A multi-effect condensation, freezing and crystallization high-salt water treatment system

Abstract

The invention discloses a multi-effect condensation freezing crystallization high-salt water treatment system, which includes a brine tank and an ice melting recovery tank, wherein the brine tank is connected to an ice crystal generator through a first pipeline, the ice crystal generator is connected to a liquid crystal separator through a second pipeline, the liquid crystal separator is connected to a salt dehydrator through a third pipeline, the salt dehydrator is connected to the brine tank through a fourth pipeline, the liquid crystal separator is connected to the brine tank through a fifth pipeline, the liquid crystal separator is connected to the ice crystal dehydrator through a sixth pipeline, the ice crystal dehydrator is connected to the brine tank through a seventh pipeline, a cleaning pipeline is connected between the ice crystal dehydrator and the ice melting recovery tank, a refrigeration unit is connected between the ice crystal generator and the ice melting recovery tank, the evaporator of the refrigeration unit is located in the ice crystal generator, and the condenser of the refrigeration unit is located in the ice melting recovery tank. The purpose is to provide a multi-effect condensation freezing crystallization high-salt water treatment system with low energy consumption, easy maintenance, and stable operation.

Description

Technical Field

[0001] The invention relates to the field of high-salt water treatment, and in particular to a system for treating high-salt water. Background Art

[0002] High-salinity wastewater refers to wastewater with a total salt content (based on NaCl) of more than 1% by mass. It contains salt substances such as NaCl, Na2SO4, and CaSO4. Large amounts of high-salinity wastewater discharged from industrial wastewater and urban sewage directly lead to increased mineralization of river water quality, causing increasingly serious pollution to soil, surface water, and groundwater, endangering the ecological environment. The long-term use of water with seriously excessive salt and chloride ion content to irrigate farmland has caused increasingly serious secondary salinization of soil, reduced crop yields, and declining benefits year by year. The conductivity of the water quality salt content index of the Yellow River in its Qinghai source is only 200μS / cm. In Baotou in the middle reaches of the Yellow River, the conductivity rises to 800-1000μS / cm, and in Jinan and Dongying in the lower reaches of the Yellow River, the conductivity is as high as 1000-1500μS / cm. The increase in the hardness of high-salinity groundwater is harmful to human health to a certain extent, and it will also corrode industrial equipment and shorten the service life of equipment. When industry needs to reduce the hardness of water, it costs money to soften it and discharge the calcium chloride and magnesium softening waste liquid, which then seeps into the ground and further pollutes the groundwater, increasing the chloride and hardness of the groundwater, forming a vicious circle.

[0003] Considering the environmental protection requirements, the mine drainage of the traditional coal industry will no longer be able to be discharged directly due to the excessive salt content in it. The salt in the water must be removed before it can be discharged. At present, the commonly used treatment process of enterprises is membrane method + evaporation, which has many defects such as high energy consumption, high maintenance, unstable operation, etc. In addition, the equipment is prone to scaling, clogging, corrosion and other problems. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a multi-effect condensation, freezing and crystallization high-salt water treatment system with low energy consumption, easy maintenance and stable operation.

[0005] The multi-effect condensation freezing crystallization high-salt water treatment system of the present invention comprises a brine tank and an ice melting recovery tank, wherein the brine tank is connected to an ice crystal generator through a first pipeline, a water supply pump is arranged on the first pipeline, the ice crystal generator is connected to a liquid crystal separator through a second pipeline, the lower part of the liquid crystal separator is connected to a salt dehydrator through a third pipeline, the water outlet of the salt dehydrator is connected to the brine tank through a fourth pipeline, the middle part of the liquid crystal separator is connected to the brine tank through a fifth pipeline, the upper part of the liquid crystal separator is connected to the ice crystal dehydrator through a sixth pipeline, the ice crystal dehydrator is connected to the brine tank through a seventh pipeline, a cleaning pipeline is connected between the ice crystal dehydrator and the ice melting recovery tank, a cleaning pump is arranged on the cleaning pipeline, a material outlet of the ice crystal dehydrator is located above the ice melting recovery tank, a refrigeration unit is connected between the ice crystal generator and the ice melting recovery tank, an evaporator of the refrigeration unit is located in the ice crystal generator, and a condenser of the refrigeration unit is located in the ice melting recovery tank.

[0006] The present invention discloses a multi-effect condensation, freezing and crystallization high-salt water treatment system, wherein the brine tank is connected to a water supply pipe, the water supply pipe is connected to an ice melter, the ice melter is located in an ice melt recovery tank, the ice melt recovery tank includes a first tank and a second tank which are interconnected, the discharge port of the ice crystal dehydrator is located above the first tank, the ice melter is located in the first tank, the condenser of the refrigeration unit is located in the second tank, one end of the cleaning pipeline is connected to the top of the ice crystal dehydrator and extends into the ice crystal dehydrator, the other end of the cleaning pipeline is connected to the second tank, one end of the cleaning pipeline is connected to a cleaning nozzle, and the cleaning nozzle is located in the ice crystal dehydrator.

[0007] The multi-effect condensation freezing crystallization high-salt water treatment system of the present invention, wherein a supplementary cooler and a low-temperature re-cooler are sequentially connected to the pipeline between the condenser and the expansion valve of the refrigeration unit, the supplementary cooler and the low-temperature re-cooler are sequentially arranged along the direction from the condenser to the expansion valve, the supplementary cooler comprises a supplementary cooler compressor, a supplementary cooler condenser, a supplementary cooler expansion valve and a supplementary cooler evaporator which are sequentially connected, the supplementary cooler compressor, the supplementary cooler condenser, the supplementary cooler expansion valve and the supplementary cooler evaporator are connected to form a refrigeration loop, and the supplementary cooler evaporator is connected to the pipeline between the condenser and the expansion valve of the refrigeration unit.

[0008] The multi-effect condensation, freezing, crystallization and high-salt water treatment system of the present invention, wherein the liquid crystal separator comprises a cylinder, an upper end cover is provided at the upper end of the cylinder, a base is provided at the lower end of the cylinder, an ice ejector is provided at the upper end of the cylinder, and the ice ejector comprises a motor, a transmission shaft and fan blades, the motor is fixedly arranged on the upper end cover, the transmission shaft and the fan blades are both located in the cylinder, the transmission shaft is rotatably mounted on the upper end cover, the upper end of the transmission shaft passes through the upper end cover and extends outside the cylinder, the output shaft of the motor is connected to the upper end of the transmission shaft and drives the transmission shaft to rotate, The fan blades are fixedly provided at the lower end of the transmission shaft, an ice discharge port arranged corresponding to the fan blades is opened on the cylinder wall of the cylinder body, the ice discharge port is connected to the sixth pipeline, a conical funnel is fixedly provided at the lower part of the cylinder body, the conical funnel and the cylinder body are coaxially arranged, the caliber of the conical funnel gradually decreases from top to bottom, the inlet of the conical funnel is located above the leakage port, the inlet of the conical funnel is sealed with the inner cylinder wall of the cylinder body, the leakage port is connected to the third pipeline, and the third pipeline passes through the cylinder wall of the cylinder body and extends to the outside of the cylinder body.

[0009] The multi-effect condensation, freezing and crystallization high-salt water treatment system of the present invention, wherein a drain outlet is provided on the cylinder wall of the cylinder, the drain outlet is located above the conical funnel, the drain outlet is connected to the fifth pipeline, the fifth pipeline is provided with a brine valve, and a slurry inlet is provided on the cylinder wall of the cylinder, the slurry inlet is located above the drain outlet, the slurry inlet is connected to the second pipeline, and the second pipeline is provided with a slurry inlet valve.

[0010] The invention discloses a multi-effect condensation, freezing, crystallization and high-salt water treatment system, wherein a first sprocket is fixedly provided on the output shaft of the motor, a second sprocket is fixedly provided on the upper end of the transmission shaft, and the first sprocket and the second sprocket are driven by a chain.

[0011] The multi-effect condensation, freezing and crystallization high-salt water treatment system of the present invention, wherein a first gear is fixedly provided on the output shaft of the motor, a second gear is fixedly provided on the upper end of the transmission shaft, and the first gear and the second gear are meshed with each other.

[0012] The present invention discloses a multi-effect condensation, freezing and crystallization high-salt water treatment system, wherein the cleaning nozzle comprises a nozzle body in a barrel shape, the inner diameter of the nozzle body gradually decreases from the barrel bottom to the barrel mouth, a support plate is fixedly provided at the barrel mouth of the nozzle body, a flow hole is provided at the edge of the support plate, a sealing plate is provided in the barrel cavity of the nozzle body, the sealing plate is located below the support plate, a spring is connected between the sealing plate and the support plate, a spray hole is provided at the barrel bottom of the nozzle body, and the barrel mouth of the nozzle body is fixedly connected to one end of the cleaning pipeline.

[0013] The present invention provides a multi-effect condensation, freezing, crystallization and high-salt water treatment system, wherein the upper end of the spring is fixedly connected to the middle of the bottom surface of the support plate, the lower end of the spring is fixedly connected to the middle of the top surface of the sealing plate, a sleeve is provided on the periphery of the spring, the upper end of the sleeve is fixedly connected to the middle of the bottom surface of the support plate, the lower end of the sleeve is fixedly connected to the middle of the top surface of the sealing plate, and the sleeve is made of elastic waterproof material.

[0014] The multi-effect condensation freezing crystallization high-salt water treatment system of the present invention, wherein a sealing ring is provided at the edge of the sealing plate, a threaded barrel is fixedly connected to the barrel mouth of the nozzle body, and the threaded barrel is threadedly connected to one end of the cleaning pipeline.

[0015] The multi-effect condensation freezing crystallization high-salt water treatment system of the present invention is different from the prior art in that when the present invention is in use, the brine enters the ice crystal generator from the brine tank under the push of the water supply pump, and in the ice crystal generator, the brine exchanges heat with the refrigerant in the evaporator, that is, the brine transfers its own heat to the refrigerant, and after the brine releases heat, the temperature drops to the freezing point of water, and ice is crystallized and precipitated, and the salt content in the brine increases to saturation. When the brine continues to cool to the salt-water eutectic point in the ice crystal generator, ice and crystal salt are precipitated in the ice crystal generator at the same time, and a fluid composed of salt crystals, ice crystals and saturated brine enters the liquid crystal separator. Due to the different densities of ice crystals and salt crystals, the ice crystals have a density less than the brine density and float up and are discharged from the upper outlet of the liquid crystal separator as fluid ice (with a water content of 40%-50%); the salt crystals have a density greater than the brine density and sink, and are discharged from the lower outlet of the liquid crystal separator as a mixture of brine and crystal salt, and enter the salt dehydrator to separate the crystal salt and the brine, and the dehydrated salt is collected and the separated brine flows back to the brine tank. The fluid ice flowing out of the upper outlet of the liquid crystal separator enters the ice crystal dehydrator for dehydration and salt washing. The separated brine flows back to the brine tank, and then the separated ice crystals are cleaned with clean water in the ice melt recovery tank. The cleaned water is discharged into the brine tank, and the clean ice crystals enter the ice melt recovery tank. The ice in the ice melt recovery tank is converted into water after heat exchange in the condenser of the refrigeration unit (that is, the ice absorbs the heat of the refrigerant in the condenser), and is discharged to meet the Class III surface water discharge standard. The brine in the middle of the liquid crystal separator is discharged into the brine tank through the fifth pipeline. It can be seen that the multi-effect condensation, freezing, crystallization and high-salt water treatment system of the present invention has the advantages of low energy consumption, easy maintenance and stable operation.

[0016] The present invention will be further described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the multi-effect condensation, freezing and crystallization high-salt water treatment system of the present invention;

[0018] Figure 2A diagram showing the relative positions of the liquid crystal separator, salt dehydrator, ice crystal dehydrator, brine tank and ice melt recovery tank in the present invention;

[0019] Figure 3 It is a usage state diagram of the liquid crystal separator, salt dehydrator, ice crystal dehydrator, brine tank and ice melting recovery tank in the present invention;

[0020] Figure 4 It is a structural schematic diagram of the liquid crystal separator in the present invention;

[0021] Figure 5 is a schematic diagram of the internal structure of the liquid crystal separator in the present invention;

[0022] Figure 6 This is a diagram showing the use state of the liquid crystal separator in the present invention;

[0023] Figure 7 It is a structural schematic diagram of the ice ejector in the present invention;

[0024] Figure 8 This is a front view of the cleaning nozzle of the present invention;

[0025] Fig. 9 A top view of the cleaning nozzle of the present invention;

[0026] Fig.10 A bottom view of the cleaning nozzle of the present invention;

[0027] Fig.11 It is a front cross-sectional view of the cleaning nozzle of the present invention when it is closed;

[0028] Fig.12 This is a front cross-sectional view of the cleaning nozzle of the present invention when it is opened. DETAILED DESCRIPTION

[0029] like Figure 1 As shown, combined with Figure 2-12As shown, the multi-effect condensation freezing crystallization high-salt water treatment system of the present invention comprises a brine tank 12 and an ice melting recovery tank 28, wherein the brine tank 12 is connected to an ice crystal generator 15 via a first pipeline 14, a water supply pump 13 is provided on the first pipeline 14, the ice crystal generator 15 is connected to a liquid crystal separator 17 via a second pipeline 16, the lower part of the liquid crystal separator 17 is connected to a salt dehydrator 23 via a third pipeline 22, the water outlet of the salt dehydrator 23 is connected to the brine tank 12 via a fourth pipeline 24, the middle part of the liquid crystal separator 17 is connected to the brine tank 12 via a fifth pipeline 21, and the The upper part of the liquid crystal separator 17 is connected to the ice crystal dehydrator 19 through the sixth pipeline 18, and the ice crystal dehydrator 19 is connected to the brine tank 12 through the seventh pipeline 20. A cleaning pipeline 26 is connected between the ice crystal dehydrator 19 and the ice melt recovery tank 28, and a cleaning pump 25 is provided on the cleaning pipeline 26. The discharge port of the ice crystal dehydrator 19 is located above the ice melt recovery tank 28. A refrigeration unit is connected between the ice crystal generator 15 and the ice melt recovery tank 28. The evaporator 1 of the refrigeration unit is located in the ice crystal generator 15, and the condenser 3 of the refrigeration unit is located in the ice melt recovery tank 28.

[0030] The salt dehydrator 23 and the ice crystal dehydrator 19 belong to the prior art. The dehydrator is provided with an inlet, a water outlet and a material discharge port. The water-containing material enters the dehydrator from the inlet. After dehydration, the dry material is discharged from the material discharge port, and the water separated from the material is discharged from the water outlet.

[0031] It should be noted that the refrigeration unit belongs to the prior art, which includes a compressor 2, a condenser 3, an expansion valve 4 and an evaporator 1. The compressor 2, the condenser 3, the expansion valve 4 and the evaporator 1 are connected to form a refrigeration loop through a pipeline. As for the specific refrigeration principle, it will not be repeated here. The ice crystal generator 15 is also a prior art, which includes a cavity structure, the cavity structure is used to accommodate high salt water, the upper end of the cavity structure is provided with an upper outlet, the upper outlet is connected to the second pipeline 16, and the lower end of the cavity structure is provided with a lower outlet, the lower outlet is connected to the first pipeline 14. The evaporator 1 of the refrigeration unit is arranged in the cavity structure of the ice crystal generator 15.

[0032] like Figure 1As shown, when the present invention is in use, the brine enters the ice crystal generator 15 from the brine tank 12 under the push of the water supply pump 13. In the ice crystal generator 15, the brine exchanges heat with the refrigerant in the evaporator 1, that is, the brine transfers its own heat to the refrigerant. After the brine releases heat, the temperature drops to the freezing point of water, and ice is crystallized. The salt content in the brine increases to saturation. When the brine continues to cool down in the ice crystal generator 15 to the eutectic point of salt and water, ice and crystal salt are precipitated in the ice crystal generator 15 at the same time, and the salt crystals are The fluid composed of ice crystals, ice crystals and saturated salt water enters the liquid crystal separator 17. Due to the different densities of ice crystals and salt crystals, the ice crystals have a density less than that of salt water and float upward and are discharged from the upper outlet of the liquid crystal separator 17 as fluid ice (water content of 40%-50%); the salt crystals have a density greater than that of salt water and sink downward, and are discharged from the lower outlet of the liquid crystal separator 17 as a mixture of salt water and crystal salt and enter the salt dehydrator 23 to separate the crystal salt from the salt water. The dehydrated salt is collected and the separated salt water flows back to the salt water tank 12. The fluid ice flowing out of the upper outlet of the liquid crystal separator 17 enters the ice crystal dehydrator 19 to dehydrate and wash the salt. The separated salt water flows back to the salt water tank 12. Then, the separated ice crystals are washed with clean water in the ice melting recovery tank 28. The washed water is discharged into the salt water tank 12, and the clean ice crystals enter the ice melting recovery tank 28. The ice in the ice melting recovery tank 28 is converted into water after heat exchange in the condenser 3 of the refrigeration unit (i.e., the ice absorbs the heat of the refrigerant in the condenser 3), and is discharged to meet the Class III surface water discharge standard. The brine in the middle of the liquid crystal separator 17 is discharged into the brine tank 12 through the fifth pipeline 21. It can be seen that the multi-effect condensation, freezing, crystallization, and high-salt water treatment system of the present invention has the advantages of low energy consumption, easy maintenance, and stable operation.

[0033] like Figure 1 As shown, a water supply pipe 11 is connected to the brine tank 12, and an ice melter 10 is connected to the water supply pipe 11, and the ice melter 10 is located in an ice melt recovery tank 28. The ice melt recovery tank 28 includes a first tank 29 and a second tank 30 that are interconnected, the discharge port of the ice crystal dehydrator 19 is located above the first tank 29, the ice melter 10 is located in the first tank 29, the condenser 3 of the refrigeration unit is located in the second tank 30, one end of the cleaning pipeline 26 is connected to the top of the ice crystal dehydrator 19 and extends into the ice crystal dehydrator 19, the other end of the cleaning pipeline 26 is connected to the second tank 30, one end of the cleaning pipeline 26 is connected to a cleaning nozzle 27, and the cleaning nozzle 27 is located in the ice crystal dehydrator 19. For the convenience of drainage, a clean water outlet is provided on the second tank 30.

[0034] The structure of the ice melter 10 is a heat exchanger, and the water supply pipe 11 is used to add high-salt water to the brine tank 12. When the high-salt water flows through the ice melter 10, the high-salt water exchanges heat with the ice and / or water in the ice melt recovery tank 28, that is, the high-salt water transfers heat to the ice and / or water in the ice melt recovery tank 28.

[0035] like Figure 1 As shown, a supplementary cooler and a low-temperature recooler 5 are sequentially connected to the pipeline between the condenser 3 and the expansion valve 4 of the refrigeration unit. The supplementary cooler and the low-temperature recooler 5 are sequentially arranged along the direction from the condenser 3 to the expansion valve 4. The supplementary cooler includes a supplementary cooler compressor 6, a supplementary cooler condenser 7, a supplementary cooler expansion valve 8 and a supplementary cooler evaporator 9 which are sequentially connected. The supplementary cooler compressor 6, the supplementary cooler condenser 7, the supplementary cooler expansion valve 8 and the supplementary cooler evaporator 9 are connected to form a refrigeration loop. The supplementary cooler is a refrigeration loop formed by connecting the supplementary cooler compressor 6, the supplementary cooler condenser 7, the supplementary cooler expansion valve 8 and the supplementary cooler evaporator 9. The refrigeration principle thereof will not be described in detail. The refrigerant in the supplementary cooler exchanges heat with the refrigerant in the refrigeration unit when flowing through the supplementary cooler evaporator 9, that is, the refrigerant in the supplementary cooler absorbs the heat of the refrigerant in the refrigeration unit. The structure of the low-temperature subcooler 5 is an air-cooled heat exchanger. When the refrigerant in the refrigeration unit flows through the low-temperature subcooler 5, the fan drives the air to flow through the low-temperature subcooler 5 to exchange heat with the refrigerant in the refrigeration unit, that is, the air absorbs the heat of the refrigerant in the refrigeration unit.

[0036] like Figure 2 As shown, combined with Figure 3-7 As shown, the liquid crystal separator 17 includes a cylinder 34, an upper end cover 32 is provided at the upper end of the cylinder 34, a base 39 is provided at the lower end of the cylinder 34, an ice ejector 31 is provided at the upper end of the cylinder 34, and the ice ejector 31 includes a motor 40, a transmission shaft 41 and a fan blade 42. The motor 40 is fixedly mounted on the upper end cover 32, the transmission shaft 41 and the fan blade 42 are both located in the cylinder 34, the transmission shaft 41 is rotatably mounted on the upper end cover 32, the upper end of the transmission shaft 41 passes through the upper end cover 32 and extends to the outside of the cylinder 34, the output shaft of the motor 40 is connected to the upper end of the transmission shaft 41 and drives the transmission shaft 41 to rotate, the fan blade 42 is fixedly provided at the lower end of the transmission shaft 41, an ice ejector port 33 arranged corresponding to the fan blade 42 is opened on the cylinder wall of the cylinder 34, and the ice ejector port 33 is connected to the sixth pipeline 18.

[0037] The motor 40 is fixed on the upper end cover 32 through the support frame 44, and the transmission shaft 41 is rotatably installed on the upper end cover 32 through the bearing. The fan blades 42 are provided in plurality, and the plurality of fan blades 42 are evenly arranged along the circumference of the transmission shaft 41. Of course, the number of fan blades 42 can be determined according to actual conditions.

[0038] When the ice ejector 31 is working, the motor 40 is started, and the motor 40 drives the transmission shaft 41 to rotate, so that the fan blades 42 fixed on the transmission shaft 41 also rotate with the transmission shaft 41. As mentioned above, since the density of ice crystals is less than the density of brine and they float to the surface of the brine, when ice slurry (i.e., a fluid composed of salt crystals, ice crystals and saturated brine) is filled into the liquid crystal separator 17, the brine surface in the cylinder 34 is made consistent with the height of the fan blades 42. In this way, the rotating fan blades 42 can sweep the mixture of ice crystals and brine to the ice ejection port 33 and discharge it, and the discharged mixture of ice crystals and brine enters the ice crystal dehydrator 19 through the sixth pipeline 18.

[0039] In the ice crystal dehydrator 19, after the mixture of ice crystals and brine is processed by the ice crystal dehydrator 19, the brine enters the brine tank 12 from the water outlet of the ice crystal dehydrator 19 through the seventh pipeline 20, and the ice crystals remain in the ice crystal dehydrator 19. Then, the cleaning pump 25 is started. Under the action of the cleaning pump 25, the clean water in the ice melt recovery tank 28 enters the ice crystal dehydrator 19 through the cleaning pipeline 26 to clean the ice crystals (i.e., salt washing operation). The cleaned water then enters the brine tank 12 through the seventh pipeline 20. Finally, the clean ice crystals are discharged from the discharge port of the ice crystal dehydrator 19. Since the first tank 29 of the ice melt recovery tank 28 is located below the discharge port of the ice crystal dehydrator 19, the ice crystals discharged from the discharge port of the ice crystal dehydrator 19 directly fall into the first tank 29 of the ice melt recovery tank 28.

[0040] like Figure 3 As shown, combined with Figure 5 , 6 As shown, a conical funnel 43 is fixedly provided at the lower part of the cylinder 34, the conical funnel 43 and the cylinder 34 are coaxially arranged, the caliber of the conical funnel 43 gradually decreases from top to bottom, the inlet of the conical funnel 43 is located above the leakage port, the inlet of the conical funnel 43 is sealedly connected to the inner cylinder wall of the cylinder 34, the leakage port is connected to the third pipeline 22, the third pipeline 22 passes through the cylinder wall of the cylinder 34 and extends to the outside of the cylinder 34, and then the third pipeline 22 is connected to the salt dehydrator 23.

[0041] Since the density of salt crystals is greater than that of brine, the salt crystals in the cylinder 34 are precipitated into the conical funnel 43, and then the mixture of salt crystals and brine can be discharged to the salt dehydrator 23 through the third pipeline 22. After being processed by the salt dehydrator 23, the salt crystals are discharged from the discharge port of the salt dehydrator 23 and collected, and the brine is discharged from the water outlet of the salt dehydrator 23 and enters the brine tank 12 through the fourth pipeline 24.

[0042] A drain port 37 is provided on the wall of the cylinder 34, and the drain port 37 is located above the conical funnel 43. The drain port 37 is connected to the fifth pipeline 21, and the fifth pipeline 21 is provided with a brine valve 38. The brine in the cylinder 34 enters the brine tank 12 from the drain port 37 through the fifth pipeline 21. The opening of the brine valve 38 is adjusted to ensure the distribution of ice crystals, salt crystals and brine in the cylinder 34, so that ice is discharged from the upper part of the cylinder 34, brine is discharged from the middle part, and salt is discharged from the lower part. A slurry inlet 35 is provided on the wall of the cylinder 34, and the slurry inlet 35 is located above the drain port 37. The slurry inlet 35 is connected to the second pipeline 16, and the second pipeline 16 is provided with a slurry inlet valve 36.

[0043] like Figure 7 As shown, a first sprocket is fixedly provided on the output shaft of the motor 40, a second sprocket is fixedly provided on the upper end of the transmission shaft 41, and the first sprocket and the second sprocket are transmitted through a chain 45. The motor 40 drives the transmission shaft 41 to rotate through the sprocket and the chain 45. Of course, the motor 40 can also drive the transmission shaft 41 to rotate through a gear, specifically: a first gear is fixedly provided on the output shaft of the motor 40, a second gear is fixedly provided on the upper end of the transmission shaft 41, and the first gear and the second gear are meshed with each other.

[0044] like Figure 8 As shown, combined with Figure 9-12 As shown, the cleaning nozzle 27 includes a nozzle body 46 in a barrel shape, the inner diameter of the nozzle body 46 gradually decreases from the barrel bottom to the barrel mouth, a support plate 49 is fixedly provided at the barrel mouth of the nozzle body 46, a flow hole 48 is provided at the edge of the support plate 49, a sealing plate 54 is provided in the barrel cavity of the nozzle body 46, the sealing plate 54 is located below the support plate 49, a spring 53 is connected between the sealing plate 54 and the support plate 49, a spray hole 50 is provided at the barrel bottom of the nozzle body 46, and the barrel mouth of the nozzle body 46 is fixedly connected to one end of the cleaning pipeline 26.

[0045] When the cleaning nozzle 27 is not in use, the spring 53 has a pre-tightening tension. Under the tension of the spring 53, the blocking plate 54 is tightly attached to the inner wall of the barrel cavity of the nozzle body 46, thereby dividing the barrel cavity into two upper and lower sealed and isolated spaces. When the cleaning nozzle 27 is in use, water enters the barrel cavity of the nozzle body 46 from the flow hole 48 of the support plate 49, and then under the action of water pressure, the water pushes the blocking plate 54 to move downward (the spring 53 is stretched at this time). Since the inner diameter of the barrel cavity gradually increases from top to bottom, when the blocking plate 54 moves downward, an annular gap appears between the blocking plate 54 and the barrel cavity. This annular gap connects the upper and lower spaces of the barrel cavity, so that water passes through the annular gap from the upper space of the barrel cavity into the lower space, and then sprays out from the spray hole 50 at the bottom of the barrel. After the water spraying is finished, the water source is turned off, the water pressure disappears, and the blocking plate 54 moves upward under the pulling force of the spring 53 until it is close to the inner wall of the barrel cavity again (the spring 53 is restored at this time). In this way, it is possible to prevent dust and other debris from entering the pipeline through the cleaning nozzle 27 and causing blockage.

[0046] The upper end of the spring 53 is fixedly connected to the middle of the bottom surface of the support plate 49, and the lower end of the spring 53 is fixedly connected to the middle of the top surface of the blocking plate 54. A sleeve 51 is provided on the periphery of the spring 53, and the upper end of the sleeve 51 is fixedly connected to the middle of the bottom surface of the support plate 49, and the lower end of the sleeve 51 is fixedly connected to the middle of the top surface of the blocking plate 54. The sleeve 51 is made of elastic waterproof material. Since the upper end of the sleeve 51 is fixedly connected to the middle of the bottom surface of the support plate 49, and the flow hole 48 is provided at the edge of the support plate 49, the water flow entering the barrel cavity from the flow hole 48 will only flow on the outside of the sleeve 51. In this way, under the protection of the sleeve 51, the spring 53 will not come into contact with the water flow, thereby preventing the spring 53 from being corroded by the water flow and extending the service life of the spring 53.

[0047] A sealing ring 52 is provided at the edge of the sealing plate 54 , which can further enhance the sealing performance between the sealing plate 54 and the inner wall of the barrel cavity of the nozzle body 46 .

[0048] A threaded barrel 47 is fixedly connected to the barrel opening of the nozzle body 46, and the threaded barrel 47 is threadedly connected to one end of the cleaning pipeline 26. Of course, the nozzle body 46 can also be connected to the end of the cleaning pipeline 26 by other connection methods, such as welding, interference fit, etc.

[0049] like Figure 1 As shown, the freezing crystallization refrigeration process of the refrigeration unit in the present invention has the following two working conditions:

[0050] Working condition 1: When the outdoor ambient temperature is higher than the evaporation temperature of the refrigeration unit, the compressor 2 works to discharge the high-temperature and high-pressure gaseous refrigerant into the condenser 3 in the ice-melting recovery tank 28. In the condenser 3, most of the refrigerant is liquefied and releases heat, melting the ice in the ice-melting recovery tank 28 into water, and recovering the cold therein. Then the supplementary cooler is started, and the supplementary cooler compressor 6 works to make the high-temperature and high-pressure gaseous refrigerant in the supplementary cooler release heat and liquefy through the supplementary cooler condenser 7, and then cut off through the supplementary cooler expansion valve 8, and then to the supplementary cooler evaporator 9 to evaporate and absorb heat. The gas-liquid mixed refrigerant of the refrigeration unit flows into the supplementary cooler evaporator 9 to supplement cool and liquefy again. Then the liquid refrigerant of the refrigeration unit flows directly to the expansion valve 4 to cut off, and then to the evaporator 1 in the ice crystal generator 15 to evaporate and absorb heat and gasify. Then the low-temperature and low-pressure gaseous refrigerant of the refrigeration unit is discharged through the work of the compressor 2 to complete the heat release refrigeration cycle.

