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Patent US3908284A successfully refreshed from Google Patents.
US3908284A
Expired / Lapsed
US
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Method of and apparatus for heat transfer in a fluidized bed
Assignee: Czech Academy of Sciences
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Filing: 1972-09-28
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Granted: 1975-09-30
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Expires: 1992-09-28
Abstract
Abstract The bed to be fluidized is initially supported upon a grid provided with a plurality of similar channels the channels shown being V-shaped vertical section, so that the cross-sectional area of the fluidized bed therein continuously increases from the bottom of the channel to the top. A fluidizing medium under pressure is introduced into the chamber containing the grid and the fluidized bed, the fluidizing medium being divided and caused to flow upwardly through the fluidized bed through a plurality of holes through the bottom and the side walls of the channels of the grid, such holes being disposed at varying heights and in such a way that the flowing fluid is uniformly distributed along the height of the fluidized bed. A plurality of pipes containing a heat exchanging fluid are disposed in the channels of the grid. The invention may be employed in a number of chemical as well as physical processes such as the combustion of fuels, the roasting of zinc concentrates, the roasting of pyrites, etc.
Inventors
- 👤 Jaroslav Beranek
- 👤 Milos Kaspar
- 👤 Vladimir Bazant
- 👤 Antonin Chladek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:24
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18; B01J8/24; B01J8/44; B01J8/1836; F; F27; F27B; F27B15/00; F27B15/02; F27B15/10; F28; F28D; F28D13/00; B01J2208/00; B01J2208/00008; B01J2208/00017; B01J2208/00106; B01J2208/00115; B01J2208/00132; Y; Y10; Y10S; Y10S423/00; Y10S423/09; Y10S423/16
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
107 words
Apparatus for creating a fluidized bed of particulate material and for exchanging heat therewith, comprising an enclosure defining a compartment, a fluidized bed-supporting grid disposed horizontally within the compartment intermediate the height thereof to divide the compartment into upper and lower sub-compartments, means to introduce a fluidizing medium under pressure into the lower sub-compartment, the grids having a plurality of channels therein with sidewalls, there being a plurality of holes through the sidewalls of the channels whereby to introduce said fluidizing medium into the bed through the holes, and a plurality of conduits for heat exchange fluid disposed at different heights in the channels in the grid.
Claim 2
Dependent Claim
107 words
Apparatus for creating a fluidized bed of particulate material and for exchanging heat therewith, comprising an enclosure defining a compartment, a fluidized bed-supporting grid disposed horizontally within the compartment intermediate the height thereof to divide the compartment into upper and lower sub-compartments, means to introduce a fluidizing medium under pressure into the lower sub-compartment, the grids having a plurality of channels therein with sidewalls, there being a plurality of holes through the sidewalls of the channels whereby to introduce said fluidizing medium into the bed through the holes, and a plurality of conduits for heat exchange fluid disposed at different heights in the channels in the grid.
Claim 3
Dependent Claim
37 words
Apparatus according to claim 1, wherein the cross-sections of the individual inlet holes in the grid are arranged in such a way that the flowing fluidizing medium is uniformly distributed along the height of the fluidized bed.
Claim 4
Dependent Claim
43 words
Apparatus according to claim 1, wherein the cross-sectional area of the channels in the grid and thus the lower part of the fluidized bed continuously increases with the distance from the lowest hole in the grid to the highest hole in the grid.
Claim 5
Dependent Claim
17 words
Apparatus according to claim 3, wherein the channels in the grid are V-shaped in vertical transverse section.
Claim 6
Independent Claim
137 words
A method of exchanging heat with a fluidized bed of particulate material, comprising disposing a plurality of conduits for heat exchange fluid at different heights in the bed, and introducing a fluidizing medium into the bed at different heights at such a rate that in the lower part of the bed of particles a zone is created through which fluid flows at a rate near the minimum fluidization velocity, the height of such zone varying inversely with the total amount of fluid flowing through the fluidizing bed and varying within a range of heights below the the lowest conduit and above the highest conduit for heat exchange fluid, the geometrical arrangement, the number, the size, and the location of the conduits being determined by the requirements of maximum heat removal and heat supply into the fluid bed.
Claim 7
Independent Claim
137 words
A method of exchanging heat with a fluidized bed of particulate material, comprising disposing a plurality of conduits for heat exchange fluid at different heights in the bed, and introducing a fluidizing medium into the bed at different heights at such a rate that in the lower part of the bed of particles a zone is created through which fluid flows at a rate near the minimum fluidization velocity, the height of such zone varying inversely with the total amount of fluid flowing through the fluidizing bed and varying within a range of heights below the the lowest conduit and above the highest conduit for heat exchange fluid, the geometrical arrangement, the number, the size, and the location of the conduits being determined by the requirements of maximum heat removal and heat supply into the fluid bed.
Claim 8
Dependent Claim
61 words
The method according to claim 5, wherein there are provided a plurality of individual fluid inlet ports for the bed, said ports being disposed at different heights in the bed, and arranging the cross-sections of the individual fluid inlet ports so that the inflowing fluid is evenly distributed along the cross-section of the fluidized bed throughout the height of the bed.
Claim 9
Dependent Claim
81 words
The method according to claim 5, wherein there are provided a plurality of individual fluid inlet ports for the bed, said ports being disposed at different heights in the bed, and wherein the cross-sectional area of fluidizing medium inlet ports continuously increases with the distance from the lowest port to the highest port in such a manner that the necessary change in the heat removal intensity from the fluidized bed corresponds to the change in the overall flow rate of fluid.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |