Fuel Supply System of Gas Turbine Combustion Test Bench

Abstract

The present application proposes a fuel supply system for a gas turbine combustion test bench. Among them, the system includes a main fuel path, fuel branch paths, a purge gas circuit, a purging circuit, a venting circuit, and a gas turbine combustion test bench. The main fuel path is connected to multiple fuel branch paths, and the multiple fuel branch paths are respectively connected to their corresponding gas turbine combustion test benches. The purge gas circuit is respectively connected to the main fuel path, the multiple fuel branch paths, and the gas turbine combustion test bench. The purging circuit is connected to the gas turbine combustion test bench, and the venting circuit is respectively connected to the main fuel path and the multiple fuel branch paths. Thus, based on the multiple functional branches in the fuel supply system of the gas turbine combustion test bench, the gas turbine combustion test bench can operate stably under the operating parameters of different gas turbines, reducing the complexity of the operation of the gas turbine combustion test bench and improving the safety of the gas turbine combustion test bench.

Description

Technical Field

[0001] This application relates to the technical field of gas turbines, and particularly to a fuel supply system for a gas turbine combustion test bench. Background Art

[0002] Currently, adjusting fuel supply is an important means to change the power of a gas turbine. In order to meet indicators such as combustion stability and pollutant emissions within the full load range, in related technologies, heavy-duty gas turbines usually adopt multi-path fuel staged supply, with different loads corresponding to different fuel supply methods to ensure the stable operation of the gas turbine. However, the fuel staged supply logic is relatively complex, and there are numerous operating conditions of the gas turbine, making it difficult to ensure the stability of the gas turbine operation under different operating conditions. Therefore, there is an urgent need for a more intelligent fuel supply system for a gas turbine combustion test bench. Summary of the Invention

[0003] This application proposes a fuel supply system for a gas turbine combustion test bench.

[0004] In one aspect of the embodiments of this application, a fuel supply system for a gas turbine combustion test bench is proposed. The fuel supply system for the gas turbine combustion test bench includes a main fuel path, fuel branch paths, a purge gas circuit, a purging circuit, a venting circuit, and a gas turbine combustion test bench, where: the main fuel path is connected to a plurality of the fuel branch paths and is used to provide fuel for the plurality of fuel branch paths; the plurality of fuel branch paths are respectively connected to their corresponding gas turbine combustion test benches and are used to convey fuel to each of the gas turbine combustion test benches; the purge gas circuit is respectively connected to the main fuel path, the plurality of fuel branch paths, and the gas turbine combustion test bench and is used to displace the fuel in the transmission pipelines corresponding to the main fuel path and each of the fuel branch paths, as well as the residual fuel in the gas turbine combustion test bench; the purging circuit is connected to the gas turbine combustion test bench and is used to purge the fuel nozzles in the gas turbine combustion test bench according to the purging gas in the purging circuit; the venting circuit is respectively connected to the main fuel path and the plurality of fuel branch paths and is used to discharge the fuel in the transmission pipelines corresponding to the main fuel path and the plurality of fuel branch paths.

[0005] In an embodiment of the present application, a pressure regulating module, a first shut-off valve, an emergency shut-off valve, and a heater are installed on the transmission pipeline of the main fuel path, where: the output of the pressure regulating module is connected to the input of the first shut-off valve through the transmission pipeline to control the pressure of the fuel in the transmission pipeline of the main fuel path; the output of the first shut-off valve is connected to the input of the emergency shut-off valve through the transmission pipeline to control the start and stop of the fuel transmission to the transmission pipeline of the main fuel path; the output of the emergency shut-off valve is connected to the input of the heater through the transmission pipeline to emergently stop the transmission of the fuel in the transmission pipeline of the main fuel path; the output of the heater is connected to a plurality of the fuel branch paths through the transmission pipeline to preheat the fuel in the transmission pipeline of the main fuel path.

[0006] In an embodiment of the present application, a regulating valve and a second shut-off valve are installed on the transmission pipeline of the fuel branch path, where: the input of the regulating valve is connected to the output of the heater, and the output of the regulating valve is connected to the second shut-off valve to regulate the flow rate of the fuel in the transmission pipeline of the fuel branch path; the output of the second shut-off valve is connected to the gas turbine combustion test bench through the transmission pipeline to control the start and stop of the fuel transmission to the gas turbine combustion test bench.

[0007] In an embodiment of the present application, the purge gas circuit includes a first purge gas circuit and a second purge gas circuit, where: the output of the first purge gas circuit is connected to the output of the first shut-off valve to purge the fuel in the transmission pipelines of the main fuel path and the fuel branch paths based on low-pressure gas; the output of the second purge gas circuit is respectively connected to the output of the regulating valve and the gas turbine combustion test bench to purge the fuel in the transmission pipeline of the fuel branch path and the residual fuel of the gas turbine combustion test bench based on high-pressure gas.

[0008] In an embodiment of the present application, a third shut-off valve is installed on the transmission pipeline of the first purge gas circuit, where: the output of the third shut-off valve is connected to the output of the first shut-off valve through the transmission pipeline to control the start and stop of the transmission of the low-pressure gas to the transmission pipelines of the main fuel path and the fuel branch paths.

[0009] In an embodiment of the present application, a fourth shut-off valve and a fifth shut-off valve are installed on the transmission pipeline of the second purge gas circuit, where: the output of the fourth shut-off valve is connected to the input of the fifth shut-off valve through the transmission pipeline to control the start and stop of the transmission of the high-pressure gas to the second purge gas circuit; the output of the fifth shut-off valve is connected to the gas turbine combustion test bench through the transmission pipeline to control the start and stop of the transmission of the high-pressure gas to the gas turbine combustion test bench.

[0010] In an embodiment of the present application, a check valve is further installed on the transmission pipeline of the second replacement gas circuit, where: the check valve is installed between the output of the shut-off valve and the gas turbine combustion test bench, and is used to prevent the high-pressure gas from flowing back.

[0011] In an embodiment of the present application, a sixth shut-off valve is further installed on the transmission pipeline of the second replacement gas circuit, where: the input of the sixth shut-off valve is connected to the output of the fourth shut-off valve through a transmission pipeline, and the output of the sixth shut-off valve is connected to the output of the regulating valve through a transmission pipeline, and is used to control the start and stop of the transmission of the high-pressure gas to the transmission pipeline of the fuel branch.

[0012] In an embodiment of the present application, a pressure regulating valve and a seventh shut-off valve are installed on the purging circuit, where: the output of the pressure regulating valve is connected to the input of the seventh shut-off valve, and is used to control the start and stop of the transmission of the purging gas to the purging circuit; the seventh shut-off valve is connected to the gas turbine combustion test bench through a transmission pipeline, and is used to control the start and stop of the transmission of the purging gas to the gas turbine combustion test bench.

[0013] In an embodiment of the present application, a first relief valve and a second relief valve are installed on the transmission pipeline of the relief circuit, where: the output of the first relief valve is connected to the input of the emergency shut-off valve, and is used to relieve the fuel in the transmission pipeline of the main fuel path; the output of the second relief valve is connected to the input of the second shut-off valve, and is used to relieve the fuel in the transmission pipeline of the fuel branch.

[0014] The present application provides a fuel supply system for a gas turbine combustion test bench. Among them, the system includes a main fuel path, a fuel branch, a replacement gas circuit, a purging circuit, a relief circuit and a gas turbine combustion test bench. The main fuel path is connected to multiple fuel branches, and the multiple fuel branches are respectively connected to their corresponding gas turbine combustion test benches. The replacement gas circuit is respectively connected to the main fuel path, multiple fuel branches and the gas turbine combustion test bench. The purging circuit is connected to the gas turbine combustion test bench. The relief circuit is respectively connected to the main fuel path and multiple fuel branches. Thus, based on the multiple functional branches in the fuel supply system of the gas turbine combustion test bench, the gas turbine combustion test bench can operate stably under the working condition parameters of different gas turbines, reducing the complexity of the operation of the gas turbine combustion test bench and improving the safety of the gas turbine combustion test bench.

[0015] Other effects of the above optional methods will be described in combination with specific embodiments below. Description of the Drawings

[0016] Figure 1It is the schematic diagram of the fuel supply system of a gas turbine combustion test bench according to an embodiment of the present application;

[0017] Figure 2 It is the logic block diagram of the fuel supply system of a gas turbine combustion test bench according to an embodiment of the present application;

[0018] Figure 3 It is the sequential control logic diagram of nitrogen and natural gas replacement according to an embodiment of the present application. Specific embodiments

[0019] The embodiments of the present application will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present application, and should not be construed as limiting the present application.

[0020] The fuel supply system of the gas turbine combustion test bench according to the embodiment of the present application will be described below with reference to the drawings.

[0021] Figure 1 It is the schematic diagram of the fuel supply system of a gas turbine combustion test bench according to an embodiment of the present application.

[0022] As Figure 1 shown, the fuel supply system of the gas turbine combustion test bench includes a main fuel path 101, a fuel branch 102, a replacement gas circuit 103, a purging circuit 104, a venting circuit 105, and a gas turbine combustion test bench (not shown in the figure), where:

[0023] In some embodiments, the gas turbine combustion test bench may be a heavy gas turbine combustion test bench, but is not limited thereto.

[0024] In some other embodiments, the fuel supply system of the gas turbine combustion test bench may supply fuel to single-stage and multi-stage burners, single-gas fuel gas turbines, and dual-fuel gas turbines, but is not limited thereto, and this embodiment does not make specific limitations thereto.

[0025] In some embodiments, as Figure 1 shown, the main fuel path 101 is connected to a plurality of fuel branches 102 for supplying fuel to the plurality of fuel branches 102.

[0026] In some embodiments, the fuel may be natural gas, rich / pure hydrogen, biomass gas, but is not limited thereto, and this embodiment does not make specific limitations thereto.

[0027] In some embodiments, the main fuel path 101 and the fuel branch 102 may be composed of a plurality of transmission pipes for transmitting fuel.

[0028] In some embodiments, such as Figure 1 shown, a plurality of fuel branches 102 are respectively connected to their corresponding gas turbine combustion test benches for delivering fuel to each gas turbine combustion test bench.

[0029] In some embodiments, when it is necessary to switch the preset gas turbine combustion test bench, the preset valve of the fuel branch 102 corresponding to the gas turbine combustion test bench is opened to realize the intelligent control of the gas turbine combustion test benches corresponding to the respective fuel branches 102.

[0030] In some embodiments, such as Figure 1 shown, the purge gas circuit 103 is respectively connected to the main fuel path 101, a plurality of fuel branches 102 and the gas turbine combustion test bench, and is used for purging the fuel in the transmission pipelines corresponding to the main fuel path 101 and each fuel branch 102, as well as the residual fuel of the gas turbine combustion test bench.

[0031] In some embodiments, the gas transmitted in the purge gas circuit 103 may be an inert gas, such as nitrogen, carbon dioxide, but is not limited thereto, and this embodiment does not make specific limitations thereto.

[0032] In some embodiments, by purging the fuel in the main fuel path 101, a plurality of fuel branches 102 and the gas turbine combustion test bench through the purge gas circuit 103, the residual air in the main fuel path 101, a plurality of fuel branches 102 and the gas turbine combustion test bench can be emptied, avoiding the danger brought by the mixture of air and fuel during operation, and ensuring the safety of the fuel supply system of the gas turbine combustion test bench.

[0033] In some embodiments, such as Figure 1 shown, the purge circuit 104 is connected to the gas turbine combustion test bench and is used for purging the fuel nozzles in the gas turbine combustion test bench according to the purge gas in the purge circuit 104.

[0034] In some embodiments, the purge gas in the purge circuit 104 may be air or carbon dioxide, but is not limited thereto.

[0035] In some embodiments, such as Figure 1 shown, the blowdown circuit 105 is respectively connected to the main fuel path 101 and a plurality of fuel branches 102 and is used for discharging the fuel in the transmission pipelines corresponding to the main fuel path 101 and a plurality of fuel branches 102.

[0036] In some embodiments, such as Figure 1 shown, a pressure regulating module 1011, a first shut-off valve 1012, an emergency shut-off valve 1013 and a heater 1014 are installed on the transmission pipeline of the main fuel path 101, wherein:

[0037] The output of the pressure regulating module 1011 is connected to the input of the first shut-off valve 1012 through a transmission pipeline, and is used to control the pressure of the fuel in the transmission pipeline of the main fuel path 101.

