spiral oil separation separator

Abstract

This utility model belongs to the field of petroleum extraction technology and discloses a cyclone separator for oil removal, including an inner cylinder, an outer cylinder, a sediment discharge pipe, a floating oil discharge pipe, a sludge discharge pipe, and a flotation coil. The inner cylinder is fixed inside the outer cylinder. A pipe mixer is installed at the lower end of the outer cylinder. The wastewater inlet of the pipe mixer is connected to the crude oil pipeline. A baffle is fixedly connected to the lower end of the inner cylinder. A conveying pipe is installed at the upper end of the inner cylinder. The lower end of the conveying pipe is fixedly inserted through the baffle and extends into the lower end of the inner cylinder, connecting to the outlet of the pipe mixer. The outlet of the conveying pipe is inclined towards the upper inner wall of the inner cylinder. A discharge port is opened on the inner cylinder to discharge the separated wastewater into the outer cylinder. This utility model utilizes the centrifugal force of the cyclone in the inner cylinder, gravity sedimentation, and the flotation effect of the flotation coil in the outer cylinder to simultaneously achieve four-phase separation of oil, suspended solids, sludge, and water. Compared with traditional gravity separation technology, the separation purity is significantly improved.

Description

Technical Field

[0001] This utility model relates to the field of petroleum extraction technology, and in particular to a cyclone separator for oil removal. Background Technology

[0002] Most of my country's oilfields have entered the middle and late stages of oil extraction, with the water content of the extracted crude oil reaching 70% to 80%, and even as high as 90% in some oilfields. This results in a large amount of oily wastewater after oil-water separation. Direct discharge of this oily wastewater without treatment not only pollutes the soil and water sources but can also cause oil spills, threatening public safety, causing economic losses to the country, and harming the interests of the oilfields themselves. Therefore, developing efficient and economical oily wastewater treatment and reuse technologies suitable for the actual conditions of my country's oilfields, achieving energy conservation, reduced consumption, environmental protection, and water resource reuse, has become a crucial issue in the renovation and establishment of oilfield water treatment plants.

[0003] Therefore, a cyclone oil separator is proposed. Utility Model Content

[0004] The purpose of this invention is to provide a cyclone separator for oil removal, thereby solving or at least alleviating one or more of the aforementioned problems and other issues existing in the prior art.

[0005] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0006] A cyclone separator for oil removal includes:

[0007] The system comprises an inner cylinder and an outer cylinder. The inner cylinder is fixed inside the outer cylinder. A pipe mixer is installed at the lower end of the outer cylinder. The sewage inlet of the pipe mixer is connected to the crude oil pipeline. A baffle is fixedly connected to the lower end of the inner cylinder. A conveying pipe is provided at the upper end of the inner cylinder. The lower end of the conveying pipe is fixedly inserted through the baffle and extends into the lower end of the inner cylinder, connecting with the outlet of the pipe mixer. The outlet of the conveying pipe is inclined towards the upper inner wall of the inner cylinder. The lower end of the inner cylinder is inverted conical.

[0008] A sediment discharge pipe, one end of which extends into the outer cylinder and is connected to the lower end of the inner cylinder;

[0009] An oil spill discharge pipe, one end of which extends into the outer cylinder and then passes through the upper end of the inner cylinder;

[0010] A sludge discharge pipe, one end of which extends into the interior of the outer cylinder, and a sludge collection cylinder is installed at the upper end of the sludge discharge pipe at an adjustable height.

[0011] The inner cylinder has a discharge port for discharging the internally separated wastewater into the outer cylinder;

[0012] A vertical pipe is installed inside the outer cylinder. The upper end of the vertical pipe is connected to a water discharge pipe, and the lower end of the vertical pipe extends into the lower end of the outer cylinder.

[0013] A floating air coil is located at the lower end of the inner cavity of the outer cylinder. The floating air coil has several air jet holes and its air inlet is connected to an external high-pressure air source.

[0014] In the vortex oil separator according to the present invention, an oil collection tank is installed at the upper end of the oil discharge pipe, and the angle between the lower end of the oil discharge pipe and the horizontal direction is 60°-70°.

[0015] In the cyclone oil separator according to the present invention, the sediment discharge pipe is at an angle of 10°-15° to the horizontal direction.

[0016] In the cyclone oil separator according to this utility model, the lower end of the sludge discharge pipe forms an angle of 60°-70° with the horizontal direction.

[0017] In the cyclone separator according to this utility model, the upper end of the outer cylinder is provided with a slag collection cylinder height adjustment device. The slag collection cylinder height adjustment device includes a lower connecting pipe, an upper connecting pipe, and a movable rod. The lower connecting pipe is fixedly installed on the top of the outer cylinder, and the lower end of the lower connecting pipe is connected to the interior of the outer cylinder. The upper connecting pipe is fixedly installed on the lower connecting pipe. The lower end of the movable rod is fixedly connected to one side of the slag collection cylinder. The upper end of the movable rod slides through the lower connecting pipe and the upper connecting pipe and is then fixedly connected to a limit plate. A handle bolt for fixing the movable rod is threaded on the upper connecting pipe. The bottom of the slag collection cylinder is connected to a connecting pipe. The lower end of the connecting pipe is slidably sleeved on the upper end of the slag discharge pipe. A sealing ring is fixedly installed inside the upper end of the slag discharge pipe.

[0018] In the vortex oil separator according to the present invention, the floating air coil is arranged in a vortex shape.

[0019] In the vortex oil separator according to the present invention, the lower end of the inner cavity of the outer cylinder is connected to a drain pipe.

[0020] In the vortex oil separator according to the present invention, the top of the outer cylinder is connected to a vent pipe.

[0021] This utility model has at least the following beneficial effects:

[0022] By utilizing the centrifugal force of the inner cylinder swirling flow, gravity settling, and the flotation effect of the outer cylinder flotation coil, four-phase separation of oil, suspended solids, sludge, and water can be achieved simultaneously. Compared with traditional gravity separation technology, the separation purity is significantly improved.

[0023] The lower end of the inverted conical inner cylinder enhances centrifugal force, causing sludge particles to be quickly thrown against the cylinder wall and discharged through the sediment discharge pipe; grease floats to the top of the inner cylinder due to density difference and is collected through the oil discharge pipe; suspended solids form scum through air flotation and are captured by the sludge collection cylinder, achieving "multi-phase separation in one machine".

[0024] It can handle oilfield produced fluid with a water content of 70% to 90%, and is suitable for situations with large flow rate changes; the sludge collection cylinder can adjust the liquid level through the sludge collection cylinder height adjustment device to meet the suspended solids collection needs under different processing volumes.

[0025] The sediment discharge pipe is at an angle of 10°-15° to the horizontal direction, and with the inverted conical inner cylinder structure, it accelerates sludge discharge, avoids clogging, ensures stable separation capacity, and is adaptable to complex media containing solid particles.

[0026] The nested layout of the inner and outer cylinders, along with the integrated design of each discharge pipe, the floating air coil 7, and the slag collection cylinder height adjustment device 5, reduces the equipment footprint and facilitates on-site installation and maintenance in the oilfield. Attached Figure Description

[0027] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0028] Figure 1 This is a front view structural diagram of the present invention;

[0029] Figure 2 for Figure 1 A magnified structural diagram of part A in the diagram;

[0030] Figure 3 This is a top view of the outer cylinder of this utility model.

[0031] Explanation of icon numbers:

[0032] 1. Sewage inlet; 2. Sediment discharge pipe; 3. Oil discharge pipe; 31. Oil collection tank; 4. Sludge discharge pipe; 41. Sludge collection cylinder; 5. Sludge collection cylinder height adjustment device; 51. Lower connecting pipe; 52. Upper connecting pipe; 53. Movable rod; 54. Handle bolt; 55. Limiting plate; 6. Discharge port; 7. Air flotation coil; 8. Drainage pipe; 9. Conveying pipe; 10. Filter water discharge pipe; 11. Pipe mixer; 12. Inner cylinder; 13. Outer cylinder; 14. Vent pipe; 15. Baffle plate. Detailed Implementation

