Effect of Fluid Properties on a Rapid Super-heated Vaporization Process Using Water Containing Porous Material

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  • Fu Yan
    Department of Mechanical Engineering, Graduate School of Engineering, Kyushu University
  • Umehara Yutaro
    Department of Mechanical Engineering, Graduate School of Engineering, Kyushu University
  • Mori Shoji
    Department of Mechanical Engineering, Graduate School of Engineering, Kyushu University

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Other Title
  • 含水多孔質体を用いた急速過熱蒸気生成過程に与える流体物性の影響

Description

<p>Superheated vapor is used in several industrial fields including sterilization, desiccation, and dehydrogenating. MCH (methylcyclohexane) has been vastly utilized as hydrogen carrier under several advantages. Superheated vaporization is necessary for catalytically dehydrogenating MCH. Current superheated vapor generation methods including high-frequency induction heating and microwave heating are difficult to obtain rapid generation and shutdown responses due to the large heat capacity of the fluid in the tank and the heater. For the realization of a carbon-free society and a hydrogen-based society, we proposed a method to generate superheated vapor using porous material with rapid response and high efficiency. Vapor may be generated rapidly from the surface of porous material due to small heat capacity of liquid in the meniscus. The main objective of the present research was to experimentally investigate the performance of the vapor generator using different working fluid with different property. As a result, fluid with low latent heat had better performance in generating superheated vapor rapidly and efficiently. Considering both heat conduction and fluid advection in porous material, the energy utilization efficiency and surface temperature were analyzed by a simplified one-dimensional model. The calculated results were shown to be in good agreement with the experimental results. The proposed vapor generator is suitable for superheated vaporization in MCH method from the analysis of the model.</p>

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