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Performance Study on Methanol Steam Reforming Rib Micro-Reactor with Waste Heat Recovery

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  • Guoqiang Wang

    (Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University, Ministry of Education, Chongqing 400044, China
    School of Energy and Power Engineering, Chongqing University, Chongqing 400030, China)

  • Feng Wang

    (Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University, Ministry of Education, Chongqing 400044, China
    School of Energy and Power Engineering, Chongqing University, Chongqing 400030, China)

  • Bohong Chen

    (School of Energy and Power Engineering, Chongqing University, Chongqing 400030, China)

Abstract

Automobile exhaust heat recovery is considered to be an effective means to enhance fuel utilization. The catalytic production of hydrogen by methanol steam reforming is an attractive option for onboard mobile applications, due to its many advantages. However, the reformers of conventional packed bed type suffer from axial temperature gradients and cold spots resulting from severe limitations of mass and heat transfer. These disadvantages limit reformers to a low efficiency of catalyst utilization. A novel rib microreactor was designed for the hydrogen production from methanol steam reforming heated by automobile exhaust, and the effect of inlet exhaust and methanol steam on reactor performance was numerically analyzed in detail, with computational fluid dynamics. The results showed that the best operating parameters were the counter flow, water-to-alcohol (W/A) of 1.3, exhaust inlet velocity of 1.1 m/s, and exhaust inlet temperature of 773 K, when the inlet velocity and inlet temperature of the reactant were 0.1 m/s and 493 K, respectively. At this condition, a methanol conversion of 99.4% and thermal efficiency of 28% were achieved, together with a hydrogen content of 69.6%.

Suggested Citation

  • Guoqiang Wang & Feng Wang & Bohong Chen, 2020. "Performance Study on Methanol Steam Reforming Rib Micro-Reactor with Waste Heat Recovery," Energies, MDPI, vol. 13(7), pages 1-18, March.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:7:p:1564-:d:338022
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    References listed on IDEAS

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    2. Zhang, Huajing & Xu, Chao & Yu, Hangyu & Wu, Hao & Jin, Fei & Xiao, Feng & Liao, Zhirong, 2022. "Enhancement of methanol steam reforming in a tubular fixed-bed reactor with simultaneous heating inside and outside," Energy, Elsevier, vol. 254(PB).
    3. Pashchenko, Dmitry, 2022. "Natural gas reforming in thermochemical waste-heat recuperation systems: A review," Energy, Elsevier, vol. 251(C).
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    5. Marcin Dębowski & Magda Dudek & Marcin Zieliński & Anna Nowicka & Joanna Kazimierowicz, 2021. "Microalgal Hydrogen Production in Relation to Other Biomass-Based Technologies—A Review," Energies, MDPI, vol. 14(19), pages 1-27, September.

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