Immersion electrolytic decontamination device

Abstract

The present invention relates to an immersion electrolytic decontamination device, which includes a decontamination tank for containing electrolyte. A cathode support plate and a cathode plate are arranged in the decontamination tank. The first end of the cathode plate is detachably mounted on the cathode support plate through a fastener, and the cathode plate extends downward along the height direction of the decontamination tank; and an anode support plate for mounting a workpiece to be decontaminated. The cathode support plate extends along a direction parallel to the bottom wall of the decontamination tank, and the anode support plate is arranged parallel to the cathode support plate; it further includes a DC regulated power supply. The negative pole of the DC regulated power supply is connected to the cathode plate, and its positive pole is connected to the workpiece to be decontaminated. After conduction, decontamination treatment is carried out on the workpiece to be decontaminated. This device has the advantages of simple operation, high decontamination efficiency, and the reusable decontaminated metal components, reducing the operation cost. At the same time, it ensures that while using nuclear energy, the generated radioactive pollution is controlled below the safety standard, guaranteeing the safety of personnel, the environment and the public.

Description

Technical Field

[0001] The present invention relates to the field of nuclear environmental protection equipment, and particularly to an immersion electrolytic decontamination device. Background Art

[0002] Structural decontamination is an indispensable part in the operation of nuclear power plant equipment, especially the decontamination of radioactive contamination on the surface of metal materials is particularly important. At present, for the decontamination of the surfaces of equipment and workpieces made of metal materials at home and abroad, the traditional methods include physical methods and chemical methods. Although the physical methods and chemical methods are mature and widely used, there are many problems. For example, the physical method generates radioactive dust, which seriously endangers the health of operators and the environment, and may even generate explosive mixtures; the chemical method has problems such as a large amount of secondary waste generation and easy corrosion of equipment. The electrochemical decontamination method has attracted much attention due to its advantages such as good decontamination effect, high treatment efficiency, small amount of secondary waste liquid generation, and leveling effect on components.

[0003] Electrochemical decontamination has unique technical advantages in the field of decontamination of metal parts. A large number of metal parts, pipelines, valves and other items in nuclear power plants urgently need a method with reliable technology, feasible solution and high decontamination efficiency for decontamination. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an immersion electrolytic decontamination device.

[0005] The technical solution adopted by the present invention to solve its technical problems is: to construct an immersion electrolytic decontamination device, including a decontamination tank capable of accommodating electrolyte, a cathode support plate and a cathode plate are arranged in the decontamination tank, the first end of the cathode plate is detachably installed on the cathode support plate through a fastener, and the cathode plate extends downward along the height direction of the decontamination tank; and

[0006] An anode support plate for installing a workpiece to be decontaminated, the cathode support plate extends along a direction parallel to the bottom wall of the decontamination tank, and the anode support plate is arranged parallel to the cathode support plate;

[0007] It further includes a DC regulated power supply, the negative pole of the DC regulated power supply is connected to the cathode plate, and its positive pole is connected to the workpiece to be decontaminated. After conduction, decontamination treatment is carried out on the workpiece to be decontaminated.

[0008] Preferably, the cathode support plate is a first copper bar;

[0009] The anode support plate is a second copper bar.

[0010] Preferably, several support seats arranged at intervals are provided on the side wall of the decontamination tank;

[0011] The support base includes a support base body, and a step is provided at the center of the support base body facing the decontamination tank.

[0012] The cathode support plate is arranged on the step, and the anode support plate is arranged on the top of the support base body.

[0013] Preferably, a heater for heating and insulating the electrolyte is further provided in the decontamination tank.

[0014] Preferably, the decontamination tank is a square box structure made of 316L stainless steel.

[0015] An installation hole is provided on the side wall of the decontamination tank, and an exhaust device facing the installation hole and arranged outside the decontamination tank is further included. The exhaust device is used for exhausting the gas generated in the decontamination tank.

[0016] Preferably, an electrolyte circulating and filtering assembly connected to the decontamination tank is further included.

[0017] The electrolyte circulating and filtering assembly includes a liquid storage tank for containing the electrolyte. An infusion pipe connected to the upper part of the decontamination tank and used for inputting the electrolyte into the decontamination tank is provided at the upper part of the liquid storage tank.

[0018] A return pipe connected to the lower part of the decontamination tank is provided at the lower part of the liquid storage tank. A circulation pump and a filter are provided on the return pipe. The circulation pump pumps the electrolyte in the decontamination tank back into the liquid storage tank, and then it is transported into the decontamination tank through the infusion pipe to form a cycle.

[0019] Preferably, a liquid level sensor is provided inside the decontamination tank. The decontamination tank is provided with a water inlet pipe connected to an external water source, and a drain pipe is provided at its bottom.

[0020] Solenoid valves are provided on both the water inlet pipe and the drain pipe. The solenoid valves are connected to a controller. The controller controls the working states of the water inlet pipe and the drain pipe according to the liquid level data collected by the liquid level sensor.

[0021] Preferably, a drain pipe is further provided at the bottom end of the side wall of the decontamination tank.

[0022] A manual valve is provided on the drain pipe.

[0023] Preferably, a cover plate detachably connected to the decontamination tank is further included.

[0024] Preferably, the cover plate is connected to the decontamination tank through a flipping mechanism.

[0025] The flipping mechanism includes a cylinder support provided on the side wall of the decontamination tank, a cylinder connected to the cylinder support. The cylinder includes a cylinder body and a telescopic rod connected to the cylinder body. A cylinder connection seat is provided at the end of the telescopic rod.

[0026] A plurality of bearing seats are provided at the top of the side wall of the decontamination tank at intervals and in parallel. A shaft hole for a rotating shaft to pass through is provided at the end of the bearing seat away from the decontamination tank. The circumferential side wall of the rotating shaft is fixedly connected to the top of the cover plate through a connecting plate and connected to the cylinder connection seat through a connecting rod.

[0027] The cylinder drives the rotating shaft to rotate and then drives the cover plate to open and close.

[0028] Implementing the present invention has the following beneficial effects: This immersion electrolytic decontamination device is simple to operate, has high decontamination efficiency, and the metal components after decontamination have the advantages of being reusable, etc., reducing the operating cost. At the same time, it ensures that while using nuclear energy, the generated radioactive pollution is controlled below the safety standard, ensuring the safety of personnel, the environment and the public. Description of the Drawings

[0029] The present invention will be further described below in conjunction with the drawings and embodiments. In the drawings:

[0030] Figure 1 is a three-dimensional structural schematic diagram of the immersion electrolytic decontamination device of the present invention;

[0031] Figure 2 is a top view of the immersion electrolytic decontamination device (missing the cover plate) of the present invention;

[0032] Figure 3 is a front view of the immersion electrolytic decontamination device (partially transparent) of the present invention;

[0033] Figure 4 is a right view of the immersion electrolytic decontamination device of the present invention;

[0034] Figure 5 is a left view of the immersion electrolytic decontamination device of the present invention;

[0035] Figure 6 is a partial structural detail diagram inside the decontamination tank of the present invention. Detailed Embodiments

[0036] In order to have a clearer understanding of the technical features, objectives, and effects of the present invention, the specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientation or positional relationships indicated by terms such as "front", "rear", "upper", "lower", "left", "right", "longitudinal", "transverse", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail", etc. are based on the orientation or positional relationships shown in the accompanying drawings and are constructed and operated in a specific orientation, and are only for the convenience of describing the present technical solution, rather than indicating that the indicated device or element must have a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0037] It should also be noted that, unless otherwise clearly specified and defined, terms such as "installation", "connection", "attachment", "fixation", "setting", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located above the other element, or there may also be one or more intermediate elements. The terms "first", "second", "third", etc. are only for the convenience of describing the present technical solution and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third", etc. can explicitly or implicitly include one or more of such features. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation in order to thoroughly understand the embodiments of the present invention. However, those skilled in the art should clearly understand that the present invention can also be implemented in other embodiments without these specific details. In other cases, the detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present invention.

[0039] As Figures 1-5 shown, it is an immersion electrolytic decontamination device of the present invention, including a decontamination tank 1 that can hold electrolyte. The decontamination tank 1 is generally in the structure of a rectangular parallelepiped box, and its length is approximately twice its width. Of course, a cube structure or a cylindrical structure can also be selected, and it is made of 316L stainless steel. Of course, its structure, size, and material can also be selected and set according to requirements, and no specific limitations are made here.

[0040] Further, a cathode support plate 3 and a cathode plate 4 are provided in the decontamination tank 1. The first end of the cathode plate 4 is detachably mounted on the cathode support plate 3 through a fastener. The cathode plate 4 extends downward along the height direction of the decontamination tank 1, and an anode support plate 5 for mounting the workpiece to be decontaminated is provided. The cathode support plate 3 extends along a direction parallel to the bottom wall of the decontamination tank 1. The anode support plate 5 is arranged in parallel with the cathode support plate 3. A DC regulated power supply is also included. The negative electrode of the DC regulated power supply is connected to the cathode plate 4, and its positive electrode is connected to the workpiece to be decontaminated. After conduction, the workpiece to be decontaminated is decontaminated.

[0041] The cathode support plate 3 extends along the horizontal length direction of the side plate of the decontamination tank 1 to surround the inner wall of the side plate for one week. It can be formed by connecting the two ends of four cathode support plates 3 end to end to form a square ring structure. The anode support plate 5 is arranged in parallel with the cathode support plate 3 and can surround the inner wall of the decontamination tank 1 for one week, or one section or multiple sections.

[0042] Both the cathode support plate 3 and the anode support plate 5 are strip-shaped plate structures. A groove can also be provided on the upper surface of the anode support plate 5, and the groove can be in a "V" - shaped structure or a "U" - shaped structure.

[0043] Further, referring to Figure 6 , a plurality of support seats 2 arranged at intervals are provided on the side wall of the decontamination tank 1. The support seat 2 includes a support seat main body. A step is provided on the support seat main body facing the center of the decontamination tank 1. The above - mentioned cathode support plate 3 is arranged on the step and can be fixed to the step by bolts. Of course, it can also be directly welded to the step. There are various fixing methods, and specific limitations are not made here.

[0044] The anode support plate 5 is arranged on the top of the support seat main body. Of course, the anode support plate 5 can also be directly arranged on the inner side wall of the decontamination tank 1, or both ends are mounted on the side wall of the decontamination tank.

[0045] Further, there are multiple cathode plates 4 arranged at intervals, which can be evenly distributed at intervals. The first end of the cathode plate 4 is detachably fixed to the cathode support plate 3 through a fastener. Further, the first end of the cathode plate 4 is in a U - shaped groove structure, and both sides of the opening are mounted on the cathode support plate 3 through fasteners. The cathode plate 4 extends downward along the height direction of the decontamination tank 1, but its second end keeps a certain distance from the bottom wall of the decontamination tank 1. The fastener can be a fastening bolt, a screw. Of course, other components can also be selected, and specific limitations are not made here.

[0046] Further, a fixing plate 6 is also included, which is arranged on the side of the cathode plate 4 facing the inner side wall of the decontamination tank 1, and the fixing plate 6 is used to assist in fixing the cathode plate 4.

[0047] In this embodiment, the cathode support plate 3 is a first copper busbar, and the anode support plate 5 is a second copper busbar. It can be understood that both the cathode support plate 3 and the anode support plate 5 are made of copper busbars. Of course, other materials can also be used.

[0048] Furthermore, the above-mentioned DC regulated power supply can be installed on the outer side wall of the decontamination tank 1 or arranged separately. It is connected to the above-mentioned cathode plate 4 and the workpiece to be decontaminated (serving as the anode) through wires. The DC regulated power supply can be designed according to actual needs. For example, it can be designed with a power of 36 kVA, adjustable current from 0 to 1500 A, and adjustable voltage from 0 to 24 V.

