Limestone calcination with CO{sub 2} capture (II): decomposition in CO{sub 2}/steam and CO{sub 2}/N{sub 2} atmospheres
- National Institute of Advanced Industrial Science and Technology, Ibaraki (Japan)
Decomposition of limestone particles (0.25-0.5 mm) in a steam dilution atmosphere (20-100% steam in CO{sub 2}) was investigated by using a continuously operating fluidized bed reactor for CO{sub 2} capture. The decomposition conversion of limestone increased as the steam dilution percentage in the CO{sub 2} supply gas increased. At a bed temperature of 1193 K, the conversions were 72% without dilution (100% CO{sub 2}) and 98% with 60% steam dilution. The decomposition conversions obtained with steam dilution and N{sub 2} dilution differed significantly, and this result is explained in terms of the difference between the heat transfer to particle in steam and N{sub 2} dilution atmosphere. The reactivities of the CaO produced from limestone decomposition with steam dilution and without dilution (100% CO{sub 2}) were tested by means of hydration and carbonation reactions. In the hydration test, the time required for complete conversion (CaO{yields}Ca(OH){sub 2}) of the CaO produced by steam dilution was approximately half that required for the CaO produced without dilution. In the carbonation test, carbonation conversion (CaO{yields}CaCO{sub 3}) of the CaO produced by steam dilution was approximately 70%, whereas the conversion was approximately 40% for the CaO produced without dilution. 17 refs., 8 figs., 5 tabs.
- OSTI ID:
- 21084943
- Journal Information:
- Energy and Fuels, Vol. 22, Issue 4; Other Information: wang-yin@aist.go.jp; ISSN 0887-0624
- Country of Publication:
- United States
- Language:
- English
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