非热等离子体结合CuO催化剂或Ca(OH)_2吸收剂去除氮氧化物

Removal of NO_x by Nonthermal Plasma Combined with CuO Catalyst or in situ Ca(OH)_2 Absorption

采用非热等离子体结合催化或现场化学吸收的2种方法来去除气流中的NOx.结果表明,非热等离子体结合催化,反应器内的CuO催化剂能有效地促进NO的还原反应;相对于催化还原NO而言,脉冲电晕作用下能有效地降低NO催化还原的反应温度.当催化剂为CuO,脉冲电压为18kV,反应温度为200℃,还原剂为1%CO及NO进口浓度为719 mg/m3条件下,NO的去除率达到了100%.非热等离子体结合现场化学吸收方法,是一种在常温下从气流中净化氮氧化物的有效方法,NO的去除率远远高于反应器内没有吸收剂的情况.可以认为反应器内的Ca(OH)2吸收剂通过与NO的氧化产物NO2或NO3的吸收反应促进了NO的去除.当反应器内有Ca(OH)2吸收剂存在时,在脉冲电压为18kV,O2浓度为2%及NO进口浓度为1 050 mg/m3条件下,NO的去除率达到了100%.

The removals of NO by a wire-in-tube nonthermal plasma reactor combined with catalysis or in situ chemical absorption were investigated. Experimental results show that the plasma reduction of NO was much enhanced by the CuO catalyst in the reactor. On the other hand, for the catalytic reduction of NO, the reaction temperature was effectively decreased by the pulsed corona discharge. A NO reduction of 100% by the plasma reactor combined with CuO catalyst was achieved under the operation condition of inlet NO concentration719 mg/m^3, 1% CO, pulse voltage 18 kV and reaction temperature 473 K. For plasma combined with in situ absorption, it was found that NO removal was much higher than by the reactor without Ca（OH）2 sorbent. It was demonstrated that in situ absorption of NO oxidation products of NO2 and/or NO3 by Ca（OH）2 was responsible for the promotion of NO removal. NO removal of 100% was achieved for 1 050 mg/m^3 NO in a gas mixture of 2% O2 and 98% N2 with a pulse voltage of 18 kV.