摘要
对某电厂1 000MW超超临界塔式锅炉进行了燃烧优化调整试验,分析了省煤器出口O2体积分数、机组负荷、二次风配风方式、紧凑燃尽风(CCOFA)风量、分离燃尽风(SOFA)风量及磨煤机组合方式等因素对锅炉燃烧及NOx排放特性的影响.结果表明:省煤器出口O2体积分数和机组负荷对锅炉热效率和NOx排放质量浓度有较大的影响;随着省煤器出口O2体积分数的增加,NOx排放质量浓度显著上升;随着机组负荷的降低,NOx排放质量浓度先降低后升高,锅炉热效率则先升高后降低;通过设置合理的二次风配风方式、CCOFA和SOFA风量比例以及磨煤机组合方式,既可以提高锅炉热效率又可以降低NOx排放质量浓度.
A series of experiments on combustion optimization and adjustment were conducted for a 1 000 MW ultra supercritical tower type boiler, so as to analyze the effects of following factors on the boiler combustion and NOx emission, such as the oxygen volumetric fraction at economizer outlet, unit load, sec ondary air distribution mode, flow rate of close coupled over-fire air （CCOFA）, flow rate of separated o ver-fire air （SOFA）, and the combination mode of coal mills, etc. Results show that the oxygen volumet ric fraction and unit load have great influence on both the boiler efficiency and NO. emission. With the rise of oxygen volumetric fraction, the mass concentration of NOx emission increases significantly; whereas with the reduction of unit load, the NOx emission drops fir increases first and decreases later on. Not only the boiler e mission may be reduced, by reasonably setting the distrib CCOFA and SOFA, and the combination mode of coal mill st and rises later on, while the fficiency may be improved, but ution mode of secondary air, S, boiler efficiency also the NOX e the flow rate ofCCOFA and SOFA, and the combination mode of coal mills.
出处
《动力工程学报》
CAS
CSCD
北大核心
2014年第3期169-175,195,共8页
Journal of Chinese Society of Power Engineering
关键词
超超临界塔式锅炉
燃烧调整
NOX排放
锅炉热效率
ultra supercritical tower type boiler
combustion adjustment
NOx. emission
boiler efficiency
