A turbine test system

Abstract

The present application relates to the technical field of impeller performance testing, and particularly relates to a turbine test system, comprising: a turbine test piece, an air inlet end of the turbine test piece being connected with a high-pressure air source, a temperature adjusting device being installed between the high-pressure air source and the turbine test piece; an asynchronous motor, the asynchronous motor being connected with an output shaft of the turbine test piece; a flywheel energy storage device, the flywheel energy storage device being electrically connected with the asynchronous motor, the flywheel energy storage device having a releasing state and a storing state. The flywheel energy storage device stores the excess electric energy generated by the turbine test piece during the test process, and releases the electric energy to drag the turbine test piece to reach a set rotating speed at the beginning of the next test to reduce the gas consumption during the starting process, and avoids the vibration of the turbine test piece fan blades caused by the unstable air inlet pressure during the starting process of the turbine test piece, and reduces the starting difficulty of the turbine test piece.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of impeller performance testing, in particular to a turbine test system. BACKGROUND

[0002] Turbine is a centrifugal or axial turbine, which is often used to drive the compressor or generator by expanding the high-pressure gas. Turbine is widely used as a refrigeration source in industrial processes or to expand the working medium in energy storage systems. In order to improve the performance of the turbine, establishing a test platform and carrying out various performance tests become the key link of turbine research and design.

[0003] In the turbine test process, high-pressure gas is introduced into the turbine in the test platform, and the turbine is used to expand the high-pressure gas, so that the turbine works and the performance of the turbine is tested. However, in the prior art, the high-pressure gas used in the test of the turbine needs to be pressurized and stored in advance, and the high-pressure gas is used to drive the turbine to start during the start-up process of the turbine. However, due to the repeated opening and closing adjustment process of the valve during start and stop, the high-pressure gas causes unstable impact on the turbine blades, causing the turbine blades to vibrate, affecting the service life of the turbine blades, and when the vibration amplitude is large, it will also cause the turbine to fail to start. SUMMARY

[0004] Therefore, the technical problem to be solved by the present application is to overcome the defect that the turbine blades vibrate or even fail to start during the start-up of the turbine in the turbine test in the prior art, thereby providing a turbine test system.

[0005] In order to solve the above technical problems, the present application provides a turbine test system, comprising:

[0006] A turbine test piece, the inlet end of which is connected with a high-pressure gas source, and a temperature adjusting device is installed between the high-pressure gas source and the turbine test piece;

[0007] An asynchronous motor connected with the output shaft of the turbine test piece;

[0008] A flywheel energy storage device electrically connected with the asynchronous motor, the flywheel energy storage device having a release energy state for driving the asynchronous motor to operate to start the turbine test piece, and a storage energy state for storing the electric energy generated by the asynchronous motor when the turbine test piece drives the asynchronous motor to generate electricity and rotate.

[0009] Optionally, the flywheel energy storage device and the asynchronous motor are both connected to the power grid.

[0010] Optionally, a first frequency conversion and voltage conversion device is installed between the flywheel energy storage device and the power grid.

[0011] Optionally, a second frequency conversion and pressure conversion component is installed between the asynchronous motor and the power grid.

[0012] Optionally, the temperature adjusting device is an electric heater, and the electric heater is connected to the power grid.

[0013] Optionally, an air pressure adjusting device is installed between the temperature adjusting device and the turbine test piece.

[0014] Optionally, a speed reducer is installed between the asynchronous motor and the turbine test piece.

[0015] Optionally, the turbine test piece comprises an air inlet section, a blade section and an air outlet section which are detachably connected.

[0016] Optionally, an air inlet pressure reducing valve is installed between the high-pressure air source and the temperature adjusting device.

[0017] Optionally, a switch assembly is installed between the flywheel energy storage device and the asynchronous motor.

[0018] The technical scheme of the present application has the following advantages:

[0019] 1. The turbine test system provided by the present application comprises: a turbine test piece, an air inlet end of the turbine test piece being connected to a high-pressure air source, a temperature adjusting device being installed between the high-pressure air source and the turbine test piece; an asynchronous motor, the asynchronous motor being connected to an output shaft of the turbine test piece; and a flywheel energy storage device, the flywheel energy storage device being electrically connected to the asynchronous motor, the flywheel energy storage device having a releasing energy state for driving the asynchronous motor to operate to start the turbine test piece and a storing energy state for storing electric energy generated by the asynchronous motor when the turbine test piece operates to drive the asynchronous motor to generate electricity.

[0020] In the turbine test system, the turbine test piece needs to be started first, and when the turbine test piece is started, the flywheel energy storage device stores electric energy for the asynchronous motor, the asynchronous motor drives the turbine test piece to rotate, and the turbine test piece rotates to the rated speed before the high-pressure air source is connected to the turbine test piece, the high-pressure air source drives the turbine test piece to rotate, and the starting of the turbine test piece is completed. After the turbine test piece is started, the speed, power, torque of the rotating shaft, air pressure and temperature of the turbine test piece can be measured. After the turbine test experiment is completed, during the shutdown process, the turbine test piece drives the asynchronous motor to generate electricity, and the electric energy is converted into standard electric energy, then the electric energy is transmitted to the flywheel energy storage device to be converted into mechanical energy for storing the flywheel rotation energy for use when the turbine test piece is started. The flywheel energy storage device stores the excess electric energy generated by the turbine test piece during the shutdown process, and releases the electric energy to drive the turbine test piece to reach the set speed at the beginning of the next test to reduce the gas consumption during the starting process, and avoids the vibration of the turbine test piece fan blades caused by unstable air pressure during the starting process of the turbine test piece, and reduces the starting difficulty of the turbine test piece.

[0021] 2. The turbine test system provided by the present application, by connecting the asynchronous motor and the flywheel energy storage device together on the power grid, when the asynchronous motor starts, if the electric energy in the flywheel energy storage device is insufficient to drive the asynchronous motor to work to start the turbine test piece, the power grid actively supplies power to drive the asynchronous motor to work, so that the turbine test piece can be started smoothly.

[0022] 3. The turbine test system provided by the present application, a temperature adjusting device and a turbine test piece are provided with a gas pressure adjusting device. The gas pressure adjusting device is used to control the gas pressure of the gas input into the turbine test piece, and the high-pressure gas with stable pressure is used to drive the turbine test piece to operate, so that the turbine test piece can operate stably.

[0023] 4. The turbine test system provided by the present application, the turbine test piece comprises an air inlet section, a cascade section and an air outlet section which are detachably connected. By detachably connecting the air inlet section, the cascade section and the air outlet section, different models of the air inlet section, the cascade section and the air outlet section can be disassembled and replaced for testing, which can save the disassembly and replacement time of the turbine test piece, reduce the preparation time in the test, and improve the test efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0025] Figure 1 The structure diagram of the turbine test system provided in the embodiments of the present application.

[0026] The drawings are explained as follows: 1, power grid; 2, high-voltage bus; 3, flywheel energy storage device; 4, second transformer; 5, second frequency converter; 6, first switch cabinet; 7, high-pressure gas source; 8, air inlet pressure reducing valve; 9, temperature adjusting device; 10, pressure adjusting device; 11, turbine test piece; 12, reduction gearbox; 13, asynchronous motor; 14, first frequency converter; 15, first transformer; 16, second switch cabinet; 17, third switch cabinet; 18, fourth switch cabinet; 19, third transformer. DETAILED DESCRIPTION

[0027] The technical solutions of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0028] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0031] Embodiment

[0032] As Figure 1 The turbine test system provided by the embodiment is shown, which comprises a turbine test piece 11, an asynchronous motor 13 and a flywheel energy storage device 3.

[0033] The intake end of the turbine test piece 11 is connected with a high-pressure gas source 7, and the gas outlet end of the turbine test piece 11 is communicated with the atmosphere or a gas recovery device. The gas pipeline between the high-pressure gas source 7 and the turbine test piece 11 is sequentially provided with an intake pressure reducing valve 8 and a temperature adjusting device 9. The intake pressure reducing valve 8 is installed between the high-pressure gas source 7 and the temperature adjusting device 9. The turbine test piece 11 in the embodiment is selected as a turbine expander test section.

[0034] The asynchronous motor 13 is connected with the output shaft of the turbine test piece 11, and a speed reducer 12 is installed between the asynchronous motor 13 and the turbine test piece 11. The flywheel energy storage device 3 is electrically connected with the asynchronous motor 13, and the flywheel energy storage device 3 has a releasing energy state of driving the asynchronous motor 13 to operate to drive the turbine test piece 11 to start, and a storing energy state of storing the electric energy generated by the asynchronous motor 13 when the turbine test piece 11 operates to drive the asynchronous motor 13 to generate electricity and rotate.

[0035] The flywheel energy storage device 3 and the asynchronous motor 13 are both connected to the power grid 1. A first frequency conversion and voltage conversion device is installed between the flywheel energy storage device 3 and the power grid 1, and the first frequency conversion and voltage conversion device includes a first frequency converter 14 and a first voltage converter 15 arranged in series. A second frequency conversion and voltage conversion device is installed between the asynchronous motor 13 and the power grid 1, and the second frequency conversion and voltage conversion device includes a second frequency converter 5 and a second voltage converter 4.

[0036] The temperature adjusting device 9 is an electric heater, and the electric heater is connected with the power grid 1 to supply power to the temperature adjusting device 9 by the power grid 1. A gas pressure adjusting valve as a gas pressure adjusting device is installed between the temperature adjusting device 9 and the turbine test piece 11.

[0037] The turbine test piece 11 includes an air inlet section, a blade section and an air outlet section which are detachably connected. By detachably connecting the air inlet section, the blade section and the air outlet section, different models of the air inlet section, the blade section and the air outlet section can be disassembled and replaced for testing, which can save the time for disassembling and replacing the turbine test piece 11, reduce the preparation time in the test, and improve the test efficiency.

[0038] A switch assembly is installed between the flywheel energy storage device 3 and the asynchronous motor 13. Specifically, the power grid 1 supplies power to the devices in the system through a high-voltage bus 2, a first switch cabinet 6 as a switch assembly is installed between the flywheel energy storage device 3 and the high-voltage bus 2, and a second switch cabinet 16 as a switch assembly is installed between the asynchronous motor 13 and the high-voltage bus 2. In addition, a third switch cabinet 17 is installed between the temperature adjusting device 9 and the high-voltage bus 2, and a third voltage converter 19 is further installed between the temperature adjusting device 9 and the third switch cabinet 17. A fourth switch cabinet 18 is installed between the power grid 1 and the high-voltage bus 2 to control the on-off of the circuit between the power grid 1 and the system.

[0039] The flywheel energy storage device 3 is used to store the excess power generated by the turbine test piece 11, and to drive the turbine to the required speed when the turbine is started for the next test. The high-pressure gas source 7, the inlet pressure reducing valve 8, the temperature adjusting device 9, and the gas pressure adjusting device 10 are sequentially arranged on the inlet pipeline upstream of the turbine test piece 11. The end of the inlet pipeline is in communication with the inlet of the turbine test piece 11. The outlet of the turbine test piece 11 is in communication with the atmosphere or a gas recovery device. The gear reduction box 12, the asynchronous motor 13, the second frequency converter 5, the second transformer 4, and the second switch cabinet 16 are sequentially arranged on the power output line downstream of the turbine test piece 11. The power output shaft of the turbine test piece 11 is in driving connection with the gear reduction box 12 and the asynchronous motor 13 in sequence.

[0040] The inlet pressure reducing valve 8 is arranged on the gas communication pipeline between the high-pressure gas source 7 and the temperature adjusting device 9. The inlet pressure reducing valve 8 can automatically adjust when the pressure of the high-pressure gas source 7 increases, so as to prevent the downstream components from being damaged by the high-pressure gas flow. The inlet pressure reducing valve 8 is a valve group composed of two valves, i.e., a coarse adjustment valve and a fine adjustment valve. The inlet pressure reducing valve 8 can automatically track and adjust the inlet pressure of the compressed air according to the test conditions, and can set the change process curve of the inlet pressure to simulate the non-steady state adjustment process of the turboexpander. The number of valve groups in the gas pressure adjusting device 10 is determined according to the pressure adjustment accuracy. The temperature adjusting device 9 adopts an electric heating form, and can automatically track and adjust the temperature of the compressed air according to the test conditions, and can set the change process curve of the temperature to simulate the non-steady state adjustment process of the turboexpander.

[0041] The flywheel energy storage device 3 is connected with the power grid 1 through the first frequency converter 14, the first transformer 15, and the first switch cabinet 6. The flywheel energy storage device 3 is provided with a control system, which can control the parameters of the frequency converter according to the flywheel speed, so as to ensure that the electric parameters transmitted to the high-voltage bus 2 meet the requirements of the electric parameters of the motor in the electric power test system.

[0042] The turbine test piece 11 includes an inlet section, a blade row section, and an exhaust section, and each component can be flexibly replaced according to the experimental requirements. The structure of the turboexpander test piece can be an axial flow type or a radial flow type. The inlet section can be a radial inlet or an axial inlet, the blade row section can be a single-stage or multi-stage blade row form, and the exhaust section can be a diffuser, an elbow pipe type, a full volute type, or a box type. The reduction ratio of the gear reduction box 12 is determined according to the speed of the turboexpander to be tested and the required speed of the electric power dynamometer. The speed and torque of the turbine test piece 11 are measured by installing a speed sensor and a torque meter on the rotating shaft of the asynchronous motor 13. The power of the turbine test piece 11 can be measured according to the power generation of the asynchronous motor 13.

[0043] In the turbine test system, first, close the first switch cabinet 6, the stored energy in the flywheel energy storage device 3 is transmitted to the asynchronous motor 13 through the second frequency converter 5 and the second transformer 4, drives the asynchronous motor 13, drags the turbine test piece 11 to reach the set speed. Open the air inlet pressure reducing valve 8 on the outlet pipeline of the high pressure gas source 7, connect the compressed air from the high pressure gas source 7, the compressed air is heated to the required temperature of the experiment when passing through the electric heating type temperature adjusting device 9, then enters the pressure adjusting device 10, adjusts to the required inlet pressure of the experiment, enters the turbine test piece 11, after driving the turbine test piece 11 to do work, as exhaust gas into the atmosphere or be stored. The speed of the turbine test piece 11 is reduced to the required value through the gear reduction box 12, drives the asynchronous motor 13 to generate electricity, the generated electricity is transmitted to the electric heater for consumption or to the power grid 1 through the first frequency converter 14 and the first transformer 15 after rectification and inversion, at this time the flywheel energy storage device 3 is disconnected with the high voltage bus 2, stops transmitting electric energy to the electric power measuring device. When the turbine test piece experiment is completed and stopped, connect the flywheel energy storage device 3 with the high voltage bus 2, the turbine test piece drives the asynchronous motor to generate electricity and converts the electric energy into standard electric energy through the frequency converter 14, then transmits the electric energy to the flywheel energy storage device to convert into mechanical energy of flywheel rotation for storage, ready for next start-up use.

[0044] Obviously, the above embodiments are only examples for clearly illustrating, not limiting the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments cannot be exhausted, and the obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A turbomachine test system, characterized in that, The application relates to a turbine test piece (11) connected with a high-pressure air source (7), wherein a temperature adjusting device (9) is arranged between the high-pressure air source (7) and the turbine test piece (11); an asynchronous motor (13) is connected with an output shaft of the turbine test piece (11); a flywheel energy storage device (3) is electrically connected with the asynchronous motor (13), wherein the flywheel energy storage device (3) has a releasing energy state for driving the asynchronous motor (13) to operate to start the turbine test piece (11) and a storing energy state for storing the electric energy generated by the asynchronous motor (13) when the turbine test piece (11) operates to drive the asynchronous motor (13) to generate electricity and rotate; the flywheel energy storage device (3) stores the excess electric energy generated by the turbine test piece (11) during shutdown and releases the electric energy to drive the turbine test piece (11) to reach a set rotating speed at the beginning of the next test. The flywheel energy storage device (3) and the asynchronous motor (13) are connected with a power grid (1). A first frequency conversion and voltage conversion device is arranged between the flywheel energy storage device (3) and the power grid (1). A second frequency conversion and voltage conversion device is arranged between the asynchronous motor (13) and the power grid (1).

2. The turbomachine testing system of claim 1, wherein, The temperature adjusting device (9) is an electric heater connected with the power grid (1).

3. The turbomachine test system of claim 2, wherein, An air pressure adjusting device is arranged between the temperature adjusting device (9) and the turbine test piece (11).

4. The turbomachine test system of claim 2, wherein, A speed reducer (12) is arranged between the asynchronous motor (13) and the turbine test piece (11).

5. The turbomachinery test system of any of claims 2 to 4, wherein, The turbine test piece (11) comprises detachably connected air inlet sections, blade grid sections and air outlet sections.

6. The turbomachinery test system of any one of claims 1 to 4, wherein, An air inlet pressure reducing valve (8) is arranged between the high-pressure air source (7) and the temperature adjusting device (9).

7. The turbomachinery test system of any one of claims 1 to 4, wherein, A switch assembly is arranged between the flywheel energy storage device (3) and the asynchronous motor (13).

8. The turbomachinery test system of any one of claims 1 to 4, wherein, ​ 9. The turbomachinery test system of any of claims 1 to 4, wherein, ​ 10. The turbomachinery test system of any one of claims 1 to 4, wherein, ​

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