IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0542580
(2009-08-17)
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등록번호 |
US-8419344
(2013-04-16)
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발명자
/ 주소 |
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
0 인용 특허 :
7 |
초록
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In certain embodiments, a system includes a physical computing device having a tangible machine-readable medium including code. The code is adapted to determine an efficiency of a section of a steam turbine based on a relationship between enthalpy difference values and leakage flow rate values betwe
In certain embodiments, a system includes a physical computing device having a tangible machine-readable medium including code. The code is adapted to determine an efficiency of a section of a steam turbine based on a relationship between enthalpy difference values and leakage flow rate values between adjacent sections of the steam turbine. The relationship includes a point of equalizing an enthalpy of the leakage and an enthalpy at a destination of the leakage.
대표청구항
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1. A system, comprising: a physical computing device having a tangible machine-readable medium comprising code that, when in operation:determines an efficiency of a section of a steam turbine based on a relationship between enthalpy difference values and leakage flow rate values between adjacent sec
1. A system, comprising: a physical computing device having a tangible machine-readable medium comprising code that, when in operation:determines an efficiency of a section of a steam turbine based on a relationship between enthalpy difference values and leakage flow rate values between adjacent sections of the steam turbine, wherein the relationship includes a point of relating an enthalpy of the leakage and an enthalpy at a destination of the leakage, wherein the point of relating the enthalpy of the leakage and the enthalpy at the destination of the leakage is achieved by adjusting a temperature of at least one of the adjacent sections of the steam turbine;calculates a plurality of enthalpy difference values between a first inlet into an intermediate-pressure section of the steam turbine and a second inlet into a high-pressure section of the steam turbine for a plurality of operating points of the steam turbine;calculates a plurality of mid-casing packing leakage flow rate percentages based at least in part on a plurality of mid-casing packing leakage enthalpies for the plurality of operating points and an assumed efficiency of the intermediate-pressure section; anddetermines a true efficiency of the intermediate-pressure section based on a relationship between the plurality of enthalpy difference values and the plurality of mid-casing packing leakage flow rate percentages. 2. The system of claim 1, wherein the relationship is obtained in the field via a testing method. 3. The system of claim 1, wherein the mid-casing packing leakage flow rate percentages comprise percentages of mid-casing packing leakage flow rate values compared to flow rates of steam into the second inlet into the high-pressure section. 4. The system of claim 1, wherein the code, when in operation: (a) estimates a plurality of enthalpies of mid-casing packing leakage from the high-pressure section to the intermediate-pressure section for the plurality of operating points;(b) re-calculates the plurality of mid-casing packing leakage flow rate percentages based at least in part on the plurality of enthalpies of mid-casing packing leakage for each of the plurality of operating points and the assumed efficiency of the intermediate-pressure section;(c) determines a linear relationship between the plurality of enthalpy difference values and the plurality of mid-casing packing leakage flow rate percentages for the plurality of operating points;(d) reduces the assumed efficiency of the intermediate-pressure section by a predetermined incremental amount; and(e) repeats steps (b) through (d) until the linear relationship indicates that the plurality of mid-casing packing leakage flow rate percentages are substantially constant between the plurality of operating points. 5. The system of claim 4, wherein the assumed efficiency is approximately equal to a true efficiency of the intermediate-pressure section when the linear relationship indicates the plurality of mid-casing packing leakage flow rate percentages are substantially constant between the plurality of operating points. 6. The system of claim 4, wherein the plurality of mid-casing packing leakage flow rate percentages are approximately equal to an actual mid-casing packing leakage flow rate percentage when the linear relationship indicates the plurality of mid-casing packing leakage flow rate percentages are substantially constant between the plurality of operating points. 