US4067118A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluidized bed reactor
Assignee: Compagnie pour lEtude et la Realisation de Combustibles Atomiques SAS
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Filing: 1976-02-25
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Granted: 1978-01-10
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Expires: 1996-02-25
Abstract
Abstract The invention relates to a new type of fluidized bed reactor of the so-cad central jet type. This reactor has an annular shape such as that shown in the accompanying drawings. The annulus is defined by vertical cylindrical walls at its upper part, and by conical walls at its lower part, the latter walls being joined to one or more annular pipes. Such an arrangement considerably increases the capacity of the jet reactors. This reactor may be used for a large number of applications: preparation of nuclear fuels, drying of cereals, etc.
Inventors
- 👤 Claude Morin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:29
CPC Classifications
G; G21; G21C; G21C1/00; G21C1/04; G21C1/06; G21C1/07; B; B01; B01J; B01J8/00; B01J8/18; B01J8/24; B01J8/245; B01J2219/00; B01J2219/19; B01J2219/194; B01J2219/1941; B01J2219/1945; Y; Y02; Y02E; Y02E30/00; Y02E30/30
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
115 words
In a central jet fluidized bed reactor in which systematic circulation of the particles comprising the bed is effected by at least one jet of fluid the combination comprising a reactor vessel having walls defining an upright generally annular upper chamber for containing the particles forming the fluidized bed, and means for centrally introducing a generally annular fluidizing stream upwardly into the annular chamber approximately equidistant from the walls wherein the particles of the bed are carried rapidly upward by the fluidizing stream as a diluted bed in a region whose axis is approximately equidistant from the walls which particles then travel down along the vicinity of the walls as a dense nearly unfluidized stream.
Claim 2
Dependent Claim
115 words
In a central jet fluidized bed reactor in which systematic circulation of the particles comprising the bed is effected by at least one jet of fluid the combination comprising a reactor vessel having walls defining an upright generally annular upper chamber for containing the particles forming the fluidized bed, and means for centrally introducing a generally annular fluidizing stream upwardly into the annular chamber approximately equidistant from the walls wherein the particles of the bed are carried rapidly upward by the fluidizing stream as a diluted bed in a region whose axis is approximately equidistant from the walls which particles then travel down along the vicinity of the walls as a dense nearly unfluidized stream.
Claim 3
Dependent Claim
63 words
A fluidized bed reactor according to claim 1, wherein the cross-section of a portion of the annular chamber includes walls which converge towards the base and the means for centrally introducing a generally annular fluidizing stream comprises, the said walls being joined to the orifice of at least one pipe which consists of at least one element comprising an annular fluidizing stream distribution.
Claim 4
Dependent Claim
37 words
A fluidized bed reactor according to claim 2, wherein the fluidizing stream distributor is comprised of a triple pipe consisting of three concentric annular orifices, the external and internal orifices being used to inject the pre-fluidization gas.
Claim 5
Dependent Claim
17 words
A reactor according to claim 2 wherein the annular pipe or pipes include substantially vertical radial partitions.
Claim 6
Dependent Claim
21 words
A reactor according to claim 4, wherein the partitions of the pipe or pipes is inclined with respect to the vertical.
Claim 7
Dependent Claim
34 words
A fluidized bed reactor according to claim 1, including means defining a feed orifice, and means arranged around the annulus in contact with the fluidized bed for regulating the circulation velocity of the particles.
Claim 8
Dependent Claim
88 words
In a process of operating a fluidized bed dryer or reactor the improvement comprising the steps of: introducing particles to be treated into a generally annular chamber; and centrally introducing at least a generally annular stream of fluidizing medium generally upwardly through the particles for carrying the particles rapidly upward as a diluted bed in a region whose axis is approximately centrally disposed in the annular chamber causing the particles to then travel down along the outer regions of the annular chamber as a dense nearly unfluidized stream.
Claim 9
Dependent Claim
88 words
In a process of operating a fluidized bed dryer or reactor the improvement comprising the steps of: introducing particles to be treated into a generally annular chamber; and centrally introducing at least a generally annular stream of fluidizing medium generally upwardly through the particles for carrying the particles rapidly upward as a diluted bed in a region whose axis is approximately centrally disposed in the annular chamber causing the particles to then travel down along the outer regions of the annular chamber as a dense nearly unfluidized stream.
Claim 10
Dependent Claim
10 words
The process according to claim 7 for producing coated particles.
Claim 11
Dependent Claim
18 words
The process according to claim 8 in which the particles to be coated are particles of nuclear fuel.
Claim 12
Dependent Claim
20 words
The process according to claim 7 for the conversion of uranium hexafluoride into uranium dioxide in a fluidized bed reactor.
Claim 13
Dependent Claim
20 words
The process according to claim 9 including providing neutron absorber material in a region inwardly of the generally annular chamber.
Claim 14
Dependent Claim
9 words
The process according to claim 7 for drying cereals.
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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) | 1981-01-09 | 1981-07-11 | 1982-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-09 | 1985-07-11 | 1986-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-09 | 1989-07-11 | 1990-01-10 | $7700.00 | Window Closed / Lapsed |