进气成分和压力组合优化船用二冲程柴油机排放  

Emissions optimization of two-stroke marine diesel engine based on composition and pressure of intake

作　　者：谭亲明 胡以怀[1] 谭志文 TAN Qinming;HU Yihuai;TAN Zhiwen(Marine Engineering Department,Shanghai Maritime University,Shanghai 201306,China;Jiangnan Institute of Technology,Shanghai 201913,China)

机构地区：[1]上海海事大学商船学院,上海201306 [2]江南造船(集团)有限责任公司研究院,上海201913

出　　处：《武汉大学学报（工学版）》2018年第7期634-639,共6页Engineering Journal of Wuhan University

基　　金：上海海事大学博士研究生创新基金(编号:2015ycx080)

摘　　要：以B＆W 6S35ME-B9型船用二冲程柴油机为研究对象,在GT-Power中搭建一维仿真计算模型,研究扫气压力和进气成分的组合优化对柴油机燃烧、排放和对外做功等性能的影响.结果表明：相对正常空气进气工况,通过高压贫氧进气在保证缸内的O2量基本不变,不影响其对外输出功率情况下,能够有效降低柴油机NOx排放;0.338 3 MPa、18%O2＆82%N2进气工况下NOx排放仅3.29g/（kW·h）,能够达到船舶三阶段排放要求,而对外输出功率还略有增加;CO2对柴油机做功和NOx排放影响最为明显,水蒸汽次之,而N2对功率输出影响小、对NOx排放影响较大;高压富氮贫氧更有利于优化柴油机性能.Building a one-dimensional simulation model;which regarded a type of BW 6 S35 ME-B9 marine two-stroke diesel engines as research subject;the characteristics of combustion;emissions;power output of diesel engine affected by scavenge pressure and intake components are studied.The results show that the high pressure and oxygen-depleted intake ensure the amount of O2 in cylinder;without affecting its output power;and decrease its NOx emission.Under the condition of 0.338 3 MPa;18%O2 and 82% N2 intake;NOx emissions of engine are only 3.29 g/（kW·h）that can meet the third stage of ship emissions requirements;while its output power shows a slight increase.The influence of CO2 on the power output and NOx emission of diesel engine is the most obvious;followed by water vapor.However;N2 makes a great impact on NOx emission and smaller for output power.Therefore;the high pressure and oxygen-depleted（nitrogen-enriched）intake is more conducive to optimize diesel engines＇ performance.

关 键 词：船用柴油机 二冲程 高压进气 贫氧 燃烧 排放 

分 类 号：TK421.2[动力工程及工程热物理—动力机械及工程]