The cyclic sorption ability of two Greek limestones for CO2 and SO2 was investigated aided by thermogravimetric analysis. Effects of CO2 on the sulfation and of SO2 on carbonation were also determined by simultaneous sulfation and car-bonation.

The time required for the chemically controlled CO2 capture stage was unaffected by the number of carbonation/calcination cycles. On the other hand, the time needed to calcine the samples decreased with an increase in the number of cycles. Increasing the particle size resulted in a reduction in the CO2-sorption capacity of both limestones. Reducing the reaction temperatures caused a reduction in the capture capability of the limestones due to the reduced calcium utilization.

Florina limestone sulfated according to an unreacted core sulfation mode, whereas Megalopolis limestone followed a uniform sulfation mode. Periods of calcination during sulfation resulted in higher SO2 capture efficiencies than continuous sulfation of the limestone. Simultaneous carbonation/sulfation tests showed that each one of these processes is affected by the other. The CO2 capture capacity of the limestones was significantly reduced by the presence of SO2, whereas SO2 capture can be increased by slow carbonation, and sulfation remains unaffected by the presence of CO2 for longer time periods. Florina limestone presents increased tolerance to sulfation compared with Megalopolis limestone. Overall the Florina limestone is superior to the Megalopolis limestone.


Abanades, JC (2002) The maximum capture efficiency of CO2 using a carbonation/calcination cycle of CaO/CaCO3. Chem. Eng. J. 90: 303-306.

Abanades, JC, Alvarez, D (2003) Conversion limits in the reaction of CO2 with lime. Energy Fuels 17: 308-315.

Adanez, J, Garcia-Labiano, F (1993) Factors affecting the thermogravimetric technique in the characterization of sorbents for AFBC. Thermochimica Acta 217: 99-113, Badin, EJ, Frazier, GC (1985) Sorbents for fluidized-bed combustion. Environ. Sci. Tech-nol. 19 (10): 894-901.

Barker, R (1973) The reversibility of the reaction CaCO3 ^ CaO + CO2. J. Appl. Chem. Biotechnol. 23: 733-742.

Cheng, L, Chen, B, Liu, N, Luo, Z, Cen, K (2004) Effect of characteristic of sorbents on their sulfur capture capability at a fluidized bed condition. Fuel 83: 925-932. Chrissafis, K, Dagounaki, C, Paraskevopoulos, KM (2005) The effects of procedural variables on the maximum capture efficiency of CO2 using a carbonation/calcination cycle of carbonated rocks. Thermochimica Acta 428: 193-198.

Ghosh-Dastidar, A, Mahuli, SK, Agnihotri, R, Fan, LS (1996) Investigation of high-reactivity calcium carbonate sorbent for enhanced SO2 capture. Ind. Eng. Chem. Res. 35: 598-606. Grasa, GS, Abanades, JC (2006) CO2 capture capacity of CaO in long series of carbona-tion/calcination cycles. Ind. Eng. Chem. Res. 45: 8846-8851.

Haji-Sulaiman, MZ, Scaroni, AW (1990) The calcination and sulphation behavior of sorbents in fluidized bed combustion. Fuel 70: 169-176.

Laursen, K, Duo, W, Grace, JR, Lim, CJ (2001) Characterisation of steam reactivation mechanisms in limestones and spent calcium sorbents. Fuel 80: 1293-1306. Laursen, K, Duo, W, Grace, JR, Lim, J (2002) Sulfation and reactivation characteristics of nine limestones. Fuel 79: 153-163.

Li, Y, Buchi, S, Grace, JR, Lim, CJ (2005) SO2 removal and CO2 capture by limestone resulting from calcination/sulfation/carbonation cycles. Energy Fuels 19: 1927-1934. Mess, D, Sarofim, AF, Longwell, JP (1999) Product layer diffusion during the reaction of calcium oxide with carbon dioxide. Chem. Eng. J. 90: 999-1005.

Munoz-Guillena, MJ, Linares-Solano, A, Salinas-Martine de Lecea, C (1995) A new parameter to characterize limestones as SO2 sorbents. Applied Surface Science 89: 197-203. Ryu, HJ, Grace, JR, Lim, CJ (2006) Simultaneous CO2/SO2 characteristics of three limestones in a fluidized-bed reactor. Energy Fuels 20: 1621-1628.

Silaban, A, Harrison, DP (1995) High temperature capture of carbon dioxide: characteristics of the reversible reaction between CaO(s) and CO2(g). Chem. Eng. Commun. 137 (1): 177-190.

Silaban, A, Narcida, M, Harrison, DP (1996) Characteristics of the reversible reaction between CO2(g) and calcined dolomite. Chem. Eng. Commun. 146: 149-162. Skodras, G, Grammelis, P, Basinas, P, Kaldis, S, Sakellaropoulos, GP (2007) A kinetic study on the devolatilisation of animal derived byproducts. Fuel Process. Technol. 88: 787-794. Stanmore, BR, Gilot, P (2005) Review-calcination and carbonation of limestone during thermal cycling for CO2 sequestration. Fuel Process. Technol. 86: 1707-1743. Sun, P, Grace, JR, Lim, CJ, Anthony, EJ (2005) Simultaneous CO2 and SO2 capture at fluidized bed combustion temperatures. Proceedings of the 18th International Conference on Fluidized Bed Combustion, 22-25 May 2005, Toronto, Ontario, Canada. Sun, P, Grace, JR, Lim, CJ, Anthony, EJ (2007) Removal of CO2 by calcium-based sor-bents in the presence of SO2. Energy Fuels 21: 163-170.

Ye, Z, Wang, W, Zhong, Q, Bjerle, I (1995). High temperature desulfurisation using fine sorbent particles under boiler injection conditions. Fuel 74: 743-750.

Was this article helpful?

0 0
Solar Power

Solar Power

Start Saving On Your Electricity Bills Using The Power of the Sun And Other Natural Resources!

Get My Free Ebook

Post a comment