加热炉换向阀换向时，烧嘴内滞留煤气和炉膛烟气一起被抽走排出，造成烟气中CO含量高,而且在烧嘴内形成高温区，使蜂窝蓄热体烧融、烧裂，使用寿命缩短。二次燃烧系统采用PLC换向装置，将一部分废烟气抽出，利用抽出的这部分废烟气将烧嘴内滞留煤气吹扫至炉内，进行二次燃烧。获得收益如下：二次燃烧系统使煤气的燃烧率达到90%以上，加热炉热效率达到71%以上。蓄热体使用寿命从10个月延长到18个月。大幅度地回收烟气中的CO，每年减少CO排放量接近0.2亿m3，达到环保效果。
The gas in burner and the fume in hearth was pumped and discharged after the valve for the furnace reversed. In this situation, the higher content of CO in the flue gas and the higher temperature in heat accumulator could lead to the burning melt， cracked and life-span shortened. Secondary combustion technology with PLC reversing apparatus can partly pump the flue gas, which can be used to flush the gas in burner into the furnace re-combustion before it is discharged. The technology’s advantages are as follows.The combustion ratio over 90%, and heat efficiency of heating-furnace over 71%; extend the life of heat accumulator from 10months to 18mouths. Recover the CO of fume and reduce emissions of CO nearly 10×107 m3 per year to achieve environmental control.
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