600 MW四角切圆锅炉分级燃烧数值模拟与试验研究

Numerical Simulation and Experimental Research on Staged Combustion in a 600 MW Tangentially-fired Boiler

针对某电厂600 MW四角切圆锅炉炉膛出口NOx含量高的问题,采用了两级空气分级燃烧技术,并对燃烧特性进行模拟优化与现场试验。结果表明:两级空气分级对燃尽区氧量造成了明显的影响;对锅炉进行燃烧优化调整后,锅炉效率没有降低,飞灰和炉渣含碳量没有增加,烟气在炉膛上部可以较为均匀地混合。

To solve the problem of high NOx concentration at the furnace outlet of a 600 MW tangentially-fired boiler,the two-stage combustion technology was adopted,based on which,simulation optimizations and field tests were conducted on the combustion characteristics of the boiler.Results show that the two-stage combustion technology has a significant effect on the oxygen content in the burnout zone.After taking combustion adjustments,the boiler efficiency remains unchanged,the carbon content in both the fly ash and the slag keeps stable,and the flue gas gets evenly mixed in the upper furnace.