Coal chemical evaporation pond high-salinity wastewater heat evaporation crystallization skid-mounted equipment

Abstract

The utility model discloses a kind of coal chemical evaporation pond high-salinity wastewater heat method evaporation crystallization pry installation equipment, it is related to evaporation crystallization technical field, including crystallizing tank, elastic scraper, cleaning strip, purging device, the upper end of crystallizing tank is equipped with cover, crystallizing tank bottom is equipped with discharge pipe, cover is equipped with driving rod by speed reducer motor, spiral strip and cleaning brush are installed on driving rod, cleaning strip is connected in driving rod lower end, purging device is communicated with discharge pipe. The utility model utilizes the cleaning strip of rotation and real-time dispersing crystalline salt in discharge pipe, avoid crystalline salt to block passage, cooperate with the gas strong purging of gas blowing pipe after crystalline salt, discharge is smooth, gas purging crystalline salt cannot affect the composition of crystalline salt, utilize spiral strip agitating wastewater, wastewater is heated evenly, speed up evaporation concentration, spiral strip can promote crystalline salt to discharge pipe movement, speed up crystalline salt discharge, cooperate with the scraping effect of scraper and cleaning brush, avoid crystalline salt accumulation in crystallizing tank inner wall.

Description

Technical Field

[0001] This utility model relates to the field of evaporation crystallization technology, specifically a skid-mounted device for thermal evaporation crystallization of high-salt wastewater from coal chemical evaporation ponds. Background Technology

[0002] The coal chemical industry generates a large amount of high-salt wastewater during production. Treating high-salt wastewater requires the use of crystallization equipment to separate the water from the salt crystals. However, due to the poor fluidity of the crystallized salt, blockages can occur during discharge.

[0003] To address the clogging problem, a search of relevant technologies revealed a solution for a centrifugal anti-clogging device for crystallizers (announcement number CN218011164U). This solution involves turning on the stirring motor, causing the rotating shaft to drive the stirring blades to stir. This centrifugal rotation of the liquid inside the anti-clogging device, in turn, drives the crystallizer to rotate, effectively preventing crystal accumulation and clogging of the outlet.

[0004] However, in the above scheme, the stirring blades need to use residual liquid or add liquid to clear the blockage of crystals, which increases the liquid content in the crystals. The stirring blades cannot push the crystals directly into the discharge port. In addition, the discharge port is vertically connected to the anti-blocking device, which reduces the crystal discharge efficiency. Utility Model Content

[0005] The purpose of this invention is to provide a skid-mounted equipment for thermal evaporation and crystallization of high-salt wastewater from coal chemical evaporation ponds, in order to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A skid-mounted thermal evaporation crystallization device for high-salt wastewater from a coal chemical evaporation pond includes a crystallization tank. The upper end of the crystallization tank is fitted with a cover to ensure its airtightness. A discharge pipe is installed at the bottom of the crystallization tank, vertically discharging crystallized salt to prevent clogging. The cover is driven by a geared motor with a drive rod. The drive rod is equipped with a spiral blade and a cleaning brush. The spiral blade and cleaning brush remove crystallized salt from the inner wall of the crystallization tank. The spiral blade agitates the wastewater inside the tank, improving the uniformity of heating and accelerating the evaporation crystallization efficiency. Furthermore, the cleaning brush scrapes away crystallized salt adhering to the inner wall of the crystallization tank in real time, preventing salt buildup from affecting the tank's thermal conductivity and reducing the amount of residual crystallized salt inside, thus reducing the difficulty of subsequent cleaning and ensuring long-term stable operation of the equipment. The elastic scraper is connected to the drive rod and makes elastic contact with the inner wall of the crystallization tank. The elastic scraper flexibly cleans the crystallized salt on the inner wall of the crystallization tank, which can ensure the scraping force to effectively remove the crystallized salt on the inner wall, while avoiding rigid contact that may cause scratches and wear to the inner wall of the tank, thus extending the service life of the crystallization tank. A cleaning bar, connected to the lower end of the drive rod, has a shape including but not limited to a serpentine bend to improve dispersing efficiency. Located inside the discharge pipe, the cleaning bar disperses clogged crystalline salt, preventing its accumulation and ensuring smooth discharge. This eliminates the need for frequent manual disassembly and cleaning of the discharge pipe, reducing equipment downtime for maintenance. The blower is connected to the discharge pipe. The blower introduces gas to blow out the dispersed crystallized salt, preventing the crystallized salt from adhering to or remaining on the inner wall of the discharge pipe. Gas blowing can increase the discharge speed and can also clean the dead corner areas inside the discharge pipe.

[0007] Furthermore, a jacket is installed on the outside of the crystallization tank. The jacket is connected to a medium inlet pipe and a medium outlet pipe. The medium inlet pipe and the medium outlet pipe form a medium circulation, which ensures the heating process is continuous and stable, improves the uniformity of heating of wastewater in the crystallization tank, avoids local overheating that could lead to the decomposition of wastewater components, and ensures the quality of crystallized salt. In addition, the jacket can achieve precise temperature control by adjusting the medium temperature and flow rate according to the treatment requirements, adapting to the evaporation and crystallization process requirements of high-salt wastewater of different concentrations.

[0008] Furthermore, the cover is equipped with an inlet pipe and several spare pipes. The spare pipes are screwed with plugs, which can be used to install thermometers, pressure gauges, level gauges, etc., to improve the flexibility and adaptability of the equipment and reserve space for the expansion of equipment functions. The plugs screwed into the spare pipes can achieve sealing when the spare pipes are not in use, preventing gas leakage in the tank or the entry of external impurities during the evaporation process, and ensuring the airtightness of the equipment.

[0009] Furthermore, the discharge pipe is rotatably connected to a sealing plate and a T-shaped stud. The sealing plate has a locking seat, and the T-shaped stud is screwed with a locking bolt that presses against the locking seat. The locking bolt is used to quickly lock the sealing plate to achieve a seal, preventing the leakage of untreated wastewater or water vapor in the tank and ensuring operational safety. Tightening the locking bolt to open the sealing plate does not require complicated tools, and the discharge pipe can be quickly opened and closed, improving operational convenience.

[0010] Furthermore, the elastic scraper includes a fixed rod and a positioning plate connected to the fixed rod. A movable plate is inserted into the positioning plate, and a spring is installed between the movable plate and the positioning plate. A scraper is installed on the movable plate, and a connecting ring is provided on the side of the scraper. The movable plate has a fixing hole, and the connecting ring is detachably connected to the fixing hole. The scraper contacts the wall of the crystallization tank to scrape off the crystallized salt. Its detachable structure makes it easy to replace the scraper separately after it wears out, without having to replace the entire elastic scraper, thus reducing maintenance costs.

[0011] Furthermore, the purger includes an air supply box, which is connected to an air delivery pipe and two air blowing pipes. The air blowing pipes are connected to the discharge pipe. The air supply box supplies compressed gas to the two air blowing pipes, and the compressed gas is used to purge and clean the discharge pipe, making the crystallized salt discharge more smoothly.

[0012] Compared with the prior art, the beneficial effects of this utility model are: (1) The rotating cleaning strips are used to disperse the crystallized salt in the discharge pipe in real time to prevent the crystallized salt from blocking the channel. Combined with the gas from the blowing pipe, the dispersed crystallized salt is strongly purged to ensure smooth discharge. Moreover, the gas purging of the crystallized salt will not affect the composition of the crystallized salt.

[0013] (2) The wastewater is stirred by the spiral strip, which heats the wastewater evenly and speeds up the evaporation and concentration. The spiral strip can also push the crystallized salt to move towards the discharge pipe, speeding up the discharge of the crystallized salt. Combined with the scraping action of the scraper and cleaning brush, the crystallized salt is prevented from accumulating on the inner wall of the crystallization tank.

[0014] (3) The jacket achieves uniform heating through medium circulation, avoiding direct contact between the heating element and the high-salt wastewater. This reduces corrosion and scaling, and ensures that the wastewater in the crystallizer is heated evenly. The backup pipe is used to draw the crystallizer into a negative pressure state, which accelerates the evaporation of wastewater and improves the crystallization efficiency. Attached Figure Description

[0015] Figure 1 This is a first-view structural schematic diagram of the present invention; Figure 2 This is a structural schematic diagram of the present invention from a second perspective; Figure 3 This is a schematic diagram of the connection between the discharge pipe and the air blowing pipe of this utility model; Figure 4 This is a schematic diagram of the structure of the spiral strip of this utility model; Figure 5 This is a cross-sectional view of the crystallization tank of this utility model; Figure 6 This is a schematic diagram of the connection between the fixing rod and the positioning plate of this utility model; Figure 7 This is a schematic diagram of the connection between the scraper and the movable plate of this utility model.

[0016] In the diagram: 1. Jacket; 2. Crystallizer; 3. Cover; 4. Inlet pipe; 5. Gear motor; 6. Spare pipe; 7. Plug; 8. Medium outlet pipe; 9. Medium inlet pipe; 10. Air supply box; 11. Discharge pipe; 12. Sealing plate; 13. Air supply pipe; 14. Air blowing pipe; 15. Locking seat; 16. T-shaped stud; 17. Locking bolt; 18. Drive rod; 19. Spiral strip; 20. Cleaning brush; 21. Fixing rod; 22. Scraper; 23. Cleaning strip; 24. Positioning plate; 25. Movable plate; 26. Spring; 27. Connecting ring; 28. Insert rod. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Example: Please see Figure 1-7 This utility model provides a technical solution: a skid-mounted equipment for thermal evaporation and crystallization of high-salt wastewater from a coal chemical evaporation pond, including a crystallization tank 2, an elastic scraper, a cleaning strip 23, and a blower. The bottom of the crystallization tank 2 is circular, which is conducive to guiding the crystallized salt to the discharge pipe 11.

[0019] A cover 3 is installed at the top of the crystallization tank 2. The cover 3 is connected to the crystallization tank 2 by several bolts and nuts. A discharge pipe 11 is installed at the bottom of the crystallization tank 2. The cover 3 is connected to a drive rod 18 by a geared motor 5. A mechanical seal is installed between the drive rod 18 and the cover 3 to ensure the airtightness of the crystallization tank 2. A spiral strip 19 and a cleaning brush 20 are installed on the drive rod 18. The spiral strip 19 and the cleaning brush 20 remove the crystallized salt from the inner wall of the crystallization tank 2. The spiral strip 19 is close to the inner wall of the crystallization tank 2 but does not contact it. The spiral strip 19 has a cleaning effect on the crystallization tank 2. The rotation of the spiral strip 19 pushes the crystallized salt downward. The cleaning brush 20 cleans the crystallization tank 2 more thoroughly and prevents the crystallized salt from adhering to the crystallization tank 2.

[0020] The elastic scraper is connected to the drive rod 18. The elastic scraper makes elastic contact with the inner wall of the crystallization tank 2. The elastic scraper flexibly cleans the crystallized salt on the inner wall of the crystallization tank 2. The flexible cleaning method can adapt to the curvature of the inner wall of the crystallization tank 2, improve the cleaning coverage, reduce the residue of crystallized salt, and is suitable for material treatment scenarios such as high-salt wastewater that are prone to rapid scaling on the wall surface, ensuring continuous and efficient evaporation and crystallization capabilities.

[0021] The cleaning strip 23 is connected to the lower end of the drive rod 18 and is located inside the discharge pipe 11. The shape of the cleaning strip 23 includes, but is not limited to, a serpentine bend, and it can be bent at ninety degrees multiple times. The purpose is to expand the dispersing range of the cleaning strip 23. The cleaning strip 23 disperses the blockage of crystallized salt. The dispersed crystallized salt particles are more uniform, making it easier for the subsequent blower to completely discharge them, avoiding secondary agglomeration of residual crystallized salt in the discharge pipe 11, and reducing the risk of blockage.

[0022] The blower is connected to the discharge pipe 11. Gas is introduced into the blower to blow out the dispersed crystallized salt. Water vapor can be used for blowing, and the heat of the water vapor can soften the crystallized salt, resulting in a better cleaning effect on the discharge pipe 11.

[0023] In this embodiment, as Figure 2 and Figure 5 As shown, a jacket 1 is installed on the outside of the crystallization tank 2. The jacket 1 is connected to a medium inlet pipe 9 and a medium outlet pipe 8. Water vapor is used to heat the crystallization tank 2. Water vapor is introduced into the medium inlet pipe 9, and the medium outlet pipe 8 is used to discharge the water vapor after heat exchange. During the flow of the medium in the jacket 1, the heat is transferred to the high-salt wastewater in the crystallization tank 2 to realize the evaporation and concentration of the wastewater.

[0024] In this embodiment, as Figure 1 As shown, the cover 3 is equipped with an inlet pipe 4 and several spare pipes 6. The spare pipes 6 are screwed with plugs 7. Wastewater is fed into the crystallizer 2 through the inlet pipe 4. The spare pipes 6 can be used as outlets after the wastewater evaporates. The spare pipes 6 can also be connected to a negative pressure machine to achieve air extraction from the crystallizer 2. The negative pressure can lower the boiling point of the wastewater, allowing the wastewater to boil and evaporate at a lower temperature. This can reduce the energy consumption required for heating and avoid problems such as scaling and decomposition of certain components in the wastewater at high temperatures, thus ensuring stable operation of the equipment and the wastewater treatment effect.

[0025] In this embodiment, as Figure 3 As shown, the discharge pipe 11 is rotatably connected to a sealing plate 12 and a T-shaped stud 16. The sealing plate 12 has a locking seat 15, and the T-shaped stud 16 is screwed with a locking bolt 17 that presses against the locking seat 15, ensuring a sealed connection between the discharge pipe 11 and the sealing plate 12. A sealing ring can also be set between the discharge pipe 11 and the sealing plate 12 to prevent leakage. Loosening the locking bolt 17 and the locking seat 15 separates the sealing plate 12, allowing the crystalline salt couple to be discharged from the discharge pipe 11.

[0026] In this embodiment, as Figure 6 and Figure 7As shown, the elastic scraper includes a fixed rod 21 and a positioning plate 24 connected to the fixed rod 21. A cleaning brush 20 is connected to the other end of the fixed rod 21. A movable plate 25 is inserted into the positioning plate 24, and a spring 26 is installed between the movable plate 25 and the positioning plate 24. A scraper 22 is installed on the movable plate 25. A connecting ring 27 is provided on the side of the scraper 22. The movable plate 25 has a fixing hole. The connecting ring 27 is detachably connected to the fixing hole. An insert rod 28 that passes through the positioning plate 24 is screwed onto the movable plate 25. The spring 26 sleeves the insert rod 28. The elastic force of the spring 26 maintains the contact state between the scraper 22 and the crystallization tank 2. The scraper 22 rotates to clean the inner wall of the crystallization tank 2. The scraper 22 can float with the help of the spring 26, making the cleaning of the crystallized salt more thorough.

[0027] In this embodiment, as Figure 3 As shown, the purger includes an air supply box 10, which is connected to an air supply pipe 13 and two air blowing pipes 14. The air blowing pipes 14 are connected to the discharge pipe 11. The air supply box 10 is annularly fitted around the discharge pipe 11. The two air blowing pipes 14 are inclined and the blowing direction is aligned with the outlet of the discharge pipe 11. Water vapor can be used to blow out the crystallized salt.

[0028] Specifically, during use, air is extracted from the crystallization tank 2 using a negative pressure machine and through the spare pipe 6, so that the inside of the crystallization tank 2 is in a negative pressure state. The liquid inlet pipe 4 is connected to the evaporation pond container through a valve. When the valve is opened, the crystallization tank 2 can be used to extract wastewater or to transport wastewater by a water pump. After the wastewater volume reaches the standard, the valve is closed, and it is confirmed that the crystallization tank 2 is still in a negative pressure state.

[0029] Steam is sent to jacket 1 using a steam generator. The steam heats the crystallizer 2 and the wastewater. The geared motor 5 is started. The geared motor 5 drives the spiral strip 19, cleaning brush 20 and scraper 22 to rotate through the drive rod 18, thereby agitating the wastewater and ensuring that the wastewater is heated evenly. The steam evaporated from the wastewater is discharged through the spare pipe 6.

[0030] After the wastewater evaporates, crystalline salt precipitates out. After loosening the locking bolt 17, the sealing plate 12 is opened, and the spiral strip 19 rotates to push the crystalline salt downward. The scraper 22 scrapes the crystalline salt on the inner wall of the crystallization tank 2, and the cleaning brush 20 cleans the crystalline salt. The crystalline salt falls into the discharge pipe 11, and the cleaning strip 23 rotates in the discharge pipe 11 to disperse the crystalline salt, ensuring that the discharge pipe 11 will not be blocked. Water vapor is blown through the air blowing pipe 14 to clean the discharge pipe 11. The crystallization is discharged quickly and without blockage.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A skid-mounted device for thermal evaporation and crystallization of high-salt wastewater from coal chemical evaporation ponds, characterized in that, include: A crystallization tank, wherein a cover is installed at the top of the crystallization tank and a discharge pipe is installed at the bottom of the crystallization tank. The cover is equipped with a drive rod via a reduction motor. A spiral strip and a cleaning brush are installed on the drive rod. The spiral strip and the cleaning brush remove the crystallized salt from the inner wall of the crystallization tank. An elastic scraper is connected to a drive rod and makes elastic contact with the inner wall of the crystallization tank, thus flexibly cleaning the crystallized salt on the inner wall of the crystallization tank. The cleaning bar is connected to the lower end of the drive rod and is located inside the discharge pipe. The cleaning bar breaks up the blockage of crystalline salt. A blower is connected to a discharge pipe, and gas is introduced into the blower to blow out the dispersed crystalline salt.

2. The skid-mounted equipment for thermal evaporation and crystallization of high-salt wastewater from coal chemical evaporation ponds according to claim 1, characterized in that: The crystallizer is equipped with a jacket, which is connected to a medium inlet pipe and a medium outlet pipe.

3. The skid-mounted equipment for thermal evaporation and crystallization of high-salt wastewater from coal chemical evaporation ponds according to claim 1, characterized in that: The cap is equipped with an inlet pipe and several spare pipes, and the spare pipes are screwed with plugs.

4. The skid-mounted equipment for thermal evaporation and crystallization of high-salt wastewater from coal chemical evaporation ponds according to claim 1, characterized in that: The discharge pipe is rotatably connected to a sealing plate and a T-shaped stud. The sealing plate has a locking seat, and the T-shaped stud is screwed with a locking bolt that presses against the locking seat.

5. The skid-mounted equipment for thermal evaporation and crystallization of high-salt wastewater from coal chemical evaporation ponds according to claim 1, characterized in that: The shape of the cleaning strip includes, but is not limited to, a serpentine bend.

6. The skid-mounted equipment for thermal evaporation and crystallization of high-salt wastewater from coal chemical evaporation ponds according to claim 1, characterized in that: The elastic scraper includes a fixed rod and a positioning plate connected to the fixed rod. A movable plate is inserted into the positioning plate, and a spring is installed between the movable plate and the positioning plate. A scraper is installed on the movable plate.

7. The skid-mounted equipment for thermal evaporation and crystallization of high-salt wastewater from coal chemical evaporation ponds according to claim 1, characterized in that: The blower includes an air supply box, which is connected to an air delivery pipe and two air blowing pipes, and the air blowing pipes are connected to the discharge pipe.

8. A skid-mounted equipment for thermal evaporation and crystallization of high-salt wastewater from a coal chemical evaporation pond according to claim 6, characterized in that: The scraper is provided with a connecting ring on its side, and the movable plate has a fixing hole. The connecting ring is detachably connected to the fixing hole.

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