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US 7,264,781 B2Granted
Calcining plant and method
AssigneePneumatic Processing Technologies, LLC
InventorMichael A. Jones
Life of this patent
Estimating the term…
Abstract
Particulate material to be calcined is conditioned and then introduced into a stream of flue gases which transport the material along a sloping drying duct while drying the material. The dried material is then introduced into the same stream of flue gases upstream of the drying duct, and the flue gases transport the dried material along a sloping preheating duct while preheating the material. The preheated material is fed tangentially into the lower end of a vertical calcine reactor and calcined product is withdrawn tangentially from the upper end of the reactor. The flue gases used for drying and preheating are produced in the calcine reactor and are cooled during the drying and preheating.
Claims33
A flash calcining plant comprising:
- feeding means for particulate material;
- a treating stage for receiving particulate material from said feeding means and subjecting particulate material to a treatment, said treating stage being provided with a treating stage outlet for discharging particulate material from said treating stage;
- a calcining stage for subjecting particulate material to calcination and for producing heated combustion gases, said calcining stage being provided with a calcining stage outlet for discharging particulate material from said calcining stage, and said treating stage being arranged to receive heated combustion gases from said calcining stage;
- first conveying means arranged to receive particulate material from said treating stage outlet;
- and
- second conveying means arranged to receive particulate material from said calcining stage outlet, said first conveying means and said second conveying means being operable substantially independently of one another.
3 more elements
A flash calcining plant comprising:
- a treating stage for subjecting particulate material to a treatment, said treating stage including an elevated treating zone located above a predetermined level;
- a calcining stage for subjecting particulate material to calcination and for producing heated combustion gases, said treating stage being arranged to receive heated combustion gases from said calcining stage;
- and
- a unit for feeding particulate material directly to said treating zone from below said predetermined level, said unit being operable substantially independently of said treating stage and said calcining stage.
1 more element
A flash calcining plant comprising:
- feeding means for particulate material;
- a treating stage for receiving particulate material from said feeding means and subjecting particulate material to a treatment, said treating stage including a sloped treating zone having an upper end and a lower end;
- a calcining stage for subjecting particulate material to calcination and for producing heated combustion gases, said treating stage being arranged to receive heated combustion gases from said calcining stage;
- and
- means for transporting particulate material along said treating zone, said transporting means including means for entraining particulate material in said treating zone in a stream of gaseous fluid flowing in a direction from said upper end towards said lower end.
2 more elements
A flash calcining plant comprising:
- feeding means for particulate material;
- a calcining reactor having an interior for receiving particulate material from said feeding means and subjecting particulate material to calcination;
- a heating device for said calcining reactor directly exposed to said interior;
- a chamber opening to said interior for receiving rejected matter from said interior;
- and
- a control element for regulating the discharge of rejected matter from said chamber, said control element having a first condition in which the discharge of rejected matter from said chamber is prevented and a second condition in which rejected matter is dischargeable from said chamber, and said control element being capable of assuming both said first condition and said second condition during operation of said heating device.
3 more elements
A method of treating particulate material in a flash calcining plant, said method comprising the steps of:
- feeding said particulate material towards a treating stage and a calcining stage of said flash calcining plant;
- subjecting a first quantity of said particulate material to a treatment in said treating stage;
- subjecting a second quantity of said particulate material to calcination in said calcining stage;
- producing heated combustion gases in said calcining stage;
- discharging said first quantity of particulate material from said treating stage;
- discharging said second quantity of particulate material from said calcining stage;
- conveying said first quantity of particulate material subsequent to the step of discharging said first quantity of particulate material;
- conveying said second quantity of particulate material subsequent to the step of discharging said second quantity of particulate material, the conveying steps being performed substantially independently of one another;
- and
- admitting at least a portion of said heated combustion gases into said treating stage.
7 more elements
A method of treating particulate material in a flash calcining plant, said method comprising the steps of:
- feeding a quantity of said particulate material into an elevated treating zone from below a predetermined level, said treating zone constituting part of a treating stage of said flash calcining plant and being located above said predetermined level;
- subjecting said quantity of particulate material to a treatment in said treating zone;
- producing heated combustion gases in a calcining stage of said flash calcining plant;
- and
- admitting at least a portion of said heated combustion gases into said treating stage, the feeding step being performed substantially independently of said treating stage and said calcining stage.
2 more elements
A method of treating particulate material in a flash calcining plant, said method comprising the steps of:
- feeding said particulate material towards a treating stage and a calcining stage of said flash calcining plant;
- transporting a quantity of said particulate material downward along a sloped path in a treating zone constituting part of said treating stage;
- subjecting said quantity of particulate material to a treatment in said treating zone;
- producing heated combustion gases in said calcining zone;
- and
- admitting at least a portion of said heated combustion gases into said treating zone the transporting step including entraining said quantity of particulate material in a stream of gaseous fluid flowing downward along said sloped path.
3 more elements
A method of treating particulate material in a flash calcining plant, said method comprising the steps of:
- operating a heating device to heat an interior of a calcining reactor constituting part of said flash calcining plant, said heating device being directly exposed to said interior;
- feeding said particulate material into said interior;
- subjecting said particulate material to calcination in said interior during the operating step;
- depositing rejected matter from said interior in a chamber opening to said interior;
- and
- regulating discharge of said rejected matter from said chamber with a control element having a first condition in which the discharge of said rejected matter from said chamber is prevented and a second condition in which said rejected matter is dischargeable from said chamber, the regulating step including maintaining said control element in said second condition during at least part of the operating step.
3 more elements
Dependencies are inferred from the claim text.