Coal burning method to reduce particulate and sulfur emissions
AssigneeAluminum Company of America
InventorMelvin H. Brown
Life of this patent
Estimating the term…
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, a reagent adapted to react during combustion with the sulfur in the material and a cementing agent adapted to reduce particulate emissions during combustion. 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.
Claims15
A method for burning a pulverized carbonaceous material containing sulfur and ash, comprising forming a slurry containing the carbonaceous material, water, a reagent adapted to react with the sulfur and a cementing agent, 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 45% and 65% by weight of the carbonaceous material, between 30% and 45% by weight water and between 5% and 15% by weight calcium oxide, allowing the slurry to harden by reaction of the water with the calcium oxide, burning the slurry in a first stage with less than 100% theoretical air, removing the products of combustion from the first stage to a second stage, and burning the products in the second stage with additional air.
Dependencies are inferred from the claim text.