柴油机催化型颗粒捕集器喷油助燃再生特征  

Bench test of regeneration characteristics of catalyzed diesel particulate filter based on fuel injection combustion system

作　　者：张韦 陈朝辉 孔孟茜 赵罗峰 包广元 Zhang Wei;Chen Zhaohui;Kong Mengxi;Zhao Luofeng;Bao Guangyuan(Faculty of Transportation Engineering, Kunming University of Science and Technology, Yunnan keyLaboratory of Internal Combustion Engine, Kunming 650500,China)

机构地区：[1]昆明理工大学交通工程学院云南省内燃机重点实验室,昆明650500

出　　处：《农业工程学报》2019年第8期92-99,共8页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金资助项目(51666007;51665023)

摘　　要：针对在用车辆的排放升级改造,以及满足非道路移动源四阶段排放标准限制要求,该文基于自主开发的喷油助燃主动再生系统,开展了加装DPF(diesel particulate filter)和不同CDPF(catalyzed diesel particulate filter)后处理器的发动机外特性试验和喷油助燃主动再生燃烧试验。结果表明:催化剂负载量为530g/m^3的CDPF,对外特性下发动机的动力性和经济性影响较小,并为碳烟再生提供了充足的NO_2组分,因而其最大排气压差比DPF低8.8kPa。630℃时无二次供气的CDPF其再生效率高达96.4%,载体最高温度比DPF低31℃;采用二次供气速率1.25L/s、时长180s,继续供气速率0.625 L/s、时长420 s的再生方案,600℃时CDPF的再生效率为83.2%,载体最高温度比无二次供气时降低了64℃;进行停机再生与怠速再生时,催化剂负载量为530 g/m^3的CDPF具有更好的再生特性,其停机再生效率为76.4%,怠速再生效率达到88.5%。本研究对开发安全、高效的主动再生系统具有借鉴意义,并可为催化条件下的主动再生策略研究提供数据支撑。In order to provide technical references for upgrading emissions of existing vehicles, to meet the four-stage emission limitation requirements of non-road mobile machineries, based on the self-developed fuel injection combustion active regeneration system, the external characteristic tests of diesel engine with diesel particulate filter(DPF) and the active regeneration combustion tests were carried out in this paper. The results showed that the catalyzed diesel particulate filter(CDPF) with 530 g/m^3 catalysts loading, name as CDPF1, has little effect on the power and economy performances of the engine under external characteristic conditions. At 3 000 r/min, the volume fraction of NO2 is 81×10^-6 at front end of CDPF1,while it is increased by 33×10^-6 at rear end of that. This indicates that with the action of Pt and Pd bimetallic catalysts, the binding rate of NO to exhaust O2 is higher than the rate of active oxygen dissociated from NO2 binding to the soot active sites.Adequate NO2 content promotes regeneration efficient of soot in the CDPF, therefore the maximum exhaust pressure difference of CDPF1 was 8.8 kPa which lower than that of DPF. On the basis of external characteristic tests, the active regeneration tests of fuel injection combustion was further carried out. The first part of the regeneration tests were carried on the combustion test bench, the combustion temperatures were controlled by dosing control unit(DCU) to be 550, 600 and630 ℃, respectively. In order to prevent the peak temperature and thermal stress in the carrier from being too high during regeneration, secondary gas supply was carried out after fuel injection. Based on the principle that the amount of the secondary gas supply matches with displacement of the test engine, 4 different secondary gas supply schemes were adopted. The experimental results showed that when the regeneration temperature was 630 ℃, the regeneration efficiency of CDPF1 reached 96.4% in the absence of secondary gas supply, however, the regeneration efficiency o

关 键 词：柴油机 燃烧 催化剂 再生 DPF CDPF 喷油助燃 台架试验 

分 类 号：TK411.5[动力工程及工程热物理—动力机械及工程]