F - Mech Eng,Light,Heat,Weapons – 22 – B
Patent
F - Mech Eng,Light,Heat,Weapons
22
B
110/15, 122/37
F22B 1/02 (2006.01) F22B 31/00 (2006.01) F23C 10/02 (2006.01)
Patent
CA 1332685
ABSTRACT OF THE DISCLOSURE The present invention discloses an interior circulation fluidized bed boiler in which a fluidized bed portion of a fluidized bed boiler is divided by a partition into a main combustion chamber and a heat recovering chamber, the main combustion chamber being provided at the lower portion thereof with at least two air chambers, i.e., an air chamber for imparting a high fluidizing speed to a fluidiz- ing medium and an air chamber for imparting a low fluidizing speed thereto, a whirling and circulating flow is formed in the fluidizing medium in the main combustion chamber by a combination of air having different fluidizing speeds jetted out of these air chambers, a circulating flow of the fluidizing medium is formed between the main chamber and the heat recovering chamber, and the fluidizing medium is moved downward in the form of a moving layer in the heat recovering chamber, characterized in that heat recover- ing of exhaust gas is effected in a free board portion or downstream of the free board portion, a temperature of the exhaust gas is lowered and thereafter the thus cooled exhaust gas is guided to a cyclone, and fine parti- culate chars collected by the cyclone are returned to a portion directly above a descending moving layer of the fluidizing medium in the main combustion chamber and or the heat recovering chamber or into the descending moving layer. By returning the chars to the portion directly above the descending moving layer of the fluidizing medium or into the descending moving layer, the chars are not immediately scattered, and the chars even in the form of fine particles are sufficiently precipitated and scattered on the fluidized bed whereby NOx generated as the result of combustion of coals or the like in the bed can be reduced. - 36 -
610057
Miyoshi Norihisa
Nagato Shuichi
Ohshita Takahiro
Ebara Corporation
Kirby Eades Gale Baker
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