Coal burning method to reduce particulate and sulfur emissions
AssigneeAluminum Company of America
InventorMelvin H. Brown
Life of this patent
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Abstract
A method is disclosed for burning a pulverized carbonaceous material containing sulfur and ash. According to this method, a slurry is formed containing the carbonaceous material, water and a reagent adapted to react during combustion with the sulfur in the material. The slurry is burned in a first stage with less than 100% theoretical air and preferably at a temperature below about 1100.degree. C. The products of combustion from the first stage are removed to a second stage and burned with additional air.
Claims13
A method for burning a pulverized carbonaceous material containing sulfur and ash, comprising forming a slurry containing the carbonaceous material, water and a reagent adapted to react with the sulfur, burning the slurry in a first stage with less than 100% theoretical air, removing the combustible gases from the first stage to a second stage, and burning the gases in the second stage with additional air.
A method of burning a pulverized carbonaceous material containing sulfur and ash, comprising forming a slurry containing between 40% and 60% by weight of the carbonaceous material, between 35% and 55% by weight water and between 5% and 15% by weight calcium oxide, burning the slurry in a first stage with about 50% theoretical air, removing the products of combustion from the first stage to a second stage, and burning the products in the second stage with greater than 50% theoretical air.
Dependencies are inferred from the claim text.