Discharge structure for treating radioactive aerosol

Abstract

The utility model discloses a discharge structure for processing radioactive aerosol, which comprises an exhaust pipeline extending upwards, a bend part bending downwards is arranged at the upper end of the exhaust pipeline, a downward discharge port is arranged on the bend part, a spraying device for spraying weakly alkaline water mist is arranged in the bend part, and the discharge port is communicated with the discharge port. And a drying device for adsorbing water mist and radioactive substances is arranged below the spraying device. The device has the advantage of high treatment efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of emission treatment devices for radioactive pollutants, in particular to an emission structure for treating radioactive aerosols. Background Art

[0002] In the radiopharmaceutical production industry, the production of radiopharmaceuticals is a high-tech, high-value-added process, but it is also accompanied by potential environmental pollution problems. In particular, during the production process, due to the use of radioactive substances, radioactive gases will inevitably be produced. If these gases are directly discharged into the environment without treatment, they will cause serious harm to the health of workers and the surrounding environment.

[0003] Traditionally, the main method for treating radioactive gases in the industry is to use activated carbon adsorption technology. Activated carbon is often used in industry for gas purification, including filtering harmful gases and controlling odors, due to its porous structure and large specific surface area. Through adsorption, activated carbon can capture and fix radioactive elements, thereby reducing the radioactivity level of the exhaust gas.

[0004] However, this method has many limitations when dealing with radioactive gases. First, the adsorption efficiency of activated carbon does not always meet the high standards of environmental protection. Some gases produced during the production of radioactive drugs may not be easily adsorbed by activated carbon due to their characteristics, or the adsorption efficiency of activated carbon decreases significantly after adsorption saturation. In addition, the regeneration and treatment of activated carbon is also a problem, because once radioactive substances are adsorbed, the activated carbon itself becomes low-level radioactive waste, which requires special treatment and disposal methods.

[0005] Under the current treatment system, there is still a certain amount of unabsorbed radioactive gas that needs to be discharged after being adsorbed by activated carbon. Usually, this discharge is achieved through the exhaust duct on the top of the building, which is generally 3 meters above the roof to ensure that the gas diffuses into a higher air layer to reduce the direct impact on the near-ground environment. But even so, the unabsorbed radioactive gas still has a certain degree of pollution, posing a threat to the environment and public health.

[0006] Given the shortcomings of the above methods, the industry is currently facing severe technical challenges and urgently needs new solutions to improve the efficiency of radioactive gas treatment and reduce environmental emissions to meet increasingly stringent environmental protection standards and public health and safety needs. Therefore, proposing an improved technical solution is crucial to achieving these goals. Utility Model Content

[0007] The utility model aims to overcome the shortcomings of the prior art and provide a discharge structure for treating radioactive aerosols with high treatment efficiency.

[0008] The utility model is realized by the following technical solutions:

[0009] In order to solve the above technical problems, the utility model provides an emission structure for treating radioactive aerosols, including an exhaust duct extending upward, the upper end of the exhaust duct is provided with a downwardly bent elbow, the elbow is provided with a downward discharge port, a spraying device for spraying weak alkaline water mist is provided in the elbow, and a drying device for adsorbing water mist and radioactive substances is provided below the spraying device.

[0010] In order to further solve the technical problem to be solved by the utility model, the utility model provides an emission structure for treating radioactive aerosols, wherein the spraying device includes a liquid storage device for supplying a weak alkaline solution, and an electric water pump for extracting the weak alkaline solution, and the water outlet end of the electric water pump is connected to a plurality of spraying heads arranged in the elbow part.

[0011] In order to further solve the technical problem to be solved by the utility model, the utility model provides an emission structure for treating radioactive aerosols, wherein the electric water pump is connected to a control device, and the control device is also connected to a radioactive aerosol detector for detecting the concentration of radioactive aerosols in the treated workshop; when the radioactive aerosol detector detects that the concentration of radioactive aerosols exceeds the standard, it transmits a signal to the control device, and after receiving the signal, the control device controls the electric water pump to start spraying a weak alkaline solution into the elbow.

[0012] In order to further solve the technical problem to be solved by the utility model, the utility model provides an emission structure for treating radioactive aerosols, wherein the drying device includes a support member detachably connected to the elbow, and a desiccant is arranged in the support member.

[0013] In order to further solve the technical problem to be solved by the utility model, the utility model provides an emission structure for treating radioactive aerosols, wherein the air intake end of the exhaust duct is provided with a pre-filter device, an activated carbon filter section is provided in the pre-filter device, and activated carbon is provided in the activated carbon filter section.

[0014] Compared with the prior art, the utility model has the following advantages:

[0015] The design of the emission structure of the utility model fully considers the characteristics of radioactive aerosols and their potential impact on the environment, and realizes efficient treatment of radioactive aerosols through effective guidance of the exhaust duct, chemical treatment of the spraying device and physical adsorption of the drying device.

[0016] 1. Exhaust duct and its elbow: The elbow of the utility model bends downward, and no special rain protection treatment is required. The weak alkaline solution is not easy to return to the exhaust duct, which reduces the flow rate of the radioactive gas and facilitates the capture of the radioactive gas by water mist to form large particles.

[0017] 2. Spraying device: The spraying device located inside the elbow is responsible for spraying weak alkaline water mist to the passing radioactive aerosol. The role of weak alkaline water mist is twofold: on the one hand, it can react with the harmful components in the radioactive aerosol to reduce its radioactivity; on the other hand, the water mist can also capture and condense aerosol particles to facilitate the subsequent adsorption process.

[0018] 3. Drying device: The drying device is mainly used to absorb the water mist and radioactive substances still carried after the spraying treatment. Through the treatment of the drying device, not only the content of radioactive substances in the gas is further reduced, but also the gas discharged into the environment is prevented from containing too much water, ensuring the dryness and safety of the discharged gas.

[0019] 4. In order to manage the spraying process more intelligently and automatically, the electric water pump is equipped with a control device. The control device is connected to the radioactive aerosol detector, which is responsible for constantly monitoring the radioactive aerosol concentration in the workshop. When the radioactive aerosol detector does not detect radioactive aerosols, the electric water pump remains off, thereby saving energy and reducing unnecessary use of consumables. On the contrary, when radioactive aerosols are detected, the system can react quickly and take measures.

[0020] 5. The design of the drying device takes into account the convenient replacement of the desiccant. By adopting a detachable connection design, such as a threaded connection, the operator can easily remove the support from the elbow. This design not only makes the replacement process of the desiccant quick and simple, but also allows for a thorough inspection and cleaning of the support and desiccant, ensuring that the drying device is always in optimal working condition. This design makes the entire device more flexible and easy to maintain and replace the desiccant. And in such a design, the desiccant can be regenerated, which not only extends the service life of the desiccant, but also reduces operating costs and environmental impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings, wherein:

[0022] Figure 1 It is a structural schematic diagram of the utility model;

[0023] Figure 2 It is a three-dimensional structural diagram of the exhaust duct. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0025] like Figure 1 to Figure 2 The exhaust structure shown is used for treating radioactive aerosols, comprising an exhaust duct 1 extending upward, wherein the upper end of the exhaust duct 1 is provided with a downwardly bent elbow 11, wherein the elbow 11 is provided with a downwardly facing discharge port 111, wherein a spraying device 2 for spraying weakly alkaline water mist is provided in the elbow 11, and a drying device 3 for absorbing water mist and radioactive substances is provided below the spraying device 2.

[0026] The main body of the exhaust structure of the utility model is an exhaust duct 1 extending upward, which is designed to guide the radioactive aerosol to move upward and be discharged through a specific path. The upper end of the exhaust duct 1 is equipped with a downwardly bent elbow 11, which not only helps to change the flow direction of the gas, but more importantly, provides an ideal space for subsequent processing steps. The exhaust port 111 at the end of the elbow 11 is the outlet for the gas to be discharged to the outside after being processed.

[0027] The utility model specifically designs the elbow portion 11 to bend downward, and such a structure has many advantages:

[0028] First, since the elbow 11 is bent downward, it naturally forms a protective mechanism, making it difficult for rainwater to enter the exhaust duct. This design means that no additional rain protection measures are required, reducing the complexity and maintenance costs of the system. Even in bad weather, the system can maintain normal operation to ensure the continuous treatment of radioactive gases.

[0029] Secondly, the structural design of the elbow 11 helps to reduce the air flow velocity in the exhaust duct. When the radioactive gas enters the elbow, the air flow velocity naturally slows down due to the narrowing of the space and the change of direction. This deceleration effect makes it easier for the weak alkaline water mist sprayed in the elbow to contact the radioactive particles in the gas, thereby increasing the capture rate.

[0030] At the same time, this design not only improves the purification effect, but also prevents the backflow of weak alkaline solutions, avoiding corrosion or pollution to the inside of the exhaust duct.

[0031] In short, the elbow 11 of the utility model bends downward, and no special rain protection treatment is required. The weak alkaline solution is not easy to return to the exhaust pipe, which reduces the flow rate of the radioactive gas and facilitates its capture by water mist to form large particles.

[0032] The spraying device 2 of the utility model is responsible for spraying weak alkaline water mist to the passing radioactive aerosol. The role of weak alkaline water mist is twofold:

[0033] On the one hand, it can react with harmful components in radioactive aerosols and reduce their radioactivity;

[0034] On the other hand, water mist can also capture and condense aerosol particles, facilitating the subsequent adsorption process. Radioactive gases form large particles that are easily captured, which improves the adsorption effect of radioactive gases and reduces the amount of radioactive gases emitted into the atmosphere.

[0035] The drying device 3 installed below the spraying device is another important part of the treatment process. This device is mainly used to absorb the water mist and radioactive substances still carried after the spraying treatment. Through the treatment of the drying device, not only the content of radioactive substances in the gas is further reduced, but also the gas discharged into the environment is prevented from containing too much water, ensuring the dryness and safety of the discharged gas.

[0036] In summary, the design of the emission structure fully considers the characteristics of radioactive aerosols and their potential impact on the environment, and achieves efficient treatment of radioactive aerosols through effective guidance of the exhaust duct, chemical treatment of the spraying device and physical adsorption of the drying device.

[0037] More specifically, the air inlet end of the exhaust duct 1 is provided with a pre-filter device 5, and an activated carbon filter section 51 is provided in the pre-filter device 5, and activated carbon is provided in the activated carbon filter section 51. The pre-filter device 5 is located at the air inlet end of the exhaust duct, and its main function is to perform preliminary filtering and adsorption treatment before the aerosol enters the exhaust system.

[0038] The core component of the pre-filter device 5 is the activated carbon filter section 51, which has a large amount of activated carbon built in. Activated carbon is a very effective adsorption material, which has an extremely high specific surface area and can adsorb a large amount of harmful gases and particulate matter. When the radioactive aerosol passes through the activated carbon filter section 51, the activated carbon can effectively adsorb the radioactive substances in the aerosol, as well as other possible toxic and harmful substances, thereby reducing the burden of subsequent treatment at the source.

[0039] Overall treatment process: The radioactive gas first enters the pre-filter device 5 and undergoes preliminary adsorption treatment through the activated carbon filter section 51. This step not only removes the radioactive substances in the gas, but also reduces the load for subsequent treatment. The gas treated with activated carbon enters the exhaust duct, and is then sprayed with weak alkaline water mist in the elbow 11 for further reaction and condensation. Spraying weak alkaline water mist can not only neutralize the acidic substances in the gas, but also promote the combination of radioactive particles and water mist to form larger particles, which are easy to capture. Finally, the sprayed gas enters the drying device 3 for drying. The desiccant in the drying device absorbs the water mist and also adsorbs the remaining radioactive substances, so that the gas discharged into the environment meets more stringent safety standards.

[0040] More specifically, the utility model relates to a spraying device 2 designed specifically for spraying weak alkaline solution when treating radioactive aerosols. The overall system is designed to improve the efficiency and effectiveness of radioactive contamination control.

[0041] The core components of the spraying device 2 are a liquid storage device 21 and an electric water pump 22. The liquid storage device 21 is used to store a pre-configured weak alkaline solution, which has a good effect on neutralizing and adsorbing radioactive particles.

[0042] The electric water pump 22 has the function of extracting weak alkaline solution from the liquid storage device 21, and transporting the solution to a plurality of spray heads 23 through its water outlet. These spray heads 23 are evenly arranged inside the elbow 11, which can ensure the uniform distribution and spraying of the weak alkaline solution so as to react more effectively with the passing radioactive aerosol.

[0043] The weak alkaline solution refers to a solution with a pH value slightly higher than 7 (usually between 7 and 9). They have the ability to neutralize acidic substances, but their alkalinity is relatively weak. Common weak alkaline solutions include sodium carbonate solution (Na2CO3), sodium bicarbonate solution (NaHCO3), boric acid solution (H3BO3), ammonium dihydrogen phosphate solution (NH4H2PO4) and ammonia water (NH4OH).

[0044] In order to manage the spraying process more intelligently and automatically, the electric water pump 22 is equipped with a control device. The control device is connected to the radioactive aerosol detector 4, which is responsible for continuously monitoring the radioactive aerosol concentration in the workshop.

[0045] Once the radioactive aerosol detector 4 detects that the aerosol concentration exceeds the safety standard, it will send a signal to the control device. After receiving the signal, the control device immediately starts the electric water pump 22, activates the spraying system, and sprays the weak alkaline solution into the elbow 11. This design can effectively treat the radioactive aerosol in advance before it reaches the roof treatment system.

[0046] Since the radioactive aerosol detector 4 is installed inside the workshop, there is a time window of several minutes from the detection of radioactive aerosol to the arrival of the aerosol at the roof exhaust duct 1. This time allows the system to start the spraying program in time and increase the size of aerosol particles before the radioactive material reaches the roof, which helps the drying device 3 to capture these particles more efficiently.

[0047] The automated design of the spraying device 2 significantly improves the response speed and processing efficiency of the entire system. The automated system is also conducive to reducing human operating errors and ensuring the continuity and stability of the processing process. When the radioactive aerosol detector 4 does not detect radioactive aerosols, the electric water pump 22 remains in a closed state, thereby saving energy and reducing unnecessary use of consumables. On the contrary, when radioactive aerosols are detected, the system can respond quickly and take measures.

[0048] In summary, the design and function of the spraying device 2 are closely centered on improving the real-time, effectiveness, and automation level of radioactive aerosol treatment. By working in conjunction with the radioactive aerosol detector 4, the system can achieve preventive treatment before radioactive contamination reaches critical areas, thereby significantly improving environmental protection and personnel safety.

[0049] It is worth noting that the radioactive aerosol detector 4 is a common detection device, which is a device specially used to detect radioactive particles in the air. The detector can continuously monitor the concentration of radioactive particles in the environment, and has high sensitivity and accuracy, and can detect trace amounts of radioactive aerosols in the first time.

[0050] Typically, the radioactive aerosol detector 4 will include one or more sensors to capture and measure radioactive particles in the air. These sensors may be based on different detection principles, such as α, β or γ ray detection, to identify different types of radioactive substances. Once radioactive particles are detected, these sensors will convert the signal into an electrical signal, which is then analyzed by the processing unit of the detector.

[0051] The processing unit of the detector is designed with an advanced algorithm that can calculate the concentration of radioactive particles and compare it with the preset safety threshold. If the measured concentration exceeds the safety range, the detector will activate the alarm system and send a signal to the electric water pump 22 of the spraying device 2 through the control device, instructing it to start spraying weak alkaline solution to neutralize the radioactive particles.

[0052] In addition, radioactive aerosol detectors usually have data logging capabilities, which allows monitoring data to be stored and reviewed for later data analysis and environmental monitoring. These data are crucial for evaluating the effectiveness of the spraying system, optimizing operating parameters, and developing future safety measures.

[0053] In general, the radioactive aerosol detector 4 plays an indispensable role in the entire spraying system. It not only ensures the automatic response of the system, but also provides strong scientific support for radioactive contamination control through continuous monitoring and data recording.

[0054] More specifically, the drying device 3 includes a support member 31 detachably connected to the elbow portion 11, and a desiccant 32 is arranged in the support member 31. The design of the drying device takes into account the convenient replacement of the desiccant. By adopting a detachable connection design, such as a threaded connection, the operator can easily remove the support member 31 from the elbow portion 11. This design not only makes the replacement process of the desiccant quick and simple, but also allows the support member 31 and the desiccant 32 to be thoroughly inspected and cleaned, ensuring that the drying device is always in the best working condition.

[0055] This design makes the whole device more flexible and convenient for maintenance and replacement of desiccant. In addition, in such a design, the desiccant can be regenerated, which not only extends the service life of the desiccant, but also reduces operating costs and environmental impact.

[0056] The support member 31 is a hollow support container for supporting and accommodating the desiccant 32 and allowing gas to pass through. The internal space of the support member 31 is sufficient to accommodate the desiccant 32, and its hollow structural design ensures that the gas can pass through the desiccant layer evenly. This uniform gas flow not only helps to improve the drying efficiency, but also ensures a longer service life of the desiccant because it can promote a more even distribution of moisture and adsorbed radioactive substances in the desiccant.

[0057] Among them, the detachable connection structure between the elbow 11 and the support member 31 is preferably a threaded connection. The advantage of this threaded connection is that it is both reliable and convenient, and can be tightened or loosened manually without the need for special tools. In this way, the operator can easily remove the support member 31, replace or regenerate the desiccant 32, and then reinstall it in place, and the whole process is simple and quick. Another advantage of the threaded connection is that it provides good sealing performance, which is particularly important for preventing gas leakage and ensuring that the desiccant is not contaminated by the outside world. In addition, the threaded connection also allows the tightness of the connection to be adjusted under different operating conditions to adapt to different pressure and temperature conditions.

[0058] The desiccant 32 can absorb water mist, and the radioactive substances are also adsorbed and solidified on the desiccant, effectively reducing the radioactive substances discharged into the atmosphere. There are many common types of desiccant 32, such as limestone (CaCO3), silica gel (SiO2), molecular sieve, activated carbon, montmorillonite, etc., which will not be described here.

Claims

1. An emission structure for treating radioactive aerosols, characterized in that: The invention comprises an exhaust duct (1) extending upward, wherein the upper end of the exhaust duct (1) is provided with an elbow (11) bending downward, wherein the elbow (11) is provided with a downward discharge port (111), wherein a spraying device (2) for spraying weak alkaline water mist is provided in the elbow (11), and a drying device (3) for absorbing water mist and radioactive substances is provided below the spraying device (2).

2. The discharge structure for treating radioactive aerosols according to claim 1, characterized in that: The spraying device (2) comprises a liquid storage device (21) for supplying a weak alkaline solution, and an electric water pump (22) for extracting the weak alkaline solution, wherein a water outlet end of the electric water pump (22) is connected to a plurality of spraying heads (23) arranged in the elbow portion (11).

3. The discharge structure for treating radioactive aerosols according to claim 2, characterized in that: The electric water pump (22) is connected to a control device, and the control device is also connected to a radioactive aerosol detector (4) for detecting the concentration of radioactive aerosols in the treated workshop; when the radioactive aerosol detector (4) detects that the concentration of radioactive aerosols exceeds the standard, it transmits a signal to the control device, and after receiving the signal, the control device controls the electric water pump (22) to start spraying a weak alkaline solution into the elbow (11).

4. The discharge structure for treating radioactive aerosols according to claim 1, characterized in that: The drying device (3) comprises a support member (31) detachably connected to the inside of the elbow (11), and a desiccant (32) is arranged inside the support member (31).

5. The discharge structure for treating radioactive aerosols according to claim 1, characterized in that: The air intake end of the exhaust duct (1) is provided with a pre-filter device (5), an activated carbon filter section (51) is provided inside the pre-filter device (5), and activated carbon is provided inside the activated carbon filter section (51).

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