[0038] Among them, as Figure 1 shown, the pressure regulating module 1011 can be composed of multiple pressure regulating valves. For example, it can be three pressure regulating valves, namely pressure regulating valve A, pressure regulating valve B, and pressure regulating valve C, so as to jointly control the pressure of the fuel in the transmission pipeline of the main fuel path 101 through multiple pressure regulating valves.

[0039] The output of the first shut-off valve 1012 is connected to the input of the emergency shut-off valve 1013 through a transmission pipeline, and is used to control the start and stop of the fuel transmission to the transmission pipeline of the main fuel path 101.

[0040] In some embodiments, when the first shut-off valve 1012 is in the open state, it controls the start of the fuel transmission to the transmission pipeline of the main fuel path 101. When the first shut-off valve 1012 is in the closed state, it controls the stop of the fuel transmission to the transmission pipeline of the main fuel path 101.

[0041] The output of the emergency shut-off valve 1013 is connected to the input of the heater 1014 through a transmission pipeline, and is used to emergently stop the transmission of the fuel in the transmission pipeline in the main fuel path 101.

[0042] The output of the heater 1014 is connected to multiple fuel branches 102 through a transmission pipeline, and is used to preheat the fuel in the transmission pipeline of the main fuel path 101.

[0043] In some embodiments, to improve the combustion efficiency of the gas turbine combustion test bench, the fuel in the transmission pipeline of the main fuel path 101 can be preheated to a preset temperature, and then the fuel at the preset temperature is transmitted to the gas turbine combustion test bench to improve the ignition efficiency of the gas turbine combustion test bench.

[0044] In some embodiments, as Figure 1 shown, a regulating valve 1021 and a second shut-off valve 1022 are installed on the transmission pipeline of the fuel branch 102, where:

[0045] The input of the regulating valve 1021 is connected to the output of the heater 1014, and the output of the regulating valve 1021 is connected to the second shut-off valve 1022, and is used to regulate the flow rate of the fuel in the transmission pipeline of the fuel branch 102.

[0046] In some embodiments, the flow rate of fuel in the transmission pipeline of the fuel branch 102 can be dynamically adjusted by regulating the valve opening of the regulating valve 1021 to control the fuel flow rate value to meet the target fuel flow rate value required in the gas turbine combustion test bench. The valve opening can be remotely regulated through a network or manually regulated.

[0047] The output of the second shut-off valve 1022 is connected to the gas turbine combustion test bench through a transmission pipeline, and is used to control the start and stop of fuel transmission to the gas turbine combustion test bench.

[0048] In some embodiments, when the second shut-off valve 1022 is in the open state, the fuel transmission to the gas turbine combustion bench is controlled to start. When the first shut-off valve 1012 is in the closed state, the fuel transmission to the gas turbine combustion bench is controlled to stop.

[0049] In some embodiments, as Figure 1 shown, the purge gas circuit 103 includes a first purge gas circuit 1031 and a second purge gas circuit 1032, where:

[0050] The output of the first purge gas circuit 1031 is connected to the output of the first shut-off valve 1012, and is used to purge the fuel in the transmission pipelines of the fuel main path 101 and the fuel branch 102 based on low-pressure gas.

[0051] In this embodiment, low-pressure nitrogen can be used as the low-pressure gas to purge the fuel in the transmission pipelines of the fuel main path 101 and the fuel branch 102 into low-pressure nitrogen, but it is not limited to this.

[0052] The output of the second purge gas circuit 1032 is respectively connected to the output of the regulating valve 1021 and the gas turbine combustion test bench, and is used to purge the fuel in the transmission pipeline of the fuel branch 102 and the residual fuel in the gas turbine combustion test bench based on high-pressure gas.

[0053] In this embodiment, high-pressure nitrogen can be used as the high-pressure gas to purge the fuel in the transmission pipeline of the fuel branch 102 and the residual fuel in the gas turbine combustion test bench into high-pressure nitrogen, but it is not limited to this.

