US4813380A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for controlling the operation of a fluidized bed reactor apparatus
Assignee: Amec Foster Wheeler Energia Oy
•
Filing: 1987-11-24
•
Granted: 1989-03-21
•
Expires: 2007-11-24
Abstract
Abstract Solids are separated from the flue gases of a fluidized bed reactor with a circulating bed and provided with cooling surfaces and are recycled to the reactor through return ducts disposed at different heights in the reactor. To control the operation of the reactor the heat removed from the reactor chamber is regulated by changing the suspension density in the reactor chamber. A required suspension density is obtained by regulating the flow of the solids through each return duct.
Inventors
- 👤 Folke Engstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:56
CPC Classifications
F; F23; F23C; F23C1/00; B; B01; B01J; B01J8/00; B01J8/18; B01J8/24; B01J8/38; B01J8/384; B01J8/388; F22; F22B; F22B31/00; F22B31/0007; F22B31/0084; F23C10/00; F23C10/02; F23C10/04; F23C10/08; F23C10/10; F23C2206/00; F23C2206/10; F23C2206/101; F23J; F23J2900/00; F23J2900/15026
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
113 words
A method of controlling temperature in the reactor chamber of a recirculating fluidized bed apparatus comprising the steps of: (a) providing heat transfer surfaces in a plurality of zones at different heights in the reactor chamber; (b) separating solids from gases exhausted from the reactor chamber for recycling to the reactor chamber; (c) controlling the flow of said solids into each of the reactor chamber zones to provide a required suspension density of fluidized solids in each of said zones to thereby control the heat transfer to said surfaces in said zones and thereby maintain a predetermined range of temperatures in said zones of said reactor chamber independent of fuel and reactor loading.
Claim 2
Independent Claim
113 words
A method of controlling temperature in the reactor chamber of a recirculating fluidized bed apparatus comprising the steps of: (a) providing heat transfer surfaces in a plurality of zones at different heights in the reactor chamber; (b) separating solids from gases exhausted from the reactor chamber for recycling to the reactor chamber; (c) controlling the flow of said solids into each of the reactor chamber zones to provide a required suspension density of fluidized solids in each of said zones to thereby control the heat transfer to said surfaces in said zones and thereby maintain a predetermined range of temperatures in said zones of said reactor chamber independent of fuel and reactor loading.
Claim 3
Dependent Claim
84 words
Recirculating fluidized bed reactor apparatus comprising: means for separating solids contained in flue gases exhausted from a reactor chamber; means for recirculating said solids to zones at different heights within said reactor chamber; heat transfer means within each of said zones in said reactor chamber, and means for controlling the solids flowing into each of said zones to provide a required suspension density and therefore a required heat transfer in each of said zones, to thereby control the temperature in each of said zones.
Claim 4
Dependent Claim
84 words
Recirculating fluidized bed reactor apparatus comprising: means for separating solids contained in flue gases exhausted from a reactor chamber; means for recirculating said solids to zones at different heights within said reactor chamber; heat transfer means within each of said zones in said reactor chamber, and means for controlling the solids flowing into each of said zones to provide a required suspension density and therefore a required heat transfer in each of said zones, to thereby control the temperature in each of said zones.
Claim 5
Dependent Claim
41 words
Apparatus as claimed in claim 2, wherein the means for recirculating said solids comprise return ducts and wherein the means for controlling the flow of the solids comprise means for feeding gas, other than flue gas, into in the return ducts.
Claim 6
Dependent Claim
25 words
Apparatus as claimed in claim 2, wherein three return ducts are arranged to feed the solids to the reactor chamber at each of said zones.
References Cited (Backward Citations)
DE115328C
Cited
DE598423C
Cited
US2719631A
Cited
US2901420A
Cited
US3058817A
Cited
US2994666A
Cited
US3100693A
Cited
US3116238A
Cited
FR1325323A
Cited
US3159494A
Cited
DE1442745A1
Cited
DE1767699A1
Cited
US3677715A
Cited
US3698874A
Cited
US4001121A
Cited
US3823693A
Cited
US3897739A
Cited
US4300625A
Cited
US4205965A
Cited
US4165717A
Cited
US4108778A
Cited
US4311670A
Cited
US4103646A
Cited
US4198290A
Cited
US4154581A
Cited
GB2018961A
Cited
WO1980000153A1
Cited
GB2034448A
Cited
EP0033808A1
Cited
US4312301A
Cited
SU879144A1
Cited
US4419966A
Cited
US4427053A
Cited
GB2104408A
Cited
US4522154A
Cited
JPS58148305A
Cited
EP0126001A1
Cited
WO1985000027A1
Cited
US4473033A
Cited
GB2160119A
Cited
US4672918A
Cited
GB2159726A
Cited
US4664887A
Cited
US4699068A
Cited
US4708092A
Cited
US4594967A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-20 | 1992-09-19 | 1993-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-20 | 1996-09-19 | 1997-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-20 | 2000-09-19 | 2001-03-21 | $7700.00 | Window Closed / Lapsed |