摘要
选取了满足目前国六排放标准的重型柴油机和天然气发动机,在发动机台架上运行冷热态世界统一瞬态循环(world harmonized transient cycle,WHTC),同时测量直径10 nm以上颗粒物数量(particle numbers with diameter above 10 nm,PN10)和直径23 nm以上颗粒物数量(particle numbers with diameter above 23 nm,PN23)。结果表明:该柴油机的PN10比排放比PN23高35.3%~105.4%;而天然气发动机PN10比排放较PN23高84.8%~1400.0%,PN10和PN23的瞬态排放变化规律基本一致。天然气发动机冷起动时排气温度较低,且混合气加浓导致PN排放非常严重。尤其是对于高热值天然气,冷态WHTC下10 nm~23 nm的PN排放占总PN排放的93.3%,天然气发动机细颗粒物数量排放亟待进行管控。
A heavy-duty diesel engine and a heavy-duty natural gas engine that meet the current ChinaⅥemission standard were selected to run hot and cold world harmonized transient cycle(WHTC)on the engine test bench.Fine particle numbers with diameters above 10 nm(PN10)and fine particle numbers with diameters above 23 nm(PN23)were measured at the same time.The results show that the specific emission of PN10 of this diesel engine were 35.3%~105.4%higher than that of PN23.The PN10 specific emissions of the natural gas engine were 84.8%~1400.0%higher than that of the PN23.The changes of transient emissions of PN10 and PN23 were basically the same.PN emissions of natural gas engine were extremely serious at cold run due to the low exhaust temperature and mixture rich strategy.Especially for natural gas with high calorific value,the PN emission with particle diameter within 10 nm~23 nm accounted for as high as 93.3%in the total PN emission.It is urgent to strengthen the control of fine particle number emissions for natural gas engines.
作者
汪晓伟
凌健
景晓军
张琳
高涛
李刚
WANG Xiaowei;LIN Jian;JING Xiaojun;ZHANG Lin;GAO Tao;LI Gang(CATARC Automotive Test Center(Tianjin)Co.,Ltd.,Tianjin 300300,China;Chinese Research Academy of Environmental Sciences,Beijing 100012,China)
出处
《内燃机工程》
CAS
CSCD
北大核心
2022年第6期78-83,90,共7页
Chinese Internal Combustion Engine Engineering
基金
国家重点研发计划项目(2019YFC0214800,2022YFC3703600)。
关键词
柴油机
天然气发动机
细颗粒物
颗粒物数量
排放
diesel engine
natural gas engine
fine particle
particle number
emission
