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煤气再燃有望成为一种有效的低污染燃烧方式得到广泛的使用。该文利用化学动力学模型对2种典型含氨煤气的脱硝反应特性进行了模拟研究。计算结果发现,再燃停留时间的延长可以显著提高再燃脱硝的效果,再燃停留时间应该大于1s才能取得较好的脱硝效果。同时,再燃温度越高,反应越迅速,脱硝效果越好。再燃区过量空气系数的降低对脱硝也有好处。煤气中的氨成分对煤气脱硝有一定的促进效果,而且随着反应温度的降低和再燃比例的增加,促进效果增强。含烃煤气与非烃煤气的再燃特性有很显著的差异,进行低NOx燃烧方式设计的时候应特别注意。
Gas reburning is expected to become an effective low-pollution combustion method is widely used. In this paper, the chemical kinetic model was used to simulate the denitrification characteristics of two typical ammonia-containing gases. The calculation results show that the extension of reburning residence time can significantly increase the effect of reburning denitration, and the residence time of reburning should be greater than 1s to obtain a better denitration effect. At the same time, the higher the reburning temperature, the faster the reaction and the better denitration effect. The reduction of excess air ratio in the reburning zone is also good for denitrification. The ammonia content in the gas has a certain promotion effect on the denitrification of the gas. With the decrease of the reaction temperature and the increase of the reburning ratio, the promotion effect is enhanced. There are significant differences between the reburning characteristics of hydrocarbon-containing gas and non-hydrocarbon gas. Special attention should be paid to the design of low NOx combustion mode.