Patent US4667733A successfully refreshed from Google Patents.
US4667733A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protective device for heat exchangers placed in a duct for smoke filled with fine particles of ash
Assignee: Stein Industrie SA
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Filing: 1985-12-27
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Granted: 1987-05-26
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Expires: 2005-12-27
Abstract
Abstract The present invention relates to a device for protecting heat exchangers placed in a duct (1) for smoke filled with fine particles of ash, e.g. coming from a pulverized coal boiler. The heat exchangers are constituted by parallel grids (10) each comprising a main region (A) fitted with rectilinear lengths (11) of tube extending perpendicularly to the direction of smoke movement, and two end regions (B) fitted with bends (12) and rectilinear lengths (13) of tube extending parallel to the direction of smoke movement. The protective device is constituted by parallel panels (20) which are parallel to the grids (10) of tubes, with each panel (20) being placed between two grids (10) and at each end region (B).
Inventors
- 👤 Roger Bessouat
- 👤 Jean-Claude Mevel
- 👤 Michel Vandycke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:58
CPC Classifications
F; F28; F28D; F28D21/00; F28D21/0001; F28D21/0003; F28D21/0005; F28D21/0007; F16; F16L; F16L55/00; F16L55/02; F16L55/027; F16L57/00; F28F; F28F19/00; F28F9/00; F28F9/005
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
168 words
A protective device for protecting heat exchangers placed within a duct with said duct having smoke filled with fine particles of ash flowing therethrough, the heat exchangers consisting of parallel grids each comprising a main region fitted with rectilinear lengths of tube extending perpendicularly to the direction of smoke movement, and two end regions fitted with bends coupling rectilinear lengths of tube extending parallel to the direction of smoke movement to the lengths of tube extending perpendicularly to the smoke movement, said protective device comprising a plurality of panels fixedly located respectively between each adjacent pair of grids of tubes in each of said end regions, with said panels extending parallel, to the grids of tubes and wherein each panel comprises an open framework assembly having an active portion as an obstacle having a resistance to the passage of smoke which is substantially equivalent to that of the obstacle presented by the main regions constituted by the lengths of rectilinear tubes perpendicular to the direction of smoke movement.
Claim 2
Dependent Claim
168 words
A protective device for protecting heat exchangers placed within a duct with said duct having smoke filled with fine particles of ash flowing therethrough, the heat exchangers consisting of parallel grids each comprising a main region fitted with rectilinear lengths of tube extending perpendicularly to the direction of smoke movement, and two end regions fitted with bends coupling rectilinear lengths of tube extending parallel to the direction of smoke movement to the lengths of tube extending perpendicularly to the smoke movement, said protective device comprising a plurality of panels fixedly located respectively between each adjacent pair of grids of tubes in each of said end regions, with said panels extending parallel, to the grids of tubes and wherein each panel comprises an open framework assembly having an active portion as an obstacle having a resistance to the passage of smoke which is substantially equivalent to that of the obstacle presented by the main regions constituted by the lengths of rectilinear tubes perpendicular to the direction of smoke movement.
Claim 3
Dependent Claim
35 words
A protective device according to claim 1 wherein each panel is generally triangular in shape and being sized to and covering said rectilinear lengths of tube that lie parallel to the direction of smoke movement.
Claim 4
Dependent Claim
25 words
A protective device according to claim 1 wherein each panel is generally rectangular in shape and is sized to and covers an entire end region.
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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) | 1990-05-25 | 1990-11-24 | 1991-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-25 | 1994-11-24 | 1995-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-25 | 1998-11-24 | 1999-05-26 | $7700.00 | Window Closed / Lapsed |