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Simultaneous CO2 capture and heat storage by a Ca/Mg-based composite in coupling calcium looping and CaO/Ca(OH)2 cycles using air as a heat transfer fluid
Reaction Chemistry & Engineering ( IF 3.4 ) Pub Date : 2020-9-29 , DOI: 10.1039/d0re00351d
Chunxiao Zhang 1, 2, 3, 4 , Yingjie Li 1, 2, 3, 4 , Yi Yuan 1, 2, 3, 4 , Zeyan Wang 2, 4, 5, 6 , Tao Wang 4, 7, 8 , Wentao Lei 4, 7, 8
Affiliation  

The simultaneous CO2 capture and heat storage performances of the Ca/Mg-based composite prepared from carbide slag and dolomite in a process coupling calcium looping and CaO/Ca(OH)2 heat storage using air as a heat transfer fluid were investigated. In the coupling process, the spent CaO-based material experiencing multiple CO2 capture cycles was employed in the CaO/Ca(OH)2 heat storage process, and then the cycled material was again used to capture CO2. When the mass ratio of CaO/MgO in the composite is 90 : 10, it exhibits the highest heat storage capacity of 0.53 mol mol−1 and a heat storage density of 0.90 GJ t−1 after 30 heat storage cycles. The adverse effect of CO2 in air as the heat transfer fluid on CaO/Ca(OH)2 heat storage capacity is overcome by the introduction of calcium looping cycles. By introducing a calcium looping cycle after the 10th and 20th heat storage cycles, the subsequent heat storage capacities of the composite are improved by 31% and 57%, respectively. The CO2 capture reactivity of the composite is also promoted by the introduction of heat storage cycles. Therefore, the simultaneous efficient CO2 capture and heat storage using the Ca/Mg-based composite is achieved in the process coupling calcium looping and CaO/Ca(OH)2 cycles.

中文翻译:

由Ca / Mg基复合材料同时进行的二氧化碳捕集和热量存储,结合使用空气作为传热流体的钙循环和CaO / Ca(OH)2循环

研究了由钙渣和白云石制备的Ca / Mg基复合材料在以空气为传热流体的钙环化和CaO / Ca(OH)2储热耦合的过程中同时捕获CO 2和储热性能。在偶联过程中,将经历多个CO 2捕获循环的废CaO基材料用于CaO / Ca(OH)2储热过程,然后将循环后的材料再次用于捕获CO 2。当CaO / MgO的质量比为90:10时,其储热容量最高,为0.53 mol mol -1,储热密度为0.90 GJ t -1经过30个储热循环。通过引入钙循环循环,可以克服空气中作为传热流体的CO 2对CaO / Ca(OH)2的储热能力的不利影响。通过在第10个和第20个储热循环之后引入一个钙循环循环,复合材料的后续储热能力分别提高了31%和57%。通过引入储热循环也可以提高复合材料的CO 2捕获反应性。因此,在结合钙环化和CaO / Ca(OH)2循环的过程中,使用基于Ca / Mg的复合材料实现了同时高效的CO 2捕集和储热。
更新日期:2020-09-29
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