US3896770A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steam generator with split flow preheater
Assignee: Westinghouse Electric Corp
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Filing: 1972-07-24
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Granted: 1975-07-29
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Expires: 1992-07-24
Abstract
Abstract A shell and tube steam generator having a U-shaped or straight tube bundle and a preheater. The preheater is disposed on the cold leg portion of the tube bundle and comprises walls and a plurality of baffles which cooperate to cause the feedwater entering the preheater to split and follow two flow paths, one in a generally upward direction and the other in a generally downward direction. The preheater has an outlet disposed to cause the fluid flowing therefrom to flow across the tube sheet and then upwardly along the outside surface of the tubes to optimize the temperature and pressure of the steam produced and to eliminate the channeling of cold fluid along the tubes which causes thermal stresses and shock on the tube sheet and lower shell.
Inventors
- 👤 Wilbur M Byerley
- 👤 Robert R Bennett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:38
CPC Classifications
F; F22; F22B; F22B1/00; F22B1/02; F22B1/023; F22B1/025
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
266 words
A vapor generator having a plurality of U-shaped tubes forming a tube bundle for providing the heat transfer service required to transfer heat from a first fluid to vaporize and superheat a second fluid, said tube bundle being so disposed within said vapor generator that the first fluid flows through the tubes creating a hot leg portion and a cold leg portion, said vapor generator comprising a tube sheet for receiving the ends of the tubes; a shell portion cooperatively associated with said tube sheet; a wrapper disposed within the shell portion and generally enclosing said tube bundle; a dividing plate cooperatively associated with said wrapper to form an evaporator enclosure incorporating at least a portion of the cold leg portion of the tube bundle and a vapor enclosure incorporating at least a portion of the hot leg portion of the tube bundle; a plurality of baffles disposed within said vapor enclosure causing the fluid flowing therethrough to follow a sinuous path over the outer surface of said portion of the hot leg; a preheater enclosing at least a portion of the cold leg portion of said tube bundle; a fluid inlet nozzle for the second fluid disposed in fluid communication with said preheater; and a fluid outlet nozzle for the second fluid disposed in fluid communication with the vapor enclosure, whereby the second fluid entering the preheater is heated to approximately saturation temperature, flows through the evaporator portion, wherein the second fluid is vaporized, and enters the vapor portion, wherein the vaporized fluid is superheated prior to being discharged through said second fluid outlet nozzle.
Claim 2
Dependent Claim
266 words
A vapor generator having a plurality of U-shaped tubes forming a tube bundle for providing the heat transfer service required to transfer heat from a first fluid to vaporize and superheat a second fluid, said tube bundle being so disposed within said vapor generator that the first fluid flows through the tubes creating a hot leg portion and a cold leg portion, said vapor generator comprising a tube sheet for receiving the ends of the tubes; a shell portion cooperatively associated with said tube sheet; a wrapper disposed within the shell portion and generally enclosing said tube bundle; a dividing plate cooperatively associated with said wrapper to form an evaporator enclosure incorporating at least a portion of the cold leg portion of the tube bundle and a vapor enclosure incorporating at least a portion of the hot leg portion of the tube bundle; a plurality of baffles disposed within said vapor enclosure causing the fluid flowing therethrough to follow a sinuous path over the outer surface of said portion of the hot leg; a preheater enclosing at least a portion of the cold leg portion of said tube bundle; a fluid inlet nozzle for the second fluid disposed in fluid communication with said preheater; and a fluid outlet nozzle for the second fluid disposed in fluid communication with the vapor enclosure, whereby the second fluid entering the preheater is heated to approximately saturation temperature, flows through the evaporator portion, wherein the second fluid is vaporized, and enters the vapor portion, wherein the vaporized fluid is superheated prior to being discharged through said second fluid outlet nozzle.
Claim 3
Dependent Claim
85 words
A steam generator as set forth in claim 1, wherein the wrapper forms an annular chamber adjacent the shell and the preheater has a plurality of baffles which split the influent fluid so that one portion thereof flows downwardly through the preheater, sweeps the tube sheet, flows upwardly into the annular chamber and then to the evaporator portion of the tube bundle and the other portion of the influent fluid flows upwardly through the preheater and then into the evaporator portion of the tube bundle.
References Cited (Backward Citations)
US3547084A
Cited
US3706301A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-28 | 1979-01-27 | 1979-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-28 | 1983-01-27 | 1983-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-28 | 1987-01-27 | 1987-07-29 | $7700.00 | Window Closed / Lapsed |