CN210217926U - System for adjusting part load efficiency of combined cycle unit - Google Patents
System for adjusting part load efficiency of combined cycle unit Download PDFInfo
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- CN210217926U CN210217926U CN201921210551.5U CN201921210551U CN210217926U CN 210217926 U CN210217926 U CN 210217926U CN 201921210551 U CN201921210551 U CN 201921210551U CN 210217926 U CN210217926 U CN 210217926U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
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Abstract
The utility model relates to a combined cycle power plant technical field especially relates to a combined cycle unit part load efficiency's governing system, including compressor, combustion chamber and the turbine that connects gradually, the combustion chamber is equipped with the fuel valve of control charge-in volume, and the compressor is equipped with compressor export pressure measurement station, the adjustable import stator of aperture and leads to the exhaust tube of the air intake chamber of turbine, is equipped with cooling air temperature measurement station and governing valve on the exhaust tube, and the turbine is equipped with turbine export temperature measurement station and turbine air intake chamber pressure measurement station; and the inlet guide vane, the fuel valve, the regulating valve, the cooling air temperature measuring point, the turbine outlet temperature measuring point, the compressor outlet pressure measuring point and the turbine inlet chamber pressure measuring point are connected with the control module. The opening degrees of the inlet guide vane and the fuel valve can be adjusted according to the output target signal under the partial load, the inlet temperature of the turbine is increased, namely the outlet temperature of the turbine is increased, and the combined cycle efficiency under the partial load can be improved.
Description
Technical Field
The utility model relates to a combined cycle power station technical field especially relates to an governing system of combined cycle unit partial load efficiency.
Background
In a combined cycle power plant, the gas turbine is mainly used as a peak shaving unit and is operated under partial load working conditions most of the time. The partial load operation of the gas turbine is of great importance for the power plant, since it is directly related not only to the performance parameters of the gas turbine itself, but also to the operating parameters of the turbine and the economics of the operation of the entire power plant. Therefore, how to improve the performance of gas turbines and combined cycle units at part load is a major concern for the owners.
The gas turbine control method adopted by the existing combined cycle unit generally keeps the temperature of the turbine outlet basically unchanged, and the adoption of the control method causes the unit to operate for a long time under the partial load working condition and has low efficiency. Some manufacturers also regulate part-load conditions by directly extracting compressor air, and the use of this method will reduce the efficiency of the combined cycle.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a combined cycle unit partial load efficiency's governing system can promote the combined cycle efficiency under the partial load to overcome prior art's above-mentioned defect.
In order to solve the technical problem, the utility model discloses a following technical scheme:
a combined cycle unit part load efficiency regulating system comprises a gas compressor, a combustion chamber and a turbine which are sequentially connected, wherein the combustion chamber is provided with a fuel valve for controlling the feeding amount, the gas compressor is provided with a gas compressor outlet pressure measuring point, an inlet guide vane with adjustable opening degree and an air extraction pipeline leading to an air inlet cavity of the turbine, the air extraction pipeline is provided with a cooling air temperature measuring point and a regulating valve, and the turbine is provided with a turbine outlet temperature measuring point and a turbine air inlet cavity pressure measuring point; and the inlet guide vane, the fuel valve, the regulating valve, the cooling air temperature measuring point, the turbine outlet temperature measuring point, the compressor outlet pressure measuring point and the turbine inlet chamber pressure measuring point are connected with the control module.
Preferably, the turbine is also provided with a turbine rotating and static chamber temperature measuring point, and the turbine rotating and static chamber temperature measuring point is connected with the control module.
Preferably, the compressor is provided with a plurality of air extraction pipelines which are respectively communicated with different turbine stages of the turbine, and each air extraction pipeline is provided with a cooling air temperature measuring point and an adjusting valve.
Preferably, the turbine is provided with a plurality of air inlet chambers, the air inlet chambers are communicated with the air pumping pipelines in a one-to-one correspondence mode, and a turbine air inlet chamber pressure measuring point is arranged in each air inlet chamber.
Preferably, the waste heat boiler is provided with a steam generation system, an outlet of the steam generation system is connected with an inlet of the steam turbine, an outlet of the steam turbine is connected with an inlet of the condenser, and an outlet of the condenser is connected with an inlet of the steam generation system.
The utility model also provides a method for adjusting combined cycle unit part load efficiency adopts as above combined cycle unit part load efficiency's governing system, including following step: step one, the combined cycle unit operates under the partial load working condition, and when the partial load is more than or equal to 90% of the basic load, the temperature of a turbine outlet of the gas turbine is kept unchanged; when the partial load is less than 90% of the basic load, the next step II is carried out; secondly, adjusting the proportion of the fuel quantity to the air quantity in the combustion chamber according to the output target signal of the combined cycle unit under the partial load working condition, so as to improve the temperature of the turbine inlet; obtaining the optimal cooling air quantity according to the temperature of the turbine inlet, the temperature of cooling air sent into a turbine air inlet chamber by an air extraction pipeline on the air compressor and the set tolerance temperature of the turbine blade; and step four, obtaining an optimal set point according to the optimal cooling air quantity, and adjusting the opening of an adjusting valve on an air extraction pipeline to enable the ratio of the pressure of the turbine air inlet cavity to the pressure of the outlet of the air compressor to reach the optimal set point.
Preferably, in the second step, the adjustment of the ratio of the fuel quantity to the air quantity in the combustion chamber is realized by adjusting the opening degree of the inlet guide vane of the compressor and the opening degree of the fuel valve of the combustion chamber.
Preferably, in step three, the turbine outlet temperature is measured and the turbine inlet temperature is calculated from the turbine outlet temperature.
Preferably, in step three, the set withstand temperature of the turbine blade does not exceed the rated value of the temperature that the turbine blade can withstand.
Preferably, in step four, when the turbine rotor-stator chamber temperature exceeds the set value, the opening degree of the regulating valve on the air extraction pipeline is increased.
Compared with the prior art, the utility model discloses the progress that has showing:
the utility model discloses a combined cycle unit partial load efficiency's governing system can realize promoting turbine inlet temperature through adjusting the aperture of import stator and the aperture of fuel valve according to the target of exerting oneself of combined cycle unit when the combined cycle unit moves under the partial load operating mode, namely realizes promoting turbine outlet temperature, promotes the efficiency that turbine outlet temperature can promote the combined cycle unit, realizes promoting the mesh of combined cycle efficiency under the partial load from this; meanwhile, the opening of the regulating valve on the exhaust pipe is regulated according to the turbine outlet temperature measured by the turbine outlet temperature measuring point, the cooling air temperature measured by the cooling air temperature measuring point, the compressor outlet pressure measured by the compressor outlet pressure measuring point and the turbine inlet chamber pressure measured by the turbine inlet chamber pressure measuring point, so that the amount of cooling air fed into the turbine inlet chamber can be controlled, the temperature actually borne by the turbine blade does not exceed the rated value of the temperature borne by the turbine blade, the temperature borne by the turbine blade is ensured not to be too high, and the integrity of the turbine blade is ensured; in addition, the air quantity entering the combustion chamber for combustion can be adjusted through adjusting the opening of the adjusting valve, so that the combustion temperature range can be adjusted, the emission is reduced, and the combustion stability is adjusted.
Drawings
Fig. 1 is a schematic structural diagram of a system for adjusting the partial load efficiency of a combined cycle unit according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a partial load adjustment strategy in the method for adjusting the partial load efficiency of the combined cycle unit according to the embodiment of the present invention.
Fig. 3 is a schematic diagram illustrating the adjustment of the cooling air amount in the method for adjusting the part load efficiency of the combined cycle plant according to the embodiment of the present invention.
Fig. 4 is a schematic diagram of a control strategy of a set point of a regulating valve in a regulating method of partial load efficiency of a combined cycle unit according to an embodiment of the present invention.
Wherein the reference numerals are as follows:
1. compressor 11, inlet guide vane
2. Combustion chamber 21, fuel valve
3. Turbine 4, air extraction line
41. Regulating valve 5 and waste heat boiler
51. Steam generation system 6, steam turbine
7. Condenser P1, compressor outlet pressure measuring point
P2, turbine inlet chamber pressure measuring point T1 and cooling air temperature measuring point
T2, turbine outlet temperature measuring point T3, turbine rotor chamber temperature measuring point
Detailed Description
The following describes the present invention in further detail with reference to the accompanying drawings. These embodiments are provided only for illustrating the present invention and are not intended to limit the present invention.
In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
As shown in fig. 1 to 4, an embodiment of the present invention provides a system for adjusting a part load efficiency of a combined cycle unit.
Referring to fig. 1, the system for adjusting the partial load efficiency of the combined cycle unit in the embodiment includes a compressor 1, a combustion chamber 2 and a turbine 3, which are connected in sequence, air enters the compressor 1 from an inlet of the compressor 1, is compressed in the compressor 1 and then is output from an outlet of the compressor 1 and sent to the combustion chamber 2, the air entering the combustion chamber 2 is mixed and combusted with fuel input from a feed inlet of the combustion chamber 2, combustion gas generated by combustion is output from an outlet of the combustion chamber 2 and sent to the turbine 3, and the combustion gas enters a static cavity of the turbine 3 from an inlet of the turbine 3 and acts on turbine blades and then is discharged from an outlet of the turbine 3. The air compressor 1 is provided with an air extraction pipeline 4 leading to the turbine 3, the turbine 3 is provided with an air inlet chamber communicated with the air extraction pipeline 4, and the air extraction pipeline 4 pumps air in the air compressor 1 into the turbine 3 to be used as cooling air to cool the turbine blades.
In the present embodiment, the combustion chamber 2 is preferably an annular combustion chamber. The combustion chamber 2 is provided with a fuel valve 21 for controlling the feeding amount, the fuel valve 21 is arranged at the feeding port of the combustion chamber 2, the opening degree of the fuel valve 21 can be adjusted, and the amount of fuel fed into the combustion chamber 2 from the feeding port can be adjusted by adjusting the opening degree of the fuel valve 21.
The compressor 1 is provided with a compressor outlet pressure measuring point P1 and an inlet guide vane 11 with adjustable opening. And a compressor outlet pressure measuring point P1 is arranged at the outlet of the compressor 1 and used for measuring the compressor outlet pressure. The air flow entering the compressor 1 from the inlet of the compressor 1 can be adjusted by adjusting the opening of the inlet guide vane 11, so that the air quantity sent into the combustion chamber 2 by the compressor 1 can be adjusted. By adjusting the ratio of the amount of fuel to the amount of air entering the combustion chamber 3, the temperature of the gas generated in the combustion chamber 3 and fed to the inlet of the turbine 3, i.e. the turbine inlet temperature, can be adjusted, the turbine outlet temperature varying with the turbine inlet temperature.
The air extraction pipeline 4 is provided with a cooling air temperature measuring point T1 and an adjusting valve 41. The opening of the regulating valve 41 is adjustable, and the flow rate of the cooling air in the air extraction line 4, that is, the amount of the cooling air fed into the intake chamber of the turbine 3 can be adjusted by adjusting the opening of the regulating valve 41. The cooling air temperature measuring point T1 is used to measure the temperature of the cooling air pumped by the air suction line 4. Preferably, cooling air temperature measurement point T1 is located downstream of regulator valve 41.
The turbine 3 is provided with a turbine outlet temperature measuring point T2 and a turbine inlet chamber pressure measuring point P2. A turbine outlet temperature measurement point T2 is provided at the outlet of the turbine 3 for measuring the turbine outlet temperature. A turbine inlet chamber pressure measurement point P2 is provided in the inlet chamber of the turbine 3 for measuring the turbine inlet chamber pressure. The ratio of the turbine intake chamber pressure to the compressor outlet pressure may reflect the cooling air flow rate in the extraction line 4, and therefore, when the opening degree of the regulating valve 41 is adjusted according to the required cooling air flow rate, it may be determined whether the opening degree of the regulating valve 41 is adjusted to the opening degree corresponding to the required cooling air flow rate, by the ratio of the turbine intake chamber pressure to the compressor outlet pressure.
The inlet guide vanes 11, the fuel valve 21, the regulating valve 41, the cooling air temperature measuring point T1, the turbine outlet temperature measuring point T2, the compressor outlet pressure measuring point P1 and the turbine inlet chamber pressure measuring point P2 are all connected with the control module. The control module can adopt an existing controller, such as a PLC (programmable logic controller) or a single chip microcomputer. And a cooling air temperature signal measured by a cooling air temperature measuring point T1, a turbine outlet temperature signal measured by a turbine outlet temperature measuring point T2, a compressor outlet pressure signal measured by a compressor outlet pressure measuring point P1 and a turbine inlet chamber pressure signal measured by a turbine inlet chamber pressure measuring point P2 are all transmitted to the control module, and the control module receives the signals and controls the opening sizes of the inlet guide vane 11, the fuel valve 21 and the regulating valve 41 according to the signals.
