NTP技术降低柴油机PM排放及低温再生DPF的研究  

Diesel Particulate Matter Reduction and DPF Regeneration at Low Temperature Based on Non-Thermal Plasma Technology

作　　者：施蕴曦[1] 蔡忆昔[1] 王静[1] 李小华[1] 樊润林 陈祎 SHI Yunxi;CAI Yixi;WANG Jing;LI Xiaohua;FAN Runlin;CHEN Yi(School of Automotive and Traffic Engineering,Jiangsu University,Zhenjiang 212013,China)

机构地区：[1]江苏大学汽车与交通工程学院,镇江212013

出　　处：《内燃机工程》2018年第6期67-78,共12页Chinese Internal Combustion Engine Engineering

基　　金：国家自然科学基金项目(51676089);江苏省高校自然科学研究重大项目(16KJA470002)~~

摘　　要：针对柴油机颗粒捕集器(diesel particulate filter,DPF)传统再生方法的缺陷,根据低温等离子体(non-thermal plasma,NTP)放电理论,探索了NTP低温再生DPF技术。从化学反应动力学角度探讨了基于NTP技术的DPF再生反应机理,并利用现代测试分析技术研究了NTP对颗粒物(particulate matter,PM)质量粒径分布、微观形貌、碳结构及表面官能团演变的作用规律。建立NTP技术再生DPF的试验系统,对已捕集PM的DPF进行再生试验研究。通过监测PM的氧化分解产物CO、CO2的体积分数和DPF的内部温度,结合DPF的背压变化,研究不同再生初始温度下的PM氧化分解特性和DPF再生特性,并考察NTP技术对DPF再生的安全性。研究结果表明,NTP技术可有效分解柴油机排气中的PM,显著降低DPF的再生温度,且无需催化剂。这为DPF再生提供了新的研究途径。In view of the defect of traditional regeneration method for diesel particulate filter(DPF),the DPF regeneration at low temperature using non-thermal plasma(NTP)technology was explored based on the NTP discharge theory.The chemical reaction mechanism of DPF generation with NTP technology was discussed from the point of view of chemical reaction kinetics,and the effect of NTP on the particle size distribution,micro-morphology,carbon structure and surface functional group of particulate matter(PM)were researched with modern testing and analysis technologies.Then an experimental system for DPF regeneration with NTP technology was established,and the regeneration of DPF which had captured PM was experimentally carried out.The oxidation decomposition and regeneration characteristics of DPF at different initial temperatures were studied,and the safety of DPF regeneration with NTP technology was investigated by monitoring the volume fractions of CO and CO2,the internal temperature of DPF,and the change of DPF back pressure.The research results indicate that the NTP technology can effectively decompose PM from diesel engine exhaust gas,and significantly reduce the regeneration temperature of DPF without catalyst.This provides a new research approach for DPF regeneration.

关 键 词：柴油机 颗粒物 低温等离子体 颗粒捕集器 再生 

分 类 号：TK421.5[动力工程及工程热物理—动力机械及工程]