耦合相变储热的金属氢化物反应器吸氢过程模拟

doi:10.12034/j.issn.1009-606X.217438

摘要/Abstract

摘要： 基于金属氢化物储氢反应，建立了相变材料蓄热的固体储氢反应器模型，模拟研究了吸氢压力等操作参数及相变材料的相变温度、固(液)态导热系数、相变潜热等物性参数对固体储氢反应器工作过程的影响. 结果表明，相变材料的固态导热系数和相变潜热对固体储氢反应器性能的影响较小，相变温度和液态导热系数对反应器性能影响较大. 相变温度越低，液态导热系数越大，储氢反应器性能越好. 在使用最优的相变材料储能时，提高充入氢气的压力可加快反应速率，强化相变材料的传热，有助于进一步优化反应器的储氢性能.

关键词: 相变材料, 金属氢化物反应器, 数值模拟, 储氢性能, 参数优化

Abstract: A transient two-dimensional mathematical model of solid-state hydrogen storage reactor coupled with phase-change material (PCM) as heat exchanger was developed on the basis of metal hydride hydrogen absorption reactions. The influences of the operating and thermophysical parameters, including the initial hydrogen pressure, the PCM melting temperature, PCM solid (liquid) thermal conductivity and melting enthalpy, on the hydrogen absorption performances of the reactor were further investigated. The simulation results showed that different thermophysical parameters of PCM affect the reactor performance in varying degrees. The influences of the PCM solid thermal conductivity and melting enthalpy on the hydrogen absorption behavior of the reactor were small, while the PCM melting temperature and liquid thermal conductivity had a great impact on the hydrogen absorption process. It was found that the hydrogen storage reactor presented an improved hydrogen absorption behavior when the PCM melting temperature was reduced or the PCM liquid thermal conductivity becomes large. This is because that both the reduction of the PCM melting temperature and the increase of the PCM liquid thermal conductivity help to enhance the heat transfer between metal hydride and PCM, thus facilitating the hydrogen absorption reaction in the reactor. By contrast, the larger PCM solid thermal conductivity only accelerates the temperature rise process of the PCM and has few influences on the hydrogen absorption reaction of metal hydride. Besides the thermophysical parameters of PCM, the operating parameter such as hydrogen pressure also presents a great impact on the reactor performance. Improving the hydrogen pressure under the conditions of the optimized PCM thermophysical properties contributes to the improvement of the reaction rate, which subsequently enhances the heat transfer between metal hydride and PCM. Through the parametric analyses, the key affecting parameters and their optimization strategy are obtained for the metal hydride reactor coupled with the PCM as heat exchanger, which is significant and valuable for the development of advanced hydrogen storage reactors.

Key words: phase change material, metal hydride reactor, numerical simulation, hydrogen storage, parameter optimization

尧兢朱鹏飞任佳伟吴震. 耦合相变储热的金属氢化物反应器吸氢过程模拟[J]. 过程工程学报, 2018, 18(5): 1093-1101.

Jing YAO Pengfei ZHU Jiawei REN Zhen WU. Simulation on hydrogen absorption process of metal hydride based hydrogen storage reactor coupled with phase-change thermal storage[J]. Chin. J. Process Eng., 2018, 18(5): 1093-1101.

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