摘要
NOx的排放量是火电污染控制的关键指标之一,为达到现役火电机组NOx排放量不超过50mg/Nm3的超低排放标准,循环流化床(CFB)火电机组通常使用SNCR、SCR或两者结合的方式脱除NOx。针对某热电厂CFB锅炉在选择非催化还原(SNCR)尿素脱硝技术中存在的大迟延、非线性、时变等问题,通过相关系数法遴选出影响NOx最大的三个因素,即有功功率、锅炉出口烟气含氧量、石灰石投入量作为生成量计算标准,构建出NOx变化率上升与下降时的多因素动态叠加控制方案,并在该电厂进行工程实际应用。实际运行效果表明,该脱硝自动控制方案能够有效解决传统脱硝控制的大延时和大滞后问题,具有一定的实用价值。
The emission of NO x is one of the key indicators of thermal power pollution control.In order to achieve the ultra-low emission standard of NO x in active thermal power units,circulating fluidized bed(CFB)thermal power units usually use SNCR,SCR or a combination of both to remove NO x.In order to solve the problems of large delay,non-linearity and time variation in the selection of non-catalytic reduction(SNCR)urea denitrification technology for a CFB boiler in a thermal power plant,three factors affecting NO x are selected by correlation coefficient method,to use the active power,flue gas oxygen at boiler outlet and limestone input as the calculation standard,and a multi-factor dynamic superposition control scheme is constructed when the change rate of NO x rises and decreases.And the practical application is carried out in the power plant.The actual operation results show that the denitrification automatic control scheme can effectively solve the problem of large time delay and large delay of traditional denitrification control,and has a certain practical value.
作者
胡金彪
李丽锋
石晶晶
王琦
袁宇田
张海伟
荣澔洁
朱竹军
杨超杰
HU Jin-biao;LI Li-feng;SHI Jing-jing;WANG Qi;YUAN Yu-tian;ZHANG Hai-wei;RONG Hao-jie;ZHU Zhu-jun;YANG Chao-jie(Shanxi Pingshuo Power Generation Co.,Ltd.,Shuozhou 036800,China;Shanxi Hepo Power Generation Co.,Ltd.,Yangquan 045011,China;Shanxi University,Taiyuan 030013,China;Shanxi Gemeng Sino US clean energy R&D Center Co.,Ltd.,Taiyuan 030000,China)
出处
《电力学报》
2020年第5期450-456,共7页
Journal of Electric Power
关键词
CFB
NO_x脱除
相关系数法
多因素
动态叠加
CFB
NO x removal
correlation coefficient method
multiple factors
dynamic superposition
