600MW墙式燃烧锅炉氮氧化物排放浓度与主要运行因素的多元线性回归研究  

Study of a Multivariable Linear Regression of the NOx Emissions Concentration and Main Operating Factors of a 600 MW Wall-type Boiler

作　　者：沈跃云[1] 高小涛[2] 孟硕 

机构地区：[1]江苏经贸职业技术学院,江苏南京211168 [2]江苏省电力试验研究院有限公司,江苏南京211103 [3]哈尔滨锅炉压力容器检验研究院,黑龙江哈尔滨150078

出　　处：《热能动力工程》2011年第6期726-731,776-777,共6页Journal of Engineering for Thermal Energy and Power

基　　金：国家杰出青年科学基金资助项目(50825902);江苏省自然科学基金攀登基金资助项目(BK2009218)

摘　　要：以某厂600 MW超临界机组前后墙布置燃烧器锅炉为研究对象,采用现场燃烧调整试验方法,针对锅炉燃烧系统的运行特点和具体条件,进行了氧量、燃烧结构参数(包括一次风速、中心风量、二三次风风量和二次风旋流强度等)、磨煤机运行组合方式、燃尽风量和煤质变化等影响锅炉氮氧化物(NOx)排放特性的试验研究。试验结果表明:锅炉的运行氧量、磨煤机组合投运方式变化、燃尽风量和煤质变化是锅炉NOx排放浓度的主要影响因素,影响NOx排放浓度变化幅度达到14%～18%;而燃烧器结构参数的变化影响较小;通过对主要因素的控制,可以显著降低锅炉NOx排放浓度。在此基础上,应用多元线性回归方法,建立了该600 MW锅炉NOx排放浓度与主要运行因素的回归经验关系式,回归经验关系式的预测值和实测值之间的偏差大多在%10%范围内,该经验关系式可用于锅炉NOx排放浓度的在线运行控制和预测。With a 600 MW supercritical boiler unit serving as an object of study,of which the burners are arranged on the front and rear wall,by adopting an on-site combustion adjustment test method and in the light of the operation features and concrete conditions of the combustion system of the boiler,experimentally studied was the influence of various factors on the NOx emissions characteristics of the boiler.They include: oxygen quantity,combustion structural parameters(including primary air speed,central air quantity,secondary and tertiary air quantity and secondary air swirling intensity etc.),mill operation combination mode,overfired air quantity,coal quality change etc.The test results show that the operation air quantity,mill operation combination mode,overfired air quantity and coal quality change of the boiler constitute the main factors influencing its NOx emissions concentration and such an influencing extent can attain as high as 14% ~18% while the change of the structural parameters of the burners have a relatively small influence.Through controlling the main influencing factors,the NOx emissions concentration of the boiler can be markedly lowered.On this basis,by utilizing a multivariable regression method,an empirical regression formula governing the NOx emissions concentration and main operation factors of the boiler was established.In most cases,the deviation between the value predicted by using the above-mentioned formula and the actually measured one is within in a range of ±10%,indicating that the formula can be used for on-line operation control and prediction of NOx emissions concentration of a boiler.

关 键 词：超临界锅炉 墙式燃烧系统 低NOX排放 运行因素 多元线性回归 

分 类 号：X511[环境科学与工程—环境工程]