US3683620A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement for protecting a steam treatment device against excess pressure
Assignee: BBC Brown Boveri AG Germany
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Filing: 1969-09-29
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Granted: 1972-08-15
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Expires: 1989-09-29
Abstract
Abstract A steam turbine plant incorporating high and low pressure shaft coupled turbines connected in series in the steam flow path from the steam generator also includes a water separator in the steam flow path between the two turbines. Steam flow control valves controlled by a turbine shaft speed governor function to control the amount of steam going to the turbines, and safety shut-off valves controlled by a turbine shaft speed monitor function to shut-off the steam supply to the turbines in the event the turbine shaft exceeds a predetermined safe speed limit. In order to avoid build-up of any dangerous steam over-pressure from arising within the water separator, steam pressure responsive devices are included which operate in conjunction with the speed responsive controls so as to also shut off the steam flow, thus providing a control system operating conjointly on two different parameters, namely, turbine shaft speed and steam pressure.
Inventors
- 👤 Cornelis Kalverboer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:27
CPC Classifications
G; G05; G05D; G05D13/00; F; F01; F01D; F01D21/00; F01D21/14
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
224 words
In a steam turbine plant, the combination comprising a steam generator, a high pressure turbine, a low pressure turbine shaftcoupled with said high pressure turbine, a steam pipe line leading from said steam generator through said high and low pressure lines in series, a container-enclosed steam treatment device located in said steam line between said high and low pressure turbines, a first steam control system controlled by a governor responsive to actual turbine speed and which actuaTes a steam regulating valve disposed in said steam line in advance of said high pressure turbine for regulating steam flow in relation to speed, a second steam control system controlled by a speed monitor and which responds upon attainment of a turbine speed exceeding a predetermined limit value to actuate to its closed position a safety shut-off valve disposed in said steam line in advance of said high pressure turbine, steam pressure monitoring means located in said steam line between said high and low pressure turbines for continuously monitoring the pressure of the steam entering the container of said steam treatment device while the turbine plant is in operation, and means actuated by said steam pressure monitoring means when the steam pressure exceeds a predetermined maximum safe limit value for effecting actuation of said steam regulating valve and also said safety shut-off valve to their closed positions.
Claim 2
Dependent Claim
224 words
In a steam turbine plant, the combination comprising a steam generator, a high pressure turbine, a low pressure turbine shaftcoupled with said high pressure turbine, a steam pipe line leading from said steam generator through said high and low pressure lines in series, a container-enclosed steam treatment device located in said steam line between said high and low pressure turbines, a first steam control system controlled by a governor responsive to actual turbine speed and which actuaTes a steam regulating valve disposed in said steam line in advance of said high pressure turbine for regulating steam flow in relation to speed, a second steam control system controlled by a speed monitor and which responds upon attainment of a turbine speed exceeding a predetermined limit value to actuate to its closed position a safety shut-off valve disposed in said steam line in advance of said high pressure turbine, steam pressure monitoring means located in said steam line between said high and low pressure turbines for continuously monitoring the pressure of the steam entering the container of said steam treatment device while the turbine plant is in operation, and means actuated by said steam pressure monitoring means when the steam pressure exceeds a predetermined maximum safe limit value for effecting actuation of said steam regulating valve and also said safety shut-off valve to their closed positions.
Claim 3
Dependent Claim
112 words
A steam turbine plant as defined in claim 1 wherein said container-enclosed steam treatment device includes a superheater supplied with heated steam at a pressure higher than that of the steam which is passed through the container, said heated steam being supplied through a steam line which includes two other safety shut-off valves correlated respectively with said first and second steam control systems and which are actuated to their closed positions simultaneously with actuation of said steam regulating and safety shut-off valves in said first and second steam control systems to their closed positions when the steam pressure in the container of said steam treatment device exceeds its maximum safe limit value.
References Cited (Backward Citations)
US3097487A
Cited
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Cited
US3140588A
Cited
US3427464A
Cited
US3360939A
Cited
US3472209A
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 |