CN112437531B - Rotary dielectric barrier low-temperature plasma generating device - Google Patents
Rotary dielectric barrier low-temperature plasma generating device Download PDFInfo
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- CN112437531B CN112437531B CN202011095853.XA CN202011095853A CN112437531B CN 112437531 B CN112437531 B CN 112437531B CN 202011095853 A CN202011095853 A CN 202011095853A CN 112437531 B CN112437531 B CN 112437531B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
- H05H1/24—Generating plasma
- H05H1/2406—Generating plasma using dielectric barrier discharges, i.e. with a dielectric interposed between the electrodes
Abstract
The invention discloses a rotary dielectric barrier low-temperature plasma generating device which comprises a power supply, an insulating container, a fixing system for fixing the insulating container, a rotating system arranged in the insulating container and a plasma generator arranged in the insulating container, wherein the rotating system comprises a metal rotating shaft penetrating through the insulating container, a fulcrum shaft and a transmission shaft, the fulcrum shaft and the transmission shaft are arranged on the metal rotating shaft, the metal rotating shaft and the transmission shaft both penetrate through a base, the metal rotating shaft is rigidly connected with the transmission shaft outside the insulating container, and the transmission shaft is connected with an external motor through an insulating transmission device. The invention can stir and mix the substrate, is beneficial to strengthening the mass transfer of active particles emitted by the plasma in a solid phase reaction medium, fully reacts pollutants, synchronously improves the treatment capacity and the treatment efficiency of the low-temperature plasma, and further reduces the energy consumption and the cost for treating the pollutants.
Description
Technical Field
The invention relates to the technical field of plasmas, in particular to a rotary dielectric barrier low-temperature plasma generating device.
Background
Plasma is essentially a conductive fluid consisting of electrons, ions, excited molecular atoms, radicals and neutral particles, and is in a fourth state, in addition to gaseous, liquid and solid states. When voltage is applied to the air, molecules in the air can be decomposed and ionized to generate a mixture of ions, electrons and neutral particles, namely plasma. The development of plasma technology has provided new technologies and processes for further developments in a variety of fields, including environmental pollution abatement and control.
Plasmas are largely classified into two types, i.e., high-temperature plasmas and low-temperature plasmas, according to their electron temperature and ion temperature. In high temperature plasmas, the entire plasma particle of ions and neutral species has the same temperature, known as equilibrium plasma, and has higher ion and electron temperatures. The low-temperature plasma has an ion temperature far lower than that of electrons, and is a non-completely ionized substance system, which is also called non-equilibrium plasma. The energy consumption for low temperature plasma generation is lower compared to high temperature plasma. Inside the low temperature plasma, the electrons are at a much higher temperature than the ions and neutral particles, and energy is concentrated on the energetic electrons, ions, and active particles produced. Common modes of low temperature plasma generation include: dielectric barrier discharge, corona discharge, sliding arc discharge, glow discharge, spark discharge, and the like.
The low-temperature plasma technology has proved to be a technology with application prospect in the aspects of treating soil pollution, water pollution and air pollution. Plasma discharge can generate physical and chemical effects in different forms, active particles are generated to react with pollutants in soil, water or air, or high-energy electrons in an electric field directly react with the pollutants, so that different micromolecule intermediate products are degraded, and finally the micromolecule intermediate products are converted into carbon dioxide, carbon monoxide, water molecules and the like. The plasma technology is usually accompanied with various advanced oxidation effects in the pollutant treatment process, including microwave radiation oxidation effect, ozone oxidation effect, ultraviolet light synergistic catalytic oxidation effect, pyrolysis effect and the like, and is a very complex treatment process.
In summary, it is a problem to be solved urgently how to provide a dynamic low-temperature plasma generating apparatus to enhance the mass transfer of active particles emitted by plasma in a solid-phase reaction medium, so as to fully react pollutants, and to synchronously improve the low-temperature plasma processing amount and processing efficiency, thereby reducing the energy consumption and cost of pollutant processing.
Disclosure of Invention
In order to overcome a series of defects in the prior art, the invention aims to solve the problems and provide a rotary dielectric barrier low-temperature plasma generating device, which comprises a power supply, an insulating container 4, a fixing system for fixing the insulating container 4, a rotating system arranged inside the insulating container 4 and a plasma generator arranged inside the insulating container 4, and is characterized in that,
the main body of the insulating container 4 is a hollow cylinder, two bottom surfaces of the insulating container are connected with the fixing system, and more than one material inlet and outlet are arranged on the side surface of the main body of the insulating container 4;
the fixing system comprises bases connected with the bottom surface of the insulating container 4, fixing rods 8 are arranged between the bases, and the bases and the insulating container 4 are connected together into a rigid body through the fixing rods 8;
the rotating system comprises a metal rotating shaft 9 penetrating through the insulating container 4, a fulcrum shaft 10 arranged on the metal rotating shaft 9 and a transmission shaft, wherein both the metal rotating shaft 9 and the transmission shaft penetrate through the base, the metal rotating shaft 9 is rigidly connected with the transmission shaft outside the insulating container 4, and the transmission shaft is connected with an external motor through an insulating transmission device;
the plasma generator comprises an electrode plate 5, an electrode plate 7, a blocking medium and a fulcrum inner electrode, wherein the electrode plate 5 is fixed on a side plate of the fixing system and is connected with the metal rotating shaft 9; the inner electrode of the fulcrum shaft is connected with the high-voltage output end of the power supply through a metal rotating shaft 9 and a lead; the electrode plate 7 is arranged on the outer side of the bottom of the insulating container 4 and is connected with the low-voltage input end of the power supply through a lead; the barrier medium is the portion of the insulating container 4 to which the electrode sheet 7 is attached, and plasma is generated in the gap between the end of the fulcrum 10 and the electrode sheet 7.
Preferably, the power supply is a high-frequency alternating current power supply, and the output voltage is 0-250V.
Preferably, the rotation speed of the external motor is 90-1350 rpm.
Preferably, the electrode plate 5, the electrode sheet 7, the metal rotating shaft 9, and the support shaft 10 are all made of a metal material having good electrical conductivity.
Preferably, the insulating container 4 is made of glass.
Preferably, the treatment material is particulate matter or soil or sludge or other solid matter.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a rotary type dielectric barrier low-temperature plasma generating device, which can stir and mix solid substances, is beneficial to strengthening the mass transfer of active particles emitted by plasma in a solid-phase reaction medium, fully reacts pollutants, synchronously improves the treatment capacity and treatment efficiency of low-temperature plasma, and further reduces the energy consumption and cost of pollution treatment.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a rotary dielectric barrier low-temperature plasma generating device according to the present invention;
FIG. 2 is a front view of a rotary dielectric barrier low temperature plasma generating device of the present invention;
FIG. 3 is a top view of a rotary dielectric barrier low temperature plasma generating device of the present invention;
FIG. 4 is a side view of a rotary dielectric barrier low temperature plasma generating device of the present invention;
FIG. 5 is a schematic diagram of a plasma generating position of a plasma generating device of the rotary dielectric barrier low-temperature plasma generating device of the invention.
The reference numbers in the figures are:
1-insulating transmission device, 2-base I, 3-feeding hole, 4-insulating container, 5-electrode plate, 6-base II, 7-electrode plate, 8-fixing rod, 9-metal rotating shaft, 10-fulcrum shaft and 11-plasma discharge area.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, but not all embodiments of the invention.
All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiments and the directional terms described below with reference to the drawings are exemplary and intended to be used in the explanation of the invention, and should not be construed as limiting the invention.
The rotary dielectric barrier low-temperature plasma generating device of the invention is described in detail with reference to the accompanying drawings.
As shown in fig. 1 to 5, a rotary dielectric barrier low temperature plasma generating device comprises a power supply, an insulating container 4, a fixing system for fixing the insulating container 4, a rotating system arranged inside the insulating container 4, and a plasma generator arranged inside the insulating container 4,
the main body of the insulating container 4 is a hollow cylinder, two bottom surfaces of the insulating container are connected with the fixing system, and more than one material inlet and outlet are arranged on the side surface of the main body of the insulating container 4;
the fixing system comprises bases connected with the bottom surface of the insulating container 4, fixing rods 8 are arranged between the bases, and the bases and the insulating container 4 are connected together to form a rigid body through the fixing rods 8;
the rotating system comprises a metal rotating shaft 9 penetrating through the insulating container 4, a fulcrum shaft 10 arranged on the metal rotating shaft 9 and a transmission shaft, wherein the metal rotating shaft 9 and the transmission shaft both penetrate through the base, the metal rotating shaft 9 is rigidly connected with the transmission shaft outside the insulating container 4, and the transmission shaft is connected with an external motor through an insulating transmission device;
the plasma generator comprises an electrode plate 5, an electrode plate 7, a blocking medium and a fulcrum inner electrode, wherein the electrode plate 5 is fixed on the base and is connected with the metal rotating shaft 9; the inner electrode of the fulcrum shaft is connected with the high-voltage output end of the power supply through a metal rotating shaft 9 and a lead; the electrode plate 7 is arranged at the bottom of the insulating container 4 and is connected with the low-voltage input end of the power supply through a lead; the barrier medium is the portion of the insulating container 4 to which the electrode sheet 7 is attached, and plasma is generated in the gap between the end of the fulcrum 10 and the electrode sheet 7.
Preferably, the power supply is a high-frequency alternating current power supply, and the output voltage is 0-250V.
Preferably, the rotation speed of the external motor is 90-1350 rpm.
Preferably, the electrode plate 5, the electrode sheet 7, the metal rotating shaft 9, and the support shaft 10 are all made of a metal material having good electrical conductivity.
Preferably, the insulating container 4 is made of glass.
Preferably, the treatment material is particulate matter or soil or sludge or other solid matter.
The present invention will be described in further detail below with reference to the accompanying drawings, which illustrate preferred embodiments of the present invention.
As shown in fig. 2-4, a rotary dielectric barrier low-temperature plasma generating device specifically comprises an insulating transmission device 1, a base I2, a feeding port 3, an insulating container 4, an electrode plate 5, a base II6, an electrode plate 7, a fixing rod 8, a metal rotating shaft 9 and a fulcrum shaft 10, wherein,
four metal fixing rods 8, a base II6 and a base I2 form a stable structure for fixing the insulating container 4;
the metal rotating shaft 9 penetrates through the insulating container 4, and two ends of the metal rotating shaft are connected to the base II6 and the base I2;
the metal rotating shaft 9 penetrates through the fulcrum 10, and the metal rotating shaft 9 and the fulcrum 10 are rigidly connected together;
the electrode plate 5 is fixed at the outer side of the base II6, and the metal rotating shaft 9 penetrates through the base II6 and is connected with the electrode plate 5;
the electrode plate 7 is fixed on the outer side of the bottom of the insulating container 4, and the part of the insulating container 4 corresponding to the fixed position of the electrode plate 7 is a blocking medium;
the metal rotating shaft 9 penetrates through the base I2 and is connected with a transmission device;
the feed inlet 3 is arranged above the side of the insulating container 4, so that feeding and sampling are facilitated.
As shown in fig. 5, low-temperature plasma is generated in the plasma discharge region 11 from the end of the support shaft 10 to the electrode piece 7, and low-temperature plasma is not generated in the other space of the insulating container 4.
In the preferred embodiment, taking soil containing pollutants as an example, the soil is added into the insulating container 4 through the feed inlet 3, and fills the plasma discharge area 11 to a thickness not exceeding the lower end of the fulcrum 10; then, starting an external motor, driving the metal rotating shaft 9 to rotate through the transmission device 1, further driving the fulcrum shaft 10 to rotate, and disturbing the added soil to enable the added soil to be mixed more uniformly; the material inlet and outlet are sealed by a rubber plug.
Further, the power supply is turned on, and the direction of a current circuit is that the plasma is formed in a plasma discharge area 11 through a high-voltage output end of the power supply, an electrode plate 5 through a conducting wire, a metal rotating shaft 9 through the electrode plate 5, each support shaft 10 through the metal rotating shaft 9, a barrier medium to an electrode plate 7, and finally a low-voltage input end of the power supply through the conducting wire, so that the whole path is formed.
Further, the plasma generator generates a large amount of active substances including energetic electrons, ozone, hydroxyl radicals, active oxygen molecules, oxygen radicals, etc. by high-voltage discharge, which diffuse in a gas phase environment and in the gaps of soil, come into contact with target pollutants and undergo oxidation reaction. Finally to CO, CO2 and H2Small molecules such as O and the like do not contain harmful substances and a small amount of hydrocarbon byproducts, thereby achieving the purpose of restoring the ecological function of the polluted soil.
Finally, it should be pointed out that: the above examples are only for illustrating the technical solutions of the present invention, and are not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. A rotary dielectric barrier low-temperature plasma generating device comprises a power supply, an insulating container (4), a fixing system for fixing the insulating container (4), a rotating system arranged in the insulating container (4), and a plasma generator arranged in the insulating container (4),
the main body of the insulating container (4) is a hollow cylindrical body, the two bottom surfaces of the insulating container are connected with the fixing system, and the side surface of the main body of the insulating container (4) is provided with at least one material inlet and outlet for introducing carrier gas;
the fixing system comprises bases connected with the bottom surface of the insulating container (4), fixing rods (8) are arranged between the bases, and the bases and the insulating container (4) are connected together to form a rigid body through the fixing rods (8);
the rotating system comprises a metal rotating shaft (9) penetrating through the insulating container (4), a fulcrum shaft (10) arranged on the metal rotating shaft (9) and a transmission shaft, wherein the metal rotating shaft (9) and the transmission shaft both penetrate through the base, the metal rotating shaft (9) is rigidly connected with the transmission shaft outside the insulating container (4), and the transmission shaft is connected with an external motor through an insulating transmission device;
the plasma generator comprises an electrode plate (5), an electrode plate (7), a blocking medium and a fulcrum inner electrode, wherein the electrode plate (5) is fixed on a side plate of the fixing system and connected with the metal rotating shaft (9), the fulcrum inner electrode is connected with a high-voltage output end of the power supply through the metal rotating shaft (9) and a lead, the electrode plate (7) is arranged on the outer side of the insulating container (4) and wraps the area of the outer cylinder 1/2 upwards from the bottom, the electrode plate (7) is connected with a low-voltage input end of the power supply through the lead, the blocking medium is the part, attached to the electrode plate (7), of the insulating container (4), and plasma is generated in a gap between the tail end of the fulcrum (10) and the electrode plate (7).
2. The rotary dielectric barrier low-temperature plasma generating device as claimed in claim 1, wherein the power supply is a high-frequency alternating current power supply, and the output voltage is 0-250V.
3. A rotary dielectric barrier cryogenic plasma generating device as claimed in claim 1 wherein the external motor is rotated at 90-1350 rpm.
4. A rotary dielectric barrier low-temperature plasma generating device according to claim 1, wherein the electrode plate (5), the electrode plate (7), the metal rotating shaft (9) and the fulcrum shaft (10) are all made of metal materials with good electric conductivity.
5. A rotary dielectric barrier low temperature plasma generating device according to claim 1, wherein the insulating container (4) is made of glass.
6. The rotary dielectric barrier low-temperature plasma generating device as claimed in claim 1, wherein the processing raw material is soil, sludge, excrement or industrial solid slag.
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