Method and Apparatus for Incineration of Combustible Waste
AssigneeFLSmidth A/S
InventorSteven Miller
Life of this patent
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Abstract
A method and apparatus for incinerating different types of combustible waste in a cement manufacturing process. Two combustion chambers for incinerating waste are arranged in series, with first combustion chamber being a down draft chamber in which there is a downward flow of combustion gas and waste fuel to a waste and gas outlet. The second chamber is adaptable to support waste on a supporting surface incorporated in the compartment, wherein the waste is transported through the compartment from a waste inlet to a waste outlet along a circular path.
Claims18
A method for incinerating combustible waste during the manufacture of cement clinker comprising:
- preheating cement raw material in a preheater system having a calciner;
- burning the preheated cement raw material to form clinker in a kiln in combustion gas;
- cooling the burned clinker in a clinker cooler;
- introducing waste fuel to a waste inlet of a vertically situated first combustion chamber for at least partial combustion therein, said first combustion chamber being a down draft chamber in which there is a downward flow of combustion gas and waste fuel to a waste and gas outlet;
- passing the gas and any at least partially unburned waste from the first combustion chamber to a second combustion chamber through a inlet in the second combustion chamber in communication with the waste outlet of the first combustion chamber, said second combustion chamber having a waste outlet in communication with the calciner and being adaptable to support waste on a supporting surface incorporated in the chamber and further being adaptable to also receive waste fuel for incineration from a source other than the first combustion chamber;
- and
- transporting any waste in the second combustion chamber through the compartment to the waste outlet along a circular path while simultaneously subjecting said waste to incineration.
A method for incinerating combustible waste during the manufacture of cement clinker comprising:
- preheating cement raw material in a preheater system having a calciner;
- burning the preheated cement raw material to form clinker;
- cooling the clinker in a subsequent clinker cooler;
- introducing waste fuel for combustion in a gas to a first combustion chamber;
- passing the gas and any unburned waste from the first combustion chamber to a second combustion chamber in which the unburned waste is further burned;
- and venting hot exhaust gases produced in connection with the incineration of the waste to the preheater system for heating the cement raw meal, wherein the waste fuel retention time in the second combustion chamber is at least ninety times the waste fuel retention time in the first combustion chamber.
A system for the production of mineral combustion products such as cement clinker out of raw meal having a raw meal preheater system with a raw meal calciner, a rotary kiln and a clinker cooler, an improvement comprising
- a vertically situated first combustion chamber having input for combustible waste fuels and waste gases, said first combustion chamber being a down draft chamber in which there is a downward flow of combustion gas and waste fuel to a waste and gas outlet;
- and a second combustion chamber for waste fuels having an inlet flow connected to the outlet of the first combustion chamber and an outlet flow connected to the calciner, said second chamber being adaptable to support waste on a supporting surface incorporated in the compartment and further being adaptable to also receive waste fuel for incineration from a source other than the first combustion chamber and to provide a longer waste residence time than the first combustion chamber, said second chamber having means to transport any waste therein along a circular path to its outlet while simultaneously subjecting said waste to incineration;.
Dependencies are inferred from the claim text.