Automatic radioactive waste gas treatment system

Abstract

The radioactive waste gas automatic treatment system comprises a box body, an air inlet pipe and an air outlet pipe are fixedly arranged on the box body, a filtering device and a decay box body are fixedly arranged in the box body, the filtering device comprises a filtering box body and at least one filtering element, and the filtering box body comprises an inner shell, an anti-radiation layer and an outer shell. An anti-radiation layer is clamped between the inner shell and the outer shell, a filtering protection cavity is defined by the inner shell and the outer shell, at least one filtering element is detachably inserted into the filtering protection cavity, and the air inlet and the air outlet are fixedly connected with the air inlet pipe and the air outlet pipe respectively; the decay box body comprises an inner shell, an anti-radiation layer and an outer shell, the anti-radiation layer is clamped between the inner shell and the outer shell, a decay protection cavity is defined by the inner shell and the outer shell, and at least one filter element is detachably inserted into the decay protection cavity through the opening and used for storing the used filter element. The device can be mounted at the outlet of each exhaust system indoors or outdoors, radionuclides in radioactive waste gas can be adsorbed and filtered, and the standard gas can be discharged into the atmosphere.

Description

Technical Field

[0001] This utility model relates to the field of polluted gas treatment technology, and in particular to an automated treatment system for radioactive waste gas. Background Technology

[0002] Nuclear medicine is a new technology that uses nuclear technology to diagnose, treat, and research various diseases. Radioactive waste generated in hospitals mostly comes from waste gases produced in high-activity areas such as drug dispensing rooms, injection rooms, wards, and research institutions in nuclear medicine departments. Although existing technologies take certain radiation protection measures in the ventilation ducts of these areas, a small amount of radioactive material in the waste gas discharged from the ventilation ducts cannot be effectively blocked or weakened. The radioactive material will still leak into the outside world through scattering, causing environmental pollution and resulting in low safety. Utility Model Content

[0003] The purpose of this invention is to address the above-mentioned problems by providing an automated radioactive waste gas treatment system. This system can be installed at the outlet of various indoor or outdoor exhaust systems to adsorb and filter radionuclides in radioactive waste gas, and discharge the qualified gas into the atmosphere.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] An automated radioactive waste gas treatment system includes a housing, on which an inlet pipe and an outlet pipe are fixedly installed. A filter device and a decay chamber are fixedly installed inside the housing.

[0006] The filtration device includes a filter housing and at least one filter element. The filter housing includes an inner shell, a radiation shielding layer, and an outer shell. The radiation shielding layer is sandwiched between the inner shell and the outer shell, forming a filtration and protection cavity. The filter housing has an opening, an air inlet, and an air outlet, all of which are connected to the filtration and protection cavity. The at least one filter element is detachably inserted into the filtration and protection cavity through the opening. The air inlet and the air outlet are fixedly connected to an air inlet pipe and an air outlet pipe, respectively. In operation, the gas entering from the air inlet pipe is filtered by the filter element and then discharged from the air outlet pipe.

[0007] The decay box includes an inner shell, a radiation shielding layer, and an outer shell. The radiation shielding layer is sandwiched between the inner shell and the outer shell, forming a decay protection cavity. The decay box has an opening that communicates with the protection cavity. At least one filter element is detachably inserted into the decay protection cavity through the opening. The decay box is used to store the used filter element.

[0008] Furthermore, two baffles are fixedly installed in the filter protection cavity. The two baffles are respectively arranged close to the air inlet and air outlet of the filter box, and are a certain distance away from the air outlet to form a ventilated gap. The baffles are used to prevent radiation from being emitted from the air outlet.

[0009] Furthermore, the filter element includes a pull frame and a filter chip, the filter chip being laid inside the pull frame and detachably inserted into the protective cavity of the filter housing via the pull frame, the filter chip being used to filter radioactive substances in the gas.

[0010] Furthermore, it also includes a spare housing, which is fixedly installed inside the box and is used to store unused filter elements.

[0011] Furthermore, it also includes a fan, which is fixedly installed inside the housing. The input and output ends of the fan are fixedly connected to the air outlet and air outlet pipe of the filter device, respectively, to increase the gas delivery pressure and facilitate smooth discharge.

