Combustion of fuel containing alkalines

Details Combustion of fuel containing alkalines Combustion of fuel containing alkalines

1987-06-24

1988-09-20

Warner, Steven E.

Furnaces

Process

Burning pulverized fuel

110245, 110263, 110343, 122 4D, F23D 100

Patent

active

047717122

ABSTRACT:
A method of burning solid fuel having low melting point alkaline compositions, such as alkali metal salts, particularly lignite and salty brown coal. The fuel is introduced into the reaction chamber of a circulating fluidized bed reactor, and is mixed prior to introduction to the reaction chamber with a reactant material capable of reacting with the low melting point alkaline compositions of the fuel to produce high melting point alkali metal compounds during combustion. The temperature in the reaction chamber is kept below the melting point of the formed alkali metal compounds. The reactant material comprises silica oxide or a metal oxide, or hydroxide, of the group consisting of aluminum, calcium, magnesium, iron, titanium, and mixtures of two or more thereof. Kaolin is particularly effective, especially when the molar ratio of Al/(Na and K) is at least 1.0.

REFERENCES:
patent: 3625164 (1971-12-01), Spechor
patent: 3807090 (1974-04-01), Moss
patent: 3907674 (1975-09-01), Roberts et al.
patent: 4191115 (1980-03-01), Yang et al.
patent: 4262610 (1981-04-01), Hein et al.
patent: 4312919 (1982-01-01), Devenney
patent: 4450777 (1984-05-01), Wolhrum et al.
patent: 4579070 (1986-04-01), Lin et al.
A. Ahlstrom Corporation brochure "Pyroflow", Nov., 1984.
A. Ahlstrom Corporation brochure "Pyroflow A Multifuel Combustor", Mar., 1982.
Wall et al., "How to Burn Salty Sludges", Chemical Engineering, Apr. 14, 1975, pp. 77-82.

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