US4552097A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steam generator with a stationary fluidized-bed hearth
Assignee: Deutsche Babcock Werke AG
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Filing: 1985-01-23
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Granted: 1985-11-12
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Expires: 2005-01-23
Abstract
Abstract A steam generator arranged as a single-pass boiler with a stationary fluidized-bed hearth and a superimposed ash-circulating system. The fluidized bed is divided into several individually controllable sections to which, in each instance, there is associated a belt-charging machine, an ash separation and ash return system, and a secondary air feed line.
Inventors
- 👤 Hans-Georg Jarmuzewski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:51
CPC Classifications
F; F22; F22B; F22B31/00; F22B31/0007; F22B31/0015; F22B31/0023; F22B31/0084; F23; F23C; F23C10/00; F23C10/005; F23C10/02; F23C10/04; F23C10/08; F23C10/10; F23L; F23L15/00; F23L15/02; Y; Y02; Y02E; Y02E20/00; Y02E20/34
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
116 words
A steam generator comprising: a stationary fluidizedbed hearth; a combustion chamber and a gas flue containing outlet-side heating surfaces above said fluidized-bed hearth; immersion-type heating surfaces arranged in said fluidized bed; said fluidized bed being divided into a plurality of individually controlled sections; said steam generator comprising further a single-pass boiler; a gas extractor tube and a cyclone connected to said gas extractor tube at the upper end of said boiler above each section of said fluidized bed; said cyclone having discharge means passing cyclone disclosure to a respective predetermined section; belt-charging means associated with each section and having a spread corresponding to the cross-section of a section; and secondary air feeds arranged above each section.
Claim 2
Dependent Claim
116 words
A steam generator comprising: a stationary fluidizedbed hearth; a combustion chamber and a gas flue containing outlet-side heating surfaces above said fluidized-bed hearth; immersion-type heating surfaces arranged in said fluidized bed; said fluidized bed being divided into a plurality of individually controlled sections; said steam generator comprising further a single-pass boiler; a gas extractor tube and a cyclone connected to said gas extractor tube at the upper end of said boiler above each section of said fluidized bed; said cyclone having discharge means passing cyclone disclosure to a respective predetermined section; belt-charging means associated with each section and having a spread corresponding to the cross-section of a section; and secondary air feeds arranged above each section.
Claim 3
Dependent Claim
20 words
A steam generator according to claim 1, wherein gas temperature at an inlet to said cyclone is substantially 350° C.
Claim 4
Dependent Claim
29 words
A steam generator according to claim 1, including a hot-gas filter following said cyclone on a gas-flow path; and an air preheater with rotating accumulators following said hot-gas filter.
Claim 5
Dependent Claim
32 words
A steam generator according to claim 1, including an ash line leading from the discharge means of the cyclone to said fluidized-bed hearth; and an ash discharge in said ash line means.
Claim 6
Dependent Claim
31 words
A steam generator according to claim 1, wherein said combustion chamber comprises circulation tubes with sides facing said combustion chamber; and a fire-resistant mass on said sides of said circulation tubes.
Claim 7
Dependent Claim
21 words
A steam generator according to claim 1, wherein at least a part of said immersion-type heating surfaces are controlled as superheaters.
Claim 8
Dependent Claim
27 words
A steam generator according to claim 1, wherein said fluidized bed has a superimposed ash circulating system of predetermined quantity matched to a particular fuel in use.
Claim 9
Dependent Claim
20 words
A steam generator according to claim 7, wherein total circulating quantity is adjustable through vortex speed within said fluidized bed.
Claim 10
Dependent Claim
25 words
A steam generator according to claim 7, wherein total circulating quantity is adjustable by degree of separation of the cyclone which is changeable by fittings.
References Cited (Backward Citations)
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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) | 1988-11-11 | 1989-05-13 | 1989-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-11 | 1993-05-13 | 1993-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-11 | 1997-05-13 | 1997-11-12 | $7700.00 | Window Closed / Lapsed |