循环流化床锅炉降低NO_x排放浓度试验与优化改造研究  

Research on Circulating Fluidized Bed Boiler NO_x Emissions Optimizing and Retrofit Design

作　　者：梁建红[1] 黄中[2] 

机构地区：[1]神华集团有限责任公司,北京100011 [2]中国华能集团清洁能源技术研究院有限公司,北京100098

出　　处：《锅炉技术》2015年第2期55-59,共5页Boiler Technology

基　　金："十二五"国家科技支撑计划"CFB锅炉燃用难燃煤种的研究"项目(2012BAA02B02)

摘　　要：NOx排放浓度低是循环流化床锅炉的主要优点之一,但国内一些循环流化床锅炉的NOx排放浓度不能满足《火电厂大气污染物排放标准》(GB 13223—2011)的要求,给电厂的环保、经济运行带来了不利影响。在研究分析了各种影响循环流化床锅炉NOx排放浓度的运行控制因素后,对循环流化床锅炉进行了降低NOx排放浓度的燃烧优化调整试验。结果显示:NOx排放浓度会随氧量、一次风率、床温的增加而增加,同时其还与上、下二次风比例、SO2排放浓度有关联。对于NOx排放浓度较高的循环流化床锅炉,可以采取二次风系统改造、增加烟气再循环措施,必要时增加SNCR脱硝系统。Low density of NOxemission is one of the advantages of Circulating Fluidized Bed boiler.However,some of the domestic CFB boilers cannot meet the requirement of（ Emission standard of air pollutants for thermal power plants）（ GB 13223—2011）,which impact the operating of power plant. The article analyzed operating control factors that impact the NOxemission density of CFB boiler throughout optimizing experiments designed to decrease the NOxemission density. As the results showed,the NOxemission density increased with oxygen、primary air、bed temperature,and is also related to the secondary air、SO2emission density. For CFB boilers with high NOxemission density,solution includes reforming secondary air system、adding gas recycling system and adding SNCR system when necessary.

关 键 词：循环流化床锅炉 烟气 NOx浓度 试验 优化 改造 

分 类 号：TK229.66[动力工程及工程热物理—动力机械及工程]