A modular radioactive wastewater evaporation treatment device and method

Abstract

A modular radioactive wastewater evaporation treatment device includes an evaporation module and a compression heat exchange module. The compression heat exchange module includes a steam compressor and a heat exchanger. The evaporation module includes a tank for the solution to be treated, a tank for clean water, and at least one evaporation unit. Each evaporation unit includes an inner rotating tank and an outer sealed tank fitted outside the inner rotating tank. A sandwich structure is formed between the inner rotating tank and the outer sealed tank. The inner rotating tank and the outer sealed tank are rotatably connected, and the inner rotating tank is horizontally positioned. The tank for the solution to be treated is connected to the interior of the inner rotating tank through the cold fluid side of the heat exchanger. The inner rotating tank is connected to the inlet end of the steam compressor through a first steam pipe. The outlet end of the steam compressor is connected to the sandwich structure through a second steam pipe. The sandwich structure is connected to the tank for clean water through the hot fluid side of the heat exchanger. The modular design of this invention makes the wastewater evaporation treatment device highly flexible and scalable, while also simplifying manufacturing and maintenance.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a modular radioactive wastewater evaporation treatment device and method. Background Technology

[0002] The most commonly used method for treating radioactive wastewater is evaporation concentration. The basic principle of evaporation concentration for treating radioactive wastewater is as follows: the wastewater entering the evaporator is heated to boiling by steam or an electric heater. The water in the wastewater gradually evaporates into water vapor, which is then cooled and condensed into water. Most of the radionuclides in the wastewater are not volatile, and only a few nuclides are carried into the steam by tiny droplets. Most of the radionuclides remain in the evaporation residue, thus achieving the concentration and separation of nuclides in the wastewater.

[0003] However, it consumes a lot of heat energy, is prone to scaling, and requires regular maintenance, which increases operating costs. Furthermore, it requires customized design for different application scenarios, and the complexity of the evaporation and concentration device leads to a long customization cycle. These are all issues that existing technologies need further improvement and resolution. Summary of the Invention

[0004] One of the objectives of this invention is to provide a modular radioactive wastewater evaporation treatment device to solve the problems of poor application flexibility, high maintenance costs, and easy scaling of existing radioactive wastewater evaporation treatment devices.

[0005] The second objective of this invention is to provide a modular radioactive wastewater evaporation treatment method to solve the problems of poor application flexibility, high operating costs, and easy scaling of existing radioactive wastewater evaporation treatment devices.

[0006] To solve the above problems, one of the objectives of this invention is achieved as follows:

[0007] A modular radioactive wastewater evaporation treatment device includes an evaporation module and a compression heat exchange module. The compression heat exchange module includes a steam compressor and a heat exchanger, which includes a hot fluid side and a cold fluid side, through which a high-temperature fluid on the hot fluid side and a low-temperature fluid on the cold fluid side transfer heat. The evaporation module includes a tank for temporarily storing the wastewater to be treated, a clear water tank for collecting condensate, and at least one evaporation unit. Each evaporation unit includes an inner rotating tank and an outer sealed tank fitted outside the inner rotating tank. An interlayer is formed between the inner rotating tank and the outer sealed tank. The inner rotating tank and the outer sealed tank are rotatably connected, and the inner rotating tank is horizontally positioned.

[0008] The solution tank to be treated is connected to the interior of the inner rotating tank through the cold fluid side of the heat exchanger. The inner rotating tank is connected to the inlet end of the steam compressor through the first steam pipeline. The outlet end of the steam compressor is connected to the jacket through the second steam pipeline. The jacket is connected to the clear water tank through the hot fluid side of the heat exchanger.

[0009] The inner rotating tank is equipped with a cleaning device to prevent deposits from accumulating inside the inner rotating tank, and the cleaning device is stationary relative to the outer sealed tank.

[0010] The cleaning device includes a support rod disposed in the lower part of the inner rotating tank, the axis of the support rod being parallel to the axis of the inner rotating tank, the support rod being fixedly connected to the outer sealed tank, and a cleaning part being disposed on the support rod;

[0011] The cleaning unit includes multiple scrapers arranged axially along the support rod; or

[0012] The cleaning unit includes spiral blades that are spirally wound around the support rod.

[0013] When the cleaning unit includes multiple scrapers, the scrapers are arranged vertically, and the included angle between the scraper and the corresponding support rod is greater than 0° and less than 90°.

[0014] The modular radioactive wastewater evaporation treatment device also includes a main frame, on which all the evaporation units are centrally located.

[0015] The outer sealing tank is fixedly mounted on the main frame.

[0016] The inner rotating tank has a rotating shaft fixedly installed at one end of its axial direction. The rotating shaft is connected to a driving component, which drives the inner rotating tank to rotate.

[0017] The second objective of this invention is achieved as follows:

[0018] A modular radioactive wastewater evaporation treatment method, using the aforementioned modular radioactive wastewater evaporation treatment device, includes the following steps:

[0019] Step a: Determine the number of evaporation units based on the amount of radioactive wastewater to be treated, and connect and assemble the evaporation units with the steam compressor, the heat exchanger, the tank of the solution to be treated, and the clear water tank;

[0020] Step b: The radioactive wastewater is temporarily stored in the solution tank to be treated. When treatment is required, the wastewater to be treated in the solution tank is input into the heat exchanger for preheating. The preheated wastewater to be treated is then transported into the inner rotating tank, causing the inner rotating tank to rotate. Under the action of the rotation of the inner rotating tank, a liquid film is formed on the inner wall surface of the inner rotating tank. The water in the liquid film is heated and evaporated into steam under the action of the heat source in the jacket.

[0021] In steps c and b, the steam in the inner rotating tank enters the steam compressor for compression and heating. As heating steam, it enters the jacket to heat the liquid film in the inner rotating tank. After heat exchange with the liquid film in the inner rotating tank, the heating steam condenses into condensate.

[0022] The condensate from steps d and c is fed into the heat exchanger, where it exchanges heat with the wastewater to be heated before entering the clean water tank.

[0023] Step e, repeat step cd until the wastewater in the inner rotating tank is concentrated to the target concentration, then the concentrate is further processed to complete the evaporation and concentration of the wastewater.

[0024] The inner rotating tank is equipped with a cleaning device to prevent deposits from forming inside the inner rotating tank, and the cleaning device is stationary relative to the outer sealed tank.

[0025] In steps b and c, as the inner rotating tank rotates, the sediment on the inner wall surface of the inner rotating tank rotates with the inner rotating tank. When passing through the cleaning device, it is agitated by the cleaning device to prevent the sediment from adhering to the inner wall surface of the inner rotating tank.

[0026] In step e, the specific method for further processing the concentrate is as follows: one or more concentrate tanks are set up, and the concentrate in the inner rotating tank is pumped into the concentrate tank.

[0027] The beneficial effects of this invention are:

[0028] The modular radioactive wastewater evaporation treatment device of the present invention includes at least one independent evaporation unit, with multiple independent evaporation units integrated within the evaporation module. Each evaporation unit includes an inner rotating tank and a sealed outer tank. This design makes the wastewater evaporation treatment device highly flexible and scalable, allowing for the addition or reduction of the number of evaporation units according to the required treatment volume. It also enables the addition or reduction of evaporation units within the evaporation module to meet different scenario requirements, shortening the customization cycle and simplifying manufacturing and maintenance.

[0029] This invention combines a rotating inner tank with a jacket. The jacket contains a heat source for heating the wastewater in the inner tank. The inner circumferential wall of the inner tank forms a heating surface. The inner tank is made of a corrosion-resistant, high thermal conductivity material; in this embodiment, it is made of stainless steel. This material forms a liquid film and accelerates the evaporation of solvents in the wastewater. Operators can optimize evaporation efficiency by controlling the rotation speed and heating temperature of the inner tank, achieving rapid separation of solvents from the wastewater to obtain optimal evaporation efficiency and product quality. Attached Figure Description

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0031] Figure 1 This is a schematic diagram of the structure of the present invention;

[0032] Figure 2 This is an external view of the evaporation unit of the present invention;

[0033] Figure 3 This is a schematic diagram of the evaporation unit of the present invention;

[0034] Figure 4 This is a partial structural diagram of the evaporation unit of the present invention;

[0035] Figure 5 This is a schematic diagram of the evaporation module of the present invention.

[0036] Explanation of reference numerals in the attached figures

[0037] 1. Evaporation module; 11. Tank for solution to be processed; 111. Compressed air inlet pipe; 112. Upper exhaust pipe; 12. Clean water tank; 13. Evaporation unit; 131. Inner rotating tank; 1311. Outer connecting cylinder; 132. Outer sealed tank; 1321. Inner connecting cylinder; 1322. Inner baffle; 1323. Outer baffle; 133. Jacket; 134. Drive unit; 21. Steam compressor; 22. Heat exchanger; 3. Cleaning device; 31. Support rod; 32. Scraper; 4. Main frame; 51. First steam pipeline; 52. Second steam pipeline; 61. Air inlet pipe; 62. Liquid outlet pipe; 71. Liquid inlet pipe; 72. Concentrate discharge pipe; 73. Exhaust pipe; 8. Concentrate tank; 91. Sedimentation tank; 92. Decay tank one; 93. Decay tank two; 94. Decay tank three. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0039] Example 1:

[0040] like Figures 1-5 As shown, a modular radioactive wastewater evaporation treatment device of the present invention includes an evaporation module 1 and a compression heat exchange module. The compression heat exchange module includes a steam compressor 21 and a heat exchanger 22. The heat exchanger 22 includes a hot fluid side and a cold fluid side, and heat is transferred between the high-temperature fluid on the hot fluid side and the low-temperature fluid on the cold fluid side. The evaporation module 1 includes a solution tank 11 for temporarily storing the wastewater to be treated, a clear water tank 12 for collecting condensate, and at least one evaporation unit 13. Each evaporation unit 13 includes an inner rotating tank 131 and an outer sealed tank 132 sleeved outside the inner rotating tank 131. An interlayer 133 is formed between the inner rotating tank 131 and the outer sealed tank 132. The inner rotating tank 131 and the outer sealed tank 132 are rotatably connected, and the inner rotating tank 131 is horizontally arranged.

[0041] The solution tank 11 is connected to the interior of the inner rotating tank 131 through the cold fluid side of the heat exchanger 22. The inner rotating tank 131 is connected to the inlet end of the steam compressor 21 through the first steam pipe 51. The outlet end of the steam compressor 21 is connected to the jacket 133 through the second steam pipe 52. The jacket 133 is connected to the clean water tank 12 through the hot fluid side of the heat exchanger 22.

[0042] The modular radioactive wastewater evaporation treatment device of the present invention includes at least one independent evaporation unit 13, and multiple independent evaporation units 13 are integrated in the evaporation module 1. Each evaporation unit 13 includes an inner rotating tank 131 and a sealed outer tank 132. This design makes the wastewater evaporation treatment device highly flexible and scalable, allowing the number of evaporation units 13 to be increased or decreased according to the treatment volume requirements. It also allows for the addition or reduction of evaporation units 13 in the evaporation module 1 according to different scenario requirements, shortening the customization cycle and simplifying manufacturing and maintenance.

[0043] This invention utilizes a combination of a rotating inner tank 131 and a jacket 133. The jacket 133 contains a heat source for heating the wastewater in the inner tank 131. The inner peripheral wall of the inner tank 131 forms a heating surface. The inner tank 131 is made of a corrosion-resistant, high thermal conductivity material; in this embodiment, it is made of stainless steel. This material forms a liquid film and accelerates the evaporation of solvents in the wastewater. Operators can optimize the evaporation efficiency by controlling the rotation speed and heating temperature of the inner tank 131, achieving rapid separation of solvents from the wastewater to obtain optimal evaporation efficiency and product quality.

[0044] like Figure 3 As shown, in order to facilitate processing and installation, and to make it easy to form a heating surface on the inner wall of the inner rotating tank 131, the inner rotating tank 131 has a horizontally arranged cylindrical tank structure, the central axis of the inner rotating tank 131 is horizontally arranged, and the outer sealing tank 132 is coaxially sleeved on the outside of the inner rotating tank 131.

[0045] A rotating shaft is fixedly installed at one axial end of the inner rotating tank 131. The rotating shaft is connected to the output end of the drive component 134, which drives the inner rotating tank 131 to rotate. In this embodiment, the drive component 134 is a motor, and the output shaft of the motor is fixedly connected to the rotating shaft of the inner rotating tank 131 to drive the inner rotating tank 131 to rotate. The inner rotating tank 131 rotates around its central axis. The rotating shaft of the inner rotating tank 131 is rotatably connected to the corresponding end of the outer sealing tank 132 through a bearing, so that the inner rotating tank 131 rotates while the outer sealing tank 132 remains stationary. A through hole is coaxially opened at the other axial end of the inner rotating tank 131, and an outer connecting cylinder 1311 is coaxially fixedly connected to this through hole. The outer diameter of the outer connecting cylinder 1311 is smaller than the outer diameter of the inner rotating tank 131. The corresponding end of the outer connecting cylinder 1311 and the inner rotating tank 131 form a stepped shape, which facilitates the rotatable connection between the outer connecting cylinder 131 and the outer sealing tank 132 while also providing a seal at the junction of the two.

[0046] like Figure 3 , Figure 4 As shown, an inner connecting cylinder 1321 is coaxially and fixedly inserted through one end of the outer sealing tank 132 corresponding to the outer connecting cylinder 1311. One axial end of the inner connecting cylinder 1321 extends into the inner rotating tank 131 and is coaxially and fixedly connected to an inner baffle 1322. The inner circumferential surface of the outer connecting cylinder 1311 is rotatably connected to the outer circumferential surface of the inner connecting cylinder 1321 via a bearing. To increase the sealing performance at the junction of the through hole of the inner rotating tank 131 and the inner connecting cylinder 1321, the inner baffle 1322 has an annular plate structure, and the outer diameter of the inner baffle 1322 is larger than the diameter of the through hole at the connecting end of the outer connecting cylinder 1311 of the inner rotating tank 131. The other axial end of the inner connecting cylinder 1321 is coaxially and fixedly connected to an annular outer baffle 1323.

[0047] Evaporation unit 13 includes a pipe connection section located at the end of the evaporation unit opposite to the drive member 134. The pipe connection section includes an air inlet pipe 61 connected to the upper part of the corresponding end of the jacket 133, a liquid outlet pipe 62 connected to the bottom of the jacket 133, and a liquid inlet pipe 71 and a concentrate discharge pipe 72 connected to the inner rotating tank 131. The liquid inlet pipe 71 and the concentrate discharge pipe 72 are both inserted through the inner connecting cylinder 1321 and connected to the outside. The concentrate discharge pipe 72 extends inside the inner rotating tank 131 to a point close to the drive member. At the installation end, gaps are provided between the inner circumferential surface of the inner baffle and the inlet pipe 71 and the concentrate outlet pipe 72. The outer baffle 1323 is a ring-shaped structure, with its inner circumferential surface flush with the inner circumferential surface of the inner connecting cylinder 1321. A flange sealing plate is provided at the end of the outer baffle 1323 away from the inner connecting cylinder 1321. The flange sealing plate only has through openings for the inlet pipe 71 and the concentrate outlet pipe 72, facilitating the discharge of steam through the gaps and through the exhaust pipe 73. The pipeline connection also includes an exhaust pipe 73 connected to the lower part of the inner connecting cylinder 1321. The exhaust pipe 73 at the lower part of the inner connecting cylinder 1321 is connected to the first steam pipeline 51, and is used to sequentially guide the steam in the inner rotating tank 131 through the exhaust pipe 73 and the first steam pipeline 51 into the inlet end of the steam compressor 21. The second steam pipeline 52 is connected to the air inlet pipe 61 of the interlayer 133, and is used to transport the high-temperature and high-pressure steam compressed by the steam compressor 21 into the interlayer 133 through the second steam pipeline 52 and the air inlet pipe 61. In this embodiment, a float valve is installed on the section of the liquid inlet pipe 71 located in the inner rotating tank 131, and the amount of wastewater to be treated is controlled by the position of the float of the float valve.

[0048] In this embodiment, to prevent the formation of difficult-to-remove deposits on the heating surface, a cleaning device 3 is provided inside the inner rotating tank 131 to prevent deposits from accumulating there. The cleaning device 3 is stationary relative to the outer sealed tank 132. This cleaning device 3 operates inside the inner rotating tank 131, continuously removing deposits from the heating surface and maintaining efficient equipment operation. Since deposits in wastewater tend to accumulate in the lower part of the inner rotating tank 131, placing the cleaning device 3 in the lower part enhances its agitation effect, preventing deposits from settling there. Furthermore, its placement in the lower part ensures cleaning occurs below the solution, preventing deposits from being carried into the steam and ensuring a clean and efficient evaporation process.

[0049] The cleaning device 3 includes a support rod 31 disposed in the lower part of the inner rotating tank 131. The axial direction of the support rod 31 is parallel to the axial direction of the inner rotating tank 131, and the support rod 31 is fixedly connected to the outer sealed tank 132. One end of the support rod 31 is a free end and close to the drive member 134, while the other end is fixedly connected to the inner baffle 1322. Since the inner connecting cylinder 1321 is fixedly connected to the outer sealed tank 132, the other end of the support rod 31 is indirectly fixedly connected to the outer sealed tank 132. A cleaning part is provided on the support rod 31. The cleaning part includes multiple scrapers 32 arranged along the axial direction of the support rod 31; or the cleaning part includes spiral blades wound around the support rod 31 in a spiral shape. Either of the above two structures of the cleaning part can be used. In this embodiment, the cleaning unit uses a structure comprising multiple scrapers 32 arranged axially along the support rod 31. In this embodiment, the multiple scrapers 32 are evenly arranged axially along the support rod 31, and the scrapers 32 are fixedly mounted on the support rod 31. The function of the scrapers 32 is as follows: When the waste liquid is carried by the inner rotating tank 131 through the scrapers 32, the impurities in the waste liquid are agitated by the scrapers 32 and dispersed throughout the inner rotating tank 131 under the combined action of the scrapers 32's agitation and the rotation of the inner rotating tank 131, thus preventing impurities from settling at the bottom of the inner rotating tank 131. Furthermore, even if there are deposits at the bottom of the inner rotating tank 131, they are carried to the scrapers 32 during the rotation of the inner rotating tank 131, where the scrapers 32 can break up large deposits and disperse them into the waste liquid with the water flow.

