Patent US4387668A successfully refreshed from Google Patents.
US4387668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tube arrangement for furnace wall
Assignee: Combustion Engineering Inc
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Filing: 1981-12-28
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Granted: 1983-06-14
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Expires: 2001-12-28
Abstract
Abstract A spiral wound furnace has the spiral wound tubes (18) terminated at the upper end by a vertically sinuous tube (25) with an upper return bend (36) and a lower return bend (38). The lower return bend (38) has a restricted area connection (42) connected to spiral wound tube (18), while the upper return bend (36) has a restricted area connector (44) fluidly connected to header (16).
Inventors
- 👤 Edward L. Kochey, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:58
CPC Classifications
F; F22; F22B; F22B29/00; F22B29/06; F22B29/061; F22B29/065
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
115 words
A furnace wall tubing arrangement for the upper end of a spiral wound boiler furnace comprising: an outlet header; a vertically sinuous tube extending upwardly in the furnace wall from each spiral wound tube to said outlet header, and including an upper return bend and a lower return bend; a first flow connecting means fluidly connecting the bottom of each lower return bend to the respective spiral wound tube, said first flow connecting means having substantially less flow area than said sinuous tube; and a second flow connecting means fluidly connecting the top of each upper return bend to said header, said second flow connecting means having substantially less flow area than said sinuous tube.
Claim 2
Dependent Claim
115 words
A furnace wall tubing arrangement for the upper end of a spiral wound boiler furnace comprising: an outlet header; a vertically sinuous tube extending upwardly in the furnace wall from each spiral wound tube to said outlet header, and including an upper return bend and a lower return bend; a first flow connecting means fluidly connecting the bottom of each lower return bend to the respective spiral wound tube, said first flow connecting means having substantially less flow area than said sinuous tube; and a second flow connecting means fluidly connecting the top of each upper return bend to said header, said second flow connecting means having substantially less flow area than said sinuous tube.
Claim 3
Dependent Claim
20 words
A furnace wall tubing arrangement as in claim 1 wherein said second flow connecting means passes directly to said header.
Claim 4
Dependent Claim
29 words
A furnace wall tubing arrangement as in claim 1 wherein said second flow connection means passes to said header by venting into the outlet leg of said sinuous tube.
References Cited (Backward Citations)
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Cited
US2423997A
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US3033535A
Cited
US3804070A
Cited
US4160701A
Cited
US4178881A
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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) | 1986-06-13 | 1986-12-13 | 1987-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-13 | 1990-12-13 | 1991-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-13 | 1994-12-13 | 1995-06-14 | $7700.00 | Window Closed / Lapsed |