Process and installation for recycling solid unburnt materials i

Details Process and installation for recycling solid unburnt materials i Process and installation for recycling solid unburnt materials i

1983-12-01

1985-11-12

Makay, Albert J.

Furnaces

Process

Burning pulverized fuel

110101CA, 110103, 110186, 110263, 122 4D, F23D 100

Patent

active

045520780

ABSTRACT:
Process and apparatus for supplying combustible material to a fluidized bed in a vessel connected to a separating device for the solid particles entrained with the smoke and containing a certain proportion of unburnt matter, the particles recovered being recycled into the fluidized bed. During a normal operation of the fluidized bed supplied with combustible matter, the solid particles recovered in the separating device are accumulated in a silo and periodically, the supply of combustible matter is stopped and the particles accumulated in the silo are recycled into the fluidized bed with a regulated flow rate, so that the combustion of the unburnt matter contained in the recycled particles maintains the temperature of the fluidized bed at the desired level. The exothermic reaction is maintained alternately by the combustion of the combustible matter in the normal operating phase and by the combustion of the unburnt matter in the recycling phase. The invention is specially useful in boilers supplied with powdered coal.

REFERENCES:
patent: 3902462 (1975-09-01), Bryers
patent: 4084545 (1978-04-01), Nack et al.
patent: 4103646 (1978-08-01), Yerushalmi et al.
patent: 4312301 (1982-01-01), Anson
patent: 4338074 (1982-07-01), Johansson

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