Transfer device for radioactive waste gas adsorption bed

Abstract

The invention belongs to the technical field of nuclear power, and particularly relates to a radioactive waste gas adsorption bed transfer device. According to the invention, the box body is provided with a gas replacement system, a differential pressure gauge and radioactive gas monitoring equipment; the differential pressure gauge is used for collecting differential pressure data of air pressure in the box body and external air pressure, and the radioactive gas monitoring equipment is used for collecting radioactive substance concentration data in the box body; the gas replacement system is used for keeping the air pressure in the box body negative pressure; the gas replacement system is also used for purifying gas in the inner space of the box body; the control system is connected with the radioactive gas monitoring equipment and the gas replacement system, and the control system can obtain radioactive substance concentration data from the radioactive gas monitoring equipment and control the gas replacement system to work. The device can ensure that the adsorption bed is simple and convenient to operate, safe and reliable in the transfer process, prevents airborne radioactivity from leaking, reduces the exposure dose of personnel in the transfer process, and realizes convenience, safety and environmental friendliness of the whole transfer process.

Description

Technical Field

[0001] The invention belongs to the technical field of radiation protection, and in particular relates to a radioactive waste gas adsorption bed transport device. Background Art

[0002] Nuclear facilities usually use adsorption beds filled with porous adsorption materials to treat radionuclides in process waste gas to avoid radioactive emissions. To ensure that the waste gas adsorption bed can achieve continuous and efficient purification, the adsorption bed needs to be replaced regularly, and then the old adsorption bed is regenerated after the adsorbent is reinstalled and used again. Usually, the old adsorption bed after replacement is filled with adsorption materials that adsorb radioactive waste gas. In order to avoid radiation effects on personnel and the environment during transportation, the transfer device should have the performance of avoiding internal radioactive contamination of personnel and reducing external radioactive exposure, while taking into account the convenience of operation and the safety of the transportation process. Summary of the invention

[0003] In order to overcome the problems existing in the related technology, a radioactive waste gas adsorption bed transfer device is provided.

[0004] According to one aspect of an embodiment of the present disclosure, there is provided a radioactive waste gas adsorption bed transport device, the device comprising: a control system, a radioactive gas monitoring device, a box, and a gas replacement system;

[0005] The box is equipped with a gas replacement system, a differential pressure gauge and a radioactive gas monitoring device; the differential pressure gauge is used to collect the pressure difference data between the air pressure inside the box and the external air pressure, and the radioactive gas monitoring device is used to collect the radioactive material concentration data inside the box;

[0006] The gas replacement system is used to maintain negative pressure inside the box; the gas replacement system is also used to purify the gas in the internal space of the box; the control system is connected to the radioactive gas monitoring equipment and the gas replacement system respectively, and the control system can obtain radioactive material concentration data from the radioactive gas monitoring equipment and control the operation of the gas replacement system.

[0007] In a possible implementation, the gas replacement system is provided with a variable frequency fan, a radioactive aerosol purification unit and a radioactive gas purification unit;

[0008] The air inlet end of the gas replacement system is connected to the exhaust port of the box, and the air outlet end of the gas replacement system is connected to the air supply port of the box. The air outlet end of the gas replacement system adopts a three-way design, and the main air flow is used for air supply inside the box; the radioactive aerosol purification unit is equipped with a nuclear-grade air filter; the radioactive gas purification unit adopts an adsorption bed equipped with porous adsorption material.

[0009] In one possible implementation, the working modes of the gas replacement system include: negative pressure maintenance mode and emergency purification mode; when the control system determines that the radioactive material concentration data meets the monitoring conditions, the control system controls the gas replacement system to be in the negative pressure maintenance mode, so that the inside of the box maintains a preset negative pressure; when the control system determines that the gas monitoring data meets the monitoring conditions, the control system controls the gas replacement system to be in the purification control mode, controls the gas replacement system to perform gas purification, and switches from the purification control mode to the negative pressure control mode until the acquired radioactive material concentration data meets the preset threshold.

[0010] In a possible implementation, a base is provided in the box for fixing the adsorption bed.

[0011] In a possible implementation, the box body is made of stainless steel, and a double-layer stainless steel plate is used around the box body, and a lead shield is installed in the gap between the double-layer stainless steel plates.

[0012] In a possible implementation, a plurality of shield fixing grooves are provided in the gap to increase or decrease the number of lead shields according to the radiation dose rate of the exhaust gas adsorption bed.

[0013] In a possible implementation, a guide rail is provided at the bottom of the box body for translating and fixing the adsorption bed base in the box body.

[0014] In a possible implementation, the box body is equipped with an automatic door, and a silicone rubber sealing ring is provided at the joint between the door and the box body.

[0015] In one possible implementation, a pulley design is adopted at the bottom of the base. The pulley can be embedded in the guide rail of the box and can roll smoothly on the ground. The pulley is designed with a locking device.

[0016] The beneficial effects of the present disclosure are: the present disclosure provides a radioactive waste gas adsorption bed transfer device, which can ensure that the adsorption bed transfer process is simple, safe and reliable to operate, prevent the leakage of airborne radioactivity, reduce the radiation dose of personnel during the transfer process, and achieve convenience, safety and environmental friendliness of the entire transfer process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of a radioactive waste gas adsorption bed transport device shown in an embodiment of the present disclosure.

[0018] In the figure:

[0019] 1. Control system; 2. Radioactive gas monitoring equipment; 3. Box; 4. Gas replacement system;

[0020] 5. Check valve; 6. Differential pressure gauge; 7. Box door. DETAILED DESCRIPTION

[0021] The present disclosure is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0022] Unless otherwise defined, the technical and scientific terms used in the present disclosure have the same meanings as those generally understood by those skilled in the art to which the present disclosure belongs; the terms used in the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure; the term "including" and any variations thereof in the present disclosure are intended to cover non-exclusive inclusions. Obviously, the embodiments described in the present disclosure are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without making creative efforts are within the scope of protection of the present disclosure.

[0023] Reference to "embodiments" in this disclosure means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the disclosure. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0024] Figure 1 is a schematic diagram of a radioactive waste gas adsorption bed transport device shown in an embodiment of the present disclosure, such as Figure 1 As shown, the device comprises: a control system 1, a radioactive gas monitoring device 2, a box 3, and a gas replacement system 4. The device is also provided with a power supply for powering the entire device.

[0025] The box 3 is provided with a gas replacement system 4, a differential pressure gauge 6 and a radioactive gas monitoring device 2; the differential pressure gauge 6 is used to collect and display the pressure difference data between the air pressure inside the box 3 and the external air pressure, and the radioactive gas monitoring device 2 is used to collect the radioactive material concentration data inside the box 3.

[0026] The gas replacement system 4 is used to keep the internal air pressure of the box 3 at a negative pressure to ensure that the airborne radioactivity in the transfer space is not discharged; the gas replacement system 4 is also used to purify the gas in the internal space of the box 3; for example, the gas replacement system 4 is provided with a variable frequency fan, a radioactive aerosol purification unit and a radioactive gas purification unit; the air inlet end of the gas replacement system 4 is connected to the exhaust port of the box 3, and the air outlet end of the gas replacement system 4 is connected to the air supply port of the box 3. The air outlet end of the gas replacement system 4 adopts a three-way design, and the main airflow is used for air supply inside the box 3. An emptying section is also provided for emptying with a small flow rate. The emptying section is designed with a check valve 5 to prevent the airflow in the box 3 from being discharged without purification; the radioactive aerosol purification unit is equipped with a nuclear-grade air filter; the radioactive gas purification unit adopts a small adsorption bed filled with porous adsorption materials such as activated carbon, silica gel, MOFS, etc.

[0027] The control system 1 is connected to the radioactive gas monitoring device 2 and the gas replacement system 4 respectively. The control system 1 can obtain radioactive material concentration data from the radioactive gas monitoring device 2 and control the gas replacement system 4 to work.

