A radioactive exhaust gas treatment device

Abstract

The utility model discloses a radioactive waste gas treatment device, including the seal chamber and nuclear radiation shielding room of inside and outside setting, the seal chamber is the closed production environment for the nuclide production equipment, is provided with carrier gas import and air outlet respectively on the seal chamber, carrier gas import and air outlet are connected to the outside of nuclear radiation shielding room through the pipeline sealed connection with it respectively, keep the circulation of the gas in the seal chamber, the directional discharge aerosol in the seal chamber. The nuclear radiation shielding room of the application forms the primary containment in the whole production process, is equipped with the seal chamber in the nuclear radiation shielding room, covers the production equipment outside, carries out the secondary containment treatment in the nuclide production process, the carrier gas import and air outlet of seal chamber are connected to the outside of nuclear radiation shielding room respectively, keep the circulation of the gas in the seal chamber, the directional discharge aerosol in the seal chamber, solve the problem that the internal equipment of hot chamber adopts direct installation mode in the prior art, and the problem that leakage is easy to occur.

Description

Technical Field

[0001] This utility model relates to the field of radioactive gas treatment technology in the process of nuclide production, and specifically to a radioactive waste gas treatment device in the process of nuclide production. Background Technology

[0002] Radioactive nuclides, such as medical isotopes, generate radioactive gases during production. This is particularly true in the large-scale production of 225Ac and 212Pb using electron accelerator photonuclear reaction with 226Ra as the target material. The amount of 226Ra used reaches the gram level, generating a large quantity of 222Rn radioactive gas. Improper handling of these gases poses risks to the environment and the health of workers. Currently, the production process of radionuclides mainly employs hot chambers and exhaust filtration systems to prevent the leakage of radioactive gases and aerosols. However, this method has shortcomings: the equipment inside the hot chamber is directly installed, and the gases or aerosols generated during production are easily volatilized and fill the entire hot chamber. Furthermore, there are many channels inside and outside the hot chamber, and although sealing measures are taken, leaks are still possible. Utility Model Content

[0003] To address this issue, this novel patent discloses a radioactive waste gas treatment device that performs secondary containment treatment on the radioactive waste gas, placing the radionuclide production equipment in a sealed environment. The radioactive gas is confined to a small area within the secondary containment, and is then purged and properly disposed of using a carrier gas. This solves the problem in the prior art where the equipment inside the hot chamber is directly installed, allowing gases or aerosols generated during production to easily evaporate and fill the entire hot chamber. Although sealing measures are implemented, leaks are still possible due to the numerous channels inside and outside the hot chamber. The specific solution is as follows: A radioactive waste gas treatment device, the device comprising an inner and outer sealed chamber and a nuclear radiation shielding chamber; The sealed chamber provides a closed production environment for the radionuclide production equipment. The sealed chamber is equipped with a carrier gas inlet and an exhaust gas outlet. The carrier gas inlet and the exhaust gas outlet are respectively connected to the outside of the nuclear radiation shielding room through pipes that are sealed to them, so as to maintain the gas circulation inside the sealed chamber and directionally discharge the aerosol inside the sealed chamber.

[0004] Preferably, one end of the pipe connected to the carrier gas inlet is connected to the carrier gas inlet, and the other end is connected to positive pressure nitrogen. One end of the pipe connected to the exhaust outlet is connected to the exhaust outlet, and the other end is connected to a negative pressure exhaust device.

[0005] Preferably, a gas collection hood is provided at the gas extraction outlet; The gas collection hood is installed outside the sealed exterior.

[0006] Preferably, the sealed chamber meets the load-bearing requirements for negative pressure.

[0007] Preferably, the sealed chamber includes a load-bearing frame and a sealing layer covering the load-bearing frame.

[0008] Preferably, the sealing layer includes a transparent plexiglass layer covering the periphery of the load-bearing frame and steel plates disposed at the top and bottom of the load-bearing frame; The steel plate and the transparent plexiglass layer are respectively sealed and connected to the load-bearing frame.

[0009] Preferably, a loading / unloading door is provided on one side of the sealed chamber; A drive assembly is provided between the loading / unloading door and the sealed chamber; The drive assembly is connected to the sealed chamber and the loading / unloading door respectively, and the drive assembly is used to realize the opening of the loading / unloading door. Adjustment of the opening and closing diameter.

[0010] Preferably, the drive component includes a controller and a flipping component; The flipping assembly includes a drive rod and a flipping rod assembly; Two sets of the flip-rod assembly are provided on both sides of the loading and unloading door; The flipping rod assembly includes two curved rods with openings facing each other and spaced apart, as well as an active rod; The active rods are located on opposite sides of the pick-up and put-down doors, and one end of each active rod is connected to the outside of the sealed chamber on opposite sides of the pick-up and put-down doors. One end of each of the two curved rods is rotatably connected to the inside of the take-up and put-down door, and the other end of each of the two curved rods is rotatably connected to the other end of the drive rod. The drive rod is perpendicular to the loading and unloading door and is located on one of the opposite sides of the loading and unloading door. One end of the drive rod is mounted on... Installed on the side wall of the sealed chamber, the other end of the drive rod is rotatably connected to the active rod. The other end of the drive rod connected to the active rod is a telescopic end, and the active rod is pushed to move horizontally by telescopic movement, thereby driving the two curved rods to rotate, so as to realize the opening and closing of the door and the adjustment of the opening diameter. The controller is wirelessly connected to the controller of the drive rod.

[0011] Preferably, the drive rod is either a hydraulic rod or an electric telescopic rod.

[0012] Compared with the prior art, the beneficial effects of this application are as follows: This application utilizes a sealed chamber and a nuclear radiation shielding chamber, both internally and externally configured. The nuclear radiation shielding chamber forms the primary containment for the entire production process. The sealed chamber, located within the nuclear radiation shielding chamber and enclosing the production equipment, creates a closed environment for the radionuclide production equipment. This provides secondary containment treatment for the radioactive waste gas generated during radionuclide production, further reducing the emission range of the radioactive waste gas and confining it to a small area within the secondary containment. Simultaneously, the carrier gas inlet and exhaust outlet of the sealed chamber are connected to the outside of the nuclear radiation shielding chamber via sealed pipes, maintaining gas circulation within the sealed chamber and directionally discharging aerosols from the sealed chamber. This effectively cleans and properly treats the secondary containment through the carrier gas, addressing the problem in the prior art where the equipment inside the hot chamber is directly installed, leading to the easy volatilization and filling of the entire hot chamber by the generated gases or aerosols. The hot chamber has many channels both inside and outside, and despite sealing measures, leaks are still likely to occur. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of a radioactive waste gas treatment device in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of a radioactive waste gas treatment device in the open state of a sealed chamber in an embodiment of this application. Figure 3 This is a side sectional view of a sealed chamber in a radioactive waste gas treatment device according to an embodiment of this application; Figure 4 This is a schematic diagram of the sealed chamber in the working state of a radioactive waste gas treatment device according to an embodiment of this application. Figure 5 This is a schematic diagram of the load-bearing frame in a radioactive waste gas treatment device according to an embodiment of this application; In the diagram: 1. Sealing strip; 2. Access door; 3. Gas collection hood; 4. Top plate; 5. Load-bearing frame; 6. Handle; 7. Transparent plexiglass layer; 8. First crank rod; 9. Carrier gas inlet; 10. Front door frame; 11. Base plate; 12. Second crank rod; 13. Active rod; 14. Drive rod; 15. Mounting base; 16. Nuclear radiation shielding room. Detailed Implementation

[0014] The technical solutions of the embodiments of this novel invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this novel invention, and not all of them. Based on the embodiments of this novel invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this novel invention.

[0015] Please see Figure 1-5This utility model provides a radioactive waste gas treatment device, which includes a sealed chamber and a nuclear radiation shielding chamber 16 arranged inside and outside; The sealed chamber provides a closed production environment for the radionuclide production equipment. The sealed chamber is equipped with a carrier gas inlet 9 and an exhaust outlet. The carrier gas inlet 9 and the exhaust outlet are respectively connected to the outside of the nuclear radiation shielding chamber 16 through pipes that are sealed to them, so as to maintain the gas circulation inside the sealed chamber and directionally discharge the aerosol inside the sealed chamber.

[0016] It should be noted that: In one embodiment of this application, the nuclear radiation shielding room 16 is a conventional hot room in the industry, and the nuclear radiation shielding room 16 serves as a primary containment structure to shield radiation during the production process.

[0017] The sealed chamber is installed inside the nuclear radiation shielding chamber 16 to provide a sealed production environment for the radionuclide production equipment and to provide secondary enclosure for the production equipment.

[0018] Furthermore, one end of the pipe connected to the carrier gas inlet is connected to the carrier gas inlet, and the other end is connected to positive pressure nitrogen. One end of the pipe connected to the exhaust outlet is connected to the exhaust outlet, and the other end is connected to a negative pressure exhaust device.

[0019] It should be noted that: The carrier gas inlet 9 is located on one side of the sealed chamber (specifically, on one side of the periphery of the sealed chamber in one embodiment of this application), and is connected to a positive pressure nitrogen source outside the nuclear radiation shielding chamber 16 through a pipeline. That is, one end of the pipeline is sealed and connected to the carrier gas inlet 9, and the other end is sealed and connected to the positive pressure nitrogen source. Nitrogen, as the carrier gas, can push the aerosol in the sealed chamber to flow towards the exhaust outlet to achieve gas circulation.

[0020] The exhaust outlet is located on the other side of the sealed chamber (specifically, the top of the sealed chamber in one embodiment of this application), and the exhaust outlet is connected to a negative pressure ventilation device located outside the nuclear radiation shielding room 16 via a pipe.

[0021] Furthermore, a gas collecting hood 3 is provided at the exhaust outlet. The gas collecting hood 3 is connected to the exhaust outlet and is installed on the top outside of the sealed chamber. One end of the gas collecting hood 3 is connected to the exhaust outlet. The two ends of the pipe are respectively connected to the outlet of the gas collecting hood 3 and a negative pressure ventilation device (specifically a negative pressure pump in one embodiment of this application) located outside the nuclear radiation shielding room 16, for directional extraction and discharge of radioactive aerosols in the sealed chamber.

[0022] Furthermore, the sealed chamber meets the load-bearing requirements for negative pressure.

[0023] Furthermore, the sealed chamber includes a load-bearing frame and a sealing layer covering the load-bearing frame.

[0024] Furthermore, the sealing layer includes a transparent plexiglass layer covering the periphery of the load-bearing frame and steel plates disposed at the top and bottom of the load-bearing frame; The steel plate and the transparent plexiglass layer are respectively sealed and connected to the load-bearing frame.

[0025] It should be noted that: In this application, as Figure 5 The load-bearing frame 5 shown is a box-shaped frame made of metal rods welded together. The box-shaped frame is made of stainless steel square tubes welded together to ensure the overall strength and dimensional requirements, meet the load-bearing requirements under negative pressure environment, and ensure structural stability.

[0026] In this application, as Figure 3 and Figure 4 The sealing layer shown includes a transparent plexiglass layer 7 installed around the load-bearing frame 5 to facilitate observation of the equipment operation inside the sealed chamber, as well as a top plate 4 installed on the top of the load-bearing frame 5 and a bottom plate 11 installed at the bottom of the load-bearing frame 5. The top plate 4 and the bottom plate 11 are steel plates. The top plate 4 and the bottom plate 11 are fixed to the load-bearing frame 5 by bolts or welding. The transparent plexiglass layer 7 is connected to the load-bearing frame 5 by bolts. Sealing strips 10 are installed at the connection points of the top plate 4, the bottom plate 11, and the transparent plexiglass layer 7 with the load-bearing frame 5, thereby forming a fully enclosed box-shaped space.

[0027] Furthermore, a loading / unloading door is provided on one side of the sealed chamber; A drive assembly is provided between the loading / unloading door and the sealed chamber; The drive assembly is connected to the sealed chamber and the loading / unloading door 2 respectively, and the drive assembly is used to realize the opening of the loading / unloading door 2. Adjustment of the opening and closing diameter.

[0028] It should be noted that in one embodiment of this application, the loading / unloading door 2 is located on the front side of the sealed chamber, meaning the front side of the sealed chamber has an opening, and the loading / unloading door 2 is located at the opening. The loading / unloading door 2 is connected to the sealed chamber via a drive assembly to achieve opening and closing and opening adjustment. This is used for installing or maintaining radionuclide production equipment.

