脉冲放电等离子体治理甲苯废气放大试验研究

应用脉冲放电等离子体技术,在线板式反应器内对低浓度甲苯废气的治理进行放大试验.采用闸流管开关脉冲电源,其最大输出功率1kW,最大脉冲电压峰值100kV. 试验规模4～16m³·h^-1. 试验考察了峰值电压、重复频率、进口浓度和处理气量对甲苯去除率的影响.结果表明:峰值电场强度在9～12kV·cm^-1范围内增加,甲苯去除率相应明显提高;当处理气量为4 m³·h^-1、脉冲电压峰值69kV、进口浓度1 180mg·m^-3、重复频率300pps时, 甲苯的去除率可达88%;反应器的能量利用率在16g·(kW·h)^-1左右;甲苯的降解产物主要是CO₂和H₂O,还有少量CO. 结合甲苯去除率与能量密度、甲苯进口浓度的关系,建立反应器动力学模型,获得甲苯的反应速率常数为0.00356 L·J^-1. 为进一步优化放大反应器设计及与电源匹配提供了基础数据.

Scale-up Study on Pulse Corona Discharge for the Removal of Toluene

The scale-up experiments of the decomposition of toluene by pulse corona discharge in wire-plate reactor were investigated. The maximum output power of pulse voltage source was 1 kW, and the maximal peak voltage was 100 kV. The experiments were conducted with a gas-flow rate of 4-16 m3 x h(-1). Different parameters which influenced on removal efficiency were investigated, such as peak voltage, pulse frequency, inlet concentration of toluene, gas-flow rate. The results showed that the removal efficiency was improved obviously when the peak field intensity was changed in the range of 9-12 kV x cm(-1); the removal efficiency 88% was obtained when gas-flow rate, peak voltage, inlet concentration of toluene, pulse frequency were 4 m3 x h(-1), 69 kV, 1180 mg x m(-3), 300 pps respectively. The energy yield of toluene was about 16 g x (kW x h)(-1); the main products of decomposition were CO2 and H2O, few of CO. Combining the removal efficiency of toluene with energy density and inlet concentration of toluene, a reaction kinetic mathematic model was developed. By this model, the decomposition rate constant of toluene was 0.00356 L x J(-1). According to the results, the optimization design for the reactor and the matching of pulse voltage source were reckoned.