摘要
喷氨量的精确控制是电站选择性催化还原(SCR)脱硝系统的关键问题,控制不当会影响火电厂脱硝效率或氨逃逸形成二次污染,建立准确的SCR脱硝系统动态过程模型是开发先进喷氨控制器的基础。本文通过分析电站工业SCR脱硝催化剂和实验用催化剂与烟气反应特性的不同,对经典SCR脱硝过程反应动力学模型进行了改进,建立了适用于燃煤电站SCR脱硝动态过程的机理模型,并与经典SCR脱硝反应机理模型进行对比,分析了改进模型在变工况时入口NOx质量浓度、烟气流量等因素剧烈波动时模型特性。结果表明,改进模型计算精度和适应性更好,且在稳定工况和变工况均明显优于原机理模型。
Precise control of ammonia injection is an important technology in selective catalytic reduction(SCR)denitrification system in power stations.Inaccurate control will reduce the denitrification efficiency or cause secondary pollution of ammonia and even block the air preheater.Establishing an accurate dynamic model for the SCR denitraiton system is the basis for development of advanced ammonia controllers.By analyzing the difference between the reaction characteristics of the SCR denitration catalyst with flue gas in power plants and those in laboratory,classical kinetic equations of the SCR denitrification were improved.The dynamic mechanism model of the SCR denitrification in coal-fired power stations was established and compared with the model based on classic kinetic equations.Finally,the characteristics of the improved model under unstable conditions with the inlet NOx concentration and the flue gas flow rate fluctuate greatly are analyzed.The results show that,this improved model has better accuracy and adaptability under both stable and unstable operating conditions.
作者
饶德备
谭鹏
李壮扬
胡昌镁
曹楠
张成
方庆艳
陈刚
RAO Debei;TAN Peng;LI Zhuangyang;HU Changmei;CAO Nan;ZHANG Cheng;FANG Qingyan;CHEN Gang(State Key Laboratory of Coal Combustion,HuazhongUniversity of Science and Technology,Wuhan 430074,China;Shajiao C Power Plant of Guangdong Energy Group Co.,Ltd.,Dongguan 523900,China)
出处
《热力发电》
CAS
北大核心
2019年第8期36-41,共6页
Thermal Power Generation
基金
国家重点研发计划项目(2018YEB0605105)
中国博士后科学基金(2018M632852)~~
关键词
燃煤电站
烟气脱硝
SCR
机理建模
催化剂
喷氨优化控制
coal-fired power plant
flue gas denitrification
SCR
mechanism modeling
catalyst
ammonia injection optimization