[0029] Furthermore, the drive component includes a controller and a flipping component; The flipping assembly includes a drive rod 14 and a flipping rod assembly; Two sets of the flip-up lever assembly are provided on both sides of the pick-up and put-down door 2; Each of the flipping lever assemblies comprises two curved levers with opposite openings arranged at intervals and a driving lever 13; The driving levers 13 are respectively located on two opposite sides of the access door 2, and one end of each driving lever 13 is respectively connected to the outer side of the sealed chamber on the two opposite sides of the access door 2; One end of each of the two curved levers is respectively and rotatably connected to the inner side of the access door 2, and the other end of each of the two curved levers is respectively and rotatably connected to the other end of the driving lever 13; The driving rod 14 is perpendicular to the access door 2 and located on one of the two opposite sides of the access door 2, the driving rod has one end mounted on the side wall of the sealed chamber, the other end of the driving rod 14 is rotatably connected to the driving lever 13, the other end of the driving rod 14 connected to the driving lever 13 is a telescopic end, and pushes the driving lever 13 to move horizontally through telescoping, so as to drive the two curved levers to rotate, thereby realizing the opening, closing and adjustment of the opening caliber of the access door 2; The controller is wirelessly connected to the controller of the driving rod 14.

[0030] It should be noted that: In this application, as attached Figure 3 the flipping assembly shown comprises: two driving levers 13: the two driving levers 13 are symmetrically arranged on both sides of the access door 2, and one end of each of the two driving levers 13 is rotatably connected to the outer side of the sealed chamber (i.e., the left and right sides of the sealed chamber) through a mounting seat 15. Specifically, the mounting seat 15 is mounted on the left and right sides of the sealed chamber by, but not limited to, bolts / screws, one end of each of the two driving levers 13 is rotatably connected to the mounting seat 15 through a rotating shaft, and the other end of each of the two driving levers 13 is respectively and rotatably connected to two curved levers through a rotating shaft.

[0031] Each group of curved levers respectively includes a first curved lever 8 and a second curved lever 12 with opposite openings, one end of each of the first curved lever 8 and the second curved lever 12 is rotatably connected to the inner side of the access door 2 through a rotating shaft, and the other end is rotatably connected to the end of the driving lever 13 facing away from the mounting seat 16.

[0032] The driving rod 14 adopts an electric telescopic rod (which can be replaced by a hydraulic rod), is vertically mounted on the side wall of the sealed chamber (i.e., any one of the left and right sides of the sealed chamber), and the telescopic end of the driving rod 14 is rotatably connected with the middle part of the driving lever 13 through a rotating shaft; the driving rod 14 is in wireless communication connection with the controller, wherein in one embodiment of this application, the controller is a remote controller matched with the driving rod 14, the specific specification / model is: mstp-02, the telescoping of the driving rod 14 is wirelessly controlled by the remote controller to push the driving lever 13 to move horizontally (move along the front and rear sides of the sealed chamber), drive the curved lever group to rotate, and realize the opening and closing of the access door 2 and the adjustment of the opening size (as Figure 2 shown in the middle open state). The adjustment of the opening caliber of the access door 2 is adjusted by the telescopic distance of the driving rod 14.

[0033] Meanwhile, in one embodiment of this application, a handle 6 is provided on the outside of the pick-up and put-down door 2. The handle 6 is installed on the outside of the pick-up and put-down door 2 to facilitate the robot arm placed outside the sealed door to pull up and close. The robot arm is a robot arm that is used in the production process. The specific specification / model is: mstp-03.

[0034] In one embodiment of this application, the nuclear radiation shielding room 16 is a primary containment structure, constructed using radiation shielding materials such as lead plates or concrete, and enclosed in the outer perimeter of the sealed room to shield the radiation generated during the nuclide production process and protect the safety of the staff.

[0035] Before production, the drive rod is extended remotely via the controller, thereby pushing the drive assembly to open the pick-and-place door 2, placing the radionuclide production equipment in the sealed chamber, and then closing the pick-and-place door 2.

[0036] During production, ensure the positive pressure nitrogen source is activated. Nitrogen enters the sealed chamber through carrier gas inlet 9, propelling air and aerosols towards the exhaust outlet. The negative pressure exhaust system draws gas from the sealed chamber through the gas collection hood 3, creating a directional airflow that transports the aerosols through pipelines to subsequent treatment systems (such as filtration devices), ensuring effective aerosol collection.

