| 초록 |
The off-gases generated from the iron and steel industry, namely BFG, COG, LDG, and FOG, contain large amount of chemical as an energy source such as CH4 and H2. Therefore energy-efficiently upgrading such off-gases into the value-added products is one of critical issues on the implementation of the carbon capture, use and storage (CCUS) strategy. However, the gases include not only energy sources but considerable carbon dioxide along with impurities (e.g., N2, Nox, Sox, CmHn, and low-quality steam). In this study, we analyze various gas separation systems to capture the useful carbons from the off-gas stream, such as PSA, membrane, MEA technologies, and extend the separation systems to a utilization strategy by include upgrading technologies (e.g., SMR, methanol synthesis). We then evaluate the net energy efficiency of the utilization strategies, and compare to the energy performance against any Business-As-Usual systems, such as direct combustion of off-gas for the power generation. We also identify major parameters to the energy efficiency of the system and their sensitivity to the economics of the utilization strategies. |
