燃煤锅炉烟气工艺的设计与应用

Technology Design and Application of Flue Gas from Coal-f ired Boiler

基于超低排放的严格控制,文章以某燃煤锅炉烟气为设计案例,采用布袋除尘器+臭氧脱硝+石灰石石膏法+湿式电除尘器净化工艺,对燃煤烟气进行脱硫脱硝除尘。经处理后,SO_(2)≤35 mg/Nm^(3),粉尘≤5 mg/Nm^(3),NO_(x)≤50 mg/Nm^(3)。运行过程中考察O_(3)与NO之间摩尔数的比值(O_(3)/NO)对脱硝效率及湿电出口粉尘浓度的影响。结果发现,随着O_(3)/NO的增加,脱硝效率增加,O_(3)/NO大于1.6以后,几乎不在增加,更多的会转化为气溶胶颗粒,增加粉尘的出口浓度。

Based on the strict control of ultra-low emission,this paper takes the flue gas of a coal-f ired boiler as a design case,and adopts the bag dust collector+ozone denitrif ication+limestone gypsum+wet electrostatic precipitator purif ication process to carry out desulfurization and denitrif ication dust removal of coal-f ired flue gas.After treatment,SO_(2)≤35 mg/Nm^(3),dust≤5 mg/m^(3),NO_(x)≤50 mg/Nm^(3).The influence of the molar number ratio between O3 and NO(O_(3)/NO)on the denitration eff iciency and the dust concentration at the wet electricity outlet was investigated during the operation.The results show that with the increase of O_(3)/NO,the denitrif ication eff iciency increases.When O_(3)/NO is greater than 1.6,it almost does not increase,and more will be converted into aerosol particles,increasing the exit concentration of dust.