[0012] Furthermore, it also includes a damper, one end of which is fixedly connected to the air inlet pipe, and the other end of which is used to connect to an external exhaust pipe to control the entry of gas.

[0013] Furthermore, an electrical control box is fixedly installed inside the box. The electrical control box includes a power module, a human-machine interface module, and a PLC. The power module is used to provide operating power. The human-machine interface module, the fan, and the air valve are respectively connected to the PLC. The human-machine interface module is used to display the operating status of the fan and the air valve in real time. The PLC is used to control the start and stop of the fan and the opening or closing of the air valve.

[0014] Furthermore, it also includes an airflow sensor, which is fixedly installed at the input end of the fan and connected to the PLC. It is used to monitor the airflow rate and display the airflow rate values ​​on the human-machine interface module.

[0015] Furthermore, the front panel of the enclosure has operating ports corresponding to the positions of the filter device, decay box, spare box and electrical control box, and the corresponding operating ports are respectively connected to the filter device door, decay device door, spare device door and electrical control device door.

[0016] Furthermore, the filter chip is made of activated carbon filter or air filter cotton.

[0017] By adopting the above technical solution, this utility model has the following beneficial effects:

[0018] 1. This utility model is mainly installed at the outlet of each exhaust system, and can generally be placed on the top of the building where the department is located. It purifies indoor radioactive waste gas through the filtration device and protects environmental safety. The filter element is stored in the decay box. After the activity of the radioactive substances adsorbed by the filter element is reduced, it is then subjected to harmless treatment, which can greatly reduce the probability of pollution and the difficulty of treatment, and further reduce the treatment cost of waste filter screens.

[0019] 2. This utility model allows for real-time monitoring of system operation through the electrical control box, and, in conjunction with the air volume sensor, real-time monitoring of air speed and flow rate, enabling human-machine interface control, making operation simpler and more convenient. Attached Figure Description

[0020] Figure 1 This is a three-dimensional schematic diagram of the present invention.

[0021] Figure 2 This is a three-dimensional schematic diagram of the present invention from another perspective.

[0022] Figure 3 This is a utility model Figure 1 The front view.

[0023] Figure 4 This is a utility model Figure 1 The right view.

[0024] Figure 5 This is a utility model Figure 3 Sectional view at CC.

[0025] Figure 6 This is a utility model Figure 4 Sectional view at DD.

[0026] Figure 7 This is a schematic diagram of the internal state of this utility model.

[0027] Figure 8 This is a schematic diagram of the internal unfolded state of this utility model.

[0028] Figure 9 This is a utility model Figure 8 Enlarged view of point A.

[0029] Figure 10 This is a utility model Figure 6 Enlarged view of point B.

[0030] In the attached diagram, the components are: main housing 1, filter device door 11, decay device door 12, standby device door 13, electrical control device door 14, air inlet pipe 2, air outlet pipe 3, filter device 4, filter housing 41, filter element 42, pull frame 421, filter chip 422, magnet 43, baffle 44, fan 5, air valve 6, decay box 7, standby device 8, control device 9, and air volume sensor 10. Detailed Implementation

[0031] Example 1

[0032] like Figures 1-10 As shown, the automated radioactive waste gas treatment system of this embodiment 1 includes a housing 1, an inlet pipe 2, and an outlet pipe 3. The inlet pipe 2 is horizontally arranged on the right side of the housing 1 and is used to connect to an external exhaust pipe. The outlet pipe 3 is vertically arranged on the upper side of the housing 1. Preferably, a rain cap can be installed on the top of the outlet pipe 3 to prevent rainwater from entering the housing 1 from the outlet pipe 3. A filter device 4, a decay box 7, and a spare box 8 are fixedly installed inside the housing 1. Wherein:

