储能科学与技术

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氧化钙-氢氧化钙热化学储热系统放热数值分析

邓畅,潘智豪,闫君,赵长颖*   

  1. 上海交通大学工程热物理研究所,上海200240
  • 出版日期:2017-12-11 发布日期:2017-12-11
  • 通讯作者: 赵长颖,教授,主要研究方向为多孔介质传热、热辐射、微纳尺度传热及储热,E-mail:changying.zhao@sjtu.edu.cn
  • 作者简介:邓畅(1993—),硕士研究生,主要从事热化学储热理论与技术研究
  • 基金资助:
    国家重点基础研究发展计划(No.2013CB228303)及国家自然科学基金(No.51706130)

Numerical study on exothermic process of CaO-Ca(OH)2 thermochemical heat storage system

DENG Chang, PAN Zhihao, YAN Jun, ZHAO Changying   

  1. Institute of Engineering Thermophysics, Shanghai Jiao Tong University, Shanghai 200240, China
  • Online:2017-12-11 Published:2017-12-11

摘要: 热化学储热与显热、潜热储热相比,储热密度高且能够实现常温下季节性储热。基于氧化钙-氢氧化钙热化学储热系统,建立了二维轴对称非稳态气固化学反应模型,对直接传热式氧化钙-氢氧化钙储热装置的放热过程进行了研究,并分析了压力、流量、床体孔隙率、床体高度等参数对放热过程的影响。该模型耦合了气固化学反应、多孔介质内的传热传质和流体流动。模拟结果表明:在反应床内存在一个反应速率较快的区域,随着放热的进行该区域由入口逐渐向出口移动;压力、流量分别是影响出口温度、放热功率的主要因素;改变反应物高度,系统的最大放热功率不变。

关键词: 热化学储热, 氢氧化钙, 数值计算

Abstract:

Compared to sensible and latent heat storage, thermochemical heat storage has high heat storage density and can achieve seasonal heat storage at ambient temperature. In order to design the reactor and choose optimal reaction condition, the exothermic process of CaO-Ca(OH)2 heat storage system must be examined. Based on the thermal behavior of CaO-Ca(OH)2 heat storage system, a 2D axisymmetric time dependent model is developed to study the exothermic process, and the effect of different reaction conditions and reaction bed parameters on exothermic process of CaO-Ca(OH)2 heat storage system is investigated systematically. The results indicate that there is a rapid reaction zone in the reaction bed and the exothermic reaction moves from the inlet to the outlet. The outlet temperature is mainly influenced by steam pressure and the reaction exothermic power is mainly influenced by flow rate. Low porosity has little effect on the maximum exothermic power and the height of reaction bed has no effect on the maximum reaction exothermic power. The result of this study provides systematical insight into the application of Cao-Ca(OH)2 thermochemical heat storage system.

Key words: thermochemical heat storage, calcium hydroxide, numerical computation