IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
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| 국제특허분류(IPC7판) |
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| 출원번호 |
US-0104583
(2011-05-10)
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| 등록번호 |
US-8342009
(2013-01-01)
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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 :
50 |
초록
▼
A method of more accurately measuring steam turbine efficiency is disclosed in which the sealing steam in the steam turbine is re-routed so that a more accurate measure of steam turbine efficiency can be made. Some of the steam entering a turbine goes into the turbine's end pack and then mixes with
A method of more accurately measuring steam turbine efficiency is disclosed in which the sealing steam in the steam turbine is re-routed so that a more accurate measure of steam turbine efficiency can be made. Some of the steam entering a turbine goes into the turbine's end pack and then mixes with the steam that goes through the turbine. Piping is added from one of the end pack line's to the condenser. This added line has a valve, pressure, temperature and flow measuring devices. As the valve is opened, the amount of flow going to the end pack line allowing the end pack steam mix with the steam that goes through the turbine is reduced. As the flow in this line is reduced the measured temperature at the turbine exhaust will also decrease. The amount that the valve is opened is increased until either the exhaust temperature has reached a minimum, or the enthalpy in the pipe changes from the initial enthalpy.
대표청구항
▼
1. A method of measuring the efficiency of a steam turbine in which steam from a high pressure end packing of the turbine is routed between the inner and outer shells of the turbine to provide sealing steam to a low pressure end packing of the turbine and then returned to a main steam flow after the
1. A method of measuring the efficiency of a steam turbine in which steam from a high pressure end packing of the turbine is routed between the inner and outer shells of the turbine to provide sealing steam to a low pressure end packing of the turbine and then returned to a main steam flow after the last stage of the steam turbine before the pressure and temperature of the main steam flow is measured, the method comprising the step of temporarily re-routing the sealing steam to a steam condenser so that the efficiency of the steam turbine can be measured before the sealing steam is again returned to the main steam flow, the efficiency of the steam turbine being measured by dividing used energy by available energy. 2. The method of claim 1, wherein a high pressure end packing of the turbine includes a first line that routes a portion of the sealing steam to a point where the portion of sealing steam is mixed with the main steam that travels through the turbine and a second line running between the end packing and a steam condenser, and wherein the method further comprises the steps of adding between the second line and the condenser piping including a device to control the flow of sealing steam through the second line to the condenser, to thereby re-route a portion of sealing steam flowing through the first line to the second line and condenser so that the efficiency of the steam turbine can be measured before the sealing steam is returned to the main steam flow. 3. The method of claim 2, wherein the added piping includes a flow control valve, a pressure measuring device, temperature measuring device and a steam flow measuring device, and wherein the step of using the added piping to control the amount of sealing steam flowing through the second line, and thereby the amount of sealing steam re-routed from the first line includes opening the valve so that the amount of steam flowing through the first line is reduced so that the temperature measured at the turbine's exhaust will also decrease. 4. The method of claim 3, wherein the step of opening the valve so that the amount of steam flow through the first line is reduced is continued until either the turbine's exhaust temperature has reached a minimum temperature or the enthalpy in the added piping has changed from the initial enthalpy of the piping. 5. The method of claim 4, wherein the valve controls the amount of steam flow in the second pipe and the steam flow measuring device measures the amount of steam flow in the second pipe. 6. The method of claim 4, wherein the pressure measuring device and the temperature measuring device measure the change of enthalpy in the added piping. 7. The method of claim 4, wherein the valve is opened to an extent whereby the steam flow through the second line is large enough to cause the steam flow through the first line to reverse, such that the enthalpy in the second line is changed so as to be equal to the enthalpy of the main steam flow. 8. The method of claim 4, wherein the opening of the valve causes the high pressure end packing steam flow to be re-directed to the steam condenser. 9. The method of claim 1, wherein the efficiency of the steam turbine is measured by dividing used energy by available energy. 10. The method of claim 9, wherein used energy is defined as the enthalpy of the high pressure input steam minus the enthalpy of the main steam flow and available energy is defined as the enthalpy of the high pressure input steam minus isentropic exhaust enthalpy. 11. A method of more accurately measuring the efficiency of a steam turbine in which steam from a high pressure end packing of the turbine is routed between the inner and outer shells of the turbine to provide sealing steam to a low pressure end packing of the turbine and then returned to the main steam flow after the last stage of the steam turbine before the pressure and temperature of the main steam flow is measured, the turbine high pressure end packing including a first line that routes a portion of the sealing steam to a point where the portion of sealing steam is mixed with steam that travels through the turbine and a second line running between the end packing and a steam condenser, the method comprising the step of: using piping running between the second line and the condenser and including a flow control device to control the amount of sealing steam flowing through the second line, and thereby the amount of sealing steam flowing through the first line, to thereby re-route the sealing steam to the condenser so that the sealing steam is at least temporarily separated from the main steam flow,whereby, before the sealing steam is returned to the main steam flow, the efficiency of the steam turbine is measured by dividing used energy by available energy. 12. The method of claim 11, wherein the piping includes a valve, and wherein the step of using the piping to control the amount of sealing steam flowing through the second line, and thereby the amount of sealing steam flowing through the first line includes opening the valve so that the amount of steam flow going to the first line is reduced so that the temperature measured at the turbine's exhaust will also decrease. 13. The method of claim 12, wherein the step of opening the valve so that the amount of steam flow going to the first line is reduced is continued until either the turbine's exhaust temperature has reached a minimum temperature or the enthalpy in the added piping has changed from the initial enthalpy of the piping. 14. The method of claim 13, wherein the piping further includes a steam flow measuring device, which measures the amount of steam flow in the second pipe. 15. The method of claim 14, wherein the piping further includes a pressure measuring device and a temperature measuring device, which together measure the change of enthalpy in the piping. 16. A system for more accurately measuring the efficiency of a steam turbine in which steam from a high pressure end packing of the turbine is routed between the inner and outer shells of the turbine to provide sealing steam to a low pressure end packing of the turbine and then returned to the main steam flow after the last stage of the steam turbine before the pressure and temperature of the main steam flow is measured, the system comprising: a first line connected to the end packing that routes a portion of the sealing steam to a point where the portion of sealing steam is mixed with steam that travels through the turbine,a second line running between the end packing and a steam condenser, andpiping running between the second line and the condenser, which piping controls with a flow control device the amount of sealing steam flowing through the second line, and thereby the amount of sealing steam flowing through the first line, to thereby re-route the sealing steam to the condenser so that the sealing steam is at least temporarily separated from the main steam flow,whereby the efficiency of the steam turbine can be measured before the sealing steam again is returned to the main steam flow, andwhereby the amount of steam flow going to the first line is reduced and continued until either the turbine's exhaust temperature has reached a minimum temperature or the enthalpy in the added piping has changed from the initial enthalpy of the piping. 17. The system of claim 16, wherein before the sealing steam is returned to the main steam flow, the efficiency of the steam turbine is measured by dividing used energy by available energy. 18. The system of claim 16, wherein the piping includes a valve that is opened so that the amount of steam flow going to the first line is reduced, whereby the temperature measured at the turbine's exhaust will also decrease. 19. The system of claim 18, wherein the valve is open to a degree so that the amount of steam flow going to the first line is reduced and continued until either the turbine's exhaust temperature has reached a minimum temperature or the enthalpy in the added piping has changed from the initial enthalpy of the piping. 20. The system of claim 18, wherein the piping further includes a steam flow measuring device that measures the amount of steam flow in the second pipe. 21. The system of claim 18, wherein the piping further includes a pressure measuring device and a temperature measuring device that together measure the change of enthalpy in the piping.
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