NOVELTY - The device comprises an air separation unit, a gasification unit, a heat recovery unit, and a sulfur removal unit, which is connected to a separator for degassing sulfur compounds. The separator is prepared for an extension by an upper wash unit for carbon dioxide (CO2) removal and for an additional connection to hydrogen sulfide (H2S) enrichment unit to be added. The sulfur removal unit is prepared for an additional connection to CO2 absorption column to insert between the sulfur removal unit and separator, and is arranged as an absorption column for physical acid gas removal process.    USE - The device is useful for converting solid or liquid fuels into a gaseous fuel containing hydrogen and carbon monoxide, and in integrated gasification combined cycle plants for clean power generation.    ADVANTAGE - The device is capable of efficiently and economically converting solid or liquid fuels into a gaseous fuel, and can be operated for a long time thus capable of generating power at high efficiency.    DETAILED DESCRIPTION - The device comprises an air separation unit, a gasification unit, a heat recovery unit, and a sulfur removal unit, which is connected to a separator for degassing sulfur compounds. The separator is prepared for an extension by an upper wash unit for carbon dioxide (CO2) removal and for an additional connection to hydrogen sulfide (H2S) enrichment unit to be added. The sulfur removal unit is prepared for an additional connection to CO2 absorption column to insert between the sulfur removal unit and separator, and is arranged as an absorption column for physical acid gas removal process using an organic solvent. The upper wash unit is arranged as an absorption column for a physical acid gas removal process using an organic solvent to be added to the separator. The CO2 absorption column is arranged as an absorption column for a physical acid gas removal process using an organic solvent to be inserted between the sulfur removal unit and the separator.    DESCRIPTION OF DRAWING(S) - The figure shows Rectisol (RTM: Acid gas removal process) unit in which CO2 and/or sulfur components is absorbed by methanol and removed from a carbon monoxide and/or hydrogen containing feed gas.    Dilution media (3)    Hydrogen rich fuel gas (4)    Gas stream (10)    Feed gas (11)    Gas phase (13)    Liquid phase. (19)