类芬顿试剂液相氧化法脱硝的实验研究

以类芬顿试剂(H2O2/Fe3+/UV)液相氧化法脱硝,探讨了液相催化和类芬顿脱硝反应的机理及其关系.研究了H2O2浓度、H2O2]/Fe3+]、初始pH值、气体流量、紫外光和H2O2投加方式对NO去除率的影响.结果表明,脱硝效率随H2O2浓度增加而升高;H2O2浓度一定时,Fe3+浓度的增加有利于NO的脱除,H2O2]/Fe3+]=6时,脱硝效率最高;当初始pH值3时,pH值升高,脱硝效率下降,初始pH值为3时脱硝效果最好;NO去除率随气体流量的增加而下降;紫外光的照射能提高脱硝效率;分3次等量投加H2O2可以使脱硝效率维持在80%左右.

Experimental research of purification NO-containing gas by aqueous oxidation with Fenton-like agent

The fenton-like agent(H2O2/Fe3+/UV) liquid-phase oxidation method was used to purify the NO-containing gas.The mechanism of aqueous catalytic oxidation and fenton-like reaction in denitrification and their relationship were studied by investigating the influence of different operation parameters such as H2O2 concentration,H2O2]/Fe3+],initial pH value,gas flow,ultraviolet rays(UV) and adding H2O2 on the NO removal efficiency.The results showed that the efficiency was improved with the increase of H2O2 concentration,and the best efficiency could be achieved when H2O2]/Fe3+]=6.Furthermore,when the initial pH value was less than 3,the NO removal efficiency would increase due to the enhancement of pH value,while on the contrary when initial pH>3,and the best efficiency could be reached at the initial pH value at 3.Besides,other processing activities such as employing the UV or decreasing the flue gas mass flow rate could also raise the efficiency.The experiment indicated that the efficiency could be maintained at about 80% if adding H2O2 for three times.