A hardening device for mixed salt recovery of a coking wastewater evaporation system

Abstract

The application discloses a hard-removing device for mixed salt recovery of a coking wastewater evaporation system, and relates to the technical field of coking wastewater treatment, in particular to a hard-removing device for mixed salt recovery of a coking wastewater evaporation system, which comprises a coagulation tank, a partition plate is fixedly installed in the coagulation tank, the partition plate separates the coagulation tank into a mixing tank and a flocculation tank, a supporting plate one is installed at the top of the coagulation tank, a feeding barrel is installed in the flocculation tank, a driving motor two is arranged at the top of the feeding barrel, and a stirring shaft two is connected to the bottom of the output shaft of the driving motor two. The hard-removing device for mixed salt recovery of the coking wastewater evaporation system is provided with the feeding barrel, the water inlet impeller is driven to rotate by the driving motor two, the wastewater is sucked into the feeding barrel, mixed with PAM flocculants, the feeding barrel can isolate the wastewater on the inside and outside, the PAM flocculants in the inside are in a high-concentration state, and the flocculation and sedimentation effect on calcium and magnesium ions can be improved.

Description

Technical Field

[0001] This invention relates to the field of coking wastewater treatment technology, specifically a hardening removal device for recovering mixed salts in a coking wastewater evaporation system. Background Technology

[0002] In recent years, with the continuous development of heavy industry, the discharge of coking wastewater has been increasing. In order to prevent serious threats to the ecological environment and protect limited water resources, it is necessary to study the coking wastewater treatment process. Coking wastewater is a typical toxic and recalcitrant organic wastewater. It mainly comes from the primary cooling of coke oven gas, production water in the coking process, and steam condensate wastewater. The pollutant concentration in coking wastewater is high and difficult to degrade. Due to the presence of nitrogen in coking wastewater, there is an excess of nitrogen source required for biological purification, which brings great difficulties to achieving treatment standards.

[0003] To reduce water consumption, coking wastewater needs to be recycled. To ensure water quality meets production requirements, source water must be treated to a certain extent. Whether it's demineralized water used in production processes, general water used in circulating water systems, or treated wastewater reused, the hardness of the raw water affects the operating units. Although scale inhibitors are added to circulating water and reverse osmosis membrane systems, scaling cannot be completely prevented. Therefore, when the source water has high hardness, hardness removal technology must be implemented to reduce it and prevent scaling during use. Existing hardness removal processes mainly use lime or sodium hydroxide as hardness removal agents, followed by conventional sedimentation and sand filtration. This results in low removal rates and the effluent contains suspended particles. Subsequent processes require further fine filtration. Therefore, we provide a hardness removal device for mixed salt recovery in coking wastewater evaporation systems. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a hardening removal device for mixed salt recovery in a coking wastewater evaporation system, which solves the problems mentioned in the background section.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a hardening removal device for mixed salt recovery in a coking wastewater evaporation system, comprising a coagulation tank, wherein a partition is fixedly installed inside the coagulation tank, dividing the interior of the coagulation tank into a mixing tank and a flocculation tank; a support plate is installed on the top of the coagulation tank; a feeding tank is installed inside the flocculation tank; a drive motor is installed on the top of the feeding tank; a stirring shaft is connected to the bottom of the output shaft of the drive motor; an inlet impeller is connected to the outside of the stirring shaft; a sedimentation tank is located on the right side of the coagulation tank; a support plate is installed on the top of the sedimentation tank; and a movable sleeve is fitted inside the support plate. The stirring shaft umbrella has a hollow tube inside. A conveying pipe is movably sleeved on the top of the hollow tube. A conveying pump is connected to the left end of the conveying pipe, and the inlet of the conveying pump extends into the flocculation tank. A distribution pipe is connected to the side of the stirring shaft umbrella. A second conveying pump is connected to the right side of the sedimentation tank. A second conveying pipe is connected to the output shaft of the second conveying pump. A filter tank is connected to the end of the second conveying pipe away from the second conveying pump. A porous support plate is installed inside the filter tank. Filter resin is placed on the top of the porous support plate. A clean water output pipe and a backwash output pipe are connected to the right side of the filter tank. A backwash pipe is connected to the top of the filter tank.

[0006] Optionally, an inlet pipe is fixedly connected to the left side of the coagulation tank. The inlet pipe is connected to the left side of the mixing tank. By setting the inlet pipe, the wastewater is transported into the interior of the mixing tank.

[0007] Optionally, a drive motor is installed on the top of the support plate and located above the mixing tank. The bottom of the output shaft of the drive motor is connected to a stirring shaft, and a stirring blade is fitted on the bottom of the stirring shaft. The drive motor drives the stirring shaft to rotate, and the stirring shaft drives the stirring blade to rotate, which can mix the wastewater and coagulant inside the mixing tank.

[0008] Optionally, the side of the feeding bucket is fixed to the inner wall of the flocculation tank by a thin plate, a small hole is opened at the bottom of the feeding bucket, and a water inlet is opened in the middle of the feeding bucket. By setting up the feeding bucket, the feeding bucket can isolate the wastewater inside and outside, so that the PAM flocculant inside is in a high concentration state, which can improve the effect of calcium and magnesium ion flocculation and sedimentation.

[0009] Optionally, the water inlet impeller is composed of multiple centrally symmetrical arc-shaped plates. The water inlet impeller is located in the water inlet. By setting the water inlet impeller, the water inlet impeller can be rotated by the stirring shaft II, which can make the water inlet impeller suck the wastewater outside the feeding tank into the inside of the feeding tank.

[0010] Optionally, the bottom of the second stirring shaft extends into the inside of the feeding tank, and the bottom of the second stirring shaft is fitted with a second stirring blade. By setting the second stirring blade, the second stirring shaft drives the second stirring blade to rotate, which enables the second stirring blade to mix and stir the flocculant and wastewater inside the feeding tank.

[0011] Optionally, the top of the stirring shaft umbrella extends to the top of the support plate two, and an umbrella-shaped wheel is fixedly sleeved on the outside of the stirring shaft umbrella. A drive motor three is installed on the top of the support plate two, and the output shaft of the drive motor three meshes with the umbrella-shaped wheel. The drive motor three drives the umbrella-shaped wheel to rotate, and the umbrella-shaped wheel drives the stirring shaft umbrella to rotate, which enables the distribution pipe and the scraper to rotate.

[0012] Optionally, the sedimentation tank is equipped with an inclined plate, the stirring shaft passes through the inclined plate and extends to the bottom of the inclined plate, the bottom of the hollow pipe is connected to the distribution pipe, and the bottom of the distribution pipe is provided with a drain outlet. By setting up the distribution pipe, the wastewater is sucked into the hollow pipe by a conveying pump, and then the hollow pipe transports the wastewater to the distribution pipe and sprays it out from the bottom of the distribution pipe, so that the wastewater is distributed more evenly.

[0013] Optionally, a scraper is connected to the bottom of the stirring shaft umbrella. The scraper is in contact with the bottom of the sedimentation tank cavity. By setting the scraper, the rotation of the scraper can scrape off the impurities that have settled to the bottom of the sedimentation tank, preventing impurities from adhering to the bottom of the sedimentation tank and making it easier to clean.

[0014] Optionally, the clean water output pipe is connected to the top space of the filter resin, and the backwash output pipe is connected to the bottom space of the porous support plate. The end of the backwash pipe away from the filter tank is connected to a water pump, and the inlet of the water pump is connected to a water pipe. By setting up the backwash pipe, when the filter resin adsorbs too many impurities, the water pump delivers clean water to the inside of the filter tank, which can backwash the filter resin, remove impurities from the filter resin, and improve the service life of the filter resin.

[0015] This invention provides a hardening removal device for mixed salt recovery in a coking wastewater evaporation system, which has the following beneficial effects:

[0016] 1. The hardness removal device for mixed salt recovery in this coking wastewater evaporation system uses a feeding tank to add PAM flocculant. The drive motor drives the inlet impeller to rotate, drawing wastewater into the feeding tank to mix with the PAM flocculant. The feeding tank can isolate the wastewater inside and outside, keeping the PAM flocculant in a high concentration state, which can improve the flocculation and sedimentation effect of calcium and magnesium ions and reduce water hardness.

[0017] 2. The hardening removal device for mixed salt recovery in this coking wastewater evaporation system uses a distribution pipe to transport wastewater from the right side of the flocculation tank to a hollow pipe via a conveying pump. The hollow pipe then transports the water to the distribution pipe for spraying. Simultaneously, a drive motor rotates the stirring shaft, causing the distribution pipe to rotate. This disperses the wastewater evenly into the sedimentation tank, allowing the wastewater sediment to settle evenly downwards. This prevents the sediment from accumulating on one side of the sedimentation tank, facilitating the discharge of the sediment.

[0018] 3. The hardness removal device for mixed salt recovery in the coking wastewater evaporation system is equipped with a filter tank. The wastewater after sedimentation in the sedimentation tank is transported to the filter tank by a second pump. The filter resin inside the filter tank adsorbs and filters the wastewater, further reducing the hardness of the wastewater. When there are many impurities in the filter resin, clean water is transported to the top of the filter resin by a water pump to backwash the filter resin, remove the impurities in the filter resin, and improve the service life of the filter resin. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention;

[0020] Figure 2 This is a structural schematic diagram of the present invention from another angle;

[0021] Figure 3 This is a schematic diagram of the structure of the present invention in half section;

[0022] Figure 4 This is a schematic diagram of the feeding barrel of the present invention;

[0023] Figure 5 This is a schematic diagram of the inlet impeller of the present invention;

[0024] Figure 6 This is a schematic diagram of the distribution tube of the present invention.

[0025] In the diagram: 1. Coagulation tank; 2. Inlet pipe; 3. Baffle plate; 4. Mixing tank; 5. Support plate 1; 6. Drive motor 1; 7. Agitator shaft 1; 8. Agitator blade 1; 9. Flocculation tank; 10. Feeding tank; 11. Drive motor 2; 12. Agitator shaft 2; 13. Inlet impeller; 14. Agitator blade 2; 15. Sedimentation tank; 16. Support plate 2; 17. Agitator shaft umbrella; 18. Hollow pipe; 19. Umbrella wheel; 20. Drive motor 3; 21. Conveying pipe 1; 22. Conveying pump 1; 23. Distribution pipe; 24. Sludge scraper; 25. Inclined plate; 26. Conveying pump 2; 27. Conveying pipe 2; 28. Filter tank; 29. ​​Porous support plate; 30. Filter resin; 31. Clean water output pipe; 32. Backwash pipe; 33. Water pump; 34. Backwash output pipe. Detailed Implementation

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0027] Please see Figures 1 to 3 This invention provides a technical solution: a hardening removal device for salt recovery in a coking wastewater evaporation system, comprising a coagulation tank 1, an inlet pipe 2 fixedly connected to the left side of the coagulation tank 1, the inlet pipe 2 communicating with the left side of a mixing tank 4, the inlet pipe 2 being used to transport wastewater into the interior of the mixing tank 4, a partition 3 fixedly installed inside the coagulation tank 1, the partition 3 dividing the interior of the coagulation tank 1 into a mixing tank 4 and a flocculation tank 9, a support plate 5 installed on the top of the coagulation tank 1, a drive motor 6 installed on the top of the support plate 5 above the mixing tank 4, a stirring shaft 7 connected to the bottom of the output shaft of the drive motor 6, and a stirring blade 8 fitted at the bottom of the stirring shaft 7, the drive motor 6 driving the stirring shaft 7 to rotate, and the stirring shaft 7 driving the stirring blade 8 to rotate, thereby mixing the wastewater and coagulant inside the mixing tank 4.

[0028] Please see Figures 3 to 5 The flocculation tank 9 is equipped with a feeding tank 10. The side of the feeding tank 10 is fixed to the inner wall of the flocculation tank 9 by a thin plate. PAM flocculant is added to the feeding tank 10. A small hole is opened at the bottom of the feeding tank 10, and a water inlet is opened in the middle of the feeding tank 10. By setting up the feeding tank 10, the feeding tank 10 can isolate the wastewater inside and outside, so that the PAM flocculant inside is in a high concentration state, which can improve the flocculation and sedimentation effect of calcium and magnesium ions. A second drive motor 11 is set at the top of the feeding tank 10. The bottom of the output shaft of the second drive motor 11 is connected to a second stirring shaft 12. The outside of the second stirring shaft 12 is connected to a water inlet impeller 13. The water inlet impeller 13 is composed of multiple centrally symmetrical arc plates, such as... Figure 5 The inlet impeller 13, composed of eighteen arc-shaped plates, is located in the inlet. By setting the inlet impeller 13, the agitator shaft 2 12 drives the inlet impeller 13 to rotate, which can draw wastewater from outside the feeding tank 10 into the inside of the feeding tank 10. The bottom of the agitator shaft 2 12 extends into the inside of the feeding tank 10, and the bottom of the agitator shaft 2 12 is fitted with agitator blade 2 14. By setting the agitator blade 2 14, the agitator shaft 2 12 drives the agitator blade 2 14 to rotate, which can mix and stir the flocculant and wastewater inside the feeding tank 10.

[0029] Please see Figure 3 , Figure 6A sedimentation tank 15 is located on the right side of the coagulation tank 1. A support plate 2 16 is installed on the top of the sedimentation tank 15. An agitator shaft umbrella 17 is movably sleeved inside the support plate 2 16. A hollow tube 18 is opened inside the agitator shaft umbrella 17. The top of the agitator shaft umbrella 17 extends to the top of the support plate 2 16. An umbrella-shaped wheel 19 is fixedly sleeved on the outside of the agitator shaft umbrella 17. A drive motor 3 20 is installed on the top of the support plate 2 16. The output shaft of the drive motor 3 20 meshes with the umbrella-shaped wheel 19. The drive motor 3 20 drives the umbrella-shaped wheel 19 to rotate, and the umbrella-shaped wheel 19 drives the agitator shaft umbrella 17 to rotate, which enables the distribution pipe 23 and the scraper 24 to rotate. A conveying pipe 1 21 is movably sleeved on the top of the hollow tube 18. A conveying pump 1 22 is connected to the left end of the conveying pipe 1 21. The inlet of the conveying pump 1 22 extends into the interior of the flocculation tank 9. By setting up the conveying pump 1 22, the flocculation tank 9 is emptied of the sludge. Wastewater is transported to hollow pipe 18 via conveying pipe 21, which can transfer the wastewater. A distribution pipe 23 is connected to the side of stirring shaft umbrella 17. The bottom of hollow pipe 18 is connected to distribution pipe 23. A drain outlet is opened at the bottom of distribution pipe 23. By setting distribution pipe 23, wastewater is sucked into hollow pipe 18 by conveying pump 22. Then hollow pipe 18 transports wastewater to distribution pipe 23 and sprays it out from the bottom of distribution pipe 23, making the wastewater distribution more uniform. A scraper 24 is connected to the bottom of stirring shaft umbrella 17. The scraper 24 is attached to the bottom of the inner cavity of sedimentation tank 15. By setting scraper 24, the rotation of scraper 24 is used to scrape off the impurities settled at the bottom of sedimentation tank 15, preventing impurities from adhering to the bottom of sedimentation tank 15 and making it easier to clean. An inclined plate 25 is installed inside sedimentation tank 15. Stirring shaft umbrella 17 passes through inclined plate 25 and extends into the bottom of inclined plate 25.

[0030] Please see Figure 1 , Figure 3A second transfer pump 26 is connected to the right side of the sedimentation tank 15. The output shaft of the second transfer pump 26 is connected to a second transfer pipe 27. The end of the second transfer pipe 27 furthest from the second transfer pump 26 is connected to a filter tank 28. By using the second transfer pump 26, the supernatant liquid settled in the sedimentation tank 15 is transported to the filter tank 28 for further hardening treatment of the wastewater. A porous support plate 29 is installed inside the filter tank 28. A filter resin 30 is installed on the top of the porous support plate 29. The filter resin 30 is one of epoxy resin, alkyd resin, or phenolic resin. By using the filter resin 30, it can further absorb calcium and magnesium ions in the wastewater, further reducing the hardness of the wastewater. A clean water output pipe 31 is connected to the right side of the filter tank 28. The backwash output pipe 34 and the clean water output pipe 31 are connected to the top space of the filter resin 30, and the backwash output pipe 34 is connected to the bottom space of the porous support plate 29. By setting the clean water output pipe 31 and the backwash output pipe 34, the filtered wastewater flows out from the clean water output pipe 31 and the backwash wastewater flows out from the backwash output pipe 34. The top of the filter tank 28 is connected to the backwash pipe 32, and the end of the backwash pipe 32 away from the filter tank 28 is connected to the water pump 33. The inlet of the water pump 33 is connected to the water pipe. By setting the backwash pipe 32, when the filter resin 30 adsorbs too many impurities, the water pump 33 is used to deliver clean water to the inside of the filter tank 28, which can backwash the filter resin 30, remove the impurities in the filter resin 30, and improve the service life of the filter resin 30.

[0031] In summary, the hardening removal device for salt recovery in this coking wastewater evaporation system operates as follows: wastewater is transported from the inlet pipe 2 to the mixing tank 4. Coagulant is then added to the mixing tank 4, and the drive motor 6 drives the stirring shaft 7 to rotate, causing the stirring blades 8 to mix the coagulant. The mixed wastewater enters the flocculation tank 9 from the top of the baffle 3. The drive motor 11 drives the inlet impeller 13 to rotate, drawing the wastewater into the feeding tank 10. PAM flocculant is then added to the feeding tank 10, and the stirring blades 14 mix the PAM flocculant. The mixed wastewater flows out from the bottom of the feeding tank 10 and is then pumped by the transfer pump 22 into the hollow pipe 18, and finally sprayed out into the distribution pipe 23. Simultaneously, the drive motor 20 drives the stirring shaft 17 to rotate, causing the distribution pipe 23 to rotate and spray wastewater, making the concentration of wastewater in the sedimentation tank 15 more uniform. Then, the wastewater settles in the sedimentation tank 15, and the clear water after sedimentation is transported to the filter tank 28 by the transfer pump 26. At this time, the clear water output pipe 31 is opened and the backwash output pipe 34 is closed. After the wastewater is adsorbed by the filter resin 30, it is discharged from the clear water output pipe 31, further removing the hardness of the wastewater. When the adsorption capacity of the filter resin 30 decreases, the clear water output pipe 31 is closed and the backwash output pipe 34 is opened. Then, the water pump 33 delivers clear water into the filter tank 28 to backwash the filter resin 30, so that the impurities are discharged from the backwash output pipe 34.

[0032] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Moreover, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0033] Although embodiments of the 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 invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hardening removal device for salt recovery in a coking wastewater evaporation system, comprising a coagulation tank (1), characterized in that: The coagulation tank (1) is fixedly equipped with a partition (3), which divides the interior of the coagulation tank (1) into a mixing tank (4) and a flocculation tank (9). A support plate (5) is installed on the top of the coagulation tank (1). A feeding bucket (10) is installed inside the flocculation tank (9). A drive motor (11) is installed on the top of the feeding bucket (10). A stirring shaft (12) is connected to the bottom of the output shaft of the drive motor (11). An inlet impeller (13) is connected to the outside of the stirring shaft (12). A sedimentation tank (15) is set on the right side of the coagulation tank (1). A support plate (16) is installed on the top of the sedimentation tank (15). A stirring shaft umbrella (17) is movably sleeved inside the support plate (16). A hollow tube (18) is opened inside the stirring shaft umbrella (17). The top of the container is movably connected to a first conveying pipe (21), the left end of which is connected to a first conveying pump (22), the inlet of which extends into the interior of the flocculation tank (9), the side of the stirring shaft umbrella (17) is connected to a distribution pipe (23), the right side of the sedimentation tank (15) is connected to a second conveying pump (26), the output shaft of the second conveying pump (26) is connected to a second conveying pipe (27), the end of the second conveying pipe (27) away from the second conveying pump (26) is connected to a filter tank (28), the interior of the filter tank (28) is equipped with a porous support plate (29), the top of the porous support plate (29) is provided with filter resin (30), the right side of the filter tank (28) is connected to a clean water output pipe (31) and a backwash output pipe (34), and the top of the filter tank (28) is connected to a backwash pipe (32). The side of the feeding bucket (10) is fixed to the inner wall of the flocculation tank (9) by a thin plate. A small hole is opened at the bottom of the feeding bucket (10), and a water inlet is opened in the middle of the feeding bucket (10). The inlet impeller (13) is composed of multiple centrally symmetrical arc-shaped plates, and the inlet impeller (13) is located in the inlet. The bottom of the stirring shaft umbrella (17) is connected to a scraper (24), and the scraper (24) is attached to the bottom of the inner cavity of the sedimentation tank (15). The clean water output pipe (31) is connected to the top space of the filter resin (30), the backwash output pipe (34) is connected to the bottom space of the porous support plate (29), the backwash pipe (32) is connected to a water pump (33) at the end away from the filter tank (28), and the inlet of the water pump (33) is connected to a water pipe.

2. The hardening removal device for mixed salt recovery in a coking wastewater evaporation system according to claim 1, characterized in that: The coagulation tank (1) is fixedly connected to the left side of the water inlet pipe (2), and the water inlet pipe (2) is connected to the left side of the mixing tank (4).

3. The hardening removal device for mixed salt recovery in a coking wastewater evaporation system according to claim 1, characterized in that: The top of the support plate (5) is equipped with a drive motor (6) located above the mixing tank (4). The bottom of the output shaft of the drive motor (6) is connected to a stirring shaft (7), and the bottom of the stirring shaft (7) is fitted with a stirring blade (8).

4. The hardening removal device for mixed salt recovery in a coking wastewater evaporation system according to claim 1, characterized in that: The bottom of the second stirring shaft (12) extends into the inside of the feeding barrel (10), and the bottom of the second stirring shaft (12) is fitted with a second stirring blade (14).

5. The hardening removal device for mixed salt recovery in a coking wastewater evaporation system according to claim 1, characterized in that: The top of the stirring shaft umbrella (17) extends to the top of the support plate two (16). An umbrella-shaped wheel (19) is fixedly sleeved on the outside of the stirring shaft umbrella (17). A drive motor three (20) is installed on the top of the support plate two (16). The output shaft of the drive motor three (20) meshes with the umbrella-shaped wheel (19).

6. The hardening removal device for mixed salt recovery in a coking wastewater evaporation system according to claim 1, characterized in that: The sedimentation tank (15) is equipped with an inclined plate (25). The stirring shaft umbrella (17) passes through the inclined plate (25) and extends into the bottom of the inclined plate (25). The bottom of the hollow tube (18) is connected to the distribution pipe (23). The bottom of the distribution pipe (23) is provided with a water outlet.

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