Double-nozzle atomization corona discharge oil smoke purification device and method

Abstract

The invention discloses a double-nozzle atomization corona discharge oil fume purification device and method, and belongs to the technical field of environment-friendly treatment of kitchen oil fume pollutants. The device comprises an atomizing device, a hexagonal collecting device, a supporting structure, a transverse metal rod and a longitudinal metal rod, and the longitudinal metal rod is provided with needle-shaped electrodes which are distributed in a staggered manner. The atomization device comprises a top large-flow spraying nozzle and a bottom small-flow spraying nozzle which are used for self-cleaning and water spraying atomization respectively. After oil smoke enters from the bottom, the needle-shaped electrode enables particles to be charged through corona discharge, and the particles are adsorbed to the grounded hexagonal collecting device; the small particle trapping efficiency is enhanced through synchronous atomization of liquid drops, residual oil stains are decomposed through plasmas, and after purification, cleaning liquid is sprayed to the top to achieve self-cleaning of the inner wall and the electrodes. Through the synergistic effect of corona discharge and double-nozzle atomization, the problems of low purification efficiency, frequent maintenance and high energy consumption in the traditional technology are solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of environmental protection treatment of kitchen fume pollutants, and relates to a double-nozzle atomization corona discharge fume purification device and method. Background Art

[0002] With the rapid development of the catering industry, food processing industry and industrial production, fume pollution has become an important topic in the treatment of the atmospheric environment. The fumes generated during traditional cooking and industrial production not only contain a large amount of oil particles, aerosols and volatile organic compounds (VOCs), but may also carry strong carcinogens such as benzo[a]pyrene and polycyclic aromatic hydrocarbons, posing a serious threat to the ecological environment and human health.

[0003] Currently, the mainstream fume purification technologies on the market include mechanical filtration, electrostatic adsorption, water film washing and photocatalytic oxidation. However, mechanical filtration relies on multiple layers of filter screens to intercept particulate matter, requires frequent replacement of filter materials and cannot handle ultrafine particles and gaseous pollutants; although the electrostatic adsorption technology has a high capture efficiency for micron-sized particles, it is prone to plate fouling under high humidity or high oil pollution load conditions, resulting in corona blockage and a sharp drop in purification efficiency, and it cannot effectively degrade VOCs; the water film washing method requires a large amount of water resources, is prone to secondary pollution (such as oily wastewater), and has a large equipment volume and high operation and maintenance costs; although photocatalytic oxidation can decompose organic matter, it is limited by the activity of the catalyst and the lifespan of the ultraviolet light source, and its long-term stability is insufficient.

[0004] In recent years, purification technologies based on corona discharge have received attention due to their high efficiency and low energy consumption. However, existing solutions mostly focus on a single purification mechanism and are difficult to achieve the synergistic removal of multi-component pollutants in fumes. In addition, traditional atomization technologies have low gas-liquid mass transfer efficiency due to uneven droplet sizes and limited coverage areas, which limits the synergistic effect of chemical absorption and corona discharge. Summary of the Invention

[0005] The purpose of the present invention is to overcome the above-mentioned disadvantages of the prior art and provide a double-nozzle atomization corona discharge fume purification device and method to solve the problem that it is difficult to simultaneously remove multi-component pollutants in fumes by corona discharge and traditional atomization purification technologies in the prior art.

[0006] To achieve the above object, the present invention adopts the following technical solutions: A double-nozzle atomization corona discharge fume purification device includes a hexagonal collection device with openings at both ends. The upper end of the hexagonal collection device is connected to a top spraying device and a support structure coaxially, and the support structure is inside the top spraying device; the lower end of the hexagonal collection device is connected to a bottom atomization device; the hexagonal collection device is grounded; The support structure is detachably connected with a horizontally arranged metal rod, the horizontally arranged metal rod is connected with a vertical longitudinally arranged metal rod, the longitudinally arranged metal rod is inserted into a hexagonal collection device, multiple groups of needle-shaped electrodes are distributed on the longitudinally arranged metal rod, the multiple groups of needle-shaped electrodes are arranged in a staggered array along the length direction on the longitudinally arranged metal rod, the needle-shaped electrodes are perpendicular to the longitudinally arranged metal rod, and each group of needle-shaped electrodes has three needle-shaped electrodes; A cleaning liquid spray nozzle is arranged in the top spraying device, the outlet of the cleaning liquid spray nozzle faces the hexagonal collection device, and the inlet is connected with cleaning liquid; An atomizing nozzle is arranged in the bottom atomizing device, the inlet of the atomizing nozzle is connected with water, and the outlet faces the inside of the bottom atomizing device; The upper end of the top spraying device is connected with the exhaust duct of the range hood, and the lower end of the bottom atomizing device is connected with the exhaust duct of the range hood.

[0007] A further improvement of the present invention lies in: Preferably, the hexagonal collection device is composed of six adjacent vertical plates connected in sequence; among the three needle-shaped electrodes in each group, two needle-shaped electrodes point to the connection part with the vertical plate, and one needle-shaped electrode points to the middle part of a vertical plate; among a group of needle-shaped electrodes, the included angle between any two adjacent needle-shaped electrodes is 120°.

[0008] Preferably, the included angle between any one needle-shaped electrode in the next group of needle-shaped electrodes and the two needle-shaped electrodes in the previous group is 60°.

[0009] Preferably, the lower end of the support structure is a wedge-shaped structure, and the lower end of the support structure and the hexagonal collection device are in interference fit.

[0010] Preferably, two card slots are opened at the upper end of the support structure, the cross section of the horizontally arranged metal rod is rectangular, both ends of the horizontally arranged metal rod are clamped in the two card slots, the card slot structure and the horizontally arranged metal rod are in clearance fit, and anti-slip stripes are arranged on the surface of the card slots.

[0011] Preferably, threaded structures are respectively arranged at both ends of the horizontally arranged metal rod.

[0012] Preferably, a filamentous hydrophobic and oleophobic material is wound around the outer periphery of the longitudinally arranged metal rod.

[0013] Preferably, a protective cover is commonly arranged outside the hexagonal collection device, the top spraying device and the bottom atomizing device.

[0014] A purification method for the double-nozzle atomizing corona discharge oil fume purification device as described above includes the following steps: S1. Both ends of the horizontally arranged metal rod are respectively connected with a negative high-voltage electrostatic generator, and after being energized, the longitudinally arranged metal rod and the needle-shaped electrodes are charged; S2. Synchronously start the atomizing nozzle, and the atomizing nozzle sprays upward; S3. Introduce cooking fumes from the bottom atomizing device. The needle-shaped electrode generates corona discharge, causing the cooking fumes to be charged. The atomized droplets and the charged cooking fume particles combine to form aggregates, and the aggregates migrate and adsorb towards the hexagonal collecting device under the action of the electric field. S4. Maintain corona discharge to generate plasma to decompose residual oil stains.

[0015] Preferably, it includes the following steps: Start the cleaning liquid spray nozzle after the purification is completed, and the needle-shaped electrode continuously discharges.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention discloses a double-nozzle atomizing corona discharge cooking fume purification device, which includes a T-shaped discharge structure, an atomizing device, a hexagonal collecting device and a support structure. The T-shaped discharge structure is composed of a horizontally placed metal rod and a vertically placed metal rod, and is detachably connected to the hexagonal collecting device through the support structure; the vertically placed metal rod is provided with needle-shaped electrodes distributed in an alternating manner. The collecting device is set to be hexagonal, and there are three needle-shaped electrodes, which is convenient for the matching and installation of the angles of the needle-shaped electrodes. The atomizing device includes a large-flow spray nozzle at the top and a small-flow atomizing nozzle at the bottom, which are respectively used for self-cleaning and particle aggregation. After the cooking fumes enter from the bottom, the needle-shaped electrodes charge the particles through corona discharge and adsorb them to the grounded hexagonal collecting device; synchronously atomized droplets enhance the capture efficiency of small particles, and the plasma decomposes residual oil stains. After purification, the top sprays cleaning liquid to achieve self-cleaning of the inner wall and electrodes. Through the synergistic effect of corona discharge and double-nozzle atomization, the present invention solves the problems of low purification efficiency, frequent maintenance and high energy consumption in the traditional technology, and has the advantages of high-efficiency purification (cooking fume removal rate ≥ 85%, particulate matter removal rate ≥ 90%), energy conservation and environmental protection (energy consumption reduced by 30%), compact structure and easy maintenance, and is suitable for scenarios such as household kitchens and dining places.

[0017] Furthermore, in a group of needle-shaped electrodes, at the connection of two needle-shaped electrodes pointing to the vertical plate, one of them points to the opposite vertical plate, making the angles between the needle-shaped electrodes accurate and facilitating installation.

[0018] Furthermore, the upper and lower adjacent needle-shaped electrodes are arranged in an alternating manner. Each needle-shaped electrode in the next group is at the center point of the included angle between two needle-shaped electrodes in the previous group, so that the needle-shaped electrodes arranged along the length direction of the vertically placed metal rod can all be arranged in an alternating manner. The needle-shaped electrodes in every other group are arranged in the same direction, and the needles in the hexagonal collecting device point comprehensively and the discharge is uniform.

[0019] Furthermore, the horizontally placed metal rod of the T-shaped discharge structure is detachably connected through the opening structure of the card slot. The card slot and the hexagonal collecting device are in interference fit through a wedge-shaped card slot, making the disassembly and maintenance of the device more convenient. The needle-shaped electrodes on the vertically placed metal rod are covered with a filamentous hydrophobic and oleophobic material, reducing the dead zone of corona discharge for treating cooking fumes.

[0020] Furthermore, a card slot structure is provided on the support structure. The cross-sections of the horizontally arranged metal rod and the card slot structure are rectangular, enabling clearance fit for easy disassembly and installation. At the same time, anti-slip stripes are provided on the surface of the card slot to prevent the horizontally arranged metal rod from falling off the card slot.

[0021] Furthermore, a filamentous hydrophobic and oleophobic material is wound around the outer periphery of the metal rod to prevent oil contamination and reduce corona blockage.

[0022] The present invention also discloses a purification method for a double-nozzle atomizing corona discharge oil fume purification device. The oil fume particles are charged through corona discharge and migrate and adsorb to the grounded hexagonal collection device under the action of an electric field. At the same time, the bottom atomizing device is synchronously turned on when the corona discharge is started, and atomized droplets are sprayed upward to cover the hexagonal collection device and the area of the needle-shaped electrode, so that the atomized droplets combine with the charged oil fume particles to form aggregates, significantly enhancing the capture efficiency of small-sized particles. The high-energy particles generated by corona discharge can decompose the oil fume particles to achieve plasma purification, fundamentally cleaning the oil fume and avoiding the limitations of traditional purification devices that rely only on physical adsorption.

[0023] Furthermore, the combination of the atomized droplets and the oil fume particles endows the needle-shaped electrode with a self-cleaning function, reducing the accumulation of oil contamination on the electrode surface. After the purification is completed, the top spraying device sprays a cleaning liquid to wash the inner wall of the hexagonal collection device and the electrode surface, further reducing the frequency of manual cleaning and the maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural diagram of the double-nozzle atomizing corona discharge oil fume purification device of the present invention; Figure 2 It is a corona discharge structural diagram based on a T-shaped structure and a hexagonal collection device; Figure 3 It is a connection schematic diagram of the support structure and the hexagonal collection device; Figure 4 It is a structural diagram of the top spraying device; Figure 5 It is a structural diagram of the bottom atomizing device; Figure 6 It is an experimental data diagram of Example 1; Figure 7 It is an experimental data diagram of Example 2; Figure 8 It is an experimental data diagram of Example 3.

[0025] In the figure, 1 is a T-shaped discharge structure; 11 is a horizontally placed metal rod; 111 is a bolt; 12 is a vertically placed metal rod; 121 is a needle-shaped electrode; 122 is a filamentous hydrophobic and oleophobic material; 2 is an atomization device; 21 is a top spraying device; 211 is a cleaning liquid spraying nozzle; 212 is an upper oil fume duct; 22 is a bottom atomization device; 221 is an atomizing nozzle; 222 is a lower oil fume duct; 3 is a hexagonal collection device; 4 is a support structure; 41 is a card slot; 5 is a protective cover. Detailed implementation mode

[0026] The following further describes the present invention in detail with reference to the accompanying drawings: The embodiments of the present invention are described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0027] See Figure 1 , the present invention discloses a double-nozzle atomization corona discharge oil fume purification device, which includes a T-shaped discharge structure 1, an atomization device 2, a hexagonal collection device 3 and a support structure 4.

[0028] The transverse section of the hexagonal collection device 3 is hexagonal and is composed of six vertically arranged rectangular plates.

[0029] The upper end of the hexagonal collection device 3 is connected to the support structure 4. The T-shaped discharge structure 1 is installed on the support structure 4. The spray atomization device 2 includes a top spraying device 21 and a bottom atomization device 22, which are respectively fixed to the top air outlet and the bottom air inlet of the hexagonal collection device 3. The upper end of the top spraying device 21 is connected to the oil fume duct, and the lower end of the bottom atomization device 22 is connected to the suction duct. The support structure 4 and the top spraying device 21 are both connected to the top of the hexagonal collection device 3. The support structure 4 is inside the top spraying device 21. The spray atomization device 2, the support structure 4 and the hexagonal collection device 3 are coaxially arranged; the entire device is covered with a protective cover 5 on the outside. The top spraying device 21 protrudes from the upper end of the protective cover 5, and the bottom atomization device 22 protrudes from the lower end of the protective cover 5.

[0030] Multiple collection devices of the present invention can be provided in the oil fume machine. When multiple are provided, the hexagonal collection devices 3 are placed side by side and closely fit together to eliminate gaps and jointly remove oil fume; when multiple hexagonal collection devices 3 are provided, a common protective cover can be shared.

[0031] The hexagonal collection device 3 is made of stainless steel. As the electric field adsorption surface, after being grounded, it adsorbs charged oil fume particles, and at the same time collects atomized droplets and oil stains. It has a compact and simple structure and is suitable for various kitchen environments; the support structure 4 is made of acrylic plastic.

[0032] See Figure 2 , the T-shaped discharge structure 1 is composed of a horizontally placed metal rod 11 and a vertically placed metal rod 12. The materials of the horizontally placed metal rod 11 and the vertically placed metal rod 12 are both stainless steel; see Figure 3 , the support structure 4 is arranged at the upper end of the hexagonal collection device 3. The support structure 4 is also hexagonal in shape, so that it can match the hexagonal collection device 3. Two card slots 41 are opened at the upper end of the support structure 4. The card slots 41 are concave grooves, and the inner wall of the groove is provided with anti-slip stripes; the cross-sectional shape of the central part of the horizontally placed metal rod 11 is rectangular, and the two sides are circular. The size of the rectangle in the central part of the horizontally placed metal rod 11 is adapted to the width of the card slot 41 of the support structure 4, so that the horizontally placed metal rod 11 can be clamped in the card slot 41; external threads are provided on the outer sides of the circular cross-sectional parts of the horizontally placed metal rod 11 on both sides, and are fixed to the protective cover 5 through bolts 111. The two bolts 111 on both sides work together to enable the horizontally placed metal rod 11 to be fastened to the protective cover 5 and will not move horizontally. The two sides of the horizontally placed metal rod 11 are also used to connect to the negative high-voltage electrostatic generator. A threaded hole is provided in the middle of the horizontally placed metal rod 11, and the top end of the vertically placed metal rod 12 passes through the threaded hole and is connected to the horizontally placed metal rod 11; a vertical threaded hole is opened in the central part of the horizontally placed metal rod 11, and the vertical support rod 12 passes through the threaded hole and is threadedly connected to the horizontally placed metal rod 11. The horizontally placed metal rod 11 is detachably connected through the card slot 41 of the support structure 4.

[0033] In some embodiments of the present invention, the lower part of the support structure 4 is a wedge-shaped structure, which is convenient for interference fit with the hexagonal collection device 3 through the wedge-shaped structure. In some embodiments of the present invention, a plurality of groups of needle-shaped electrodes 121 are arranged at intervals on the axial surface of the vertically placed metal rod 12. Each group of needle-shaped electrodes has three. Exemplarily, there are 18 needle-shaped electrodes 121, which are divided into six groups. The material of the needle-shaped electrodes 121 is tungsten, and the direction of the needle-shaped electrodes 121 is perpendicular to the axis direction of the vertically placed metal rod 12; due to the small radius of curvature at the tip of the needle-shaped electrode, the electric field intensity is extremely high, and corona discharge can be effectively generated to charge the oil fume particles.

[0034] One group of needle-shaped electrodes 121 is arranged on a plane, and the included angle between every three needle-shaped electrodes 121 in each group is 120°, so that discharge can be carried out in different directions on one plane.

[0035] See Figure 2Furthermore, the arrangement directions of different groups of needle-shaped electrodes 121 are staggered along the axis of the vertical metal rod 12, that is, the upper and lower adjacent groups of needle-shaped electrodes 121 are staggered, and the arrangement directions of the needle-shaped electrodes 121 of the next group are the same; the angle between the vertical plane where any needle-shaped electrode 121 in the next group of needle-shaped electrodes 121 is located and the vertical plane where the two adjacent needle-shaped electrodes 121 in the previous group are located is 60°. This staggered arrangement allows the discharge area to evenly cover the hexagonal collection device.

[0036] The present invention sets the collecting device in a hexagonal shape. In each group of three needle electrodes 121, two needle electrodes 121 point to the connection with the vertical plate, and one needle electrode 121 points to the middle of a vertical plate. The design of the hexagonal collecting device 3 structure facilitates the alignment of the needle electrodes 121 during installation, which is conducive to uniform discharge.

[0037] In some embodiments of the present invention, the outer periphery of the longitudinal metal rod 12 is wrapped with a filamentary hydrophobic and oleophobic material 122 to completely cover the exposed portion of the longitudinal metal rod 12 to prevent oil stains from adhering and reduce corona occlusion.

[0038] like Figure 4 As shown, the top spray device 21 is used to spray the cleaning liquid, and the nozzle is directed toward the inner wall of the hexagonal collecting device 3 to flush the inner wall of the hexagonal collecting device 3. At the same time, part of the liquid will splash onto the surface of the needle-shaped electrode 121 to achieve self-cleaning. The top spray device 21 includes an upper range hood pipe 212 and a cleaning liquid spray nozzle 211. The cleaning liquid spray nozzle 211 is made of plastic and has a curved structure. It is inserted into the upper range hood pipe 212 laterally. The inlet is set on the outer side of the upper range hood pipe 212, and the outlet is set on the lower side of the upper range hood pipe 212. It is arranged vertically downward, that is, it is arranged parallel to the central axis of the hexagonal collecting device 3. Through the vertical arrangement, the large particle spray can be sprayed more evenly on the inner wall of the hexagonal collecting device 3 for flushing. The water output of the cleaning liquid spray nozzle 211 is a large flow rate, which can be 9000ml / h by way of example.

[0039] like Figure 5 As shown, the bottom atomizing device 22 includes a lower range hood pipe 222 and an atomizing nozzle 221. The atomizing nozzle 221 is made of plastic material, passes through and is fixed on the lower range hood pipe 222 in the horizontal direction, and the water outlet is toward the inside of the bottom atomizing device 22, which is a horizontal output. The water output is characterized by a small flow rate. For example, the small flow rate can be 360ml / h. The bottom atomizing device 22 is used to spray atomized droplets. During the oil fume adsorption process, the horizontally output spray can be directly driven by the wind to move upward, thereby covering the hexagonal collection device 3 and the needle electrode 121 area, thereby enhancing the particle capture efficiency.

[0040] In some embodiments of the present invention, both the cleaning liquid spray nozzle 211 and the atomizing nozzle 221 are made of plastic material, which is corrosion-resistant and easy to replace, and is suitable for the oil fume purification requirements under different working conditions.

[0041] Through the synergistic effect of corona discharge and atomization, the present invention can achieve efficient oil fume purification effect with low energy consumption. The small flow design of the bottom atomizing device reduces the consumption of water resources, and the large flow design of the top spraying device ensures the cleaning effect. The overall device realizes energy conservation and environmental protection while achieving efficient purification.

[0042] The protective cover 5 is made of acrylic plastic material and is placed outside all devices. It has good corrosion resistance and transparency, which is convenient for observing the operation status of the device.

[0043] A corona discharge oil fume purification method for the above device includes the following steps: S1. Connect the horizontally placed metal rod 11 to the negative high-voltage electrostatic generator to make the vertically placed metal rod 12 and the needle-shaped electrode 121 charged. S1. Synchronously start the bottom atomizing nozzle 221 to spray atomized droplets upward, and keep the cleaning liquid spray nozzle 211 closed. S2. Guide the oil fume to enter the hexagonal collection device 3 from the lower oil fume pipe 222. S3. Generate corona discharge through the needle-shaped electrode 121 to charge the oil fume particles. S4. The charged particles migrate and adsorb to the grounded hexagonal collection device 3 under the action of the electric field. S5. At the same time, a dynamic atomization film is continuously formed on the surface of the needle-shaped electrode 121 by supplying water mist. Under the action of the electric field, it flies at high speed around the needle-shaped electrode 121, effectively blocking the adhesion of oil droplets to the needle tip, realizing self-cleaning of the needle tip, and then decomposing the residual oil stains by plasma.

[0044] An atomization collaborative control method for the above device includes the following steps: S1. Synchronously start the bottom atomizing nozzle 221 when the corona discharge is started, and spray atomized droplets upward to cover the area of the hexagonal collection device 3 and the needle-shaped electrode 121. S2. Make the atomized droplets combine with the charged oil fume particles to form aggregates, enhancing the capture efficiency of small particle size particles. S3. After the purification is completed, close the bottom atomizing nozzle 221, switch to start the top curved atomizing nozzle 211, spray the cleaning liquid downward, and keep discharging at the same time. The discharge can release a large number of free electrons, high-energy particles, active groups and strongly oxidizing molecules to help clean the oil stains.

[0045] S4. Realize self-cleaning by flushing the inner wall of the hexagonal collection device 3 and the electrode surface with the atomized liquid flow.

[0046] The effectiveness of the oil fume removal effect of the present invention is described below through embodiments. An oil fume concentration measuring instrument is used to measure the oil fume concentration at the inlet and outlet of the oil fume machine pipeline 212 and the bottom oil fume machine pipeline 222 respectively to evaluate the oil fume treatment effect of the present invention.

[0047] Example 1 The present device is used for testing under typical working conditions in a household kitchen. The specific conditions are: oil fume temperature 150 °C, wind speed 3 m / s, and power supply voltage 16 kV. The test object is a double-nozzle atomized corona discharge oil fume purification device, and its oil fume removal efficiency and particulate matter removal effect are mainly evaluated. Figure 6 The change curves of the oil fume concentration removal rate and the particulate matter removal rate over time during 5 minutes of normal cooking in a household kitchen are shown. It can be seen from the figure that the oil fume concentration removal rate and the particulate matter removal rate change over time as follows: in the initial stage (the first 1 minute), the oil fume concentration is relatively high and the removal rate rises rapidly; after 1 minute, the oil fume concentration tends to be stable and the removal rate remains between 85% and 90%, and the particulate matter removal rate remains above 85% throughout the process. The test results show that the device can quickly respond to concentration changes in a conventional kitchen environment and achieve efficient purification through the synergistic effect of double-nozzle atomization and corona discharge.

[0048] Example 2 In this embodiment, the present device is tested under the alternating working conditions of high temperature and high concentration in a restaurant. The oil fume temperature is 200 °C, the wind speed is 5 m / s, and the power supply voltage is 20 kV, and the alternating operation of frying and stir-frying is simulated for 15 minutes. See Figure 7 , the test shows that the oil fume removal rate is stable between 85% and 92% during the rising stage. The device maintains a stable purification effect even when the oil fume concentration fluctuates violently by dynamically adjusting the atomization and corona parameters, verifying its strong adaptability to extremely high temperature and high concentration oil fume environments, and the particulate matter removal rate remains above 85% throughout the process.

[0049] Example 3 See Figure 3 , the present device is used on the cooking stove in a school cafeteria, configured with top spraying (160 ml / min) and bottom atomization (300 ml / min), the oil fume temperature is 180 °C, the wind speed is 4 m / s, and the power supply voltage is 18 kV, and the continuous operation during the lunch peak is simulated for 20 minutes. The test results show that the oil fume removal rate rapidly rises from 75% to 88.8% within the first 5 minutes and is stable between 86% and 93% within 20 minutes; the particulate matter removal rate remains above 80% throughout the process after rising in the initial stage, reaching a maximum of 94.9%. In addition, the energy consumption of the device for continuous operation for 1 hour is only 0.02 kw•h, which is significantly lower than 0.06 kw•h of similar devices. This embodiment verifies the high-efficiency purification ability and energy-saving advantages of the device in high-load and long-term operation scenarios, and is suitable for large-scale catering places such as school cafeterias.

[0050] The present invention provides a method for purifying cooking fumes by combining the coordinated atomization of a dual-nozzle and corona discharge, which solves the problems of low purification efficiency and incomplete particulate matter capture in traditional devices under high-concentration cooking fume conditions. Through the synergistic effect of the top spraying device and the bottom atomization device, combined with the strong electric field effect generated by corona discharge and the plasma purification effect, the particle size of the atomized droplets and the electric field strength can be precisely controlled, thereby achieving efficient capture of cooking fume particles with different concentrations and different particle sizes. Through experimental verification, the cooking fume removal rate of this device is stable above 85% and the particulate matter removal rate reaches above 90% under high-temperature and high-wind-speed conditions, significantly improving the cooking fume purification effect, and it is applicable to various scenarios such as household kitchens, restaurants, and school canteens.

[0051] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more. In the description of the present invention, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the case where the first and second features are not in direct contact but in contact through other features therebetween.

[0052] In the description of the present invention, the first feature being "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature has a higher horizontal height than the second feature.

[0053] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0054] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0055] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

