| 초록 |
Synthetic Natural Gas(SNG) is most promising synthetic energy resources that can substitute natural gas which is used by energy sources or feedstock for synthesis of chemicals. There is more than 7 X 1010 m3 coke-oven gas(COG) made by coke-oven process in coke plant as by-product worldwide annually. COG contains CO2, CO which can influence to earth as green house gas. So emission and usage by combustion of COG cause environment problems. On the other hand, COG is also H2-rich gas which is high potential energy source for generation, synthesis and so on. In spite of high potential, much of COG is not used properly. This study proposes a new co-feed process by assisting SNG process with COG. COG is used by separation to H2 and rich-CH4 gas. H2 from COG can adjust the H/C ratio for synthesis of CH4, which can reduce or remove water gas shift reaction. Rich-CH4 gas is used to generate power by turbine, and partial CO2 from flue gas is used to methanation process. These features of process give high the efficiency of carbon utilization, while the energy analysis shows the efficiency of co-feed process increases about 10%, moreover, co-feed process is more economic than conventional SNG process by economic analysis. |
