Development of hybrid system for pre-combustion CO₂ capture

As new technologies for energy increase in the world, integrated gasification combined cycle (IGCC) with carbon capture and storage has been developed as a means for maximizing energy efficiency and minimizing the effect of climate change. To make CO2 rich stream and separate hydrogen from reacted gas stream in gasification processes, a hybrid system composed of two step water gas shift reactor and Pd-Cu membrane reactor has been under development. As the partial pressure of hydrogen increased, the hydrogen flux generally increased. CO2 and CO concentration increased with increasing bed pressure because the permeation of H2 increased. When hydrogen permeate flux increased with increasing gas flow, the concentration of CO2 in retentate flow decreased from 84.75vol% to 78.20vol%. In order to maximize CO2 concentration in retentate flow and to use WGS with membrane reactor in pre-combustion CO2 capture, higher pressure and moderate gas flow in membrane reactors may be needed.