A sodium sulfate wastewater refining device

Abstract

The utility model discloses a kind of sodium sulfate wastewater refining device, including pretreatment component, primary evaporation crystallization component, waste heat recovery component, secondary evaporation crystallization component, solid-liquid separation component, liquid storage tank and control component, the utility model is guided slurry to form cyclone by multiple evaporation crystallization component's vertical evaporation tower inner spiral guide vane, cooperate the closed loop circulation structure of forced circulation heater, strengthen heat exchange uniformity;Waste heat recovery component is compressed after evaporator top secondary steam and is transported by gas pipeline, realizes heat source utilization to reduce energy consumption;The three-stage filtration mechanism of solid-liquid separation component is classified by stepped screen group and intercepts crystal, fine separation is carried out to slurry in combination with horizontal centrifuge, ensure the efficient separation of sodium sulfate crystal and liquid;Each component is connected in series by modularization layout to reduce fluid conveying resistance, the real-time coordination pump valve and sensor operation of the PLC controller of control component, guarantee system continuous stable operation.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment, and in particular to a sodium sulfate wastewater purification device. Background Technology

[0002] Sodium sulfate wastewater mainly originates from the production processes of industries such as chemical, pharmaceutical, and printing and dyeing. The wastewater contains high concentrations of sodium sulfate and impurities such as precipitates and heavy metals. Large amounts of sodium sulfate wastewater are generated in industries such as silica gel, precipitated silica, lithium batteries, desulfurization, chemical metallurgy, and environmental protection. When sodium sulfate wastewater is discharged into water bodies, it will cause serious pollution, leading to water acidification, a decrease in pH, and harm to aquatic organisms.

[0003] Currently, industrial production processes generate large amounts of sodium sulfate wastewater. Direct discharge of this wastewater leads to water and soil pollution and disrupts the ecological balance. Treatment methods for sodium sulfate wastewater mainly include physical, chemical, and biological methods. Physical methods, such as membrane separation and evaporation crystallization, can effectively remove sodium sulfate from wastewater. Chemical methods, such as neutralization precipitation and oxidation-reduction, remove harmful substances through chemical reactions. Biological methods utilize microorganisms to degrade organic pollutants and are suitable for sodium sulfate wastewater containing organic components. Existing treatment methods involve feeding the wastewater into an evaporator for evaporation. However, existing evaporators heat the wastewater through heating chambers on both sides, resulting in uneven heating and limited evaporation efficiency. Summary of the Invention

[0004] In view of this, the purpose of this utility model is to provide a sodium sulfate wastewater purification device to solve the problems mentioned in the background art. This utility model is convenient to use, simple to operate, highly systematic, and practical.

[0005] To achieve the above-mentioned technical objectives, the technical solution adopted by this utility model is as follows:

[0006] A sodium sulfate wastewater refining device includes a pretreatment component, a primary evaporation and crystallization component, a waste heat recovery component, a secondary evaporation and crystallization component, a solid-liquid separation component, a storage tank, and a control component. The pretreatment component includes an inlet pipe, a sedimentation tank, a suction pipe, a suction pump, and a primary filtration mechanism. The inlet pipe penetrates the top of the sedimentation tank and reaches its interior. The suction pipe also penetrates the top of the sedimentation tank and reaches its interior. The suction pipe connects the primary filtration mechanism and the sedimentation tank, and a suction pump is installed on the suction pipe. The primary evaporation and crystallization component is connected to the primary filtration mechanism via a first pipe. The waste heat recovery component includes an exhaust pipe, a vacuum pump, a steam compressor, and a gas delivery pipe. The pipeline connects the first-stage evaporation crystallization assembly to one end of the steam compressor. An air pump is installed on the exhaust pipeline, and the steam compressor is also connected to a gas supply pipeline. One end of the second-stage evaporation crystallization assembly is connected to the gas supply pipeline, and the other end is connected to the first-stage evaporation crystallization assembly. The solid-liquid separation assembly includes a three-stage filtration mechanism, a horizontal centrifuge, a liquid outlet pipeline, and a material outlet pipeline. One end of the three-stage filtration mechanism is connected to the horizontal centrifuge via a pipeline, and the other end is connected to the second-stage evaporation crystallization assembly. The horizontal centrifuge is connected to both the liquid outlet pipeline and the material outlet pipeline. The liquid storage tank is connected to the liquid outlet pipeline. The control component is a PLC controller.

[0007] Furthermore, the primary evaporation crystallization assembly includes a heating mechanism, a first evaporation tower, a first drain pipe, and a first drain valve. The heating mechanism is located outside the first evaporation tower, the first drain pipe is connected to the bottom of the first evaporation tower, and the first drain valve is installed on the first drain pipe.

[0008] Furthermore, the exhaust pipe connects the top of the first evaporation tower to one end of the steam compressor.

[0009] Furthermore, the heating mechanism includes multiple sets of heat exchange tubes and a shell, the shell covering the outer surface of the first evaporation tower, and the multiple sets of heat exchange tubes disposed between the shell and the first evaporation tower.

[0010] Furthermore, the secondary evaporation crystallization assembly includes a second evaporation tower, a steam distribution loop, a second drain pipe, and a second drain valve. The top of the second evaporation tower is connected to the first drain pipe. The outer surface of the second evaporation tower is surrounded by a steam distribution loop. The other end of the steam distribution loop is connected to a storage tank. The bottom of the second evaporation tower is connected to the second drain pipe, and the second drain pipe is connected to the second drain valve.

[0011] Furthermore, one end of the steam distribution ring pipe is connected to the gas transmission pipeline.

[0012] Furthermore, pressure sensors and temperature sensors are integrated inside the primary evaporator and the secondary evaporator.

[0013] Furthermore, the control component is electrically connected to the first drain valve, the second drain valve, the pressure sensor, and the temperature sensor, respectively.

[0014] By adopting the above technical solution, the beneficial effects of this utility model compared with the prior art are as follows:

[0015] This invention provides a sodium sulfate wastewater refining device, including a pretreatment component, a primary evaporation and crystallization component, a waste heat recovery component, a secondary evaporation and crystallization component, a solid-liquid separation component, a storage tank, and a control component. This invention uses spiral guide plates within the vertical evaporation towers of multiple evaporation and crystallization components to guide the slurry into a swirling flow, combined with a closed-loop circulation structure of a forced circulation heater to enhance heat exchange uniformity. The waste heat recovery component compresses the secondary steam at the top of the evaporation tower and transports it through a gas pipeline, utilizing the heat source to reduce energy consumption. The three-stage filtration mechanism of the solid-liquid separation component uses stepped screens to intercept crystals in stages, combined with a horizontal centrifuge to finely separate the slurry, ensuring efficient separation of sodium sulfate crystals from the liquid. The modular layout of each component in series reduces fluid transport resistance, and the PLC controller of the control component coordinates the operation of pumps, valves, and sensors in real time, ensuring continuous and stable system operation. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of a sodium sulfate wastewater refining device provided by this utility model;

[0018] Figure 2 This is a cross-sectional structural schematic diagram of the pretreatment component described in a specific embodiment of this utility model;

[0019] Figure 3 This is a cross-sectional structural diagram of the primary evaporation crystallization assembly and the secondary evaporation crystallization assembly described in a specific embodiment of this utility model;

[0020] Figure 4 This is a cross-sectional structural schematic diagram of the solid-liquid separation component according to a specific embodiment of the present invention;

[0021] Figure 5 This is a schematic diagram of the structure of the control component described in a specific embodiment of this utility model.

[0022] Figure label:

[0023] 1. Pretreatment component; 11. Inlet pipe; 12. Sedimentation tank; 13. Suction pipe; 14. Suction pump; 15. Primary filtration mechanism; 2. Primary evaporation crystallization component; 21. First pipe; 22. Heating mechanism; 221. Heat exchange tube; 222. Shell; 23. First evaporation tower; 24. First drain pipe; 25. First drain valve; 3. Waste heat recovery component; 31. Exhaust pipe; 32. Air pump; 33. Steam compressor; 34. Gas delivery pipe; 4. Secondary evaporation crystallization component; 41. Second evaporation tower; 42. Steam distribution loop pipe; 43. Second drain pipe; 44. Second drain valve; 5. Solid-liquid separation component; 51. Tertiary filtration mechanism; 52. Horizontal centrifuge; 53. Outlet pipe; 54. Outlet pipe; 6. Storage tank; 7. Control component; 8. Pressure sensor; 9. Temperature sensor. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be particularly noted that the following embodiments are only for illustrating the present invention and do not limit the scope of the present invention. Similarly, the following embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0025] Please see Figures 1-5This utility model provides a sodium sulfate wastewater refining device, including a pretreatment component 1, a primary evaporation and crystallization component 2, a waste heat recovery component 3, a secondary evaporation and crystallization component 4, a solid-liquid separation component 5, a storage tank 6, and a control component 7. The pretreatment component includes an inlet pipe 11, a sedimentation tank 12, a suction pipe 13, a suction pump 14, and a primary filtration mechanism 15. The inlet pipe 11 passes through the top of the sedimentation tank 12 and reaches the interior of the sedimentation tank 12. The suction pipe 13 passes through the top of the sedimentation tank 12 and reaches the interior of the sedimentation tank 12. The suction pipe 13 connects the primary filtration mechanism 15 and the sedimentation tank 12, and the suction pump 14 is installed on the suction pipe 13. The primary evaporation and crystallization component 2 is connected to the primary filtration mechanism 15 through a first pipe 21. The waste heat recovery component 3 includes an exhaust pipe 31, a vacuum pump 32, and a steam compressor. The steam compressor 33 is connected to the first-stage evaporation crystallization component 2 and one end of the steam compressor 33 via a gas supply pipe 34. A vacuum pump 32 is installed on the exhaust pipe 31, and the steam compressor 33 is also connected to the gas supply pipe 34. One end of the second-stage evaporation crystallization component 4 is connected to the gas supply pipe 34, and the other end of the second-stage evaporation crystallization component 4 is connected to the first-stage evaporation crystallization component 2. The solid-liquid separation component 5 includes a three-stage filtration mechanism 51, a horizontal centrifuge 52, a liquid outlet pipe 53, and a material outlet pipe 54. One end of the three-stage filtration mechanism 51 is connected to the horizontal centrifuge 52 via a pipe, and the other end of the three-stage filtration mechanism 51 is connected to the second-stage evaporation crystallization component 4. The horizontal centrifuge 52 is connected to both the liquid outlet pipe 53 and the material outlet pipe 54. The liquid storage tank 6 is connected to the liquid outlet pipe 53. The control component 7 is a PLC controller.

[0026] In this embodiment, the sodium sulfate wastewater refining device of this invention includes a pretreatment component 1, an evaporation and crystallization component, a waste heat recovery component 3, a solid-liquid separation component 5, and a control component 7. The pretreatment component 1 includes an inlet pipe 11, a sedimentation tank 12, and a primary filtration mechanism 15. The inlet pipe 11 is a pipe penetrating the top of the sedimentation tank 12, used to introduce wastewater into the tank. The sedimentation tank 12 is a cylindrical container with a conical sludge collection hopper at its bottom for settling large particulate impurities. One end of a suction pipe 13 extends into the upper part of the sedimentation tank 12, and the other end is connected to the primary filtration mechanism 15, through which the supernatant is transported to the filtration mechanism by a suction pump 14. The evaporation and crystallization component includes a vertical evaporation tower and a forced circulation heater. The vertical evaporation tower is equipped with a spiral guide plate to guide the slurry to form a swirling flow. The forced circulation heater is connected to the bottom of the evaporation tower via a circulation pump to form a closed-loop circulation to improve heat exchange efficiency. The waste heat recovery component 3 includes a steam compressor 33 and a gas delivery pipeline 34. The steam compressor 33 is connected to the top of the evaporation tower via an exhaust pipe 31, and is used to compress secondary steam and then return it to the evaporation tower via the gas delivery pipeline 34 as a heat source. The solid-liquid separation component 5 consists of a three-stage filtration mechanism 51 and a horizontal centrifuge 52. The three-stage filtration mechanism 51 is a stepped screen group used for graded interception of crystals. The feed inlet of the horizontal centrifuge 52 is connected to the filtration mechanism, and the liquid outlet pipe 53 and the discharge pipe 54 are respectively connected to the liquid storage tank 6 and the collection container to achieve solid-liquid separation. The control component 7 is a PLC controller, which is connected to each pump, valve and sensor via cables to coordinate the operation of the system. The outlet of the first-stage filtration mechanism 15 of the pretreatment component 1 is connected to the evaporation tower via the first pipe 21. The gas delivery pipeline 34 of the waste heat recovery component 3 is connected to the steam inlet at the bottom of the evaporation tower. The inlet of the three-stage filtration mechanism 51 of the solid-liquid separation component 5 receives the slurry discharged from the bottom of the evaporation tower via a pipeline, and the centrifuge completes the separation. The device adopts a modular layout, with each unit connected in series via flanges or quick-connect pipes to reduce fluid transport resistance.

[0027] In this embodiment, the sodium sulfate wastewater refining device utilizes the synergistic action of the sedimentation tank 12 and the primary filtration mechanism 15 in the pretreatment component 1. A conical sludge collection hopper settles large particles of impurities, while a suction pump 14 directionally extracts the supernatant, effectively improving pretreatment efficiency. The vertical evaporation tower of the evaporation crystallization component guides the slurry to form a swirling flow, and the closed-loop circulation structure of the forced circulation heater enhances heat exchange uniformity and inhibits crystal scaling. The steam compressor 33 of the waste heat recovery component 3 compresses the secondary steam at the top of the evaporation tower and returns it to the lower part of the evaporation tower via the gas pipeline 34, achieving heat source recycling to reduce energy consumption. The tertiary filtration mechanism 51 of the solid-liquid separation component 5 uses a stepped screen to intercept crystals in stages, combined with a horizontal centrifuge 52 to finely separate the slurry, ensuring efficient separation of sodium sulfate crystals and liquid. All components are connected in series through a modular layout, with flanges or quick-connect pipes reducing fluid transport resistance. The PLC controller of the control component 7 coordinates the operation of pumps, valves, and sensors in real time, ensuring continuous and stable system operation.

[0028] Furthermore, in some embodiments, the primary evaporation crystallization assembly 2 includes a heating mechanism 22, a first evaporation tower 23, a first drain pipe 24, and a first drain valve 25. The heating mechanism 22 is disposed outside the first evaporation tower 23, the first drain pipe 24 is connected to the bottom of the first evaporation tower 23, and the first drain valve is disposed on the first drain pipe 24.

[0029] In this embodiment, the primary evaporation crystallization assembly 2 includes a heating mechanism 22, a first evaporation tower 23, a first drain pipe 24, and a first drain valve. The heating mechanism 22 is a structure encased outside the first evaporation tower 23, containing a heat-conducting medium for indirect heating of the wastewater within the tower via an external heat source. The first evaporation tower 23 is a vertical cylindrical container with staggered baffles arranged from top to bottom to extend the wastewater flow path and promote crystal growth. The first drain pipe 24 is an L-shaped metal pipe, with one end vertically connected to the center of the bottom of the first evaporation tower 23 and the other end extending horizontally to an external collection device for discharging the concentrated slurry. The first drain valve 25 is a flanged ball valve located in the horizontal section of the first drain pipe 24, and its opening and closing are achieved manually or automatically. The heating mechanism 22 is welded to the first evaporation tower 23, with insulation material filling the space between them to reduce heat loss. The first drain pipe 24 is fastened to the bottom of the first evaporation tower 23 with flange bolts to ensure sealing and facilitate disassembly and maintenance. This structure avoids direct contact between heating components and high-salt wastewater through external heating, while the baffle layout optimizes the crystallization environment. The overall modular design reduces the risk of pipe blockage.

[0030] In this embodiment, the primary evaporation crystallization component 2 is designed with an external heating mechanism 22 enclosing the first evaporation tower 23. This design utilizes a heat-conducting medium to indirectly heat the wastewater, avoiding corrosion and scaling caused by direct contact between the heating components and the high-salt wastewater. The staggered baffles inside the first evaporation tower 23 extend the wastewater flow path and create a turbulent environment, promoting the orderly growth of sodium sulfate crystals. The L-shaped first drain pipe 24 is vertically connected to the bottom of the evaporation tower and extends horizontally to the collection equipment. Combined with the flanged ball valve for opening and closing control, it ensures smooth discharge of concentrated slurry and facilitates valve disassembly and maintenance. The structure of the heating mechanism 22 welded and fixed to the evaporation tower and filled with insulation material reduces heat loss and improves thermal efficiency, thereby reducing the risk of blockage and enhancing system maintainability.

[0031] Furthermore, in some embodiments, the exhaust pipe 31 connects the top of the first evaporation tower 23 to one end of the steam compressor 33.

[0032] In this embodiment, the exhaust pipe 31 is a round pipe made of stainless steel, with its inner wall polished to reduce steam flow resistance. One end of the exhaust pipe 31 is connected to the steam outlet at the top of the first evaporation tower 23 via flange bolts, and the other end is connected to the inlet flange of the steam compressor 33 by welding. The steam compressor 33 is a centrifugal compressor, and its inlet flange is coaxially aligned with the outlet end of the exhaust pipe 31. It is used to pressurize and heat the secondary steam discharged from the top of the first evaporation tower 23 and then deliver it to subsequent equipment. This connection structure, through optimized pipe layout and sealing design, ensures efficient recovery of secondary steam and reduces energy loss, while also facilitating disassembly and maintenance.

[0033] In this embodiment, the exhaust pipe 31 adopts a stainless steel circular pipe structure. Its inner wall polishing treatment effectively reduces steam flow resistance. The flange bolt connection method ensures the sealing and stability between the steam outlet at the top of the first evaporation tower 23 and the pipe. The outlet end of the exhaust pipe 31 is precisely connected to the inlet flange of the centrifugal steam compressor 33 by welding. The coaxial alignment design of the centrifugal compressor ensures that the secondary steam enters smoothly for pressurization and heating, improving the waste heat recovery efficiency. The flange connection structure combined with the welding fixing method realizes the optimization of the pipe layout, which facilitates the removal of flange bolts for equipment maintenance while maintaining the airtightness of the system. The overall connection structure between the exhaust pipe 31 and the steam compressor 33 reduces energy loss during steam transportation and reduces the risk of leakage caused by vibration or thermal deformation through enhanced sealing design and reasonable layout, thereby enhancing the reliability of system operation and the convenience of maintenance.

[0034] Furthermore, in some embodiments, the heating mechanism includes multiple sets of heat exchange tubes 221 and a housing 222, with the housing 222 covering the outer surface of the first evaporation tower 23, and the multiple sets of heat exchange tubes 221 disposed between the housing 222 and the first evaporation tower 23.

[0035] In this embodiment, the heating mechanism includes multiple sets of heat exchange tubes 221 and a shell 222. The shell 222 is an annular stainless steel jacket structure that covers the outer surface of the first evaporation tower 23 to form a sealed cavity for containing high-temperature heat transfer oil or steam as the heating medium. The multiple sets of heat exchange tubes 221 are U-shaped tubes made of copper or stainless steel, arranged in a spiral shape and uniformly distributed in the annular space between the shell 222 and the outer wall of the first evaporation tower 23. The two ends of the heat exchange tubes 221 are respectively connected to the medium inlet and outlet of the shell 222 to guide the circulation of the heat transfer medium and transfer heat to the inner wall of the evaporation tower. The shell 222 and the first evaporation tower 23 are fixed by welding or bolts, and the two are spaced apart to form an annular flow channel of uniform width to ensure heat exchange uniformity. The spiral direction of the heat exchange tubes 221 forms an angle of 30-45 degrees with the axis of the first evaporation tower 23, extending the medium flow path to improve heat exchange efficiency. The top of the shell 222 is provided with an exhaust valve interface for venting gas from the cavity; the bottom is provided with a drain port for periodic cleaning of deposited impurities. The structure achieves uniform heating of the outer wall of the evaporation tower through the cladding layout of the shell 222 and the synergistic effect of multiple heat exchange tubes 221, while avoiding the risk of corrosion caused by direct contact between the heating medium and wastewater. The whole structure adopts a detachable design to simplify the maintenance process.

[0036] In this embodiment, the heating mechanism covers the outer surface of the first evaporation tower 23 with a shell 222 of an annular stainless steel jacket structure, forming a sealed cavity to accommodate the heat transfer medium and achieve uniform heating of the outer wall of the evaporation tower. Multiple sets of U-shaped heat exchange tubes 221 are spirally arranged in the annular space between the shell 222 and the evaporation tower. The spiral direction forms a specific angle with the axis of the evaporation tower, extending the flow path of the heat transfer medium to improve heat exchange efficiency. The fixing method of the shell 222 and the evaporation tower ensures that the width of the annular flow channel is consistent. Combined with the connection structure of the two ends of the heat exchange tubes 221 with the medium inlet and outlet, it ensures smooth circulation of the heat transfer medium and stable heat transfer. The exhaust valve interface at the top of the shell 222 and the drain port at the bottom work together to remove gas in the cavity and clean deposited impurities, respectively, to maintain the cleanliness of the heating system. The overall structure, through the shell 222 covering layout and the spiral arrangement design of the heat exchange tubes 221, avoids the risk of corrosion caused by the heating medium directly contacting wastewater. At the same time, the detachable connection method simplifies the component maintenance process and enhances the system's operational reliability and service life.

[0037] Furthermore, in some embodiments, the secondary evaporation crystallization assembly 4 includes a second evaporation tower 41, a vapor distribution ring pipe 42, a second drain pipe 43, and a second drain valve 44. The second evaporation tower 41 is connected to the first drain pipe 24. The outer surface of the second evaporation tower 41 is surrounded by the vapor distribution ring pipe 42. The other end of the vapor distribution ring pipe 42 is connected to the liquid storage tank 6. The bottom of the second evaporation tower 41 is connected to the second drain pipe 43, and the second drain valve 44 is connected to the second drain pipe 43.

[0038] In this embodiment, the secondary evaporation crystallization assembly 4 includes a second evaporation tower 41, a steam distribution ring pipe 42, a liquid outlet 43, a second drain pipe 43, and a second drain valve 44. The second evaporation tower 41 is a vertical cylindrical structure. The steam distribution ring pipe 42 surrounding its outer surface is an annular stainless steel pipe with uniformly spaced steam injection holes to evenly introduce pressurized steam into the tower. The second drain pipe 43 is used to transport the slurry. The second drain valve 44 is a flanged gate valve located on the horizontal section of the second drain pipe 43, and its operation is controlled by raising and lowering the valve stem. The steam distribution ring pipe 42 is fixed to the outer wall of the second evaporation tower 41 by welding or annular clamps. This structure optimizes crystallization efficiency through the uniform heating provided by the steam distribution ring pipe 42 and the synergistic effect of the guide plate. The modular pipe connection design reduces the risk of blockage and improves maintainability.

[0039] In this embodiment, the secondary evaporation crystallization component 4 uses an annular stainless steel steam distribution ring pipe 42 that surrounds the outer surface of the second evaporation tower 41, with steam injection holes evenly opened in the circumference, so that pressurized steam is uniformly introduced into the tower, ensuring the consistency of thermal distribution during the crystallization process; the structure of the steam distribution ring pipe 42 and the liquid storage tank 6 optimizes the secondary steam discharge path and avoids condensate retention; the second drain pipe 43 is coaxially connected to the center of the tower bottom and extends to the solid-liquid separation device; the steam distribution ring pipe 42 is fixed to the outer wall of the second evaporation tower 41 by welding or annular clamps to form a stable steam diffusion cavity, which, together with the guide plate in the tower, enhances the turbulence of the slurry to improve the uniformity of crystal growth, enhance the system's operational stability and maintainability.

[0040] Furthermore, in some embodiments, one end of the steam distribution ring 42 is connected to the gas transmission pipeline 34.

[0041] In this embodiment, the steam distribution ring pipe 42 is an annular stainless steel pipe with an inner diameter matching the outlet end of the gas transmission pipeline 34. The diameter of the steam injection holes circumferentially opened in the ring pipe gradually increases along the steam flow direction to regulate the steam injection pressure distribution. The axes of the gas transmission pipeline 34 and the steam distribution ring pipe 42 are arranged horizontally and coaxially to ensure that steam enters the ring pipe cavity uniformly. This connection structure achieves efficient steam distribution and reduces pressure loss through optimized flange connection and steam flow channel design.

[0042] In this embodiment, the steam distribution ring pipe 42 adopts an annular stainless steel pipe structure, and its inner diameter is precisely matched with the outlet end of the gas transmission pipeline 34 to ensure the continuity of steam transmission. The diameter of the steam injection holes opened around the circumference of the ring pipe gradually increases along the steam flow direction. The injection pressure distribution is adjusted by gradient hole diameter change to avoid uneven steam distribution caused by excessive local pressure. The horizontal coaxial arrangement of the gas transmission pipeline 34 and the steam distribution ring pipe 42 ensures that the steam enters the ring pipe cavity evenly along the axis and eliminates the phenomenon of flow deviation. The flange docking structure reduces the risk of steam leakage while maintaining the connection stability through optimized sealing surface and fastener cooperation. The steam flow channel design combines the annular pipe body and the gradually expanding injection hole layout to achieve efficient steam diffusion and distribution, reduce flow resistance and pressure loss. The overall structure takes into account both steam utilization efficiency and system operation stability.

[0043] Furthermore, in some embodiments, pressure sensor 8 and temperature sensor 9 are integrated inside the primary and secondary evaporation towers.

[0044] In this embodiment, pressure sensor 8 is used to monitor the steam pressure inside the tower in real time and to collect slurry temperature data. The pressure sensor 8 in the first-stage evaporator is installed at one-third of the height from the top of the tower, horizontally aligned with the steam outlet; the temperature sensor 9 in the second-stage evaporator is located at half the height of the tower. The signal lines of pressure sensor 8 and temperature sensor 9 are led out through pre-installed conduits in the tower wall, filled with sealant to prevent steam leakage; the sensor junction box is fixed to an outer support of the tower body and connected to the PLC controller via a shielded cable. The sensors in the first-stage and second-stage evaporators are symmetrically distributed, with pressure sensor 8 close to the steam flow path and temperature sensor 9 positioned in the turbulent slurry region, working together to achieve real-time monitoring of the evaporation process.

[0045] In this embodiment, a pressure sensor 8 is installed horizontally at one-third of the height from the top of the first-stage evaporator, aligned with the steam outlet, to accurately monitor changes in steam pressure. A temperature sensor 9 is arranged in the middle of the second-stage evaporator, avoiding interference from the guide vanes to accurately collect slurry temperature data. In this symmetrical sensor distribution layout between the first and second-stage evaporators, the pressure sensor 8 is located close to the steam flow path to provide real-time feedback on pressure fluctuations, while the temperature sensor 9 is positioned in the turbulent slurry region to dynamically monitor the temperature field distribution. The two sensors work together to achieve synchronous and accurate acquisition of pressure and temperature parameters within the evaporator, providing reliable data support for automatic system control and enhancing the controllability and operational safety of the evaporation and crystallization process.

[0046] Furthermore, in some embodiments, the control component 7 is electrically connected to the first drain valve, the second drain valve 44, the pressure sensor 8, and the temperature sensor 9, respectively.

[0047] In this embodiment, the control component 7 is a wall-mounted PLC controller, which is equipped with a relay module and a signal converter to receive sensor signals and output valve control commands. The electrical connection structure suppresses signal interference through grounding of the shielding layer, and uses quick-connect connectors to achieve detachable connection between the sensor and the cable, which is convenient for maintenance and replacement.

[0048] In this embodiment, the PLC controller, through the coordinated action of its internal relay module and signal converter, receives the detection signals from the pressure sensor 8 and temperature sensor 9 in real time and outputs precise valve control commands to ensure automated control of the evaporation and crystallization process. The electrical connection structure employs a shielded grounding treatment to effectively suppress the impact of electromagnetic interference on sensor signal transmission, ensuring the stability and reliability of control commands. The quick-connect connector design enables rapid plug-and-play connection between the sensor and the cable, simplifying the disassembly and assembly process during equipment maintenance and avoiding the risk of wiring errors. The shielded cable and the spring-clamped terminals of the terminal block ensure long-term good contact of the signal transmission channel. The overall electrical connection scheme, through modular layout and standardized interface design, improves system maintenance efficiency and operational continuity.

Claims

1. A sodium sulfate wastewater purification device, characterized in that, include: The pretreatment component includes an inlet pipe, a sedimentation tank, a suction pipe, a suction pump, and a primary filtration mechanism. The inlet pipe passes through the top of the sedimentation tank and reaches the inside of the sedimentation tank. The suction pipe passes through the top of the sedimentation tank and reaches the inside of the sedimentation tank. The suction pipe connects the primary filtration mechanism and the sedimentation tank. A suction pump is installed on the suction pipe. A primary evaporation and crystallization assembly, wherein the primary evaporation and crystallization assembly is connected to a primary filtration mechanism via a first pipe; The waste heat recovery component includes an exhaust pipe, a vacuum pump, a steam compressor, and a gas delivery pipe. The exhaust pipe connects the first-stage evaporation crystallization component to one end of the steam compressor. The exhaust pipe is equipped with a vacuum pump, and the steam compressor is also connected to a gas delivery pipe. A secondary evaporation crystallization component, one end of which is connected to a gas transmission pipeline, and the other end of which is connected to the primary evaporation crystallization component; A solid-liquid separation assembly includes a three-stage filtration mechanism, a horizontal centrifuge, a liquid outlet pipe, and a material outlet pipe. One end of the three-stage filtration mechanism is connected to the horizontal centrifuge via a pipe, and the other end of the three-stage filtration mechanism is connected to a two-stage evaporation and crystallization assembly. The horizontal centrifuge is connected to both the liquid outlet pipe and the material outlet pipe. A liquid storage tank, which is connected to a liquid outlet pipe; The control component is a PLC controller.

2. The sodium sulfate wastewater purification apparatus as described in claim 1, characterized in that, The primary evaporation crystallization assembly includes a heating mechanism, a first evaporation tower, a first drain pipe, and a first drain valve. The heating mechanism is located outside the first evaporation tower, the first drain pipe is connected to the bottom of the first evaporation tower, and the first drain valve is installed on the first drain pipe.

3. The sodium sulfate wastewater purification apparatus as described in claim 2, characterized in that, The exhaust pipe connects the top of the first evaporator tower to one end of the steam compressor.

4. The sodium sulfate wastewater purification apparatus as described in claim 2, characterized in that, The heating mechanism includes multiple sets of heat exchange tubes and a shell. The shell covers the outer surface of the first evaporation tower, and the multiple sets of heat exchange tubes are disposed between the shell and the first evaporation tower.

5. The sodium sulfate wastewater purification apparatus as described in claim 2, characterized in that, The secondary evaporation crystallization assembly includes a second evaporation tower, a steam distribution loop, a second drain pipe, and a second drain valve. The top of the second evaporation tower is connected to the first drain pipe. The outer surface of the second evaporation tower is surrounded by the steam distribution loop. The other end of the steam distribution loop is connected to the liquid storage tank. The bottom of the second evaporation tower is connected to the second drain pipe, and the second drain pipe is connected to the second drain valve.

6. The sodium sulfate wastewater purification apparatus as described in claim 5, characterized in that, One end of the steam distribution ring pipe is connected to the gas transmission pipeline.

7. The sodium sulfate wastewater purification apparatus as described in claim 5, characterized in that, The first evaporator and the second evaporator are equipped with integrated pressure and temperature sensors.

8. The sodium sulfate wastewater purification apparatus as described in claim 1, characterized in that, The control components are electrically connected to the first drain valve, the second drain valve, the pressure sensor, and the temperature sensor, respectively.

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