烟气再循环率对炉内燃烧及NOx生成特性的影响

Effect of Flue Gas Recirculation Rate on Combustion and NOx Formation Characteristics in Furnace

本文以某电厂660MW实际运行的二次再热机组为研究对象,重点研究再循环烟气对炉内燃烧特性的影响,通过模拟计算确定典型工况下的最佳烟气再循环率。该模拟的内容包括,炉膛温度分布特性,组分分布特性,氮氧化物生成特性,再循环烟气率对各级受热面蒸汽参数的特性影响,为二次再热超超临界机组运行性能优化提供参考依据。

In this paper,the secondary reheat unit of 660 MW in a power plant is taken as the research object.The influence of recycled flue gas on the combustion characteristics of the furnace is studied.The optimal flue gas recirculation rate under typical conditions is determined by simulation.The simulation includes the furnace temperature distribution characteristics,composition distribution characteristics,nitrogen oxide generation characteristics,and the influence of the recycled flue gas rate on the steam parameters of the heating surfaces at all levels,which is optimized for the operation performance of the secondary reheat ultra-supercritical unit.Provide a reference basis.