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[1]刘海峰,张慧祥,王 浒,等.进气组分对低速船机NOx排放的影响[J].燃烧科学与技术,2017,(04):313-319.[doi:DOI 10.11715/rskxjs.R201605026]
 Liu Haifeng,Zhang Huixiang,Wang Hu,et al.Impact of Air Intake Components on NOx Emissionsin Low-Speed Marine Diesel Engine[J].Journal of Combustion Science and Technology,2017,(04):313-319.[doi:DOI 10.11715/rskxjs.R201605026]
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进气组分对低速船机NOx排放的影响()
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《燃烧科学与技术》[ISSN:1006-8740/CN:12-1240/TK]

卷:
期数:
2017年04
页码:
313-319
栏目:
出版日期:
2017-08-15

文章信息/Info

Title:
Impact of Air Intake Components on NOx Emissions in Low-Speed Marine Diesel Engine
作者:
刘海峰张慧祥王 浒邹 宪
天津大学内燃机燃烧学国家重点实验室,天津300072
Author(s):
Liu HaifengZhang HuixiangWang HuZou Xian
State Key Laboratory of Engines,Tianjin University,Tianjin 300072,China
关键词:
二冲程船用柴油机NOx排放废气再循环进气加湿喷油时刻
Keywords:
two-stroke marine diesel engineNOx emissionexhaust gas recirculation(EGR)humid air motor( HAM)injection time
分类号:
TK448.21
DOI:
DOI 10.11715/rskxjs.R201605026
文献标志码:
A
摘要:
使用多维数值模拟方法,研究了采用废气再循环、进气加湿耦合喷油策略改善低速二冲程船机NOx- ISFC (指示燃油消耗率)折衷关系的潜力.研究表明,EGR 的稀释效应和热效应是降低缸内燃烧温度的主要原 因,但稀释效应使得氧浓度降低,从而使得燃烧速率降低,燃烧持续期加长,导致油耗恶化;进气加湿引入量 小,因而稀释效应的作用较小,大比例加湿的热效应作用较强是降低缸内燃烧温度的主要原因,而且少量的进气 加湿对缸内燃烧过程和油耗影响较小.结果表明,EGR 率为30%,,进气加湿量与喷油量的比值为1.5,喷油时刻 为上止点后1°,CA,可在略微牺牲经济性的前提下,将NOx降低90.5%,,满足TierⅢ排放法规的要求.
Abstract:
In the current study,multi-dimensional numerical simulations are conducted to explore the potential of EGR and intake humidifying coupling with injection strategy optimization to improve the trade-off relationship of NOx-ISFC(indicated specific fuel consumption)in a low-speed two-stroke marine engine.The results show that the dilution and thermal effects of EGR are the main reasons for the lower combustion temperature. However,the oxygen concentration is also reduced as EGR increases,thus reduced combustion reaction rate,prolonged combustion duration and retarded combustion phasing are observed,resulting in deteriorated fuel economy.The dilution effect is weak for intake humidifying due to the relatively small water quantity;however,the high heat capacity of water vapor results in much stronger thermal effect,which is the main reason for the much lower combustion temperature.In addition,a small amount of air intake humidifying has a insignificant influence on combustion and fuel economy.NOx can be reduced by 90.5%,with a minor penalty on fuel economy by using 30%, EGR combined with 1.5,(water to fuel ratio)and slightly retarded SOI timing (1°,CA after the top dead center),which can meet the Tier Ⅲ emission regulations.

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备注/Memo

备注/Memo:
收稿日期:2016-09-12. 基金项目:国家科技支撑计划资助项目(2015BAG16B00). 作者简介:刘海峰(1983— ),男,博士,副教授. 通讯作者:刘海峰,haifengliu@tju.edu.cn.
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