Monitoring device for independent intelligent low-oil-pressure tripping protection test of steam turbine

Abstract

The invention discloses a monitoring device for an independent intelligent low-oil-pressure tripping protection test of a steam turbine, relates to a monitoring device for an oil system of a steam turbine generator unit, and aims to solve the problem that the existing tripping protection device is not maintained in time and is easy to cause non-stop accidents of the unit. A pipe joint is connected between a main pipe and an oil inlet stop valve; the oil inlet stop valve is communicated with the throttler; the throttler is communicated with the electromagnetic valve; an oil outlet of the electromagnetic valve is connected back to the main pipe; the pressure transmitter is used for monitoring the pressure of a pipeline between the throttler and the electromagnetic valve; the acquisition card controller is connected with the pressure transmitter; the acquisition card controller compares a preset pressure threshold value with the pressure sensing signal, and generates an interrupt control signal when the pressure sensing signal is greater than the preset pressure threshold value; and the control signal output end of the acquisition card controller is connected with the control signal input end of the electromagnetic valve. The beneficial effects are that the device operation state monitoring is added, and the device health state on-line monitoring capability is improved.

Description

Technical Field

[0001] The invention relates to a monitoring device for an oil system of a steam turbine generator set. Background Art

[0002] At present, most of the low oil pressure tripping protection devices of steam turbine generator sets are integrated together. The main purpose is to protect the steam turbine generator set from oil system failure. The device can timely trip the unit for protection, and at the same time, it has the function of performing online tripping protection test without affecting the operation of the unit. However, the existing tripping protection devices do not have online intelligent monitoring function, which often leads to failure of the solenoid valve or throttle, or oil leakage, which may cause the unit to have an unstoppable accident due to maintenance or untimely discovery, posing a major hidden danger to the safe operation of the unit. Summary of the invention

[0003] The purpose of the present invention is to solve the problem that the untimely maintenance of the existing tripping protection device may easily lead to an unstoppable accident of the unit, and a monitoring device for an independent intelligent low oil pressure tripping protection test of a steam turbine is proposed.

[0004] The present invention discloses a monitoring device for a steam turbine independent intelligent low oil pressure tripping protection test, the monitoring device comprising N groups of independent units and an intelligent control box;

[0005] The structures of the N groups of independent units are all the same, and each group of independent units is used to independently sample the main pipe of the steam turbine generator oil system; N is an integer greater than 2;

[0006] Each independent unit includes a throttle, a pipe joint, an oil inlet stop valve, a solenoid valve and a pressure transmitter;

[0007] One end of the pipe joint is used as a sampling connection end of the main pipe of the steam turbine generator oil system; the other end of the pipe joint is connected to one end of the oil inlet stop valve; the other end of the oil inlet stop valve is connected to the oil inlet end of the throttle; the oil outlet end of the throttle is connected to the oil inlet port of the solenoid valve; the oil outlet port of the solenoid valve is used as a return connection end of the main pipe of the steam turbine generator oil system;

[0008] The pressure transmitter is used to monitor the pressure of the pipeline between the throttle and the solenoid valve;

[0009] An acquisition card controller is provided in the intelligent control box; a pressure sensing signal input end of the acquisition card controller is connected to a pressure sensing signal output end of the pressure transmitter; the acquisition card controller compares the pressure sensing signal with a preset pressure threshold, and generates an interrupt control signal when the pressure sensing signal is greater than the preset pressure threshold; the interrupt control signal output end of the acquisition card controller is connected to an interrupt control signal input end of the solenoid valve.

[0010] Furthermore, each group of independent units also includes an integrated block;

[0011] The throttle and the pipe joint are both arranged on the front side wall of the integrated block;

[0012] The oil inlet stop valve and the solenoid valve are both arranged on the top surface of the integrated block;

[0013] The pipeline connected to the pressure transmitter is led out from the left side wall, the right side wall or the rear side wall of the integrated block.

[0014] Furthermore, each group of independent units also includes an instrument stop valve;

[0015] The instrument stop valve is installed on the pipeline between the pressure transmitter and the integrated block.