[0028] In a possible implementation, the working modes of the gas replacement system 4 include: negative pressure maintenance mode and emergency purification mode. When the control system 1 determines that the radioactive material concentration data meets the monitoring conditions, the gas replacement system 4 is controlled to be in the negative pressure maintenance mode, so that the preset negative pressure is maintained inside the box 3; when the control system 1 determines that the gas monitoring data meets the monitoring conditions, the gas replacement system 4 is controlled to be in the purification control mode, and the gas replacement system 4 is controlled to perform gas purification until the acquired radioactive material concentration data meets the preset threshold value, and the purification control mode is switched to the negative pressure control mode.

[0029] For example, the radioactive gas monitoring device 2 can continuously sample and measure the airflow inside the box 3, monitor the gamma dose rate in the box 3 environment in real time, and transmit the data to the control system 1. The control system 1 receives the gamma dose rate data of the radioactive gas monitoring device, controls the working frequency of the variable frequency fan, and is used to adjust the two working modes of the gas replacement system 4; and controls the switch state of the automatic box door 7.

[0030] In a possible implementation, a base is provided in the box body 3 to fix the adsorption bed, so as to ensure that the bed is stable and does not tip over during transportation, thereby avoiding adverse effects on operators and the environment during transportation.

[0031] In a possible implementation, the box body 3 is made of stainless steel, and the box body 3 is designed with double-layer stainless steel plates around it. Lead shielding is installed in the gap between the double-layer stainless steel plates; multiple shielding fixing grooves are set in the gap to facilitate the increase or decrease of the number of lead shielding according to the radiation dose rate of the exhaust gas adsorption bed. The lead shielding is designed as a plate with fixed thickness, length and width, and can be embedded in the shielding fixing grooves around the transfer box. The plate needs to be processed flat to ensure smooth installation and easy multi-layer stacking installation.

[0032] In one possible implementation, the inner surface of the box 3 is designed to be smooth and easy to remove contamination, so as to remove radioactive surface contamination left inside the box 3 after the transfer is completed; a guide rail is set at the bottom of the box 3 for translating and fixing the adsorption bed base in the box 3.

[0033] In a possible implementation, the box body 3 is equipped with an automatic door 7, and a silicone rubber sealing ring is provided at the joint between the door 7 and the box body 3 to ensure that the box body 3 is sealed and leak-proof; the box body 3 is designed with a differential pressure gauge 6 for displaying the pressure difference between the inside of the box body 3 and the external environment.

[0034] In one possible implementation, a pulley design is adopted at the bottom of the base, and the pulley can be embedded in the guide rail of the box 3 and can roll smoothly on the ground of the nuclear facility plant. The pulley is designed with a locking device to ensure that it can be tightly fixed to the guide rail of the box 3; the base has bolt connectors to ensure that the exhaust gas adsorption bed is fixed and does not tip over.

[0035] In one application example, the following method is used to transport radioactive waste gas adsorption beds.

[0036] Step 101, after the radioactive waste gas adsorption bed of the nuclear facility completes a working cycle, professional staff will remove the adsorption bed from the waste gas treatment system. After the adsorption bed is separated from the system, the upstream and downstream interfaces of the adsorption bed are sealed through special sealing blind plates to ensure that the radioactive gas and adsorbent do not leak out.

[0037] Step 102, place the base near the adsorption bed to be transported, fix the adsorption bed and the base with connecting bolts, the operator quickly pushes the adsorption bed into the box, and embeds the pulley of the base into the guide rail of the box. After the adsorption bed is transported to the specified position inside the box, the bottom pulley is locked to ensure that the adsorption bed is stable and does not tip over during transportation, and the control system is operated to close the automatic box door.

[0038] Step 103, the control system turns on the radioactive gas monitoring equipment, and after the equipment is preheated and the reading is stable, the gas replacement system is turned on. The system starts the negative pressure holding mode by default, and the personnel read the reading of the box pressure differential gauge to confirm that the box is in a negative pressure state relative to the external environment to ensure that the airflow inside the box does not leak.

[0039] Step 104, during the transportation process, if the concentration of airborne radioactivity in the box is abnormal, the radioactive gas monitoring equipment will feed back the data to the control system, and the control system will automatically adjust the gas replacement system to the emergency purification mode, increase the air volume of the variable frequency fan, increase the negative pressure of the box, and speed up the ventilation rate inside the box, so as to ensure that the concentration of airborne radioactivity in the box is quickly reduced to a normal level.

