CN116392964A - Dielectrophoresis gas purification unit module and method based on high dielectric material - Google Patents
Dielectrophoresis gas purification unit module and method based on high dielectric material Download PDFInfo
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- B01D57/00—Separation, other than separation of solids, not fully covered by a single other group or subclass, e.g. B03C
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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
Technical Field
The invention relates to the technical field of energy conservation, environmental protection and solid separation from fluid, in particular to a dielectrophoresis gas purification unit module and a dielectrophoresis gas purification method based on a high dielectric material.
Background
In order to achieve lower concentration dust pollutant emissions, businesses need better performing dust removal equipment. At present, dust removing devices for purifying dust particles in air are various, including mechanical dust removers, electric dust removers, wet dust removers and filter dust removers, but the dust removers are mainly used for treating larger dust in the air, and the existing dust removing devices are poor in dust removing effect and not negligible in content of the tiny dust in air pollution, so that the dust removing devices are an important cause of haze formation.
The existing air purification technology comprises the following steps: adsorption technology, negative (positive) ion technology, catalysis technology, photocatalyst technology, super-structure photo-mineralization technology, HEPA high-efficiency filtration technology, electrostatic dust collection technology and the like. In any of the technologies, many of the technologies have the problems of complex structure, troublesome and complex manufacture, high cost, short service life of main components, frequent replacement of the components, increased cost and the like. For example, in some filter screen type filtering dust removing technologies, the extremely fine and micro particles may leak out of the screen, the dust removing effect is not ideal, and the filter screen needs to be replaced frequently; the electrostatic dust-removing method is characterized by that it utilizes high-voltage direct-current electric field to produce a large quantity of electrons and ions, then makes them move toward two poles under the action of electric field force, and makes the dust particles in the air flow touch them to make them charge, and makes the charged particles move toward polar plate under the action of electric field force so as to implement separation of solid particles or liquid particles and air flow.
Unlike the tubular electrostatic precipitator and the plate-type electrostatic precipitator widely used in the industry at present, the dielectrophoresis technology has different characteristics:
first, dielectrophoresis techniques manipulate neutral particles to produce translational motion due to dielectric polarization; the electrostatic dust collection technology is operated by electrons and ions, so that dust particles are loaded and then directionally move.
Secondly, the movement direction of particles in the dielectrophoresis technology is irrelevant to the direction of an electric field and is only relevant to the dielectric constant of the particles and the dielectric constant of a medium; in the electrostatic dust collection technology, the movement direction of the particles depends on the charged sign of the particles and the direction of an electric field, and the direction of the electric field is reversed, so that the movement direction is reversed.
Furthermore, non-uniform electric fields are required in dielectrophoresis techniques; while electrostatic precipitation techniques require a uniform or non-uniform dc electric field.
In addition, the adsorption force of dust in the dielectrophoresis technology is derived from dielectrophoresis force, and the size of the dielectrophoresis force is proportional to the cube of the particle diameter and the square of the electric field gradient; the electrostatic force of the dust in the electrostatic dust removing technology is proportional to the charge of the particles, so that the dust removing effect is directly related to the charge of the dust particles.
In the prior art of dielectrophoresis dust removal, patent application No. 201410407467.8 discloses a dielectrophoresis electrode structure, and proposes a dielectrophoresis electrode structure, which includes a first wire group arranged in parallel or approximately parallel along a first direction, a second wire group arranged in parallel or approximately parallel along a second direction, insulating layers outside wires in the first wire group and the second wire group, the first direction and the second direction are not parallel, wires in the first wire group and the second wire group are interwoven together, a part of wires in the first wire group and the second wire group are connected with a positive electrode of a power supply, and the other part of wires in the first wire group and the second wire group are connected with a negative electrode of the power supply. In addition, the dielectrophoresis electrodes adopted in the technology are in independent strips and are connected with corresponding output ends of an alternating current power supply through wires, and the dielectrophoresis electrodes are required to be arranged in the separation chamber one by one and are connected with the corresponding output ends through wires respectively, so that the problems of time and labor waste, loose structure of the separation chamber, complex wiring and easiness in damage are caused; besides, the strip-shaped electrodes also need to be manufactured one by one, and the process cost is high.
In summary, the existing dust removal technology has at least one of the following technical problems:
in the prior purifying technology, high-voltage electrostatic dust collection equipment is complex and has high energy consumption;
the net type filtering method is difficult to filter tiny particles, the filter screen needs to be replaced regularly, and the problems of waste of a large amount of consumables, high cost and inconvenience in cleaning exist;
in the dielectrophoresis dust-removing technology, the dielectrophoresis electrode structure and the manufacturing and assembling process are relatively complex, and the dielectrophoresis electrode structure is inconvenient to clean and maintain.
Disclosure of Invention
The invention mainly aims to provide a dielectrophoresis gas purification unit module and a dielectrophoresis gas purification method based on a high dielectric material, 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, there is provided a dielectrophoresis gas purification unit module based on a high dielectric material, including:
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 fixedly 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;
an alternating current power supply, wherein 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 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 alternating current power supply is 800-5000Hz, and the voltage of the alternating current power supply meets the electric field strength between the central electrode and the annular barrel-shaped electrode of 200-3000V/cm.
Preferably, the support frame is made of insulating ceramic or plastic, the support frame comprises a first support and a second support, a first gap is formed in the first support, a second gap is formed in the second support, the widths of the first gap and the second gap are smaller than the diameter of the high-dielectric ceramic sphere, and the first support and the second support are respectively plugged at two ends of the annular barrel-shaped electrode. The first gap and the second gap are arranged on the supporting frame for ventilation, wherein the width of the first gap and the width of the second gap are 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 gap.
Preferably, the annular barrel-shaped electrode adopts a metal tube structure, and the central electrode adopts a solid metal rod structure.
Preferably, the dielectrophoresis gas purification unit module further comprises a connecting plate, a plurality of dielectrophoresis electrode structures are arranged on the connecting plate, the central electrode of each dielectrophoresis electrode structure is respectively connected with one pole of an alternating current power supply, and the annular barrel-shaped electrode of each dielectrophoresis electrode structure is respectively connected with the other pole of the alternating current power supply. The plurality of dielectrophoresis electrode structures are connected in parallel to form a gas purification module, namely, the plurality of dielectrophoresis electrode structures are arranged on a connecting plate to form a module, and two poles of an alternating current power supply are respectively connected with the central electrode of each dielectrophoresis electrode structure and the annular barrel-shaped electrode.
Preferably, a through hole is formed in the center of the support frame, and a center electrode is arranged in the through hole in a penetrating mode. The purpose of providing the through-hole in the support frame is to wear to establish and fix the center electrode, and the support frame supports and fixes the center electrode through the through-hole.
Preferably, a first wiring terminal is welded on the annular barrel-shaped electrode, a second wiring terminal is welded on the central electrode, and the first wiring terminal and the second wiring terminal are respectively connected with an alternating current power supply through electrode leads. Preferably, the alternating current power supply is sinusoidal alternating current or pulse alternating current, the frequency of the alternating current power supply is 800-5000Hz, the voltage of the alternating current power supply meets the electric field strength between the central electrode and the annular barrel electrode to be 200-3000V/cm (namely, the ratio of the voltage U of the alternating current power supply to the distance d between the central electrode and the annular barrel electrode to be 200-3000V/cm).
Preferably, the connecting plate is provided with a plurality of mounting grooves, and the dielectrophoresis electrode structure is fixedly arranged in the mounting grooves. The purpose of the mounting groove is to mount and fix the dielectrophoresis electrode structure. The number of the mounting grooves is set according to the number of the dielectrophoresis electrode structures which are required to be set, one dielectrophoresis electrode structure is inserted in each mounting groove, and the mounting grooves and the dielectrophoresis electrode structures can be connected through interference fit or screw fit.
Preferably, the connecting plate is provided with a slot, a rubber plug is arranged in the slot, and a connecting lead wire is arranged in the rubber plug in a penetrating way, wherein the slot is used for inserting the rubber plug. The rubber plug is used for realizing close contact with the connecting lead, so that the tightness of the connecting lead when penetrating is guaranteed.
