Safety action test device for multi-channel steam turbine protection system

Abstract

The utility model discloses a multichannel steam turbine protection system safety action test device, which relates to the technical field of steam turbine protection systems, and comprises a plurality of parallel sampling channels, the output ends of the parallel sampling channels are communicated with an output pipeline, and the input ends of the parallel sampling channels are arranged in parallel; each sampling channel comprises an isolation valve close to the input end, an output port of the isolation valve is communicated with an input port of a throttling hole through a first pipeline, an output port of the throttling hole is communicated with an input port of a manual valve through a second pipeline, and an output port of the manual valve is communicated with an output pipeline through a third pipeline; the second pipeline, connected with the throttling hole, of the manual valve is connected with a plurality of pressure switches through a plurality of fourth pipelines. According to the utility model, sampling point redundancy and pressure switch redundancy of a protection system are realized; the two sampling channels are physically independent and do not influence each other.

Description

Technical Field

[0001] The utility model relates to the technical field of steam turbine protection systems, in particular to a multi-channel steam turbine protection system safety action test device. Background Art

[0002] In response to steam turbine generator sets in the power industry, the National Energy Administration issued the "Twenty-Five Key Requirements for Preventing Power Production Accidents". In the "Preventing Control and Protection Failure Accidents of Distributed Control Systems", it is required that "all important main and auxiliary machine protections should adopt a three-out-of-two logical judgment method, and the protection signal should follow the principle of relative independence from the sampling point to the input module. If the number of measuring points is insufficient due to system reasons, measures should be taken to prevent false protection operations."

[0003] Nowadays, many power companies, especially those that have been running for many years, use single-point sampling for the lubricating oil pressure cut-off test device, EH oil pressure cut-off test device, condenser vacuum cut-off test device and other devices in the main turbine protection system, which do not meet the twenty-five countermeasures requirements. The first and second test circuits of the turbine protection test device are taken from the same sampling point, which has the following disadvantages:

[0004] 1. Most of the existing test devices for the main protection system of steam turbines were originally designed for single pressure point sampling, which does not meet the "Twenty-five Key Requirements for Preventing Power Production Accidents" issued by the Energy Bureau;

[0005] 2. With the existing single-point sampling method, during the operation of the unit, the first and second test circuits in the test device affect each other, and there is a hidden danger of false operation when one side is tested and the pressure of the other side is reduced, which can easily cause the unit to stop;

[0006] 3. The existing protection test device has an isolation valve inside the control block, but no valve is set on the pressure sampling pipeline. If the pipeline outside the control block or the relevant weld leaks, it will not be effectively isolated, which will cause the unit to stop unexpectedly;

[0007] 4. For single-point sampling devices, impurities are easily accumulated when the system is inactive for a long time, causing jamming, and thus it is impossible to ensure the reliable operation of the emergency trip protection system, which may cause major accidents under abnormal circumstances;

[0008] 5. Since the internal pipelines of the device are single-point sampling, if any one line fails and is isolated for maintenance, both lines will lose their protection function, and there will be great risks and hidden dangers under abnormal circumstances.

[0009] 6. The system can only take samples at a single point. The number of measuring points is too small to monitor multiple points. In addition, the system is prone to misjudgment of abnormal situations, resulting in false operation and causing the unit to stop unexpectedly. There is a lack of necessary measures to prevent false operation of protection.

[0010] Therefore, those skilled in the art provide a multi-channel steam turbine protection system safety action test device to solve the problems raised in the above background technology. Utility Model Content

[0011] The utility model provides a multi-channel steam turbine protection system safety action test device which realizes sampling point redundancy and pressure switch redundancy of the protection system; the two sampling channels are physically independent of each other and do not affect each other, thereby eliminating the hidden danger of the prior art that the physical independence is not realized and the mutual influence may cause the malfunction of the protection system.

[0012] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0013] The utility model discloses a multi-channel steam turbine protection system safety action test device, comprising multiple parallel sampling channels, the output ends of the multiple parallel sampling channels are connected to an output pipeline, and the input ends of the multiple parallel sampling channels are all arranged in parallel;

[0014] Each of the sampling channels includes an isolation valve near the input end, the output port of the isolation valve is connected to the input port of the throttle hole through a first pipeline, the output port of the throttle hole is connected to the input port of the manual valve through a second pipeline, the output port of the manual valve is connected to the output pipeline through a third pipeline, and the second pipeline connecting the manual valve and the throttle hole is respectively connected to multiple pressure switches through multiple fourth pipelines.

[0015] Furthermore, the second pipeline connecting the manual valve and the throttle hole is connected to the pressure gauge through a fifth pipeline.

[0016] Furthermore, the fourth pipeline and the plurality of fifth pipelines are respectively provided with stop valves.

[0017] Furthermore, each stop valve on the fifth pipeline is located upstream of the corresponding pressure switch.

[0018] Furthermore, the number of the pressure switches is two.

[0019] Furthermore, a solenoid valve is connected between the second pipeline connecting the manual valve and the throttle hole and the output pipeline through a pipeline, and the solenoid valve is connected in parallel with the manual valve.

[0020] Furthermore, the isolation valve, throttle hole, manual valve, pressure switch, pressure gauge, stop valve and solenoid valve are all installed on the control valve block.

[0021] In the above technical solution, the utility model provides a multi-channel steam turbine protection system safety action test device, which has the following beneficial effects:

[0022] 1. The device has a simple system and is stable and reliable to use;

[0023] 2. The device can independently sample at multiple points to ensure the precise action of the protection device;

[0024] 3. This device realizes the redundancy of sampling points and pressure switches of the protection system; the two sampling channels are physically independent and do not affect each other, eliminating the hidden danger of the existing technology that does not achieve physical independence and may affect each other, thereby causing the protection system to malfunction.

[0025] 4. The structural form of this device has a wide range of applications, and is also suitable for lubricating oil low pressure cut-off test devices, EH oil low pressure test devices, condenser vacuum low cut-off test devices, etc., which can effectively ensure the safe and reliable operation of the protection system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0027] Figure 1 A hydraulic principle diagram of a multi-channel steam turbine protection system safety action test device provided in an embodiment of the utility model.

[0028] Description of reference numerals:

[0029] 10. Sampling channel;

[0030] 101, isolation valve; 102, throttle hole; 103, first pipeline; 104, second pipeline; 105, manual valve; 106, third pipeline; 107, fourth pipeline; 108, pressure switch; 109, fifth pipeline; 110, pressure gauge; 111, stop valve; 112, solenoid valve;

[0031] 20. Output pipeline;

[0032] 30. Control valve block. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0034] See also Figure 1 As shown;

[0035] A multi-channel steam turbine protection system safety action test device described in an embodiment of the utility model comprises two parallel sampling channels 10, the output ends of the two parallel sampling channels 10 are connected to an output pipeline 20, and the input ends of the two parallel sampling channels 10 are arranged in parallel, and the sampling channels can be applied to lubricating oil low pressure shutoff test, EH oil low pressure test and condenser vacuum low shutoff test;

[0036] Each sampling channel 10 includes an isolation valve 101 near the input end, the output port of the isolation valve 101 is connected to the input port of the throttle hole 102 through a first pipeline 103, the output port of the throttle hole 102 is connected to the input port of the manual valve 105 through a second pipeline 104, the output port of the manual valve 105 is connected to the output pipeline 20 through a third pipeline 106, and the second pipeline 104 connecting the manual valve 105 and the throttle hole 102 is respectively connected to two pressure switches 108 through two fourth pipelines 107.

[0037] When the manual valve 105 is opened, the pressure of the two corresponding pressure switches 108 decreases, the alarm lights connected to the two pressure switches 108 light up, and the controller controls the corresponding AST solenoid valves to operate, increasing the AST oil pressure; the same steps are performed on the other sampling channel 10.

[0038] In case of leakage, the device can be completely isolated by isolating valve 101, thus meeting the function of safe online maintenance and eliminating other risks.

[0039] The present application adopts two-point independent sampling to ensure the accurate action of the protection device; (the sampling point redundancy of the protection system and the pressure switch redundancy are realized; the two sampling channels 10 are physically independent and do not affect each other, eliminating the hidden danger of the prior art that physical independence is not achieved and there is a possibility of mutual influence, thereby causing the protection system to malfunction.

[0040] The second pipeline 104 connecting the manual valve 105 and the throttle hole 102 is connected to the pressure gauge 110 through the fifth pipeline 109. When the manual valve 105 is opened, the pressure gauge 110 can measure the pressure value in the direction of the input port of the manual valve 105 at this time.

[0041] The fourth pipeline 107 and the two fifth pipelines 109 are respectively provided with a stop valve 111; the stop valve 111 on each of the fifth pipelines 109 is located upstream of the corresponding pressure switch 108, and is used to control the on-off of the fifth pipeline 109 connected to the pressure gauge 110 and the two pressure switches 108 respectively.

[0042] A solenoid valve 112 is connected between the second pipeline 104 connecting the manual valve 105 and the throttle hole 102 and the output pipeline 20 through a pipeline, and the solenoid valve 112 is connected in parallel with the manual valve 105 .

[0043] Manual valve 105 is used for manual local test, and solenoid valve 112 is used for remote test of test button.

[0044] The isolation valve 101 , the throttle hole 102 , the manual valve 105 , the pressure switch 108 , the pressure gauge 110 , the stop valve 111 and the solenoid valve 112 are all installed on the control valve block 30 .

[0045] The pipeline separation design mode within the control valve block 30 realizes independent operation experiments of two sampling channels, realizes physical separation of two sampling channels of the device, and enhances the safety and reliability of device operation.

[0046] When this application is used as a condenser vacuum low trip test device, the specific operations are as follows:

[0047] Manual in-situ test:

[0048] The condenser vacuum enters each sampling channel 10 through the isolation valve 101, and then enters the throttle hole 103. When the manual valve 105 on the sampling channel 10 is opened, the output pipeline 20 is connected to the atmosphere; the pressure of the two corresponding pressure switches 108 decreases, and the alarm lights connected to the two pressure switches 108 light up, and the controller controls the corresponding AST solenoid valve to operate, thereby increasing the AST oil pressure; the same steps are performed on the other sampling channel 10.

[0049] Test button remote test:

[0050] The condenser vacuum enters each sampling channel 10 through the isolation valve 101, and then enters the throttle hole 103. When the remote test controller controls the solenoid valve 112 to open, the output pipeline 20 is connected to the atmosphere; the pressure of the two corresponding pressure switches 108 decreases, and the alarm lights connected to the two pressure switches 108 light up, and the controller controls the corresponding AST solenoid valve to operate, thereby increasing the AST oil pressure; the same steps are performed on the other sampling channel 10.

[0051] When the present application is used as a lubricating oil low pressure cut-off test device, its principle is basically the same as that of the condenser vacuum low cut-off test device, with the difference that the front box is connected to the input port of the isolation valve 101 by a pipeline, the lubricating oil in the front box enters each sampling channel 10 from the isolation valve 101, and the output pipeline 20 is connected to the front box.

[0052] When the present application is used as an EH oil low pressure test device, its principle is basically the same as that of the condenser vacuum low shut-off test device, with the difference being that the EH pressure oil main pipe is connected to the input port of the isolation valve 101 by a pipeline, the EH pressure oil enters each sampling channel 10 from the isolation valve 101, and the output pipeline 20 is connected to the pressure-free return oil pipe.

[0053] The device of the present application has a simple structure and does not require special maintenance. It only needs to regularly calibrate the pressure gauge 110 and check whether the connecting joints are loose, which can meet the needs of long-term safe and stable operation.

[0054] Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the description are only for explaining the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A multi-channel steam turbine protection system safety action test device, characterized in that: include: Multiple sampling channels (10) are connected in parallel, the output ends of the multiple sampling channels (10) are connected to an output pipeline (20), and the input ends of the multiple sampling channels (10) are all arranged in parallel; Each sampling channel (10) comprises an isolation valve (101) near the input end, the output port of the isolation valve (101) is connected to the input port of the throttle hole (102) through a first pipeline (103), the output port of the throttle hole (102) is connected to the input port of the manual valve (105) through a second pipeline (104), the output port of the manual valve (105) is connected to the output pipeline (20) through a third pipeline (106), and the second pipeline (104) connecting the manual valve (105) and the throttle hole (102) is respectively connected to a plurality of pressure switches (108) through a plurality of fourth pipelines (107).

2. A multi-channel steam turbine protection system safety action test device according to claim 1, characterized in that: The second pipeline (104) connecting the manual valve (105) and the throttle hole (102) is connected to a pressure gauge (110) via a fifth pipeline (109).

3. A multi-channel steam turbine protection system safety action test device according to claim 2, characterized in that: The fourth pipeline (107) and the plurality of fifth pipelines (109) are respectively provided with stop valves (111).

4. A multi-channel steam turbine protection system safety action test device according to claim 3, characterized in that: The stop valve (111) on each of the fifth pipelines (109) is located upstream of the corresponding pressure switch (108).

5. A multi-channel steam turbine protection system safety action test device according to claim 1, characterized in that: The number of the pressure switches (108) is two.

6. A multi-channel steam turbine protection system safety action test device according to claim 3, characterized in that: A solenoid valve (112) is connected between the second pipeline (104) connecting the manual valve (105) and the throttle hole (102) and the output pipeline (20) through a pipeline, and the solenoid valve (112) is connected in parallel with the manual valve (105).

7. A multi-channel steam turbine protection system safety action test device according to claim 6, characterized in that: The isolation valve (101), the throttle hole (102), the manual valve (105), the pressure switch (108), the pressure gauge (110), the stop valve (111) and the solenoid valve (112) are all installed on the control valve block (30).

Images