Method for drying coal with hot recycle material

Details Method for drying coal with hot recycle material Method for drying coal with hot recycle material

1986-04-04

1987-09-01

Yuen, Henry C.

Furnaces

Process

Burning pulverized fuel

110106, 110238, 110245, 110263, F22B 100

Patent

active

046900764

ABSTRACT:
A method of feeding particulate material (17) to a fluidized bed furnace (10) is provided wherein particulate coal, particulate limestone and particulate material withdrawn from the furnace system are fed to the furnace as a mixture in a unified feed system. Raw coal and limestone are independently crushed to the desired size and premixed to yield a desired calcium to sulfur mole ratio. The premized coal and limestone (7) are passed to a dryer/mixer and contacted therein with hot particulate material (9,19) withdrawn from the fluidized bed furnace system for a period of time sufficient to substantially dry the wet coal and hydrate at least a portion of the lime contained in the hot particulate material. The so-conditioned mixture (15) is then entrained in a conveying gas and fed to the fluidized bed (12) in a conventional manner.

REFERENCES:
patent: 4059060 (1977-11-01), Gambs et al.
patent: 4232614 (1980-11-01), Fitch et al.
patent: 4259911 (1981-04-01), Jones
patent: 4343246 (1982-08-01), Jukkola et al.
patent: 4397248 (1983-08-01), Mehta et al.
patent: 4411879 (1983-10-01), Ehrlich et al.
patent: 4421036 (1983-12-01), Brannstrom et al.
patent: 4424766 (1984-01-01), Boyle
patent: 4434726 (1984-03-01), Jones
patent: 4446799 (1984-05-01), Andersen
patent: 4640205 (1987-02-01), Brannstrom

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