双介质NTP反应器预氧化柴油机NO的试验研究  

Experimental Study on Oxidation of NO from Diesel Engine by Double-Dielectric NTP Reactor

作　　者：王军[1] 何涛[1] 李超[1] 唐炜[1] 王兴华[1] WANG Jun HE Tao LI Chao TANG Wei WANG Xinghua(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》2017年第4期53-56,62,共5页Chinese Internal Combustion Engine Engineering

基　　金：国家自然科学基金项目(51306074);江苏高校优势学科建设工程资助项目(PAPD);江苏大学高级专业人才科研启动基金项目(10JDG051)~~

摘　　要：建立双介质低温等离子体(NTP)反应器预氧化柴油机NO台架试验系统,研究了放电电压峰峰值V_(p-p)、放电频率、排气流量及负荷对NTP预氧化NO性能的影响。试验结果表明:2 100r/min转速、0%负荷工况下,相同放电频率时,NO体积分数随V_(p-p)增大而先减小后增大,NO_2体积分数随V_(p-p)增大而增大,NO_x总量随V_(p-p)增大而先减小后增大;不同放电频率时均存在一个能使NO/NO_2比例为1∶1的V_(p-p)临界值点。排气流量对NTP氧化NO性能影响不大。随着负荷的增大,NTP氧化NO的能力逐渐减弱,其中0%负荷和25%负荷时,NTP能使NO/NO_2比例达到1∶1,协同选择性催化还原(SCR)系统可实现快速SCR反应,提高柴油机低温区间NO_x的转化率。A test system using a reactor of double-dielectric non-thermal plasma（NTP） to pre-oxidize NO from diesel engine was established. The effects of discharge peak to peak voltage （Vp-p）, discharge frequency, exhaust flow and engine load on the performance of NTP＇s pre-oxidizing NO were studied. The results show that, under the working condition of 2 100 r/min engine speed and 0% engine load and with the same discharge frequency, the volume fraction of NO and the total NOx first decrease and then increase as the Vp-p increases ; the volume fraction of NO2 increase with the Vp-p ; among different discharge frequencies, there always exits a critical value of the Vp-p which can make the ratio of NO to NO2 be 1 ： 1. The exhaust flow has insignificant effect on the performance of NTP＇s pre-oxidizing NO. The NTP ability to pre-oxidize NO weakens gradually with the increase of engine load. When the engine load is 0% and 25%, NTP can make the ratio of NO to NO2 reach 1： 1, which helps to speed SCR reaction, thus improving the conversion rate of NOx at low temperature.

关 键 词：柴油机 低温等离子体 氮氧化物 氧化 

分 类 号：TK423[动力工程及工程热物理—动力机械及工程]