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Relevant bibliographies by topics / Supercritical boilers

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Academic literature on the topic 'Supercritical boilers'

Author: Grafiati

Published: 6 September 2023

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Journal articles on the topic "Supercritical boilers"

1

Pronobis, Marek, and Rafał Litka. "Rate of corrosion of waterwalls in supercritical pulverised fuel boilers." Chemical and Process Engineering 33, no. 2 (June 1, 2012): 263–77. http://dx.doi.org/10.2478/v10176-012-0026-x.

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Rate of corrosion of waterwalls in supercritical pulverised fuel boilers This paper presents an analysis of the corrosion hazard in the burner belt area of waterwalls in pulverised fuel (PF) boilers that results from low-NOx combustion. Temperature distributions along the waterwall tubes in subcritical (denoted as SUB) and supercritical (SUP) boilers were calculated and compared. Two hypothetical distributions of CO concentrations were assumed in the near-wall layer of the flue gas in the boiler furnace, and the kinetics of the waterwall corrosion were analysed as a function of the local temperature of the tubes. The predicted rate of corrosion of the boiler furnace waterwalls in the supercritical boilers was compared with that of in the subcritical boilers.

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Ma, Da Fu, and Xiao Hong Hao. "Status and Prospect of Large-Scale Circulating Fluidized Bed Boiler." Advanced Materials Research 516-517 (May 2012): 444–47. http://dx.doi.org/10.4028/www.scientific.net/amr.516-517.444.

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The paper is focused on the present situation and the development of large-scale circulating fluidized bed (CFB) boilers. Several developed technology of CFB such as supercritical and ultra supercritical pressure CFB boilers for power plants, oxy-fuel CFB boiler for CO2 capture and high-density circulating fluidized bed gasifier for advanced IGCC/IGFC are introduced in this paper.

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Deng, Boyu, Tuo Zhou, Shuangming Zhang, Haowen Wu, Xiaoguo Jiang, Man Zhang, and Hairui Yang. "Safety Analysis on the Heating Surfaces in the 660 MW Ultra-Supercritical CFB Boiler under Sudden Electricity Failure." Energies 15, no. 21 (October 27, 2022): 7982. http://dx.doi.org/10.3390/en15217982.

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Ultra-supercritical circulating fluidized bed (CFB) boilers are taking up an increasing proportion of the CFB boiler fleet in China, making the safety concern about the heating surfaces in this type of boilers under sudden electricity failure draw more and more attention from the industry. For the time being, however, few studies have made efforts to resolve this concern. Given this, the physical process in a 660 MW ultra-supercritical boiler during the electricity failure accident was precited with a comprehensive model composed of mass and energy conservation equations in this work. The tube temperature of the boiler components with the highest safety risk, i.e., the water wall and a superheater, was obtained to evaluate the safety of the heating surfaces. The results revealed that the tube temperature (about 516 °C and 544 °C) would be obviously lower than the maximum permissible temperature of the tube material (600 °C and 630 °C) even when electricity could be restored at the power plant, indicating that the heating surfaces in the 660 MW ultra-supercritical CFB boilers would generally be recognized to be safe under sudden electricity failure.

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Li, Mengxi, and Chao Zhang. "Numerical Investigation of the Influence of Furnace Wall Temperature on Pulverized Coal Combustion and NO_x Emissions in a Supercritical CO₂ Boiler." Journal of Physics: Conference Series 2449, no. 1 (March 1, 2023): 012024. http://dx.doi.org/10.1088/1742-6596/2449/1/012024.

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Abstract A study on the combustion process and NOx emission of pulverized coal in a supercritical CO2 boiler was carried out by using the method of numerical simulation. Using a comprehensive combustion model and a post-treatment NOx formation model, the influence of wall temperature on the characteristics of combustion and NOx emissions of a 300 MW tangential coal-fired boiler were studied. The temperature field and the concentration distribution of waste flue gas at the furnace outlet are analysed and studied. It was found that the furnace wall temperature seriously affected both the distribution of the temperature field and the emission of NOx. The supercritical CO2 boiler’s partial flow strategy led to further increases in temperature and NOx near the tail. According to the results of the calculations, the supercritical CO2 boiler might raise the exhaust gas temperature, making the difficulty of extracting energy from waste gas increased dramatically. The increased NOx emissions will lead to higher cost for implementation of after treatment of NOx emissions. The work’s findings can be used to improve the design of coal-fired supercritical CO2 boilers as well as gain a deeper comprehension of the formation of NOx.

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Jin, Yingai, Yanwei Sun, Yuanbo Zhang, and Zhipeng Jiang. "Research on Air Distribution Control Strategy of Supercritical Boiler." Energies 16, no. 1 (December 31, 2022): 458. http://dx.doi.org/10.3390/en16010458.

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Supercritical boilers have become a major development trend in coal-fired power plants, and the air distribution strategy is a key factor in the design and operation of making it fully combustible. In this paper, the mathematical and physical models of a 350 MW supercritical boiler is established, and the optimal air distribution mode of the boiler at different load is determined based on the furnace outlet temperature, NOx concentration, and O2 content. The air distribution control strategies were derived and the corresponding procedures were established. 160 MW and 280 MW were selected for positive pagoda and 180 MW and 230 MW for waist reduced. At 290–350 MW load, the effect of adjusting the combustion damper opening on the outlet oxygen is weak, so preferentially adjusting the SOFA damper opening can achieve better results. The results show good thermal efficiency and emission performance and are applicable to adjust the air distribution mode to achieve fuller combustion of supercritical boilers.

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Vikhraman Muniandy, Mohd Sharizal Abdul Aziz, and Hadafi Fitri Mohd Latip. "Study on The Improvement of Heat Recovery Steam Generator Efficiency – A Review." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 94, no. 2 (May 24, 2022): 89–98. http://dx.doi.org/10.37934/arfmts.94.2.8998.

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Boilers are widely used in industries to produce steam. In some sectors, the steam generated is utilized directly in the production line for heating. Certain industries use steam to produce electricity. Fire tube boilers are limited to generating steam for processing; meanwhile, water tube boilers are widely used in electricity generation besides steam generation for processing lines. Subcritical boilers, supercritical boilers, and Heat Recovery Steam Generator (HRSG) are types of boilers commonly used to produce high capacity steam. This review article focuses on the optimization of HRSG operational efficiency. Industry players are keen on the improvement of operational efficiency since these directly influence the operating cost. Steam pressure, steam output, heat transfer efficiency and temperature distributions are key areas comprehensively reviewed in this article. Generally, improvement studies on boilers are not feasible to conduct during operation. Therefore, the scaled-down model used in the experiment or the boilers CFD models are simulated to understand the characteristics of the boilers. This review article is expected to overview HRSG boiler efficiency improvements and factors influencing boiler operational parameters.

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Chandrasekharan, Sreepradha, Rames Chandra Panda, and Bhuvaneswari Natrajan Swaminathan. "Dynamic analysis of the boiler drum of a coal-fired thermal power plant." SIMULATION 93, no. 11 (April 13, 2017): 995–1010. http://dx.doi.org/10.1177/0037549717703465.

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The subcritical coal-fired boilers of thermal power plants consist of a combustion chamber, economizer unit, drum unit (drum, riser, and downcomer), superheater unit (primary superheater, secondary superheater, and final superheater), and reheater unit. The input and output of these units are highly interactive in nature. The efficiency of the subcritical plants is only around 33%. The efficiency needs to be increased to produce more power for the increasing demand, which can be achieved only by implementing supercritical technology or ultra-supercritical technology. However, the conversion of existing subcritical power plants to supercritical power plants is impossible due to the installation cost. So in order to increase the overall efficiency of the existing subcritical power plants, boilers of such units must be examined in order to find safer operational practices. This paper highlights the mathematical modeling of the economizer unit and drum unit of boiler, which can help in enhancing the performance of the boiler system of the power plant. Mass and energy balances for the integrating boiler units have been formulated using first principle laws. The developed model has then been validated with actual plant data obtained from a 210 MW coal-fired thermal power plant. The performance of the open loop responses of the model are analyzed and are included in the results and discussion of the paper. The model provides support for level, pressure, and temperature measurements and predictions. The effect of changes in the parameters of the boiler are studied and discussed in detail.

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Lu, Xiao, Chao Yang Wang, Gang Wei, and Shou Wei Yang. "Study of Cold-State Aerodynamic Field Test on the Outlet of 2150t/h Supercritical Once-Through Boiler." Applied Mechanics and Materials 448-453 (October 2013): 3217–22. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.3217.

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The new unit putting into production is the supercritical boiler with a level of or above 600 MW, and most of them take the corner tangential combustion technology. The Long-term operation practice shows that there is gas temperature deviation on all the horizontal flues of boilers, which usually leads to the overheating tube burst of the high-temperature superheater and reheater, thus threats the safe and economic operation of power station. Towards the gas temperature deviation phenomenon that exists commonly in tangentially fired boiler, this paper went on the pertinent cold-state aerodynamic field test on the tangentially fired boilers in one new power plant and studied the airflow velocity at the furnace outlet in eight vertical levels by changing the SOFA horizontally rotating angle. The experiment showed that changing the baffles opening and horizontally rotating angle of SOFA air door could adjust airflow quite well and make it uniform, furthermore, the airflow can reach a basic balance at the biggest anti-tangential angle. This paper has some reference value towards improving the gas temperature deviation problem of tangentially fired boilers.

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Nie, Li, Jiayi Lu, Qigang Deng, Liming Gong, Dayong Xue, Zhongzhi Yang, and Xiaofeng Lu. "Study on the Uniformity of Secondary Air of a 660 MW Ultra-Supercritical CFB Boiler." Energies 15, no. 10 (May 14, 2022): 3604. http://dx.doi.org/10.3390/en15103604.

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Based on the field test of a 600 MW supercritical circulating-fluidized bed boiler, this paper optimizes the secondary air pipe layout scheme of a 660 MW ultra-supercritical circulating fluidized bed boiler with a similar furnace structure and carried out a numerical simulation on its air distribution uniformity. The secondary air box of the 660 MW ultra-supercritical circulating-fluidized bed boiler adopts a variable section design, and the secondary air branch pipe adopts a separate air inlet mode. The experimental results showed that the oxygen concentration was uniform near the rear wall, but all exhibited a “decrease–increase–decrease” profile along the horizontal line, which indicated that the trajectory of the secondary air jet was first in the shape of bending downward and then upward. To achieve a more uniform secondary air distribution for supercritical CFB boilers, further optimization of the layout of the bellows and branch pipes should be considered. Numerical results showed that the deviation rate of the internal and lower secondary air reached 17%, and there was optimization space for the secondary air branch pipe layout of the boiler. Its uniformity can be increased by adding valves and other measures. The velocity deviation of the secondary air of the 660 MW ultra-supercritical circulating-fluidized bed boiler can be within 3% by means of separate air supply and pipe diameter change, and better uniform air supply can be achieved to reduce the speed deviation by adding valves and adjusting the combustion.

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Błaszczuk, Artur, Wojciech Nowak, and Szymon Jagodzik. "Bed-To-Wall Heat Transfer in a Supercritical Circulating Fluidised Bed Boiler." Chemical and Process Engineering 35, no. 2 (June 1, 2014): 191–204. http://dx.doi.org/10.2478/cpe-2014-0015.

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Abstract The purpose of this work is to find a correlation for heat transfer to walls in a 1296 t/h supercritical circulating fluidised bed (CFB) boiler. The effect of bed-to-wall heat transfer coefficient in a long active heat transfer surface was discussed, excluding the radiation component. Experiments for four different unit loads (i.e. 100% MCR, 80% MCR, 60% MCR and 40% MCR) were conducted at a constant excess air ratio and high level of bed pressure (ca. 6 kPa) in each test run. The empirical correlation of the heat transfer coefficient in a large-scale CFB boiler was mainly determined by two key operating parameters, suspension density and bed temperature. Furthermore, data processing was used in order to develop empirical correlation ranges between 3.05 to 5.35 m·s-1 for gas superficial velocity, 0.25 to 0.51 for the ratio of the secondary to the primary air, 1028 to 1137K for bed temperature inside the furnace chamber of a commercial CFB boiler, and 1.20 to 553 kg·m-3 for suspension density. The suspension density was specified on the base of pressure measurements inside the boiler’s combustion chamber using pressure sensors. Pressure measurements were collected at the measuring ports situated on the front wall of the combustion chamber. The obtained correlation of the heat transfer coefficient is in agreement with the data obtained from typical industrial CFB boilers.

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Dissertations / Theses on the topic "Supercritical boilers"

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WU, QUANYAN. "MICROSTRUCTURAL EVOLUTION IN ADVANCED BOILER MATERIALS FOR ULTRA-SUPERCRITICAL COAL POWER PLANTS." University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1154363707.

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Brunner, David R. "The Composition and Distribution of Coal-Ash Deposits Under Reducing and Oxidizing Conditions From a Suite of Eight Coals." BYU ScholarsArchive, 2011. https://scholarsarchive.byu.edu/etd/2642.

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Eighteen elements, including: carbon, oxygen, sodium, magnesium, aluminum, silicon, phosphorus, sulfur, chlorine, potassium, calcium, titanium, chromium, manganese, iron, nickel, strontium, and barium were measured using a scanning electron microscope with energy dispersive spectroscopy from deposits. The deposits were collected by burning eight different coals in a 160 kWth, staged, down-fired, swirl-stabilized combustor. Both up-stream and down-stream deposits from an oxidizing region (equivalence ratio 0.86) and reducing region (equivalence ratio 1.15) were collected. Within the deposits, the particle size and morphology were studied. The average particle cross-sectional area from the up-stream deposits ranged from 10 - 75 µm2 and had a standard deviation of 36 - 340 µm2. These up-stream particles were of various shapes: spherical, previously molten particles; irregular particle that had not melted, hollowed spherical shells; and layered or strands of particles. These particles were a mixture of burned and unburned coal being deposited at various stages of burnout and having completed some burnout after deposition. The average particle cross-sectional area from the down-stream deposits ranged 0.9 - 7 µm2 and the standard deviation range of 2.6 - 30 µm2. The shape of the particles on the bottom sleeves are typically spherical indicating melting prior to deposition. Particles contained a distribution of elemental compositions that were not tightly grouped on ternary phase diagrams. This indicated that particles were not single compounds or phases but each particle contained a mixture of multiple compounds. Coals' deposit sulfur was strongly correlated with the calcium and iron content of the ASTM ash analysis. The low rank sub-bituminous and lignite coals that had high calcium content produced high sulfur deposits, particularly in the oxidizing region, down-stream deposits. The high iron bituminous coals, also produced high sulfur deposits, but more so in the reducing region, up-stream deposits. The low calcium and low iron coals produced low sulfur deposits. Mahoning was an exception being high in iron content but remaining low in sulfur content in the deposit. Gatling coal showed numerous deposit particles that contained only iron and sulfur consistent with the high pyrite content of Gatling coal. The average concentration of chlorine was insignificant in all of the deposits with the concentration being less than 100 ppm. Individual particles containing chlorine were found and were associated with potassium, sodium, and iron.

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Huang, Jian-Yuan, and 黃建元. "Carbon Migration Study of T91 Creep-Resistant Dissimilar Weldment Applied in Ultra-Supercritical Boiler." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/6r56ac.

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碩士
國立臺灣大學
材料科學與工程學研究所
107
In this study, we use two kinds of fillers, such as T23 and 309L, to weld T23/T91 and 304H/T91 by TIG (Tungsten Inert Gas) separately. The quality of the weldment is examined by using NDT (Nondestructive Testing). Heat treatments are performed after specimens selected from wire cutting of the qualified weldments. In this study, during the aging test of dissimilar weldments under high temperature and long time, carbon migration will occur at the fusion line. Because there is the most obvious difference of chromium concentrations at the fusion line, it causes different activities of carbon atoms diffuse from low-alloy to high-alloy. To balance the solubility of carbon, the carbides dissolve into the base at low-alloy. This is the mechanism of formation of decarburization zone. Besides, decarburization zone can be confirmed by optical microscope and the variation of micro-hardness values. In the T23/T23/T91 part, after PWHT and simulated aging test for 100,000 hours, the continuous and coarse decarburization zone forms at the interface of T23 weldment and T91 HAZ. The micro-hardness of decarburization zone decreases significantly. In 304H/309L/T91 part, after PWHT and simulated aging test for 200,000 hours, the continuous decarburization zone forms at the interface of 309L weldment and T91 HAZ. The micro-hardness of decarburization zone decreases. The change in the values of micro-hardness is not obvious compared with the former. With the longer time period in the aging test, the size of decarburization zone becomes larger. The formation of decarburization zone deteriorates the mechanical properties and reliability of the T91 weldment applied in ultra-supercritical boiler.

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Van, Rooy Willem. "Solar thermal augmentation of the regenerative feed-heaters in a supercritical Rankine cycle with a coalfired boiler / W.L. van Rooy." Thesis, 2015. http://hdl.handle.net/10394/15901.

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Conventional concentrating solar power (CSP) plants typically have a very high levelised cost of electricity (LCOE) compared with coal-fired power stations. To generate 1 kWh of electrical energy from a conventional linear Fresnel CSP plant without a storage application, costs the utility approximately R3,08 (Salvatore, 2014), whereas it costs R0,711 to generate the same amount of energy by means of a highly efficient supercritical coal-fired power station, taking carbon tax into consideration. This high LCOE associated with linear Fresnel CSP technology is primarily due to the massive capital investment required per kW installed to construct such a plant along with the relatively low-capacity factors, because of the uncontrollable solar irradiation. It is expected that the LCOE of a hybrid plant in which a concentrating solar thermal (CST) station is integrated with a large-scale supercritical coal-fired power station, will be higher than that of a conventional supercritical coal-fired power station, but much less than that of a conventional CSP plant. The main aim of this study is to calculate and then compare the LCOE of a conventional supercritical coal-fired power station with that of such a station integrated with a linear Fresnel CST field. When the thermal energy generated in the receiver of a CST plant is converted into electrical energy by using the highly efficient regenerative Rankine cycle of a large-scale coal-fired power station, the total capital cost of the solar side of the integrated system will be reduced significantly, compared with the two stations operating independently of one another for common steam turbines, electrical generators and transformers, and transmission lines will be utilised for the integrated plants. The results obtained from the thermodynamic models indicate that if an additional heat exchanger integration option for a 90 MW (peak thermal) fuel-saver solar-augmentation scenario, where an annual average direct normal irradiation limit of 2 141 kWh/m2 is considered, one can expect to produce approximately 4,6 GWh more electricity to the national grid annually than with a normal coal-fired station. This increase in net electricity output is mainly due to the compounded lowered auxiliary power consumption during high solar-irradiation conditions. It is also found that the total annual thermal energy input required from burning pulverised coal is reduced by 110,5 GWh, when approximately 176,5 GWh of solar energy is injected into the coal-fired power station’s regenerative Rankine cycle for the duration of a year. Of the total thermal energy supplied by the solar field, approximately 54,6 GWh is eventually converted into electrical energy. Approximately 22 kT less coal will be required, which will result in 38,7 kT less CO2 emissions and about 7,6 kT less ash production. This electricity generated from the thermal energy supplied by the solar field will produce approximately R8,188m in additional revenue annually from the trade of renewable energy certificates, while the reduced coal consumption will result in an annual fuel saving of about R6,189m. By emitting less CO2 into the atmosphere, the annual carbon tax bill will be reduced by R1,856m, and by supplying additional energy to the national grid, an additional income of approximately R3,037m will be due to the power station. The annual operating and maintenance cost increase resulting from the additional 171 000 m2 solar field, will be in the region of R9,71m. The cost of generating 1 kWh with the solar-augmented coal-fired power plant will only be 0,34 cents more expensive at R0,714/kWh than it would be to generate the same energy with a normal supercritical coal-fired power station. If one considers that a typical conventional linear Fresnel CSP plant (without storage) has an LCOE of R3,08, the conclusion can be drawn that it is much more attractive to generate electricity from thermal power supplied by a solar field, by utilising the highly efficient large-scale components of a supercritical coal-fired power station, rather than to generate electricity from a conventional linear Fresnel CSP plant.
MIng (Mechanical Engineering), North-West University, Potchefstroom Campus, 2015

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Book chapters on the topic "Supercritical boilers"

1

Basu, Prabir, Cen Kefa, and Louis Jestin. "Forced Circulation for Supercritical or Subcritical Boilers." In Mechanical Engineering Series, 372–84. New York, NY: Springer New York, 2000. http://dx.doi.org/10.1007/978-1-4612-1250-8_13.

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Li, Daolin, Meiping Yu, Yue Dai, Po Jun, and Guoxiong Chen. "The Sootblowing Optimization System for 900MW Supercritical Boilers." In Challenges of Power Engineering and Environment, 615–19. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-76694-0_115.

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Wang, Yan, Fang-hong Xu, Yang Li, Li Zeng, Sha Li, and Jian-min Li. "Deformation Characteristic of 617B Nickel Base Superalloy for 700°C Ultra-Supercritical Boilers." In HSLA Steels 2015, Microalloying 2015 & Offshore Engineering Steels 2015, 791–97. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119223399.ch98.

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Holcomb, Gordon R. "High Pressure Steam Oxidation of Ni-Base Superalloys in Advanced Ultra-Supercritical Steam Boilers and Turbines." In 8th International Symposium on Superalloy 718 and Derivatives, 611–27. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781119016854.ch48.

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Wei, Pi-guang, Wen-hua Zhu, and Hao Zhou. "Research on Virtual Assembly of Supercritical Boiler." In Lecture Notes in Computer Science, 477–85. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-15621-2_52.

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Zhang, Dalong, Hang Shi, Chenwei Meng, Yuxin Wu, Hai Zhang, Wu Zhou, and Shenming Ran. "Measurements on Heat Flux Distribution in a Supercritical Arch-Fired Boiler." In Clean Coal Technology and Sustainable Development, 207–12. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-2023-0_27.

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Yang, D., J. Pan, Q. C. Bi, Y. J. Zhang, X. G. Jian, and L. Yu. "Research on the Hydraulic Characteristics of a 600MW Supercritical Pressure CFB Boiler." In Proceedings of the 20th International Conference on Fluidized Bed Combustion, 180–85. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-02682-9_22.

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Xin, Shengwei, Yingping Li, Peng Zhang, Changhua Hu, Man Zhang, and Hu Wang. "Progress and Main Technical Characteristics of Ultra-supercritical Circulating Fluidized Bed Boiler." In Clean Coal and Sustainable Energy, 547–59. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-1657-0_42.

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Zhang, Tianyu, and Zhenning Zhao. "Furnace Outlet Temperature Prediction Model of a 350 MW Ultra-Supercritical Boiler." In Clean Coal and Sustainable Energy, 1069–74. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-1657-0_83.

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Li, Y., L. Nie, X. K. Hu, G. X. Yue, W. K. Li, Y. X. We, J. F. Lu, and D. F. Che. "Structure and Performance of a 600MWe Supercritical CFB Boiler with Water Cooled Panels." In Proceedings of the 20th International Conference on Fluidized Bed Combustion, 132–36. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-02682-9_14.

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Conference papers on the topic "Supercritical boilers"

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Halder, Prabir K. "Design Considerations of Oxy-Fuel Fired Supercritical Pressure Circulating Fluidized Bed Boilers." In ASME 2006 Power Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/power2006-88011.

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Researchers around the globe are focussing on the capture and storage of carbon dioxide generated from the combustion of coal in boilers for power generation. Oxygen fired boilers have the advantage of creating CO2 rich flue gas which enables the CO2 to be captured in a more cost effective manner compared to post combustion capture of CO2 from an air fired boiler. This paper discusses design considerations for oxy-fuel fired supercritical circulating fluidized bed boilers. A 420 MWe supercritical CFB boiler firing coal with oxygen has been considered for the study. An analytical/semi-empirical model has been developed to model fuel combustion and heat transfer in the furnace and convection pass. The fuel burns with oxygen supplied at the bottom of the bed and the fluidization velocity and bed temperature is controlled by flue gas recirculation. The model is used to design the boiler and determine its performance characteristics. The heating surfaces, recirculation ratios and other parameters have been designed to achieve the required boiler capacity. The impact of the CO2 rich flue gas on CFB boiler design is compared with conventional air blown CFB boilers. The study reveals that oxy-fuel combustion in a CFB combustor does not alter the heat transfer characteristics when compared with combustion with air. In the convection bank, oxyfuel combustion increases both convective and radiative components of heat transfer, thereby reducing the size of the heat transfer banks required.

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Wei, Bing, and Dong Zhou. "Validation of Hydrodynamic Stability of Supercritical Once-Through Boiler." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-68280.

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Operating safety is one of the most important things to supercritical once-through boilers. To study the hydrodynamic characteristics of fluid in water walls of supercritical once-through boilers and to find out the instable factors will be of great significance to boiler operation. In this paper the mathematical models for hydrodynamic characteristics of fluid in water walls are established. With an example of 600MW boiler, by using the calculation program, the hydrodynamic characteristics curves without and with the throttles at the inlets of the water walls at different operating conditions are presented, the fluid flow instability and the reasons are analyzed. The calculation results show that the boiler operates stably and safely at 100% MCR (Maximum Continuous Rating) condition, the hydrodynamic instability exists at low heating loads of 30% MCR. The method of installing the throttles at the inlets of the water wall pipes will increase the parabola characteristics, help to improve the fluid instability to a certain stable extent, but due to the small curve slopes at low mass flowrates, still need to pay more attention to the low heating loads operation. The existence of gravity pressure head is good to the stability of the vertical upward flow.

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Qin, Zhiming, Junjie Gu, and Luanying Zhang. "Heat Storage Calculation Model for Supercritical Once-through Boilers." In 3rd International Conference on Mechatronics, Robotics and Automation. Paris, France: Atlantis Press, 2015. http://dx.doi.org/10.2991/icmra-15.2015.173.

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Jin, Yingai, Yuanbo Zhang, and Zhipeng Jiang. "Numerical calculation and strategy on air distribution of supercritical boilers." In 2020 5th Asia Conference on Power and Electrical Engineering (ACPEE). IEEE, 2020. http://dx.doi.org/10.1109/acpee48638.2020.9136401.

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Wang, Shuai, and Xuefei Li. "Experimental Study on Combustion Optimization for 1000MW Ultra-supercritical Boilers." In 2021 3rd International Academic Exchange Conference on Science and Technology Innovation (IAECST). IEEE, 2021. http://dx.doi.org/10.1109/iaecst54258.2021.9695605.

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Kong, Xiangfei, Xin Liu, Kaikai Guo, Yuan Feng, and Huixiong Li. "Experimental Study on the Density Wave Oscillations of Supercritical Water in Vertical Upward Tubes." In ASME 2017 Power Conference Joint With ICOPE-17 collocated with the ASME 2017 11th International Conference on Energy Sustainability, the ASME 2017 15th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2017 Nuclear Forum. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/power-icope2017-3471.

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Abstract:

Supercritical and ultra-supercritical pressure boilers have been widely used in China because of its advantages of high capability, high thermal efficiency and low pollutants emission. In view of the high working parameters and complicated working conditions of such boilers, safe and stable operations of these boilers have become the focus of attention of related researchers and engineers for many years. As one of the most important phenomena that may occur in thermal power plants, flow instabilities of water in boilers’ water-cooled wall may result in heat transfer deterioration, thermal fatigue of pipes and even breakdown of the supercritical units, and have thus attracted much attention of developers and researchers of the boilers. However, due to difficulties in carrying out experiments on the density wave oscillation of water under supercritical pressures, the related experimental data is very rare, and moreover, the characteristics of density wave oscillations of water under supercritical pressures has not been well understood. A series of experiments have been conducted on the density wave oscillation of water flowing at supercritical pressures in a 6-m long vertical upward tube with 20.0-mm internal diameter. The experimental parameters cover the pressures from 23 to 27 MPa, the mass fluxes from 300 to 600 kg·m−2·s−1, and the heat fluxes from 225 to 500 kW·m−2. Three types of density wave oscillation were found in the present study: 1) stable periodic density wave oscillation, 2) attenuated density wave oscillation, 3) divergent density wave oscillation. Effects of pressures, mass fluxes and heat fluxes on the density wave oscillation were analyzed. With the increase in pressures and mass fluxes, the density wave oscillation of supercritical pressure water can be postponed, and is difficult to occur. And the density wave oscillation will be triggered and enhanced by increasing the heating flux. The mechanism of density wave oscillation of supercritical pressure water in tubes was also analyzed, and a dataset was established for the verification of related numerical calculations and modeling.

