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Carbon Capture and Sequestration (CCS) technology to slow global warming is a challenge to be solved worldwide. In this study, a dual circulating fluidized bed process using a solid-sorbent was developed for the post-combustion CO2 capture process from a pulverized coal power plant. This solid-sorbent-based CO2 capture process consists of absorber, regenerator, and standpipes in between them. An amine-functionalized silica was utilized as a solid-sorbent, and a bench-scale facility capable of treating flue gas of 20 Nm3/hr was constructed for the performance verification. As a result, when the sorbent to CO2 ratio was 24.6 wt/wt%, a CO2 capture efficiency of 80% or more was obtained, and the maximum CO2 working capacity was 4.5 wt%. A long-term stability was verified in the bench-scale facility and, as a result, the sorption capacity decreased by 5% for about 800 cycles. In addition, a solid-solid indirect heat exchanger was applied at the upper part of the absorber to partially recover solid sensible energy to reduce the regeneration energy. The sorbent loading inside the tube affects the heat transfer efficiency, and the heat transfer coefficient ranges from 8 to 10.5 W/m2-K. |
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