An ionic wind purifier for needle-catalyst honeycomb porous material structure

Abstract

The application discloses an ion wind purification device with a needle-honeycomb porous catalytic material structure, and aims to solve the problems of the existing ion wind purification device in the control of ion wind speed and by-products 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, the needle tips of the plurality of needle electrodes are provided with a first distance from the catalytic structure, and a first power supply is connected between the electrode substrate and the catalytic structure. The catalytic structure has a plurality of first through holes, the plurality of first through holes are arranged in a honeycomb shape, the plurality of needle electrodes are arranged towards the plurality of first through holes and correspond to the plurality of first through holes one by one. The catalytic structure is used for decomposing harmful by-products, and the purification of ion wind is realized. The catalytic structure is arranged in a honeycomb porous structure, the wind speed of ion wind is increased, and the purification efficiency is improved.

Description

TECHNICAL FIELD

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

[0002] Volatile organic compounds (VOCs) are one of the main components of indoor and outdoor air pollution, which come from industrial waste gas, building materials, paint and decomposition of household waste, etc. Common VOCs such as toluene and trimethylamine (TMA) have strong toxicity, and long-term exposure to VOCs environment can cause human health risks such as respiratory tract irritation, nervous system damage, and even carcinogenesis. At present, the mainstream processing methods of VOCs include activated carbon adsorption method and photocatalytic oxidation method. The activated carbon adsorption method removes VOCs through physical adsorption, but has 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 excited 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 collision of charged particles generated by corona with air molecules under the action of electric field. With the continuous deepening of the research on ion wind, its application field has been continuously expanded.

[0004] In recent years, the ion wind purification technology based on corona discharge has been applied in the field of air purification due to its high efficiency, wide 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 VOC molecules to make them decompose, and active particles react with VOC molecules to make them degrade. However, the existing ion wind purification device still has the following shortcomings in practical application: the existing ion wind purification device generates by-products mainly including ozone (O3) during the discharge process, and these by-products accumulate continuously, causing secondary pollution; the ion wind speed generated by the existing ion wind purification device is low, which makes it difficult to drive the gas to circulate quickly, thereby limiting the overall purification efficiency. SUMMARY

[0005] The purpose of the present application is to provide an ion wind purification device with a needle-honeycomb porous catalytic material structure, which aims to solve the problems of the existing ion wind purification device in controlling the ion wind speed and by-products such as ozone.

[0006] To solve the above problems, the present application provides an ion wind purification device with a needle-honeycomb porous catalytic material structure, which comprises 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 provided with 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 one 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 are arranged towards and correspond to the plurality of first through holes.

[0009] Preferably, the device further comprises a ring electrode and a resistor, the ring electrode is located between the needle electrode and the catalytic structure, the ring electrode is provided with a second distance from the catalytic structure, and the ring electrode is connected to the catalytic structure through the resistor.

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

[0011] Preferably, the device further comprises an induction electrode and an acceleration electrode, 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 centers of the second through holes, the centers of the third through holes, and the centers of 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 holes, the second through holes, the third through holes, and the fourth through holes have the same shape and size.

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

[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 for heating the catalytic structure.

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

[0019] Preferably, the plurality of first through-holes of each catalytic structure are arranged one by one and with the same center.

[0020] By such an arrangement, when the catalytic structure is a metal material, the catalytic structure is directly connected to the positive electrode of the first power supply, and the electrode substrate connected to the negative electrode of the first power supply forms an electric field. By arranging the needle electrode, ion wind is generated, and during the generation of ion wind, harmful by-products such as ozone are inevitably generated. The catalytic structure is used to decompose the harmful by-products, thereby achieving purification of the ion wind. In addition, the catalytic structure is arranged in a honeycomb porous structure, which accelerates the flow of air and increases the wind speed of the ion wind. At the same time, it can effectively increase the contact area between the ion wind and the catalytic structure, and improve the purification efficiency. BRIEF DESCRIPTION OF DRAWINGS

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

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

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

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

[0025] Figure 5 is a comparison diagram of ion wind speed of a common needle-induction electrode device and the ion wind purification device with honeycomb porous catalytic structure according to the present application when the honeycomb porous catalytic structure is a non-metal material and a metal material;

[0026] Figure 6 is a comparison diagram of trimethylamine purification rate of a common needle-induction electrode device and the ion wind purification device with honeycomb porous catalytic structure according to the present application when the honeycomb porous catalytic structure is a non-metal material and a metal material;

[0027] Figure 7 is a comparison diagram of ozone concentration of a common needle-induction electrode device and the ion wind purification device with honeycomb porous catalytic structure according to the present application when the honeycomb porous catalytic structure is a non-metal 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, acceleration electrode. DETAILED DESCRIPTION

[0030] In order to make the objectives, technical solutions and advantages of the present application clearer, further detailed description will be made to the present application with reference to the specific embodiments and the accompanying drawings. It should be understood that the description is only exemplary and is not intended to limit the scope of the present application. In addition, in the following description, the description of the well-known structures and techniques is omitted to avoid unnecessary confusion of the concept of the present application.

[0031] The schematic diagrams of layer structures according to embodiments of the present application are shown in the accompanying drawings. These diagrams are not drawn to scale, in which some details are exaggerated for the purpose of clarity and some details can be omitted. The shapes of various regions, layers and their relative sizes and positional relationships shown in the diagrams are only exemplary, and in practice, they can be deviated due to manufacturing tolerances or technical limitations, and regions / layers with different shapes, sizes and relative positions can be additionally designed by those skilled in the art according to actual needs.

[0032] In the description of the present application, it should be noted that the terms "first", "second", "third" are only for the purpose of description, and cannot be understood or implied as indicating or implying relative importance.

[0033] The application provides an ion wind purification device of 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 provided with 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 with the negative electrode of the first power supply, and the positive electrode of the first power supply is connected with 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, the plurality of needle electrodes 400 are arranged towards the plurality of first through holes and correspond to the plurality of first through holes one by one. Specifically, the electrode substrate 300 is used for fixing the needle electrode 400, is connected with the negative electrode of the first power supply as part of the circuit, the needle electrode 400 keeps 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 a high-voltage electric field, and then forms an ionization region, a large number of high-energy electrons exist in the region, react with odor gas molecules to degrade the odor gas molecules, and ion wind is generated towards the catalytic structure 200 under the action of the electric field, and is further accelerated through the channel in the honeycomb porous catalytic structure 200, and ozone in the gas and odor molecule degradation by-products are further reacted under the action of the honeycomb porous catalytic structure 200 to be completely decomposed. The ion wind is generated by the needle electrode 400, and harmful by-products are decomposed by the honeycomb porous catalytic structure 200, so that the purpose of purifying air is achieved, and the ion wind generation and harmful by-product treatment are combined. It should be noted that in the preferred case, the needle electrode 400 is fixed vertically on the electrode substrate 300, the electrode substrate 300 is arranged in parallel with the catalytic structure 200, the needle tip of the needle electrode 400 is collinear with the center of the first through hole, that is, the straight line position of the needle electrode 400 vertically passes through the circle of the first through hole. Through such a setting, the flow path of the ion wind is at the center position of the first through hole, which is beneficial to the flow of the ion wind.

[0034] It should be noted that the specific shape of the electrode substrate 300, the needle electrode 400 and the catalytic structure 200 is not limited here, and it is only required to generate ion wind and complete the purification of ion wind. In an optional case, the needle electrode 400 is a metal material, such as tungsten or stainless steel, etc., 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 needle tip curvature radius is 0.01-0.05mm. It can ensure that the needle electrode 400 generates stable and appropriate strength ion wind, and the metal material ensures good electrical conductivity, which is conducive to the generation of ion wind and optimizes the generation effect of ion wind. Further, 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 by-products, and also does not hinder the flow of ion wind too much, ensuring the balance of purification efficiency and effect. Further, the catalytic structure 200 is loaded with a catalyst, and the catalyst includes a transition metal oxide catalyst. Here, the specific material of the catalyst is not limited as long as it can decompose harmful by-products, and preferably, the catalyst includes α-MnO2 and / or TiO2. Compared with traditional transition metal oxide catalysts, α-MnO2 has higher catalytic activity and thermal chemical 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 prolong the service life of the catalyst. Here, the specific method of loading the catalyst onto the catalytic structure 200 is not limited. In an optional case, when the catalytic structure 200 is a metal material, such as foamed copper, the impregnated coating method of catalyst slurry is used for loading; when the catalytic structure 200 is a non-metal material, such as a microporous material, such as porous ceramics, it is first pretreated by impregnated coating of an alumina layer, and then loaded with a potassium permanganate solution and a high-temperature calcination in stages.

[0035] In a preferred case, the device further comprises a ring electrode 101 and a resistor 102, the ring electrode 101 is located between the needle electrode 400 and the catalytic structure 200, the ring electrode 101 is provided with a second distance from the catalytic structure 200, and the ring electrode 101 is connected to the catalytic structure 200 through the resistor 102; the ring electrode 101 has a plurality of second through holes, and the center of the circle of the second through hole is collinear with the center of the circle of the first through hole. In an embodiment, the resistance value of the resistor 102 is in the range of 1MΩ-100MΩ. When the electrons move in the electric field, they have a certain energy. By setting the resistor 102 with a suitable resistance value, the movement and energy state of the electrons can be regulated, so that the average energy of the electrons is more concentrated in the range of 5-10eV. By adjusting the average energy distribution of the electrons in this way, the generation amount of ozone is reduced, and the degradation efficiency of odor gas is enhanced. At the same time, the center of the circle of the second through hole is collinear with the center of the circle of the first through hole, which is conducive to the smooth passage of ion wind and improves the wind speed of ion wind.

[0036] AsFigure 2 and Figure 3 As shown in FIG. 8, when the catalytic structure 200 is a multi-porous material such as porous ceramic, an induction electrode 100 is arranged on one side of the catalytic structure 200, and an 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 centers of the second through-holes, the centers of the third through-holes, and the centers of the fourth through-holes are collinear. Through such arrangement, the ion wind flows from the needle electrode 400 to the induction electrode 100 and is blown out along the acceleration electrode 201 through the catalytic structure 200. The collinear arrangement of the centers of the first through-holes, the second through-holes, the third through-holes, and the fourth through-holes ensures that the ion wind can flow along a specific path efficiently, improving the wind speed of the ion wind, the purification efficiency, and the effect. It should be noted that the specific shape of the first through-holes, the second through-holes, the third through-holes, and the fourth through-holes is not limited here, and in a preferred case, the shapes and sizes of the first through-holes, the second through-holes, the third through-holes, and the fourth through-holes are consistent. In one embodiment, the induction electrode 100 is made of a metal conductive material, has a thickness of 0.5-5 mm, and the shapes of the first through-holes, the second through-holes, the third through-holes, and the fourth through-holes 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 is connected with a second power source, the induction electrode 100 is connected with the negative pole of the second power source, and the acceleration electrode 201 is connected with the positive pole of the second power source, and the second power source is used to accelerate the flow of the ion wind in the catalytic structure 200. By applying the second power source, the flow of the ion wind in the catalytic structure 200 is enhanced, further improving the wind speed of the ion wind, while also improving the purification efficiency, so that the ion wind can pass through the catalytic structure 200 more quickly and fully contact the catalyst, thereby more effectively decomposing harmful by-products. Specifically, when the catalytic structure 200 is a non-metallic material, the acceleration electrode 201 is arranged on the side away from the needle electrode 400, the second power source is connected between the acceleration electrode 201 and the induction electrode 100, and in an optional case, the electric field strength between the acceleration electrode 201 and the induction electrode 100 is 100-300 kV / m, which is used to further accelerate the flow of the ion wind.

[0038] In combination with Figure 1 and Figure 2In the preferred case, the electrode substrate 300 has a plurality of fifth through holes, and the needle electrode 400 is arranged alternately with the fifth through holes. The specific shape and size of the fifth through hole are not limited here, and in the optional case, the fifth through hole is circular or regular convex polygon, and the radius or the radius of the inscribed circle is 3-7mm. Through such a setting, the flow path of the ion wind can be optimized to be closer to a straight line, thereby increasing the ion wind speed. By arranging the needle electrode 400 alternately with the fifth through hole, the generation and diffusion of the ion wind are facilitated while ensuring the fixation of the needle electrode 400, thereby improving the performance of the overall device.

[0039] In the preferred case, when the catalytic structure 200 is metal, the catalytic structure 200 can also be connected to a heating unit. By providing a heating unit, the temperature of the catalytic structure 200 is maintained at 60-105℃, so as 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] In combination Figure 4 , the ion wind purification series device of the needle-honeycomb porous catalytic material structure provided by the present application comprises 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 generated and purified for multiple times, effectively increasing 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 direction can also accelerate and purify the ion wind again, further improving the wind speed and purification effect of the ion wind. In addition, 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, and the ion wind can be generated and purified in the device. In the preferred case, the plurality of first through holes of each catalytic structure 200 are arranged one by one and the centers are collinear. 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] In combination Figure 5 , the experimental results show that, compared with the ordinary needle-induction electrode 100 ion wind purification device, when the honeycomb porous catalytic structure 200 is a non-metallic material and is provided with an acceleration electrode 201 and a ring electrode 101, the ion wind speed of the needle-honeycomb porous catalytic material structure ion wind purification device 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, the ion wind speed increases by about 37.64%.

[0042] In combination Figure 6The experimental results show that, compared with the common needle-induction electrode 100 ion wind purification device, the ion wind purification device with the needle-honeycomb porous catalytic material structure, when the honeycomb porous catalytic structure 200 is a non-metal material and is provided with the accelerating electrode 201 and the annular electrode 101, the trimethylamine purification rate is increased 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, the trimethylamine purification rate is increased by about 42.65%.

[0043] In combination Figure 7 The experimental results show that, compared with the common needle-induction electrode 100 ion wind purification device, the ion wind purification device with the needle-honeycomb porous catalytic material structure, when the honeycomb porous catalytic structure 200 is a non-metal material and is provided with the accelerating electrode 201 and the annular electrode 101, the 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, the ozone concentration is reduced by about 80.58%.

[0044] It should be understood that the above specific embodiments of the present application are only used for illustrative or explanatory purposes of the principles of the present application, and do not constitute a limitation of the present application. Therefore, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present application shall be included in the protection scope of the present application. In addition, the appended claims of the present application are intended to cover all variations and modifications falling within the scope and boundary of the appended claims, or the equivalent forms of such scope and boundary.

Claims

1. An ion wind purification apparatus of a needle-catalyst honeycomb porous material structure, characterized by, The device comprises an electrode substrate (300), a plurality of needle electrodes (400), a catalytic structure (200), a ring electrode (101), an induction electrode (100) and an acceleration electrode (201); 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 supply is connected between the electrode substrate (300) and the catalytic structure (200), the electrode substrate (300) is connected with the negative electrode of the first power supply, and the positive electrode of the first power supply is connected with 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) are arranged towards and correspond to the plurality of first through holes; The ring electrode (101) is located between the needle electrode (400) and the catalytic structure (200), the ring electrode (101) is provided with a second distance from the catalytic structure (200), and the ring electrode (101) is connected with the catalytic structure (200); The ring electrode (101) has a plurality of second through holes, and the centers of the second through holes and the first through holes are collinear; 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; The induction electrode (100) and the acceleration electrode (201) are connected with a second power supply, the induction electrode (100) is connected with the negative electrode of the second power supply, the acceleration electrode (201) is connected with the positive electrode of the second power supply, and the second power supply is used for accelerating the flow of ion wind in the catalytic structure (200).

2. The apparatus of claim 1, wherein, The device further comprises a resistor (102), and the ring electrode (101) is connected with the catalytic structure (200) through the resistor (102).

3. The apparatus of claim 1, wherein, The first through holes, the second through holes, the third through holes and the fourth through holes are of the same shape and size.

4. The apparatus of claim 1, wherein, The electrode substrate (300) has a plurality of fifth through holes, and the needle electrodes (400) are arranged alternately with the fifth through holes.

5. The apparatus of claim 1, wherein, The catalytic structure (200) is loaded with a catalyst, and the catalyst comprises a transition metal oxide catalyst.

6. The apparatus of claim 1, wherein, The device further comprises a heating unit for heating the catalytic structure (200).

7. An ion wind purification tandem device of a needle-catalytic honeycomb porous material structure, characterized in that, The series device comprises a plurality of ion wind purification devices according to any one of claims 1-6, and the plurality of ion wind purification devices are connected in series.

8. The apparatus of claim 7, wherein, The plurality of first through holes of each catalytic structure (200) are arranged one by one and collinearly.

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