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US 8,465,278 B2Granted
Apparatus and method for heat recovery from rotary kilns
AssigneeCarmeuse Lime, Inc.
InventorsJeffrey J. Bittner, Hugh E. Crosmun
Life of this patent
Estimating the term…
Abstract
An apparatus and method for recovering heat radiating from the outer surface of a rotary kiln includes an enclosure formed as a stationary housing that has an axially extending opening and closure flaps on circumferential ends of the housing extending towards the shell to form a chamber and an exhaust fan, arranged to draw a flow of air into the housing, which flow of air recovers heat from the kiln shell and is discharged from the chamber for heat recovery therefrom.
Claims18
An apparatus for recovery of heat from a shell of a circular-shaped rotary kiln having an axial length and an outer surface, comprising:
- at least one enclosure in the form of a stationary housing spaced from and extending along at least a portion of the axial length of rotary kiln, the housing having an opening extending axially therealong so as to expose a portion of the shell, and opposed spaced circumferential ends on the housing;
- flexible closure flaps provided along the axially extending opening and attached to the circumferential ends of the housing extending towards the shell, which at least partially close the space extending between the circumferential ends of the housing and the shell so as to retain heat discharged from the shell in a chamber formed between the shell and the housing;
- an exhaust fan for drawing a flow of air into the housing, which flow of air recovers heat from the shell in the chamber, and discharges resultant heated air from the chamber;
- and
- means to recover heat from the heated air discharged from the chamber.
2 more elements
An apparatus for recovery of heat from a shell of a circular-shaped rotary kiln having an axial length and an outer surface, comprising:
- at least one enclosure in the form of a stationary housing spaced from and extending along at least a portion of the axial length of rotary kiln, the housing having an opening extending axially therealong so as to expose a portion of the shell, and opposed spaced circumferential ends on the housing;
- flexible closure flaps provided along the axially extending opening are attached to the circumferential ends of the housing extending towards the shell, which at least partially close the space extending between the circumferential ends of the housing and the shell so as to retain heat discharged from the shell in a chamber formed between the shell and the housing;
- an exhaust fan for drawing a flow of air into the housing, which flow of air recovers heat from the shell in the chamber, and discharges resultant heated air from the chamber;
- and
- means to recover heat from the heated air discharged from the chamber, wherein the stationary housing has an annular wall and corrugations are formed on the annular wall.
2 more elements
An apparatus for recovery of heat from a shell of a circular-shaped rotary kiln having an axial length and an outer surface, comprising:
- at least one enclosure in the form of a stationary housing spaced from and extending along at least a portion of the axial length of rotary kiln, the housing having an opening extending axially therealong so as to expose a portion of the shell, and opposed spaced circumferential ends on the housing;
- flexible closure flaps provided along the axially extending opening are attached to the circumferential ends of the housing extending towards the shell, which at least partially close the space extending between the circumferential ends of the housing and the shell so as to retain heat discharged from the shell in a chamber formed between the shell and the housing;
- an exhaust fan for drawing a flow of air into the housing, which flow of air recovers heat from the shell in the chamber, and discharges resultant heated air from the chamber;
- and
- means to recover heat from the heated air discharged from the chamber, wherein the opening extending between the opposed circumferentially spaced ends of the housing is about ten percent of the circumference of the housing in width.
2 more elements
An apparatus for recovery of heat from a shell of a circular-shaped rotary kiln having an axial length and an outer surface, comprising:
- at least one enclosure in the form of a stationary housing spaced from and extending along at least a portion of the axial length of rotary kiln, the housing having an opening extending axially therealong so as to expose a portion of the shell, and opposed spaced circumferential ends on the housing;
- flexible closure flaps provided along the axially extending opening are attached to the circumferential ends of the housing extending towards the shell, which at least partially close the space extending between the circumferential ends of the housing and the shell so as to retain heat discharged from the shell in a chamber formed between the shell and the housing;
- an exhaust fan for drawing a flow of air into the housing, which flow of air recovers heat from the shell in the chamber, and discharges resultant heated air from the chamber;
- and
- means to recover heat from the heated air discharged from the chamber, wherein a plurality of said enclosures are provided along the axial length of the rotary kiln.
2 more elements
A method for recovering heat from a shell of a circular-shaped rotary kiln having an axial length and an outer surface comprising:
- providing at least one enclosure in the form of a stationary housing spaced from and extending along at least a portion of the axial length of rotary kiln, the housing having an opening extending axially therealong so as to expose a portion of the shell, and opposed spaced circumferential ends and attached to the housing having flexible closure flaps provided along the axially extending opening on the circumferential ends of the housing extending towards the shell, which at least partially close the space extending between the circumferential ends of the housing and the shell so as to retain heat discharged from the shell in a chamber formed between the shell and the housing;
- drawing a flow of air into the housing and through the chamber, which flow of air recovers heat from the shell in the chamber;
- discharging resultant heated air from the chamber, and recovering heat from the heated air discharged from the chamber.
A method for recovering heat from a shell of a circular-shaped rotary kiln having an axial length and an outer surface comprising:
- providing at least one enclosure in the form of a stationary housing spaced from and extending along at least a portion of the axial length of rotary kiln, the housing having an opening extending axially therealong so as to expose a portion of the shell, and opposed spaced circumferential ends are attached to the housing having flexible closure flaps provided along the axially extending opening on the circumferential ends of the housing extending towards the shell, which at least partially close the space extending between the circumferential ends of the housing and the shell so as to retain heat discharged from the shell in a chamber formed between the shell and the housing;
- drawing a flow of air into the housing and through the chamber, which flow of air recovers heat from the shell in the chamber;
- discharging resultant heated air from the chamber, and recovering heat from the heated air discharged from the chamber, wherein a plurality of enclosures are provided along the axial length of the rotary kiln and a flow of air drawn into each of the housings.
Dependencies are inferred from the claim text.