CAJ | 학술논문

为研究燃尽风(OFA)技术对 NOx 生成量、燃烧及脱硝总成本的影响,以某300 MW 机组锅炉为对象,采用支持向量机法,建立了输入量为机组负荷、一、二次风量、各层二次风挡板开度以及 OFA 挡板开度等,输出量为 NOx 生成量、耗煤量、脱硝效率的关系模型。利用该模型分析在保持总风量不变的条件下,改变 OFA 挡板开度对燃烧及脱硝总成本的影响,并以实际运行数据对其进行验证。结果表明：机组在50％~75％以及87％~100％2个负荷段,随着 OFA挡板开度增大,NOx 生成量下降,耗煤量上升,燃烧及脱硝总成本略有上升；在75％~87％负荷段,随着 OFA 挡板开度增大,NOx 生成量也呈下降趋势,而耗煤量基本保持不变,燃烧及脱硝运行成本略有下降。
위연구연진풍(OFA)기술대 NOx 생성량、연소급탈초총성본적영향,이모300 MW 궤조과로위대상,채용지지향량궤법,건립료수입량위궤조부하、일、이차풍량、각층이차풍당판개도이급 OFA 당판개도등,수출량위 NOx 생성량、모매량、탈초효솔적관계모형。이용해모형분석재보지총풍량불변적조건하,개변 OFA 당판개도대연소급탈초총성본적영향,병이실제운행수거대기진행험증。결과표명：궤조재50％~75％이급87％~100％2개부하단,수착 OFA당판개도증대,NOx 생성량하강,모매량상승,연소급탈초총성본략유상승；재75％~87％부하단,수착 OFA 당판개도증대,NOx 생성량야정하강추세,이모매량기본보지불변,연소급탈초운행성본략유하강。
To improve the unit economy,the effects of using over fire air (OFA)technology on NOx forma-tion,furnace combustion and denitrification costs were investigated.Taking a 300MW unit boiler as the re-search object,the support vector machine (SVM)theory was applied to establish a mathematic model.In this model,the input variables are unit load,the primary and secondary air volume,the opening degree of the secondary air damper in each layer and the OFA damper opening degree.The output variables are the NOx formation,coal consumption and denitrification efficiency.The change rules between the OFA damper opening degree and the costs of combustion and denitrification were studied,on the premise of a constant total air volume.Moreover,the calculation results were verified by the actual operation data.The results show that,in the 87% to 100% load stage and 50% to 75% load stage,the NOx formation decreased and the coal consumption increased with the increasing OFA damper opening degree,and the combustion and denitrification costs increased a little.In the 75% to 87% load stage,the NOx formation decreased while the coal consumption tended to be stable with the increasing OFA damper opening degree,and the combustion and denitrification costs decreased slightly.