Low-temperature crystallization drying device adopting heat pump technology and used for high-salinity wastewater treatment
The low-temperature crystallization and drying device using heat pump technology solves the problems of biological and membrane methods in the treatment of high-salt wastewater, realizes low-temperature salt precipitation and pulverization, reduces energy consumption and operating costs, simplifies system management, and is suitable for the treatment of high-salt wastewater.
Patent Information
- Application Number
- CN202423275915.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-12-16
- Estimated Expiration
- 2034-12-30
AI Technical Summary
Existing high-salinity wastewater treatment technologies suffer from problems such as difficulty in biological treatment, easy fouling and high energy consumption of membrane methods, and high investment, complex operation and easy clogging of existing thermal treatment methods.
The low-temperature crystallization drying device using heat pump technology utilizes components such as reagent tanks, concentrated brine tanks, mixed solution tanks, crystallization growth tanks, and drying chambers. It uses heat pumps to provide low-temperature hot air to dry the crystallized salt, and combines it with equipment such as mesh belt conveyors and scrapers to achieve low-temperature salt precipitation and pulverization, reducing energy consumption and preventing blockages.
It enables low-temperature salt precipitation treatment of high-salinity wastewater, reducing treatment costs and energy consumption, minimizing the risk of system blockage, simplifying management, and is applicable to the treatment of various inorganic salts.
Smart Images
Figure CN223674349U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to high salt wastewater treatment technical field, specifically, the utility model relates to a kind of low temperature crystallization drying device for high salt wastewater treatment using heat pump technology. BACKGROUND
[0002] High salt wastewater refers to wastewater containing high concentration of salt and pollutants, and its production path is wide, such as desulfurization wastewater of coal-fired power plants, reverse osmosis concentrated water of chemical plants, etc. The water quantity also increases year by year. The treatment of such wastewater has always been a hot and difficult point in the field. In the existing treatment technology, the biodegradability of such wastewater is poor, and there are problems such as difficulty in culturing halophilic bacteria and treatment limit in biological method. The membrane method requires high water quality, and the membrane is easy to be contaminated. Generally, heat treatment is used, such as three-effect evaporator crystallization or MVR evaporation crystallization process to treat high salt wastewater, but there are also problems such as high basic investment, high operation energy consumption, complex management, easy to block and cannot continuous operation. SUMMARY
[0003] Therefore, the utility model provides a kind of low temperature crystallization drying device for high salt wastewater treatment using heat pump technology, to solve or at least alleviate the above problems existing in the prior art.
[0004] In order to achieve the foregoing purpose, the utility model provides a kind of low temperature crystallization drying device for high salt wastewater treatment using heat pump technology, comprising: a medicament tank, a concentrated brine tank and a drying box body, the medicament tank and the concentrated brine tank are respectively connected with a mixed solution tank through pipeline, the mixed solution tank is connected with a crystallization growth tank through pipeline, the crystallization growth tank is connected with the feed inlet on one side of the drying box body through pipeline, the output end of the feed inlet is connected with a distributor, the discharge end of the distributor is located at one side of the top end in the drying box body, a plurality of net belt conveyors distributed upward and downward are installed in the drying box body, a crystalline salt outlet is provided at the bottom end of the drying box body, a switch valve is provided on the crystalline salt outlet, and a packaging device is connected with the outlet of the switch valve.
[0005] In the low temperature crystallization drying device for high salt wastewater treatment using heat pump technology as described above, optionally, a heat pump is provided on one side of the drying box body, an air blower is installed at the air outlet of the heat pump, an air outlet pipe is connected with the air outlet of the air blower, an air uniformizing plate is matched above the net belt conveyor, the air uniformizing plate is fixedly connected with the inner wall of the drying box body, a plurality of air outlets are provided on the bottom surface of the air uniformizing plate, an air outlet branch pipe for gas transmission is connected between the air outlet pipe and the air uniformizing plate, and a plurality of wet air outlets are provided on the drying box body.
[0006] In the low-temperature crystallization drying device for high-salinity wastewater treatment using heat pump technology as described above, optionally, an electric heating plate is arranged in the mesh belt ring of the mesh belt conveyor, the electric heating plate is installed on the inner wall of the drying box body, the discharge end of the mesh belt conveyor located above among the two adjacent mesh belt conveyors is located directly above the feeding end of the mesh belt conveyor located below, and the feeding end of the mesh belt conveyor located at the uppermost position is located directly below the discharge end of the distributor.
[0007] In the low-temperature crystallization drying device for high-salinity wastewater treatment using heat pump technology as described above, optionally, the wet air outlet at the top of the drying box body is connected to the inlet of a passage of a heat pump condenser through a pipeline, the outlet of the passage of the condenser is connected to a medicament recovery intermediate tank through a pipeline, and the medicament recovery intermediate tank is connected to the medicament tank through a pipeline.
[0008] In the low-temperature crystallization drying device for high-salinity wastewater treatment using heat pump technology as described above, optionally, the lower end of the drying box body is a trapezoidal funnel, a horizontal electric motor is installed on one side of the lower end of the drying box body, the output shaft of the electric motor penetrates the side wall of the drying box body and is connected to a horizontal rotating shaft, and a plurality of cutting blades are connected to the rotating shaft.
[0009] In the low-temperature crystallization drying device for high-salinity wastewater treatment using heat pump technology as described above, optionally, the liquid outlet of the drying box body is connected to a mixed solution tank through a pipeline, a scraper is attached to one side of the bottom of the discharge end of the mesh belt conveyor, the scraper is fixed to the inner wall of the drying box body, there are three mesh belt conveyors, the drying box body is a cuboid, the drying box body is fixed to the bottom surface through a support frame, and the drying box body is a closed micro-negative pressure structure.
[0010] In the low-temperature crystallization drying device for high-salinity wastewater treatment using heat pump technology as described above, optionally, the lower end of the drying box body is semicircular, discharge outlets are formed on both sides of the drying box body, a semicircular collection tank is arranged outside the bottom end of the drying box body, the collection tank blocks the discharge outlets, a crystalline salt outlet is arranged at the bottom end of the collection tank, an electric motor is installed on one side of the drying box body, a rotating rod is fixedly installed on the output shaft of the electric motor, a sliding groove is sleeved on the outer surface of the rotating rod, the sliding groove is slidingly installed on the outer wall of the drying box body, a driving rod is arranged in the middle of the sliding groove and slidingly installed in the other side of the sliding groove, a rotating shaft is rotatably installed at the center of the bottom end of the drying box body, the rotating shaft penetrates the outer wall of the drying box body at both ends, and the driving rod is fixedly installed on the rotating shaft.
[0011] In the low-temperature crystallization drying device for high-salt wastewater treatment using heat pump technology as described above, optionally, the rotating shaft is fixedly installed with a connecting rod at both ends inside the drying box, the bottom end of the connecting rod is fixedly installed with an extension plate, both ends of the extension plate are fixedly installed with a scraper, the center of the extension plate is fixedly installed with a brush, and the scraper and the brush are in contact with the inner wall of the drying box.
[0012] In the low-temperature crystallization drying device for high-salt wastewater treatment using heat pump technology as described above, optionally, both sides of the drying box are provided with baffles capable of shielding the discharge port, the bottom end of each baffle is fixedly installed with an arc-shaped rod, both sides of the drying box are fixedly installed with a sleeve inside, a strip-shaped slot is formed in the sleeve, the arc-shaped rod is slidingly installed in the sleeve, the arc-shaped rod is fixedly installed with a tooth, the first tooth is slidingly installed in the strip-shaped slot, and the end of the arc-shaped rod is fixedly installed with an arc-shaped spring inside the sleeve.
[0013] In the low-temperature crystallization drying device for high-salt wastewater treatment using heat pump technology as described above, optionally, the end of the sleeve is provided with a moving block, the moving block is fixedly installed with a second tooth at one end close to the arc-shaped rod, the second tooth is meshed with the first tooth, the bottom end of the moving block is fixedly installed with a poking rod in contact with the inner wall of the drying box, the end of the moving block away from the arc-shaped rod is provided with a connecting plate fixedly installed inside the drying box, a spring is fixedly installed between the connecting plate and the moving block, a limiting rod is fixedly installed on the moving block, and the limiting rod is slidingly installed on the connecting plate.
[0014] The low-temperature crystallization drying device for high-salt wastewater treatment using heat pump technology can dry the crystalline salt in the drying box through hot air, dry the crystalline salt in the drying box through a mesh belt conveyor, realize normal-temperature salt precipitation reagent treatment of high-salt wastewater, reduce treatment cost, effectively reduce energy consumption by using heat pump technology, reduce fouling and blockage of system pipelines, reduce operation and maintenance cost, occupy small area, can treat various inorganic salts, and the rotating shaft is rotatably installed at the bottom of the drying box, the rotating shaft rotates to dry and crush the crystalline salt, and the system management anti-blocking effect is better. BRIEF DESCRIPTION OF DRAWINGS
[0015] The disclosure of the present application will be more apparent with reference to the drawings. It should be understood that these drawings are only for illustrative purposes, and are not intended to limit the scope of protection of the present application. In the drawings:
[0016] Figure 1 It is a structural schematic view of the embodiment one of the present application.
[0017] Figure 2The embodiment two of the utility model discloses a drying box bottom structure schematic diagram.
[0018] Figure 3 The utility model discloses a Figure 2 Sectional view.
[0019] Figure 4 The utility model discloses a rotating shaft structure schematic diagram.
[0020] Figure 5 The utility model discloses a sleeve and baffle connection structure schematic diagram.
[0021] Fig. 1, medicament tank 2, concentrated brine tank 3, drying box body 3-1, discharge port 3-2, baffle 3-3, arc-shaped rod 3-4, first tooth 3-5, sleeve 3-6, strip-shaped groove 3-7, arc-shaped spring 4, mixed solution tank 5, crystallization growth tank 6, feed inlet 7, distributor 8, mesh belt conveyor 9, uniform wind plate 10, heat pump 11, air blower 12, air outlet 13, on-off valve 14, packaging equipment 15, medicament recovery intermediate tank 16, rotating shaft 16-1, driving rod 16-2, connecting rod 16-3, extension plate 16-4, scraper 16-5, brush 17, support frame 18, scraper 19, collection box 20, rotating rod 21, sliding slot 22, moving block 22-1, second tooth 22-2, poking rod 22-3, connecting plate 22-4, spring 22-5, limiting rod. DETAILED DESCRIPTION
[0022] The technical scheme in the embodiments of the utility model will be described clearly and completely below, and apparently, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.
[0023] As Figure 1 Shown in the embodiment one, a kind of low-temperature crystallization drying device for high-salinity wastewater treatment using heat pump technology, comprising: medicament tank 1, concentrated brine tank 2 and drying box body 3, medicament tank 1 and concentrated brine tank 2 are connected with mixed solution tank 4 by pipeline respectively, mixed solution tank 4 is connected with crystallization growth tank 5 by pipeline, crystallization growth tank 5 is connected on the feed inlet 6 of drying box body 3 side by pipeline, the output end of feed inlet 6 is connected with distributor 7, the discharge end of distributor 7 is located in the top end of one side in drying box body 3, several mesh belt conveyors 8 distributed up and down are installed in drying box body 3, crystalline salt outlet is equipped at drying box body 3 bottom end, on-off valve 13 is equipped on crystalline salt outlet, packaging equipment 14 is connected to the outlet of on-off valve 13.
[0024] In the organic solvent-electrolyte-water system, there are interactions between organic solvent molecules and water molecules and interactions between ions and water molecules, and the two interactions compete with each other. When the interaction between the organic solvent molecules and the water molecules is dominant, the number of water molecules interacting with the ions decreases, resulting in a decrease in the solubility of the electrolyte, and crystallization occurs. The organic solvent in the text is referred to as the agent;
[0025] Agent tank 1 preparation: The total amount of agent to be used should be 3-6 times the amount of concentrated brine to be treated per hour (i.e. for 1 m3 / h of concentrated brine, the total amount of agent to be used is 3-6 m3) to meet the amount of agent occupied in the system.
[0026] Delivery of agent and concentrated brine: The agent and concentrated brine are delivered to the mixing reaction tank through the metering pumps installed at the bottom of the tank in a ratio of agent: concentrated brine = 1.5:1. The mixing reaction time should be no less than 5 minutes to ensure uniform mixing and the formation of fine salt crystal grains in the mixed solution;
[0027] Crystallization growth process: The mixed solution containing fine crystal grains is delivered to the crystallization growth tank 5 through the metering pump installed at the bottom of the tank and left to stand for no less than 15 minutes to allow the crystal grains to grow to 0.2-0.5 mm. Subsequently, the mixed solution containing crystals is delivered to the feed inlet 6 by the diaphragm pump for drying;
[0028] One side of the drying box 3 is provided with a heat pump 10, and a blower 11 is installed at the air outlet 12 of the heat pump 10. The air outlet of the blower 11 is connected with an air outlet pipe. The upper part of the mesh belt conveyor 8 is matched with a hollow air uniformizing plate 9. The air uniformizing plate 9 is fixedly connected with the inner wall of the drying box 3, and the bottom surface of the air uniformizing plate 9 is provided with a plurality of air outlet holes. An air outlet branch pipe for gas transmission is connected between the air outlet pipe and the air uniformizing plate 9. A plurality of wet air outlets 12 are arranged on the drying box 3.
[0029] Drying process: The temperature of the drying box 3 is controlled at 60-67℃, so that the agent reaches the boiling point temperature and turns into gas phase, which is condensed by the condenser of the heat pump 10 through the wet air outlets 12 at the top of the drying box 3. The dilute brine from which the agent is removed flows into the bottom collection tank through the drying box 3, enters the mixed solution tank 4 through the pipeline, and can be used to preheat the mixed solution;
[0030] An electric heating plate is arranged in the mesh belt ring of the mesh belt conveyor 8. The electric heating plate is installed on the inner wall of the drying box 3. The discharge end of the mesh belt conveyor 8 located at the upper part of the adjacent two mesh belt conveyors 8 is located directly above the feeding end of the mesh belt conveyor 8 located at the lower part. The feeding end of the mesh belt conveyor 8 located at the uppermost part is located directly below the discharge end of the distributor 7.
[0031] The wet air outlet 12 at the top of the drying box 3 is connected to the condenser one passage inlet of the low-temperature heat pump 10 through a pipeline, the condenser one passage outlet is connected to the medicament recovery intermediate tank 15 through a pipeline, and the medicament recovery intermediate tank 15 is connected to the medicament tank 1 through a pipeline.
[0032] Medicament recovery: The gaseous medicament derived from the top of the drying box 3 is condensed into liquid phase by the condenser of the low-temperature heat pump 10 and enters the medicament recovery intermediate tank 15. Then, the medicament is recovered to the medicament tank 1 by pumping.
[0033] The lower end of the drying box 3 is a trapezoidal funnel, and a horizontal motor is installed on one side of the lower end of the drying box 3. The output shaft of the motor penetrates the side wall of the drying box 3 and is connected to a horizontal rotating shaft 16, and a plurality of cutting blades are connected to the rotating shaft 16.
[0034] When the rotating shaft 16 rotates, the cutting blades can rotate, which can prevent clogging of the outlet by clumps.
[0035] The liquid outlet of the drying box 3 is connected to the mixed solution tank 4 through a pipeline, and a scraper 18 is attached to one side of the bottom of the discharge end of the mesh belt conveyor 8. The scraper 18 is fixed to the inner wall of the drying box 3. The mesh belt conveyor 8 is provided with three, the drying box 3 is a rectangular box, and the drying box 3 is fixed to the bottom surface through a support frame 17. The drying box 3 is a closed micro-negative pressure structure.
[0036] Heat source of the low-temperature heat pump 10 dryer: part of the heat source of the low-temperature heat pump 10 dryer comes from the condenser water after use. The condenser water carrying heat is cooled by the heat exchange end of the low-temperature heat pump 10 dryer and then flows back to the cooling water pool for recycling. The hot end of the low-temperature heat pump 10 dryer dries the water on the surface of the crystal through a fan. The water-containing hot air is dehydrated by the built-in condenser of the low-temperature heat pump 10 dryer to form dry air, which circulates in the low-temperature heat pump 10 dryer. The removed water is introduced into the mixed solution tank 4 through a water guide pipe;
[0037] The scraper 18 timely scrapes the dried waste salt off the surface of the mesh belt conveyor 8 after one rotation period of heating the material, and the newly born mesh belt conveyor 8 surface is timely coated with high-salt wastewater crystallization mother liquor.
[0038] As Figures 2 to 5As shown, in embodiment two, the lower end of the drying box 3 is semicircular, both sides of the drying box 3 are provided with discharge ports 3-1, the bottom end of the drying box 3 is externally provided with a semicircular collection box 19, the collection box 19 blocks the discharge port 3-1, the bottom end of the collection box 19 is provided with a crystalline salt outlet, one side of the drying box 3 is provided with a motor, the output shaft of the motor is fixedly provided with a rotating rod 20, the rotating rod 20 is externally provided with a sliding groove 21, the sliding groove 21 is slidingly installed on the outer wall of the drying box 3, the middle of the sliding groove 21 is provided with a driving rod 16-1, the driving rod 16-1 is slidingly installed on the other side of the sliding groove 21, the bottom center of the drying box 3 is rotatably provided with a rotating shaft 16, both ends of the rotating shaft 16 pass through the outer wall of the drying box 3, and the driving rod 16-1 is fixedly installed on the rotating shaft 16.
[0039] When the dried waste salt is hung by the scraper 18 and falls to the bottom of the drying box 3, the motor is started to drive the rotating rod 20 to rotate and drive the sliding groove 21 to slide in the horizontal direction, so that the sliding groove 21 drives the driving rod 16-1 to displace, when the driving rod 16-1 displaces, is limited by the rotating shaft 16, so that the driving rod 16-1 reciprocatingly swings in a circular arc within a specified range, so that the rotating shaft 16 reciprocatingly swings in a circular arc.
[0040] Both ends of the rotating shaft 16 fixedly provided with a connecting rod 16-2 in the inside of the drying box 3, the bottom end of the connecting rod is fixedly provided with an extension plate 16-3, both ends of the extension plate 16-3 are fixedly provided with a scraper 16-4, the center of the extension plate 16-3 is fixedly provided with a brush 16-5, and the scraper 16-4 and the brush 16-5 are in contact with the inner wall of the drying box 3.
[0041] When the rotating shaft 16 rotates, the connecting rod 16-2 can be driven to rotate, when the connecting rod 16-2 rotates, the extension plate 16-3 can be driven to displace, so that the scraper 16-4 and the brush 16-5 displace;
[0042] First, when swinging, the scraper 18 cuts and crushes the crystalline salt in the inside of the drying box 3, and then the brush 16-5 sweeps the cut crystalline salt to the discharge port 3-1, so that the crystalline salt enters the inside of the collection box 19.
[0043] Both sides of the drying box 3 are provided with baffles 3-2, the baffles 3-2 can block the discharge port 3-1, both sides of the bottom end of the baffle 3-2 are fixedly provided with an arc-shaped rod 3-3, both sides of the inside of the drying box 3 are fixedly provided with a sleeve 3-5, a strip-shaped groove 3-6 is formed in the sleeve 3-5, the arc-shaped rod 3-3 is slidingly installed in the sleeve 3-5, a tooth is fixedly installed on the arc-shaped rod 3-3, a first tooth 3-4 is slidingly installed in the strip-shaped groove 3-6, and an arc-shaped spring 3-7 is fixedly installed between the end of the arc-shaped rod 3-3 and the inside of the sleeve 3-5.
[0044] When the scraper 18 contacts the baffle 3-2, continue to move, can drive the arc in the sleeve 3-5 slide, so that the baffle 3-2 is withdrawn from the discharge port 3-1, and stretch the arc spring 3-7, when the scraper 18 resets, the arc spring 3-7 will pull the baffle 3-2 reset, and the discharge port 3-1 is shielded.
[0045] The end of the sleeve 3-5 is provided with a moving block 22, the second tooth 22-1 is fixedly installed on one end of the moving block 22 close to the arc-shaped rod 3-3, the second tooth 22-1 is meshed with the first tooth 3-4, the bottom end of the moving block 22 is fixedly installed with a poking rod 22-2, the poking rod 22-2 contacts the inner wall of the drying box 3, the end of the moving block 22 away from the arc-shaped rod 3-3 is provided with a connecting plate 22-3, the connecting plate 22-3 is fixedly installed inside the drying box 3, the spring 22-4 is fixedly installed between the connecting plate 22-3 and the moving block 22, the limiting rod 22-5 is fixedly installed on the moving block 22, and the limiting rod 22-5 is slidingly installed on the connecting plate 22-3.
[0046] When the arc-shaped rod 3-3 slides, the first tooth 3-4 can be moved, so that the first tooth 3-4 drives the second tooth 22-1 to move away from the inner wall of the drying box 3, and the spring 22-4 is compressed, the arc-shaped rod 3-3 continues to move, the moving block 22 can reciprocate, and the poking rod 22-2 knocks the inner wall of the drying box 3, so that the crystalline salt on the inner wall of the drying box 3 can be dispersed.
[0047] Compared with the first embodiment, the second embodiment can increase the time of storing the crystalline salt in the drying box 3, so that the drying effect is better, and the scraper 18 can cut the agglomerated crystalline salt, the bristles 16-5 can sweep the crushed crystalline salt to the discharge port 3-1, and the poking rod 22-2 knocks the inner wall of the drying box 3, so that the crushed crystalline salt is gathered to the inner wall at the bottom end of the drying box 3, so that the crushing effect of the crystalline salt is better.
[0048] The technical scope of the utility model is not only limited to the content in the above description, and the person skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical thought of the utility model, and these deformations and modifications should all belong to the range of the utility model.
Claims
1. A low temperature crystallization dewatering device for high salinity wastewater treatment employing heat pump technology, characterized by, It includes: The medicine tank (1), the concentrated brine tank (2) and the drying box (3), the medicine tank (1) and the concentrated brine tank (2) are connected with the mixed solution tank (4) through pipeline respectively, the mixed solution tank (4) is connected with the crystallization growth tank (5) through pipeline, the crystallization growth tank (5) is connected on the feed inlet (6) of the drying box (3) side, the output end of the feed inlet (6) is connected with the distributor (7), the discharge end of the distributor (7) is located in the top end of the drying box (3) side, a plurality of net belt conveyors (8) are installed in the drying box (3), the bottom end of the drying box (3) is provided with a crystalline salt outlet, the crystalline salt outlet is provided with a switch valve (13), and the switch valve (13) outlet is connected with a packaging equipment (14).
2. A low temperature crystallization dewatering device for high salinity wastewater treatment using heat pump technology as claimed in claim 1, characterized in that, The side of the drying box (3) is provided with a heat pump (10), the air outlet (12) of the heat pump (10) is provided with a blower (11), the air outlet of the blower (11) is connected with an air outlet pipe, the top of the net belt conveyor (8) is matched with an internal hollow air distribution plate (9), the air distribution plate (9) is fixedly connected with the inner wall of the drying box (3), and the bottom surface of the air distribution plate (9) is provided with a plurality of air outlets, the air outlet pipe and the air distribution plate (9) are connected with an air outlet branch pipe for gas transmission, and a plurality of wet air outlets (12) are arranged on the drying box (3).
3. A low temperature crystallization dewatering device for high salinity wastewater treatment using heat pump technology as claimed in claim 2, characterized in that, The net belt ring of the net belt conveyor (8) is provided with an electric heating plate, the electric heating plate is installed on the inner wall of the drying box (3), the discharge end of the upper net belt conveyor (8) of the adjacent two net belt conveyors (8) is located directly above the feeding end of the lower net belt conveyor (8), and the feeding end of the uppermost net belt conveyor (8) is located directly below the discharge end of the distributor (7).
4. A low temperature crystallization dewatering device for high salinity wastewater treatment using heat pump technology as claimed in claim 3, characterized in that, The wet air outlet (12) on the top of the drying box (3) is connected with the condenser one-way inlet of the heat pump (10) through a pipeline, and the condenser one-way outlet is connected with a medicine recovery intermediate tank (15) through a pipeline.
5. A low temperature crystallization dewatering device for high salinity wastewater treatment using heat pump technology as claimed in claim 1, characterized in that, The lower end of the drying box (3) is a trapezoidal funnel, and a horizontal motor is installed on one side of the lower end of the drying box (3), the output shaft of the motor penetrates through the side wall of the drying box (3), and is connected with a horizontal rotating shaft (16), and a plurality of cutting blades are connected on the rotating shaft (16).
6. A low temperature crystallization dewatering device for high salinity wastewater treatment employing heat pump technology as claimed in claim 5, wherein, The liquid outlet of the drying box (3) is connected with the mixed solution tank (4) through a pipeline, a scraper (18) is attached to one side of the bottom of the discharge end of the net belt conveyor (8), the scraper (18) is fixed on the inner wall of the drying box (3), the net belt conveyor (8) is provided with three, the drying box (3) is a rectangular box, and the drying box (3) is fixed on the bottom surface through a support frame (17), and the drying box (3) is a closed micro-negative pressure structure.
7. A low temperature crystallization dewatering device for high salinity wastewater treatment using heat pump technology as claimed in claim 1, characterized in that, The lower end of the drying box (3) is semicircular, both sides of the drying box (3) are provided with discharge ports (3-1), the bottom end of the drying box (3) is externally provided with a semicircular collecting box (19), the collecting box (19) blocks the discharge ports (3-1), the bottom end of the collecting box (19) is provided with a crystalline salt outlet, one side of the drying box (3) is provided with a motor, the output shaft of the motor is fixedly provided with a rotating rod (20), the rotating rod (20) is externally provided with a sliding groove (21), the sliding groove (21) is slidingly installed on the outer wall of the drying box (3), the middle of the sliding groove (21) is provided with a driving rod (16-1), the driving rod (16-1) is slidingly installed in the other side of the sliding groove (21), the bottom end center of the drying box (3) is rotatably provided with a rotating shaft (16), both ends of the rotating shaft (16) pass through the outer wall of the drying box (3), and the driving rod (16-1) is fixedly installed on the rotating shaft (16).
8. A low temperature crystallization dewatering device for high salinity wastewater treatment employing heat pump technology as claimed in claim 7, wherein, Both ends of the rotating shaft (16) in the drying box (3) are fixedly provided with connecting rods (16-2), the bottom end of the connecting rod is fixedly provided with an extension plate (16-3), both ends of the extension plate (16-3) are fixedly provided with scrapers (16-4), the center of the extension plate (16-3) is fixedly provided with bristles (16-5), and the scrapers (16-4) and the bristles (16-5) are in contact with the inner wall of the drying box (3).
9. A low temperature crystallization dewatering device for high salinity wastewater treatment employing heat pump technology as claimed in claim 8, wherein, Both sides of the drying box (3) are provided with baffles (3-2), the baffles (3-2) can block the discharge ports (3-1), the bottom end of the baffle (3-2) is fixedly provided with an arc-shaped rod (3-3) on both sides, both sides of the inside of the drying box (3) are fixedly provided with sleeves (3-5), the sleeves (3-5) are provided with strip-shaped grooves (3-6), the arc-shaped rod (3-3) is slidingly installed in the sleeve (3-5), the arc-shaped rod (3-3) is fixedly provided with teeth, the first teeth (3-4) are slidingly installed in the strip-shaped grooves (3-6), and the end of the arc-shaped rod (3-3) and the inside of the sleeve (3-5) are fixedly provided with arc-shaped springs (3-7).
10. A low temperature crystallization dewatering device for high salinity wastewater treatment employing heat pump technology as claimed in claim 8, wherein, The end of the sleeve (3-5) is provided with a moving block (22), one end of the moving block (22) close to the arc-shaped rod (3-3) is fixedly provided with second teeth (22-1), the second teeth (22-1) are engaged with the first teeth (3-4), the bottom end of the moving block (22) is fixedly provided with a poking rod (22-2), the poking rod (22-2) is in contact with the inner wall of the drying box (3), one end of the moving block (22) away from the arc-shaped rod (3-3) is provided with a connecting plate (22-3), the connecting plate (22-3) is fixedly installed in the inside of the drying box (3), a spring (22-4) is fixedly installed between the connecting plate (22-3) and the moving block (22), a limiting rod (22-5) is fixedly installed on the moving block (22), and the limiting rod (22-5) is slidingly installed on the connecting plate (22-3).