Oil mist wet dust collector

Abstract

The application relates to the technical field of dust collectors, and discloses an oil mist wet-type dust collector, which comprises a lower cylinder and a circulating water tank, the lower cylinder is used for placing a structure for cleaning oil mist, and the circulating water tank is used for storing washing liquid; supporting frames are fixedly connected to the two sides of the outer wall of the lower cylinder; a conical ash bucket is fixedly connected to the bottom of the lower cylinder; and an upper cylinder is fixedly connected to the top of the lower cylinder. The three-stage airflow organization structure makes the oil mist-containing waste gas uniformly distributed in the cylinder and produce cyclone movement, effectively avoids airflow deflection and short circuit, prolongs the gas-liquid contact time, and improves the capture probability of oil mist particles; three groups of independent spraying pipelines are arranged and are respectively provided with nozzles with different functions, independent control of three working conditions of normal washing, backwashing of the filler and washing of the demister is realized, the large-diameter anti-blocking nozzle fundamentally avoids oil dirt blockage, backwashing can effectively remove the oil dirt accumulated in the filler layer, and the problems of airflow short circuit and decreased purification efficiency caused by filler blockage are solved.

Description

Technical Field

[0001] This invention relates to the field of dust collector technology, specifically to an oil mist wet dust collector. Background Technology

[0002] Industrial oil mist, characterized by high temperatures and a tendency to undergo fission, poses a serious threat to personnel. During the processing of parts in production equipment, lubricating and cooling oil, when heated to a certain temperature, can fission into toxic and harmful substances such as acrolein, benzo[a]pyrene, and polycyclic aromatic hydrocarbons. These substances also have a strong odor and can directly cause mutagenic, teratogenic, and even carcinogenic effects on production workers. Furthermore, industrial oil mist is characterized by high concentrations, low moisture content, small particle size, and a strong tarry odor, making purification extremely difficult. Experts analyze that industrial oil mist has a very high concentration of oil fumes, with small oil mist particles (less than 0.1 μm in diameter) in an emulsified mist form, making it impossible for general purification devices to completely remove it.

[0003] In the machining industry, cutting fluids, quenching oils, and lubricating oils are used extensively in metal cutting, grinding, cold heading, and heat treatment processes. During processing, a large amount of oil mist is generated due to high-temperature evaporation and high-speed rotation splashing. The oil mist particles are mostly between 0.1 and 10 micrometers in size and contain mineral oil, additives, and metal dust. Long-term inhalation can damage the respiratory system of workers, and the diffuse oil mist affects visibility in the workshop and the cleanliness of equipment, posing a fire hazard.

[0004] High-boiling-point components of VOCs (such as o-xylene and decane) condense and adhere to the pores of the packing material at low temperatures. Viscous oil mist forms an oil film on the packing surface, and this oil clogging causes the pressure drop to increase by more than 35% within 72 hours. Oil accumulation in the packing material leads to uneven gas-liquid distribution, causing airflow short-circuiting and a significant decrease in fine particle capture efficiency. Backwashing can alleviate the problem but is difficult to completely remove the oil. Furthermore, after the baffles and wire mesh demister trap oil droplets, oil sludge deposits and agglomerates on the blades / wire mesh, resulting in increased demister pressure differential (>1500 Pa), a sharp increase in fan load, and even motor overload. After demister failure, the outlet gas carries a large amount of oil droplets, forming "white smoke," a secondary pollution that corrodes downstream pipelines and fans. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an oil mist wet dust collector, which solves the problems of oil clogging of the packing material and clogging and liquid carryover in the demister.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an oil mist wet dust collector, comprising: The lower cylinder and the circulating water tank are used to house the structure for cleaning oil mist, and the circulating water tank is used to store the washing liquid. Support frames are fixedly connected to both sides of the outer wall of the lower cylinder. A conical ash hopper is fixedly connected to the bottom of the lower cylinder. An upper cylinder is fixedly connected to the top of the lower cylinder. An oil mist concentration sensor is installed on the top of the inner wall of the upper cylinder. An air inlet pipe is fixedly connected to the rear end of the lower cylinder. A first guide vane is fixedly connected to one end of the air inlet pipe. A flow equalization plate is fixedly connected to the bottom of the inner wall of the lower cylinder. A fixing block is fixedly connected to the middle of the inner wall of the lower cylinder. A second guide vane is fixedly connected to the inner wall of the fixing block. Spraying components are provided at the rear end of the inner wall of the upper cylinder and the top of the rear end of the inner wall of the lower cylinder. A connecting block is provided at the bottom middle of the inner wall of the upper cylinder. A Pall ring is provided on the inner wall of the connecting block. A evenly distributed porous support plate is provided on the inner wall of the Pall ring. A baffle demister is provided at the top middle of the inner wall of the upper cylinder. Wire mesh demisters are provided at the top and bottom of the baffle demister.

[0007] Preferably, the spray assembly includes a spray pipe, a backwash pipe, and a flushing pipe. One end of the spray pipe is connected to the top rear end of the lower cylinder and the bottom rear end of the upper cylinder, respectively, and is fixedly connected. One end of the backwash pipe is connected to the rear end of the upper cylinder and is fixedly connected. One end of the flushing pipe is connected to the top rear end of the upper cylinder and is fixedly connected.

[0008] Preferably, the bottom of the spray pipe is threaded with evenly distributed nozzles, the bottom of the backwash pipe is threaded with evenly distributed nozzles, and the bottom of the flushing pipe is threaded with evenly distributed nozzles.

[0009] Preferably, the nozzles on the spray pipe are large-diameter anti-clogging atomizing nozzles, the nozzles on the backwash pipe are backwash nozzles, and the nozzles on the flushing pipe are flushing nozzles.

[0010] Preferably, a water distributor is provided at the rear end of the spray pipe, backwash pipe and flushing pipe, and a water distributor is provided at the front end of the water distributor.

[0011] Preferably, a fan is connected through and fixedly to the top of the upper cylinder, and an air outlet is provided on one side of the fan.

[0012] Preferably, a drain pipe is provided through the bottom of the conical ash hopper, a liquid level sensor is provided at the top of the inner wall of the conical ash hopper, a water supply pipe is provided through and fixedly connected to one side of the conical ash hopper, and a solenoid valve and a water quality sensor are provided at one end of the water supply pipe.

[0013] Preferably, a return pipe is connected through and fixedly connected to the other side of the conical ash hopper, a circulating water tank is connected through and fixedly connected to one end of the return pipe, a sensor is installed through and installed on the top of the circulating water tank, and a circulating pipe is connected through and fixedly connected to one end of the circulating water tank.

[0014] Working principle: Oil mist-containing exhaust gas is drawn into the lower cylinder through the inlet pipe by the fan; the airflow first passes through the first guide vane, changing from a horizontal direction to a vertical upward direction, and then passes through the flow equalization plate for uniform distribution, so that the airflow is evenly distributed on the cross section of the cylinder; the evenly distributed airflow continues to rise, and when it passes through the second guide vane, it generates a swirling motion, which prolongs the residence time of the airflow in the cylinder; Meanwhile, the circulating water pump pressurizes and delivers the washing liquid in the circulating water tank to the water distributor, which then distributes it evenly before it enters the spray pipe. The large-diameter anti-clogging atomizing nozzles on the spray pipe atomize the washing liquid into droplets of 50μm to 200μm, which spray downwards and come into contact with the rising oil mist airflow in the opposite direction. The oil mist particles collide with the droplets through inertial collision, interception and diffusion, and after being captured by the droplets, they fall with the droplets into the conical ash hopper. After initial washing, the airflow continues to rise and enters the packing layer inside the upper cylinder 4. The Pall ring packing provides a huge gas-liquid contact surface area. The spray liquid forms a uniform liquid film on the packing surface. When the airflow passes through the packing layer, it comes into full contact with the liquid film, and the residual oil mist particles are further captured. The packing layer has a capture efficiency of no less than 95% for oil mist particles with a particle size greater than 1μm. After being purified by the packing layer, the airflow carrying some fine droplets continues to rise, passing sequentially through the wire mesh demister (primary demister) at the bottom of the baffle demister, the baffle demister (inertial demister), and the wire mesh demister (fine demister) at the top of the baffle demister. This three-stage demister combination can control the liquid content of the outlet gas to below 50 mg / m³, effectively avoiding the "white smoke" phenomenon and downstream pipeline corrosion. The purified gas is then discharged from the outlet by the fan. The falling washing liquid, carrying the captured oil mist particles, collects in a conical ash hopper. The liquid level in the conical ash hopper is monitored in real time by a liquid level sensor. When the liquid level is lower than the set lower limit, the control system automatically opens the solenoid valve on the water supply pipe to replenish clean water. The degree of contamination of the washing liquid is monitored by a water quality sensor on the water supply pipe. When the conductivity exceeds the set threshold, the system automatically opens the electric drain valve on the drain pipe to discharge part of the waste liquid while replenishing clean water, thus realizing automatic renewal of the washing liquid. The liquid in the conical ash hopper flows into the sedimentation zone of the circulating water tank through the return pipe. After sedimentation and separation, it overflows into the clean water zone and is then transported to the spray system for recycling through the circulation pipe and circulating water pump. Backwashing function: After the equipment has been running continuously for a certain period of time (which can be set from 8 to 24 hours), the control system automatically starts the backwashing program. The backwashing program shuts off the water supply to the spray pipe and opens the water supply to the backwash pipe. The backwash nozzles spray water downwards at a pressure of 0.3MPa to 0.6MPa to backwash the Pall ring packing layer, flushing the oil accumulated in the packing pores into the conical ash hopper. The backwashing lasts for 3 to 10 minutes, and the spraying automatically resumes after the backwashing is completed. The backwashing function can effectively prevent the packing layer from being clogged by oil, and keep the pressure drop of the packing layer within 10% during 72 hours of continuous operation (far lower than the increase of more than 35% in traditional equipment). Demister flushing function: It can be started in conjunction with the backwashing program or independently at a timed interval. The flushing nozzles on the flushing pipe spray downwards at a pressure of 0.2MPa to 0.4MPa to flush the baffle demister and wire mesh demister, removing the oil sludge accumulated on the blades and wire mesh. The flushing time is 2 to 5 minutes, which can control the demister pressure difference below 500Pa (far lower than the pressure difference value of more than 1500Pa in traditional equipment), avoiding a sharp increase in fan load and motor overload.

[0015] This invention provides an oil mist wet dust collector. It has the following beneficial effects: 1. This invention utilizes a three-stage airflow organization structure to uniformly distribute oil-mist-containing exhaust gas within the cylinder and generate swirling motion, effectively preventing airflow deviation and short-circuiting, extending gas-liquid contact time, and increasing the capture probability of oil mist particles. By setting up three independent spray pipelines and configuring nozzles with different functions, independent control of three operating conditions—normal washing, packing backwashing, and demister flushing—is achieved. Large-diameter anti-clogging nozzles fundamentally prevent oil clogging, and backwashing effectively removes oil accumulated in the packing layer, solving the problems of airflow short-circuiting and reduced purification efficiency caused by packing blockage. The Pall ring packing provides a large gas-liquid contact surface area, significantly improving oil mist purification efficiency. The three-stage demister structure, combining a wire mesh demister and a baffle plate demister, thoroughly removes oil-containing droplets entrained in the airflow, eliminating secondary pollution from the outlet "white smoke" and preventing corrosion of downstream pipelines and fans. Online flushing of the demister prevents oil sludge deposition and agglomeration, which can lead to increased fan load and motor overload, extending equipment lifespan.

[0016] 2. This invention achieves fully automatic operation through a combination of multiple sensing elements and a controller. It can automatically adjust the fan speed according to the oil mist concentration at the outlet to achieve energy saving, and automatically complete water replenishment, water replacement, and timed flushing. The entire machine can operate continuously and stably without manual intervention, reducing operation and maintenance costs. The circulating water tank achieves closed-loop recycling of the washing liquid through partitioned sedimentation, reducing fresh water consumption and wastewater discharge. The water distributor ensures uniform flow and pressure at each nozzle, avoiding blind spots in local spraying. The main components are made of stainless steel with polished inner walls, which is resistant to oil corrosion and adhesion, and has a long service life. The pipeline insulation design can prevent freezing in winter. The whole adopts a flange segmented and modular structure, which is convenient for assembly and maintenance, and is suitable for oil mist exhaust gas purification treatment in various mechanical processing processes. Attached Figure Description

[0017] Figure 1 This is a front view of the present invention; Figure 2 This is a perspective view of the present invention; Figure 3 This is a cross-sectional view of the present invention; Figure 4 This is a cross-sectional perspective view of the present invention; Figure 5 This is a rear perspective view of the present invention.

[0018] The components are as follows: 1. Support frame; 2. Conical ash hopper; 3. Lower cylinder; 4. Upper cylinder; 5. Air outlet; 6. Fan; 7. Water supply pipe; 8. Sewage discharge pipe; 9. Return pipe; 10. Circulating water tank; 11. Circulating pipe; 12. Sensor; 13. Liquid level sensor; 14. First guide vane; 15. Flow equalization plate; 16. Fixing block; 17. Second guide vane; 18. Spray pipe; 19. Nozzle; 20. Connecting block; 21. Pall ring; 22. Water distributor; 23. Backwash pipe; 24. Baffle plate demister; 25. Wire mesh demister; 26. Flushing pipe; 27. Oil mist concentration sensor; 28. Porous support plate; 29. ​​Water distributor; 30. Air inlet pipe. Detailed Implementation

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Example: Please see the appendix Figure 1 - Appendix Figure 5 This invention provides an oil mist wet dust collector, including... The lower cylinder 3 and the circulating water tank 10 are used to house the structure for cleaning oil mist. The circulating water tank 10 is used to store the washing liquid. Support frames 1 are fixedly connected to both sides of the outer wall of the lower cylinder 3. A conical ash hopper 2 is fixedly connected to the bottom of the lower cylinder 3. An upper cylinder 4 is fixedly connected to the top of the lower cylinder 3. An oil mist concentration sensor 27 is installed on the top of the inner wall of the upper cylinder 4.

[0021] An oil mist concentration sensor 27 is installed on the top of the inner wall of the upper cylinder 4. The oil mist concentration sensor 27 is a light scattering type oil mist concentration detector, and the model can be SICK FWE200 or equivalent. The measurement range is 0 mg / m³ to 50 mg / m³, the resolution is 0.1 mg / m³, the response time is no more than 2 seconds, and the protection level is IP65. The oil mist concentration sensor 27 is fixed to the top of the inner wall of the upper cylinder 4 by a bracket, with the probe facing the airflow direction. The sensor cable is led out through a gland seal on the wall of the upper cylinder 4.

[0022] An air inlet pipe 30 is fixedly connected to the rear end of the lower cylinder 3. A first guide vane 14 is fixedly connected to one end of the air inlet pipe 30. A flow equalization plate 15 is fixedly connected to the bottom of the inner wall of the lower cylinder 3. A fixing block 16 is fixedly connected to the middle of the inner wall of the lower cylinder 3. A second guide vane 17 is fixedly connected to the inner wall of the fixing block 16. Spraying components are provided at the rear end of the inner wall of the upper cylinder 4 and the top of the rear end of the inner wall of the lower cylinder 3. A connecting block 20 is provided at the bottom middle of the inner wall of the upper cylinder 4. A Pall ring 21 is provided on the inner wall of the connecting block 20. A porous support plate 28 with uniform distribution is provided on the inner wall of the Pall ring 21. A baffle plate demister 24 is provided at the top middle of the inner wall of the upper cylinder 4. A wire mesh demister 25 is provided at the top and bottom of the baffle plate demister 24. A connecting block 20 is provided at the bottom center of the inner wall of the upper cylinder 4. The connecting block 20 is a ring-shaped support structure made of 304 stainless steel, with a ring width of 60mm to 100mm and a thickness of 10mm to 15mm, and is fixed to the inner wall of the upper cylinder 4 by welding. The upper surface of the connecting block 20 is provided with an annular groove for supporting the porous support plate 28.

[0023] The porous support plate 28 is a circular grid plate made of 304 stainless steel, with a thickness of 5mm to 8mm and a diameter the same as the inner diameter of the upper cylinder 4. The porous support plate 28 has evenly distributed strip-shaped grid holes, with a hole width of 8mm to 15mm, a grid hole spacing of 10mm to 20mm, and an opening rate of 60% to 75%. The outer edge of the porous support plate 28 overlaps within the annular groove of the connecting block 20 and is fixed by bolts or pressure blocks. The function of the porous support plate 28 is to support the Pall ring 21 packing above, while allowing airflow and liquid to pass freely.

[0024] The Pall rings 21 are filled above the porous support plate 28, with a filling height of 300mm to 600mm. The Pall rings 21 are made of polypropylene (PP) or 304 stainless steel, with a nominal diameter of 25mm to 50mm, a specific surface area of ​​100m² / m³ to 200m² / m³, a porosity of 85% to 95%, and a stack size of 5000 rings / m³ to 15000 rings / m³. The Pall rings 21 have a hollow cylindrical structure with two layers of staggered rectangular windows on their sidewalls. Each layer of windows has five blades, which curve inwards and extend to the center of the ring. The function of the Pall rings 21 is to provide a large gas-liquid contact surface area, allowing the spray liquid to form a uniform liquid film on the packing surface. When the oil mist gas flow passes through the packing layer, it comes into full contact with the liquid film, and the oil mist particles are captured by the liquid film, thereby achieving the washing and purification of the oil mist. The filtration accuracy of the packing layer can reach over 1μm, and the collection efficiency for oil mist particles with a diameter greater than 1μm is no less than 95%.

[0025] The first guide vane 14 is fixedly connected to one end of the air inlet pipe 30 that extends into the lower cylinder 3. The first guide vane 14 consists of 4 to 8 arc-shaped stainless steel blades, with a blade thickness of 2 mm to 3 mm and a blade curvature of 90° to 120°. The blades are evenly distributed radially along the air inlet pipe 30 and welded to the inner port of the air inlet pipe 30. The function of the first guide vane 14 is to guide the oil mist airflow entering from the air inlet pipe 30 from the horizontal direction to the vertical upward direction, and at the same time to initially distribute the airflow evenly, so as to avoid the airflow directly impacting the cylinder wall and forming a deflection.

[0026] A flow equalization plate 15 is fixedly connected to the bottom of the inner wall of the lower cylinder 3. The flow equalization plate 15 is a circular perforated plate made of 304 stainless steel, with a thickness of 3mm to 5mm and a diameter the same as the inner diameter of the lower cylinder 3. Ventilation holes with diameters of 8mm to 15mm are evenly distributed on the flow equalization plate 15, with an opening rate of 40% to 60% and a hole spacing of 15mm to 25mm, arranged in an equilateral triangle. The outer edge of the flow equalization plate 15 is fixed to the annular support ring on the inner wall of the lower cylinder 3 by welding or bolting, and the installation position is 100mm to 200mm above the outlet of the air inlet pipe 30. The function of the flow equalization plate 15 is to perform secondary distribution of the rising airflow, ensuring uniform distribution of the airflow across the cylinder cross-section and providing uniform airflow conditions for subsequent spray washing.

[0027] A fixing block 16 is fixedly connected to the inner wall of the lower cylinder 3. The fixing block 16 is an annular structure made of 304 stainless steel, with a ring width of 50mm to 80mm and a thickness of 8mm to 12mm, and is fixed to the inner wall of the lower cylinder 3 by welding. A second guide vane 17 is fixedly connected to the inner wall of the fixing block 16. The second guide vane 17 consists of 6 to 12 spiral stainless steel blades, with a blade thickness of 2mm to 3mm and a blade helix angle of 30° to 45°, and the blades are evenly distributed along the inner circumference of the fixing block 16. The function of the second guide vane 17 is to generate swirling motion in the rising airflow, prolong the residence time of the airflow in the cylinder, enhance the gas-liquid contact effect, and at the same time use centrifugal force to throw some large oil droplets toward the cylinder wall.

[0028] The spray assembly includes a spray pipe 18, a backwash pipe 23, and a flushing pipe 26. One end of the spray pipe 18 is connected to the top rear end of the lower cylinder 3 and the bottom rear end of the upper cylinder 4, respectively, and is fixedly connected. One end of the backwash pipe 23 is connected to the rear end of the upper cylinder 4, and one end of the flushing pipe 26 is connected to the top rear end of the upper cylinder 4, and a uniformly distributed nozzle 19 is threaded through and threaded onto the bottom of the spray pipe 18. A uniformly distributed nozzle 19 is threaded through and threaded onto the bottom of the backwash pipe 23. The bottom of the nozzle 19 and the flushing pipe 26 are both threaded with evenly distributed nozzles 19. The bottom of the spray pipe 18 is threaded with evenly distributed nozzles 19. The bottom of the backwash pipe 23 is threaded with evenly distributed nozzles 19. The bottom of the flushing pipe 26 is threaded with evenly distributed nozzles 19. The rear end of the spray pipe 18, the backwash pipe 23 and the flushing pipe 26 are all provided with a water distributor 29. The front end of the water distributor 29 is provided with a water distributor 22.

[0029] Spraying assemblies are provided at the rear end of the inner wall of the upper cylinder 4 and at the top of the rear end of the inner wall of the lower cylinder 3. The spraying assembly includes three independent pipelines: a spray pipe 18, a backwash pipe 23, and a flushing pipe 26. All three pipelines are made of 304 stainless steel seamless pipes with a diameter of DN25 to DN50 and a wall thickness of 2mm to 3mm.

[0030] Several spray pipes 18 are provided, one penetrating and fixedly connected to the top rear end of the lower cylinder 3, and another penetrating and fixedly connected to the bottom rear end of the upper cylinder 4. The portion of the spray pipe 18 inside the cylinder is arranged horizontally along the radial direction of the cylinder, with a pipe length slightly smaller than the inner diameter of the cylinder. Nozzles 19 are evenly threaded through and connected to the bottom of the spray pipe 18 along its length, with a nozzle spacing of 100mm to 150mm, and 6 to 12 nozzles 19 are provided on each spray pipe 18. The nozzles 19 on the spray pipe 18 are large-diameter anti-clogging atomizing nozzles, with a nozzle diameter of 4mm to 8mm, an atomization angle of 90° to 120°, a working pressure of 0.2MPa to 0.4MPa, and a single nozzle flow rate of 10L / min to 30L / min. The nozzle adopts a large flow channel design, which is not easily clogged by oil, and the atomized droplet particle size is 50μm to 200μm, which can fully contact the oil mist particles.

[0031] The backwash pipe 23 penetrates and is fixedly connected to the rear end of the upper cylinder 4, located above the packing layer (Pall ring 21). The backwash pipe 23 is arranged horizontally radially within the cylinder, with nozzles 19 evenly threaded at the bottom. The nozzle spacing is 80mm to 120mm, and a total of 6 to 10 nozzles 19 are provided. The nozzles 19 on the backwash pipe 23 are backwash nozzles with a nozzle diameter of 6mm to 10mm, a spray angle of 30° to 60° (downward direct spray type), a working pressure of 0.3MPa to 0.6MPa, and a single nozzle flow rate of 20L / min to 50L / min. The backwash nozzles adopt a direct spray design, providing a large water flow impact force, used for periodically backwashing the oil accumulated in the packing layer to prevent clogging.

[0032] The flushing pipe 26 penetrates and is fixedly connected to the top rear end of the upper cylinder 4, located above the demister assembly. The flushing pipe 26 is arranged horizontally radially within the cylinder, with nozzles 19 evenly threaded at its bottom. The nozzle spacing is 80mm to 120mm, and a total of 4 to 8 nozzles 19 are provided. The nozzles 19 on the flushing pipe 26 are flushing nozzles with a nozzle diameter of 5mm to 8mm, a spray angle of 60° to 90°, a working pressure of 0.2MPa to 0.4MPa, and a single nozzle flow rate of 15L / min to 25L / min. The flushing nozzles are used to periodically flush away the sludge accumulated on the baffle demister 24 and the wire mesh demister 25, maintaining the cleanliness and demisting efficiency of the demisters.

[0033] The rear ends (outer ends of the cylinder) of the spray pipe 18, backwash pipe 23, and flushing pipe 26 are all equipped with water distributors 29. The water distributor 29 is a cylindrical water distribution chamber made of 304 stainless steel, with a diameter of 80mm to 120mm and a length of 200mm to 400mm. The inlet end of the water distributor 29 has an internal thread interface (DN25 to DN50), and the outlet end has branch interfaces corresponding to each spray pipe. The front end (inlet side) of the water distributor 29 is equipped with a water distributor 22. The water distributor 22 is a multi-hole rectifier plate structure with a plate thickness of 3mm to 5mm. The plate has evenly distributed water distribution holes with a diameter of 3mm to 6mm, and an opening rate of 30% to 50%. The function of the water distributor 22 is to evenly distribute the water entering the water distributor 29 to each branch pipe, ensuring consistent flow rate and pressure at each nozzle. Both the outer walls of the water distributor 29 and the water distribution unit 22 are equipped with an insulation layer (rubber and plastic insulation cotton with a thickness of 10mm to 20mm) to prevent the pipes from freezing due to low winter temperatures.

[0034] The spray pipe 18, backwash pipe 23, and flushing pipe 26 are each equipped with an electric regulating valve (model Siemens VVF42 or equivalent) and a pressure gauge (range 0MPa to 1.0MPa, accuracy class 1.6) on the external pipes of the cylinder, for independently controlling the flow rate and pressure of each spray group. The water inlets of each group of pipes are combined and connected to the circulating water pump through the circulation pipe 11. A baffle demister 24 is installed at the top center of the inner wall of the upper cylinder 4. Located above the packing layer, the baffle demister 24 consists of multiple parallel baffles. The baffles are made of 304 stainless steel, with a thickness of 1mm to 2mm, a height of 150mm to 300mm, and a spacing of 20mm to 40mm. The cross-section of the baffles is sinusoidal or sawtooth (herringbone) with a bending angle of 90° to 120°, and each baffle has 2 to 3 bends. The baffle demister 24 is fixed to the inner wall of the upper cylinder 4 by a frame made of 304 stainless steel angle steel. The function of the baffle demister 24 is to use the principle of inertial collision to capture oil-containing droplets in the airflow on the surface of the baffles, achieving a demisting efficiency of no less than 99% for droplets with a diameter greater than 15μm.

[0035] Both the top and bottom of the baffle demister 24 are equipped with wire mesh demisters 25. The wire mesh demister 25 is a circular wire mesh pad woven from 304 stainless steel wire or polypropylene wire mesh, with a wire diameter of 0.1mm to 0.3mm, 8 to 15 mesh layers, a thickness of 100mm to 200mm, a specific surface area of ​​300m² / m³ to 500m² / m³, and a porosity of 96% to 99%. The outer edge of the wire mesh demister 25 is fixed to the inner wall of the upper cylinder 4 by a grid pressure ring. The function of the wire mesh demister 25 is to further capture fine droplets that the baffle demister 24 fails to remove, with a capture efficiency of no less than 98% for droplets with a diameter greater than 3μm. The wire mesh demister 25 at the bottom of the baffle demister 24 serves as primary demister, while the wire mesh demister 25 at the top of the baffle demister 24 serves as fine demister. The two-stage wire mesh demister, combined with the baffle, can control the liquid content of the outlet gas to below 50 mg / m³. A drain pipe 8 is installed through and connected to the bottom of the conical ash hopper 2. The drain pipe 8 is made of 304 stainless steel, with a diameter of DN50 to DN100 and a wall thickness of 3mm to 4mm. An electric drain valve (selectable as a DN50 to DN100 stainless steel electric ball valve with an IP65 protection rating) is installed on the drain pipe 8 for periodically discharging the oily sludge and waste liquid accumulated in the conical ash hopper 2. The outlet of the drain pipe 8 can be connected to an oil-water separator or a wastewater treatment system.

[0036] A liquid level sensor 13 is installed at the top of the inner wall of the conical ash hopper 2. The liquid level sensor 13 is an immersion-type hydrostatic level gauge, model E+H FMX21 or equivalent, with a measurement range of 0m to 2m, an accuracy of ±0.5%FS, an output signal of 4mA to 20mA, and an IP68 protection rating. The probe of the liquid level sensor 13 is fixed to the top of the inner wall of the conical ash hopper 2 by a bracket, and the probe extends downwards into the liquid inside the ash hopper for real-time monitoring of the liquid level.

[0037] A water supply pipe 7 is connected and fixedly connected to one side of the conical ash hopper 2. The water supply pipe 7 is made of 304 stainless steel, with a diameter of DN20 to DN40 and a wall thickness of 2mm to 3mm. An electromagnetic valve and a water quality sensor are installed at one end (the external end) of the water supply pipe 7. The electromagnetic valve is a normally closed stainless steel type, with a model selectable from DN20 to DN40, an operating voltage of AC220V, and a protection rating of IP65. The water quality sensor is a conductivity-type water quality sensor with a measurement range of 0μS / cm to 2000μS / cm and an accuracy of ±1%FS, used to monitor the contamination level of the circulating washing liquid. When the water quality sensor detects that the conductivity of the washing liquid exceeds a set threshold (e.g., 1500μS / cm), the control system automatically opens the electromagnetic valve to replenish clean water and simultaneously opens the drain valve to discharge some waste liquid, thus achieving automatic replacement of the washing liquid.

[0038] A return pipe 9 is connected and fixedly connected to the other side of the conical ash hopper 2. The return pipe 9 is made of 304 stainless steel, with a diameter of DN40 to DN80 and a wall thickness of 3mm to 4mm. One end of the return pipe 9 is connected and fixedly connected to a circulating water tank 10. The circulating water tank 10 is a cuboid or cylindrical water storage tank, welded from 304 stainless steel plate, with a wall thickness of 3mm to 5mm and an effective volume of 0.5m³ to 2m³. The top of the circulating water tank 10 is equipped with a maintenance manhole (diameter of 300mm to 500mm) and a chemical dosing port. The interior of the circulating water tank 10 is equipped with a partition, dividing the tank into a sedimentation zone and a clear water zone. The sedimentation zone is connected to the return pipe 9, and the clear water zone is connected to the circulating pipe 11. The height of the partition is 70% to 80% of the height of the tank, allowing the return liquid to overflow into the clear water zone after sedimentation.

[0039] A sensor 12 is installed through and installed on the top of the circulating water tank 10. The sensor 12 includes a liquid level sensor and a temperature sensor. The liquid level sensor is an immersion-type hydrostatic level gauge (same specifications as liquid level sensor 13), and the temperature sensor is a Pt100 platinum resistance thermometer with a measurement range of 0℃ to 100℃ and an accuracy of ±0.5℃. The sensor 12 is used to monitor the liquid level and water temperature in the circulating water tank 10 in real time. A circulation pipe 11 is installed and fixedly connected to one end of the circulating water tank 10 (the clear water zone side). The circulation pipe 11 is made of 304 stainless steel, with a diameter of DN40 to DN80 and a wall thickness of 3mm to 4mm. The other end of the circulation pipe 11 is connected to a circulating water pump, which is a stainless steel centrifugal pump with a flow rate of 10m³ / h to 30m³ / h, a head of 20m to 40m, and a motor power of 1.5kW to 5.5kW. The circulating water pump pressurizes the washing liquid in the circulating water tank 10 and delivers it to the water distributor 29, which then distributes it to each spray pipeline via the water distributor 22.

[0040] A water distributor 29 is installed at the rear end of the spray pipe 18, the backwash pipe 23 and the flushing pipe 26, and a water distributor 22 is installed at the front end of the water distributor 29.

[0041] A drain pipe 8 is installed through the bottom of the conical ash hopper 2. A liquid level sensor 13 is installed at the top of the inner wall of the conical ash hopper 2. A water supply pipe 7 is installed through and fixedly connected to one side of the conical ash hopper 2. A solenoid valve and a water quality sensor are installed at one end of the water supply pipe 7. A return pipe 9 is installed through and fixedly connected to the other side of the conical ash hopper 2. A circulating water tank 10 is installed through and fixedly connected to one end of the return pipe 9. A sensor 12 is installed through and fixedly connected to the top of the circulating water tank 10. A circulating pipe 11 is installed through and fixedly connected to one end of the circulating water tank 10.

