The CaO/Ca(OH)2 thermochemical energy storage system can store heat through reversible reactions for long term and transport energy for long distance, and thus can solve the mismatching between energy supply and demand. In this study, a one-dimensional model is developed for the physical–chemical–thermal processes during the hydration reaction of CaO/Ca(OH)2 system in an indirect fixed bed reactor, and the corresponding governing equations are solved by the tridiagonal matrix method with self-developed program parallelized by Message Passing Interface. The characteristics and complicated coupling mechanisms of the vapor flow, heat transfer, mass transport and reaction processes are analyzed. Then effects of inlet pressure, convective heat transfer, reactant porosity, reactant permeability and reactor size on the reaction performance are discussed, respectively. It is found that higher inlet pressure, heat transfer coefficient, permeability and porosity can enhance the heat and mass transfer processes, thus accelerating the reaction efficiently. Finally, the reaction performance under different conditions is comprehensively evaluated by four indicators including the reaction time, average power, temperature plateau duration and standard deviation.

中文翻译：

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间接反应器中氧化钙/氢氧化钙系统水合反应过程中物理-化学-热过程的数值模拟

CaO/Ca(OH)2热化学储能系统可以通过可逆反应长期储存热量和长距离输送能量，从而解决能源供需不匹配的问题。本研究建立了间接固定床反应器中 CaO/Ca(OH)2 体系水化反应过程中物理-化学-热过程的一维模型，并通过三对角矩阵求解相应的控制方程通过消息传递接口并行化自行开发的程序的方法。分析了蒸汽流动、传热、传质和反应过程的特点和复杂的耦合机制。然后讨论了入口压力、对流传热、反应物孔隙率、反应物渗透率和反应器尺寸对反应性能的影响，分别。结果表明，较高的入口压力、传热系数、渗透率和孔隙率可以增强传热和传质过程，从而有效地加速反应。最后，通过反应时间、平均功率、温度平台持续时间和标准偏差四个指标综合评价不同条件下的反应性能。