[0056] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A double-nozzle atomizing corona discharge fume purification device, characterized in that, It includes a hexagonal collecting device (3) with both ends open. The upper end of the hexagonal collecting device (3) is connected to a coaxial top spraying device (21) and a support structure (4). The support structure (4) is inside the top spraying device (21). The lower end of the hexagonal collecting device (3) is connected to a bottom atomizing device (22). The hexagonal collecting device (3) is grounded. The support structure (4) is detachably connected to a horizontally placed metal rod (11). The horizontally placed metal rod (11) is connected to a vertical longitudinally placed metal rod (12). The longitudinally placed metal rod (12) is inserted into the hexagonal collecting device (3). Multiple groups of needle-shaped electrodes (121) are distributed on the longitudinally placed metal rod (12). The multiple groups of needle-shaped electrodes (121) are arranged in a staggered array along the length direction on the longitudinally placed metal rod (12). The needle-shaped electrodes (121) are perpendicular to the longitudinally placed metal rod (12). Each group of needle-shaped electrodes (121) has three needle-shaped electrodes (121). A cleaning liquid spraying nozzle (211) is arranged in the top spraying device (21). The outlet of the cleaning liquid spraying nozzle (211) faces the hexagonal collecting device (3), and the inlet is connected to a cleaning liquid. An atomizing nozzle (221) is arranged in the bottom atomizing device (22). The inlet of the atomizing nozzle (221) is connected to water, and the outlet faces the inside of the bottom atomizing device (22). The upper end of the top spraying device (21) is connected to the exhaust duct of an oil fume machine, and the lower end of the bottom atomizing device (22) is connected to the exhaust duct of the oil fume machine.

2. The double-nozzle atomizing corona discharge oil fume purification device according to claim 1, characterized in that, The hexagonal collecting device (3) is composed of six adjacent vertical plates connected in sequence. Among the three needle-shaped electrodes (121) in each group, two needle-shaped electrodes (121) point to the connection part with the vertical plate, and one needle-shaped electrode (121) points to the middle of a vertical plate. Among a group of needle-shaped electrodes (121), the included angle between any two adjacent needle-shaped electrodes (121) is 120°.

3. The double-nozzle atomizing corona discharge fume purification device according to claim 1, characterized in that The included angle between any one needle-shaped electrode (121) in the next group of needle-shaped electrodes (121) and the two needle-shaped electrodes (121) in the previous group is 60°.

4. A double-nozzle atomizing corona discharge fume purification device according to claim 1, characterized in that, The lower end of the support structure (4) is a wedge-shaped structure, and the lower end of the support structure (4) and the hexagonal collecting device (3) are in interference fit.

5. The double-nozzle atomizing corona discharge oil fume purification device according to claim 1, characterized in that, Two clamping grooves (41) are opened at the upper end of the support structure (4). The cross-section of the horizontally placed metal rod (11) is rectangular. The two ends of the horizontally placed metal rod (11) are clamped in the two clamping grooves (41). The clamping grooves (41) and the horizontally placed metal rod (11) are in clearance fit, and anti-slip stripes are arranged on the surface of the clamping grooves (41).

6. The dual-nozzle atomized corona discharge fume purification device according to claim 1, characterized in that, Threaded structures are respectively arranged at both ends of the horizontally placed metal rod (11).

7. The double-nozzle atomizing corona discharge oil fume purification device according to claim 1, characterized in that A filamentous hydrophobic and oleophobic material (122) is wound around the outer periphery of the longitudinally placed metal rod (12).

8. A double-nozzle atomizing corona discharge fume purification device according to claim 1, characterized in that, A protective cover (5) is commonly arranged outside the hexagonal collecting device (3), the top spraying device (21) and the bottom atomizing device (22).

9. A purification method for the double-nozzle atomizing corona discharge fume purification device according to claim 1, characterized in that, It includes the following steps: S1. The two ends of the horizontally placed metal rod (11) are respectively connected to a negative high-voltage electrostatic generator. After being powered on, the longitudinally placed metal rod (12) and the needle-shaped electrodes (121) are charged. S2, simultaneously start the atomizing nozzle (221), and the atomizing nozzle (221) sprays upward; S3, introduce oil fume from the bottom atomizing device (22), the needle-shaped electrode (121) generates corona discharge to charge the oil fume, the atomized droplets and the charged oil fume particles combine to form aggregates, and the aggregates migrate and adsorb towards the hexagonal collecting device (3) under the action of the electric field; S4, maintain corona discharge to generate plasma to decompose residual oil stains.

10. The purification method according to claim 9, characterized in that, It includes the following steps: start the cleaning liquid spray nozzle (211) after the purification ends, and the needle-shaped electrode (121) continuously discharges.

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