再燃对NO_x污染物排放影响研究

Study of the Impact on NO_x Emission Caused by Reburning

NO_x是燃煤电厂的重要污染物,论文在滴管炉内研究再燃对这种污染物排放的影响规律。结果表明,针对选用的再燃燃料,CH_4脱硝率最高,H_2脱硝率次之,CO脱硝率最低,不同碳氢比合成气再燃脱硝效率随碳氢比的增大先上升后下降,碳氢比7/3时,脱硝效率较好,但低于甲烷再燃脱硝效率。当再燃区过量空气系数为0.7~0.9、温度在1200℃左右时,合成气再燃可以获得比较理想的再燃脱硝效果。该结论可为锅炉煤粉燃烧过程中,NO_x脱除提供理论基础。

NOx is the important pollutants in the coal - fired power plants. This paper focuses on the impact of these pollutant caused by reburning in the drop - tube furnace. The results show that for denitration, the rate t of CH4 reburning denitration is the highest,the next is the H2 and CO is the lowest,the reburning denitration rate of syngas with the different carbon hydrogen ratio increases firstly, and then decreases along with the increase of the carbon hydrogen ratio. When the carbon hydrogen ratio reaches to 7/3 ,the reburning denitration rate is higher, but lower than that of the methane. When the excess air coefficient of reburing zone is between 0.7 and 0.9, and the temperature is about 1200℃, the reburning process of the syngas can obtain ideal reburning denitration effect. This conclusion can provideprovide the theoretical foundation for NOx removal in the coal combustion of power station boile.