The system for adjusting the partial load efficiency of the combined cycle unit of the embodiment can achieve the purpose of increasing the turbine inlet temperature by adjusting the opening of the inlet guide vane 11 and the opening of the fuel valve 21 according to the output target of the combined cycle unit when the combined cycle unit operates under the partial load working condition, namely, the turbine outlet temperature is increased, and the efficiency of the combined cycle unit can be increased by increasing the turbine outlet temperature, so that the purpose of increasing the combined cycle efficiency under the partial load is achieved; meanwhile, the opening degree of the regulating valve 41 on the air extraction pipeline 4 is regulated according to the turbine outlet temperature measured by a turbine outlet temperature measuring point T2, the cooling air temperature measured by a cooling air temperature measuring point T1, the compressor outlet pressure measured by a compressor outlet pressure measuring point P1 and the turbine inlet chamber pressure measured by a turbine inlet chamber pressure measuring point P2, so that the amount of cooling air sent into the turbine 3 inlet chamber can be controlled, the temperature actually born by the turbine blade does not exceed the rated value of the temperature born by the turbine blade, the temperature born by the turbine blade is ensured not to be too high, and the integrity of the turbine blade is ensured; further, the amount of air to be introduced into the combustion chamber 2 for combustion can be adjusted by adjusting the opening degree of the adjustment valve 41, so that the combustion temperature range can be adjusted, the emission can be reduced, and the combustion stability can be adjusted.
In this embodiment, preferably, the turbine 3 is further provided with a turbine rotor-stator chamber temperature measuring point T3, and the turbine rotor-stator chamber temperature measuring point T3 is provided in the rotor-stator chamber of the turbine 3, and is used for measuring the turbine rotor-stator chamber temperature. The turbine rotating and static chamber temperature measuring point T3 is connected with the control module, a turbine rotating and static chamber temperature signal measured by the turbine rotating and static chamber temperature measuring point T3 is transmitted to the control module, the control module receives the signal and controls the opening of the adjusting valve 41 according to the signal so as to ensure that the turbine rotating and static chamber temperature does not exceed a set value, and the set value is a maximum temperature value which is set according to a rated value of the turbine blade temperature and enables the turbine rotating and static chamber not to be invaded by gas, and can be obtained according to an empirical value. When the temperature of the turbine rotating and static chamber measured by the turbine rotating and static chamber temperature measuring point T3 exceeds the set value, the control module preferentially controls the opening of the regulating valve 41 to increase according to a turbine rotating and static chamber temperature signal measured by the turbine rotating and static chamber temperature measuring point T3 so as to increase the amount of cooling air sent into the air inlet chamber of the turbine 3, prevent the invasion of gas and ensure the safety of turbine blades.
In this embodiment, preferably, the compressor 1 is provided with a plurality of extraction lines 4, the plurality of extraction lines 4 respectively lead to different turbine stages of the turbine 3, and each extraction line 4 is provided with a cooling air temperature measuring point T1 and a regulating valve 41. Further, the turbine 3 is provided with a plurality of air inlet chambers which are communicated with the plurality of air extraction pipelines 4 in a one-to-one correspondence manner, and each air inlet chamber is internally provided with a turbine air inlet chamber pressure measuring point P2. The control module carries out independent adjustment control on the opening of the regulating valve 41 on each air extraction pipeline 4 according to a turbine outlet temperature signal measured by a turbine outlet temperature measuring point T2, a compressor outlet pressure signal measured by a compressor outlet pressure measuring point P1, a cooling air temperature signal measured by each cooling air temperature measuring point T1 and a turbine air inlet cavity pressure signal measured by each turbine air inlet cavity pressure measuring point P2, and the opening adjustment control strategies of the regulating valve 41 on each air extraction pipeline 4 are different according to the difference of the optimal cooling air quantity of each turbine blade. Therefore, according to the actual application requirements, on the premise of ensuring the integrity of the turbine blades, the opening degree of the regulating valve 41 on each air extraction pipeline 4 is differentially regulated, the amount of cooling air entering each turbine-stage blade is controlled according to the service life requirement of the blade, and the aims of prolonging the worst blade overhaul interval, reducing the maintenance cost and prolonging the service life of the blade are fulfilled.
In this embodiment, the compressor outlet pressure measurement point P1 may be a pressure sensor disposed at the outlet of the compressor 1, the turbine inlet chamber pressure measurement point P2 may be a pressure sensor disposed in the inlet chamber of the turbine 3, the cooling air temperature measurement point T1 may be a temperature sensor disposed on the air extraction pipe 4, the turbine outlet temperature measurement point T2 may be a temperature sensor disposed at the outlet of the turbine 3, and the turbine rotor chamber temperature measurement point T3 may be a temperature sensor disposed in the rotor chamber of the turbine 3.
The system for adjusting the partial load efficiency of the combined cycle unit further comprises a waste heat boiler 5, a steam turbine 6 and a condenser 7, wherein the waste heat boiler 5 is provided with a steam generation system 51, an outlet of the turbine 3 is communicated with the waste heat boiler 5, and fuel gas discharged from an outlet of the turbine 3 is introduced into the waste heat boiler 5 to provide heat for the steam generation system 51 of the waste heat boiler 5. An outlet of the steam generation system 51 is connected to an inlet of the steam turbine 6, an outlet of the steam turbine 6 is connected to an inlet of the condenser 7, and an outlet of the condenser 7 is connected to an inlet of the steam generation system 51. Feed water entering from an inlet of the steam generation system 51 is discharged from an outlet of the turbine 3 and is introduced into the exhaust-heat boiler 5 for heat exchange to form steam, the steam is output from an outlet of the steam generation system 51 and is sent into the turbine 6 for doing work, the steam is discharged from an outlet of the turbine 6 after doing work and is sent into the condenser 7 to be condensed into feed water, and then the feed water is sent into the steam generation system 51 for heating, so that the gas-steam combined cycle is realized. Because the regulating system of the partial load efficiency of the combined cycle unit of the embodiment improves the turbine inlet temperature under the partial load working condition, namely improves the turbine outlet temperature, in order to adapt to the improved turbine outlet temperature, the air inlet parameter of the waste heat boiler 5 is allowed to exceed the rated air inlet parameter for long-term stable operation, and the air inlet parameter of the steam turbine 6 is allowed to exceed the rated air inlet parameter for long-term stable operation.
Based on above-mentioned combined cycle unit partial load efficiency's governing system, the embodiment of the utility model provides a still provides a combined cycle unit partial load efficiency's adjusting method. The method for adjusting the partial load efficiency of the combined cycle unit in the embodiment is performed by adopting the system for adjusting the partial load efficiency of the combined cycle unit in the embodiment, and comprises the following steps:
step one, according to the peak regulation requirement of a power grid, a combined cycle unit operates under the working condition of partial load, and when the partial load is more than or equal to 90% of basic load, the temperature of a turbine outlet of a gas turbine is kept unchanged; and when the partial load is less than 90% of the basic load, the next step two is carried out.
And step two, adjusting the proportion of the fuel quantity to the air quantity in the combustion chamber 2 according to the output target signal of the combined cycle unit under the partial load working condition, so that the temperature of the turbine inlet is increased. Preferably, the adjustment of the ratio of the fuel quantity to the air quantity in the combustion chamber 2 is achieved by adjusting the opening of the inlet guide vanes 11 of the compressor 1 and the opening of the fuel valves 21 of the combustion chamber 2. Referring to fig. 2, in the present embodiment, a target output signal of the combined cycle plant under a partial load condition is read by the control module, and the control module controls the opening degree of the inlet guide vane 11 of the compressor 1 to decrease and controls the opening degree of the fuel valve 21 of the combustion chamber 2 to increase according to the target output signal, so as to increase the fuel-air ratio (the ratio of the fuel amount to the air amount) in the combustion chamber 2, and thus increase the turbine inlet temperature.
And step three, obtaining the optimal cooling air quantity according to the inlet temperature of the turbine, the temperature of the cooling air sent into the turbine air inlet chamber by the air extraction pipeline 4 on the air compressor and the set tolerance temperature of the turbine blade. Preferably, the turbine outlet temperature is measured and the turbine inlet temperature is calculated from the turbine outlet temperature.
Referring to fig. 3, there is a curve relationship between the cooling air amount mc of the turbine blade and the equation (Tg-Tw)/(Tg-Tc), where Tg is the turbine inlet temperature, Tc is the cooling air temperature, and Tw is the turbine blade tolerance temperature, and the curve relationship is an empirical relationship obtained from the tolerance temperatures Tw of different turbine blades in practical use and their corresponding turbine inlet temperatures Tg, cooling air temperatures Tc, and cooling air amounts mc. In this embodiment, the turbine outlet temperature is measured by the turbine outlet temperature measuring point T2, the turbine inlet temperature Tg is calculated according to the turbine outlet temperature, the cooling air temperature Tc is measured by the cooling air temperature measuring point T1, the set tolerance temperature Tw ' of the turbine blade is taken, Tg, Tc, and Tw ' are substituted into the formula (Tg-Tw)/(Tg-Tc), and the corresponding cooling air amount mc, that is, the optimal cooling air amount corresponding to the set tolerance temperature Tw ' of the turbine blade, can be obtained according to the curve relationship shown in fig. 3. Preferably, the set temperature Tw' of the turbine blade does not exceed a rated value of the temperature which the turbine blade can withstand, in order to ensure that the maximum temperature of the turbine blade can be met by the optimum amount of cooling air obtained. In this embodiment, the optimal cooling air amount can be obtained by the control module automatically calculating the turbine outlet temperature signal measured by the turbine outlet temperature measuring point T2, the cooling air temperature signal measured by the cooling air temperature measuring point T1, the set tolerance temperature of the turbine blade, and the curve relationship shown in fig. 3.
And step four, obtaining an optimal set point according to the optimal cooling air quantity, wherein the set point refers to a pressure ratio value of a turbine air inlet chamber and an outlet of the compressor, namely a ratio value of the pressure of the turbine air inlet chamber to the pressure of the outlet of the compressor, and the pressure ratio value is determined by the opening degree of the regulating valve 41 on the air extraction pipeline 4, so that the set point is the set point of the regulating valve 41. Since the ratio of the turbine inlet chamber pressure to the compressor outlet pressure reflects the cooling air flow in the extraction line 4, the optimum cooling air flow corresponds to the optimum set point. And adjusting the opening of the adjusting valve 41 on the air extraction pipeline 4 to enable the ratio of the pressure of the turbine air inlet cavity to the pressure of the outlet of the compressor to reach an optimal set point. Referring to fig. 4, in the present embodiment, the control module adjusts the opening of the adjusting valve 41 on the extraction pipeline 4 according to the optimal set point determined by the turbine inlet temperature, the turbine inlet chamber pressure signal measured by the turbine inlet chamber pressure measuring point P2, and the compressor outlet pressure signal (the pressure ratio of the turbine inlet chamber to the compressor outlet) measured by the compressor outlet pressure measuring point P1 until the ratio of the turbine inlet chamber pressure to the compressor outlet pressure reaches the optimal set point.
Therefore, the method for adjusting the partial load efficiency of the combined cycle unit in the embodiment enables the combined cycle unit to increase the turbine inlet temperature when the combined cycle unit operates under the partial load working condition, namely, the turbine outlet temperature is increased, and the efficiency of the combined cycle unit can be improved by increasing the turbine outlet temperature, so that the purpose of improving the combined cycle efficiency under the partial load is achieved; meanwhile, the opening of the regulating valve 41 on the air extraction pipeline 4 is regulated, and the amount of cooling air sent into the air inlet chamber of the turbine 3 is controlled, so that the temperature actually borne by the turbine blade does not exceed the rated value of the temperature borne by the turbine blade, the temperature borne by the turbine blade is ensured not to be too high, and the integrity of the turbine blade is ensured; further, the amount of air to be introduced into the combustion chamber 2 for combustion can be adjusted by adjusting the opening degree of the adjustment valve 41, so that the combustion temperature range can be adjusted, the emission can be reduced, and the combustion stability can be adjusted.