According to another aspect of the present invention, there is provided a dielectrophoresis gas purification method based on a high dielectric material, including:
the central electrode and the annular barrel electrode are respectively connected to two poles of an alternating current power supply, and the voltage and the frequency of the alternating current power supply are regulated, so that a non-uniform electric field is formed between the central electrode and the annular barrel electrode; the high dielectric ceramic sphere having a high dielectric constant filled between the center electrode and the annular barrel electrode is highly polarized, thereby generating a large amount of induced charges on the surface of the high dielectric ceramic sphere; the electric field between the central electrode and the annular barrel-shaped electrode is changed drastically under the action of the curved surface structure of the high-dielectric ceramic sphere to form a great electric field gradient in the gap area between the high-dielectric ceramic spheres, so that the dielectrophoresis force on dust particles in the gas is effectively enhanced; the dust particles move to the outer wall of the high-dielectric ceramic ball under the action of dielectrophoresis force and are adsorbed on the surface of the high-dielectric ceramic ball, so that the dust particles in the air are efficiently captured.
Compared with the prior art, the invention has the following technical effects:
the high dielectric ceramic sphere, the central electrode, the annular barrel-shaped electrode and the supporting frame have simple and stable structures, and are easy for industrialized batch production;
the high dielectric ceramic sphere is filled between the central electrode and the annular electrode, and the filling assembly is easy to operate; when each part needs to be cleaned, the high dielectric ceramic sphere can be taken out for cleaning and then filled, so that no consumable waste exists;
the high-dielectric ceramic sphere has stable performance, can be reused, is high-temperature resistant and can purify high-temperature gas;
the air dust purification rate is high: since the high dielectric ceramic sphere has a high dielectric constant, the high dielectric ceramic sphere is highly polarized when being in a non-uniform electric field formed by the center electrode and the annular barrel electrode, thereby generating a large amount of induced charges on the surface of the high dielectric ceramic sphere. The non-uniform electric field between the central electrode and the annular barrel-shaped electrode is changed drastically under the action of the curved surface structure of the high-dielectric ceramic sphere to form a great electric field gradient in the gap area between the ceramic spheres, so that the dielectrophoresis force suffered by dust particles is effectively enhanced, and the high-efficiency capturing and purifying of the dust particles in the air is realized;
in addition, the high dielectric ceramic spheres between the central electrode and the annular barrel-shaped electrode are mutually piled to form gaps naturally between the spheres, the gap size is 0.5-1.5mm, and the gap size is far larger than that of a filter screen, so that when dust purification is carried out on air, the wind resistance can be obviously reduced, on one hand, the power of a fan can be reduced, and the noise of a purifier is reduced; on the other hand, the ventilation quantity can be increased to improve the purification efficiency.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
fig. 1 shows a schematic structure of a dielectrophoresis gas purification unit module based on a high dielectric material according to the present invention;
fig. 2 shows a front view of the dielectrophoresis gas purification unit module of fig. 1 based on a high dielectric material;
FIG. 3 shows a left side view of the dielectrophoresis gas purification unit module of FIG. 1 based on a high dielectric material;
FIG. 4 shows a top view of the dielectrophoresis gas purification unit module of FIG. 1 based on a high dielectric material;
fig. 5 shows a bottom view of the dielectrophoresis gas purification unit module of fig. 1 based on a high dielectric material;
fig. 6 shows a right side view of the dielectrophoresis gas purification unit module of fig. 1 based on a high dielectric material;
FIG. 7 shows a high dielectric ceramic sphere fill view of the high dielectric material based dielectrophoresis gas purification unit module of FIG. 1;
fig. 8 is an assembled structural view of the dielectrophoresis gas purification unit module based on a high dielectric material of fig. 1;
FIG. 9 shows a side view of an assembled structure of the dielectrophoresis gas purification unit module of FIG. 8 based on a high dielectric material;
fig. 10 is a front view showing an assembled structure of the dielectrophoresis gas purification unit module based on the high dielectric material of fig. 8;
FIG. 11 shows a top view of an assembled structure of the dielectrophoresis gas purification unit module of FIG. 8 based on a high dielectric material;
fig. 12 is a bottom view showing an assembled structure of the dielectrophoresis gas purification unit module of fig. 8 based on a high dielectric material.
