A salt scale treatment device applied to an evaporative crystallization system

Abstract

The utility model relates to a kind of salt scale processing device applied to evaporation crystallization system, comprising: crusher, it is located between the forced separator of evaporation crystallization system and the discharge pump of forced separator, crusher import is connected with export, and crusher export is connected with the import of discharge pump, and crusher is used to break salt scale in the material of forced separator output;Filter press, it is located between the mother liquor pump of evaporation crystallization system and feed pipe, and filter press import is connected with the export of mother liquor pump, and filter press filtrate export is connected to feed pipe, and filter press is used to filter small crystallization in mother liquor.This application breaks salt scale in material into small particles by crusher, reduces the influence on system operation;And mother liquor is filtered by filter press before being returned to feed pipe and re-entering system, reducing the content of small crystals in system, reducing the operating load of system, so as to ensure the continuous and stable operation of system.

Description

Technical Field

[0001] This utility model relates to the field of evaporation crystallization technology, and specifically to a scale treatment device applied to an evaporation crystallization system. Background Technology

[0002] Evaporation crystallization is widely used in the treatment and resource recovery of high-salinity wastewater. As a physical separation technology, evaporation crystallization evaporates water from wastewater through heating, causing solutes to crystallize and precipitate when the solutes reach a supersaturated state. This achieves highly efficient separation of salt and water, demonstrating significant advantages in the treatment of high-salinity wastewater. This process effectively removes salt from wastewater, significantly reducing wastewater volume, while simultaneously enabling the recovery and reuse of valuable solutes.

[0003] Due to the complex composition of the water, a large number of fine crystals and salt scale are easily generated in the separator during the evaporation, concentration and crystallization process of high-salt wastewater. The salt scale falling off and circulating with the liquid will have an adverse effect on the stable operation of the system. The accumulation of fine salt particles in the system will increase the load on the system operation, and in severe cases, it will lead to the system shutdown. Utility Model Content

[0004] Based on the above description, this utility model provides a scale treatment device for an evaporation crystallization system to solve the problem that a large number of fine crystals are easily generated in the separator and scale forms on the inner wall during the evaporation, concentration and crystallization process of high-salt wastewater. The scale falling off and circulating with the liquid will have an adverse effect on the stable operation of the system. The accumulation of fine salt particles in the system will increase the load on the system operation and may even lead to system shutdown in severe cases.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0006] This application provides a scale treatment device for an evaporation crystallization system, and the technical solution adopted is as follows:

[0007] A scale treatment device for use in an evaporation crystallization system, comprising:

[0008] A crusher is located between the forced separator and the discharge pump of the forced separator in the evaporation crystallization system. The inlet and outlet of the crusher are connected, and the outlet of the crusher is connected to the inlet of the discharge pump. The crusher is used to crush the scale in the material output by the forced separator.

[0009] A filter press is located between the mother liquor pump and the feed pipe of the evaporation and crystallization system. The filter press inlet is connected to the mother liquor pump outlet, and the filter press filtrate outlet is connected to the feed pipe. The filter press is used to filter out fine crystals in the mother liquor.

[0010] Preferably, it also includes a secondary mother liquor tank, which is located between the mother liquor pump and the filter press. The inlet of the secondary mother liquor tank is connected to the outlet of the mother liquor pump, and the outlet of the secondary mother liquor tank is connected to the inlet of the filter press through a filter press inlet pipe. A filter press feed pump is provided on the filter press inlet pipe.

[0011] Preferably, the top of the secondary mother liquor tank is provided with a mother liquor reflux port, and the mother liquor reflux port is connected to the filter press inlet pipe between the outlet of the filter press feed pump and the inlet of the filter press through a mother liquor reflux pipe.

[0012] Preferably, it also includes an vent pipe, one end of which is connected to a compressed air source, and the other end is connected to the filter press inlet pipe between the mother liquor return pipe and the filter press inlet.

[0013] Preferably, a valve is provided on the filter press inlet pipe between the drain pipe and the mother liquor return pipe.

[0014] Preferably, the filter press also includes a filtrate tank, which is located between the filter press and the feed pipe. The inlet of the filtrate tank is connected to the filtrate outlet of the filter press, and the outlet of the filtrate tank is connected to the feed pipe through a filtrate delivery pipe. A filtrate pump is provided on the filtrate delivery pipe.

[0015] Preferably, the top of the filtrate tank is provided with a filtrate reflux port, which is connected to the filtrate delivery pipe between the outlet of the filtrate pump and the feed pipe via a filtrate reflux pipe.

[0016] Preferably, a valve is provided on the filtrate delivery pipe between the filtrate return pipe and the feed pipe inlet.

[0017] Compared with the prior art, the technical solution of this application has at least the following beneficial technical effects:

[0018] 1. This application involves installing a crusher between the forced separator and the discharge pump of the forced separator in the evaporation crystallization system. The material output from the forced separator can be fed into the crusher, which breaks down the scale in the material into fine particles. The material after crushing is then pumped out by the discharge pump to the subsequent process to form mother liquor. Because the scale is broken down into small particles, its impact on system operation is reduced. Before being returned to the system through the feed pipe, the mother liquor undergoes filtration treatment by a filter press. The filter press removes some of the fine powder produced by scale crushing and the fine crystals produced by crystallization, thereby reducing the content of fine crystals in the system, lowering the system's operating load, and ensuring continuous and stable system operation. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the scale treatment device applied to an evaporation crystallization system provided in an embodiment of the present invention.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1. Crusher; 2. Filter press; 3. Steam compressor; 4. Separator; 5. Falling film evaporator; 6. Forced separator; 7. Forced heater; 8. Thickener; 9. Centrifuge; 10. Condensate pump; 11. Condensate tank; 12. Cooling water pump; 13. Falling film circulation pump; 14. Falling film transfer pump; 15. Forced circulation pump; 16. Discharge pump; 17. Mother liquor tank; 18. Mother liquor pump; 19. Feed pipe; 20. Secondary mother liquor tank; 21. Filter press inlet pipe; 22. Filter press feed pump; 23. Mother liquor return pipe; 24. Drain pipe; 25. Valve; 26. Pressure gauge; 27. Filtrate tank; 28. Filtrate delivery pipe; 29. ​​Filtrate pump; 30. Filtrate output pipe; 31. Filtrate return pipe. Detailed Implementation

[0022] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0024] It is understood that spatial relation terms such as "below," "under," "below," "below," "above," "above," etc., can be used here to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, the element or feature described as "below" or "below" of the other element or feature will be oriented "above" the other element or feature. Therefore, the exemplary terms "below" and "below" can include both upper and lower orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein will be interpreted accordingly.

[0025] It should be noted that when one element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediary element. In the following embodiments, "connection" should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have the transmission of electrical signals or data between them.

[0026] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising,” “including,” or “having,” etc., specify the presence of the stated feature, whole, step, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0027] Reference Figure 1 As shown in the illustration, this application provides a scale treatment device for an evaporation crystallization system, including a crusher 1 and a filter press 2. The crusher 1 is located between the forced separator 6 and the discharge pump 16 of the forced separator 6 in the evaporation crystallization system. The inlet and outlet of the crusher 1 are connected, and the outlet of the crusher 1 is connected to the inlet of the discharge pump 16. The crusher 1 is used to crush scale in the material output from the forced separator 6. The filter press 2 is located between the mother liquor pump 18 and the feed pipe 19 of the evaporation crystallization system. The inlet of the filter press 2 is connected to the outlet of the mother liquor pump 18, and the filtrate outlet of the filter press 2 is connected to the feed pipe 19. The filter press 2 is used to filter fine crystals in the mother liquor.

[0028] Reference Figure 1 As shown, specifically, the evaporation crystallization system mainly includes a steam compressor 3, a separator 4, a falling film evaporator 5, a forced separator 6, a forced heater 7, a thickener 8, a centrifuge 9, a condensate pump 10, a condensate tank 11, a cooling water pump 12, a falling film circulation pump 13, a falling film transfer pump 14, a forced circulation pump 15, a discharge pump 16, a mother liquor tank 17, and a mother liquor pump 18.

[0029] Reference Figure 1 As shown, the outlet of the system feed pipe 19 is connected to the falling film evaporator 5. The lower part of the falling film evaporator 5 is connected to the inlet of the falling film circulation pump 13 through a pipe. The outlet of the falling film circulation pump 13 is connected to the top of the falling film evaporator 5 through a pipe. The lower part of the falling film evaporator 5 is also connected to the inlet of the falling film transfer pump 14 through a pipe. The outlet of the falling film transfer pump 14 is connected to the forced circulation material pipe.

[0030] Reference Figure 1 As shown, the bottom of the forced separator 6 is connected to the inlet of the forced circulation pump 15 through a forced circulation material pipe, the outlet of the forced circulation pump 15 is connected to the bottom of the forced heater 7 through a material circulation pipe, the top of the forced heater 7 is connected to the middle of the forced separator 6 through a material circulation pipe, the bottom of the forced separator 6 is also connected to the inlet of the discharge pump 16 through a pipe, and the outlet of the discharge pump 16 is connected to the feed port of the thickener 8 through a crystal slurry output pipe.

[0031] Reference Figure 1As shown, the thickener 8 has an overflow port at the top, which is connected to the overflow inlet at the top of the mother liquor tank 17 via a pipe. The thickener 8 has a discharge port at the bottom, which is connected to the feed inlet of the centrifuge 9 via a pipe. The solid material obtained from the solid discharge port of the centrifuge 9 is sent out of the system. The liquid discharge port of the centrifuge 9 is connected to the centrifugal mother liquor inlet at the top of the mother liquor tank 17 via a pipe. The mother liquor tank 17 has an overflow port at the top, which is connected to the trench via a pipe. The discharge port at the bottom of the mother liquor tank 17 is connected to the inlet of the mother liquor pump 18 via a pipe. The outlet pipe of the mother liquor pump 18 is connected to the outside via a mother liquor discharge pipe. The outlet pipe of the mother liquor pump 18 is also connected to the inlet of the system feed pipe 19 via a mother liquor discharge pipe.

[0032] Reference Figure 1 As shown, the condensate outlet of the falling film evaporator 5 is connected to the condensate tank 11, the condensate outlet of the forced heater 7 is connected to the condensate tank 11, the vapor port at the top of the condensate tank 11 is connected to the balance port of the falling film evaporator 5 through a pipe, the bottom outlet of the distillation water tank is connected to the inlet of the condensate pump 10 through a pipe, the outlet of the distillation water pump is connected to the distillation water discharge pipe through the condensate supply pipe, the bottom outlet of the distillation water tank is also connected to the inlet of the cooling water pump 12 through a pipe, and the outlet of the cooling water pump 12 is connected to the outlet of the steam compressor 3 through a pipe.

[0033] Reference Figure 1 As shown, the secondary steam inlet of separator 4 is connected to the secondary steam outlet of falling film evaporator 5 via a pipeline. The secondary steam inlet of separator 4 is also connected to the secondary steam outlet of forced separator 6 via a pipeline. The secondary steam outlet of separator 4 is connected to the inlet of steam compressor 3. The outlet of steam compressor 3 is connected to the steam inlet of falling film evaporator 5 via a pipeline. The outlet of steam compressor 3 is also connected to the steam inlet of forced heater 7 via a pipeline.

[0034] The specific structure and function of each device in the above-mentioned evaporation crystallization system are all existing technologies and will not be described in detail here.

[0035] Reference Figure 1 As shown, the bottom outlet of the forced separator 6 is connected to the inlet of the crusher 1 via a pipe, while the inlet of the discharge pump 16 is connected to the outlet of the crusher 1 via a pipe. A valve 25 is installed on the pipe between the outlet of the crusher 1 and the inlet of the discharge pump 16 to control the on / off state. The material output from the forced separator 6 can be fed into the crusher 1, where the crusher 1 breaks down the scale in the material into fine particles. The material after passing through the crusher 1 is then discharged by the discharge pump 16 to the subsequent process to circulate and form mother liquor. Because the scale is broken down into small particles, the impact on system operation can be reduced.

[0036] Reference Figure 1As shown, the outlet of the mother liquor pump 18 is connected to the inlet of the filter press 2 through a pipeline, and the inlet of the system feed pipe 19 is connected to the filtrate outlet of the filter press 2 through a pipeline. The mother liquor pump 18 outputs mother liquor and inputs it into the filter press 2. After being filtered by the filter press 2, some of the fine powder produced by the crushing of salt scale and the fine crystals produced by crystallization are removed from the mother liquor. The filtered mother liquor is then returned to the system, which reduces the content of fine crystals in the system, reduces the operating load of the system, and thus ensures the continuous and stable operation of the system.

[0037] The filter cake from filter press 2 is processed by an external conveying system.

[0038] Reference Figure 1 As shown, a secondary mother liquor tank 20 is further provided between the mother liquor pump 18 and the filter press 2. The inlet of the secondary mother liquor tank 20 is connected to the outlet of the mother liquor pump 18, and the outlet of the secondary mother liquor tank 20 is connected to the inlet of the filter press 2 through the filter press inlet pipe 21. A filter press feed pump 22 is provided on the filter press inlet pipe 21. The mother liquor pumped out by the mother liquor pump 18 is first temporarily stored in the secondary mother liquor tank 20. When the filter press 2 is fed, the filter press feed pump 22 pumps the mother liquor from the secondary mother liquor tank 20 into the filter press 2. When the filter press 2 is working, the mother liquor pump 18 can continuously run to input the mother liquor into the secondary mother liquor tank 20 without discharging the mother liquor outside the system, thus reducing the waste of mother liquor.

[0039] The secondary mother liquor tank 20 is equipped with stirring blades within its axis to agitate the mother liquor in the secondary mother liquor tank 20 and prevent the deposition of fine crystals.

[0040] Reference Figure 1 As shown, specifically, the secondary mother liquor tank 20 is cylindrical with a vertical axis, and the outlet of the secondary mother liquor tank 20 is located on the side wall near the bottom. A stirring blade is located at the bottom of the mother liquor tank 17, arranged radially along the tank. The stirring blade is driven by a motor mounted on the outer wall of the secondary mother liquor tank 20, with the motor output shaft passing through the side wall and forming a rotary seal. This arrangement allows the mother liquor in the bottom area of ​​the secondary mother liquor tank 20 to flow radially when the stirring blade rotates, thus sufficiently agitating the bottom mother liquor to prevent the deposition of fine crystals. Furthermore, the liquid driven by the stirring blade is directly pumped out by the filter press feed pump 22, ensuring that fine crystals are pumped into the filter press 2 along with the mother liquor.

[0041] Reference Figure 1 As shown, a mother liquor reflux port is also provided at the top of the secondary mother liquor tank 20. The mother liquor reflux port is connected to the filter press feed pipe 21 between the outlet of the filter press feed pump 22 and the inlet of the filter press 2 through the mother liquor reflux pipe 23.

[0042] It is also equipped with an vent pipe 24, one end of which is connected to the compressed air source, and the other end is connected to the filter press inlet pipe 21 between the mother liquor return pipe 23 and the inlet of the filter press 2.

[0043] Reference Figure 1 As shown, valves 25 are installed on the filter press inlet pipe 21 between the outlet of the secondary mother liquor tank 20 and the inlet of the filter press feed pump 22, on the filter press inlet pipe 21 between the mother liquor return pipe 23 and the drain pipe 24 to control the on / off state. Two pressure gauges 26 are installed on the filter press inlet pipe 21. One pressure gauge 26 is installed between the filter press feed pump 22 and the mother liquor return pipe 23 as a local pressure gauge 26, and the other is installed between the drain pipe 24 and the filter press 2, with the display end located at the control center as a remote pressure gauge 26.

[0044] When feeding material into the filter press 2, valve 25 on the filter press inlet pipe 21 remains open, while valves 25 on the mother liquor return pipe 23 and the drain pipe 24 are closed. When the pressure value on the pressure gauge 26 reaches the set value, it indicates that feeding into the filter press 2 is complete. At this time, valve 25 on the filter press inlet pipe 21, located between the mother liquor return pipe 23 and the drain pipe 24, is closed, and valves 25 on the mother liquor return pipe 23 and the drain pipe 24 are opened. Meanwhile, the filter press feed pump 22 continues to operate, pumping the mother liquor out of the secondary mother liquor tank 20 and then returning it to the secondary mother liquor tank 20 via the mother liquor return pipe 23, thus circulating the mother liquor to further prevent the deposition of fine crystals. Simultaneously, the compressed air source is turned on, pumping air into the filter press inlet pipe 21 through the drain pipe 24 to discharge the residual mother liquor in the filter press inlet pipe 21 into the filter press 2, thereby preventing the deposition of fine crystals from the residual mother liquor in the filter press inlet pipe 21 on the pipe wall and causing blockage. The valve 25 on the filter press feed pipe 21, located between the outlet of the secondary mother liquor tank 20 and the inlet of the filter press feed pump 22, is closed when equipment maintenance is required.

[0045] Furthermore, a filtrate tank 27 is provided between the filtrate outlet of the filter press 2 and the system feed pipe 19. The inlet of the filtrate tank 27 is connected to the filtrate outlet of the filter press 2, and the outlet of the filtrate tank 27 is connected to the feed pipe 19 through a filtrate delivery pipe 28, on which a filtrate pump 29 is provided. Specifically, the filtrate outlet of the filter press 2 is connected to the filtrate tank 27 through a filtrate output pipe 30. The filtrate from the filter press 2 is temporarily stored in the filtrate tank 27. When it is not necessary to return the filtrate to the feed pipe 19, the filter press 2 can continue to work to filter the mother liquor.

[0046] The top of the filtrate tank 27 is provided with a filtrate return port, which is connected to the filtrate delivery pipe 28 between the outlet of the filtrate pump 29 and the feed pipe 19 through the filtrate return pipe 31.

[0047] Valves 25 are provided on the filtrate delivery pipe 28 between the filtrate tank 27 and the inlet of the filtrate pump 29, on the filtrate return pipe 31 between the filtrate delivery pipe 28 and the inlet of the feed pipe 19, and on the filtrate return pipe 31. A pressure gauge 26 is provided on the filtrate delivery pipe 28 between the leaf pump and the filtrate return pipe 31. This pressure gauge 26 serves as a field pressure gauge to detect the outlet pressure of the filtrate pump 29.

[0048] When filtrate is pumped into the feed pipe 19, all valves 25 on the filtrate delivery pipe 28 are open. When pumping filtrate is not required, the valve 25 on the filtrate delivery pipe 28 located between the filtrate return pipe 31 and the inlet of the feed pipe 19 is closed, while the valve 25 on the filtrate return pipe 31 is open. The filtrate is pumped out of the filtrate tank 27 and then returned to the filtrate tank 27 via the filtrate return pipe 31, thus circulating the filtrate to avoid the deposition of residual fine crystals. The valve 25 on the filtrate delivery pipe 28 located between the filtrate tank 27 and the inlet of the filtrate pump 29 is closed during equipment maintenance. The above description is only a preferred embodiment of this utility model and is not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A scale treatment device for use in an evaporation crystallization system, characterized in that, include: A crusher (1) is located between the forced separator (6) of the evaporation crystallization system and the discharge pump (16) of the forced separator (6). The inlet and outlet of the crusher (1) are connected, and the outlet of the crusher (1) is connected to the inlet of the discharge pump (16). The crusher (1) is used to crush the scale in the material output by the forced separator (6). A filter press (2) is located between the mother liquor pump (18) and the feed pipe (19) of the evaporation crystallization system. The inlet of the filter press (2) is connected to the outlet of the mother liquor pump (18), and the filtrate outlet of the filter press (2) is connected to the feed pipe (19). The filter press (2) is used to filter out fine crystals in the mother liquor.

2. The scale treatment device for an evaporation crystallization system according to claim 1, characterized in that: It also includes a secondary mother liquor tank (20), which is located between the mother liquor pump (18) and the filter press (2). The inlet of the secondary mother liquor tank (20) is connected to the outlet of the mother liquor pump (18), and the outlet of the secondary mother liquor tank (20) is connected to the inlet of the filter press (2) through the filter press inlet pipe (21). The filter press inlet pipe (21) is equipped with a filter press feed pump (22).

3. The scale treatment device for an evaporation crystallization system according to claim 2, characterized in that: The top of the secondary mother liquor tank (20) is provided with a mother liquor reflux port. The mother liquor reflux port is connected to the filter press feed pipe (21) between the outlet of the filter press feed pump (22) and the inlet of the filter press (2) through a mother liquor reflux pipe (23). A valve (25) is provided on the mother liquor reflux pipe (23).

4. The scale treatment device for an evaporation crystallization system according to claim 3, characterized in that: It also includes an vent pipe (24), one end of which is connected to a compressed air source, and the other end is connected to the filter press inlet pipe (21) between the mother liquor return pipe (23) and the filter press inlet (2).

5. The scale treatment device for an evaporation crystallization system according to claim 4, characterized in that: A valve (25) is provided on the filter press inlet pipe (21) between the drain pipe (24) and the mother liquor return pipe (23).

6. The scale treatment device for an evaporation crystallization system according to claim 1, characterized in that: It also includes a filtrate tank (27), which is located between the filter press (2) and the feed pipe (19). The inlet of the filtrate tank (27) is connected to the filtrate outlet of the filter press (2), and the outlet of the filtrate tank (27) is connected to the feed pipe (19) through a filtrate delivery pipe (28). A filtrate pump (29) is provided on the filtrate delivery pipe (28).

7. The scale treatment device for an evaporation crystallization system according to claim 6, characterized in that: The top of the filtrate tank (27) is provided with a filtrate return port, which is connected to the filtrate delivery pipe (28) between the outlet of the filtrate pump (29) and the feed pipe (19) through a filtrate return pipe (31).

8. The scale treatment device for an evaporation crystallization system according to claim 7, characterized in that: A valve (25) is provided on the filtrate delivery pipe (28) between the filtrate return pipe (31) and the inlet of the feed pipe (19).

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