来流参数对DOC性能的影响试验
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摘要
基于柴油机台架,通过改变来流温度或者空速,探索来流参数对DOC性能的影响规律.试验结果表明:升高来流温度,压降呈线性增长,且空速越高,增长率越大;发动机正常运行时,DOC温升特性不明显,出口温度变化受到空速和来流温度的影响;排气管喷油时,DOC燃油起燃特性受来流温度的影响,要达到相同DOC出口温度,来流温度越高,THC泄漏量越少; DOC能够显著降低CO和THC的排放,且转化效率都随着来流温度升高而先增加再趋于平缓; DOC将NO氧化为NO_2能力较强,NOx中NO_2的体积分数随着来流温度升高先增加后减小,的最大值在DOC中出现在350℃附近.
Based on the diesel engine bench,the effects of flow parameters on DOC performance were investigated by changing flow temperature or gas hourly space velocity( GHSV). The results show that the pressure drop is linearly increased with the increasing of flow temperature,and the higher the GHSV is,the greater the growth rate is. The characteristic of DOC temperature rise is not obvious in the normal operation of engine,and the outlet temperature change is affected by GHSV and flow temperature. The characteristic of DOC fuel ignition is affected by the flow temperature in exhaust pipe fuel injection,and the higher the temperature is,the less the THC leaks. DOC can significantly reduce the emission of CO and THC,and the conversion efficiency is increased first with latter tending to be gentle with the increasing of flow temperature. The ability of oxidizing NO to NO_2 by DOC is strong,and the ( the volume fraction of NO_2 in NOx) is increased first with latter decreasing with the increasing of flow temperature,and the maximum value of appears in the DOC at around 350 ℃.
Based on the diesel engine bench,the effects of flow parameters on DOC performance were investigated by changing flow temperature or gas hourly space velocity( GHSV). The results show that the pressure drop is linearly increased with the increasing of flow temperature,and the higher the GHSV is,the greater the growth rate is. The characteristic of DOC temperature rise is not obvious in the normal operation of engine,and the outlet temperature change is affected by GHSV and flow temperature. The characteristic of DOC fuel ignition is affected by the flow temperature in exhaust pipe fuel injection,and the higher the temperature is,the less the THC leaks. DOC can significantly reduce the emission of CO and THC,and the conversion efficiency is increased first with latter tending to be gentle with the increasing of flow temperature. The ability of oxidizing NO to NO_2 by DOC is strong,and the ( the volume fraction of NO_2 in NOx) is increased first with latter decreasing with the increasing of flow temperature,and the maximum value of appears in the DOC at around 350 ℃.
引文
[1]YAMAMOTO K,YAMAUCHI K.Numerical simulation of continuously regenerating diesel particulate filter[J].Proceedings of the Combustion Institute,2013,34:3083-3090.
[2]LEE S I,PARK S Y.Numerical analysis of internal flow characteristics of urea injector s for SCR dosing system[J].Fuel,2014,129:51-60.
[3]MIAO Y,CHEN L D,HE Y S,et al.Study of SCR coldstart by energy method[J].Chemical Engineering Journal,2009,155:260-265.
[4]刘鑫,魏胜利,冷先银,等.米勒循环模式的柴油机性能及NOX排放的数值研究[J].广西大学学报(自然科学版),2015,40(2):397-404.LIU X,WEI S L,LENG X Y,et al.Numerical investigation on performance and NOXemission of diesel engine with Miller cycle[J].Journal of Guangxi University(Natural Science Edition),2015,40(2):397-404.(in Chinese)
[5]张纪元.重型柴油机SCR系统应用技术研究[D].济南:山东大学,2013.
[6]帅石金,唐韬,赵彦光,等.柴油车排放法规及后处理技术的现状与展望[J].汽车安全与节能学报,2012,3(3):200-217.SHUAI S J,TANG T,ZHAO Y G,et al.State of the art and outlook of diesel emission regulations and aftertreatment technologies[J].Journal of Automotive Safety and Energy,2012,3(3):200-217.(in Chinese)
[7]OGURA Y,KIBE K,KANEKO S,et al.Development of oxidation catalyst for diesel engine[J].SAE,doi.org/10.4271/940240.