[0033] The following will describe in detail the implementation of this application with reference to the accompanying drawings and embodiments, so that the implementation process of how this application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0034] Please refer to Figures 1 to 3 As shown, an embodiment of this utility model provides a vortex oil separator, comprising: an inner cylinder 12 and an outer cylinder 13; the inner cylinder 12 is fixed inside the outer cylinder 13, and a pipeline mixer 11 is installed at the lower end of the outer cylinder 13, with the wastewater inlet 1 of the pipeline mixer 11 connected to the crude oil pipeline. A partition 15 is fixedly connected to the lower end of the inner cylinder 12, and a conveying pipe 9 is installed at the upper end of the inner cylinder. The lower end of the conveying pipe 9 passes through the partition 15 and connects to the outlet of the pipeline mixer 11, with the outlet inclined towards the upper inner wall of the inner cylinder 12. The lower end of the inner cylinder 12 is inverted conical. During operation, the mixed liquid enters the pipeline mixer 11 from the wastewater inlet 1 for initial mixing, and is then sprayed out at an angle through the conveying pipe 9, forming a vortex within the inner cylinder 12. The inverted conical structure, combined with centrifugal force, causes denser sediments to accumulate at the bottom.

[0035] Sediment discharge pipe 2: One end extends into the outer cylinder 13 and connects to the lower end of the inner cylinder 12. Sediments accumulated at the bottom of the inner cylinder 12 are discharged through sediment discharge pipe 2 under the action of gravity.

[0036] Oil discharge pipe 3: One end extends into the outer cylinder 13 and then into the upper part of the inner cylinder 12. Due to the low density of oil, it floats on the surface of the liquid in the upper part of the inner cylinder 12 and is discharged through the oil discharge pipe 3.

[0037] Sludge discharge pipe 4: One end extends into the outer cylinder 13, and the upper end is equipped with a height-adjustable sludge collection cylinder 41. The liquid separated from the inner cylinder 12 enters the outer cylinder 13 through the discharge port 6, and the sludge is collected by the sludge collection cylinder 41 and discharged through the sludge discharge pipe 4.

[0038] Discharge port 6: Located on the inner cylinder 12, it is used to discharge the wastewater separated in the inner cylinder 12 into the outer cylinder 13.

[0039] Vertical pipe and filter water discharge pipe 10: A vertical pipe is installed inside the outer cylinder 13, with its upper end connected to the filter water discharge pipe 10 and its lower end extending into the lower end of the outer cylinder 13. The treated clean water in the outer cylinder 13 is discharged from the filter water discharge pipe 10 through the vertical pipe.

[0040] Flotation coil 7: Located inside the lower end of the outer cylinder 13, it has several air jet holes and the air inlet is connected to an external high-pressure air source. High-pressure gas is ejected through the flotation coil 7 and ejected as tiny bubbles, which combine with suspended solids and float to the surface, making them easy to collect in the sludge collection cylinder 41.

[0041] In this embodiment, an oil collection tank 31 is installed at the upper end of the oil discharge pipe 3, and the lower end of the oil discharge pipe 3 forms an angle of 60°-70° with the horizontal direction. The oil collection tank 31 collects the oil, and the 60°-70° angle facilitates the smooth flow of the oil.

[0042] In this embodiment, the sediment discharge pipe 2 forms an angle of 10°-15° with the horizontal direction. This angle is designed to allow the sediment accumulated at the bottom of the inner cylinder 12 to be discharged more smoothly along the discharge pipe under the influence of gravity. A smaller angle ensures that the sediment can slide down by gravity while avoiding an excessively large angle that would cause the discharge pipe to occupy too much space or affect the structural stability of other parts of the separator.

[0043] In this embodiment, the lower end of the sludge discharge pipe 4 forms an angle of 60°-70° with the horizontal direction. This allows the sludge collected in the sludge collection cylinder 41 to be discharged quickly and smoothly through the discharge pipe under the action of gravity. This angle ensures that the sludge slides down smoothly, reduces the possibility of blockage, and is compatible with the overall structure of the separator, facilitating the collection and processing of the sludge after discharge.

[0044] In this embodiment, the upper end of the outer cylinder 13 is provided with a slag collection cylinder height adjustment device 5. The slag collection cylinder height adjustment device 5 includes a lower connecting pipe 51, an upper connecting pipe 52 and a movable rod 53. The lower connecting pipe 51 is fixedly installed on the top of the outer cylinder 13, and the lower end of the lower connecting pipe 51 is connected to the inside of the outer cylinder 13. The upper connecting pipe 52 is fixedly installed on the lower connecting pipe 51. The lower end of the movable rod 53 is fixedly connected to one side of the slag collection cylinder 41. The upper end of the movable rod 53 slides through the lower connecting pipe 51 and the upper connecting pipe 52 and is then fixedly connected to a limit plate 55. A handle bolt 54 for fixing the movable rod 53 is threaded on the upper connecting pipe 52. The bottom of the slag collection cylinder 41 is connected to a connecting pipe 42. The lower end of the connecting pipe 42 is slidably sleeved on the upper end of the slag discharge pipe 4. A sealing ring 43 is fixedly installed inside the upper end of the slag discharge pipe 4.

