Ionic wind purification device with needle-honeycomb porous catalytic material structure

Abstract

The invention discloses an ionic wind purification device with a needle-honeycomb porous catalytic material structure, and aims to overcome the defects of an existing ionic wind purification device in the aspects of ionic wind speed control and by-product control such as ozone. The device comprises an electrode substrate, a plurality of needle electrodes and a catalytic structure, the plurality of needle electrodes are fixed on the electrode substrate, a first distance is formed between the needle tips of the plurality of needle electrodes and the catalytic structure, and a first power supply is connected between the electrode substrate and the catalytic structure; the catalytic structure is provided with a plurality of first through holes, the plurality of first through holes are arranged in a honeycomb shape, and the plurality of needle electrodes face the plurality of first through holes and are arranged in one-to-one correspondence with the plurality of first through holes. And harmful byproducts are decomposed by utilizing a catalytic structure, so that purification of ionic wind is realized. The catalytic structure is arranged to be a honeycomb-shaped porous structure, so that the wind speed of ionic wind is increased, and the purification efficiency is improved.

Description

Technical Field

[0001] The invention relates to the field of air purification, and in particular to an ion wind purification device with a needle-honeycomb porous catalytic material structure. Background Art

[0002] Volatile organic compounds (VOCs) are one of the main components of indoor and outdoor air pollution, originating from industrial waste gas, building materials, coatings and decomposition of domestic waste. Common VOCs such as toluene and trimethylamine (TMA) are highly toxic. Long-term exposure to VOCs environment will lead to human health risks, such as respiratory irritation, nervous system damage, and even carcinogenesis. At present, the mainstream treatment methods of VOCs include activated carbon adsorption and photocatalytic oxidation. The activated carbon adsorption method removes VOCs by physical adsorption, but there are problems such as easy saturation and limited adsorption capacity; the photocatalytic oxidation method relies on the free radicals generated by the catalyst under ultraviolet light to decompose VOCs, but the light utilization rate is low and the efficiency is limited.

[0003] Under the condition of high curvature radius of discharge electrode, corona discharge is usually accompanied by physical phenomena such as light, heat, and sound. In addition, near the specific area where the corona phenomenon occurs, there is also an air jet stimulated by the corona effect, which is usually called ion wind (also known as corona wind). At present, it is generally believed that the ion wind phenomenon is caused by the charged particles generated by the corona accelerating under the action of the electric field and colliding with air molecules. With the continuous deepening of the research on ion wind, its application field has been continuously expanded.

[0004] In recent years, ion wind purification technology based on corona discharge has been applied to the field of air purification due to its high efficiency, broad spectrum, safety and energy saving. This technology can generate a large number of high-energy electrons and active particles. Among them, high-energy electrons collide with VOCs molecules to decompose them, and active particles react with VOCs molecules to degrade them. However, the current ion wind purification devices still have the following shortcomings in practical applications: the existing ion wind purification devices will generate by-products mainly composed of ozone (O3) during the discharge process. These by-products continue to accumulate and cause secondary pollution; the ion wind speed generated by the existing ion wind purification devices is relatively low, which makes it difficult to drive the gas to achieve rapid circulation, limiting the overall purification efficiency. Summary of the invention

[0005] The purpose of the present invention is to provide an ion wind purification device with a needle-honeycomb porous catalytic material structure, aiming to solve the shortcomings of existing ion wind purification devices in terms of ion wind speed and control of by-products such as ozone.

[0006] To solve the above problems, the present invention provides an ion wind purification device with a needle-honeycomb porous catalytic material structure, comprising an electrode substrate, a plurality of needle electrodes and a catalytic structure;

[0007] The plurality of needle electrodes are fixed on the electrode substrate, the needle tips of the plurality of needle electrodes are set at a first distance from the catalytic structure, a first power supply is connected between the electrode substrate and the catalytic structure, the electrode substrate is connected to the negative electrode of the first power supply, and the positive electrode of the first power supply is connected to an end of the catalytic structure close to the needle electrode;

[0008] The catalytic structure has a plurality of first through holes, the plurality of first through holes are arranged in a honeycomb shape, and the plurality of needle electrodes face the plurality of first through holes and are arranged one by one corresponding to the plurality of first through holes.

[0009] Preferably, the device further comprises an annular electrode and a resistor, wherein the annular electrode is located between the needle electrode and the catalytic structure, a second distance is set between the annular electrode and the catalytic structure, and the annular electrode is connected to the catalytic structure via the resistor;

[0010] The annular electrode has a plurality of second through holes, and the centers of the second through holes are colinear with the centers of the first through holes.

[0011] Preferably, the device further comprises an induction electrode and an acceleration electrode, wherein the induction electrode is arranged on one side of the catalytic structure close to the needle electrode, and the acceleration electrode is arranged on the other side of the catalytic structure;

[0012] The induction electrode has a plurality of third through holes, the acceleration electrode has a plurality of fourth through holes, and the centers of the first through holes, the second through holes, the third through holes and the fourth through holes are collinear.

[0013] Preferably, the induction electrode and the acceleration electrode are connected to a second power supply, the induction electrode is connected to the negative electrode of the second power supply, and the acceleration electrode is connected to the positive electrode of the second power supply, and the second power supply is used to accelerate the flow of ion wind in the catalytic structure.

[0014] Preferably, the first through hole, the second through hole, the third through hole and the fourth through hole have the same shape and size.

[0015] Preferably, the electrode substrate has a plurality of fifth through holes, and the needle electrodes and the fifth through holes are arranged alternately.

[0016] Preferably, the catalytic structure is loaded with a catalyst, and the catalyst comprises a transition metal oxide catalyst.

[0017] Preferably, the device further comprises a heating unit, and the heating unit is used to heat the catalytic structure.

[0018] Another aspect of the present invention provides an ion wind purification series device of a needle-honeycomb porous catalytic structure, comprising a plurality of ion wind purification devices, wherein the plurality of ion wind purification devices are connected in series.

[0019] Preferably, the plurality of first through holes of each of the catalytic structures correspond to each other one by one and the centers of the circles are arranged on a colinear line.

[0020] Through such a setting, when the catalytic structure is made of metal material, the catalytic structure is directly connected to the positive electrode of the first power source, and the electrode substrate connected to the negative electrode of the first power source forms an electric field. By setting the needle electrode, ion wind is generated. In the process of generating ion wind, harmful byproducts such as ozone are inevitably generated. The catalytic structure is used to decompose the harmful byproducts, thereby achieving purification of the ion wind. In addition, the catalytic structure is set as a honeycomb porous structure, which accelerates the flow of airflow, increases the wind speed of the ion wind, and can effectively increase the contact area between the ion wind and the catalytic structure, thereby improving the purification efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of an ion wind purification device with a needle-honeycomb porous catalytic material structure according to a first embodiment of the present invention;

[0022] Figure 2 is a schematic structural diagram of an ion wind purification device with a needle-honeycomb porous catalytic material structure according to a second embodiment of the present invention;

[0023] Figure 3 is a circuit connection schematic diagram of an ion wind purification device with a needle-honeycomb porous catalytic material structure according to a second embodiment of the present invention;

[0024] Figure 4 2 is a schematic diagram of a multi-stage series structure of an ion wind purification device with a needle-honeycomb porous catalytic material structure according to a third embodiment of the present invention;

[0025] Figure 5 It is a comparison diagram of the ion wind speed when the honeycomb porous catalytic structure of the common needle-induced electrode device and the device of the present invention is a non-metallic material and a metal material;

[0026] Figure 6 It is a comparison chart of trimethylamine purification rates when the honeycomb porous catalytic structure of the common needle-induction electrode device and the device of the present invention is made of non-metallic material and metallic material;

[0027] Figure 7 It is a comparison diagram of ozone concentration when the honeycomb porous catalytic structure of a common needle-induced electrode device and the device of the present invention is a non-metallic material and a metal material.

[0028] Reference numerals:

[0029] 100. Induction electrode, 200. Catalytic structure, 300. Electrode substrate, 400. Needle electrode, 101. Ring electrode, 102. Resistor, 201. Accelerating electrode. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0031] The accompanying drawings show schematic diagrams of layer structures according to embodiments of the present invention. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clarity. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0032] In the description of the present invention, it should be noted that the terms “first”, “second” and “third” are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0033] The present invention provides an ion wind purification device with a needle-honeycomb porous catalytic material structure, comprising an electrode substrate 300, a plurality of needle electrodes 400 and a catalytic structure 200; the plurality of needle electrodes 400 are fixed on the electrode substrate 300, the needle tips of the plurality of needle electrodes 400 are arranged at a first distance from the catalytic structure 200, a first power supply is connected between the electrode substrate 300 and the catalytic structure 200, the electrode substrate 300 is connected to the negative electrode of the first power supply, and the positive electrode of the first power supply is connected to one end of the catalytic structure 200 close to the needle electrode 400; the catalytic structure 200 has a plurality of first through holes, the plurality of first through holes are arranged in a honeycomb shape, and the plurality of needle electrodes 400 face the plurality of first through holes and are arranged one-to-one with the plurality of first through holes. Specifically, the electrode substrate 300 is used to fix the needle electrode 400, and as part of the circuit, it is connected to the negative electrode of the first power supply. The needle electrode 400 maintains a first distance from the catalytic structure 200. The needle tip of the needle electrode 400 forms a strong local electric field under the action of the high-voltage electric field, thereby forming an ionized region. There are a large number of high-energy electrons in the region, which react with the odor gas molecules to degrade them. At the same time, under the action of the electric field, ion wind is generated toward the catalytic structure 200, and is further accelerated through the channels inside the honeycomb porous catalytic structure 200. The ozone in the gas and the degradation byproducts of the odor molecules further react under the action of the honeycomb porous catalytic structure 200 to be completely decomposed. The needle electrode 400 is used to generate ion wind, and the harmful byproducts are decomposed by the honeycomb porous catalytic structure 200, so as to achieve the purpose of purifying the air, and the generation of ion wind and the treatment of harmful byproducts are combined. It should be noted that, in a preferred case, the needle electrode 400 is vertically fixed on the electrode substrate 300, the electrode substrate 300 is arranged in parallel with the catalytic structure 200, and the needle tip of the needle electrode 400 is collinear with the center of the first through hole, that is, the straight line position where the needle electrode 400 is located vertically passes through the circle of the first through hole. Through such an arrangement, the flow path of the ion wind is located at the center of the first through hole, which is conducive to the flow of the ion wind.

[0034] It should be noted that the specific shapes of the electrode substrate 300, the needle electrode 400 and the catalytic structure 200 are not limited here, as long as the ion wind can be generated and the purification of the ion wind can be completed. In an optional situation, the needle electrode 400 is a metal material, such as tungsten or stainless steel, the range of the first power supply is 3kV-10kV, the diameter of the needle electrode 400 is 0.1-0.5mm, the length is 2-10mm, and the radius of curvature of the needle tip is 0.01-0.05mm. It can ensure that the needle electrode 400 produces a stable and appropriate intensity of ion wind. The metal material ensures good conductivity, is conducive to the generation of ion wind, and optimizes the generation effect of ion wind. Furthermore, the thickness of the catalytic structure 200 is 5-15mm, which ensures that the catalytic structure 200 has enough space and time to decompose harmful byproducts without excessively hindering the flow of ion wind, thereby ensuring a balance between purification efficiency and effect. Further, the catalytic structure 200 is loaded with a catalyst, and the catalyst includes a transition metal oxide catalyst. The specific material of the catalyst is not limited here as long as it can achieve the decomposition of harmful byproducts. Preferably, the catalyst includes α-MnO2 and / or TiO2. Compared with traditional transition metal oxide catalysts, α-MnO2 has higher catalytic activity and thermochemical stability. Its unique crystal structure and high specific surface area provide more active sites, which can effectively accelerate the redox reaction, improve the decomposition efficiency and extend the service life of the catalyst. The specific method of loading the catalyst onto the catalytic structure 200 is also not limited here. In an optional situation, when the catalytic structure 200 is a metal material, such as foamed copper, the catalyst slurry is loaded by dipping and coating; when the catalytic structure 200 is a non-metallic material, such as porous ceramics and other microporous materials, it is first pre-treated by dipping and coating an alumina layer, and then the catalyst is loaded by dipping in a potassium permanganate solution and calcining at high temperature in stages.

[0035] In a preferred case, the device further includes an annular electrode 101 and a resistor 102, the annular electrode 101 is located between the needle electrode 400 and the catalytic structure 200, the annular electrode 101 and the catalytic structure 200 are provided with a second distance, and the annular electrode 101 is connected to the catalytic structure 200 through the resistor 102; the annular electrode 101 has a plurality of second through holes, and the circular shape of the second through holes is collinear with the center of the first through hole. In one embodiment, the resistance value of the resistor 102 ranges from 1MΩ to 100MΩ, and the electron has a certain energy when moving in the electric field. By setting the resistor 102 with a suitable resistance value, the movement and energy state of the electron can be regulated, so that the average energy of the electron is more concentrated in the range of 5-10eV. Through such a setting, the average energy distribution of the electron is adjusted, thereby reducing the amount of ozone generated and enhancing the degradation efficiency of the odorous gas. At the same time, setting the center of the second through hole and the center of the first through hole collinearly is conducive to the smooth passage of the ion wind and increasing the wind speed of the ion wind.

[0036] like Figure 2 and Figure 3 As shown, when the catalytic structure 200 is a non-conductive material, such as porous ceramics and other microporous materials, an induction electrode 100 is set on one side of the catalytic structure 200, and an acceleration electrode 201 is set on the other side of the catalytic structure 200; the induction electrode 100 has a plurality of third through holes, and the acceleration electrode 201 has a plurality of fourth through holes, and the center of the first through hole, the center of the second through hole, the center of the third through hole and the center of the fourth through hole are collinear. Through such a setting, the ion wind flows from the needle electrode 400 to the induction electrode 100, and blows out along the acceleration electrode 201 through the catalytic structure 200, and the centers of the first through hole, the second through hole, the third through hole and the fourth through hole are collinearly set to ensure that the ion wind can flow efficiently along a specific path, thereby improving the wind speed, purification efficiency and effect of the ion wind. It should be noted that the specific shapes of the first through hole, the second through hole, the third through hole and the fourth through hole are not limited here. In a preferred case, the shapes and sizes of the first through hole, the second through hole, the third through hole and the fourth through hole are consistent. In one embodiment, the induction electrode 100 is made of a metal conductive material with a thickness of 0.5-5 mm. The first through hole, the second through hole, the third through hole and the fourth through hole are all circular or regular convex polygons with a radius or an inscribed circle radius of 3-7 mm.

[0037] In a preferred case, the induction electrode 100 and the acceleration electrode 201 are connected to a second power supply, the induction electrode 100 is connected to the negative electrode of the second power supply, and the acceleration electrode 201 is connected to the positive electrode of the second power supply, and the second power supply is used to accelerate the flow of the ion wind in the catalytic structure 200. By applying the second power supply, the fluidity of the ion wind inside the catalytic structure 200 is enhanced, and the wind speed of the ion wind is further increased, which is conducive to improving the purification efficiency, so that the ion wind can pass through the catalytic structure 200 more quickly and fully contact with the catalyst, thereby more effectively decomposing harmful byproducts. Specifically, when the catalytic structure 200 is a non-metallic material, by arranging the acceleration electrode 201 on the side away from the needle electrode 400, the acceleration electrode 201 and the induction electrode 100 are connected to the second power supply. In an optional case, the second power supply makes the electric field strength between the acceleration electrode 201 and the induction electrode 100 100-300kV / m, which is used to further accelerate the flow of the ion wind.

[0038] Combination Figure 1 and Figure 2In a preferred case, the electrode substrate 300 has a plurality of fifth through holes, and the needle electrodes 400 are arranged alternately with the fifth through holes. The specific shape and size of the fifth through hole are not limited here either. In an optional case, the fifth through hole is a circle or a regular convex polygon, and the radius or the radius of its inscribed circle is 3-7 mm. Through such an arrangement, the flow path of the ion wind can be optimized, making its flow path closer to a straight line, thereby increasing the speed of the ion wind. The needle electrodes 400 are arranged alternately with the fifth through holes, which is beneficial to the generation and diffusion of the ion wind while ensuring that the needle electrodes 400 are fixed, thereby improving the performance of the overall device.

[0039] In a preferred case, when the catalytic structure 200 is metal, the catalytic structure 200 can also be connected to a heating unit. By setting the heating unit, the temperature of the catalytic structure 200 is maintained at 60-105°C to enhance the reaction efficiency between the honeycomb porous catalytic structure 200 and ozone, thereby further accelerating the decomposition of by-products such as ozone.

[0040] Combination Figure 4 The present invention provides an ion wind purification series device of a needle-honeycomb porous catalytic material structure, the series device includes a plurality of ion wind purification devices, and the plurality of ion wind purification devices are connected in series. Through such a setting, the ion wind flows out after being produced and purified for multiple times, which effectively increases the strength and purification effect of the ion wind. At the same time, the needle electrode 400 and the catalytic structure 200 located downstream of the ion wind flow can also accelerate and purify the ion wind again, further improving the wind speed and purification effect of the ion wind. In addition, the setting of the series structure can meet the needs of different purification scenes and improve the applicability of the device. The specific positional relationship of the plurality of ion wind purification devices is not limited here. It can be realized by generating ion wind in the device and purifying the ion wind. In a preferred case, the plurality of first through holes of each catalytic structure 200 correspond to each other one by one and the center of the circle is arranged in a collinear manner. Through such a setting, the flow paths of the ion winds generated by different ion wind purification devices are located on the same straight line, which is more conducive to the superposition of the ion wind speed and the purification effect of the ion wind.

[0041] Combination Figure 5 The experimental results show that, compared with the ordinary needle-induced electrode 100 ion wind purification device, the ion wind purification device with the needle-honeycomb porous catalytic material structure of the present invention, when the honeycomb porous catalytic structure 200 is a non-metallic material and is provided with an accelerating electrode 201 and a ring electrode 101, its ion wind speed increases by about 45.98%; when the honeycomb porous catalytic structure 200 is a metal material and the heating unit heats the honeycomb porous catalytic structure 200, its ion wind speed increases by about 37.64%.

[0042] Combination Figure 6The experimental results show that, compared with the ordinary needle-induced electrode 100 ion wind purification device, the ion wind purification device with a needle-honeycomb porous catalytic material structure of the present invention, when the honeycomb porous catalytic structure 200 is a non-metallic material and is provided with an accelerating electrode 201 and a ring electrode 101, its trimethylamine purification rate increases by about 34.31%; when the honeycomb porous catalytic structure 200 is a metal material and the heating unit heats the honeycomb porous catalytic structure 200, its trimethylamine purification rate increases by about 42.65%.

[0043] Combination Figure 7 The experimental results show that, compared with the ordinary needle-induced electrode 100 ion wind purification device, the ion wind purification device with a needle-honeycomb porous catalytic material structure of the present invention, when the honeycomb porous catalytic structure 200 is a non-metallic material and is provided with an accelerating electrode 201 and a ring electrode 101, its ozone concentration is reduced by about 77.18%; when the honeycomb porous catalytic structure 200 is a metal material and the heating unit heats the honeycomb porous catalytic structure 200, its ozone concentration is reduced by about 80.58%.

[0044] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the appended claims of the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the appended claims, or the equivalent forms of such scope and boundaries.

Claims

1. An ion wind purification device with a needle-honeycomb porous catalytic material structure, characterized in that: The device comprises an electrode substrate (300), a plurality of needle electrodes (400) and a catalytic structure (200); The plurality of needle electrodes (400) are fixed on the electrode substrate (300), the needle tips of the plurality of needle electrodes (400) are provided with a first distance from the catalytic structure (200), a first power source is connected between the electrode substrate (300) and the catalytic structure (200), the electrode substrate (300) is connected to the negative electrode of the first power source, and the positive electrode of the first power source is connected to one end of the catalytic structure (200) close to the needle electrode (400); The catalytic structure (200) has a plurality of first through holes, the plurality of first through holes are arranged in a honeycomb shape, and the plurality of needle electrodes (400) face the plurality of first through holes and are arranged one-to-one correspondingly to the plurality of first through holes.

2. The device according to claim 1, characterized in that The device further comprises an annular electrode (101) and a resistor (102), wherein the annular electrode (101) is located between the needle electrode (400) and the catalytic structure (200), a second distance is set between the annular electrode (101) and the catalytic structure (200), and the annular electrode (101) is connected to the catalytic structure (200) via the resistor (102); The annular electrode (101) has a plurality of second through holes, and the centers of the second through holes are colinear with the centers of the first through holes.

3. The device according to claim 2, characterized in that The device further comprises an induction electrode (100) and an acceleration electrode (201), wherein the induction electrode (100) is arranged on one side of the catalytic structure (200) close to the needle electrode (400), and the acceleration electrode (201) is arranged on the other side of the catalytic structure (200); The induction electrode (100) has a plurality of third through holes, the acceleration electrode (201) has a plurality of fourth through holes, and the centers of the first through holes, the second through holes, the third through holes and the fourth through holes are collinear.

4. The device according to claim 3, characterized in that The induction electrode (100) and the acceleration electrode (201) are connected to a second power supply, the induction electrode (100) is connected to the negative electrode of the second power supply, and the acceleration electrode (201) is connected to the positive electrode of the second power supply, and the second power supply is used to accelerate the flow of ion wind in the catalytic structure (200).

5. The device according to claim 3, characterized in that The first through hole, the second through hole, the third through hole and the fourth through hole have the same shape and size.

6. The device according to claim 1, characterized in that The electrode substrate (300) has a plurality of fifth through holes, and the needle electrodes (400) are arranged alternately with the fifth through holes.

7. The device according to claim 1, characterized in that The catalytic structure (200) is loaded with a catalyst, and the catalyst comprises a transition metal oxide catalyst.

8. The device according to claim 1, characterized in that The device further comprises a heating unit, wherein the heating unit is used to heat the catalytic structure (200).

9. An ion wind purification series device with a needle-honeycomb porous catalytic material structure, characterized in that: The series device includes a plurality of ion wind purification devices, and the plurality of ion wind purification devices are connected in series.

10. The device according to claim 9, characterized in that The plurality of first through holes of each of the catalytic structures (200) correspond to each other one by one and their centers are arranged on the same line.

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