship, since in the scrubber, as a result of exhaust water vapor condensation up to 8 % of the lower combustion heat of the fuel burned power units. Analysis of the calculated studies showed that the using of a wet scrubber reduces the NOx content from 258 ppm to 52 ppm, SO2 - from 107 ppm to 22 ppm, CO2 - from 3.1 % to 0.93 %. The developed wet scrubber scheme can be used to clean the exhaust gases of internal combustion engines from toxic ingredients and to provide the necessary level of exhaust gas purification recommended by the IMO (International Maritime Organization).

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12

Радченко, Роман Миколайович, Максим Андрійович Пирисунько, Нiн Чен та Баочен Хан. "ОХОЛОДЖЕННЯ ПОВІТРЯ НА ВХОДІ МАЛООБЕРТОВОГО ДВИГУНА ЕЖЕКТОРНОЮ ХОЛОДИЛЬНОЮ МАШИНОЮ ПРИ ЕКСПЛУАТАЦІЇ СУДНА В ТРОПІЧНИХ УМОВАХ". Aerospace technic and technology, № 1 (25 січня 2020): 17–21. http://dx.doi.org/10.32620/aktt.2020.1.03.

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The efficiency of air cooling at the inlet of the main low-speed engine turbocharger of a transport vessel during operation in tropical climatic conditions on the Shanghai-Singapore-Shanghai route was analyzed. A feature of the tropical climate is the high relative humidity, respectively, moisture content at its simultaneously high temperatures. The cooling of the air at the inlet of a low-speed engine with an ejector chiller by transforming the waste heat of exhaust gases into cold was studied. The ejector chiller is used as the most simple and reliable in operation. However, the efficiency of the transformation of heat into cold by ejector chillers is low - low thermal coefficients.A design solution of the system for cooling air at the inlet of the ship's main engine using the heat of the exhaust gases by an ejector chiller is proposed and analyzed. The effect of using the heat of the exhaust gases to cool the air at the engine inlet is analyzed taking into account the variable climatic conditions during the voyage of the vessel. It is shown that because of the insufficiently high efficiency of transforming the waste heat of the exhaust gases by an ejector chiller (low thermal coefficients), the obtained cooling capacity is not sufficient for cooling the air at the inlet of the turbocompressor during operation of a marine engine in tropical climatic conditions. Therefore, the possibility of use in the ejector chiller of additional heat of charge air, which is removed by cooling water, is also considered. It is shown that the use of the heat of exhaust gases and charge air for cooling the air at the engine inlet in an ejector chiller makes it possible to double decrease the air temperature at the inlet of the main engine by 20-30 °C when the vessel operates in tropical climatic conditions on a voyage lines Shanghai-Singapore-Shanghai. This, in turn, provides an almost twice fuel consumption reduction in compared with its reduction in the case when the ejector chiller uses only the heat of the exhaust gases.

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13

Dudkiewicz, Edyta, and Paweł Szałański. "A review of heat recovery possibility in flue gases discharge system of gas radiant heaters." E3S Web of Conferences 116 (2019): 00017. http://dx.doi.org/10.1051/e3sconf/201911600017.

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Heating of large-cubage buildings accounts for significant share of energy consumption. The radiant heating system using gas heaters is a common solution for large-cubage halls and is considered to be energy efficient. There is a possibility of additional heat energy recovery from the flue gases of gas radiant heaters because new solutions were introduced to the market. Furthermore heat recovery consists the most promising solution and develop during the recent years rapidly. On the other hand, few works have been dedicated to heat recovery from exhaust gas but none of them consider exhaust gas from radiant heaters. Exhaust gas temperature depends on the type and efficiency of the gas heater. The selection of both the type of radiant heaters and the heat recovery system requires many factors to be taken into account. This study consider possibilities for application of different heat exchangers in exhaust gases system of gas radiant heaters. The authors propose to classify exhaust gas heat recovery systems in dependence on intermediary medium: water/air, gas heaters type: ceramic/tube and number (single/group) and their mounting location.

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14

WOJCIECHOWSKI, Krzysztof, Jerzy MERKISZ, Paweł FUĆ, Joanna TOMANKIEWICZ, Rafał ZYBAŁA, Juliusz LESZCZYŃSKI, Piotr LIJEWSKI, and Paweł NIERODA. "Prototypical thermoelectric generator for waste heat conversion from combustion engines." Combustion Engines 154, no. 3 (September 1, 2013): 60–71. http://dx.doi.org/10.19206/ce-116986.

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The work presents experimental results of performance tests and theoretical calculations for the thermoelectric generator TEG fitted in the exhaust system of a 1.3 dm3 JTD engine. Benchmark studies were carried out to analyze the performance of the thermoelectric modules and total TEG efficiency. Additionally the investigation of combustion engine’s power drop casued by exhaust gasesflow resistance is presented. The detailed studies were performed using a new prototype of the thermoelectric generator TEG equipped with 24 BiTe/SbTe modules with the total nominal power of 168 W. The prototypical device generates maximal power of200 Wfor the exhaus gases massflow rate of 170 kg-h-1 and temperature of280 oC. Power drop caused by the flow resistance of gases ranges between 15 and 35 mbarfor mass flow rate 100-180 kg-h-1. We predict that the application of the new thermoelectric materials recently developed at AGH would increase the TEG power by up to 1 kW, would allow the increase of the powertrain system efficiency by about 5 %, and a corresponding reduction of C02 emission.

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15

Nemś, Artur, Mikołaj Simiński, Magdalena Nemś, and Tomasz Magiera. "Analysis of car waste heat recovery system utilizing thermoelectric generator." AUTOBUSY – Technika, Eksploatacja, Systemy Transportowe 19, no. 6 (June 30, 2018): 619–26. http://dx.doi.org/10.24136/atest.2018.144.

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This paper presents a calculation algorithm for a thermoelectric generator fitted in the exhaust system of a combustion engine. The viability of the presented calculation method was verified on an actual combustion engine. The calculations were performed for a BMW engine, and the generator design was based on a prototype from the same manufacturer. The paper includes calculations of the thermal cycle and of the parameters of exhaust gases from the engine. Subsequent calculations cover heat transfer from exhaust gases to the thermoelectric module and the amount of electric energy obtained from a series of modules. In the last part, the focus is on the influence of engine speed on the performance of the thermoelectric generator.

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16

Popa, Rm, AT Borborean, V. Stoica, and I. Ionel. "Study concerning the thermal energy balance in an internal combustion engine." IOP Conference Series: Earth and Environmental Science 960, no. 1 (January 1, 2022): 012012. http://dx.doi.org/10.1088/1755-1315/960/1/012012.

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Abstract In this scientific report the steps for achieving the energy balance on a test engine Daewoo 1.6 liter in 4 cylinders, with 4 valves per cylinder, its power being77 kW, are presented. The engine was connected to a hydraulic brake during the tests. The energy balance was established, based on measurements applied on the stand test, focusing to determine the lost heat and to conceive a Sankey diagram, accordingly. Two sets of measurements were performed and based on them the heat losses were determined and two Sankey diagrams were depicted. The lost heat through the cooling fluid is determined by measuring the cooling water flow rate and its inlet and outlet temperature. The lost heat through the exhaust gases is determined by the difference between the enthalpy of the exhaust gases and the enthalpy of fresh air. The lost heat due to incomplete chemical combustion is determined by analyzing the composition of the exhaust gases. The measurements are centralized on a graphic user interface, supported by a NI Compact RIO platform.

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17

DOROKHOV, ALEKSEI S. "EXHAUST GAS HEAT UTILIZATION IN SEPARATING WORKING UNITS OF ROOT CROP AND POTATO HARVESTERS." Agricultural engineering, no. 2 (2022): 4–7. http://dx.doi.org/10.26897/2687-1149-2022-2-4-7.

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Harvesting potatoes and vegetable crops coincides with the seasonal peak of precipitation. As a result, the factor complicates the cleaning of marketable products from highly humid soil impurities, which cause the working surface sticking of cleaning devices and decrease their performance. To eliminate this problem, the authors carried out theoretical studies of the separation system working on thermal energy for cleaning the exhaust gases of the power plant. The goal was to determine the design and technological parameters of its individual functioning elements. Relationships were established to determine the separating surface area of slotted cleaning units – a bar elevator and a cleaning sprocket. The analysis helped determine the inter-axial distance between the deflectors, the inter-deflector distance, the inter-conveyor distance, and the translational speed of the rod elevator. The authors obtained the heat flow distribution pattern of exhaust gases on the separating units of root crop and potato harvesters. The study outcomes – the operating modes and technological parameters of the separating system using the heat of exhaust gases for harvesting root crops and potatoes and the heat flow distribution pattern of exhaust gases over the separating surface – will be helpful for further experimental research to improve individual units for harvesting root crops.

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18

DOROKHOV, ALEKSEI S. "EXHAUST GAS HEAT UTILIZATION IN SEPARATING WORKING UNITS OF ROOT CROP AND POTATO HARVESTERS." Agricultural engineering, no. 2 (2022): 4–7. http://dx.doi.org/10.26897/2687-1149-2022-2-4-7.

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Harvesting potatoes and vegetable crops coincides with the seasonal peak of precipitation. As a result, the factor complicates the cleaning of marketable products from highly humid soil impurities, which cause the working surface sticking of cleaning devices and decrease their performance. To eliminate this problem, the authors carried out theoretical studies of the separation system working on thermal energy for cleaning the exhaust gases of the power plant. The goal was to determine the design and technological parameters of its individual functioning elements. Relationships were established to determine the separating surface area of slotted cleaning units – a bar elevator and a cleaning sprocket. The analysis helped determine the inter-axial distance between the deflectors, the inter-deflector distance, the inter-conveyor distance, and the translational speed of the rod elevator. The authors obtained the heat flow distribution pattern of exhaust gases on the separating units of root crop and potato harvesters. The study outcomes – the operating modes and technological parameters of the separating system using the heat of exhaust gases for harvesting root crops and potatoes and the heat flow distribution pattern of exhaust gases over the separating surface – will be helpful for further experimental research to improve individual units for harvesting root crops.

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19

Dorokhov, A. S., А. G. Aksenov, A. V. Sibirev, M. A. Mosyakov, and N. V. Sazonov. "Study of an Exhaust Gas Heat Separation System for the Beet Harvester." Agricultural Machinery and Technologies 16, no. 1 (March 18, 2022): 19–26. http://dx.doi.org/10.22314/2073-7599-2022-16-1-19-26.

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It was noted that increased soil moisture worsens the quality of harvesting root crops due to a decrease in the completeness of separation. To increase the separating capacity of a slotted cleaner for root crops, it was proposed to improve the heating of the separating surface with hot exhaust gas. (Research purpose) To optimize the design and technological parameters of an exhaust gas heat separation system of the sugar beet harvester power plant. (Materials and methods) Federal Scientific Agroengineering Center VIM developed an exhaust gas heat separation system for harvesting root crops and potatoes in high moisture conditions using the heat of the harvester power plant exhaust gases. The cleaning quality of the separating system of a self-propelled sugar beet harvester was determined under the gradual engine load from 0 to 100 percent of the nominal rated power. The temperature of the exhaust gases was measured with the assumption of changes in the engine load and its effective power. (Results and discussion) The experiment revealed an increase in the completeness of the separation of a root crops heap from 96.0 to 98.8 percent at 26-32 percent soil moisture due to the separation system in the form of a cleaning star, which uses the heat of the engine exhaust gases. The established optimal values of the factors under consideration are as follows: the separating star rotation rate is 21.8 revolutions per minute, the distance between the separating star and the deflector is 128.4 millimeters. (Conclusions) It was determined that the high quality of the technological process of root crops harvesting in high soil moisture conditions ensuring a 97-percent separation efficiency is possible if optimize the separating device design and technological parameters and maintain the separating star rotation rate at 20-22 revolutions per minute and the distance between the separating star and the deflector within 120-140 millimeters. The authors noted the prospects of developing this system and the need for theoretical and experimental studies to improve the design and technological process of the harvester separating system.

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Gleizer, A. I. "Piston Engine with Internal Recuperation of Exhaust Gases." Izvestiya MGTU MAMI 3, no. 2 (January 20, 2009): 52–56. http://dx.doi.org/10.17816/2074-0530-69557.

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21

Aydemir, Ali, and Markus Fritz. "Estimating excess heat from exhaust gases: why corrosion matters." Energy, Ecology and Environment 5, no. 5 (June 2, 2020): 330–43. http://dx.doi.org/10.1007/s40974-020-00171-5.

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22

Пирисунько, Максим Андрійович, Роман Миколайович Радченко, Андрій Адольфович Андреєв та Вікторія Сергіївна Корнієнко. "ЗМЕНШЕННЯ ВИКИДІВ СУДНОВОГО ДИЗЕЛЯ УТИЛІЗАЦІЄЮ ТЕПЛОТИ РЕЦИРКУЛЯЦІЙНИХ ГАЗІВ ЕЖЕКТОРНОЮ ХОЛОДИЛЬНОЮ МАШИНОЮ". Aerospace technic and technology, № 4 (31 серпня 2019): 20–24. http://dx.doi.org/10.32620/aktt.2019.4.04.

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The problem of air basin pollution of the World Ocean with harmful emissions from the exhaust gases of marine diesel engines is primarily associated with the creation of highly efficient technologies for the neutralization of nitrogen oxides NOx on exhaust gases from a diesel engine. Emissions of harmful substances from the combustion of marine fuels are limited by international atmospheric protection programs and the requirements of the International Maritime Organization (IMO). The requirements relate to almost all groups of harmful emissions in marine engines and the more stringent of them are primarily related to nitrogen oxides NOx and sulfur oxides SOx. To reduce harmful emissions from exhaust gases into the environment, scientists and world engine leaders use and suggest various methods for reducing the content of harmful substances in exhaust gases. The implementation of new standards in the areas of further improvement of the working process, the use of alternative fuels, fuel, and air additives, as well as selective catalytic reduction systems do not preclude further development of scientific research in the field of exhaust gas cleaning. One of the promising ways in environmentalizing marine internal combustion engines is the neutralization of harmful substances in exhaust gases through particular gas recirculation (EGR-technology). However, the use of such techniques conflicts with the engine's energy efficiency. In the work presented, the scheme-design solution of the exhaust gas recirculation system with using the heat of recirculation gases by an ejector refrigeration machine for cooling the air at the intake of ship's main engine is proposed. The effect of using the heat of recirculation gases for cooling the air at the intake of the engine is analyzed taking into account the changing climatic conditions for a particular vessel's route line. It is shown that the use of an ejector refrigeration machine reduces the air temperature at the entrance of the main engine by 5…15 ° С, which reduces the specific fuel consumption. This reduces emissions of harmful substances when the engine is running with recirculation of gases.

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Fialko, N., R. Navrodska, S. Shevchuk, G. Presich, and G. Gnedash. "Prevention of condensation in chimneys of boiler plants with heat-recovery systems." Energy and automation, no. 4(56) (August 30, 2021): 5–17. http://dx.doi.org/10.31548/energiya2021.04.005.

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The results of studies of the effectiveness of using the air method of preventing condensation formation in the gas-exhaust ducts for anticorrosive protection of chimneys of gas-fired heating boiler plants are presented. This method is used in heat-recovery systems of boiler plants, characterized by deep cooling of gases (below the dew point temperature of water vapor contained in exhaust-gases). The essence of this method is to change the thermal and humidity characteristics of exhaust-gases after heat-recovery by mixing dry and heated air in front of the chimney. Schematic solutions of heat-recovery systems using two options for using the air method are presented. The first option corresponds to the use of the air method when mixing air from the heater of boiler plant. In the second option, for the implementation of the air method, air heated in the heat-recovery system itself is used. To assess the efficiency of the air method, computational studies were carried out to determine the thermal and moisture characteristics of flue gases at the mouth of different types of chimneys under different operating modes of the boiler during the heating period. The studies were carried out for two proposed options for using the air method when using air with a change in its temperature over a wide range. The values of the dew point of the flue gases at the mouth of the chimney and the temperature of its inner surface were calculated at various proportions of the mixed air. The parameters of flue gases and mixed air were determined, ensuring the absence of condensation in the chimneys. Based on the values of the obtained parameters, a comparative analysis of the effectiveness of the considered options for using the air method was carried out. It is shown that for heating boilers the use of this method is the most effective in complex heat-recovery systems when using recovered heat for heating return heat-network water and combustion air. Key words: gas-fired boilers, exhaust-gases, deep cooling, air method, thermal and humidity condition, chimney, anticorrosive protection

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24

Kumar, Bangaru Bharath. "Numerical Study of Exhaust Manifold." International Journal for Research in Applied Science and Engineering Technology 10, no. 4 (April 30, 2022): 856–62. http://dx.doi.org/10.22214/ijraset.2022.41394.

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Abstract: The Exhaust manifold is an important component which affects the performance of the I.C engine. The exhaust system for any type of vehicle consists of an exhaust manifold, catalytic converter, resonator and a muffler which is connected to a tailpipe. Exhaust gases at the end of exhaust stroke are sent to the exhaust manifold through exhaust valves. The exhaust manifold has to withstand and operate under high exhaust temperature and pressure. The design aspect of the exhaust manifold has to be done through trial and error method to find the optimum layout to extract the performance of the manifold. In this paper, we will analyse the exhaust manifold through conjugate heat transfer. Keywords: Exhaust Manifold, Solidworks, Ansys, Conjugate Heat Transfer

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Коновалов, Дмитро Вікторович. "ЗАСТОСУВАННЯ ГАЗОДИНАМІЧНОГО ОХОЛОДЖЕННЯ В СИСТЕМАХ РЕЦИРКУЛЯЦІЇ ВІДХІДНИХ ГАЗІВ СУДНОВИХ ДИЗЕЛІВ". Aerospace technic and technology, № 7 (31 серпня 2019): 81–86. http://dx.doi.org/10.32620/aktt.2019.7.11.

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Анотація:

There are many ways and methods to reduce exhaust gases emissions on modern ships. One of the most effective ways to reduce NOx and SOx emissions is to use of exhaust gas recirculation (EGR technology). The EGR system disadvantage is an increase in back pressure through additional pressure losses in the scrubber and heat ex-changer, which entails an engine fuel efficiency deterioration. Creating a reliable and efficient heat exchanger for cooling recirculation gases is a complex task due to deposits and pollution emitted by these gases. In the pre-sent work, the jet apparatus effectiveness named aerothermopressor is analyzed in the scheme with exhaust gases recirculation of the ship low-speed two-stroke engine. Aerothermopressor is a two-phase jet for contact disperse cooling, in which by increasing the heat from the gas stream the gas pressure and cooling are increased. The calculation of the characteristics of the engine was carried out, both in nominal, and in operating modes and in all possible range of partial loads. The installation of the aerothermopressor before the scrubber is pro-posed, which allows reducing engine thermal load. Increasing the pressure in the aerothermopressor by 0.2-0.4 ∙ 105 Pa (6-12 %) allows reducing the back pressure in the gas exhaust system and thus reducing the load on the exhaust gas recirculation fan and when the engine load is higher than 75% in the cold zone, the fan is not need-ed, which additionally allows to reduce the specific fuel consumption. The parameters of the exhaust gases that are going to be recirculated and the processes of their gas-dynamic cooling in the aerothermopressor are based on the developed technique and program using the thermodynamic and gas dynamics equations. The proposed scheme-design solution allows at a high environmental friendliness of the existing exhaust gas recirculation sys-tem to provide a certain reduction in specific fuel consumption. It was determined that the engine specific fuel consumption has been decreasing when the aerothermopressor is used to Dge = 2.5-3.0 g/(kW·h) (1.5-1.7%).

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26

Berdnikov, A. A. "Processes occurring in an engine with an unconventional duty cycle." Izvestiya MGTU MAMI 11, no. 2 (June 15, 2017): 2–7. http://dx.doi.org/10.17816/2074-0530-66874.

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An internal combustion engine is a thermal machine that converts thermal energy into mechanical energy. Currently, the existing engines operate in cycles of Otto, Diesel and Sabate-Trinkler. Such cycles are usually called traditional. As is known, traditional internal combustion engines do not have a high coefficient of efficiency due to large losses of heat with exhaust gases, heat removal to the cooling system, etc. The reserves of increasing the efficiency are very high. However, modern engine building has reached a high level and further improvement of the working process in traditional cycles is already ineffective. The article proposes a non-traditional seven-stroke internal combustion engine and examines the processes occurring in the cylinders of such an engine. In the main cylinder of the engine, the working cycle proceeds as in a traditional four-stroke internal combustion engine: at the first stroke, there is an intake, on the second stroke - compression, on the third - combustion and operating stroke, but in the fourth cycle the exhaust gases are not diverted from the cylinder, but are sent to an additional cylinder - there is a continued expansion of gases (operating stroke). At the fifth bar, the exhaust gases are compressed in an additional cylinder, and water is supplied at the end of the compression. Selecting heat from the heated parts of the cylinder-piston group and compressed gases, the water evaporates, and the expanding steam performs useful work (the sixth stroke is the operating stroke). At the seventh stroke, the piston moves to the top dead center, displacing the steam with the exhaust gases. Preliminary calculations showed that the maximum pressure of the seven-cycle operating cycle of the internal combustion engine can reach up to 20 MPa, this increases the power and fuel economy of the engine. The injection of water somewhat reduces the maximum cycle temperature and the toxicity of the exhaust gases. Such advantages give reason for the implementation of the working cycle of the internal combustion engine in a seven-cycle scheme.

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Dorohov, Aleksey, Aleksandr Aksenov, Aleksey Sibirev, Maksim Mosyakov, and Nikolay Sazonov. "THEORETICAL BACKGROUND OF INCREASING THE SEPARATING SYSTEM OF A ROOT HARVESTING MACHINE WITH THERMAL ENERGY OF THE EXHAUST GAS SYSTEM." Vestnik of Kazan State Agrarian University 16, no. 1 (April 15, 2021): 71–76. http://dx.doi.org/10.12737/2073-0462-2021-71-76.

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To improve the quality indicators of harvesting root crops in conditions of high humidity, it is proposed to mount a separating device on the combine, which ensures the separation of root crops from soil and plant impurities with simultaneous blowing of their surface with hot exhaust gases from the power plant of the harvesting machine. Heat losses with exhaust gases (Q_G = 51960 J/s) exceed its amount equivalent to useful work (Q_A = 50900 J/s), therefore, it is necessary to ensure efficient use of the heat released into the atmosphere to increase the efficiency of the energy component of harvesting root crops and potatoes in conditions of high soil moisture. The aim of the study is to theoretically substantiate the improvement of the quality of separation of sugar beet root crops in conditions of high humidity with the use of blowing the working surface of the cleaning devices with exhaust gases from the power plant of the self-propelled harvester in the separation system of the harvester. The subject of research is the separation system of a combine harvester, represented by a cleaning star with installed deflectors for blowing the working surface. The condition for the uniform distribution of a heap of commercial products over the separating working surface is determined and theoretical dependences of the angular velocity v_EL and the rotational speed n_SP of the separating star on the forward speed of the sweeper and the radius of the separating star with uniform blowing of exhaust gases on the working surface are obtained

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Chodkiewicz, R., J. Krysinski, and J. Porochnicki. "A Recuperated Gas Turbine Incorporating External Heat Sources in the Combined Gas-Steam Cycle." Journal of Engineering for Gas Turbines and Power 124, no. 2 (March 26, 2002): 263–69. http://dx.doi.org/10.1115/1.1448325.

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The recuperation by means of external waste heat sources, as opposed to the recuperation of the turbine exhaust gases (to preheat the compressed air), allows one to utilize the hot exhaust gases of the gas turbine in the bottoming steam cycle to produce steam in order to generate additional power. Such a combined gas/steam energy system, closely integrated with the industrial process, can produce electric power (and useful heat) with high efficiency and very low atmospheric air pollution. In the present paper two examples of applications of this new technology have been analyzed from the economic and ecological viewpoint.

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Kukis, V. S., and E. A. Omel'chenko. "Reducing the emission of solid particles from the exhaust gases of the internal combustion engine by increasing the efficiency of the catalytic converter." Izvestiya MGTU MAMI 12, no. 4 (December 15, 2018): 49–54. http://dx.doi.org/10.17816/2074-0530-66835.

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The subject of consideration in the article was the assessment of the possibility of reducing the emission of solid particles from the exhaust gases of reciprocating internal combustion engines, which is needed to intensify the activities to reduce their harmful effects on the environment and on the human body. The aim of the work was to assess the possibility of increasing the efficiency of reducing emissions of solid particles with diesel exhaust gases due to the possible stabilization of the temperature of their exhaust gases in front of the catalytic converter. The object of the study was the emissions of solid particles with exhaust gases of diesel engine 4ChN13/15. The experiments were carried out with a KND-Rila type catalytic converter. To reduce the temperature fluctuations of the exhaust gases entering it when the diesel engine is operating in various modes, the authors have created a shell-and-tube type heat exchanger with a heat storage substance - lithium hydroxide. A gravimetric method was used to determine the solids content. The test complex included the MT-120 dilution tunnel developed by the TUV-UVMV institute (Czech Republic), the sampling system on a loading test bench, the Mettler Toledo AX26DR weigher for filter weighing (in a climate chamber on a vibration-insulating foundation, with an accuracy of 2 μg) and filters - “Pall Flex”. The study was conducted when the diesel engine operates on test cycles for variable speed engines according to UNECE Regulation No. 96-02. The method of assessing the effect of stabilization of the exhaust gas temperature on the efficiency of the catalytic converter with respect to the emission of solid particles was to determine the average degree of conversion of solid particles in the neutralizer during the test cycle. The test results showed that the stabilization of the temperature of the exhaust gases in front of the catalytic converter provided a relative improvement in the degree of conversion of solid particles by 56.7%.

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Fialko, N. M., R. A. Navrodskaya, G. A. Presich, G. A. Gnedash, S. I. Shevchuk, and O. V. Martiuk. "INCREASE OF ECOLOGICAL EFFECTIVENESS OF COMPLEX HEAT-RECOVERY SYSTEMS FOR BOILER PLANTS." Industrial Heat Engineering 40, no. 2 (June 20, 2018): 27–32. http://dx.doi.org/10.31472/ihe.2.2018.04.

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It is revealed that the humidifying of blown air in complex heat recovery systems of gas-fired boiler plants provides the significant reduction in the concentration of nitrogen oxides in exhaust-gases due to the suppression of their formation in the boiler furnace when moisture is introduced with this air. Problems of environmental protection and energy-saving became priority in world practice. The main directions of deciding these pressing problems in municipal heat-power engineering is to improve the environmental indicators of heating boiler plants and increase the efficiency of using fuel in them through the use of technologies for deep recovery of the exhaust-gases heat. The relevance of scientific problems in these directions is increasing due to the steady increase in the fuel-energy costs and the strengthening of requirements to reducing environmental pollution. When using these technologies of deep heat-recovery of exhaust-gases, the condensation mode of the heat-recovery equipment is realized, when, apart from to the so-called clear heat of these gases, the latent heat of condensation of the water vapor contained in them is also used. The condensation mode implementation also improves the ecological indicators of the boiler due to the reduction of fuel consumption and the dissolution in the resulting condensate of a part of harmful emissions formed during its combustion. The use of modern heat-recovery technologies for the gasfired boiler plants with complex use of recovered heat for the preheating of boiler water, water of the chemical waterpurification system and blowing air makes it possible to reduce fuel consumption in the boiler and, accordingly, its harmful emissions by 8...12 %. Humidification of the blowing air through the use of the recovery heat also provides a reduction of nitrogen oxides emissions to 60 % by suppressing their formation in the boiler combustion chamber.

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Xiao, Guo Quan. "Mechanism Investigations of Fluid-Solid Conjugate Heat Transfers for Vehicle Exhaust System." Applied Mechanics and Materials 229-231 (November 2012): 419–23. http://dx.doi.org/10.4028/www.scientific.net/amm.229-231.419.

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A conjugate heat transfer study was undertaken using STAR-CD. The boundary conditions are given by vehicle operation and engine operation. All three mechanisms of heat transfer, i.e., convection, conduction, and radiation, were included in the analysis. The vehicle exhaust system components temperatures were analysized at certain several separate variables such as the velocity and temperature of the exhaust gases which depend on the engine operation conditions and the velocity and temperature of the external airflows which depend on vehicle operations. The results showed all three mechanisms of heat transfer and increased quantitative understanding of the flow conditions surrounding vehicle exhaust system.

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Ellappan, R., J. Manoj Karan, and K. Nandu Narayanan. "Generation of Electricity from the Waste Heat of an IC Engine Using Thermo Electric Device." Applied Mechanics and Materials 813-814 (November 2015): 841–45. http://dx.doi.org/10.4028/www.scientific.net/amm.813-814.841.

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Electricity is very vital in our day to day life. The motive of our journal is to generate electricity from the from the exhaust gases of an internal combustion engine by the principle of Seebeck effect.Exhaust gases from an automobile bring out the excess heat generated which would be very high.The idea is to convert this exhaust heat to another form of energy i.e., electricity with the help of thermoelectric devices like thermocouples, thermopiles, Peltier device. The voltage generated by the thermocouple is very small and many thermocouples are required to make a practical thermoelectric generator. If a loop is made from wires using two dissimilar metals, a voltage will appear between the junctions of the wires if one junction is hotter than the other. Such a loop made with dissimilar metals is known as a thermocouple and the phenomenon is named the Seebeck effect. A semi conductor thermocouple device named Peltier device is used to convert the exhaust heat generated from an automobile into electricity.

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Sendyka, Bronislaw, and Jacek Soczowka. "RECOVERY OF EXHAUST GASES ENERGY BY MEANS OF TURBOCOMPOUND(Diesel Engines, Performance and Emissions, Heat Recovery)." Proceedings of the International symposium on diagnostics and modeling of combustion in internal combustion engines 2004.6 (2004): 99–103. http://dx.doi.org/10.1299/jmsesdm.2004.6.99.

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Arsenyeva, Olga P., Lidija Čuček, Leonid L. Tovazhnyanskyy, Petro O. Kapustenko, Yana A. Savchenko, Sergey K. Kusakov, and Oleksandr I. Matsegora. "Utilisation of waste heat from exhaust gases of drying process." Frontiers of Chemical Science and Engineering 10, no. 1 (February 20, 2016): 131–38. http://dx.doi.org/10.1007/s11705-016-1560-8.

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Khaled, Mahmoud, Mohamad Ramadan, and Hicham El Hage. "Parametric Analysis of Heat Recovery from Exhaust Gases of Generators." Energy Procedia 75 (August 2015): 3295–300. http://dx.doi.org/10.1016/j.egypro.2015.07.710.

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Surma, Mariusz, Zbigniew Zdrojewski, Stanisław Peroń, Klaudiusz Jałoszyński, and Bogdan Stępień. "Assessment of Utilization Possibilities of Heat Conducted by Waste Gases Exhaust Pipe of SB 1.5 Drum Drier for Drying Wood Chips." Agricultural Engineering 20, no. 1 (April 1, 2016): 195–203. http://dx.doi.org/10.1515/agriceng-2016-0020.

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AbstractBased on the exploitation research, the authors evaluated the possibilities of using the heat conducted through the side surface of the waste gases exhaust pipe of SB 1.5 drum drier for drying wood chips. According to the estimated calculations within one hour approximately 173 thousand of kJ of heat may be obtained from the external surface of the waste gases exhaust pipe with the height of 7 m and temperature of approximately 78°C which constitutes an equivalent of approximately 4 kilo of heating oil. In case the above mentioned heat source for drying wood chips in SPA 20 silo with a volume of 6800 kilo within 50% to 20% humidity is used, one may expect that the drying time will be approximately 100 hours.

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Cravero, Carlo, and Alessandro Spoladore. "Transient Numerical Simulation of Regenerative Systems with Waste Gas Recirculation Strategies in Glass Production Plant." Applied Sciences 9, no. 7 (April 10, 2019): 1496. http://dx.doi.org/10.3390/app9071496.

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The glass production industry has one of the highest energy consumption rates and environmental emission impacts with respect to the existing industrial sectors. Glass furnaces nowadays are conceived with regenerative systems to take advantage of the residual heat from the combustion exhausts in order to increase the thermal efficiency of the system. The exhaust gases are also used in innovative systems to reduce the NOx emissions in specifically designed gas recirculation systems tailored to the glass furnace. In this paper, a numerical model for the simulation of the regenerative chambers in both steady and unsteady conditions is presented. The option of gas recirculation is also included. Special attention has been focused on the radiative heat transfer from the recirculated gases using a gas emissivity model previously developed by the authors.

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38

Kaczmarek, Radomir, and Aleksander Stachel. "Analysis of the possibility of utilization of waste heat from the marine engine in the ORC power plant." E3S Web of Conferences 70 (2018): 01006. http://dx.doi.org/10.1051/e3sconf/20187001006.

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Modern marine diesel engines are characterized by ~50% conversion of chemical energy of fuel into useful work. The remaining amount of heat is lost to the environment as the so-called waste heat, whereby its part can be used in various marine heating installations. In the ship's engine the biggest source of waste heat, potentially useful for further use, both due to the amount of available energy and its quality, are exhaust emissions from the main engine. Taking into account the need for rational energy management, the paper presents a preliminary analysis and assessment of the possibility of using the heat of hot exhaust gases to generate electricity in the so-called low-temperature ORC installation. Based on the available data, the operation of ORC installation has been evaluated, taking into account the influence of engine operating parameters on the obtained electrical power and the cycle efficiency. The aim of the analysis was to demonstrate that there is a real possibility to use the waste heat from marine engine exhausts to drive the ORC and generate electricity.

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Singh, Parminder, SidhNath Singh, and V. Seshadri. "Studies on Stepped Air Ejector Diffusers incorporating Heat Transfer Effects." International Journal of Turbo & Jet-Engines 35, no. 3 (July 26, 2018): 251–63. http://dx.doi.org/10.1515/tjj-2016-0048.

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Abstract Air ejector diffusers are employed in gas turbine exhaust systems to cool the exhaust gases. These diffusers are developed as passive devices, which use the energy of the main flow to entrain the relatively cool ambient air through the annular slot openings. Multiple slot openings are provided along the length of ejector diffusers to lower the temperatures of the exhaust gases. This paper presents results of a 3-D numerical study carried out at a fixed Reynolds Number of 2.5×105 with a corresponding inlet Mach number of about 0.22 on three configurations of a non-circular ejector diffuser having an overall area ratio of 9. The three configurations being investigated are the best diffuser configurations established on the basis of cold flow studies reported in literature. The results are presented in terms of temperature distribution, entrainment mass flux rates and static pressure recovery. The results show that the higher number of slot openings improves cooling in the ejector diffuser as compared to thicker interfaces or inclination at the slot inlet.

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Klimov, R., and V. Kirilyuk. "EFFICIENCY OF THE NOZZLES OF CONTACT HEAT EXCHANGERS." Collection of scholarly papers of Dniprovsk State Technical University (Technical Sciences) 1, no. 38 (September 8, 2021): 92–98. http://dx.doi.org/10.31319/2519-2884.38.2021.11.

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Анотація:

At powerful thermal power plants or boiler houses, the efficiency depends to the greatest extent on the amount of heat lost with the cooling of turbine condensers, exhaust gases that have a high temperature. Each type of such losses is a large unused energy potential, that is, a secondary energy resource that can be used. At the same time, the use of secondary resources and industrial emissions will improve the ecological situation in the regions, and this has always been an urgent task. As a rule, large losses of thermal secondary energy resources in boilers are reduced by installing economizers and air heaters. Contact types of heat exchangers are distinguished by the best efficiency in operation. In contact economizers, to increase the surface of heat and mass transfer, it is advisable to use various types of nozzles. The aim of the study is to develop such an indicator, with which it is possible to determine the optimal type of nozzle of the contact economizer installed after the steam boiler. This indicator should show the highest heat engineering efficiency of the packing with a small hydraulic resistance of the heat exchanger. By using the coefficient of specific energy efficiency of the packing in the heat exchanger of waste gases of heating equipment, it is possible to analyze the work of the packing space from the standpoint of thermal and hydraulic efficiency and select the optimal type of packing for each individual unit or installation. Geometric parameters determine the required volume of the apparatus and the hydraulic resistance of the exhaust gases movement. The hydraulic resistance affects the consumption of electrical energy for the drive of smoke exhausters for sucking off exhaust gases from heat engineering installations through the free section of the heat exchanger. Taking into account the developed indicator of the specific energy efficiency in waste heat utilizers, it is possible to select such a type of packing, at which the optimal level of waste heat utilization will be achieved.

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Nassiri, Toosi, Amir Kakaee, and Hazhir Ebne-Abbasi. "Exhaust gas heat recovery through secondary expansion cylinder and water injection in an internal combustion engine." Thermal Science 21, no. 1 Part B (2017): 729–43. http://dx.doi.org/10.2298/tsci150915282n.

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To enhance thermal efficiency and increase performance of an internal combustion engine, a novel concept of coupling a conventional engine with a secondary 4-stroke cylinder and direct water injection process is proposed. The burned gases after working in a traditional 4-stroke combustion cylinder are transferred to a secondary cylinder and expanded even more. After re-compression of the exhaust gases, pre-heated water is injected at top dead center. The evaporation of injected water not only recovers heat from exhaust gases, but also increases the mass of working gas inside the cylinder, therefore improves the overall thermal efficiency. A 0-D/1-D model is used to numerically simulate the idea. The simulations outputs showed that the bottoming cycle will be more efficient at higher engines speeds, specifically in a supercharged/turbocharged engine, which have higher exhaust gas pressure that can reproduce more positive work. In the modeled supercharged engine, results showed that brake thermal efficiency can be improved by about 17%, and brake power by about 17.4%.

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Burlacu, Andrei, Constantin Doru Lazarescu, Adrian Alexandru Serbanoiu, Marinela Barbuta, Vasilica Ciocan, and Marina Verdes. "ENERGY EFFICIENT PIPE HEAT EXCHANGER FOR WASTE HEAT RECOVERY FROM EXHAUST FLUE GASES." Environmental Engineering and Management Journal 16, no. 5 (2017): 1107–13. http://dx.doi.org/10.30638/eemj.2017.114.

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Karev, Alexey N., and Mikhail P. Tyurin. "The effectiveness of the scrubber method of cleaning exhaust gases in industry." RUDN Journal of Ecology and Life Safety 29, no. 4 (December 30, 2021): 371–80. http://dx.doi.org/10.22363/2313-2310-2021-29-4-371-380.

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Анотація:

Unfortunately, not all types of industry have a positive impact on the environment and people, for example, the processes of the chemical and textile industries can be accompanied by the release of toxic and harmful gases, dust and steam. And already, along with the exhaust gases, they are released into the atmosphere, while the negative impact on the overall environmental situation only doubles. That is why the importance of cleaning the emitted gases in the process of industrial activity cannot be underestimated. The most popular and most effective method of cleaning from dust emissions can be designated as the scrubber method of air purification, precisely at the moment when the air being eliminated has a relatively high temperature level. In addition, the use of the heat of condensation of water vapors contained in them is a particularly effective direction for increasing the depth of heat recovery of wet gas and steam generator gases leaving heat technology devices. This article is devoted to the study of the stages and models of the process of designing and constructing a device for wet cleaning of gases that are released into the atmosphere as a result of certain production activities. The study of the systems of utilization of secondary energy resources used at the present time was also carried out.

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Karev, Alexey N., and Mikhail P. Tyurin. "The effectiveness of the scrubber method of cleaning exhaust gases in industry." RUDN Journal of Ecology and Life Safety 29, no. 4 (December 30, 2021): 371–80. http://dx.doi.org/10.22363/2313-2310-2021-29-4-371-380.

