A decontamination system for conductive materials contaminated with radionuclides

Abstract

The invention discloses a decontamination system for conductive materials contaminated by radioactive nuclides, comprising an electric spark discharge subsystem, a coolant and contaminant collection subsystem, a visualization subsystem and a transmission subsystem; the electric spark discharge subsystem comprises an electric spark power supply and control device, a power control line, X-direction and Y-direction feeding components and an electric spark decontamination electrode; the coolant and contaminant collection subsystem comprises a coolant supply tank, a coolant supply pipeline, a processing box, a coolant recovery pipeline and a waste liquid collection tank; the visualization subsystem comprises a video display and control device, a video power control transmission line and a camera; the transmission subsystem comprises a mechanical arm; the system is used for decontamination treatment of conductive materials contaminated by radioactive nuclides and collection of removed contaminants, and is particularly used for decontamination treatment of conductive materials contaminated by radioactive nuclides in underwater and special-shaped narrow spaces and collection of removed contaminants.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear engineering, in particular to a decontamination system for conductive materials contaminated by radioactive nuclides, and in particular to a special electric spark decontamination system for conductive materials contaminated by radioactive nuclides in underwater or special-shaped narrow spaces of nuclear engineering. Background Art

[0002] During the overhaul and decommissioning of nuclear facilities, most of the metal pollutants are surface contamination. In addition, there are some hot spots in nuclear facilities such as hot rooms and high-level waste storage tanks, and most of them are underwater and in special-shaped narrow spaces. The radiation level is very high, and it is very difficult to remove and decontaminate the hot spots, and the removed pollutants are not easy to collect. In order to achieve the clean release or recycling of contaminated metal items, it is planned to design a new type of electric spark decontamination system suitable for conductive materials in underwater and special-shaped narrow spaces, which is used to decontaminate conductive materials contaminated by radioactive nuclides and collect the removed pollutants. Summary of the invention

[0003] In order to achieve clean release or recycling of conductive materials contaminated by radioactive nuclides, the present invention provides a decontamination system for conductive materials contaminated by radioactive nuclides, which is used for decontamination of conductive materials contaminated by radioactive nuclides and collection of removed pollutants, and is particularly used for decontamination of conductive materials contaminated by radioactive nuclides and collection of removed pollutants underwater or in special-shaped and narrow spaces.

[0004] The present invention is achieved through the following technical solutions:

[0005] A decontamination system for conductive materials contaminated by radioactive nuclides, comprising an electric spark discharge subsystem, a coolant and contaminant collection subsystem, a visualization subsystem and a transmission subsystem; the electric spark discharge subsystem comprises an electric spark power supply and control device, a power control line, an X-direction and a Y-direction feeding assembly and an electric spark decontamination electrode; the coolant and contaminant collection subsystem comprises a coolant supply tank, a coolant supply pipeline, a processing box, a coolant recovery pipeline and a waste liquid collection tank; the visualization subsystem comprises a video display and control device, a video power control transmission line and a camera; the transmission subsystem comprises a mechanical arm; the electric spark power supply and control device are connected to the X-direction and the Y-direction feeding assembly through the power control line The electric spark decontamination electrode is electrically connected; the X-direction and Y-direction feeding components and the electric spark decontamination electrode are installed in the processing box, and the X-direction and Y-direction feeding components are used to drive the electric spark decontamination electrode to move along the X direction and / or Y direction; the input end of the coolant supply pipeline is connected to the coolant supply box, and the output end is connected to the coolant inlet of the processing box; the open end of the processing box is used to seal and contact with the working surface; the input end of the coolant recovery pipeline is connected to the coolant outlet of the processing box, and the output end is connected to the input end of the waste liquid collection box; the video display and control device is connected to the camera through the video power control transmission line, and the camera is installed in the processing box; the working end of the robot arm is used to drive the processing box to reach the decontamination processing position.

[0006] The decontamination system provided by the present invention is used for decontamination of conductive materials contaminated by radionuclides and collection of removed pollutants, and is particularly used for decontamination of conductive materials contaminated by radionuclides underwater or in special-shaped narrow spaces and collection of removed pollutants. The working principle is as follows:

[0007] The EDM power supply and control device provide power for EDM discharge, control the X-direction and Y-direction feed components to move and feed during the decontamination process, and the power control line supplies power to the electrode motor and transmits control signals; the X-direction and Y-direction feed components are used to drive the EDM decontamination electrode to move along the X-direction and / or Y-direction, that is, to ensure that the EDM decontamination electrode moves effectively in the working surface and accurately decontaminates the contamination points; the EDM decontamination electrode is used to discharge and decontaminate the conductive materials contaminated by radioactive nuclides. The coolant supply tank provides working fluid for EDM decontamination, which enters the processing box through the coolant inlet; the processing box provides rail support for the X-direction and Y-direction feed components, and provides support and fixation for the camera. The coolant flows out of the processing box through the coolant outlet and enters the waste liquid collection box through the coolant recovery pipeline for recovery. The video display and control device displays the EDM decontamination process, the video power supply control transmission line supplies power and video, and the camera shoots the EDM decontamination process. The processing box is driven by the robotic arm to the decontamination processing position.

[0008] Further preferably, the X-direction and Y-direction feeding components adopt a screw transmission mechanism.

[0009] Further preferably, the X-direction and Y-direction feed assemblies include an X-direction lead screw transmission mechanism and a Y-direction lead screw transmission mechanism; the fixed end of the X-direction lead screw transmission mechanism is installed in the processing box, the fixed end of the Y-direction lead screw transmission mechanism is installed at the sliding end of the X-direction lead screw transmission mechanism, and the electric spark decontamination electrode is installed at the sliding end of the Y-direction lead screw transmission mechanism.

[0010] The present invention drives a processing box to a decontamination processing position by a mechanical arm, and then adjusts the movement of an electric spark decontamination electrode along the X direction or the Y direction by controlling an X-direction and a Y-direction feeding assembly, so as to accurately adjust the working end position of the electric spark decontamination electrode, so that the working end of the electric spark decontamination electrode is aligned with the stain to be removed on the working surface to perform the decontamination operation.

[0011] Further preferably, along the coolant supply flow direction, a liquid supply pump, a liquid supply pump outlet valve and a coolant flow meter are sequentially arranged on the coolant supply pipeline.

[0012] The liquid supply pump delivers working fluid for electric spark decontamination, the liquid supply pump outlet valve is used to adjust the flow rate of the working fluid, and the coolant flow meter is used to display the flow value of the working fluid.

[0013] Further preferably, a coolant check valve is also provided on the coolant supply pipeline downstream of the coolant flowmeter.

[0014] The invention provides a coolant check valve on the coolant supply pipeline to prevent the working fluid from flowing back.

[0015] Further preferably, the open end of the processing box is provided with a flexible sealing gasket for pressing and sealing contact with the working surface.

[0016] The flexible sealing gasket is a flexible sealing gasket that can seal the special-shaped surface. The processing box is attached to the working surface through the flexible sealing gasket, and a closed chamber is formed between the processing box and the working surface to ensure that the working fluid in the processing box does not leak during the decontamination process.

[0017] Further preferably, the coolant and pollutant collection subsystem also includes a sedimentation centrifuge, a solid waste collection box and a filtering device; along the coolant recovery flow direction, a sedimentation centrifuge and a filtering device are sequentially provided on the coolant recovery pipeline, an output pipeline of the liquid separated by the sedimentation centrifuge is connected to the filtering device, and an output pipeline of the pollutants separated by the sedimentation centrifuge is connected to the solid waste collection box; an output pipeline of the liquid separated by the filtering device is connected to the waste liquid collection box.

[0018] The coolant after decontamination work enters the sedimentation centrifuge, which is used to separate the pollutants in the working fluid that are removed by the electric spark. The pollutants are collected in the solid waste collection box and the liquid enters the filtering device; the filtering device is used to filter the pollutants in the working fluid that are removed by the electric spark, and the filtered liquid enters the waste liquid collection box for collection, recovery and recycling.

[0019] Further preferably, a coolant outlet flow meter, a coolant reflux pump and a reflux pump outlet valve are sequentially provided on the coolant recovery pipeline located upstream of the sedimentation centrifuge.

[0020] The coolant outlet flow meter is used to display the working fluid outlet flow value, the coolant reflux pump is used to transport the working fluid, and the reflux pump outlet valve is used to adjust the working fluid flow transported by the coolant reflux pump.

[0021] Further preferably, the transmission subsystem adopts a hydraulic transmission subsystem, which includes a hydraulic oil tank connected to a pressure-transmitted telescopic steering robot arm through a hydraulic pipeline, and the working end of the pressure-transmitted telescopic steering robot arm is used to drive the processing box to the decontamination processing position.

[0022] Further preferably, along the hydraulic oil supply direction, a hydraulic pump, a hydraulic oil outlet regulating valve and a pressure gauge are sequentially provided on the hydraulic pipeline.

[0023] The hydraulic oil tank provides hydraulic oil to the hydraulic pump, the hydraulic pump provides hydraulic energy, the hydraulic oil outlet regulating valve adjusts the hydraulic energy, the pressure gauge displays the hydraulic pressure value, and the pressure transmission telescopic steering mechanical arm enables the processing box to reach the decontamination processing position.

[0024] The present invention has the following advantages and beneficial effects:

[0025] A new type of electric spark decontamination system suitable for conductive materials in underwater and irregular and narrow spaces solves the problem of conductive materials contaminated by radioactive nuclides, especially in underwater and irregular and narrow spaces, to carry out visual decontamination treatment and collection of removed pollutants, thereby achieving clean release or recycling of pollutant items and collection of removed pollutants. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0027] Figure 1 It is a schematic diagram of the structure of the decontamination system of the present invention.

[0028] Marks and corresponding parts names in the attached drawings:

[0029] 1-spark power supply and control device, 2-power control line, 3-servo motor device, 4-screw, 5-screw transmission device, 6-stepping motor, 7-spark decontamination electrode, 8-coolant supply tank, 9-supply pump, 10-supply pump outlet valve, 11-coolant flow meter, 12-coolant check valve, 13-coolant inlet, 14-processing box, 15-flexible sealing pad, 16-coolant outlet, 17-coolant outlet flow meter, 18-coolant reflux pump, 19-reflux pump outlet valve, 20-sedimentation centrifuge, 21-solid waste collection box, 22-filtering device, 23-waste liquid collection box, 24-video display and control device, 25-video power control transmission line, 26-camera, 27-hydraulic oil tank, 28-hydraulic pump, 29-hydraulic oil outlet regulating valve, 30-pressure gauge, 31-pressure transmission telescopic steering mechanical arm. DETAILED DESCRIPTION

[0030] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention. Example

[0031] This embodiment provides a decontamination system for conductive materials contaminated by radioactive nuclides, which is composed of an electric spark discharge subsystem, a coolant and contaminant collection subsystem, a visualization subsystem, and a hydraulic transmission subsystem. The composition and connection relationship of each subsystem are described in detail:

[0032] 1. Electric spark discharge subsystem:

[0033] It includes an electric spark power supply and control device 1, a power control line 2, X-direction and Y-direction feeding components and an electric spark decontamination electrode 7;

[0034] Among them, the X-direction and Y-direction feeding components adopt a screw transmission mechanism, specifically, the X-direction and Y-direction feeding components include an X-direction screw transmission mechanism and a Y-direction screw transmission mechanism; for example, the fixed end of the X-direction screw transmission mechanism is installed in the processing box 14, the fixed end of the Y-direction screw transmission mechanism is installed at the sliding end of the X-direction screw transmission mechanism, and the electric spark decontamination electrode 7 is installed at the sliding end of the Y-direction screw transmission mechanism. The optimized design adopts a servo motor device 3, a screw 4, a screw transmission device 5 and a stepper motor 6. With the parallel screw 4 as the X direction, the servo motor device 3 adjusts the X direction, the screw transmission device 5 adjusts the Y direction, and the stepper motor 6 adjusts the Z direction and the decontamination depth; when the surface of the decontaminated item is to be decontaminated, the servo motor device 3 is adjusted to adjust the X direction, the screw transmission device 5 adjusts the Y direction, and the stepper motor 6 adjusts the Z direction to perform initial positioning first, and then the servo motor device 3 is adjusted to adjust the X direction, the screw transmission device 5 adjusts the Y direction, and the stepper motor 6 adjusts the Z direction according to the decontamination path set by the control system to perform decontamination.

[0035] 2. The coolant and pollutant collection subsystem includes a coolant supply tank 8, a coolant supply pipeline, a processing tank 14, a coolant recovery pipeline and a waste liquid collection tank 23;

[0036] Along the coolant supply flow direction, a coolant supply pump 9, a coolant supply pump outlet valve 10, a coolant flow meter 11 and a coolant check valve 12 are sequentially arranged on the coolant supply pipeline.

[0037] The open end of the processing box 14 is provided with a flexible sealing gasket 15 for pressing and sealing contact with the working surface.

