Online replacement method and device for intelligent positioner of pneumatic control valve of nuclear power plant

Abstract

The invention provides an online replacement method and device for an intelligent positioner of a pneumatic control valve of a nuclear power plant, and the method comprises the steps: limiting the movement of a valve in another direction in a manner of fixing a coupler of the pneumatic control valve by using an online replacement mechanical device for the intelligent positioner of the pneumatic control valve of the nuclear power plant, so as to fix the valve at the current opening degree; the air supply of the positioner is cut off; the original positioner is dismounted, and the positioner spare parts are installed according to the original physical marks; and by using a single-point verification function of debugging software, sequentially filling information of the original positioner, completing setting of spare parts of the positioner, and after confirming that the state of the valve is good, recovering air supply of the positioner and recovering the valve to an automatic mode. According to the online replacement mechanical device for the intelligent positioner of the pneumatic control valve of the nuclear power plant, the movement of the valve in the other direction is limited by fixing the coupler of the pneumatic control valve, so that the valve is fixed at the current opening degree, and the problem that the influence of an existing replacement method for the valve positioner of the pneumatic control valve on the generating capacity of a unit is large is solved.

Description

Technical Field

[0001] The present application belongs to the technical field of nuclear power plant pneumatic control valve maintenance, and specifically relates to a method and device for online replacement of an intelligent positioner of a nuclear power plant pneumatic control valve. Background Art

[0002] Pneumatic control valves are widely used in various systems of nuclear power plants. During the production and operation of the units, damage to the positioner may cause valve performance degradation or unavailability, which will have a serious impact on the power generation of the units.

[0003] At present, the fault handling method of domestic nuclear power plants after the valve positioner is damaged is to first reduce the power of the entire unit or shut down the reactor, then isolate the valve from the system loop, and then replace the faulty positioner. This method has a great impact on the power generation of the unit. Summary of the invention

[0004] In view of this, the present application is dedicated to providing a method and device for online replacement of the intelligent positioner of a pneumatic control valve in a nuclear power plant. By utilizing a mechanical device for online replacement of the intelligent positioner of a pneumatic control valve in a nuclear power plant to fix the pneumatic control valve coupling, the movement of the valve in another direction is restricted so as to fix the valve at its current opening, thereby solving the problem that the existing method for replacing the valve positioner of a pneumatic control valve has a significant impact on the power generation of the unit.

[0005] The first aspect of the present application provides an online replacement method for an intelligent positioner of a pneumatic control valve in a nuclear power plant, and the online replacement method for an intelligent positioner of a pneumatic control valve in a nuclear power plant comprises: physically marking the installation position of the original positioner; reading the information of the original positioner in the debugging software supporting the intelligent positioner; adjusting the valve to manual mode, assigning corresponding opening instructions to control the valve at the current opening, and limiting the movement of the valve in a single direction by a handwheel; using an online replacement mechanical device for the intelligent positioner of a pneumatic control valve in a nuclear power plant to fix the pneumatic control valve coupling, limiting the movement of the valve in another direction to fix the valve at the current opening, and disconnecting the air supply of the positioner; removing the original positioner and installing the positioner spare parts according to the original physical mark; using the single-point verification function of the debugging software to fill in the information of the original positioner in sequence, completing the setting of the positioner spare parts, and after confirming that the valve is in good condition, restoring the air supply of the positioner and restoring the valve to automatic mode; removing the online replacement mechanical device for the intelligent positioner of a pneumatic control valve in a nuclear power plant, and completing the online replacement of the intelligent positioner.

[0006] In a specific implementation of the present application, the information of the original positioner includes control type, amplifier type, pressure unit, maximum air supply pressure range, valve actuator information, valve debugging parameters and actual stroke parameters.

[0007] The second aspect of the present application provides a nuclear power plant pneumatic control valve intelligent positioner online replacement mechanical device, the nuclear power plant pneumatic control valve intelligent positioner online replacement mechanical device comprises a supporting mechanism and an adjusting mechanism connected to each other. The adjusting mechanism is used to adjust the supporting mechanism to support the upper part of the valve yoke, limit the upward movement of the coupling, and cooperate with the valve hand wheel to fix the valve at the current opening.

[0008] In a specific embodiment of the present application, the support mechanism includes a top block. The adjustment mechanism includes a left support block, a connecting bolt, a right support block and an adjusting bolt. The left support block and the right support block form a clamp structure through the connecting bolt, and the connecting bolt is connected to the left support block through a thread. The adjusting bolt is connected to the left support block and the right support block through a thread, and the distance between the top block and the left support block and the right support block is changed by turning the adjusting bolt to match any position of the valve in the range of 0%-100% opening.

[0009] In a specific embodiment of the present application, the top block has an arc-shaped shape, and a countersunk hole is opened at the bottom of the top block. The top block is seated on the adjusting bolt through the countersunk hole.

[0010] In a specific embodiment of the present application, the support mechanism includes a top plate. The adjustment mechanism includes a lead screw, a guide shaft and a pressure plate. The external thread of the lead screw is matched with the internal thread of the guide shaft, and the distance between the top plate and the pressure plate is changed by adjusting the screwing length of the lead screw in the guide shaft to match any position of the valve in the range of 0%-100% opening.

[0011] The beneficial effect of the technical solution of the present application is that, without changing the current opening position of the valve and without affecting the operation of the process loop system where the valve is located, the online replacement of the valve intelligent positioner is completed, the positioner fault processing is realized, and the economic efficiency of the unit operation is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The figure is a flow chart of an online replacement method of a pneumatic control valve intelligent positioner of a nuclear power plant provided by an embodiment of the present application.

[0013] Figure 2 Shown is a front view of the installation of an online replacement mechanical device for an intelligent positioner of a pneumatic control valve in a nuclear power plant provided by an embodiment of the present application.

[0014] Figure 3 Shown Figure 2 The installation cross-sectional view of the online replacement mechanical device for the intelligent positioner of a pneumatic control valve in a nuclear power plant is shown.

[0015] Figure 4 Shown is a structural schematic diagram of an online replacement mechanical device for an intelligent positioner of a pneumatic control valve in a nuclear power plant provided by another embodiment of the present application. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0017] At least one embodiment of the present application provides a method for online replacement of an intelligent positioner of a pneumatic control valve in a nuclear power plant, referring to Figure 1 The online replacement method of the intelligent positioner of the pneumatic control valve of the nuclear power plant includes the following steps.

[0018] S1: Physically mark the installation location of the original locator.

[0019] S2: Read the original positioner information in the debugging software provided with the smart positioner.

[0020] In some embodiments, the original positioner information includes control type, amplifier type, pressure unit, maximum supply pressure range, valve actuator information, valve debugging parameters and actual stroke parameters.

[0021] S3: Set the valve to manual mode, assign corresponding opening instructions to control the valve at the current opening, and limit the movement of the valve in a single direction through the handwheel.

[0022] S4: Use the intelligent positioner of the pneumatic control valve of the nuclear power plant to replace the mechanical device online to fix the pneumatic control valve coupling, limit the movement of the valve in another direction, fix the valve at the current opening, and disconnect the air supply to the positioner.

[0023] It should be noted that the online replacement mechanical device for the intelligent positioner of a pneumatic control valve in a nuclear power plant can be any device that can limit the movement of the valve in another direction by fixing the pneumatic control valve coupling 7 and can fix the valve at the current opening, including but not limited to the online replacement mechanical device for the intelligent positioner of a pneumatic control valve in a nuclear power plant provided in the embodiment of the present application.

[0024] S5: Remove the original positioner and install the positioner spare parts according to the original physical markings.

[0025] S6: Use the single-point calibration function of the debugging software to fill in the information of the original positioner in sequence, complete the setting of the positioner spare parts, and after confirming that the valve is in good condition, restore the air supply to the positioner and restore the valve to automatic mode.

[0026] S7: Dismantle the online replacement mechanical device of the intelligent positioner of the pneumatic control valve of the nuclear power plant and complete the online replacement of the intelligent positioner.

[0027] According to the technical solution provided in the embodiment of the present application, the online replacement of the valve intelligent positioner is completed without changing the current opening position of the valve and without affecting the operation of the process loop system where the valve is located, and the fault handling of the positioner is realized to avoid reducing the economic efficiency of the unit operation.

[0028] At least one embodiment of the present application also provides a mechanical device for online replacement of a pneumatic control valve intelligent positioner in a nuclear power plant. The mechanical device for online replacement of a pneumatic control valve intelligent positioner in a nuclear power plant is suitable for the online replacement method of a pneumatic control valve intelligent positioner in a nuclear power plant provided in the above embodiments of the present application.

[0029] The online replacement mechanical device of the intelligent positioner of the pneumatic regulating valve of the nuclear power plant includes a supporting mechanism and an adjusting mechanism connected to each other. The adjusting mechanism is used to adjust the supporting mechanism to support the upper part of the valve yoke 6, limit the upward movement of the coupling 7, and cooperate with the valve hand wheel to fix the valve at the current opening.

[0030] The technical solution provided in the embodiment of the present application uses an adjustment mechanism to adjust the support mechanism to support the upper part of the valve yoke 6, restricting the upward movement of the coupling 7, and realizing the method of fixing the pneumatic regulating valve coupling 7 to restrict the movement of the valve in another direction, thereby fixing the valve at the current opening. The structure is simple and easy to install.

[0031] In at least one embodiment of the present application, reference Figure 2 and Figure 3 , the support mechanism includes a top block 1. The adjustment mechanism includes a left support block 2, a connecting bolt 3, a right support block 4 and an adjusting bolt 5. The left support block 2 and the right support block 4 form a clamp structure through the connecting bolt 3, and the connecting bolt 3 is connected to the left support block 2 by a thread. The adjusting bolt 5 is connected to the left support block 2 and the right support block 4 by a thread, and the distance between the top block 1 and the left support block 2 and the right support block 4 is changed by turning the adjusting bolt 5 to match the valve at any position between 0% and 100% of the opening. In this way, the online replacement mechanical device of the intelligent positioner of the pneumatic control valve of the nuclear power plant can be applied to the pneumatic control valve of the air-loss closing type with a movable spring seat under the actuator, and is installed between the top of the valve yoke 6 and the upper end face of the coupling 7 when in use.

[0032] In at least one embodiment of the present application, the top block 1 has an arc-shaped shape and a countersunk hole is opened at the bottom. The top block 1 is seated on the adjusting bolt 5 through the countersunk hole. In this way, the arc-shaped shape can prevent the device from interfering with the lower spring seat of the valve actuator when in use.

[0033] It should be noted that Figure 2 and Figure 3The shown online replacement mechanical device for the intelligent positioner of the pneumatic regulating valve of the nuclear power plant is a top block type online replacement mechanical device. When in use, the top block type online replacement mechanical device is placed on the upper end face of the valve coupling 7 of the intelligent positioner to be replaced, and the connecting bolt 3 passes through the light hole of the right support block 4 and is fixed to the left support block 2 by threaded connection. At this time, the top block 1 is still a distance away from the yoke 6. Turning the adjusting bolt 5 drives the top block 1 to move in the vertical direction, so that the top block 1 supports the upper part of the valve yoke 6, restricting the upward movement of the coupling 7, and cooperating with the valve handwheel to fix the valve at the current opening, so as to avoid the change of the valve position due to the misoperation of the air intake during online replacement.

[0034] In at least one embodiment of the present application, reference Figure 4 , the supporting mechanism includes a top plate 9. The adjusting mechanism includes a lead screw 10, a guide shaft 11 and a pressure plate 12. The external thread of the lead screw 10 cooperates with the internal thread of the guide shaft 11, and the distance between the top plate 9 and the pressure plate 12 is changed by adjusting the screw-in length of the lead screw 10 in the guide shaft 11 to match any position of the valve in the opening range of 0%-100%. In this way, the online replacement mechanical device of the intelligent positioner of the pneumatic regulating valve of the nuclear power plant can be applied to the pneumatic regulating valve fixed with the spring seat under the actuator, and is installed between the top of the yoke 6 and the upper end face of the coupling 7 for the valve of the air-loss closed type, and is installed between the valve packing gland 13 and the lower end face of the coupling 7 for the valve of the air-loss open type.

[0035] It should be noted that Figure 4 The online replacement mechanical device for the intelligent positioner of the pneumatic control valve of the nuclear power plant shown is a guide shaft type online replacement mechanical device. When the guide shaft type online replacement mechanical device is used for the pneumatic control valve of the air-loss closed type, the online replacement mechanical device is placed on the upper end face of the valve coupling 7 of the intelligent positioner to be replaced, and the screw 10 is turned to make the top plate 9 support the upper part of the valve yoke 6 to limit the upward movement of the coupling 7. With the valve handwheel, the valve is fixed at the current opening to avoid the change of the valve position caused by the wrong operation of the air intake during the online replacement. When used for the pneumatic control valve of the air-loss open type, the online replacement mechanical device is placed on the valve packing gland 13, and the screw 10 is turned to make the top plate 9 support the lower end face of the coupling 7 to limit the downward movement of the coupling 7, thereby fixing the valve at the current opening.

[0036] The online replacement mechanical device for the intelligent positioner of the pneumatic control valve in a nuclear power plant proposed in the above-mentioned embodiment of the present application has a simple structure, light weight, and convenient installation, and is suitable for various types of linear stroke pneumatic control valves.

[0037] It should be noted that the combination of the various technical features in the embodiments of the present application is not limited to the combination described in the embodiments of the present application or the combination described in the specific embodiments, and all technical features described in the present application can be freely combined or combined in any way unless there is a contradiction between them.

[0038] As shown in the specification and claims, unless the context clearly indicates an exception, the words "a", "an" and / or "the" do not refer to the singular and may also include the plural. Generally speaking, the term "comprising" only indicates that the steps and elements that have been clearly identified are included, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0039] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for online replacement of an intelligent positioner of a pneumatic control valve in a nuclear power plant, characterized in that: include: Physically mark the installation location of the original locator; In the debugging software provided with the smart positioner, read the information of the original positioner; Set the valve to manual mode, assign corresponding opening instructions to control the valve at the current opening, and limit the movement of the valve in a single direction through the handwheel; The pneumatic control valve intelligent positioner of the nuclear power plant is used to replace the mechanical device online to fix the pneumatic control valve coupling, restrict the movement of the valve in another direction, fix the valve at the current opening, and disconnect the air supply to the positioner; Remove the original positioner and install the positioner spare parts according to the original physical markings; Use the single-point calibration function of the debugging software to fill in the information of the original positioner in sequence, complete the setting of the positioner spare parts, and after confirming that the valve is in good condition, restore the air supply to the positioner and restore the valve to automatic mode; Dismantle the online replacement mechanical device of the intelligent positioner of the pneumatic control valve in the nuclear power plant and complete the online replacement of the intelligent positioner.

2. The method for online replacement of an intelligent positioner of a pneumatic control valve in a nuclear power plant according to claim 1, characterized in that: The information of the original positioner includes control type, amplifier type, pressure unit, maximum air supply pressure range, valve actuator information, valve debugging parameters and actual stroke parameters.

3. A mechanical device for online replacement of intelligent positioners of pneumatic control valves in nuclear power plants, characterized in that: It includes a supporting mechanism and an adjusting mechanism connected to each other. Among them, the adjustment mechanism is used to adjust the support mechanism to support the upper part of the valve yoke, limit the upward movement of the coupling, and cooperate with the valve handwheel to fix the valve at the current opening.

4. The on-line replacement mechanical device for the intelligent positioner of a pneumatic regulating valve in a nuclear power plant according to claim 3 is characterized in that: The supporting mechanism includes a top block, and the adjusting mechanism includes a left supporting block, a connecting bolt, a right supporting block and an adjusting bolt. The left supporting block and the right supporting block form a clamping structure through the connecting bolt. The connecting bolt is connected to the left supporting block through a thread. The adjusting bolt is connected to the left supporting block and the right supporting block through a thread. The distance between the top block and the left support block and the right support block is changed by turning the adjusting bolt to match any position of the valve in the range of 0%-100% opening.

5. The on-line replacement mechanical device for the intelligent positioner of a pneumatic regulating valve in a nuclear power plant according to claim 3 is characterized in that: The top block has an arc shape.

6. The on-line replacement mechanical device for the intelligent positioner of a pneumatic regulating valve in a nuclear power plant according to claim 3 is characterized in that: A countersunk hole is provided at the lower part of the top block, and the top block is seated on the adjusting bolt through the countersunk hole.

7. The on-line replacement mechanical device for the intelligent positioner of a pneumatic regulating valve in a nuclear power plant according to claim 3 is characterized in that: The supporting mechanism includes a top plate, the adjusting mechanism includes a lead screw, a guide shaft and a pressure plate, and the external thread of the lead screw matches the internal thread of the guide shaft; The distance between the top plate and the pressure plate is changed by adjusting the screw length of the lead screw in the guide shaft to match any position of the valve in the range of 0%-100% opening.

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