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Wang, Jiacheng, Jingyi Du, and Kang Chen. "Improved Prediction Method for Oxidation Skin Scale Accumulation in Supercritical Pressure Boilers." In 2019 IEEE 4th Advanced Information Technology, Electronic and Automation Control Conference (IAEAC). IEEE, 2019. http://dx.doi.org/10.1109/iaeac47372.2019.8997542.

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8

Che, Chang, Gong Qian, and Xisheng Yang. "A Quantitative Assessment of Microstructural Evolution for Grade 91." In ASME 2018 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/pvp2018-84273.

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Abstract:

China has the most supercritical boilers in the world. Grade 91 steels are widely used for high temperature components of supercritical boiler. During high temperature service, microstructural evolution of Grade 91 steel may affect the mechanical properties, including creep strength. However, there are very few studies on quantitative assessment of microstructural evolution for Grade 91 steel, especially on precipitates content. In this article, microstructural evolution of Grade 91 was studied. A quantitative assessment of microstructure evolution was given during long-term creep, focusing on the precipitated phase content in Grade 91 steel. The results show, the precipitates content of Grade 91 steel has a corresponding relationship with creep damage.

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Baker, B. A. "A New Alloy Designed for Superheater Tubing in Coal-Fired Ultra Supercritical Boilers." In Superalloys. TMS, 2005. http://dx.doi.org/10.7449/2005/superalloys_2005_601_611.

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Liu, La-Xun, Han Liu, and Hui-Long Wang. "Adaptive decoupling control systems based on SVM for large supercritical CFB boilers combustion system." In 2012 10th World Congress on Intelligent Control and Automation (WCICA 2012). IEEE, 2012. http://dx.doi.org/10.1109/wcica.2012.6359035.

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Reports on the topic "Supercritical boilers"

1

J. Shingledecker, D. Gandy, N. Cheruvu, R. Wei, and K. Chan. Computation Modeling and Assessment of Nanocoatings for Ultra Supercritical Boilers. Office of Scientific and Technical Information (OSTI), June 2011. http://dx.doi.org/10.2172/1039985.

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2

Swindeman, RW. Safe Use Limits for Advanced Ferritic Steels in Ultra-Supercritical Power Boilers. Office of Scientific and Technical Information (OSTI), November 2003. http://dx.doi.org/10.2172/885704.

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3

Zhen Fan, Steve Goidich, Archie Robertson, and Song Wu. Ultra-Supercritical Pressure CFB Boiler Conceptual Design Study. Office of Scientific and Technical Information (OSTI), June 2006. http://dx.doi.org/10.2172/908300.

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4

Andrew Seltzer, Zhen Fan, and Archie Robertson. Conceptual Design of Supercritical O2-Based PC Boiler. Office of Scientific and Technical Information (OSTI), September 2006. http://dx.doi.org/10.2172/914572.

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5

Purgert, Robert, John Shingledecker, James Pschirer, Reddy Ganta, Paul Weitzel, Jeff Sarver, Brian Vitalis, Michael Gagliano, Greg Stanko, and Peter Tortorelli. Boiler materials for ultra supercritical coal power plants. Office of Scientific and Technical Information (OSTI), December 2015. http://dx.doi.org/10.2172/1346714.

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Andrew Seltzer and Archie Robertson. Economic Analysis for Conceptual Design of Supercritical O2-Based PC Boiler. Office of Scientific and Technical Information (OSTI), September 2006. http://dx.doi.org/10.2172/908301.

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Fan, Zhen, and Andrew Seltzer. Advanced O2 Separation System Integration for Conceptual Design of Supercritical O2-Based PC Boiler. Office of Scientific and Technical Information (OSTI), April 2006. http://dx.doi.org/10.2172/903472.

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Andrew Seltzer. Furnace and Heat Recovery Area Design and Analysis for Conceptual Design of Supercritical O2-Based PC Boiler. Office of Scientific and Technical Information (OSTI), May 2006. http://dx.doi.org/10.2172/903473.

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9

Ouyang, Lizhi. Large Scale Screening of Low Cost Ferritic Steel Designs For Advanced Ultra Supercritical Boiler Using First Principles Methods. Office of Scientific and Technical Information (OSTI), November 2016. http://dx.doi.org/10.2172/1417484.

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