Wherein the above figures include the following reference numerals:
a center electrode 1; a first slit 2; a first bracket 3; an annular barrel electrode 4; a first terminal 5; a second bracket 6; a second terminal 7; a second slit 8; a connection plate 9; a first structure 10; a second structure 11; a third structure 12; a fourth structural body 13; a rubber stopper 14; a mounting groove 15; high dielectric ceramic spheres 16.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
As shown in fig. 1 to 7, an embodiment of the present invention provides a dielectrophoresis gas purification unit module based on a high dielectric material, including a dielectrophoresis electrode structure and an ac power source. The dielectrophoresis electrode structure comprises an annular barrel-shaped electrode 4, a central electrode 1 is arranged at the axial position of the annular barrel-shaped electrode 4, supporting frames are arranged at two ends of the annular barrel-shaped electrode 4, the central electrode 1 is connected with the annular barrel-shaped electrode 4 through the supporting frames, the annular barrel-shaped electrode 4, the supporting frames and the central electrode 1 form a cavity structure, and high-dielectric ceramic spheres 16 are filled in the cavity structure; one pole of the alternating current power supply is connected with the central electrode 1, and the other pole of the alternating current power supply is connected with the annular barrel-shaped electrode 4. The invention has the characteristics of 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 separating particles, and can realize solid-liquid separation and solid-gas separation.
The dielectrophoresis electrode structure comprises a central electrode 1, an annular barrel-shaped electrode 4, a supporting frame and a high-dielectric ceramic sphere 16, wherein the central electrode 1 is fixed at the axial central position of the annular barrel-shaped electrode 4 through the supporting frames positioned at the two ends of the annular barrel-shaped electrode 4, and two poles of an alternating current power supply are respectively connected with the central electrode 1 and the annular barrel-shaped electrode 4.
Example 1
In this embodiment, the dielectrophoresis electrode structure includes an annular barrel electrode 4, and a central electrode 1 is disposed at the axial position of the annular barrel electrode 4. The annular barrel-shaped electrode 4 adopts a copper pipe structure, the central electrode 1 adopts a solid copper bar structure, the annular barrel-shaped electrode 4 is welded with a first wiring terminal 5, the central electrode 1 is welded with a second wiring terminal 7, and the first wiring terminal 5 and the second wiring terminal 7 are respectively connected with an alternating current power supply through electrode leads. Wherein the diameter of the central electrode 1 is 1-3mm, the diameter of the inner ring of the annular barrel-shaped electrode 4 is 10-50mm, and the height is 20-1000mm. Preferably, in this embodiment, the inner diameter of the copper tube structure is 30mm, the length of the copper tube structure is 150mm, the central electrode 1 adopts a solid copper bar structure with the diameter of 4mm, and the length of the central electrode 1 is 180mm.
In the embodiment, the two ends of the annular barrel-shaped electrode 4 are provided with the supporting frames, the central electrode 1 is connected with the annular barrel-shaped electrode 4 through the supporting frames, the supporting frames are made of insulating materials, are made into a bottle cap shape, and can be connected with the annular barrel-shaped electrode 4 through threads; the support frame comprises a first support 3 and a second support 6, wherein the first support 3 is provided with a first gap 2, the second support 6 is provided with a second gap 8, the shapes of the first gap 2 and the second gap 8 are one or a combination of strip shapes and hole shapes, and the widths of the first gap 2 and the second gap 8 are smaller than the diameter of the high dielectric ceramic sphere 16, so that the high dielectric ceramic sphere 16 cannot pass through the first gap 2 and the second gap 8. Preferably, the area of the gap should be increased to increase the gas throughput while satisfying the support strength requirement. In the embodiment, the gap occupies 85-88% of the cross-sectional area of the support frame; the support frame central point puts and is equipped with the through-hole, wears to establish center electrode 1 in the through-hole, and when center electrode 1 adopted 4mm bar copper structure, the through-hole diameter adopted 4mm. Wherein the first bracket 3 and the second bracket 6 are respectively used for blocking the two ends of the annular barrel-shaped electrode 4 and supporting and fixing the central electrode 1 to prevent the high dielectric ceramic sphere 16 from rolling out of the cavity structure.
