CN111470587B - Bubble-film dielectric barrier discharge plasma pollutant treatment device - Google Patents
Bubble-film dielectric barrier discharge plasma pollutant treatment device Download PDFInfo
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- CN111470587B CN111470587B CN201911314405.1A CN201911314405A CN111470587B CN 111470587 B CN111470587 B CN 111470587B CN 201911314405 A CN201911314405 A CN 201911314405A CN 111470587 B CN111470587 B CN 111470587B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/4608—Treatment of water, waste water, or sewage by electrochemical methods using electrical discharges
Abstract
The invention discloses a bubble film type dielectric barrier discharge plasma pollutant treatment device, which is characterized in that: the method comprises two discharge forms of surface dielectric barrier discharge and streamer discharge; the water inlet pipe and the water outlet pipe of the device are arranged below the inner pipe 1; the discharge assembly comprises a high-voltage electrode, an insulating medium and an aeration disc (a micro-channel element); the earth pole of the device is arranged on the wall surface of the outer tube 2 and distributed spirally, so that the electrode is tightly attached to the wall surface of the tube; the insulating medium is arranged on the high-voltage pole and serves as an outer layer of the high-voltage pole; the aeration disc is positioned below the inner pipe 1, the upper position and the lower position are fixed through the two small circular rings (1-4) and (1-5), gas enters the inner pipe through the aeration disc under certain pressure, and a water film is formed under the condition of water passing, so that discharging is started; the device is divided into an upper part and a lower part by flanges (2-4). The invention can realize self-cooling during discharging and can treat the organic pollutants difficult to degrade with low cost, high efficiency and high mass transfer.
Description
Technical Field
The invention belongs to the technical field of pollutant treatment, and particularly relates to a bubble-film type dielectric barrier discharge plasma pollutant treatment device.
Background
With the development of industries such as petrochemical industry, organic synthesis, printing and dyeing and the like, various high-concentration refractory organic wastewater and waste gas are increased correspondingly, and more problems are brought to environmental protection. The treatment of refractory organic pollutants has been a difficult point and a key point in environmental protection. The organic matter which is difficult to degrade refers to a compound which can not be degraded by organisms or can not be degraded in any environment at a high enough speed so that the organic matter can be accumulated in the environment for a long time, and the organic matter has the characteristics of easy biological enrichment, serious environmental pollution, great harm to human bodies and the like. The common organic pollution difficult to degrade comprises toxic and harmful substances such as heterocyclic compounds, polycyclic aromatic hydrocarbons, halogenated hydrocarbons, cyanogen-containing compounds and the like.
In recent years, a lot of work has been carried out around plasma flow control in the united states, france, russia and some domestic research units, and discharge characteristics, experiments, simulation and application progress of the discharge characteristics in various excitation forms including corona discharge, dielectric barrier discharge, plasma synthetic jet and the like in plasma flow control are reviewed. In the last 90 s of the century, the Roth group of the united states studied and perfected an atmospheric pressure dielectric barrier discharge: the surface type dielectric blocks discharge. They applied for patent in 1994, called "atmospheric pressure glow discharge plasma" (OAUGDPTM). The creeping dielectric barrier discharge is a form of dielectric barrier discharge, electrodes are distributed on the upper and lower sides of a dielectric plate, and gas discharge is generated along the dielectric surface above the electrodes, so that the creeping discharge is generally called creeping discharge and can easily generate a uniform plasma layer with a large area on the dielectric surface. The low-voltage electrode has two basic forms of a symmetrical structure and an asymmetrical structure, wherein the asymmetrical structure is an excitation form which is common in the field of flow control, and the low-voltage electrode is packaged in use. The electrode width of the SDBD actuator is usually several mm, the electrode gap is 0 to several cm, and the commonly used dielectric material is teflon, polyimide, organic glass, ceramic, epoxy resin, etc., and the thickness is usually 0.1 to several mm. The pneumatic excitation of the SDBD plasma generated under the action of sine wave high voltage is the most widely studied internationally, and in recent years, driven by the improvement of the plasma flow control capability, the pneumatic excitation of the DBD plasma generated under the action of nanosecond pulse high voltage is increasingly studied internationally.
The SDBD has received general attention from researchers in recent years because on one hand, there is no complete conclusion about its mechanism research, and in addition, it has a wide application prospect in view of the existing research results, which also greatly promotes the development of the research on the surface dielectric barrier discharge itself.
On the other hand, membrane reactors effectively accelerate mass transfer rates, and many reactor configurations, including gas and liquid contact plasmas, have been developed and studied. One key aspect of the reactor system described herein is the utilization of a flowing gas zone in combination with a flowing liquid film. The plasma discharge propagates along the interface of these two regions and the products generated in the vicinity of the plasma channel dissolve rapidly into the liquid film. Has great significance for the research of mass transfer reactors and the treatment of pollutants.
At present, designing and modifying a liquid-phase atmospheric pressure plasma dielectric barrier discharge device is an important direction of plasma scientific research, and how to design a dielectric barrier discharge device with larger gas-liquid contact area, faster mass transfer rate between gas and liquid phases, more active substances and longer service life has important engineering practical significance.
Disclosure of Invention
In view of one or more of the above-mentioned drawbacks of the prior art, the present invention provides a contaminant processing device using bubble-film type dielectric barrier discharge plasma.
In order to achieve the above object, the present invention provides a bubble-film dielectric barrier discharge plasma contaminant processing apparatus, comprising: the method comprises two discharge forms of surface dielectric barrier discharge and streamer discharge; the water inlet pipe and the water outlet pipe of the device are arranged below the inner pipe 1; the discharge assembly comprises a high-voltage electrode, an insulating medium and an aeration disc (a micro-channel element); the grounding electrodes (1-6) of the device are arranged on the wall surface of the outer tube 2 and distributed spirally, so that the electrodes are tightly attached to the wall surface of the tube; the insulating medium is arranged on the high-voltage pole, serves as the outer layer of the high-voltage pole and is made of quartz glass; the aeration disc is positioned below the inner pipe 1, the upper position and the lower position are fixed through the two small circular rings (1-4) and (1-5), gas uniformly enters the inner pipe from the aeration disc through the pore passage components (2-3) under certain pressure, and under the condition of water passing, a water film is formed, so that discharging is started. A plurality of micropores are formed in the microchannel pieces (1-3) and are uniformly distributed; the micro-channel parts (1-3) are made of insulating materials; the device is divided into an upper part and a lower part by flanges (2-4).
By adopting the scheme, when the high-voltage electrode (1-1) works, the high-voltage electrode is externally connected with a high-voltage power supply through a lead, the high-voltage electrode (1-1) is an ionic solution electrode, and an insulating medium (a quartz glass tube) is filled into the ionic solution and is positioned in the center of the inner tube; the earth poles (1-6) of the device are arranged on the outer surface of the inner tube, are distributed in a spiral shape and cling to the surface of the outer wall; the device mainly generates streamer discharge positioned in the inner tube and surface dielectric barrier discharge of the outer wall of the inner tube, and the working characteristics of the device are analyzed as follows:
firstly, when the waste water treatment is carried out in the inner tube 1, plasma formed by discharging through a high-voltage electrode (1-1) enters a liquid phase under the rapid pushing of a large amount of bubbles, and meanwhile, gas is discharged through the surface dielectric barrier of the outer wall of the inner tube to carry a large amount of active substances into the inner tube, so that the treatment effect is further improved, the problem of slow mass transfer of the plasma is solved, the decomposition efficiency is greatly improved, and the purpose of treating refractory organic pollutants by using the low-cost and high-efficiency discharge plasma is realized;
secondly, when in discharge, due to the insulation barrier of the insulation medium, the spark discharge can be avoided, uniform and stable plasma is obtained, and the discharge process has the advantages of short pulse delay, wide applicable voltage frequency range, strong adaptability and the like after the dielectric barrier is performed through the insulation medium.
Thirdly, because the micro-channel elements in the aeration discs (2-3) are positioned below the inner pipe, after the wastewater and the gas are introduced, the micro-channel elements can realize self-cooling in gas-liquid mixed flow, and active substances generated by surface medium barrier discharge generated by the outer wall of the inner pipe also pass through the micro-channel to react with the wastewater on the surface of the aeration discs, so that the survival time of the active substances can be prolonged, and the efficiency can be improved.
Fourthly, because the micropore element is insulated, the electric field can only pass through the pore channel, so that the effect of collecting the electric field is achieved, the initial voltage of discharge is reduced, the utilization rate of energy is improved, and low operation cost is realized.
Preferably, the diameter of the micropores (2-3) is less than 100 um.
Preferably, the microchannel member (2-3) may be any one of a ceramic filter plate, a filter sheet, a quartz aeration plate, a ceramic aeration plate, and a teflon aeration plate.
Furthermore, the insulating medium is quartz glass, and the inner tube and the outer tube are made of organic glass materials.
Further, the high voltage electrode (1-1) is an ionic solution, such as a sodium sulfate solution, a magnesium sulfate solution and the like; the grounding electrodes (1-6) are made of filamentary conductive materials.
Further, the discharge assembly has a plurality. This can multiply the efficiency of pollutant treatment.
The invention has the beneficial effects that:
firstly, when the wastewater in the inner tube is treated, the plasma formed by the discharge of the high-voltage electrode enters different areas in the inner tube under the rapid promotion of a large amount of bubbles, so that the rapid diffusion can be realized, the problem of slow mass transfer of the plasma is solved, the decomposition efficiency is greatly improved, and the treatment of the refractory organic pollutants by the discharge plasma with low cost and high efficiency is realized.
Secondly, when the plasma is discharged, the spark discharge can be avoided due to the insulation and the blocking of the insulating medium, uniform and stable plasma is obtained, and the discharge process has the advantages of short pulse delay, wide applicable voltage frequency range, strong adaptability and the like after the plasma is blocked by the insulating medium.
Thirdly, in the invention, because the micro-channel element in the aeration disc is arranged in the water tank, when wastewater and gas are introduced, the micro-channel element can realize self-cooling in water, and active substances generated by surface dielectric barrier discharge generated by the outer wall of the inner pipe also pass through the micro-channel to react with the wastewater on the surface of the aeration disc, thereby improving the survival time of the active substances and improving the efficiency.
Fourthly, the micropore element is insulated, so that the electric field can only penetrate through the micropores, the effect of collecting the electric field is achieved, the initial voltage of discharge is reduced, the utilization rate of energy is improved, and low operation cost is realized.
Fifthly, the invention can be used for treating waste gas, waste water and waste water simultaneously, meets the treatment of single or/and compound pollutants, has multiple functions and can achieve the aim of one machine with multiple functions;
sixth, the invention arranges the discharge area on the gas-liquid interface, realizes the discharge of the water-gas mixed phase, improves the yield of the active substance, and is beneficial to removing the organic pollutants.
Seventh, the device can be divided into an upper part and a lower part by flanges (2-4), so that the high-voltage electrode end is convenient to modify in order to improve the discharge effect in the experimental operation.
Drawings
FIG. 1 is a schematic diagram of the present invention.
Fig. 2 is a schematic view of a flange.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
example (b): referring to fig. 1, a bubble-film type dielectric barrier discharge plasma pollutant treatment device comprises a high voltage electrode, an insulating medium and an aeration disc.