[0038] Along the coolant recovery flow direction, the coolant recovery pipeline is sequentially provided with a coolant outlet flow meter 17, a coolant reflux pump 18, a reflux pump outlet valve 19, a sedimentation centrifuge 20 and a filtering device 22; the liquid output pipeline separated by the sedimentation centrifuge 20 is connected to the filtering device 22, and the pollutant output pipeline separated by the sedimentation centrifuge 20 is connected to the solid waste collection box 21; the liquid output pipeline separated by the filtering device 22 is connected to the waste liquid collection box 23.

[0039] 3. The visualization subsystem includes a video display and control device 24, a video power control transmission line 25 and a camera 26;

[0040] 4. The hydraulic transmission subsystem includes a hydraulic oil tank 27 connected to a pressure transmission telescopic steering mechanical arm 31 through a hydraulic pipeline. The working end of the pressure transmission telescopic steering mechanical arm 31 is used to drive the processing box 14 to the decontamination processing position. Along the hydraulic oil supply direction, a hydraulic pump 28, a hydraulic oil outlet regulating valve 29 and a pressure gauge 30 are arranged in sequence on the hydraulic pipeline.

[0041] The electric spark power supply and control device 1 is electrically connected to the X-direction and Y-direction feeding components and the electric spark decontamination electrode 7 through the power supply control line 2; the X-direction and Y-direction feeding components and the electric spark decontamination electrode 7 are installed in the processing box 14, and the X-direction and Y-direction feeding components are used to drive the electric spark decontamination electrode 7 to move along the X direction and / or the Y direction. The input end of the coolant supply pipeline is connected to the coolant supply tank 8, and the output end is connected to the coolant inlet 13 of the processing box 14; the open end of the processing box 14 is used to seal and contact with the working surface; the input end of the coolant recovery pipeline is connected to the coolant outlet 16 of the processing box 14, and the output end is connected to the input end of the waste liquid collection box 23. The video display and control device 24 is connected to the camera 26 through the video power control transmission line 25, and the camera 26 is installed in the processing box 14; the working end of the pressure transmission telescopic steering mechanical arm 31 is used to drive the processing box 14 to reach the decontamination processing position.

[0042] The present embodiment provides a decontamination system for conductive materials contaminated by radionuclides, which is a new type of electric spark decontamination system suitable for conductive materials in underwater and special-shaped narrow spaces. The specific implementation method is as follows:

[0043] The hydraulic pump 28 is turned on to extract hydraulic oil from the hydraulic oil tank 27. The hydraulic pressure value displayed on the pressure gauge 30 is adjusted by adjusting the hydraulic oil outlet regulating valve 29 to provide hydraulic energy to the pressure transmission telescopic steering mechanical arm 31 so that the pressure transmission telescopic steering mechanical arm 31 can send the processing box 14 to the decontamination processing position through telescopic steering, and the flexible sealing pad 15 is closely attached to the decontamination material to ensure that the working fluid does not leak during the decontamination process.

[0044] Turn on the video display and control device 24, and turn on the camera 26 through the video power control transmission line 25;

[0045] Turn on the liquid supply pump 9, extract the working liquid from the coolant supply tank 8, adjust the working liquid flow value of the coolant flow meter 11 through the liquid supply pump outlet valve 10, and the working liquid enters the processing tank 14 through the coolant check valve 12 and the coolant inlet 13;

[0046] Turn on the electric spark power supply and control device 1 to control the servo motor device 3, the lead screw 4, the lead screw transmission device 5, and the stepping motor 6 through the power control line 2 to realize the electric spark decontamination electrode 7 to discharge and decontaminate the conductive material contaminated by the radioactive nuclides;

[0047] Turn on the coolant reflux pump 18, open the reflux pump outlet valve 19 and adjust the flow value of the coolant outlet flowmeter 17, so that the working fluid flows out of the processing box 14 from the coolant outlet 16, and the working fluid enters the sedimentation centrifuge 20. The pollutants removed by the electric spark erosion in the working fluid are separated by the sedimentation centrifuge 20 and enter the solid waste collection box 21. The working fluid flows out of the sedimentation centrifuge 20 again, and the pollutants removed by the electric spark erosion in the working fluid are filtered again by the filtering device 22. The filtered working fluid is collected in the waste liquid collection box 23.