[0051] Working condition 2: When the outdoor ambient temperature is lower than the evaporation temperature of the refrigeration unit, the compressor 2 performs work, and discharges high-temperature and high-pressure gaseous refrigerant into the condenser 3 in the ice-melting recovery tank 28. In the condenser 3, most of the refrigerant is liquefied and releases heat, and the ice in the ice-melting recovery tank 28 is melted into water, and the cold capacity thereof is recovered. The supplementary cooler is closed, and the gas-liquid mixed refrigerant of the refrigeration unit flows through the supplementary cooler evaporator 9 and enters the low-temperature recooler 5, taking cold and releasing heat from the outdoor low-temperature air, completing the complete liquefaction of the refrigerant. The liquid refrigerant flows to the expansion valve 4 for interception, and evaporates and absorbs heat in the evaporator 1 in the ice crystal generator 15, and is then discharged by the compressor 2 to complete the heat release refrigeration cycle.

[0052] It should be noted that in the above two working conditions, after flowing through the supplementary cooler, the refrigerant of the refrigeration unit can be adjusted by the valve to flow directly to the expansion valve 4 or flow through the low-temperature recooler 5 before flowing to the expansion valve 4.

[0053] like Figure 1As shown, when the present invention is in use, the brine enters the ice crystal generator 15 from the brine tank 12 under the push of the water supply pump 13. In the ice crystal generator 15, the brine exchanges heat with the refrigerant in the evaporator 1, that is, the brine transfers its own heat to the refrigerant. After the brine releases heat, the temperature drops to the freezing point of water, and ice is crystallized. The salt content in the brine increases to saturation. When the brine continues to cool down in the ice crystal generator 15 to the eutectic point of salt and water, ice and crystal salt are precipitated in the ice crystal generator 15 at the same time, and the salt crystals are The fluid composed of ice crystals, ice crystals and saturated salt water enters the liquid crystal separator 17. Due to the different densities of ice crystals and salt crystals, the ice crystals have a density less than that of salt water and float upward and are discharged from the upper outlet of the liquid crystal separator 17 as fluid ice (water content of 40%-50%); the salt crystals have a density greater than that of salt water and sink downward, and are discharged from the lower outlet of the liquid crystal separator 17 as a mixture of salt water and crystal salt and enter the salt dehydrator 23 to separate the crystal salt from the salt water. The dehydrated salt is collected and the separated salt water flows back to the salt water tank 12. The fluid ice flowing out of the upper outlet of the liquid crystal separator 17 enters the ice crystal dehydrator 19 to dehydrate and wash the salt. The separated salt water flows back to the salt water tank 12. Then, the separated ice crystals are washed with clean water in the ice melting recovery tank 28. The washed water is discharged into the salt water tank 12, and the clean ice crystals enter the ice melting recovery tank 28. The ice in the ice-melting recovery tank 28 is converted into water after heat exchange in the condenser 3 of the refrigeration unit (i.e., the ice absorbs the heat of the refrigerant in the condenser 3), and is discharged to meet the Class III surface water discharge standard. The brine in the middle of the liquid crystal separator 17 is discharged into the brine tank 12 through the fifth pipeline 21. When the water supply pipe 11 replenishes the brine tank 12 with normal temperature brine, the brine at normal temperature exchanges heat with the ice and / or water in the ice-melting recovery tank 28 when flowing through the ice melter 10, and the normal temperature brine recovers the cold in the ice water. After that, the temperature of the supplementary brine at normal temperature drops to nearly 0 degrees and enters the brine tank 12, thereby reducing the cold of the refrigeration unit used for sensible heat cooling of the brine, so that the refrigeration unit can directly use the cold for the crystallization refrigeration of the brine, thereby improving the high brine treatment efficiency of the system. It can be seen that the multi-effect condensation, freezing, crystallization, and high brine treatment system of the present invention has the advantages of low energy consumption, easy maintenance, and stable operation.

[0054] It should be noted that the directions or positional relationships indicated by terms such as “center”, “up”, “down”, “front”, “back”, “left”, “right”, and “middle” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0055] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] The embodiments described above are merely descriptions of preferred implementation modes of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A multi-effect condensation, freezing and crystallization high-salt water treatment system, characterized by: The invention comprises a brine tank and an ice-melting recovery tank, wherein the brine tank is connected to an ice crystal generator through a first pipeline, a water supply pump is arranged on the first pipeline, the ice crystal generator is connected to a liquid crystal separator through a second pipeline, the lower part of the liquid crystal separator is connected to a salt dehydrator through a third pipeline, the water outlet of the salt dehydrator is connected to the brine tank through a fourth pipeline, the middle part of the liquid crystal separator is connected to the brine tank through a fifth pipeline, the upper part of the liquid crystal separator is connected to the ice crystal dehydrator through a sixth pipeline, the ice crystal dehydrator is connected to the brine tank through a seventh pipeline, a cleaning pipeline is connected between the ice crystal dehydrator and the ice-melting recovery tank, a cleaning pump is arranged on the cleaning pipeline, the discharge port of the ice crystal dehydrator is located above the ice-melting recovery tank, a refrigeration unit is connected between the ice crystal generator and the ice-melting recovery tank, the evaporator of the refrigeration unit is located in the ice crystal generator, and the condenser of the refrigeration unit is located in the ice-melting recovery tank, The ice melting recovery tank includes a first tank and a second tank which are interconnected. One end of the cleaning pipeline is connected to the top of the ice crystal dehydrator and extends into the ice crystal dehydrator. The other end of the cleaning pipeline is connected to the second tank. One end of the cleaning pipeline is connected to a cleaning nozzle, which is located in the ice crystal dehydrator. The cleaning nozzle comprises a nozzle body in a barrel shape, the inner diameter of the nozzle body gradually decreases from the barrel bottom to the barrel mouth, a support plate is fixedly provided at the barrel mouth of the nozzle body, a flow hole is provided at the edge of the support plate, a blocking plate is provided in the barrel cavity of the nozzle body, the blocking plate is located below the support plate, a spring is connected between the blocking plate and the support plate, a spray hole is provided at the barrel bottom of the nozzle body, and the barrel mouth of the nozzle body is fixedly connected to one end of the cleaning pipeline, The brine tank is connected to a water supply pipe, the water supply pipe is connected to an ice melter, the ice melter is located in the ice melt recovery tank, the discharge port of the ice crystal dehydrator is located above the first tank, the ice melter is located in the first tank, and the condenser of the refrigeration unit is located in the second tank. A supplementary cooling device and a low-temperature recooler are sequentially connected to the pipeline between the condenser and the expansion valve of the refrigeration unit. The supplementary cooling device and the low-temperature recooler are sequentially arranged along the direction from the condenser to the expansion valve. The supplementary cooling device includes a supplementary cooling compressor, a supplementary cooling condenser, a supplementary cooling expansion valve and a supplementary cooling evaporator which are sequentially connected. The supplementary cooling compressor, the supplementary cooling condenser, the supplementary cooling expansion valve and the supplementary cooling evaporator are connected to form a refrigeration loop. The supplementary cooling evaporator is connected to the pipeline between the condenser and the expansion valve of the refrigeration unit.

2. The multi-effect condensation, freezing and crystallization high-salt water treatment system according to claim 1 is characterized by: The liquid crystal separator comprises a cylinder, an upper end cover is provided at the upper end of the cylinder, a base is provided at the lower end of the cylinder, an ice ejector is provided at the upper end of the cylinder, the ice ejector comprises a motor, a transmission shaft and a fan blade, the motor is fixedly arranged on the upper end cover, the transmission shaft and the fan blade are both located in the cylinder, the transmission shaft is rotatably mounted on the upper end cover, the upper end of the transmission shaft passes through the upper end cover and extends outside the cylinder, the output shaft of the motor is connected to the upper end of the transmission shaft and drives the transmission shaft to rotate, the lower end of the transmission shaft is fixedly arranged The cylinder body has the fan blades, and an ice discharge port arranged corresponding to the fan blades is opened on the cylinder wall of the cylinder body, and the sixth pipeline is connected to the ice discharge port. A conical funnel is fixedly provided at the lower part of the cylinder body, and the conical funnel and the cylinder body are coaxially arranged. The diameter of the conical funnel gradually decreases from top to bottom, and the inlet of the conical funnel is located above the leakage port. The inlet of the conical funnel is sealed with the inner cylinder wall of the cylinder body, and the leakage port is connected to the third pipeline, and the third pipeline passes through the cylinder wall of the cylinder body and extends to the outside of the cylinder body.

3. The multi-effect condensation freezing crystallization high salt water treatment system according to claim 2 is characterized in that: A drain port is provided on the wall of the cylinder, the drain port is located above the conical funnel, the drain port is connected to the fifth pipeline, the fifth pipeline is provided with a brine valve, a slurry inlet is provided on the wall of the cylinder, the slurry inlet is located above the drain port, the slurry inlet is connected to the second pipeline, and the second pipeline is provided with a slurry inlet valve.

4. The multi-effect condensation, freezing and crystallization high-salt water treatment system according to claim 3 is characterized by: A first sprocket is fixedly provided on the output shaft of the motor, a second sprocket is fixedly provided on the upper end of the transmission shaft, and the first sprocket and the second sprocket are driven by a chain.

5. The multi-effect condensation freezing crystallization high salt water treatment system according to claim 3 is characterized in that: A first gear is fixedly provided on the output shaft of the motor, a second gear is fixedly provided on the upper end of the transmission shaft, and the first gear and the second gear are meshed with each other.

6. The multi-effect condensation, freezing, crystallization and high-salt water treatment system according to claim 4 or 5, characterized in that: The upper end of the spring is fixedly connected to the middle part of the bottom surface of the support plate, and the lower end of the spring is fixedly connected to the middle part of the top surface of the blocking plate. A sleeve is provided on the periphery of the spring, and the upper end of the sleeve is fixedly connected to the middle part of the bottom surface of the support plate, and the lower end of the sleeve is fixedly connected to the middle part of the top surface of the blocking plate. The sleeve is made of elastic waterproof material.

7. The multi-effect condensation freezing crystallization high salt water treatment system according to claim 6 is characterized in that: A sealing ring is provided at the edge of the blocking plate, and a threaded barrel is fixedly connected to the barrel mouth of the nozzle body, and the threaded barrel is threadedly connected to one end of the cleaning pipeline.

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