[0049] Furthermore, a heater for heating and insulating the electrolyte is also provided in the decontamination tank 1 to keep the electrolyte within a suitable temperature range and maintain the decontamination efficiency. Furthermore, the decontamination tank 1 can also be provided with a temperature sensor to collect temperature data. Multiple temperature sensors can be set to obtain more accurate data.

[0050] Furthermore, an installation hole 101 is provided on the side wall of the decontamination tank 1, and an exhaust device (not shown) is provided outside the decontamination tank 1 facing the installation hole 101. The exhaust device is used to exhaust the gas generated in the decontamination tank 1.

[0051] Furthermore, the immersion electrolytic decontamination device further includes an electrolyte circulation and filtration assembly 7 connected to the decontamination tank 1, and its main function is to keep the electrolytic decontamination solution stable and clean at all times.

[0052] The electrolyte circulation and filtration assembly 7 includes a liquid storage tank 71 for containing the electrolyte. The liquid storage tank 71 includes a box body 711 with a cuboid structure. The height of the box body 711 is slightly lower than the height of the decontamination tank 1. Of course, the box body 711 can also be a circular cylindrical structure, etc. It can be made of 316L stainless steel.

[0053] Furthermore, the liquid storage tank 71 further includes a lid 712 detachably installed on the top of the box body 711. The lid 712 covers the area enclosed by the opening of the box body 711 for better sealing. Furthermore, a pull ring or a handle is provided on the top surface of the lid 712 to facilitate the operator to lift the lid 712. Furthermore, a sampling interface can also be provided on the box body 711 for sampling and detecting the electrolyte.

[0054] Furthermore, an infusion pipe 72 is provided at the upper part of the liquid storage tank 71 and is connected to the upper part of the decontamination tank 1 for inputting the electrolyte into the decontamination tank 1. It can be that a first interface penetrating the wall surface is provided on the side wall of the decontamination tank 1, a second interface penetrating the wall surface is provided on the side wall of the box body 711, and the infusion pipe 72 docks the first interface and the second interface. Furthermore, a one-way valve can be provided on the infusion pipe 72.

[0055] A return pipe 73 connected to the lower part of the decontamination tank 1 is provided at the lower part of the liquid storage tank 71, and a circulation pump 74 and a filter 75 are provided on the return pipe 73. The return pipe 73 may include a first tube body 731 connected to the lower part of the decontamination tank 1, and an elbow 732 connected to the end of the first tube body 731 away from the decontamination tank 1. The elbow 732 is bent downward, and its lower end is connected to the second tube body 733. The second tube body 733 is connected to the circulation pump 74. The circulation pump 74 is connected to the lower part of the box body 711 through a connecting pipe. The filter 75 is provided on the connecting pipe. Of course, the filter 75 can also be provided on any section of the return pipe 73. Furthermore, a flow meter, a pressure gauge, a thermometer, etc. are provided on the return pipe 73. A detection meter, such as a pressure gauge, etc. can also be provided. The return pipe 73 can also be provided with a one-way valve and a stop valve, etc.

[0056] In this embodiment, the circulation pump 74 and the liquid storage tank 71 are both disposed on a base 76 . A shock-absorbing pad 77 is disposed on the base 76 , and the circulation pump 74 is disposed on the shock-absorbing pad 77 .

[0057] The circulation pump 74 pumps the electrolyte in the decontamination tank 1 back to the liquid storage tank 71, and then transports it to the decontamination tank 1 through the infusion tube 72 to form a circulation. In conjunction with the aforementioned heater, the electrolyte in the decontamination tank 1 can be evenly heated to improve the decontamination effect.

[0058] Furthermore, a liquid level sensor is provided inside the decontamination tank 1, and the decontamination tank 1 is provided with a water inlet pipe connected to an external water source. The water inlet pipe can be arranged on the rear part of the decontamination tank 1, and can be a water inlet pipe with a 1-inch aperture. A drain pipe is provided at the bottom of the decontamination tank 1, and can be a drain pipe with a 2-inch aperture.

[0059] Furthermore, solenoid valves are provided on the water inlet pipe and the drainage pipe, and the solenoid valves are connected to the controller, and the controller controls the working state of the water inlet pipe and the drainage pipe through the liquid level data collected by the liquid level sensor. The controller is a PLC controller, which is equipped with a display screen, and the water level can be displayed on the display screen.

