燃烧优化调整对NO_x排放和锅炉效率的影响  

Effect of combustion optimization adjustment on NO_x emission and boiler efficiency

作　　者：蔡培 葛荣存 葛铭 陈辉 陈国庆 王秀军 戴维葆 CAI Pei;GE Rongcun;GE Ming;CHEN Hui;CHEN Guoqing;WANG Xiujun;DAI Weibao(Key Laboratory for Clean and Efficient Coal-Fired Power Generation and Pollution Control,Guodian Science and Technology Research Institute,Nanjing 210023,China)

机构地区：[1]国电科学技术研究院清洁高效燃煤发电与污染物控制国家重点实验室,江苏南京210023

出　　处：《洁净煤技术》2018年第5期77-83,共7页Clean Coal Technology

基　　金：中国国电集团公司科技项目(D2017Y006)

摘　　要：为研究燃烧调整对NO_x排放和锅炉效率的影响,在330 MW煤粉炉机组满负荷运行工况下,通过调整过量空气系数、SOFA风开度、二次风配风方式、周界风开度以及燃烧器摆角,测定了尾部烟道SCR入口A、B两侧的NO_x排放浓度及其相关数据,并计算得到锅炉效率,研究了各因素对NO_x排放浓度和锅炉效率的影响。结果表明,运行氧含量较低时能降低NO_x浓度并保证较高的锅炉效率;倒塔配风的NO_x排放浓度比正塔配风和均等配风分别低约9.1%和7.8%,倒塔配风最低,正塔配风最高;锅炉效率随着SOFA风开度的减小呈先上升后下降趋势,而NO_x浓度呈递增趋势;随着周界风开度的逐渐增大,锅炉效率先减小后增加,而NO_x排放逐渐增大,周界风开度变化7%,锅炉效率变化1%左右;随着燃烧器摆角的增加锅炉效率先呈上升后呈下降趋势,而NO_x浓度呈下降趋势。In order to study the effect of combustion optimization adjustment on NOx emission and boiler efficiency,the NOx emission concentration of tail flue in A and B sides was measured by adjusting the excess air coefficient,SOFA wind opening,secondary air distribution mode,surrounding air opening and burner swing angle.Besides,the boiler efficiency was calculated by recording the related data of DCS and collecting samples.Effect of combustion optimization adjustment on NOx emission and boiler efficiency was researched.The results show that NOx concentration can be reduced and higher boiler efficiency can be guaranteed by decreasing oxygen contents.The NOx emission concentration of inverted tower is 9.1% and 7.8% lower than the normal tower and equal distribution wind,respectively.The inverted tower is the lowest and normal tower is the highest.The boiler efficiency increases with the increase of SOFA wind opening and later slightly decreases,while the concentration of NOx increases with the increase of SOFA wind opening.With the increase of surrounding air opening,boiler efficiency firstly decreases and then increases,while the NOx emissions increases gradually.The boiler efficiency changes about 1% with surrounding air opening increasing 7%.The boiler efficiency firstly increases and then decreases with the increase of burner swing angle.

关 键 词：NOX排放 燃烧优化调整 锅炉效率 电站锅炉 过量空气系数 配风方式 

分 类 号：TK227.1[动力工程及工程热物理—动力机械及工程]