Dielectric barrier plasma gas treatment device

Abstract

The utility model belongs to the technical field of plasmas, and relates to a dielectric barrier plasma gas treatment device which comprises an isolation protection box, a dielectric barrier reactor, a protection device and a pressure regulator, the dielectric barrier reactor and the protection device are arranged in the isolation protection box, and the pressure regulator is arranged outside the isolation protection box; the dielectric barrier reactor is connected with the pressure regulator through the protection device, the isolation protection box is respectively provided with a waste gas inlet and a purified gas outlet, and the waste gas inlet is communicated with the purified gas outlet through the dielectric barrier reactor. According to the utility model, the dielectric barrier reactor is arranged in the isolation protection box, the protection device is arranged in the isolation protection box, and the dielectric barrier reactor is connected with the voltage regulator through the protection device, so that the electric shock danger during high-voltage operation is avoided, and the operation safety is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of plasma and relates to a dielectric barrier plasma gas processing device. Background Art

[0002] Organic waste gas in industrial waste gas has many harmful effects on human health. The toxicity of organic waste gas in different industries is also different. With the development of industry, the emission of organic waste gas has increased rapidly, and its management has become increasingly important to people. After organic waste gas enters the human body through the respiratory tract and skin, it can cause temporary and permanent lesions in the respiratory, blood, liver and other systems and organs. In particular, benzopyrene-type polycyclic aromatic hydrocarbons can directly cause cancer in the human body. Therefore, the emission of such gases should be limited.

[0003] Volatile organic compounds (VOCs) are important precursors of PM2.5 and ozone pollution. Following sulfur oxides, nitrogen oxides and freons, pollution from volatile organic compounds has become the focus of attention of countries around the world. Developed countries and regions have continuously revised their laws to reduce the emission concentration of VOCs. There are many types of organic waste gas, which are often complex in composition and have irregular changes in concentration, which makes it difficult to manage. Therefore, it is urgent to seek effective treatment technology for this type of waste gas. At present, researchers have increased their research and development efforts on organic waste gas treatment technology, promoted advanced VOCs treatment technology, equipment and experience, and continuously promoted the refinement and standardization of VOCs emission reduction and control work.

[0004] Industrial waste gas treatment technologies are mainly divided into two categories: recovery method and elimination method. These two methods have their own advantages, but they still encounter many problems in practical applications: such as excessive consumption of process resources, high annual operating costs, and limitations of various treatment technologies when dealing with different waste gases.

[0005] Low-temperature plasma technology is considered to be one of the few practical processes that can achieve simultaneous control of complex pollutants. Commonly used low-temperature plasma discharge methods are divided into glow discharge, corona discharge, dielectric barrier discharge, etc. Dielectric barrier discharge is a non-thermal equilibrium plasma technology that can treat mixed gases with good treatment effects. For example, the patent document with the announcement number CN204891560U and the name of the new tubular dielectric barrier discharge plasma waste gas purification device discloses that dielectric barrier discharge can use glass tubes or other materials as insulating media, and a conductive coating is applied on the outer wall of the outer glass tube, and a conductive coating is also applied on the inner wall of the inner glass tube; the conductive coating method can be used in different insulating media, which greatly reduces the design cost. The sinusoidal AC high-voltage voltage regulator is connected to the outer conductive layer and the inner conductive layer. When the voltage reaches a certain level, insulation breakdown will occur, generating a large amount of pulse current, discharging on the surface of the glass tube, and generating a blue luminous discharge in the space between the two glass tubes. A large number of free radicals and excimers will be generated during the discharge process, and the organic waste gas will be purified when it passes through the discharge space. Although the existing device can purify organic gases, it still has the following technical defects: since high voltage is generated instantaneously during the plasma generation process, there is a risk of electric shock during operation, resulting in unsafe operation under working conditions; in addition, the existing dielectric barrier reactor has poor air tightness, resulting in poor gas purification effect. Utility Model Content

[0006] Aiming at the technical problem that the existing plasma equipment is unsafe to operate in a working state, the utility model provides a dielectric barrier plasma gas processing device.

[0007] The utility model places a dielectric barrier reactor in an isolation protection box, the dielectric barrier reactor is connected to a voltage regulator via a protection device, and is electrically connected to a micro switch via the protection device, thereby avoiding the risk of electric shock during high-voltage operation and improving operation safety.

[0008] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0009] A dielectric barrier plasma gas processing device comprises an isolation protection box, a dielectric barrier reactor, a micro switch, a protection device and a voltage regulator; the dielectric barrier reactor and the protection device are both placed in the isolation protection box, the micro switch is placed on the isolation protection box and is electrically connected to the protection device, and the voltage regulator is placed outside the isolation protection box; the dielectric barrier reactor is connected to the voltage regulator via the protection device, and an exhaust gas inlet and a purified gas outlet are respectively arranged on the isolation protection box, and the exhaust gas inlet is connected to the purified gas outlet via the dielectric barrier reactor.

[0010] It is further defined that the dielectric barrier reactor includes a shell, an inner electrode and an outer electrode, the shell is placed in an isolation protection box, the inner electrode is located in the shell, the outer electrode is laid on the outer wall of the shell, the inner electrode and the outer electrode are both connected to a protection device, and the exhaust gas inlet is connected to the purified gas outlet through the shell.

[0011] It is further defined that the central axis of the inner electrode coincides with the central axis of the shell, the inner electrode and the outer electrode are of equal length; and the inner electrode and the outer electrode are disposed at corresponding positions on the shell.

[0012] It is further defined that the shell is a hollow tube with an opening at one end, a rubber plug is provided on the opening, and a sealing ring is also provided between the rubber plug and the inner wall of the shell.

[0013] It is further defined that a cavity is formed between the inner electrode and the shell, and the cavity is filled with a catalyst assembly.

[0014] It is further defined that the hollow tube is a quartz glass tube, an alumina tube, a ceramic tube or a mica tube; the inner electrode is a cylindrical conductive metal electrode; and the outer electrode is a mesh conductive metal electrode.

[0015] It is further defined that an air inlet pipe and an air outlet pipe are respectively connected to the outer wall of the shell; the air inlet pipe is connected to the air outlet pipe through the inner electrode; the air inlet pipe is connected to the exhaust gas inlet; and the air outlet pipe is connected to the purified gas outlet.

[0016] It is further defined that the dielectric barrier plasma gas processing device also includes an exhaust gas pipeline externally connected to the exhaust gas inlet and a purification pipeline externally connected to the purified gas outlet; the exhaust gas pipeline and the purification pipeline are respectively connected to flow meters, and the flow meters are placed on the outer wall of the isolation protection box.

[0017] It is further defined that the dielectric barrier plasma gas processing device also includes a power meter located outside the isolation protection box and connected to the voltage regulator.

[0018] It is further defined that the dielectric barrier plasma gas processing device also includes a digital oscilloscope located outside the isolation protection box; the digital oscilloscope is connected to the voltage regulator.

[0019] The beneficial effects of the utility model are:

[0020] 1. The utility model places the dielectric barrier reactor in an isolation protection box, which is provided with a protection device. The dielectric barrier reactor is connected to the voltage regulator via the protection device. The micro switch is placed on the isolation protection box and is electrically connected to the protection device. In the working state, the isolation protection box is opened, and the micro switch sends a signal to automatically cut off the power to the dielectric barrier reactor, thereby avoiding the risk of electric shock during high-voltage operation and improving operational safety.

[0021] 2. In the utility model, a rubber plug is provided on the opening of the shell to ensure air tightness, and a sealing ring is further provided between the rubber plug and the inner wall of the shell to enhance the sealing, thereby improving the purification effect.

[0022] 3. In the utility model, the hollow tube is a quartz glass tube, an alumina tube, a ceramic tube or a mica tube; the inner electrode is a cylindrical conductive metal electrode; the outer electrode is a mesh conductive metal electrode. When in use, the corresponding material can be selected according to the VOCs gas to be treated, thereby expanding the application range of the device.

[0023] 4. In the utility model, the dielectric barrier plasma gas treatment device also includes an exhaust gas pipeline externally connected to the exhaust gas inlet and a purification pipeline externally connected to the purified gas outlet; flow meters are respectively connected to the exhaust gas pipeline and the purification pipeline, and the flow of the treated gas entering the isolation protection box and the purified gas is controlled by the flow meter, which has strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a structural diagram of the utility model device;

[0025] Figure 2 This is a structural diagram of a dielectric barrier reactor;

[0026] in:

[0027] 1—isolation protection box; 101—exhaust gas inlet; 102—purified gas outlet; 2—dielectric barrier reactor; 201—shell; 202—inlet pipe; 203—outlet pipe; 204—inner electrode; 205—outer electrode; 206—rubber plug; 207—catalyst assembly; 3—protection device; 4—flow meter; 5—power meter; 6—voltage regulator. DETAILED DESCRIPTION

[0028] The technical solution of the utility model will be described clearly and in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the implementation methods of the utility model, rather than all of the implementation methods, and cannot be used as a limitation on the protection scope of the utility model.

