CAJ | 학술논문

[目的]研究强电离放电降解甲醛的效果.[方法]采用强电离放电的方法产生羟基自由基(OH·),进行不外加吸收剂和催化剂的甲醛脱除试验,分别研究甲醛气体初始浓度、气体流量、停留时间、外加电压等因素对甲醛降解效率η的影响.[结果]随着HCHO初始浓度的增加,HCHO分子与活性粒子碰撞、反应的机率减小,当HCHO初始浓度大于500 mg/m~3,甲醛净化效率η下降幅度增大.降解过程中随着停留时间的增加,去除效率η增大,0.6 s以后η增加不明显,停留时间以0.4～0.5 s为宜.降解过程中,气体流量Q对甲醛的净化效率η也有较大的影响,随着Q的增加,η下降明显.等离子体反应器外加电压U的变化对降解效率有显著影响,可在等离子体反应器能承受的电压3.6 kV内,通过大幅度提高外加电压能够提高降解效率η.降解过程中,没有任何有机气体产生,甲醛的降解效率可达85%以上.[结论]强电离放电降解甲醛可有效去除HCHO,且反应过程不需外加吸收剂和催化剂,无二次污染,生成产物是CO_2和H_2O.
[목적]연구강전리방전강해갑철적효과.[방법]채용강전리방전적방법산생간기자유기(OH·),진행불외가흡수제화최화제적갑철탈제시험,분별연구갑철기체초시농도、기체류량、정류시간、외가전압등인소대갑철강해효솔η적영향.[결과]수착HCHO초시농도적증가,HCHO분자여활성입자팽당、반응적궤솔감소,당HCHO초시농도대우500 mg/m~3,갑철정화효솔η하강폭도증대.강해과정중수착정류시간적증가,거제효솔η증대,0.6 s이후η증가불명현,정류시간이0.4～0.5 s위의.강해과정중,기체류량Q대갑철적정화효솔η야유교대적영향,수착Q적증가,η하강명현.등리자체반응기외가전압U적변화대강해효솔유현저영향,가재등리자체반응기능승수적전압3.6 kV내,통과대폭도제고외가전압능구제고강해효솔η.강해과정중,몰유임하유궤기체산생,갑철적강해효솔가체85%이상.[결론]강전리방전강해갑철가유효거제HCHO,차반응과정불수외가흡수제화최화제,무이차오염,생성산물시CO_2화H_2O.
[Objective]The research aimed to study the effects of formaldehyde degradation using strong ionization discharge.[Method]A majority of gas concentration using strong ionization discharge method to carry out formaldehyde removal experiment without catalyst and absorbent.And some factors such as initial concentration,gas flow ,residence time,applied voltage which affected the formaldehyde removal efficiency were studied.[Result]The results showed that as the initial concentration of formaldehyde increased,the probabilities of collision and reaction between formaldehyde and active molecules decreased.When it was higher than 500 mg/m~3,the decrease range of formaldehyde removal efficiency(η) increased.During the process of formaldehyde degradation,as the residence time increased,η increased.After 0.6 s,the increase of η became unconspicuous,and the suitable residence time was 0.4-0.5 s.At the same time gas flow(Q) had great impacts onη,Q increased,η decreased significantly. Applied voltage(U) of plasma reactor had obvious impacts on η,when U increased obviously during 3.6 kV,η could be raised. During the process of formaldehyde degradation,there was no other organic gas generated,andηcould reached higher than 85%.[Conclusion]Under the condition of normal temperature,non-catalyst and non-absorbent,formaldehyde was directly oxidized into CO_2 and H_2O in plasma reactor.It had realized resource utilization without second pollution.