Simultaneous CO2 capture and thermochemical heat storage by modified carbide slag in coupled calcium looping and CaO/Ca(OH)2 cycles

doi:10.1016/j.cjche.2020.09.026

Abstract

Abstract: The simultaneous CO₂ capture and heat storage performances of the modified carbide slag with by-product of biodiesel were investigated in the process coupled calcium looping and CaO/Ca(OH)₂ thermochemical heat storage using air as the heat transfer fluid. The modified carbide slag with by-product of biodiesel exhibits superior CO₂ capture and heat storage capacities in the coupled calcium looping and heat storage cycles. The hydration conversion and heat storage density of the modified carbide slag after 30 heat storage cycles are 0.65 mol·mol^-1 and 1.14 GJ·t^-1, respectively, which are 1.6 times as high as those of calcined carbide slag. The negative effect of CO₂ in air as the heat storage fluid on the heat storage capacity of the modified carbide slag is overcome by introducing CO₂ capture cycles. In addition, the CO₂ capture reactivity of the modified carbide slag after the multiple calcium looping cycles is enhanced by the introduction of heat storage cycles. By introducing 10 heat storage cycles after the 10th and 15th CO₂ capture cycles, the CO₂ capture capacities of the modified carbide slag are subsequently improved by 32% and 43%, respectively. The porous and loose structure of modified carbide slag reduces the diffusion resistances of CO₂ and steam in the material in the coupled process. The formed CaCO₃ in the modified carbide slag as a result of air as the heat transfer fluid in heat storage cycles decomposes to regenerate CaO in calcium looping cycles, which improves heat storage capacity. Therefore, the modified carbide slag with by-product of biodiesel seems promising in the coupled calcium looping and CaO/Ca(OH)₂ heat storage cycles.

Key words: Carbide slag, Calcium looping, CaO/Ca(OH)₂ heat storage, Modification, By-product of biodiesel, CO₂ capture

摘要： The simultaneous CO₂ capture and heat storage performances of the modified carbide slag with by-product of biodiesel were investigated in the process coupled calcium looping and CaO/Ca(OH)₂ thermochemical heat storage using air as the heat transfer fluid. The modified carbide slag with by-product of biodiesel exhibits superior CO₂ capture and heat storage capacities in the coupled calcium looping and heat storage cycles. The hydration conversion and heat storage density of the modified carbide slag after 30 heat storage cycles are 0.65 mol·mol^-1 and 1.14 GJ·t^-1, respectively, which are 1.6 times as high as those of calcined carbide slag. The negative effect of CO₂ in air as the heat storage fluid on the heat storage capacity of the modified carbide slag is overcome by introducing CO₂ capture cycles. In addition, the CO₂ capture reactivity of the modified carbide slag after the multiple calcium looping cycles is enhanced by the introduction of heat storage cycles. By introducing 10 heat storage cycles after the 10th and 15th CO₂ capture cycles, the CO₂ capture capacities of the modified carbide slag are subsequently improved by 32% and 43%, respectively. The porous and loose structure of modified carbide slag reduces the diffusion resistances of CO₂ and steam in the material in the coupled process. The formed CaCO₃ in the modified carbide slag as a result of air as the heat transfer fluid in heat storage cycles decomposes to regenerate CaO in calcium looping cycles, which improves heat storage capacity. Therefore, the modified carbide slag with by-product of biodiesel seems promising in the coupled calcium looping and CaO/Ca(OH)₂ heat storage cycles.

关键词: Carbide slag, Calcium looping, CaO/Ca(OH)₂ heat storage, Modification, By-product of biodiesel, CO₂ capture

Chunxiao Zhang, Yingjie Li, Zhiguo Bian, Wan Zhang, Zeyan Wang. Simultaneous CO₂ capture and thermochemical heat storage by modified carbide slag in coupled calcium looping and CaO/Ca(OH)₂ cycles[J]. Chinese Journal of Chemical Engineering, 2021, 36(8): 76-85.

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Simultaneous CO₂ capture and thermochemical heat storage by modified carbide slag in coupled calcium looping and CaO/Ca(OH)₂ cycles

Simultaneous CO₂ capture and thermochemical heat storage by modified carbide slag in coupled calcium looping and CaO/Ca(OH)₂ cycles

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