Patent DE704700C successfully refreshed from Google Patents.
Patent US4289483A successfully refreshed from Google Patents.
US4289483A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the mutli-step calcination of cement-clinker
Assignee: Kloeckner Humboldt Deutz AG
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Filing: 1979-09-04
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Granted: 1981-09-15
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Expires: 1999-09-04
Abstract
Abstract Apparatus for the production of cement from raw material to the clinker stage is disclosed. The raw material is first heated in a heat exchanger with the heat energy being supplied by the waste heat from subsequent stages of this process. The heated raw material is then passed into a heat exchanger to be partially calcined. Calcination is completed in another heat exchanger, with the waste heat used in the final calcination being supplemented with combustion of a fuel. The calcined material is then passed to a kiln for conversion to clinker, from which the material is then cooled, the warmed cooling air to be used partially for combustion in the kiln and partially during calcination.
Inventors
- 👤 Herbert Deussner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:55
CPC Classifications
F; F27; F27B; F27B7/00; F27B7/20; F27B7/2016; F27B7/2025; F27B7/2033; C; C04; C04B; C04B7/00; C04B7/36; C04B7/43; C04B7/434; F27B15/00; F27B15/003
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
115 words
An apparatus for the production of cement from raw material to the clinker stage which comprises: a preheat heat exchanger means having means for receiving and heating raw material; calcination heat exchanger means which comprise: a precalcination stage means connected to receive material from said preheat heat exchanger, and an after-calcination stage means with means for receiving material from said precalcination stage; a gas inlet means for each of said calcination stages providing heated air therefor; a fuel supply, burner, and air supply for supporting combustion of the burner for said after-calcination stage means of the calcination heat exchanger means; and a fuel fired sintering kiln means connected to receive material from said after-calcination stage.
Claim 2
Independent Claim
115 words
An apparatus for the production of cement from raw material to the clinker stage which comprises: a preheat heat exchanger means having means for receiving and heating raw material; calcination heat exchanger means which comprise: a precalcination stage means connected to receive material from said preheat heat exchanger, and an after-calcination stage means with means for receiving material from said precalcination stage; a gas inlet means for each of said calcination stages providing heated air therefor; a fuel supply, burner, and air supply for supporting combustion of the burner for said after-calcination stage means of the calcination heat exchanger means; and a fuel fired sintering kiln means connected to receive material from said after-calcination stage.
Claim 3
Dependent Claim
57 words
An apparatus for the production of cement from raw materials to the clinker stage as described in claim 1 and which further comprises: a clinker cooler means connected to receive material from the kiln; and an exhaust air conduit leading from the cooler means to said after-calcination stage means for supplying the burner for said after-calcination stage.
Claim 4
Dependent Claim
52 words
An apparatus for the production of cement from raw material to the clinker stage as described in claim 1 and which further comprises: means for collecting exhaust gases from said precalcination and after-calcination stages; and means for conveying said gases to the preheat heat exchanger whereby the raw material therein is heated.
Claim 5
Dependent Claim
63 words
An apparatus for the production of cement from raw material to the clinker stages as described in claim 1 and which further comprises: a conduit form conveying exhaust gases from the sintering kiln to said precalcination stage; and a gas withdrawal conduit upstream from said precalcination stage whereby only a portion of the exhaust gases from the kiln, passes to the precalcination stage.
Claim 6
Dependent Claim
33 words
An apparatus for the production of cement from raw material to the clinker stages as described in claim 1 wherein said preheat heat exchanger and said calcination heat exchanger are cyclone heat exchangers.
Claim 7
Dependent Claim
30 words
An apparatus for the production of cement from raw material to the clinker stages as described in claim 1 wherein said sintering klin is a cylindrically shaped, elongate rotary kiln.
Claim 8
Dependent Claim
52 words
An apparatus for the production of cement from raw material to the clinker stages as described in claim 1 and further comprising: a clinker cooler connected to receive clinker from said sintering kiln, having a plurality of grates supporting the clinker with air able to pass through the clinker on the grates.
Claim 9
Dependent Claim
47 words
An apparatus for the production of cement from raw material to the clinker stages as described in claim 1 and further comprising: a clinker cooler connected to receive material from the kiln and having a plurality of tubes for conducting air for heat exchange with the clinkers.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-14 | 1985-03-16 | 1985-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-14 | 1989-03-16 | 1989-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-14 | 1993-03-16 | 1993-09-15 | $7700.00 | Window Closed / Lapsed |