Articles de revues : « Boiler efficiency characterization »

1

Barcelos, Sheyla Thays Vieira, Ismael Plácido Tomielis, Marli Da Silva Garcia et Marney Pascoli Cereda. « Characterization of boiler ashes from sugarcane mill ». Revista Ibero-Americana de Ciências Ambientais 10, n^o 3 (17 juillet 2019) : 179–90. http://dx.doi.org/10.6008/cbpc2179-6858.2019.003.0016.

Texte intégral

Résumé :

Sugarcane mills produce sugar and ethanol and have always used bagasse as fuel to generate energy for self-consumption. Recently some mills have been also producing surplus electricity to sell in the market a third product from sugarcane. Although any boiler can be efficient, the sale of electricity has stimulated the improvement of the burning process. However, the investment in high-pressure boilers, much more expensive than any common boiler, is essential for the exportation of electricity. Among the 22 sugarcane mills from Mato Grosso do Sul, Brazil, only 12 power plants sell electricity to the grid. The power generation efficiency depends on the pyrolysis in boilers, which results in ashes that match the unburned mineral fraction of the fuel as oxide. Both the bagasse and the straw are composed predominantly of lignin, hemicellulose and cellulose with calorific power near to the wood at the same moisture content. However the bagasse leaves the mill with about 50% of moisture while the straw reaches the industry with about 15% of humidity. This paper characterize the ashes samples from burned bagasse from seven sugarcane mills at Mato Grosso do Sul Brazilian state, to compare the methodology available for use to measure the efficiency of the pyrolysis system. Among these sugarcane mills only two are highlighted by their higher burning efficiency, both of them selling electricity, while the others showed unburned portions characterizing an inefficient system. For these industries the ash content in the ashes showed values compatible with the Superior Calorific Value as an efficiency index for the combustion degree in boilers.

Styles APA, Harvard, Vancouver, ISO, etc.

2

Mameri, Fateh, Eric Delacourt, Céline Morin et Jesse Schiffler. « 0D Dynamic Modeling and Experimental Characterization of a Biomass Boiler with Mass and Energy Balance ». Entropy 24, n^o 2 (28 janvier 2022) : 202. http://dx.doi.org/10.3390/e24020202.

Texte intégral

Résumé :

The paper presents an experimental study and a 0D dynamic modeling of a biomass boiler based on the Bond Graph formalism from mass and energy balance. The biomass boiler investigated in this study is an automatic pellet boiler with a nominal power of 30 kW with a fixed bed. The balances allow to model as time function the flue gas enthalpy flux variation and the thermal transfers between the flue gas and the walls of the boiler subsystems. The main objective is to build a model to represent the dynamic thermal behavior of the boiler. Indeed, small domestic boilers have discontinuous operating phases when the set temperature is reached. The global thermal transfer coefficients for the boiler subsystems are obtained according to an iterative calculation by inverse method. The boiler has an average efficiency of 67.5% under our operating conditions and the radiation is the dominant thermal transfer by reaching 97.6% of the total thermal transfers inside the combustion chamber. The understanding of the dynamic behavior of the boiler during the operating phases allows to evaluate its energy performances. The proposed model is both stimulated and validated using experimental results carried out on the boiler.

Styles APA, Harvard, Vancouver, ISO, etc.

3

Chandrasekaran, Sriraam R., Philip K. Hopke, Michael Newtown et Arthur Hurlbut. « Residential-Scale Biomass Boiler Emissions and Efficiency Characterization for Several Fuels ». Energy & ; Fuels 27, n^o 8 (6 août 2013) : 4840–49. http://dx.doi.org/10.1021/ef400891r.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

4

Li, Jin Ping, Jin Hua Gan et Ying Ming Chen. « Preparation of a Sulfate-Based Complex Coagulant from Boiler Slag and its Application in Domestic Sewage Treatment ». Advanced Materials Research 148-149 (octobre 2010) : 259–66. http://dx.doi.org/10.4028/www.scientific.net/amr.148-149.259.

Texte intégral

Résumé :

This paper presents a new way of recycling aluminum and iron in boiler slag derived from coal combustion plants for the production of a sulfate-based complex coagulant containing ferric sulfate and aluminum sulfate. The boiler slag sample was determined for more complete characterization by means of scanning electron microscopy(SEM), X-ray diffraction(XRD), X-ray fluorescence(XRF) and other techniques. An analysis for the boiler slag sample collected from Baotou Steel Plant located in Inner Mongolia, PR China showed that the quantity of iron and aluminum oxides, in general, accounted for about 35% of the boiler slag. XRD analysis indicates that predominate minerals such as kaolinite, quartz, calcium silicide, hematate and metakoalin exist in this boiler slag. This boiler salg was evaluated to determine the efficiency of converting the iron and aluminum components of the material into a sulfate-based complex coagulant when heated with sulfuric acid at different temperatures and reaction times. The maximum concentrations of Fe3+ and Al3+ in the complex coagulant prepared from the boiler slag were obtained at 130 and after 3 h of reaction time. These concentrations were 0.04 M Fe3+ and 0.46 M Al3+, respectively. The corresponding conversion efficiencies of aluminum and iron were 66.2 and 95.0% in the boiler slag, respectively. Finally, the prepared sulfate-based complex coagulant proved to be an effective agent for reducing the turbidity and chemical oxygen demand(COD) of a typical domestic sewage sample.

Styles APA, Harvard, Vancouver, ISO, etc.

5

Peta, Sandile, Chris du Toit, Reshendren Naidoo, Walter Schmitz et Louis Jestin. « Investigations of operation problems at a 200 MWe PF boiler ». Chemical and Process Engineering 36, n^o 3 (1 septembre 2015) : 305–20. http://dx.doi.org/10.1515/cpe-2015-0021.

Texte intégral

Résumé :

Abstract To minimize oxides of nitrogen (NOx) emission, maximize boiler combustion efficiency, achieve safe and reliable burner combustion, it is crucial to master global boiler and at-the-burner control of fuel and air flows. Non-uniform pulverized fuel (PF) and air flows to burners reduce flame stability and pose risk to boiler safety by risk of reverse flue gas and fuel flow into burners. This paper presents integrated techniques implemented at pilot ESKOM power plants for the determination of global boiler air/flue gas distribution, wind-box air distribution and measures for making uniform the flow being delivered to burners within a wind-box system. This is achieved by Process Flow Modelling, at-the-burner static pressure measurements and CFD characterization. Global boiler mass and energy balances combined with validated site measurements are used in an integrated approach to calculate the total (stoichiometric + excess) air mass flow rate required to burn the coal quality being fired, determine the actual quantity of air that flows through the burners and the furnace ingress air. CFD analysis and use of at-the-burner static, total pressure and temperature measurements are utilized in a 2-pronged approach to determine root-causes for burner fires and to evaluate secondary air distribution between burners.

Styles APA, Harvard, Vancouver, ISO, etc.

6

Hansted, Ana Larissa Santiago, Felipe Augusto Santiago Hansted, João Otávio Poletto Tomeleri, Thiago Aguiar Cacuro, Carlos Roberto Sette Jr., Fábio Minoru Yamaji et Vladimir Eliodoro Costa. « Biomass in an industrial boiler : characterizing and reducing waste from the burning process ». Research, Society and Development 11, n^o 9 (15 juillet 2022) : e45511931948. http://dx.doi.org/10.33448/rsd-v11i9.31948.

Texte intégral

Résumé :

Ashes constitute a waste produced in the heat generation process from bioenergy. This study aimed to improve the biomass energy efficiency used in an industrial boiler. The physicochemical analysis was used to perform improvement in the quality of the biomass for solid fuel. Four biomass types (eucalyptus bark, wood chips, sawdust, and recycled wood waste) were analyzed. The material (ash) was collected every two months over one year. All samples were characterized regarding proximate analysis, chemical composition (macro and micronutrients), morphological characterization (via scanning electron microscopy [SEM] coupled with dispersive energy spectroscopy [EDS]), and particle size distribution. The four biomass types presented significant differences in moisture content and proximate analysis. The bark showed a high percentage of impurities with an ash content of 26.99%. It was possible to reduce the ash content of the biomass inserted into the boiler in half, by separating the bark in the granulometric strata and excluding the smallest particle size (<0.84 mm). The results regarding the ashes showed that chemical composition and physical attributes were similar in all samples over the year. The chemical components were the same, although they varied in quantity. It is possible to improve the biomass energetic performance by excluding the smallest particles prior to the boiler insertion.

Styles APA, Harvard, Vancouver, ISO, etc.

7

A. M., Kola. « EVALUATION OF WASTE MANAGEMENT SYSTEMS IN A KENYAN TEA FACTORY : A CASE STUDY OF MARAMBA TEA FACTORY IN KIAMBU COUNTY ». Journal of Engineering in Agriculture and the Environment 6, n^o 1 (30 juin 2020) : 31. http://dx.doi.org/10.37017/jeae.v6i1.65.

Texte intégral

Résumé :

This paper evaluates the effectiveness of waste management systems in Maramba Tea Factory in Kiambu County, Kenya. Performance of the already existing systems is therefore critical in sustaining our environment. Tea processing generates different types of wastes. A waste management system design should at least begin from a clear characterization of these wastes, the quantities and qualities of the wastes and identification of sources. This study attempted to bring these challenges to the fore. It evaluated the waste management systems for Maramba Tea factory in Kiambu County, Kenya. Primary data and secondary data, Purposively and Convenience sampling techniques, Benchmarking evaluation technique were utilised. The types of wastes identified were organic solid wastes, inorganic solid wastes, Liquid wastes and Thermal wastes. The quantities of wastes were determined by weighing. The Organic solid wastes from tea processing stages was 486.47 kilograms per month and inorganic solid wastes (sacks and polythene bags) was 15.38 kilograms per month. The amount of liquid wastes generated for the study period were estimated. The highest with major cleaning done weekly averaged of 139.4m3 and least with minor cleaning done daily averaged at 52.8m3. The thermal wastes generated was due to heat loss from the wood fuel used as a source of energy. The total amount of heat loss was 1145.51kcal/kg representing 37.45%. of the Gross Calorific Value (GCV) of wood fuel. The highest heat loss was due to dry flue gas with a 22.09% of GCV of wood fuel representing 675.85kcal/kg and the least due to moisture present in the combustion air at 24.78kcal/kg representing 0.810 % of the total GCV of wood fuel. The qualities of wastewater were achieved through analysing the BOD5, COD, pH and Electrical conductivity and comparing the values to the standards recommended by National Environment Management Authority (NEMA). The BOD5 at 83.7mg/L and COD at 106.63mg/L exceeded the NEMA limits of 30mg/L and 50mg/L respectively. The thermal waste systems were evaluated by determining the boiler efficiency. Boiler efficiency at Maramba Tea Factory was 62.55%. The boiler efficiency of 62.55% is lower compared to the set values of 75.01% and 75%. The analysis with ANOVA showed significant differences in the water parameter values from source through the lagoon to the river. The coefficient of determination (R2) for most of the parameter analysed were above 97%. It was concluded that the waste management systems are only partially effective at Maramba Tea Factory. More targeted studies need to be carried out in other food industries to make a general conclusion on the state of waste management systems in Kenya.

Styles APA, Harvard, Vancouver, ISO, etc.

8

Pavan, A. H. V., R. Ravibharath et Kulvir Singh. « Creep-Rupture Behavior of SUS 304H – IN 617 Dissimilar Metal Welds for AUSC Boiler Applications ». Materials Science Forum 830-831 (septembre 2015) : 199–202. http://dx.doi.org/10.4028/www.scientific.net/msf.830-831.199.

Texte intégral

Résumé :

Advanced Ultra Super-Critical (AUSC) power plants are envisaged for achieving higher thermodynamic efficiency by operating at temperatures and pressures of 710/720 °C and 310 ata, respectively which are significantly higher than sub-critical (conventional) and supercritical power plants. This has led to tremendous research in selection of new and advanced materials to meet high temperature requirements. Ni-base superalloys having known to have excellent creep-rupture behavior were selected for high temperature sections of boiler while austenitic stainless steels were selected for moderately high temperature sections considering the economical feasibility. Since both these materials have to be fabricated for application in boiler tubes, dissimilar metal welding is inevitable. This work discusses creep-rupture evaluation of one such case of dissimilar welds, i.e., between Inconel 617 (IN 617) and SUS 304H. IN 617 is a Ni-base superalloy while SUS 304H is a Cu-precipitated austenitic stainless steel. Welding was carried out using IN 617 filler material for producing defect free welds. Creep-rupture samples were prepared incorporating the complete cross-weldment for understanding mechanical behavior as a result of prolonged exposure to elevated temperature and stresses. Creep-rupture testing was carried out at 600, 650 and 700°C at suitable stresses to obtain rupture times in the excess of 3000 hours in a few test conditions. Detailed characterization studies when carried out on ruptured samples revealed the weakest zone to be heat affected zone towards SUS 304H which led to failure. This work also provides insight into the possible creep-mechanisms that operate in various zones of weldments. Phases formed as a result of exposure to stress and temperature for a prolonged duration are also discussed. Comparison of the data obtained with data available in literature was carried out and performance of weldments was analyzed and reported.

Styles APA, Harvard, Vancouver, ISO, etc.

9

Lv, Qiang, Chang’an Wang, Yang He, Ming Cai et Defu Che. « Elemental Mercury Removal over CeO2/TiO2 Catalyst Prepared by Sol–Gel Method ». Applied Sciences 10, n^o 8 (14 avril 2020) : 2706. http://dx.doi.org/10.3390/app10082706.

Texte intégral

Résumé :

Elemental mercury (Hg0) emitted from a coal-fired boiler is a serious menace and challenge to humans. Using high-efficiency CeO2/TiO2 catalysts to enhance the conversion from elemental mercury to oxidized mercury is a promising approach to reducing Hg0 emission. However, most of the CeO2/TiO2 catalysts were prepared by impregnation method or coprecipitation method while little attention has been paid to sol–gel method, which has many advantages in material production. In this study, a series of catalysts were synthesized through the sol–gel method to remove the gaseous Hg0 from simulated flue gas. The effect of vanadium (V) on Hg0 removal efficiency and the simultaneous removal of Hg0 and NO were also investigated. The results showed the optimal temperature for Hg0 removal over the CeO2/TiO2 catalysts was 350 °C. The oxidation of Hg0 could be promoted by O2, HCl, and NO, but inhibited by NH3 and SO2. The addition of vanadium could enhance the Hg0 removal performance and the resistance to NH3 and SO2. A synergetic effect was found during the simultaneous removal of Hg0 and NO. The high redox reaction reactivity of Ce4+/Ce3+ and V5+/V4+ should take the credit for the oxidation of Hg0 and the removal of NO. Based upon the performance tests and the characterization experiments of the samples, the detailed mechanisms of the Hg0 and NO removal over the catalysts were proposed.

Styles APA, Harvard, Vancouver, ISO, etc.

10

Chandrasekaran, Sriraam R., James R. Laing, Thomas M. Holsen, Suresh Raja et Philip K. Hopke. « Emission Characterization and Efficiency Measurements of High-Efficiency Wood Boilers ». Energy & ; Fuels 25, n^o 11 (17 novembre 2011) : 5015–21. http://dx.doi.org/10.1021/ef2012563.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

11

C. Nwosu, Vitalis, B. C. Anusionwu, T. C. Chineke, I. M. Mejeha et K. B. Okeoma. « DESIGN, FABRICATION AND CHARACTERIZATION OF AN AUTOMATED INCLINED BOX-TYPE SOLAR COOKER EMPLOYING TRACKING REFLECTORS ». JOURNAL OF ADVANCES IN PHYSICS 5, n^o 1 (2 août 2014) : 726–36. http://dx.doi.org/10.24297/jap.v5i1.1971.

Texte intégral

Résumé :

An inclined box-type solar cooker employing tracking reflectors with dimensions 700mm x 440mm x 280mm, has been successfully designed and fabricated. The detachable reflectors, which were mounted on the box cooker, were suitably positioned in an east-west configuration on an inclined framework. This automatically tracks the apparent motion of the sun within 15 minutes time interval so as to align with the earthâ€™s rotation when displayed under the sun. Thermal performance of the inclined box-type solar cooker has also been compared with that of a conventional box-type solar cooker whose dimensions and make are identical to the inclined box cooker. Testing of the tracking box type solar cooker has been carried out with load and without load conditions at Federal University of Technology Owerri, Imo State, located at Latitude 5oN, Longitude 7oE, Altitude 156m (Altitude 511ft) and 12km south of Owerri capital territory. Experimental results obtained from the field test show that the inclined box-type solar cooker with tracking reflectors attained temperature of 94oC, with efficiency of 93% and boiled water for 1hour 28 minutes. The conventional box-type solar cooker attained a temperature of 91oC, with efficiency of 90.9% and boiled water for 1hour 36 minutes. The tracking box cooker was found to be more efficient and effective than the conventional box cooker. Meteorological variables like Air Temperature, Irradiance, Relative Humidity and Wind speed were also obtained to investigate their effects on the performance of the box cookers.

Styles APA, Harvard, Vancouver, ISO, etc.

12

Chidiac, S. E., E. J. C. Catania, H. L. Perry, E. Morofsky et S. Foo. « Computational tools for selecting energy conservation measures for retrofitting existing office buildings ». Canadian Journal of Civil Engineering 40, n^o 5 (mai 2013) : 445–59. http://dx.doi.org/10.1139/l2012-037.

Texte intégral

Résumé :

Existing buildings consume most of our non-transportation related energy and are a major contributor to the emission of greenhouse gases. Improving their energy efficiency by applying energy conservation measures (ECMs) remains a major challenge. This paper presents computational tools developed to screen office buildings for retrofit and to select specific ECMs for each building. This selection process accounts for climate, occupancy, building operation, heating and cooling systems, distribution systems, envelope properties, building geometry, and cost of ECMs. The tools screen the complete building set for optimal retrofit opportunities. The methodology adopted in developing the computational tools includes characterization of the office building stock into a manageable set of archetypes; simulation of building operation using specific occupancy characteristics and local climate data; development of energy prediction models for lights, equipment, pumps, fans, domestic hot water, chillers, and boilers; and application of present value analysis to evaluate the cost effectiveness of ECMs.

Styles APA, Harvard, Vancouver, ISO, etc.

13

Cavalaglio, Gianluca, Franco Cotana, Andrea Nicolini, Valentina Coccia, Alessandro Petrozzi, Alessandro Formica et Alessandro Bertini. « Characterization of Various Biomass Feedstock Suitable for Small-Scale Energy Plants as Preliminary Activity of Biocheaper Project ». Sustainability 12, n^o 16 (18 août 2020) : 6678. http://dx.doi.org/10.3390/su12166678.

Texte intégral

Résumé :

The PRIN (Research Project with Relevant National Interest) project “Biocheaper—biomasses circular holistic economy approach to energy equipments” started in September 2019 and involves several universities: Palermo as the university coordinator, Perugia, Cassino, Enna, Pavia and Bolzano. The main goal of the project is to increase the energy efficiency and reduce the pollutants emissions in small-scale biomass plant for energy (heat and power) production. The project focuses on residual lignocellulosic feedstocks from the agriculture and forestry sector, from energy crops in marginal lands and residues from rivers maintenance. Starting from the selection and characterization of potential feedstocks, the project aims at developing some prototypes for retrofit applications in existing biomass boilers, like a mini-cyclone for the reduction of particulate emissions and an exhaust air-water condensing system for the recovery of water and the reuse in agriculture. This work presents the first results of the project, in particular regarding the selection and the chemical–physical characterization of different biomass, available in different zones of Italy; in particular the authors investigated cardoon chips, carthamus chips, olive and wine pruning, residues from rivers maintenance. Each biomass sample was characterized in terms of moisture content, ashes content, volatile substances, fixed carbon, low and high heating value, content of carbon, nitrogen, hydrogen and main metals.

Styles APA, Harvard, Vancouver, ISO, etc.

14

Jensen, Adam, et Ioannis Sifnaios. « Modeling, Validation, and Analysis of a Concentrating Solar Collector Field Integrated with a District Heating Network ». Solar 2, n^o 2 (3 mai 2022) : 234–50. http://dx.doi.org/10.3390/solar2020013.

Texte intégral

Résumé :

In recent years, concentrating solar collectors have been integrated with several district heating systems with the aim of taking advantage of their low heat losses. The present study investigates the Brønderslev combined heat and power plant, which consists of a 16.6 MW parabolic trough collector field, two biomass boilers, and an organic Rankine cycle system. The study focuses on the solar collector field performance and integration with the district heating network. An in situ characterization of the parabolic solar collector field using the quasi-dynamic test method found that the field had a peak efficiency of 72.7%. Furthermore, a control strategy for supplying a constant outlet temperature to the district heating network was presented and implemented in a TRNSYS simulation model of the solar collector field. The developed simulation model was validated by comparison to measurement data. Subsequently, the simulation model was used to conduct a sensitivity analysis of the influence of the collector row spacing and tracking axis orientation. The results showed that the current suboptimal tracking axis rotation, made necessary by the geography of the location, only reduced the annual power output by 1% compared to the optimal configuration. Additionally, there were only minor improvements in the annual heat output when the row spacing was increased past 15 m (ground cover ratio of 0.38).

Styles APA, Harvard, Vancouver, ISO, etc.

15

Levytska, Olena Hryhoriivna, Yulia Vladimirovna Voytenko et Anastasiia Oleksiivna Orishechok. « COMPARATIVE ASSESSMENT OF GASEOUS FUEL EMISSION ». Bulletin of the National Technical University "KhPI". Series : Chemistry, Chemical Technology and Ecology, n^o 1(5) (15 mai 2021) : 83–91. http://dx.doi.org/10.20998/2079-0821.2021.01.13.

Texte intégral

Résumé :

The work presents estimated comparative assessment of emissions release in combustion products during work of high–power steam boilers with the use of traditional fuel – natural gas and alternative fuels – blast–furnace and coke–oven gases generated in the process of technological cycle at iron and steel and coke–chemical enterprises. Calculation algorithm is shown and formulas for assessment of carbon content in exhaust gases are defined, conclusions on ecological efficiency of gaseous fuels are given. The purpose of the work was to evaluate the emissions of harmful substances generated during the combustion of natural, blast furnace and coke oven gases, justification of the calculation of carbon content of a given chemical composition and determine the optimal environmental impact of analogues of natural gas. The comparative estimation of pollutant emissions into atmospheric air during combustion of natural, coke oven and blast furnace gases revealed: – high sulfur dioxide emissions from combustion of blast furnace and coke oven gases due to the presence of sulfur compounds in the composition of these gases; – relatively high emissions of nitrogen compounds for natural and coke oven gases and relatively low emissions for blast furnace gas; – сarbon emissions are high for all types of fuels which have been considered, most carbon dioxide gets into the air when burning natural gas, least – when burning blast furnace gas; – significantly higher methane emissions are observed during the combustion of natural and coke oven gases, respectively, smaller – for blast–furnace gas combustion; – coke oven and natural gases are characterized by low mercury emissions. Comparative assessment of the calculated values of hazardous substances emissions in the combustion products in the process of combustion of natural, coke–oven and blast–furnace gases shows that even at lower working heat of combustion values the coke–oven and blast–furnace gases can compete with natural gas. For the first time, a comparative characterization of the emissions of harmful substances in the combustion of natural, coke oven and blast furnace gases is presented, and it is shown that the gases used in coke and metallurgical industries, which are used as analogues of natural, are logical to use, but require the installation of treatment systems. The paper defines a formula for calculating the carbon content in natural gas from the Urengoy–Uzhhorod gas pipeline. The provided calculations and the introduction of simplified formulas serve as an example for the calculation of emission factors and emissions in assessing the level of safety of existing equipment and can be used in the development of permit documents of enterprises that carry out emissions of harmful substances to the environment.

Styles APA, Harvard, Vancouver, ISO, etc.

16

Akbar, Said Ali. « Sensor Gas Amonia Berbasis Polimer Konduktif Polianilina : Sebuah Review ». QUIMICA : Jurnal Kimia Sains dan Terapan 3, n^o 2 (2 février 2022) : 1–8. http://dx.doi.org/10.33059/jq.v3i2.4678.

Texte intégral

Résumé :

Artikel review ini memberikan informasi tentang aplikasi polianilina (PANI) dan kompositnya sebagai sensor gas berbahaya khususnya amonia (NH3). Kajian yang dibahas pada artikel ini meliputi sifat gas NH3, material komposit, kinerja sensor, serta limit deteksi. Tinjauan sensor gas amonia berbasis polimer konduktif polianilina secara menyeluruh diambil dari referensi sepuluh tahun terakhir. Sebagai contoh, komposit polianilina dengan turunan karbon seperti reduced Graphene Oxide (rGO) dan Carbon Nanotube menunjukkan limit deteksi hingga 46 ppb dengan waktu pemulihan hanya 75 detik. Selain itu, komposit PANI dengan logam seperti Ag, Sr dan sebagainya, menunjukkan limit deteksi yang lebih besar yaitu 1 ppm, namun terdapat keunggulan dimana waktu pemulihan hanya 4 deti. Oleh sebab itu, polimer konduktif polianilina menjadi material yang sangat menjanjikan untuk mendeteksi keberadaan gas NH3. Terakhir, mekanisme penginderaan gas amonia terhadap material PANI juga dibahas pada tulisan ini. Referensi: [1] M. Insausti, R. Timmis, R. Kinnersley, and M. C. Rufino, “Advances in sensing ammonia from agricultural sources,” Science of the Total Environment, vol. 706. 2020. doi: 10.1016/j.scitotenv.2019.135124. [2] H. Shen et al., “Intense Warming Will Significantly Increase Cropland Ammonia Volatilization Threatening Food Security and Ecosystem Health,” One Earth, vol. 3, no. 1, 2020, doi: 10.1016/j.oneear.2020.06.015. [3] W. Wu, B. Wei, G. Li, L. Chen, J. Wang, and J. Ma, “Study on ammonia gas high temperature corrosion coupled erosion wear characteristics of circulating fluidized bed boiler,” Engineering Failure Analysis, vol. 132, p. 105896, 2022, doi: https://doi.org/10.1016/j.engfailanal.2021.105896. [4] X. Huang et al., “Reduced graphene oxide–polyaniline hybrid: Preparation, characterization and its applications for ammonia gas sensing,” Journal of Materials Chemistry, vol. 22, no. 42, pp. 22488–22495, 2012, doi: 10.1039/C2JM34340A. [5] T. Jiang, P. Wan, Z. Ren, and S. Yan, “Anisotropic Polyaniline/SWCNT Composite Films Prepared by in Situ Electropolymerization on Highly Oriented Polyethylene for High-Efficiency Ammonia Sensor,” ACS Applied Materials & Interfaces, vol. 11, no. 41, pp. 38169–38176, Oct. 2019, doi: 10.1021/acsami.9b13336. [6] H. Bai and G. Shi, “Gas sensors based on conducting polymers,” Sensors, vol. 7, no. 3. 2007. doi: 10.3390/s7030267. [7] D. Kwak, Y. Lei, and R. Maric, “Ammonia gas sensors: A comprehensive review,” Talanta, vol. 204. 2019. doi: 10.1016/j.talanta.2019.06.034. [8] M. Eising, C. E. Cava, R. V. Salvatierra, A. J. G. Zarbin, and L. S. Roman, “Doping effect on self-assembled films of polyaniline and carbon nanotube applied as ammonia gas sensor,” Sensors and Actuators, B: Chemical, vol. 245, pp. 25–33, 2017, doi: 10.1016/j.snb.2017.01.132. [9] M. P. Diana, W. S. Roekmijati, and W. U. Suyud, “Why it is often underestimated: Historical Study of Ammonia Gas Exposure Impacts towards Human Health,” in E3S Web of Conferences, 2018, vol. 73. doi: 10.1051/e3sconf/20187306003. [10] R. T. Xu et al., “Half-Century Ammonia Emissions From Agricultural Systems in Southern Asia: Magnitude, Spatiotemporal Patterns, and Implications for Human Health,” GeoHealth, vol. 2, no. 1, 2018, doi: 10.1002/2017GH000098. [11] S. A. Akbar, A. Mardhiah, N. Saidi, and D. Lelifajri, “The effect of graphite composition on polyaniline film performance for formalin gas sensor,” Bulletin of the Chemical Society of Ethiopia, vol. 34, no. 3, 2021, doi: 10.4314/bcse.v34i3.14. [12] X. Wang, L. Gong, D. Zhang, X. Fan, Y. Jin, and L. Guo, “Room temperature ammonia gas sensor based on polyaniline/copper ferrite binary nanocomposites,” Sensors and Actuators B: Chemical, vol. 322, p. 128615, 2020, doi: https://doi.org/10.1016/j.snb.2020.128615. [13] L. Wang et al., “Enhanced Sensitivity and Stability of Room-Temperature NH3 Sensors Using Core–Shell CeO2 Nanoparticles@Cross-linked PANI with p–n Heterojunctions,” ACS Applied Materials &Interfaces, vol. 6, no. 16, pp. 14131–14140, Aug. 2014, doi: 10.1021/am503286h. [14] Y. Guo et al., “Hierarchical graphene–polyaniline nanocomposite films for high-performance flexible electronic gas sensors,” Nanoscale, vol. 8, no. 23, pp. 12073–12080, 2016, doi: 10.1039/C6NR02540D. [15] M. Eising, C. E. Cava, R. V. Salvatierra, A. J. G. Zarbin, and L. S. Roman, “Doping effect on self-assembled films of polyaniline and carbon nanotube applied as ammonia gas sensor,” Sensors and Actuators B: Chemical, vol. 245, pp. 25–33, 2017, doi: https://doi.org/10.1016/j.snb.2017.01.132. [16] S. Bai et al., “Transparent conducting films of hierarchically nanostructured polyaniline networks on flexible substrates for high-performance gas sensors,” Small, vol. 11, no. 3, 2015, doi: 10.1002/smll.201401865. [17] Z. Wu et al., “Enhanced sensitivity of ammonia sensor using graphene/polyaniline nanocomposite,” Sensors and Actuators, B: Chemical, vol. 178, 2013, doi: 10.1016/j.snb.2013.01.014. [18] N. R. Tanguy, B. Wiltshire, M. Arjmand, M. H. Zarifi, and N. Yan, “Highly Sensitive and Contactless Ammonia Detection Based on Nanocomposites of Phosphate-Functionalized Reduced Graphene Oxide/Polyaniline Immobilized on Microstrip Resonators,” ACS Applied Materials and Interfaces, vol. 12, no. 8, 2020, doi: 10.1021/acsami.9b21063. [19] D. Maity and R. T. R. Kumar, “Polyaniline Anchored MWCNTs on Fabric for High Performance Wearable Ammonia Sensor,” ACS Sensors, vol. 3, no. 9, 2018, doi: 10.1021/acssensors.8b00589. [20] J. Ma et al., “Multi-walled carbon nanotubes/polyaniline on the ethylenediamine modified polyethylene terephthalate fibers for a flexible room temperature ammonia gas sensor with high responses,” Sensors and Actuators, B: Chemical, vol. 334, May 2021, doi: 10.1016/j.snb.2021.129677. [21] A. Javadian-Saraf, E. Hosseini, B. D. Wiltshire, M. H. Zarifi, and M. Arjmand, “Graphene oxide/polyaniline-based microwave split-ring resonator: A versatile platform towards ammonia sensing,” Journal of Hazardous Materials, vol. 418, Sep. 2021, doi: 10.1016/j.jhazmat.2021.126283. [22] A. Liu et al., “The gas sensor utilizing polyaniline/ MoS2 nanosheets/ SnO2 nanotubes for the room temperature detection of ammonia,” Sensors and Actuators, B: Chemical, vol. 332, Apr. 2021, doi: 10.1016/j.snb.2021.129444. [23] Q. Feng, H. Zhang, Y. Shi, X. Yu, and G. Lan, “Preparation and gas sensing properties of PANI/SnO2 hybrid material,” Polymers, vol. 13, no. 9, May 2021, doi: 10.3390/polym13091360. [24] S. Benhouhou, A. Mekki, M. Ayat, and N. Gabouze, “Facile Preparation of PANI-Sr Composite Flexible Thin Film for Ammonia Sensing at Very Low Concentration,” Macromolecular Research, vol. 29, no. 4, pp. 267–279, Apr. 2021, doi: 10.1007/s13233-021-9034-3. [25] X. Wang et al., “In situ polymerized polyaniline/MXene (V2C) as building blocks of supercapacitor and ammonia sensor self-powered by electromagnetic-triboelectric hybrid generator,” Nano Energy, vol. 88, Oct. 2021, doi: 10.1016/j.nanoen.2021.106242. [26] J. Chang et al., “Polyaniline-Reduced Graphene Oxide Nanosheets for Room Temperature NH3Detection,” ACS Applied Nano Materials, vol. 4, no. 5, pp. 5263–5272, May 2021, doi: 10.1021/acsanm.1c00633. [27] S. Matindoust, A. Farzi, M. Baghaei Nejad, M. H. Shahrokh Abadi, Z. Zou, and L. R. Zheng, “Ammonia gas sensor based on flexible polyaniline films for rapid detection of spoilage in protein-rich foods,” Journal of Materials Science: Materials in Electronics, vol. 28, no. 11, 2017, doi: 10.1007/s10854-017-6471-z. [28] J. Cai, C. Zhang, A. Khan, C. Liang, and W. di Li, “Highly transparent and flexible polyaniline mesh sensor for chemiresistive sensing of ammonia gas,” RSC Advances, vol. 8, no. 10, pp. 5312–5320, 2018, doi: 10.1039/c7ra13516e. [29] T. Syrový et al., “Gravure-printed ammonia sensor based on organic polyaniline colloids,” Sensors and Actuators, B: Chemical, vol. 225, pp. 510–516, Mar. 2016, doi: 10.1016/j.snb.2015.11.062.

