基于熔融盐加热的甲烷蒸汽重整制氢反应器的熵产生率和氢气产率分析

Entropy Generation Rate and Hydrogen Production Rate Analyses for Steam Methane Reforming Reactor Heated by Molten Salt

太阳能热化学储能能够有效解决太阳能时间和空间分布不均的问题。在工业甲烷蒸汽重整反应器模型的基础上,利用有限时间热力学理论建立了基于熔融盐加热的甲烷蒸汽重整反应器(steam methane reforming reactor heated by molten salt,MS-SMRR)模型,得到了MS-SMRR的设计参数,并分析了MS-SMRR的几何参数和操作参数对氢气产率和总熵产生率的影响规律。结果表明:在氢气产率一定时,逆流参考反应器比顺流参考反应器的总熵产生率低,且消耗的熔融盐少;增大熔融盐进口温度和减小反应混合物进口压力能够显著提高MS-SMRR的氢气产率。研究结果对实际MS-SMRR的优化设计具有一定的理论指导意义。

Solar thermochemical energy storage can effectively solve the uneven distribution of solar energy in time and space.Based on the model of industrial methane steam reforming reactor,the model of steam methane reforming reactor heated by molten salt(MS-SMRR)was established by using finite time thermodynamics,and the design parameters of MS-SMRR were obtained.The effects of geometric parameters and operation parameters of MS-SMRR on hydrogen production and total entropy production were analyzed.The results indicate that the total entropy generation rate and the consumption of the molten salt in a counter-flow reference reactor are smaller than those in a parallel-flow reference reactor when the hydrogen production rate is constant.The hydrogen production rate can be enhanced observably by increasing the inlet temperature of the molten salt and decreasing the inlet pressure of the mixture gas.The research results have certain theoretical guiding significance for the optimization design of actual MS-SMRR.