Dielectric barrier discharge plasma device

Abstract

The application relates to the technical field of plasma, in particular to a dielectric barrier discharge plasma device which comprises a dielectric barrier body, an inner electrode body and an outer electrode body, the inner electrode body is located in the inside of the dielectric barrier body, and a gap exists between the inner electrode body and the dielectric barrier body; the outer electrode body is located on the outside of the dielectric barrier body, the outer electrode body comprises a first outer electrode layer and a second outer electrode layer; a sandwich layer is formed between the first outer electrode layer and the dielectric barrier body, and the second outer electrode layer is arranged in the sandwich layer; the dielectric barrier discharge plasma device is in the form of the double-layer outer electrode body, the problem that the outer electrode is invalid due to pollution is avoided, and the discharge stability is improved.

Description

Technical Field

[0001] This invention relates to the field of plasma technology, and in particular to a dielectric barrier discharge plasma device. Background Technology

[0002] With societal development, environmental pollution caused by human activities is becoming increasingly severe. Currently, air quality is deteriorating further, and the increasing amounts of industrial waste gas, vehicle exhaust, and various gaseous pollutants generated from home renovations and other activities are beginning to seriously threaten human health.

[0003] Currently, dielectric barrier discharge (DPD) and corona discharge (CPD) technologies are available for industrial waste gas treatment. DPD is characterized by its uniformity, diffuse dispersion, and stability. The generated plasma has a strong electromagnetic field, and the active particles within the plasma have high energy, making it safer and having a longer electrode lifespan compared to other plasma forms. However, current DPD plasma devices use linear ionization, which prevents pollutants from fully contacting the plasma in the discharge zone, resulting in low purification efficiency. Furthermore, because the waste gas contacts the external electrode, pollutants easily adhere and accumulate on it, causing the electrode to fail due to contamination and necessitating regular replacement or cleaning. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a dielectric barrier discharge plasma device that, by setting up a double-layered external electrode body, avoids the problem of external electrode failure due to contamination and improves discharge stability.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this application provides a dielectric barrier discharge plasma device, including a dielectric barrier body, an inner electrode body, and an outer electrode body. The inner electrode body is located inside the dielectric barrier body, and there is a gap between the inner electrode body and the dielectric barrier body. The outer electrode body is located outside the dielectric barrier body, and the outer electrode body includes a first outer electrode layer and a second outer electrode layer. An interlayer is formed between the first outer electrode layer and the dielectric barrier body, and the second outer electrode layer is disposed within the interlayer.

[0008] Preferably, the second outer electrode layer is a stainless steel powder filling layer.

[0009] Preferably, the dielectric barrier is a cylindrical structure, with an air inlet at one end and an air outlet at the other end; the inner electrode is connected to a first conductor at the end near the air inlet and a second conductor at the end near the air outlet.

[0010] Preferably, a primary filter module is provided inside the media barrier body and at the end of the inner electrode body near the air inlet.

[0011] Preferably, the primary filtration module includes a guide tube, a filter box, a first filter layer, and a second filter layer; the guide tube is made of insulating material and is sleeved on the outside of the first conductor; the filter box has a mounting hole in the middle and is sleeved on the outside of the guide tube through the mounting hole; an annular mounting cavity is formed on the inner side of the filter box, and grid plates are formed on the two sides of the filter box perpendicular to the first conductor; both the first filter layer and the second filter layer are disposed in the mounting cavity, and the pore size of the first filter layer is larger than that of the second filter layer; the first filter layer is located at the end near the air inlet, and the second filter layer is located at the end away from the air inlet.

[0012] Preferably, a sealing strip is provided at intervals on the outer wall of the filter box. The sealing strip is made of rubber and abuts against the inner wall of the medium barrier.

[0013] Preferably, a flow guide plate is provided inside the medium barrier body. The flow guide plate is funnel-shaped and has a connecting hole in the middle. The flow guide plate is located between the filter box and the inner electrode body. The end of the flow guide plate with a smaller cross-sectional area is close to the filter box and is connected to the guide tube through the connecting hole. The end of the flow guide plate with a larger cross-sectional area is close to the inner electrode body. The maximum diameter of the cross-sectional area of ​​the flow guide plate is less than or equal to the outer diameter of the inner electrode body.

[0014] Preferably, both ends of the medium barrier are detachably connected to connectors, each connector including a main pipe and a branch connector; one end of the main pipe is connected to the air inlet or outlet, and the other end forms an opening; the branch connector is connected to one side of the main pipe for connecting to a power source; a partition is integrally formed on the inner side of the main pipe, and a connecting terminal is integrally formed on the side of the partition near the medium barrier; the connecting terminal is in contact with a first conductor or a second conductor, and the branch connector and the connecting terminal are electrically connected; multiple communication ports are provided on the partition and located outside the connecting terminal.

[0015] (III) Beneficial Effects

[0016] This invention provides a dielectric barrier discharge plasma device. By incorporating a sandwich layer within a first external electrode layer and adding a second external electrode layer within that sandwich layer, the outer side of the second external electrode layer is protected by the first external electrode layer, preventing contamination and improving the overall lifespan of the external electrode body, as well as extending the maintenance cycle. Simultaneously, plasma exhibits a memory effect; residual charge on the surface of the dielectric barrier can affect the uniformity of subsequent discharges and reduce efficiency. The stainless steel powder filling layer, composed of multiple integrated solid particles, allows for particle displacement during equipment vibration, resolving the residual charge issue. The dielectric barrier limits current growth, prevents arc formation, and ensures stable and controllable discharge. The air inclusions within the stainless steel powder filling layer also suppress arc formation, contributing to equipment stability. Currently, DBD technology suffers from uneven discharge due to electrode uniformity issues, affecting discharge efficiency. Adding a stainless steel powder layer indirectly smooths the external electrode, resulting in more uniform discharge.

[0017] Secondly, this application incorporates a primary filter module within the dielectric barrier body, near the air inlet. This module provides initial filtration of contaminants entering the dielectric barrier body, preventing debris from entering the gap between the inner electrode and the dielectric barrier. Simultaneously, the filter box, connected to the first conductor, limits the position of the inner electrode, ensuring its stability. During equipment vibration, the gap between the inner electrode and the dielectric barrier remains stable, resulting in a smoother inner electrode and improved uniformity of subsequent discharge. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the first embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the structure of the second embodiment of the present invention;

[0020] Figure 3 To highlight the present invention Figure 2 Enlarged view of the A-structure in the middle;

[0021] Figure 4 This is a cross-sectional view highlighting the filter cartridge of the present invention;

[0022] Figure 5 This is a cross-sectional view highlighting the connector of the present invention.

[0023] Marked in the attached diagram:

[0024] 100. Medium barrier; 110. Air inlet; 120. Air outlet; 200. Inner electrode; 210. First conductor; 220. Second conductor; 300. Outer electrode; 310. First outer electrode layer; 311. Interlayer; 320. Second outer electrode layer; 400. Primary filter module; 410. Guide tube; 420. Filter box; 421. Mounting hole; 422. Mounting cavity; 423. Grille; 430. First filter layer; 440. Second filter layer; 450. Sealing strip; 500. Flow deflector; 510. Connection hole; 600. Connector; 610. Main pipe; 611. Partition; 612. Connection terminal; 613. Connecting port; 620. Support joint. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] First Embodiment

[0027] This invention provides a dielectric barrier discharge plasma device, see [link to related document]. Figure 1 It includes a dielectric barrier 100, an inner electrode 200, and an outer electrode 300. The dielectric barrier 100 is a cylindrical structure with an air inlet 110 at one end and an air outlet 120 at the other end. Specifically, the dielectric barrier 100 can be made of quartz glass tube.

[0028] The inner electrode 200 is a cylindrical structure disposed inside the dielectric barrier 100, with a gap between the inner electrode 200 and the dielectric barrier 100. This gap generates plasma during operation. The outer electrode 300 is located outside the dielectric barrier 100, corresponding to the position of the inner electrode 200. During operation, power is applied to both the outer electrode 300 and the inner electrode 200, thereby generating plasma within the gap between them.

[0029] Specifically, the external electrode body 300 includes a first external electrode layer 310 and a second external electrode layer 320; the first external electrode layer 310 and the dielectric barrier 100 are fixedly connected, and an interlayer 311 is formed between them, with the second external electrode layer 320 disposed within the interlayer 311. The first external electrode is a stainless steel sleeve, and the second external electrode layer 320 is a stainless steel powder filling layer. A double-layer external electrode is formed by the stainless steel sleeve and the stainless steel powder filling layer.

[0030] If the first external electrode layer 310 is set up alone, pollutants will be adsorbed on the first external electrode layer 310 due to contact with exhaust gas during operation. The first external electrode layer 310 may fail due to the contaminant covering. Therefore, the first external electrode layer 310 needs to be replaced or cleaned regularly.

[0031] This application provides an interlayer 311 within the first external electrode layer 310, and adds a second external electrode layer 320 within the interlayer 311. The outer side of the second external electrode layer 320 is protected by the first external electrode layer 310, preventing contamination. This improves the overall service life of the external electrode body 300 and extends the maintenance cycle.

[0032] Meanwhile, plasma has a memory effect. Due to the residual charge on the surface of the dielectric barrier 100, it will affect the uniformity of subsequent discharge and affect efficiency. The stainless steel powder filling layer is composed of multiple solid particles. During use, when the equipment vibrates, the particles inside the powder will shift, thus solving the problem of residual charge.

[0033] The dielectric barrier 100 serves to limit current growth, prevent arc formation, and ensure stable and controllable discharge. The air inclusions within the stainless steel powder filler layer also inhibit arc formation, thus stabilizing the equipment. Currently, DBD technology suffers from uneven discharge due to electrode uniformity issues, affecting discharge efficiency. Adding a stainless steel powder layer indirectly makes the external electrode smoother, resulting in more uniform discharge.

[0034] The inner electrode 200 is connected to a first conductor 210 at one end near the air inlet 110 and to a second conductor 220 at the other end near the air outlet 120. A power supply is connected through the first conductor 210 and the second conductor 220.

[0035] Second Embodiment

[0036] See Figures 2-4 The difference between this embodiment and the first embodiment is that a primary filter module 400 is provided inside the medium barrier 100 and at the end of the inner electrode 200 near the air inlet 110.

[0037] Specifically, the primary filtration module 400 includes a guide tube 410, a filter box 420, a first filter layer 430, and a second filter layer 440. The guide tube 410 is made of insulating material and is sleeved on the outside of the first conductor 210. The filter box 420 has a mounting hole 421 in the middle and is sleeved on the outside of the guide tube 410 through the mounting hole 421. An annular mounting cavity 422 is formed on the inner side of the filter box 420, and grid plates 423 are formed on the two sides of the filter box 420 perpendicular to the first conductor 210; multiple holes are formed on the grid plates 423 at intervals and are connected to the mounting cavity 422 through the holes.

[0038] Both the first filter layer 430 and the second filter layer 440 are disposed within the mounting cavity 422. The pore size of the first filter layer 430 is larger than that of the second filter layer 440. The first filter layer 430 is located at the end near the air inlet 110, while the second filter layer 440 is located at the end away from the air inlet 110. That is, when a pollution source passes through the interior of the media barrier 100, it preferentially passes through the first filter layer 430, and then through the second filter layer 440. Through the primary filtration module 400, the pollution source entering the media barrier 100 can be initially filtered, preventing debris from entering the gap between the inner electrode body 200 and the media barrier 100. At the same time, the filter box 420 is connected to the first conductor 210, thereby limiting the inner electrode body 200 and keeping it in a stable position. When the equipment vibrates, the gap between the inner electrode body 200 and the media barrier 100 can remain stable, which to a certain extent makes the inner electrode smoother and improves the uniformity of subsequent discharge.

