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Received August 27, 2020
Accepted January 26, 2021
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Combined effects of yaw and tilt angles of separated overfire air on the combustion characteristics in a 1,000 MW coal-fired boiler: A numerical study
Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, Jiangsu Province 210096, P. R. China 1Jiangsu Frontier Electric Technology Co., Ltd., Nanjing, Jiangsu Province 211102, P. R. China
fqsi@seu.edu.cn
Korean Journal of Chemical Engineering, April 2021, 38(4), 771-787(17), 10.1007/s11814-021-0745-0
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Abstract
Separated overfire air (SOFA) is typically employed in coal-fired boilers with air staged technology to sustain lower NOX emission, and SOFA nozzle angles are crucial adjustment parameters. In this work, the combined effects of SOFA yaw and tilt angles on combustion characteristics were numerically investigated for a 1,000MW dual circle tangentially coal-fired boiler. Numerical results show that the forward increase of the SOFA yaw angle from 0o brings about the enlarged SOFA tangential circle and the gradual appearance of bimodal high-temperature zones at furnace exit. With further tuning SOFA tilt angles vertically, the bimodal high-temperature zones would separate to the two halves of the furnace, inducing a more severe deviation of gas temperature. Besides, the gas residual rotating momentum is strengthened as SOFA yaw angles forward increase, resulting in the enhancement of traction effect in the upper furnace as well as the rise of flame. However, the gas velocity deviation is somewhat eliminated as SOFA rotates reversely. No matter that the SOFA yaw angle increases forward or reversely, the coal burnout would deteriorate with the overly enlarged SOFA tangential circles. Tuning SOFA yaw and tilt angles, respectively, at 5o and 0o can simultaneously guarantee lower CO and NOX emissions.
Keywords
References
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Park HY, Baek SH, Kim HH, Kim YJ, Kim TH, Lim HS, Kang DS, Fuel, 166, 509 (2016)
Liu YC, Fan WD, Wu MZ, Appl. Therm. Eng., 110, 553 (2017)
Liu YC, Fan WD, Li Y, Appl. Energy, 177, 323 (2016)
Tan P, Tian DF, Fang QY, Ma L, Zhang C, Chen G, Zhong LJ, Zhang HG, Fuel, 196, 314 (2017)
Tian DF, Zhong LJ, Tan P, Ma L, Fang QY, Zhang C, Zhang DP, Chen G, Fuel Process. Technol., 138, 616 (2015)
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Shih TH, Liou WW, Shabbir A, Yang ZG, Zhu J, Comput. Fluids, 24, 227 (1995)
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Kobayashi H, Howard JB, Sarofim AF, Symp. Combust., 16, 411 (1977)
Guo YC, Chan CK, Lau KS, Fuel, 82(8), 893 (2003)
Sheng CD, Moghtaderi B, Gupta R, Wall TF, Fuel, 83(11-12), 1543 (2004)
Sivathanu YR, Faeth GM, Combust. Flame, 82, 211 (1990)
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Cheng P, AIAA J., 2, 1662 (1964)
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Kutne P, Kapadia BK, Meier W, Aigner M, P. Combust. Inst., 33, 3383 (2011)
Mulvihill CR, Petersen EL, Combust. Flame, 213, 291 (2020)
