US3595542A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preheater using downwardly flowing, directly contacting, fluidizing vapors from calcining stage of calcerous material
Assignee: Fawkham Developments Ltd
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Filing: 1968-11-05
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Granted: 1971-07-27
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Expires: 1988-11-05
Abstract
Abstract This invention relates to a method and apparatus for fluidizing particulate material with a dust-laden gas and to a method and apparatus for calcining granular material in which dust-laden products of combustion from a calciner are used to fluidize and preheat the granular material subsequently delivered to the calciner.
Inventors
- 👤 Neville David Ashman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:51
CPC Classifications
F; F27; F27B; F27B15/00; Y; Y10; Y10S; Y10S423/00; Y10S423/09; Y10S423/16
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
40 words
An improvement as claimed in claim 1 wherein said gaseous combustion products are passed through a horizontally extending manifold to said tube which depends therefrom, the tube extending into a vessel, the lower part of which constitutes the fluidizing zone.
Claim 2
Dependent Claim
46 words
An improvement as claimed in claim 2, comprising blowing a second gas upwardly in said vessel through a bottom perforated portion thereof facing the open end of the tube to prevent buildup on the bottom of the vessel of dust contained in the gaseous combustion product.
Claim 3
Dependent Claim
28 words
An improvement as claimed in claim 3, comprising heating the second gas before blowing it upwardly in the vessel by preliminarily contacting the second gas with the tube.
Claim 4
Dependent Claim
28 words
An improvement as claimed in claim 4, wherein the second gas is heated by being passed tHrough a heat exchanger on said tube and contained within said vessel.
Claim 5
Dependent Claim
13 words
An improvement as claimed in claim 3, wherein said second gas is air.
Claim 6
Dependent Claim
114 words
In an apparatus for calcining granular material in a calcining calcareous vessel with a fluidized bed, an improvement comprising outlet means for withdrawing gaseous combustion products from the calcining vessel, a preheater vessel containing a second bed of granular material to be subsequently calcined, a vertical tube in said preheater vessel having an open lower end at a level below the static surface of the second bed, means connecting said tube and said outlet means to cause said gaseous combustion products to flow directly into said second bed and produce fluidization thereof and consequent heat transfer therewith, and means for conveying the now heated granular products in said preheater vessel into the calcining vessel.
Claim 7
Dependent Claim
45 words
An improvement as claimed in claim 7 comprising means for injecting a second gas upwardly in said preheater vessel at the bottom thereof and in registry with the open lower end of the tube to prevent dust accumulation at said bottom of the preheater vessel.
Claim 8
Dependent Claim
23 words
An improvement as claimed in claim 7, wherein said preheater vessel is cylindrical with an inwardly tapered lower portion constituting a fluidizing zone.
Claim 9
Dependent Claim
35 words
An improvement as claimed in claim 7, wherein said preheater vessel includes a lower wall with a perforated portion beneath the open lower end of the tube, and a plenum chamber beneath said lower wall.
Claim 10
Dependent Claim
48 words
An improvement as claimed in claim 10, comprising a heat exchanger on said tube in said preheater vessel, and means for passing gas through said heat exchanger and into said plenum chamber for passage of the thus heated gas through said perforated portion and into said second bed.
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) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |