Non-polluting method of burning fuel for heat and CO.sub.2

Details Non-polluting method of burning fuel for heat and CO.sub.2 Non-polluting method of burning fuel for heat and CO.sub.2

1987-01-06

1988-04-19

Favors, Edward G.

Furnaces

Process

Burning pulverized fuel

48 76, 110229, 110345, 423437, F23D 100

Patent

active

047382074

ABSTRACT:
A non-polluting method of, and apparatus for, burning fuel to produce heat and a CO.sub.2 -rich hot flue gas stream is described. Fuel (e.g., coal, oil, gas, wood, inter alia) is passed into a gasifier bed (12) containing particles of calcium sulfate and, optionally, calcium oxide. Bed 12 is fluidized by product gas containing an oxygen-transfer mediator (or source thereof) such as hydrogen, and fuel is partially oxidized to gas-phase products including CO and CO.sub.2 at a temperature above the carbonation temperature of calcium oxide, calcium sulfate being reduced to calcium sulfide. The gas-phase products are passed into the base of a combustion bed (28) containing particles of calcium sulfate in the presence of an oxygen-transfer mediator and CO is oxidized to CO.sub.2 at a temperature above the carbonation temperature of calcium oxide. Calcium sulfide-containing particles from the gasifier and combustion beds (12 and 28) are fluidized by an oxidizing gas (e.g. air) in respective oxidation beds (42,45) and CaS is exothermically oxidized to CaSO.sub.4 for re-use. Preferably the particles circulate from the gasifier bed (12) to a first oxidation bed (42), then to the combustion bed (28), a second oxidation bed (45) and back to the gasifier bed (12) via underflow weirs connecting the beds. The gas from each bed is at the temperature of the respective bed (e.g. 850.degree. to 1000.degree. C.) and is used for steam raising, preheating air, etc.

REFERENCES:
patent: 3912465 (1975-10-01), Kunii et al.
patent: 4490157 (1984-12-01), Fernandes
patent: 4597771 (1986-07-01), Cheng
patent: 4627367 (1986-12-01), Butt

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