[0033] The filtration device 4 includes a filter housing 41 and at least one filter element 42. The filter housing 41 is fixedly installed inside the housing 1. The filter housing 41 includes an inner shell, a radiation shielding layer, and an outer shell. The radiation shielding layer is sandwiched between the inner shell and the outer shell, forming a radiation shielding cavity. Specifically, the radiation shielding layer is made of lead plate. Through the radiation shielding cavity formed by the lead plate sandwiched between the inner and outer shells, harmful radiation substances such as aerosols and volatiles filtered by the filter element can effectively prevent radiation hazards to the surrounding environment. The filter housing 41 has openings for protection. The filter housing 41 has an opening that connects to the cavity. At least one filter element 42 is detachably inserted into the protective cavity of the filter housing 41 through the opening. The filter housing 41 and the filter element 42 are combined in a pull-out structure. The filter housing 41 also has an air inlet and an air outlet that communicate with the protective cavity. The air inlet and air outlet of the filter housing 41 are fixedly connected to the air inlet pipe 2 and the air outlet pipe 3, respectively. The filter element 42 is arranged perpendicular to the axis of the air inlet pipe 2. In the working state, the gas entering from the air inlet pipe 2 is filtered by the filter element 42 and then discharged from the air outlet pipe 3.

[0034] In a preferred embodiment, two square-plate-shaped baffles 44 are fixedly installed in the filter protection cavity. The two baffles 44 are respectively arranged close to the air inlet and air outlet of the filter box 41, and are each a certain distance away from the air outlet to form a ventilated gap. Specifically, a convex structure can also be provided on the right side of the box. The air inlet pipe 2 is connected to the filter box 41 through the convex structure. Then, the baffle 44 arranged at the air outlet of the filter box 41 can be installed at the air inlet of the convex structure. For the specific installation positions of the convex structure and the baffle 44, please refer to [reference needed]. Figure 10 The bulge and baffle 44 are made of lead plate to prevent radiation from being emitted from the air vent after radioactive material enters the filter box 41.

[0035] In a preferred embodiment, the filter device 4 includes three filter elements 42. Each filter element 42 includes a pull frame 421 and a filter chip 422. The filter chip 422 is laid inside the pull frame 421 and is fixedly connected to the pull frame 421 around its perimeter. The pull frame 421 includes a quadrilateral frame and a handle on the outside of the frame. The inner shell of the filter box 41 is provided with a U-shaped guide groove that matches the insertion of the pull frame 421, facilitating the insertion and removal of the filter element 42 and limiting the installation of the filter element 42. Specifically, a magnet assembly 43 can also be added. The magnet assembly 43 includes a positive magnet and a negative magnet, which are respectively disposed on the filter box 41 and the pull frame 421. The specific structure and installation position of the positive magnet are as follows. Figure 8 and Figure 9 As shown (the negative magnet is not shown), by adding a magnetic attraction structure, when the filter element 42 is fully inserted into the filter box 41, the pull frame 421 is attracted to the filter box 41 to prevent the filter element 42 from falling out.

[0036] In a preferred embodiment, the filter chip 422 is made of activated carbon filter or air filter cotton, such as Figure 10 As shown in this embodiment 1, the three filter chips 422a, 422b and 422c in the direction from the air inlet to the air outlet of the filter box 41 are selected as air filter cotton, activated carbon filter and activated carbon filter respectively.

[0037] The decay chamber 7 includes an inner shell, a radiation-shielding layer, and an outer shell. The radiation-shielding layer is made of lead plate. The radiation-shielding layer is sandwiched between the inner shell and the outer shell, forming a decay protection cavity. The decay chamber 7 has an opening that communicates with the decay protection cavity. The filter element 42 is detachably inserted into the decay protection cavity through the opening. The decay chamber 7 is used to store the used filter element 42 to await the decay of radioactive materials. The spare chamber 8 has the same structure as the decay chamber 7, or the spare chamber 8 may not have a lead plate to save manufacturing costs. The spare chamber 8 is used to store unused filter elements 42. It should be noted that both the decay chamber 7 and the spare chamber 8 are equipped with U-shaped guide grooves and positive magnets to facilitate the pulling out of the filter element 42 and prevent it from falling out during storage.

