Patent US4550379A successfully refreshed from Google Patents.
US4550379A
Expired / Lapsed
US
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Method of electric power plant operation
Assignee: Toshiba Corp
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Filing: 1983-06-15
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Granted: 1985-10-29
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Expires: 2003-06-15
Abstract
Abstract A machine-implemented method of operating a thermal power generating plant having at least one power generating unit comprises (A) determining, in accordance with a given time point t 1 at which the power generating unit is to become capable of load control and assumed time length T 1 for time length of initial load holding TINT, a predicted value t' PI of a time point t PI of parallel-in, a predicted value t' GT of a time point t GT of a gas turbine start; and a predicted value t' INC of a time point t INC of initial load hold completion; and (B) correcting the predicted values t' PI , t' GT and t' INC by adding k(t 1 -t' INC ) to t' PI , t' GT and t' INC , respectively, k being a given value satisfying 0<k≦1.
Inventors
- 👤 Kensuke Kawai
- 👤 Shuntaro Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:25
CPC Classifications
F; F01; F01K; F01K13/00; F01K13/02; F01K23/00; F01K23/02; F01K23/06; F01K23/10; F01K23/101; Y; Y02; Y02E; Y02E20/00; Y02E20/16
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
143 words
A machine-implemented method of operating a thermal power generating plant having at least one power generating unit comprising the steps of: (A) determining, in accordance with a given time point t 1 at which the power generating unit is to become capable of load control and assumed time length T 1 for time length of initial load holding TINT, a predicted value t' PI of a time point t PI of parallel-in, a predicted value t' GT of a time point t GT of a gas turbine start; and a predicted value t' INC of a time point t INC of initial load hold completion; and (B) correcting the predicted values t' PI , t' GT and t' INC by adding k(t 1-t' INC ) to t' PI , t' GT and t' INC , respectively, k being a given value satisfying 0<k≦1.
Claim 2
Dependent Claim
143 words
A machine-implemented method of operating a thermal power generating plant having at least one power generating unit comprising the steps of: (A) determining, in accordance with a given time point t 1 at which the power generating unit is to become capable of load control and assumed time length T 1 for time length of initial load holding TINT, a predicted value t' PI of a time point t PI of parallel-in, a predicted value t' GT of a time point t GT of a gas turbine start; and a predicted value t' INC of a time point t INC of initial load hold completion; and (B) correcting the predicted values t' PI , t' GT and t' INC by adding k(t 1-t' INC ) to t' PI , t' GT and t' INC , respectively, k being a given value satisfying 0<k≦1.
Claim 3
Dependent Claim
47 words
A method as set forth in claim 1, wherein T 1 is corrected in accordance with the correction of t' PI and t' GT , and the steps (A) and (B) are repeated until the difference (t 1 -t' INC ) becomes smaller than a predetermined value.
Claim 4
Dependent Claim
27 words
A method as set forth in claim 2, the repetition of the steps (A) and (B) is terminated when the number of repetition becomes a predetermined number.
Claim 5
Dependent Claim
124 words
A method as set forth in claim 1, wherein the determination of t' INC at the step (A) is performed by: determining, in accordance with t' PI and a time point T 52G of the latest line-off, a predicted value H FSI of the first stage inner metal temperature at the time point t' PI ; determining, in accordance with given parameters of the plant, a predicted value H FSO of the first stage outlet steam temperature at the time point t' PI ; determining, in accordance with H FSI and H FSO , a time length TRLD 0 of load rising period, and a time length TINT of initial load holding; and determining t' INC from t' PI , TRLD 0 and TINT.
Claim 6
Dependent Claim
63 words
A method as set forth in claim 4, wherein H FSO is determined by: determining a main steam temperature H MST and a main steam pressure H MSO at the time point t' PI , from given parameters of the plant; and determining H FSO from H MST and H MSO in accordance with a function representing the thermodynamic characteristic of the turbine.
Claim 7
Dependent Claim
57 words
A method as set forth in claim 4, wherein TRLD 0 and TINT are determined by: determining a mismatch temperature H MIS from H FSO and H FSI by subtracting H FSI from H FSO ; and determining TRLD 0 and TINT from H MIS in accordance with a given mismatch chart stored in a computer system.
