Patent US4301374A successfully refreshed from Google Patents.
Patent US4471620A successfully refreshed from Google Patents.
US4471620A
Expired / Lapsed
US
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Turbine low pressure bypass spray valve control system and method
Assignee: Siemens Energy Inc
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Filing: 1981-11-13
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Granted: 1984-09-18
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Expires: 2001-11-13
Abstract
Abstract A bypass system for a steam turbine wherein the energy level of the steam bypassed around the intermediate pressure and low pressure turbines is modified by introduction of cooling water. The amount of water introduced is adaptively varied as a function of the enthalpy of the bypassed steam as measured by a sensor in the steam path.
Inventors
- 👤 Morton H. Binstock
- 👤 Leaman B. Podolsky
- 👤 Thomas H. McCloskey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:02
CPC Classifications
F; F01; F01K; F01K7/00; F01K7/16; F01K7/165; F01K9/00; F01K9/04
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
90 words
In a steam turbine system including at least a low pressure turbine and a low pressure steam bypass path for bypassing said turbine, the improvement comprising: (A) low pressure bypass valve means in said bypass path for controlling the flow of steam therein; (B) fluid control valve means for introducing cooling fluid into said bypass path; (C) means for obtaining an indication of the enthalpy of the steam which enters said bypass path; (D) means for controlling said introduction of said cooling fluid as a function of said enthalpy indication.
Claim 2
Dependent Claim
90 words
In a steam turbine system including at least a low pressure turbine and a low pressure steam bypass path for bypassing said turbine, the improvement comprising: (A) low pressure bypass valve means in said bypass path for controlling the flow of steam therein; (B) fluid control valve means for introducing cooling fluid into said bypass path; (C) means for obtaining an indication of the enthalpy of the steam which enters said bypass path; (D) means for controlling said introduction of said cooling fluid as a function of said enthalpy indication.
Claim 3
Dependent Claim
47 words
Apparatus according to claim 1 wherein said means for obtaining includes: (A) temperature sensor means positioned to sense the temperature of the steam in said bypass path and provide a temperature signal indicative thereof, said temperature of said steam being related to said enthalpy of said steam.
Claim 4
Dependent Claim
17 words
Apparatus according to claim 2 wherein: (A) said temperature sensor is in the path of said steam.
Claim 5
Dependent Claim
18 words
Apparatus according to claim 3 wherein: (a) said temperature sensor is positioned upstream of said bypass valve means.
Claim 6
Dependent Claim
128 words
In a steam turbine system including at least a low pressure turbine and a low pressure steam bypass path for bypassing said turbine, the improvement comprising: (A) low pressure bypass valve means in said bypass path for controlling the flow of steam therein; (B) fluid control valve means for introducing cooling fluid into said bypass path; (C) means for obtaining an indication of the enthalpy of the steam which enters said bypass path; (D) means for deriving and providing a steam flow signal indicative of steam flow in said bypass path; (E) means for modifying said steam flow signal as a function of said enthalpy indication; (F) means for controlling the degree of opening of said fluid control valve means in response to said modified steam flow signal.
Claim 7
Dependent Claim
128 words
In a steam turbine system including at least a low pressure turbine and a low pressure steam bypass path for bypassing said turbine, the improvement comprising: (A) low pressure bypass valve means in said bypass path for controlling the flow of steam therein; (B) fluid control valve means for introducing cooling fluid into said bypass path; (C) means for obtaining an indication of the enthalpy of the steam which enters said bypass path; (D) means for deriving and providing a steam flow signal indicative of steam flow in said bypass path; (E) means for modifying said steam flow signal as a function of said enthalpy indication; (F) means for controlling the degree of opening of said fluid control valve means in response to said modified steam flow signal.
Claim 8
Dependent Claim
47 words
Apparatus according to claim 5 wherein said means for obtaining includes: (A) temperature sensor means positioned to sense the temperature of the steam in said bypass path and provide a temperature signal indicative thereof, said temperature of said steam being related to said enthalpy of said steam.
Claim 9
Dependent Claim
48 words
Apparatus according to claim 6 which includes: (A) conversion means responsive to said temperature signal and operative to derive a multiplication factor as a function thereof; and wherein (B) said means for modifying applies said multiplication factor to said steam flow signal to derive a desired flow signal.
Claim 10
Dependent Claim
55 words
Apparatus according to claim 7 which includes: (A) means for deriving and providing an actual fluid flow signal indicative of cooling fluid flow; and wherein said means for controlling includes: (B) a controller responsive to said actual flow signal and said desired flow signal to generate a control signal to control said degree of opening.
Claim 11
Dependent Claim
15 words
Apparatus according to claim 8 wherein: (A) said controller is a proportional plus integral controller.
Claim 12
Dependent Claim
31 words
Apparatus according to claim 7 wherein: (A) said means for modifying is a multiplication circuit which multiplies said steam flow signal by said multiplication factor to derive said desired flow signal.
Claim 13
Dependent Claim
47 words
Apparatus according to claim 7 wherein: (A) if said desired and actual flow signals are equal, said control signal does not vary; and which includes, (B) means for summing said control signal and said desired flow signal to generate a signal for controlling said degree of opening.
Claim 14
Dependent Claim
33 words
Apparatus according to claim 7 wherein said conversion means includes: (A) amplifier means operative to receive and amplify said temperature signal; (B) means for modifying said amplified signal by a predetermined constant amount.
Claim 15
Dependent Claim
18 words
Apparatus according to claim 12 wherein: (A) said predetermined constant amount is representative of a minimum multiplication factor.
Claim 16
Dependent Claim
18 words
Apparatus according to claim 12 wherein: (A) said predetermined constant amount is representative of a maximum multiplication factor.
Claim 17
Dependent Claim
35 words
Apparatus according to claim 6 wherein said steam turbine system includes a reheater in the steam flow path and wherein: (A) said temperature sensor means is positioned to sense the output temperature of said reheater.
Claim 18
Dependent Claim
87 words
In a steam turbine system including at least a low pressure turbine and a low pressure steam bypass path for bypassing said turbine, said bypassed steam being discharged into a condenser, the method of controlling the fluid entering said condenser comprising the steps of: (A) introducing cooling fluid into said bypass path; and (B) controlling the introducton of said cooling fluid so as to maintain the enthalpy of the fluid entering said condenser at a substantially constant value, over the operating temperature range of said bypassed steam.
Claim 19
Dependent Claim
87 words
In a steam turbine system including at least a low pressure turbine and a low pressure steam bypass path for bypassing said turbine, said bypassed steam being discharged into a condenser, the method of controlling the fluid entering said condenser comprising the steps of: (A) introducing cooling fluid into said bypass path; and (B) controlling the introducton of said cooling fluid so as to maintain the enthalpy of the fluid entering said condenser at a substantially constant value, over the operating temperature range of said bypassed steam.
Claim 20
Dependent Claim
75 words
In a steam turbine sytem including at least a low pressure turbine and a low pressure steam bypass path for bypassing said turbine, said bypassed steam being discharged into a condenser, the method of controlling the fluid entering said condenser comprising the steps of: (A) obtaining an indication of the enthalpy of the steam which enters said bypass path; and (B) introducing cooling fluid into said bypass path as a function of said enthalpy indication.
Claim 21
Dependent Claim
75 words
In a steam turbine sytem including at least a low pressure turbine and a low pressure steam bypass path for bypassing said turbine, said bypassed steam being discharged into a condenser, the method of controlling the fluid entering said condenser comprising the steps of: (A) obtaining an indication of the enthalpy of the steam which enters said bypass path; and (B) introducing cooling fluid into said bypass path as a function of said enthalpy indication.
Claim 22
Dependent Claim
27 words
A method according to claim 17 which includes the step of: (A) measuring the temperature of the steam entering said bypass path to obtain said enthalpy indication.
Claim 23
Dependent Claim
59 words
Apparatus according to claim 17 which includes the steps of: (A) obtaining a bypass steam flow indication; (B) obtaining a cooling fluid low indication; (C) modifying said steam flow indication as a function of said enthalpy indication; and (D) comparing said cooling fluid flow indication with said modified steam flow indication to control said introduction of said cooling fluid.
References Cited (Backward Citations)
US3774396A
Cited
US4372125A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-18 | 1988-03-19 | 1988-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-18 | 1992-03-19 | 1992-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-18 | 1996-03-19 | 1996-09-18 | $7700.00 | Window Closed / Lapsed |