第35卷(2013)第5期性能与排放
柴油机 Diesel Engine
进气加湿结合米勒循环降低船用中速
柴油机NO.排放的研究
刘瑞，孙强，平涛，胡必柱（七-*一研究所，上海201108）
VoL 35(2013)No.5
摘要：针对某型满足TierⅡ排放法规的船用中速柴油机，采用试验设计分析了进气含湿量、喷油正时、米勒强度对柴油机NO.排放量、燃油消耗率等参数的影响权重及各因素间交互效应的大小；并对75%负荷工况下，进气加湿和米勒循环的组合方式进行了优化。研究结果表明：进气加湿是一种NO，降排潜力大，对Soot排放量和燃油消耗率影响小的降排技术：进气加湿、米勘循环的NO，降低量可在其组合应用时进行线性叠加；目标机型在75%负荷工况下，要使 NO，降低75%，48.92（gkg""）的进气含湿量、下止点前38°CA的米勒强度为最佳组合方式。
关键词：船用柴油机；进气加湿；米勒循环；NO 中图分类号：TK421*.5
文献标识码：A
文章编号：1001-4357(2013)05-0007-05
NOReductionbyCombinationofChargeAirHumidificationand
Miller Cycle on a Medium Speed Marine Diesel Engine
Liu Rui,Sun Qiang,Ping Tao, Hu Bizhu
(Shanghai MarineDiesel Engine Research Institute，Shanghai 201108)
Abstract:Aiming at a medium speed marine diesel engine which meets IMO Tierll, the effect weight of charge air humidity, injection timing and Miller strength on NO, emission, brake specific fuel consumption, etc. was in-vestigated via design of experiments, as well as the interaction between the experiment factors. The combination strategy of charge air humidification and Miller cycle was optimized under 75% load. The research results show charge air humidification can reduce NO, emission effectively, whereas has little effect on Soot emission and brake specific fuel consumption; the NO, reduced by charge air humidification and Miller cycle can plus linearly when they are used together; to reduce 75% NO, emission, charge air huimidity with the 48. 92 (g-kg'') and Miller
cycle with IVC 38 °CA b.BDC is the best combination strategy under 75% load. Keywords: marine diesel engine; charge air humidification;Miller cycle; NO,
0引言
面对日益严格的船用柴油机排放法规，采用单一的机内NO，降排技术达到法规要求已越来越困难，而不同减排技术的组合应用或将成为未来满足 IMOTierⅢ及更为严昔排放法规的重要技术手段。进气加湿、米勒循环均可有效降低柴油机的NO。
排放。本文着重研究这两种技术的组合应用对船用中速柴油机各性能及排放参数的影响，并对其组合应用方案进行优化。
计算模型的建立
本文研究对象为某船用中速柴油机，该机型满足当前IMOTierⅡ排放法规要求。为达标Tier
收稿日期：2013-06-19
作奢简介：刘瑞（1989-），男，在读硕士，主要研究方向为船用荣油机燃烧与排放控制，E-mail：liuruicool@.yeah.net。