Device and method for measuring angular displacement of rotatable guide vane widely applied to gas compressor of gas turbine

Abstract

The invention relates to an adjustable guide vane angular displacement measuring device and a measuring method which are widely applicable to a gas turbine compressor, in the working process of a gas turbine, along with the action of an adjustable guide vane actuating mechanism and the rotation of an adjustable guide vane, a gas turbine control system calculates the angle target value of the adjustable guide vane according to the total intake temperature and the actual rotating speed of the compressor; the angular displacement sensor measures the angle value of the rotatable guide vane in real time, the measured angle is fed back to the gas turbine control system and compared with the target value of the angle of the rotatable guide vane, the gas turbine control system adjusts the angle of the rotatable guide vane of the gas compressor in real time through a difference signal, and therefore the air flow of an inlet is changed. Therefore, the optimal operation line of the compressor is adapted, and the working margin of the compressor is ensured. The device and the method have wide application value and can be applied to devices such as gas compressors, turbines, steam turbines and axial flow fans.

Description

Technical Field

[0001] The present invention belongs to the technical field of gas turbine compressor equipment, and in particular relates to a device and method for measuring the angular displacement of a rotatable guide vane which are widely applicable to gas turbine compressors. Background Art

[0002] The compressor is one of the most important components of a gas turbine, and its component performance largely determines the overall performance of the gas turbine. In order to ensure that the compressor has good performance in a wide range of working conditions, modern gas turbines are generally equipped with rotatable guide vanes and are designed with corresponding angle adjustment mechanisms. By adjusting the angle of the rotatable guide vanes, the compressor rotor can operate in a smaller range of angles of attack.

[0003] In order to improve the control accuracy and real-time performance of the guide vane angle, most gas turbine compressors at home and abroad currently use angular displacement sensors as measuring devices for adjusting the guide vane angle, and use the guide vane angle as an important state control parameter of the gas turbine compressor. Most of the currently available guide vane angle displacement measuring devices have the following disadvantages: 1) Some measuring devices are relatively complex, with many parts, time-consuming to install, and poor operability; 2) Some measuring devices require the guide vane shaft to have a switching structure connected to the measuring device; 3) Some measuring devices are large in size and difficult to use in a small space. Summary of the invention

[0004] The purpose of the present invention is to solve the problems of poor adaptability and low automation of the angular displacement measuring device of the rotatable guide vane of the gas turbine compressor, and to provide a angular displacement measuring device and a measuring method for the angular displacement of the rotatable guide vane which are widely applicable to the gas turbine compressor.

[0005] A rotatable guide vane angular displacement measuring device widely applicable to gas turbine compressors comprises a coupling assembly, a U-shaped fork connector, a bracket and an angular displacement sensor assembly; the U-shaped fork connector is connected to a shift fork and is fixedly mounted on a rotatable guide vane shaft by sleeve connection; the bracket is mounted on a compressor casing; and the angular displacement sensor assembly is mounted on the bracket.

[0006] Furthermore, the angular displacement sensor assembly includes a connecting flange and an angular displacement sensor; one end of the coupling assembly is connected to the sensing part of the angular displacement sensor and is tightened by a screw C and an anti-loosening gasket B, and the other end is inserted into the groove of the U-shaped fork connector through a cylindrical pin.

[0007] Furthermore, the U-shaped fork connector has a certain elasticity, and forms a flexible coupling with the coupling assembly to buffer the force on the angular displacement sensor, thereby protecting the angular displacement sensor.

[0008] Furthermore, the U-shaped fork connector and the shift fork are fixed on the rotating shaft of the rotatable guide vane by means of screws A and self-locking nuts.

[0009] Furthermore, the U-shaped fork connector and the rotating shaft of the rotatable guide vane are matched with each other with a small clearance, so that the axis of the center hole of the U-shaped fork connector and the rotating shaft of the rotatable guide vane are located on the same axis.

[0010] Furthermore, the angular displacement sensor assembly is mounted on the bracket by means of screws B and anti-loosening washers A.

[0011] A measuring method of a rotatable guide vane angular displacement measuring device widely applicable to a gas turbine compressor, characterized in that it comprises the following steps:

[0012] S1, installation and commissioning of the angular displacement device of the guide vane;

[0013] S1.1, after the sensing part of the angular displacement sensor is installed concentrically with the guide vane shaft, debug the guide vane angle control program of the gas turbine control system;

[0014] S1.2, adjust the hydraulic actuator or electric actuator, and determine the relationship between the angle of the rotatable guide vane and the linear displacement of the hydraulic actuator or electric actuator according to the extreme angle positions on both sides of the dial;

[0015] S1.3, calibrate the angle measured by the angular displacement sensor based on the limit angle displayed on the dial, and correct the measured value of the angular displacement sensor in the control system so that the measured value is consistent with the limit angle displayed on the dial. Multiple repetitions are allowed;

[0016] S1.4, according to the actual adjustment range of the angle of the guide vane, select several angle values ​​to perform angle calibration of the guide vane, take the limit angle displayed on the dial as the reference, record the angle measured by the angular displacement sensor during the upward and downward movement of the hydraulic actuator or the electric actuator, and after confirming that the angle measured by the angular displacement sensor is consistent with the angle displayed on the dial, connect the angular displacement measurement signal of the angular displacement sensor (8-2) to the control system, and monitor the angle of the guide vane in real time in the control system;

[0017] S2, realizing the angular displacement and control method of the rotatable guide vane of the gas turbine compressor;

[0018] S2.1, the control system calculates the relative conversion speed according to the collected compressor physical speed and intake air total temperature, and then obtains the displacement value of the hydraulic actuator or the electric actuator or converts it into the target value of the angle of the switchable guide vane, and adopts the interpolation and fuzzy calculation hybrid control scheme to control the displacement action of the hydraulic actuator or the electric actuator to realize the control of the angle of the switchable guide vane;

[0019] S2.2, during the operation of the hydraulic actuator or electric actuator, the self-check is performed to determine whether the difference between the command angle and the feedback angle of the hydraulic actuator or electric actuator exceeds the limit α or β to determine whether the engine will continue to work, or issue a warning command or a fault alarm command;

[0020] S2.3, the angular displacement sensor transmits the measured actual value of the compressor guide vane angular displacement signal to the gas turbine control system, and the control system compares the difference between the received actual measured angle value and the guide vane angle target value, and controls the guide vane hydraulic system or electric cylinder through the difference signal to achieve linear displacement of the guide vane hydraulic system or electric cylinder, and converts the linear displacement through the guide vane actuator to achieve guide vane angle adjustment, until the compressor guide vane angle measured by the angular displacement sensor and the target value meet the accuracy requirements.

[0021] The beneficial effects of the present invention are as follows: the present invention has a simple and flexible structure, is easy to install and disassemble, and can quickly realize the centering installation of the rotating shaft of the guide vane and the sensing part of the angular displacement sensor. Combined with the guide vane angle control method proposed in the present invention, it can not only improve the real-time control accuracy of the guide vane angle of the gas turbine compressor and eliminate the guide vane angle control error, but also realize the digital control of the guide vane angle of the gas turbine compressor. At the same time, the present invention can also effectively meet the needs of the performance test of the gas turbine compressor components, and can solve the overshoot phenomenon caused by the difference in the installation method of the guide vane actuator and the angular displacement sensor. It also has a good promotion and application value in the performance test of the domestic gas turbine compressor components. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural diagram of the device of the present invention;

[0023] Figure 2 It is a structural diagram of the coupling assembly of the present invention;

[0024] Figure 3 This is a structural diagram of a U-shaped fork connector of the present invention;

[0025] Figure 4 A three-dimensional diagram of the angular displacement sensor assembly of the present invention;

[0026] Figure 5 It is a three-dimensional diagram of the present invention;

[0027] Figure 6 The flow chart of measuring and controlling the angular displacement of the guide vanes of the gas turbine compressor of the present invention;

[0028] Figure 7 The present invention is a flow chart for the installation and commissioning of the adjustable guide vane angle of the gas turbine compressor.

[0029] In the figure: 1. coupling assembly, 2. screw A, 3. self-locking nut, 4. U-shaped fork connector, 5. bracket, 6. screw B, 7. anti-loosening gasket A, 8. angular displacement sensor assembly, 9. fork, 10. rotatable guide vane linkage ring, 11. compressor casing, 12. rotatable guide vane, 8-1. connecting flange, 8-2. angular displacement sensor, 1-1. anti-loosening gasket B, 1-2. screw C, 1-3. cylindrical pin. DETAILED DESCRIPTION

[0030] The present invention is further described below in conjunction with the accompanying drawings.

[0031] like Figure 1 As shown, the angular displacement measuring device of the rotatable guide vane of the gas turbine compressor is installed from bottom to top. First, the U-shaped fork connector 4 is connected to the fork 9 and installed on the rotatable guide vane shaft in a sleeve-type manner. It is fixed to the rotatable guide vane 12 shaft by screw A2 and self-locking nut 3. The U-shaped fork connector 4 and the rotatable guide vane 12 shaft are matched with a small gap, so that the axis of the center hole of the U-shaped fork connector 4 and the rotatable guide vane shaft are located on the same axis. Then, the bracket 5 is installed on the gas turbine casing, and the angular displacement sensor assembly 8 is installed on the bracket 5 by screw B6 and anti-loosening gasket A7. In this process, it is not necessary to tighten the screw B6 and the anti-loosening gasket A7 to ensure that the angular displacement sensor The component 8 can move back and forth on the bracket 5 in a free state. One end of the coupling component 1 is connected to the sensing part of the angular displacement sensor 8-2 and is pressed by screws 1-2 and anti-loosening gasket B1-1. The other end is inserted into the groove of the U-shaped fork connector 4 through a cylindrical pin 1-3. During assembly, the switchable guide vane fork can be repeatedly rotated. The waist-shaped hole on the connecting flange 8-1 of the angular displacement sensor component 8 and the cylindrical pin 1-3 on the coupling component 1 can be adjusted in a small range to ensure that the angular displacement sensor 8-2 is automatically concentric with the switchable guide vane shaft. After the adjustment is completed, tighten the screws B6 and the anti-loosening gasket A7. At this point, the switchable guide vane angular displacement measuring device of the gas turbine compressor is installed.

[0032] Figure 6 In the process, after the gas turbine is given a start command, the gas turbine control system works, the gas turbine starts and is in working condition, and the compressor guide vane angle adopts the "speed control" strategy commonly used in engineering, that is, the compressor speed is used as the control target, and the guide vane angle is used as the control object. The compressor speed signal is fed back to the guide vane actuator in real time, and the angle is continuously changed to achieve the purpose of real-time matching with the compressor speed. This method can ensure a good match between the speed and the guide vane angle under different operating conditions. The corresponding relationship between the compressor's corresponding converted speed and the guide vane angle is provided by the compressor design department or unit. The relationship between the guide vane angle and the displacement of the hydraulic actuator or the electric actuator is determined by the angular displacement sensor 8-2 installation and commissioning ( Figure 7). The control system calculates the relative conversion speed according to the collected compressor physical speed and intake total temperature, and then obtains the displacement value of the hydraulic actuator or electric actuator (or converts it into the target value of the guide vane angle), and adopts the interpolation and fuzzy calculation hybrid control scheme to control the displacement action of the hydraulic actuator or electric actuator to realize the control of the guide vane angle. The hydraulic actuator or electric actuator needs to be self-checked during operation. Whether the difference between the command angle and the feedback angle of the hydraulic actuator or electric actuator exceeds the limit α or β determines whether the engine will continue to work in the next step, or issue a warning instruction or a fault alarm instruction, etc. The angle limit α or β is closely related to the engine compressor acceleration rate and the working capacity of the hydraulic actuator or electric actuator, and needs to be repeatedly explored through experiments. When the guide vane shaft rotates, the sensing part of the angular displacement sensor 8-2 rotates synchronously. The angular displacement sensor 8-2 transmits the measured actual value of the compressor guide vane angular displacement signal to the engine control system. The control system compares the difference between the actual measured angle value received and the target value of the guide vane angle, controls the guide vane hydraulic system or electric cylinder through the difference signal, realizes the linear displacement of the guide vane hydraulic system or electric cylinder, and converts the linear displacement through the guide vane actuator to realize the guide vane angle adjustment, until the compressor guide vane angle measured by the angular displacement sensor 8-2 and the target value meet the accuracy requirements. The entire control process of the guide vane angle is completed by the electronic and mechanical parts, and there are conversions between different types of signals, such as displacement-electricity, speed-electricity and temperature-electricity, etc., and it also involves matching problems between various systems, which is wide-ranging and complex.

[0033] Figure 7 In the embodiment, after the sensing part of the angular displacement sensor 8-2 is installed concentrically with the rotating shaft of the guide vane, the control program of the guide vane angle of the gas turbine control system is debugged, the hydraulic actuator or electric actuator is adjusted, and the relationship between the guide vane angle and the linear displacement of the hydraulic actuator or electric actuator is determined according to the limit angle positions on both sides of the dial. The angle measured by the angular displacement sensor 8-2 is calibrated with the limit angle displayed on the dial as the reference. The measured value of the angular displacement sensor 8-2 is corrected in the control system to make the measured value consistent with the limit angle displayed on the dial. It is allowed to be repeated multiple times. According to the actual adjustment range of the guide vane angle, several angle values ​​are selected to check the guide vane angle. With the limit angle displayed on the dial as the reference, the measured angle of the angular displacement sensor 8-2 during the upward and downward movement of the hydraulic actuator or electric actuator is recorded respectively. After confirming that the measured angle of the angular displacement sensor 8-2 is consistent with the angle displayed on the dial, the angular displacement measurement signal of the angular displacement sensor 8-2 is connected to the control system, and the guide vane angle is monitored in real time in the control system. Both processes require manual reading of the dial.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A device for measuring the angular displacement of a guide vane widely applicable to a gas turbine compressor, characterized in that: The invention comprises a coupling assembly (1), a U-shaped fork connector (4), a bracket (5) and an angular displacement sensor assembly (8); the U-shaped fork connector (4) is connected to a shift fork (9) and is fixedly mounted on a rotating shaft of a rotatable guide vane (12) by means of a sleeve connection; the bracket (5) is mounted on a compressor casing (11); and the angular displacement sensor assembly (8) is mounted on the bracket (5).

2. The device for measuring the angular displacement of guide vanes widely applicable to gas turbine compressors according to claim 1, characterized in that: The angular displacement sensor assembly (8) comprises a connecting flange (8-1) and an angular displacement sensor (8-2); one end of the coupling assembly (1) is connected to the sensing part of the angular displacement sensor (8-2) and is compressed by means of a screw C (1-2) and a locking gasket B (1-1), and the other end is inserted into a groove of a U-shaped fork connector (4) via a cylindrical pin (1-3).

3. The device for measuring the angular displacement of guide vanes widely applicable to gas turbine compressors according to claim 2, characterized in that: The U-shaped fork connector (4) has a certain elasticity and forms a flexible coupling with the coupling assembly (1), which buffers the force on the angular displacement sensor (8-2) and plays a role in protecting the angular displacement sensor (8-2).

4. The device for measuring the angular displacement of guide vanes widely applicable to gas turbine compressors according to claim 1, characterized in that: The U-shaped fork connector (4) and the shift fork (9) are fixed on the rotating shaft of the rotatable guide vane (12) by means of screws A (2) and self-locking nuts (3).

5. The device for measuring the angular displacement of guide vanes widely applicable to gas turbine compressors according to claim 1, characterized in that: The U-shaped fork connector (4) and the rotating shaft of the rotatable guide vane are matched with a small gap, so that the axis of the central hole of the U-shaped fork connector (4) and the rotating shaft of the rotatable guide vane (12) are located on the same axis.

6. The device for measuring the angular displacement of guide vanes widely applicable to gas turbine compressors according to claim 1, characterized in that: The angular displacement sensor assembly (8) is mounted on the bracket (5) via screws B (6) and anti-loosening washers A (7).

7. A measuring method for the angular displacement measuring device of a rotatable guide vane widely applicable to a gas turbine compressor according to claim 3, characterized in that: The following steps are involved: S1, installation and commissioning of the angular displacement device of the guide vane; S1.1, after the sensing part of the angular displacement sensor (8-2) is installed concentrically with the rotating shaft of the rotatable guide vane, the angle control program of the rotatable guide vane (12) of the gas turbine control system is debugged; S1.2, adjusting the hydraulic actuator or the electric actuator, according to the extreme angle positions on both sides of the dial, determining the relationship between the angle of the rotatable guide vane (12) and the linear displacement of the hydraulic actuator or the electric actuator; S1.3, calibrate the angle measured by the angular displacement sensor (8-2) with the limit angle displayed on the dial as a reference, and correct the measured value of the angular displacement sensor (8-2) in the control system so that the measured value is consistent with the limit angle displayed on the dial, and multiple repetitions are allowed; S1.4, according to the actual adjustment range of the angle of the switchable guide vane (12), select a number of angle values ​​to perform angle calibration of the switchable guide vane (12), take the limit angle displayed on the dial as a reference, respectively record the angle measured by the angular displacement sensor (8-2) during the upward and downward movement of the hydraulic actuator or the electric actuator, after confirming that the angle measured by the angular displacement sensor (8-2) is consistent with the angle displayed on the dial, connect the angular displacement measurement signal of the angular displacement sensor (8-2) to the control system, and monitor the angle of the switchable guide vane in real time in the control system; S2, realizing the angular displacement and control method of the rotatable guide vane of the gas turbine compressor; S2.1, the control system calculates the relative conversion speed according to the collected compressor physical speed and intake air total temperature, and then obtains the displacement value of the hydraulic actuator or the electric actuator or converts it into a target value of the angle of the switchable guide vane, and adopts an interpolation and fuzzy calculation hybrid control scheme to control the displacement action of the hydraulic actuator or the electric actuator to achieve the angle control of the switchable guide vane (12); S2.2, during the operation of the hydraulic actuator or electric actuator, the self-check is performed to determine whether the difference between the command angle and the feedback angle of the hydraulic actuator or electric actuator exceeds the limit α or β to determine whether the engine will continue to work, or issue a warning command or a fault alarm command; S2.3, the angular displacement sensor (8-2) transmits the measured actual value of the compressor guide vane angular displacement signal to the engine control system, and the control system compares the difference between the received actual measured angle value and the angle target value of the guide vane (12), controls the guide vane hydraulic system or electric cylinder through the difference signal, realizes the linear displacement of the guide vane hydraulic system or electric cylinder, and converts the linear displacement through the guide vane actuator to realize the guide vane angle adjustment, until the compressor guide vane angle measured by the angular displacement sensor (8-2) and the target value meet the accuracy requirements.

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