气体氛围对低温等离子体协同控制汞和二噁英的影响

Influence of Gas Atmosphere on Synergistic Control of Mercury and Dioxin by Non-thermal Plasma

为了控制垃圾焚烧烟气中排放的汞和二噁英类物质,利用窄脉冲电源放电,通过自行设计的实验装置系统,以1,2,4–三氯苯作为二噁英类似物(TCB),考察了气体氛围对低温等离子体协同控制汞和二噁英的影响。实验结果表明:NO、SO2、HCl 3种酸性气体对消除降解TCB存在竞争作用,SO2和HCl对TCB消除竞争影响更加显著;比较无/全NO、SO2、HCl 3种酸性气体综合氛围,Hg0氧化率受气体氛围影响变化明显,各气体组分对Hg0氧化作用复杂,NO对降解效果的影响比较关键;在"酸性气体+Hg0+TCB"的烟气氛围中,Hg0氧化和TCB降解消除相互影响效果不同,各种烟气成分对结果贡献复杂,系统协同控制效果还能够继续提升;根据生成产物反推,·OH在TCB降解消除两大步历程中作用关键。该研究将为焚烧行业烟气协同控制新技术提供数据支持。

By utilizing a narrow pulse power discharge,synergistic control of mercury and dioxins was studied by using 1,2,4-trichlorobenzene(TCB)as a dioxin analogue through a self-designed experimental system in order to control the emission of mercury and dioxin substances in waste incineration flue gas.The competitive effects of NO,SO2 and HCl on the TCB removal by non-thermal plasma were discussed.In the three sour gas atmospheres,the oxidation of Hg0 decreased by about 10%,the oxidation of Hg0 by each gas component was complex,and the effect of NO on the degradation was relatively crucial.In the flue gas atmosphere of‘acid gas+Hg0+TCB’,the interaction between Hg0 oxidation and TCB degradation was different.The contribution of various flue gas components to the results was complicated,but the overall experimental results show that the synergistic control effect of the system can continue to improve.According to the reversion of generated products,·OH plays an important role in the synergistic control of the degradation of Hg0 and TCB.This work should provide basic research data for flue gas synergetic control in incineration industry.