An oil mist recovery system for an air mist oiler used in strip steel production

Abstract

The utility model provides a kind of oil mist recovery system of air mist oiling machine for strip steel production, including upper injection oil tank and lower injection oil tank, and the inside of upper injection oil tank and lower injection oil tank is provided with spray gun, and the system further includes upper injection oil tank, lower injection oil tank, oil mist separator, recovery oil tank, oil purifier and purification oil tank, oil mist in the upper injection oil tank and lower injection oil tank is adsorbed and separated by oil mist separator, and the oil droplet obtained by oil mist separator separation is absorbed and flows back into recovery oil tank, the lower portion of upper injection oil tank and lower injection oil tank is fixedly connected with oil return pipe, and the other end of oil return pipe is fixedly connected with recovery oil tank;The lower portion of the inner wall of upper injection oil tank is provided with oil collection groove, and the oil in oil collection groove flows into oil return pipe, and the lower portion of lower injection oil tank is obliquely arranged, and the oil obtained by recovery is filtered and dehydrated to reach reuse index, to realize the recycling of oil product.

Description

Technical Field

[0001] This utility model relates to the field of oil mist recovery technology, and in particular to an oil mist recovery system for an aerosol oiling machine used in strip steel production. Background Technology

[0002] To prevent rust from forming on cold-rolled pickled steel sheets and continuously annealed steel sheets during storage and transportation, a layer of anti-rust oil is usually applied to the surface of the steel sheet before it leaves the production line. The thickness of the anti-rust oil varies depending on the requirements of different products; for example, continuously annealed paper sheets require a coating of 10–30 mg / m². 2 Pickled plates, on the other hand, require a coating of 500–2000 mg / m². 2 Currently, most oiling equipment used in steel mills adopts electrostatic oiling. Electrostatic oiling requires specific conductivity of the oil and is not suitable for oils with poor polarization. In addition, since flammable and explosive oils are placed in high-voltage electrostatic generators, there are certain safety risks.

[0003] Aerosol spraying is another oiling method. It uses air pressure to atomize oil in an atomizing nozzle. The atomized oil mist is then sprayed onto the surface of the strip along with the air. After colliding with the high-speed moving strip, the oil mist is deposited on the surface, achieving uniform oiling of the plate. This oiling method is simple to operate, highly safe, and adaptable, making it a good supplementary oiling method to electrostatic oiling.

[0004] Aerosol coating uses gas pressure to spray atomized oil mist onto the surface of the steel strip. High-pressure gas diffuses easily, and less than half of the total sprayed oil mist actually reaches the steel strip surface. The rest of the oil mist is easily dispersed in the air. This part of the oil mist cannot diffuse into the environment and needs to be collected. However, the collected oil mist is polluted by the air environment, and the solid impurities and water content in the oil increase (usually greater than 0.05%), making it unusable. Utility Model Content

[0005] To address the aforementioned problems, this utility model discloses an oil mist recovery system for an aerosol oiling machine used in strip steel production. The system includes an upper spray oil tank and a lower spray oil tank, both of which are equipped with spray guns. The system also includes an oil mist separator, a recovery oil tank, an oil purifier, and a purified oil tank. The oil mist from the upper and lower spray oil tanks is absorbed by the oil mist separator and sent to the recovery oil tank. A return oil pipe is fixedly connected to the lower part of both the upper and lower spray oil tanks, with the other end of the return oil pipe fixedly connected to the recovery oil tank. This system is used for the recovery and treatment of oil in both aerosol and liquid states.

[0006] The lower inner wall of the upper injection tank is equipped with an oil collection trough, and the oil in the oil collection trough flows into the return oil pipe. The lower part of the lower injection tank is inclined. This arrangement is for collecting liquid oil.

[0007] The upper part of the upper injection tank is configured with an upper conical top, and an upper suction pipe is connected to the upper part of the upper injection tank. An inlet suction main pipe and an outlet suction pipe are respectively installed on the upper part of the inner wall of the lower injection tank. A first wool felt and a second wool felt are respectively installed on both sides of the inlet suction main pipe, and a third wool felt and a fourth wool felt are respectively installed on both sides of the outlet suction pipe. A lower suction pipe is fixedly connected to the side wall of the lower injection tank, and the lower suction pipe is connected to the inlet suction main pipe and the outlet suction pipe. Both the upper and lower suction pipes are connected to the input end of the oil mist separator. The placement of the first, second, third, and fourth wool felts aims to seal the gap between the steel belt and the lower injection tank as much as possible, reducing the escape of oil mist.

[0008] Preferably, the oil purifier is installed in both the recovery tank and the purification tank. That is, the oil is temporarily stored in the recovery tank, then processed by the oil purifier, and finally temporarily stored again in the purification tank.

[0009] Preferably, the oil purifier includes a solid filter and a water separator arranged in series to separate water and solid particles.

[0010] Preferably, a dehydration filter element is provided on one side of the interior of the dehydrator, and a separation filter element is provided on the other side. The upper part of the separation filter element is configured as a filtered oil outlet, and the lower part of the separation filter element is configured as a water storage tank. An oil drain valve is provided at the lower end of the water storage tank. The separated water enters the water storage tank, while the oil is discharged from the filtered oil outlet.

[0011] The beneficial effects of this invention are as follows: With this invention, when the strip steel running speed is between 30 and 800 m / min, the oil mist leakage is not visible to the naked eye outside the oiling machine, significantly improving the operating environment. The water content in the purified oil is less than 50 ppm, meeting the requirements for rust-preventive oil reuse. The utilization of the recycled oil can achieve a rust-preventive oil utilization rate of over 90%, resulting in significant economic and environmental benefits. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the oil mist recycling system of this utility model;

[0013] Figure 2 This is a side view of the housing of this utility model;

[0014] Figure 3 This is a front view of the housing of this utility model;

[0015] Figure 4 This is a side view of the lower housing of this utility model;

[0016] Figure 5 This is a diagram showing the composition of the oil purifier of this utility model.

[0017] List of reference numerals in the attached diagram:

[0018] 1. Oil reservoir; 2. Injection controller; 3. Upper injection oil tank; 4. Lower injection oil tank; 5. Spray gun; 6. Steel strip; 7. Air pressure regulating valve; 8. Oil mist separator; 9. Return oil pipe; 10. Recovery oil tank; 11. Oil purifier; 12. Purified oil tank; 13. Upper conical top; 14. Gas main pipe; 15. Liquid main pipe; 16. Oil collection tank; 17. Movable cover plate; 18. Upper chamber suction pipe; 19. Lower chamber suction pipe; 20. Second felt; 21. Inlet suction main pipe; 22. Third felt; 23. Fourth felt; 24. Outlet suction pipe; 25. Lower chamber bottom plate; 26. Oil drain port; 27. Solid filter; 28. Water separator; 29. ​​Dehydration filter element; 30. Filter oil outlet; 31. Separation filter element; 32. Water reservoir; 33. Drain valve; 34. First felt. Detailed Implementation

[0019] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to the directions in the accompanying drawings, and the terms "inner" and "outer" refer to the directions toward or away from the geometric center of a specific component, respectively.

[0020] like Figures 1 to 5 As shown, an oil mist recovery system for an aerosol oiling machine used in strip steel production is disclosed. This oil mist recovery system is applied to a spraying equipment, which includes an oil storage tank 1 and a spray controller 2. The oil mist recovery system includes an upper spray oil tank 3 and a lower spray oil tank 4. A steel strip 6 passes between the upper spray oil tank 3 and the lower spray oil tank 4. The side walls of the upper spray oil tank 3 and the lower spray oil tank 4 are provided with cover plates 17, which only retain front and rear entry openings. Spray guns 5 are installed inside both the upper spray oil tank 3 and the lower spray oil tank 4. When the steel strip 6 passes through the upper spray oil tank 3 and the lower spray oil tank 4, the air pressure regulating valve 7 is opened, and external air is sent out from the end of the spray gun 5 through the gas main pipe 14. At the same time, the tooling of the spray controller 2 supplies rust-preventive oil to the spray gun 5 through the liquid main pipe 15, and the rust-preventive oil is sent out from the end of the spray gun 5.

[0021] The upper injection tank 3 and the lower injection tank 4 have the same length and width. The length L of the tank is related to the strip width D of the unit, L = (1.2-1.5)D, and the width D = (300~500)mm. The height of the lower tank is related to the distance h1 between the nozzle and the strip, and the height H1 of the lower tank is related to the distance h1 between the spray gun and the strip, H1 = h1 + (100~250)mm. The air intake of the lower tank is installed at the bottom of the tank, and the center line of the air intake pipe is located 50mm below the center line of the spray gun.

[0022] The system also includes an oil mist separator 8, a recovery oil tank 10, an oil purifier 11, and a purification oil tank 12. The oil mist in the upper injection oil tank 3 and the lower injection oil tank 4 is absorbed by the oil mist separator 8 and sent to the recovery oil tank 10. The lower part of the upper injection oil tank 3 and the lower injection oil tank 4 are both fixedly connected to the return oil pipe 9, and the other end of the return oil pipe 9 is fixedly connected to the recovery oil tank 10.

[0023] An oil collection trough 16 is provided on the lower part of the inner wall of the upper injection oil tank 3. The oil mist impacts the inner wall and flows down into the oil collection trough 16. The oil in the oil collection trough 16 flows into the return oil pipe 9. The lower part of the lower injection oil tank 4 is inclined, and an oil drain port 26 is provided at the lower part of the lower injection oil tank 4. The oil drain port 26 is connected to the return oil pipe 9.

[0024] The upper end of the upper spray oil tank 3 is set as the upper box body conical top 13. The top of the upper spray oil tank 3 forms a certain cone angle A2. The angle of the cone angle is related to the viscosity of the rust-preventive oil. According to different oil properties, A2 = 90~120°. The height of the upper spray oil tank 3 is H1 = H2 + (50~100) mm. There are two air intakes in total, and the upper part of the upper spray oil tank 3 is connected to the upper box body air intake pipe 18, that is, the upper box body air intake pipe 18 and the air intake are connected.

[0025] The upper part of the inner wall of the lower injection tank 4 is provided with an inlet suction pipe 21 and an outlet suction pipe 24. The inlet suction pipe 21 is a 40×40mm square pipe with several suction ports on the upper surface of the pipe. The suction ports are 10×20mm elliptical holes. The first suction port is 25mm away from the fixed end of the suction pipe. The distance between the second suction port and the second suction port is 60mm. The subsequent suction ports are evenly distributed at a distance of 90mm. The number of suction ports is determined by the length of the inlet suction pipe 21. The length of the inlet suction pipe 21 is 0.8 times the length of the injection tank.

[0026] The inlet suction pipe 21 is provided with a first wool felt 34 and a second wool felt 20 on both sides, and the outlet suction pipe 24 is provided with a third wool felt 22 and a fourth wool felt 23 on both sides. The distance between the first wool felt 34 and the strip steel 6 is T1, T1 = (2~4) mm; the distance between the second wool felt 20 and the strip steel 6 is T2, T2 = (4~10) mm; and the distance between the third wool felt 22 and the fourth wool felt 23 and the strip steel 6 is T1, T1 = (2~4) mm.

[0027] The lower injection tank 4 has a lower suction pipe 19 fixedly connected to its side wall, and the lower suction pipe 19 is connected to the inlet suction main pipe 21 and the outlet suction pipe 24. Both the upper suction pipe 18 and the lower suction pipe 19 are connected to the input end of the oil mist separator 8. That is, the oil mist separator 8 generates suction to absorb the oil mist inside the upper injection tank 3 and the lower injection tank 4. The oil mist separator 8 can be shared with the upper injection tank 3 and the lower injection tank 4, or the upper injection tank 3 and the lower injection tank 4 can be configured independently. The suction volume of the oil mist separator 8 is determined according to the wind speed at the suction port, and the wind speed at each suction port is not less than 10 m / s. The oil mist separator 8 is equipped with a filter screen, and the filter screen has an oil filtration efficiency of not less than 95%. The filtered oil flows into the recovery tank 10.

[0028] An oil purifier 11 is installed between the recovery oil tank 10 and the purification oil tank 12. The oil purifier 11 includes a solid filter 27 and a water separator 28 arranged in series. A dehydration filter element 29 is installed on one side of the interior of the water separator 28, and a separation filter element 31 is installed on the other side of the water separator 28. The upper part of the separation filter element 31 is configured as a filtered oil outlet 30, and the lower part of the separation filter element 31 is configured as a water storage tank 32. An oil drain valve 33 is installed at the lower end of the water storage tank 32.

[0029] The rust-preventive oil collected in the recovery tank 10 will contain more solid impurities and moisture, making it unusable directly. The solids and moisture need to be removed. The rust-preventive oil collected in the recovery tank 10 is purified by the oil purifier 11 to remove solid impurities and moisture. The solid filter 27 can be a ceramic tube filter or a stainless steel sintered filter element filter, with a filtration accuracy of not less than 10μm. The dehydrator 28 has a double-layer structure: one layer is a dehydration filter element 29, composed of coalescing filter elements made of polar molecular materials; the other layer is a separation filter element 31, made of hydrophobic materials. When oil passes through the filter element, water droplets are blocked on the outer surface of the filter element, forming large water droplets. The coalesced water droplets settle to the bottom water reservoir 32 by gravity. The water in the water reservoir 32 is periodically drained through the drain valve 33. After being filtered and purified, the oil flows out from the filter oil outlet 30 and is stored in the purified oil tank 12. After the oil passes the manual test, it is discharged into the oil storage tank 1 for recycling. If the moisture content still does not meet the standard, it can be purified again by the oil purifier 11 until the moisture content meets the standard.

[0030] In actual operation tests, this oil mist recovery system is suitable for aerosol oiling machines. With this system, oil mist leakage is not visible to the naked eye when the strip steel runs at speeds of 30–800 m / min, significantly improving the operating environment. The water content in the purified oil is less than 50 ppm, meeting the requirements for rust-preventive oil reuse. The utilization of the recovered oil can achieve a rust-preventive oil utilization rate of over 90%, demonstrating significant economic and environmental benefits.

[0031] The technical means disclosed in this utility model are not limited to the technical means disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features.

Claims

1. An oil mist recovery system for an aerosol oiling machine used in strip steel production, comprising an upper spray oil tank (3) and a lower spray oil tank (4), wherein both the upper spray oil tank (3) and the lower spray oil tank (4) are equipped with spray guns (5), characterized in that: The system also includes an oil mist separator (8), a recovery oil tank (10), an oil purifier (11), and a purification oil tank (12). The oil mist in the upper injection oil tank (3) and the lower injection oil tank (4) is absorbed by the oil mist separator (8) and sent to the recovery oil tank (10). The lower part of the upper injection oil tank (3) and the lower injection oil tank (4) are both fixedly connected to a return oil pipe (9), and the other end of the return oil pipe (9) is fixedly connected to the recovery oil tank (10). The lower part of the inner wall of the upper injection tank (3) is provided with an oil collection groove (16), and the oil in the oil collection groove (16) flows into the return oil pipe (9). The lower part of the lower injection tank (4) is inclined. The upper end of the upper injection tank (3) is configured as an upper box cone top (13), and the upper part of the upper injection tank (3) is connected to the upper box suction pipe (18). The upper part of the inner wall of the lower injection tank (4) is respectively provided with an inlet suction main pipe (21) and an outlet suction pipe (24). The first wool felt (34) and the second wool felt (20) are respectively provided on both sides of the inlet suction main pipe (21). The third wool felt (22) and the fourth wool felt (23) are respectively provided on both sides of the outlet suction pipe (24). The side wall of the lower injection tank (4) is fixedly connected to the lower box suction pipe (19), and the lower box suction pipe (19) is connected to the inlet suction main pipe (21) and the outlet suction pipe (24). The upper box suction pipe (18) and the lower box suction pipe (19) are both connected to the input end of the oil mist separator (8).

2. The oil mist recovery system for an aerosol coating machine used in strip steel production according to claim 1, characterized in that: The oil purifier (11) is installed in the recovery oil tank (10) and the purification oil tank (12).

3. The oil mist recovery system for an aerosol coating machine used in strip steel production according to claim 1, characterized in that: The oil purifier (11) includes a solid filter (27) and a water separator (28) arranged in series.

4. The oil mist recovery system for an aerosol coating machine used in strip steel production according to claim 3, characterized in that: The dewatering device (28) has a dewatering filter element (29) on one side and a separation filter element (31) on the other side. The upper part of the separation filter element (31) is configured as a filter oil outlet (30), and the lower part of the separation filter element (31) is configured as a water storage device (32). The lower end of the water storage device (32) is configured with an oil drain valve (33).

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