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Анотація:

Unfortunately, not all types of industry have a positive impact on the environment and people, for example, the processes of the chemical and textile industries can be accompanied by the release of toxic and harmful gases, dust and steam. And already, along with the exhaust gases, they are released into the atmosphere, while the negative impact on the overall environmental situation only doubles. That is why the importance of cleaning the emitted gases in the process of industrial activity cannot be underestimated. The most popular and most effective method of cleaning from dust emissions can be designated as the scrubber method of air purification, precisely at the moment when the air being eliminated has a relatively high temperature level. In addition, the use of the heat of condensation of water vapors contained in them is a particularly effective direction for increasing the depth of heat recovery of wet gas and steam generator gases leaving heat technology devices. This article is devoted to the study of the stages and models of the process of designing and constructing a device for wet cleaning of gases that are released into the atmosphere as a result of certain production activities. The study of the systems of utilization of secondary energy resources used at the present time was also carried out.

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45

Fomin, V. M., and D. V. Apelinskiy. "Improvement of energy efficiency of alternative fuels." Traktory i sel hozmashiny 82, no. 7 (July 15, 2015): 15–19. http://dx.doi.org/10.17816/0321-4443-66024.

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46

Zamaleev, M. M., V. N. Kovalnogov, R. I. Kamalova, and O. V. Pazushkina. "Development of water deaeration technologies with boiler exhaust gases." Journal of Physics: Conference Series 2039, no. 1 (October 1, 2021): 012036. http://dx.doi.org/10.1088/1742-6596/2039/1/012036.

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Abstract The calculation of the heat and mass transfer efficiency of the proposed technology for deaeration of water by the exhaust gases of a gas-proof boiler in deaerators of serial design has been performed. The conditions and criterial values of the media consumption in the apparatus have been studied. It is shown that the technology can be successfully applied in operating thermal power plants.

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47

Konovalov, Dmytro, Roman Radchenko, Halina Kobalava, Anatolii Zubarev, Vyacheslav Sviridov, and Victoria Kornienko. "Analysing the efficiency of thermopressor application in the charge air cooling system of combustion engine." E3S Web of Conferences 323 (2021): 00017. http://dx.doi.org/10.1051/e3sconf/202132300017.

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As the analysis of the research results has shown, the use of a thermopressor makes it possible to increase the fuel and energy efficiency of a ship power plant in a wide range of the operation parameters. It can be achieved by cooling the charge air before the engine inlet receiver and by reducing the compression work of the turbocharger. A scheme with the thermopressor application in the cooling system of a low-speed main engine and in the system for utilizing the exhaust gases heat in a heat recovery boiler of one and two pressures was proposed. The use of thermopressors led to a decrease in the compressor power consumption, and therefore in the turbine required power. Therefore, it was appropriate to pass (bypass) the excess amount of gas past the turbine. Accordingly, the thermal potential of exhaust gases was increased. As a result, the temperature of gases at the inlet to the heat recovery boiler was increased by 10-15 °C, and gases heat was increased by 10-15% respectively. The obtained additional steam is advisable to use for driving the utilization turbine generator, thereby reducing the load on the ship's power plant, with a corresponding decrease in fuel consumption of diesel generators by 2-4%.

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48

Горожанкин, S. Gorozhankin, Чухаркин, and A. Chukharkin. "UTILIZATION OF GAS TURBINE POWER PLANT’S EXHAUST GASES BY STIRLING ENGINE." Alternative energy sources in the transport-technological complex: problems and prospects of rational use of 2, no. 1 (April 27, 2015): 27–32. http://dx.doi.org/10.12737/13833.

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The article researches a feasibility of real cycles of combined power plants including gas turbine engines and Stirling engines. The variant of construction concepts of such power plants has been considered. The analysis of thermodynamic cycles has been performed, the dependences to calculate their basic parameters has been founded. Based on the research results quantify the heat utilization degree of the combustion products of a gas turbine engine for the Stirling engine has been given. Stirling engine’s efficiency, power and combined power plant’s efficiency in general has been identified. The heat exchanger’s type and heat transfer agent has been proposed, the optimal parameters by conditions of maximum efficiency of the plant has been identified. Proposals for the application and the empowerment of such power plants as part of the vehicles has been offered.

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49

Levtsev, A. P., and A. V. Yenivatov. "Autonomous power-supply source on diesel-generator base." Traktory i sel hozmashiny 80, no. 9 (September 15, 2013): 8–10. http://dx.doi.org/10.17816/0321-4443-65693.

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It is proposed to use diesel-generator as autonomous power-supply sources (APS) at the expense of complete utilization of exhaust gases (EG) heat and heat extraction from heat engine cooling jacket. Functional diagram of APS with complete heat utilization, as well as results of comparable tests of APS operation in common and impulse modes are given.

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50

Agrebi, Senda, Louis Dreßler, and Kaushal Nishad. "The Exergy Losses Analysis in Adiabatic Combustion Systems including the Exhaust Gas Exergy." Entropy 24, no. 4 (April 18, 2022): 564. http://dx.doi.org/10.3390/e24040564.

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The entropy generation analysis of adiabatic combustion systems was performed to quantify the exergy losses which are mainly the exergy destroyed during combustion inside the chamber and in the exhaust gases. The purpose of the present work was therefore: (a) to extend the exergy destruction analysis by including the exhaust gas exergy while applying the hybrid filtered Eulerian stochastic field (ESF) method coupled with the FGM chemistry tabulation strategy; (b) to introduce a novel method for evaluating the exergy content of exhaust gases; and (c) to highlight a link between exhaust gas exergy and combustion emissions. In this work, the adiabatic Sandia flames E and F were chosen as application combustion systems. First, the numerical results of the flow and scalar fields were validated by comparison with the experimental data. The under-utilization of eight stochastic fields (SFs), the flow field results and the associated scalar fields for the flame E show excellent agreement contrary to flame F. Then, the different exergy losses were calculated and analyzed. The heat transfer and chemical reaction are the main factors responsible for the exergy destruction during combustion. The chemical exergy of the exhaust gases shows a strong relation between the exergy losses and combustion emission as well as the gas exhaust temperature.

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