Experimental Study on Factors for the Capability of Ca-Based Absorbent for CO₂-Capture

Abstract:

In order to find the factors and their effects for the Ca-based absorbent for CO₂-capture, the experimental method was used to research the limestone in the calcination/carbonation fixed bed process. Then measured the specific surface and specific pore volume respectively by the method of COULTER_SA_3100 nitrogen absorption specific surface and the method of BET and BJH through pore size analyzer. The result has showed that the microstructure of absorber and conversion ratio of carbonation X was affected by the operating parameters including calcination temperature (Tcal), CO₂ concentration in calcination atmosphere, variable cyclic number N and carbonation temperature (Tcar). In this experiment, X reached its maximum when Tcal was 850°C, with the calcination temperature continued to rise, X reduced gradually. The increase of the concentration of CO₂ will strengthen the role of sintering and reduce X in the calcination atmosphere. With the increase of the cyclic number N, sintering effect made the micro-structure of absorbent change, so that X decreased. Tcar close to the limit temperature was appropriate. In the limited temperature range, with the increase of N, conversion ratio of carbonation X declined slowly.

• Periodical: Advanced Materials Research (Volumes 356-360)
• Pages: 1546-1550
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.356-360.1546
• Online since: October 2011
• Authors: Hong Wei Chen, Ri Guang Wei, Jian Mei, Jian Qiang Gao, Chun Bo Wang
• Keywords: Ca-Based Absorbent, Calcination, Carbonation, CO₂-capture

References

[1] Y.J Li, C.S Zhao: Experimental Study Based on Calcium-based Absorbent Cyclic Reaction (CCR) for CO2-Capture. Journal of Power Engineering Vol. 28 (2008), pp.117-121.

[2] B.R. Stanmore, P. Gilot. Review—Calcination and Carbonation of Limestone During Thermal Cycling for CO2 Sequestration. Fuel Processing Technology Vol. 86 (2005), pp.1707-1743.

DOI: 10.1016/j.fuproc.2005.01.023

[3] Abanades J C, Anthony E J, Alvarez D, et al. Capture of CO2 from Combustion Gases in a Fluidized Bed of CaO. AICHE J Vol. 50 (2004), pp.1614-1622

DOI: 10.1002/aic.10132

[4] Grasa G S, Abanades J C. CO2 Capture Capacity of CaO in Long Series of Carbonation/Calcination Cycles. Industrial&Engineering Chemistry Research Vol. 45 (2006), pp.8846-8851

DOI: 10.1021/ie0606946

[5] Y.J Li, C.S Zhao. Carbonation Characteristics in Calcium-sorbents Cyclic Calcination/Carbonation Reaction Process. Journal of Power Engineering Vol. 28 (2008), pp.55-60

[6] Barker R. The Reactivity of Calcium Oxide Towards Carbon Dioxide and Its Use for Energy Storage. J.Appl.Chem. Biotechnol Vol. 24 (1974), pp.221-227

DOI: 10.1002/jctb.5020240405