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US3709474A
Expired / Lapsed
US
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Rotary kiln for the production of a granular, bloated product
Assignee: Saint Gobain Denmark AS
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Filing: 1971-01-18
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Granted: 1973-01-09
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Expires: 1991-01-18
Abstract
Abstract This invention relates to a rotary kiln for the production of a granular bloated clay product, the kiln comprising a drying-kiln section and a burning-kiln section. In the heating zone in which the temperature of the clay granules increases from 300*-400*C to 800*-900*C the kiln is provided with a centrally located gas-flow tube which serves to protect the granules from the oxygen in the flue gas in the heating zone so that the bloating will be very effective. When passing the heating zone the granules pass the annular cavity between the outer surface of the gas-flow tube and the inner surface of the kiln lining. The outer surface of the gas-flow tube is provided with blades extending along the tube so that improved heat transfer from tube to granules is obtained.
Inventors
- 👤 Larsen H Kamstrup
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:12
CPC Classifications
F; F27; F27B; F27B7/00; F27B7/02; F27B7/04; F27B2007/027; F27B2007/043
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
95 words
In a rotary kiln for the production of a granular, bloated clay product, said kiln being of the type using a hot gas and including a drying zone for heating material to a predetermined temperature, a transition zone in flow communication with said drying zone for heating said material to a temperature higher than said predetermined temperature, a burning zone in flow communication with said transition zone, the improvement comprising tubular means disposed in said transition zone for substantially separating the hot gas from said material while said material is located in said traNsition zone.
Claim 2
Dependent Claim
95 words
In a rotary kiln for the production of a granular, bloated clay product, said kiln being of the type using a hot gas and including a drying zone for heating material to a predetermined temperature, a transition zone in flow communication with said drying zone for heating said material to a temperature higher than said predetermined temperature, a burning zone in flow communication with said transition zone, the improvement comprising tubular means disposed in said transition zone for substantially separating the hot gas from said material while said material is located in said traNsition zone.
Claim 3
Dependent Claim
84 words
The invention as claimed in claim 1 wherein said kiln is of the type in which the hot gas flows from said burning zone to said transition zone and then through said drying zone and said tubular means has a funnel shaped portion defining the boundary between said burning zone and said transition zone, said funnel shaped portion having one wide end which faces in the direction of said burning zone and an end that is narrower than said wide end and spaced therefrom.
Claim 4
Dependent Claim
29 words
The invention as claimed in claim 2 wherein said tubular means further includes a hollow tube having one end connected to said narrower end of said funnel shaped portion.
Claim 5
Dependent Claim
27 words
The invention as claimed in claim 3 wherein said hollow tube has a portion spaced from said one end thereof and which extends into said drying zone.
Claim 6
Dependent Claim
104 words
The invention as claimed in claim 4 wherein said kiln comprises a first elongated hollow member having an axis rotation and a generally cylindrically shaped interior surface of a selected diameter and an outlet end, a second elongated hollow member having an axis of rotation and a generally cylindrically shaped interior surface of a diameter greater than said selected diameter and an inlet end surrounding said outlet end of said first member, said funnel shaped portion being disposed in said second member and having a conical exterior surface that tapers in an axial direction radially inwardly from said interior surface of said second member.
Claim 7
Dependent Claim
58 words
The invention as claimed in claim 5 wherein said hollow tube with said funnel shaped portion connected as aforesaid is rigidly supported in said second hollow member and the exterior surfaces of said tube and funnel shaped portion are spaced radially inwardly from the interior surface of said second member to define a cavity for reception of material.
Claim 8
Dependent Claim
41 words
The invention as claimed in claim 6 where the said portion of said hollow tube which extends into said drying zone is rigidly supported in said first hollow member and is rotatable therewith independent of the rotation of said hollow tube.
Claim 9
Dependent Claim
57 words
The invention as claimed in claim 3 wherein said zones of said kiln have interior walls and the exterior of said hollow tube is spaced radially inwardly from said walls to define a cavity and the exterior of said hollow tube is provided with a plurality of blades of heat-conducting material, said blades extending into said cavity.
Claim 10
Dependent Claim
37 words
The invention as claimed in claim 8 wherein said hollow tube is constructed from a plurality of plate segments which are bolted together to form said tube with a said blade being bolted between adjoining plate segments.
Claim 11
Dependent Claim
19 words
The invention as claimed in claim 8 wherein said blades are welded to the exterior of said hollow tube.
Claim 12
Dependent Claim
25 words
The invention as claimed in claim 8 wherein said blades are mounted on the exterior of said hollow tube along the line of a helix.
Claim 13
Dependent Claim
31 words
The invention as claimed in claim 8 wherein each of said blades has an end spaced from said hollow tube, said end having diverging portions in the form of a Y.
Claim 14
Dependent Claim
14 words
The invention as claimed in claim 8 wherein said blades are T-shaped in cross-section.
Claim 15
Dependent Claim
14 words
The invention as claimed in claim 8 wherein said blades are L-shaped in cross-section.
Claim 16
Dependent Claim
17 words
The invention as claimed in claim 8 wherein said blades are provided with ends that are hook-shaped.
Claim 17
Dependent Claim
25 words
The invention as claimed in claim 9 wherein said plate segments are U-shaped in cross-section with the legs of the U converging towards each other.
References Cited (Backward Citations)
US3312455A
Cited
US3454357A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |