介质阻挡放电低温等离子体对柴油机排放物的影响

Effect of Dielectric Barrier Discharge on the Exhaust Emissions from Diesel Engine

以介质阻挡放电(DBD)理论对低温等离子体净化试验装置进行了探讨分析,设计出介质阻挡放电低温等离子体试验装置.利用自制的介质阻挡放电试验装置,采用交流高压、高频电源产生等离子体,对柴油机排放物进行后处理净化试验.结果表明,使用介质阻挡放电低温等离子体可有效脱除柴油机颗粒物(PM),脱除效率可达7900,总碳氢化合物(THC)脱除效率将近2000,同时氮氧化合物(NOx)也有所降低.扫描电子显微镜(SEM)观测结果显示,多数颗粒物的粒径都有所减小.

The non-thermal plasma (NTP) after-treatment experimental equipment was analyzed and designed based on the dielectric barrier discharge (DBD) theory. By using the NTP after-treatment experimental equipment and the alternating current power with high voltage and high frequency, the after-treatment experiments of exhaust emissions from a diesel engine were carried out. The experimental results show that the NTP exhaust after-treatment technique is effective on the removal of particulate matters and the removal efficiency of particulate matter can reach 79%; meanwhile the THC removal efficiency is up to 20%. NOx is also reduced to some extent. Furthermore, by scanning electron microscope (SEM), it is revealed that the sizes of most particulate matters diminish after NTP treatment.