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为了研究炉内偏转二次风对燃煤过程中颗粒物生成的影响,通过建立与炉内三维气相流动控制方程一致的亚微米颗粒数量和质量控制方程,运用CFD软件模拟了NaOH颗粒在100 MW锅炉内的生成特性.结果显示:二次风偏转实现了炉内空气水平分级,降低了炉内峰值温度、缩小了高温区域,减少了矿物质气化量,进而在一定程度上抑制亚微米颗粒的生成.中间两层二次风偏转10°后,峰值温度比正常运行工况下的峰值温度约低30 K,NaOH颗粒质量浓度有一定下降.
In order to study the influence of deflected secondary air in the furnace on the generation of particulate matter in the process of coal combustion, by establishing the submicron particle quantity and quality control equation consistent with the three-dimensional gas flow control equation in the furnace, the CFD software was used to simulate the effect of NaOH particles on 100 MW boiler The results show that the deflection of the secondary air realizes the classification of the air in the furnace, reduces the peak temperature in the furnace, narrows the high temperature region, reduces the amount of gasification of the mineral, and then suppresses the submicron particles to a certain extent Generated.When the two intermediate layers of secondary air deflected 10 °, the peak temperature was about 30 K lower than the peak temperature under normal operating conditions, and the concentration of NaOH particles decreased to some extent.