Method of conditioning exhaust gases from coal firing
AssigneeF. L. Smidth & Co.
InventorHelge H. Petersen
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Abstract
The present invention relates to operation of a rotary kiln plant utilizing electrostatic precipitators. Specifically, this invention is directed to a method for conditioning exhaust gases from a burning process in a rotary kiln in which mineral materials are treated by burning a fuel. The method comprises adding a water soluble alkali-metal compound to a solid fuel, at least part of which is a solid pulverized fuel, and then firing the fuel in the kiln plant, whereby the resistivity of the exhaust gases is less than about 10.sup.10 ohm cm.
Claims10
A method of conditioning exhaust gases, containing substantial amounts of dust and lesser amounts of fly ash, from burning processes in a kiln plant, with an electrostatic precipitator, for the treatment of mineral materials which produce the substantial amounts of dust during treatment comprising:
- (a) taking a solid fuel;
- (b) adding to said fuel at least one alkali-metal compound;
- (c) grinding said solid fuel and alkali-metal compound such that at least a portion of the fuel assumes a solid pulverized condition;
- (d) feeding into a rotary kiln mineral materials which, upon burning, produce substantial amounts of dust;
- (e) introducing said fuel into the rotary kiln in its ground condition;
- (f) firing the treated, solid ground fuel in the kiln to burn the mineral materials thereby producing a mineral product and exhaust gases containing the substantial amounts of dust and lesser amounts of fly ash which now contain alkali-metal to reduce resistance;
- (g) separating the exhaust gases and the alkali-metal and dust and fly ash by precipitation in the electrostatic precipitator;
- and
- (h) recovering the conditioned exhaust gases.
A method of conditioning exhaust gases, containing substantial amounts of dust and lesser amounts of fly ash, from burning processes in a kiln plant, with an electrostatic precipitator, for the treatment of mineral materials which produce the substantial amounts of dust during treatment comprising:
- (a) taking a solid fuel;
- (b) grinding said solid fuel such that at least a portion of the fuel assumes a solid pulverized condition;
- (c) adding to said solid ground fuel at least one alkali-metal compound;
- (d) feeding into a rotary kiln mineral materials which, upon burning, produce substantial amounts of dust;
- (e) introducing said fuel into the rotary kiln in its ground condition;
- (f) firing the treated, solid ground fuel in the kiln to burn the mineral materials thereby producing a mineral product and exhaust gases containing the substantial amounts of dust and lesser amounts of fly ash which now contain alkali-metal to reduce resistance;
- (g) separating the exhaust gases and the alkali-metal and dust and fly ash by precipitation in the electrostatic precipitator;
- and
- (h) recovering the conditioned exhaust gases.
Dependencies are inferred from the claim text.