[0045] When in use, by loosening the handle bolt 54, the movable rod 53 drives the sludge collection cylinder 41 to slide up and down to adjust the height. The limit plate 55 prevents it from disengaging. The connecting pipe 42 is slidably connected to the sludge discharge pipe 4. The sealing ring 43 ensures a seal, which is convenient for collecting sludge at different liquid levels. After adjusting the height, tighten the handle bolt 54.

[0046] In this embodiment, the flotation coil 7 is arranged in a vortex shape. The vortex design makes the air jet holes more evenly distributed, and the bubbles have more sufficient contact with the suspended matter, thus improving the air flotation effect.

[0047] In this embodiment, a drain pipe 8 is connected to the lower inner end of the outer cylinder 13. This is used to drain residual liquid inside the outer cylinder 13 during equipment maintenance, ensuring cleanliness.

[0048] In this embodiment, a vent pipe 14 is connected to the top of the outer cylinder 13. This balances the air pressure inside and outside the outer cylinder 13, ensuring stable air pressure during equipment start-up, shutdown, and operation.

[0049] Working principle:

[0050] I. Pretreatment stage: The mixed liquid enters and undergoes initial mixing

[0051] 1. Mixed liquor input: Liquid containing grease, suspended solids and sludge enters from sewage inlet 1 and flows into pipeline mixer 11.

[0052] 2. Preliminary mixing: The fan blades of the pipeline mixer 11 forcefully mix the liquid, ensuring its uniform distribution, in preparation for subsequent separation. The mixed liquid is then conveyed upwards through the delivery pipe 9 to the upper end of the inner cylinder 12.

[0053] II. Core Separation Stage: Inner Cylinder 12 Swirl Separation

[0054] 1. Swirl Formation: The outlet of the delivery pipe 9 is inclined towards the upper inner wall of the inner cylinder 12, and the liquid forms a high-speed swirling flow inside the inner cylinder 12 after being sprayed out. The lower end of the inner cylinder 12 is inverted conical, which enhances the centrifugal force generated by the swirling flow.

[0055] 2. Initial separation of the three phases:

[0056] Sludge separation: Dense sludge particles are thrown against the cylinder wall by centrifugal force, slide down the inverted conical inner cylinder 12 to the bottom, and are discharged through the sediment discharge pipe 2.

[0057] Grease rises: Because the density of grease is less than that of water, it floats to the liquid surface inside the inner cylinder 12, is collected through the top oil collection tank 9, and is discharged through the oil discharge pipe 3.

[0058] Liquid containing suspended solids flows out: The separated liquid (containing suspended solids) flows from the discharge port 6 of the inner cylinder 12 into the annular space between the outer cylinder 13 and the inner cylinder 12.

[0059] III. Advanced Treatment Stage: Separation of Air Flotation and Suspended Solids in Outer Cylinder 13

[0060] 1. Air flotation: The air flotation coil 7 at the bottom of the outer cylinder 13 is connected to a high-pressure air source, and tiny air bubbles are released through the air jet holes. The air bubbles combine with suspended matter in the liquid to form an air-solid complex, which floats to the surface of the liquid due to buoyancy.

[0061] 2. Suspended solids collection: Suspended solids on the liquid surface are captured by the sludge collection cylinder 41 and discharged through the sludge discharge pipe 4. The height of the sludge collection cylinder 41 can be adjusted by the sludge cylinder height adjustment device 5 to adapt to different liquid levels.

[0062] IV. Clean Water Discharge and Equipment Auxiliary Functions

[0063] 1. Clean water discharge: The separated clean water sinks to the bottom of the outer cylinder 13 under gravity and is discharged from the filter water discharge pipe 10 through the vertical pipe, achieving standard discharge or reuse.

[0064] 2. Function of auxiliary structures:

[0065] Drain pipe 8: Located at the bottom of the outer cylinder 13, used to drain residual liquid during equipment maintenance;

[0066] Vent pipe 14: Located at the top of outer cylinder 13, it balances the internal air pressure and ensures a stable separation process.

[0067] The foregoing description illustrates and describes several preferred embodiments of the present invention. However, as previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the present invention's conception through the foregoing teachings or related technical or knowledge. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A centrifugal oil removal separator, characterized in that include: The inner cylinder (12) and the outer cylinder (13) are fixed inside the outer cylinder (13). A pipe mixer (11) is installed at the lower end of the outer cylinder (13). The sewage inlet (1) of the pipe mixer (11) is connected to the crude oil pipeline. A partition (15) is fixedly connected to the lower end of the inner cylinder (12). A conveying pipe (9) is provided at the upper end of the inner cylinder (12). The lower end of the conveying pipe (9) is fixedly inserted through the partition (15) and extends into the lower end of the inner cylinder (12) and is connected to the outlet of the pipe mixer (11). The outlet of the conveying pipe (9) is inclined towards the upper inner wall of the inner cylinder (12). The lower end of the inner cylinder (12) is set in an inverted cone shape. Sediment discharge pipe (2), one end of which extends into the outer cylinder (13) and is connected to the lower end of the inner cylinder (12); Oil spill discharge pipe (3), one end of which extends into the outer cylinder (13) and then passes through the upper end of the inner cylinder (12); Sludge discharge pipe (4), one end of which extends into the interior of the outer cylinder (13), and a sludge collection cylinder (41) is installed at the upper end of the sludge discharge pipe (4) with adjustable height; The inner cylinder (12) has a discharge port (6) for discharging the internally separated sewage into the outer cylinder (13); A vertical pipe is installed inside the outer cylinder (13), the upper end of the vertical pipe is connected to a water discharge pipe (10), and the lower end of the vertical pipe extends into the lower end of the outer cylinder (13); The floating air coil (7) is located at the lower end of the inner cavity of the outer cylinder (13). The floating air coil (7) has several air jet holes and the air inlet of the floating air coil (7) is connected to an external high-pressure air source.

2. The hydrocyclone deoiling separator according to claim 1, characterized in that: The upper end of the oil discharge pipe (3) is equipped with an oil collection tank (31), and the lower end of the oil discharge pipe (3) has an angle of 60°-70° with the horizontal direction.

3. The hydrocyclonic deoiling separator of claim 1, wherein: The sediment discharge pipe (2) has an angle of 10°-15° with the horizontal direction.

4. The hydrocyclonic deoiling separator of claim 1, wherein: The lower end of the sludge discharge pipe (4) forms an angle of 60°-70° with the horizontal direction.

5. The hydrocyclonic deoiling separator of claim 4, wherein: The upper end of the outer cylinder (13) is provided with a slag collection cylinder height adjustment device (5). The slag collection cylinder height adjustment device (5) includes a lower connecting pipe (51), an upper connecting pipe (52), and a movable rod (53). The lower connecting pipe (51) is fixedly installed on the top of the outer cylinder (13), and the lower end of the lower connecting pipe (51) is connected to the interior of the outer cylinder (13). The upper connecting pipe (52) is fixedly installed on the lower connecting pipe (51). The lower end of the movable rod (53) is connected to the slag collection cylinder (41). The upper end of the movable rod (53) slides through the lower connecting pipe (51) and the upper connecting pipe (52) and is then fixedly connected to a limiting plate (55). A handle bolt (54) for fixing the movable rod (53) is threaded on the upper connecting pipe (52). The bottom of the sludge collection cylinder (41) is connected to a connecting pipe (42). The lower end of the connecting pipe (42) is slidably sleeved on the upper end of the sludge discharge pipe (4). A sealing ring (43) is fixedly installed inside the upper end of the sludge discharge pipe (4).

6. The hydrocyclonic deoiling separator of claim 1, wherein: The air coil (7) is arranged in a vortex shape.

7. The cyclone separator for oil removal according to claim 1, characterized in that: The lower end of the inner cavity of the outer cylinder (13) is connected to a drain pipe (8).

8. The cyclone separator for oil removal according to any one of claims 1-7, characterized in that: The top of the outer cylinder (13) is connected to a vent pipe (14).

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