SCR烟气脱硝系统出口烟道NO_x测点技术改造
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摘要
燃煤电站锅炉排放的氮氧化物是大气污染的一个重要来源,控制NO_x排放已成为当前电厂的重要工作。上海漕泾电厂分别于2014年和2015年实施了超低排放改造工程,在改造后的长期运行过程中发现,1号机组选择性催化还原烟气脱硝法(SCR)装置出口NO_x浓度值与烟囱出口数据有着较大偏差。通过对SCR所在烟道流场的数值模拟发现,原有SCR进出口的测点在烟道入口NO_x浓度分布不均匀时不能准确测量出NO_x的浓度值,因此对原有的NO_x出口测点进行了技术改造,变原来的2点平均测量为网格多点测量。技术改造后发现测点NO_x与烟囱出口NO_x数据变化趋势吻合,为进一步的按需喷氨提供了基础。
The nitrogen oxides emitted from coal-fired power plant boilers are an important air pollution source.Controlling NO_x emission has become an important work of power plants at present. The Shanghai Caojing power plant carried out the ultra-low emission transformation project in2014 and 2015 respectively. In the long run after retrofitting,it was found that the NO_x data of the selective catalytic reduction(SCR) outlet were large different from that of chimney outlet in unit one. Through the numerical simulation of the flow field in the flue where SCR is located,it is found that the original measuring points at the inlet and outlet of SCR can not accurately measure the concentration value of NO_x when the concentration distribution of NO_x at the inlet of the flue is not uniform. And so, the technical transformation was made that the original two-point average NO_x measurement at the SCR outlet was changed into the multi-point measurement of the grid. Finally, it is found that the change trend of the new NO_x data coincides with the NO_x data change trend of the chimney outlet, which provides the basis for the further injection of ammonia.
The nitrogen oxides emitted from coal-fired power plant boilers are an important air pollution source.Controlling NO_x emission has become an important work of power plants at present. The Shanghai Caojing power plant carried out the ultra-low emission transformation project in2014 and 2015 respectively. In the long run after retrofitting,it was found that the NO_x data of the selective catalytic reduction(SCR) outlet were large different from that of chimney outlet in unit one. Through the numerical simulation of the flow field in the flue where SCR is located,it is found that the original measuring points at the inlet and outlet of SCR can not accurately measure the concentration value of NO_x when the concentration distribution of NO_x at the inlet of the flue is not uniform. And so, the technical transformation was made that the original two-point average NO_x measurement at the SCR outlet was changed into the multi-point measurement of the grid. Finally, it is found that the change trend of the new NO_x data coincides with the NO_x data change trend of the chimney outlet, which provides the basis for the further injection of ammonia.
引文
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[4]时光,张杨,裴煜坤,等.某2?600 MW机组“W”火焰锅炉氮氧化物超低排放改造方案分析[J].发电技术,2017,38(3):6-9.
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[9]周昊.大型电站锅炉氮氧化物控制和燃烧优化中若干关键性问题的研究[D].杭州:浙江大学,2004.
[10]GBT 16157-1996.固定污染源排气中颗粒物和气态污染物采样方法[S].1996.
[11]董玉亮,袁家海,马丽荣.面向灵活性发电的燃煤机组大气排放特性分析[J].发电技术,2018,39(5):425-432.
[12]何建乐.某200MW循环流化床锅炉NOx排放试验研究[J].发电与空调,2017,38(05):22-25,15.
[13]唐树芳,唐郭安,喻小伟,等.六角切圆锅炉改造后NOx排放特性研究[J].发电技术,2018,39(6):533-536.
[14]王丰吉,王东,冯前伟.超低排放形势下CFB锅炉低氮燃烧和SNCR联合脱硝提效研究[J].发电与空调,2017,38(5):6-10.
[15]马彦斌,唐郭安,陈广伟,等.1000 MW电站锅炉SCR喷氨优化试验分析[J].发电与空调,2017,38(4):13-17.
[2]杨泽伦.SCR烟气脱硝工程设计原则与关键设计技术[J].中国电力,2015,48(4):27-31.
[3]杨延龙.火电厂氮氧化物减排及SCR烟气脱硝技术浅析[J].能源环境保护,2017,31(2):31-35,39.
[4]时光,张杨,裴煜坤,等.某2?600 MW机组“W”火焰锅炉氮氧化物超低排放改造方案分析[J].发电技术,2017,38(3):6-9.
[5]宋华伟,李允超,李凯.1000 MW超超临界燃煤锅炉低NOx燃烧优化试验研究[J].发电技术,2017,38(4):23-28.
[6]段传和,夏怀祥.燃煤电站SCR烟气脱硝工程技术[M].北京:中国电力出版社,2009.
[7]郭楠.SCR烟气脱硝系统运行技术规范研究[D].北京:清华大学,2015.
[8]赵乾.SCR烟气脱硝系统模拟优化及喷氨量最优控制[D].重庆:重庆大学,2012.
[9]周昊.大型电站锅炉氮氧化物控制和燃烧优化中若干关键性问题的研究[D].杭州:浙江大学,2004.
[10]GBT 16157-1996.固定污染源排气中颗粒物和气态污染物采样方法[S].1996.
[11]董玉亮,袁家海,马丽荣.面向灵活性发电的燃煤机组大气排放特性分析[J].发电技术,2018,39(5):425-432.
[12]何建乐.某200MW循环流化床锅炉NOx排放试验研究[J].发电与空调,2017,38(05):22-25,15.
[13]唐树芳,唐郭安,喻小伟,等.六角切圆锅炉改造后NOx排放特性研究[J].发电技术,2018,39(6):533-536.
[14]王丰吉,王东,冯前伟.超低排放形势下CFB锅炉低氮燃烧和SNCR联合脱硝提效研究[J].发电与空调,2017,38(5):6-10.
[15]马彦斌,唐郭安,陈广伟,等.1000 MW电站锅炉SCR喷氨优化试验分析[J].发电与空调,2017,38(4):13-17.