[0042] A fan 6 is connected and fixedly connected to the top of the upper cylinder 4. The fan 6 is a centrifugal fan, model 4-72 or equivalent, with an air volume of 3000 m³ / h to 15000 m³ / h, a total pressure of 1500 Pa to 3000 Pa, a motor power of 3 kW to 15 kW, and a speed of 1450 r / min to 2900 r / min. The air inlet of the fan 6 is connected to the top of the upper cylinder 4 via a flange, with an oil-resistant rubber gasket at the connection. The volute and impeller of the fan 6 are made of 304 stainless steel or treated with an anti-corrosion coating to resist corrosion from oily gases. An air outlet 5 is provided on one side of the fan 6. The air outlet 5 is a circular flange interface with a pipe diameter of 200 mm to 400 mm, used to connect to an exhaust pipe. An activated carbon adsorption device (optional configuration) can be selectively installed at the air outlet 5 for further removal of odors and VOCs. The motor of fan 6 is equipped with a frequency converter (the model can be Siemens MM440 or equivalent), which can automatically adjust the fan speed according to the detection signal of oil mist concentration sensor 27 to achieve energy-saving operation.

[0043] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An oil mist wet dust collector, characterized in that, include: The lower cylinder (3) and the circulating water tank (10) are used to house the structure for cleaning oil mist. The circulating water tank (10) is used to store the washing liquid. The lower cylinder (3) is fixedly connected to both sides of the outer wall of the lower cylinder (3). The bottom of the lower cylinder (3) is fixedly connected to the conical ash hopper (2). The top of the lower cylinder (3) is fixedly connected to the upper cylinder (4). The top of the inner wall of the upper cylinder (4) is provided with an oil mist concentration sensor (27). An air inlet pipe (30) is fixedly connected to the rear end of the lower cylinder (3). A first guide vane (14) is fixedly connected to one end of the air inlet pipe (30). A flow equalization plate (15) is fixedly connected to the bottom of the inner wall of the lower cylinder (3). A fixing block (16) is fixedly connected to the middle of the inner wall of the lower cylinder (3). A second guide vane (17) is fixedly connected to the inner wall of the fixing block (16). The rear end of the inner wall of the upper cylinder (4) and the lower cylinder (3) are connected to the lower cylinder (3). Spraying components are provided at the top and rear ends of the inner wall of the upper cylinder (4). A connecting block (20) is provided at the bottom middle of the inner wall of the upper cylinder (4). A Pall ring (21) is provided on the inner wall of the connecting block (20). A porous support plate (28) with uniform distribution is provided on the inner wall of the Pall ring (21). A baffle plate demister (24) is provided at the top middle of the inner wall of the upper cylinder (4). A wire mesh demister (25) is provided at the top and bottom of the baffle plate demister (24).

2. The oil mist wet dust collector according to claim 1, characterized in that, The spray assembly includes a spray pipe (18), a backwash pipe (23), and a flushing pipe (26). One end of the spray pipe (18) is connected to the top of the rear end of the lower cylinder (3) and the bottom of the rear end of the upper cylinder (4) respectively. One end of the backwash pipe (23) is connected to the rear end of the upper cylinder (4) and the flushing pipe (26) is connected to the top of the rear end of the upper cylinder (4).

3. The oil mist wet dust collector according to claim 2, characterized in that, The bottom of the spray pipe (18) is threaded with evenly distributed nozzles (19), the bottom of the backwash pipe (23) is threaded with evenly distributed nozzles (19), and the bottom of the flushing pipe (26) is threaded with evenly distributed nozzles (19).

4. The oil mist wet dust collector according to claim 2, characterized in that, The nozzle (19) on the spray pipe (18) is a large-diameter anti-clogging atomizing nozzle, the nozzle (19) on the backwash pipe (23) is a backwash nozzle, and the nozzle (19) on the flushing pipe (26) is a flushing nozzle.

5. The oil mist wet dust collector according to claim 2, characterized in that, The spray pipe (18), backwash pipe (23) and flush pipe (26) are all equipped with water distributors (29) at their rear ends, and water distributors (22) are equipped at the front ends of the water distributors (29).

6. The oil mist wet dust collector according to claim 1, characterized in that, A fan (6) is connected through and fixed to the top of the upper cylinder (4), and an air outlet (5) is provided on one side of the fan (6).

7. The oil mist wet dust collector according to claim 1, characterized in that, The bottom of the conical ash hopper (2) is provided with a drain pipe (8), the top of the inner wall of the conical ash hopper (2) is provided with a liquid level sensor (13), one side of the conical ash hopper (2) is provided with a water supply pipe (7), and one end of the water supply pipe (7) is provided with a solenoid valve and a water quality sensor.

8. The oil mist wet dust collector according to claim 1, characterized in that, A return pipe (9) is connected through and fixedly connected to the other side of the conical ash hopper (2). A circulating water tank (10) is connected through and fixedly connected to one end of the return pipe (9). A sensor (12) is installed through and fixedly connected to the top of the circulating water tank (10). A circulating pipe (11) is connected through and fixedly connected to one end of the circulating water tank (10).

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