[0054] In some embodiments, as Figure 1 shown, a third shut-off valve 10311 is installed on the transmission pipeline of the first purge gas circuit 1031, where:

[0055] The output of the third shut-off valve 10311 is connected to the output of the first shut-off valve 1012 through a transmission pipeline, and is used to control the start and stop of the transmission of low-pressure gas to the transmission pipelines of the fuel main path 101 and the fuel branch 102.

[0056] In some embodiments, when the third shut-off valve 10311 is in the open state, the control allows the low-pressure gas to start being transmitted to the transmission pipelines of the main fuel path 101 and the fuel branch path 102. When the third shut-off valve 10311 is in the closed state, the control stops the low-pressure gas from being transmitted to the transmission pipelines of the main fuel path 101 and the fuel branch path 102.

[0057] In some embodiments, as Figure 1 shown, a fourth shut-off valve 10321 and a fifth shut-off valve 10322 are installed on the transmission pipeline of the second replacement gas circuit 1032, where:

[0058] The output of the fourth shut-off valve 10321 is connected to the input of the fifth shut-off valve 10322 through a transmission pipeline, and is used to control the start and stop of the transmission of high-pressure gas to the second replacement gas circuit 1032.

[0059] In some embodiments, when the fourth shut-off valve 10321 is in the open state, the control allows the high-pressure gas to start being transmitted to the transmission pipeline of the second replacement gas circuit 1032. When the fourth shut-off valve 10321 is in the closed state, the control stops the high-pressure gas from being transmitted to the transmission pipeline of the second replacement gas circuit 1032.

[0060] The output of the fifth shut-off valve 10322 is connected to the gas turbine combustion test bench through a transmission pipeline, and is used to control the start and stop of the transmission of high-pressure gas to the gas turbine combustion test bench.

[0061] In some embodiments, when the fifth shut-off valve 10322 is in the open state, the control allows the high-pressure gas to start being transmitted to the gas turbine combustion test bench. When the fifth shut-off valve 10322 is in the closed state, the control stops the high-pressure gas from being transmitted to the gas turbine combustion test bench.

[0062] In some embodiments, as Figure 1 shown, a check valve 10323 is also installed on the transmission pipeline of the second replacement gas circuit 1032, where:

[0063] The check valve 10323 is installed between the output of the shut-off valve and the gas turbine combustion test bench, and is used to prevent the high-pressure gas from flowing back and improve the safety of the second replacement gas circuit.

[0064] In some embodiments, as Figure 1 shown, a sixth shut-off valve 10324 is also installed on the transmission pipeline of the second replacement gas circuit 1032, where:

[0065] The input of the sixth shut-off valve 10324 is connected to the output of the fourth shut-off valve 10321 through a transmission pipeline, and the output of the sixth shut-off valve 10324 is connected to the output of the regulating valve 1021 through a transmission pipeline, which is used to control the start and stop of the transmission of high-pressure gas to the transmission pipeline of the fuel branch 102.

[0066] In some embodiments, when the sixth shut-off valve 10324 is in the open state, the transmission of high-pressure gas to the transmission pipeline of the fuel branch 102 is controlled to start, and when the sixth shut-off valve 10324 is in the closed state, the transmission of high-pressure gas to the transmission pipeline of the fuel branch 102 is controlled to stop.

[0067] In some embodiments, as Figure 1 shown, a pressure regulating valve 1041 and a seventh shut-off valve 1042 are installed on the purging circuit 104, where:

[0068] The output of the pressure regulating valve 1041 is connected to the input of the seventh shut-off valve 1042, which is used to control the start and stop of the transmission of purging gas to the purging circuit 104.

[0069] The seventh shut-off valve 1042 is connected to the gas turbine combustion test bench through a transmission pipeline, which is used to control the start and stop of the transmission of purging gas to the gas turbine combustion test bench.

[0070] In some embodiments, when the seventh shut-off valve 1042 is in the open state, the transmission of purging gas to the gas turbine combustion test bench is controlled to start, and when the seventh shut-off valve 1042 is in the closed state, the transmission of purging gas to the gas turbine combustion test bench is controlled to stop.

