A test method for a gas turbine with power output simultaneously before and after a hybrid load

Abstract

The application provides a gas turbine test method for a power front-back simultaneous output mixed load, comprising the following steps: constructing a transmission model for a front-back simultaneous output power of a gas turbine test, taking a power turbine rotor of the gas turbine as a reference point, and outputting a torque and a power to a front load system and a rear load system at an axial front end and a rear end respectively; setting a tension-compression sensor on the front load system, collecting a braking torque through the tension-compression sensor, calculating a torque according to a force arm, and realizing front output power measurement; setting a torsion shaft on a rear output shaft system of the power turbine, acquiring a real-time torque value of the torsion shaft through a phase type torque measurement device, realizing power measurement of the rear output shaft system, and taking a total power of the gas turbine as a sum of front and rear output powers; during a starting to slow vehicle stage of the gas turbine, adjusting a power turbine shaft system load through the front load system, realizing speed control of the power turbine, and after the slow vehicle, changing a load size of the power turbine output at the axial front and rear to realize adjustment and control of the gas turbine output power.

Description

A test method for a gas turbine with mixed loads that output power simultaneously before and after the load. Technical Field

[0001] This application belongs to the field of gas turbine testing, and specifically relates to a gas turbine testing method for a mixed load with simultaneous power output before and after the load. Background Technology

[0002] In the field of aero-to-gas turbine (i.e., converting aero engines into gas turbines) testing, existing aero-to-gas turbines are mainly of the single-output type—either front-output or rear-output. The front-output dynamometer load testing and rear-output generator load testing of these single-output types are relatively mature. However, when faced with the requirement of simultaneous front and rear output of the gas turbine, with adjustable front and rear output power, existing single-output testing methods can only achieve unidirectional gas turbine performance testing, failing to meet the requirements for simultaneous front and rear power output testing. Furthermore, existing load configurations are limited to a single load configuration, unable to achieve performance testing under different load configurations. Summary of the Invention

[0003] The purpose of this application is to provide a test method for a gas turbine that simultaneously outputs mixed loads before and after power, in order to solve or mitigate at least one of the problems in the prior art.

[0004] The technical solution of this application is: a test method for a gas turbine with mixed loads that simultaneously output power before and after the load, comprising:

[0005] A power transfer model for simultaneous front and rear output of a gas turbine is constructed for testing. The transfer model takes the power turbine rotor of the gas turbine as the reference point, and the power turbine shaft outputs torque and power to the front load system and the rear load system at the front and rear ends, respectively.

[0006] A tension / compression sensor is installed on the front load system to collect braking torque. The torque is calculated based on the lever arm to measure the front output power. A transmission system with a torsion shaft is installed on the rear output shaft of the power turbine. A phase-type torque measuring device is used to obtain the real-time torque value of the torsion shaft to measure the power of the rear output shaft. The total power of the gas turbine is the sum of the front output power and the rear output power.

[0007] During the gas turbine start-up and idle phase, the power turbine shaft load is adjusted by regulating the valve position of the front load system to achieve power turbine speed control. After idle, the gas turbine output power is adjusted and controlled by changing the load magnitude of the power turbine shaft output forward and backward.

[0008] Furthermore, the front load system is a hydraulic dynamometer load system, and the rear load system is a generator load system.

[0009] Furthermore, the power turbine axial front end outputs power to the hydraulic dynamometer load system, the gas turbine drives the hydraulic dynamometer rotor, and the water forms a frictional torque on the rotating hydraulic dynamometer rotor to absorb and transfer the output power of the gas turbine. The power output by the gas turbine is converted into heat energy through the friction of water molecules in the hydraulic dynamometer, and finally the power is consumed through external circulation.

[0010] Furthermore, the output torque of the power turbine shaft at the rear end is transmitted sequentially to the generator of the generator load system through the torsion shaft and gearbox of the transmission system. The output torque of the power turbine shaft at the rear end of the gas turbine is first transmitted to the torsion shaft, then to the gearbox. The gearbox achieves high-low speed conversion through the speed change gear, and then transmits it to the generator. The generator converts mechanical energy into electrical energy output through the principle of electromagnetic induction. The electrical energy is directly converted into heat energy through the resistance of the load box of the generator load system and consumed by air cooling.

[0011] Furthermore, during the gas turbine's start-up and idle phase, an open-loop control method is used to control the power turbine.

[0012] Furthermore, after slowing down, a closed-loop control method is used to control the power turbine.

[0013] Furthermore, the hydraulic dynamometer can adjust and control the power absorbed by the hydraulic dynamometer by controlling the opening of the inlet and outlet water valves with high responsiveness;

[0014] At rated speed, the generator is excited and closed. By changing the resistance power of the input load box, the generator can adjust and control the power absorbed. The axial output power value of the power turbine is calculated in real time based on the measurement parameters of the phase torque measuring device at the axial rear end of the power turbine.

[0015] The gas turbine test method for simultaneous power output with mixed load provided in this application establishes a power transfer model for simultaneous power output, a power measurement process for simultaneous power output, and a load adjustment method for simultaneous power output. Compared with the prior art, this method can achieve simultaneous power output and mixed load matching and control of the gas turbine, accurately measure the power at the front and rear output ends, and can be used as a test model for simultaneous power output of ships. Attached Figure Description

[0016] To more clearly illustrate the technical solutions provided in this application, the accompanying drawings will be briefly described below. Obviously, the drawings described below are merely some embodiments of this application.

[0017] Figure 1 is a schematic diagram of a typical aero-derivative gas turbine test system.

[0018] Figure 2 is a schematic diagram of the simultaneous output power transfer model of this application. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings.

[0020] Figure 1 shows a typical aero-to-gas turbine test system. The compressor, combustion chamber, turbine, and power turbine constitute the aero-to-gas turbine, and the load is located at the front of the aero-to-gas turbine to achieve front output.

[0021] In order to overcome the limitations of existing aero-derivative gas turbines, which only have unidirectional output capabilities and methods for front or rear output, this application proposes a gas turbine test method for mixed loads with simultaneous front and rear power output. It explores test models, power control methods, key parameter measurement methods, and speed control methods for simultaneous front and rear bidirectional output of the gas turbine, thereby solving the technical challenges of bidirectional output.

[0022] The test method for a gas turbine with mixed loads that simultaneously output power before and after the load provided in this application includes the following:

[0023] I. Establishing a power transfer model for simultaneous output power before and after gas turbine testing.

[0024] As shown in Figure 2, in the transmission model, the gas turbine 20 serves as the prime mover. With the power turbine rotor of the gas turbine 20 as the reference point, the axial front and rear output torque and power of the power turbine 21 are distributed to the front load system and the rear load system respectively, thereby achieving torque balance and power consumption.

[0025] In this application, the load system includes a hydraulic dynamometer load system 10 and a generator load system 40. In this embodiment, the power output from the front end of the power turbine shaft of the gas turbine 20 is transmitted to the hydraulic dynamometer 11 of the hydraulic dynamometer load system 10. The gas turbine 20 drives the rotor of the hydraulic dynamometer, and the frictional torque generated by water on the rotating hydraulic dynamometer rotor absorbs and transmits the output power of the gas turbine 20, achieving front output torque balance. The power output by the gas turbine 20 is converted into heat energy through the friction of water molecules in the hydraulic dynamometer, and the power is ultimately consumed through external circulation.

[0026] The output torque from the rear end of the power turbine shaft of the gas turbine 20 is transmitted sequentially to the generator 41 of the generator load system through the torsion shaft 31 and gearbox 32 of the transmission system 30. The output torque from the rear end of the power turbine shaft of the gas turbine 20 is first transmitted to the torsion shaft 31, and then to the gearbox 32. The gearbox 32 realizes high and low speed conversion through the speed change gear, and then transmits it to the generator 41. The generator 41 converts mechanical energy into electrical energy output through the principle of electromagnetic induction. The electrical energy is directly converted into heat energy through the resistance of the load box 42 and consumed by air cooling.

[0027] II. Measurement of simultaneous output power from both ends

[0028] For measuring the output torque at the front end of the power turbine shaft, a tension and compression sensor is set on the hydraulic dynamometer body. The braking torque is collected by the tension and compression sensor, and the torque is calculated by the lever arm to realize the measurement of the front output power.

[0029] For measuring the rear output torque of the power turbine 21, a torsion shaft is set on the rear output shaft system, and a phase-type torque measuring device is used to obtain the real-time torque value of the torsion shaft, thereby realizing the power measurement of the rear output shaft system.

[0030] The total power of the gas turbine 20 is the sum of the power output from the front and the power output from the rear.

[0031] III. Loading and unloading control of simultaneous output power from both ends

[0032] To adapt to the operating characteristics of the hydraulic dynamometer and generator, an open-loop control mode for the power turbine is adopted during the start-up to idle stage of the gas turbine 20. The shaft load is adjusted by regulating the valve position of the hydraulic dynamometer 11 to achieve speed control of the power turbine 21. After idle, a closed-loop control mode for the power turbine is adopted, and the output power of the gas turbine is adjusted and controlled by changing the load output of the power turbine shaft in the forward and backward directions.

[0033] Among them, the hydraulic dynamometer 11 adjusts and controls the power absorbed by controlling the opening of the inlet and outlet water valves with high response capability, and the loading method is stepless loading; the generator 41 is under rated speed, and the generator 41 is excited and closed. The generator adjusts and controls the power absorbed by changing the power of the load box resistance. The axial rear-end output power value of the power turbine is calculated in real time according to the measurement parameters of the phase torque measuring device at the axial rear end of the power turbine, and the loading method is polarized loading.

[0034] The gas turbine test method for simultaneous power output with mixed load provided in this application establishes a power transfer model for simultaneous power output, a power measurement process for simultaneous power output, and a load adjustment method for simultaneous power output. Compared with the prior art, this method can achieve simultaneous power output and mixed load matching and control of the gas turbine, accurately measure the power at the front and rear output ends, and can be used as a test model for simultaneous power output of ships.

[0035] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A test method for a gas turbine with a mixed load that outputs power simultaneously before and after the load, characterized in that, include: A power transfer model for simultaneous front and rear output power in a gas turbine test is constructed. This model uses the turbine rotor as a reference point, with the turbine shaft outputting torque and power to the front and rear load systems, respectively. Tension / compression sensors are installed on the front load system to collect braking torque, and the torque is calculated based on the lever arm to measure the front output power. A transmission system with a torsion shaft is installed on the rear output shaft of the turbine. A phase-type torque measuring device is used to obtain the real-time torque value of the torsion shaft, enabling power measurement of the rear output shaft system. The total power of the gas turbine is the sum of the front and rear output power. During the gas turbine start-up to idle phase, the turbine shaft load is adjusted by regulating the valve position of the front load system to control the turbine speed. After idle, the gas turbine output power is adjusted and controlled by changing the load magnitude of the turbine shaft's front and rear outputs.

2. The gas turbine test method for simultaneously outputting power to a mixed load as described in claim 1, characterized in that, The front load system is a hydraulic dynamometer load system, and the rear load system is a generator load system.

3. The test method for a gas turbine with simultaneous power output and mixed load as described in claim 2, characterized in that, The power turbine outputs power to the hydraulic dynamometer load system at its axial front end. The gas turbine drives the rotor of the hydraulic dynamometer. The friction torque formed by water on the rotating hydraulic dynamometer rotor absorbs and transmits the output power of the gas turbine. The power output by the gas turbine is converted into heat energy through the friction of water molecules in the hydraulic dynamometer, and finally the power is consumed through external circulation.

4. The gas turbine test method for simultaneously outputting power before and after a mixed load as described in claim 2, characterized in that, The output torque from the rear end of the power turbine shaft is transmitted sequentially to the generator of the generator load system through the torsion shaft and gearbox of the transmission system. The output torque from the rear end of the power turbine shaft of the gas turbine is first transmitted to the torsion shaft, then to the gearbox. The gearbox achieves high-low speed conversion through the speed change gear, and then transmits it to the generator. The generator converts mechanical energy into electrical energy output through the principle of electromagnetic induction. The electrical energy is directly converted into heat energy through the resistance of the load box of the generator load system and consumed by air cooling.

5. The test method for a gas turbine with simultaneous power output and mixed load as described in claim 3 or 4, characterized in that, During the start-up and idle phase of the gas turbine, an open-loop control method is used to control the power turbine.

6. The test method for a gas turbine with simultaneous power output and mixed load as described in claim 5, characterized in that, After slowing down, a closed-loop control method is used to control the power turbine.

7. The gas turbine test method for simultaneously outputting power to a mixed load as described in claim 6, characterized in that, The hydraulic dynamometer adjusts and controls the power absorbed by controlling the opening of the inlet and outlet water valves with high responsiveness. The generator adjusts and controls the power absorbed by changing the resistance power of the load box when it is excited and closed at the rated speed. The axial output power value of the power turbine is calculated in real time based on the measurement parameters of the phase torque measuring device at the axial rear end of the power turbine.

Images