A study of the CO2 capture pilot plant by amine absorption

A pilot plant for CO2 recovery of 2 ton-CO2/day from flue gas emitted from a 500 MW coal fired power plant was tested with aqueous amine absorbents. Based on a chemical absorption/regeneration process with 30 wt% aqueous monoethanolamine (MEA) solution, we studied the CO2 recovery as a function of flow rate and input location of absorbent, pressure and temperature of stripper, and temperature of flue gas. Experimental data include the temperature profile of the absorber/stripper and CO2 lean/rich loading values, which remained stable during the operation. We evaluated the energy requirement for regeneration of aqueous amine and the degree of CO2 removal. While regeneration energy of aqueous amine increased with an increase in flue gas temperature and stripper pressure, it decreased with an increase in injection height of absorbent. The optimum point in flow rate of absorbent was 1300 kg/h in 350 Sm3/h flue gas. The regeneration energy using 30 wt% MEA solution was 3.92 GJ/ton CO2 in 90% CO2 removal, flue gas temperature of 40 °C, stripper pressure of 0.5 kgf/cm2 and L/G ratio of 3.7 kg/Sm3. In addition, corrosion rate of the pilot plant were measured in six points. It is the largest as 79.11 mpy in the bottom of the stripper tower.

[1]  G. Versteeg,et al.  Kinetics of the reaction of CO2 with the sterically hindered amine 2-Amino-2-methylpropanol at 298 K , 1990 .

[2]  Sanjeev Maken,et al.  A study on the carbon dioxide recovery from 2 ton-CO2/day pilot plant at LNG based power plant , 2008 .

[3]  S. Bandyopadhyay,et al.  Simultaneous absorption of carbon dioxide and hydrogen sulfide into aqueous blends of 2-amino-2-methyl-1-propanol and diethanolamine , 2005 .

[4]  Amornvadee Veawab,et al.  Corrosion in CO2 capture unit using MEA-piperazine blends , 2009 .

[5]  O. C. Sandall,et al.  Kinetics and modelling of carbon dioxide absorption into aqueous solutions of N-methyldiethanolamine , 1995 .

[6]  Gary T. Rochelle,et al.  Physical and chemical solubility of carbon dioxide in aqueous methyldiethanolamine , 2000 .

[7]  Hallvard F. Svendsen,et al.  Solubility of Carbon Dioxide in 30 mass % Monoethanolamine and 50 mass % Methyldiethanolamine Solutions , 2005 .

[8]  R. Kerr.  No Doubt About It, the World Is Warming , 2006, Science.

[9]  A. Dallos,et al.  Enthalpies of Absorption and Solubility of Carbon Dioxide in Aqueous Polyamine Solutions , 2001 .

[10]  S. Bandyopadhyay,et al.  Absorption of carbon dioxide into aqueous blends of 2-amino-2-methyl-1-propanol and monoethanolamine , 2006 .

[11]  G. Dickens.  Global change: Hydrocarbon-driven warming , 2004, Nature.

[12]  Gianni Astarita,et al.  CO2 absorption in aqueous solutions of hindered amines , 1986 .

[13]  S. Bandyopadhyay,et al.  Absorption of carbon dioxide into aqueous blends of 2-amino-2-methyl-1-propanol and diethanolamine , 2003 .

[14]  K. Arai,et al.  Phase equilibrium study for the separation and fractionation of fatty oil components using supercritical carbon dioxide , 1992 .

[15]  Rong Wang,et al.  Modeling of CO2 capture by three typical amine solutions in hollow fiber membrane contactors , 2004 .