US4201546A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for the thermal treatment of alkali-containing pulverized raw material to be used in the manufacture of cement
Assignee: Kloeckner Humboldt Deutz AG
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Filing: 1978-09-14
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Granted: 1980-05-06
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Expires: 1998-09-14
Abstract
Abstract A method and apparatus for the thermal treatment of alkali-containing pulverent raw material used in the manufacture of cement in which the material is preheated in a preheater and after sintering in a furnace is conveyed to a cooler. Alkali free exhaust air from the cooler is conveyed into the preheater for heating the material and the alkali-containing furnace exhaust gases are cooled by means of adding a portion of the pulverized raw material to them in a heat exchanger. The alkali salts are condensed and are separated off in a dust collecting chamber.
Inventors
- 👤 Horst Herchenbach
- 👤 Hubert Ramesohl
- 👤 Rudolf Kuhs
- 👤 Kurt Schneider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:50
CPC Classifications
C; C04; C04B; C04B7/00; C04B7/36; C04B7/60; C04B7/43
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
170 words
An apparatus for the thermal treatment of alkali-containing raw material used in the manufacture of cement comprising: a sintering furnace, an exhaust gas conduit for hot gases leaving said sintering furnace, a pair of vertically disposed multi-stage preheaters, a feed pipe for introducing material into the lowermost of said multi-stage preheaters, means for introducing a portion of the raw material into said feed pipe, a cooler, means for delivering substantially alkali-free exhaust gas from said cooler into said feed pipe, a pair of heat exchangers connected to said exhaust gas conduit and receiving alkali-laden gases from said sintering furnace, means for introducing another portion of the raw material into said exhaust gas conduit for delivery to said heat exchangers, a dust collector, means for delivering gases from said heat exchanger into said dust collector, a by-pass means connecting said sintering furnace directly with said dust collector, means for injecting still another portion of untreated raw material into said bypass means, and means for injecting a coolant into said bypass means.
Claim 2
Independent Claim
170 words
An apparatus for the thermal treatment of alkali-containing raw material used in the manufacture of cement comprising: a sintering furnace, an exhaust gas conduit for hot gases leaving said sintering furnace, a pair of vertically disposed multi-stage preheaters, a feed pipe for introducing material into the lowermost of said multi-stage preheaters, means for introducing a portion of the raw material into said feed pipe, a cooler, means for delivering substantially alkali-free exhaust gas from said cooler into said feed pipe, a pair of heat exchangers connected to said exhaust gas conduit and receiving alkali-laden gases from said sintering furnace, means for introducing another portion of the raw material into said exhaust gas conduit for delivery to said heat exchangers, a dust collector, means for delivering gases from said heat exchanger into said dust collector, a by-pass means connecting said sintering furnace directly with said dust collector, means for injecting still another portion of untreated raw material into said bypass means, and means for injecting a coolant into said bypass means.
Claim 3
Dependent Claim
32 words
An apparatus according to claim 1 which includes: a combustion means arranged to calcine the raw material in suspension in said feed pipe before said raw material is delivered to said preheaters.
Claim 4
Dependent Claim
21 words
An apparatus according to claim 1 in which each of said pair of heat exchangers includes at least one cyclone separator.
Claim 5
Dependent Claim
20 words
An apparatus according to claim 1 which includes valve means in said bypass means for adjusting the fluid flow therethrough.
Claim 6
Dependent Claim
20 words
An apparatus according to claim 1 which includes means for introducing fresh air into the exhaust side of said furnace.
Claim 7
Dependent Claim
24 words
An apparatus according to claim 1 which includes means for introducing fresh air into the exhaust gas side of said pair of heat exchangers.
References Cited (Backward Citations)
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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) | 1983-05-06 | 1983-11-05 | 1984-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-05-06 | 1987-11-05 | 1988-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-05-06 | 1991-11-05 | 1992-05-06 | $7700.00 | Window Closed / Lapsed |