低温等离子体-臭氧催化氧化降解硫化氢气体的耦合效果与调控方法研究

利用低温等离子体在降解污染过程中产生的副产物臭氧,开展了低温等离子体-臭氧催化氧化耦合工艺同时去除硫化氢和臭氧研究,考察了催化剂粒径、空床停留时间、催化反应温度、等离子体输入功率等工艺参数对硫化氢降解和副产物臭氧浓度的影响。研究发现:臭氧需求因子(Df)与催化床层出口的硫化氢与臭氧浓度之间有一定的对应关系,ln(Df)介于3~4时,尾气中硫化氢和臭氧的浓度可分别维持在5.0×10-6,3×10-6m3/m3以下;等离子体能量密度SIE/Cin与ln(Df)值成明显的正相关:ln(Df)=30.924SIE/Cin-3.5622。对于进气浓度(Cin)和气体流速(Q)皆已知的硫化氢废气,通过调控输入功率(P)来调控SIE使ln(Df)值在3~4,可使耦合工艺具有最佳的去除效果,实现硫化氢和臭氧最佳去除。

DEGRADATION OF HYDROGEN SULFIDE USING NON-THERMAL PLASMA AND OZONE CATALYTIC OXIDATION

The paper researched the simultaneous removal of hydrogen sulfide and ozone using the coupling process of nonthermal plasma and ozone catalytic oxidation.The effect of catalyst particle size,empty bed residence time,catalytic temperature and NTP input power were also studied.Ozone demand factor (Df) had some relation with the outlet concentration of hydrogen sulfide and ozone.When Df was at 3 ～ 4,the outlet concentration of hydrogen sulfide and ozone was under 5.0 × 10-6,3 × 10-6 m3/m3, respectively.Besides,SIE/Cin had a positive correlation with ln(Df):ln(Df) =30.924SIE/Cin-3.5622.For the hydrogen sulfide waste gas,whose inlet concentration (Gin) and flow rate (Q) were known,if ln(Df) was at 3 ～ 4 by controlling the input power (P),the hydrogen sulfide and by-product ozone could be removed simultaneously.