能量密度对低温等离子体辅助催化转化柴油机颗粒物和NO_x的影响  

Effect of energy density on removal of particulate matter and NOx emissions from diesel engine

作　　者：张琳[1] 蔡忆昔[1] 王攀[1] 闫亚洲[1] 郑荣耀[1] 

机构地区：[1]江苏大学汽车与交通工程学院,镇江212013

出　　处：《农业工程学报》2011年第11期116-119,共4页Transactions of the Chinese Society of Agricultural Engineering

基　　金：江苏省自然科学基金资助项目(BK2010330);江苏省高校自然科学研究项目(10KJB470001)

摘　　要：为了研究低温等离子体辅助催化后处理技术对柴油机有害排放物的作用效果,基于介质阻挡放电理论设计了低温等离子体(NTP)发生器,研究了NTP发生器工作电压随能量密度的变化关系。以涂覆γ-Al2O3的蜂窝状陶瓷为载体,采用柠檬酸凝胶法制备了LaMnO3催化剂,建立了NTP辅助LaMnO3催化试验系统。在台架试验基础上,研究了能量密度变化对NTP辅助LaMnO3催化技术转化(颗粒物)PM和NOx的影响规律。试验结果表明:在相同频率作用下,NTP发生器的能量密度随着工作电压的升高而增加;与原机相比,NTP辅助LaMnO3催化技术作用后NO浓度显著降低,NO2浓度显著增加,NOx浓度降低;随着能量密度的增加,碳烟转化效果越明显,碳烟的不透光烟度最高降低约83%。结果表明NTP辅助LaMnO3催化技术可有效转化PM和NOx,在柴油机排气后处理领域有着广泛的研究前景。On the basis of the dielectric barrier discharge theory,a non-thermal plasma reactor was designed and the relationship between the energy density and working voltage was investigated.LaMnO3 catalyst was loaded on the ceramic honeycomb schedules by the means of citrate-gel method.The non-thermal plasma assisted LaMnO3 catalyst system was established.The bench test was carried out to investigate the reduction of particulate matter and NOx emissions from diesel engine with NPAC technology.Results showed that the energy density of NTP generator increases with working voltage under different frequencies.The concentration of NO was significantly reduced,the concentration of NO2 was increased obviously and the concentration of NOx decreased after NPAC technology.With the increase of energy density,soot smoke opacity was decreased and the maximum reduction was to 83%.The results show that particulate matter and NOx emissions can be effectively transformed by NPAC technology,NPAC technology has a broad prospect in the field of exhaust after treatment.

关 键 词：柴油机 排放控制 催化 介质阻挡放电 低温等离子体 台架试验 

分 类 号：TK421.5[动力工程及工程热物理—动力机械及工程]