IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0529626
(2006-09-29)
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등록번호 |
US-7434403
(2008-10-14)
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우선권정보 |
CH-0556/04(2004-03-31) |
발명자
/ 주소 |
- Brautsch,Andreas
- Queloz,Patrick
- Socher,Bernd
- Van Straaten,Floris M. Azn.
|
출원인 / 주소 |
|
대리인 / 주소 |
Buchanan Ingersoll & Rooney PC
|
인용정보 |
피인용 횟수 :
1 인용 특허 :
6 |
초록
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A method of operating a thermal power plant, such as a gas turbine power plant, in which a rotary unit, such as at least one gas turbine stage, is driven by burning gaseous fuel inside a combustion chamber, with hot gases being formed, the rotary energy of which rotary unit is converted into another
A method of operating a thermal power plant, such as a gas turbine power plant, in which a rotary unit, such as at least one gas turbine stage, is driven by burning gaseous fuel inside a combustion chamber, with hot gases being formed, the rotary energy of which rotary unit is converted into another form of energy, such as into electrical energy. A load set point (L) of the thermal power plant is set by regulating the quantity of gaseous fuel fed to the combustion process. The thermal power plant is operated at a load set point (L), provided the gaseous fuel is fed to the combustion process through a gas line at a gas pressure pgas, with description="In-line Formulae" end="lead"pgas>paction limit(L),description="In-line Formulae" end="tail" where paction limit(L) represents a pressure value which depends at least on the load set point (L) of the thermal power plant.
대표청구항
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What is claimed is: 1. A method of operating a thermal power plant in which a rotary unit is driven by burning gaseous fuel inside a combustion chamber where hot gases are formed, and the rotary energy of the rotary unit is converted into another form of energy that defines a load set point (L) of
What is claimed is: 1. A method of operating a thermal power plant in which a rotary unit is driven by burning gaseous fuel inside a combustion chamber where hot gases are formed, and the rotary energy of the rotary unit is converted into another form of energy that defines a load set point (L) of the thermal power plant, the load set point (L) being set by regulating the quantity of gaseous fuel fed to the combustion process, wherein the thermal power plant is operated at the load set point (L), provided the gaseous fuel is fed to the combustion process through a gas line at a gas pressure description="In-line Formulae" end="lead"pgas>paction limit (L),description="In-line Formulae" end="tail" wherein paction limit (L) represents a pressure value which depends at least on the load set point (L) of the thermal power plant, wherein, when the gas pressure pgas drops to the pressure value Paction limit (L), at least one of the following measures is initiated: throttling of cooling of combustion air forming an air component in a fuel/air mixture burnt in the combustion chamber; throttling of steam admixed to the fuel/air mixture; and/or throttling of cooling of the steam admixed to the fuel/air mixture, wherein for the case in which one or more of the above measures have been completely shut off, and stabilization of or increase in the gas pressure pgas is not achieved, a temperature of the gaseous fuel fed to the combustion process is reduced, and for the case in which the reduction in the fuel temperature does not lead to the stabilization of or increase in the gas pressure, a controlled deloading of the thermal power plant is initiated. 2. The method as claimed in claim 1, wherein, if the gas pressure pgas drops below the pressure value paction limit(L0) at an initial load set point (L0), the controlled deloading of the thermal power plant is carried out by standard deloading wherein standard deloading comprises reducing the quantity of gaseous fuel fed to the combustion process, wherein, depending on a pressure ratio between Pgas and Paction limit(L) during deloading, either i) the standard deloading is ended and the thermal power plant is changed to its initial load set point; ii) complete emergency load shedding is carried out, during which the fuel reduction is carried out more rapidly than during the standard deloading; or iii) the fuel supply is changed over to another type of fuel. 3. The method as claimed in claim 2, wherein, for the case where standard deloading results in pgas equaling psafety margin(L1) at a reduced load set point L1, while: description="In-line Formulae" end="lead"psafety margin(L1)>paction limit(L1),description="In-line Formulae" end="tail" the standard load relief is ended and the thermal power plant is changed to the initial load set point (L0) by increasing the fuel feed. 4. The method as claimed in claim 3, wherein the thermal power plant is changed to the initial load set point L0 by step-by-step increases in the load set point (L) starting from the point where Pgas≧Ploading hysteresis such that Ploading hysteresis>Paction limit, including the steps of: a) increasing load until a load setpoint is reached where Pgas=Psafety margin, b) maintaining new load setpoint until Pgas=Ploading hysteresis, c) repeating steps a) and b) until the initial load set point L0 is reached. 