Experimental simulations of methane-oriented underground coal gasification using hydrogen - The effect of coal rank and gasification pressure on the hydrogasification process

This paper presents a series of surface experimental simulations methane-oriented underground coal gasification using hydrogen as medium. The main aim the experiments conducted was to evaluate feasibility methane-rich gas production through in situ hydrogasification process. Two multi-day trials were carried out large scale facilities designed for ex (UCG) different coals investigated: “Six Feet” semi-anthracite (Wales) and “Weso?a" hard (Poland). samples extracted directly from respective seams form blocks. tests artificial (0.41 × 0.41 3.05 m) under two distinct pressure regimes - 20 40 bar. demonstrated that physicochemical properties (coal rank) considerably affect For both pressures applied, characterized by higher content methane. average CH4 concentration experiment during H2 stage 24.12% at bar 27.03% During coal, 19.28% 21.71% bar, respectively. process high stability reproducibility conditions favorable methane formation whole sequence cycles. Although initially demonstrated, further techno-economic studies are necessary assess economic this