[0037] During maintenance operations, the drive lever 14 is adjusted via the controller to open the loading / unloading door 2 as needed for equipment repair or component replacement. During operation, a negative pressure environment is maintained in the sealed chamber to prevent radioactive gas leakage.

[0038] Among them, the nuclear radiation shielding room 16 serves as the primary containment, and the sealed room serves as the secondary containment, confining radioactive waste gas to a small area within the sealed room, reducing the emission range and lowering the risk of leakage; a circulating airflow is formed by positive pressure nitrogen and negative pressure ventilation to ensure that aerosols are collected in a specific direction and properly treated, solving the volatilization and leakage problems caused by direct installation of equipment in traditional hot chambers; the transparent plexiglass layer 7 facilitates observation, and the drive component realizes the automated control of the pick-up and put-down door 2, taking into account both sealing performance and ease of maintenance.

Claims

1. A radioactive waste gas treatment device, characterized in that, The processing device includes an internally and externally sealed chamber and a nuclear radiation shielding chamber. The sealed chamber provides a closed production environment for the radionuclide production equipment. The sealed chamber is equipped with a carrier gas inlet and an exhaust gas outlet. The carrier gas inlet and the exhaust gas outlet are respectively connected to the outside of the nuclear radiation shielding room through pipes that are sealed to them, so as to maintain the gas circulation inside the sealed chamber and directionally discharge the aerosol inside the sealed chamber.

2. The radioactive waste gas treatment device according to claim 1, characterized in that, One end of the pipe connected to the carrier gas inlet is connected to the carrier gas inlet, and the other end is connected to positive pressure nitrogen. One end of the pipe connected to the exhaust outlet is connected to the exhaust outlet, and the other end is connected to a negative pressure exhaust device.

3. The radioactive waste gas treatment device according to claim 1, characterized in that, A gas collection hood is installed at the exhaust outlet; The gas collection hood is installed outside the sealed exterior.

4. The radioactive waste gas treatment device according to claim 1, characterized in that, The sealed chamber meets the load-bearing requirements for negative pressure.

5. The radioactive waste gas treatment device according to claim 1, characterized in that, The sealed chamber includes a load-bearing frame and a sealing layer covering the load-bearing frame.

6. The radioactive waste gas treatment device according to claim 5, characterized in that, The sealing layer includes a transparent organic glass layer covering the periphery of the load-bearing frame and steel plates set at the top and bottom of the load-bearing frame; The steel plate and the transparent plexiglass layer are respectively sealed and connected to the load-bearing frame.

7. The radioactive waste gas treatment device according to claim 1, characterized in that, A loading / unloading door is provided on one side of the sealed chamber; A drive assembly is provided between the loading / unloading door and the sealed chamber; The drive assembly is connected to the sealed chamber and the loading / unloading door respectively, and the drive assembly realizes the opening and closing of the loading / unloading door. And the adjustment of the opening diameter.

8. The radioactive waste gas treatment device according to claim 7, characterized in that, The drive component includes a controller and a flip component; The flipping assembly includes a drive rod and a flipping rod assembly; Two sets of the flip-rod assembly are provided on both sides of the loading and unloading door; The flipping rod assembly includes two curved rods with openings facing each other and spaced apart, as well as an active rod; The active rods are located on opposite sides of the pick-up and put-down doors, and one end of each active rod is connected to the outside of the sealed chamber on opposite sides of the pick-up and put-down doors. One end of each of the two curved rods is rotatably connected to the inside of the take-up and put-down door, and the other end of each of the two curved rods is rotatably connected to the other end of the drive rod. The drive rod is perpendicular to the loading and unloading door and is located on one of the opposite sides of the loading and unloading door. One end of the drive rod is mounted on... Installed on the side wall of the sealed chamber, the other end of the drive rod is rotatably connected to the active rod. The other end of the drive rod connected to the active rod is a telescopic end, and the active rod is pushed to move horizontally by telescopic movement, thereby driving the two curved rods to rotate, so as to realize the opening and closing of the door and the adjustment of the opening diameter. The controller is wirelessly connected to the controller of the drive rod.

9. A radioactive waste gas treatment device according to claim 8, characterized in that, The drive rod can be either a hydraulic rod or an electric telescopic rod.

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