A DBD plasma treatment device for seawater desalination

Abstract

A DBD plasma treatment device for seawater desalination, with an outer dielectric tube wound with a copper mesh, the copper mesh being connected to a power supply, and a metal rod being provided inside the inner dielectric tube as a grounding electrode. One end of the metal rod is connected to a sealing cover, and a water inlet hole is provided on the sealing cover. The seawater inside the inner dielectric tube enters the discharge area through the water inlet hole of the sealing cover on the dielectric tube. The outer dielectric tube and the inner dielectric tube are connected at the bottom and connected to a base. A water inlet pipe is provided at the bottom of the base and connected to a first water inlet, and the water inlet pipe is connected to a water pump. The base is connected to a chassis, and multiple second water outlet holes are opened on the base above the second water tank. Compared with the existing plasma method for treating seawater devices, the falling film of seawater in the reactor is more uniform, and the treatment effect is better; the process is simple and stable, reducing the cost of seawater desalination, and the requirements for the device materials are relatively low. This device operates stably and can adjust the operation mode according to different needs. This device has a wide range of applications and can also be used in other complex fields such as wastewater treatment.

Description

Technical Field

[0001] The present invention belongs to the field of seawater desalination and relates to a DBD plasma treatment device for seawater desalination. Background Art

[0002] At present, the main methods of seawater desalination include reverse osmosis (RO) and thermal-driven methods. The thermal-driven methods are divided into multi-stage flash distillation (MFD), multi-effect distillation (MED), and vapor compression distillation (VCD). For the reverse osmosis method (RO), although the effect is good, there are disadvantages such as membrane fouling, which requires frequent cleaning and replacement of the membrane, and high capital costs. For the thermal-driven methods, although the conversion efficiency has been improved, there are problems such as complex processes, high equipment costs, and poor economy.

[0003] In the fields of sewage treatment and seawater desalination, plasma has been used as an efficient and effective tool for water desalination and purification due to its unique properties and has received much attention in recent years. At the same time, the use of some current plasmas for water purification is a technology widely applied in industrial and medical fields.

[0004] For some conventional plasma reactors of current plasma water purification devices, there are some defects: 1) The liquid falling film formed in the reactor is uneven, with too much liquid in some areas and too little liquid in some areas, so the treatment effect is poor. 2) When using the reactor for water treatment, various salts will precipitate on the surface of the medium tube, so it needs to be disassembled and cleaned in time. 3) The conventional reactor device is limited by the reactor size, and the purification rate is not high. A lot of liquid flows out of the reactor before it can be treated. 4) Some reactors consume a large amount of energy when performing seawater desalination. Summary of the Invention

[0005] 1. Technical problems to be solved:

[0006] Solve the defects existing in some conventional plasma reactors of current plasma water purification devices: uneven liquid falling film, difficult to disassemble and clean, limited reactor size, low purification rate, and large energy consumption when performing seawater desalination.

[0007] 2. Technical solutions:

[0008] To solve the above problems, the present invention provides a DBD plasma treatment device for seawater desalination, including a seawater desalination device. The seawater desalination device includes an outer medium tube, an inner medium tube, and a first water tank located below. The outer medium tube is wound with a copper mesh, and the copper mesh is connected to a power supply through a high-voltage electrode interface. A metal rod is provided inside the inner medium tube as a grounding electrode. The space between the outer medium tube and the inner medium tube is a discharge area. One end of the metal rod is connected to a capping cover, and the capping cover is provided with a water inlet hole. The seawater inside the inner medium tube can enter the discharge area through the water inlet hole. The bottoms of the outer medium tube and the inner medium tube are connected and then connected to a base. The bottom of the base is provided with a water inlet pipe connected to a first water inlet. The water inlet pipe is connected to a water pump arranged in the first water tank. Driven by the water pump, water enters the inner medium tube through the water inlet pipe and the first water inlet. The base is connected to a chassis located below. The chassis is provided with a card slot matching the buckle. There is also a second water tank. A plurality of second water outlet holes are opened in the base above the second water tank. The water in the discharge area flows into the second water tank and then flows into the first water tank through a first water outlet.

[0009] Further, a buckle is provided below the surface of the base. The chassis is provided with a card slot matching the buckle. There is also a second water tank. The water in the discharge area flows into the second water tank and then flows into the first water tank through a first water outlet.

[0010] Further, a fixing bolt is included. The fixing bolt is inserted into the card slot to prevent the outer medium tube from rotating.

[0011] Further, the top end of the capping cover has a plurality of air vent holes for balancing the air pressure difference inside and outside the reactor. The lower half of the capping cover is closely attached to the inner wall of the inner medium tube. A plurality of tangential water inlet holes are evenly distributed around the capping cover. A sealing rubber ring is provided at the bottom of the capping cover.

[0012] Further, the seawater desalination device is arranged in a glass outer cover. A glass support is fixed inside the glass outer cover. The glass support is provided with a ring having the same outer diameter as the outer medium tube. The ring sleeves the outer medium tube for supporting the outer medium tube.

[0013] Further, the energy of the power supply comes from new energy, and the new energy is one or a combination of wind energy and solar energy.

[0014] Further, a plurality of seawater desalination devices can work in series. The water in the first water tank enters the inner medium tube on one side through the first water inlet, moves upward under the action of the water pump, flows into the discharge area on the adjacent side through the tangential water inlet hole, flows out from the first water outlet on one side after being treated, and then enters the inner medium tube on the next adjacent side under the action of the water pump, and so on, realizing the series operation of multiple systems.

[0015] Furthermore, multiple seawater desalination devices can operate in parallel. The water in the first water tank enters the corresponding inner medium pipes simultaneously through the corresponding first water inlets, moves upward under the action of the water pump, flows into their respective discharge areas from the corresponding tangential water inlets, and flows out from the corresponding first water outlets after being treated, realizing the parallel operation of multiple systems.

[0016] Furthermore, on one side of the first water tank, there is a third water inlet, and on the other side, there is a third water outlet.

[0017] Furthermore, the materials of the outer medium pipe and the inner medium pipe are both quartz.

[0018] 3. Beneficial effects:

[0019] Compared with the existing seawater treatment device using the plasma method, the present invention adds a tangential water inlet, making the falling film of seawater in the reactor more uniform and achieving better treatment effects; the use of the plasma device simplifies the treatment process and makes it stable, reducing the cost of seawater desalination and having lower requirements for the material of the device. This device operates stably and can adjust the operation mode according to different needs. This device has a wide range of applications, mainly used for seawater desalination but not limited to the field of seawater desalination, and can also be used in other complex fields such as wastewater treatment. Description of the Drawings

[0020] Figure 1 It is a schematic diagram of the DBD plasma device system for seawater desalination.

[0021] Figure 2 It is a cross-sectional schematic diagram of the DBD plasma device for seawater desalination.

[0022] Figure 3 It is a schematic diagram of the DBD plasma device for seawater desalination.

[0023] Figure 4 It is a schematic diagram of the sealing cover.

[0024] Figure 5 It is a schematic diagram of the medium pipe base.

[0025] Figure 6 It is a schematic diagram of the chassis.

[0026] Figure 7 It is a schematic diagram of the device in series.

[0027] Figure 8 It is a schematic diagram of the device in parallel.

[0028] Figure 9 It is a schematic diagram of the first water tank.

[0029] Description of the reference numerals: 1. New energy; 2. Power supply; 3. Water pump; 4. Seawater desalination device; 401. Glass outer cover; 402. Device bracket; 403. Capping cover; 404. Ground electrode; 405. Outer medium pipe; 406. Inner medium pipe; 407. Copper mesh; 408. Fixed bolt; 409. High-voltage electrode interface; 410. Chassis; 411. Base; 412. First water inlet; 413. First water outlet; 415. First water tank; 416. Vent hole; 417. Water inlet hole; 418. Sealing rubber ring; 419. Water inlet pipe; 420. Buckle; 421. Second water outlet; 422. Second water tank; 423. Card slot; 424. Groove; 425. Third water inlet; 426. Third water outlet. Detailed implementation manners

[0030] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0031] As Figure 1 shown, a DBD plasma treatment device for seawater desalination includes a seawater desalination device 4. A water pump 3 is provided inside the seawater desalination device 4, and a power supply provides power for the seawater desalination device 4 and the water pump 3.

[0032] As Figure 2 and Figure 3 shown, the present invention provides a DBD plasma treatment device for seawater desalination, including a seawater desalination device 4. The seawater desalination device includes an outer medium pipe 405, an inner medium pipe 406, and a first water tank 415 located below. The outer medium pipe 5 is wound with a copper mesh 407. The copper mesh 407 is connected to a high-voltage power supply through a high-voltage electrode interface 409. A metal rod is provided inside the inner medium pipe 6 as a ground electrode 404. The discharge area is between the outer medium pipe 405 and the inner medium pipe 406.

[0033] In one embodiment, the materials of the outer medium pipe 405 and the inner medium pipe 406 are both quartz. The outer diameter of the outer medium pipe is 23 - 29 cm, the inner diameter is 25 - 28 cm, and the height is 87 - 107 cm; the outer diameter of the inner medium pipe is 18 - 20 cm, the inner diameter is 17 - 19 cm, and the height is 78 - 94 cm

[0034] One end of the metal rod is connected to the capping cover 403. The capping cover 403 is provided with a water inlet hole 417. The seawater inside the inner medium pipe 406 can enter the discharge area from the water inlet hole 417.

[0035] In one embodiment, the length of the metal rod electrode is 84 cm, and the diameter is 0.9 - 1.1 cm.

[0036] In one embodiment, as Figure 5As shown, the bottom of the outer medium pipe 405 and the inner medium pipe 406 are connected and connected to the base 411. The bottom of the base 411 is provided with a water inlet pipe 419 connected to the first water inlet 412. The water inlet pipe 419 is connected to the water pump 3 provided in the first water tank 415.

[0037] The water pump 3 pumps the water in the first water tank 415 into the inner medium pipe 406 through the first water inlet 413. Under the action of the water pump 2, the water in the inner medium pipe 406 enters the discharge area through the water inlet hole 417 of the capping cover 403 for seawater desalination. The desalinated water returns to the first water tank through the first water outlet 413.

[0038] In order to make the outer medium pipe 405 and the inner medium pipe 406 stable during operation, and at the same time, after seawater desalination, salt usually precipitates on the surfaces of the outer medium pipe 405, the inner medium pipe 406, and the grounding electrode 404, which needs to be cleaned in time, otherwise it will affect the subsequent treatment effect. Therefore, the DBD reactor should be convenient to install and disassemble.

[0039] In one embodiment, the base 411 is connected to the chassis 410 provided below. As Figure 6 shown, the chassis 410 is provided with a card slot 423 matching the buckle 420, and is also provided with a second water tank 422. A plurality of second water outlets 421 are opened in the base 411 above the second water tank 422. The desalinated water flow in the discharge area enters the second water tank 422 through the second water outlets 421, and then flows into the first water tank 415 through the first water outlet 413.

[0040] Since there may sometimes be a gap between the card slot 423 and the buckle, in one embodiment, the fixing bolt 408 is inserted into the card slot 423 to prevent the reactor from rotating. The specific method is as follows: After placing the base 411 into the chassis 410, rotate it by a certain angle, and then insert the fixing bolt 408 into the card slot 423.

[0041] When disassembly is required, pull out the fixing bolt 408, rotate the base 411, and the buckle 420 is separated from the card slot 423, making disassembly very convenient.

[0042] In one embodiment, the outer radius of the base 411 is 13.5 cm, the length of the buckle 420 on the base is 2.5 cm, which plays a role in fixing the reactor; the radius of the water inlet pipe 419 at the center of the base is 1.5 cm, which is used to connect the water pipe on the water pump 3, and the radius of the second water outlets 421 around is 1 cm. The overall chassis is a cuboid with length, width, and height of 60 cm, 60 cm, and 10 cm respectively.

[0043] In one embodiment, as Figure 4As shown, the capping cover 403 is made of polytetrafluoroethylene material. There are four vent holes 416 at the top of the capping cover 403 to balance the air pressure difference inside and outside the reactor. The outer diameter of the upper half of the capping cover is 18 - 22 cm, and the height is 9 - 11 cm. The outer diameter of the lower half is 17 - 21 cm, and the height is 4.5 - 5.5 cm. The lower half fits tightly against the inner wall of the medium pipe. There are eight tangential water inlet holes 417 around the capping cover, with a pore diameter of 0.45 - 0.55 cm. The tangential water inlet holes 417 make the water film formed on the outer side of the inner wall of the medium more uniform, thus making the effect of seawater desalination better. The bottom is a sealing rubber ring 418 to enhance the airtightness of the device.

[0044] The said tangential guide holes 417 make the liquid falling film of the device more uniform, and the mortise and tenon structure makes the installation and disassembly of the device more convenient; and a reactor base is designed, making the device easier to cascade and increasing the liquid treatment time. The installation and disassembly are more convenient; and a reactor base is designed, making the device easier to cascade and increasing the liquid treatment time.

[0045] In one embodiment, new energy sources such as solar energy / wind energy 1 are used as the energy source for the device to discharge electricity. New energy sources such as solar energy and wind energy are adopted to supply energy to the reactor, reducing carbon emissions and making the reactor more environmentally friendly when performing seawater desalination.

[0046] The present invention has two operating modes. The design of the base 411 can achieve the series or parallel operation of two DBD reactors. When operating in series, the residence time of seawater in the reactor can be greatly increased, enhancing the desalination efficiency of the reactor. When operating in parallel, the total amount of seawater treated per unit time can be increased.

[0047] In one embodiment, series mode: As Figure 7 shown, the water in the first water tank 415 enters the corresponding inner medium pipe 406 simultaneously through the corresponding first water inlet 412, moves upward under the action of the water pump 3, flows into their respective discharge areas from the corresponding tangential water inlet holes 417, and flows out from the corresponding first water outlet 413 after being treated, realizing the parallel operation of multiple systems.

[0048] In one embodiment, parallel mode: As Figure 8 shown, the water in the first water tank 415 enters the corresponding inner medium pipe 406 simultaneously through the corresponding first water inlet 412, moves upward under the action of the water pump 3, flows into their respective discharge areas from the corresponding tangential water inlet holes 417, and flows out from the corresponding first water outlet 413 after being treated, realizing the parallel operation of multiple systems.

[0049] In one embodiment, the first water tank 415 is 65 - 75 cm long, 32 - 38 cm wide, and 32 - 38 cm high. Grooves 424 are provided at the corners for placing the DBD reactor device. The third water inlet 425 and the third water outlet 426 are arranged on both sides of the water tank, which can make the water inlet and outlet of the first water tank 415 more convenient. During operation, we will block the third water inlet 425 and the third water outlet 426 to prevent water leakage during operation.

Claims

1. A DBD plasma treatment device for seawater desalination, comprising a seawater desalination device (4), characterized in that: The seawater desalination device comprises an outer medium tube (405), an inner medium tube (406) and a first water tank (415) located below; the outer medium tube (405) is wound with a copper mesh (407); the copper mesh (407) is connected to a power source via a high-voltage electrode interface (409); a metal rod is provided in the inner medium tube (406) as a grounding electrode (404); a discharge area is formed between the outer medium tube (405) and the inner medium tube (406); one end of the metal rod is connected to a capping cover (403); The capping cover (403) is provided with a water inlet hole (417), and seawater in the inner medium tube (406) can enter the discharge area through the water inlet hole (417). The outer medium tube (405) and the inner medium tube (406) are connected at the bottom and connected to the base (411). The base (411) is provided with a water inlet pipe (419) at the bottom and connected to the first water inlet (412). The water inlet pipe (419) is connected to a water pump (3) provided in the first water tank (415). Water is discharged from the water pump (3 ) is driven by the water inlet pipe (419) and the first water inlet (412) to enter the inner medium pipe (406); the base (411) is connected to the bottom chassis (410) below; a buckle (420) is provided below the surface of the base (411); a slot (423) matching the buckle (420) is provided on the bottom chassis (410); a second water trough (422) is also provided; and a plurality of second water outlets (421) are provided on the base (411) above the second water trough (422). The water in the discharge area flows into the second water tank (422), and flows into the first water tank (415) through the first water outlet (413). The top of the capping cover (403) is provided with a plurality of air holes (416) for balancing the pressure difference between the inside and outside of the reactor. The lower part of the capping cover (403) is tightly fitted with the inner wall of the inner medium tube (406). A plurality of tangential water inlet holes (417) are evenly distributed around the capping cover (403). A sealing rubber ring (418) is provided at the bottom of the capping cover (403).

2. The DBD plasma treatment device for seawater desalination according to claim 1, characterized in that: It also includes a fixing bolt (408), wherein the fixing bolt (408) is inserted into the clamping slot (423) to prevent the external medium tube (405) from rotating.

3. The DBD plasma treatment device for seawater desalination according to claim 1, characterized in that: The seawater desalination device (4) is arranged in a glass outer cover (401), a glass support (402) is fixed in the glass outer cover (401), a circular ring having the same outer diameter as the external medium tube (405) is provided on the glass support (402), and the circular ring covers the external medium tube (405) and is used to support the external medium tube (405).

4. The DBD plasma treatment device for seawater desalination according to any one of claims 1 to 3, characterized in that: The energy of the power source (2) comes from the new energy (1), and the new energy (1) is one of wind energy and solar energy, or a combination of the two.

5. The DBD plasma treatment device for seawater desalination according to any one of claims 1 to 3, characterized in that: The plurality of seawater desalination devices (4) can operate in series. Water in the first water tank (415) enters the inner medium pipe (406) on one side through the first water inlet (412), moves upward under the action of the water pump (3), flows into the discharge area on the adjacent side from the tangential water inlet hole (417), flows out from the first water outlet (413) on one side after being processed, and enters the inner medium pipe (406) on the next adjacent side under the action of the water pump (3), and so on, thereby realizing the series operation of the plurality of systems.

6. The DBD plasma treatment device for seawater desalination according to any one of claims 1 to 3, characterized in that: The plurality of seawater desalination devices (4) can operate in parallel, and the water in the first water tank (415) simultaneously enters the corresponding inner medium pipe (406) through the corresponding first water inlet (412), moves upward under the action of the water pump (3), flows into the respective discharge areas from the corresponding tangential water inlet hole (417), and flows out from the corresponding first water outlet (413) after being processed, thereby realizing the parallel operation of the plurality of systems.

7. The DBD plasma treatment device for seawater desalination according to any one of claims 1 to 3, characterized in that: The first water tank (415) is provided with a third water inlet (425) on one side and a third water outlet (426) on the other side.

8. The DBD plasma treatment device for seawater desalination according to any one of claims 1 to 3, characterized in that: The outer medium tube (405) and the inner medium tube (406) are both made of quartz.

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