配方型吸附剂脱硫脱硝的实验研究

Experimental Study on Desulfurization and Denitrification of V_2O_5-WO_3/TiO_2 Activated Coke-silver Zeolite Formula Adsorbent

通过溶胶-凝胶法制得(V_2O_5-WO_3/TiO_2)SCR催化剂,以质量配比为3 1的活性焦和载银沸石为载体制备负载V_2O_5-WO_3/TiO_2得到活性焦-载银沸石配方型吸附剂,利用X射线光电子能谱仪和X射线多晶衍射仪对SCR催化剂进行表征。在固定床实验系统上进行该配方型吸附剂的脱硫脱硝的实验研究。实验结果表明,SO_2质量浓度为3 428 mg/m3、温度为120℃、O_2体积分数为6%、H_2O体积分数为8%的条件下,脱硫效率达到66.67%;当温度升高时,脱硫效率降低;SO_2质量浓度升高时,SO_2脱除效率呈现先增加后降低的趋势;氧气体积分数对SO_2的脱除有较大影响。NO质量浓度为821 mg/m3、温度为180℃、O_2体积分数为6%、NH_3/NO为1的条件下,NO脱除效率达到53.8%;温度升高,脱硝效率增加;NO的质量浓度对NO脱除效率影响不大;NH_3/NO是影响脱硝的一个重要因素,脱硝效率与其比值呈正相关。

In the experiment,(V2O5-WO3/TiO2)SCR catalyst is made by sol-gel method,mass ratio of activated coke-Z-Ag0is31as carrier to prepare loading V2O5-WO3/TiO2activated coke-silver zeolite formula adsorbent,and X-ray photoelectron spectrometer and X-ray diffraction analysis are used to characterize the synthetic method of the SCR catalyst.The experimental study on desulfurization and denitrification of the adsorbent is carried out in a fixed bed system.The experimental results show,in conditions that the concentration of SO2is3428mg/m3,the temperature is120℃,the volume fraction of O2is6%and the volume fraction of H2O is8%,the removal efficiency can reach66.67%.When the temperature increases,the desulfurization efficiency decreases.With the increase of SO2concentration,SO2removal efficiency increases first and then reduces.Oxygen volume fraction greatly influences SO2removal.In conditions that concentration of NO is821mg/m3,the temperature is180℃,the volume fraction of O2is6%and NH3/NO is1,the removal efficiency of NO can reach53.8%.The temperature increases,the denitrification efficiency increases,the concentration of NO has little effect on the removal efficiency of NO,NH3/NO is one of the important factors affecting denitrification and the denitrification efficiency shows positive correlation with its ratio.