
第39卷(2017)第6期性能与排放
柴油机 Diesel Engine
Vol.39(2017) No. 6
米勒循环结合EGR的可调两级增压柴油机性能研究
李林剑",胡志龙"2,崔毅2,邓康耀",李先南”,王新权(1.上海交通大学动力机械与工程教育部重点实验室,上海200240;
2.高新船舶与深海开发装备协同创新中心,上海200240;
3.七一一研究所,上海201108)
摘要:将米勒循环和EGR技术相结合,研究二者综合使用降低NO,排放的同时保持燃油经济性的潜力。开展了不同米勃正时结合低压和跨级EGR系统的负荷特性及推进特性工况试验,得到了推进特性和发电特性在NO,排放满足IMOTierⅢ要求下的最佳经济性控制策略。并进一步研究了针对万有特性的综合减排措施控制策略及效采。
关键词:米勃循环;废气再循环;可调两级增压;柴油机
中图分类号:TK421*.3文献标识码:A文章编号:1001-4357(2017)06-0001-05
Study on Performance of Regulated Two Stage Turbocharged Diesel Engines
Combined Miller Cycle withExhaust Gas Recirculation
Li Linjian',Hu Zhilong'2, Cui Yi'-2,Deng Kangyao'-2,Li Xiannan',Wang Xinquan
(1. Key Laboratory for Power Machinery and Engineering of Ministry of Education, Shanghai Jiao Tong University,
Shanghai 200240; 2. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai 200240; 3.Shanghai Marine Diesel Engine Research Institute,Shanghai 201108)
Abstract: EGR and Miller cycle were combined to study its potential on reducing the NO, emission and maintain the fuel efficiency at the same time. The control strategies for optimized fuel efficiency under the constraints of IMO Tier III NO, emission regulation were obtained by engine propulsion and generation characteristics tests, which were carried out under various combination of Miller timing and EGR type and degrees. The combined control strategies and its effect regarding to universal characteristics were also studied.
Key words: Miller cycle; exhaust gas recirculation; regulated two stage turbocharging; diesel engine
0引言
国际海事组织(IMO)第三阶段船用柴油机 NO,排放法规已于2016年开始强制实施。为了应对IMOTierⅢ排放法规并提高燃油经济性,采用的主要技术有:两级增压(1-2)、米勒循环[34]、废气再循环[56]、后处理[74]、代用燃料[9-10]以及余热能回收[1-12]等。
米勒循环通过进气门早关或晚关,使有效压缩
比小于膨胀比,从而降低了压缩终点温度,达到缸内低温效果,是一种能同时改善内燃机热效率和 NO,排放的技术手段,目前已受到越来越广泛的关注。然而随着排放法规越来越严格,单独使用米勒循环技术已无法达到现行法规对NO,排放的要求。 EGR技术能显著抑制柴油机缸内NO,的生成,但是大EGR率将导致燃油消耗显著恶化t13],所以在保持燃油经济性的同时,仅使用EGR技术也很难满足TierⅢNO,排放标准。
收稿日期:2017-06-28;修回日期:2017-07-13
作者简介:李林剑(1991-),男,研究生,主要研究方向为内燃机结构与性能设计,E-mail:401157845@q9.com。