[0029] Example 1

[0030] See also Figure 1The dielectric barrier plasma gas treatment device provided in this embodiment includes an isolation protection box 1, a dielectric barrier reactor 2, a micro switch, a protection device 3 and a voltage regulator 6; the dielectric barrier reactor 2 and the protection device 3 are both placed in the isolation protection box 1, the micro switch is placed on the isolation protection box 1 and is electrically connected to the protection device 3, and the voltage regulator 6 is placed outside the isolation protection box 1; the dielectric barrier reactor 2 is connected to the voltage regulator 6 via the protection device 3, and the isolation protection box 1 is respectively provided with an exhaust gas inlet 101 and a purified gas outlet 102, and the exhaust gas inlet 101 is connected to the purified gas outlet 102 via the dielectric barrier reactor 2.

[0031] Specifically, the isolation protection box 1 includes a main body and a box cover. The main body is a rectangular parallelepiped, 45 cm long, 40 cm wide, and 25 cm high. The box cover is arranged on the main body, and an inner cavity is arranged inside the main body. The medium barrier reactor 2 is placed in the inner cavity, and an exhaust gas inlet 101 and a purified gas outlet 102 are respectively opened on the opposite side walls of the inner cavity.

[0032] Preferably, the exhaust gas inlet 101 and the purified gas outlet 102 are both circular holes, and the hole diameters are both 15 mm. The isolation protection box 1 is made of acrylic or organic glass.

[0033] The box cover is movably connected to the body, and a micro switch (not shown in the figure) is placed on the box cover. The opening or closing of the box cover is sensed by the micro switch, and the sensed electrical signal is transmitted to the protection device 3. When the box cover is closed, the micro switch transmits the electrical signal to the protection device 3, and then the protection device 3 controls the dielectric barrier reactor 2 to work according to the received electrical signal; conversely, when the box cover is opened, the protection device 3 controls the dielectric barrier reactor 2 to stop working according to the received electrical signal. In this way, when the dielectric barrier reactor 2 is in the working state and the isolation protection box 1 is opened, the dielectric barrier reactor 2 will automatically cut off the power, which plays a role in preventing electric shock and protecting personal safety.

[0034] Preferably, the micro switch is the V-15 series micro switch of Huangrun Electric.

[0035] The function of the protection device 3 is to prevent the dielectric barrier reactor 2 from accidentally opening and the voltage from being too high, thereby effectively protecting the safety of the experimenters. The protection device 3 is preferably a relay, and other components with the same function may also be used as a substitute.

[0036] In this embodiment, the voltage regulator 6 is a high-voltage AC voltage regulator with a voltage of 0V to 250V and a load power of 1000W. When in use, the voltage during the treatment process is adjusted to an appropriate value through the voltage regulator 6 according to the gas to be treated and the corresponding catalyst type, so that the catalyst exhibits a better catalytic effect and improves the gas treatment and purification effect.

[0037] In this embodiment, the dielectric barrier plasma gas processing device further includes a power meter 5 located outside the isolation protection box 1 and connected to the voltage regulator 6 .

[0038] The power meter 5 is mainly used to monitor the accumulated electricity, accumulated time and the generated CO2 content in the gas processing, and is used to calculate the energy consumption of the device.

[0039] In this embodiment, the dielectric barrier plasma gas processing device further includes a digital oscilloscope (not shown in the figure) located outside the isolation protection box 1 , and the digital oscilloscope is connected to the voltage regulator 6 .

[0040] Digital oscilloscope to monitor voltage, current and power parameters in gas processing.

[0041] When the dielectric barrier plasma gas treatment device is working, high voltage electricity is introduced into the dielectric barrier reactor 2, a plasma discharge zone is formed in the dielectric barrier reactor 2, and a high voltage of 1-10eV is instantly formed. At this time, the instantaneous temperature in the discharge zone reaches tens of thousands of K. When the industrial VOCs waste gas passes through the narrow plasma discharge zone, the gas molecules are bombarded by the high energy of the plasma, causing the molecules to be excited, dissociated or ionized, thereby initiating a chemical reaction, thereby achieving the decomposition, purification and conversion of the VOCs gas.