[0060] Furthermore, a drain pipe 8 is provided at the bottom end of the side wall of the decontamination tank 1, and a manual valve 9 is provided on the drain pipe 8, so that when the automatic drainage function of the decontamination tank 1 is lost, the manual valve 9 can be used to drain water or electrolyte or other decontamination liquid or cleaning liquid.

[0061] Furthermore, it also includes a cover plate 10 detachably connected to the decontamination tank 1. The cover plate 10 is connected to the decontamination tank 1 through a flip mechanism 11. The cover plate 10 can be made of 316L stainless steel.

[0062] The flipping mechanism 11 includes a cylinder support 111 provided on the side wall of the decontamination tank 1, a cylinder connected to the cylinder support 111. The cylinder includes a cylinder block 1121 and a telescopic rod 1122 connected to the cylinder block 1121. A cylinder connection seat 113 is provided at the end of the telescopic rod 1122. At the top of the side wall of the decontamination tank 1, several bearing seats 115 are arranged in parallel at intervals. For example, two bearing seats 115 can be arranged at intervals. An axial hole for a rotating shaft 116 to pass through is provided at the end of the bearing seat 115 away from the decontamination tank 1. The circumferential side wall of the rotating shaft 116 is fixedly connected to the top of the cover plate 10 through a connecting plate 117. The rotating shaft 116 is connected to the cylinder connection seat 113 through a connecting rod 114. When the cylinder works, it drives the rotating shaft 116 to rotate, thereby driving the cover plate 10 to open and close.

[0063] In this embodiment, the workpiece to be decontaminated (as the anode) is fixed to the anode support plate 5. After pouring the electrolyte into the decontamination tank 1, the DC regulated power supply is started, and then the decontamination treatment can be carried out. During this period, the heater and the electrolyte circulation and filtration assembly 7 can be started, etc.

[0064] After the special decontamination liquid (electrolyte) is loaded into the decontamination tank 1, functions such as high decontamination factor, high decontamination efficiency, short treatment time, and small amount of waste liquid generated can be achieved. This immersion electrolytic decontamination device has a wide range of applications and is dedicated to small components with complex shapes and strong adhesion of contaminants, such as stainless steel water pump impellers.

[0065] This immersion electrolytic decontamination device has the characteristics of simple operation, high decontamination efficiency, and uniform current distribution on the surface of the workpiece. After decontamination, the metal components can be reused, etc., which reduces the cost. The electrolyte can be applied in various industries of the nuclear fuel cycle, and has a broad market prospect.

[0066] The research and development of this immersion electrolytic decontamination device not only provides a special decontamination device for the electrochemical decontamination of nuclear power plants, but also puts forward a new idea and method for the electrochemical decontamination of other types of metal components in nuclear power plants. Furthermore, it ensures that while using nuclear energy, the generated radioactive pollution is controlled below the safety standard, ensuring the safety of personnel, the environment and the public.

[0067] It can be understood that the above embodiments only represent the preferred embodiments of the present invention, and the description is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can also be made, which all belong to the protection scope of the present invention. Therefore, all equivalent transformations and modifications made to the scope of the claims of the present invention shall fall within the scope covered by the claims of the present invention.

Claims

1. An immersion electrolytic decontamination device, characterized in that, It includes a decontamination tank (1) capable of accommodating electrolyte. A cathode support plate (3) and a cathode plate (4) are arranged in the decontamination tank (1). The first end of the cathode plate (4) is detachably mounted on the cathode support plate (3) through a fastener, and the cathode plate (4) extends downward along the height direction of the decontamination tank (1); and an anode support plate (5) for mounting the workpiece to be decontaminated. The cathode support plate (3) extends along a direction parallel to the bottom wall of the decontamination tank (1), and the cathode support plate (3) is arranged around the inner wall of the side plate of the decontamination tank (1) for one week. The anode support plate (5) surrounds the inner wall of the decontamination tank (1) for one week, or one or more segments. The anode support plate (5) is arranged parallel to the cathode support plate (3); several support seats (2) arranged at intervals are provided on the side wall of the decontamination tank (1); the support seat (2) includes a support seat main body, and a step is provided on the support seat main body facing the center of the decontamination tank (1); the cathode support plate (3) is arranged on the step, and the anode support plate (5) is arranged on the top of the support seat main body; a groove is further provided on the upper surface of the anode support plate (5), and the groove is in a "V" - shaped structure or a "U" - shaped structure; It further includes a DC regulated power supply. The negative electrode of the DC regulated power supply is connected to the cathode plate (4), and its positive electrode is connected to the workpiece to be decontaminated. After conduction, decontamination treatment is performed on the workpiece to be decontaminated.

2. The immersion electrolytic decontamination device according to claim 1, characterized in that, The cathode support plate (3) is a first copper row; The anode support plate (5) is a second copper row.

3. The immersion electrolytic decontamination device according to claim 1, characterized in that, A heater for heating and insulating the electrolyte is further provided in the decontamination tank (1).

4. The immersion electrolytic decontamination device according to claim 1, characterized in that, The decontamination tank (1) is a square box - shaped structure made of 316L stainless steel; An installation hole (101) is provided on the side wall of the decontamination tank (1), and an exhaust device is further provided outside the decontamination tank (1) facing the installation hole (101). The exhaust device is used to discharge the gas generated in the decontamination tank (1).

5. The immersion electrolytic decontamination device according to claim 1, wherein It further includes an electrolyte circulation and filtration assembly (7) connected to the decontamination tank (1); The electrolyte circulation and filtration assembly (7) includes a liquid storage tank (71) for accommodating electrolyte. An infusion pipe (72) connected to the upper part of the decontamination tank (1) and used to input electrolyte into the decontamination tank (1) is provided at the upper part of the liquid storage tank (71); A return pipe (73) connected to the lower part of the decontamination tank (1) is provided at the lower part of the liquid storage tank (71). A circulation pump (74) and a filter (75) are provided on the return pipe (73). The circulation pump (74) pumps the electrolyte in the decontamination tank (1) back into the liquid storage tank (71), and then transports it into the decontamination tank (1) through the infusion pipe (72) to form a cycle.

6. The immersion electrolytic decontamination device according to claim 1, characterized in that A liquid level sensor is provided inside the decontamination tank (1). The decontamination tank (1) is provided with a water inlet pipe connected to an external water source and a drain pipe at its bottom; Solenoid valves are provided on both the water inlet pipe and the drain pipe. The solenoid valves are connected to a controller, and the controller controls the working states of the water inlet pipe and the drain pipe based on the liquid level data collected by the liquid level sensor.

7. The immersion electrolytic decontamination device according to claim 1, characterized in that A drain pipe (8) is further provided at the bottom end of the side wall of the decontamination tank (1); A manual valve (9) is provided on the drain pipe (8).

8. The immersion electrolysis decontamination device according to claim 1, wherein It further includes a cover plate (10) detachably connected to the decontamination tank (1).

9. The immersion electrolytic decontamination device according to claim 8, characterized in that, The cover plate (10) is connected to the decontamination tank (1) through a flipping mechanism (11); The flipping mechanism (11) includes a cylinder support (111) provided on the side wall of the decontamination tank (1), a cylinder connected to the cylinder support (111). The cylinder includes a cylinder body (1121) and a telescopic rod (1122) connected to the cylinder body (1121). A cylinder connection seat (113) is provided at the end of the telescopic rod (1122); Several bearing seats (115) are provided at the top of the side wall of the decontamination tank (1) and arranged parallel at intervals; a shaft hole for a rotating shaft (116) to pass through is provided at the end of the bearing seat (115) away from the decontamination tank (1); the circumferential side wall of the rotating shaft (116) is fixedly connected to the top of the cover plate (10) through a connecting plate (117), and is connected to the cylinder connection seat (113) through a connecting rod (114); The cylinder drives the rotating shaft (116) to rotate and then drives the cover plate (10) to open and close.

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