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Numerical simulation of NOx reduction by injecting coal-water slurry pyrolysis gas into reduction zone of a 330 MW pulverized coal boiler
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Hao BAI1, Zhongxiao ZHANG1, 2, Zixiang LI2, Xinwei GUO3, Jian ZHANG1, Xiaojiang WU2
Thermal Power Generation | 2023, 52(5) : 136 - 144
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Thermal Power Generation | 2023, 52(5): 136-144
• Power generation technology forum •
Numerical simulation of NOx reduction by injecting coal-water slurry pyrolysis gas into reduction zone of a 330 MW pulverized coal boiler
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Hao BAI1, Zhongxiao ZHANG1, 2, Zixiang LI2, Xinwei GUO3, Jian ZHANG1, Xiaojiang WU2
Affiliations
  • 1.School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
  • 2.School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
  • 3.Ural Institute, North China University of Water Resources and Electric Power, Zhengzhou 450045, China
Published: 2023-05-25 doi: 10.19666/j.rlfd.202212174
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The denitrification effect of coal-water slurry pyrolysis gas is investigated by numerical simulation in a 330 MW power station pulverized coal boiler, focusing on the influence law of excess air coefficient α1 in the primary combustion zone (PCZ) and pyrolysis gas ratio β on the combustion characteristics and NOx emission in the furnace. The results show that, when β is kept constant, the temperature of the PCZ decreases and the temperature of over-fire air (OFA) zone and furnace outlet increases as α1 decreases. Meanwhile, the decrease of α1 enhances the reducing atmosphere in the PCZ, which is beneficial to improve the denitrification rate of pyrolysis gas and thus to reduce the NOx mass concentration at the furnace outlet. But the decrease of α1 will affect the combustion performance of the pulverized coal and increase the CO concentration at the furnace outlet. With the increase of β, the center of the furnace flame moves up and the reduction rate of NOx by pyrolysis gas increases. When β increases from 5% to 20%, the overall mass concentration of NOx in the furnace shows a trend of first decreasing and then increasing, and when β=15%, the NOx mass concentration reaches the lowest and the NOx reduction efficiency of the pyrolysis gas reaches 44.35%.

pulverized coal boiler  /  pyrolysis gas  /  combustion characteristics  /  NOx emission  /  numerical simulation
Hao BAI, Zhongxiao ZHANG, Zixiang LI, Xinwei GUO, Jian ZHANG, Xiaojiang WU. Numerical simulation of NOx reduction by injecting coal-water slurry pyrolysis gas into reduction zone of a 330 MW pulverized coal boiler[J]. Thermal Power Generation, 2023 , 52 (5) : 136 -144 . DOI: 10.19666/j.rlfd.202212174
Funding
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  • Research and Development Program(2018YFB0604202)
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Year 2023 volume 52 Issue 5
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Article Info
doi: 10.19666/j.rlfd.202212174
  • Online Date：2026-01-23
  • Published：2023-05-25
Article Data
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History
  • Revised：2022-12-16
Funding
Research and Development Program(2018YFB0604202)
Affiliations
    1.School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
    2.School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
    3.Ural Institute, North China University of Water Resources and Electric Power, Zhengzhou 450045, China
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https://castjournals.cast.org.cn/joweb/rlfd/EN/10.19666/j.rlfd.202212174
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表12种不同金属材料的力学参数
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Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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