进气加湿与富氧对船用柴油机NOx-Soot排放的影响  

Influence of Intake Air Humidification and Oxygen-Enriched on Marine Diesel Engine NOx-Soot Emissions

作　　者：王科 赵昌普[1] 蔡玉洁 黄思睿 Wang Ke;Zhao Changpu;Cai Yujie;Huang Sirui(State Key Laboratory of Engines,Tianjin University,Tianjin 300072,China)

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

出　　处：《内燃机学报》2020年第2期133-139,共7页Transactions of Csice

基　　金：国家高技术研究发展计划(863计划)资助项目(2012AA111705);国家自然科学基金资助项目(50676067).

摘　　要：通过一台满足TierⅡ排放标准的四冲程增压中冷船用柴油机,模拟研究了富氧燃烧结合进气加湿改善NOx-soot折衷关系的潜力,并探讨了实现TierⅢ排放标准的技术路线.本研究使用AVLFire软件建立仿真模型.结果表明:单独使用富氧燃烧时,缸内温度较高,燃烧持续期较短,soot排放减少,NOx排放恶化,而单独使用进气加湿时呈相反的趋势.当发动机运行在转速为1350 r/min、75%负荷工况下,进气氧体积分数为21%~23%、加湿率为0~100%时,可实现NOx-soot排放同时降低且低于原机.氧体积分数为21%和加湿率为100%匹配,可以实现TierⅢ排放法规.两种措施的优化组合可以获得NOx-soot排放的最佳优化区域.Numerical investigation were conducted to explore the potential of oxygen-enriched combustion combined with intake air humidification to improve the trade-off relationship of NOx-soot on a four-stroke supercharged intercooled marine diesel engine.This paper also provides a solution for marine diesel engines to meet TierⅢrequirements.The simulation model was established by using AVL Fire code.The result indicates that higher incylinder temperatures and shorter combustion durations are observed,soot emissions are reduced and NOx emissions are increased when only oxygen-enriched combustion is applied,while opposite trends are found when only intake air humidification is used.The NOx-soot emissions can be reduced and lower than those of original engine under these conditions:1350 r/min of engine speed,75%load,0-100%humidity ratio and 21%-23%of intake oxygen volume fraction.As expected,it is found that 21%oxygen volume fraction and 100%humidity ratio can be matched to achieve TierⅢemission regulations.The optimal operation zone for NOx-soot emissions can be obtained by optimized combination of oxygen-enriched combustion and intake air humidification.

关 键 词：船用柴油机 富氧燃烧 进气加湿 NOx-soot排放 数值模拟 

分 类 号：TK421.5[动力工程及工程热物理—动力机械及工程]