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 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 on a system internal pressure psystem requirement (L) set in the region of the combustion chamber by the load set point (L) of the thermal power plant, with description="In-line Formulae" end="lead"paction limit(L)>psystem requirement(L).description="In-line Formulae" end="tail"
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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, with hot gases being formed, the rotary energy of which rotary unit is converted into another form of energy, and describes a load set point (L) o
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, with hot gases being formed, the rotary energy of which rotary unit is converted into another form of energy, and describes 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 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 on a system internal pressure psystem requirement (L) set in the region of the combustion chamber by the load set point (L) of the thermal power plant, with description="In-line Formulae" end="lead"paction limit(L)>psystem requirement (L),description="In-line Formulae" end="tail" wherein, starting from an initial load set point L0, during a pressure loss in the gas line, as a result of which the gas pressure pgas drops to the pressure value paction limit (L0), standard deloading is carried out by reducing the quantity of gaseous fuel fed to the combustion process, and wherein, depending on a pressure ratio between pgas and paction limit (L) forming during reduction of the load, on the basis of a decision criterion, one of the following steps is performed: i) the standard deloading is ended and the thermal power plant is changed to its initial load set point, or 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. 2. The method as claimed in claim 1, wherein, for the case pgas=paction limit (L0), the standard deloading leads to a gas pressure pgas which assumes a pressure value psafety margin (L1) at a reduced load set point L1, for which: 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. 3. The method as claimed in claim 2, wherein, in cases where the gas pressure pgas repeatedly drops to a pressure value paction limit (L) after psafety margin (L) is reached, the measure described in claim 2 is repeated, and wherein, in the case where the above measure is carried out repeatedly, 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. 4. The method as claimed in claim 2, wherein the thermal power plant is changed to the initial load set point L0 by step-by-step increase in the load set point (L) in such a way that, in the case where pgas≧ploading hysteresis (L4), with ploading hysteresis (L4)action limit (L4), a load build-up of the thermal power plant is carried out at a load set point L4 until pgas corresponds to the pressure value psafety margin (L3) at a higher load set point L3, and if pgas furthermore increases at the uniform load set point L3 and reaches the pressure value ploading hysteresis (L3), the above load build-up is repeated until the initial load set point L0 is reached. 5. The method as claimed in claim 2, wherein the standard load 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, with r2≧6��r1. 6. The method as claimed in claim 5, 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. 7. The method as claimed in claim 6, 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. 8. The method as claimed in claim 7, wherein the thermal power plant is changed to the initial load set point L0 by step-by-step increase in the load set point (L) in such a way that, in the case where pgas≧ploading hysteresis (L4), with ploading hysteresis (L4)>paction limit (L4), a load build-up of the thermal power plant is carried out at a load set point L4 until pgas corresponds to the pressure value psafety margin (L3) at a higher load set point L3, and if pgas furthermore increases at the uniform load set point L3 and reaches the pressure value ploading hysteresis (L3), the above load build-up is repeated until the initial load set point L0 is reached. 9. The method of claim 7, wherein the standard load build-up is carried out at a fuel feed rate which is constant with respect to time. 10. The method as claimed in claim 1, wherein, for the case pgas=paction limit (L0), 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, with psystem requirement (L2)protection limit (L2)action limit (L2), the complete emergency load shedding or the changeover of the fuel feed to another type of fuel is effected. 11. The method as claimed in claim 1, wherein the standard load 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, with r2≧6��r1. 12. The method as claimed in claim 1, 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. 13. The method as claimed in claim 1, 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. 14. The method of claim 13, wherein the standard load build-up is carried out at a fuel feed rate which is constant with respect to time. 15. 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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이 특허에 인용된 특허 (6)
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