[0042] Example 2

[0043] See also Figure 1 and Figure 2 On the basis of Example 1, in the dielectric barrier plasma gas treatment device provided in this embodiment, the dielectric barrier reactor 2 includes a shell 201, an inner electrode 204 and an outer electrode 205, the shell 201 is placed in the isolation protection box 1, the inner electrode 204 is located in the shell 201, and the outer electrode 205 is laid on the outer wall of the shell 201. The inner electrode 204 and the outer electrode 205 are both connected to the protection device 3, and the exhaust gas inlet 101 is connected to the purified gas outlet 102 through the shell 201.

[0044] In this embodiment, the central axis of the inner electrode 204 coincides with the central axis of the shell 201 , and the lengths of the inner electrode 204 and the outer electrode 205 are equal.

[0045] Preferably, when the inner electrode 204 and the outer electrode 205 are arranged on the shell 201, their arrangement positions correspond to each other. This is because high voltage electricity is passed between the inner electrode 204 and the outer electrode 205, and a plasma discharge zone is formed in the cavity between the inner wall of the shell 201 and the inner electrode 204, so that a high voltage of 1 to 10 eV is instantly formed in the overlapping area of ​​the inner electrode 204 and the outer electrode 205, and then the instantaneous temperature in the discharge zone reaches tens of thousands of K, and when the VOCs gas to be treated passes through the cavity in the shell, the VOCs gas is decomposed, purified and converted.

[0046] In this embodiment, when the inner electrode 204 is located in the shell 201, a cavity is formed between the inner electrode 204 and the shell 201, and the cavity is filled with a catalyst assembly 207. When treating different VOCs gases, different catalysts are selected to improve the treatment effect.

[0047] Specifically, the catalyst assembly 207 includes two asbestos layers and a catalyst sandwiched between the two asbestos layers, so that the catalyst assembly 207 is conveniently fixed in the cavity. The type and amount of the catalyst are selected and designed according to the treated gas and are not limited here.

[0048] Specifically, the housing 201 is a hollow tube with one end open, and a rubber plug 206 is disposed on the opening. The hollow tube is a quartz glass tube, an alumina tube, a ceramic tube or a mica tube; the inner electrode 204 is a cylindrical conductive metal electrode; and the outer electrode 205 is a mesh conductive metal electrode.

[0049] During implementation, the shell 201 is a hollow tube made of quartz glass, alumina material, ceramic material or mica material; the inner electrode 204 is a conductive metal electrode (cylindrical structure) made of stainless steel, copper, aluminum, iron and other materials; the outer electrode 205 is a conductive metal electrode (mesh structure) made of stainless steel mesh, copper mesh, wire mesh and other materials.

[0050] When in use, the materials of the shell 201, the inner electrode 204 and the outer electrode 205 are selected according to the VOCs gas to be purified and the treatment effect to be achieved, so as to expand the application range of the entire device, but the specific selection of materials is not limited in the present utility model.

[0051] Furthermore, in order to enhance air tightness, a sealing ring is provided between the rubber stopper 206 and the inner wall of the housing 201 .

[0052] An air inlet pipe 202 and an air outlet pipe 203 are respectively arranged on the outer wall of the shell 201; the air inlet pipe 202 is connected to the air outlet pipe 203 through the inner electrode 204; the air inlet pipe 202 is connected to the exhaust gas inlet 101; and the air outlet pipe 203 is connected to the purified gas outlet 102.

[0053] Preferably, the shell 201 is a hollow cylindrical tube structure, made of quartz glass, with an inner diameter of 15 mm, a wall thickness of 3 mm, and a length of 30 cm. An air inlet pipe 202 and an air outlet pipe 203 are respectively provided at both ends of the shell 201. The air inlet pipe 202 and the air outlet pipe 203 have the same size, both are 5 mm in length and 3 mm in outer diameter.

[0054] Preferably, the inner electrode 204 is a cylindrical stainless steel electrode, 18 cm long and 9 mm in diameter. The inner electrode 204 is axially aligned with the shell 201, and there is a cavity between the inner electrode 204 and the inner wall of the shell 201. A wire is provided on one end of the inner electrode 204, and the wire passes through the rubber plug 206 and extends from the inside of the shell 201 and is connected to the protective device 3. The outer electrode 205 is a stainless steel mesh structure, which is laid (or wound) on the outer wall of the shell 201, and the area of ​​the outer electrode 205 is 54 cm 2 A wire is provided on the outer electrode 205, and the outer electrode 205 is also connected to the protection device 3 through the wire.

[0055] Example 3

[0056] Based on Example 2, the dielectric barrier plasma gas treatment device provided in this embodiment also includes an exhaust gas pipeline externally connected to the exhaust gas inlet 101 and a purification pipeline externally connected to the purified gas outlet 102; the exhaust gas pipeline and the purification pipeline are respectively connected to flow meters 4, and the flow meters 4 are both placed on the outer wall of the isolation protection box 1.

[0057] Preferably, the flow meter 4 is a rotor flow meter to monitor the air inlet flow rate entering the isolation protection box 1 and the air outlet flow rate flowing out of the isolation protection box 1 .

[0058] The above-mentioned embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope thereof is not limited thereto. Any equivalent substitution or change made by a person skilled in the art based on the present invention shall fall within the protection scope of the present invention.

Claims

1. A dielectric barrier plasma gas treatment device, characterized in that: The invention comprises an isolation protection box (1), a dielectric barrier reactor (2), a micro switch, a protection device (3) and a voltage regulator (6); the dielectric barrier reactor (2) and the protection device (3) are both placed in the isolation protection box (1), the micro switch is placed on the isolation protection box (1) and is electrically connected to the protection device (3), and the voltage regulator (6) is placed outside the isolation protection box (1); the dielectric barrier reactor (2) is connected to the voltage regulator (6) via the protection device (3), and an exhaust gas inlet (101) and a purified gas outlet (102) are respectively arranged on the isolation protection box (1), and the exhaust gas inlet (101) is connected to the purified gas outlet (102) via the dielectric barrier reactor (2).

2. The dielectric barrier plasma gas treatment device according to claim 1, characterized in that: The dielectric barrier reactor (2) comprises a shell (201), an inner electrode (204) and an outer electrode (205); the shell (201) is placed in an isolation protection box (1); the inner electrode (204) is located in the shell (201); the outer electrode (205) is laid on the outer wall of the shell (201); the inner electrode (204) and the outer electrode (205) are both connected to a protection device (3); and the exhaust gas inlet (101) is connected to the purified gas outlet (102) via the shell (201).

3. The dielectric barrier plasma gas treatment device according to claim 2, characterized in that: The central axis of the inner electrode (204) coincides with the central axis of the shell (201), the inner electrode (204) and the outer electrode (205) are of equal length, and the inner electrode (204) and the outer electrode (205) are disposed at corresponding positions on the shell (201).

4. The dielectric barrier plasma gas treatment device according to claim 3, characterized in that: The shell (201) is a hollow tube with an opening at one end, and a rubber plug (206) is arranged on the opening; a sealing ring is also arranged between the rubber plug (206) and the inner wall of the shell (201).

5. The dielectric barrier plasma gas treatment device according to claim 3, characterized in that: A cavity is formed between the inner electrode (204) and the shell (201), and the cavity is filled with a catalyst assembly (207).

6. The dielectric barrier plasma gas processing device according to claim 4, characterized in that: The hollow tube is a quartz glass tube, an alumina tube, a ceramic tube or a mica tube; the inner electrode (204) is a cylindrical conductive metal electrode; and the outer electrode (205) is a mesh conductive metal electrode.

7. The dielectric barrier plasma gas processing device according to claim 3, characterized in that: An air inlet pipe (202) and an air outlet pipe (203) are respectively connected to the outer wall of the shell (201); the air inlet pipe (202) is connected to the air outlet pipe (203) via the inner electrode (204); the air inlet pipe (202) is connected to the exhaust gas inlet (101); and the air outlet pipe (203) is connected to the purified gas outlet (102).

8. The dielectric barrier plasma gas treatment device according to any one of claims 1 to 7, characterized in that: The dielectric barrier plasma gas treatment device further comprises an exhaust gas pipeline externally connected to the exhaust gas inlet (101) and a purification pipeline externally connected to the purified gas outlet (102); the exhaust gas pipeline and the purification pipeline are respectively connected to flow meters (4), and the flow meters (4) are both placed on the outer wall of the isolation protection box (1).

9. The dielectric barrier plasma gas processing device according to claim 8, characterized in that: The dielectric barrier plasma gas processing device also includes a power meter (5) located outside the isolation protection box (1) and connected to the voltage regulator (6).

10. The dielectric barrier plasma gas processing device according to claim 9, characterized in that: The dielectric barrier plasma gas processing device also includes a digital oscilloscope located outside the isolation protection box (1); the digital oscilloscope is connected to the voltage regulator (6).

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