基于热化学储热的废气余热回收

doi:10.3976/j.issn.1002-4026.20240086

Abstract

Abstract:

To address the energy shortages problem, in addition to developing new and renewable energy sources, the recovery and utilization of waste heat resources have gained increasing attention, particularly low-grade industrial waste heat. Traditional integrated waste heat adsorption beds suffer from slow heat transfer and uneven temperature distribution, severely limiting the efficiency of waste heat storage. This study proposes a staggered adsorption bed that utilizes thermochemical hydration salts for low-grade waste heat recovery. Results show that the heat-storage rate of this adsorption bed is three times that of traditional adsorption beds. In terms of the heat transfer, it effectively mitigates the issue of uneven heating duration of materials across the adsorption bed. In terms of the mass transfer, a multidirectional mass transfer reduces the contact time between water vapor and materials, avoiding conditions for the secondary hydration of heat-storage materials. Therefore, the “staggered adsorption bed” has unique advantages in heat and mass transfer, providing a novel approach for the design and improvement of adsorption heat-storage beds for waste heat recovery.

Key words: low-grade waste heat, hydrated salts, heat storage, heat and mass transfer

CLC Number:

TK02

DONG Zhaoyi, WANG Cong. Research on waste heat recovery using thermochemical heat-storage materials[J].Shandong Science, 2025, 38(4): 118-129.

Figures/Tables 10

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References 22

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项目名称	域单元/个	边界单元/个	边单元/个	吸附床中心点温度/K	吸附床中心点速度/(m·s^-1)
Case1	57 956	7 872	727	358.45	0.045 2
Case2	80 270	9 356	810	358.73	0.045 5
Case3	127 346	16 908	1 114	358.85	0.045 7
Case4	182 988	15 560	1 028	358.90	0.045 8

Research on waste heat recovery using thermochemical heat-storage materials

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