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

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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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