DTRO salt separation device for sodium sulfate strong brine

Abstract

The utility model belongs to the technical field of DTRO (Disk Tubular Reverse Osmosis), and particularly relates to a DTRO salt separation device for sodium sulfate strong brine. According to the utility model, the air inlet is formed in the DTRO device, and the air compression device is arranged, so that sodium sulfate strong brine in the DTRO device is stirred by using compressed air, the turbulence effect is increased, and the adhesion phenomenon of silicon, organic matters and calcium and magnesium ions on the surface of a membrane is reduced; meanwhile, a sodium hydroxide pipeline is arranged on a pipeline for connecting a strong brine outlet of the silicon removal device and the DTRO device, and sodium hydroxide is added into the DTRO device, so that organic matters in the DTRO device are removed, and the blockage condition of the organic matters to a membrane is relieved; according to the utility model, the turbulence effect in the DTRO device is increased and organic matters are removed, so that the blockage condition of a membrane of the DTRO device is effectively reduced, the running time of the DTRO device is prolonged, meanwhile, the frequency of stopping and cleaning the DTRO device is also reduced, and the cleaning cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of DTRO, and specifically relates to a DTRO salt separation device for sodium sulfate concentrated brine. Background Art

[0002] The production operation of coal chemical enterprises consumes a large amount of water. In order to save water, enterprises treat water such as sewage discharged from the circulating water device, concentrated desalted water, reclaimed water after sewage treatment, and backwash water of the reuse water device through methods such as COD degradation, hardness removal, filtration, and reverse osmosis to obtain reuse water, and then send the reuse water back to the production device, thereby reducing the water consumption of the enterprise.

[0003] However, while producing reuse water, enterprises also generate a part of sodium sulfate concentrated brine. This part of sodium sulfate concentrated brine separates sodium sulfate in the concentrated brine through the combination of DTRO (disc tube reverse osmosis) and freezing crystallization technology. However, this part of sodium sulfate concentrated brine also contains silicon, a small amount of organic matter, and calcium and magnesium ions, which causes the membrane sheets of the DTRO device to become blocked after running for a short time. Especially when the silicon content and organic matter content in the sodium sulfate concentrated brine are relatively high, the membrane sheets of the DTRO device become blocked after running for two days, forcing the DTRO device to stop for membrane cleaning. Frequent membrane blockage makes it difficult for the DTRO device to operate stably for a long time. Content of the Utility Model

[0004] Based on the problems in the prior art, the utility model provides a DTRO salt separation device for sodium sulfate concentrated brine. The utility model makes the membrane sheets of the DTRO device not easily blocked, greatly reduces the cleaning frequency of the DTRO device, reduces the cleaning cost, enables the DTRO device to operate stably for a long time, and the utility model can also adapt to sodium sulfate concentrated brine with high silicon and high organic matter.

[0005] In order to solve the above technical problems, the technical solution of the utility model is as follows:

[0006] A DTRO salt separation device for concentrated sodium sulfate brine, comprising a concentrated sodium sulfate brine buffer tank, a DTRO device, and a silicon removal device. The outlet of the concentrated sodium sulfate brine buffer tank is connected to the silicon removal device through a concentrated sodium sulfate brine pump and a pipeline. The concentrated brine outlet of the silicon removal device is connected to the DTRO device through a DTRO feed pump and a pipeline. The concentrated water outlet of the DTRO device is connected to a gas-liquid separator a through a pipeline. The water outlet of the gas-liquid separator a is connected to a concentrated water buffer tank through a pipeline. The product water outlet of the DTRO device is connected to a gas-liquid separator b through a pipeline. The water outlet of the gas-liquid separator b is connected to a product water buffer tank through a pipeline. The gas outlets of the gas-liquid separator a and the gas-liquid separator b are both connected to the inlet of an air compression device through pipelines. The outlet of the air compression device is connected to the air inlet of the DTRO device through a pipeline. An air filter communicating with the atmosphere is also provided at the inlet of the air compression device.

[0007] Further, the air compression device includes a high-pressure air compressor and a low-pressure air compressor. The inlet of the low-pressure air compressor is connected to the gas-liquid separator b through a pipeline, and the inlet of the low-pressure air compressor is also connected to the atmosphere through an air filter. The outlet of the low-pressure air compressor is connected to the inlet of the high-pressure air compressor through a pipeline. The inlet of the high-pressure air compressor is also connected to the gas outlet of the gas-liquid separator a through a pipeline. The outlet of the high-pressure air compressor is connected to the air inlet of the DTRO device through a pipeline.

[0008] Further, a demister b and an air buffer tank a are provided on the pipeline connecting the low-pressure air compressor and the gas-liquid separator b. An air buffer tank b is provided on the pipeline connecting the outlet of the low-pressure air compressor and the inlet of the high-pressure air compressor. A demister a and an air buffer tank c are provided on the pipeline connecting the high-pressure air compressor and the gas-liquid separator a. An air buffer tank d is provided on the pipeline connecting the outlet of the high-pressure air compressor and the air inlet of the DTRO device.

[0009] Further, the pipeline connecting the concentrated brine outlet of the silicon removal device and the DTRO device is also connected to a sodium hydroxide pipeline.

[0010] Further, the DTRO device includes a cylindrical shell with open ends at both ends, an upper end cover, a lower end cover, a diaphragm, and a flow guide plate. A number of flow guide plates and a number of diaphragms are stacked at intervals and assembled in the cylindrical shell through a central pull rod, an upper end cover, a lower end cover, a water production outlet device, an upper nut, and a lower nut. The space enclosed by the cylindrical shell, the upper end cover, the lower end cover, and a number of flow guide plates is an air passage, and the space enclosed by the flow guide plate, the diaphragm, the upper end cover, and the lower end cover is a concentrated water passage. Circular holes a are provided on the side surface of the flow guide plate to connect the inner cavity of the flow guide plate with the air passage, and a number of circular holes b are provided on the upper and lower discs of the flow guide plate to connect the concentrated water passage with the inner cavity of the flow guide plate; a concentrated water passage outlet is provided on the upper end cover, and an air passage inlet and a concentrated water passage inlet are provided on the lower end cover. Beneficial effects

[0011] In the present utility model, an air inlet is provided on the DTRO device, and an air compression device is provided. Compressed air is used to stir the concentrated sodium sulfate brine in the DTRO device, increasing the turbulence effect and reducing the adhesion of silicon, organic matter, calcium, and magnesium ions on the membrane surface; at the same time, a sodium hydroxide pipeline is provided on the pipeline connecting the concentrated water outlet of the silicon removal device and the DTRO device. By adding sodium hydroxide to the DTRO device, the organic matter in the DTRO device is removed, reducing the blockage of the membrane by organic matter; through increasing the turbulence effect in the DTRO device and removing organic matter, the present utility model effectively reduces the blockage of the membrane of the DTRO device, extends the operation time of the DTRO device, reduces the frequency of parking and cleaning of the DTRO device, and reduces the cleaning cost. Description of the drawings

[0012] Figure 1 is a schematic structural diagram of the present utility model;

[0013] Figure 2 is a schematic structural diagram of the internal structure of the DTRO device of the present utility model with a perspective view and partial section;

[0014] Figure 3 is a schematic sectional view of the diaphragm of the DTRO device of the present utility model;

[0015] In the figure: 1 - concentrated sodium sulfate brine buffer tank; 2 - silicon removal device; 3 - DTRO device; 4 - gas-water separator a; 5 - gas-water separator b; 6 - high-pressure air compressor; 7 - air filter; 8 - low-pressure air compressor; 9 - concentrated water buffer tank; 10 - produced water buffer tank; 11 - cylindrical shell; 12 - flow guide plate; 13 - circular hole a; 14 - circular hole b; 15 - diaphragm; 16 - air passage inlet; 17 - concentrated water passage inlet; 18 - lower nut; 19 - pull rod; 20 - upper nut; 21 - produced water outlet; 22 - concentrated water passage outlet; 23 - air passage; 24 - concentrated water passage. Detailed implementation manners Example 1

[0016] Reference Figures 1-3 In order to reduce the blockage of the membrane of the DTRO device 3, reduce the cleaning frequency and cleaning cost of the DTRO membrane, and extend the operation time of the DTRO device 3, the present utility model provides a DTRO salt separation device for sodium sulfate concentrated brine. A DTRO salt separation device for sodium sulfate concentrated brine includes a sodium sulfate concentrated brine buffer tank 1, a DTRO device 3, and a silicon removal device 2. The outlet of the sodium sulfate concentrated brine buffer tank 1 is connected to the silicon removal device 2 through a sodium sulfate concentrated brine pump and a pipeline. The concentrated brine outlet of the silicon removal device 2 is connected to the DTRO device 3 through a DTRO feed pump and a pipeline. The concentrated water outlet of the DTRO device 3 is connected to a gas-liquid separator a4 through a pipeline. The water outlet of the gas-liquid separator a4 is connected to a concentrated water buffer tank 9 through a pipeline. The water production outlet 21 of the DTRO device 3 is connected to a gas-liquid separator b5 through a pipeline. The water outlet of the gas-liquid separator b5 is connected to a water production buffer tank 10 through a pipeline. The gas outlets of the gas-liquid separator a4 and the gas-liquid separator b5 are both connected to the air compression device inlet through pipelines. The air compression device outlet is connected to the air inlet of the DTRO device 3 through a pipeline; an air filter 7 communicating with the atmosphere is also provided at the air compression device inlet.

[0017] The air compression device includes a high-pressure air compressor 6 and a low-pressure air compressor 8. The inlet of the low-pressure air compressor 8 is connected to the gas-liquid separator b5 through a pipeline, and the inlet of the low-pressure air compressor 8 is also connected to the atmosphere through an air filter 7; the outlet of the low-pressure air compressor 8 is connected to the inlet of the high-pressure air compressor 6 through a pipeline, and the inlet of the high-pressure air compressor 6 is also connected to the gas outlet of the gas-liquid separator a4 through a pipeline. The outlet of the high-pressure air compressor 6 is connected to the air inlet of the DTRO device 3 through a pipeline.

[0018] A demister b and an air buffer tank a are provided on the pipeline connecting the low-pressure air compressor 8 and the gas-liquid separator b5. An air buffer tank b is provided on the pipeline connecting the outlet of the low-pressure air compressor 8 and the inlet of the high-pressure air compressor 6. A demister a and an air buffer tank c are provided on the pipeline connecting the high-pressure air compressor 6 and the gas-liquid separator a4. An air buffer tank d is provided on the pipeline connecting the outlet of the high-pressure air compressor 6 and the air inlet of the DTRO device 3.

[0019] The pipeline connecting the concentrated brine outlet of the silicon removal device 2 and the DTRO device 3 is also communicated with a sodium hydroxide pipeline.

[0020] The DTRO device 3 includes a cylindrical shell 11 with an open column body, an upper end cover, a lower end cover, a diaphragm 15, and a flow guide plate 12. A number of flow guide plates 12 and a number of diaphragms 15 are stacked at intervals and assembled in the cylindrical shell 11 through a central pull rod 19, an upper end cover, a lower end cover, a water production outlet device, an upper nut 20, and a lower nut 18. The space surrounded by the cylindrical shell 11, the upper end cover, the lower end cover, and a number of flow guide plates 12 is an air passage 23, and the space surrounded by the flow guide plate 12, the diaphragm 15, the upper end cover, and the lower end cover is an air passage 24. Circular holes a13 are provided on the side surface of the flow guide plate 12 to connect the inner cavity of the flow guide plate 12 with the air passage 23, and a number of circular holes b14 are provided on the upper and lower discs of the flow guide plate 12 to connect the air passage 24 with the inner cavity of the flow guide plate 12, so that air enters the inner cavity of the flow guide plate 12 and enters the air passage 24 through the circular holes b14 on the flow guide plate 12; a concentrated water passage outlet 22 is provided on the upper end cover, and an air passage inlet 16 and a concentrated water passage inlet 17 are provided on the lower end cover.

[0021] The working principle of the present utility model is as follows: Since the sodium sulfate concentrated brine also contains silicon, a small amount of organic matter, and calcium and magnesium ions, the diaphragm 15 of the DTRO device 3 is blocked after running for a short time. Especially when the silicon content and organic matter content in the sodium sulfate concentrated brine are relatively high, the diaphragm 15 of the DTRO device 3 is blocked after running for two days, forcing the DTRO device 3 to stop for cleaning the diaphragm 15. Frequent membrane blockage makes it difficult for the DTRO device 3 to operate stably for a long time. The present utility model sets an air inlet on the DTRO device 3 and an air compression device, and uses the compressed air to stir the sodium sulfate concentrated brine in the DTRO device 3 to increase the turbulence effect and reduce the adhesion of silicon, organic matter, and calcium and magnesium ions on the membrane surface; at the same time, a sodium hydroxide pipeline is provided on the pipeline connecting the concentrated brine outlet of the silicon removal device 2 and the DTRO device 3, and sodium hydroxide is added to the DTRO device 3 to remove the organic matter in the DTRO device 3 and reduce the blockage of the membrane by the organic matter; the present utility model effectively reduces the blockage of the membrane of the DTRO device 3, extends the running time of the DTRO device 3, reduces the frequency of parking and cleaning of the DTRO device 3, and reduces the cleaning cost by increasing the turbulence effect in the DTRO device 3 and removing the organic matter.

[0022] Modifications and variations to the present utility model by those familiar with the present utility model fall within the scope of the patent of the present utility model, not limited to the embodiments described.

Claims

1. A DTRO salt separation device for concentrated sodium sulfate brine, characterized in that: It includes a sodium sulfate concentrated brine buffer tank, a DTRO device, and a silicon removal device. The outlet of the sodium sulfate concentrated brine buffer tank is connected to the silicon removal device through a sodium sulfate concentrated brine pump and a pipeline. The concentrated brine outlet of the silicon removal device is connected to the DTRO device through a DTRO feed pump and a pipeline. The concentrated water outlet of the DTRO device is connected to a gas-liquid separator a through a pipeline. The water outlet of the gas-liquid separator a is connected to a concentrated water buffer tank through a pipeline. The product water outlet of the DTRO device is connected to a gas-liquid separator b through a pipeline. The water outlet of the gas-liquid separator b is connected to a product water buffer tank through a pipeline; The gas outlets of the gas-liquid separator a and the gas-liquid separator b are both connected to the inlet of an air compression device through pipelines, and the outlet of the air compression device is connected to the air inlet of the DTRO device through a pipeline; An air filter communicating with the atmosphere is also provided at the inlet of the air compression device.

2. The DTRO salt separation device for concentrated sodium sulfate brine according to claim 1, wherein: The air compression device includes a high-pressure air compressor and a low-pressure air compressor. The inlet of the low-pressure air compressor is connected to the gas-liquid separator b through a pipeline, and the inlet of the low-pressure air compressor is also connected to the atmosphere through an air filter; The outlet of the low-pressure air compressor is connected to the inlet of the high-pressure air compressor through a pipeline, and the inlet of the high-pressure air compressor is also connected to the gas outlet of the gas-liquid separator a through a pipeline. The outlet of the high-pressure air compressor is connected to the air inlet of the DTRO device through a pipeline.

3. The DTRO salt separation device for concentrated sodium sulfate brine according to claim 2, wherein: A demister b and an air buffer tank a are provided on the pipeline connecting the low-pressure air compressor and the gas-liquid separator b. An air buffer tank b is provided on the pipeline connecting the outlet of the low-pressure air compressor and the inlet of the high-pressure air compressor. A demister a and an air buffer tank c are provided on the pipeline connecting the high-pressure air compressor and the gas-liquid separator a. An air buffer tank d is provided on the pipeline connecting the outlet of the high-pressure air compressor and the air inlet of the DTRO device.

4. The DTRO salt separation device for concentrated sodium sulfate brine according to claim 1, wherein: The pipeline connecting the concentrated brine outlet of the silicon removal device and the DTRO device is also connected to a sodium hydroxide pipeline.

5. The DTRO salt separation device for concentrated sodium sulfate brine according to claim 1, characterized in that: The DTRO device includes a cylindrical shell with open ends at both ends, an upper end cover, a lower end cover, a diaphragm, and a flow guide plate. A number of flow guide plates and a number of diaphragms are stacked at intervals and assembled in the cylindrical shell through a central pull rod, an upper end cover, a lower end cover, a product water outlet device, an upper nut, and a lower nut. The space enclosed by the cylindrical shell, the upper end cover, the lower end cover, and a number of flow guide plates is an air channel. The space enclosed by the flow guide plate, the diaphragm, the upper end cover, and the lower end cover is a concentrated water channel. A round hole a is provided on the side of the flow guide plate to connect the internal cavity of the flow guide plate with the air channel. A number of round holes b are provided on the upper and lower discs of the flow guide plate to connect the concentrated water channel with the internal cavity of the flow guide plate; A concentrated water channel outlet is provided on the upper end cover, and an air channel inlet and a concentrated water channel inlet are provided on the lower end cover.

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