【摘要】 为了控制柴油机尾气污染物排放,研制低温等离子体协同木纤维净化碳烟颗粒物（PM）和NO_x的尾气净化器,利用高压脉冲电晕放电产生低温等离子体,木纤维滤芯一方面作为纳米级CeO₂催化剂的载体,另一方面可以有效捕集PM。设计尾气净化器性能测试试验台,对净化器净化PM和NO_x的性能进行试验研究。以一定比例浓度的N₂、NO和O₂混合组成柴油机的模拟尾气,将PM提前加载于木纤维滤芯上,气体温度控制在100℃²30℃范围内。试验结果表明:木纤维可为催化剂提供良好的催化环境,催化剂对净化器净化PM和NO_x起到了催化促进作用;木纤维滤芯PM负载量的增加可提高净化器对NO_x的净化效率;净化器输入电压升高可增加其对PM和NO_x的净化效率。更多还原

【Abstract】 To reduce the emissions of pollutants from diesel exhaust,the plasma wood fiber purifier was developed by combining plasma with wood-fiber-purified soot particulate matter（ PM） and nitric oxide（ NO_x）. Nonthermal plasma was produced by high-voltage pulse corona discharge. On one hand,the wood fiber core was used as the nanoscale cerium oxide（ CeO₂） catalyst carrier. On the other hand,the wood fiber captured PM effectively. A test bench was designed to measure the factors that influence the performance of PM and NO_x. The simulated exhaust gas was composed of a certain proportion of N₂,NO,and O₂. PM was loaded on the wood fiber filter in advance.Furthermore,the gas temperature was controlled in the range of 100 ℃ to 230 ℃. The results of experimental study indicate that the wood fiber can provide a qualified catalytic environment for nanoscale CeO₂ and the purification efficiency of the purifier for NO_x and PM can be enhanced by catalyst; the PM mass loaded on the filter core influences the purification efficiency for NO_x and the purification efficiency increases with the increase in PM mass; and the input voltage of the purifier improves its purification efficiency for NO_x and PM.更多还原