Patent ID: 8444723
Filing Date: 2013-05-21
Classification: C10J

Abstract:
1. A fluidized bed gasification method wherein a fluidized bed combustion furnace is provided for combustion of char so as to heat solid particles, the solid particles being separated from hot fluid derived from the fluidized bed combustion furnace, the separated solid particles being introduced into a fluidized bed gasification furnace, raw material being introduced into said fluidized bed gasification furnace, the raw material being gasified by a fluidized bed supplied with a gasification agent in said fluidized bed gasification furnace to take out produced gas, char produced upon the gasification of the raw material and the solid particles being circulated to said fluidized bed combustion furnace for combustion of the char, said fluidized bed gasification method comprising varying a circulated amount of the solid particles in said fluidized bed combustion furnace in a range of kg/kg ratio between 6 and 30 to an air flow rate, wherein the circulated amount of the solid particles is varied using a particle takeoff device and a particle supplying device connected to a lower portion of the fluidized bed combustion furnace.