US3683866A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Superheating steam generator
Assignee: Combustion Engineering Inc
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Filing: 1970-11-20
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Granted: 1972-08-15
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Expires: 1990-11-20
Abstract
Abstract Described herein is a shell and tube vapor generator in which vaporizable liquid is evaporated and superheated within the same vessel. Downflow and upflow passages are provided for conducting the vaporizable liquid in heat exchange relation with the heating medium that is conducted through the tubes. The downflow passages into which subcooled feedwater is introduced are defined by a plurality of mutually spaced conduits disposed between the shell wall and the tube bundle. The arrangement permits the shell wall to be wetted by liquid at substantially saturated temperature throughout the evaporation region of the chamber thus to reduce the stresses within the tube material caused by thermal loading.
Inventors
- 👤 Paul C Zmola
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:37
CPC Classifications
F; F22; F22B; F22B1/00; F22B1/02; F22B1/023; F22B1/026
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
197 words
Vapor generating apparatus including: a. an elongated shell defining a substantially closed pressure vessel containing a pair of axially spaced, transversely extending tube sheets integrally joined to the wall of said shell and defining a vapor generating chamber therebetween; b. a plurality of substantially straight heat exchange tubes disposed in said vapor generating chamber with their opposite ends attached to the respective tube sheets, said tubes being arranged in a bundle, the outer periphery of which is concentrically spaced from the wall of said shell; c. means for circulating heating fluid through said tubes; and d. means for circulating vaporizable liquid through said vapor generating chamber in heat exchange relation with said tubes comprising: i. feedwater inlet nozzle means penetrating the wall of said shell, ii. a plurality of circumferentially spaced conduits defining separate downflow passages disposed in the space between the outer periphery of the tube bundle and the wall of said shell, the spaces between said conduits placing the wall of said shell in open fluid communication with said vapor generation chamber along substantially the full length of said downflow passage, iii. means for passing feedwater from said inlet nozzle means to the respective conduits.
Claim 2
Dependent Claim
197 words
Vapor generating apparatus including: a. an elongated shell defining a substantially closed pressure vessel containing a pair of axially spaced, transversely extending tube sheets integrally joined to the wall of said shell and defining a vapor generating chamber therebetween; b. a plurality of substantially straight heat exchange tubes disposed in said vapor generating chamber with their opposite ends attached to the respective tube sheets, said tubes being arranged in a bundle, the outer periphery of which is concentrically spaced from the wall of said shell; c. means for circulating heating fluid through said tubes; and d. means for circulating vaporizable liquid through said vapor generating chamber in heat exchange relation with said tubes comprising: i. feedwater inlet nozzle means penetrating the wall of said shell, ii. a plurality of circumferentially spaced conduits defining separate downflow passages disposed in the space between the outer periphery of the tube bundle and the wall of said shell, the spaces between said conduits placing the wall of said shell in open fluid communication with said vapor generation chamber along substantially the full length of said downflow passage, iii. means for passing feedwater from said inlet nozzle means to the respective conduits.
Claim 3
Dependent Claim
38 words
Apparatus as recited in claim 1 wherein said conduits are open at their upper end and include means for passing vapor generated in said vapor generation chamber into said conduits in mixed relation with the feedwater admitted thereto.
Claim 4
Dependent Claim
32 words
Apparatus as recited in claim 2 wherein said feedwater passing means includes an injector nozzle extending into the upper end of each of said conduits in spaced relation from the wall thereof.
Claim 5
Dependent Claim
68 words
Apparatus as recited in claim 2 wherein said feedwater passing means includes: a. an annular manifold surrounding said tube bundle within said vessel and communIcating with said feedwater inlet nozzle, and b. a plurality of circumferentially spaced injector nozzles depending from the lower surface of said manifold for discharging feedwater therefrom, said nozzles extending into the upper ends of said conduits in spaced relation from the wall thereof.
References Cited (Backward Citations)
US3447509A
Cited
GB1086243A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |