Furnaces – Process – Burning pulverized fuel
Patent
1989-11-28
1991-01-01
Yuen, Henry C.
Furnaces
Process
Burning pulverized fuel
110106, 110245, F23D 100
Patent
active
049811118
ABSTRACT:
A circulating fluidized bed combustion reactor and a process for combusting a solid hydrocarbon fuel in the same wherein fly ash recycling is utilized to regulate heat transfer and to minimize erosion of reactor operating components. The process comprises introducing a solid hydrocarbon fuel and an oxygen-containing gas into a combustion zone which is surrounded by a plurality of adjoining cooling tubes containing a circulating fluid; combusting the fuel in the presence of the oxygen-containing gas within a predetermined temperature range thereby forming hot exhaust gases containing solid particles; discharging the hot exhaust gases containing the solid particles from the combustion zone and cooling the exhaust gases by indirect heat exchange against the cooling tubes; separating the resultant cooled solid particles into at least a first portion which is recycled into the combustion zone and a second portion having an average particle size smaller than the first portion; separating the second portion into a gas stream substantially free of particles and a concentrated stream of particles; recycling the concentrated stream of particles into the combustion zone at a rate sufficient to maintain the predetermined temperature range within the combustion zone and exhausting the gas stream which is substantially free of solid particles.
REFERENCES:
patent: 3951081 (1976-04-01), Martin et al.
patent: 4111158 (1978-09-01), Reh et al.
patent: 4259911 (1981-04-01), Jones
patent: 4532872 (1985-08-01), Anderson
patent: 4829912 (1989-05-01), Alliston et al.
Bennett Douglas L.
Studer David W.
Air Products and Chemicals Inc.
Gourley Keith D.
Marsh William F.
Simmons James C.
Yuen Henry C.
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