A monitoring device for independent intelligent oil pressure low-trip protection test of a steam turbine

Abstract

A kind of independent intelligent oil pressure low tripping protection test monitoring device of steam turbine, it is related to a kind of steam turbine generator unit oil system monitoring device, to solve the problem that the existing tripping protection device is not maintained in time and easily leads to non-stop accident of unit.This application is connected between the pipe joint and the inlet oil stop valve;Inlet oil stop valve and throttler are communicated;Throttler and solenoid valve are communicated;The oil outlet of solenoid valve is connected back to the mother pipe;Pressure transmitter is used to monitor the pressure of pipeline between throttler and solenoid valve;Acquisition card controller is connected with pressure transmitter;Acquisition card controller compares with pressure threshold value according to preset pressure sensing signal, when pressure sensing signal is greater than preset pressure threshold value, interrupt control signal is generated;The control signal output end of acquisition card controller is connected with the control signal input end of solenoid valve.The beneficial effect is to increase the state monitoring of the device itself, improve the online monitoring ability of the health state of the device itself.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of steam turbine generator unit oil system monitoring device. BACKGROUND

[0002] At present, steam turbine generator unit oil pressure low trip protection device is mostly integrated together, main purpose is to protect steam turbine generator unit oil system failure, can be timely to the unit and carry out trip protection, while having the function of online trip protection test without affecting the operation of unit;But the existing trip protection device does not have online intelligent monitoring function, often lead to electromagnetic valve or throttler failure, or there is oil leakage, may cause unit to occur non-stop accident due to maintenance or not timely discovery, bring major hidden trouble to the safe operation of unit. SUMMARY

[0003] The purpose of the present application is to solve the problem that the existing trip protection device is not maintained in time and is prone to cause non-stop accident of unit, and a kind of steam turbine independent intelligent oil pressure low trip protection test monitoring device is proposed.

[0004] The steam turbine independent intelligent oil pressure low trip protection test monitoring device provided by the present application, the monitoring device includes N groups of independent units and intelligent control box;

[0005] The structure in the N groups of independent units is same, and each group of independent units is used for independent sampling in the mother pipe of steam turbine generator unit oil system;N is an integer greater than 2;

[0006] Each group of independent units includes throttler, pipe joint, oil inlet stop valve, electromagnetic valve and pressure transmitter;

[0007] One end of the pipe joint is used as the sampling connection end of the mother pipe of steam turbine generator unit oil system;The other end of the pipe joint is connected with one end of the oil inlet stop valve;The other end of the oil inlet stop valve is connected with the oil inlet end of the throttler;The oil outlet end of the throttler is connected with the oil inlet port of the electromagnetic valve;The oil outlet port of the electromagnetic valve is used as the backflow connection end of the mother pipe of steam turbine generator unit oil system;

[0008] The pressure transmitter is used for monitoring the pressure of pipeline between throttler and electromagnetic valve;

[0009] The intelligent control box is provided with acquisition card controller;The pressure sensing signal output end of the pressure transmitter is connected with the pressure sensing signal input end of the acquisition card controller;The acquisition card controller compares the pressure sensing signal with the preset pressure threshold value, generates 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 with the interrupt control signal input end of the electromagnetic valve.

[0010] Further, each group of independent units further comprises an integrated block;

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

[0012] The oil inlet stop valve and the electromagnetic valve are arranged on the top surface of the integrated block.

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

[0014] Further, each group of independent units further comprises an instrument stop valve.

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

[0016] Further, each group of independent units further comprises 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 with the oil outlet end of the throttle; the other end of the oil return stop valve serves as a return connection end of the oil system main pipe of the steam turbine generator unit.

[0018] Further, each group of independent units further comprises a mounting bracket.

[0019] The mounting bracket comprises 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 of the back plate.

[0023] Further, each group of independent units further comprises 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 an oil sensor signal output end of the oil sensor is connected with an oil sensor signal input end of an acquisition card controller in the intelligent control box.

[0026] Further, each group of independent units further comprises a patch type temperature sensor.

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

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

[0029] Further, the intelligent control box is provided with a remote transmission interface.

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

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

[0032] 1. The present application is a brand-new independent intelligent oil pressure low-tripping device monitoring device. In addition to monitoring the main pressure of the oil system tripping protection caused by the generator set, the state of the device itself is monitored, and the online monitoring capability of the health state of the device itself is improved.

[0033] 2. The acquisition card controller provided in the intelligent control box can analyze the online fault of the oil pressure low-tripping device, give online maintenance measures, and avoid the mis-tripping of the generator set caused by the fault of the oil pressure low-tripping device itself.

[0034] 3. The present application also has a signal remote transmission interface. The independent intelligent monitoring can also be transmitted to the DCS system of the generator set and the mobile phone user end, realizing real-time data sharing for online monitoring by the operation and maintenance personnel.

[0035] 4. The present application is easy to install, and the independent integrated device meets the sampling position requirements of the tripping protection device of the generator set, saves the number of sampling pipelines, and is reasonable and beautiful.

[0036] 5. The present application reduces the daily inspection work of the maintenance personnel, and truly realizes intelligent online monitoring and operation. DETAILED DESCRIPTION

[0037] Figure 1 A front view of a monitoring device for a steam turbine independent intelligent oil pressure low-tripping protection test according to the first embodiment;

[0038] Figure 2 A side view of a monitoring device for a steam turbine independent intelligent oil pressure low-tripping protection test according to the first embodiment;

[0039] Figure 3 A top view of a monitoring device for a steam turbine independent intelligent oil pressure low-tripping protection test according to the first embodiment without a pressure transmitter;

[0040] Figure 4 A working principle diagram of a monitoring device for a steam turbine independent intelligent oil pressure low-tripping protection test according to the first embodiment;

[0041] Figure 5 Control strategy flow chart for the acquisition card controller in embodiment seven.

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

[0043] Embodiment one, combination Figures 1 to 4 In this embodiment, the monitoring device for the independent intelligent oil pressure low-trip protection test of a steam turbine comprises N groups of independent units and an intelligent control box 10.

[0044] The structures in the N groups of independent units are the same, and each group of independent units is used for independent sampling in the main pipe of the oil system of a steam turbine generator unit; N is an integer greater than 2.

[0045] Each group of independent units comprises 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 serves as a sampling connection end of the main pipe of the oil system of a steam turbine generator unit; the other end of the pipe joint 4 is in communication with one end of the oil inlet stop valve 5; the other end of the oil inlet stop valve 5 is in communication with the oil inlet end of the throttle 3; the oil outlet end of the throttle 3 is in communication with the oil inlet port of the solenoid valve 7; and the oil outlet port of the solenoid valve 7 serves as a return connection end of the main pipe of the oil system of a steam turbine generator unit.

[0047] The pressure transmitter 9 is used for monitoring 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 output end of the pressure transmitter 9 is connected to the pressure sensing signal input end of the acquisition card controller; the acquisition card controller compares the pressure sensing signal with a preset pressure threshold value, generates an interrupt control signal when the pressure sensing signal is greater than the preset pressure threshold value; and 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 the embodiment, the monitoring device is provided with three independent sampling points, HP1, HP2 and HP3. The main oil pressure HP1 passes through the oil inlet stop valve 5 and the throttle 3. The pressure transmitters 9 (PT1, PT2 and PT3) are responsible for monitoring the oil pressure values of the three paths respectively, which can be displayed online and transmitted remotely. The normal operating pressure of the generator set is 14 MPa. Once the main oil pressure is lower than the set-off value 10 MPa of the set, the pressure transmitter 9 will transmit the pressure signal to the DCS control system of the set to control the ETS for set-off protection. Therefore, the preset pressure threshold is 10 MPa. The electromagnetic valves SV1, SV2 and SV3 are in the normally closed state during the operation of the set, which are mainly used for online remote set-off protection test. When the test is performed, if the electromagnetic valve 7 is opened, the pressure sensing signal will be transmitted to the acquisition card of the intelligent control box 10 by the pressure transmitter 9. The acquisition card will transmit the pressure sensing signal to the acquisition card controller. If the acquisition card controller judges that the pressure sensing signal transmitted by the acquisition card is lower than the preset pressure threshold, the electromagnetic valve 7 will be automatically closed by the acquisition card controller to realize the set-off protection test function. Moreover, the main oil pressure will not change due to the existence of the throttle 3 during the set-off.

[0050] The monitoring device of the embodiment can independently sample in the main pipe of the oil system through the independent unit, monitor the main pipe pressure of the oil system in real time by the pressure transmitter 9, trigger the electromagnetic valve 7 to automatically close (set-off) when any failure occurs in the oil system and the pressure is lower than the preset pressure threshold (set-off value of the operating pressure of the generator set), and realize the safety protection of the set. Meanwhile, the basic function of remote online set-off protection test can be realized under the premise of normal operation of the set, and the fault health diagnosis system and the operation and maintenance function of the intelligent monitoring set-off device can be realized. The independent unit of the embodiment can collect various monitoring signals by different types of sensors, collect signals by the integrated acquisition card controller, and display the operating state of the equipment in real time on the display interface, which can realize the set-off protection of the set and intelligently diagnose the fault analysis of the set-off protection device, so as to realize online maintenance in time, ensure the safe operation of the set, and improve the reliability of the set.

[0051] Specific embodiment two, the embodiment is a further limitation of the monitoring device for the independent intelligent oil pressure low set-off protection test of the steam turbine in the specific embodiment one. In the embodiment, each group of independent units further comprises an integrated block 2.

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

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

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

[0055] In the embodiment, the throttler 3, the pipe joint 4, the oil inlet stop valve 5 and the electromagnetic valve 7 are arranged together by the integrated block 2, the number of sampling pipelines is saved, installation is convenient, and the device is reasonable and beautiful.

[0056] Specific implementation three, the embodiment is a further limitation of the monitoring device for the independent intelligent oil pressure low tripping protection test of the steam turbine in the specific implementation two, in the embodiment, 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 the embodiment, by increasing the instrument stop valve 8, maintenance or replacement is facilitated; at the same time, the instrument stop valve 8 facilitates adjustment and control of the pressure transmitter 9, and prevents damage to the pressure transmitter 9.

[0059] Specific implementation four, the embodiment is a further limitation of the monitoring device for the independent intelligent oil pressure low tripping protection test of the steam turbine in the specific implementation two, in the embodiment, each group of independent units further includes a return oil stop valve 6.

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

[0061] In the embodiment, the return oil stop valve 6 and the electromagnetic valve 7 are in parallel relationship, by increasing the return oil stop valve 6, a 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 performed, the return oil stop valve 6 is opened, the pressure transmitter 9 transmits a pressure sensing signal to the acquisition card of the intelligent control box 10, the acquisition card transmits the pressure sensing signal to the acquisition card controller, and corresponding values are displayed and corresponding alarm prompts are issued, the return oil stop valve 6 is manually closed, and the tripping protection test function is realized.

[0062] Specific implementation five, the embodiment is a further limitation of the monitoring device for the independent intelligent oil pressure low tripping protection test of the steam turbine in the specific implementation two, in the embodiment, each group of independent units further includes a mounting bracket 1.

[0063] The mounting bracket 1 includes 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 of the back plate.

[0067] In the embodiment, the installation of the mounting bracket 1 makes the monitoring device convenient to move and observe the values.

[0068] Specific embodiment six, the embodiment is a further limitation of the monitoring device for the independent intelligent oil pressure low tripping protection test of the steam turbine in specific embodiment two. In the embodiment, 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 the embodiment, by increasing the oil leakage monitoring oil pan 11 and the oil sensor 12, the oil sensor 12 is 4, and the four oil sensors 12 are arranged at four corners of the oil leakage monitoring oil pan 11, respectively, to monitor the real-time oil leakage of the monitoring device.

[0072] Specific embodiment seven, in combination Figure 5 The embodiment is described, and the embodiment is a further limitation of the monitoring device for the independent intelligent oil pressure low tripping protection test of the steam turbine in specific embodiment six. In the embodiment, each group of independent units further includes a patch temperature sensor 13.

[0073] The patch temperature sensor 13 is arranged on the pipe joint 4, and the temperature sensing signal output end of the patch 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 the embodiment, patch temperature sensors 13 are added to the oil inlet pipelines HP1, HP2, and HP3 and the oil return pipeline DV to monitor the corresponding pipeline temperatures, and the control strategy of the acquisition card controller is as shown in FIG. 5 in combination with the patch temperature sensors 13. Figure 5The sensor acquisition signal includes temperature signals acquired by the four patch temperature sensors 13, liquid level signals of the four oil sensors 12, and pressure signals of the three pressure transmitters 9; the sensor acquisition signal is transmitted to the acquisition card controller, the acquisition card controller sends the acquisition signal to the host computer for data analysis; and whether to alarm is determined according to the analysis result; wherein if the alarm, it is possible that the four oil sensors 12 have liquid level sensing signal feedback, which indicates that the oil leakage monitoring oil pan 11 exists oil leakage, so the alarm; if the pressure transmitter 9 satisfies: 14Mpa≥P1 / P2 / P3≥13Mpa; the host computer does not alarm; if 10Mpa≥P1 / P2 / P3; the trip alarm occurs, and the temperature signals acquired by the four patch temperature sensors 13 are further used to determine the fault reason; if t1≥40℃, and t4≥40℃, the electromagnetic valve SV1 is faulty; if t2≥40℃, and t4≥40℃, the electromagnetic valve SV2 is faulty; if t3≥40℃, and t4≥40℃, the electromagnetic valve SV3 is faulty; if t1≤40℃, and t4≤40℃, the throttle F1 is blocked; if t2≤40℃, and t4≤40℃, the throttle F2 is blocked; if t3≤40℃, and t4≤40℃, the throttle F3 is blocked; therefore, the monitoring device can not only perform online analysis and diagnosis on the oil pressure low protection device, but also track and monitor the oil leakage of the equipment operation and maintenance and alarm, so as to realize intelligent monitoring and online prediction.

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

[0076] In the present embodiment, the two-out-of-three protection logic can ensure that the unit is more secure.

[0077] Specific embodiment nine, the present embodiment is a further limitation of the monitoring device for the independent intelligent oil pressure low trip protection test of the steam turbine described in specific embodiment one, in the present embodiment, the intelligent control box 10 is provided with a remote transmission interface;

[0078] The remote transmission interface is used for transmitting 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 end.

[0079] In the present embodiment, by increasing the remote transmission interface, the pressure sensing signal acquired 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 end, realizing real-time data sharing for online monitoring by the operation and maintenance personnel.

[0080] The above merely illustrates the specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A monitoring device for independent intelligent oil pressure low-trip protection test of a steam turbine, characterized in that, The monitoring device comprises N groups of independent units and a smart control box (10); The structures of the N groups of independent units are identical, and each group of independent units is used for independent sampling in a main pipe of a turbine generator unit oil system; N is an integer greater than 2; Each group of independent units comprises a throttling device (3), a pipe joint (4), an oil inlet stop valve (5), an electromagnetic 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 turbine generator unit oil system; the other end of the pipe joint (4) is in communication with one end of the oil inlet stop valve (5); the other end of the oil inlet stop valve (5) is in communication with an oil inlet end of the throttling device (3); an oil outlet end of the throttling device (3) is in communication with an oil inlet port of the electromagnetic valve (7); an oil outlet port of the electromagnetic valve (7) serves as a backflow connection end of the main pipe of the turbine generator unit oil system; The pressure transmitter (9) is used for monitoring the pressure of a pipeline between the throttling device (3) and the electromagnetic valve (7); The smart control box (10) is provided with an acquisition card controller; a pressure sensing signal output end of the pressure transmitter (9) is connected with a pressure sensing signal input end of the acquisition card controller; the acquisition card controller compares a preset pressure threshold value with a pressure sensing signal, and generates an interrupt control signal when the pressure sensing signal is less than the preset pressure threshold value; an interrupt control signal output end of the acquisition card controller is connected with an interrupt control signal input end of the electromagnetic valve (7); Each group of independent units further comprises an integrated block (2); The throttling device (3) and the pipe joint (4) are arranged on a front side wall of the integrated block (2); The oil inlet stop valve (5) and the electromagnetic valve (7) are arranged on a top surface of the integrated block (2); A pipeline in communication with the pressure transmitter (9) is led out from a left side wall, a right side wall or a rear side wall of the integrated block (2); Each group of independent units further comprises 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 smart control box (10) is fixed on a back surface of the back plate; Each group of independent units further comprises an oil leakage monitoring oil pan (11) and an oil liquid 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 liquid sensor (12) is installed in the oil leakage monitoring oil pan (11), and an oil liquid sensor signal output end of the oil liquid sensor (12) is connected with an oil liquid sensor signal input end of an acquisition card controller in the smart control box (10); Each group of independent units further comprises a patch type temperature sensor (13); The patch type temperature sensor (13) is arranged on the pipe joint (4); a temperature sensing signal output end of the patch type temperature sensor (13) is connected with a temperature sensing signal input end of the acquisition card controller in the smart control box (10).

2. A monitoring device for independent intelligent oil pressure low-trip protection test of a steam turbine according to claim 1, characterized in that, Each group of independent units further comprises an instrument stop valve (8); The instrument stop valve (8) is installed on a pipeline between the pressure transmitter (9) and the integrated block (2).

3. The monitoring device for independent intelligent oil pressure low-trip protection test of a steam turbine according to claim 1, 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 with the oil outlet end of the throttler (3); the other end of the oil return stop valve (6) is used as the return connection end of the steam turbine generator unit oil system mother pipe.

4. The monitoring device for independent intelligent oil pressure low-trip protection test of a steam turbine according to claim 1, 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.

5. A monitoring device for independent intelligent oil pressure low-trip protection test of a steam turbine according to claim 1, characterized in that, The intelligent control box (10) is provided with a remote transmission interface. The remote transmission interface is used for transmitting the pressure sensing signals 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 end.

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