| 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NOx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NOx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、米勒循环的NOx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NOx降低75%,48.92(gkg-1)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 NOx |
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| NOx Reduction by Combination of Charge Air Humidification andMiller Cycle on a Medium Speed Marine Diesel Engine |
| Liu Rui,Sun Qiang,Ping Tao,Hu Bizhu |
| Shanghai Marine Diesel Engine Research Institute, Shanghai 201108 |
| Abstract:Aiming at a medium speed marine diesel engine which meets IMO TierⅡ,the effect weight of charge air humidity, injection timing and Miller strength on NOx emission, brake specific fuel consumption, etc. was investigated 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 NOx emission effectively, whereas has little effect on Soot emission and brake specific fuel consumption; the NOx reduced by charge air humidification and Miller cycle can plus linearly when they are used together; to reduce 75% NOx emission, charge air humidity with the 48.92(gkg-1) and Miller cycle with IVC 38°CA b.BDC is the best combination strategy under 75% load. |
| Key words: marine diesel engine charge air humidification Miller cycle NOx〖FL |
