Study of limestone calcination with CO{sub 2} capture: decomposition behavior in a CO{sub 2} atmosphere
- National Institute of Advanced Industrial Science and Technology, Ibaraki (Japan)
In the present work, the effects of temperature (up to 1293 K) and residence time on the decomposition behaviors of limestone particles (0.25-0.5 mm) in a CO{sub 2} atmosphere were investigated using a continuously operating fluidized bed reactor for CO{sub 2} capture. The results show that the rate of limestone decomposition was strongly dependent upon the pressure difference between the equilibrium CO{sub 2} pressure and CO{sub 2} partial pressure in experiments (P{asterisk} - P{sub CO{sub 2}}) with temperature. Decomposition conversions (CaCO{sub 3} {yields} CaO) were 73% at 1193 K and 95% at 1293 K, with a 70 min average residence time of particles in the bed. A model was proposed to describe the distribution of limestone particles in the fluidized bed reactor with residence time. The hydration and carbonation reactivities of CaO produced by the limestone decomposition were also tested. The results show that CaO hydration (CaO to Ca(OH){sub 2}) can be completed within 11 min; however, the conversion of CaO to CaCO{sub 3} in the CaO carbonation test was below 60%. 16 refs., 10 figs., 3 tabs.
- OSTI ID:
- 20978282
- Journal Information:
- Energy and Fuels, Vol. 21, Issue 6; Other Information: wang-yin@aist.go.jp; ISSN 0887-0624
- Country of Publication:
- United States
- Language:
- English
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