Application Of Typical CO₂ Separation Method In IGCC System

The CO₂ emission is already become a global problem. The main source of CO₂ emission is come from coal-based poweer plants,so, Researching the reduction of CO₂ emission is a best way to control CO₂ emission. IGCC is a new and high effcient power generation technology of clean coal,and considered to be the most prospect power generation technology. Finding a proper CO₂ seperation technology is significant and also the main purpose of this article.In this paper, we estabish two CO₂ seperation processes. one is physical absorption of CO₂ with the solvent of Selexol, the other is chemical absorption of CO₂ with the solvent of MEA. In the method of selexol absorption, we analyzed effect to the CO₂ seperation by the amount of selexol the presser of stripper and different composition of synthesis. In the method of MEA absorption, we analyed the effect to theCO₂ seperation by the MEA concentration, CO₂ loading, the pressure and temperature of absorber, CO₂ separation ratio. by the analysis, we can get the resprctive operating parameters and the following conclusion:(1) In the case of the low concentration of H₂S, the best method is separation of CO₂ and H₂S at the same time with lowest energy consumption. In the case of the high concentration of H₂S, we can consider to separate CO₂ and H₂S at a separate process, and the energy consumption is low but more than the first case.(2) The energy consumption of MEA(116.28MW) is more than the energy consumption of Selexol(10.985MW). The method of Selexol is a more appropriate method than the method of MEA.(3) In the IGCC plant with selexol absorption method, the net power from 200MW down to 175.63MW, the efficency of IGCC system get down by 4.58%.