Furnaces – Process – Burning pulverized fuel
Patent
1993-03-08
1994-03-08
Favors, Edward G.
Furnaces
Process
Burning pulverized fuel
110345, F23D 100
Patent
active
052918416
ABSTRACT:
A method of multi-stage combustion of sulfur and nitrogen-bearing coal which provides high combustion efficiency while preventing formation of sulfur- and nitrogen-bearing air pollutants. In the first stage, a major fraction of the hydrocarbons is burned out of the fuel [stage (1a)] at high temperature and the sulfur bound in the coal is freed therefrom and is then captured by reaction with a solid basic compound such as limestone [stage (1b)] at relatively low temperature. In stage 2 the remaining hydrocarbons in the fuel are burned out, and the residual mixture of coal ash and calcium-sulfur compounds is melted, encapsulating the sulfur in the molten slag, and a major portion of the molten compounds is removed from the gas stream. In stage 3, oxidation of CO and H.sub.2 is almost entirely completed and combustion gases are substantially cooled by heat transfer to the working medium. In stage 4, combustion is finally completed in excess air. The entire combustion process is carried out under conditions to prevent formation of oxides of sulfur and nitrogen. In a preferred embodiment oxygen-rich air for combustion is introduced in stages 1a, 2 and 4, and nitrogen-rich air is introduced in stages 1b and 3.
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Favors Edward G.
Geldin Max
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