CN116392964A - Dielectrophoresis gas purification unit module and method based on high dielectric material - Google Patents

Abstract

The invention discloses a dielectrophoresis gas purification unit module and a dielectrophoresis gas purification method based on a high dielectric material, and relates to the technical field of energy conservation, environmental protection and separation of solids from fluid and high-voltage electric field separation. The purifying unit module comprises a dielectrophoresis electrode structure and an alternating current power supply, the dielectrophoresis electrode structure comprises an annular barrel-shaped electrode, a central electrode is arranged at the axial position of the annular barrel-shaped electrode, supporting frames are arranged at two ends of the annular barrel-shaped electrode, the central electrode is connected with the annular barrel-shaped electrode through the supporting frames, the annular barrel-shaped electrode, the supporting frames and the central electrode form a cavity structure, and high-dielectric ceramic spheres are filled in the cavity structure; and one pole of the alternating current power supply is connected with the central electrode, and the other pole of the alternating current power supply is connected with the annular barrel-shaped electrode. The dielectrophoresis gas purification unit module provided by the invention has the advantages of simple and stable structure, high purification efficiency, no need of replacing a filter screen, convenience in cleaning, capability of purifying tiny particles and small wind resistance.

Description

Dielectrophoretic gas purification unit module and method based on high dielectric material

technical field

The invention relates to the technical field of energy saving and environmental protection and the separation of solids from fluids, in particular to a dielectrophoresis gas purification unit module and method based on high dielectric materials.

Background technique

In order to achieve a lower concentration of dust pollutant emissions, companies need dust removal equipment with better performance. At present, there are many kinds of dust removal equipment for the purification of dust particles in the air, including mechanical dust collectors, electric dust collectors, wet dust collectors and filter dust collectors, but the above dust collectors mainly deal with larger dust in the air. For tiny particles, especially inhalable particles, the existing dust removal equipment is not effective in removing dust, and the content of tiny dust in air pollution cannot be ignored, which is an important reason for the formation of smog.

Existing air purification technologies include: adsorption technology, negative (positive) ion technology, catalytic technology, photocatalyst technology, superstructure photomineralization technology, HEPA high-efficiency filtration technology, electrostatic dust collection technology, etc. No matter which technology is used, most of them have problems such as complex structure, troublesome production, high cost, short service life of main components, and frequent replacement of components, which increases expenses. For example, in some filter-type filter dust removal technologies, extremely fine particles may slip through the screen, the dust removal effect is not ideal, and the filter screen needs to be replaced frequently; the electrostatic dust removal method uses a high-voltage DC electric field to generate electricity from gas molecules in the air. A large number of electrons and ions move to the poles under the action of the electric field force. During the movement, they encounter dust particles in the airflow to charge them. The charged particles move to the plate under the action of the electric field force to realize solid particles or liquid particles. Separated from the air flow, the equipment involved in this high-voltage electrostatic precipitator technology is complex and consumes a lot of energy during operation.

Different from tubular electrostatic precipitators and plate electrostatic precipitators, which are widely used in industry at present, dielectrophoretic dust removal has different characteristics:

First of all, the dielectrophoresis technology manipulates neutral particles to cause translational motion due to the effect of dielectric polarization; while the electrostatic dust removal technology manipulates electrons and ions to make the dust particles move directional after being loaded.

Secondly, the direction of particle movement in dielectrophoresis technology has nothing to do with the direction of the electric field, but only with its own dielectric constant and the dielectric constant of the medium; while in electrostatic dust removal technology, the direction of particle movement depends on the sign of the charge on the particle and the value of the electric field. If the direction of the electric field is reversed, the direction of motion is reversed.

Furthermore, the dielectrophoretic technology requires a non-uniform electric field; while the electrostatic precipitator technology requires a uniform or non-uniform DC electric field.

In addition, the adsorption force of the dust in the dielectrophoretic technology comes from the dielectrophoretic force, and the size of the dielectrophoretic force is proportional to the cube of the particle diameter and the square of the electric field gradient; The size of the particle is proportional to the amount of charge carried by the particle, so the dust removal effect is directly related to the charge carried by the dust particle.

In the existing dielectrophoretic dust removal technology, the patent application No. 201410407467.8 discloses a dielectrophoretic electrode structure, and proposes a dielectrophoretic electrode structure, which includes parallel or roughly parallel arrangements along the first direction The first wire group, the second wire group arranged in parallel or substantially parallel along the second direction, the wires in the first wire group and the second wire group have an insulating layer on the outside, the first direction is not parallel to the second direction, The wires in the first wire group and the second wire group are intertwined together, some of the wires in the first wire group and the second wire group are connected to the positive pole of the power supply, and the other part is connected to the negative pole of the power supply. In addition, the dielectrophoretic electrodes used in this patented technology are independent strips and are connected to the corresponding output terminals of the AC power supply through wires. They need to be installed in the separation chamber one by one and connected to the corresponding output terminals through wires, which is time-consuming and laborious. , it may also cause problems such as relatively loose structure of the separation chamber, complicated wiring, and easy damage; in addition, strip electrodes need to be fabricated one by one, and the process cost is relatively high.

In summary, there is at least one technical problem in the existing dust removal technology as follows:

In the existing purification technology, the high-voltage electrostatic dust removal equipment is complicated and consumes a lot of energy;

The mesh filter method is difficult to filter tiny particles, and the filter needs to be replaced regularly. There is a lot of waste of consumables, high cost, and inconvenient cleaning;

In dielectrophoresis dust removal technology, the structure and assembly process of dielectrophoresis electrodes are relatively complicated, which is not easy to clean and maintain.

Contents of the invention

The main purpose of the present invention is to provide a dielectrophoretic gas purification unit module and method based on high dielectric materials, so as to solve at least one technical problem in the background art.

In order to achieve the above object, according to one aspect of the present invention, a dielectrophoretic gas purification unit module based on high dielectric material is provided, including:

Dielectrophoretic electrode structure, the dielectrophoretic electrode structure includes a ring-shaped barrel electrode, a center electrode is provided at the axial position of the ring-shaped barrel-shaped electrode, support frames are provided at both ends of the ring-shaped barrel-shaped electrode, and the center electrode passes through The support frame is connected and fixed to the annular barrel-shaped electrode, and the annular barrel-shaped electrode, the support frame and the central electrode form a cavity structure, and the cavity structure is filled with high-dielectric ceramic spheres;

An AC power supply, one pole of the AC power supply is connected to the center electrode, and the other pole of the AC power supply is connected to the ring-shaped barrel electrode;

The diameter of the inner ring of the annular barrel-shaped electrode is 10-50mm;

The dielectric constant of the high dielectric ceramic sphere is 23000-34000, and the diameter is 2.3-2.8mm;

The frequency of the AC power supply is 800-5000 Hz, and the voltage of the AC power supply satisfies that the electric field strength between the central electrode and the ring-shaped barrel electrode is 200-3000 V/cm.

Preferably, the support frame is made of insulating ceramic or plastic, the support frame includes a first bracket and a second bracket, the first bracket has a first gap, and the second bracket has a second gap , the widths of the first gap and the second gap are both smaller than the diameter of the high dielectric ceramic sphere, and the first bracket and the second bracket are respectively blocked at both ends of the annular barrel-shaped electrode. The first slit and the second slit are provided on the support frame for ventilation, wherein the width of the first slit and the second slit is smaller than the diameter of the high dielectric ceramic sphere, and the purpose is to prevent the high dielectric ceramic sphere from rolling out of the slit.

Preferably, the annular barrel-shaped electrode adopts a metal tube structure, and the central electrode adopts a solid metal rod structure.

Preferably, the dielectrophoretic gas purification unit module further includes a connecting plate, on which several dielectrophoretic electrode structures are arranged, and the central electrode of each dielectrophoretic electrode structure is respectively connected to one pole of the AC power supply, The annular barrel-shaped electrode of each dielectrophoretic electrode structure is respectively connected to the other pole of the AC power supply. Several dielectrophoretic electrode structures are connected in parallel to form a gas purification module, that is, multiple dielectrophoretic electrode structures are installed on a connecting plate to form a module, and the two poles of the AC power supply are respectively connected to the center electrode of each dielectrophoretic electrode structure and the ring barrel electrode connection.

Preferably, a through hole is provided at the center of the support frame, and a central electrode is passed through the through hole. The purpose of setting the through hole in the support frame is to penetrate and fix the central electrode, and the support frame supports and fixes the central electrode through the through hole.

Preferably, a first terminal is welded on the annular barrel-shaped electrode, a second terminal is welded on the central electrode, and the first terminal and the second terminal are respectively connected to an AC power source through electrode leads. Preferably, the AC power supply is sinusoidal alternating current or pulsed alternating current, the frequency of the AC power supply is 800-5000 Hz, and the voltage of the AC power supply meets the requirement that the electric field strength between the central electrode and the ring-shaped barrel electrode is 200-3000V/cm (that is, satisfying The ratio of the voltage U of the AC power supply to the distance d between the central electrode and the annular barrel electrode is 200-3000V/cm).

Preferably, the connection plate is provided with several installation grooves, and the dielectrophoretic electrode structure is fixedly installed in the installation grooves. The purpose of providing the installation groove is to install and fix the DEP electrode structure. The number of installation slots is set according to the number of DEP electrode structures that need to be installed. A DEP electrode structure is inserted in each installation slot. Interference fit or thread fit can be used between the installation slot and DEP electrode structure connect.

Preferably, the connecting plate is provided with a slot, and a rubber plug is provided in the slot, and a connection lead wire is passed through the rubber plug, wherein the slot is used for inserting the rubber plug. The rubber plug is used to achieve close contact with the connecting lead, thereby ensuring the sealing when the connecting lead is passed through.

According to another aspect of the present invention, a kind of dielectrophoretic gas purification method based on high dielectric material is provided, comprising:

By connecting the center electrode and the ring-shaped barrel electrode to the two poles of the AC power supply, and adjusting the voltage and frequency of the AC power supply, a non-uniform electric field is formed between the center electrode and the ring-shaped barrel electrode; filling in the center electrode and the ring barrel The high-dielectric ceramic sphere with high dielectric constant between the electrodes is highly polarized, so that a large amount of induced charges are generated on the surface of the high-dielectric ceramic sphere; the electric field between the center electrode and the ring-shaped barrel electrode Under the action of the curved surface structure of the sphere, a large electric field gradient is formed in the gap area between the high dielectric ceramic balls, thereby effectively enhancing the dielectrophoretic force on the dust particles in the gas; the dust particles in the dielectrophoretic force Under the action, it moves to the outer wall of the high dielectric ceramic ball and is adsorbed on the surface of the high dielectric ceramic ball, so as to realize the efficient capture of dust particles in the air.

Compared with the prior art, the present invention has the following technical effects:

High-dielectric ceramic spheres, central electrodes, ring-shaped barrel electrodes, and support frames have simple and stable structures, and are easy to mass-produce in an industrialized manner;

The high dielectric ceramic sphere is filled between the center electrode and the ring electrode, which is easy to operate during filling and assembly; when it is necessary to clean each part, the high dielectric ceramic sphere can be taken out for cleaning and then filled, and there is no waste of consumables;

High-dielectric ceramic spheres have stable performance, high-dielectric ceramic spheres can be reused, and high-dielectric ceramic spheres are resistant to high temperatures and can purify high-temperature gases;

High air dust purification rate: due to the high dielectric constant of the high dielectric ceramic sphere, when it is in the non-uniform electric field formed by the central electrode and the ring-shaped barrel electrode, the high dielectric ceramic sphere is highly polarized, thus A large amount of induced charge is generated on the surface of the electroceramic sphere. The non-uniform electric field between the central electrode and the ring-shaped barrel electrode will change drastically under the action of the curved surface structure of the high-dielectric ceramic sphere, and a large electric field gradient will be formed in the gap area between the ceramic spheres, thereby effectively enhancing the dust particles. Received dielectrophoretic force, so as to achieve high-efficiency capture and purification of dust particles in the air;

In addition, the stacking of high-dielectric ceramic spheres between the central electrode and the ring-shaped barrel electrode will naturally form a gap between the spheres. The size of the gap is between 0.5-1.5mm, and the size of the gap is much larger than the gap of the filter screen. Size, so when the air is dust purified, the wind resistance can be significantly reduced. On the one hand, the power of the fan can be reduced, thereby reducing the noise of the purifier; on the other hand, the ventilation volume can be increased to improve the purification efficiency.

Description of drawings

The accompanying drawings constituting a part of the present application are used to provide a further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention. In the attached picture:

Fig. 1 shows the structural representation of the dielectrophoretic gas purification unit module based on high dielectric material according to the present invention;

Fig. 2 shows the front view of the dielectrophoretic gas purification unit module based on high dielectric material in Fig. 1;

Fig. 3 shows the left side view of the dielectrophoretic gas purification unit module based on high dielectric material in Fig. 1;

Fig. 4 shows the top view of the dielectrophoretic gas purification unit module based on high dielectric material in Fig. 1;

Fig. 5 shows the bottom view of the dielectrophoretic gas purification unit module based on high dielectric material in Fig. 1;

Fig. 6 shows the right side view of the dielectrophoretic gas purification unit module based on high dielectric material in Fig. 1;

Fig. 7 shows the high dielectric ceramic sphere filling view of the dielectrophoretic gas purification unit module based on high dielectric material in Fig. 1;

Fig. 8 shows the assembly structure view of the dielectrophoretic gas purification unit module based on high dielectric material in Fig. 1;

Fig. 9 shows a side view of the assembly structure of the dielectrophoretic gas purification unit module based on high dielectric material in Fig. 8;

Fig. 10 shows the front view of the assembly structure of the dielectrophoretic gas purification unit module based on high dielectric material in Fig. 8;

Fig. 11 shows the top view of the assembly structure of the dielectrophoretic gas purification unit module based on high dielectric material in Fig. 8;

FIG. 12 shows a bottom view of the assembly structure of the DEP gas purification unit module based on high dielectric material in FIG. 8 .

Wherein, the above-mentioned accompanying drawings include the following reference signs:

Center electrode 1; first slit 2; first support 3; ring-shaped barrel electrode 4; first terminal 5; second support 6; second terminal 7; second slit 8; connecting plate 9; first structure 10; second structure 11; third structure 12; fourth structure 13; rubber plug 14; installation groove 15;

Detailed ways

It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

As shown in FIGS. 1 to 7 , an embodiment of the present invention provides a dielectrophoretic gas purification unit module based on a high dielectric material, including a dielectrophoretic electrode structure and an AC power supply. The dielectrophoretic electrode structure includes a ring-shaped barrel electrode 4, the axis position of the ring-shaped barrel-shaped electrode 4 is provided with a central electrode 1, and two ends of the ring-shaped barrel-shaped electrode 4 are provided with support frames, and the center electrode 1 is supported by The frame is connected with the ring-shaped barrel electrode 4, and the ring-shaped barrel electrode 4, the support frame and the center electrode 1 form a cavity structure, and the cavity structure is filled with high-dielectric ceramic spheres 16; one pole of the AC power supply It is connected with the central electrode 1 , and the other pole of the AC power supply is connected with the ring-shaped barrel electrode 4 . The invention has scientific and reasonable structural design, good dielectrophoresis effect, simple structure, easy manufacture and installation, good dust removal effect, high efficiency, low cost, easy cleaning, long service life and the like. Dielectrophoresis purification is an important method for particle separation, which can realize solid-liquid separation and solid-gas separation.

The dielectrophoretic electrode structure is composed of a central electrode 1, an annular barrel-shaped electrode 4, a support frame, and a high-dielectric ceramic sphere 16, wherein the central electrode 1 is fixed to the annular barrel-shaped electrode through the support frames at both ends of the annular barrel-shaped electrode 4 4, the two poles of the AC power supply are respectively connected to the center electrode 1 and the annular barrel-shaped electrode 4.

Example 1

In this embodiment, the dielectrophoretic electrode structure includes an annular barrel-shaped electrode 4 , and a central electrode 1 is provided at the axial position of the annular barrel-shaped electrode 4 . The annular barrel-shaped electrode 4 adopts a copper tube structure, the center electrode 1 adopts a solid copper rod structure, the annular barrel-shaped electrode 4 is welded with a first terminal 5, the center electrode 1 is welded with a second terminal 7, and the first terminal 5 and the second terminal 7 are respectively connected to an AC power source through electrode leads. Wherein, the diameter of the central electrode 1 is 1-3 mm, the diameter of the inner ring of the annular barrel-shaped electrode 4 is 10-50 mm, and the height is 20-1000 mm. Preferably, in this embodiment, the inner diameter of the copper tube structure is 30 mm, the length of the copper tube structure is 150 mm, the center electrode 1 is a solid copper rod structure with a diameter of 4 mm, and the length of the center electrode 1 is 180 mm.

In this embodiment, a support frame is provided at both ends of the annular barrel-shaped electrode 4, and the center electrode 1 is connected with the annular barrel-shaped electrode 4 through the support frame. The electrodes 4 are connected; the support frame includes a first support 3 and a second support 6, the first support 3 has a first slit 2, the second support 6 has a second slit 8, and the first slit 2 and the second slit 8 The shape is one or a combination of strips and holes, and the widths of the first slit 2 and the second slit 8 are smaller than the diameter of the high-dielectric ceramic ball 16, which means that the high-dielectric ceramic ball 16 will not dislodge from the second slit. The first slot 2 and the second slot 8 pass through. Preferably, on the premise of meeting the requirement of support strength, the area of the gap should be increased to increase the flow rate of gas. In this embodiment, the gap accounts for 85-88% of the cross-sectional area of the support frame; a through hole is provided at the center of the support frame, and the center electrode 1 is pierced in the through hole. When the center electrode 1 adopts a 4mm copper rod structure, the diameter of the through hole 4mm is used. The first bracket 3 and the second bracket 6 are respectively used to block the two ends of the annular barrel-shaped electrode 4 and support and fix the center electrode 1 to prevent the high dielectric ceramic ball 16 from rolling out of the cavity structure.

In this embodiment, the ring-shaped barrel-shaped electrode 4, the support frame and the central electrode 1 form a cavity structure, and the cavity structure is filled with high-dielectric ceramic spheres 16. The dielectric constant of the high-dielectric ceramic sphere 16 is greater than 8000, and the high-dielectric ceramic sphere 16 The diameter of the electric ceramic sphere 16 is 1-4 mm, and the sphericity of the high dielectric ceramic sphere 16 is greater than 85%, that is, the ratio of the minimum diameter to the maximum diameter is greater than 85%. The high-dielectric ceramic sphere 16 is the core structure of dielectrophoresis. After filling the ring-shaped barrel electrode 4, the first support frame 3, the second support frame 6 and the center electrode 1 to form a cavity structure, the high-dielectric ceramic sphere 16 The intercommunication gap is formed by natural accumulation between them, the gap size can reach millimeter level, the gas permeability is high, and the wind resistance is small when purifying the gas; in addition, the high dielectric ceramic sphere 16 has a high dielectric constant, when it is in the center electrode 1 and the ring-shaped barrel-shaped electrode 4 form an electric field, the high-dielectric ceramic sphere 16 is highly polarized and a large amount of induced charges are generated on the surface of the high-dielectric ceramic sphere 16, and the original electric field intensity changes drastically under the action of the curved surface of the ceramic ball. A huge electric field gradient is formed in the gap area between the ceramic spheres, and the electric field gradient is enhanced to enhance the dielectrophoretic force, thereby achieving high-efficiency capture of dust particles in the air. Preferably, the ceramic powder prepared by Y and Nb doped TiO ₂ is used as the main raw material in this embodiment, and the high dielectric ceramic sphere 16 required by this embodiment is obtained through molding and sintering, and the obtained high dielectric ceramic sphere 16 is obtained at 1600 The dielectric constant at the frequency of -3200Hz is between 23000-34000, the obtained high dielectric ceramic sphere 16 has a diameter between 2.3-2.5mm, and the sphericity is greater than 90%.

In this embodiment, one pole of the AC power is connected to the central electrode 1 , and the other pole of the AC power is connected to the ring-shaped barrel electrode 4 , and the AC power is sinusoidal or pulsed.

The assembly steps of the dielectrophoresis purification module in this embodiment are as follows: first, the second bracket 6 is installed on one end of the annular barrel-shaped electrode 4, and then the center electrode 1 is inserted into the through hole of the second bracket 6, and the center electrode 1 is two Both ends protrude from the end of the ring-shaped barrel-shaped electrode 4, and then the second support 6 is placed downward to make the ring-shaped barrel-shaped electrode 4 vertically fixed, and the high-dielectric ceramic ball 16 is filled into the center electrode 1 and the ring-shaped electrode 1 from one end of the first support 3. In the cavity structure formed by the electrode and the support frame, until it is filled; then the first bracket 3 is installed, so that the center electrode 1 passes through the through hole of the first bracket 3, so that the positions of the center electrode 1 and the ring-shaped barrel electrode 4 are fixed; Then the second terminal 7 is welded on the central electrode 1, and the first terminal 5 is welded on the annular barrel electrode 4; finally, the first terminal 5 and the second terminal 7 are respectively connected to an AC power source through electrode leads. In this embodiment, in order to avoid electric shock and leakage problems, in this embodiment, the part of the annular barrel electrode 4 and the central electrode 1 protruding from the annular electrode 4 and the solder joints of the electrode leads are insulated to ensure electrical safety.

In order to test the effect, the above assembled dielectrophoresis purification module is placed in the ventilation pipe, and the gap between the inner wall of the ventilation pipe and the edge of the barrel electrode 4 is filled with cement; one side of the ventilation pipe is installed with a blower, and the end of the blower is the air inlet. The other end is the air outlet, and then the content of dust particles is observed at the air inlet and the air outlet respectively. Experimental conditions: the waveform of the AC power supply is sinusoidal AC or pulsed AC, the frequency of the AC power is 800-5000Hz, and the voltage of the AC power is such that the electric field strength of the center electrode 1 and the ring-shaped barrel electrode 4 is 200-3000V/cm (ie The ratio of the voltage U of the AC power supply to the distance d between the central electrode 1 and the ring-shaped barrel electrode 4 is 200-3000V/cm).

Specifically, the input voltage of the AC power supply in Example 1 is 1500V, and the annular barrel-shaped electrode 4 adopts a copper tube structure with an inner diameter of 30mm, and the length of the copper tube structure is 150mm; the center electrode 1 adopts a solid copper rod with a diameter of 4mm structure, the length is 180mm; the support frame is made of insulating plastic into a bottle cap shape, with an inner diameter of 30mm, which can just cover the two ends of the ring-shaped barrel-shaped electrode 4. At the same time, a 4mm through hole is punched in the center of the bottom surface of the support frame. It can be penetrated and fixed, and at the same time, the bottom surface is opened into an array-type opening mesh structure. In this embodiment, the diameter of the high-dielectric ceramic is 2.3-2.5 mm, and the maximum size of the opening gap of the support frame is 1.8 mm. In addition, in order to illustrate the impact of the size of the ring-shaped barrel-shaped electrode 4 on the purification effect, a copper tube structure with a diameter of 60 mm was selected as the ring-shaped barrel-shaped electrode 4 as Comparative Example 1; The matching central electrode 1 and supporting frame were prepared with the same materials and other corresponding parameters; when performing the purification effect test, the input parameters of the AC power supply in Comparative Example 1 were the same as those in Example 1. The test results are shown in Table 1.

Table 1 embodiment 1 and comparative example 1 test result

It can be concluded from Table 1 that the purification effect of Example 1 for PM2.5 and larger PM5.0 is 100%, and the purification rate for smaller PM0.5 is also above 99.7%, which can illustrate this implementation The technical solution of Example 1 can achieve super-purification effect on dust particles in the air. In addition, it can be seen from the results of Comparative Example 1 that when the diameter of the annular barrel-shaped electrode 4 is increased to 60mm, although the high-dielectric ceramic ball 16 of the same dielectric constant level is used, the dust purification effect is remarkable. For example, the purification rate for PM2.5 dust is only 62.2%, while the purification rate for PM0.5 finer dust is even lower, only 17.4%. The test results of Example 1 and Comparative Example 1 show that in order to achieve a better purification effect, the diameter of the ring-shaped barrel-shaped electrode needs to meet specific size requirements.

Embodiment 2, comparative example 2 and comparative example 3

In order to further illustrate the beneficial effects of the technical solution of the present invention, it will be described below in conjunction with Example 2; simultaneously, in order to prove that the diameter size of the high dielectric ceramic ball 16 and the dielectric constant of the ceramic ball matrix in the technology of the present invention are within the range of the dielectric constant The key role played in the purification of the electrophoretic electrode structure will be described in conjunction with Comparative Example 2 (changing the diameter of the high dielectric ceramic ball) and Comparative Example 3 (changing the dielectric constant of the high dielectric ceramic ball 16 ).

On the basis of Example 1, Embodiment 2, Comparative Example 2 and Comparative Example 3 adopt the same center electrode 1 and annular barrel-shaped electrode 4 sizes, that is, the annular barrel-shaped electrode 4 adopts a copper tube with an inner diameter of 30mm, and the length of the copper tube is The center electrode 1 adopts a solid copper rod structure with a diameter of 4mm and a length of 180mm; the support frame is made of insulating plastic into a bottle cap shape with an inner diameter of 30mm, which can just cover the two ends of the ring-shaped copper tube electrode, while the support frame The middle gap accounts for 85-88% of the cross-sectional area of the support frame, and a 4mm through hole is punched in the center of the support frame.

Preferably, in Example 2, pure calcium copper titanium oxide (CaCu ₃ Ti ₄ O ₁₂ , CCTO for short) ceramic powder is used to prepare high dielectric ceramic spheres 16 with a diameter of 2.5-2.8mm, and the resulting high dielectric ceramic The dielectric constant of the sphere 16 substrate in the frequency range of 1000-3000Hz is 24500-27890; Comparative Example 2 also uses the same CCTO ceramic powder to prepare the high-dielectric ceramic sphere 16, but the diameter of the high-dielectric ceramic sphere 16 is 4.8-5.0mm ; Comparative Example 3 adopts CCTO-15%Al ₂ O ₃ mixed powder to prepare 2.5-2.8mm high dielectric ceramic sphere 16, the dielectric constant of the gained high dielectric ceramic sphere 16 in the frequency range of 1000-3000Hz is 5500-7630 . Put the above three kinds of high dielectric ceramic spheres 16 into the cavity structure surrounded by the center electrode 1, the ring-shaped barrel electrode 4 and the support frame respectively to form a dielectrophoretic electrode structure, and then connect the center electrode 1 and the ring electrode Through the AC power supply, the original voltage of the AC power supply is adjusted to 1200-1600V, and the frequency is between 1300-2800Hz. When carrying out purification effect test to embodiment 2, comparative example 2 and comparative example 3, adopt the same test method as embodiment 1, test result is shown in table 2.

Table 2 embodiment 2, comparative example 2 and comparative example 3 test results

It can be seen from the results in Table 2 that in Example 2, when the high dielectric ceramic sphere 16 has a size of 2.5-2.8mm and a dielectric constant of 24500-27890, the purification effect is remarkable, and the purification rate for PM2.5 can reach 100%. and in Comparative Example 2, when the size of the high dielectric ceramic sphere 16 was larger (4.8-5.0mm), the purification effect was not ideal, and the purification rate to PM2.5 was 78.6%; in addition, from Comparative Example 3, it can be seen that , when the dielectric constant of the high-dielectric ceramic ball 16 is less than 5500-7630, although the diameter of the ceramic ball 16 is the same as that of Example 2, it obviously deteriorates the dust purification rate, as the purification rate for PM2.5 is only The purification rate for PM0.5 and PM1.0 is even lower, only 21.4% and 31.6%. Thus, the comprehensive results of Example 2 and Comparative Example 2 can prove that when the high dielectric ceramic ball 16 has a higher dielectric constant (between 24500-27890), the size of the high dielectric ceramic ball 16 is an important factor affecting the purification rate. In addition, the comprehensive test results of Example 2 and Comparative Example 3 show that when the high dielectric ceramic ball adopts a suitable diameter size, the dielectric constant of the ceramic ball matrix is also very important to the purification rate. From the principle of realizing the beneficial effect in the technical scheme of the present invention, it can be seen that the higher the dielectric constant of the high dielectric ceramic ball 16 substrate, the higher the polarization intensity of the high dielectric ceramic ball 16 in the electric field, and the gap between the ceramic balls The stronger the electric field gradient corresponding to the area, the stronger the dielectrophoretic force on the dust and enhance the purification effect. Therefore, in order to achieve a high-quality purification effect, the dielectric constant of the high-dielectric ceramic ball 16 needs to reach a certain value.

Example 3

According to the content of the present invention, another dielectrophoretic gas purification unit module based on high dielectric material is also provided, which will be described in conjunction with Embodiment 3 below.

Referring to Fig. 8-Fig. 12, in this embodiment 3, a dielectrophoretic gas purification unit module based on a high dielectric material further includes a connecting plate 9 on which several dielectrophoretic electrode structures are arranged. In this embodiment, four DEP electrode structures are used, but not limited to four, which are the first structure body 10 , the second structure body 11 , the third structure body 12 and the fourth structure body 13 . The central electrode 1 of each DEP electrode structure is respectively connected to one pole of the AC power supply, and the annular barrel-shaped electrode 4 of each DEP electrode structure is respectively connected to the other pole of the AC power supply. The connecting plate 9 is provided with a number of mounting grooves 15, through which the dielectrophoretic electrode structure is fixedly installed in the mounting grooves 15, wherein the connecting plate 9 is also provided with a slot, and a rubber plug 14 is arranged in the slot, and the rubber plug 14 can be worn Connecting leads are set, and several DEP electrode structures are connected in parallel to form a gas purification module, that is, a plurality of DEP electrode structures are installed on a connecting plate 9 to form a module, and the two poles of the AC power supply are respectively connected to the center electrode of each DEP. 1 is connected to the ring-shaped barrel electrode 4. In order to detect the purification effect of the dielectrophoresis gas purification unit module in Example 3, the same method as in Example 1 and Example 2 is adopted, the dielectrophoresis gas purification unit module is placed in the pipeline, and the gas circulation is realized by a fan , adjust the frequency of the AC power supply to 800-4800Hz, and the voltage to 200-2800V, then test the particle content of the air inlet and air outlet respectively and calculate the purification rate. The test results are: the purification rate of PM0.5 and PM1.0 is between 92.4%-99.7%; the purification rate of PM2.5 is 99.9-100%.

From the above description, it can be seen that the above-mentioned embodiments of the present invention have achieved the following technical effects:

The high dielectric ceramic sphere 16, the central electrode 1, the ring-shaped barrel electrode 4, and the support frame have a simple and stable structure, and are easy to industrialized mass production;

The high dielectric ceramic sphere 16 is filled between the center electrode 1 and the ring-shaped barrel electrode 4, which is easy to operate during filling and assembly; when it is necessary to clean each part, the high dielectric ceramic sphere 16 can be taken out for cleaning and then filled. There is no waste of consumables;

The performance of the high-dielectric ceramic sphere 16 is stable, the high-dielectric ceramic sphere 16 can be reused, and the high-dielectric ceramic sphere 16 is resistant to high temperature, and can be used for gas purification at high temperature;

The air dust purification effect is good, and the purification rate of PM2.5 can reach 100%;

In the purification unit, the high-dielectric ceramic spheres 16 are piled up to form a gap naturally. The gap size is between 0.5-1.5mm, and the gap size is much larger than the filter screen. Small wind resistance, on the one hand, can reduce the power of the fan, thereby reducing the noise of the purifier; on the other hand, it can increase the ventilation volume, and increase the purification efficiency.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. A dielectrophoretic gas purification unit module based on high dielectric material, characterized in that, comprising: Dielectrophoretic electrode structure, the dielectrophoretic electrode structure includes a ring-shaped barrel electrode, a center electrode is provided at the axial position of the ring-shaped barrel-shaped electrode, support frames are provided at both ends of the ring-shaped barrel-shaped electrode, and the center electrode passes through The support frame is connected and fixed with the annular barrel-shaped electrode, and the annular barrel-shaped electrode, the support frame and the central electrode form a cavity structure, and the cavity structure is filled with high-dielectric ceramic spheres; An AC power supply, one pole of the AC power supply is connected to the center electrode, and the other pole of the AC power supply is connected to the ring-shaped barrel electrode; The diameter of the inner ring of the annular barrel-shaped electrode is 10-50mm; The dielectric constant of the high dielectric ceramic sphere is 23000-34000, and the diameter is 2.3-2.8mm; The frequency of the AC power supply is 800-5000 Hz, and the voltage of the AC power supply satisfies that the electric field strength between the central electrode and the ring-shaped barrel electrode is 200-3000 V/cm. 2. the dielectrophoretic gas purification unit module based on high dielectric material as claimed in claim 1, is characterized in that, described support frame adopts insulating material, and described support frame comprises a first support and a second support, and described The first bracket has a first gap, and the second bracket has a second gap, and the widths of the first gap and the second gap are both smaller than the diameter of the high dielectric ceramic sphere. 3 . The dielectrophoretic gas purification unit module based on high dielectric material according to claim 1 , wherein the annular barrel-shaped electrode adopts a metal tube structure, and the central electrode adopts a solid metal rod structure. 4 . 4. the dielectrophoretic gas purification unit module based on high dielectric material as claimed in claim 1, is characterized in that, also comprises connecting plate, and described connecting plate is provided with several dielectrophoretic electrode structures, each dielectric The central electrode of the electrophoretic electrode structure is respectively connected to one pole of the AC power supply, and the annular barrel-shaped electrode of each DEP electrode structure is respectively connected to the other pole of the AC power supply. 5 . The dielectrophoretic gas purification unit module based on high dielectric material according to claim 1 , wherein a through hole is provided at the center of the support frame, and a central electrode is penetrated in the through hole. 6 . 6. The dielectrophoretic gas purification unit module based on high dielectric material as claimed in claim 1, wherein a first terminal is welded on the annular barrel electrode, and a second terminal is welded on the central electrode. A connection terminal, the first connection terminal and the second connection terminal are respectively connected to an AC power supply through electrode leads. 7 . The dielectrophoretic gas purification unit module based on high dielectric material according to claim 1 , wherein the AC power supply is sinusoidal AC or pulsed AC. 8 . 8. the dielectrophoresis gas purification unit module based on high dielectric material as claimed in claim 4, is characterized in that, described connecting plate is provided with some installation grooves, and the dielectrophoresis electrode structure is fixedly installed in the described installation grooves . 9. The dielectrophoretic gas purification unit module based on high dielectric material as claimed in claim 4, wherein a slot is provided on the connecting plate, a rubber plug is provided in the slot, and the rubber Connecting lead wires are passed through the plug. 10. A dielectrophoretic gas purification method based on a high dielectric material, based on the dielectrophoretic gas purification unit module based on a high dielectric material according to any one of claims 1-9, characterized in that it comprises: Connect the two poles of the AC power supply to the center electrode and the ring-shaped barrel electrode respectively, generate a non-uniform electric field between the center electrode and the ring-shaped barrel electrode, and fill the gap between the center electrode and the ring-shaped barrel electrode with a high dielectric constant. The high-dielectric ceramic sphere is highly polarized, and a large amount of induced charges are generated on the surface of the high-dielectric ceramic sphere. The gap area between the ceramic balls forms a huge electric field gradient, which enhances the dielectrophoretic force on the dust particles. Under the action of the dielectrophoretic force, the dust particles move towards the high dielectric ceramic ball and are adsorbed on the The surface achieves efficient capture of dust particles in the air.

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