Inspection methods for oil injection devices in high-temperature reactor turbines

Abstract

This invention proposes a testing method for an oil injection device in a high-temperature reactor steam turbine, belonging to the technical field of high-temperature reactor steam turbine oil injection testing. The method includes: with the steam turbine stationary, switching the test handle of the emergency safety device to the test position and determining whether the first oil pressure changes; if the first oil pressure remains unchanged, switching the trip handle of the emergency safety device from the normal position to the trip position, causing the emergency safety device to activate, and determining whether the second oil pressure decreases; if the second oil pressure decreases, switching the trip handle of the emergency safety device from the normal position to the reset position and determining whether the third oil pressure returns to normal, thereby verifying whether the oil injection device can perform the oil injection test. This invention's method for testing the oil injection device ensures that the requirements of the steam turbine oil injection test are met, avoids steam turbine tripping due to oil injection test failure at 3000 rpm, is convenient to operate, highly efficient, and can greatly improve the reliability of the steam turbine oil injection test.

Description

Technical Field

[0001] This invention belongs to the field of oil injection testing technology for high-temperature reactor turbines, and specifically relates to a test method for an oil injection device for a high-temperature reactor turbine. Background Technology

[0002] The online oil injection test of the emergency safety system of a steam turbine generator set is a means of verifying the reliability of the steam turbine safety system. The oil injection test is conducted at 3000 rpm, and the specific procedure is as follows: At the turbine head, the emergency safety device test handle is moved from the "normal" position to the "test" position and held. Slowly open the emergency safety device's oil injection test valve and observe that the oil injection pressure should gradually increase. Pressurized oil is injected into the mechanical overspeed protection device, at the bottom of the emergency safety device's eccentric hammer. When the sum of the pressurized oil and centrifugal force exceeds the spring force, the hammer strikes, hitting the hook. Observe the emergency safety device's trip handle jump from the "normal" position to the "trip" position, indicating the emergency safety device is activated. The upper oil pressure of the diaphragm valve is normal, meaning the unit is operating at 3000 rpm. As the speed increases, the centrifugal force increases. Based on the combined effect of centrifugal force and oil pressure, the eccentric hammer of the emergency safety device strikes, hitting the emergency safety device lever, releasing the safety oil at the bottom of the emergency safety device's slide valve, causing the slide valve to move downwards, opening the diaphragm valve's drain channel, releasing the upper oil pressure of the diaphragm valve, opening the diaphragm valve, releasing the AST main pipe oil pressure, closing all main steam valves, and simultaneously releasing the OPC oil pressure through the check valve on the AST oil pressure main pipe, closing all regulating valves, cutting off the turbine's steam intake, and achieving shutdown.

[0003] During the oil filling test, the operation of each handle of the emergency safety device is crucial. For example, if the trip handle is not restored to normal or the emergency safety device is not reset before the oil filling test handle is released, the safety oil pressure will be lost, causing the unit to trip and resulting in unnecessary losses.

[0004] Currently, to prevent false tripping of the turbine, some literature proposes devices to prevent such tripping. These include a fixed connector on the emergency trip unit's oil injection test control panel and a stop that cooperates with the connector. The stop blocks the normal position on the control panel, preventing the operating handle from accidentally springing back from the isolation position to the normal position, thus avoiding false turbine tripping. However, this device is used under the condition of turbine unit operation at 3000 rpm, and it requires additional structural components, increasing operational complexity and testing costs. Furthermore, despite the addition of devices to prevent false tripping, the turbine can still trip in the event of oil injection failure.

[0005] In view of the above-mentioned technical problems, in order to avoid the shutdown caused by the failure of the oil injection test, the present invention proposes a test method for the oil injection device of high temperature reactor steam turbine. Summary of the Invention

[0006] The present invention aims to solve at least one of the technical problems existing in the prior art, and provides a method for inspecting the oil injection device of a high-temperature reactor turbine.

[0007] This invention provides a method for inspecting an oil injection device for a high-temperature reactor turbine, the specific steps of which include:

[0008] When the emergency safety device is switched to the test position while the steam turbine is stationary, determine whether the first oil pressure changes.

[0009] When the first oil pressure remains unchanged, the emergency safety device's trip handle is switched from the normal position to the trip position, the emergency safety device trips, and it is determined whether the second oil pressure has decreased.

[0010] In response to the second oil pressure drop, the emergency safety device's shut-off handle is switched from the normal position to the reset position, and it is determined whether the third oil pressure has returned to normal pressure in order to verify whether the oil injection device can perform an oil injection test.

[0011] Optionally, determine whether the third oil pressure has returned to normal pressure to verify whether the oil injection device can perform an oil injection test, including:

[0012] When the third oil pressure returns to the normal pressure, the oil injection device is normal and an oil injection test can be performed.

[0013] Optionally, determining whether the third oil pressure has returned to normal pressure to verify whether the oil injection device can perform an oil injection test also includes:

[0014] If the third oil pressure fails to return to the normal pressure, the oil injection device malfunctions.

[0015] Optionally, the oil injection device malfunctions in response to a change in the first oil pressure.

[0016] Optionally, if the second oil pressure does not decrease, the oil injection device malfunctions.

[0017] Optionally, the step of the turbine being in a stationary state includes:

[0018] Start the turbine's lubricating oil pump, high-pressure oil pump, and EH oil pump to engage the turbine.

[0019] Optionally, the shut-off handle of the emergency safety device is held in the reset position for 15s to 35s.

[0020] Optionally, the first oil pressure, the second oil pressure, and the third oil pressure are the oil pressure values ​​of the emergency safety device diaphragm valve.

[0021] This invention proposes a testing method for an oil injection device in a high-temperature reactor steam turbine. The specific steps include: with the turbine stationary, switching the test handle of the emergency safety device to the test position and determining whether the first oil pressure changes; if the first oil pressure remains unchanged, switching the trip handle of the emergency safety device from the normal position to the trip position, causing the emergency safety device to activate, and determining whether the second oil pressure decreases; if the second oil pressure decreases, switching the trip handle of the emergency safety device from the normal position to the reset position and determining whether the third oil pressure returns to normal, thereby verifying whether the oil injection device can perform an oil injection test. This invention verifies the oil injection device while the turbine is stationary, eliminating the need for additional devices to prevent accidental tripping. By using this method to test the oil injection device, the requirements for steam turbine oil injection tests can be ensured, allowing for smooth oil injection tests of the steam turbine unit operating at 3000 rpm. The method is convenient, efficient, and significantly improves the reliability of steam turbine oil injection tests. Attached Figure Description

[0022] Figure 1 This is a flowchart illustrating a method for inspecting a high-temperature reactor turbine oil injection device according to an embodiment of the present invention.

[0023] Figure 2 This is a schematic diagram of an inspection method for a high-temperature reactor turbine oil injection device according to an embodiment of the present invention. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0025] Unless otherwise specifically stated, the technical or scientific terms used in this invention should be understood in their ordinary sense by one of ordinary skill in the art to which this invention pertains. The terms "comprising" or "including," as used in this invention, do not limit the shapes, numbers, steps, actions, operations, components, elements, and / or groups thereof mentioned, nor do they exclude the appearance or inclusion of one or more other different shapes, numbers, steps, actions, operations, components, elements, and / or groups thereof. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number and order of the indicated technical features.

[0026] It should be noted that, in order to avoid the turbine tripping due to the failure of the oil injection test when the turbine is running at 3000 rpm, resulting in huge power generation losses, this invention proposes a test method for the oil injection device of a high-temperature reactor turbine. This method involves conducting simulation verification in advance to detect problems and hidden dangers in the oil injection device, identify and resolve faults in advance, and thus ensure the success of the oil injection test.

[0027] like Figure 1 and Figure 2 As shown, the present invention provides a method S100 for inspecting an oil injection device for a high-temperature reactor turbine, specifically including the following steps S110 to S130:

[0028] S110. With the turbine stationary, switch the test handle 210 of the emergency safety device to the test position and hold it to determine whether the first oil pressure at the top of the diaphragm valve has changed.

[0029] Specifically, the turbine is engaged by starting the lubricating oil pump, high-pressure oil pump, and EH oil pump. The oil pressure causes the slide valve to move from the lower support point to the upper support point. After the turbine is engaged, oil pressure is built up in the lower chamber of each valve cylinder to enable the turbine to start up and perform other operations. This allows the turbine to be in a static state while the oil injection device is being inspected.

[0030] It should be understood that the oil injection device is used to determine whether there is a malfunction by judging whether the first oil pressure changes. When the first oil pressure changes, it indicates that there is a malfunction in the oil injection device, which needs to be further inspected to avoid the machine tripping during the oil injection test. When the first oil pressure does not change, it indicates that the oil injection device is normal, and the next step can be taken.

[0031] S120. In response to the lack of change in the first oil pressure, the emergency safety device's shut-off handle 220 is switched from the normal position to the shut-off position, the emergency safety device trips, and it is determined whether the second oil pressure at the top of the diaphragm valve has decreased.

[0032] It should be noted that, in order to prevent the turbine from failing the 3000rpm oil injection test and to ensure that the turbine does not trip due to the failure of the oil injection test, in the turbine stationary state, the trip handle of the emergency safety device is used to replace the action of the flying hammer flying out during the current oil injection test. The tripping action releases a part of the oil pressure, so that the second oil pressure is slightly reduced.

[0033] It should be further noted that the second oil pressure drops slightly. By judging whether the oil pressure drops, it is possible to determine whether there is a malfunction in the oil injection device. If the second oil pressure does not drop, it indicates that there is a malfunction in the oil injection device, which needs to be further inspected to avoid the machine tripping during the oil injection test. If the second oil pressure drops, it indicates that the oil injection device is normal, and the next step can be carried out.

[0034] S130. In response to the second oil pressure decrease, the emergency safety device's shut-off handle 220 is switched from the normal position to the reset position and held for 15s to 35s. It is then determined whether the third oil pressure at the top of the diaphragm valve has returned to normal pressure in order to verify whether the oil injection device can be used for an oil injection test.

[0035] Specifically, determining whether the third oil pressure has returned to normal pressure is to verify whether the oil injection device can perform an oil injection test. This includes: if the third oil pressure returns to normal pressure, it indicates that the oil injection device is normal and can perform an oil injection test, and the oil injection test can be carried out smoothly.

[0036] Furthermore, determining whether the third oil pressure has returned to normal pressure to verify whether the oil injection device can perform the oil injection test also includes: if the third oil pressure has not returned to normal pressure, it indicates that the oil injection device has malfunctioned, the oil injection test will fail and the turbine will trip, thus prompting that maintenance needs to be carried out in advance.

[0037] This invention allows for the inspection of the oil injection device while the turbine is stationary, ensuring its proper functioning. By using the trip handle's tripping action instead of the flying hammer action during the current oil injection test, a simulation verification is performed in advance. This allows for the early detection of problems and potential hazards in the device, and the early troubleshooting and resolution of faults in the oil injection device. This ensures the successful conduct of the oil injection test, essentially providing an early warning for the test. If the test is successful, the turbine will not trip.

[0038] The inspection method for the oil injection device of a high-temperature reactor turbine will be further explained below with reference to specific embodiments:

[0039] Example 1

[0040] This example illustrates the inspection method for the oil injection device of a high-temperature reactor turbine, including the following steps:

[0041] S1. Start the lubricating oil pump, high-pressure oil pump, and EH oil pump to engage the turbine. Turn the emergency safety device test handle to the "test position" and hold it there. Observe that there is no change in the first oil pressure on the diaphragm valve.

[0042] S2. Move the emergency safety device shut-off handle from the "normal" position to the "shut-off" position. The emergency safety device will activate, and the second oil pressure at the top of the diaphragm valve will decrease slightly.

[0043] S3. After moving the emergency safety device trip handle from the "normal" position to the "reset" position and holding it for 20 seconds, observe whether the third oil pressure on the diaphragm valve can return to the normal pressure. If it can return to the normal pressure, it indicates that the trip device is normal, that is, the emergency safety device is normal, which further indicates that the oil injection device is normal and the oil injection test can be carried out smoothly. If the oil pressure cannot return, it indicates that the trip device is faulty, that is, the emergency safety device is faulty, which further indicates that the oil injection device is not normal, the oil injection test will fail and thus cause the turbine to trip.

[0044] This invention proposes a testing method for an oil injection device in a high-temperature steam turbine, which has the following beneficial effects:

[0045] First, this invention verifies the oil injection device while the turbine is stationary, which can detect defects in the oil injection test device in advance to ensure that the requirements of the turbine oil injection test are met. This allows the turbine unit to successfully carry out the oil injection test at 3000 rpm, thus avoiding turbine tripping due to failure of the oil injection test at 3000 rpm.

[0046] Secondly, the testing method of the present invention is easy to operate, can improve the working efficiency of oil injection test, and can greatly improve the reliability of steam turbine oil injection test. It is applicable to almost all steam turbine oil injection test devices in China, requires no additional external equipment, has good effect, and can effectively detect device problems in steam turbine rotor oil injection test in advance, avoiding the risk of turbine tripping.

[0047] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A method for inspecting an oil injection device for a high-temperature reactor turbine, characterized in that, The specific steps include: When the emergency safety device is switched to the test position while the steam turbine is stationary, determine whether the first oil pressure changes. When the first oil pressure changes, the oil injection device malfunctions; when the first oil pressure does not change, the emergency safety device's trip handle is switched from the normal position to the trip position, the emergency safety device trips, and it is determined whether the second oil pressure has decreased. If the second oil pressure does not decrease, the oil injection device malfunctions; if the second oil pressure decreases, the emergency stop handle is switched from the normal position to the reset position, and it is determined whether the third oil pressure has returned to normal pressure, in order to verify whether the oil injection device can perform an oil injection test, including: When the third oil pressure returns to the normal pressure, the oil injection device is normal and an oil injection test can be performed. If the third oil pressure fails to return to the normal pressure, the oil injection device malfunctions.

2. The method according to claim 1, characterized in that, The state in which the steam turbine is stationary includes: Start the turbine's lubricating oil pump, high-pressure oil pump, and EH oil pump to engage the turbine.

3. The method according to claim 1, characterized in that, The emergency safety device's shut-off handle remains in the reset position for 15 to 35 seconds.

4. The method according to claim 1, characterized in that, The first oil pressure, the second oil pressure, and the third oil pressure are the oil pressure values ​​of the emergency safety device diaphragm valve.

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