A mobile evaporation tank for radioactive wastewater

Abstract

This invention belongs to the field of environmental protection equipment technology, specifically a mobile evaporation tank for radioactive wastewater. It includes a water tank with a greenhouse cover fixedly installed on top and an internal circulation device inside. This mobile evaporation tank for radioactive wastewater achieves sealed control, unaffected by external environmental factors. Simultaneously, it employs a forced gas-liquid convection device, effectively increasing the evaporation temperature, reducing air humidity, and accelerating the evaporation process. Furthermore, it utilizes membrane technology, leveraging the membrane's vast surface area to increase the evaporation surface area several times over, thus increasing the treatment capacity by tens of times compared to traditional evaporation tanks. Unaffected by the application area, it becomes a universally applicable and highly efficient tool for treating radionuclide wastewater, with extremely broad application potential in the decommissioning of old evaporation tanks, the construction of new evaporation tanks, and the treatment of nuclear industry wastewater discharges in different regions.

Description

Technical Field

[0001] This invention relates to the field of environmental protection equipment technology, and in particular to a mobile evaporation tank for radioactive wastewater. Background Technology

[0002] Radioactive wastewater refers to liquid waste containing radionuclides, typically containing radioactive elements, nitrates or hydrochlorides, and often large amounts of acids and alkalis. It is highly radioactive, difficult to treat, and prone to scaling. To meet the needs of production separation and subsequent environmental protection, it is necessary to separate radionuclides and heavy metals from acids. Traditional separation methods include neutralization precipitation, distillation, and ion exchange resin methods. However, due to the high acidity, neutralization consumes large amounts of alkali and generates significant secondary pollutants. Distillation, with its high acidity, consumes substantial energy and requires highly sophisticated equipment. Furthermore, the presence of large amounts of radionuclides and heavy metals causes scaling, affecting heat transfer and posing a risk of explosion at extreme concentrations. It also generates secondary pollutants during equipment cleaning. Membrane methods, particularly reverse osmosis, membrane distillation, and electrodialysis, offer a more convenient and readily implementable approach. However, the need for heating, pressurization, and electricity complicates equipment, and membrane fouling leads to complex treatment processes, short membrane lifespan, and increased secondary pollution. Evaporation tank technology offers advantages such as convenient equipment, low investment, and no operating costs, making it an essential and cost-effective treatment method in suitable areas.

[0003] Traditional evaporation ponds cause soil pollution, and in recent years, especially in the treatment of radioactive wastewater, mobile evaporation ponds have been adopted. This has increased equipment costs and secondary pollution. Furthermore, neither traditional nor mobile evaporation pond technologies have solved the following challenges:

[0004] 1. Due to the low evaporation efficiency, evaporation ponds generally occupy a very large area, which limits their use to locations where only extremely cheap land is available.

[0005] 2. Open spaces present several problems: a) Secondary pollution to the external air environment, such as the release of radioactive materials due to dryness, and the volatilization of large amounts of pollutants causing air pollution. b) Birds entering the open space, potentially spreading contamination. c) Rainwater entering due to the openness.

[0006] 3. Because the evaporation tank is an environment integrated with the external environment, it is impossible to control the temperature and humidity. It is greatly affected by the external environment, which also limits its application to geographical areas. It can only be used in areas with high evaporation and low rainfall.

[0007] To address the aforementioned technical issues, a mobile evaporation tank for radioactive wastewater is needed. Summary of the Invention

[0008] Based on existing technical problems, this invention proposes a mobile evaporation tank for radioactive wastewater.

[0009] This invention proposes a mobile evaporation tank for radioactive wastewater, comprising a water tank, the top of which is fixedly equipped with a greenhouse cover. The greenhouse cover is a heat-insulating and light-transmitting material composed of light-transmitting and UV-resistant materials, preferably inorganic glass, plexiglass, or transparent plastic films such as PI, PP, and PBI. By setting the greenhouse cover, the water tank is controlled to form a closed space. An internal circulation device is set inside the water tank, which includes exhaust pipes and condenser heating pipes. Multiple exhaust pipes and multiple condenser heating pipes are distributed vertically inside the water tank. The exhaust pipes are located above the condenser heating pipes, and both ends of the exhaust pipes and the condenser heating pipes extend through and to the outer surfaces of both sides of the water tank.

[0010] An automatic conveying and desalination mechanism is installed above the water tank. The automatic conveying and desalination mechanism includes a conveying shaft. Both ends of the conveying shaft pass through and extend to the outer surfaces of both sides of the greenhouse cover. The water tank is made of a corrosion-resistant and radiation-resistant material, preferably PVDF, carbon fiber, stainless steel, or a combination of multiple materials.

[0011] Preferably, the waste liquid to be treated is disposed inside the water tank, and the water level of the waste liquid to be treated in the water tank is selected to be 700mm-1000mm. The multiple condensing heating tubes are all located inside the waste liquid to be treated.

[0012] Preferably, the surfaces of the plurality of exhaust pipes and the surfaces of the plurality of condenser heating pipes are all wrapped with absorbent cloth, the surface of the absorbent cloth is connected to the surface of the conveyor shaft, and the absorbent cloth is woven from a radiation-resistant and UV-resistant absorbent material, preferably a radiation-resistant PP nonwoven fabric, activated carbon, carbon fiber, cellulose, etc.

[0013] Preferably, L-shaped bearing seats are fixedly connected to both sides of the top of the water tank. The opposite surfaces of the two L-shaped bearing seats are fixedly connected to both ends of the conveyor shaft through bearings. A drive motor is fixedly connected to one side surface of one of the L-shaped bearing seats. The output shaft of the drive motor is fixedly connected to one end of the conveyor shaft through a coupling. The rotational speed of the conveyor shaft is 5-10 m / d.

[0014] Preferably, a desalination shovel is fixedly connected to the top of one end of the water tank, and one end of the desalination shovel is slidably inserted into the opposite surface of the absorbent cloth. A salt discharge port is opened on one side surface of the greenhouse cover, and a salt storage tank is fixedly connected to one side surface of the water tank. The salt inlet of the salt storage tank corresponds to the salt outlet of the salt discharge port.

[0015] Preferably, a fan mounting plate is fixedly connected to one side surface of the water tank, and a blower is fixedly connected to the top of the fan mounting plate. The blower has a ventilation capacity of 5000 m³ / h. 3 / H, the air inlet of the blower is fixedly connected to a first connecting pipe, one end of the first connecting pipe is fixedly connected to an air intake pipe, one end of the air intake pipe is fixedly connected to a first sealing head, and the air intake pipe has air inlets of increasing size sequentially from the first sealing head to the connection end of the first connecting pipe, and the air intake pipe is located inside the greenhouse cover.

[0016] Preferably, one end of each of the plurality of condensing heating tubes near the blower is fixedly connected to a second connecting tube, one end of each of the plurality of second connecting tubes is fixedly connected to a first U-shaped connecting tube, one end of the first U-shaped connecting tube is fixedly connected to a second sealing head, and the other end of the first U-shaped connecting tube is fixedly connected to the air outlet of the blower.

[0017] Preferably, the other end of each of the plurality of condensing heating tubes is fixedly connected to a third connecting tube, one end of each of the plurality of third connecting tubes is fixedly connected to a second U-shaped connecting tube, one end of the second U-shaped connecting tube is fixedly connected to a valve, and the other end of the second U-shaped connecting tube is fixedly connected to a fourth connecting tube.

[0018] Preferably, one end of the exhaust pipe is fixedly connected to a third sealing head, the other end of the exhaust pipe is fixedly connected to a fifth connecting pipe, one end of each of the plurality of fifth connecting pipes is fixedly connected to a sixth connecting pipe, one end of the sixth connecting pipe is fixedly connected to a fourth sealing head, and the other end of the sixth connecting pipe is fixedly connected to one end of the fourth connecting pipe.

[0019] Preferably, the exhaust pipe has exhaust holes of increasing size sequentially from the third sealing head to the connection end of the fifth connecting pipe. The surfaces of the condenser heating pipe, the intake pipe, and the exhaust pipe are all mirror-finished. The materials of the condenser heating pipe, the intake pipe, and the exhaust pipe are all SS316L.

[0020] The beneficial effects of this invention are as follows:

[0021] This invention relates to a mobile evaporation tank for radioactive wastewater, achieving sealed control of the evaporation tank and eliminating its influence from the external environment. Simultaneously, it employs a forced gas-liquid convection device, effectively increasing the evaporation temperature, reducing air humidity, and accelerating the evaporation process. Furthermore, it utilizes membrane technology, leveraging the membrane's enormous surface area to increase the evaporation surface area several times over. This results in a treatment capacity dozens of times greater than traditional evaporation tanks, and its application is unaffected by the region of use, making it a universally applicable and highly efficient tool for treating radionuclide wastewater. It has extremely broad application potential in the decommissioning of old evaporation tanks, the construction of new evaporation tanks, and the treatment of nuclear industry wastewater in different regions. Attached Figure Description

[0022] Figure 1 A schematic diagram of a mobile evaporation tank for radioactive wastewater;

[0023] Figure 2 A three-dimensional diagram of the absorbent cloth structure of a mobile evaporation tank for radioactive wastewater;

[0024] Figure 3 A mobile evaporation tank for radioactive wastewater Figure 2 Enlarged view of point A in the middle;

[0025] Figure 4 An exploded view of a mobile evaporation tank for radioactive wastewater.

[0026] Figure 5 A three-dimensional view of the suction pipe structure of a mobile evaporation tank for radioactive wastewater;

[0027] Figure 6 A mobile evaporation tank for radioactive wastewater Figure 4 Enlarged view of section B in the middle.

[0028] In the diagram: 1. Water tank; 2. Greenhouse cover; 3. Exhaust pipe; 4. Condensation heating pipe; 5. Conveyor shaft; 6. Absorbent cloth; 7. L-shaped bearing seat; 8. Drive motor; 9. Desalination shovel; 10. Salt discharge port; 11. Salt storage tank; 12. Fan mounting plate; 13. Blower; 14. First connecting pipe; 15. Suction pipe; 16. First sealing head; 17. Air inlet; 18. Second connecting pipe; 19. First U-shaped connecting pipe; 20. Second sealing head; 21. Third connecting pipe; 22. Second U-shaped connecting pipe; 23. Valve; 24. Fourth connecting pipe; 25. Third sealing head; 26. Fifth connecting pipe; 27. Sixth connecting pipe; 28. Fourth sealing head; 29. ​​Exhaust port. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0030] Reference Figure 1-6A mobile evaporation tank for radioactive wastewater includes a water tank 1. A greenhouse cover 2 is fixedly installed on the top of the water tank 1. The greenhouse cover 2 is a heat-insulating and light-transmitting material composed of light-transmitting and UV-resistant materials, preferably inorganic glass, plexiglass, or transparent plastic films such as PI, PP, and PBI. An internal circulation device is set inside the water tank 1, which includes an exhaust pipe 3 and condenser heating pipes 4. The water tank 1 contains waste liquid to be treated. The water level of the waste liquid to be treated in the water tank 1 is selected to be 700mm-1000mm. Multiple condenser heating pipes 4 are located inside the waste liquid to be treated. Furthermore, the outside of the condenser heating pipes 4 is immersed in the waste liquid to be treated. This achieves the condensation of warm air inside the condenser heating pipes 4, the outflow of pure water, and the external heating of the salt tank, thereby raising the tank temperature.

[0031] Multiple exhaust pipes 3 and multiple condenser heating pipes 4 are distributed vertically inside the water tank 1. The multiple exhaust pipes 3 are located above the multiple condenser heating pipes 4. Both ends of the multiple exhaust pipes 3 and the multiple condenser heating pipes 4 penetrate and extend to the outer surfaces of both sides of the water tank 1. The surfaces of the multiple exhaust pipes 3 and the multiple condenser heating pipes 4 are wrapped with absorbent cloth 6. The surface of the absorbent cloth is connected to the surface of the conveyor shaft 5. The absorbent cloth 6 is woven from radiation-resistant and UV-resistant absorbent material. Preferably, the radiation-resistant and UV-resistant absorbent material is woven from radiation-resistant PP non-woven fabric, activated carbon, carbon fiber, cellulose, etc., which further achieves high water absorption capacity, increases the surface area, and accelerates the evaporation rate.

[0032] A fan mounting plate 12 is fixedly connected to one side surface of the water tank 1, and a blower 13 is fixedly connected to the top of the fan mounting plate 12. The ventilation volume of the blower 13 is 5000m³. 3 / H, the air inlet of the blower 13 is fixedly connected to the first connecting pipe 14, one end of the first connecting pipe 14 is fixedly connected to the suction pipe 15, one end of the suction pipe 15 is fixedly connected to the first sealing head 16, and the suction pipe 15 has air inlets 17 of increasing size from the first sealing head 16 to the connection end of the first connecting pipe 14. The suction pipe 15 is located inside the greenhouse cover 2, which further achieves the effect of the blower 13 working to draw the gas drawn in the suction pipe 15 and perform circulation operation.

[0033] One end of each of the multiple condensing heating tubes 4 near the blower 13 is fixedly connected to a second connecting tube 18, and one end of each of the multiple second connecting tubes 18 is fixedly connected to a first U-shaped connecting tube 19. One end of the first U-shaped connecting tube 19 is fixedly connected to a second sealing head 20, and the other end of the first U-shaped connecting tube 19 is fixedly connected to the air outlet of the blower 13. This further achieves the effect of using the blower 13 to discharge the extracted gas into the condensing heating tubes 4.

[0034] The other ends of multiple condensing heating tubes 4 are all fixedly connected to a third connecting tube 21. One end of each of the multiple third connecting tubes 21 is fixedly connected to a second U-shaped connecting tube 22. One end of the second U-shaped connecting tube 22 is fixedly connected to a valve 23. The other end of the second U-shaped connecting tube 22 is fixedly connected to a fourth connecting tube 24. Furthermore, the gas internal circulation setting improves the gas flow on the evaporation surface and increases the vapor pressure difference, thereby accelerating the evaporation rate. The sealed chamber and the design of the condensing heating tubes 4 increase the temperature of the evaporation pool and accelerate the evaporation rate.

[0035] One end of the exhaust pipe 3 is fixedly connected to a third sealing head 25, and the other end of the exhaust pipe 3 is fixedly connected to a fifth connecting pipe 26. One end of each of the multiple fifth connecting pipes 26 is fixedly connected to a sixth connecting pipe 27. One end of the sixth connecting pipe 27 is fixedly connected to a fourth sealing head 28, and the other end of the sixth connecting pipe 27 is fixedly connected to one end of the fourth connecting pipe 24. Furthermore, this achieves the goal of sealing one end of multiple exhaust pipes 3 and connecting the other end of the exhaust pipe 26 with the fifth connecting pipe 26, so that the fifth connecting pipe 26 connects to the sixth connecting pipe 27. By controlling the connection between the sixth connecting pipe 27 and the fourth connecting pipe 24, the condensing heating pipe 4 is connected to the exhaust pipe 3 for circulation operation.

[0036] The exhaust pipe 3 has exhaust holes 29 of increasing size sequentially opened from the third sealing head 25 to the connection end of the fifth connecting pipe 26. The greenhouse cover 2 is made of SS316L as a support frame, and the surface of the support frame is covered with a light-transmitting material. The preferred light-transmitting material is transparent plastic film such as inorganic glass, plexiglass, PI, PP, and PBI. The surfaces of the condenser heating pipe 4, the air intake pipe 15, and the exhaust pipe 3 are all mirror-finished. The materials of the condenser heating pipe 4, the air intake pipe 15, and the exhaust pipe 3 are all SS316L. This further achieves the effect of the gas inside the exhaust pipe 3 being discharged through the exhaust holes 29. The mirror finish prevents the water-absorbing cloth 6 from being scratched and damaged during transmission. The material selection also prevents rust and corrosion.

[0037] An automatic conveying and desalination mechanism is installed above the water tank 1. The automatic conveying and desalination mechanism includes a conveying shaft 5, with both ends of the conveying shaft 5 penetrating and extending to the outer surfaces of both sides of the greenhouse cover 2. The water tank 1 is made of corrosion-resistant, radiation-resistant materials, preferably PVDF, carbon fiber, stainless steel, or a combination of multiple materials. L-shaped bearing seats 7 are fixedly connected to both sides of the top of the water tank 1. The opposing surfaces of the two L-shaped bearing seats 7 are fixedly connected to both ends of the conveying shaft 5 through bearings. A drive motor 8 is fixedly connected to one side of one of the L-shaped bearing seats 7. The output shaft of the drive motor 8 is fixedly connected to one end of the conveying shaft 5 through a coupling. The rotation speed of the conveying shaft 5 is 5-10 m / d. This achieves the effect of the water-absorbing cloth 6 being transported by the drive motor 8 driving the conveying shaft 5 to rotate, thereby driving the water-absorbing cloth 6 to be transported. The conveying shaft 5 is supported and installed by the L-shaped bearing seats 7 on both sides of the water tank 1.

[0038] A desalination shovel 9 is fixedly connected to the top of one end of the water tank 1. The surface of one end of the desalination shovel 9 is slidably inserted into the opposite surface of the absorbent cloth 6. A salt discharge port 10 is opened on one side surface of the greenhouse cover 2. A salt storage tank 11 is fixedly connected to one side surface of the water tank 1. The salt inlet of the salt storage tank 11 corresponds to the salt outlet of the salt discharge port 10. Furthermore, the salt attached to the surface of the absorbent cloth 6 is desalinated by contacting the desalination shovel 9 through the movement of the absorbent cloth 6. The removed salt falls into the interior of the salt storage tank 11 through the salt discharge port 10 for storage. The timely separation of brine causes the liquid concentration of the evaporation tank to decrease continuously, which also allows the evaporation rate to increase continuously.

[0039] This invention relates to a mobile evaporation tank for radioactive wastewater, achieving sealed control of the evaporation tank and eliminating its influence from the external environment. Simultaneously, it employs a forced gas-liquid convection device, effectively increasing the evaporation temperature, reducing air humidity, and accelerating the evaporation process. Furthermore, it utilizes membrane technology, leveraging the membrane's enormous surface area to increase the evaporation surface area several times over. This results in a treatment capacity dozens of times greater than traditional evaporation tanks, and its application is unaffected by the region of use, making it a universally applicable and highly efficient tool for treating radionuclide wastewater. It has extremely broad application potential in the decommissioning of old evaporation tanks, the construction of new evaporation tanks, and the treatment of nuclear industry wastewater in different regions.

[0040] Working principle: The blower 13 operates, drawing air through its inlet, which in turn draws air through the suction pipe 15, drawing the air from inside the greenhouse cover 2 through the air inlet 17. The air is then forced into the condenser heating pipe 4 by the blower 13. The outside of the condenser heating pipe 4 is immersed in the waste liquid to be treated, thus achieving condensation inside the condenser heating pipe 4, with pure water flowing out, while the outside heats the salt tank, raising the tank temperature. When the surface of the absorbent cloth 6 is dry and the salt has crystallized, the conveyor shaft 5 is controlled to rotate to collect the salt from the absorbent cloth 6. At the same time, the absorbed absorbent cloth 6 is re-absorbed with crystallized salt, and then kept still again.

[0041] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A mobile evaporation tank for radioactive wastewater, comprising a water tank (1), characterized in that: A greenhouse cover (2) is fixedly installed on the top of the water tank (1). An internal circulation device is provided inside the water tank (1). The internal circulation device includes an exhaust pipe (3) and a condensation heating pipe (4). Multiple exhaust pipes (3) and multiple condensation heating pipes (4) are distributed vertically inside the water tank (1). Multiple exhaust pipes (3) are located above multiple condensation heating pipes (4). Both ends of multiple exhaust pipes (3) and both ends of multiple condensation heating pipes (4) penetrate and extend to the outer surfaces of both sides of the water tank (1). An automatic conveying desalination mechanism is provided above the water tank (1). The automatic conveying desalination mechanism includes a conveying shaft (5). Both ends of the conveying shaft (5) pass through and extend to the outer surfaces of both sides of the greenhouse cover (2). The surfaces of the plurality of exhaust pipes (3) and the surfaces of the plurality of condensing heating pipes (4) are all wrapped with absorbent cloth (6), and the surface of the absorbent cloth (6) is connected to the surface of the conveying shaft (5) in a driving connection. A fan mounting plate (12) is fixedly connected to one side surface of the water tank (1), a blower (13) is fixedly connected to the top of the fan mounting plate (12), a first connecting pipe (14) is fixedly connected to the air inlet of the blower (13), an air intake pipe (15) is fixedly connected to one end of the first connecting pipe (14), a first sealing head (16) is fixedly connected to one end of the air intake pipe (15), and air intake holes (17) of increasing size are opened sequentially from the first sealing head (16) to the connection end of the first connecting pipe (14) of the air intake pipe (15). The air intake pipe (15) is located inside the greenhouse cover (2). One end of each of the plurality of condensing heating tubes (4) near the blower (13) is fixedly connected to a second connecting tube (18), and one end of each of the plurality of second connecting tubes (18) is fixedly connected to a first U-shaped connecting tube (19). One end of the first U-shaped connecting tube (19) is fixedly connected to a second sealing head (20), and the other end of the first U-shaped connecting tube (19) is fixedly connected to the air outlet of the blower (13). The other end of each of the plurality of condensing heating tubes (4) is fixedly connected to a third connecting tube (21), one end of each of the plurality of third connecting tubes (21) is fixedly connected to a second U-shaped connecting tube (22), one end of the second U-shaped connecting tube (22) is fixedly connected to a valve (23), and the other end of the second U-shaped connecting tube (22) is fixedly connected to a fourth connecting tube (24). One end of the exhaust pipe (3) is fixedly connected to a third sealing head (25), and the other end of the exhaust pipe (3) is fixedly connected to a fifth connecting pipe (26). One end of each of the fifth connecting pipes (26) is fixedly connected to a sixth connecting pipe (27). One end of the sixth connecting pipe (27) is fixedly connected to a fourth sealing head (28), and the other end of the sixth connecting pipe (27) is fixedly connected to one end of the fourth connecting pipe (24).

2. The mobile evaporation tank for radioactive wastewater according to claim 1, characterized in that: The water tank (1) contains waste liquid to be treated. The water level of the waste liquid to be treated in the water tank (1) is 700mm-1000mm. Multiple condensing heating tubes (4) are located inside the waste liquid to be treated.

3. The mobile evaporation tank for radioactive wastewater according to claim 1, characterized in that: The absorbent cloth (6) is woven from a radiation-resistant and UV-resistant absorbent material.

4. The mobile evaporation tank for radioactive wastewater according to claim 1, characterized in that: The top two sides of the water tank (1) are fixedly connected with L-shaped bearing seats (7). The opposite surfaces of the two L-shaped bearing seats (7) are fixedly connected to the two ends of the conveying shaft (5) through bearings. One side surface of one of the L-shaped bearing seats (7) is fixedly connected with a drive motor (8). The output shaft of the drive motor (8) is fixedly connected to one end of the conveying shaft (5) through a coupling.

5. A mobile evaporation tank for radioactive wastewater according to claim 1, characterized in that: A desalination shovel (9) is fixedly connected to the top of one end of the water tank (1). The surface of one end of the desalination shovel (9) is slidably inserted into the opposite surface of the absorbent cloth (6). A salt discharge port (10) is opened on one side surface of the greenhouse cover (2). A salt storage box (11) is fixedly connected to one side surface of the water tank (1). The salt inlet of the salt storage box (11) corresponds to the salt outlet of the salt discharge port (10).

6. A mobile evaporation tank for radioactive wastewater according to claim 1, characterized in that: The ventilation volume of the blower (13) is 5000m³. 3 / h.

7. A mobile evaporation tank for radioactive wastewater according to claim 1, characterized in that: The exhaust pipe (3) has exhaust holes (29) of increasing size opened sequentially from the third sealing head (25) to the connection end of the fifth connecting pipe (26). The greenhouse cover (2) is made of SS316L to form a support frame. The surface of the support frame is covered with a light-transmitting material. The surfaces of the condensing heating pipe (4), the suction pipe (15), and the exhaust pipe (3) are all mirror-finished. The materials of the condensing heating pipe (4), the suction pipe (15), and the exhaust pipe (3) are all SS316L.

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