Crystallization separation system for waste brine treatment

Abstract

The invention discloses a crystallization separation system for waste brine treatment, which comprises a disc tube type reverse osmosis device, a plurality of crystallization boxes are arranged on the right side of the disc tube type reverse osmosis device, and the upper end of the disc tube type reverse osmosis device is communicated with a waste brine conveying pipe, a permeate liquid conveying pipe and a concentrated salt liquid conveying pipe. One end, far away from the disc tube type reverse osmosis device, of the concentrated salt liquid conveying pipe extends to the upper part of each crystallization box, the concentrated salt liquid conveying pipe and the upper end of each crystallization box are jointly communicated with a first branch pipe, and a first rotating rod is jointly arranged on each crystallization box in a transverse rotating and penetrating manner; the right end of the first rotating rod is rotationally connected with the inner wall of the right side of the rightmost crystallization box, and two stirring rods which are oppositely arranged up and down are fixedly connected to the first rotating rod and in each crystallization box. The device has the advantages that the structure is simple, the crystallization separation effect is good, the pipeline blockage phenomenon is avoided, the working stability is high, and the cost is low.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment, and particularly to a crystallization separation system for treating waste brine. Background Art

[0002] Industrial waste brine is a very common type of wastewater in the industrial production process. Most chemical production and processing processes will generate waste brine, such as the post-treatment process of fine chemical synthesis, the refining process of petroleum, and so on. If the waste brine is directly discharged, it will cause very serious environmental problems, leading to soil salinization, death of aquatic organisms, and pollution of drinking water, posing a great health hazard to humans. By adopting a suitable industrial treatment method to separate the industrial salt in the waste brine, the environmental problems can be effectively solved. In addition, the separated industrial salt can be further utilized to turn waste into treasure. Among them, the crystallization method for separating industrial salt has low energy consumption and is relatively easy to obtain high-quality industrial salt, which is conducive to subsequent reuse.

[0003] In the existing waste brine purification and separation system, the working device has a complex structure, a large volume, high energy consumption, and the salt mud formed after evaporation crystallization in the crystallizer is likely to cause blockage in the pipe, thereby affecting the normal operation of the system.

[0004] To solve the above problems, we propose a crystallization separation system for treating waste brine. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems in the background art and propose a crystallization separation system for treating waste brine.

[0006] To achieve the above object, the present invention adopts the following technical solution: A crystallization separation system for treating waste brine, comprising a disc tube reverse osmosis device. A plurality of crystallization tanks are provided on the right side of the disc tube reverse osmosis device. The upper end of the disc tube reverse osmosis device is communicated with a waste brine delivery pipe, a permeate delivery pipe and a concentrated salt solution delivery pipe. One end of the concentrated salt solution delivery pipe far from the disc tube reverse osmosis device extends above each crystallization tank. The concentrated salt solution delivery pipe and the upper end of each crystallization tank are jointly communicated with a first branch pipe. A first rotating rod is horizontally and rotatably penetrated through each crystallization tank. The right end of the first rotating rod is rotatably connected to the right inner wall of the rightmost crystallization tank. Two stirring rods arranged up and down relatively are fixedly connected to the first rotating rod in each crystallization tank. A port block is fixedly connected to the lower end of each crystallization tank. A through hole communicating with the lower end of the crystallization tank is vertically opened in the port block. An electric valve is arranged in the through hole. A rotating groove is opened on the rear inner wall of the through hole at a position below the electric valve. An installation plate is provided on the right side of the disc tube reverse osmosis device. A driving motor is fixedly installed on the right side of the installation plate at a position corresponding to the rotating groove. The output end of the driving motor is fixedly connected to a second rotating rod. One end of the second rotating rod far from the driving motor is hermetically and rotatably penetrated through each rotating groove and is rotatably connected to the right inner wall of the rightmost rotating groove. A delivery pipe inclined downward from left to right and then downward is provided at the lower end of each port block. A rotating shaft is rotatably connected to the central axis position inside the delivery pipe. A spiral delivery blade is fixedly connected to the rotating shaft in a spiral manner. An upper connecting pipe is vertically communicated between the through hole position at the lower end of the port block and the upper end of the delivery pipe. A drying box is provided below the delivery pipe. A lower connecting pipe is vertically communicated between the upper end of the drying box and the lower end of each delivery pipe.

[0007] In the above-mentioned crystallization separation system for treating waste brine, a plurality of material pushing plates are fixedly connected to the second rotating rod at positions in each rotating groove.

[0008] In the above-mentioned crystallization separation system for treating waste brine, the left end of the first rotating rod extends to the left side of the leftmost crystallization tank, and a belt drive connection is provided between the output end of the driving motor and the left end of the first rotating rod.

[0009] In the above-mentioned crystallization separation system for treating waste brine, one end of each rotating shaft far from the drying box extends to the outside of the delivery pipe and is fixedly sleeved with a first bevel gear. A second bevel gear is fixedly sleeved on the second rotating rod at a position corresponding to each first bevel gear. Each second bevel gear meshes with the corresponding first bevel gear.

[0010] In the above-mentioned crystallization separation system for treating waste brine, a condensate water tank is provided on the right side of the drying box. An air extraction pump is fixedly installed at the upper end of the condensate water tank. The air extraction end of the air extraction pump is communicated with a steam delivery pipe. The end of the steam delivery pipe away from the air extraction pump extends to the upper ends of each crystallization box. A second branch pipe is commonly communicated between the steam delivery pipe and the upper side of one side of each crystallization box. The air outlet end of the air extraction pump is communicated with the upper end of the condensate water tank.

[0011] In the above-mentioned crystallization separation system for treating waste brine, two condensation plates are fixedly connected to the inner wall of the condensate water tank and are arranged obliquely and staggeredly up and down. A discharge pipe is communicated with the lower end of the condensate water tank.

[0012] Compared with the existing technology, the advantages of this crystallization separation system for treating waste brine are as follows:

[0013] 1. The waste brine first passes through the disc tube reverse osmosis device for preliminary separation, divided into concentrated salt solution and permeate. The high-purity concentrated salt solution is sent into multiple crystallization boxes for evaporation crystallization at the same time to form salt sludge, and the salt sludge is sent into the drying box through the conveying pipeline for drying work, and finally forms salt particles. The water vapor generated during the evaporation crystallization work is sent into the condensate water tank by the air extraction pump, and after liquefaction by the condensation plate, it is stored at the bottom of the condensate water tank. The structure of this system is simple and small in size. The disc tube reverse osmosis technology plus the evaporation crystallization process technology is suitable for treating high-COD and high-salt wastewater.

[0014] 2. By setting the stirring rod and the material pushing plate, during the evaporation crystallization work, the stirring rod can continuously stir to make the concentrated salt solution fully heated for good crystallization work. And after the salt sludge is formed, the material pushing plate can push the salt sludge so that it can smoothly enter the conveying pipeline through the through port without causing blockage of the through port. At the same time, by using the inclined conveying pipeline, the rotating shaft and the spiral conveying blades, when the salt sludge enters the conveying pipeline port, it can be smoothly sent into the drying box by the spiral conveying blades, without causing salt sludge residue on the inner wall and blockage of the conveying pipeline, ensuring the normal operation of the system.

[0015] 3. By setting a driving motor, the driving motor directly drives the material pushing plate to rotate through the second rotating rod, drives the first rotating rod to rotate through belt drive connection, and then drives the stirring rod to work. Through the meshing of the second bevel gear and the first bevel gear, it drives each rotating shaft and the spiral blade to rotate. Thus, one driving motor can drive the work of three links, greatly saving costs. Description of the Drawings

[0016] Figure 1 It is a structural perspective view of a crystallization separation system for treating waste brine proposed by the present invention;

[0017] Figure 2 For Figure 1Schematic diagram of the enlarged structure at A in the [original context, not provided in the text].

[0018] In the figure: 1 crystallization tank, 2 disk tube reverse osmosis device, 3 waste brine transfer pipe, 4 permeate transfer pipe, 5 concentrated salt solution transfer pipe, 6 first branch pipe, 7 first rotating rod, 8 stirring rod, 9 port block, 10 electric valve, 11 rotating groove, 12 second rotating rod, 13 material pushing plate, 14 mounting plate, 15 drive motor, 16 transfer pipeline, 17 rotating shaft, 18 spiral conveyor blade, 19 first bevel gear, 20 second bevel gear, 21 upper connecting pipe, 22 lower connecting pipe, 23 drying oven, 24 condensation water tank, 25 air extraction pump, 26 steam transfer pipe, 27 second branch pipe, 28 condensation plate, 29 discharge pipe. Detailed implementation manner

[0019] The following embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0020] Embodiment

[0021] Refer to Figure 1-2, A crystallization separation system for treating waste brine, including a disc tube reverse osmosis device 2. The disc tube reverse osmosis device 2 is a prior art and can separate high-concentration waste brine, which will not be described in detail here. There are multiple crystallization tanks 1 provided on the right side of the disc tube reverse osmosis device 2. The crystallization tanks 1 are of the prior art and have an evaporation crystallization function. The upper end of the disc tube reverse osmosis device 2 is connected to a waste brine delivery pipe 3, a permeate delivery pipe 4, and a concentrated salt solution delivery pipe 5, which are respectively connected to the liquid inlet, permeate discharge port, and concentrated salt solution discharge port of the disc tube reverse osmosis device 2. The end of the concentrated salt solution delivery pipe 5 away from the disc tube reverse osmosis device 2 extends above each crystallization tank 1. The concentrated salt solution delivery pipe 5 and the upper end of each crystallization tank 1 are jointly connected to a first branch pipe 6. A first rotating rod 7 is horizontally and rotatably penetrated through each crystallization tank 1. The right end of the first rotating rod 7 is rotatably connected to the right inner wall of the rightmost crystallization tank 1. On the first rotating rod 7 and within each crystallization tank 1, two stirring rods 8 are fixedly connected in an up-and-down opposite arrangement, which are used to stir the concentrated salt solution entering the crystallization tank 1 to enable it to fully carry out the evaporation crystallization work. A port block 9 is fixedly connected to the lower end of each crystallization tank 1. A through hole communicating with the lower end of the crystallization tank 1 is vertically opened in the port block 9. An electric valve 10 is provided in the through hole. A rotating groove 11 is opened on the rear inner wall of the through hole at a position below the electric valve 10. There is a mounting plate 14 provided on the right side of the disc tube reverse osmosis device 2. A driving motor 15 is fixedly installed on the right side of the mounting plate 14 at a position corresponding to the rotating groove 11. The output end of the driving motor 15 is fixedly connected to a second rotating rod 12. The end of the second rotating rod 12 away from the driving motor 15 is hermetically and rotatably penetrated through each rotating groove 11 and is rotatably connected to the right inner wall of the rightmost rotating groove 11. On the second rotating rod 12 and at the position within each rotating groove 11, a plurality of material pushing plates 13 are fixedly connected. After the electric valve 10 is opened, the rotation of the material pushing plates 13 can enable the sludge to smoothly enter the lower conveying pipeline 16 and prevent blockage. The left end of the first rotating rod 7 extends to the left side of the leftmost crystallization tank 1. A belt drive connection is provided between the output end of the driving motor 15 and the left end of the first rotating rod 7. The driving motor 15 can drive the rotation of the second rotating rod 12 and at the same time can drive the rotation of the first rotating rod 7.

[0022] A conveying pipe 16 is provided at the lower end of each port block 9 and is inclined downward from left to right. A rotating shaft 17 is rotatably connected to the central axis position inside the conveying pipe 16. A spiral conveying blade 18 is fixedly connected to the rotating shaft 17 in a spiral manner. A vertical upper connecting pipe 21 is jointly communicated between the through port position at the lower end of the port block 9 and the upper end of the conveying pipe 16. A drying box 23 is provided below the conveying pipe 16. A vertical lower connecting pipe 22 is jointly communicated between the upper end of the drying box 23 and the lower end of each conveying pipe 16. One end of each rotating shaft 17 far from the drying box 23 extends to the outside of the conveying pipe 16 and is fixedly sleeved with a first bevel gear 19. A second bevel gear 20 is fixedly sleeved on the second rotating rod 12 at the corresponding position of each first bevel gear 19. Each second bevel gear 20 is meshed with the corresponding first bevel gear 19. By the meshing of the first bevel gear 19 and the second bevel gear 20, the driving motor 15 can drive each rotating shaft 17 and the spiral conveying blade 18 to rotate, and then the salt sludge can be conveyed into the drying box 23 smoothly.

[0023] A condensing water tank 24 is provided on the right side of the drying box 23. An air extraction pump 25 is fixedly installed at the upper end of the condensing water tank 24. The air extraction end of the air extraction pump 25 is communicated with a steam conveying pipe 26. One end of the steam conveying pipe 26 far from the air extraction pump 25 extends to the upper end of each crystallization tank 1. A second branch pipe 27 is jointly communicated between the steam conveying pipe 26 and the upper end of one side of each crystallization tank 1. The air outlet end of the air extraction pump 25 is communicated with the upper end of the condensing water tank 24. Two condensation plates 28 which are arranged obliquely and staggered up and down are fixedly connected to the inner wall of the condensing water tank 24. A discharge pipe 29 is communicated with the lower end of the condensing water tank 24. The water vapor generated during evaporation crystallization can be sent into the condensing water tank 24 by the air extraction pump 25, and the condensation plates 28 are used to liquefy the water vapor. The condensation plates 28 arranged obliquely and staggered up and down can improve the liquefaction efficiency.

[0024] The working principle of the present invention is as follows:

[0025] The waste brine to be processed is sent into the disk tube reverse osmosis device 2 through the waste brine conveying pipe 3. After separation by the disk tube reverse osmosis device 2, concentrated brine and permeate are obtained. The permeate is discharged through the permeate conveying pipe 4. The obtained concentrated brine is sent into each crystallization tank 1 through the concentrated brine conveying pipe 5 and each first branch pipe 6, and evaporation crystallization work is carried out in each crystallization tank 1. During evaporation crystallization, the driving motor 15 works, and drives the first rotating rod 7 to rotate through belt drive connection, and then makes the stirring rods 8 in each crystallization tank 1 rotate, stirring the concentrated brine to make it evenly heated, and then quickly crystallize into salt mud. The water vapor during the evaporation crystallization process is sent into the condensation water tank 24 through the second branch pipe 27 and the steam conveying pipe 26 under the action of the air extraction pump 25. When the high-temperature water vapor contacts the inclined condensation plate 28, the water vapor is cooled and liquefied into water droplets. Each water droplet mixes into liquid water and flows downward along the condensation plate 28, and finally converges at the bottom inside the condensation water tank 24. The two staggered and inclined condensation plates 28 can be more effectively in contact with the water vapor, making the water vapor more fully liquefied.

[0026] After the concentrated brine is crystallized in the crystallization tank 1, the electric valve 10 is opened, and the salt mud in the crystallization tank 1 can enter the conveying pipeline 16 through the through port and the upper connecting pipe 21. At the same time, the driving motor 15 drives each dialing plate 13 to rotate through the second rotating rod 12, and dials the salt mud entering the through port to prevent the salt mud from blocking the through port and enabling it to smoothly enter the conveying pipeline 16. The driving motor 15 can drive the rotating shaft 17 and the spiral conveying blade 18 in each conveying pipeline 16 to rotate through the meshing of each second bevel gear 20 and the first bevel gear 19, and then smoothly send the salt mud located in the conveying pipeline 16 into the drying box 23 through the lower connecting pipe 22 for drying work to form dry salt particles.

[0027] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A crystallization separation system for treating waste brine, comprising a disk tube reverse osmosis device (2), characterized in that, On the right side of the disc tube reverse osmosis device (2), there are multiple crystallization tanks (1). The upper end of the disc tube reverse osmosis device (2) is connected to a waste brine delivery pipe (3), a permeate delivery pipe (4), and a concentrated salt solution delivery pipe (5). The end of the concentrated salt solution delivery pipe (5) far from the disc tube reverse osmosis device (2) extends above each crystallization tank (1). The concentrated salt solution delivery pipe (5) and the upper end of each crystallization tank (1) are jointly connected to a first branch pipe (6). A first rotating rod (7) is horizontally and rotatably penetrated through each crystallization tank (1). The right end of the first rotating rod (7) is rotatably connected to the right inner wall of the rightmost crystallization tank (1). On the first rotating rod (7) and inside each crystallization tank (1), two stirring rods (8) are fixedly connected and arranged up and down opposite to each other. A port block (9) is fixedly connected to the lower end of each crystallization tank (1). A through hole communicating with the lower end of the crystallization tank (1) is vertically opened in the port block (9). An electric valve (10) is arranged in the through hole. A rotating groove (11) is opened on the rear inner wall of the through hole at a position below the electric valve (10). An installation plate (14) is arranged on the right side of the disc tube reverse osmosis device (2). A driving motor (15) is fixedly installed on the right side of the installation plate (14) at a position corresponding to the rotating groove (11). The output end of the driving motor (15) is fixedly connected to a second rotating rod (12). The end of the second rotating rod (12) far from the driving motor (15) hermetically rotates through each rotating groove (11) and is rotatably connected to the right inner wall of the rightmost rotating groove (11). A delivery pipe (16) is arranged at the lower end of each port block (9) and is inclined downward from left to right. A rotating shaft (17) is rotatably connected to the central axis position inside the delivery pipe (16). A spiral delivery blade (18) is fixedly connected to the rotating shaft (17) in a spiral manner. A upper connecting pipe (21) is vertically and jointly connected between the through hole position at the lower end of the port block (9) and the upper end of the delivery pipe (16). A drying box (23) is arranged below the delivery pipe (16). A lower connecting pipe (22) is vertically and jointly connected between the upper end of the drying box (23) and the lower end of each delivery pipe (16).

2. The crystallization separation system for treating waste brine according to claim 1, wherein, A plurality of material shifting plates (13) are fixedly connected to the second rotating rod (12) at positions inside each rotating groove (11).

3. The crystallization separation system for treating waste brine according to claim 1, wherein, The left end of the first rotating rod (7) extends to the left side of the leftmost crystallization tank (1), and a belt drive connection is provided between the output end of the driving motor (15) and the left end of the first rotating rod (7).

4. A crystallization separation system for treating waste brine according to claim 1, characterized in that, The end of each rotating shaft (17) far from the drying box (23) extends outside the delivery pipe (16) and is fixedly sleeved with a first bevel gear (19). A second bevel gear (20) is fixedly sleeved on the second rotating rod (12) at a position corresponding to each first bevel gear (19). Each second bevel gear (20) meshes with the corresponding first bevel gear (19).

5. A crystallization separation system for waste brine treatment according to claim 1, characterized in that, A condensate water tank (24) is provided on the right side of the drying oven (23). An air extraction pump (25) is fixedly installed at the upper end of the condensate water tank (24). The air extraction end of the air extraction pump (25) is communicated with a steam delivery pipe (26). One end of the steam delivery pipe (26) far from the air extraction pump (25) extends to the upper ends of the respective crystallization tanks (1). A second branch pipe (27) is commonly communicated with the steam delivery pipe (26) and the upper ends of one sides of the respective crystallization tanks (1). The air outlet end of the air extraction pump (25) is communicated with the upper end of the condensate water tank (24).

6. The crystallization separation system for treating waste brine according to claim 5, characterized in that, Two condensation plates (28) which are fixedly connected to the inner wall of the condensate water tank (24) and are arranged obliquely in a vertically staggered manner are provided. A discharge pipe (29) is communicated with the lower end of the condensate water tank (24).

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