In this embodiment, the annular barrel-shaped electrode 4, the support frame and the central electrode 1 form a cavity structure, the cavity structure is filled with the high dielectric ceramic sphere 16, the dielectric constant of the high dielectric ceramic sphere 16 is greater than 8000, the diameter of the high dielectric ceramic sphere 16 is 1-4mm, the sphericity of the high dielectric ceramic sphere 16 is greater than 85%, i.e. the ratio of the minimum diameter to the maximum diameter is greater than 85%. The high dielectric ceramic spheres 16 are core structures of dielectrophoresis, and after the hollow structures are formed by the annular barrel-shaped electrode 4, the first support frame 3, the second support frame 6 and the central electrode 1, the high dielectric ceramic spheres 16 are naturally stacked to form intercommunicated gaps, the size of the gaps can reach millimeter level, the gas permeability is high, and the wind resistance is small when the gas is purified; in addition, the high dielectric ceramic sphere 16 has a high dielectric constant, when the high dielectric ceramic sphere 16 is in an electric field formed by the central electrode 1 and the annular barrel-shaped electrode 4, the high dielectric ceramic sphere 16 is highly polarized to generate a large amount of induced charges on the surface of the high dielectric ceramic sphere 16, the original electric field strength is changed drastically under the action of the curved surface of the ceramic sphere to form a great electric field gradient in the gap area between the ceramic spheres, and the electric field gradient increasesThe dielectrophoresis force is enhanced, and further high-efficiency capturing of dust particles in the air is achieved. Preferably, the present embodiment employs Y and Nb doped TiO 2 The prepared ceramic powder is used as a main raw material, the high-dielectric ceramic sphere 16 required by the embodiment is obtained through molding and sintering, the dielectric constant of the obtained high-dielectric ceramic sphere 16 at the frequency of 1600-3200Hz is 23000-34000, the diameter of the obtained high-dielectric ceramic sphere 16 is 2.3-2.5mm, and the sphericity is more than 90%.
In this embodiment, one pole of the ac power source is connected to the central electrode 1, and the other pole of the ac power source is connected to the annular barrel electrode 4, and the ac power source is sinusoidal ac or pulsed ac.
The assembly steps of the dielectrophoresis purification module in the embodiment are as follows: firstly, mounting a second bracket 6 at one end of an annular barrel-shaped electrode 4, inserting a central electrode 1 into a through hole of the second bracket 6, enabling two ends of the central electrode 1 to protrude out of the end part of the annular barrel-shaped electrode 4, then enabling the second bracket 6 to face downwards so as to enable the annular barrel-shaped electrode 4 to be vertically fixed, and filling a high-dielectric ceramic sphere 16 into a cavity structure formed by the central electrode 1, the annular electrode and a support frame from one end of a first bracket 3 until the hollow structure is filled; then, the first bracket 3 is arranged, the center electrode 1 passes through the through hole of the first bracket 3, and the positions of the center electrode 1 and the annular barrel-shaped electrode 4 are fixed; then, a second terminal 7 is welded on the central electrode 1, and a first terminal 5 is welded on the annular barrel electrode 4; finally, the first terminal 5 and the second terminal 7 are connected to an ac power source via electrode leads, respectively. In this embodiment, in order to avoid electric shock and leakage problems, the annular barrel electrode 4 and the portion of the center electrode 1 protruding from the annular electrode 4 and the electrode lead welding spot are subjected to insulation treatment to ensure electrical safety.
For the detection effect, the assembled dielectrophoresis purification module is placed in a ventilation pipe, and gaps between the inner wall of the ventilation pipe and the edge of the barrel-shaped electrode 4 are filled with cement; one side of the ventilation pipe is provided with a blower, one end of the blower is provided with an air inlet, the other end of the blower is provided with an air outlet, and then the content of dust particles is respectively observed at the air inlet and the air outlet. Experimental conditions: the waveform of the alternating current power supply is sinusoidal alternating current or pulse alternating current, the frequency of the alternating current power supply is 800-5000Hz, the voltage of the alternating current power supply is 200-3000V/cm (namely, the ratio of the voltage U of the alternating current power supply to the distance d between the central electrode 1 and the annular barrel electrode 4 is 200-3000V/cm) for meeting the electric field strength of the central electrode 1 and the annular barrel electrode 4.
Specifically, the input voltage of the alternating current power supply in the embodiment 1 is 1500V, the annular barrel-shaped electrode 4 adopts a copper pipe structure with the inner diameter of 30mm, the length of the copper pipe structure is 150mm, the central electrode 1 adopts a solid copper bar structure with the diameter of 4mm, and the length of the central electrode is 180mm; the support frame adopts insulating plastics to make into bottle lid shape, and the internal diameter is 30mm, just can seal the both ends of annular barrel electrode 4, and the through-hole of 4mm is punched at support frame bottom surface center simultaneously, and center electrode 1 just can pierce through fixedly, and the bottom surface opens into array trompil netted gap structure simultaneously. In this example, the diameter of the high dielectric ceramic is 2.3-2.5mm, and the maximum size of the gap of the opening of the support frame is 1.8mm. In addition, in order to explain the influence of the size of the annular barrel electrode 4 on the purifying effect, a copper pipe structure having a diameter of 60mm was selected as the annular barrel electrode 4 as comparative example 1; correspondingly, comparative example 1 used the same materials and other corresponding parameters as example 1 to prepare a matched center electrode 1 and support frame; in 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 test results for example 1 and comparative example 1
As can be seen from table 1, the purification effect of example 1 on PM2.5 and PM5.0 with a larger size was 100%, and the purification rate of PM0.5 with a smaller size was 99.7% or more, which can demonstrate that the technical solution of example 1 can achieve an ultra-purification effect on dust particles in the air. In addition, as can be seen from the results of comparative example 1, when the diameter size of the annular barrel electrode 4 is increased to 60mm, the cleaning effect on dust is significantly reduced, for example, the cleaning rate for PM2.5 dust is only 62.2%, and the cleaning rate for finer dust of PM0.5 is lower, and is only 17.4%, although the high dielectric ceramic spheres 16 of the same dielectric constant class are employed. The test results of example 1 and comparative example 1 show that the diameter of the annular barrel electrode is required to meet specific size requirements in order to achieve a good cleaning effect.
Example 2, comparative example 2 and comparative example 3
To further illustrate the beneficial effects of the present invention, the following description will be made with reference to example 2; meanwhile, in order to demonstrate the critical role of the diameter size of the high dielectric ceramic balls 16 and the dielectric constant of the ceramic ball matrix in the present technology in the purification of the dielectrophoresis electrode structure, description will be made with reference to comparative example 2 (changing the diameter size of the high dielectric ceramic balls) and comparative example 3 (changing the dielectric constant of the high dielectric ceramic balls 16).
Based on the example 1, the example 2, the comparative example 2 and the comparative example 3 adopt the same size of the central electrode 1 and the annular barrel electrode 4, namely the annular barrel electrode 4 adopts a copper pipe with the inner diameter of 30mm, the length of the copper pipe is 150mm, the central electrode 1 adopts a solid copper bar structure with the diameter of 4mm, and the length of the copper pipe is 180mm; the support frame adopts insulating plastics to make into bottle lid shape, and the internal diameter is 30mm, just can seal the both ends of annular copper pipe electrode, and the gap accounts for 85-88% of support frame cross-sectional area in the support frame simultaneously, and 4 mm's through-hole is perforated at the support frame center.
Preferably, example 2 uses pure calcium copper titanyl (CaCu 3 Ti 4 O 12 Abbreviated as CCTO) ceramic powder, a high dielectric ceramic sphere 16 was prepared with a diameter size of 2.5-2.8mm, the resulting high dielectric ceramic sphere 16 matrix had a dielectric constant of 24500-27890 in the frequency range of 1000-3000Hz, a high dielectric ceramic sphere 16 was also prepared with the same CCTO ceramic powder in comparative example 2, but the high dielectric ceramic sphere 16 had a diameter of 4.8-5.0mm, and a CCTO-15% al was used in comparative example 3 2 O 3 The mixed powder is used for preparing high dielectric ceramic spheres 16 with the thickness of 2.5-2.8mm, and the dielectric constant of the obtained high dielectric ceramic spheres 16 in the frequency range of 1000-3000Hz is 5500-7630. The three high dielectric ceramic spheres 16 are respectively arranged in a central electrode 1, an annular barrel-shaped electrode 4 and a supporting frameIn the enclosed cavity structure, a dielectrophoresis electrode structure is formed, then an alternating current power supply is connected with the central electrode 1 and the annular electrode, the original voltage of the alternating current power supply is regulated to 1200-1600V, and the frequency is 1300-2800 Hz. When the purification effect test was performed on example 2, comparative example 2 and comparative example 3, the same test method as in example 1 was used, and the test results are shown in table 2.
Table 2 test results for example 2, comparative example 2 and comparative example 3
As shown in Table 2, in example 2, when the high dielectric ceramic sphere 16 was used in a size of 2.5 to 2.8mm and the dielectric constant was 24500 to 27890, the purification effect was remarkable, and the purification rate for PM2.5 could reach 100%; in contrast, in comparative example 2, when the size of the high dielectric ceramic sphere 16 is large (4.8 to 5.0 mm), the purifying effect is not ideal, and the purifying rate for PM2.5 is 78.6%; further, as is clear from comparative example 3, when the dielectric constant of the high dielectric ceramic sphere 16 is smaller in the range of 5500 to 7630, the dust cleaning rate is remarkably deteriorated, for example, the cleaning rate for PM2.5 is only 62.2%, and the cleaning rates for PM0.5 and PM1.0 are lower, for example, only 21.4% and 31.6%, although the diameter of the ceramic sphere 16 is the same as that of example 2. Thus, it can be demonstrated from the results of the combination of example 2 and comparative example 2 that when the high dielectric ceramic balls 16 have a high dielectric constant (between 24500-27890), the high dielectric ceramic balls 16 size is an important factor affecting the cleaning rate; in addition, it is understood from the results of the test of example 2 and comparative example 3 that the influence of the dielectric constant of the ceramic ball matrix on the cleaning rate is also very important when the high dielectric ceramic ball is of an appropriate diameter size. According to the principle of realizing the beneficial effects in the technical scheme of the invention, the higher the dielectric constant of the matrix of the high-dielectric ceramic balls 16 is, the higher the polarization intensity of the high-dielectric ceramic balls 16 in an electric field is, and the stronger the electric field gradient corresponding to the gap area between the ceramic balls is, so that the dielectrophoresis force of dust is improved to enhance the purifying effect. Therefore, in order to achieve a high-quality purifying effect, the dielectric constant of the high-dielectric ceramic balls 16 needs to reach a certain value.
Example 3
In accordance with the teachings of the present invention, there is also provided another dielectrophoresis gas-purifying cell module based on a high dielectric material, which will be described below in connection with example 3.
Referring to fig. 8-12, in embodiment 3, a dielectrophoresis gas purification unit module based on a high dielectric material further includes a connection plate 9, and a plurality of dielectrophoresis electrode structures are disposed on the connection plate 9. In the present embodiment, four dielectrophoresis electrode structures, but not limited to four, are used, namely, a first structure 10, a second structure 11, a third structure 12 and a fourth structure 13. The central electrode 1 of each dielectrophoresis electrode structure is respectively connected with one pole of an alternating current power supply, and the annular barrel-shaped electrode 4 of each dielectrophoresis electrode structure is respectively connected with the other pole of the alternating current power supply. The connecting plate 9 is provided with a plurality of mounting grooves 15, dielectrophoresis electrode structures are fixedly mounted in the mounting grooves 15, the connecting plate 9 is also provided with slotted holes, rubber plugs 14 are arranged in the slotted holes, connecting leads can be penetrated in the rubber plugs 14, the plurality of dielectrophoresis electrode structures are connected in parallel to form a gas purification module, namely a plurality of dielectrophoresis electrode structures are mounted on one connecting plate 9 to form a module, and two poles of an alternating current power supply are respectively connected with the central electrode 1 of each dielectrophoresis and the annular barrel-shaped electrode 4. To examine the purifying effect of the dielectrophoresis gas purifying unit module of example 3, the same method as in examples 1 and 2 was adopted, the dielectrophoresis gas purifying unit module was placed in a pipe, the circulation of gas was achieved by a blower, the frequency of an ac power supply was adjusted to 800-4800Hz, the voltage was 200-2800V, and then the particle contents of the gas inlet and the gas outlet were tested and the purifying rate was calculated, respectively. The detection result is as follows: the purification rate of PM0.5 and PM1.0 is 92.4% -99.7%; the PM2.5 purge is 99.9-100%.
From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:
the high dielectric ceramic sphere 16, the central electrode 1, the annular barrel-shaped electrode 4 and the supporting frame have simple and stable structures, and are easy for industrialized batch production;
the high dielectric ceramic sphere 16 is filled between the central electrode 1 and the annular barrel-shaped electrode 4, and the filling assembly is easy to operate; when each part needs to be cleaned, the high dielectric ceramic sphere 16 can be taken out for cleaning and then filled, so that no consumable waste exists;
the high-dielectric ceramic sphere 16 has stable performance, the high-dielectric ceramic sphere 16 can be reused, the high-dielectric ceramic sphere 16 is high-temperature resistant, and the gas can be purified at high temperature;
the air dust purifying effect is good, and the PM2.5 purifying rate can reach 100%;
in the purifying unit, the high dielectric ceramic spheres 16 are mutually piled to form gaps naturally, the gap size is between 0.5 and 1.5mm, and the gap size is far greater than that of the filter screen, so that when dust purification is carried out on air, the wind resistance can be reduced, on the one hand, the power of a fan can be reduced, and the noise of the purifier is reduced; on the other hand, the ventilation quantity can be increased, and the purification efficiency is increased.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A dielectrophoresis gas purification unit module based on a high dielectric material, comprising:
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 fixedly 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;
an alternating current power supply, wherein 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 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 alternating current power supply is 800-5000Hz, and the voltage of the alternating current power supply meets the electric field strength between the central electrode and the annular barrel-shaped electrode of 200-3000V/cm.
2. The dielectrophoresis gas purification unit module of claim 1, wherein the support frame is made of an insulating material, the support frame comprises a first support and a second support, the first support is provided with a first gap, the second support is provided with a second gap, and the widths of the first gap and the second gap are smaller than the diameter of the high dielectric ceramic sphere.
3. The dielectrophoresis gas purification unit module based on a high dielectric material of claim 1, wherein the annular barrel electrode is of a metal tube structure and the central electrode is of a solid metal rod structure.
4. The dielectrophoresis gas purification unit module of claim 1, further comprising a connection plate on which a plurality of dielectrophoresis electrode structures are disposed, a center electrode of each dielectrophoresis electrode structure being connected to one pole of an ac power source, and a ring-shaped barrel electrode of each dielectrophoresis electrode structure being connected to the other pole of the ac power source.
5. The dielectrophoresis gas purification unit module based on a high dielectric material according to claim 1, wherein the support frame is provided with a through hole at a central position thereof, and a central electrode is inserted into the through hole.
6. The dielectrophoresis gas purification unit module of claim 1, wherein the annular barrel electrode has a first terminal welded thereto and the central electrode has a second terminal welded thereto, the first and second terminals being connected to an ac power source via electrode leads, respectively.
7. The dielectrophoresis gas purification unit module based on a high dielectric material of claim 1, wherein the ac power source is sinusoidal ac or pulsed ac.
8. The dielectrophoresis gas purification unit module based on a high dielectric material of claim 4, wherein the connection plate is provided with a plurality of mounting slots, and a dielectrophoresis electrode structure is fixedly mounted in the mounting slots.
9. The dielectrophoresis gas purification unit module based on a high dielectric material according to claim 4, wherein the connection plate is provided with a slot hole, a rubber plug is arranged in the slot hole, and a connection lead is penetrated in the rubber plug.
10. A dielectrophoresis gas purification method based on a high dielectric material, the dielectrophoresis gas purification unit module based on a high dielectric material according to any one of claims 1 to 9, comprising:
the two poles of an alternating current power supply are respectively connected with a central electrode and an annular barrel-shaped electrode, a non-uniform electric field is generated between the central electrode and the annular barrel-shaped electrode, a high dielectric ceramic sphere with a high dielectric constant filled between the central electrode and the annular barrel-shaped electrode is highly polarized, a large amount of induced charges are generated on the surface of the high dielectric ceramic sphere, the electric field between the central electrode and the annular barrel-shaped electrode is changed drastically under the action of a curved surface structure of the high dielectric ceramic sphere, so that a gap area between the high dielectric ceramic spheres forms a great electric field gradient, dust particles are enhanced to be subjected to dielectrophoresis force, and move towards the high dielectric ceramic spheres under the action of dielectrophoresis force and are adsorbed on the surface of the high dielectric ceramic spheres, so that the dust particles in the air are efficiently captured.
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Inventor after: Li Wang Inventor after: Zhang Xing Inventor after: Li Zhixin Inventor after: Yan Junliang Inventor after: Guo Hao Inventor after: Chen Zhiguo Inventor after: Xu Shu Inventor after: Wang Chunhui Inventor before: Li Wang Inventor before: Zhang Xing Inventor before: Li Zhixin Inventor before: Yang Mingchao Inventor before: Ma Deqiang |
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Effective date of registration: 20240205 Address after: 066000 No. 2, Zushan Road, Qinhuangdao Economic and Technological Development Zone, Hebei Province Patentee after: YUANKE QINHUANGDAO ENERGY SAVING AND ENVIRONMENTAL PROTECTION TECHNOLOGY DEVELOPMENT Co.,Ltd. Country or region after: China Address before: 066099 No. 360, west section of Hebei Street, Haigang District, Qinhuangdao City, Hebei Province Patentee before: HEBEI NORMAL University OF SCIENCE & TECHNOLOGY Country or region before: China |