US3849899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regulating fluidized beds
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1973-04-27
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Granted: 1974-11-26
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Expires: 1993-04-27
Abstract
Abstract The weight of particles in a fluidized bed is regulated substantially independently of the volume of the bed, and hence independently of the flow of fluidizing medium, employing a weir system for removing particles from the bed, the weir system comprising an underflow weir, the lip of which is preferably just above the bottom of the fluidized bed, and a laterally spaced overflow weir, the particles being disengaged from fluidizing medium on passing under the underflow weir and packing in the space between the two weirs to an apparent density which depends on the bed weight. The rate of particle overflow from the overflow weir can be regulated by injecting a fluidizing gas or vapour between the weirs, preferably near the bottom of the space between the weirs.
Inventors
- 👤 R Jenkinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:02
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18; B01J8/1809; C; C10; C10G; C10G11/00; C10G11/14; C10G11/18; C10G11/187; B01J2208/00; B01J2208/00008; B01J2208/00548; B01J2208/00619
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
129 words
A method of regulating the weight of particulate solids in a fluidized bed contacting zone into which particulate solids are passed for fluidization by a fluidizing fluid and out of which particulate solids pass, the method comprising substantially disengaging particulate solids leaving the contacting zone from fluidizing fluid by passing the existing solids under the lip of an underflow weir, which underflow weir provides at least part of a containing wall of the contacting zone, into a space defined by the underflow weir and an overflow weir which is laterally separated from the underflow weir, whereby the solids pack in said space to an apparent density which is substantially independent of the degree of fluidization in the contacting zone, and causing the solids to pass over the overflow weir.
Claim 2
Independent Claim
129 words
A method of regulating the weight of particulate solids in a fluidized bed contacting zone into which particulate solids are passed for fluidization by a fluidizing fluid and out of which particulate solids pass, the method comprising substantially disengaging particulate solids leaving the contacting zone from fluidizing fluid by passing the existing solids under the lip of an underflow weir, which underflow weir provides at least part of a containing wall of the contacting zone, into a space defined by the underflow weir and an overflow weir which is laterally separated from the underflow weir, whereby the solids pack in said space to an apparent density which is substantially independent of the degree of fluidization in the contacting zone, and causing the solids to pass over the overflow weir.
Claim 3
Dependent Claim
33 words
A method according to claim 1 in which said disengagement of said solids and fluids is promoted by spacing the lip of the underflow weir above a bottom portion of the contacting zone.
Claim 4
Dependent Claim
33 words
A method according to claim 2 in which the bottom portion of the contacting zone is provided by a baffle which extends into the contacting zone at least from beneath the underflow weir.
Claim 5
Dependent Claim
27 words
A method according to claim 3 in which said solids/fluid disengagement is promoted by so arranging the baffle that the baffle slopes upwardly into the contacting zone.
Claim 6
Dependent Claim
50 words
A method according to claim 4 in which a fluid selected from the group consisting of gases, vapors, and mixtures thereof is supplied at selected rates to said space between the weirs whereby the rate of transfer of solids out of the contacting zone is varied in a predetermined manner.
Claim 7
Dependent Claim
50 words
A method according to claim 1 in which a fluid selected from the group consisting of gases, vapors, and mixtures thereof is supplied at selected rates to said space between the weirs whereby the rate of transfer of solids out of the contacting zone is varied in a predetermined manner.
Claim 8
Dependent Claim
19 words
A method according to claim 6 in which said fluid is supplied to a bottom region of said space.
Claim 9
Dependent Claim
107 words
A fluidized bed system comprising a vessel for containing a fluidized bed contacting zone in which, during operation, particulate solids are fluidized by a fluidizing fluid passing through said zone, an inlet to the zone for particulate solids, and a weir means defining part of the contacting zone and for promoting substantial disengagement of fluidizing fluid and solids leaving the contacting zone, said weir means cOmprising an underflow weir which provides at least part of a containing wall of the contacting zone, and an overflow weir laterally separated from the underflow weir to define with the underflow weir an exit path for solids leaving the contacting zone.
Claim 10
Dependent Claim
107 words
A fluidized bed system comprising a vessel for containing a fluidized bed contacting zone in which, during operation, particulate solids are fluidized by a fluidizing fluid passing through said zone, an inlet to the zone for particulate solids, and a weir means defining part of the contacting zone and for promoting substantial disengagement of fluidizing fluid and solids leaving the contacting zone, said weir means cOmprising an underflow weir which provides at least part of a containing wall of the contacting zone, and an overflow weir laterally separated from the underflow weir to define with the underflow weir an exit path for solids leaving the contacting zone.
Claim 11
Dependent Claim
24 words
A system according to claim 8 in which the lip of the underflow weir is located above a bottom portion of the contacting zone.
Claim 12
Dependent Claim
34 words
A system according to claim 9 in which the said bottom portion of the contacting zone is provided by a baffle which extends into the contacting zone at least from beneath the underflow weir.
Claim 13
Dependent Claim
22 words
A system according to claim 10 in which the said baffle slopes upwardly into the contacting zone away from the weir means.
Claim 14
Dependent Claim
20 words
A system according to claim 8 in which at least one weir of the weir means has a castillated lip.
Claim 15
Dependent Claim
25 words
A system according to claim 8 in which at least one weir of the weir means has slots formed therein adjacent to the lip thereof.
Claim 16
Dependent Claim
45 words
A system according to claim 8 comprising means for supplying a fluid selected from the group consisting of gases, vapors and mixtures thereof to the space between the weirs for regulating the rate of transfer solids out of the contacting zone in a predetermined manner.
Claim 17
Dependent Claim
25 words
A system according to claim 14 in which said fluid supply means is arranged for supplying said fluid to a bottom zone of said space.
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) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |