Analysis on the Influence of Coal Properties on NOx Emissions of Large-scale Boilers Equipped with Advanced Low-NOx Combustion Systems
The fast development and application of low-NOx combustion technologies have significantly influence on the operation performance of coal-fired utility boilers.With the application of advanced low-NOx combustion technologies,the characteristics of NOx emissions from pulverized coal-fired furnace and the trends of various factors influencing on the emissions may also be different from understandings from the experiences of using the previous technologies.It is well known that coal properties are among the most important factors to affect NOx emission levels.However,the modem low NOx combustion technologies are all based on controlling coal particle combustion process but fitting with the properties of the fired coals.Therefore,the influence of coal properties on NOx emissions of modern largescale boilers,particularly those equipped with advanced low-NOx combustion systems,is worthy of a further study. In the present work,extensive in-situ measured NOx emission data as well as coal properties of more than 40 pulverized coal-fired units with the installed capacity of 300 - 1000 MW were collected and analyzed to establish the correlation between NOx emission and coal properties.When comparing the impacts of coal volatile content and N content on NOx emission concentrations between different boilers,it was found that,for the boilers burning high volatile bituminous coals,the impacts of coal properties on the NOx emissions of the boilers equipped with advanced lowNOx combustion systems are not long significant.When considering coal properties impact on a certain boiler equipped with advanced low-NOx combustion system,its NOx emission was found in general to decrease with the increases of the coal N and volatile contents.It implies that,for a certain boiler considered,coal properties are still the main factor influencing the NOx emission concentration.The present work presented the further understanding of the influence of coal quality on NOx emission of modern pulverized coal-fired boilers.The data and results will be detailed in the full manuscript.
Pulverized coal fired boilers low NOx combustion NOx emission coal properties
Shen Yue-yun Gao Xiao-tao Zhang Ming-yao
Jiangsu Institute of Economic & Trade Technology,Nanjing 211168,China Jiangsu Electric Power Test and Research CO.,LTD.Nanjing 211103,China School of Energy and Environment,Southeast University,Nanjing 210096,China
国际会议
The 7th International Symposium on Coal Combustion(第七届国际煤燃烧学术会议)
哈尔滨
英文
702-705
2011-07-19（万方平台首次上网日期，不代表论文的发表时间）