Axial antigravity three-phase pre-separation device

Abstract

An axial anti-gravity three-phase pre-separation device relates to the technical field of oil field oily sewage treatment and comprises a water purification area barrel, a filler area barrel, a separation area barrel and a contact area barrel, the contact area barrel is positioned in the separation area barrel, and a cavity A is arranged between the contact area barrel and the separation area barrel; the separation area cylinder is located in the filler area cylinder, a cavity B is formed between the separation area cylinder and the filler area cylinder, the cavity B is filled with filler, the filler area cylinder is sleeved with the water purification area cylinder, a cavity C is formed between the water purification area cylinder and the filler area cylinder, a water outlet is connected to the bottom of the cavity C, and an oil collecting cylinder is arranged on the upper portion of the cavity B; the lower end of the oil collecting barrel is in sealed connection with the separation area barrel, an oil collecting cavity is formed between the oil collecting barrel and the separation area barrel, the oil collecting cavity is connected with an oil discharging pipe, the contact area barrel comprises a cylinder section located on the upper portion and a conical barrel section located on the lower portion, one side of the conical barrel section is tangentially connected with a nanometer gas-dissolved water inlet pipe, and the opposite side of the conical barrel section is tangentially connected with a water inlet pipe. According to the invention, three-phase pre-separation is realized.

Description

Technical Field

[0001] This utility model belongs to the field of oilfield oily wastewater treatment technology, and in particular relates to an axial anti-gravity three-phase pre-separation device. Background Technology

[0002] Settling tanks are core equipment in oilfield wastewater treatment, achieving stratified separation of oil, water, and suspended solids through gravity. Common processes include a "natural oil removal - coagulation and sedimentation - pressure filtration" flow. In Daqing Oilfield, both dehydration stations and wastewater treatment plants widely employ wastewater oil removal processes primarily based on settling tanks, utilizing the density difference between oil and water to achieve oil-water separation.

[0003] Currently, settling tanks suffer from problems such as low oil removal efficiency, poor adaptability to polymer-containing wastewater, and untimely oil layer aging and recovery during actual operation. Upgrading existing settling tanks poses risks such as explosions from residual oil and gas inside the tank, confined space work risks, and environmental and occupational health risks. Therefore, it is necessary to design a pre-separation device. Utility Model Content

[0004] In view of the technical bottlenecks and modification risks of existing settling tanks, the main purpose of this invention is to provide a three-phase pre-separation system for oil, water and mud as a pretreatment unit before the settling tank.

[0005] The technical solution provided by this utility model is: an axial anti-gravity three-phase pre-separation device, including a water purification zone cylinder, a packing zone cylinder, a separation zone cylinder, and a contact zone cylinder. The contact zone cylinder is located inside the separation zone cylinder and has a cavity A between them. The separation zone cylinder is located inside the packing zone cylinder and has a cavity B between them. The water purification zone cylinder is fitted outside the packing zone cylinder and has a cavity C between them. A drain outlet is connected to the bottom of cavity C. An oil collection cylinder is provided on the upper part of cavity B. The lower end of the oil collection cylinder is sealed to the separation zone cylinder and has an oil collection chamber between it and the separation zone cylinder. An oil discharge pipe is connected to the oil collection chamber. The contact zone cylinder includes a cylindrical section at the top and a conical section at the bottom. A nano dissolved air water inlet pipe is tangentially connected to one side of the conical section, and an inlet pipe is tangentially connected to the opposite side. Cavity B is filled with packing material.

[0006] A further technical solution is: the packing material is inclined plate packing material, the inclination angle between the inclined plate packing material and the horizontal plane is 70 degrees, and the spacing between the inclined plates is 50mm.

[0007] A further technical solution is: after the water inlet pipe and the nano dissolved air water inlet pipe are connected to the cone section at the bottom of the contact area cylinder, an extension pipe extends spirally upward along the inner wall of the cone section by 1 / 4 turn, and the extension pipe is at an angle of 15-25 degrees to the horizontal plane.

[0008] A further technical solution is: the lower part of the filling area cylinder is a conical cylinder, the lower end of the conical cylinder is sealed, a mud collecting funnel is provided on the inner side of the lower part of the conical cylinder, the mud collecting funnel faces downward after opening, and a mud discharge port is connected to the upper part of the mud collecting funnel.

[0009] A further technical solution is to provide a vent at the bottom of the conical cylinder at the bottom of the packing zone cylinder.

[0010] A further technical solution is: the upper end of the oil collection cylinder is equipped with an upper cover plate, and the upper cover plate is equipped with a handle.

[0011] A further technical solution is that the cone angle of the conical cylinder at the bottom of the contact area is 25-30 degrees.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] 1. In this utility model, after the water inlet pipe and the nano dissolved air water inlet pipe are connected to the lower conical section of the contact zone, the two water streams generate an upward hydraulic vortex in the conical section of the contact zone. The large suspended particles (sludge) in the oily wastewater have a density greater than that of oil and water. Under the action of centrifugal force, they are thrown onto the inner wall of the contact zone cylinder. The water flow is in a laminar state on the cylinder wall. Under the action of gravity, the suspended particles settle vertically along the inner surface of the inclined cone and are discharged from the lower port of the contact zone cylinder to the lower part of the packing zone cylinder. Finally, they are sucked out by the sludge collection funnel, thus realizing solid-phase separation.

[0014] 2. In this invention, oily wastewater and nano-dissolved water are fully mixed in the contact zone cylinder under the action of rotational force. The nano-bubbles in the nano-dissolved water capture oil droplets. Because the density of oil droplets is less than that of water, they are also adhered and captured by the nano-bubbles. Under the action of centrifugal force, the bubbles and oil droplets gather towards the center of the cylinder. When the oil and water reach their highest point in the contact zone cylinder, they enter cavity A together. In cavity A, the oil floats on top and moves upwards at the center of rotation under the action of the nano-bubbles, while the water moves downwards along the inner wall of the separation zone cylinder. After the oil droplets rise to the upper end of the separation zone cylinder, they are thrown into the oil collection chamber under the action of centrifugal force and discharged through the oil drain pipe at the bottom of the oil collection chamber. The water in the separation zone cylinder is filtered by the packing material and then flows from the upper end of the packing area into cavity C, finally being discharged through the drain outlet, thus achieving the separation of the oil and water phases.

[0015] 3. This application has a reasonable structure, quick separation, and high application reliability, making it suitable for widespread use. Attached Figure Description

[0016] Figure 1 This is a simplified diagram of the internal structure of the axial anti-gravity pre-separation device proposed according to the present invention.

[0017] Figure 2This is a simplified diagram of the external structure of the axial anti-gravity pre-separation device proposed according to the present invention.

[0018] In the diagram: 1. Separation zone cylinder; 2. Contact zone cylinder; 3. Oil collection cylinder; 4. Clean water zone cylinder; 5. Oil discharge pipe; 6. Packing zone cylinder; 7. Packing material; 8. Nano dissolved air water inlet pipe; 9. Extension pipe; 10. Sludge discharge port; 11. Sludge collection funnel mouth; 12. Vent port; 13. Water inlet pipe; 14. Drain port; 15. Cavity C; 16. Cavity A; 17. Cavity B; 18. Oil collection chamber; 19. Top cover plate; 20. Handle. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. 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 should fall within the protection scope of the present invention.

[0020] refer to Figure 1 , Figure 2This utility model discloses an axial anti-gravity three-phase pre-separation device, which structurally includes a water purification zone cylinder 4, a packing zone cylinder 6, a separation zone cylinder 1, and a contact zone cylinder 2. The contact zone cylinder 2 is located inside the separation zone cylinder 1 and has a cavity A16 between it and the separation zone cylinder 1. The separation zone cylinder 1 is located inside the packing zone cylinder 6 and has a cavity B17 between it and the packing zone cylinder 6. The cavity B17 is filled with packing 7. The water purification zone cylinder 4 is fitted outside the packing zone cylinder 6 and has a cavity C15 between it and the packing zone cylinder 6. The bottom of the cavity C15 is connected to a drain outlet 14, and an oil collection cylinder is provided on the upper part of the cavity B17. The lower end of the oil collecting cylinder 3 is sealed to the separation zone cylinder 1 and has an oil collecting chamber 18 between it and the separation zone cylinder 1. The oil collecting chamber 18 is connected to the oil drain pipe 5. The contact zone cylinder 2 includes a cylindrical section at the top and a conical section at the bottom. The cone angle of the conical section is 25-30 degrees. A nano dissolved air water inlet pipe 8 is tangentially connected to one side of the conical section, and an inlet pipe 13 is tangentially connected to the opposite side. After the inlet pipe 13 and the nano dissolved air water inlet pipe 8 are connected to the conical section at the bottom of the contact zone cylinder 2, an extension pipe 9 extends spirally upward along the inner wall of the conical section for 1 / 4 turn. The extension pipe 9 is at an angle of 15-25 degrees to the horizontal plane. After the inlet pipe 13 and the nano-dissolved air water inlet pipe 8 are connected to the lower conical section of the contact zone, the two water streams generate an upward hydraulic vortex within the conical section of the contact zone. Large suspended particles (sludge) in the oily wastewater have a density greater than oil and water, and are thrown against the inner wall of the contact zone cylinder 2 under centrifugal force. The water flow is laminar on the cylinder wall, and the suspended particles settle vertically along the inclined inner surface of the cone under gravity, discharging from the lower port of the contact zone cylinder 2 to the lower part of the packing zone cylinder 6. The lower part of the packing zone cylinder 6 is a conical cylinder with a sealed lower end. A sludge collection funnel 11 is provided on the inner side of the lower part of the conical cylinder, with the opening of the funnel 11 facing downwards. A sludge discharge port 10 is connected to the upper part of the funnel 11. The accumulated sludge is sucked out by the sludge collection funnel 11, achieving solid-phase separation.

[0021] In the contact zone cylinder 2, oily wastewater and nano-dissolved water are fully mixed under the action of rotational force. The nano-bubbles in the nano-dissolved water capture oil droplets. Since the density of oil droplets is less than that of water, they are also adhered and captured by the nano-bubbles. Under the action of rotational centrifugal force, the bubbles and oil droplets gather towards the center of the cylinder. When the oil and water reach their highest point in the contact zone cylinder 2, they overflow into cavity A16. In cavity A16, the oil floats on top. Under the action of the nano-bubbles, the center of rotation moves upward, while the water rotates downward along the inner wall of the separation zone cylinder 1. After the oil droplets rise to the upper end of the separation zone cylinder 1, they are thrown into the oil collection chamber 18 under the action of centrifugal force and discharged through the oil drain pipe 5 at the lower part of the oil collection chamber 18. The water in the separation zone cylinder 1 is filtered by the packing 7 and then enters the cavity C15 from the upper end of the packing area. Finally, it is discharged through the drain outlet 14, thus realizing the separation of oil and water phases.

[0022] The inclined plate packing is tilted at an angle of 70° to the horizontal plane, and the spacing between the inclined plates is 50 mm. When sewage flows vertically through the packing 7, due to the principles of gravity and hydrodynamics, the inclined plate surface guides the flow direction, forming a continuous and stable laminar flow. Fine suspended particles settle vertically along the inclined plate surface under the action of gravity, achieving secondary solid-liquid separation.

[0023] A vent 12 is provided at the bottom of the conical cylinder at the bottom of the packing zone cylinder 6.

[0024] The upper end of the oil receiving cylinder 3 is equipped with an upper cover plate 19, and the upper cover plate 19 is equipped with a handle 20. The lower part of the filling area cylinder 6 is provided with support legs.

Claims

1. An axial anti-gravity three-phase pre-separation device, characterized in that: It includes a water purification zone cylinder (4), a packing zone cylinder (6), a separation zone cylinder (1), and a contact zone cylinder (2). The contact zone cylinder (2) is located inside the separation zone cylinder (1) and has a cavity A (16) between it and the separation zone cylinder (1). The separation zone cylinder (1) is located inside the packing zone cylinder (6) and has a cavity B (17) between it and the packing zone cylinder (6). The water purification zone cylinder (4) is fitted outside the packing zone cylinder (6) and has a cavity C (15) between it and the packing zone cylinder (6). The bottom of the cavity C (15) is connected to... The cavity B (17) is equipped with a drain outlet (14), and an oil collection cylinder (3) is provided on the upper part of the cavity B (17). The lower end of the oil collection cylinder (3) is sealed to the separation zone cylinder (1) and there is an oil collection chamber (18) between the oil collection cylinder (3) and the separation zone cylinder (1). The oil collection chamber (18) is connected to an oil drain pipe (5). The contact zone cylinder (2) includes a cylindrical section at the top and a conical section at the bottom. A nano dissolved air water inlet pipe (8) is tangentially connected to one side of the conical section, and an inlet pipe (13) is tangentially connected to the other side. The cavity B (17) is filled with packing material (7).

2. The axial anti-gravity three-phase pre-separation device according to claim 1, characterized in that: The packing material (7) is an inclined plate packing material with an inclination angle of 70 degrees to the horizontal plane and a spacing of 50 mm between the inclined plates.

3. The axial anti-gravity three-phase pre-separation device according to claim 1, characterized in that: After the water inlet pipe (13) and the nano dissolved air water inlet pipe (8) are connected to the cone section at the bottom of the contact area cylinder (2), an extension pipe (9) extends spirally upward along the inner wall of the cone section for 1 / 4 turn. The extension pipe (9) is at an angle of 15-25 degrees to the horizontal plane.

4. The axial anti-gravity three-phase pre-separation device according to claim 1, characterized in that: The lower part of the filling area cylinder (6) is a conical cylinder with the lower end of the conical cylinder sealed. A mud collecting funnel (11) is provided on the inner side of the lower part of the conical cylinder. The mud collecting funnel (11) is open and facing downwards. A mud discharge port (10) is connected to the upper part of the mud collecting funnel (11).

5. The axial anti-gravity three-phase pre-separation device according to claim 4, characterized in that: The bottom of the cone-shaped cylinder at the bottom of the filling zone cylinder (6) is provided with a vent (12).

6. The axial anti-gravity three-phase pre-separation device according to claim 1, characterized in that: The upper end of the oil collection cylinder (3) is equipped with an upper cover plate (19), and the upper cover plate (19) is equipped with a handle (20).

7. The axial anti-gravity three-phase pre-separation device according to claim 1, characterized in that: The cone angle of the cone-shaped body at the bottom of the contact area cylinder (2) is 25-30 degrees.

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