Internal circulating fluidized bed type boiler and method of...

F - Mech Eng,Light,Heat,Weapons – 27 – B

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F27B 15/00 (2006.01) B09B 3/00 (2006.01) F22B 35/00 (2006.01)

Patent

CA 1316413

ABSTRACT OF THE DISCLOSURE An internal recycling type fluidized bed boiler which comprises: a primary fluidized bed incinerating chamber constructed by an air diffusion plate, and an inclined partition wall provided above the portion of the diffusion plate where the mass flow of the air injected from the diffusion plate is greater than that from the other portion so as to interfere with the upward flow of the fluidizing air injected from that portion and deflect it towards the portion above the diffusion plate where the mass flow of gas injected is smaller; and a thermal energy recovery chamber formed between the inclined partition wall and the side wall of an incinerator; the inclined partition wall being inclined by 10- 60° relative to the horizon and arranged such that the length of its projection in the horizontal direction is 1/6-1/2 of the horizontal length of the incinerator bottom, and a method of controlling the above fluidized bed boiler with respect to the amount of thermal energy recovered from the thermal energy recovery chamber by regulating the amount of air injected from the diffuser in the thermal energy recovery chamber based on demands from the user side utilizing the recovered thermal energy, the fuel feeding amount to the primary fluidized bed incinerating chamber being controlled based on the temperature in the primary fluidized bed incinerating chamber.

570806

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