[0016] Furthermore, each group of independent units also includes an oil return stop valve;

[0017] The oil return stop valve is arranged on the top surface of the integrated block, and one end of the oil return stop valve is connected to the oil outlet end of the throttle; the other end of the oil return stop valve serves as the return connection end of the main pipe of the steam turbine generator oil system.

[0018] Furthermore, each group of independent units also includes a mounting bracket;

[0019] The mounting bracket includes a base and a back plate;

[0020] The back plate is fixed on the base;

[0021] The integrated block is fixed on the base of the mounting bracket;

[0022] The intelligent control box is fixed on the back side of the back plate.

[0023] Furthermore, each group of independent units also includes an oil leakage monitoring oil pan and an oil sensor;

[0024] The oil leakage monitoring oil pan is arranged between the integrated block and the base of the bracket;

[0025] The oil sensor is installed in the oil leakage monitoring oil pan, and the oil sensor signal output end of the oil sensor is connected to the oil sensor signal input end of the acquisition card controller in the intelligent control box.

[0026] Furthermore, each group of independent units also includes a patch-type temperature sensor;

[0027] The patch temperature sensor is arranged on the pipe joint; the temperature sensing signal output end of the patch temperature sensor is connected to the temperature sensing signal input end of the acquisition card controller in the intelligent control box.

[0028] Furthermore, N is equal to three, and the acquisition card controller in the intelligent control box adopts a two-out-of-three protection logic.

[0029] Furthermore, the intelligent control box is provided with a remote transmission interface;

[0030] The remote transmission interface is used to transmit the pressure sensor signal acquired by the acquisition card in the intelligent control box to the DCS system of the generator set and the mobile phone user terminal.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. The present invention is a new independent intelligent low oil pressure tripping protection monitoring device. In addition to monitoring the main pressure of the generator set tripping protection oil system, it also adds the status monitoring of the device itself, thereby improving the online monitoring capability of the device's own health status.

[0033] 2. The present invention can perform online fault analysis on the low oil pressure tripping protection device through the acquisition card controller provided in the intelligent control box, and provide online maintenance measures to avoid the generator set from accidentally tripping due to the fault of the low oil pressure tripping protection device itself.

[0034] 3. The present invention also has a signal remote transmission interface, which can not only perform independent intelligent monitoring but also remotely transmit the signal to the DCS system and mobile phone user terminal of the generator set to achieve real-time data sharing for online monitoring by operation and maintenance personnel.

[0035] 4. The present invention is easy to install, and the independent integrated device is convenient for the unit to meet the sampling position requirements of the trip protection device, saves the number of sampling pipelines, and is reasonable and beautiful.

[0036] 5. The present invention reduces the daily inspection work of maintenance personnel and truly realizes intelligent online monitoring and operation and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a front view of a monitoring device for independent intelligent low oil pressure tripping protection test of a steam turbine according to the first specific implementation mode;

[0038] Figure 2 It is a side view of a monitoring device for independent intelligent low oil pressure tripping protection test of a steam turbine according to the first specific implementation mode;

[0039] Figure 3 It is a top view of a monitoring device for independent intelligent low oil pressure tripping protection test of a steam turbine described in the first embodiment without the pressure transmitter;

[0040] Figure 4 It is a working principle diagram of a monitoring device for independent intelligent low oil pressure tripping protection test of a steam turbine described in the first specific implementation mode;

[0041] Figure 5 This is a control strategy flow chart of the acquisition card controller in the seventh specific implementation mode.

[0042] Among them, 1 is the mounting bracket; 2 is the integrated block; 3 is the throttle; 4 is the pipe joint; 5 is the oil inlet stop valve; 6 is the oil return stop valve; 7 is the solenoid valve; 8 is the instrument stop valve; 9 is the pressure transmitter; 10 is the intelligent control box; 11 is the oil leakage monitoring oil pan; 12 is the oil sensor; 13 is the chip temperature sensor. DETAILED DESCRIPTION

[0043] Specific implementation method 1. Combination Figures 1 to 4 This embodiment is described as a monitoring device for an independent intelligent low oil pressure tripping protection test of a steam turbine, the monitoring device comprising N groups of independent units and an intelligent control box 10;

[0044] The structures of the N groups of independent units are all the same, and each group of independent units is used to independently sample the main pipe of the steam turbine generator oil system; N is an integer greater than 2;

[0045] Each independent unit includes a throttle 3, a pipe joint 4, an oil inlet stop valve 5, a solenoid valve 7 and a pressure transmitter 9;

[0046] One end of the pipe joint 4 is used as a sampling connection end of the main pipe of the steam turbine generator oil system; the other end of the pipe joint 4 is connected to one end of the oil inlet stop valve 5; the other end of the oil inlet stop valve 5 is connected to the oil inlet end of the throttle 3; the oil outlet end of the throttle 3 is connected to the oil inlet port of the solenoid valve 7; the oil outlet port of the solenoid valve 7 is used as a return connection end of the main pipe of the steam turbine generator oil system;

[0047] The pressure transmitter 9 is used to monitor the pressure of the pipeline between the throttle 3 and the solenoid valve 7;

[0048] The intelligent control box 10 is provided with an acquisition card controller; the pressure sensing signal input end of the acquisition card controller is connected to the pressure sensing signal output end of the pressure transmitter 9; the acquisition card controller compares the pressure sensing signal with the preset pressure threshold, and generates an interrupt control signal when the pressure sensing signal is greater than the preset pressure threshold; the interrupt control signal output end of the acquisition card controller is connected to the interrupt control signal input end of the solenoid valve 7.

[0049] In this embodiment, the monitoring device is provided with three independent sampling points, namely HP1, HP2, and HP3. The oil from the main oil circuit HP1 passes through the oil inlet stop valve 5 and the throttle 3. The pressure transmitters 9 (PT1, PT2, PT3) are responsible for monitoring the three oil pressure values, which can be displayed online and transmitted remotely. The operating pressure of the conventional generator set is 14MPa. Once the main oil pressure is lower than the unit trip value of 10MPa, the pressure transmitter 9 transmits the pressure signal remotely to the unit DCS control system to control ETS for trip protection. Therefore, the preset pressure threshold is 10MPa. The solenoid valve S V1, solenoid valve SV2, and solenoid valve SV3 are in a normally closed state when the unit is running, and are mainly used for online remote tripping protection tests; when the test is carried out, if the solenoid valve 7 is opened, the pressure transmitter 9 will transmit the pressure sensor signal to the acquisition card of the intelligent control box 10, and the acquisition card will transmit the pressure sensor signal to the acquisition card controller. If the acquisition card controller determines that the pressure sensor signal transmitted by the acquisition card is lower than the preset pressure threshold, the acquisition card controller will control the solenoid valve 7 to automatically close, thereby realizing the tripping protection test function; and, due to the presence of the throttle 3 during tripping, the main oil pressure operating pressure will not change.

[0050] The monitoring device described in this embodiment performs independent sampling in the main pipe in the oil system through an independent unit, and uses the pressure transmitter 9 to monitor the main pipe pressure in the oil system in real time. Once any fault occurs in the oil system and the pressure is lower than the preset pressure threshold (the operating pressure trip value of the generator set), the solenoid valve 7 is triggered to automatically close (the unit trips), thereby realizing the safety protection of the unit. At the same time, under the premise of normal operation of the unit, the basic functions of the remote online trip protection test can be realized, and the fault health diagnosis system and operation maintenance functions of the intelligent monitoring of the real-time status of the trip device are combined. The independent unit of this embodiment collects various monitoring signals through different types of sensors, uses the integrated acquisition card controller to collect signals and displays the operating status of the equipment in real time on the display interface, which can not only realize the trip protection of the unit, but also intelligently diagnose the fault analysis of the trip protection device, so as to ensure timely online maintenance, ensure the safe operation of the unit, and improve the reliability of the unit.

[0051] Specific implementation method 2: This implementation method further limits the monitoring device for independent intelligent low oil pressure tripping protection test of a steam turbine described in specific implementation method 1. In this implementation method, each group of independent units further includes an integrated block 2;

[0052] The throttle 3 and the pipe joint 4 are both arranged on the front side wall of the integrated block 2;

[0053] The oil inlet stop valve 5 and the solenoid valve 7 are both arranged on the top surface of the integrated block 2;

[0054] The pipeline connected to the pressure transmitter 9 is led out from the left side wall, the right side wall or the rear side wall of the integrated block 2 .

[0055] In this embodiment, the throttle 3, the pipe joint 4, the oil inlet stop valve 5 and the solenoid valve 7 are all arranged together through the integrated block 2, which saves the number of sampling pipelines, is easy to install, and is reasonable and beautiful.

[0056] Specific implementation method 3: This implementation method further limits the monitoring device for independent intelligent low oil pressure tripping protection test of steam turbine described in specific implementation method 2. In this implementation method, each group of independent units further includes an instrument stop valve 8;

[0057] The instrument stop valve 8 is installed on the pipeline between the pressure transmitter 9 and the integrated block 2.

[0058] In this embodiment, the instrument stop valve 8 is added to facilitate maintenance or replacement; at the same time, the instrument stop valve 8 facilitates the adjustment and control of the pressure transmitter 9 to prevent the pressure transmitter 9 from being damaged.

[0059] Specific implementation method 4: This implementation method further limits the monitoring device for independent intelligent low oil pressure tripping protection test of a steam turbine described in specific implementation method 2. In this implementation method, each group of independent units further includes an oil return stop valve 6;

[0060] The oil return stop valve 6 is arranged on the top surface of the integrated block 2, and one end of the oil return stop valve 6 is connected to the oil outlet end of the throttle 3; the other end of the oil return stop valve 6 serves as the return connection end of the main pipe of the steam turbine generator oil system.

[0061] In this embodiment, the return oil stop valve 6 and the solenoid valve 7 are in a parallel relationship. By adding the return oil stop valve 6, the basic function of manual online tripping test is provided. The return oil stop valve 6 is in a normally closed state. When the test is carried out, the return oil stop valve 6 is opened, and the pressure transmitter 9 transmits the pressure sensor signal to the acquisition card of the intelligent control box 10. The acquisition card transmits the pressure sensor signal to the acquisition card controller, displays the corresponding value and issues the corresponding alarm prompt. The return oil stop valve 6 is manually closed to realize the tripping protection test function.

[0062] Specific implementation method 5: This implementation method further limits the monitoring device for independent intelligent low oil pressure tripping protection test of a steam turbine described in specific implementation method 2. In this implementation method, each group of independent units further includes a mounting bracket 1;

[0063] The mounting bracket 1 comprises a base and a back plate;

[0064] The back plate is fixed on the base;

[0065] The integrated block 2 is fixed on the base of the mounting bracket 1;

[0066] The intelligent control box 10 is fixed on the back side of the back plate.

[0067] In this embodiment, by adding the mounting bracket 1, the monitoring device can be easily moved and the values ​​can be observed.

[0068] Specific implementation method 6: This implementation method further defines the monitoring device for independent intelligent low oil pressure tripping protection test of a steam turbine described in specific implementation method 2. In this implementation method, each group of independent units further includes an oil leakage monitoring oil pan 11 and an oil sensor 12;

[0069] The oil leakage monitoring oil pan 11 is arranged between the integrated block 2 and the base of the bracket 1;

[0070] The oil sensor 12 is installed in the oil leakage monitoring oil pan 11 , and the oil sensor signal output end of the oil sensor 12 is connected to the oil sensor signal input end of the acquisition card controller in the intelligent control box 10 .

[0071] In this embodiment, an oil leakage monitoring oil pan 11 and oil sensors 12 are added. There are four oil sensors 12, which are respectively arranged at four corners of the oil leakage monitoring oil pan 11 to monitor the real-time oil leakage situation of the monitoring device.

[0072] Specific implementation method VII. Combination Figure 5 This embodiment is described. This embodiment further limits the monitoring device for independent intelligent low oil pressure tripping protection test of a steam turbine described in the sixth embodiment. In this embodiment, each group of independent units further includes a patch temperature sensor 13;

[0073] The chip temperature sensor 13 is arranged on the pipe joint 4 ; the temperature sensing signal output end of the chip temperature sensor 13 is connected to the temperature sensing signal input end of the acquisition card controller in the intelligent control box 10 .

[0074] In this embodiment, by adding a patch temperature sensor 13 to the oil inlet pipeline HP1, HP2, HP3 and the oil return pipeline DV to monitor the corresponding pipeline temperature, combined with the patch temperature sensor 13, the control strategy of the acquisition card controller is as shown in Figure 5. Figure 5The sensor acquisition signals include temperature signals collected by 4 SMD temperature sensors 13, liquid level signals from 4 oil sensors 12, and pressure signals from 3 pressure transmitters 9; the sensor acquisition signals are transmitted to the acquisition card controller, and the acquisition card controller sends the acquisition signals to the host computer for data analysis; and determines whether to alarm based on the analysis results; if an alarm occurs, it is possible that the 4 oil sensors 12 have liquid level sensor signal feedback, which indicates that there is oil leakage in the oil leakage monitoring oil pan 11, so an alarm is issued; if the pressure transmitter 9 satisfies: 14Mpa≥P1 / P2 / P3≥13Mpa; then the host computer does not alarm; if 10Mpa≥P1 / P2 / P3; then a trip alarm occurs, and the 4 SMD temperature sensors 13 acquire The collected temperature signals are further used to determine the cause of the fault; if t1 ≥ 40°C and t4 ≥ 40°C, the solenoid valve SV1 is at fault; if t2 ≥ 40°C and t4 ≥ 40°C, the solenoid valve SV2 is at fault; if t3 ≥ 40°C and t4 ≥ 40°C, the solenoid valve SV3 is at fault; if t1 ≤ 40°C and t4 ≤ 40°C, the throttle F1 is blocked; if t2 ≤ 40°C and t4 ≤ 40°C, the throttle F2 is blocked; if t3 ≤ 40°C and t4 ≤ 40°C, the throttle F3 is blocked; therefore, the monitoring device can not only perform online fault analysis and diagnosis on the low oil pressure protection device, but also track, monitor and alarm the oil leakage of equipment operation and maintenance, thereby realizing intelligent monitoring and online prediction.

[0075] Specific implementation eight: This implementation further limits the monitoring device for the independent intelligent low oil pressure trip protection test of a steam turbine described in specific implementation one. In this implementation, N is equal to three, and the acquisition card controller in the intelligent control box 10 adopts a two-out-of-three protection logic.

[0076] In this implementation, the two-out-of-three protection logic can ensure that the tripped unit is safer.

[0077] Specific implementation method 9. This implementation method further limits the monitoring device for independent intelligent low oil pressure tripping protection test of a steam turbine described in specific implementation method 1. In this implementation method, the intelligent control box 10 is provided with a remote transmission interface;

[0078] The remote transmission interface is used to transmit the pressure sensing signal acquired by the acquisition card controller in the intelligent control box 10 to the DCS system of the generator set and the mobile phone user terminal.

[0079] In this embodiment, by adding a remote transmission interface, the pressure sensor signal obtained by the acquisition card controller in the intelligent control box 10 is transmitted to the DCS system of the generator set and the mobile phone user terminal, realizing real-time data sharing for online monitoring by operation and maintenance personnel.

