Oil fume filtration device

Abstract

This invention belongs to the field of oil fume treatment technology, specifically an oil fume filtration device. It includes a filtration chamber with an upper support plate and a lower support plate. Between the upper and lower support plates are a turntable, a filtration station, a discharge station, and a feeding station. Filter cylinders are mounted on the turntables at each of the filtration, discharge, and feeding stations. The upper end of each filter cylinder slides with the upper support plate, and the lower end slides with the lower support plate. An air inlet pipe is connected to the lower support plate of the filtration station, and an exhaust pipe is connected to the upper support plate. A discharge port is located on the lower support plate of the discharge station, and a feeding port is located on the upper support plate of the feeding station. Multiple filter balls are arranged inside the filter cylinders. From the inside out, each filter ball consists of a substrate, a porous adsorption and thermal catalytic layer, and a porous photothermal catalytic layer. A photothermal catalytic mechanism is located between the discharge port and the feeding port. This invention features low operating noise, convenient maintenance, and better oil fume filtration performance.

Description

Technical Field

[0001] This invention belongs to the field of oil fume treatment technology, and in particular to an oil fume filtration device. Background Technology

[0002] During the cooking of hot pot broth and other foods, a large amount of high-temperature oil fumes are generated. These fumes contain numerous pollutants and need to be treated before being released. Common methods for treating these fumes include filtration, primarily using metal mesh / labyrinth filters and electrostatic filters. However, these filters have high resistance, making it difficult to remove VOCs (volatile organic compounds), and they are prone to clogging, requiring frequent cleaning or replacement, which is inconvenient. Electrostatic filters also require frequent cleaning of the plates, making maintenance inconvenient, and they pose a higher fire risk. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an oil fume filtration device that can effectively remove VOCs and is easier to maintain.

[0004] To solve the above problems, the technical solution adopted by the present invention is as follows: an oil fume filtration device, including a filtration chamber, in which a horizontal upper support plate and a horizontal lower support plate are fixedly installed. A turntable is provided between the upper and lower support plates. The turntable is connected to a rotation drive mechanism. A filtration station, a discharge station, and a feeding station are arranged sequentially along the rotation direction of the turntable. A filter cylinder penetrating the turntable is provided on the turntable of each of the filtration station, discharge station, and feeding station. Both ends of the filter cylinder are open, and the upper end of the filter cylinder is slidably engaged with the upper support plate, and the lower end of the filter cylinder is slidably engaged with the lower support plate. An air inlet pipe is connected to the lower support plate of the filtration station, and an exhaust pipe is connected to the upper support plate of the filtration station. A discharge port communicating with the lower end of the filter cylinder is provided on the lower support plate of the discharge station, and a feeding port communicating with the upper end of the filter cylinder is provided on the upper support plate of the feeding station.

[0005] The filter cylinder is provided with a filter media layer, which includes multiple filter balls. The filter balls, from the inside to the outside, are a matrix, a porous adsorption and thermal catalysis layer, and a porous photothermal catalysis layer.

[0006] A photothermal catalytic mechanism is installed below the discharge port.

[0007] Furthermore, the substrate is a porous ceramic, and the porous adsorption and thermal catalytic layer includes an adsorbent and a thermal catalyst. The adsorbent is activated carbon fiber or graphene aerogel, and the thermal catalyst is MnO2-CeO2 composite oxide. The porous photothermal catalytic layer is oxygen-deficient titanium dioxide.

[0008] Furthermore, the photothermal catalytic mechanism includes a receiving tray, one end of which is hinged to the inner side wall of the filter chamber, and the other end is hinged to a telescopic mechanism; an ultraviolet lamp is installed above the receiving tray, and the irradiation intensity of the ultraviolet lamp is ≥100 mW / cm²; one end of the receiving tray is connected to an inclined discharge trough.

[0009] Furthermore, the fume filtration device also includes a mixing pipe and a vortex pipe. The mixing pipe has a first air inlet pipe, a second air inlet pipe, and a coagulant spray pipe on its side wall. The centerlines of the first air inlet pipe, the second air inlet pipe, and the coagulant spray pipe intersect at the center of the mixing pipe. The first air inlet pipe and the second air inlet pipe are connected to a main air inlet pipe. One end of the mixing pipe is sealed, and the other end is connected to the air inlet of the vortex pipe. The coagulant spray pipe is connected to the cold end pipe of the vortex pipe, and a coagulant adding mechanism is provided on the coagulant spray pipe. An oil collection box is provided on the outer wall of the hot end of the vortex pipe. The oil collection box is connected to the vortex chamber of the vortex pipe through an oil collection hole. The hot end pipe of the vortex chamber is connected to the air inlet pipe.

[0010] Furthermore, the coagulant addition mechanism includes an atomizing nozzle and a coagulant storage container. The atomizing nozzle is installed on the side wall of the coagulant spray pipe, and the spray direction of the atomizing nozzle is towards the inside of the coagulant spray pipe. The atomizing nozzle is connected to the coagulant storage container through a delivery pump, and the coagulant storage container stores the coagulant.

[0011] Furthermore, the coagulant is a hydrofluoroether compound with a boiling point of 40-80℃.

[0012] Furthermore, the nozzle of the vortex tube is connected to an air compressor.

[0013] Furthermore, the first air intake pipe, the second air intake pipe, and the coagulant spray nozzle are all Venturi tubes.

[0014] Furthermore, the exhaust pipe is connected to an air intake mechanism.

[0015] The beneficial effects of the present invention are: 1. The filter media layer inside the filter cylinder is columnar, which can trap solid particles and oil in the oil fume, and the porous adsorption and thermal catalytic layer and the porous photothermal catalytic layer on the surface of each filter ball are all porous materials with high specific surface area, which can adsorb gaseous pollutants such as VOCs in the oil fume and improve the filtration effect of the oil fume.

[0016] 2. Using spherical filter balls as filter media instead of traditional filter screens results in lower resistance and lower noise.

[0017] 3. Once the filter media layer at the filtration station reaches saturation, it can be moved to the discharge station via a turntable. The filter media in the filter cartridge then falls downwards through the discharge port into the photothermal catalytic mechanism. After treatment by the photothermal catalytic mechanism, the oil droplets adhering to the filter media and the adsorbed organic gases are fully catalytically decomposed. The filter media can then be put back into the filter cartridge for recycling. This process eliminates the need for manual cleaning of the filter media, making subsequent maintenance more convenient. The filter media can be recycled multiple times; when the pores of the porous photothermal catalytic layer become clogged with solid particles, it can be replaced with new filter media. Attached Figure Description

[0018] Figure 1 This is an overall schematic diagram of the oil fume filtration device of the present invention;

[0019] Figure 2 yes Figure 1 Schematic diagram of the AA section;

[0020] Figure 3 yes Figure 2 Schematic diagram of the BB section;

[0021] Figure 4 This is a cross-sectional schematic diagram of the mixing pipe;

[0022] Reference numerals: 1—Filter chamber; 2—Upper support plate; 3—Lower support plate; 4—Turntable; 5—Rotation drive mechanism; 6—Filter cylinder; 7—Inlet pipe; 8—Exhaust pipe; 9—Discharge port; 10—Inlet; 11—Filter media layer; 12—Receiving tray; 13—Telescopic mechanism; 15—Ultraviolet lamp; 16—Discharge trough; 18—Mixing pipe; 19—First inlet pipe; 20—Second inlet pipe; 21—Coagulant spray pipe; 22—Main inlet pipe; 23—Vortex chamber; 24—Inlet; 25—Cold end pipe; 26—Coagulant addition mechanism; 261—Atomizing nozzle; 262—Coagulant storage container; 263—Transfer pump; 27—Oil collection box; 28—Oil collection hole; 29—Hot end pipe; 31—Nozzle; 32—Air compressor; 33—Suction mechanism. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] The oil fume filtration device of the present invention, such as Figures 1 to 4 As shown, the filter includes a filter chamber 1, which is vertically arranged and can be rectangular or cylindrical. A horizontal upper support plate 2 and a horizontal lower support plate 3 are fixedly installed inside the filter chamber 1. The edges of the upper support plate 2 and the lower support plate 3 can be bolted to the inner wall of the filter chamber 1, and there is a gap between the upper support plate 2 and the lower support plate 3.

[0025] A turntable 4 is disposed between the upper support plate 2 and the lower support plate 3. The turntable 4 is a disc and is rotatably mounted between the upper support plate 2 and the lower support plate 3. The turntable 4 is connected to a rotation drive mechanism 5, which can be a geared motor, capable of driving the turntable 4 to rotate at a uniform speed. Inside the filter chamber 1, a filtration station, a discharge station, and a feeding station are arranged sequentially along the rotation direction of the turntable 4. Each of the filtration station, discharge station, and feeding station has a filter cylinder 6 that penetrates the turntable 4. The filter cylinder 6 is a vertically arranged metal cylinder with open ends. The upper end of the filter cylinder 6 is slidably fitted with the upper support plate 2, and the lower end of the filter cylinder 6 is slidably fitted with the lower support plate 3. Sealing gaskets can be placed at the upper and lower ends of the filter cylinder 6 to ensure the sealing of the two ends of the filter cylinder 6 and prevent oil fumes from leaking from the two ends of the filter cylinder 6 during the filtration process.

[0026] The lower support plate 3 of the filtration station is connected to an air inlet pipe 7, which communicates with the lower end of the filter cylinder 6 of the filtration station to allow oil fumes to enter the filter cylinder 6. The upper support plate 2 of the filtration station is connected to an exhaust pipe 8, which communicates with the upper end of the filter cylinder 6 of the filtration station to discharge the filtered oil fumes. The lower support plate 3 of the discharge station is provided with a discharge port 9, which communicates with the lower end of the filter cylinder 6 of the discharge station, allowing the filter material inside the filter cylinder 6 to be discharged through the discharge port 9. The upper support plate 2 of the feeding station is provided with a feeding port 10, which communicates with the upper end of the filter cylinder 6 of the feeding station, for loading the filter material into the filter cylinder 6.

[0027] When the turntable 4 rotates, it can sequentially transport each filter cylinder 6 to the filtration station, the discharge station and the feeding station.

[0028] The filter cartridge 6 contains a filter media layer 11, which includes multiple filter balls. From the inside out, the filter balls consist of a substrate, a porous adsorption and thermal catalytic layer, and a porous photothermal catalytic layer. The substrate is an irregularly shaped sphere made of a lightweight, high-porosity, and high-temperature-resistant material, such as porous ceramic particles. The porous adsorption and thermal catalytic layer includes an adsorbent and a thermal catalyst, which are loaded into micron-sized pores on the substrate surface. The adsorbent rapidly adsorbs organic molecules and odors from the cooking fumes, enriching reactants for the catalytic reaction and playing a major adsorption role. The thermal catalyst, upon heating, promotes the decomposition of organic molecules and oil droplets into carbon dioxide and water. The porous photothermal catalytic layer is a black, broadband-response photothermal catalyst. Also a porous material, it adsorbs pollutants from the cooking fumes. Furthermore, under ultraviolet light irradiation, the photothermal catalyst generates highly oxidizing free radicals, which decompose oil stains. In addition, the porous photothermal catalytic layer can heat up under light, thereby promoting the heating of the porous adsorption and thermal catalytic layer, which enables the thermal catalyst in the porous adsorption and thermal catalytic layer to heat up rapidly, promoting the decomposition of pollutants adsorbed by the porous adsorption and thermal catalytic layer.

[0029] Specifically, the adsorbent in the porous adsorption and thermocatalytic layer is activated carbon fiber, and the thermocatalyst is a MnO2-CeO2 composite oxide with a thickness of 20-50 μm; the porous photothermal catalytic layer is oxygen-deficient titanium dioxide with a thickness of 0.5-4 μm. MnO2 exhibits good low-temperature catalytic activity, while CeO2 can store oxygen under oxygen-rich conditions and release active oxygen species under oxygen-deficient conditions, thus improving the overall performance of the catalyst. After absorbing light energy, the oxygen-deficient titanium dioxide can raise the surface temperature of the filter ball to 200-400℃, promoting the catalytic reaction of the MnO2-CeO2 composite oxide.

[0030] In the preparation process, porous ceramic materials are first sintered into irregular spheres. Then, activated carbon fibers are crushed and mixed with a catalyst precursor solution (such as a mixed aqueous solution of potassium permanganate and cerium ammonium nitrate), and a small amount of binder (such as silica sol) is added. After stirring evenly, the dried ceramic particles are placed into the above mixed solution and soaked in a vacuum environment for 4-6 hours. The slurry rich in activated carbon fibers and catalyst ions enters the pores on the surface of the ceramic particles. Then, the ceramic particles are taken out and dried, and calcined at 300-500℃. The catalyst precursor decomposes into metal oxide nanoparticles and firmly adheres to the surface of activated carbon fibers and ceramic particles.

[0031] Next, titanium dioxide nanoparticles can be deposited on the surface of ceramic particles using vapor deposition. Then, the ceramic particles are placed in a thermal reduction furnace, hydrogen is introduced into the furnace, and the temperature is maintained at 350-500℃ for 1-3 hours. Conventional white titanium dioxide is converted into black oxygen-deficient titanium dioxide.

[0032] Finally, the catalyst is heat-treated in flowing air at 300-400℃ for 1-2 hours to complete the activation of the catalyst, ensure that the catalyst surface is in the optimal oxidation state, has abundant active sites, and stabilizes the crystal structure of the material.

[0033] A photothermal catalytic mechanism is installed below the discharge port 9. By providing a photothermal environment, it promotes the decomposition of adsorbed oil droplets and organic gases by the porous adsorption and thermal catalytic layer and the porous photothermal catalytic layer.

[0034] In this invention, the oil fumes enter the filter cylinder 6 of the filtration station through the air inlet pipe 7 and flow upward. The filter material layer 11 filters the oil fumes and adsorbs the tiny particles and organic gases in the oil fumes. The filtered oil fumes are discharged through the exhaust pipe 8.

[0035] When the fumes pass through the filter media layer 11 composed of filter balls, they can fully contact the surface of the filter balls. Larger oil droplets and solid particles are intercepted by the channels between the filter balls and the surface of the filter balls due to collision and sieving, achieving primary interception. Smaller aerosols and organic gases in the fumes are strongly adsorbed by the porous adsorption and thermal catalytic layer, achieving secondary adsorption. Due to the high temperature of the fumes, the thermal catalyst in the porous adsorption and thermal catalytic layer can be activated to trigger an oxidation reaction, decomposing the adsorbed organic pollutants into harmless carbon dioxide and water, achieving tertiary degradation and self-cleaning of the filter media.

[0036] After running for a period of time, the rotary drive mechanism 5 drives the turntable 4 to rotate at a set angle, transporting the filter cylinder 6 of the filtration station to the discharge station. The lower end of the filter cylinder 6 is connected to the discharge port 9. The filter material in the filter cylinder 6 falls into the photothermal catalytic mechanism under the action of gravity. After being processed by the photothermal catalytic mechanism, the organic pollutants on the surface of the filter material are decomposed. Then, the turntable 4 transports the filter cylinder 6 to the feeding station, and the processed filter material is put back into the feeding port 10. The filter material re-enters the filter cylinder 6, realizing recycling.

[0037] The filter cylinder 6 at the filtration station contains a filter media layer 11; the filter media layer 11 in the filter cylinder 6 at the discharge station falls into the photothermal catalytic mechanism, and there is no filter media layer 11 in the filter cylinder 6 at this station; when the photothermal catalytic mechanism processes the filter balls, there is no filter media layer 11 in the filter cylinder 6 at the feeding station; after the photothermal catalytic mechanism processes the filter balls, it loads the processed filter balls into the filter cylinder 6 at the feeding station, and the filter cylinder 6 at the feeding station contains a filter media layer 11.

[0038] Each filter cartridge 6 moves to the filtration station in turn to work. When the photothermal catalytic mechanism processes the filter material, the filtration device can work normally without stopping.

[0039] As can be seen, this invention can remove tiny oil droplets and gas molecules, resulting in better oil fume filtration. It also enables automated cleaning of the filter media, reducing manual labor and making maintenance more convenient. Furthermore, compared to the filter pores of traditional filters, the spacing between the filter balls is larger, resulting in lower air resistance and thus reducing operating noise.

[0040] The optimal catalytic temperature for the MnO2-CeO2 composite oxide is 250-400℃. At this temperature, the decomposition rate of organic matter can reach 90%. A heating mechanism can be installed in the photothermal catalytic mechanism to heat the filter balls to 250-400℃. In a more preferred embodiment, the photothermal catalytic mechanism includes a receiving tray 12. One end of the receiving tray 12 is hinged to the inner wall of the filter chamber 1, and the other end is hinged to a telescopic mechanism 13. The telescopic mechanism 13 can be a cylinder, linear motor, or other reciprocating telescopic device. An ultraviolet lamp 15 is installed above the receiving tray 12. The irradiation intensity of the ultraviolet lamp 15 is ≥100 mW / cm², and the wavelength is approximately 365nm or 254nm. One end of the receiving tray 12 is connected to an inclined discharge trough 16.

[0041] After the filter cartridge 6 moves to the discharge station, the filter balls inside fall into the receiving tray 12. Because the filter balls are spherical, they are difficult to stack and instead disperse on the receiving tray 12. An inclined baffle is provided at the edge of the receiving tray 12 to prevent the filter balls from falling off. Next, the ultraviolet lamp 15 emits ultraviolet light with an intensity of 100 mW / cm² onto the receiving tray 12. Under this intensity of ultraviolet light, the oxygen-deficient titanium dioxide can rapidly heat to 200-400℃, reaching the optimal catalytic temperature for the MnO2-CeO2 composite oxide, causing the small particulate organic matter adsorbed by the activated carbon fiber to decompose rapidly into carbon dioxide and water. During the photocatalytic process, the telescopic mechanism 13 continuously rotates the receiving tray 12 up and down, causing the filter balls on the receiving tray 12 to continuously roll, ensuring that the ultraviolet light can irradiate the entire surface of the filter balls. The rotation amplitude of the receiving tray 12 should not be too large to prevent the filter balls from prematurely entering the discharge trough 16. After the photocatalytic treatment reaches the set time, the telescopic mechanism 13 drives the receiving tray 12 to rotate upward to a certain angle, and the filter balls in the receiving tray 12 roll downward along the receiving tray 12 into the discharge trough 16, and then are discharged along the discharge trough 16. The filter balls can be collected by a container, and the collected filter balls can be put back into the filter cylinder 6 through the feed port 10.

[0042] In this invention, organic matter can be decomposed simply by irradiating the filter ball with light, eliminating the need for a heating mechanism and simplifying the structure of the photothermal catalytic mechanism.

[0043] Because cooking fumes contain a large number of solid particles, the porous adsorption and thermal catalytic layer and the porous photothermal catalytic layer can decompose gaseous and liquid organic matter, but cannot decompose particles. Therefore, as the usage time increases, solid particles will gradually clog the pores of the porous adsorption and thermal catalytic layer and the porous photothermal catalytic layer, affecting the service life of the filter balls.

[0044] In order to extend the service life of the filter ball, the present invention first pre-treats the oil fume to remove large particulate solid and liquid components in the oil fume. The filter layer 11 only needs to remove residual small particulate components and gaseous organic matter, thereby reducing the load on the filter layer 11 and extending the service life of the filter layer 11.

[0045] Specifically, the present invention also includes a mixing pipe 18 and a vortex pipe. The sidewall of the mixing pipe 18 is provided with a first air inlet pipe 19, a second air inlet pipe 20, and a coagulant spray pipe 21. The centerlines of the first air inlet pipe 19, the second air inlet pipe 20, and the coagulant spray pipe 21 intersect at the center of the mixing pipe 18. The first air inlet pipe 19 and the second air inlet pipe 20 are connected to an air intake manifold 22. One end of the mixing pipe 18 is sealed, and the other end is connected to the air inlet 24 of the vortex pipe. The coagulant spray pipe 21 is connected to the cold end pipe 25 of the vortex pipe, and a coagulant adding mechanism 26 is provided on the coagulant spray pipe 21 for adding coagulant to the coagulant spray pipe 21. An oil collection box 27 is provided on the outer wall of the hot end of the vortex pipe. The oil collection box 27 is connected to the vortex chamber 23 of the vortex pipe through an oil collection hole 28. The hot end pipe 29 of the vortex chamber 23 is connected to the air inlet pipe 7.

[0046] The fumes move through the main intake pipe 22 to the first intake pipe 19 and the second intake pipe 20, and then disperse into two streams. The two streams of fumes enter the mixing pipe 18 through the first intake pipe 19 and the second intake pipe 20, respectively. At the same time, the gas carrying the coagulant enters the mixing pipe 18 through the coagulant spray pipe 21. The angle between the first intake pipe 19 and the second intake pipe 20 is 120°, the angle between the first intake pipe 19 and the coagulant spray pipe 21 is 120°, and the angle between the second intake pipe 20 and the coagulant spray pipe 21 is also 120°. The two streams of fumes and the gas carrying the coagulant meet and collide fully at the center of the mixing pipe 18. The coagulant acts as a condensation nucleus, and the high-temperature oil vapor condenses on the surface of the coagulant, causing the volume of the coagulant to increase rapidly. At the same time, when the oil droplets in the fumes come into contact with the coagulant, they aggregate together to form larger oil droplets.

[0047] A vortex tube is a commonly used refrigeration device. A typical vortex tube usually includes a vortex chamber 23, with nozzles 31 mounted on the side wall of the vortex chamber 23. One end of the vortex chamber 23 has a hot-end tube 29, and the other end has a cold-end tube 25. In use, compressed gas is introduced into the vortex chamber 23 through the nozzles 31. The gas forms a high-speed rotating vortex in the vortex chamber 23. The gas temperature decreases in the vortex chamber 23 and is discharged through the cold-end tube 25, while the gas temperature increases near the inner wall of the vortex chamber 23 and is discharged through the hot-end tube 29.

[0048] This invention utilizes the high-speed vortex generation characteristic of vortex tubes. When oil fumes are introduced into the vortex tube, it rotates at high speed, generating strong centrifugal force. This force causes larger solid and liquid particles in the oil fumes to move to the inner wall of the vortex chamber 23. Driven by the hot airflow, they flow towards the hot end pipe 29. When the solid and liquid particles reach the oil collection box 27, they enter the oil collection box 27 through the oil collection hole 28, achieving the separation of large solid and liquid particles in the oil fumes. Compared with traditional centrifugal separators, the internal structure of the vortex tube is simpler, eliminating the need for an internal power mechanism and thus avoiding frequent cleaning of the power mechanism due to oil residue adhering to it. Furthermore, because the airflow temperature on the inner wall of the vortex chamber 23 is higher than that at the center, the temperature of the inner wall of the vortex chamber 23 is also higher. The oil residue moving to the inner wall of the vortex chamber 23 by centrifugal force is also relatively hot. This high-temperature oil residue has better fluidity and can easily flow with the hot airflow to the oil collection hole 28, significantly reducing the amount of oil residue adhering to the inner wall of the vortex chamber 23. The service life of vortex tubes is much longer than that of traditional centrifugal separators, and the maintenance frequency is much lower than that of traditional centrifugal separators.

[0049] Oil fumes can be compressed and then introduced into the vortex chamber 23 through nozzle 31. However, oil and other contaminants in the fumes tend to adhere to the internal components of the compression equipment and are difficult to clean. Therefore, as a preferred embodiment, this invention adds an air inlet 24 to the side wall of the vortex chamber 23 based on the traditional vortex tube. Oil fumes can enter the vortex chamber 23 through the air inlet 24. At the same time, a small air compressor 32 is provided. The nozzle 31 of the vortex tube is connected to the air compressor 32. The air compressor 32 compresses the external air and then introduces it into the vortex chamber 23 through the nozzle 31 to form a high-speed jet. A strong negative pressure is generated in the vortex chamber 23, thereby attracting oil fumes and causing the oil fumes to rotate at high speed.

[0050] As can be seen, the vortex tube of the present invention can be made by adding an air inlet 24 and an oil collection box 27 to the traditional vortex tube.

[0051] The fumes discharged from the hot end pipe 29 contain only small solid and liquid particles and organic gases. They are introduced into the filter cartridge 6 of the filtration station through the air inlet pipe 7, where the filter media layer 11 filters the fumes. After pretreatment and filtration, most of the solid, liquid, and gaseous pollutants in the fumes can be eliminated, and the treated fumes can be directly discharged into the atmosphere.

[0052] The temperature of the oil fume discharged from the cold end pipe 25 is lower than that of the initial oil fume. It is then transported to the mixing pipe 18 through the coagulant spray pipe 21, which can reduce the temperature of the initial oil fume and promote the condensation of vapor in the oil fume.

[0053] The coagulant can be environmentally friendly solid particles, etc. As a preferred embodiment, the coagulant is a hydrofluoroether compound with a boiling point of 40-80℃, which is liquid at room temperature. The initial temperature of the cooking fumes is typically above 100℃. Upon contact with the cooking fumes, the low-boiling-point liquid coagulant causes the hydrofluoroether compound to absorb a large amount of heat and vaporize violently, thus forming a localized low-temperature zone at the gas mixing point. In this low-temperature zone, gaseous oil molecules in the cooking fumes rapidly condense and liquefy on the surface of the unvaporized hydrofluoroether compound. The coagulant of this invention not only acts as a condensation nucleus but also actively generates a low-temperature zone, increasing the liquefaction rate and amount of gaseous oil. Furthermore, hydrofluoroether compounds are environmentally friendly cleaning agents and do not cause environmental pollution.

[0054] Hydrofluoroether compounds are liquid at room temperature. Therefore, the coagulant addition mechanism 26 includes an atomizing nozzle 261 and a coagulant storage container 262. The atomizing nozzle 261 is installed on the side wall of the coagulant spray pipe 21, and the spray direction of the atomizing nozzle 261 is towards the inside of the coagulant spray pipe 21. The atomizing nozzle 261 is connected to the coagulant storage container 262 through a delivery pump 263, and the coagulant storage container 262 stores the coagulant. The delivery pump 263 delivers the coagulant to the atomizing nozzle 261. After being atomized by the atomizing nozzle 261, the coagulant enters the coagulant spray pipe 21 and moves with the low-temperature oil fume into the mixing pipe 18, where it collides with the initial oil fume, promoting the solidification of liquid oil and the aggregation of liquid oil droplets.

[0055] The first air inlet pipe 19, the second air inlet pipe 20, and the coagulant spray pipe 21 are all Venturi tubes. The initial oil fume and low-temperature oil fume enter the mixing pipe 18 through the throat of the Venturi tube, which can increase the gas flow rate and promote the irregular movement of the airflow after collision, so that the coagulant can fully contact the solid and liquid particles in the oil fume.

[0056] The exhaust pipe 8 is connected to the suction mechanism 33, which can be an air pump or the like, to provide power for the flow of oil fumes.

[0057] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An oil fume filtering device, characterized in that: The utility model provides a filter device, including filter room (1), the horizontal upper support plate (2) and horizontal lower support plate (3) are fixedly arranged in filter room (1), be provided with rotary table (4) between upper support plate (2) and lower support plate (3), rotary table (4) is connected with rotary drive mechanism (5), and filter station, discharge station and feeding station are sequentially arranged along the rotary direction of rotary table (4), and the rotary table (4) of filter station, discharge station and feeding station is all provided with filter cylinder (6) that penetrates rotary table (4), the both ends of filter cylinder (6) are open, and the upper port of filter cylinder (6) is with upper support plate (2) sliding fit, and the lower port of filter cylinder (6) is with lower support plate (3) sliding fit, the lower support plate (3) of filter station is connected with air inlet pipe (7), and the upper support plate (2) of filter station is connected with exhaust pipe (8), and the lower support plate (3) of discharge station is provided with discharge port (9) that communicates with the lower port of filter cylinder (6), and the upper support plate (2) of feeding station is provided with feeding port (10) that communicates with the upper port of filter cylinder (6), The filter cylinder (6) is provided with a filter layer (11) therein, the filter layer (11) comprises a plurality of filter balls, the filter balls sequentially comprise a base body, a porous adsorption and thermal catalyst layer, and a porous photo-thermal catalyst layer from inside to outside. The discharge port (9) is provided below with a photo-thermal catalyst mechanism. It also includes a mixing pipe (18) and a vortex pipe, the side wall of the mixing pipe (18) is provided with a first air inlet pipe (19), a second air inlet pipe (20), and a coagulant injection pipe (21), the center lines of the first air inlet pipe (19), the second air inlet pipe (20), and the coagulant injection pipe (21) intersect at the center of the mixing pipe (18); the first air inlet pipe (19) and the second air inlet pipe (20) are connected with an air inlet main pipe (22), one end of the mixing pipe (18) is sealed, and the other end is connected with an air inlet (24) of the vortex pipe; the coagulant injection pipe (21) is connected with a cold end pipe (25) of the vortex pipe, and a coagulant adding mechanism (26) is arranged on the coagulant injection pipe (21); an oil collecting box (27) is arranged on the outer wall of the hot end of the vortex pipe, and the oil collecting box (27) is in communication with a vortex chamber (23) of the vortex pipe through an oil collecting hole (28); a hot end pipe (29) of the vortex chamber (23) is connected with the air inlet pipe (7).

2. The oil fume filtering device according to claim 1, wherein: The base body is a porous ceramic, the porous adsorption and thermal catalyst layer includes an adsorbent and a thermal catalyst, the adsorbent is activated carbon fiber, and the thermal catalyst is MnO2-CeO2 composite oxide; the porous photo-thermal catalyst layer is an oxygen-deficient titanium dioxide.

3. The oil fume filtering device according to claim 2, characterized in that: The photo-thermal catalyst mechanism includes a receiving tray (12), one end of the receiving tray (12) is hinged to the inner side wall of the filter chamber (1), the other end is hinged with an extension mechanism (13), an ultraviolet lamp (15) is arranged above the receiving tray (12), the irradiation intensity of the ultraviolet lamp (15) is greater than or equal to 100 mW / cm², and one end of the receiving tray (12) is connected with an inclined discharge chute (16).

4. The oil fume filtering device of claim 1, wherein: The accelerator adding mechanism (26) comprises an atomizing nozzle (261) and an accelerator storage container (262), the atomizing nozzle (261) is installed on the side wall of the accelerator spray pipe (21), the spraying direction of the atomizing nozzle (261) is towards the inside of the accelerator spray pipe (21), the atomizing nozzle (261) is connected with the accelerator storage container (262) through a delivery pump (263), and the accelerator storage container (262) stores the accelerator.

5. The oil fume filtering device according to claim 4, wherein: The accelerator is a hydrofluoroether compound with a boiling point of 40-80 ℃.

6. The oil smoke filtering device of claim 1, wherein: The nozzle (31) of the vortex tube is connected with an air compressor (32).

7. The oil smoke filtering device of claim 1, wherein: The first air inlet pipe (19), the second air inlet pipe (20) and the accelerator spray pipe (21) are all Venturi tubes.

8. The oil smoke filtering device of claim 1, wherein: The exhaust pipe (8) is connected with an air suction mechanism (33).

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