The lower part of the inner pipe 1 is connected with a water inlet pipe (2-6) and a water outlet pipe (2-7);
the discharge assembly comprises a high-voltage electrode, an insulating medium and an aeration disc; the high-voltage electrode of the device is integrally positioned in the inner tube; the insulating medium is positioned at the central position of the inner tube, and the ion solution is filled in the insulating medium;
The aeration component is positioned at the lower part of the inner pipe and comprises an aeration disc (1-3), a fixing component 1(1-4) and a fixing component 2 (1-5); and a plurality of micropores are arranged on the microchannel pieces (1-3) and are uniformly distributed;
the micro-channel member (2-1) is made of an insulating material; the grounding electrode of the device is positioned on the outer surface of the inner pipe and is spirally distributed outside the inner pipe;
the device is characterized in that the inlet air of the device enters the device after the flow of high-pressure air is regulated by a flowmeter (2-1), and the air uniformly enters a discharge area through a pore passage component (2-3) with the diameter of about 1 mm;
the device is divided into an upper part and a lower part by the flanges (2-4), so that the high-voltage electrode end is conveniently transformed in order to improve the discharge effect in the experiment operation.
Preferably, the micropores (2-1) have a diameter of less than 100 um.
In addition, the micropore (2-1) can be a round hole, a triangular hole, a polygonal hole and the like, and can not be limited by the shape.
Preferably, the microchannel member (2-1) may be any one of a ceramic filter plate, a filter sheet, a quartz aeration plate, a ceramic aeration plate, and a polytetrafluoroethylene aeration plate.
Furthermore, the insulating medium is quartz glass, and the inner tube and the outer tube are made of organic glass materials.
Further, the high voltage electrode (1-1) is an ionic solution, such as a sodium sulfate solution, a magnesium sulfate solution and the like; the grounding electrodes (1-6) are made of filamentary conductive materials.
Further, the discharge assembly has a plurality. This can multiply the efficiency of pollutant treatment.
Furthermore, the device uniformly leads gas into a discharge area through the pore passage component (2-3), under the action of the surface medium barrier of the outer wall of the inner pipe, the gas carries active substances to enter the inner pipe, and the gas is discharged out of the device after the fluid injection discharge of the inner pipe, so that the treatment of waste gas can be realized.
In this embodiment, the ground electrodes (1-6) may be installed on the outer wall of the inner pipe at positions depending on the positions of water films generated by the aeration disks due to the pressure of the gas.
When the high-voltage electrode is in work, the high-voltage electrode (1-1) is externally connected with a high-voltage power supply through a lead, the high-voltage electrode (1-1) is fixed at the center of an inner tube by an insulating medium tube, and discharges in a gas-liquid mixed phase to generate active substances, and the working characteristics of the high-voltage electrode are analyzed as follows:
firstly, when the waste water treatment is carried out in the inner tube 1, plasma formed by discharging through a high-voltage electrode (1-1) enters a liquid phase under the rapid pushing of a large amount of bubbles, and meanwhile, gas is discharged through the surface dielectric barrier of the outer wall of the inner tube to carry a large amount of active substances into the inner tube, so that the treatment effect is further improved, the problem of slow mass transfer of the plasma is solved, the decomposition efficiency is greatly improved, and the purpose of treating refractory organic pollutants by using the low-cost and high-efficiency discharge plasma is realized;
And secondly, during discharge, spark discharge can be avoided due to the insulation barrier of the insulating medium, uniform and stable plasma is obtained, and the discharge process has the advantages of short pulse delay, wide applicable voltage frequency range, strong adaptability and the like after the dielectric barrier is performed through the insulating medium.
Thirdly, because the micro-channel elements in the aeration discs (2-3) are positioned below the inner pipe, after the wastewater and the gas are introduced, the micro-channel elements can realize self-cooling in gas-liquid mixed flow, and active substances generated by surface medium barrier discharge generated by the outer wall of the inner pipe also pass through the micro-channel to react with the wastewater on the surface of the aeration discs, so that the survival time of the active substances can be prolonged, and the efficiency can be improved.
Fourthly, because the micropore element is insulated, the electric field can only penetrate through the pore canal, the effect of gathering the electric field is achieved, the initial voltage of discharging is reduced, the utilization rate of energy is improved, and low operation cost is realized.
The invention has three working states:
first, only the organic wastewater difficult to degrade is treated, namely the main working state of the device. Firstly, gas is introduced from a gas supply pipeline (2-1), then wastewater is introduced from a water inlet pipe (2-6), and after the wastewater contacts a grounding electrode (1-6), a high-voltage power supply is turned on to start discharge treatment, and then the device can run for a long time.
And secondly, only the volatile organic waste gas which is difficult to degrade is treated. Firstly, introducing waste gas from a gas supply pipeline (2-1), then introducing water from a water inlet pipe (2-6), turning on a power supply to start discharging after waste water contacts a grounding electrode (1-6), and finally reducing the speed of introducing water from the water inlet pipe (2-6).
Third, both wastewater and waste gas are treated. Waste gas is respectively introduced from the gas supply pipeline (2-1) and waste water is introduced from the water inlet pipe (2-6), when the liquid level of the liquid phase in the inner pipe contacts the grounding electrode (1-6), the power supply is turned on to start discharging, and then the device can operate for a long time.
Therefore, the invention can be used for the treatment of waste gas, waste water and the synchronous treatment of waste gas, waste water and waste water.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (5)
1. A bubble-film dielectric barrier discharge plasma pollutant treatment device is characterized in that: comprises an inner pipe and an outer pipe, wherein the inner pipe is arranged in the outer pipe; the lower part of the inner tube (1) is connected with a water inlet pipe (2-6) and a water outlet pipe (2-7), and the high-voltage electrode (1-1) is arranged in the center of the inner tube; the high-voltage electrode (1-1) is an ionic solution electrode, and the high-voltage electrode (1-1) is made by filling an insulating medium into an ionic solution; the lower part of the inner pipe is provided with a micro-channel part (1-3), a fixing part 1 (1-4) and a fixing part 2 (1-5), and the fixing parts 1 and 2 are used for fixing the micro-channel part (1-3); micropores which are uniformly distributed are arranged on the microchannel pieces (1-3); the microchannel pieces (1-3) are made of insulating materials; the grounding electrode of the device is positioned on the outer surface of the inner pipe and spirally distributed outside the inner pipe; the device is characterized in that the air inlet of the device is formed by adjusting the flow of high-pressure air through a flowmeter and then enters an outer pipe from an air supply pipeline (2-1); gas is uniformly introduced into the discharge area through a 1mm pore passage component (2-3); the device is divided into an upper part and a lower part by a flange (2-4); liquid to be treated is introduced into the water inlet (2-6) and is discharged from the water outlet (2-7), the liquid enters the upper part of the micro-channel part (1-3), gas is introduced by adjusting the gas flow through the flowmeter, and bubbles are formed through the micro-channel part (1-3) so as to form a water film; a metal wire is wound below the insulating medium and provided with a tip, so that the discharge effect is improved; the ionic solution of the high-voltage electrode is a sodium sulfate solution or a magnesium sulfate solution.
2. The bubble-film dielectric barrier discharge plasma contaminant management device of claim 1, wherein: the diameter of the micropores (1-3) on the microchannel part is less than 100 um.
3. The bubble-film dielectric barrier discharge plasma contaminant management device of claim 1, wherein: the micro-porous pieces (1-3) are any one of a ceramic filter plate, a quartz aeration disc, a ceramic aeration disc and a polytetrafluoroethylene aeration disc.
4. The bubble-film dielectric barrier discharge plasma contaminant management device of claim 1, wherein: the insulating medium is quartz glass.
5. The bubble-film dielectric barrier discharge plasma contaminant management device of claim 1, wherein: the gas introduced into the device is one of oxygen, air, argon or helium.
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| US20050189278A1 (en) * | 2004-02-03 | 2005-09-01 | Takanori Iijima | Apparatus for decomposing organic matter with radical treatment method using electric discharge |
| KR101027522B1 (en) * | 2008-09-10 | 2011-04-06 | (주)화인이테크 | Apparatus for waste-water treatment using dielectric barrier discharge |
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