摘要
防爆柴油机是矿井辅助运输车辆使用最为广泛的动力源之一,受防爆改造以及井下恶劣环境的影响,导致其尾气污染问题严重,有悖于绿色矿山发展战略。煤矿井下自2020年12月开始实施非道路国III排放标准,但现阶段矿用防爆柴油机尾气净化多采用机内前处理技术,无法满足非道路国IV及更高标准的排放要求。针对防爆柴油机尾气污染严重及净化技术滞后的问题,设计了一种新型四元组合式尾气后处理系统,并通过仿真和台架试验开展了关键部件结构参数优化及尾气污染物净化性能研究。首先,按照煤矿井下防爆要求,超前面向非道路国IV尾气排放标准,设计了一种由氧化催化剂(DOC)、颗粒捕集器(DPF)、选择性催化还原器(SCR)和防爆温控装置(EPTC)组成的防爆柴油机四元组合式尾气后处理系统;采用STAR-CCM+仿真软件对防爆温控装置结构进行传热分析,结果表明:管壁面温度均小于150℃,可满足煤矿安全规程防爆要求。其次,以某型60 kW防爆柴油机为研究对象,基于GT-Power软件分别搭建了DOC、SCR和DPF后处理部件的仿真模型,并对其关键结构参数及净化性能开展正交试验进行优化,确定了尾气后处理系统关键部件的最优结构参数,得到如下规律:污染物的净化效率随DOC和SCR的载体直径、载体长度和通道密度的增大而提高;载体长度和载体直径对DPF捕集效率与DOC和SCR规律一致,而DPF因其特殊的壁流式载体结构,随着通道密度增加,PM颗粒物的捕集效率可始终维持在96%附近。在此基础上,建立了防爆柴油机和后处理系统的耦合模型,开展了防爆柴油机尾气排放污染物净化效率、动力性与经济性仿真试验。最后,研制了四元组合式尾气后处理系统样机并开展台架试验,将试验数据与仿真数据对比分析,结果表明:尾气后处理系统对CO、NO、HC与颗粒物的净化效率分别大于95%、90%、83%以及95%,
Explosion-proof diesel engine is one of the most widely used power sources for auxiliary transportation vehicles in coal mines at present.It is affected by explosion-proof transformation and harsh underground environment,resulting in serious exhaust pollution,which is contrary to the green mine development strategy.The emission standard of Non-road National Stage III has been implemented in coal mine since December 2020,but at the present stage,the exhaust gas purification of explosion-proof diesel engines for mining uses the internal pretreatment technology,which cannot meet the emission requirements of the Non-road National Stage IV and higher standards.Aiming at the problems of serious exhaust pollution and lagging exhaust purification technology,a four-element combined exhaust aftertreatment system was designed.Through simulation and bench test,the structural parameters optimization of key components and the purification performance of exhaust were studied.First of all,according to the explosion-proof requirements of underground coal mines,a four-element combined exhaust aftertreatment system of explosion-proof diesel engine composed of Diesel Oxidation Catalyst(DOC),Diesel Particulate Filter(DPF),Selective Catalyst Reduction(SCR),and Explosion-proof&Temperature Control device(EPTC)was designed,which exceeds the Non-road National Stage IV standard.The heat transfer analysis of EPTC device structure was carried out through the STAR-CCM+software.The results show that the pipe wall temperature is less than 150℃,which could meet the explosion-proof requirements of coal mine safety regulations.Then,taking a 60 kW explosion-proof diesel engine as the research object,the simulation models of DOC,SCR and DPF aftertreatment components were built based on the GT-Power software.The key structural parameters and purification performance of the aftertreatment system were optimized by orthogonal test,and the optimal structural parameters of the key components were determined,and the following rules were obtained.The puri
作者
张磊
唐彬展
鲍久圣
胡志伟
彭振
胡德平
阴妍
袁晓明
ZHANG Lei;TANG Binzhan;BAO Jiusheng;HU Zhiwei;PENG Zhen;HU Deping;YIN Yan;YUAN Xiaoming(School of Mechatronic Engineering,China University of Mining and Technology,Xuzhou 221116,China;Xiegou Mine,Shanxi XiShan Jinxin Energy Co.,Ltd.,Lüliang033602,China;Xuzhou XCMG Heavy Vehicle Co.,Ltd.,Xuzhou221112,China;CCTEG Taiyuan Research Institute,Taiyuan030006,China)
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2024年第5期2547-2560,共14页
Journal of China Coal Society
基金
徐州市重点研发计划资助项目(KC22419)
江苏省研究生科研与实践创新计划资助项目(KYCX23_2511)
中国矿业大学未来科学家计划资助项目(2023WLKXJ092)。
关键词
防爆柴油机
尾气后处理
“四元”组合式
参数优化
非道路国Ⅳ
explosion-proof diesel engine
exhaust aftertreatment
four elements combined
parameter optimization
Non-road National stage Ⅳ
