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基于变工况运行,采用计算流体力学(CFD)模拟方法,对某电厂1000MW超超临界锅炉炉膛内CO、O_2、NO浓度场和温度场进行计算和分析.影响该锅炉NO_x排放浓度主要运行因素有燃用煤质、附加风量(AA风量)和过剩空气系数等.CFD数值模拟计算结果表明:锅炉通过合理组织炉内燃烧,实现了主燃烧区的较均匀的温度分布,主燃区的燃烧方式属于还原态燃烧方式;大量AA风的深度空气分级燃烧和锅炉低过量空气系数的有机结合及PM燃烧器的应用是该型锅炉NO_x排放浓度低的主要原因.
Based on variable operating conditions, the concentration and temperature fields of CO, O_2 and NO in the 1000MW ultra-supercritical boiler in a power plant were calculated and analyzed by computational fluid dynamics (CFD) simulation method.The main influencing factors of NO_x emission concentration Burned coal quality, additional air volume (AA air volume) and excess air coefficient, etc. The CFD numerical simulation results show that the boiler can achieve a more uniform temperature distribution in the main combustion zone by reasonably organizing the combustion in the furnace, and the combustion in the main combustion zone The way belongs to the reduction combustion mode; the combination of the deep air staged combustion of a large number of AA winds and the low excess air coefficient of the boiler and the application of the PM burner are the main reasons for the low concentration of NO_x in the boiler.