5. The method as claimed in claim 2, wherein, for the case where initially pgas=Paction limit(L0), and the standard deloading leads to a drop in the gas pressure pgas to a pressure value pprotection limit (L2) at a reduced load set point L2, wherein Psystem requirement(L2)protection limit(L2)action limit(L2), wherein psystem requirement(L2) is a system internal pressure set in a region of the combustion chamber of the reduced load set point (L2) of the thermal power plant, the complete emergency load shedding or the changeover of the fuel feed to another type of fuel is effected. 6. The method as claimed in claim 5, wherein a standard deload relief is carried out by throttling the fuel feed at a throttle rate r1, and wherein the emergency load relief is carried out at a throttle rate r2, wherein r2≧6��r1. 7. The method as claimed in claim 6, wherein the thermal power plant is changed to the initial load set point L0 once the load set point set at pgas=psafety margin(L) has stabilized. 8. The method as claimed in claim 7, wherein the thermal power plant is loaded to the initial load set point L0 according to a standard load build-up, provided that: description="In-line Formulae" end="lead"pgas>ploading hysteresis anddescription="In-line Formulae" end="tail" description="In-line Formulae" end="lead"ploading hysteresis>paction limit.description="In-line Formulae" end="tail" 9. The method as claimed in claim 2, wherein a standard deload relief is carried out by throttling the fuel feed at a throttle rate r1, and wherein the emergency load relief is carried out at a throttle rate r2, wherein r2≧6��r1. 10. The method as claimed in claim 9, wherein, in cases where: the gas pressure pgas repeatedly drops to a pressure value paction limit(L) after psafety margin(L) is reached; at least one of the measures i), ii) and/or iii) of claim 2 is carried out repeatedly; and the gas pressure pgas falls below a minimum pressure value pmin, either the complete emergency load relief is effected or the fuel supply is changed over to another type of fuel. 11. The method as claimed in claim 9, wherein the thermal power plant is changed to the initial load set point L0 once the load set point set at pgas=psafety margin(L) has stabilized. 12. The method as claimed in claim 11, wherein the thermal power plant is changed to the initial load set point L0 according to a standard load build-up, provided: description="In-line Formulae" end="lead"pgas≧ploading hysteresis anddescription="In-line Formulae" end="tail" description="In-line Formulae" end="lead"ploading hysteresis>paction limit, anddescription="In-line Formulae" end="tail" wherein the standard load build-up is carried out at a fuel feed rate depending on the respective thermal power plant. 13. The method as claimed in claim 12, wherein the thermal power plant is changed to the initial load set point L0 by step-by-step increases in the load set point (L) starting from the point where Pgas≧Ploading hysteresis such that Ploading hysteresis>Paction limit, including the steps of: a) increasing load until a load setpoint is reached where pgas=psafety margin, b) maintaining new load setpoint until Pgas=Ploading hysteresis, c) repeating steps a) and b) until the initial load set point L0 is reached. 14. The method of claim 12, wherein the standard load build-up is carried out at a fuel feed rate which is constant with respect to time. 15. The method as claimed in claim 2, wherein the thermal power plant is changed to the initial load set point L0 once the load set point set at pgas=psafety margin(L) has stabilized. 16. The method as claimed in claim 2, wherein the thermal power plant is loaded to the initial load set point L0 according to a standard load build-up, provided that: description="In-line Formulae" end="lead"pgas≧ploading hysteresis anddescription="In-line Formulae" end="tail" description="In-line Formulae" end="lead"ploading hysteresis>paction limit.description="In-line Formulae" end="tail" 17. The method of claim 16, wherein the standard load build-up is carried out at a fuel feed rate which is constant with respect to time. 18. The method of claim 1, wherein the thermal power plant is a gas turbine power plant having a gas turbine stage for converting rotary energy into electrical energy.
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