空气分级燃烧中灰含量对烟煤NO_x排放特性的影响

Influence of Ash Content on NO_x Emission Characteristics of Bituminous Coal in Air Stage Combustion

在多路进风一维热态实验炉上,研究低灰分神华烟煤和高灰分的临汾烟煤的不同粒径在空气分级燃烧条件下NOx的排放特性.结果表明,神华烟煤和临汾烟煤在不分级燃烧时的NOx排放量都随过量空气系数增大而增加,但相对于神华烟煤,高灰分临汾烟煤燃烧的NOx排放量变化较小;空气分级燃烧技术对低灰分煤种有明显的NOx减排效果,而对高灰分煤种效果不明显.

Investigations on air staging combustion of low ash Shenhua pulverized coal and high ash Linfen pulverized coal of different particle size were carried out with a multipath air inlet furnace.The result shows that both Shenhua and Linfen NOx concentrations increase as the excess air coefficient gets larger.But the NOx concentration of high ash pulverized coal increases more slowly than that of low ash pulverized coal.Air staging combustion has a more obvious effect on low ash content than on high ash content.As the over fire air ratio increases,the NOx concentration of Shenhua coal increases rapidly,while that of Linfen coal changes little.