Claim 8
Dependent Claim
114 words
A machine-implemented method of operating a thermal generating plant comprising a plurality of power generating units comprising the steps of: (I) providing a target load schedule; (II) determining, in accordance with the target load schedule, a time point at which there should occur entry into operation of a power generating unit; (III) selecting a power generating unit as one entering into operation at the time point determined at the step (II); (IV) determining a time schedule of start up of the power generating unit selected at the step (III); and (V) implementing the start-up operation of the selected power generating unit in accordance with the time schedule of start-up determined at the step (IV).
Claim 9
Dependent Claim
114 words
A machine-implemented method of operating a thermal generating plant comprising a plurality of power generating units comprising the steps of: (I) providing a target load schedule; (II) determining, in accordance with the target load schedule, a time point at which there should occur entry into operation of a power generating unit; (III) selecting a power generating unit as one entering into operation at the time point determined at the step (II); (IV) determining a time schedule of start up of the power generating unit selected at the step (III); and (V) implementing the start-up operation of the selected power generating unit in accordance with the time schedule of start-up determined at the step (IV).
Claim 10
Dependent Claim
43 words
A method as set forth in claim 7, wherein said step (III) of selecting a power generating unit comprises selecting the power generating unit which, at the time of the entry into operation, will have been out of operation for the shortest time.
Claim 11
Dependent Claim
76 words
A method as set forth in claim 7, further comprising the steps of: (VI) determining, in accordance with the target load schedule, a time point at which there should occur line off of a power generating unit; (VII) selecting a power generating unit as one to be shut down at the time point determined at the step (VI); and (VIII) shutting down the selected power generating unit at the time point determined at the step (VI).
Claim 12
Dependent Claim
144 words
A method as set forth in claim 7, wherein said step (IV) of determining a time schedule comprises the steps of: (A) determining, in accordance with a given time point t 1 at which the power generating unit is to become capable of load control and assumed time length T 1 for time length of initial load holding TINT, a predicted value t' PI of a time point t PI of parallel-in, a predicted value t' GT of a time point t GT of a gas turbine start; and a predicted value t' INC of a time point t INC of initial load hold completion; and (B) correcting the predicted values t' PI , t' GT and t' INC by adding k(t 1 -t' INC ) to t' PI , t' GT and t' INC , respectively, k being a given value satisfying 0<k≦1.
Claim 13
Dependent Claim
47 words
A method as set forth in claim 10, wherein T 1 is corrected in accordance with the correction of t' PI and t' GT , and the steps (A) and (B) are repeated until the difference (t 1 -t' INC ) becomes smaller than a predetermined value.
Claim 14
Dependent Claim
27 words
A method as set forth in claim 10, the repetition of the steps (A) and (B) is terminated when the number of repetition becomes a predetermined number.
Claim 15
Dependent Claim
124 words
A method as set forth in claim 10, wherein the determination of t' INC at the step (A) is performed by: determining, in accordance with t' PI and a time point T 52G of the latest line-off, a predicted value H FSI of the first stage inner metal temperature at the time point t' PI ; determining, in accordance with given parameters of the plant, a predicted value H FSO of the first stage outlet steam temperature at the time point t' PI ; determining, in accordance with H FSI and H FSO , a time length TRLD 0 of load rising period, and a time length TINT of initial load holding; and determining t' INC from t' PI , TRLD 0 and TINT.
Claim 16
Dependent Claim
63 words
A method as set forth in claim 13, wherein H FSO is determined by: determining a main steam temperature H MST and a main steam pressure H MSO at the time point t' PI , from given parameters of the plant; and determining H FSO from H MST and H MSO in accordance with a function representing the thermodynamic characteristic of the turbine.
Claim 17
Dependent Claim
57 words
A method as set forth in claim 13, wherein TRLD 0 and TINT are determined by: determining a mismatch temperature H MIS from H FSO and H FSI by subtracting H FSI from H FSO ; and determining TRLD 0 and TINT from H MIS in accordance with a given mismatch chart stored in a computer system.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-10-28 | 1989-04-29 | 1989-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-28 | 1993-04-29 | 1993-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-28 | 1997-04-29 | 1997-10-29 | $7700.00 | Window Closed / Lapsed |