High Performance of the CFBC Pilot Plant with CO₂ Chemical Absorption by Optimizing the Absorber Parameters

Abstract:

The objective of this paper consists to identify the influence of absorption process temperature and pressure on the energy requirement of the CO₂ chemical capture process. The study aimed to reducing CO₂ emissions from coal combustion process in the circulating fluidized bed combustion (CFBC). The post-combustion CO₂ capture process was analyzed using primary amine MEA in the following conditions: the ratio L/G was varied between 0.45..1.6 kg_liquid/kg_gas keeping constant the flue gas flow and varying the solvent flow between 500 .. 1 600 kg/h. The CO₂ capture process efficiency was maintained constant around 90%. For a concentration of 30% MEA in solution, it was observed that when the absorber solution temperature increasing from 32 to 49 °C, the amount of heat required for the solvent regeneration increased from 2.1 to 3.3 GJ/tCO₂ according to the solvent pressure and flue gas pressure respectively. On the other hand, for varying the absorber solvent pressure in the range 1.1 .. 2.1 atm, the heat required by the process was not significantly influenced. Considering the same variation of the absorber solvent temperature, the rich loading solvent was increased from 0.43 to 0.57 mol CO₂/mol MEA and consequently the MEA capacity of CO₂ absorption from 0.3 to 0.422 molCO₂/mol MEA.

• Periodical: Advanced Materials Research (Volume 746)
• Pages: 3-8
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.746.3
• Online since: August 2013
• Authors: Cristian Dinca, Adrian Badea, Horia Necula
• Keywords: Absorber Unit, CFBC, Chemical Absorption, CO₂ Capture, MEA

References

[1] Abu-Zahra, M.R.M., Schneiders, L.H.J., Niederer, J.P.M., Feron, P.H.M., Versteeg, G.F., 2007. CO2 capture from power plants. Part I: a parametric study of the technical performance based on monoethanolamine. International Journal of Greenhouse gas control 1, 37–46.

DOI: 10.1016/s1750-5836(06)00007-7

[2] Rochelle, G., 2003. Innovative stripper configurations to reduce the energy cost of CO2 capture. In: Second Annual Carbon Sequestration Conference, Alexandria, 5–8 May, (2003).

[3] Kothandaraman, A., 2010. Carbon dioxide capture by chemical absorption: a solvent comparison study. Thesis, Massachusetts Institute of Technology, June 2010, 263 pp.

[4] Davis, J., 2009. Thermal degradation of aqueous amines used for carbon dioxide capture. Thesis, University of Texas at Austin, August 2009, 307 pp.

[5] Oyenekan, B.A., Rochelle, G.T., 2007. Alternative stripper configurations for CO2 capture by aqueous amines. AIChE Journal 53 (12), 3144–3154.

DOI: 10.1002/aic.11316

[6] Yongping Y., Rongrong Z., et al. Integration and evaluation of a power plant with a CaO-based CO2 capture system. International Journal of Greenhouse Gas Control, Vol. 4, 2010, 603-612 pp.

DOI: 10.1016/j.ijggc.2010.01.004

[7] Dinca, C., Badea A. The parameters optimization for a CFBC pilot plant experimental study of post-combustion CO2 capture by reactive absorption with MEA. Int. J. Greenhouse Gas Control, vol. 12, 2013, 269-279 pp.

DOI: 10.1016/j.ijggc.2012.11.006