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A combined thermodynamic cycle based on methanol dissociation for IC (internal combustion) engine exhaust heat recovery

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  • Fu, Jianqin
  • Liu, Jingping
  • Xu, Zhengxin
  • Ren, Chengqin
  • Deng, Banglin

Abstract

In this paper, a novel approach for exhaust heat recovery was proposed to improve IC (internal combustion) engine fuel efficiency and also to achieve the goal for direct usage of methanol as IC engine fuel. An open organic Rankine cycle system using methanol as working medium is coupled to IC engine exhaust pipe for exhaust heat recovery. In the bottom cycle, the working medium first undergoes dissociation and expansion processes, and is then directed back to IC engine as fuel. As the external bottom cycle and the IC engine main cycle are combined together, this scheme forms a combined thermodynamic cycle. Then, this concept was applied to a turbocharged engine, and the corresponding simulation models were built for both of the external bottom cycle and the IC engine main cycle. On this basis, the energy saving potential of this combined cycle was estimated by parametric analyses. Compared to the methanol vapor engine, IC engine in-cylinder efficiency has an increase of 1.4–2.1 percentage points under full load conditions, while the external bottom cycle can increase the fuel efficiency by 3.9–5.2 percentage points at the working pressure of 30 bar. The maximum improvement to the IC engine global fuel efficiency reaches 6.8 percentage points.

Suggested Citation

  • Fu, Jianqin & Liu, Jingping & Xu, Zhengxin & Ren, Chengqin & Deng, Banglin, 2013. "A combined thermodynamic cycle based on methanol dissociation for IC (internal combustion) engine exhaust heat recovery," Energy, Elsevier, vol. 55(C), pages 778-786.
    • Handle: RePEc:eee:energy:v:55:y:2013:i:c:p:778-786
    DOI: 10.1016/j.energy.2013.04.026
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    References listed on IDEAS

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    Cited by:

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    2. Fu, Jianqin & Liu, Jingping & Wang, Yong & Deng, Banglin & Yang, Yanping & Feng, Renhua & Yang, Jing, 2014. "A comparative study on various turbocharging approaches based on IC engine exhaust gas energy recovery," Applied Energy, Elsevier, vol. 113(C), pages 248-257.
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    4. Han, Nuomin & Zhao, Dan & Schluter, Jorg U. & Goh, Ernest Seach & Zhao, He & Jin, Xiao, 2016. "Performance evaluation of 3D printed miniature electromagnetic energy harvesters driven by air flow," Applied Energy, Elsevier, vol. 178(C), pages 672-680.
    5. Panesar, Angad S. & Morgan, Robert E. & Miché, Nicolas D.D. & Heikal, Morgan R., 2013. "Working fluid selection for a subcritical bottoming cycle applied to a high exhaust gas recirculation engine," Energy, Elsevier, vol. 60(C), pages 388-400.
    6. Poran, Arnon & Tartakovsky, Leonid, 2015. "Energy efficiency of a direct-injection internal combustion engine with high-pressure methanol steam reforming," Energy, Elsevier, vol. 88(C), pages 506-514.
    7. Shu, Jun & Fu, Jianqin & Ren, Chengqin & Liu, Jingping & Wang, Shuqian & Feng, Sha, 2020. "Numerical investigation on flow and heat transfer processes of novel methanol cracking device for internal combustion engine exhaust heat recovery," Energy, Elsevier, vol. 195(C).
    8. Chen, Hao & Guo, Qi & Yang, Lu & Liu, Shenghua & Xie, Xuliang & Chen, Zhaoyang & Liu, Zengqiang, 2015. "A new six stroke single cylinder diesel engine referring Rankine cycle," Energy, Elsevier, vol. 87(C), pages 336-342.

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