Effect of Al 2 O 3 Particle Addition on Fluidized Bed Thermochemical Heat Storage Performance of Limestone: From Instability Mitigation to Efficiency Enhancement

Hongmei Yin, Yang Liu (), Liguo Yang (), Yingjie Li, Xiaoyi Zhu, Lei Zhang, Yu Ruan, Ming Ma and Xiaoxu Fan
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Hongmei Yin: Science and Technology Research Institute, China Three Gorges Corporation, Beijing 100038, China
Yang Liu: Qinneng Qiyuan Electric Power Engineering Design Co., Ltd., Jinan 250101, China
Liguo Yang: Energy Research Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China
Yingjie Li: School of Energy and Power Engineering, Shandong University, Jinan 250061, China
Xiaoyi Zhu: Science and Technology Research Institute, China Three Gorges Corporation, Beijing 100038, China
Lei Zhang: Qinneng Qiyuan Electric Power Engineering Design Co., Ltd., Jinan 250101, China
Yu Ruan: Three Gorges Electric Power Co., Ltd., Wuhan 433000, China
Ming Ma: China Yangtze Power Co., Ltd., Wuhan 430014, China
Xiaoxu Fan: Energy Research Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China

Energies, 2025, vol. 18, issue 7, 1-13

Abstract: This study elucidates the mechanism of fluidization instability during limestone carbonation under a 100% CO 2 atmosphere and determines the influence of Al 2 O 3 fluidization aids (dosage and particle size) on exothermic performance. The experiments demonstrate that rapid CO 2 absorption in the emulsion phase, coupled with insufficient gas replenishment from the bubble phase, disrupts the balance between drag force and buoyancy, leading to localized defluidization. This instability impedes gas exchange between the bubble and emulsion phases, resulting in bubble coalescence and channeling across the bed. The fluidization instability reduces the maximum exothermic temperature and causes significant temperature heterogeneity in the bed. With repeated thermal cycles (20 cycles), the CO 2 absorption capacity of limestone diminishes (the effective conversion rate drops to 0.25), and the instability disappears. The addition of 5wt.% Al 2 O 3 (particle size: 0.05–0.075 mm) stabilizes the fluidization state during carbonation, significantly homogenizing the bed temperature distribution, with maximum and average temperature differentials reduced by 63% and 89%, respectively, compared to pure limestone systems.

Keywords: calcium looping (CaL); fluidization; limestone; exothermic performance; exothermic temperature; fluidization aid (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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