| 초록 |
As iron & steel industry is one of the major CO2 emission sectors, it is necessary to apply carbon capture and storage (CCS) to mitigate CO2 emission to slow down global warming. Amine-based chemical absorption technology is one of the attractive options for CO2 capture due to its technical maturity, high CO2 selectivity, and extra-high CO2 purity (＞99 mol.%). However, high reboiler duty is one of the major drawbacks, which leads to high operating cost. To overcome such obstacle, hybridization of amine-based chemical absorption and membrane technology has been suggested recently. This idea intends to improve the performance of chemical absorption by raising CO2 concentration of feed gas and CO2/amine loading while producing high purity CO2 for storage. This work focuses on the application of such hybrid system to blast furnace gas (BFG). The entire hybrid system is composed of three units connected in a series: (1) a membrane for H2 pre-separation, (2) 8m piperazine-based scrubber for CO2 capture, and (3) another membrane for CO2 post-separation. Process design and simulation is carried out to evaluate how much reboiler duty and operating cost are reduced. |
