摘要
随着国家对环保标准的日益严格,要求燃煤机组必须具有脱硝能力,并且保证烟气NOx排放浓度符合环保要求。针对脱硝装置投入运行后,由于存在氨逃逸,造成空气预热器经常结垢堵塞,提出增装选择性催化还原(SCR)烟气脱硝装置智能优化控制系统,通过多输入、多输出模型预算功能,提高脱硝装置自动控制系统的调节品质,在符合环保要求的前提下,合理控制喷氨量,减少氨逃逸量;在空气预热器出现积灰微堵现象时,将原有的在线程控吹灰方式改为手动定向吹灰,对积灰部位重点吹扫,降低空气预热器堵塞的风险,这两项措施的实施,有效地降低了增装脱硝装置后空气预热器的堵塞问题。
Along with the state＇s environmental protection standards becoming increasingly stringent,coal-fired units are required to install denitrific ation devices to ensure that the flue gas NOx emission concentration complies with the environmental standards.In this paper,aiming at the frequent scaling and blocking of the air preheater due to the ammonia slipping after the denitrification devices being put into use,the intelligent optimization system is proposed for the SCR denitrafication device to improve the control quality of the denitrafication control system through the budget function of the multi-input and multi-output model,which can reasonably control the ammonia injection volume and reduce the amount of ammonia slip on the premise of meeting the environmental standards.In addition,when slight air preheater fouling blockage occurs,the original online program control soot blowing mode is changed to the manual directed soot blowing mode which focuses on the fouling areas to reduce the risk of blocking the air preheater.The two measures effectively reduce the occurrence of the air preheater blocking problem caused by the operation of the denitrafication device.
出处
《中国电力》
CSCD
北大核心
2014年第9期29-34,共6页
Electric Power
关键词
SCR
脱硝控制系统
智能优化系统
NOx
空气预热器
SCR
denitrification control system
intelligent optimization system
NOx
air preheater
