US3601376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for preheating limestone and the like
Assignee: Kennedy Van Saun Corp
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Filing: 1970-06-04
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Granted: 1971-08-24
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Expires: 1990-06-04
Abstract
Abstract Apparatus for preheating limestone comprising an upright structure including a storage bin at the top, a horizontal bridge and arch structure extending through the central lower portion of the preheater, the upper walls of which slope outwardly, inwardly extending plates directing limestone from the side walls toward the bridge structure and covering a gas receiving space and gas outlets, duct means for introducing hot gases beneath the arch to pass through the stone moving downwardly over the bridge structure onto a sloping floor at each side, means for moving stone along each sloping floor into a discharge passage, a baffle wall extending along at each side of the bridge structure under the plates for dividing the gases leaving the preheating zone, and valve control means in a gas passage outside the baffle wall for varying the flow of gases removed after passing through only a portion of the stone in preheating zone.
Inventors
- 👤 Gerhard Niemitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:01
CPC Classifications
F; F27; F27D; F27D13/00; F28; F28C; F28C3/00; F28C3/10; F28C3/12; F28C3/14
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
50 words
A process as claimed in claim 1, wherein the body of limestone is supported on a continuously downwardly sloping floor to a rim, moving limestone of the body along said floor to a stone discharge at said rim and passing the hot gases initially into the limestone on said floor.
Claim 2
Dependent Claim
26 words
A process as claimed in claim 1, the step of withdrawing said second portion of the preheating gas from an intermediate location in the preheating zone.
Claim 3
Dependent Claim
31 words
A process as claimed in claim 1, the step of varying the portion of the second portion in accordance with the porosity of the body of limestone in the preheating zone.
Claim 4
Dependent Claim
62 words
A process as claimed in claim 1, wherein crushed limestone is advanced downwardly through the preheating zone, passing said first portion into said space from the upper part of said zone, withdrawing said second portion from an intermediate position of the preheating zone and passing it through a bypass passageway into said space overlying the body of limestone in the preheating zone.
Claim 5
Dependent Claim
129 words
In a stone preheater including an upright structure having side and end walls and a floor, a downwardly and outwardly sloping wall for the passage of stone, a stone slide wall sloping downwardly and inwardly from a side wall toward but spaced from the outwardly sloping wall, an inlet for hot gases below the outwardly-sloping wall, an outlet for gases below the stone slide, said outwardly sloping wall, the stone slide, said sidewall and the floor defining a preheating zone, means for directing a first portion of the hot gases completely through the preheating zone, means for bypassing a second portion of the hot gases from the preheating zone after passage through only a portion of the preheating zone, and means for varying the quantity of the second portion.
Claim 6
Dependent Claim
35 words
A stone preheater as claimed in claim 6, wherein the directing means comprises a baffle wall located below the stone slide and extending into the preheating zone in spaced generally parallel relation to said sidewall.
Claim 7
Dependent Claim
33 words
A stone preheater as claimed in claim 7, wherein said baffle and sidewalls define said bypassing means, and means for controlling the gas flow in the bypass passageway between said baffle and sidewalls.
Claim 8
Dependent Claim
59 words
A stone preheater as claimed in claim 6, comprising a central bridge defining downwardly and outwardly sloping walls terminating in spaced relation to the floor, the bridge defining an arch over the hot gas inlet, a stone discharge passage below the arch, and a floor section sloping continuously downwardly from said sidewall to a rim at said discharge passage.
Claim 9
Dependent Claim
53 words
A stone preheater as claimed in claim 7, wherein the baffle wall extends from a position opposite the lower portion of the outwardly and downwardly sloping wall to a position beneath the inwardly sloping wall and below the gas outlet, and a flow control damper in the space between the baffle and sidewalls.
References Cited (Backward Citations)
US3171795A
Cited
US3397460A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |