4.6 Article

The Ca-Cu looping process using natural CO2 sorbents in a packed bed: Operation strategies to accommodate activity decay

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CHEMICAL ENGINEERING SCIENCE
卷 273, 期 -, 页码 -

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PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2023.118659

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Calcium looping; Chemical looping combustion; Packed-bed reactor; Modelling; Hydrogen; CO2 capture

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This study proposes a novel strategy for packed-bed Ca-Cu looping processes, which involves loading a sufficient amount of CuO to calcine only a specific fraction of CaCO3 during each cycle until the limestone reaches a residual conversion of 0.06. This strategy ensures temperatures below 900°C during operation, and the excess CaCO3 in the bed can adsorb CO2. The feasibility of this strategy is simulated for the conversion of blast furnace gas into a H2-rich product and a separated CO2 rich gas.
The Ca-Cu looping process is a promising CO2 capture technology designed to produce H2 and power from a fuel gas. The use of inexpensive and widely available limestone would facilitate the scale up of this technology. This work proposes a novel strategy for packed-bed Ca-Cu looping processes consisting of loading the sufficient amount of CuO to calcine only a well-defined fraction of CaCO3 in every cycle during the transient period until the limestone reaches a residual solid conversion of 0.06 (typically after 150- 200 cycles). In this way, the excess of CaCO3 in the bed ensures temperatures below 900 & DEG;C during operation. The feasibility of this strategy is simulated for the conversion of blast furnace gas (BFG) into a H2rich product (35 vol%) diluted in N2 via the Ca-Cu looping process at 2 bar and temperatures between 600 and 850 & DEG;C, while a separated CO2 rich gas (55 vol% CO2 in N2) is obtained. & COPY; 2023 Elsevier Ltd. All rights reserved.

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