BGL气化炉除CH_(4)的操作模拟研究

Mathematical modeling of CH_(4) elimination for BGL gasifier

氮肥行业中BGL气化技术应用前景好,但该技术生产的合成气中CH_(4)含量较高,无法满足合成氨原料要求。本研究充分考虑气化反应特性,拟在BGL气化炉设第二喷嘴,通过二次补燃的方式去除CH_(4)。进而,在已建立的新型BGL气化炉模型基础上,探究了二次补燃去除合成气中CH_(4)的效果。研究表明:补燃剂进料量为第一喷嘴进料量的25%时,出口气体中CH_(4)含量降至1%以下,且碳转化率大于99%。通过提高第一喷嘴进料蒸气比例可获得用于合成氨生产的高氢碳比合成气。

BGL gasification technology is promising in the nitrogen fertilizer industry.However,the syn-gas containing excessive CH_(4) produced by the BGL gasification cannot satisfy the demand for the synthetic ammonia process.In this work,a second nozzle was set in the BGL gasifier to eliminate CH_(4) via seconda-ry combustion.Then,the effect of secondary combustion was analyzed based on the proposed BGL gasifi-er model.It was found that the CH_(4) concentration was less than 1%and the char conversion was higher than 99%when the gasifying agent of the second nozzle was 25%of that of the first nozzle.The syngas with high H/C used for the synthetic ammonia process can be produced by increasing the steam propor-tion in the first nozzle.