[0048] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A decontamination system for conductive materials contaminated by radionuclides, characterized in that: It includes the spark discharge subsystem, coolant and contaminant collection subsystem, visualization subsystem and transmission subsystem; The electric spark discharge subsystem comprises an electric spark power supply and control device (1), a power supply control line (2), an X-direction and a Y-direction feeding assembly and an electric spark decontamination electrode (7); The coolant and pollutant collection subsystem comprises a coolant supply tank (8), a coolant supply pipeline, a processing tank (14), a coolant recovery pipeline and a waste liquid collection tank (23); The visualization subsystem includes a video display and control device (24), a video power control transmission line (25) and a camera (26); The transmission subsystem includes a mechanical arm; The electric spark power supply and control device (1) is electrically connected to the X-direction and Y-direction feeding components and the electric spark decontamination electrode (7) via a power control line (2); the X-direction and Y-direction feeding components and the electric spark decontamination electrode (7) are installed in a processing box (14), and the X-direction and Y-direction feeding components are used to drive the electric spark decontamination electrode (7) to move along the X-direction and / or Y-direction; The input end of the coolant supply pipeline is connected to the coolant supply tank (8), and the output end is connected to the coolant inlet (13) of the processing tank (14); the open end of the processing tank (14) is used for sealing contact with the working surface; the input end of the coolant recovery pipeline is connected to the coolant outlet (16) of the processing tank (14), and the output end is connected to the input end of the waste liquid collection tank (23); The video display and control device (24) is connected to a camera (26) via a video power control transmission line (25), and the camera (26) is installed in the processing box (14); The working end of the mechanical arm is used to drive the processing box (14) to reach the decontamination processing position.

2. A decontamination system for conductive materials contaminated by radionuclides according to claim 1, characterized in that: The X-direction and Y-direction feeding components adopt a screw transmission mechanism.

3. A decontamination system for conductive materials contaminated by radionuclides according to claim 2, characterized in that: The X-direction and Y-direction feeding components include an X-direction lead screw transmission mechanism and a Y-direction lead screw transmission mechanism; The fixed end of the X-direction lead screw transmission mechanism is installed in the processing box (14), the fixed end of the Y-direction lead screw transmission mechanism is installed on the sliding end of the X-direction lead screw transmission mechanism, and the electric spark decontamination electrode (7) is installed on the sliding end of the Y-direction lead screw transmission mechanism.

4. A decontamination system for conductive materials contaminated by radionuclides according to claim 1, characterized in that: Along the coolant supply flow direction, a coolant supply pump (9), a coolant supply pump outlet valve (10) and a coolant flow meter (11) are sequentially arranged on the coolant supply pipeline.

5. A decontamination system for conductive materials contaminated by radionuclides according to claim 4, characterized in that: A coolant check valve (12) is also provided on the coolant supply pipeline located downstream of the coolant flow meter (11).

6. A decontamination system for conductive materials contaminated by radionuclides according to claim 1, characterized in that: The open end of the processing box (14) is provided with a flexible sealing pad (15) for pressing and sealing against the working surface.

7. A decontamination system for conductive materials contaminated by radionuclides according to claim 1, characterized in that: The coolant and pollutant collection subsystem further comprises a sedimentation centrifuge (20), a solid waste collection box (21) and a filtering device (22); along the coolant recovery flow direction, the sedimentation centrifuge (20) and the filtering device (22) are sequentially arranged on the coolant recovery pipeline; the liquid output pipeline separated by the sedimentation centrifuge (20) is connected to the filtering device (22); the pollutant output pipeline separated by the sedimentation centrifuge (20) is connected to the solid waste collection box (21); and the liquid output pipeline separated by the filtering device (22) is connected to the waste liquid collection box (23).

8. A decontamination system for conductive materials contaminated by radionuclides according to claim 7, characterized in that: A coolant outlet flow meter (17), a coolant reflux pump (18) and a reflux pump outlet valve (19) are sequentially arranged on a coolant recovery pipeline located upstream of the sedimentation centrifuge (20).

9. A decontamination system for conductive materials contaminated by radionuclides according to claim 1, characterized in that: The transmission subsystem adopts a hydraulic transmission subsystem, which includes a hydraulic oil tank (27) connected to a pressure transmission telescopic steering mechanical arm (31) through a hydraulic pipeline, and the working end of the pressure transmission telescopic steering mechanical arm (31) is used to drive the processing box (14) to reach the decontamination processing position.

10. A decontamination system for conductive materials contaminated by radionuclides according to claim 9, characterized in that: Along the hydraulic oil supply direction, the hydraulic pipeline is provided with a hydraulic pump (28), a hydraulic oil outlet regulating valve (29) and a pressure gauge (30) in sequence.

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