Patent ID: 8257453

Claim:
A method for gasifying gasification fuel wherein exhaust gas from a combustion furnace is guided to and separated in a material separator from bed material, gasification fuel and the separated bed material being fed to a gasification furnace where the gasification fuel is gasified by a fluidized bed using steam to take out flammable gas, flammable solid content generated in the gasification furnace through gasification being fed together with the bed material into the combustion furnace to thereby burn the flammable solid content by air to heat the bed material, said method for gasifying gasification fuel comprising: feeding the gasification fuel and the bed material separated in said material separator to a first side in said gasification furnace; feeding the flammable solid content and the bed material in said gasification furnace to said combustion furnace through a solid content supply port provided at a second side of said gasification furnace; arranging partition plates in said gasification furnace between said first and second sides thereof to form a zigzag curved flow passage with upper and lower turns such that the flammable solid content and the bed material having passed through the zigzag curved flow passage form an upward flow toward the solid content supply port at the second side of the gasification furnace; and arranging a seal plate for gas sealing above the upward flow formed in the gasification furnace between the second side thereof and a partition plate to feed the flammable solid content and the bed material in the gasification furnace to the combustion furnace.