7. A system, comprising: a physical computing device having a tangible machine-readable medium comprising code that, when in operation: establishes first, second, and third operating points of a steam turbine by adjusting a temperature at a first inlet into an intermediate-pressure section of the steam turbine;calculates first, second, and third enthalpy difference values between the first inlet into the intermediate-pressure section and a second inlet into a high-pressure section of the steam turbine for the first, second, and third operating points, respectively;calculates first, second, and third apparent efficiencies of the intermediate-pressure section for the first, second, and third operating points, respectively;determines a linear relationship between the first, second, and third enthalpy difference values and the first, second, and third apparent efficiencies for the first, second, and third operating points, respectively; andcalculates a true efficiency of the intermediate-pressure section by using the linear relationship and an estimated enthalpy of leakage from the high-pressure section to the intermediate-pressure section. 8. The system of claim 7, wherein the third operating point is an operating point where a first calculated enthalpy at the first inlet into the intermediate-pressure section is approximately equal to a second calculated enthalpy at the second inlet into the high-pressure section. 9. The system of claim 7, wherein the code, when in operation, controls an inter-stage attemperator of a heat recovery steam generation system. 10. The system of claim 7, wherein the code, when in operation, adjusts the third apparent efficiency by an offset value of the linear relationship corresponding to the estimated enthalpy of leakage from the high-pressure section to the intermediate-pressure section. 11. The system of claim 7, wherein the code, when in operation, determines the estimated enthalpy of leakage from the high-pressure section to the intermediate-pressure section using an enthalpy-drop expansion line based on test data and/or a steam turbine manufacturer's estimating method. 12. The system of claim 7, wherein the code, when in operation, calculates the true efficiency of an intermediate-pressure section of an opposed flow steam turbine. 13. A system, comprising: a steam turbine controller that, when in operation: (a) establishes first, second, and third operating points of a steam turbine by adjusting a temperature at a first inlet into an intermediate-pressure section of the steam turbine;(b) calculates first, second, and third enthalpy difference values between the first inlet into the intermediate-pressure section and a second inlet into a high-pressure section of the steam turbine for the first, second, and third operating points, respectively;(c) calculates first, second, and third apparent efficiencies of the intermediate-pressure section for the first, second, and third operating points, respectively;(d) estimates first, second, and third enthalpies of mid-casing packing leakage from the high-pressure section to the intermediate-pressure section for the first, second, and third operating points, respectively;(e) calculates first, second, and third mid-casing packing leakage flow rate percentages based at least in part on the first, second, and third enthalpies of mid-casing packing leakage for each of the first, second, and third operating points and an assumed efficiency of the intermediate-pressure section;(f) determines a linear relationship between the first, second, and third enthalpy difference values and the first, second, and third mid-casing packing leakage flow rate percentages for the first, second, and third operating points;(g) reduces the assumed efficiency of the intermediate-pressure section by a predetermined incremental amount; and(h) repeats steps (e) through (g) until the linear relationship indicates that the first, second, and third mid-casing packing leakage flow rate percentages are substantially constant between the first, second, and third operating points. 14. The system of claim 13, wherein the mid-casing packing leakage flow rate percentages comprise percentages of mid-casing packing leakage flow rate values compared to flow rates of steam into the second inlet into the high-pressure section. 15. The system of claim 13, wherein the assumed efficiency is approximately equal to a true efficiency of the intermediate-pressure section when the linear relationship indicates the first, second, and third mid-casing packing leakage flow rate percentages are substantially constant between the first, second, and third operating points. 16. The system of claim 15, wherein the true efficiency of the intermediate-pressure section comprises the true efficiency of an intermediate-pressure section of an opposed flow steam turbine. 17. The system of claim 13, wherein the first, second, and third mid-casing packing leakage flow rate percentages are approximately equal to an actual mid-casing packing leakage flow rate percentage when the linear relationship indicates the first, second, and third mid-casing packing leakage flow rate percentages are substantially constant between the first, second, and third operating points. 18. The system of claim 13, wherein the steam turbine controller, when in operation, determines an initial value of the assumed efficiency of the intermediate-pressure section by adjusting the third apparent efficiency of the intermediate-pressure section based on the third estimated enthalpy of mid-casing packing leakage from the high-pressure section to the intermediate-pressure section. 19. The system of claim 13, wherein the steam turbine controller, when in operation, estimates the first, second, and third enthalpies of mid-casing packing leakage from the high-pressure section to the intermediate-pressure section using an enthalpy-drop expansion line based on test data and/or a steam turbine manufacturer's estimating method.
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