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Collaborative optimization of exhaust gas recirculation and Miller cycle of two-stage turbocharged marine diesel engines based on particle swarm optimization

基于粒子群算法的两级增压船用柴油机EGR与Miller协同优化研究

  • The 2nd World Congress on Internal Combustion Engines
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Abstract

To meet increasingly stringent emission standards and lower the brake-specific fuel consumption (BSFC) of marine engines, a collaborative optimization study of exhaust gas recirculation (EGR) and a Miller cycle coupled turbocharging system was carried out. In this study, a one-dimensional numerical model of the EGR, Miller cycle, and adjustable two-stage turbocharged engine based on WeiChai 6170 marine diesel engine was established. The particle swarm optimization algorithm was used to achieve multi-input and multi-objective comprehensive optimization, and the effects of EGR-coupled Miller regulation and high-pressure turbine bypass regulation on NOx and BSFC were investigated. The results showed that a medium EGR rate-coupled medium Miller degree was better for the comprehensive optimization of NOx and BSFC. At medium EGR rate and low turbine bypass rates, NOx and BSFC were relatively balanced and acceptable. Finally, an optimal steady-state control strategy under full loads was proposed. With an increase in loads, the optimized turbine bypass rate and Miller degree gradually increased. Compared with the EGR-only system, the optimal system of EGR and Miller cycle coupled turbine bypass reduced NOx by 0.87 g/(kW·h) and BSFC by 17.19 g/(kW·h) at 100% load. Therefore, the EGR and Miller cycle coupled adjustable two-stage turbocharging achieves NOx and BSFC optimization under full loads.

摘要

为了符合日益严格的排放法规和提高柴油机效率,本文开展了船用柴油机EGR米勒循环耦合两级增压系统协同优化研究。首先,以潍柴6170 船用柴油机为研究对象,建立EGR、米勒循环和可调两级增压柴油机的一维数值模型。然后,采用粒子群算法进行油耗和排放综合最优的多输入多目标优化研究,研究EGR耦合米勒调节和EGR耦合高压级涡轮旁通调节对NOx排放和油耗的耦合调节规律。结果表明,中等EGR率耦合中等米勒度对于NOx排放和油耗的协同优化效果更好,在中等EGR率和低涡轮旁通率下,NOx排放和油耗综合较优。最后,基于耦合调节规律,提出了全负荷下最优稳态控制策略。随着负荷的增加,优化的涡轮旁通率和米勒度逐渐增大。与仅使用EGR的系统相比,EGR和米勒循环耦合涡轮旁通的优化系统在100%负荷下NOx排放降低0.87 g/(kW·h),油耗降低17.19 g/(kW·h)。 EGR和米勒循环耦合可调两级涡轮增压可以实现全负荷下NOx和油耗的综合优化。

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Authors and Affiliations

  1. School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China

    Xu-yang Tang  (汤旭阳), Peng Wang  (王捧), Lei Shi  (石磊) & Kang-yao Deng  (邓康耀)

  2. WeiChai Power Co., Ltd., Weifang, 261001, China

    Zhong-yuan Zhang  (张忠元) & Feng-li Zhang  (张凤丽)

Authors
  1. Xu-yang Tang  (汤旭阳)
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  2. Peng Wang  (王捧)
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  3. Zhong-yuan Zhang  (张忠元)
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  4. Feng-li Zhang  (张凤丽)
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  5. Lei Shi  (石磊)
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  6. Kang-yao Deng  (邓康耀)
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Contributions

SHI Lei provided the funds and edited the draft of manuscript. TANG Xu-yang conducted the investigation and wrote the first draft of the manuscript. WANG Peng analyzed the data and edited the figures of the manuscript. ZHANG Zhong-yuan and ZHANG Feng-li built engine bench and provided experimental data. DENG Kang-yao edited the draft of manuscript. All authors replied to reviewers’ comments and revised the final version.

Corresponding author

Correspondence to Lei Shi  (石磊).

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Conflict of interest

TANG Xu-yang, WANG Peng, ZHANG Zhong-yuan, ZHANG Feng-li, SHI Lei, and DENG Kang-yao declare that they have no conflict of interest.

Foundation item: Project(K16011) supported by the Marine Low-speed Engine Project-Phase I, China

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Tang, Xy., Wang, P., Zhang, Zy. et al. Collaborative optimization of exhaust gas recirculation and Miller cycle of two-stage turbocharged marine diesel engines based on particle swarm optimization. J. Cent. South Univ. 29, 2142–2156 (2022). https://doi.org/10.1007/s11771-022-5082-x

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