[0040] Step 105, after the airborne radioactivity concentration in the box returns to normal, the control system automatically adjusts the gas replacement system to the negative pressure holding mode according to the feedback data of the radioactive gas monitoring equipment;

[0041] Step 106, after the adsorption bed is transported to the target location, if the radioactive gas monitoring equipment shows normal readings, confirming that the gas replacement system is normally in the negative pressure holding mode, the gas replacement system is shut down, the automatic box door is opened, and the operator removes the adsorption bed from the box and transports it to the designated location.

[0042] Step 107, after the adsorption bed is transported to the target location, if the radioactive gas monitoring equipment shows abnormal readings and the airborne radioactivity concentration is higher than the normal value, it is confirmed that the gas replacement system is in emergency purification mode. After the airborne radioactivity concentration in the box is reduced to a normal level and the gas replacement system is switched to a negative pressure holding mode, the gas replacement system is shut down, the box door is opened, and the operator removes the adsorption bed from the box and transports it to the designated location.

[0043] Step 108, after the transfer is completed, the radiation protection personnel conduct a surface contamination survey on the inside of the box, and after ensuring that the inner surface is not contaminated, close the automatic box door and disconnect the power supply of the equipment, and the entire transfer process is completed.

[0044] The embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A radioactive waste gas adsorption bed transport device, characterized in that: The device comprises: a control system, a radioactive gas monitoring device, a box, and a gas replacement system; The box is equipped with a gas replacement system, a differential pressure gauge and a radioactive gas monitoring device; the differential pressure gauge is used to collect the pressure difference data between the air pressure inside the box and the external air pressure, and the radioactive gas monitoring device is used to collect the radioactive material concentration data inside the box; The gas replacement system is used to maintain negative pressure inside the box; the gas replacement system is also used to purify the gas in the internal space of the box; the control system is connected to the radioactive gas monitoring equipment and the gas replacement system respectively, and the control system can obtain radioactive material concentration data from the radioactive gas monitoring equipment and control the operation of the gas replacement system.

2. The device according to claim 1, characterized in that The gas replacement system is equipped with a variable frequency fan, a radioactive aerosol purification unit and a radioactive gas purification unit; The air inlet end of the gas replacement system is connected to the exhaust port of the box, and the air outlet end of the gas replacement system is connected to the air supply port of the box. The air outlet end of the gas replacement system adopts a three-way design, and the main air flow is used for air supply inside the box; the radioactive aerosol purification unit is equipped with a nuclear-grade air filter; the radioactive gas purification unit adopts an adsorption bed equipped with porous adsorption material.

3. The device according to claim 1, characterized in that The working modes of the gas replacement system include: negative pressure maintenance mode and emergency purification mode; when the control system determines that the radioactive material concentration data meets the monitoring conditions, the control system controls the gas replacement system to be in negative pressure maintenance mode, so that the preset negative pressure inside the box is maintained; when the control system determines that the gas monitoring data meets the monitoring conditions, the control system controls the gas replacement system to be in purification control mode, and controls the gas replacement system to perform gas purification until the acquired radioactive material concentration data meets the preset threshold, and switches from purification control mode to negative pressure control mode.

4. The device according to claim 1, characterized in that A base is arranged in the box body for fixing the adsorption bed.

5. The device according to claim 1, characterized in that The box body is made of stainless steel, and the box body is designed with double-layer stainless steel plates around it, and lead shielding is installed in the gap between the double-layer stainless steel plates.

6. The device according to claim 5, characterized in that A plurality of shield fixing grooves are arranged in the gap to increase or decrease the number of lead shields according to the radiation dose rate of the exhaust gas adsorption bed.

7. The device according to claim 1, characterized in that A guide rail is arranged at the bottom of the box body for translating and fixing the adsorption bed base in the box body.

8. The device according to claim 1, characterized in that The box body is equipped with an automatic door, and a silicone rubber sealing ring is set at the joint between the door and the box body.

9. The device according to claim 1, characterized in that The bottom of the base adopts a pulley design, which can be embedded in the guide rail of the box and can roll smoothly on the ground. The pulley is designed with a locking device.

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