[0039] In one embodiment, sealing strips 450 are spaced apart on the outer wall of the filter box 420. The sealing strips 450 are made of rubber and abut against the inner wall of the media barrier 100. The sealing strips 450 provide a sealing effect to a certain extent, allowing all pollutants entering the media barrier 100 to undergo preliminary filtration through the first filter layer 430 and the second filter layer 440.

[0040] In one embodiment, a flow guide plate 500 is provided inside the dielectric barrier 100. The flow guide plate 500 is funnel-shaped and has a connecting hole 510 in its middle. The flow guide plate 500 is located between the filter box 420 and the inner electrode body 200. The end of the flow guide plate 500 with a smaller cross-sectional area is close to the filter box 420 and is connected to the guide tube 410 through the connecting hole 510. The end of the flow guide plate 500 with a larger cross-sectional area is close to the inner electrode body 200. The maximum diameter of the cross-sectional area of ​​the flow guide plate 500 is less than or equal to the outer diameter of the inner electrode body 200. Through the flow guide plate 500, after the pollutant source passes through the filter box 420, the flow guide plate 500 can guide the pollutant source, allowing it to quickly enter the gap between the inner electrode body 200 and the dielectric barrier 100. Before entering the gap, the flow guide plate 500 rectifies the flow, increasing the flow rate, improving the purification efficiency, and enhancing the uniformity of the discharge.

[0041] In one embodiment, both ends of the medium barrier 100 are detachably connected to connectors 600, and connectors 600 include a main pipe 610 and a branch connector 620.

[0042] One end of the main pipe 610 is connected to the air inlet 110 or the air outlet 120, and the other end forms an opening. The branch connector 620 is connected to one side of the main pipe 610 for connecting to the power supply. A partition 611 is integrally formed inside the main pipe 610. A connecting terminal 612 is integrally formed on one side of the partition 611 near the medium barrier 100. The connecting terminal 612 is electrically connected to the first conductor 210 or the second conductor 220. The branch connector 620 is electrically connected to the connecting terminal 612. Multiple communication ports 613 are opened on the partition 611 and outside the connecting terminal 612.

[0043] The connector 600 and the baffle 500 can limit the movement of the intermediate filter box 420 to a certain extent, ensuring the overall stability of the device after installation. This also facilitates the replacement of the filter box 420 after a period of operation.

[0044] This invention provides a dielectric barrier discharge plasma device. By setting an interlayer 311 within the first outer electrode layer 310, and adding a second outer electrode layer 320 within the interlayer 311, the outer side of the second outer electrode layer 320 is protected by the first outer electrode layer 310, preventing contamination and improving the overall service life of the outer electrode body 300, as well as extending the maintenance cycle. Simultaneously, plasma exhibits a memory effect; residual charge on the surface of the dielectric barrier body 100 can affect the uniformity of subsequent discharge and reduce efficiency. The stainless steel powder filling layer, composed of multiple solid particles, allows for particle displacement during equipment vibration, resolving the residual charge issue. The dielectric barrier body 100 limits current growth, prevents arc formation, and ensures stable and controllable discharge. The air inclusions within the stainless steel powder filling layer also suppress arc formation, stabilizing the equipment. Currently, DBD technology suffers from uneven discharge due to electrode uniformity issues, affecting discharge efficiency. Adding a stainless steel powder layer indirectly makes the outer electrode smoother, resulting in more uniform discharge.

[0045] Secondly, this application includes a primary filter module 400 located within the dielectric barrier 100 and near the air inlet 110. This module provides initial filtration of contaminants entering the dielectric barrier 100, preventing debris from entering the gap between the inner electrode 200 and the dielectric barrier 100. Simultaneously, the filter box 420, connected to the first conductor 210, limits the position of the inner electrode 200, ensuring its stability. During equipment vibration, the gap between the inner electrode 200 and the dielectric barrier 100 remains stable, resulting in a smoother inner electrode and improved uniformity of subsequent discharge.

[0046] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0047] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Without conflict, the embodiments and features in the embodiments of this invention can be combined with each other.

[0048] The embodiments described above are merely illustrative of implementation methods of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A dielectric barrier discharge plasma device, characterized in that: It includes a dielectric barrier (100), an inner electrode (200) and an outer electrode (300), wherein the inner electrode (200) is located inside the dielectric barrier (100) and there is a gap between the inner electrode (200) and the dielectric barrier (100); The external electrode body (300) is located outside the dielectric barrier (100), and the external electrode body (300) includes a first external electrode layer (310) and a second external electrode layer (320); an interlayer (311) is formed between the first external electrode layer (310) and the dielectric barrier (100), and the second external electrode layer (320) is disposed in the interlayer (311). The dielectric barrier (100) has a cylindrical structure, with an air inlet (110) formed at one end and an air outlet (120) formed at the other end; the inner electrode (200) is connected to a first conductor (210) at one end near the air inlet (110) and to a second conductor (220) at one end near the air outlet (120). A primary filter module (400) is provided inside the medium barrier (100) and at the end of the inner electrode body (200) near the air inlet (110). The primary filtration module (400) includes a guide tube (410), a filter box (420), a first filter layer (430), and a second filter layer (440). The guide tube (410) is made of insulating material and is sleeved on the outside of the first conductor (210); The filter box (420) has a mounting hole (421) in the middle and is sleeved on the outside of the guide tube (410) through the mounting hole (421); the filter box (420) has an annular mounting cavity (422) on the inner side; and the filter box (420) has a grid plate (423) on both sides perpendicular to the first conductor (210). The first filter layer (430) and the second filter layer (440) are both disposed in the mounting cavity (422). The first filter layer (430) has larger pores than the second filter layer (440). The first filter layer (430) is located at the end near the air inlet (110), and the second filter layer (440) is located at the end away from the air inlet (110).

2. The dielectric barrier discharge plasma device according to claim 1, characterized in that: The second external electrode layer (320) is a stainless steel powder filling layer.

3. The dielectric barrier discharge plasma device according to claim 1, characterized in that: A sealing strip (450) is provided at intervals on the outer wall of the filter box (420). The sealing strip (450) is made of rubber material and abuts against the inner wall of the medium barrier (100).

4. The dielectric barrier discharge plasma device according to claim 1, characterized in that: A flow guide plate (500) is provided inside the medium block (100). The flow guide plate (500) is funnel-shaped and has a connecting hole (510) in the middle. The flow guide plate (500) is located between the filter box (420) and the inner electrode body (200). The end of the flow guide plate (500) with a smaller cross-sectional area is close to the filter box (420) and is connected to the guide tube (410) through the connecting hole (510). The end of the flow guide plate (500) with a larger cross-sectional area is close to the inner electrode body (200). The maximum diameter of the cross-sectional area of ​​the flow guide plate (500) is less than or equal to the outer diameter of the inner electrode body (200).

5. The dielectric barrier discharge plasma device according to claim 1, characterized in that: Both ends of the medium barrier (100) are detachably connected to connectors (600), and the connectors (600) include a main pipe (610) and a branch connector (620). One end of the main pipe (610) is connected to the air inlet (110) or the air outlet (120), and the other end forms an opening. The branch connector (620) is connected to one side of the main pipe (610) for connecting to the power supply. The main pipe (610) has an integrally formed baffle (611) on its inner side. The baffle (611) has an integrally formed connecting terminal (612) on one side near the medium barrier (100). The connecting terminal (612) is in contact with the first conductor (210) or the second conductor (220). The branch joint (620) and the connecting terminal (612) are electrically connected. The partition (611) has a plurality of communication ports (613) on the outside of the connection terminal (612).

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