Styles APA, Harvard, Vancouver, ISO, etc.

17

Alyazeedi, Hamdia Hmmad. « March 2016 VOLUME 3, ISSUE 3, MARCH 2016 Composite Silicon Solar Cell Efficiency Simulation Study ; Sensitivity to the Absorption Coefficients and the Thickness of Intrinsic Absorber Layer V. Tudić, M. Marochini, T. Luke Abstract | PDF with Text| DOI 10.17148/IARJSET.2016.3301 Molecular Phylogeny of Turbinaria Ornata (Turner) J. Agardh E. Neelamathi and R. Kannan Abstract | PDF with Text| DOI 10.17148/IARJSET.2016.3302 Human Factors in Aircraft Maintenance Suhas H Begur, Dr J Ashok Babu Abstract | PDF with Text| DOI 10.17148/IARJSET.2016.3303 Human Factors in Aircraft Maintenance Suhas H Begur, Dr J Ashok Babu Abstract | PDF with Text| DOI 10.17148/IARJSET.2016.3304 Foliar nutraceutical and antioxidant property of Diospyros lanceifolia Roxb. (Ebenaceae) – An important medicinal plant of Assam, India Dipjyoti Kalita, N. Devi and D. Baishya Abstract | PDF with Text| DOI 10.17148/IARJSET.2016.3305 Study of Ion Mobility Characteristics and Morphology of some Electrochemically-Synthesised Polypyrroles Danesh Roudini, Peter J. S. Foot Abstract | PDF with Text| DOI 10.17148/IARJSET.2016.3306 Physico-Chemical Characterization of an Artificial Pond to Control the Eutrophication Process : A Case Study Sameer Al-Asheh, Hani Abu Qdais, Adnan Alquraishi, Osama Husain, Ismail Sadoon Abstract | PDF with Text| DOI 10.17148/IARJSET.2016.3307 Survey : Recommendation System for Web Portal using Customer Segmentation Neha Badami, Vipul Wakkar, Monica Jain, Devendra Pandit Abstract | PDF with Text| DOI 10.17148/IARJSET.2016.3308 Web Archiving : Past Present and Future of Evolving Multimedia Legacy Meenakshi Srivastava, Dr. S.K. Singh, Dr. S.Q. Abbas Abstract | PDF with Text| DOI 10.17148/IARJSET.2016.3309 Labour Contract Management System Kajol Bhutada, Ketaki Kivade, Vishakha Gokhale, Pallavi Bhore, Prof. Shiv Prasad P. Patil Abstract | PDF with Text| DOI 10.17148/IARJSET.2016.3310 Minimization of Torque Ripple and Multi Quadrant Operation of Direct Torque Control for Three Phase Induction Motor Using Fuzzy Logic Controller P.Ramesh Babu, S. Ramprasath, N.Vijayasarathi Abstract | PDF with Text| DOI 10.17148/IARJSET.2016.3311 Alert Me : A Real Time Video Surveillance System Implementing IoT D.P Gaikwad, Pooja kumawat, Saurabh Bhalerao, Akhilesh Khalate, Hrishikesh Dongre Abstract | PDF with Text| DOI 10.17148/IARJSET.2016.3312 Validity, Reliability and Item Analysis of AMAIUB Admission Test Dr. Lina S. Calucag and Dr. Danilo A. Tabalan Abstract | PDF with Text| DOI 10.17148/IARJSET.2016.3313 Design and Analysis of Track and Hold Circuit for high speed communication Smita D. Waghmare, Dr. U. A. Kshirsagar Abstract | PDF with Text| DOI 10.17148/IARJSET.2016.3314 Design of Low Power Digitally Operated Voltage Regulator by using CMOS Technology Nikita V. Dhomane, Dr. U. A. Kshirsagar Abstract | PDF with Text| DOI 10.17148/IARJSET.2016.3315 Automation in Ration Distribution System Rajesh B.Shinde, Prof. A.G. Gaikwad, Prof. Sonali Chincholikar Abstract | PDF with Text| DOI 10.17148/IARJSET.2016.3316 Use of MnSo4 Sludge as a Partial Replacement for Cement in Concrete Golhar Ankush, Jogdand Mohini, Malvi Ketan, Salunke Swanand, Gorade Swapnil Abstract | PDF with Text| DOI 10.17148/IARJSET.2016.3317 Ethnobotanical Studies on Medicinal Plant Utilization by the Yanadhi Tribe of Ananthasagaram Mandal, Nellore District, Andhra Pradesh, India K. Sasdhar, P. Brahmajirao and A. Sujith Kumar Abstract | PDF with Text| DOI 10.17148/IARJSET.2016.3318 Effect of Soil Structure Interaction on the Storey Lateral Displacement of a Multi Storied Building Surya Teja Ch, Sai Kiran T Abstract | PDF with Text| DOI 10.17148/IARJSET.2016.3319 An Overview of Narcolepsy Touseef Rahman, Omer Farook, Md Belal Bin Heyat, Mohd Maroof Siddiqui Abstract | PDF with Text| DOI 10.17148/IARJSET.2016.3320 Significance of Air Movement for Thermal Comfort in Educational Buildings, Case Study of a Classroom Geethu Priya, Nagaraju Kaja Abstract | PDF with Text| DOI 10.17148/IARJSET.2016.3321 A Load Balancing Approach to Minimize the Resource Wastage in Cloud Computing Sachin Soni, Praveen Yadav Abstract | PDF with Text| DOI 10.17148/IARJSET.2016.3322 Modeling and Simulation of Fluidized Bed Drying of Chickpea S.N. Saha, G.P. Dewangan, R.S. Thakur Abstract | PDF with Text| DOI 10.17148/IARJSET.2016.3323 Photocatalytic-Ozonation of Textile Dyeing Wastewater using Fixed Catalyst System Rajendiran S, Shriram B, Kanmani S Abstract | PDF with Text| DOI 10.17148/IARJSET.2016.3324 Mesh less Analysis of Orthotropic Skew Plate under Sinusoidal Line Load Kumari Shipra Suman, Jeeoot Singh Abstract | PDF with Text| DOI 10.17148/IARJSET.2016.3325 Performance Analysis of 2*2 Dual Frequency Wide Band Circular Patch Antenna Array P. Sai Vinay Kumar, P. Jagadamba, M. N. Giri Prasad Abstract | PDF with Text| DOI 10.17148/IARJSET.2016.3326 A Multi-Cloud Approach Towards Addressing Security Issues of Cloud : A Survey Kumar M.V, Poornima A. S Abstract | PDF with Text| DOI 10.17148/IARJSET.2016.3327 Improved Efficiency of Boiler Plant with Different GCV and Carbon Percentage Ishan. P. Bhatt, C.P. Panchal Abstract | PDF with Text| DOI 10.17148/IARJSET.2016.3328 Industrial Automation using Sensing based Applications for Internet of Things Geetesh Chaudhari, Sudarshan Jadhav, Sandeep Batule, Sandeep Helkar Abstract | PDF with Text| DOI 10.17148/IARJSET.2016.3329 Assessment of Engineering Students Learning ». IARJSET 3, n^o 3 (20 mars 2016) : 133–36. http://dx.doi.org/10.17148/iarjset.2016.3330.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

18

Henne, Reny Aldo, Martha Andreia Brand, Bianca Schveitzer et Viviane Aparecida Spinelli Schein. « THERMAL BEHAVIOR OF FOREST BIOMASS WASTES PRODUCED DURING COMBUSTION IN A BOILER SYSTEM ». Revista Árvore 43, n^o 1 (2019). http://dx.doi.org/10.1590/1806-90882019000100008.

Texte intégral

Résumé :

ABSTRACT It is known that during the biomass combustion in industrial systems the formation of residues containing ashes and residual carbon occurs. The content of the residues varies according to the efficiency and operating parameters of the combustion chambers. The characterization of these residues is an essential tool to identify their potential for energy reuse. The aim of this paper was to analyze the thermal behavior of the biomass and the residues yielded during the combustion process in a boiler system. For this purpose, forest biomass and ash samples have been analyzed in a laboratory and at four collection points of generation and treatment of the combustion residues (readler, hopper, scrubber, and decanter) inside the boiler of a power plant. The thermogravimetric analysis (TGA and DTA) have been carried out on all samples. Moreover, the ultimate analysis, the proximate analysis and the gross calorific value of all samples have been determined. Results show that the biomass burning efficiency in the boiler furnace was high, which was proven by the chemical composition and thermal degradation behavior of the residues collected in the readler. The scrubber’s light wastes presented chemical and energy properties (7180 kcal/kg, 75% fixed carbon content, 21% volatile content and 3.72% ash content), and thermal behavior similar to the ones found in the literature for eucalyptus charcoal. However, in order to reuse these combustion residues on reinjection or reheat systems, machine adjustments are essential to achieve burning efficiency and avoid operational problems. The decanter wastes did not show potential for energy reuse.

Styles APA, Harvard, Vancouver, ISO, etc.

19

Abro, Irfan A., Muhammad I. Abro, Mamdouh EH Assad, Mohammad Rahimi-Gorji et Nguyen M. Hoang. « Investigation and evaluation of neem leaves extract as a green inhibitor for corrosion behavior of mild steel : An experimental study ». Proceedings of the Institution of Mechanical Engineers, Part C : Journal of Mechanical Engineering Science, 5 juillet 2020, 095440622093772. http://dx.doi.org/10.1177/0954406220937723.

Texte intégral

Résumé :

It is a well-established fact that corrosion of mild steels occurs in pipelines, storage tanks, oil reservoirs, boilers, and petrochemicals industries. Green inhibitors are economical, non-toxic and eco-friendly, and forming barrier type layer of organic compounds over metallic materials. In this paper, weight loss, electrochemical measurements containing potential measurements, potentiodynamic polarization and impedance spectroscopy were applied to inspect the neem leaves extract inhibition efficiency and corrosion phenomenon under three conditions (X1, X2 and X3) in 1.0 M HCl medium. The characterization technique including scanning electron microscopy coupled with energy dispersive spectroscopy was conducted to scrutinize the elemental analysis, corrosive pitting and morphology of corrosion products of mild steel immersed in 1.0 M HCl medium with and without neem leaves extract concentration. The corrosion inhibition efficiency of neem leaves extract increased with increasing concentration and conditioning time. By increasing the conditioning time from 0.08 h to 72 h, the corrosion inhibition efficiency of neem leaves extract was increased from 75% to 97%. The neem leaves extract corrosion inhibitor works quite effectively only for 24 h, thereafter its efficiency drastically decreases. For 24 h, neem leaves extract prevented 80–90% corrosion attack but when steel immersion time was increased to 48 h and 72 h, its efficiency decreased from 83% to 65% and 52% to 42%, respectively.

Styles APA, Harvard, Vancouver, ISO, etc.

Articles de revues sur le sujet « Boiler efficiency characterization »

Créez une référence correcte selon les styles APA, MLA, Chicago, Harvard et plusieurs autres