Process for capturing CO{sub 2} arising from the calcination of the CaCO{sub 3} used in cement manufacture
- Instituto Nacional del Carbon, INCAR-CSIC, Oviedo (Spain)
This paper outlines a new CaCO{sub 3} calcination method for producing a stream of CO{sub 2} (suitable for permanent geological storage after purification and compression). The process is based on the use of very hot CaO particles (T {gt} 1000{sup o}C) to transfer heat from a circulating fluidized bed combustor (CFBC) to a calciner (fluidized with CO{sub 2} and/or steam). Since the fluidized bed combustor and calciner have separate atmospheres, the CO{sub 2} resulting from the decomposition of CaCO{sub 3} can be captured, while the CO{sub 2} generated in the combustion of the fuel in air is emitted to the atmosphere. We demonstrate that with this system it is possible to reduce the CO{sub 2} emissions of a cement plant by around 60%. Furthermore, since the key pieces of equipment are similar to the commercial CFBCs used in power generation plants, it is possible to establish the additional investment required for the system and to estimate the cost per ton of CO{sub 2} avoided for this process to be about 19 $/tCO{sub 2} avoided. 19 refs., 4 figs.
- OSTI ID:
- 21107580
- Journal Information:
- Environmental Science and Technology, Vol. 42, Issue 18; Other Information: abanades@incar.csic.es; ISSN 0013-936X
- Country of Publication:
- United States
- Language:
- English
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