1000MW机组锅炉NOx排放浓度与主要运行因数的多元线性回归

以某电厂1000 MW超超临界双切圆燃烧锅炉为研究对象,采用现场燃烧调整试验方法,进行了氧量、负荷、燃尽风量、主燃烧区燃烧器风量和配风方式、磨煤机运行组合方式、燃烧器摆角、煤质等因素对锅炉NOx排放影响的试验研究.试验研究结果表明:对于具有先进低NOx燃烧系统的锅炉,煤质因素是NOx排放浓度的主要影响因素之一；运行氧量...

Empirical Correlations by Multiple Linear Regression between NOx Emission Concentration and Main Operation Factors in 1 000 MW Utility Boilers

The NOx emissions of the double tangential firing boiler in 1 000 MW ultra-supercritical unit are systematically investigated based on on-site combustion tuning tests,on which the effects of excess oxygen level,boiler load,quantities of over-fired airs,burner air amount and distribution of the main combustion zone,mill groups in service,burner tilting angle,and coal property are studied.For the boiler equipped with advanced low-NOx combustion system,it is shown from the tests that the coal property,excess oxygen level and boiler load are important factors affecting NOx emission.The NOx emission increases linearly with increasing oxygen level.However,the burner air amount and distribution of the main combustion zone have weak influences on NOx emission concentration when multi-level combustion is achieved by keeping large quantity of over-fired airs.Based on this,the empirical correlations between NOx emission concentration and main operation factors are established by multiple linear regression,which can be applied to predict the boiler NOx emissions and guide NOx combustion control during operation.