王轶¹,樊雄飞¹,顾超¹,何宝晶¹,李伟¹,李兵¹,伍力拓²,杨浩²,杨祖旺²,张健²
WANG Yi¹, FAN Xiongfei¹, GU Chao¹, HE Baojing¹, LI Wei¹, LI Bing¹, WU Lituo², YANG Hao², YANG Zuwang², ZHANG Jian²

• 1:青铜峡铝业发电有限责任公司，陕西 青铜峡 751600
• 2:西安格瑞电力科技有限公司，西安 710000

摘要(Abstract)：

为解决燃煤机组瞬态过程中选择性催化还原技术（Selective Catalytic Reduction，SCR）系统精准喷氨困难的问题，基于数值计算结果对燃煤锅炉的省煤器出口烟道导板和SCR顶部导流板进行优化，建立被控系统和动态响应模型，利用人工智能算法在线完善模型，以实现精准喷氨。改造后，SCR入口烟道A、B侧烟气流速分别为9.0 m/s和9.2 m/s，相对标准偏差C_V值为11.4%和10.7%。SCR入口烟道A、B侧NO_x平均质量浓度为250.7 mg/m³和260.5 mg/m³，相对标准偏差C_V值分别为4.8%和5.0%。SCR出口烟道A、B侧NO_x平均放质量浓度为47.1 mg/m³和51.6 mg/m³，相对标准偏差C_V值分别为12.3%和12.5%，基本实现了超低排放的要求。液氨单耗从改造前0.278 3 kg/MWh下降到0.215 2 kg/MWh，下降了27.8%。
In order to address the difficulty of precise ammonia injection in the Selective Catalytic Reduction(SCR) system during the transient process of coal-fired power units, the author optimizes the outlet flue guide plate and SCR top guide plate of the economizer of a coal-fired boiler based on numerical calculation results, establishes a controlled system and dynamic response model, and improves the model online using artificial intelligence algorithms to achieve precise ammonia injection. After the renovation, the flue gas flow rates on the A and B sides of the SCR inlet flue are 9.0 m/s and 9.2 m/s respectively, with relative standard deviation (C_V) values of 11.4% and 10.7%. The average concentrations of NO_x on the A and B sides of the SCR inlet flue are 250.7 mg/m³ and 260.5 mg/m³ respectively, with C_V values of 4.8% and 5.0%. The average NO_x on the A and B sides of the SCR outlet flue are 47.1 mg/m³ and 51.6 mg/m³ respectively, with C_V values of 12.3% and 12.5%. These values meet the requirements of ultra-low emissions. The unit consumption of liquid ammonia decreases from 0.278 3 kg per MWh before the renovation to 0.215 2 kg per MWh, with a decrease of 27.8%.

关键词(KeyWords)： 燃煤锅炉;SCR优化;精准喷氨;流场优化;脱硝系统
coal-fired boiler;SCR optimization;precise ammonia injection;flow field optimization;denitrification system

Abstract:

Keywords:

基金项目(Foundation): 青铜峡铝业发电有限责任公司科技项目“2号机组SCR脱硝系统智能测控及调平系统技术研究及应用”（QIOLED-JG-2022-08-29）

作者(Author): 王轶¹,樊雄飞¹,顾超¹,何宝晶¹,李伟¹,李兵¹,伍力拓²,杨浩²,杨祖旺²,张健²
WANG Yi¹, FAN Xiongfei¹, GU Chao¹, HE Baojing¹, LI Wei¹, LI Bing¹, WU Lituo², YANG Hao², YANG Zuwang², ZHANG Jian²

DOI: 10.19929/j.cnki.nmgdljs.2023.0081

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