[0038] In a preferred embodiment, the waste gas treatment system further includes a fan 5 and a damper 6. The fan 5 is fixedly installed inside the housing 1. The input and output ends of the fan 5 are fixedly connected to the air outlet of the filter device 4 and the air outlet pipe 3 respectively through pipes. By adding the fan 5, the gas delivery pressure can be increased and the gas can be discharged smoothly. A damper 6 is also provided at the front end of the air inlet pipe 2. The two ends of the damper 6 are fixedly connected to the air inlet pipe 2 and the external exhaust pipe respectively, and are used to control the gas entry. It should be noted that the fan 5 and the damper 6 are existing technologies. The damper 6 includes a manual damper and an electric damper. In this embodiment, the damper 6 is described using a manual damper as an example.

[0039] The method of using the exhaust gas treatment system in this embodiment 1 is as follows: During installation, connect the manual air valve to the indoor exhaust pipe. Connect the fan 5 to an external mains power supply. When starting, first open the manual air valve and start the fan 5. The indoor exhaust gas enters the filter device 4 from the inlet pipe 2 under the action of the fan 5. After filtration, the exhaust gas is discharged from the outlet pipe 3. After a certain period, the filter element 42 needs to be replaced periodically when it reaches the effective service life. Before replacement, first stop the fan 5, close the manual air valve, and remove the filter element 42 from the filter box 41. At this time, the filter element 42 may absorb... If the filter element 42, which contains active radioactive material, is discarded without proper treatment, it will harm the surrounding environment and human health. Therefore, the removed filter element 42 needs to be placed in the decay device 7 for decay. After the decay period, the activity will be reduced and then the filter element will be rendered harmless. This greatly reduces the probability of pollution and the difficulty of treatment, and further reduces the treatment cost of the waste filter. At the same time, a new unused filter element 42 is taken out from the spare box 8 and inserted into the filter box 41. The spare box is also replenished with a new filter element 42 for use in the next cycle. After the replacement is completed, the system is turned off and then started.

[0040] Example 2

[0041] Based on the aforementioned Embodiment 1, the automated radioactive waste gas treatment system of Embodiment 2 further includes an electrical control box 9 and an air volume sensor 10. The air valve 6 is an electric air valve as an example for illustration, and other similar structures will not be described in detail.

[0042] An airflow sensor 10 is fixedly installed at the input end of the fan 5. It is used to monitor the air velocity and flow rate in the duct. An electrical control box 9 is fixedly installed inside the housing 1. The electrical control box 9 includes a power module, a human-machine interface (HMI) module, and a PLC. The power module is connected to the mains power and provides operating power to the system. The HMI module, fan 5, air valve 6, and airflow sensor 10 are connected to the PLC. The HMI module displays the real-time operating status of the fan 5 and air valve 6, as well as the air velocity and flow rate values ​​monitored by the airflow sensor 10. The PLC controls the start and stop of the fan 5 and the opening / closing of the air valve 6. Specifically, the fan and air valve 6 can be controlled by installing a mechanical switch inside the electrical control box 9 and connecting it to the PLC, or by using the touch switch on the HMI module. It should be noted that the electrical control box is existing equipment, and the PLC and other components inside are also existing equipment. Connection and control can be completed using standard power and data cables according to the manufacturer's instructions. For example, the HMI module can be a touch screen. The PLC and other components, as well as their connection and control, are existing technologies and will not be elaborated upon here.

[0043] In this embodiment 2, the exhaust gas treatment system is controlled by the electrical control box 9 to open or close the air valve 6, fan 5, etc., and then perform the corresponding operations. The system operation status can be monitored in real time, and human-machine interface control can be realized, making the operation simpler and more convenient.

[0044] Based on the above embodiment 1 or embodiment 2, as a preferred embodiment, the front of the housing 1 is provided with operation ports corresponding to the positions of the filter device 4, decay box 7, spare box 8 and electrical control box 9. The corresponding operation ports are respectively connected to the filter device door 11, decay device door 12, spare device door 13 and electrical control device door 14. When needed, the corresponding device door can be opened to perform relevant operations, thereby improving the practicality of the system.

[0045] It should be noted that the examples of the above embodiments can preferably be combined with one or more of each other according to actual needs, and the accompanying drawings of multiple examples adopt a set of combined technical features, which will not be described in detail here.

[0046] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0047] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0048] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An automated radioactive waste gas treatment system, comprising a housing (1), wherein an inlet pipe (2) and an outlet pipe (3) are fixedly installed on the housing (1), characterized in that: The housing (1) is equipped with a filter device (4) and a decay box (7), wherein: The filter device (4) includes a filter box (41) and at least one filter element (42). The filter box (41) includes an inner shell, a radiation shielding layer and an outer shell. The radiation shielding layer is sandwiched between the inner shell and the outer shell and forms a filter protection cavity. The filter box (41) has an opening, an air inlet and an air outlet. The opening, air inlet and air outlet are all connected to the filter protection cavity. The at least one filter element (42) is detachably inserted into the filter protection cavity through the opening. The air inlet and air outlet are fixedly connected to the air inlet pipe (2) and the air outlet pipe (3) respectively. In the working state, the gas entering from the air inlet pipe (2) is filtered by the filter element (42) and then discharged from the air outlet pipe (3). The decay box (7) includes an inner shell, a radiation shielding layer and an outer shell. The radiation shielding layer is sandwiched between the inner shell and the outer shell and forms a decay protection cavity. The decay box (7) has an opening that communicates with the protection cavity. At least one filter element (42) is detachably inserted into the decay protection cavity through the opening. The decay box (7) is used to store the filter element (42) after use.

2. The automated radioactive waste gas treatment system according to claim 1, characterized in that: Two baffles (44) are fixedly installed in the filter protection cavity. The two baffles (44) are arranged close to the air inlet and air outlet of the filter box (41) respectively, and are a certain distance away from the air outlet to form a ventilable gap. The baffles (44) are used to prevent radiation from being emitted from the air outlet.

3. The automated radioactive waste gas treatment system according to claim 1, characterized in that: The filter element (42) includes a pull frame (421) and a filter chip (422). The filter chip (422) is laid inside the pull frame (421). The filter chip (422) is detachably inserted into the protective cavity of the filter box (41) through the pull frame (421). The filter chip (422) is used to filter radioactive substances in the gas.

4. The automated radioactive waste gas treatment system according to claim 1, characterized in that: It also includes a spare housing (8), which is fixedly installed inside the housing (1) and is used to store unused filter elements (42).

5. The automated radioactive waste gas treatment system according to claim 1, characterized in that: It also includes a fan (5), which is fixedly installed inside the housing (1). The input end and output end of the fan (5) are fixedly connected to the air outlet and air outlet pipe (3) of the filter device (4), respectively.

6. The automated radioactive waste gas treatment system according to claim 5, characterized in that: It also includes a damper (6), one end of which is fixedly connected to the air inlet pipe (2), and the other end of which is used to connect to an external exhaust pipe.

7. The automated radioactive waste gas treatment system according to claim 6, characterized in that: An electrical control box (9) is fixedly installed inside the housing (1). The electrical control box (9) includes a power supply module, a human-machine interface module and a PLC. The power supply module is used to provide operating power. The human-machine interface module, the fan (5) and the air valve (6) are respectively connected to the PLC. The human-machine interface module is used to display the operating status of the fan (5) and the air valve (6) in real time. The PLC is used to control the start and stop of the fan (5) and the opening or closing of the air valve (6).

8. The automated radioactive waste gas treatment system according to claim 7, characterized in that: It also includes an air volume sensor (10), which is fixedly installed at the input end of the fan (5) and connected to the PLC. It is used to monitor the air velocity and flow rate and display the air velocity and flow rate values ​​on the human-machine interface module.

9. The automated radioactive waste gas treatment system according to claim 8, characterized in that: The front panel of the housing (1) is provided with operation ports corresponding to the positions of the filter device (4), decay box (7), spare box (8) and electrical control box (9), and the corresponding operation ports are respectively connected to the filter device door (11), decay device door (12), spare device door (13) and electrical control device door (14).

10. The automated radioactive waste gas treatment system according to claim 3, characterized in that: The filter chip (422) is made of activated carbon filter or air filter cotton.

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