[0080] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A monitoring device for independent intelligent low oil pressure tripping protection test of steam turbine, characterized in that: The monitoring device comprises N groups of independent units and an intelligent control box (10); The structures of the N groups of independent units are all the same, and each group of independent units is used to independently sample the main pipe of the steam turbine generator oil system; N is an integer greater than 2; Each group of independent units includes a throttle (3), a pipe joint (4), an oil inlet stop valve (5), a solenoid valve (7) and a pressure transmitter (9); One end of the pipe joint (4) serves as a sampling connection end of the main pipe of the steam turbine generator oil system; the other end of the pipe joint (4) is connected to one end of the oil inlet stop valve (5); the other end of the oil inlet stop valve (5) is connected to the oil inlet end of the throttle (3); the oil outlet end of the throttle (3) is connected to the oil inlet port of the solenoid valve (7); the oil outlet port of the solenoid valve (7) serves as a return connection end of the main pipe of the steam turbine generator oil system; The pressure transmitter (9) is used to monitor the pressure of the pipeline between the throttle (3) and the solenoid valve (7); The intelligent control box (10) is provided with an acquisition card controller; the pressure sensing signal input end of the acquisition card controller is connected to the pressure sensing signal output end of the pressure transmitter (9); the acquisition card controller compares the pressure sensing signal with a preset pressure threshold value, and generates an interrupt control signal when the pressure sensing signal is greater than the preset pressure threshold value; the interrupt control signal output end of the acquisition card controller is connected to the interrupt control signal input end of the solenoid valve (7).

2. The monitoring device for independent intelligent low oil pressure tripping protection test of steam turbine according to claim 1 is characterized in that: Each group of independent units also includes an integrated block (2); The throttle (3) and the pipe joint (4) are both arranged on the front side wall of the integrated block (2); The oil inlet stop valve (5) and the solenoid valve (7) are both arranged on the top surface of the integrated block (2); The pipeline connected to the pressure transmitter (9) is led out from the left side wall, the right side wall or the rear side wall of the integrated block (2).

3. The monitoring device for independent intelligent low oil pressure tripping protection test of steam turbine according to claim 2 is characterized in that: Each group of independent units also includes an instrument stop valve (8); The instrument stop valve (8) is installed on the pipeline between the pressure transmitter (9) and the integrated block (2).

4. The monitoring device for independent intelligent low oil pressure tripping protection test of steam turbine according to claim 2 is characterized in that: Each group of independent units further comprises an oil return stop valve (6); The oil return stop valve (6) is arranged on the top surface of the integrated block (2), and one end of the oil return stop valve (6) is connected to the oil outlet end of the throttle (3); the other end of the oil return stop valve (6) serves as the return connection end of the main pipe of the steam turbine generator oil system.

5. The monitoring device for independent intelligent low oil pressure tripping protection test of steam turbine according to claim 2 is characterized in that: Each group of independent units also includes a mounting bracket (1); The mounting bracket (1) comprises a base and a back plate; The back plate is fixed on the base; The integrated block (2) is fixed on the base of the mounting bracket (1); The intelligent control box (10) is fixed on the back side of the back plate.

6. The monitoring device for independent intelligent low oil pressure tripping protection test of steam turbine according to claim 5 is characterized in that: Each group of independent units further comprises an oil leakage monitoring oil pan (11) and an oil sensor (12); The oil leakage monitoring oil pan (11) is arranged between the integrated block (2) and the base of the bracket (1); The oil sensor (12) is installed in the oil leakage monitoring oil pan (11), and the oil sensor signal output end of the oil sensor (12) is connected to the oil sensor signal input end of the acquisition card controller in the intelligent control box (10).

7. The monitoring device for independent intelligent low oil pressure tripping protection test of steam turbine according to claim 6 is characterized in that: Each group of independent units also includes a patch-type temperature sensor (13); The patch type temperature sensor (13) is arranged on the pipe joint (4); the temperature sensing signal output end of the patch type temperature sensor (13) is connected to the temperature sensing signal input end of the acquisition card controller in the intelligent control box (10).

8. The monitoring device for independent intelligent low oil pressure tripping protection test of steam turbine according to claim 1 is characterized in that: The N is equal to three, and the controller in the intelligent control box (10) adopts a two-out-of-three protection logic.

9. The monitoring device for independent intelligent low oil pressure tripping protection test of steam turbine according to claim 1 is characterized in that: The intelligent control box (10) is provided with a remote transmission interface; The remote transmission interface is used to transmit the pressure sensing signal acquired by the acquisition card controller in the intelligent control box (10) to the DCS system of the generator set and the mobile phone user terminal.

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