Patent ID: 8734549

Claim:
A method for gasifying solid fuel with unified gas purification, comprising: feeding solid fuel and a gasifying agent to a first reactor for pyrolysis and gasification where said solid fuel is pyrolyzed in contact with a heat medium to generate char which is gasified by said gasifying agent, CO 2 in gasified gas generated by said pyrolysis and gasification being absorbed by an active chemical at a reaction temperature of 773-1073K; feeding residual char which is not gasified in said first reactor for pyrolysis and gasification, the heat medium which is lowered in temperature by the pyrolysis and gasification of said solid fuel, the active chemical which is less-activated through the reaction with said CO 2 and newly added inactive chemical to a second reactor for char combustion where said char is burned by an oxidizing agent to bring about combustion heat of 1073K or more, said low-active and inactive chemicals are calcined to be re-activated and activated, respectively; and feeding the heat medium in said second reactor for char combustion heated to 1073K or more, the re-activated and activated chemicals and said gasified gas from said first reactor for pyrolysis and gasification to a third reactor for gasified gas purification where said chemicals function as catalyst to reform tar in said gasified gas at a reaction temperature which is lower than a reaction temperature in said second reactor for char combustion and higher than a reaction temperature of the first reactor for pyrolysis and absorbs H 2 S and HCl in said gasified gas to purify said gasified gas, the chemicals functioning as catalyst to purify said gasified gas circulated together with the heat medium to said first reactor for pyrolysis and gasification, wherein said first reactor and said third reactor are vertically connected into an integral unit, and said active chemical and said heat medium pass through a particle passage arranged in said first reactor and said third reactor into said first reactor.