Abstract
Gasification characteristics are presented for three high-ash Indian coals from the Godavari and Wardha valleys (Godavari Khani-Ramagundam, Manuguru-Kothagudem and Hindusthan-Lalpeth), as obtained in a moving bed pressure gasification pilot plant with a throughput of 1 t coal/h with oxygen and steam and air and steam mixtures as the gasifying media. Gasification was carried out at pressures of 1, 1.5, 2 and 2.4 MPa with a steam-oxygen molar ratio of 7 and carbon-oxygen molar ratio of 4. Material and energy balances, elemental balances for carbon, hydrogen and oxygen, specific consumption and throughputs, cold gas efficiency, carbon conversion and steam decomposition are presented. The gas obtained when using oxygen and steam contained about 40–42% hydrogen, 9–12% methane and 16–19% carbon monoxide with a higher heating value of 11–12 MJ/m n 3. Gas yield was in the range of 1.4 to 1.7 m n 3/kg coal.
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