Patent US3745940A successfully refreshed from Google Patents.
US3745940A
Expired / Lapsed
US
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Fluidised bed apparatus and method
Assignee: Sprocket Properties Ltd
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Filing: 1971-12-06
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Granted: 1973-07-17
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Expires: 1991-12-06
Abstract
Abstract Fluidised bed apparatus is described in which the fluidising gas is admitted so as to set up a recirculation of solid matter in a chamber through successive zone in which the material is successively unfluidised, fluidised, suspended, and finally recirculated by a secondary air stream across the top of the unfluidised zone. An embodiment of the apparatus as a refuse incinerator is described, comminuted refuse being fed into the bed material within the apparatus.
Inventors
- 👤 S Hibbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:14
CPC Classifications
F; F23; F23G; F23G5/00; F23G5/30; B; B01; B01J; B01J8/00; B01J8/18; B01J8/24; B01J8/38; B01J8/384; B01J8/386
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
200 words
Fluidized bed apparatus comprising a chamber containing a quantity of solid particulate fluidizable material and having means constructed and arranged therewith for defining within said chamber four contiguous zones, namely a fluidized zone, a defluidized zone positioned at one side of said fluidized zone, a suspension zone positioned to the opposite side of the fluidized zone, and a re-circulation zone overlying the fluidized zone and extending between the suspension zone and defluidized zone; said means for defining said zones including a first distribution plate positioned beneath the fluidized zone, a second distribution plate adjacent the lower end of said suspension zone, said first and second distribution plates being constructed and arranged to permit passage of gas therethrough into said fluidized and suspension zones, respectively; gas inlet means in said chamber for permitting the passage of gas into the recirculation zone of said chamber, inlet means in said chamber for the introduction of particulate solid into at least one of said zones; outlet means in said chamber for removing material from at least one of said zones, and said chamber having communication means in communication with a source of pressurized gas to be fed into said fluidized, suspension, and re-circulation zones.
Claim 2
Dependent Claim
200 words
Fluidized bed apparatus comprising a chamber containing a quantity of solid particulate fluidizable material and having means constructed and arranged therewith for defining within said chamber four contiguous zones, namely a fluidized zone, a defluidized zone positioned at one side of said fluidized zone, a suspension zone positioned to the opposite side of the fluidized zone, and a re-circulation zone overlying the fluidized zone and extending between the suspension zone and defluidized zone; said means for defining said zones including a first distribution plate positioned beneath the fluidized zone, a second distribution plate adjacent the lower end of said suspension zone, said first and second distribution plates being constructed and arranged to permit passage of gas therethrough into said fluidized and suspension zones, respectively; gas inlet means in said chamber for permitting the passage of gas into the recirculation zone of said chamber, inlet means in said chamber for the introduction of particulate solid into at least one of said zones; outlet means in said chamber for removing material from at least one of said zones, and said chamber having communication means in communication with a source of pressurized gas to be fed into said fluidized, suspension, and re-circulation zones.
Claim 3
Dependent Claim
53 words
Apparatus according to claim 1 wherein said chamber is defined within an outer shell by means of the distributor plates and further plates extending between opposite walls of the shell, including a generally horizontal baffle plate Immediately above the gas inlet means configured to direct air leaving said inlet in a horizontal direction.
Claim 4
Dependent Claim
37 words
Apparatus according to claim 2 wherein said chamber is generally toroidal in form with its side walls inwardly coned to provide a narrow central zone, said inlet means for solid material being in said narrow central zone.
Claim 5
Dependent Claim
52 words
Apparatus according to claim 1 wherein said source of pressurized gas is a plenum chamber supplying air, and the size and distribution of the apertures in the said distributor plates and the inlet means are selected so as to provide a desired proportioning of air between the said various air admission means.
Claim 6
Independent Claim
134 words
A method of operating fluidized bed apparatus which comprises causing solid particulate fluidizable material to recirculate successively through a fluidized zone, a suspended zone, a re-circulation zone overlying the fluidized zone, and a defluidized zone, including the steps of introducing sufficient gas in the lower end of the fluidized zone to fluidize solid material contained therein, admixing further gas into the lower end of a suspension zone, and directing further gas into the top of the suspension zone in an amount sufficient so as to entrain material entering the suspension zone from the fluidized zone and direct said material into the re-circulation zone across the top of the fluidized zone and towards the defluidization zone so that the solid material becomes defluidized and enters the defluidized zone prior to recirculating to the fluidized zone.
Claim 7
Independent Claim
134 words
A method of operating fluidized bed apparatus which comprises causing solid particulate fluidizable material to recirculate successively through a fluidized zone, a suspended zone, a re-circulation zone overlying the fluidized zone, and a defluidized zone, including the steps of introducing sufficient gas in the lower end of the fluidized zone to fluidize solid material contained therein, admixing further gas into the lower end of a suspension zone, and directing further gas into the top of the suspension zone in an amount sufficient so as to entrain material entering the suspension zone from the fluidized zone and direct said material into the re-circulation zone across the top of the fluidized zone and towards the defluidization zone so that the solid material becomes defluidized and enters the defluidized zone prior to recirculating to the fluidized zone.
Claim 8
Dependent Claim
12 words
The method of claim 5 wherein the gas being introduced is air.
Claim 9
Dependent Claim
34 words
The method of claim 6 wherein refuse material is introduced into said solid particulate fluidized material, and the temperature of said fluidized material is raised sufficiently to consume the combustible portion of said refuse.
Claim 10
Dependent Claim
16 words
The method of claim 7 wherein the non-combustible portion of said refuse and ask is removed.
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) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |