Patent US3556495A successfully refreshed from Google Patents.
US3556495A
Expired / Lapsed
US
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Rotary kilns with planetary coolers
Assignee: FLSmidth and Co AS
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Filing: 1969-01-03
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Granted: 1971-01-19
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Expires: 1989-01-03
Abstract
Abstract Rotary kiln having planetary-cooling tubes is insulated in a special way and the tubes are provided with lifters which produce curtains of falling material and thus increase the heat carried into the kiln in the secondary air. This heat exchange is so effective that the heat lost in the material that leaves the tubes is compensated for by the increase in heat carried into the kiln in the secondary air.
Inventors
- 👤 Flemming Edvin Jensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:50
CPC Classifications
F; F27; F27B; F27B7/00; F27B7/14; F27B7/16; F27B7/161
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
116 words
A rotary kiln having a number of cylindrical-cooler tubes mounted in planetary fashion around its outlet end with their axes parallel or substantially parallel to the kiln axis, the inlet end of each cooler tube being connected to an outlet of the rotary kiln by a supply chute, in which lifters which produce curtains of falling material when the kiln is in use are provided in each cooler tube, the improvement wherein each cooler tube is lined with wearing plates, some of which are provided with lifters, the wearing plates being spaced inwardly from the inner surface of the tube, removably secured thereto and thermally insulated from the tube to reduce loss of heat by radiation.
Claim 2
Dependent Claim
116 words
A rotary kiln having a number of cylindrical-cooler tubes mounted in planetary fashion around its outlet end with their axes parallel or substantially parallel to the kiln axis, the inlet end of each cooler tube being connected to an outlet of the rotary kiln by a supply chute, in which lifters which produce curtains of falling material when the kiln is in use are provided in each cooler tube, the improvement wherein each cooler tube is lined with wearing plates, some of which are provided with lifters, the wearing plates being spaced inwardly from the inner surface of the tube, removably secured thereto and thermally insulated from the tube to reduce loss of heat by radiation.
Claim 3
Dependent Claim
43 words
A rotary kiln according to claim 1 in which a lengthwise portion of each cooler tube extending from the inlet end is internally insulated by a layer of insulating material disposed between the wearing plates and the inner wall of the cooler tube.
Claim 4
Dependent Claim
33 words
A rotary kiln according to claim 2 in which only the portion extending from the inlet end is internally insulated, and the remaining length of the tube is insulated by external insulating material.
Claim 5
Dependent Claim
23 words
A rotary kiln according to claim 3 in which the wearing plates, beneath which there is insulating material, are recessed to receive it.
Claim 6
Dependent Claim
41 words
A rotary kiln according to claim 4 in which the wearing plates that have recesses are bolted to the cooler tube wall and have small supporting ribs on their outer faces, only those ribs making direct contact with the tube wall.
Claim 7
Dependent Claim
27 words
A rotary kiln according to claim 1 in which the lifters are trough-shaped helical conveyor flights composed of sections, each section being mounted on a wearing plate.
Claim 8
Dependent Claim
23 words
A rotary kiln according to claim 6 in which the conveyor flights are stiffened by external stays or internal transverse ribs or both.
Claim 9
Dependent Claim
60 words
A rotary kiln according to claim 6 having in addition a ring of scoops at the air-inlet end of each tube to produce a transverse curtain of material over that side of the tube in which conveyor flights are moving upwards and thus To impede the entry of the incoming air into some of the channels formed between adjacent curtains.
References Cited (Backward Citations)
US1885845A
Cited
US2845259A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |