Apparatus for treating liquid effluent using a carrier strip evaporation process

Abstract

The application discloses a device for treating liquid effluent by using a carrier vaporization process, which comprises a primary filter, a dehumidification and heating device, a wet membrane humidification device, a centrifugal fan, a circulating water tank, a circulating pump and an access door, the dehumidification and heating device is installed at one end of the primary filter, and the wet membrane humidification device is located at one side of the dehumidification and heating device. The device for treating liquid effluent by using a carrier vaporization process can extract radioactive waste liquid from the water tank by using the circulating pump, make the stainless steel membrane uniformly wet, then open the fan, first suck the air outside the device into the primary filter and the dehumidification device, filter and dehumidify the external air, then suck the treated air into the stainless steel wet membrane, form vaporization, and finally discharge the humidified air by the fan, so that the efficiency of treating the radioactive waste liquid is improved, and the device can realize "near-zero emission and near-zero pollution" and better protect the environment.

Description

Technical Field

[0001] This invention relates to the field of radioactive waste liquid treatment technology, and in particular to equipment for treating liquid effluents using a carrier evaporation process. Background Technology

[0002] A radioactive waste treatment device is a supporting facility for the treatment and discharge of radioactive waste. The nuclear island generates approximately 600 m³ of treated low-level radioactive waste (<100 bq / L) annually. In typical nuclear power plants, this waste can be treated as liquid effluent through a tank discharge system. However, to achieve the design goal of "near-zero emissions and near-zero pollution" for the heated reactor, and considering various factors, the radioactive waste treatment system is proposed to employ a carrier evaporation process to treat the liquid effluent through gaseous diffusion. The carrier evaporation device is a key component of this process, and its performance directly impacts the treatment effect. With continuous technological advancements, the manufacturing requirements for radioactive waste treatment devices are becoming increasingly stringent.

[0003] Existing radioactive waste liquid treatment devices have certain drawbacks in use. Nowadays, the annual nuclear emissions from nuclear islands are relatively large, and the emission standards cannot be met well. In order to approach the treatment effect of "zero pollution and zero emission", it is imperative to improve the treatment effect of radioactive waste liquid. Therefore, we propose a device that uses a carrier evaporation process to treat liquid effluents. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a device for treating liquid effluents using a carrier evaporation process. A circulating pump draws radioactive waste liquid from a water tank, uniformly wetting a stainless steel membrane. A fan is then activated, drawing in outside air through a primary filter and dehumidifier for filtration and dehumidification. The treated air is then drawn into the stainless steel wet membrane, where it vaporizes. Finally, the humidified air is discharged by the fan, improving the efficiency of radioactive waste liquid treatment and achieving near-zero emissions and near-zero pollution, thus better protecting the environment and effectively solving the problems in the prior art.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: an equipment for treating liquid effluent using a carrier evaporation process, comprising a pre-filter, a dehumidification and heating device, a wet film humidification device, a centrifugal fan, a circulating water tank, a circulating pump, and an inspection door. The dehumidification and heating device is installed at one end of the pre-filter, the wet film humidification device is located to one side of the dehumidification and heating device and is installed above the circulating water tank, the circulating pump is installed between the wet film humidification device and the circulating water tank, the centrifugal fan is installed to one side of the wet film humidification device, a fan base is positioned at the bottom of the centrifugal fan, a motor base is fixedly installed on the outside of the fan base, a drive motor is bolted to the motor base, a reduction gearbox is connected to one end of the drive motor, and a drive shaft is connected to the other end of the reduction gearbox. The drive shaft is connected to the centrifugal fan.

[0008] As a preferred technical solution of this application, the outer side of the primary filter is connected to an air valve and an air inlet, the centrifugal fan and the wet membrane humidification device are connected to an air intake hood and an air inlet pipe, the centrifugal fan is positioned and connected to an exhaust pipe, the outlet end of the exhaust pipe is provided with an atmospheric exhaust port, the primary filter includes a stainless steel filter frame, a proportional valve and a non-woven filter material, the non-woven filter material is located on the stainless steel filter frame, and the bottom of the wet membrane humidification device is fitted with a water collection tank.

[0009] As a preferred technical solution of this application, the dehumidification heating device includes a cylinder, a guide plate and a branch tube-shaped electric heating element. The guide plate is located on the cylinder, and the branch tube-shaped electric heating element is positioned inside the cylinder. The branch tube-shaped electric heating element has a high-temperature resistance wire positioned inside the metal tube, and the gap is tightly filled with crystalline magnesium oxide powder with good insulation and thermal conductivity.

[0010] As a preferred technical solution of this application, a stainless steel frame for a wet film is positioned and installed on the outside of the wet film humidification device, a stainless steel wet film is positioned on the upper surface of the wet film humidification device, a second connecting pipe is connected between the wet film humidification device and the circulating pump, a first connecting pipe is connected between the circulating water tank and the circulating pump, and a water inlet is provided at the position where the second connecting pipe connects to the wet film humidification device.

[0011] As a preferred technical solution of this application, the primary filter is positioned and installed between the dehumidification heating device and the dehumidification heating device, the dehumidification heating device is connected to the wet film humidification device, the wet film humidification device is connected to the centrifugal fan, and the wet film humidification device, the circulating water tank, and the circulating pump are connected. The drive motor and the reduction gearbox drive the position of the drive shaft and drive the centrifugal fan to work.

[0012] As a preferred technical solution of this application, the primary filter is connected to the air valve and the air inlet, the centrifugal fan is connected to the wet film humidification device through the air intake hood and the air inlet pipe, the centrifugal fan is positioned and connected to the discharge pipe, and the non-woven filter material is positioned and connected to the stainless steel frame of the filter.

[0013] As a preferred technical solution of this application, the cylinder and the guide plate are positioned and installed together, the branch tube electric heating element is positioned and installed inside the dehumidification heating device, the guide plate makes the air heat up evenly when it circulates, and multiple sets of branch tube electric heating elements are provided.

[0014] As a preferred technical solution of this application, the circulating pump is connected to the wet film humidification device through a second connecting pipe and a water inlet, the circulating pump is connected to the circulating water tank, the circulating pump controls the circulating delivery of water between the wet film humidification device and the water source inside the circulating water tank, and the wet film humidification device is positioned relative to the stainless steel wet film.

[0015] (III) Beneficial Effects

[0016] Compared with existing technologies, this invention provides a device for treating liquid effluents using a carrier evaporation process, which has the following beneficial effects: This device uses a circulating pump to draw radioactive waste liquid from a water tank, uniformly wetting a stainless steel membrane. Then, a fan is turned on, drawing in outside air into a primary filter and dehumidifier for filtration and dehumidification. The treated air is then drawn into the stainless steel wet membrane, where it vaporizes. Finally, the humidified air is discharged by the fan, improving the efficiency of radioactive waste liquid treatment and achieving near-zero emissions and near-zero pollution, thus better protecting the environment. The system employs a combination of components including a primary filter, dehumidification and heating device, wet membrane, centrifugal fan, circulating water tank, circulating pump, and inspection door, all interconnected to allow radioactive waste liquid to evaporate and be released into the atmosphere. It boasts high treatment efficiency, strong resistance to shock loads, and stable operation even under high loads. It achieves near-zero pollution and zero emissions. It occupies a small area, has low investment costs, and a short construction period. It offers large processing capacity and low operating costs. Its modular design makes it simple to disassemble, install, and transport. It is highly automated, requiring no personnel on-site. The entire radioactive waste liquid treatment device is simple in structure, easy to operate, and performs better than traditional methods. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the equipment for treating liquid effluent using a carrier evaporation process according to the present invention.

[0018] Figure 2 This is a schematic cross-sectional view of the equipment used in this invention to process liquid effluents using a carrier evaporation process.

[0019] Figure 3 This is a schematic diagram of the structure of the primary filter in the device of the present invention that uses a carrier evaporation process to treat liquid effluent.

[0020] Figure 4 This is a schematic diagram of the dehumidification and heating device in the equipment of the present invention that utilizes a carrier evaporation process to treat liquid effluent.

[0021] Figure 5 This is a schematic diagram of the wet film humidification device in the equipment of the present invention that utilizes a carrier evaporation process to treat liquid effluent.

[0022] In the diagram: 1. Pre-filter; 2. Dehumidification and heating device; 3. Wet film humidification device; 4. Centrifugal fan; 5. Circulating water tank; 6. Circulating pump; 7. Inspection door; 8. Air valve; 9. Air inlet; 10. First connecting pipe; 11. Second connecting pipe; 12. Water collection tank; 13. Atmospheric exhaust port; 14. Exhaust pipe; 15. Suction hood; 16. Air inlet pipe; 17. Fan base; 18. Drive shaft; 19. Gearbox; 20. Drive motor; 21. Motor base; 22. Stainless steel frame of filter; 23. Proportional valve; 24. Non-woven filter material; 25. Cylinder; 26. Baffle plate; 27. Branch tubular electric heating element; 28. Water inlet; 29. ​​Stainless steel wet film; 30. Stainless steel frame of wet film. Detailed Implementation

[0023] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and specific embodiments. However, those skilled in the art will understand that the embodiments described below are some embodiments of the present invention, but not all embodiments, and are only used to illustrate the present invention, and should not be regarded as limiting the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall be followed. Where the manufacturers of reagents or instruments are not specified, they are all conventional products that can be purchased commercially.

[0024] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0026] like Figure 1-5 As shown, the equipment for treating liquid effluent using a carrier evaporation process includes a pre-filter 1, a dehumidification and heating device 2, a wet film humidification device 3, a centrifugal fan 4, a circulating water tank 5, a circulating pump 6, and an inspection door 7. The dehumidification and heating device 2 is installed at one end of the pre-filter 1. The wet film humidification device 3 is located to one side of the dehumidification and heating device 2 and is installed above the circulating water tank 5. The circulating pump 6 is installed between the wet film humidification device 3 and the circulating water tank 5. The centrifugal fan 4 is installed to one side of the wet film humidification device 3. A fan base 17 is positioned at the bottom of the centrifugal fan 4. A motor base 21 is fixedly installed on the outside of the device. A drive motor 20 is installed on the motor base 21 by bolts. A gearbox 19 is connected to one end of the drive motor 20, and a drive shaft 18 is connected to the other end of the gearbox 19. The drive shaft 18 is connected to the centrifugal fan 4. The primary filter 1 is positioned between the primary filter and the dehumidification heating device 2. The dehumidification heating device 2 is connected to the wet film humidification device 3. The wet film humidification device 3 is connected to the centrifugal fan 4. The wet film humidification device 3, the circulating water tank 5, and the circulating pump 6 are connected. The drive motor 20 and the gearbox 19 drive the drive shaft 18 and drive the centrifugal fan 4 to work.

[0027] Furthermore, the outer side of the pre-filter 1 is connected to an air valve 8 and an air inlet 9. The centrifugal fan 4 and the wet membrane humidification device 3 are connected by an air intake hood 15 and an air inlet pipe 16. An exhaust pipe 14 is positioned and connected to the centrifugal fan 4. An atmospheric exhaust port 13 is opened at the outlet end of the exhaust pipe 14. The pre-filter 1 includes a stainless steel filter frame 22, a proportional valve 23, and a non-woven filter material 24. The non-woven filter material 24 is located on the stainless steel filter frame 22. A water collection tank 12 is snapped into the bottom of the wet membrane humidification device 3. The pre-filter 1 is connected to the air valve 8 and the air inlet 9. The centrifugal fan 4 and the wet membrane humidification device 3 are connected through the air intake hood 15 and the air inlet pipe 16. The centrifugal fan 4 and the exhaust pipe 14 are positioned and connected. The non-woven filter material 24 and the stainless steel filter frame 22 are positioned and connected.

[0028] Furthermore, the dehumidification heating device 2 includes a cylinder 25, a guide plate 26, and a branch-shaped electric heating element 27. The guide plate 26 is located on the cylinder 25, and the branch-shaped electric heating element 27 is positioned inside the cylinder 25. The branch-shaped electric heating element 27 has a high-temperature resistance wire positioned inside the metal tube, and the gaps are tightly filled with crystalline magnesium oxide powder with good insulation and thermal conductivity. The cylinder 25 and the guide plate 26 are positioned and installed together, and the branch-shaped electric heating element 27 is positioned and installed inside the dehumidification heating device 2. The guide plate 26 ensures that the air is heated evenly when it circulates. Multiple sets of branch-shaped electric heating elements 27 are provided.

[0029] Furthermore, a stainless steel frame 30 for the wet film humidification device 3 is positioned and installed on the outside of the wet film humidification device 3, and a stainless steel wet film 29 is positioned on the upper surface of the wet film humidification device 3. A second connecting pipe 11 connects the wet film humidification device 3 to the circulating pump 6, and a first connecting pipe 10 connects the circulating water tank 5 to the circulating pump 6. An inlet 28 is provided at the position where the second connecting pipe 11 connects to the wet film humidification device 3. The circulating pump 6 is connected to the wet film humidification device 3 through the second connecting pipe 11 and the inlet 28. The circulating pump 6 is connected to the circulating water tank 5. The circulating pump 6 controls the circulation and transportation of water between the wet film humidification device 3 and the internal water source of the circulating water tank 5. The wet film humidification device 3 is positioned relative to the stainless steel wet film 29.

[0030] Example:

[0031] like Figure 1 As shown, this application includes a primary filter 1, a dehumidification and heating device 2, a wet membrane, a centrifugal fan 4, a circulating water tank 5, a circulating pump 6, and an inspection door 7.

[0032] The pre-filter 1 includes a stainless steel frame and non-woven filter material 24. The stainless steel frame wet-fixes the non-woven filter material 24. The non-woven filter material 24 captures and adsorbs dust particles of different sizes in the air, thereby improving air quality. In addition to adsorbing dust, the filter can also block flying insects and foreign objects such as leaves. Each set of pre-filter 1 has a filtration accuracy of 2-10μm. When the pressure difference is greater than 80Pa, the pre-filter 1 needs to be replaced.

[0033] The dehumidification heating device 2 includes multiple tubular electric heating elements 27, a cylinder 25, and a baffle plate 26. The tubular electric heating elements are made by placing high-temperature resistance wires inside metal tubes and tightly filling the gaps with crystalline magnesium oxide powder, which has good insulation and thermal conductivity. The baffle plate installed inside the cylinder 25 can make the air heat up evenly during circulation and has good control precision. This dehumidification heating device 2 has good thermal conductivity, high temperature resistance, long service life, and is safe and reliable.

[0034] The wet membrane includes a stainless steel frame, a water inlet 28, and a stainless steel wet membrane 29. The stainless steel wet membrane 29 is sprayed downwards through small holes in the water distribution pipe. The humidifying medium is evenly distributed through a hydrophobic medium. The humidifying medium provides a large contact area between the air and water to form a water film. Through continuous water circulation, heat and moisture exchange occurs with the air, increasing the humidity of the air and directly evaporating and carrying away the waste liquid. To further enhance the humidification and evaporation effect, a high-pressure spray system is installed in front of the wet membrane. The waste liquid water mist sprayed from a specially designed nozzle exchanges heat and moisture with the air to meet the evaporation requirements.

[0035] Centrifugal fan 4 adopts a double-intake centrifugal exhaust fan. Centrifugal fan 4 is a relatively precise operating machine. It relies on the rotation of the impeller to create negative pressure inside the fan, which draws in external gas and discharges it through the impeller channel and volute.

[0036] The circulating water tank 5 is made of 304 stainless steel, and its effective capacity is 1.5m³. 3 .

[0037] The circulating pump 6 is a pipeline booster pump.

[0038] The inspection door 7 includes a stainless steel door frame and a stainless steel door handle, with the outer surface coated with anti-rust paint.

[0039] Working Principle: This invention includes a pre-filter 1, a dehumidification and heating device 2, a wet film humidification device 3, a centrifugal fan 4, a circulating water tank 5, a circulating pump 6, an inspection door 7, an air valve 8, an air inlet 9, a first connecting pipe 10, a second connecting pipe 11, a water collection tank 12, an atmospheric exhaust port 13, an exhaust pipe 14, an air intake hood 15, an air inlet pipe 16, a fan base 17, a drive shaft 18, a gearbox 19, a drive motor 20, a motor base 21, a stainless steel filter frame 22, a proportional valve 23, non-woven filter material 24, a cylinder 25, a guide plate 26, a branch-shaped electric heating element 27, and a water inlet 28. The system comprises a stainless steel wet membrane 29 and a stainless steel frame 30, mainly consisting of the radioactive waste liquid to be treated and a carrier evaporation treatment device. The carrier evaporation treatment device includes a primary filter, a heating and dehumidification device, the stainless steel wet membrane 29, a water tank, a circulating pump 6, and a fan. The primary filter frame is made of stainless steel plate, and the filter material is non-woven synthetic fiber fabric. The electric heater consists of multiple tubular heating elements 27, a housing, and a guide plate 26. The stainless steel wet membrane 29 undergoes surface punching and piercing, is rolled with fine water-retaining corrugations, and is passivated and hydrophilic treated. The fan is a double-intake centrifugal exhaust fan. This technology primarily utilizes the circulating pump 6 to extract the radioactive waste liquid from the water tank, ensuring the stainless steel membrane is evenly wetted. Then, the fan is activated, drawing in outside air into the primary filter and dehumidification device for filtration and dehumidification. The treated air is then drawn into the stainless steel wet membrane 29, where it vaporizes. Finally, the humidified air is discharged by the fan. This technology can improve the efficiency of treating radioactive waste liquid, achieving "near-zero emissions and near-zero pollution," and has been used to protect the environment. This invention utilizes the principle of air humidification. The treated liquid effluent from the heating reactor, meeting emission standards, is humidified through a wet membrane before being discharged into the atmosphere. The purified wastewater enters the circulating water tank 5 of this device from an elevated water tank, and is then pumped by a circulating pump 6 into the primary filter 1. After filtration, it enters the wet membrane humidification device 3. Water permeates downwards from the top of the wet membrane, being absorbed to form a uniform water film. When dry air is drawn into the wet membrane device by a fan, some water comes into contact with the dry air, absorbs heat, and vaporizes, thus humidifying the air. The humidified air is discharged into the atmosphere by the fan, while the unhumidified waste liquid returns to the circulating water tank 5 and is discharged after circulation.

[0040] It should be noted that, in this document, relational terms such as first and second (number one, number two), etc., are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. An apparatus for treating liquid effluent using a carrier evaporation process, comprising a primary filter (1), a dehumidification and heating device (2), a wet film humidification device (3), a centrifugal fan (4), a circulating water tank (5), a circulating pump (6), and an inspection door (7), characterized in that: The dehumidification heating device (2) is installed at one end of the primary filter (1). The wet film humidification device (3) is located on one side of the dehumidification heating device (2) and is installed above the circulating water tank (5). The circulating pump (6) is installed between the wet film humidification device (3) and the circulating water tank (5). The centrifugal fan (4) is installed on one side of the wet film humidification device (3). A fan base (17) is positioned at the bottom of the centrifugal fan (4). A motor base (21) is fixedly installed on the outside of the fan base (17). A drive motor (20) is installed on the motor base (21) by bolts. A reduction gearbox (19) is connected to the end of the drive motor (20), and a drive shaft (18) is connected to the other end of the reduction gearbox (19). The drive shaft (18) is connected to the position of the centrifugal fan (4). The outer side of the primary filter (1) is connected to an air valve (8) and an air inlet (9). The centrifugal fan (4) and the wet membrane humidification device (3) are connected to an air intake hood (15) and an air inlet pipe (16). The centrifugal fan (4) is connected to an exhaust pipe (14). The exhaust pipe (14) has an atmospheric exhaust port (13) at its outlet end. The primary filter (1) includes a stainless steel filter frame (22), a proportional valve (23), and a non-woven filter material (24). The non-woven filter material (24) is located on the stainless steel filter frame (22). The bottom of the wet membrane humidification device (3) is fitted with a water collection tank (12). The dehumidification heating device (2) includes a cylinder (25), a guide plate (26) and a branch tube electric heating element (27). The guide plate (26) is located on the cylinder (25), and the branch tube electric heating element (27) is positioned inside the cylinder (25). The branch tube electric heating element (27) has a high-temperature resistance wire positioned inside a metal tube, and the gap is tightly filled with crystalline magnesium oxide powder with good insulation and thermal conductivity. A stainless steel frame (30) is positioned on the outside of the wet film humidification device (3), a stainless steel wet film (29) is positioned on the upper surface of the wet film humidification device (3), a second connecting pipe (11) is connected between the wet film humidification device (3) and the circulation pump (6), a first connecting pipe (10) is connected between the circulation tank (5) and the circulation pump (6), and an inlet (28) is provided at the position where the second connecting pipe (11) connects to the wet film humidification device (3). The primary filter (1) is positioned and installed between the dehumidification heating device (2), the dehumidification heating device (2) is connected to the wet film humidification device (3), the wet film humidification device (3) is connected to the centrifugal fan (4), and the wet film humidification device (3), the circulating water tank (5), and the circulating pump (6) are connected. The drive motor (20) and the gearbox (19) drive the position of the drive shaft (18) and drive the centrifugal fan (4) to work. The primary filter (1) is connected to the air valve (8) and the air inlet (9). The centrifugal fan (4) is connected to the wet film humidification device (3) through the air intake hood (15) and the air inlet pipe (16). The centrifugal fan (4) is positioned connected to the discharge pipe (14). The non-woven filter material (24) is positioned connected to the stainless steel frame of the filter (22). The cylinder (25) is positioned and installed between the guide plate (26), the branch tube electric heating element (27) is positioned and installed inside the dehumidification heating device (2), the guide plate (26) makes the air heat evenly when it circulates, and multiple sets of the branch tube electric heating element (27) are provided. The circulating pump (6) is connected to the wet film humidification device (3) through the second connecting pipe (11) and the water inlet (28). The circulating pump (6) is connected to the circulating water tank (5). The circulating pump (6) controls the circulation of water between the wet film humidification device (3) and the circulating water tank (5). The wet film humidification device (3) is positioned with the stainless steel wet film (29).

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