柴油甲醇组合燃烧对机车柴油机排放性能的影响  

The Impacts of Diesel/Methanol Compound Combustion on theEmissions of Locomotive Diesel Engines

作　　者：刘明宽 姚安仁[1] 吴亦宁 薛良军 陈超[1] 胡江涛[1] 姚春德[1] Liu Mingkuan;Yao Anren;Wu Yining;Xue Liangjun;Chen Chao;Hu Jiangtao;Yao Chunde(State Key Laboratory of Engines,Tianjin University,Tianjin 300072;CRRC Qishuyan Co.,Ltd.,Jiangsu Changzhou 213011)

机构地区：[1]天津大学,内燃机燃烧学国家重点实验室,天津300072 [2]中车戚墅堰机车有限公司,江苏常州213011

出　　处：《柴油机》2020年第5期1-6,共6页Diesel Engine

基　　金：国家自然科学基金资助项目(51676134)。

摘　　要：对一台应用于机车的中速大型柴油机,按照柴油/甲醇组合燃烧(DMCC)的要求,进行了相应的改造,以探究DMCC燃烧模式对其排放性能的影响。结果表明:在800 r/min@9600 N·m工况下,掺烧甲醇后,NOx比排放大幅降低,但过分提高甲醇替代率,则NOx比排放会有所升高;CO2比排放、燃料费用随甲醇替代率的升高而降低;当量油耗则先随甲醇的替代率提高而升高,随后降低;HC比排放随甲醇替代率提高有所升高。相比于原机,在800 r/min、9600 N·m、-4°ATDC、35.9%替代率工况,NO x比排放仅为3.15 g/(kW·h),最大降幅达到56.5%;DMCC模式,640 r/min@6850 N·m工况下,随着供油提前角的推迟,NO x、HC比排放降低,排气温度逐渐升高;中等替代率下最低油耗对应的供油提前角推迟,高替代率下供油提前角提前。The modification of a large medium-speed locomotive diesel engine was carried out according to the requirements of implementing diesel/methanol compound combustion(DMCC),and the impacts of DMCC combustion mode on the emissions were explored.The experimental results showed that at working condition of 800 r/min@9600 N·m,the NOx emission was greatly reduced after injecting methanol,but the NOx emission would increase once the methanol-substitution rate was beyond the limitation.And under the same working condition,with the increasing of methanol-substitution rate,both the CO2 emi-ssions and the fuel cost decreased,and the BSFC increased first and a then decreased,the HC emi-ssions increased.Under the working condition of 800 r/min,9600 N·m,-4°CA ATDC,35.9%subs-titution rate,the NO x emissions,which was only 3.15 g/(kWh),had a maximum reduction of 56.5%compared to the original engine.Under the working condition of 640 r/min@6850 N·m of DMCC mode,with the delay of the fuel supply advance angle,both NO x emissions and HC emissions decreased,exhaust gas temperature increased.The fuel supply advance angle corresponding to the minimum BSFC was delayed under medium substitution rate and advanced under high substitution rate.

关 键 词：柴油/甲醇 燃烧 机车柴油机 排放性能 

分 类 号：TK421+.5[动力工程及工程热物理—动力机械及工程]