Patent US4088438A successfully refreshed from Google Patents.
US4088438A
Expired / Lapsed
US
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Apparatus for the heat treatment of fine-grained material
Assignee: Kloeckner Humboldt Deutz AG
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Filing: 1976-09-17
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Granted: 1978-05-09
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Expires: 1996-09-17
Abstract
Abstract An apparatus for the heat treatment of fine-grained material, particularly pulverized raw material for use in the manufacture of cement, the apparatus comprising a preheater composed of a plurality of superimposed cyclones, the preheater feeding a rotary kiln. An exhaust conduit is connected to the rotary kiln and has a combustion zone formed therein. The gas discharge from one of the intermediate cyclones is directed into the combustion zone. The exhaust conduit includes a pair of upper and lower concentric conduits, the upper conduit having its lower end received in spaced relation to the upper end of the lower conduit and terminating at the combustion zone. A fuel feed conduit is disposed between the lower end of the upper conduit and the upper end of the lower conduit. The arrangement provides for a more efficient treatment of finely divided particles with the hot gases.
Inventors
- 👤 Herbert Deussner
- 👤 Hubert Ramesohl
- 👤 Horst Herchenbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:22
CPC Classifications
F; F27; F27B; F27B7/00; F27B7/20; F27B7/2016; F27B7/2025; F27B7/2033
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
135 words
An apparatus for the heat treatment of fine-grained material comprising a preheater composed of a plurality of superimposed cyclones, a rotary kiln in series with said preheater, an exhaust conduit connected to said rotary kiln and having a combustion zone therein, means connecting the gas discharge from one of the intermediate cyclones into said combustion zone, said exhaust conduit including upper and lower concentric conduits, the upper conduit being of smaller diameter than said lower conduit and having its lower end received in spaced relation to the upper end of the lower conduit and terminating at said combustion zone, a fuel feed conduit disposed between said lower end of said upper conduit and said upper end of said lower conduit and being spaced from both, and means for delivering fuel into said fuel feed conduit.
Claim 2
Independent Claim
135 words
An apparatus for the heat treatment of fine-grained material comprising a preheater composed of a plurality of superimposed cyclones, a rotary kiln in series with said preheater, an exhaust conduit connected to said rotary kiln and having a combustion zone therein, means connecting the gas discharge from one of the intermediate cyclones into said combustion zone, said exhaust conduit including upper and lower concentric conduits, the upper conduit being of smaller diameter than said lower conduit and having its lower end received in spaced relation to the upper end of the lower conduit and terminating at said combustion zone, a fuel feed conduit disposed between said lower end of said upper conduit and said upper end of said lower conduit and being spaced from both, and means for delivering fuel into said fuel feed conduit.
Claim 3
Dependent Claim
33 words
An apparatus according to claim 1 in which the upper end of said lower conduit has an enlarged end portion in which said upper conduit is received and which provides said combustion chamber.
Claim 4
Dependent Claim
22 words
An apparatus according to claim 1 in which said combustion chamber is generally cylindrical and is provided with a tangential gas discharge.
Claim 5
Dependent Claim
20 words
An apparatus according to claim 3 which includes means connecting said tangential gas discharge with one of the intermediate cyclones.
Claim 6
Dependent Claim
21 words
An apparatus according to claim 1 in which said fuel feed conduit has a tangentially disposed inlet for receiving fuel therein.
Claim 7
Dependent Claim
22 words
An apparatus according to claim 1 in which said fuel feed conduit discharges slightly above the lower end of said upper conduit.
Claim 8
Dependent Claim
15 words
An apparatus according to claim 1 which includes an auxiliary burner in said combustion chamber.
Claim 9
Dependent Claim
21 words
An apparatus according to claim 1 including a material feed conduit leading from an intermediate cyclone to the fuel feed conduit.
Claim 10
Dependent Claim
34 words
An apparatus according to claim 1 including a centrifugal chamber arranged concentrically around the upper conduit with its low end discharging into the lower conduit and having a fuel injection conduit leading tangentially therein.
Claim 11
Dependent Claim
17 words
An apparatus according to claim 9 including means for feeding solid fuel into said fuel injection conduit.
Claim 12
Dependent Claim
16 words
An apparatus according to claim 9 wherein said centrifugal chamber is coaxial with said upper conduit.
Claim 13
Dependent Claim
23 words
An apparatus according to claim 9 wherein the fuel feed conduit is spaced radially outwardly from the lower end of the centrifugal chamber.
Claim 14
Dependent Claim
24 words
An apparatus according to claim 1 wherein the fuel feed conduit tangentially enters the lower conduit above the lower end of the upper conduit.
Claim 15
Dependent Claim
18 words
An apparatus according to claim 9 including a withdrawal valve in the upper conduit within the centrifugal chamber.
Claim 16
Dependent Claim
14 words
An apparatus according to claim 1 including an auxiliary burner within said lower conduit.
References Cited (Backward Citations)
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US3980486A
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US3904353A
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US3910754A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-08 | 1981-11-07 | 1982-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-08 | 1985-11-07 | 1986-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-08 | 1989-11-07 | 1990-05-09 | $7700.00 | Window Closed / Lapsed |