A widely applicable variable guide vane angle displacement measuring device and measuring method for a gas turbine compressor

Abstract

The present application relates to a kind of gas turbine compressor widely applicable variable guide vane angle displacement measuring device and measuring method, during the working process of gas turbine, with the action of variable guide vane actuator and the rotation of variable guide vane, gas turbine control system calculates variable guide vane angle target value according to the total temperature of inlet air and compressor actual speed, angle displacement sensor real-time measurement variable guide vane angle value, the measured angle is fed back to gas turbine control system, and difference comparison is carried out with variable guide vane angle target value, gas turbine control system adjusts the size of variable guide vane angle of compressor through difference signal real-time, to change import air flow, to adapt to the best operating line of compressor, ensure the working margin of compressor.The device and method have wide application value, can be applied in compressor, turbine, steam turbine and axial flow fan etc.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of gas turbine compressor equipment, and particularly relates to a widely applicable variable guide vane angle displacement measuring device and measuring method for a gas turbine compressor. BACKGROUND

[0002] The compressor is one of the most important components of a gas turbine, and the performance of the component determines the overall performance index of the gas turbine to a great extent. In order to make the compressor have good performance in a wide working range, a modern gas turbine is generally provided with variable guide vanes and a corresponding angle adjusting mechanism, so that the compressor rotor works in a smaller attack angle range by adjusting the angle of the variable guide vanes.

[0003] In order to improve the control precision and real-time performance of the variable guide vane angle, most of the domestic and foreign gas turbine compressors currently adopt an angle displacement sensor as a measuring device for adjusting the angle of the variable guide vanes, and the angle of the variable guide vanes is taken as an important state control parameter of the gas turbine compressor. The currently disclosed variable guide vane angle displacement measuring device has the following shortcomings: 1) some measuring devices are relatively complex, have many parts, and are time-consuming to install, and are not easy to operate; 2) some measuring devices require the variable guide vane shaft to have a connecting structure connected with the measuring device; and 3) some measuring devices have a large size and are difficult to use in a small space. SUMMARY

[0004] The present application aims to solve the problems of poor adaptability and low automation of the variable guide vane angle displacement measuring device for a gas turbine compressor, and provides a widely applicable variable guide vane angle displacement measuring device and measuring method for a gas turbine compressor.

[0005] A widely applicable variable guide vane angle displacement measuring device for a gas turbine compressor comprises a shaft coupling assembly, a U-shaped fork connecting piece, a bracket, and an angle displacement sensor assembly; the U-shaped fork connecting piece is connected with a yoke and is fixedly installed on a variable guide vane shaft through sleeve connection; the bracket is installed on a compressor casing; and the angle displacement sensor assembly is installed on the bracket.

[0006] Further, the angle displacement sensor assembly comprises a connecting flange and an angle displacement sensor; one end of the shaft coupling assembly is connected with a sensing part of the angle displacement sensor and is compressed by a screw C and a lock washer B, and the other end is inserted into a groove in the U-shaped fork connecting piece through a cylindrical pin.

[0007] Further, the U-shaped fork connecting piece has a certain elasticity, and forms a flexible coupling with the shaft coupling assembly, buffers the force on the angle displacement sensor, and plays a role in protecting the angle displacement sensor.

[0008] Further, the U-shaped fork connecting piece and the yoke are fixedly installed on the variable guide vane shaft through a screw A and a self-locking nut.

[0009] Further, the U-shaped fork connector is matched with the small gap of the rotatable guide vane rotating shaft, so that the axis of the center hole of the U-shaped fork connector is on the same axis as the rotatable guide vane rotating shaft.

[0010] Further, the angular displacement sensor assembly is installed on the bracket through the screw B and the lock washer A.

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

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

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

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

[0015] S1.3, taking the limit angle displayed by the dial as a reference, the angular displacement sensor measurement angle is calibrated, and the angular displacement sensor measurement value is corrected in the control system to make the measurement value consistent with the limit angle displayed by the dial, which allows repeated calibration;

[0016] S1.4, according to the actual adjustment range of the rotatable guide vane angle, a plurality of angle values are selected for rotatable guide vane angle calibration, taking the limit angle displayed by the dial as a reference, the angular displacement sensor measurement angle is recorded during the upward and downward movement of the hydraulic actuator or the electric actuator, and after confirming that the angular displacement sensor measurement angle is consistent with the dial display angle, the angular displacement measurement signal of the angular displacement sensor (8-2) is connected to the control system, and the rotatable guide vane angle is monitored in real time in the control system;

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

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

[0019] S2.2, self-checking during the operation of the hydraulic actuator or the electric actuator, whether the difference between the command angle and the feedback angle of the hydraulic actuator or the electric actuator exceeds the limit value alpha or beta to determine whether the gas turbine continues to work next, or issues a warning instruction or a fault alarm instruction;

[0020] S2.3, the angle displacement sensor transmits the measured compressor variable guide vane angle displacement signal actual value to the gas turbine control system, the control system compares the received actual measurement angle value with the variable guide vane angle target value, controls the variable guide vane hydraulic system or the electric cylinder through the difference value signal, realizes the linear displacement of the variable guide vane hydraulic system or the electric cylinder, and realizes the variable guide vane angle adjustment through the linear displacement conversion of the variable guide vane actuator until the compressor variable guide vane angle measured by the angle displacement sensor meets the accuracy requirement.

[0021] The beneficial effects of the present application are that the present application has simple structure, flexibility, is convenient to install and disassemble, and can realize the centering installation of the variable guide vane rotating shaft and the sensing part of the angle displacement sensor quickly. In combination with the variable guide vane angle control method provided by the present application, not only the real-time control accuracy of the gas turbine compressor variable guide vane angle can be improved, the variable guide vane angle control error can be eliminated, but also the digital control of the gas turbine compressor variable guide vane angle can be realized. At the same time, the present application 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 between the installation modes of the variable guide vane actuator and the angle displacement sensor, and has good popularization and application value in the performance test of the gas turbine compressor components in China. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is the device structure diagram of the present application;

[0023] Figure 2 It is the coupling assembly structure diagram of the present application;

[0024] Figure 3 It is the U-shaped fork connecting piece structure diagram of the present application;

[0025] Figure 4 It is the three-dimensional diagram of the angle displacement sensor assembly of the present application;

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

[0027] Figure 6 It is the variable guide vane angle displacement measurement and control flow chart of the gas turbine compressor of the present application;

[0028] Figure 7 It is the variable guide vane angle installation and debugging flow chart of the gas turbine compressor of the present application.

[0029] In the diagram: 1. Coupling assembly, 2. Screw A, 3. Self-locking nut, 4. U-shaped fork connector, 5. Bracket, 6. Screw B, 7. Anti-loosening washer A, 8. Angular displacement sensor assembly, 9. Shift 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 washer B, 1-2. Screw C, 1-3. Cylindrical pin. Detailed Implementation

[0030] The present invention will now be further described with reference to the accompanying drawings.

[0031] like Figure 1 As shown, the angular displacement measuring device for the rotatable guide vane of the gas turbine compressor adopts a bottom-up installation method. First, the U-shaped fork connector 4 is connected to the shift fork 9 and installed on the rotatable guide vane shaft in a sleeve manner. It is then tightened and fixed to the rotatable guide vane shaft by screw A2 and self-locking nut 3. The U-shaped fork connector 4 and the rotatable guide vane shaft have a small clearance fit, which ensures that the axis of the center hole of the U-shaped fork connector 4 is on the same axis as the rotatable guide vane shaft. Next, the bracket 5 is installed on the gas turbine casing. The angular displacement sensor assembly 8 is installed on the bracket 5 by screw B6 and anti-loosening washer A7. During this process, it is not necessary to tighten screw B6 and anti-loosening washer A7 to ensure the angular displacement sensor... Component 8 can move back and forth on bracket 5 in a free state. One end of coupling assembly 1 is connected to the sensing part of angular displacement sensor 8-2 and pressed with screw 1-2 and anti-loosening washer B1-1. The other end is inserted into the groove of U-shaped fork connector 4 through cylindrical pin 1-3. During assembly, the rotatable guide vane fork can be rotated repeatedly. By adjusting the oblong hole on the flange 8-1 of angular displacement sensor assembly 8 and the cylindrical pin 1-3 on coupling assembly 1 within a small range, the angular displacement sensor 8-2 and the rotatable guide vane shaft can be automatically concentric. After adjustment, tighten screw B6 and anti-loosening washer A7. At this point, the angular displacement measuring device of rotatable guide vane of gas turbine compressor is installed.

[0032] Figure 6 In the process, after the gas turbine receives the start command, the gas turbine control system activates, the gas turbine starts and enters the working state. The compressor's rotatable guide vane angle employs the currently common "speed control" strategy, where the compressor speed is the control target and the rotatable guide vane angle is the control object. The compressor speed signal is fed back to the rotatable guide vane actuator in real time. By continuously changing the angle, real-time matching with the compressor speed is achieved. This method ensures good matching between the speed and the rotatable guide vane angle under different operating conditions. The corresponding relationship between the compressor's calculated speed and the rotatable guide vane angle is provided by the compressor design department or unit. The relationship between the rotatable guide vane angle and the displacement of the hydraulic or electric actuator is determined by the angular displacement sensor 8-2 during installation and commissioning. Figure 7) is determined. The control system calculates the relative conversion speed according to the collected compressor physical rotating speed and the total temperature of the intake air, and then obtains the displacement value of the hydraulic actuator or the electric actuator (or the target value of the conversion guide vane angle), adopts the mixed control scheme of interpolation and fuzzy calculation to control the displacement action of the hydraulic actuator or the electric actuator, and realizes the conversion guide vane angle control. The hydraulic actuator or the electric actuator needs to be self-checked during the operation process, and whether the next step of the gas turbine continues to work or the pre-warning instruction or the fault alarm instruction is sent is determined according to whether the difference between the instruction angle and the feedback angle of the hydraulic actuator or the electric actuator exceeds the limit value α or β. The angle limit value α or β is closely related to the compressor speed-up rate of the gas turbine and the working capacity of the hydraulic actuator or the electric actuator, and needs to be repeatedly explored through experiments. When the conversion guide vane rotating shaft rotates, the receiving part of the angle displacement sensor 8-2 rotates synchronously. The angle displacement sensor 8-2 transmits the measured actual value of the compressor conversion guide vane angle displacement signal to the gas turbine control system. The control system compares the received actual measured angle value with the conversion guide vane angle target value, controls the conversion guide vane hydraulic system or the electric cylinder through the difference value signal, realizes the linear displacement of the conversion guide vane hydraulic system or the electric cylinder, converts the linear displacement through the conversion guide vane actuator, and thus realizes the conversion guide vane angle adjustment, until the compressor conversion guide vane angle measured by the angle displacement sensor 8-2 meets the accuracy requirement. The whole conversion guide vane angle control process is completed by the electronic and mechanical parts together, and there is a conversion between different types of signals, such as displacement-electricity, rotating speed-electricity and temperature-electricity, and meanwhile, the matching problem between the systems is involved, which has a wide range and complex content.

[0033] Figure 7 In the conversion guide vane angle control process, the receiving part of the angle displacement sensor 8-2 is concentrically installed with the conversion guide vane rotating shaft, the conversion guide vane angle control program of the gas turbine control system is debugged, the hydraulic actuator or the electric actuator is adjusted, the relationship between the conversion guide vane angle and the linear displacement of the hydraulic actuator or the electric actuator is determined according to the limit angle positions on both sides of the dial, the angle measured by the angle displacement sensor 8-2 is calibrated based on the limit angle displayed by the dial, the measured value of the angle displacement sensor 8-2 is corrected in the control system so as to be consistent with the limit angle displayed by the dial, and the angle measured by the angle displacement sensor 8-2 is recorded in the uplink and downlink processes of the hydraulic actuator or the electric actuator respectively based on the limit angle displayed by the dial. After it is confirmed that the angle measured by the angle displacement sensor 8-2 is consistent with the angle displayed by the dial, the angle displacement measurement signal of the angle displacement sensor 8-2 is connected to the control system, and the conversion guide vane angle is monitored in real time in the control system. Both the processes need to be read by the dial by artificial method.

[0034] The above merely provides the preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the principles and technical scope of the present application shall fall into the scope of the present application.

Claims

1. A widely applicable, variable blade angle displacement measuring device for a gas turbine compressor characterized by, The application relates to a flexible joint assembly for a gas turbine compressor, which comprises a joint assembly (1), a U-shaped fork joint (4), a support (5) and an angular displacement sensor assembly (8); the U-shaped fork joint (4) is connected with a shifting fork (9) and is fixedly installed on a rotating shaft of a rotatable vane (12) through sleeve joint; the support (5) is installed on a compressor casing (11); and the angular displacement sensor assembly (8) is installed on the support (5). The angular displacement sensor assembly (8) comprises a connecting flange (8-1) and an angular displacement sensor (8-2); one end of the joint assembly (1) is connected with a sensing part of the angular displacement sensor (8-2) and is compressed by a screw C (1-2) and a lock washer B (1-1); and the other end is inserted into a groove in the U-shaped fork joint (4) through a cylindrical pin (1-3).

2. A universally applicable, rotatable vane angle displacement measuring device for a gas turbine compressor according to claim 1, characterized in that The U-shaped fork joint (4) has a certain elasticity, forms a flexible joint with the joint assembly (1), buffers the force on the angular displacement sensor (8-2) and protects the angular displacement sensor (8-2).

3. A universally applicable, rotatable vane angle displacement measuring device for a gas turbine compressor according to claim 1, characterized in that The U-shaped fork joint (4) and the shifting fork (9) are fixedly connected on the rotating shaft of the rotatable vane (12) through a screw A (2) and a self-locking nut (3).

4. A universally applicable, rotatable vane angle displacement measuring device for a gas turbine compressor according to claim 1, characterized in that The U-shaped fork joint (4) and the rotating shaft of the rotatable vane are in small-gap fit, so that the central hole axis of the U-shaped fork joint (4) is located on the same axis as the rotating shaft of the rotatable vane (12).

5. A universally applicable, rotatable vane angle displacement measuring device for a gas turbine compressor according to claim 1, characterized in that The angular displacement sensor assembly (8) is installed on the support (5) through a screw B (6) and a lock washer A (7).

6. A method of measuring the displacement of a variable guide vane angle of a gas turbine compressor according to the broadly applicable variable guide vane angle displacement measuring device of claim 1, characterized in that, The application further discloses a method for adjusting the flexible joint assembly. S1, installing and adjusting the rotatable vane angular displacement device; S1.1, after the sensing part of the angular displacement sensor (8-2) is concentrically installed on the rotating shaft of the rotatable vane, the angle control program of the gas turbine control system is debugged; S1.2, the hydraulic or electric actuator is adjusted according to the limit angle positions on both sides of the scale dial to determine the relationship between the angle of the rotatable vane (12) and the linear displacement of the hydraulic or electric actuator; S1.3, the measurement angle of the angular displacement sensor (8-2) is calibrated according to the limit angle displayed by the scale dial, and the measurement value of the angular displacement sensor (8-2) is corrected in the control system so as to be consistent with the limit angle displayed by the scale dial, and the calibration can be repeated for several times; S1.4, according to the actual adjustment range of the angle of the rotatable vane (12), a plurality of angle values are selected to verify the angle of the rotatable vane (12), and the measurement angle of the angular displacement sensor (8-2) is recorded during the upstroke and downstroke of the hydraulic or electric actuator respectively according to the limit angle displayed by the scale dial; after the measurement angle of the angular displacement sensor (8-2) is confirmed to be consistent with the angle displayed by the scale dial, the angular displacement measurement signal of the angular displacement sensor (8-2) is connected to the control system, and the angle of the rotatable vane is monitored in real time in the control system; S2, realizing the rotatable vane angular displacement and control method of the gas turbine compressor. S2.1, the control system calculates the relative conversion speed according to the collected compressor physical speed and the total temperature of the intake air, and then obtains the displacement value of the hydraulic actuator or the electric actuator or converts it into the target value of the rotatable guide vane angle, adopts the mixed control scheme of interpolation and fuzzy calculation to control the displacement action of the hydraulic actuator or the electric actuator, and realizes the angle control of the rotatable guide vane (12); S2.2, during the operation of the hydraulic actuator or the electric actuator, whether the next step of the gas turbine continues to work or a pre-warning instruction or a fault alarm instruction is sent is determined according to whether the difference between the instruction angle and the feedback angle of the hydraulic actuator or the electric actuator exceeds the limit value α or β; S2.3, the angle displacement sensor (8-2) transmits the measured actual value of the compressor rotatable guide vane angle displacement signal to the gas turbine control system, the control system compares the received actual measured angle value with the target value of the rotatable guide vane (12) angle, controls the rotatable guide vane hydraulic system or the electric cylinder through the difference value signal, realizes the linear displacement of the rotatable guide vane hydraulic system or the electric cylinder, converts the linear displacement through the rotatable guide vane actuator to realize the angle adjustment of the rotatable guide vane, until the compressor rotatable guide vane angle measured by the angle displacement sensor (8-2) meets the accuracy requirement.

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