Patent US4552097A successfully refreshed from Google Patents.
US4552097A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steam generator with a stationary fluidized-bed hearth
Assignee: Deutsche Babcock Werke AG
•
Filing: 1985-01-23
•
Granted: 1985-11-12
•
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 09:59
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)
US2842102A
Cited
US4273073A
Cited
US4336769A
Cited
US4436507A
Cited
US4453494A
Cited
US4449483A
Cited
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 |