Particle circulation quantity control device of a circulating fluidized bed reactor

An object of the present invention is to increase the gasification efficiency in the arbitrarily adjusted to fluidized bed gasification furnace circulation amount of particles without changing the flow rate of the gasifying agent. The fluidized bed gasification furnace 107, a first chamber 113 which communicates with the interior of the fluid layer 105 formed in the second chamber 114, to introduce the hot particles 102 separated in the separator 104 into a first chamber 113 and the raw material M the particles 102 is introduced into the second chamber 114 through the internal flow layer 105 from the first chamber 113 so as to supply to the fluidized bed combustion furnace 100 by overflow, so that the pressure in the first chamber 113 is maintained at the set pressure 120 a first pressure controller 121 which controls the product gas induction means 116, a second pressure control pressure and the difference between the pressure in the second chamber 114 of the first chamber 113 to control the exhaust gas induction means 118 so that the set differential pressure 123 It comprises a vessel 124, to control the circulation amount of particles 102 by adjusting the bed height of the fluidized bed 105 in the first chamber 113.