US3851406A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluidized-bed apparatus
Assignee: IPRAN INST PROIECTARI PENTRU I
•
Filing: 1973-04-23
•
Granted: 1974-12-03
•
Expires: 1993-04-23
Abstract
Abstract The invention relates to an apparatus for processing powder in a fluidized bed, with horizontal circulation and indirect thermal transfer elements, in which: the perforated inlet screen for the fluidizing agent has attached thereto a plurality of tissue (fabric) (in number and location as required for a good fluidization); the tubular transfer elements are horizontal, rectilinear or identically undulated in the space arranged in the flowing direction of the bed and over the entire length thereof (possibly divided for successive processing zones), in a plurality of horizontal rows offset from one row to an other; the uniformizing screen for the gas flow, at the upper part of the treatment space, is of a perforated sheet and is cylindrically vaulted, with its concavity downward and has holes over 30 to 40 percent of its total surface.
Inventors
- 👤 V Anescu
- 👤 M Turtureanu
- 👤 D Stanciu
- 👤 I Dumitru
- 👤 V Grigoras
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:52
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18; B01J8/24; B01J8/36; B01J8/02; B01J8/0285; B01J8/08; B01J8/087; B01J8/1836; F; F28; F28D; F28D13/00; B01J2208/00; B01J2208/00008; B01J2208/00017; B01J2208/00106; B01J2208/00115; B01J2208/00141; B01J2219/00; B01J2219/18; B01J2219/182
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
259 words
An apparatus for the treatment of a powder comprising: housing means defining a fluidized bed chamber elongated horizontally and formed at one end with an inlet for the material to be processed and at the opposite end with an outlet for powder whereby said material traverses said chamber generally horizontally; means forming a fluidizing-gas space below said chamber; a perforated sheet communication in between said space and the bottom of said chamber for admitting fluidizing gas to said chamber to fluidize a bed of said material therein, said chamber having a free space above said bed; at least one filter sheet of fibrous material clinging to said perforated sheet and controlling the flow of fluidizing gas through said perforated sheet into said chamber, said chamber having a pair of lateral walls extending in the longitudinal direction. a downwardly concave vaulted perforated plate in said open space above said bed, said perforated plate permitting the discharge of gas from said chamber and having longitudinal edges spaced from said lateral walls whereby particles deposited upon the upper surface of said perforated plate fall between said edges and said lateral walls into said fluidized bed; a plurality of tubular heat-transfer elements having mutually parallel spaced apart stretches extending longitudinally into said chamber from at least one end thereof within said bed, said elements being spaced across the entire cross section of said bed in a plurality of horizontal rows offset from one row to another; and means for feeding a heat transfer fluid to and removing heat transfer fluid from said elements.
Claim 2
Independent Claim
259 words
An apparatus for the treatment of a powder comprising: housing means defining a fluidized bed chamber elongated horizontally and formed at one end with an inlet for the material to be processed and at the opposite end with an outlet for powder whereby said material traverses said chamber generally horizontally; means forming a fluidizing-gas space below said chamber; a perforated sheet communication in between said space and the bottom of said chamber for admitting fluidizing gas to said chamber to fluidize a bed of said material therein, said chamber having a free space above said bed; at least one filter sheet of fibrous material clinging to said perforated sheet and controlling the flow of fluidizing gas through said perforated sheet into said chamber, said chamber having a pair of lateral walls extending in the longitudinal direction. a downwardly concave vaulted perforated plate in said open space above said bed, said perforated plate permitting the discharge of gas from said chamber and having longitudinal edges spaced from said lateral walls whereby particles deposited upon the upper surface of said perforated plate fall between said edges and said lateral walls into said fluidized bed; a plurality of tubular heat-transfer elements having mutually parallel spaced apart stretches extending longitudinally into said chamber from at least one end thereof within said bed, said elements being spaced across the entire cross section of said bed in a plurality of horizontal rows offset from one row to another; and means for feeding a heat transfer fluid to and removing heat transfer fluid from said elements.
Claim 3
Dependent Claim
37 words
The apparatus defined in claim 1 wherein a respective set of such elements extends into said chamber from each end thereof over respective zones of said bed, said perforated plate and overlying only one of said zones.
Claim 4
Dependent Claim
25 words
The apparatus defined in claim 1 wherein said perforated plate has openings constituting 30 to 40 percent of the total area of said perforated plate.
References Cited (Backward Citations)
US2470395A
Cited
US2797908A
Cited
US3242974A
Cited
US3281508A
Cited
US3216125A
Cited
US3242586A
Cited
US3436837A
Cited
US3514868A
Cited
US3621585A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |