A device and method for achieving zero discharge of high-salt and high-COD wastewater by using freezing method

Abstract

The present invention relates to the technical field of high-salt sewage treatment, and in particular to a device and method for achieving zero discharge of high-salt and high-COD wastewater by using a freezing method. The device comprises a bottom plate and an upper shell which can be separated from the bottom plate upwards, a refrigerator is arranged at the top of the upper shell, a water storage ring is fixedly connected to the top of the bottom plate, a container is formed between the water storage ring and the top of the bottom plate, and six extensions are evenly arranged on the outside of the water storage ring. When the present invention is used, it is necessary to first sample and measure the freezing point of the contaminated water. After obtaining the freezing point temperature of the contaminated water, the present invention discharges the sewage into the inner side of the water storage ring through a water inlet pipe on the bottom plate, and then controls the refrigerator to start cooling, so that the cooling temperature is slightly lower than the freezing point temperature of the contaminated water, and the temperature difference between the cooling temperature and the freezing point temperature of the contaminated water is reduced, which, on the one hand, plays a role in prolonging the freezing time, and on the other hand, reduces energy consumption by reducing the temperature difference between the inside and outside of the upper shell.

Description

Technical Field

[0001] The invention relates to the technical field of high-salt sewage treatment, and specifically to a device and method for achieving zero discharge of high-salt and high-COD wastewater by using a freezing method. Background Art

[0002] In the treatment of high-salinity and high-COD wastewater, the most commonly used method is evaporation. Evaporation is the process of heating the wastewater to boil and evaporate the water in the wastewater, and then condensing the steam into fresh water, while recovering high-purity crystalline salt. Common evaporation technologies include multiple-effect evaporation (MED) and mechanical vapor recompression evaporation (MVR).

[0003] Evaporation method for treating organic wastewater has the advantages of convenient operation, simple process, and good quality of treated fresh water. However, there are still some disadvantages in treating organic wastewater (including landfill leachate) by evaporation method: 1) It requires proper pretreatment and has high operating costs; 2) In actual operation, it is impossible to completely separate water and volatile organic matter (light components), and the two are easy to form azeotropy and be separated and collected together; 3) Due to the high temperature operating environment, the corrosion rate of sewage on equipment materials is greatly increased, resulting in high cost of large-scale production equipment, and during operation, the equipment is prone to scaling and high operating energy consumption.

[0004] The freezing method is based on the phenomenon of removing impurities during the freezing and crystallization of water molecules, thereby separating and obtaining relatively pure ice and concentrated solutions. When wastewater containing only soluble pollutants gradually freezes, ice crystals grow only from pure water, and pollutants are concentrated and retained in the liquid phase, thereby separating pollutants from pure water. The freezing method is a physical separation method. The latent heat of vaporization of water under normal pressure is about 7 times the latent heat of melting of ice. Therefore, compared with the thermal method, the freezing method theoretically requires less energy. Moreover, the freezing method is carried out at low temperatures, which can reduce corrosion and scaling of equipment. Therefore, the freezing method has the advantages of low energy consumption, less pollution, and light corrosion and scaling.

[0005] During the freezing process, part of the concentrated solution will be wrapped in the ice body. Therefore, the removal effect of simple freezing is not ideal, and it is necessary to combine other processes to further separate organic matter and salt from the ice body. The present invention provides a relatively novel method to guide the wrapped concentrated liquid to some specific positions of the frozen ice cubes, and then guide the wrapped concentrated liquid out, which can discharge and process the concentrated liquid more effectively and accurately.

[0006] Therefore, in order to solve the above problems, a device and method for achieving zero discharge of high-salt and high-COD wastewater by using a freezing method is proposed. Summary of the invention

[0007] The purpose of the present invention is to provide a device for achieving zero discharge of high-salt and high-COD wastewater by freezing, so as to solve the problem proposed in the above background technology that part of the concentrated solution is wrapped in the ice body before it can be discharged. Therefore, the removal effect of simple freezing is not ideal, and it is necessary to combine other processes to further separate organic matter and salt from the ice body. The present invention provides a relatively novel method to guide the wrapped concentrated liquid to some determined positions of the frozen ice blocks, and then guide the wrapped concentrated liquid out, so that the concentrated liquid can be discharged and processed more effectively and accurately.

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a device for achieving zero discharge of high-salt and high-COD wastewater by freezing method, comprising a bottom plate and an upper shell that can be separated from the bottom plate upwards, a refrigerator is arranged at the top of the upper shell, a water storage ring is fixedly connected to the top of the bottom plate, a container is formed between the water storage ring and the top of the bottom plate, and six extensions are evenly arranged on the outer side of the water storage ring;

[0009] Under the above settings, when the present invention is used, it is necessary to first sample and measure the freezing point of the contaminated water. After obtaining the freezing point temperature of the contaminated water, the present invention discharges the sewage into the inner side of the water storage ring through the water inlet pipe on the bottom plate, and then controls the refrigerator to start refrigeration, so that the refrigeration temperature is slightly lower than the freezing point temperature of the contaminated water, and the temperature difference between the refrigeration temperature and the freezing point temperature of the contaminated water is reduced, which, on the one hand, plays a role in extending the freezing time, and on the other hand, reduces the energy consumption by reducing the temperature difference between the inside and outside of the upper shell. Among them, the present invention arranges six extension parts on the outside of the water storage ring to form an extension part, which can play a role in uniform cooling and increase the synchronization of freezing of sewage in the water storage ring;

[0010] A connecting plate corresponding to the shape of the water storage ring and the extension is arranged on the inner side of the upper shell, and a connecting rod evenly spaced is fixedly connected to the bottom end of the connecting plate, and the connecting rod can be embedded downward into the inner side of the water storage ring and the extension, and the bottom of the connecting rod can contact the top of the bottom plate, and the connecting rod is made of a heat-conducting material, and a circulation pipe is arranged in the connecting plate, and both ends of the circulation pipe are connected to connecting pipes, and the connecting pipes are arranged on the outer side of the upper shell;

[0011] Under the above arrangement, the present invention arranges a connecting plate on the upper side of the water storage ring, and a connecting rod on the lower side of the connecting plate. The connecting rod can penetrate downwardly into the inner side of the water storage ring. After the sewage in the water storage ring begins to freeze, the pollutants flow into the liquid phase. After the ice is formed, the connecting rod can be heated. The connecting rods evenly arranged at multiple points can melt the ice cubes near the connecting rods, forming a concentrated liquid discharge channel that penetrates from top to bottom. The appearance of the channel also reduces the integrity of the ice cubes. If necessary, it will also facilitate the subsequent crushing of the ice cubes to achieve solid-liquid separation.

[0012] At the same time, during the freezing process, because the connecting rod is in contact with the external space, the temperature of the external space is relatively high, so that the temperature at the connecting rod will be slightly higher than that of the surrounding area. The connecting rods evenly arranged at multiple points make the surrounding area form a "high temperature" area centered on it. In this case, the connecting rods evenly arranged at multiple points in the sewage will freeze last. At this time, the pollutants will tend to concentrate at the connecting rods and form a wrapped concentrate. When the wrapped concentrate appears at the connecting rods, rapid and quick separation of the concentrate can be achieved.

[0013] A water inlet pipe connected to the inner side of the water storage ring is arranged on one side of the bottom plate, and a drainage pipe connected to the inner side of the bottom end of the water storage ring is arranged at the bottom end of the bottom plate;

[0014] The drain pipe is used to discharge the concentrate.

[0015] The connecting rod is provided with an expansion object.

[0016] In the above arrangement, the expansion member is used to increase the effective influence area of ​​the connecting rod.

[0017] As an optional solution of the device for achieving zero discharge of high-salt and high-COD wastewater by freezing method described in the present invention, the arc length of the water storage ring corresponding to the width of the extension portion is equal to the circumference of the water storage ring divided by 6.

[0018] Under the above settings, when the arc length of the water storage ring corresponding to the width of the extension portion is equal to the circumference of the water storage ring divided by 6, while increasing the contact surface with the low temperature, at different positions of the water storage ring, the difference in distance from the depth position of the water storage ring to the surface position of the water storage ring is minimal, and the absolute distance of the difference is also small, which can maintain the consistency of ice formation to the greatest extent;

[0019] As an optional solution of the device for achieving zero discharge of high-salt and high-COD wastewater by freezing method described in the present invention, the inside of the connecting plate and the connecting rod are made of copper, and the outside of the connecting plate is provided with insulation material.

[0020] Under the above settings, copper has excellent thermal conductivity, which can facilitate the transfer of external temperature to the connecting rod; the outer side of the connecting plate is provided with insulation material to prevent the low temperature from quickly taking away the temperature of the connecting plate, so that the external temperature can smoothly reach the connecting rod;

[0021] As an optional solution of the device for achieving zero discharge of high-salt and high-COD wastewater by freezing method described in the present invention, the outer side of the connecting rod is evenly provided with inclined connecting parts, and the inclined connecting parts are arranged in a long strip shape.

[0022] Under the above arrangement, the present invention evenly arranges inclined connecting parts on the outside of the connecting rod, and the inclined connecting parts are distributed throughout the sewage. After the sewage is frozen, the connecting rod can be heated, and the connecting rods and the inclined connecting parts evenly arranged at multiple points form a network and melt the ice cubes near the connecting rods, thereby forming a concentrated liquid discharge channel that runs through the upper and lower parts, so that the wrapped concentrated liquid contacts the inclined connecting parts to the greatest extent, which is convenient for the discharge of the concentrated liquid.

[0023] As an optional solution of the device for achieving zero discharge of high-salt and high-COD wastewater by freezing method described in the present invention, the connecting rod includes a wide portion and a narrow portion arranged continuously, and an expansion portion is arranged between the wide portion and the narrow portion.

[0024] Under the above configuration, the expansion portion can increase the effective area of ​​the connecting rod, making it easier for the wrapped concentrated liquid to appear at the expansion portion;

[0025] As an optional solution of the device for achieving zero discharge of high-salt and high-COD wastewater by freezing method described in the present invention, the wide part and the narrow part are fixedly connected, and the narrow part is rotatably connected with evenly arranged connecting pieces through a hinge, and a torsion spring is also arranged between the connecting piece and the outer side of the narrow part, and the connecting piece can be completely embedded downward into the cavity formed between the wide part and the narrow part.

[0026] Under the above setting, when the connecting rod enters the sewage, the connecting piece will expand outward under the action of the torsion spring, thereby forming an expanded part. By increasing the contact area, heat is concentrated on the expanded part, which facilitates the appearance of the wrapped concentrated liquid at the expanded part, thereby increasing the guiding effect. At the same time, under the action of the torsion spring, after the concentrated liquid discharge channel appears, the connecting piece can move inward to take out the ice cubes.

[0027] As an optional solution of the device for achieving zero discharge of high-salt and high-COD wastewater by freezing method described in the present invention, the wide part on the upper side and the narrow part on the lower side are slidably connected, and a spring sheet is fixedly connected at the connection between the wide part and the narrow part. The spring sheet is brass, and a stop block is arranged at the center of the spring sheet. When the connecting rod is not subjected to downward pressure, the spring sheet can be completely embedded in the cavity formed between the wide part and the narrow part.

[0028] Under the above setting, when the connecting rod enters the sewage, as the top of the connecting rod is continuously pressed downward, the spring sheet between the wide part and the narrow part will expand outward to form an expanded part. By increasing the contact area, the heat is concentrated in the expanded part, which facilitates the appearance of the wrapped concentrated liquid at the expanded part, thereby increasing the guiding effect. At the same time, under the elastic action of the spring sheet, after the concentrated liquid discharge channel appears, the connecting rod can be pulled upward to remove the ice cubes.

[0029] As an optional solution of the device for achieving zero discharge of high-salt and high-COD wastewater by freezing method described in the present invention, the connecting pipe is connected with a fan cylinder, the inner side of the fan cylinder is fixedly connected with a fan and a heating network, the outer side of the fan cylinder is provided with heat exchange fins, a folding cover is provided on one side of the fan cylinder, and a connecting ring is provided at the port of the folding cover, and pulling the connecting ring can change the amount of contact between the heat exchange fins and the external air.

[0030] Under the above settings, in order to ensure the heat of the connecting rod, the present invention also arranges a fan for increasing the flow of the medium inside the circulation pipe and a heating net for heating on the connecting pipe to facilitate the temperature increase of the connecting rod and the emergence of a concentrated liquid discharge channel at the connecting rod; by pulling the connecting ring, the contact amount between the heat exchange fins and the external air can be changed, thereby changing the heat exchange effect;

[0031] As an optional solution of the device for achieving zero discharge of high-salt and high-COD wastewater by freezing method described in the present invention, the bottom plate is suspended by supporting legs, and a side plate is also provided at the bottom plate. The top of the side plate is fixedly connected to a hydraulic rod, and the top of the hydraulic rod is fixedly connected to a heat exchange plate, the heat exchange plate is located at the hot air outlet of the refrigerator, the heat exchange plate is fixedly connected to the upper shell, a heat exchange water pipe is provided inside the heat exchange plate, and the other end of the heat exchange water pipe is connected to a water storage cylinder.

[0032] Under the above setting, the hydraulic rod is used for the lifting movement of the upper shell. The present invention arranges a heat exchange plate at the hot air outlet of the refrigerator, and passes water to the inner side of the heat exchange water pipe. The heat exchange plate can collect and store the heat generated by the refrigerator to the inner side of the water storage cylinder, which can be used to flush the concentrate discharge channel inside the ice cubes, thereby increasing the purity of the ice cubes.

[0033] A method for using a device for achieving zero discharge of high-salt and high-COD wastewater by using a freezing method, the steps of which are:

[0034] Step 1: Sampling and measuring the freezing point of the contaminated water. After obtaining the freezing point temperature of the contaminated water, the present invention discharges the sewage into the inner side of the water storage ring through the water inlet pipe on the bottom plate, and then controls the refrigerator to start refrigeration, so that the refrigeration temperature is slightly lower than the freezing point temperature of the contaminated water, thereby reducing the temperature difference between the refrigeration temperature and the freezing point temperature of the contaminated water;

[0035] Step 2: After the sewage in the water storage ring is frozen, it is heated at the connecting rods. The connecting rods evenly arranged at multiple points will melt the ice near them, forming a concentrated liquid discharge channel that runs through the top and bottom;

[0036] Step 3: flush the concentrated liquid discharge channel inside the ice cube to increase the purity of the ice cube.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] 1. A device for achieving zero discharge of high-salt and high-COD wastewater by a freezing method. When the present invention is used, it is necessary to first sample and measure the freezing point of the contaminated water. After obtaining the freezing point temperature of the contaminated water, the present invention discharges the sewage into the inner side of the water storage ring through the water inlet pipe on the bottom plate, and then controls the refrigerator to start cooling, so that the cooling temperature is slightly lower than the freezing point temperature of the contaminated water, and the temperature difference between the cooling temperature and the freezing point temperature of the contaminated water is reduced. On the one hand, it plays a role in extending the freezing time, and on the other hand, it reduces energy consumption by reducing the temperature difference between the inside and outside of the upper shell. Among them, the present invention arranges six extension parts on the outside of the water storage ring to form an extension part, which can play a role in uniform cooling and increase the synchronization of freezing of sewage in the water storage ring.

[0039] 2. This is a device that uses a freezing method to achieve zero discharge of high-salt and high-COD wastewater. The present invention arranges a connecting plate on the upper side of a water storage ring, and a connecting rod on the lower side of the connecting plate. The connecting rod can penetrate downwardly into the inner side of the water storage ring. After the sewage in the water storage ring begins to freeze, the pollutants flow into the liquid phase. After freezing, the connecting rod can be heated. The connecting rods evenly arranged at multiple points will melt the ice cubes nearby to form a concentrated liquid discharge channel that penetrates from top to bottom. The appearance of the channel also reduces the integrity of the ice cubes. If needed later, it will also facilitate the subsequent crushing of the ice cubes to achieve solid-liquid separation.

[0040] 3. This is a device that uses freezing method to achieve zero discharge of high-salt and high-COD wastewater. At the same time, during the freezing process, because the connecting rod is in contact with the external space, the temperature of the external space is relatively high, so that the temperature at the connecting rod will be slightly higher than that of the surrounding area. The connecting rods evenly arranged at multiple points make the surrounding areas form a "high temperature" area centered on them. In this case, the connecting rods evenly arranged at multiple points in the sewage will freeze last. At this time, the pollutants will tend to concentrate at the connecting rods and form a wrapped concentrate. When the wrapped concentrate appears at the connecting rods, rapid and quick separation of the concentrated liquid can be achieved.

[0041] 4. This is a device that uses freezing method to achieve zero discharge of high-salt and high-COD wastewater. When the arc length of the water storage ring corresponding to the width of the extension part is equal to the circumference of the water storage ring divided by 6, the contact surface with the low temperature is increased. At different positions of the water storage ring, the distance difference from the depth position of the water storage ring to the surface position of the water storage ring is the smallest, and the absolute distance of the difference is also small, which can maintain the consistency of ice to the greatest extent.

[0042] 5. This invention uses freezing method to achieve zero discharge of high-salt and high-COD wastewater. The outer side of the connecting rod is evenly provided with inclined connecting parts, and the inclined connecting parts are spread throughout the sewage. After ice is formed, the connecting rod can be heated. The connecting rods and the inclined connecting parts evenly arranged at multiple points form a network and melt the ice cubes near them, forming a concentrated liquid discharge channel that runs through the top and bottom, so that the wrapped concentrated liquid is in contact with the inclined connecting parts to the greatest extent, which is convenient for the discharge of the concentrated liquid.

[0043] 6. This is a device that uses freezing method to achieve zero discharge of high-salt and high-COD wastewater. When the connecting rod enters the sewage, the connecting piece will expand outward under the action of the torsion spring, thereby forming an expanded part. By increasing the contact area, heat is concentrated in the expanded part, which is convenient for the wrapped concentrated liquid to appear at the expanded part, thereby increasing the guiding effect. At the same time, under the action of the torsion spring, after the concentrated liquid discharge channel appears, the connecting piece can move inward to take it out of the ice cubes.

[0044] 7. This is a device that uses freezing method to achieve zero discharge of high-salt and high-COD wastewater. When the connecting rod enters the sewage, as the top of the connecting rod is continuously pressed down, the spring sheet between the wide part and the narrow part will expand outward to form an expanded part. By increasing the contact area, heat is concentrated in the expanded part, which facilitates the appearance of the wrapped concentrated liquid at the expanded part, thereby increasing the guiding effect. At the same time, under the elastic action of the spring sheet, after the concentrated liquid discharge channel appears, the connecting rod can be pulled upward to remove the ice. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a schematic diagram of the overall appearance installation structure of the present invention;

[0046] Figure 2 It is a schematic diagram of the internal installation structure of the upper housing of the present invention;

[0047] Figure 3 This is a schematic diagram of the appearance structure of the water storage ring of the present invention;

[0048] Figure 4 It is a schematic diagram of the top view of the installation structure of the water storage ring of the present invention;

[0049] Figure 5 This is a schematic diagram of the appearance structure of the connecting plate of the present invention when viewed from above;

[0050] Figure 6 This is a schematic diagram of the internal installation structure of the connecting plate of the present invention;

[0051] Figure 7 It is a schematic diagram of the internal installation structure of the fan cylinder of the present invention;

[0052] Figure 8 This is a schematic diagram of a further installation structure of the fan cylinder of the present invention;

[0053] Fig. 9 It is a schematic diagram of a further installation structure of the connecting rod of the present invention;

[0054] Fig.10 It is a schematic diagram of another installation structure of the connecting rod of the present invention;

[0055] Fig.11 This is another schematic diagram of the installation structure of the connecting rod of the present invention.

[0056] In the figure: 1. bottom plate; 2. drain pipe; 3. side plate; 4. hydraulic rod; 5. heat exchange water pipe; 6. heat exchange plate; 7. refrigerator; 8. upper shell; 9. connecting pipe; 10. fan cylinder; 11. water storage ring; 12. extension part; 13. torsion spring; 14. connecting piece; 15. connecting plate; 16. circulation pipe; 17. connecting rod; 17a. wide part; 17b. narrow part; 18. inclined connecting part; 19. water inlet pipe; 20. water storage cylinder; 21. supporting foot; 22. fan; 23. heating net; 24. connecting ring; 25. folding cover; 26. heat exchange fins; 27. spring sheet; 28. stop block. DETAILED DESCRIPTION

[0057] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0058] Example 1, please refer to Figure 1-8 , the present invention provides a technical solution:

[0059] A device for achieving zero discharge of high-salt and high-COD wastewater by using a freezing method, comprising a bottom plate 1 and an upper shell 8 that can be separated from the bottom plate 1 upwards, a refrigerator 7 is arranged at the top of the upper shell 8, a water storage ring 11 is fixedly connected to the top of the bottom plate 1, a container is formed between the water storage ring 11 and the top of the bottom plate 1, and six extensions 12 are evenly arranged on the outer side of the water storage ring 11;

[0060] Under the above settings, when the present invention is used, it is necessary to first sample and measure the freezing point of the contaminated water. After obtaining the freezing point temperature of the contaminated water, the present invention discharges the sewage into the inner side of the water storage ring 11 through the water inlet pipe 19 on the bottom plate 1, and then controls the refrigerator 7 to start refrigeration, so that the refrigeration temperature is slightly lower than the freezing point temperature of the contaminated water, and the temperature difference between the refrigeration temperature and the freezing point temperature of the contaminated water is reduced, which, on the one hand, plays a role in extending the freezing time, and on the other hand, reduces the energy consumption by reducing the temperature difference between the inside and outside of the upper shell 8. Among them, the present invention arranges six extensions 12 on the outside of the water storage ring 11 to form an extension, which can play a role in uniform cooling and increase the synchronization of the freezing of sewage in the water storage ring 11;

[0061] A connecting plate 15 corresponding to the shape of the water storage ring 11 and the extension portion 12 is arranged on the inner side of the upper shell 8, and the bottom end of the connecting plate 15 is fixedly connected with connecting rods 17 arranged at even intervals, and the connecting rods 17 can be embedded downward into the inner side of the water storage ring 11 and the extension portion 12, and the bottom thereof can contact the top of the bottom plate 1, and the connecting rods 17 are made of heat-conducting material. A circulation pipe 16 is arranged in the connecting plate 15, and both ends of the circulation pipe 16 are connected with connecting pipes 9, and the connecting pipes 9 are arranged on the outer side of the upper shell 8;

[0062] Under the above arrangement, the present invention arranges a connecting plate 15 on the upper side of the water storage ring 11, and a connecting rod 17 on the lower side of the connecting plate 15. The connecting rod 17 can penetrate downwardly through the inner side of the water storage ring 11. After the sewage in the water storage ring 11 begins to freeze, the pollutants flow toward the liquid phase. After the ice is formed, the connecting rod 17 can be heated. The connecting rods 17 evenly arranged at multiple points can melt the ice cubes near it, forming a concentrated liquid discharge channel that penetrates from top to bottom. The appearance of the channel also reduces the integrity of the ice cubes. If necessary, it will also facilitate the subsequent crushing of the ice cubes to achieve solid-liquid separation.

[0063] At the same time, during the freezing process, because the connecting rod 17 is in contact with the external space, the temperature of the external space is relatively high, so that the temperature at the connecting rod 17 will be slightly higher than that of the surrounding area. The connecting rods 17 evenly arranged at multiple points make the surrounding area form a "high temperature" area with the connecting rods 17 as the center. In this case, the connecting rods 17 evenly arranged at multiple points in the sewage will freeze last. At this time, the pollutants will tend to concentrate at the connecting rods 17 and form a wrapped concentrate. When the wrapped concentrate appears at the connecting rods 17, rapid and quick separation of the concentrate can be achieved.

[0064] A water inlet pipe 19 connected to the inner side of the water storage ring 11 is provided on one side of the bottom plate 1, and a drainage pipe 2 connected to the inner side of the bottom end of the water storage ring 11 is provided at the bottom end of the bottom plate 1;

[0065] The drain pipe 2 is used to discharge the concentrated liquid.

[0066] The connecting rod 17 is provided with an expansion member.

[0067] In the above arrangement, the expansion member is used to increase the area of ​​influence of the connecting rod 17 .

[0068] In this embodiment, the arc length of the water storage ring 11 corresponding to the width of the extension portion 12 is equal to the circumference of the water storage ring 11 divided by 6.

[0069] Under the above settings, when the arc length of the water storage ring 11 corresponding to the width of the extension portion 12 is equal to the circumference of the water storage ring 11 divided by 6, while increasing the contact surface with the low temperature, at different positions of the water storage ring 10, the difference in distance from the depth position of the water storage ring 11 to the surface position of the water storage ring 11 is minimal, and the absolute distance of the difference is also small, which can maintain the consistency of ice to the greatest extent;

[0070] In this embodiment, the inside of the connecting plate 15 and the connecting rod 17 are both made of copper, and the outside of the connecting plate 15 is provided with a heat-insulating material.

[0071] Under the above configuration, copper has excellent thermal conductivity, which facilitates the transfer of external temperature to the connecting rod 17; the outer side of the connecting plate 15 is provided with a heat-insulating material to prevent the low temperature from quickly taking away the temperature of the connecting plate 15, so that the external temperature can smoothly reach the connecting rod 17;

[0072] In the present embodiment, the connecting pipe 9 is connected to a fan cylinder 10, a fan 22 and a heating network 23 are fixedly connected to the inner side of the fan cylinder 10, heat exchange fins 26 are arranged on the outer side of the fan cylinder 10, a folding cover 25 is arranged on one side of the fan cylinder 10, a connecting ring 24 is arranged at the port of the folding cover 25, and pulling the connecting ring 24 can change the amount of contact between the heat exchange fins 26 and the external air.

[0073] Under the above settings, in order to ensure the heat of the connecting rod 17, the present invention also arranges a fan for increasing the flow of the medium inside the circulation pipe 16 and a heating net for heating on the connecting pipe 9 to facilitate the temperature increase of the connecting rod 17 and the emergence of a concentrated liquid discharge channel at the connecting rod 17; by pulling the above-mentioned connecting ring 24, the contact amount of the heat exchange fins 26 with the external air can be changed, thereby changing the heat exchange effect;

[0074] In this embodiment, the base plate 1 is suspended by supporting legs 21, and a side plate 3 is further provided at the base plate 1. A hydraulic rod 4 is fixedly connected to the top end of the side plate 3, and a heat exchange plate 6 is fixedly connected to the top end of the hydraulic rod 4. The heat exchange plate 6 is located at the hot air outlet of the refrigerator 7, and the heat exchange plate 6 is fixedly connected to the upper shell 8. A heat exchange water pipe 5 is provided in the heat exchange plate 6, and the other end of the heat exchange water pipe 5 is connected to a water storage cylinder 20.

[0075] Under the above setting, the hydraulic rod 4 is used for the lifting movement of the upper shell 8. The present invention arranges a heat exchange plate 6 at the hot air outlet of the refrigerator 7, and passes water to the inner side of the heat exchange water pipe 5. The heat exchange plate 6 can collect and store the heat generated by the refrigerator 7 to the inner side of the water storage cylinder 20, which can be used to flush the concentrated liquid discharge channel inside the ice cubes, thereby increasing the purity of the ice cubes.

[0076] Example 2: This example is a further improvement of Example 1. Figure 1-9 ,

[0077] The outer side of the connecting rod 17 is evenly provided with inclined connecting parts 18, and the inclined connecting parts 18 are arranged in a long strip shape.

[0078] Under the above arrangement, the present invention evenly arranges the inclined connection part 18 on the outside of the connecting rod 17, and the inclined connection part 18 is spread over the entire sewage. After the sewage is frozen, the connecting rod 17 can be heated, and the connecting rods 17 evenly arranged at multiple points and the inclined connection part 18 form a network and melt the ice cubes near them, forming a concentrated liquid discharge channel that runs through the top and bottom, so that the wrapped concentrated liquid contacts the inclined connection part 18 to the greatest extent, which is convenient for the discharge of the concentrated liquid.

[0079] Example 3: This example is a further improvement of Example 1. Figure 1-8 and 10, the connecting rod 17 includes a wide portion 17a and a narrow portion 17b which are continuously arranged, and an expansion portion is arranged between the wide portion 17a and the narrow portion 17b.

[0080] Under the above arrangement, the expansion portion can increase the effective area of ​​the connecting rod 17, making it easier for the wrapped concentrated liquid to appear at the expansion portion;

[0081] In this embodiment, the wide portion 17a and the narrow portion 17b are fixedly connected, and the narrow portion 17b is rotatably connected to evenly arranged connecting pieces 14 via a hinge. A torsion spring 13 is also arranged between the connecting piece 14 and the outer side of the narrow portion 17b, and the connecting piece 14 can be completely embedded downward into the cavity formed between the wide portion 17a and the narrow portion 17b.

[0082] Under the above arrangement, when the connecting rod 17 enters the sewage, the connecting piece 14 will expand outward under the action of the torsion spring 13, thereby forming an expanded part. By increasing the contact area, heat is concentrated in the expanded part, which facilitates the appearance of the wrapped concentrated liquid at the expanded part, thereby increasing the guiding effect. At the same time, under the action of the torsion spring 17, after the concentrated liquid discharge channel appears, the connecting piece 14 can move inward to take out the ice cubes.

[0083] Example 4: This example is a further improvement of Example 1. Figure 1-8and 11, the wide portion 17a on the upper side and the narrow portion 17b on the lower side are slidably connected, a spring sheet 27 is fixedly connected at the connection between the wide portion 17a and the narrow portion 17b, the spring sheet 27 is made of brass, a stop block 28 is arranged at the center of the spring sheet 27, when the connecting rod 17 is not subjected to downward pressure, the spring sheet 27 can be completely embedded in the cavity formed between the wide portion 17a and the narrow portion 17b.

[0084] Under the above arrangement, when the connecting rod 17 enters the sewage, as the top of the connecting rod 17 is continuously pressed downward, the spring sheet 27 between the wide portion 17a and the narrow portion 17b will expand outward to form an expanded portion. By increasing the contact area, heat is concentrated in the expanded portion, which facilitates the appearance of the wrapped concentrated liquid at the expanded portion, thereby increasing the guiding effect. At the same time, under the elastic action of the spring sheet 27, after the concentrated liquid discharge channel appears, the connecting rod 17 can be pulled upward to remove the ice cubes.

[0085] A method for using a device for achieving zero discharge of high-salt and high-COD wastewater by using a freezing method, the steps of which are:

[0086] Step 1: Sampling and measuring the freezing point of the contaminated water. After obtaining the freezing point temperature of the contaminated water, the present invention discharges the sewage into the inner side of the water storage ring 11 through the water inlet pipe 19 on the bottom plate 1, and then controls the refrigerator 7 to start refrigeration, so that the refrigeration temperature is slightly lower than the freezing point temperature of the contaminated water, thereby reducing the temperature difference between the refrigeration temperature and the freezing point temperature of the contaminated water;

[0087] Step 2: After the sewage in the water storage ring 11 is frozen, it is heated at the connecting rod 17. The connecting rods 17 evenly arranged at multiple points will melt the ice near it, forming a concentrated liquid discharge channel that runs through the top and bottom;

[0088] Step 3: flush the concentrated liquid discharge channel inside the ice cube to increase the purity of the ice cube.

[0089] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for achieving zero discharge of high-salt and high-COD wastewater by freezing method, characterized in that: It comprises a bottom plate (1) and an upper shell (8) which can be separated upward from the bottom plate (1), a refrigerator (7) is arranged at the top of the upper shell (8), a water storage ring (11) is fixedly connected to the top of the bottom plate (1), a container is formed between the water storage ring (11) and the top of the bottom plate (1), and six extension parts (12) are evenly arranged on the outer side of the water storage ring (11); A connecting plate (15) corresponding to the shape of the water storage ring (11) and the extension part (12) is arranged on the inner side of the upper shell (8); the bottom end of the connecting plate (15) is fixedly connected to connecting rods (17) arranged at even intervals; the connecting rods (17) can be embedded downward into the inner side of the water storage ring (11) and the extension part (12), and the bottom of the connecting rods (17) can be in contact with the top of the bottom plate (1); the connecting rods (17) are made of heat-conducting material; a circulation pipe (16) is arranged in the connecting plate (15); both ends of the circulation pipe (16) are connected to connecting pipes (9); and the connecting pipes (9) are arranged on the outer side of the upper shell (8); A water inlet pipe (19) connected to the inner side of the water storage ring (11) is provided on one side of the bottom plate (1), and a drainage pipe (2) connected to the inner side of the bottom end of the water storage ring (11) is provided at the bottom end of the bottom plate (1); The connecting rod (17) is provided with an expansion object.

2. According to claim 1, a device for achieving zero discharge of high-salt and high-COD wastewater by freezing method, characterized in that: The arc length of the water storage ring (11) corresponding to the width of the extension portion (12) is equal to the circumference of the water storage ring (11) divided by 6.

3. The device for achieving zero discharge of high-salt and high-COD wastewater by freezing method according to claim 2, characterized in that: The interior of the connecting plate (15) and the connecting rod (17) are both made of copper, and the outer side of the connecting plate (15) is provided with a heat-insulating material.

4. The device for achieving zero discharge of high-salt and high-COD wastewater by freezing method according to claim 3, characterized in that: The outer side of the connecting rod (17) is evenly provided with inclined connecting parts (18), and the inclined connecting parts (18) are arranged in a long strip shape.

5. The device for achieving zero discharge of high-salt and high-COD wastewater by freezing method according to claim 3, characterized in that: The connecting rod (17) comprises a wide portion (17a) and a narrow portion (17b) which are arranged continuously, and an expansion portion is arranged between the wide portion (17a) and the narrow portion (17b).

6. The device for achieving zero discharge of high-salt and high-COD wastewater by freezing method according to claim 5, characterized in that: The wide portion (17a) and the narrow portion (17b) are fixedly connected, and the narrow portion (17b) is rotatably connected to a uniformly arranged connecting piece (14) via a hinge, and a torsion spring (13) is further arranged between the connecting piece (14) and the outer side of the narrow portion (17b), and the connecting piece (14) can be completely embedded downward into a cavity formed between the wide portion (17a) and the narrow portion (17b).

7. The device for achieving zero discharge of high-salt and high-COD wastewater by freezing method according to claim 5, characterized in that: The wide portion (17a) located on the upper side and the narrow portion (17b) located on the lower side are slidably connected, and a spring sheet (27) is fixedly connected at the connection between the wide portion (17a) and the narrow portion (17b). The spring sheet (27) is made of brass, and a stop block (28) is arranged at the center of the spring sheet (27). When the connecting rod (17) is not subjected to downward pressure, the spring sheet (27) can be completely embedded in a cavity formed between the wide portion (17a) and the narrow portion (17b).

8. A device for achieving zero discharge of high-salt and high-COD wastewater by freezing method according to any one of claims 1 to 7, characterized in that: The connecting pipe (9) is connected to a fan cylinder (10), the inner side of which is fixedly connected to a fan (22) and a heating network (23), the outer side of which is provided with a heat exchange fin (26), a folding cover (25) is provided on one side of the fan cylinder (10), a connecting ring (24) is provided at the port of the folding cover (25), and by pulling the connecting ring (24), the amount of contact between the heat exchange fin (26) and the external air can be changed.

9. The device for achieving zero discharge of high-salt and high-COD wastewater by freezing method according to claim 8, characterized in that: The bottom plate (1) is suspended by supporting legs (21), and a side plate (3) is also provided at the bottom plate (1). The top end of the side plate (3) is fixedly connected to a hydraulic rod (4), and the top end of the hydraulic rod (4) is fixedly connected to a heat exchange plate (6). The heat exchange plate (6) is located at the hot air outlet of the refrigerator (7). The heat exchange plate (6) is fixedly connected to the upper shell (8). A heat exchange water pipe (5) is provided inside the heat exchange plate (6), and the other end of the heat exchange water pipe (5) is connected to a water storage cylinder (20).

10. A method for using the device for achieving zero discharge of high-salt and high-COD wastewater by freezing method as claimed in claim 9, characterized in that: The steps are: Step 1: Sampling and measuring the freezing point of the contaminated water. After obtaining the freezing point temperature of the contaminated water, the present invention discharges the sewage into the inner side of the water storage ring (11) through the water inlet pipe (19) on the bottom plate (1), and then controls the refrigerator (7) to start refrigeration, so that the refrigeration temperature is slightly lower than the freezing point temperature of the contaminated water, thereby reducing the temperature difference between the refrigeration temperature and the freezing point temperature of the contaminated water; Step 2: After the sewage in the water storage ring (11) is frozen, it is heated at the connecting rod (17). The connecting rods (17) evenly arranged at multiple points will melt the ice near it, forming a concentrated liquid discharge channel that runs through the top and bottom; Step 3: flush the concentrated liquid discharge channel inside the ice cube to increase the purity of the ice cube.

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