[0071] In some other embodiments, when there are three nozzles in the gas turbine combustion test bench and ignition is required, among them, the three nozzles can be the central nozzle, the peripheral nozzle 1, and the peripheral nozzle 2. The second shut-off valve 1022 on the transmission pipeline of the fuel branch 102 corresponding to the three nozzles can be adjusted to the closed (OFF) state, then the regulating valve 1021 is opened, the fuel flow value is adjusted to the preset target fuel flow value, then the second shut-off valve 1022 is adjusted to the open (ON) state, and at the same time the igniter is started to ignite the fuel at the central nozzle, the peripheral nozzle 1, and the peripheral nozzle 2. If the ignition is successful, the fuel flow value is dynamically adjusted according to the combustion state. If the ignition is unsuccessful, the second shut-off valve 1022 and the regulating valve 1021 are urgently closed to reduce fuel loss.

[0072] In addition, when any nozzle of the combustion stage needs to be purged, the control valve 1021 on the transmission pipeline of the fuel branch 102 corresponding to this nozzle can be closed first, and the second shut-off valve 1022 can also be closed. Then, the purge circuit 104 is controlled to be opened to perform air purging on the nozzles of the downstream gas turbine combustion stage, so as to quickly cool the nozzles, provide thermal protection for the nozzles, and extend the service life of the nozzles.

[0073] In some embodiments, as Figure 1 shown, a first bleed valve 1051 and a second bleed valve 1052 are installed on the transmission pipeline of the bleed circuit 105, where:

[0074] The output of the first bleed valve is connected to the input of the emergency shut-off valve 1013 and is used to bleed the fuel in the transmission pipeline of the main fuel path 101.

[0075] In some embodiments, when the fuel in the transmission pipeline of the main fuel path 101 is replaced with nitrogen, the nitrogen in the transmission pipeline of the main fuel path 101 can also be discharged through the bleed valve.

[0076] The output of the second bleed valve 1052 is connected to the input of the second shut-off valve 1022 and is used to bleed the fuel in the transmission pipeline of the fuel branch 102.

[0077] In some embodiments, when the fuel in the transmission pipeline of the fuel branch 102 is replaced with nitrogen, the nitrogen in the transmission pipeline of the fuel branch 102 can also be discharged through the bleed valve.

[0078] In summary, for a better understanding of this application, a logic block diagram of a fuel supply system for a gas turbine combustion test bench is proposed in this application. Taking natural gas as the fuel, nitrogen as the replacement gas, and air as the purge gas as an example, as Figure 2As shown in the figure, the control process of the fuel can be as follows. When it is confirmed that nitrogen replacement is required, first open the valve to replace the gas in the transmission pipelines of the main fuel path 101 and the fuel branch path 102 with nitrogen, and then open the valve to replace the gas in the transmission pipelines of the main fuel path 101 and the fuel branch path 102 with natural gas. According to the fuel input instruction, adjust the second shut-off valve 1022 of the fuel branch path 102 to the closed (OFF) state, and at the same time adjust the fuel flow value of the fuel branch path 102 to reach the preset fuel flow value. Then obtain the ignition instruction of the gas turbine test combustion platform and turn on the igniter, and synchronously adjust the second shut-off valve 1022 of the fuel branch path 102 to the open (ON) state. If the ignition fails, close the second shut-off valve 1022. If the ignition is successful, adjust the fuel supply according to the test conditions of the gas turbine. Among them, the fuel supply can be controlled automatically by adjusting the valve opening of the regulating valve 1021 of the fuel branch path 102 and manually by adjusting the valve opening of the regulating valve 1021 of the fuel branch path 102. When the fuel branch path 102 changes, a switching instruction for the fuel branch path 102 can be obtained, and the second shut-off valve 1022 of the preset fuel branch path 102 can be adjusted to open or close. If the regulating valve 1021 of the preset fuel branch path 102 controls the fuel at the set flow value, an air purge instruction is turned on to purge the fuel branch path 102 before switching, and the second shut-off valve 1022 and the regulating valve 1021 of the preset fuel branch path 102 are adjusted to close. Then open or close the purge circuit to purge the preset fuel branch path 102 until the test end instruction is obtained. Sequentially close the second shut-off valve 1022, the purge circuit 104, and the regulating valve 1021 to close the fuel supply system of the gas turbine combustion test platform.

[0079] In addition, the present application also proposes a sequence control logic for nitrogen and natural gas replacement, as Figure 3 shown. On the one hand, the sequence control logic for nitrogen replacement of the fuel supply system of the gas turbine combustion test platform can be as follows. By closing the first shut-off valve 1012 and the second shut-off valve 1022, opening the emergency shut-off valve 1013, the first relief valve 1051, the regulating valve 1021, and the second relief valve 1052, and opening the third shut-off valve 10311, nitrogen replacement of the main fuel path 101 can be completed. After a preset delay time, where the preset delay time can be 10 seconds, by closing the third shut-off valve 10311, closing the emergency shut-off valve 1013, the first relief valve 1051, the second relief valve 1052, and the regulating valve 1021, and opening the fourth shut-off valve 10321 and the sixth shut-off valve 10324, nitrogen replacement of the fuel branch path 102 can be completed. After another preset delay time, close the fourth shut-off valve 10321 and the fifth shut-off valve 10322 to complete nitrogen replacement of the fuel supply system of the gas turbine combustion test platform.

[0080] On the other hand, the sequence control logic of the fuel supply system for the natural gas replacement gas turbine combustion test bench can be as follows: by closing the second shut-off valve 1022, opening the emergency shut-off valve 1013, the first relief valve 1051, the regulating valve 1021, and the second relief valve 1052, and opening the first shut-off valve 1012, after a preset delay time, the first shut-off valve 1012 can be closed, and the first relief valve 1051, the regulating valve 1021, and the second relief valve 1052 can be closed, thereby completing the natural gas replacement of the fuel main path 101.

[0081] This application proposes a fuel supply system for a gas turbine combustion test bench. Among them, the system includes a fuel main path, fuel branch paths, a replacement gas circuit, a purging circuit, a relief circuit, and a gas turbine combustion test bench. The fuel main path is connected to multiple fuel branch paths, and the multiple fuel branch paths are respectively connected to their corresponding gas turbine combustion test benches. The replacement gas circuit is respectively connected to the fuel main path, multiple fuel branch paths, and the gas turbine combustion test bench. The purging circuit is connected to the gas turbine combustion test bench. The relief circuit is respectively connected to the fuel main path and multiple fuel branch paths. Thus, based on the multiple functional branch paths in the fuel supply system of the gas turbine combustion test bench, the gas turbine combustion test bench can operate stably under the working condition parameters of different gas turbines, reducing the complexity of the operation of the gas turbine combustion test bench and improving the safety of the gas turbine combustion test bench.

[0082] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of this application, "a plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0083] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0084] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A fuel supply system for a gas turbine combustion test bench, characterized in that, The fuel supply system of the gas turbine combustion test bench includes a main fuel path, fuel branches, a purge gas circuit, a purging circuit, a venting circuit, and a gas turbine combustion test bench, where: The main fuel path is connected to a plurality of the fuel branches and is used to supply fuel to the plurality of fuel branches; The plurality of fuel branches are respectively connected to their corresponding gas turbine combustion test benches and are used to transport fuel to each of the gas turbine combustion test benches; The purge gas circuit is respectively connected to the main fuel path, the plurality of fuel branches, and the gas turbine combustion test bench and is used to purge the fuel in the transmission pipelines corresponding to the main fuel path and each of the fuel branches, as well as the residual fuel of the gas turbine combustion test bench; The purging circuit is connected to the gas turbine combustion test bench and is used to purge the fuel nozzles in the gas turbine combustion test bench according to the purging gas in the purging circuit; The venting circuit is respectively connected to the main fuel path and the plurality of fuel branches and is used to discharge the fuel in the transmission pipelines corresponding to the main fuel path and the plurality of fuel branches; 2. The fuel supply system of the gas turbine combustion test bench according to claim 1, characterized in that, A pressure regulating module, a first shut-off valve, an emergency shut-off valve, and a heater are installed on the transmission pipeline of the main fuel path, where: The output of the pressure regulating module is connected to the input of the first shut-off valve through a transmission pipeline and is used to control the pressure of the fuel in the transmission pipeline of the main fuel path; The output of the first shut-off valve is connected to the input of the emergency shut-off valve through a transmission pipeline and is used to control the start and stop of the fuel transmission to the transmission pipeline of the main fuel path; The output of the emergency shut-off valve is connected to the input of the heater through a transmission pipeline and is used to emergently stop the transmission of the fuel in the transmission pipeline of the main fuel path; The output of the heater is connected to the plurality of fuel branches through a transmission pipeline and is used to preheat the fuel in the transmission pipeline of the main fuel path; 3. The fuel supply system of the gas turbine combustion test bench according to claim 2, characterized in that, A regulating valve and a second shut-off valve are installed on the transmission pipeline of the fuel branch, where: The input of the regulating valve is connected to the output of the heater, and the output of the regulating valve is connected to the second shut-off valve and is used to regulate the flow rate of the fuel in the transmission pipeline of the fuel branch; The output of the second shut-off valve is connected to the gas turbine combustion test bench through a transmission pipeline and is used to control the start and stop of the fuel transmission to the gas turbine combustion test bench; 4. The fuel supply system of the gas turbine combustion test bench according to claim 3, characterized in that, The purge gas circuit includes a first purge gas circuit and a second purge gas circuit, where: The output of the first purge gas circuit is connected to the output of the first shut-off valve and is used to purge the fuel in the transmission pipelines of the main fuel path and the fuel branches based on low-pressure gas; The output of the second purge gas circuit is respectively connected to the output of the regulating valve and the gas turbine combustion test bench and is used to purge the fuel in the transmission pipeline of the fuel branch and the residual fuel of the gas turbine combustion test bench based on high-pressure gas; 5. The fuel supply system of the gas turbine combustion test bench according to claim 4, characterized in that, A third shut-off valve is installed on the transmission pipeline of the first purge gas circuit, where: The output of the third shut-off valve is connected to the output of the first shut-off valve through a transmission pipeline, and is used to control the start and stop of the transmission of the low-pressure gas to the transmission pipelines of the fuel main path and the fuel branch path.

6. The fuel supply system of the gas turbine combustion test bench according to claim 4, characterized in that, A fourth shut-off valve and a fifth shut-off valve are installed on the transmission pipeline of the second replacement gas circuit, where: The output of the fourth shut-off valve is connected to the input of the fifth shut-off valve through a transmission pipeline, and is used to control the start and stop of the transmission of the high-pressure gas to the second replacement gas circuit; The output of the fifth shut-off valve is connected to the gas turbine combustion test bench through a transmission pipeline, and is used to control the start and stop of the transmission of the high-pressure gas to the gas turbine combustion test bench.

7. The fuel supply system of the gas turbine combustion test bench according to claim 6, characterized in that, A check valve is also installed on the transmission pipeline of the second replacement gas circuit, where: The check valve is installed between the output of the shut-off valve and the gas turbine combustion test bench, and is used to prevent the high-pressure gas from flowing back.

8. The fuel supply system of the gas turbine combustion test bench according to claim 6, characterized in that, A sixth shut-off valve is also installed on the transmission pipeline of the second replacement gas circuit, where: The input of the sixth shut-off valve is connected to the output of the fourth shut-off valve through a transmission pipeline, and the output of the sixth shut-off valve is connected to the output of the regulating valve through a transmission pipeline, and is used to control the start and stop of the transmission of the high-pressure gas to the transmission pipeline of the fuel branch path.

9. The fuel supply system of the gas turbine combustion test bench according to claim 6, characterized in that, A pressure regulating valve and a seventh shut-off valve are installed on the purging circuit, where: The output of the pressure regulating valve is connected to the input of the seventh shut-off valve, and is used to control the start and stop of the transmission of the purging gas to the purging circuit; The seventh shut-off valve is connected to the gas turbine combustion test bench through a transmission pipeline, and is used to control the start and stop of the transmission of the purging gas to the gas turbine combustion test bench.

10. The fuel supply system of the gas turbine combustion test bench according to claim 4, characterized in that, A first relief valve and a second relief valve are installed on the transmission pipeline of the venting circuit, where: The output of the first relief valve is connected to the input of the emergency shut-off valve, and is used to vent the fuel in the transmission pipeline of the fuel main path; The output of the second relief valve is connected to the input of the second shut-off valve, and is used to vent the fuel in the transmission pipeline of the fuel branch path.

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