Thermal management of methanol reforming reactors for the portable production of hydrogen |
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| Affiliation: | 1. Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University, Ministry of Education, Chongqing 400044, PR China;2. College of Power Engineering, Chongqing University, Chongqing 400030, PR China;1. Department of Mechanical Engineering, Kun Shan University, No.195, Kunda Rd., Yongkang Dist., Tainan City 710, Taiwan, ROC;2. Department of Systems and Naval Mechatronic Engineering, National Cheng Kung University, Tainan City 710, Taiwan, ROC;1. Mebius d.o.o., Na Jami 3, SI-1000 Ljubljana, Slovenia;2. University of Ljubljana, Faculty of Mechanical Engineering, A?ker?eva 6, SI-1000 Ljubljana, Slovenia;3. National Institute of Chemistry Slovenia, Hajdrihova 19, SI-1000 Ljubljana, Slovenia;1. Department of Mechanical & Electrical Engineering, Xiamen University, Xiamen 361005, China;2. The State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China;3. School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China;4. Department of Mechanical Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul 133791, Republic of Korea;5. School of Materials Science & Engineering, Pusan National University, 30 Jangjeon-dong, Kumjeong-gu, Busan 609-735, Republic of Korea;1. Dept. of Mechanical & Mechatronics Engineering, University of Waterloo, Waterloo, ON N2L 3G1, Canada;2. Dept. of Chemistry and Chemical Engineering, Royal Military College of Canada, Kingston, ON K7K 7B4, Canada;3. Dept. of Mechanical Engineering, University of Akron, Akron, OH 44325-3903, United States |
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| Abstract: | Three-dimensional numerical simulations were performed to address the thermal management issues associated with the design of a methanol reforming microchannel reactor for the portable production of hydrogen. The design of the reactor was fundamentally related to the direct coupling of reforming and combustion reactions by performing them on opposite sides of dividing walls in a parallel flow configuration. Effective autothermal operation was achieved through a combination of microchannel reactor technology with heat exchange in a direction perpendicular to the reacting fluid flow. Computational fluid dynamics simulations and thermodynamic analysis were carried out to investigate the effect of various design parameters on the characteristics of the generation, consumption, and exchange of thermal energy within the system. The results indicated that the ability to control temperature and temperature uniformity is of great importance to the performance of the system. The degree of temperature uniformity favorably affects the autothermal operation of the reactor. Temperature uniformity of the reactor can be improved by controlling the rate of heat transfer through a variety of factors such as wall thermal conductivity, fluid velocities, and dimensions. High wall thermal conductivity would be greatly beneficial to the performance of the system and the temperature uniformity of the reactor. |
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| Keywords: | Hydrogen production Steam reforming Thermal management Temperature uniformity Autothermal operation Computational fluid dynamics |
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