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

doi:10.19799/j.cnki.2095-4239.2022.0077

Abstract

Abstract:

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.

Key words: thermochemical heat storage, reactor design optimization, numerical simulation, discharging

CLC Number:

TK 02

Zhongbo LI, Jingxiao HAN, Chengcheng WANG, Hui YANG, Na YANG, Shaowu YIN, Li WANG, Lige TONG, Zhiwei TANG, Yulong DING. Simulation and the parameter influence relationship of the discharging process in a thermochemical reactor[J]. Energy Storage Science and Technology, 2022, 11(7): 2133-2140.

Figures/Tables 11

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网格类型	网格数量	2.8 h反应器放热总量(数值模拟)
较粗网格	43528	6.68 MJ
中等网格	65274	6.95 MJ
较细网格	82332	7.16 MJ

参数	数值
床层孔隙率，ε_b	0.438
硅胶球热导率，λ_p/[W/(m·K)]	0.35
硅胶球密度，ρ_p/(kg/m³)	1.2×10³
亲和系数，D	0.48
活化能，E_a/(J/mol)	4.15×10⁴
指前因子，D₀/(m²/s)	1.3×10^-3
最大吸水量，W₀/kg·kg^-1	0.346
非均质参数，n	1.6
硅胶球粒径，d_p/m	4×10^-3
空气进口温度，T_in/℃	38
进口空气流速，v_a/(m/s)	0.428
进口空气相对湿度，RH/%	80

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