고갈 석탄층가스 저류층을 지오필터로 활용한 청정수소 생산 시뮬레이션 연구

초록

Energy transition is progress fossil fuel into clean hydrogen for Net-zero. Clean hydrogen refers to hydrogen where CO2 emissions during production are 4 kg or less per 1 kg of H2 produced. In this study, a separation system for H2 and CO2 in grey hydrogen is designed using depleted coal seam gas reservoir to produce clean hydrogen. Geofilter produces clean hydrogen using coal's adsorption proper- ties to remove CO2 from grey hydrogen and recover clean hydrogen. A reservoir simulation was con- structed using CH4 depleted coal seam reservoir models H2 recovered 4 months after grey hydrogen in- jection, while CO2 production started 7 years later. As grey hydrogen injection volume increased, the mass ratio of CO2 to H2 increased more rapidly. At the clean hydrogen production period when the mass ratio over 4, H2 recovery reached 90% over, and CO2 storage efficiency was 70%. Additionally, as the injection rate in- creased, H2 recovery decreased, and CO2 storage efficiency was influenced by the contact efficiency between CO2 and coal. The sensitivity analysis of coal properties confirmed CO2 adsorption capacity gas has the largest CO2 and coal. The sensitivity analysis of coal properties confirmed CO2 adsorption capacity gas has the largest impact on geofilter performance. Therefore, injecting grey hydrogen into coal seam gas reservoirs to utilize the geofilter is expected to enable the production of clean hydrogen.

키워드