低温等离子木质钙钛矿柴油机尾气净化器设计与试验  

Non-thermal plasma-woody perovskite purifier for diesel engine exhaust

作　　者：王迎辉[1,2] 郭秀荣 张昊男[1] 杜丹丰 亓占丰[3] WANG Yinghui;GUO Xiurong;ZHANG Haonan;DU Danfeng;Qi Zhanfeng(College of Mechanical and Electrical Engineering,Northeast Forestry University,Harbin 150040,China;Faculty of Electrical Engineering,Suihua University,Suihua 152061,China;School of Mechanical Engineering,Dalian University,Dalian 116622,China)

机构地区：[1]东北林业大学机电工程学院,哈尔滨150040 [2]绥化学院电气工程学院,绥化152061 [3]大连大学机械工程学院,大连116622

出　　处：《农业工程学报》2024年第16期52-63,共12页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金项目(52271128);黑龙江省自然科学基金项目(LH2022E118)联合资助。

摘　　要：为有效提高低温等离子体(non-thermal plasma,NTP)协同木质钙钛矿型催化剂净化柴油机尾气的效能,首先,设计了以刚玉管和木质钙钛矿型催化剂为介质的介质阻挡放电反应器(dielectric barrier discharge,DBD),建立了DBD反应器的二维仿真模型,采用COMSOL软件等离子体模块计算DBD反应器不同参数条件下活性物种的数密度,通过分析得出较优的反应器内部参数;其次,设计了低温等离子木质钙钛矿柴油机尾气净化器总体结构,建立了基于压力损失的数值模型,分析不同DBD布置形式对排气背压的影响;最后,搭建发动机台架以对该净化器的净化性能进行试验验证。研究结果表明:当净化器输入电压为15 kV,填充率为30%,DBD并联个数为20,反应器长度为0.16 m时,尾气净化器的排气背压满足国标要求,可实现碳烟颗粒物(particulate matter,PM)、NO_x、CO和HC的同时净化。当发动机转速为2 600 r/min、发动机负荷为50%时,净化器对PM、NO_x、CO和HC的净化效率分别为92%、64%、72%和61%。该研究结果可为NTP协同催化在净化汽车尾气净化领域的应用提供理论参考。Woody perovskite-type catalysts are the sorts of porous catalysts with biomass morphology,in order to achieve the simultaneous purification of PM,NOx,CO,and HC.Among them,the ratio of adsorbed oxygen(Oads)/lattice oxygen(Olatt)of perovskite-type catalysts can be improved to avoid the collapse and aggregation of perovskite-type catalysts.The reason was attributed to the presence of a large number of high-energy electrons,active particles,and active heavy particles in non-thermal plasma(NTP).In addition,the NTP can outstandingly improve the specific surface area and porosity of catalysts.The NTP can enhance the four-way purification performance of PM,NOx,CO,and HC emitted by automobile exhausts over woody perovskite-type catalysts.Dielectric barrier discharge(DBD)can generate the NTP under atmospheric pressure conditions,indicating the broad application prospects in environmental protection and material processing.This study aims to enhance the performance of NTP synergistic woody perovskite-type catalysts,in order to purify the diesel engine exhaust.Firstly,a DBD reactor was designed,of which the corundum tubes and woody perovskite-type catalysts were used as the discharge medium.A two-dimensional simulation model was established for the DBD reactor.The plasma module of COMSOL software was employed to calculate the number density of active species under different parameter conditions of the reactor.After that,the optimal internal parameters of the reactor were obtained.Secondly,the overall mechanical structure of the non-thermal plasma-woody perovskite purifier was designed for the diesel engine exhaust.A numerical model was established to analyze the impact of different DBD arrangements on exhaust back pressure using pressure loss.Lastly,a test bench of the diesel engine was set to verify the purification performance of the purifier.According to the relevant regulations of automotive testing,the D2(5 loads operating at rated speed)test cycle was selected from the ISO 8187 international standard,in order to test a

关 键 词：NTP 木质钙钛矿 DBD 参数 尾气净化器 数值模型 试验 

分 类 号：TK422[动力工程及工程热物理—动力机械及工程]