A crystallization quality regulating device of a high-salinity wastewater evaporation crystallization system

Abstract

The utility model discloses a crystallization quality regulation and control device of high salt wastewater evaporation crystallization system, including evaporation crystallizer, hydrocyclone, mother liquor refining jar, the crystal pulp discharge port of evaporation crystallizer bottom is connected through the pipeline and goes into the feed pump, the feed pump's outlet is connected to the feed pipe of hydrocyclone, the underflow port of hydrocyclone is connected with the three -way joint, one way of three -way joint is connected with centrifuge, another way connects the seed crystal slurry reflux pipe, the seed crystal slurry reflux pipe other end is connected with evaporation crystallizer middle lower part, and the overflow port of hydrocyclone is connected with overflow pipe. Through the innovative combination of hydrocyclone, mother liquor refining jar and two reflux pipe lines, a closed loop control system on the physical structure is formed, and the structure realizes the " classification - refining - reflux " of crystal pulp, not only eliminates fine crystal, but also converts it into useful resources.

Description

Technical Field

[0001] This utility model relates to the technical field of high-salt wastewater treatment equipment, specifically a crystallization quality control device for a high-salt wastewater evaporation crystallization system. Background Technology

[0002] In the treatment of high-salinity wastewater, evaporation crystallization is the core process. However, the fine crystals (fine crystals) generated within the crystallizer can severely affect the purity and particle size of the final salt product. Existing technologies typically employ a "fine crystal removal" device, which directly discharges the mother liquor containing fine crystals from the system. While this optimizes crystallization to some extent, it leads to the following problems: 1. Waste of resources: The discharged mother liquor still contains a large amount of recyclable water and solutes, which reduces the overall recovery rate of the system.

[0003] 2. Secondary pollution: The discharge of high-concentration mother liquor increases the load on subsequent treatment and the risk of environmental pollution.

[0004] 3. Unstable product quality: Simple discharge makes it difficult to accurately control the number of crystal nuclei in the crystallizer, resulting in uneven product particle size.

[0005] Therefore, there is an urgent need for a device that can fundamentally solve the problem of fine crystals from a structural perspective while improving the recovery rate. Utility Model Content

[0006] The purpose of this invention is to provide a crystallization quality control device for a high-salt wastewater evaporation crystallization system, which can effectively remove fine crystals, promote the growth of large crystal particles, and realize the internal circulation of materials, thereby significantly improving the system recovery rate.

[0007] To achieve the above objectives, a crystallization quality control device for a high-salt wastewater evaporation crystallization system is provided, comprising an evaporator crystallizer, a hydrocyclone, and a mother liquor refining tank. The crystal slurry outlet at the bottom of the evaporator crystallizer is connected to a feed pump via a pipeline, and the outlet of the feed pump is connected to the feed pipe of the hydrocyclone. The underflow port of the hydrocyclone is connected to a three-way connector. One of the three-way connectors is connected to a centrifuge, and the other is connected to a seed slurry return pipe. The other end of the seed slurry return pipe is connected to the lower part of the evaporator crystallizer. The overflow port of the hydrocyclone is connected to an overflow pipe, which is connected to the liquid inlet at the top of the mother liquor refining tank. The top of the mother liquor refining tank is equipped with a stirrer, and the bottom of the mother liquor refining tank is equipped with a heating element. A filter is installed at the clear liquid outlet on the side wall of the mother liquor refining tank, and the outlet end of the filter is connected to the mother liquor return pipe. One end of the mother liquor return pipe is connected to the feed end of the evaporator crystallizer.

[0008] According to the crystallization quality control device of the high-salt wastewater evaporation crystallization system, a first valve is provided on the seed slurry reflux pipe.

[0009] According to the crystallization quality control device of the high-salt wastewater evaporation crystallization system, the stirring component includes a motor, and the output shaft of the motor is fixedly connected to a stirring rod.

[0010] According to the crystallization quality control device of the high-salt wastewater evaporation crystallization system, the heating element is a coil heater or a jacketed heater.

[0011] According to the crystallization quality control device of the high-salt wastewater evaporation crystallization system, a second valve is provided on the mother liquor reflux pipe.

[0012] According to the crystallization quality control device of the high-salt wastewater evaporation crystallization system, a discharge pipe is provided on one side of the mother liquor refining tank.

[0013] Compared with the prior art, the beneficial effects of this utility model are: 1. The crystallization quality control device of the high-salt wastewater evaporation crystallization system innovatively combines a hydrocyclone, a mother liquor refining tank and two reflux pipelines to form a closed-loop control system in terms of physical structure. This structure realizes the "grading-refining-reflux" of crystal slurry, which not only eliminates fine crystals, but also transforms them into useful resources.

[0014] 2. The crystallization quality control device of the high-salt wastewater evaporation crystallization system continuously sends large-particle seed crystals back to the crystallizer through the seed slurry return pipeline, which structurally ensures that there are always sufficient crystal nuclei in the crystallizer, so that the produced salt crystal particles are large, uniform and pure.

[0015] 3. The crystallization quality control device of this high-salt wastewater evaporation crystallization system, through the design of the mother liquor refining tank and the mother liquor return pipeline, enables the fine crystals to be dissolved and returned to the system, realizing the internal circulation of materials, increasing the system water recovery rate from about 90% in the traditional method to more than 98%, and basically eliminating waste liquid discharge.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments; Figure 1 This is a schematic diagram of the crystallization quality control device for a high-salt wastewater evaporation crystallization system according to the present invention.

[0018] In the diagram: 1. Evaporator crystallizer; 2. Hydrocyclone; 3. Feed pump; 4. Feed pipe; 5. T-junction; 6. Seed slurry return pipe; 7. First valve; 8. Centrifuge; 9. Overflow pipe; 10. Mother liquor refining tank; 11. Motor; 12. Stirring rod; 13. Heating element; 14. Filter; 15. Mother liquor return pipe; 16. Second valve; 17. Discharge pipe. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1 This utility model provides a technical solution: a crystal quality control device for a high-salt wastewater evaporation crystallization system, including an evaporator crystallizer 1, a hydrocyclone 2, and a mother liquor refining tank 10. The crystal slurry outlet at the bottom of the evaporator crystallizer 1 is connected to a feed pump 3 through a pipe. The outlet of the feed pump 3 is connected to the feed pipe 4 of the hydrocyclone 2. The bottom outlet of the hydrocyclone 2 is connected to a three-way interface 5. One end of the three-way connector 5 is connected to a centrifuge 8 for separating the finished salt, and the other end is connected to a seed slurry return pipe 6. Large seed crystals are continuously returned to the crystallizer through the seed slurry return pipe 6, structurally ensuring a sufficient supply of crystal nuclei within the crystallizer, resulting in large, uniform, and pure salt crystals. The other end of the seed slurry return pipe 6 is connected to the lower part of the evaporator crystallizer 1. The overflow port of the hydrocyclone 2 is connected to an overflow pipe 9, which is connected to the inlet at the top of the mother liquor refining tank 10. A stirring element is installed at the top of the mother liquor refining tank 10, and a heating element 13 is installed at the bottom. A filter 14 is installed at the clear liquid outlet on the side wall of the mother liquor refining tank 10 to ensure... The returned clear liquid is free of suspended particles. The outlet end of filter 14 is connected to mother liquor return pipe 15. Through the design of mother liquor refining tank 10 and mother liquor return pipe 15, fine crystals are dissolved and returned to the system, realizing internal circulation of materials. The system water recovery rate is increased from about 90% in the traditional method to more than 98%, with virtually no waste liquid discharge. One end of mother liquor return pipe 15 is connected to the feed end of evaporator crystallizer 1. By innovatively combining hydrocyclone 2, mother liquor refining tank 10 and two return pipes, a closed-loop control system in physical structure is formed. This structure realizes the "grading-refining-returning" of crystal slurry, which not only eliminates fine crystals but also transforms them into useful resources.

[0021] A first valve 7 is installed on the seed slurry reflux pipe 6, and a second valve 16 is installed on the mother liquor reflux pipe 15. By adjusting the first valve 7 and the second valve 16, the reflux flow rate can be controlled to achieve the best regulation effect.

[0022] The stirring component includes a motor 11, and the output shaft of the motor 11 is fixedly connected to a stirring rod 12 to facilitate stirring of the liquid in the mother liquor refining tank 10.

[0023] The heating element 13 is a coil heater or a jacketed heater, which facilitates heating of the liquid in the mother liquor refining tank 10.

[0024] A discharge pipe 17 is provided on one side of the mother liquor refining tank 10 to facilitate the discharge of liquid from the mother liquor refining tank 10.

[0025] Working principle: During use, after the crystal slurry is separated by the hydrocyclone 2, the large particles are discharged from the bottom outlet, and part of them are returned as seed crystals. The overflow containing fine crystals enters the mother liquor refining tank 10, where it is heated, stirred and dissolved. The supernatant is filtered through the filter 14 and then returned to the front end of the system. The return flow can be controlled by adjusting the first valve 7 and the second valve 16 to achieve the best control effect.

[0026] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A crystallization quality control device for a high-salt wastewater evaporation crystallization system, comprising an evaporator crystallizer (1), a hydrocyclone (2), and a mother liquor refining tank (10), characterized in that, The crystal slurry outlet at the bottom of the evaporator crystallizer (1) is connected to the feed pump (3) via a pipe. The outlet of the feed pump (3) is connected to the feed pipe (4) of the hydrocyclone (2). The bottom outlet of the hydrocyclone (2) is connected to a three-way interface (5). One of the three-way interfaces (5) is connected to a centrifuge (8), and the other is connected to a seed slurry return pipe (6). The other end of the seed slurry return pipe (6) is connected to the lower part of the evaporator crystallizer (1). The overflow port of the hydrocyclone (2) is connected to an overflow pipe (9). The overflow pipe (9) is connected to the liquid inlet at the top of the mother liquor refining tank (10). The top of the mother liquor refining tank (10) is equipped with a stirring element. The bottom of the mother liquor refining tank (10) is equipped with a heating element (13). A filter (14) is installed at the clear liquid outlet on the side wall of the mother liquor refining tank (10). The outlet end of the filter (14) is connected to a mother liquor return pipe (15). One end of the mother liquor return pipe (15) is connected to the feed end of the evaporator crystallizer (1).

2. The crystallization quality control device for a high-salt wastewater evaporation crystallization system as described in claim 1, characterized in that: A first valve (7) is provided on the seed slurry reflux pipe (6).

3. The crystallization quality control device for a high-salt wastewater evaporation crystallization system as described in claim 1, characterized in that: The stirring component includes a motor (11), and the output shaft of the motor (11) is fixedly connected to a stirring rod (12).

4. The crystallization quality control device for a high-salt wastewater evaporation crystallization system as described in claim 1, characterized in that: The heating element (13) is a coil heater or a jacketed heater.

5. The crystallization quality control device for a high-salt wastewater evaporation crystallization system as described in claim 1, characterized in that: A second valve (16) is provided on the mother liquor return pipe (15).

6. The crystallization quality control device of a high-salinity wastewater evaporative crystallization system of claim 1, wherein: A discharge pipe (17) is provided on one side of the mother liquor refining tank (10).

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