[8]SHINOZAKI R,KISHI Y,TOHNO H.The durability of and evaluation methods for diesel oxidation catalysts[J].SAE,doi.org/10.4271/982802.
[9]KAMIJO M,KAMIKUBO M,AKAMA H,et al.Study of an oxidation catalyst system for diesel emission control utilizing HC adsorption[J].SAE,2001,22:277-280.
[10]WIEBENGA M H,CHANG H K,SCHMIEG S J,et al.Deactivation mechanisms of Pt/Pd-based diesel oxidation catalysts[J].Catalysis Today,2012,184(1):197-204.
[11]王建强,王远,刘双喜,等.柴油车氧化催化技术研究进展[J].科技导报,2012,30(25):68-73.WANG J Q,WANG Y,LIU S X,et al.Progress in diesel oxidation catalysts[J].Science&Technology Review,2012,30(25):68-73.(in Chinese)
[12]孟忠伟,张川,李路,等.DOC对柴油机颗粒物排放影响的试验研究[J].内燃机工程,2015,36(3):68-71.MENG Z W,ZHANG C,LI L,et al.Experimental investigation on the influence of DOC on diesel engine particle emission[J].Chinese Internal Combustion Engine Engineering,2015,36(3):68-71.(in Chinese)
[13]葛蕴珊,赵伟,王军方,等.DOC对柴油机排放特性影响的研究[J].北京理工大学学报,2012,32(5):460-464.GE Y S,ZHAO W,WANG J F,et al.Effects of diesel oxidation catalyst on emission from diesel[J].Transactions of Beijing Institute of Technology,2012,32(5):460-464.(in Chinese)
[14]ANDREW P E,YORK B,AHMADINEJAD M,et al.Modeling of the catalyzed continuously regenerating diesel particulate filter(ccr-dpf)system:model development and passive regeneration studies[J].SAE,doi.org/10.4271/2007-01-0043.
[15]田茂军,朱红国,黄德军,等.前置DOC对SCR系统柴油机NOX排放的影响[J].车用发动机,2015(4):80-84.TIAN M J,ZHU H G,HUANG D J,et al.Effect of preDOC on NOXemission for SCR diesel engine[J].Vehicle Engine,2015(4):80-84.(in Chinese)
[16]PATTERSON M J,ANGOVE D E,CANT N W.The effect of carbon monoxide on the oxidation of four C6to C8hydrocarbons over platinum,palladium and rhodium[J].Applied Catalysis B:Environmental,2000,26(1):47-57.
[17]楼狄明,刘影,谭丕强,等.DOC/DOC+CDPF对重型柴油车气态物排放的影响[J].汽车技术,2016(10):22-26.LOU D M,LIU Y,TAN P Q,et al.The influences of DOC and DOC+CDPF on gaseous emissions of heavyduty diesel vehicle[J].Automobile Technology,2016(10):22-26.(in Chinese)
[18]冯谦,楼狄明,计维斌,等.DOC/DOC+CDPF对重型柴油机气态物排放特性的影响研究[J].内燃机工程,2014,35(4):1-6.FENG Q,LOU D M,JI W B,et al.Effects of DOC and DOC+CDPF on gaseous emissions from a heavy-duty diesel engine[J].Chinese Internal Combustion Engine Engineering,2014,35(4):1-6.(in Chinese)
[2]LEE S I,PARK S Y.Numerical analysis of internal flow characteristics of urea injector s for SCR dosing system[J].Fuel,2014,129:51-60.
[3]MIAO Y,CHEN L D,HE Y S,et al.Study of SCR coldstart by energy method[J].Chemical Engineering Journal,2009,155:260-265.
[4]刘鑫,魏胜利,冷先银,等.米勒循环模式的柴油机性能及NOX排放的数值研究[J].广西大学学报(自然科学版),2015,40(2):397-404.LIU X,WEI S L,LENG X Y,et al.Numerical investigation on performance and NOXemission of diesel engine with Miller cycle[J].Journal of Guangxi University(Natural Science Edition),2015,40(2):397-404.(in Chinese)
[5]张纪元.重型柴油机SCR系统应用技术研究[D].济南:山东大学,2013.
[6]帅石金,唐韬,赵彦光,等.柴油车排放法规及后处理技术的现状与展望[J].汽车安全与节能学报,2012,3(3):200-217.SHUAI S J,TANG T,ZHAO Y G,et al.State of the art and outlook of diesel emission regulations and aftertreatment technologies[J].Journal of Automotive Safety and Energy,2012,3(3):200-217.(in Chinese)
[7]OGURA Y,KIBE K,KANEKO S,et al.Development of oxidation catalyst for diesel engine[J].SAE,doi.org/10.4271/940240.
[8]SHINOZAKI R,KISHI Y,TOHNO H.The durability of and evaluation methods for diesel oxidation catalysts[J].SAE,doi.org/10.4271/982802.
[9]KAMIJO M,KAMIKUBO M,AKAMA H,et al.Study of an oxidation catalyst system for diesel emission control utilizing HC adsorption[J].SAE,2001,22:277-280.
[10]WIEBENGA M H,CHANG H K,SCHMIEG S J,et al.Deactivation mechanisms of Pt/Pd-based diesel oxidation catalysts[J].Catalysis Today,2012,184(1):197-204.
[11]王建强,王远,刘双喜,等.柴油车氧化催化技术研究进展[J].科技导报,2012,30(25):68-73.WANG J Q,WANG Y,LIU S X,et al.Progress in diesel oxidation catalysts[J].Science&Technology Review,2012,30(25):68-73.(in Chinese)
[12]孟忠伟,张川,李路,等.DOC对柴油机颗粒物排放影响的试验研究[J].内燃机工程,2015,36(3):68-71.MENG Z W,ZHANG C,LI L,et al.Experimental investigation on the influence of DOC on diesel engine particle emission[J].Chinese Internal Combustion Engine Engineering,2015,36(3):68-71.(in Chinese)
[13]葛蕴珊,赵伟,王军方,等.DOC对柴油机排放特性影响的研究[J].北京理工大学学报,2012,32(5):460-464.GE Y S,ZHAO W,WANG J F,et al.Effects of diesel oxidation catalyst on emission from diesel[J].Transactions of Beijing Institute of Technology,2012,32(5):460-464.(in Chinese)
[14]ANDREW P E,YORK B,AHMADINEJAD M,et al.Modeling of the catalyzed continuously regenerating diesel particulate filter(ccr-dpf)system:model development and passive regeneration studies[J].SAE,doi.org/10.4271/2007-01-0043.
[15]田茂军,朱红国,黄德军,等.前置DOC对SCR系统柴油机NOX排放的影响[J].车用发动机,2015(4):80-84.TIAN M J,ZHU H G,HUANG D J,et al.Effect of preDOC on NOXemission for SCR diesel engine[J].Vehicle Engine,2015(4):80-84.(in Chinese)
[16]PATTERSON M J,ANGOVE D E,CANT N W.The effect of carbon monoxide on the oxidation of four C6to C8hydrocarbons over platinum,palladium and rhodium[J].Applied Catalysis B:Environmental,2000,26(1):47-57.
[17]楼狄明,刘影,谭丕强,等.DOC/DOC+CDPF对重型柴油车气态物排放的影响[J].汽车技术,2016(10):22-26.LOU D M,LIU Y,TAN P Q,et al.The influences of DOC and DOC+CDPF on gaseous emissions of heavyduty diesel vehicle[J].Automobile Technology,2016(10):22-26.(in Chinese)
[18]冯谦,楼狄明,计维斌,等.DOC/DOC+CDPF对重型柴油机气态物排放特性的影响研究[J].内燃机工程,2014,35(4):1-6.FENG Q,LOU D M,JI W B,et al.Effects of DOC and DOC+CDPF on gaseous emissions from a heavy-duty diesel engine[J].Chinese Internal Combustion Engine Engineering,2014,35(4):1-6.(in Chinese)