热化学反应器放热过程模拟及参数影响规律  

Simulation and the parameter influence relationship of the discharging process in a thermochemical reactor

作　　者：李仲博[1] 汉京晓 王成成 杨慧 杨娜 尹少武 王立 童莉葛 唐志伟[4] 丁玉龙[5] LI Zhongbo;HAN Jingxiao;WANG Chengcheng;YANG Hui;YANG Na;YIN Shaowu;WANG Li;TONG Lige;TANG Zhiwei;DING Yulong(Beijing District Heating Group,Beijing 100028,China;School of Energy and Environmental Engineering,University of Science and Technology Beijing,Beijing 100083,China;Beijing Key Laboratory for Energy Saving and Emission Reduction in Metallurgical Industry,Beijing 100083,China;Beijing University of Technology,Beijing 100022,China;School of Chemical Engineering,University of Birmingham,Birmingham B152TT,UK)

机构地区：[1]北京市热力集团有限责任公司,北京100028 [2]北京科技大学能源与环境工程学院,北京100083 [3]冶金工业节能减排北京市重点实验室,北京100083 [4]北京工业大学环能学院,北京100022 [5]英国伯明翰大学储能中心,英国伯明翰B152TT

出　　处：《储能科学与技术》2022年第7期2133-2140,共8页Energy Storage Science and Technology

摘　　要：热化学储热因其具有储热密度高、存储过程几乎无热量损失等优点在推动可再生能源的利用、助力实现“双碳”目标中具有重要作用,其中热化学反应器的设计及性能优化是重要环节。本文对以硅胶球为储热材料的热化学反应器进行了放热实验,并建立了二维仿真模型。通过调整模型参数中硅胶球最大吸水量、亲和系数、非均质参数及指前因子和活化能等参数使数值模拟和实验的反应器出口温度结果具有良好的一致性。参数中对空气出口温度影响较大的有亲和系数、非均质参数及硅胶球最大吸水量,比热容的影响最小,指前因子对空气出口温度的影响大于活化能。其中非均质参数由1.2增大至2.8时,空气最高出口温度由140℃降低至70℃。增大硅胶球的比热容在降低反应器最高出口温度的同时,还有助于延长到达最高出口温度的时间。该研究结果结合小型反应器实验数据可以对大规模储热装置多次充放热循环后的性能进行更加准确地预测,进而优化反应器及系统设计。Thermochemical heat storage plays an important role in promoting utilization of renewable energy and achieving the "double carbon" goal due to its high heat storage density and nearly zero heat loss in the storage process. Thus, the design and performance optimization of thermochemical reactors are important. In this paper, we describe a two-dimensional simulation model constructed to investigate thermochemical reactor discharge using silica-gel as a heat storage material. By adjusting the model’s parameters, e. g., the maximum water absorption, affinity coefficient, inhomogeneity, the preexponential factor, and the activation energy of the silica gel sphere, the results of a numerical simulation and experiment at reactor outlet temperature were in good agreement. We found that the affinity coefficient parameter,inhomogeneity parameter, and maximum water absorption of the silica gel sphere had more influence on the air outlet temperature among all considered parameters. The specific heat capacity was the least. When the heterogeneity parameter was increased from 1.2 to 2.8, the maximum air outlet temperature decreased from 140 ℃ to 70 ℃. The pre-exponential factor was found to have greater influence on air outlet temperature than activation energy. In addition, increasing the specific heat capacity of the silica gel reduced the maximum outlet temperature of the reactor and helped prolong the time required to reach the maximum outlet temperature. Combined with the experimental data of a small-scale reactor, the performance of a large-scale heat storage device can be predicted accurately after multiple charge and discharge cycles. Thus, the reactor and system design can be optimized.

关 键 词：热化学储热 反应器设计优化 数值模拟 放热 

分 类 号：TK02[动力工程及工程热物理]