Preferably, in the fourth step, when the temperature of the turbine rotary-static chamber exceeds a set value, the opening degree of the regulating valve 41 on the air extraction pipeline 4 is increased to ensure that the temperature of the turbine rotary-static chamber does not exceed the set value, and the set value is a maximum temperature value which is set according to a rated value of the bearable temperature of the turbine blade and enables the turbine rotary-static chamber not to be invaded by gas, and can be obtained according to an empirical value. In this embodiment, when the temperature of the turbine rotating and static chamber measured by the turbine rotating and static chamber temperature measuring point T3 exceeds the set value, the control module preferentially controls the opening of the regulating valve 41 to increase according to the temperature signal of the turbine rotating and static chamber measured by the turbine rotating and static chamber temperature measuring point T3, so as to increase the amount of cooling air sent into the intake chamber of the turbine 3, prevent the invasion of the gas, and ensure the safety of the turbine blade.
Preferably, when the compressor 1 is provided with a plurality of extraction pipelines 4 respectively leading to different turbine stages of the turbine 3, in the fourth step, differential adjustment can be performed on the opening of the regulating valve 41 on each extraction pipeline 4 on the premise of ensuring the integrity of the turbine blades according to the actual application requirements, and the amount of cooling air entering each turbine stage blade is controlled according to the service life requirements of the blade, so that the aims of prolonging the overhaul interval of the worst blades, reducing the maintenance cost and prolonging the service life of the blades are fulfilled. Fig. 4 is a schematic diagram showing only a point control strategy for the regulating valve 41, and in practical applications, the opening degree regulating control strategy for the regulating valve 41 on each extraction line 4 differs depending on the optimum cooling air amount for each turbine stage blade.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and replacements can be made without departing from the technical principle of the present invention, and these modifications and replacements should also be regarded as the protection scope of the present invention.
Claims (5)
1. The system for adjusting the partial load efficiency of the combined cycle unit is characterized by comprising a gas compressor, a combustion chamber and a turbine which are sequentially connected, wherein the combustion chamber is provided with a fuel valve for controlling the feeding amount, the gas compressor is provided with a gas compressor outlet pressure measuring point, an inlet guide vane with adjustable opening and an air extraction pipeline leading to an air inlet cavity of the turbine, the air extraction pipeline is provided with a cooling air temperature measuring point and an adjusting valve, and the turbine is provided with a turbine outlet temperature measuring point and a turbine air inlet cavity pressure measuring point; the inlet guide vane, the fuel valve, the regulating valve, the cooling air temperature measuring point, the turbine outlet temperature measuring point, the compressor outlet pressure measuring point and the turbine inlet chamber pressure measuring point are all connected with a control module.
2. The system for regulating the fractional load efficiency of a combined cycle plant of claim 1, wherein said turbine is further provided with a turbine rotary static chamber temperature measurement point, said turbine rotary static chamber temperature measurement point being connected to said control module.
3. The system for regulating the fractional load efficiency of a combined cycle plant according to claim 1, wherein said compressor is provided with a plurality of said extraction lines leading to different turbine stages of said turbine, respectively, each of said extraction lines being provided with said cooling air temperature measurement point and said regulating valve.
4. The system for regulating the fractional load efficiency of a combined cycle plant of claim 3, wherein said turbine is provided with a plurality of said intake chambers, said intake chambers being in one-to-one communication with said extraction lines, each of said intake chambers being provided with a pressure measurement point for said turbine intake chamber.
5. The system for regulating the partial load efficiency of the combined cycle unit according to claim 1, further comprising a waste heat boiler, a steam turbine and a condenser, wherein an outlet of the turbine is communicated with the waste heat boiler, the waste heat boiler is provided with a steam generation system, an outlet of the steam generation system is connected with an inlet of the steam turbine, an outlet of the steam turbine is connected with an inlet of the condenser, and an outlet of the condenser is connected with an inlet of the steam generation system.
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| CN201921210551.5U CN210217926U (en) | 2019-07-29 | 2019-07-29 | System for adjusting part load efficiency of combined cycle unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110296001A (en) * | 2019-07-29 | 2019-10-01 | 上海电气燃气轮机有限公司 | The regulating system and method for combined cycle unit part-load efficiency |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110296001A (en) * | 2019-07-29 | 2019-10-01 | 上海电气燃气轮机有限公司 | The regulating system and method for combined cycle unit part-load efficiency |
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