660MW超超临界机组运行方式对SCR系统氨逃逸率的影响  

Effects of Boiler Control Mode on Ammonia Escape of the SCR System in a 660 MW Ultra-supercritical Unit

作　　者：杨建国[1] 胡劲逸[1] 赵虹[1] 万朝晖 康科伟 陈理帅 周霭琳[1] 

机构地区：[1]浙江大学能源清洁利用国家重点实验室,杭州310027 [2]浙江浙能乐清发电有限责任公司,浙江乐清325609

出　　处：《动力工程学报》2015年第6期476-480,共5页Journal of Chinese Society of Power Engineering

基　　金：浙江省自然科学基金资助项目(LY15E060002)

摘　　要：以某台660MW超超临界机组为例,通过燃烧调整及SCR运行调整,研究了主要运行参数对氨逃逸率的影响.结果表明:氨逃逸率随着脱硝效率提高而提高,当脱硝效率高于设计值(65%)时,氨逃逸率上升幅度增大;SCR入口NOx质量浓度存在一个最佳值(约200mg/m3)使得氨逃逸率最低,最佳的燃尽风率和最佳氧体积分数分别为18%和3%,过高的燃尽风率或过高的氧体积分数对氨逃逸率的影响尤其显著;在额定机组负荷下,氨逃逸率较高,而机组负荷在500 MW及以下时,氨逃逸率总体降低约60%.The experimental tests were carried out to a 660 MW ultra-supercritical unit to study the effects of boiler control mode on the ammonia escape.Results indicate that the ammonia escape rate would increase with the rise of denitration efficiency.Especially when the denitration efficiency is higher than 65%(designed value),the increasing rate would be larger.The NOxconcentration at SCR's inlet has an optimum value(about 200mg/m3)to corresponding the lowest ammonia escape rate.The ammonia escape rate would increase obviously with higher SOFA rate(optimum value is 18%)or oxygen concentration(optimum value is 3%),which would decrease with the reduction of unit load.When the unit load drops to 500 MW or lower,the ammonia escape rate would decrease by about 60%.

关 键 词：超超临界机组 SCR 氨逃逸率 燃尽风率 脱硝效率 

分 类 号：TM621[电气工程—电力系统及自动化]