[0050] When the cleaning unit includes multiple scrapers 32, the scrapers 32 are vertically arranged, and the included angle between the scraper 32 and the corresponding support rod 31 is greater than 0° and less than 90°. That is, the scraper 32 can simultaneously generate a thrust perpendicular to the axis of the inner rotating tank 131 and a thrust parallel to the axis of the inner rotating tank 131 on the water flow, and can push the water flow in multiple directions, thereby enhancing the disturbance effect of the scraper 32 on the water flow.

[0051] Among them, such as Figure 5 As shown, the modular radioactive wastewater evaporation treatment device also includes a main frame 4, on which evaporation units 13 are all centrally located. An outer sealed tank 132 is fixedly mounted on the main frame 4, and the fixing part of the driving component 134 is also fixedly mounted on the main frame 4. The main frame 4 can be divided into multiple layers from top to bottom, with each layer capable of housing multiple evaporation units 13. In this invention, multiple evaporation units 13 can be centrally installed on the main frame 4. Different numbers of evaporation units 13 can be selected according to the wastewater treatment needs. When customizing, only the number of evaporation units 13 needs to be adjusted, reducing the difficulty of custom design and shortening the customization cycle.

[0052] In this embodiment, the main frame 4 includes a rectangular or cubic frame and multiple sets of support rod assemblies. These support rod assemblies are evenly arranged vertically within the frame, and each set includes multiple support rods at the same height. When installing the evaporation unit 13, it is mounted on the corresponding support rod assembly. Furthermore, multiple evaporation units 13 are arranged parallel to each other on the main frame 4. The pipe connections of all evaporation units 13 are located on the same side of the main frame 4, while the drive components 134 of all evaporation units 13 are located on the other side of the main frame 4, resulting in a more aesthetically pleasing overall arrangement.

[0053] Example 2

[0054] Generally, radioactive wastewater is stored sequentially through sedimentation tank 91, decay tank one 92, decay tank two 93, and decay tank three 94, which can reduce the radioactivity level of the wastewater. However, when the output exceeds the decay, the space in decay tank three is insufficient to store more radioactive solution. In this case, the modular radioactive wastewater evaporation treatment device of Example 1 is required for treatment, forming a modular radioactive wastewater evaporation treatment method to evaporate and concentrate the radioactive wastewater, reducing the storage space requirements for radioactive water.

[0055] like Figures 1-5 As shown, a modular radioactive wastewater evaporation treatment method of the present invention, using a modular radioactive wastewater evaporation treatment device according to Embodiment 1, includes the following steps:

[0056] Step a: Determine the number of evaporation units 13 based on the volume of radioactive wastewater to be treated, and install all evaporation units 13 on the main frame 4. Connect and assemble the evaporation units 13 with the steam compressor 21, heat exchanger 22, solution tank 11, and clean water tank 12. In this embodiment, the steam compressor 21 can be a Roots steam compressor.

[0057] Step b: The radioactive wastewater is temporarily stored in the solution tank 11. When treatment is required, the wastewater in the solution tank 11 is fed into the heat exchanger 22 for preheating. The preheated wastewater is then transported to the inner rotating tank 131, causing the inner rotating tank 131 to rotate. Under the action of the rotation of the inner rotating tank 131, a liquid film is formed on the inner wall of the inner rotating tank 131. The water in the liquid film is heated and evaporated into steam under the action of the heat source in the jacket 133.

[0058] In this step, before the wastewater enters the evaporation unit 13, it needs to be pretreated by an existing pretreatment system to remove large particulate impurities and suspended solids to prevent clogging and damage to the wastewater evaporation treatment device of this invention. There are one or more solution tanks 11 to be treated. Each solution tank 11 is connected to the cold fluid side of the heat exchanger 22 via a pipeline. An electric valve is installed on the pipeline between the solution tank 11 and the heat exchanger 22. A compressed air input pipe 111 is connected to the upper part of the solution tank 11. The compressed air input pipe 111 can be connected to a compressed air source, and the wastewater to be treated in the solution tank 11 is forced into the heat exchanger 22 by compressed air for subsequent treatment. After compressed air is introduced, a large number of bubbles are generated in the wastewater to be treated. The presence of these bubbles enhances the flowability of the water. When the wastewater flows out of the treatment solution tank 11, it carries the compressed air trapped in the bubbles, creating a certain impact force, which makes the flow of the wastewater to be treated more rapid. In addition, the equipment investment is low, which can reduce maintenance workload and reduce operating costs to a certain extent. Furthermore, the use of compressed air can agitate the liquid in the treatment solution tank 11 to ensure uniform mixing and prevent impurities from settling at the bottom of the tank. In this embodiment, the upper part of the treatment solution tank 11 is connected to an upper exhaust pipe 112. When the air pressure inside the treatment solution tank 11 is high, the gas can be discharged through the upper exhaust pipe 112 to balance the pressure inside the tank.

[0059] The present invention connects to an external steam pipe (not shown in the figure). The external steam pipe can be divided into two paths. One path is connected to the first steam pipe 51, which is used to transport external steam through the external steam pipe, the first steam pipe 51, the steam compressor 21, and the second steam pipe 52 to the jacket 133 as start-up steam to heat the waste liquid inside the inner rotating tank 131. The other path can be connected to the input end of the hot fluid side of the heat exchanger to initially heat the wastewater to be treated flowing through the heat exchanger 22. The external steam pipe can be closed after the entire system is in operation.

[0060] In steps c and b, the steam in the inner rotating tank 131 enters the steam compressor 21 for compression and heating. As heating steam, it enters the jacket 133 to heat the liquid film in the inner rotating tank 131. After heat exchange with the liquid film in the inner rotating tank 131, the heating steam condenses into condensate.

[0061] Specifically, after the waste liquid enters the inner rotating tank 131, the liquid spreads and forms a liquid film on the inner circumference of the inner rotating tank 131 under the rotation and rolling of the inner rotating tank 131. Under the action of heating steam in the jacket 133, the solvent is heated and evaporated, and enters the steam compressor 21 through the first steam pipe 51 to be heated to high temperature, high pressure and high quality steam. Then it is transported to the jacket 133 through the second steam pipe 52. This fully utilizes the heat of the solvent (generally water) vapor in the inner rotating tank 131, and makes full and effective use of the heat of solvent evaporation in wastewater heating. The amount of external steam used is small, and external steam is only needed during the initial start-up and not needed thereafter, thus reducing energy consumption. This invention realizes the recovery and reuse of the solvent (in this embodiment, the solvent is water) vapor in the inner rotating tank 131, reduces dependence on external steam (i.e., external energy), and significantly reduces energy consumption and operating costs.

[0062] The condensate from steps d and c is fed into heat exchanger 22, where it exchanges heat with the wastewater to be heated before entering clean water tank 12. In other words, the condensate from step c is fed into heat exchanger 22 to heat the wastewater before being discharged into clean water tank 12.

[0063] Step e, repeat step cd until the wastewater in the inner rotating tank 131 is concentrated to the target concentration, then the concentrated liquid is further processed to complete the evaporation and concentration of the wastewater.

[0064] The inner rotating tank 131 is equipped with a cleaning device 3 to prevent deposits from forming inside the inner rotating tank 131. The cleaning device 3 is stationary relative to the outer sealed tank 132. The cleaning device 3 of the present invention can be the same as the cleaning device in Embodiment 1, for example, the scraper 32 structure of Embodiment 1.

[0065] In steps b and c, when the inner rotating tank 131 rotates, the sediment on the inner wall surface of the inner rotating tank 131 rotates with the inner rotating tank 131. When passing through the cleaning device 3, it is stirred by the cleaning device 3 to prevent the sediment from adhering to the inner wall surface of the inner rotating tank 131.

[0066] In step e, the specific method for subsequent processing of the concentrate is as follows: one or more concentrate tanks 8 are set up, and the concentrate in the inner rotating tank 131 is transported to the concentrate tank 8 by a pump (not shown in the figure). The concentrate after evaporation is collected in the concentrate tank 8 and further processed or safely stored according to its radioactivity level. The distilled water obtained by condensing the steam separated from the evaporation unit 13 can be reused or discharged in accordance with environmental protection standards.

[0067] Both the clear water tank 12 and the concentrated liquid tank 8 are equipped with vent pipes to maintain pressure balance within their respective tanks. A drain pipe is connected to the bottom of the clear water tank 12 to periodically remove impurities and sediment. A drain pipe is connected to the bottom of the concentrated liquid tank 8. Automatic vent valves are connected to the liquid outlet pipe 62 at the bottom of the jacket 133 to regulate the gas pressure within the evaporation unit 13 and ensure smooth liquid outflow.

[0068] This invention allows for the installation of electric valves on various pipelines to control the opening and closing of corresponding pipelines. The electric valves, drive components, and automatic exhaust valves can all be controlled by a PLC control system. The entire evaporation process of this invention can be monitored and regulated by an advanced automated control system (PLC control system), which can automatically adjust operating parameters based on real-time data, ensuring the stability of the evaporation process and product quality, while also improving operational safety. Furthermore, the evaporation device of this invention avoids the use of chemical reagents for wastewater treatment, reducing the generation of chemical waste and mitigating environmental impact.

[0069] The modular radioactive wastewater evaporation treatment device and method of this invention achieves significant improvements and advantages over existing technologies through its unique technical features. First, by employing steam mechanical recompression technology, thermal efficiency is significantly improved and energy consumption is reduced, saving substantial energy costs compared to traditional evaporation technologies. Second, the modular design provides the equipment with extremely high flexibility and scalability, allowing the equipment to flexibly adjust its processing capacity according to changes in wastewater treatment needs, while simplifying manufacturing and maintenance processes and improving economic efficiency. Furthermore, the introduction of a mechanical cleaning system (cleaning device 3) effectively reduces maintenance requirements and extends the equipment's service life, maintaining efficient operation by continuously removing deposits from the heating surface. The addition of an automated control system, namely, controlling drive components and electric valves through a PLC control system, not only improves the level of automation, ensuring the stability of the treatment process and product quality, but also enhances operational safety and reduces the risks of manual operation. Finally, the environmentally friendly treatment method of this invention avoids the use of chemical reagents, reducing the generation of chemical waste and secondary pollution, thus meeting environmental protection requirements. The beneficial effects directly resulting from these technical features enable this invention to demonstrate significant advantages in the field of nuclear energy wastewater treatment, improving treatment efficiency, ensuring product quality, and reducing operating costs and environmental impact.

[0070] Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

Claims

1. A modular radioactive wastewater evaporation treatment device, characterized in that, The system includes an evaporation module and a compression heat exchange module. The compression heat exchange module includes a steam compressor and a heat exchanger, which includes a hot fluid side and a cold fluid side. The high-temperature fluid on the hot fluid side and the low-temperature fluid on the cold fluid side transfer heat to each other. The evaporation module includes a tank for temporarily storing wastewater to be treated, a clear water tank for collecting condensate, and at least one evaporation unit. Each evaporation unit includes an inner rotating tank and an outer sealed tank fitted outside the inner rotating tank. An interlayer is formed between the inner rotating tank and the outer sealed tank. The inner rotating tank and the outer sealed tank are rotatably connected. The inner rotating tank is horizontally positioned. The solution tank to be treated is connected to the interior of the inner rotating tank through the cold fluid side of the heat exchanger. The inner rotating tank is connected to the inlet end of the steam compressor through the first steam pipeline. The outlet end of the steam compressor is connected to the jacket through the second steam pipeline. The jacket is connected to the clear water tank through the hot fluid side of the heat exchanger. A rotating shaft is fixedly installed at one end of the inner rotating tank along the axial direction. The rotating shaft is connected to the output end of the drive component. A through hole is opened coaxially at the other end of the inner rotating tank along the axial direction. An outer cylinder is coaxially fixedly connected at the through hole. The outer diameter of the outer cylinder is smaller than the outer diameter of the inner rotating tank. The corresponding ends of the outer cylinder and the inner rotating tank form a stepped shape. An inner tube is coaxially and fixedly inserted into one end of the outer sealed tank corresponding to the outer connecting tube. One axial end of the inner connecting tube extends into the inner rotating tank and is coaxially and fixedly connected to an inner baffle. The inner circumferential surface of the outer connecting tube is rotatably connected to the outer circumferential surface of the inner connecting tube through a bearing. The inner baffle has a ring-shaped structure, and the outer diameter of the inner baffle is larger than the diameter of the through hole at the connecting end of the outer connecting tube of the inner rotating tank. The other axial end of the inner tube is coaxially and fixedly connected to an annular outer baffle. The evaporation unit includes a pipe connection section located at the end of the evaporation unit opposite to the drive component. The pipe connection section includes an air inlet pipe connected to the upper part of the corresponding end of the jacket, a liquid outlet pipe connected to the bottom of the jacket, an air inlet pipe connected to the inner rotating tank, a concentrate discharge pipe, and an exhaust pipe connected to the lower part of the inner connecting cylinder. The air inlet pipe and the concentrate discharge pipe are both installed on the inner connecting cylinder and connected to the outside. The concentrate discharge pipe extends inside the inner rotating tank to the end near the drive component installation end. There are gaps between the inner circumferential surface of the inner baffle and the air inlet pipe and the concentrate discharge pipe. The outer baffle is a ring-shaped structure with its inner circumferential surface flush with the inner circumferential surface of the inner connecting cylinder. A flange sealing plate is provided at the end of the outer baffle away from the inner connecting cylinder. The flange sealing plate only has through-holes for the air inlet pipe and the concentrate discharge pipe. The exhaust pipe is connected to the first steam pipe, and the air inlet pipe is connected to the second steam pipe.

2. The modular radioactive wastewater evaporation treatment device according to claim 1, characterized in that, The inner rotating tank is equipped with a cleaning device to prevent deposits from accumulating inside the inner rotating tank, and the cleaning device is stationary relative to the outer sealed tank.

3. The modular radioactive wastewater evaporation treatment device according to claim 2, characterized in that, The cleaning device includes a support rod disposed in the lower part of the inner rotating tank, the axis of the support rod being parallel to the axis of the inner rotating tank, the support rod being fixedly connected to the outer sealed tank, and a cleaning part being disposed on the support rod; The cleaning unit includes multiple scrapers arranged axially along the support rod; or The cleaning unit includes spiral blades that are spirally wound around the support rod.

4. The modular radioactive wastewater evaporation treatment device according to claim 3, characterized in that, When the cleaning unit includes multiple scrapers, the scrapers are arranged vertically, and the included angle between the scraper and the corresponding support rod is greater than 0° and less than 90°.

5. The modular radioactive wastewater evaporation treatment device according to claim 1, characterized in that, The modular radioactive wastewater evaporation treatment device also includes a main frame, on which all the evaporation units are centrally located.

6. A modular radioactive wastewater evaporation treatment device according to claim 5, characterized in that, The outer sealing tank is fixedly mounted on the main frame.

7. A modular method for treating radioactive wastewater by evaporation, characterized in that, Using the modular radioactive wastewater evaporation treatment apparatus according to any one of claims 1-6, the following steps are included: Step a: Determine the number of evaporation units based on the amount of radioactive wastewater to be treated, and connect and assemble the evaporation units with the steam compressor, the heat exchanger, the tank of the solution to be treated, and the clear water tank; Step b: The radioactive wastewater is temporarily stored in the solution tank to be treated. When treatment is required, the wastewater to be treated in the solution tank is input into the heat exchanger for preheating. The preheated wastewater to be treated is then transported into the inner rotating tank, causing the inner rotating tank to rotate. Under the action of the rotation of the inner rotating tank, a liquid film is formed on the inner wall surface of the inner rotating tank. The water in the liquid film is heated and evaporated into steam under the action of the heat source in the jacket. In steps c and b, the steam in the inner rotating tank enters the steam compressor for compression and heating. As heating steam, it enters the jacket to heat the liquid film in the inner rotating tank. After heat exchange with the liquid film in the inner rotating tank, the heating steam condenses into condensate. The condensate from steps d and c is fed into the heat exchanger, where it exchanges heat with the wastewater to be heated before entering the clean water tank. Step e, repeat step cd until the wastewater in the inner rotating tank is concentrated to the target concentration, then perform subsequent processing on the concentrated solution to complete the evaporation and concentration of the wastewater.

8. The modular radioactive wastewater evaporation treatment method according to claim 7, characterized in that, The inner rotating tank is equipped with a cleaning device to prevent deposits from forming inside the inner rotating tank, and the cleaning device is stationary relative to the outer sealed tank. In steps b and c, as the inner rotating tank rotates, the sediment on the inner wall surface of the inner rotating tank rotates with the inner rotating tank. When passing through the cleaning device, it is agitated by the cleaning device to prevent the sediment from adhering to the inner wall surface of the inner rotating tank.

9. A modular radioactive wastewater evaporation treatment method according to claim 7, characterized in that, In step e, the specific method for subsequent processing of the concentrate is as follows: one or more concentrate tanks are set up, and the concentrate in the inner rotating tank is pumped into the concentrate tank.

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