催化滤袋脱硝性能及垃圾焚烧烟气的协同净化

Denitration performance of catalytic filter bag and synergistic purification of waste incineration flue gas

针对催化滤袋用于垃圾焚烧烟气脱酸、脱硝、除尘协同净化的技术思路,建立了协同净化实验系统,首先在烟气脱酸的前提下实验研究了关键因素对催化滤袋脱硝性能的影响,然后选取优化参数进行了协同净化实验。结果表明,在180~220℃的催化剂适用温度范围内的脱硝效率变化量约为15%,每提高10℃,氨逃逸体积分数下降约0.9μL/L,150℃时脱硝效率和氨逃逸体积分数均严重偏离需求值;分别增加氨氮摩尔比0.1 mol/mol、烟气含水率5%、入口NOx质量浓度100 mg/m3、过滤风速0.1 m/min,脱硝效率的变化量分别约为4.1%、-2.6%、2.7%、-1.7%,氨逃逸体积分数变化量分别约为1.9、0.5、2.3、0.6μL/L;脱酸脱硝协同净化时,在碱酸比1.1 mol/mol条件下,HCl脱除效率基本稳定在96%左右,SO2脱除效率达到97%以上且随氨氮摩尔比增加而略有增长趋势;氨氮摩尔比1 mol/mol以上时脱硝效率可以达到70%以上,氨氮摩尔比每增加0.1 mol/mol,脱硝效率增加约3.2%,氨逃逸体积分数增加约3.1μL/L。

Aiming at the technical idea of catalytic filter bag for synergistic purification of waste incineration flue gas deacidification,denitration and dedust,a synergistic purification experimental system was established.The effects of key factors on the denitration performance of catalytic filter bag were studied under the premise of waste incineration flue gas deacidification.Then the optimized parameters were selected to carry out the synergistic purification experiments.The results show that the denitration efficiency changes by about 15%within the applicable temperature range of 180-220℃.The ammonia escape decreases by about 0.9μL/L for every 10℃increase.At 150℃,both denitration efficiency and ammonia escape concentration deviate seriously from the demand value.With the 3 increase of ammonia nitrogen ratio 0.1 mol/mol,flue gas moisture content 5%,inlet NOx concentration 100 mg/m and filtration velocity 0.1 m/min,the variation of denitration efficiency is about 4.1%,-2.6%,2.7%and-1.7%respectively,and the variation of ammonia escape concentration is about 1.9,0.5,2.3 and 0.6μL/L respectively.In the synergistic purification experiments of deacidification and denitration,when the stoichiometric ratio of NaHCO3 to HCl+SO2 was 1.1 mol/mol,the removal efficiency of HCl was basically stable at about 96%,and the removal efficiency of SO2 reached more than 97%and increased slightly with the increase of NH3/NO.When the NH3/NO is above 1 mol/mol,the denitration efficiency can reach more than 70%.For every 0.1 mol/mol increase in NH3/NO,the denitration efficiency increases by about 3.2%,and the ammonia escape concentration increases by about 3.1μL/L.