Oil-water supercavitation oil-water separation equipment and process

Abstract

The present application relates to the technical field of petroleum extraction wastewater treatment, and in particular to an oil-water separation device, which includes a sewage treatment tank; a dissolved air device is provided outside the sewage treatment tank; an aeration zone and a tailwater zone are formed in the sewage treatment tank; the sewage treatment tank is equipped with a mixing pipe for introducing oily sewage into the aeration zone; the mixing pipe is arranged in a plurality of continuous S-shaped structures, and a plurality of dosing pipes are installed in the length direction of the mixing pipe; a dissolved air releaser is provided in the aeration zone; the dissolved air device is connected to the dissolved air releaser through a connecting pipe; the present application also discloses an oil-water separation process; the present application has the effect of improving the uniformity of mixing sewage and reagents, thereby improving the oil-water separation efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of oil production wastewater treatment, and in particular to an oil-water supercavitation oil-water separation device and process. Background Art

[0002] The wastewater generated during the oil extraction process contains a large amount of crude oil and sludge. Its composition is very complex and difficult to treat. Common treatment methods include chemical methods and physical methods. The chemical method purifies the water quality by adding flocculants and coagulants to precipitate the oil and impurities in the wastewater; while the physical method uses oil-water separation equipment to share and remove insoluble suspended matter in oilfield wastewater through physical action. Among them, flotation deoiling is used for oily wastewater treatment to make the oil in the wastewater float.

[0003] The relevant oil-water separation equipment includes a sewage treatment tank, which is provided with a first sedimentation tank, a flotation tank, a second sedimentation tank and a filter tank in sequence along the water treatment direction. The first sedimentation tank is provided with a water inlet, and the filter tank is provided with a discharge port. The lower end of the flotation tank is provided with an aeration mechanism, and the top is provided with a scraper. The sewage first enters the first sedimentation tank from the water inlet and then overflows into the flotation tank. The tiny bubbles generated by the aeration mechanism in the flotation tank adhere to the dirt to separate the oil and water. The oil floating on the water surface is then scraped off by the scraper on the flotation tank. The water then flows into the second sedimentation tank and the filter tank and is discharged through the discharge port. The oil discharged from the discharge port contains less oil, thereby achieving the effect of oil-water separation.

[0004] However, in the above structure, the sewage entering the first sedimentation tank is mixed unevenly with the chemicals by the way in which the chemicals are added. Summary of the Invention

[0005] In order to improve the uniformity of mixing of sewage and chemicals, the present application provides an oil-water supercavitation oil-water separation device and process.

[0006] This application provides an oil-water supercavitation oil-water separation device, which adopts the following technical solutions:

[0007] An oil-water separation device comprises a sewage treatment tank; a dissolved air device is provided outside the sewage treatment tank; an aeration zone and a tailwater zone are formed in the sewage treatment tank; a mixing pipe is installed in the sewage treatment tank for introducing oily sewage into the aeration zone; the mixing pipe is arranged in a plurality of continuous S-shaped structures, and a plurality of dosing pipes are installed in the length direction of the mixing pipe; a dissolved air releaser is provided in the aeration zone; and the dissolved air device is connected to the dissolved air releaser via a connecting pipe.

[0008] By adopting the above technical solution, when in use, the mixing pipe connected to the sewage treatment tank transports oily sewage. In the process of the sewage moving along the mixing pipe, it is mixed with the medicine transported by the dosing pipe at different positions. Then, in the process of the sewage moving along the mixing pipe, the sewage can be mixed with the medicine. At the same time, arranging the dosing pipes at multiple positions can enable multiple positions to be added in batches. Moreover, the mixing pipe has a continuous S-shaped structure, so that the sewage in the mixing pipe can be better mixed, and the sewage entering the aeration zone is better mixed with the medicine before aeration. The dissolved air releaser is used to release the gas dissolved by the dissolved air device under pressure into the sewage to separate the oil. The tail water area is the water after the oil is separated.

[0009] Preferably, the air dissolving device includes an air dissolving tank, a return pipe and an air inlet pipe; the return pipe is connected to the air dissolving tank and the tail water area through a water pump; the air inlet pipe is connected to the air dissolving tank and is used to introduce nitrogen into the air dissolving tank, and a sealing protective cover for sealing the top of the sewage treatment tank is provided on the top of the sewage treatment tank; a nitrogen barrier is formed under the sealing protective cover on the top of the sewage treatment tank.

[0010] By adopting the above technical solution, the water pump flows the water in the tailwater area into the dissolved air tank again, and then the air inlet pipe introduces nitrogen into the dissolved air tank to dissolve the nitrogen in the water. The water dissolved with nitrogen is then input into the sewage treatment tank, so that the nitrogen is released and moves to the upper part of the sewage treatment tank. Under the action of the sealing protective cover, a nitrogen barrier is formed on the top of the sewage treatment tank, which isolates the sewage in the sewage treatment tank from the air and reduces the reaction between the oxygen in the air and the oil in the sewage.

[0011] Preferably, a rotating drum is provided in the air dissolving tank; an outer drum is sleeved on the outer side of the rotating drum; the lower opening of the outer drum exposes the rotating drum; the rotating drum is connected to a driving device for driving the rotating drum to rotate; a water holding chamber is provided in the rotating drum, and a plurality of water holding chambers are arranged around the circumference of the rotating drum; the inner side of the outer drum is sealed with the outer wall of the rotating drum to seal the water holding chamber; the interior of the outer drum is a hollow structure and is connected to the return water pipe; a water outlet hole for letting water into the water holding chamber is provided on the outer drum; the air inlet pipe is arranged at the center of the rotating drum and an air inlet valve for letting air into the water holding chamber is installed on the air inlet pipe.

[0012] By adopting the above technical solution, the rotating drum is rotated by the driving device, and a water holding chamber is provided in the rotating drum, so that the water holding chamber rotates around the axis of the rotating drum. When water flows into the water holding chamber through the water outlet hole provided on the outer cylinder, the water holding chamber continues to rotate and cooperates with the inner wall of the outer cylinder to seal the water holding chamber, so that the water in the water holding chamber shakes when it rotates, thereby improving the contact between the water in the water holding chamber and the air, and increasing the amount of dissolved air in the water.

[0013] Preferably, the water outlet hole on the outer cylinder is located at the position where the water chamber enters and is sealed with the outer cylinder, and the air inlet valves are distributed at intervals along the rotation axis of the rotating cylinder, and the multiple air inlet valves intermittently intake air into the water chamber.

[0014] By adopting the above technical solution, multiple air intake valves are distributed along the rotating axis of the drum, so that the water holding chamber can be intermittently connected to different air intake valves. When the water holding chamber is disconnected from the air intake valve, part of the gas and water enter the water holding chamber and mix, and the pressure in the water holding chamber drops. Then, when it is connected to the air intake valve again, the gas in the air intake pipe enters the water holding chamber again, thereby increasing the amount of dissolved air in the water in the water holding chamber.

[0015] Preferably, the driving device includes a groove wheel, a rotating wheel and a power motor; the groove wheel is coaxially fixed on the rotating drum, and the power motor is installed on the dissolved air tank; the rotating wheel is coaxially fixed to the output shaft of the power motor; the edge of the rotating wheel is provided with a plurality of nail rods that engage with the groove wheel; the center lines of the rotating wheel and the groove wheel do not coincide.

[0016] By adopting the above technical solution, when the power motor drives the wheel to rotate, the nail rod on the wheel can enter the groove wheel, and then when the nail rod drives the wheel to rotate, it can drive the wheel to rotate at an uneven speed, thereby making the water in the water chamber shake more and increasing the dissolved air content of the water.

[0017] Preferably, the outer cylinder is configured as an arc as a whole, and the position where the outer cylinder is connected to the return pipe and the position where the water outlet is located on the outer cylinder are located on both sides of the highest point in the middle of the outer cylinder.

[0018] By adopting the above technical solution, the outer cylinder is arc-shaped as a whole, so that the water entering the connection position between the outer cylinder and the return pipe reaches the highest point in the outer cylinder and then flows to the side of the outer cylinder close to the water outlet, thereby not affecting the continuous water inlet of the water pump during the intermittent water inlet of the water chamber.

[0019] Preferably, the plurality of air inlet valves are distributed in the area where the outer cylinder is arranged; when the rotating cylinder drives the water storing chamber to rotate, the water storing chamber is separated from the water outlet and then connected to the first air inlet valve, and before the water storing chamber enters the lower position of the outer cylinder, the water storing chamber is disconnected from the last air inlet valve.

[0020] By adopting the above technical solution, in the area where the outer tube of the air inlet valve is arranged, the water storing chamber is disconnected from the air inlet valve before the water storing chamber enters the lower position of the outer tube, and then the water in the water storing chamber flows downward, making it convenient for the water storing chamber to be connected to the water outlet hole for water intake next time. At the same time, the first air inlet valve is connected to the water storing chamber after the water storing chamber is separated from the water outlet hole, so that sufficient water can enter the water storing chamber and a part of the gas will be sealed.

[0021] Preferably, the lower portion of the air dissolving tank is concave downward to form a water outlet cavity; and the connecting pipe is connected to the water outlet cavity.

[0022] By adopting the above technical solution, the lower part of the dissolved air tank is concave to form a water outlet cavity. When the water storage cavity is downward, water enters the water outlet cavity for retention, reducing the amount of dissolved air water entering the water storage cavity again.

[0023] Preferably, a branch pipe is connected to the connecting pipe; a plurality of hoses are provided on the branch pipe; one end of the plurality of hoses is connected to the branch pipe, and the other end is connected to the mixing pipe, and the connection positions of the plurality of hoses and the mixing pipe are spaced apart along the length direction of the mixing pipe.

[0024] By adopting the above technical solution, the branch pipe is connected with the connecting pipe, so that the dissolved air water in the connecting pipe first enters the mixing pipe through the hose, and is mixed with the sewage in the mixing pipe at the same time, thereby diluting the sewage depth and making it easier for the oil in the sewage to float up under the action of excess gas.

[0025] The present application also provides an oil-water supercavitation oil-water separation process, which adopts the following technical solution:

[0026] An oil-water separation process includes adding chemicals into multiple dosing pipes on a mixing pipe, and mixing the chemicals with sewage in the mixing pipe as it flows along the mixing pipe.

[0027] By adopting the above technical solution, multiple dosing tubes on the mixing tube add chemicals, so that the chemicals can be mixed with the sewage in the mixing tube at multiple positions, so that the sewage can also be mixed with the chemicals when it flows, thereby improving the mixing uniformity of the chemicals and sewage.

[0028] In summary, this application includes at least one of the following beneficial technical effects:

[0029] 1. The sewage is mixed with the chemicals delivered by the dosing pipe at different positions. Then, when the sewage moves along the mixing pipe, the sewage can be mixed with the chemicals. Arranging the dosing pipes at multiple positions can enable multiple positions to be added in batches. The continuous S-shaped structure of the mixing pipe can better mix the sewage in the mixing pipe, so that the sewage entering the aeration zone is mixed with the chemicals evenly before aeration.

[0030] 2. By dissolving nitrogen in water and inputting it into the sewage treatment pool, the nitrogen is released and moves to the upper part of the sewage treatment pool. Under the action of the sealing protective cover, a nitrogen barrier is formed on the top of the sewage treatment pool, isolating the sewage in the sewage treatment pool from the air and reducing the reaction between oxygen in the air and the oil in the sewage;

[0031] 3. When the water chamber is disconnected from the air inlet valve, part of the gas and water enter the water chamber and mix, and the pressure in the water chamber drops. Then when it is connected to the air inlet valve again, the gas in the air inlet pipe enters the water chamber again, thereby increasing the amount of dissolved gas in the water in the water chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0033] Figure 2 This is a schematic diagram of the internal structure of a sewage treatment tank according to an embodiment of the present application;

[0034] Figure 3 This is a schematic diagram of the installation structure of the scraping device according to the embodiment of the present application;

[0035] Figure 4 This is a schematic diagram of the internal structure of the gas dissolving tank in the embodiment of the present application;

[0036] Figure 5 This is a schematic diagram of the position structure of the rotating drum and the outer drum in an embodiment of the present application;

[0037] Figure 6 It is a schematic diagram of the connection structure of the driving device of an embodiment of the present application.

[0038] Explanation of reference numerals: 1. sewage treatment tank; 11. aeration zone; 12. flotation zone; 13. balance zone; 14. tailwater zone; 15. regulating gate; 151. screw; 152. hand wheel; 16. connecting pipe; 17. sludge collection box; 18. inclined plate; 19. collection cone box; 191. sludge discharge pipe; 2. dissolved air releaser; 21. connecting pipe; 22. branch pipe; 23. hose; 3. dissolved air device; 31. dissolved air tank; 311. water outlet chamber; 32. return pipe ;321, water pump; 33, air inlet pipe; 34, rotating drum; 341, water chamber; 35, outer cylinder; 351, water inlet hole; 352, water outlet hole; 4, sealing protective cover; 41, exhaust pipe; 5, mixing pipe; 51, dosing pipe; 6, scraping device; 61, driving shaft; 62, gear; 63, chain; 64, scraping plate; 65, driving motor; 7, air inlet valve; 8, driving device; 81, groove wheel; 82, rotating wheel; 83, power motor; 84, nail rod. DETAILED DESCRIPTION

[0039] The following is combined with Figure 1-6 This application is described in further detail.

[0040] The present application discloses an oil-water supercavitation oil-water separation device, referring to Figure 1 and Figure 2, including a sewage treatment tank 1, in which an aeration zone 11, a flotation zone 12, a balancing zone 13, and a tailwater zone 14 are sequentially arranged along the direction of water treatment. A regulating gate 15 is provided between the balancing zones 13. The regulating gate 15 is used to adjust the water level in the balancing zone 13. A connecting pipe 16 is provided at the bottom of the flotation zone 12. One end of the connecting pipe 16 is located in the flotation zone 12, and the other end is fixed to the side wall of the balancing zone 13 near the flotation zone 12 and connected to the balancing zone 13, so that water in the flotation zone 12 can enter the balancing zone 13 through the connecting pipe 16. When the liquid level in the balancing zone 13 exceeds the regulating gate 15, the water overflows into the tailwater zone 14. The tailwater zone 14 is connected to a drain pipe and is discharged from the sewage treatment tank 1 through the drain pipe. A dissolved air releaser 2 is provided in the aeration zone 11, and a dissolved air device 3 is fixedly provided outside the sewage treatment tank 1. The dissolved air device 3 is used to dissolve gas into water under pressure. A connecting pipe 21 is provided between the dissolved air releaser 3 and the dissolved air releaser 2, so that the connecting pipe 21 can transport the water containing dissolved gas to the position of the dissolved air releaser 2. When the pressurized water is sent into the aeration zone 11 through the dissolved air releaser 2, the pressure is released, so that the gas in the water is released, thereby forming supercavitation bubbles that combine with the oil in the water, and float upward with the oil, and then flow into the flotation zone 12.

[0041] refer to Figure 1 and Figure 2 The gas introduced into the dissolved gas device 3 is nitrogen, and the tiny bubbles obtained by the dissolved gas releaser 2 are nitrogen. A sealing protective cover 4 is provided on the top of the sewage treatment tank 1. The sealing protective cover 4 covers the top of the sewage treatment tank 1 to seal the sewage treatment tank 1. An exhaust pipe 41 is provided on the sealing cover. The exhaust pipe 41 is used to discharge the gas in the sewage treatment tank 1 and protect the sewage treatment tank from being under normal atmospheric pressure. When the sealing protective cover 4 is used to seal the top of the sewage treatment tank 1, the sewage in the sewage treatment tank 1 is isolated from the air, and the gas introduced into the sewage treatment tank 1 is nitrogen, thereby forming a nitrogen barrier at the top of the sewage treatment tank 1, reducing the oxidation reaction between the oxygen in the air and the oil in the sewage, making it difficult to separate the oil and water.

[0042] refer to Figure 1A mixing tube 5 is provided on the outside of the sewage treatment tank 1. One end of the mixing tube 5 is connected to the aeration zone 11 and is located at the bottom of the aeration zone 11. The mixing tube 5 is coiled into a continuous S-shape on the outer wall of the sewage treatment tank 1, and a plurality of dosing tubes 51 are provided on the outer wall of the mixing tube 5. The plurality of dosing tubes 51 are spaced apart along the length of the mixing tube 5 so that when sewage is introduced into the mixing tube 5 away from the end connected to the aeration zone 11, the sewage can flow along the mixing tube 5. At the same time, chemicals are added to the sewage at different positions in the mixing tube 5 through the dosing tube 51. When the chemicals are added to the sewage and flow along the mixing tube 5, they can be fully mixed in the mixing tube 5. Then, different proportions of chemicals are added to each dosing tube 51 according to the mixed sewage, so that the oil in the sewage can achieve a greater coagulation effect.

[0043] refer to Figure 1 A branch pipe 22 is connected to the connecting pipe 21, and the branch pipe 22 extends to the position of the mixing pipe 5, and a plurality of hoses 23 are provided between the branch pipe 22 and the mixing pipe 5, one end of the hose 23 is connected to the branch pipe 22, and the other end is connected to the mixing pipe 5, and the positions where the plurality of hoses 23 are connected to the mixing pipe 5 are spaced apart along the length direction of the mixing pipe 5, so that the sewage can be mixed with the dissolved air water first, and then the dissolved air water and sewage are simultaneously introduced into the aeration zone 11 to dilute the sewage concentration, so that the bubbles released by the dissolved air releaser 2 in the aeration zone 11 can be sufficient for the oil pollution in the sewage, thereby achieving the effect of more fully separating the oil pollution.

[0044] refer to Figure 2 and Figure 3 A scraper 6 is installed at the top of the flotation zone 12. The scraper 6 is located inside the sealed protective cover 4, and a sludge collection box 17 is installed at one end of the scraper 6. A plurality of inclined plates 18 are installed in the center of the flotation zone 12. A connecting pipe 16 is located below the inclined plates 18. Below this connecting pipe 16 is a collection cone 19, with its smaller end facing downward to allow heavier sludge in the sewage to enter the collection cone 19. A sludge discharge pipe 191 is connected to the bottom of the collection cone 19 and is used to discharge the sludge from the collection cone 19. The inclined plates 18 are arranged parallel and tilted, with adjacent inclined plates 18 spaced apart. This allows water above the inclined plates 18 to flow below them and into the balancing zone 13 through the connecting pipe 16, reducing the flow energy of the sewage below the inclined plates 18 and thus achieving smooth sedimentation of heavier sludge.

[0045] refer to Figure 3The scraping device 6 includes a driving shaft 61, a gear 62, a chain 63 and a scraping plate 64. The driving shaft 61 is provided with two and is horizontally arranged on the sewage treatment tank 1. The driving shaft 61 is rotatably installed on the sewage treatment tank 1. A driving motor 65 is fixedly provided on the side wall of the sewage treatment tank 1. The output shaft of the driving motor 65 is coaxially fixedly connected to the driving shaft 61, and the gear 62 is coaxially fixed on the driving shaft 61. A gear 62 is provided at both ends of the driving shaft 61. The chain 63 is transmission-connected to the gears 62 on the two driving shafts 61, so that when the driving motor 65 drives one driving shaft 61 to rotate, the chain 63 rotates under the action of the gear 62, and the scraping plate 64 is fixed on the chain 63 and transmits along the chain 63. When the scraping plate 64 is located at the lower part of the chain 63, the scraping plate 64 approaches the position of the sludge collection box 17 along the chain 63, so that the scraping plate 64 can drive the oil to approach the sludge collection box 17. When the liquid level in the balancing zone 13 is adjusted by regulating the gate 15, the liquid level in the flotation tank is also adjusted simultaneously, so that the oil in the flotation tank can contact the scraper 64, allowing the scraper 64 to move the sludge into the sludge collection box 17. A vertical screw 151 is fixedly provided on the regulating gate 15, and a handwheel 152 is threadedly connected to the screw 151. A notch is formed in the side wall between the balancing zone 13 and the tailwater zone 14. The regulating gate 15 is slidably connected to the side wall and seals with the notch at the bottom of the notch; the handwheel 152 abuts the upper side of the sewage treatment tank 1. When the handwheel 152 is rotated, the handwheel 152 can drive the screw 151 to move vertically, thereby adjusting the height of the regulating gate 15.

[0046] refer to Figure 2 and Figure 4 The air dissolving device 3 includes an air dissolving tank 31, a return water pipe 32 and an air inlet pipe 33. The bottom of the air dissolving tank 31 is concave to form a water outlet chamber 311. The water outlet chamber 311 is connected to the end of the connecting pipe 21 away from the air dissolving releaser 2. The air dissolving tank 31 is configured to be cylindrical and placed horizontally, so that the return water pipe 32 is connected to one end of the air dissolving tank 31 and the air inlet pipe 33 is connected to the other end of the air dissolving tank 31. The air inlet pipe 33 adds nitrogen to the air dissolving tank 31 through a pressure device. A water pump 321 is connected to the return water pipe 32. The water inlet end of the water pump 321 is connected to the tail water area 14, and the water outlet end of the water pump 321 is connected to the air dissolving tank 31. When the water pump 321 is working, it can return the water in the tail water area 14 to the air dissolving tank 31. On the one hand, it is used to replenish the water in the flotation tank, and on the other hand, it is used to dissolve air through the return water.

[0047] refer to Figure 4 and Figure 5A rotating drum 34 is disposed within the gas dissolving tank 31. An outer drum 35 is sleeved around the outer surface of the rotating drum 34. The rotating drum 34 is rotatably connected within the outer drum 35, and the outer wall of the rotating drum 34 is in sealed engagement with the inner wall of the rotating drum 34. The outer drum 35 is configured as an arc-shaped hollow structure, with the rotating drum 34 exposed directly below the outer drum 35. An air inlet pipe 33 is passed through the center of the rotating drum 34, and the outer wall of the air inlet pipe 33 is in sealed engagement with the inner wall of the center of the rotating drum 34. Multiple water chambers 341 are disposed within the rotating drum 34. The multiple water chambers 341 are evenly distributed around the centerline of the rotating drum 34 and spaced apart along the axis of the rotating drum 34. The water holding chamber 341 is used to hold water, and as the rotating drum 34 rotates, the water in the water holding chamber 341 sways in the water holding chamber 341 . Then, when the water holding chamber 341 rotates to a position directly below the downward outer cylinder 35 , the water in the water holding chamber 341 can flow downward out of the water holding chamber 341 and into the water outlet chamber 311 , and then flow out of the dissolved air tank 31 through the connecting pipe 21 .

[0048] refer to Figure 4The outer cylinder 35 is provided with a water inlet hole 351, and the outer cylinder 35 is connected to the return pipe 32 through the water inlet hole 351, and the position of the water inlet hole 351 is located at one end of the arc of the outer cylinder 35, and the outer cylinder 35 is provided with a water outlet hole 352 on the inner wall of the outer cylinder 35 close to the rotating cylinder 34, and the water outlet hole 352 is located at the other end of the arc of the outer cylinder 35; the rotation direction of the rotating cylinder 34 is from the water outlet hole 352 to the water inlet hole 351, and the water outlet hole 352 is along the Multiple water holding chambers 341 are spaced apart along the axis of the rotating drum 34 and correspond to the multiple water holding chambers 341 distributed along the axis of the rotating drum 34. When the rotating drum 34 rotates, the water holding chambers 341 circumferentially around the axis of the rotating drum 34 correspond to the water outlet holes 352, allowing water in the water outlet holes 352 to enter the water holding chambers 341. After the water holding chambers 341 rotate past the corresponding positions of the water outlet holes 352, the water in the water holding chambers 341 is sealed within the water holding chambers 341. Multiple air intake valves 7 are provided on the sidewalls of the air intake pipe 33. The air intake valves 7 are one-way valves and are distributed around the circumference of the rotating drum 34 at angles within the arc formed by the outer cylinder 35. The water holding chambers 341 are separated from the water outlet holes 352 and communicate with the location of the first air intake valve 7. Multiple air intake valves 7 are spaced apart to allow the water holding chambers 341 to intermittently communicate with the air intake pipe 33 during rotation. Before the water chamber 341 enters the lower opening of the outer cylinder 35, the water chamber 341 is disconnected from the last air inlet valve 7, allowing the water in the water chamber 341 to flow out freely and reducing the pressure in the water chamber 341 to facilitate the re-entry of water into the water chamber 341. When the multiple air inlet valves 7 are intermittently connected to the water chamber 341, the water in the water chamber 341 is filled with water, which sways as the rotating drum 34 rotates, and can then mix with the nitrogen in the water chamber 341 and dissolve the nitrogen. After a portion of the nitrogen is dissolved, the pressure in the water chamber 341 will drop. Then, when the water chamber 341 is connected to the air inlet valve 7 again, some nitrogen can enter the water chamber 341 again, maintaining the pressure in the water chamber 341, and then dissolving the nitrogen again. Repeating this process multiple times can increase the amount of dissolved air in the water. The water inlet hole 351 and the water outlet hole 352 are located at the two ends of the arc of the outer tube 35, and the highest point of the middle part of the arc of the outer tube 35 is located on both sides of the water inlet hole 351 and the water outlet hole 352. The side of the inner part of the outer tube 35 close to the water outlet hole 352 can intermittently intake water into different water holding chambers 341 without affecting the continuous water inflow from the water inlet hole 351.

[0049] refer to Figure 6A driving device 8 is provided at one end of the rotating drum 34. The driving device 8 includes a groove wheel 81, a rotating wheel 82 and a power motor 83. The groove wheel 81 is coaxially fixed to the end of the rotating drum 34. A plurality of grooves are formed on the circumference of the groove wheel 81. The power motor 83 is fixed on the dissolved gas tank 31. The output shaft of the power motor 83 is coaxially fixed to the rotating wheel 82. The rotating wheel 82 is provided with a plurality of nail rods 84 that match the grooves on the groove wheel 81. The plurality of nail rods 84 are circumferentially arranged on the edge of the rotating wheel 82. At the same time, the center line of the rotating wheel 82 is aligned with the grooves. The center lines of the wheels 81 do not overlap, so that when the nail rod 84 rotates with the rotating wheel 82, part of the nail rod 84 engages with the groove wheel 81, causing the nail rod 84 to slide in the groove of the groove wheel 81. When the rotating wheel 82 drives the groove wheel 81 to rotate through the nail rod 84, the rotation speed of the groove wheel 81 driven by the nail rod 84 fluctuates, causing the speed at which the groove wheel 81 drives the rotating drum 34 to rotate to present a process from fast to slow and then to fast, thereby enabling the water in the water chamber 341 to shake, thereby increasing the contact between water and nitrogen, and thereby increasing the amount of dissolved gas.

[0050] This embodiment also discloses an oil-water supercavitation oil-water separation process, which uses the above-mentioned oil-water supercavitation oil-water separation equipment, and adds a reagent into the mixing tube 5 through multiple dosing tubes 51 distributed along the length direction of the mixing tube 5, so that the reagent and sewage can be mixed with the sewage multiple times before entering the sewage treatment tank 1, thereby improving the mixing uniformity of the sewage and the reagent.

[0051] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. An oil-water separation device, comprising a sewage treatment tank (1); characterized in that: A dissolved air device (3) is provided outside the sewage treatment tank (1); an aeration zone (11) and a tailwater zone (14) are formed inside the sewage treatment tank (1); a mixing pipe (5) is installed in the sewage treatment tank (1) for introducing oily sewage into the aeration zone (11); the mixing pipe (5) is provided in a plurality of continuous S-shaped structures, and a plurality of dosing pipes (51) are installed in the longitudinal direction of the mixing pipe (5); a dissolved air releaser (2) is provided in the aeration zone (11); the dissolved air device (3) is connected to the dissolved air releaser (2) via a connecting pipe (21); The air dissolving device (3) comprises an air dissolving tank (31), a return water pipe (32) and an air inlet pipe (33); the return water pipe (32) is connected to the air dissolving tank (31) and the tail water area (14) via a water pump (321); the air inlet pipe (33) is in communication with the air dissolving tank (31) and is used to introduce nitrogen into the air dissolving tank (31); a sealing protective cover (4) for sealing the top of the sewage treatment tank (1) is provided on the top of the sewage treatment tank (1); a nitrogen barrier is formed on the top of the sewage treatment tank (1) under the sealing protective cover (4); A rotating drum (34) is provided in the gas dissolving tank (31); an outer drum (35) is sleeved on the outer side of the rotating drum (34); a lower opening of the outer drum (35) exposes the rotating drum (34); the rotating drum (34) is connected to a driving device (8) for driving the rotating drum (34) to rotate; a water chamber (341) is provided in the rotating drum (34), and a plurality of water chambers (341) are arranged around the circumference of the rotating drum (34); the outer drum ( The inner side of the outer cylinder (35) is sealed with the outer wall of the rotating drum (34) to block the water holding chamber (341); the inner side of the outer cylinder (35) is a hollow structure and is connected to the return pipe (32); the outer cylinder (35) is provided with a water outlet (352) for feeding water into the water holding chamber (341); the air inlet pipe (33) is arranged at the center of the rotating drum (34) and an air inlet valve (7) is installed on the air inlet pipe (33) for feeding air into the water holding chamber (341); The driving device (8) comprises a groove wheel (81), a rotating wheel (82) and a power motor (83); the groove wheel (81) is coaxially fixed to the rotating drum (34), and the power motor (83) is installed on the dissolved gas tank (31); the rotating wheel (82) is coaxially fixed to the output shaft of the power motor (83); the edge of the rotating wheel (82) is provided with a plurality of nail rods (84) that engage with the groove wheel (81); the center lines of the rotating wheel (82) and the groove wheel (81) do not overlap.

2. The oil-water separation device according to claim 1, characterized in that: The water outlet hole (352) on the outer cylinder (35) is located at a position where the water chamber (341) enters and is sealed with the outer cylinder (35), and a plurality of the air inlet valves (7) are distributed at intervals along the rotation axis of the rotating cylinder (34), and the plurality of air inlet valves (7) intermittently intake air into the water chamber (341).

3. The oil-water separation device according to claim 1 or 2, characterized in that: The outer cylinder (35) is configured as an arc as a whole, and the position where the outer cylinder (35) is connected to the return pipe (32) and the position where the water outlet hole (352) is located on the outer cylinder (35) are located on both sides of the highest point in the middle of the outer cylinder (35).

4. The oil-water separation device according to claim 3, characterized in that: The plurality of air inlet valves (7) are distributed in the area where the outer cylinder (35) is arranged; when the rotating cylinder (34) drives the water holding chamber (341) to rotate, the water holding chamber (341) is separated from the water outlet hole (352) and then communicates with the first air inlet valve (7); before the water holding chamber (341) enters the lower position of the outer cylinder (35), the water holding chamber (341) is disconnected from the last air inlet valve (7).

5. The oil-water separation device according to claim 1, characterized in that: The lower portion of the gas dissolving tank (31) is concave downward to form a water outlet cavity (311); the connecting pipe (21) is in communication with the water outlet cavity (311).

6. The oil-water separation device according to claim 1, characterized in that: The connecting pipe (21) is connected to a branch pipe (22); a plurality of hoses (23) are provided on the branch pipe (22); one end of the plurality of hoses (23) is connected to the branch pipe (22), and the other end is connected to the mixing pipe (5); and the connection positions of the plurality of hoses (23) and the mixing pipe (5) are spaced apart along the length direction of the mixing pipe (5).

7. An oil-water separation process, using the oil-water separation equipment according to claim 1 to treat oily wastewater, characterized in that: The method includes adding a medicine into a plurality of medicine adding pipes (51) on a mixing pipe (5), and mixing the medicine as the sewage in the mixing pipe (5) flows along the mixing pipe (5).

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