Patent US3640250A successfully refreshed from Google Patents.
US3640250A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steam temperature control spray system
Assignee: Foster Wheeler Inc
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Filing: 1970-03-24
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Granted: 1972-02-08
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Expires: 1990-03-24
Abstract
Abstract A spray control for adjusting finishing superheater outlet temperature in a once-through generator during startup. The control comprises a low-pressure pump arranged to withdraw liquid from the flash tank of the generator startup bypass and to introduce the liquid into the vapor flow from the flash tank at a point between the flash tank and the finishing superheater. The invention permits exact matching of the enthalpy of the bypass vapor flow entering the superheater with that at the primary superheater outlet at a stage in the turbine loading, when flow is being transferred from the bypass system to the main circuit.
Inventors
- 👤 Raymond M Costello
- 👤 Eugene B Beckman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:56
CPC Classifications
F; F22; F22G; F22G5/00; F22G5/12
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
132 words
A steam temperature control spray system for a once-through vapor generator, said generator comprising: a primary superheater, a finishing superheater, a main flow line between said superheaters including a main flow valve means therein; a startup system comprising a bypass line connected in flow communication with said main flow line upstream of said valve means and said bypass line containing a flash tank therein, piping connected between said flash tank and said finishing superheater to return saturated steam from the flash tank to the finishing superheater, and a liquid drain line connected to said flash tank; the improvement comprising spray means located in said piping between the flash tank and finishing superheAter; and means to transmit a portion of the flash tank liquid drain flow as spray flow to said spray means.
Claim 2
Dependent Claim
132 words
A steam temperature control spray system for a once-through vapor generator, said generator comprising: a primary superheater, a finishing superheater, a main flow line between said superheaters including a main flow valve means therein; a startup system comprising a bypass line connected in flow communication with said main flow line upstream of said valve means and said bypass line containing a flash tank therein, piping connected between said flash tank and said finishing superheater to return saturated steam from the flash tank to the finishing superheater, and a liquid drain line connected to said flash tank; the improvement comprising spray means located in said piping between the flash tank and finishing superheAter; and means to transmit a portion of the flash tank liquid drain flow as spray flow to said spray means.
Claim 3
Dependent Claim
14 words
The system of claim 1 including a low-pressure pump to transmit said spray flow.
Claim 4
Dependent Claim
59 words
The system of claim 2 including a conduit means extending between the flash tank liquid space and the spray means including said pump further including valve means therein, and control means responsive to the temperature at the finishing superheater outlet to control said valve means to deliver a variable amount of flash tank drain flow to said spray means.
Claim 5
Dependent Claim
29 words
The system of claim 3 including means interlocking said valve means with the main flow valve means to close the valve means on opening the main flow valve means.
Claim 6
Dependent Claim
16 words
The system of claim 4 including additional spray means upstream of said main flow valve means.
Claim 7
Dependent Claim
26 words
The system of claim 3 including valve means in the bypass line upstream of the flash tank which causes some pressure reduction in the flow therethrough.
Claim 8
Dependent Claim
15 words
The system of claim 6 including a pressure reducing station upstream of the primary superheater.
Claim 9
Dependent Claim
22 words
The system of claim 3 including means to bleed a variable amount of the output of said pump from said conduit means.
References Cited (Backward Citations)
US3194218A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |