Material balance and energy consumption for CO{sub 2} recovery from moist flue gas employing K{sub 2}CO{sub 3}-on-activated carbon and its evaluation for practical adaptation
- Shikoku Research Institute, Inc., Kagawa (Japan). Chemical Technology Department
Potassium carbonate supported on an activated carbon has been proposed as an efficient sorbent to recover CO{sub 2} from moist flue gases. As a characteristic of the present CO{sub 2} sorption process, which can be described as K{sub 2}CO{sub 3}{center_dot}1.5H{sub 2}O + CO{sub 2} = 2KHCO{sub 3} + 0.5H{sub 2}O, moisture in the feed gases had no influence on the CO{sub 2} sorption. By the temperature-swing operation of a fixed-bed, the CO{sub 2} recovery was achieved as follows: carbon dioxide in moist flue gases at around 363 K was sorbed by the K{sub 2}CO{sub 3} sorbent, followed by steam flushing at 433 K to release the CO{sub 2}, and then cooling the sorbent for the next CO{sub 2} sorption. In the present study employing a bench-scale apparatus, the material (CO{sub 2} and H{sub 2}O) balances, together with those of heat during each step, were measured to elucidate the CO{sub 2} sorption/release and the cooling behaviors. To evaluate the practical adaptability of this process, the heat consumption for the CO{sub 2} recovery on a commercial-scale was estimated. When compared with that for other processes such as the conventional amine process, it provided a remarkable energy-conservative effect. The cost for the CO{sub 2} recovery by K{sub 2}CO{sub 3}-on-activated carbon is also discussed. 9 refs., 7 figs., 6 tabs.
- OSTI ID:
- 20741016
- Journal Information:
- Energy and Fuels, Vol. 20, Issue 2; Other Information: nshigemoto@ssken.co.jp; ISSN 0887-0624
- Country of Publication:
- United States
- Language:
- English
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