A vertical induced jet cyclonic flotation separation device

Abstract

The invention discloses a vertical induced jet flow cyclone floatation separation device, which comprises a vertical separation tank, a cyclone cylinder and a central oil collecting cylinder are arranged in the vertical separation tank, a flow equalizer is fixed at the top end of the cyclone cylinder, the central oil collecting cylinder is installed in the cyclone cylinder and the top thereof is connected with the flow equalizer provided with a cyclone breaking plate; the central oil collecting cylinder is provided with an oil overflow pipe, oil-water separation blades and an oil collecting cover, the oil-water separation blades and the oil collecting cover are respectively arranged at the outside and the lower end of the oil overflow pipe, and an induced cyclone blade is further arranged above the oil collecting cover. The invention comprehensively uses gravity sedimentation separation, cyclone separation, air floatation separation and jet secondary reflux strengthening separation technology, solves the conflictive contradiction between the flow distribution ratio and the separation efficiency, has the advantages of compact structure, simple operation, high performance, easy maintenance, and is especially suitable for air floatation separation treatment of oily sewage in areas with high compactness requirement of equipment, such as onshore oil field upgrading and transformation sites or offshore oil production platforms.

Description

Technical Field

[0001] The invention relates to a cyclone floatation separation device for oily sewage in the petroleum industry, in particular to a vertical induced jet cyclone floatation separation device. Background Art

[0002] Crude oil extraction and processing generate large amounts of oily wastewater. This wastewater primarily contains crude oil, suspended solids, hazardous gases, organic matter, a large amount of suspended solids, and chemical agents. It is a special type of refractory organic wastewater. If discharged directly without treatment or treatment that fails to meet discharge standards, it will cause serious pollution to the surrounding environment, including water bodies and soil. In particular, in order to protect the environment, my country has put forward more stringent requirements for the effective treatment of oily wastewater.

[0003] Conventional treatment processes for oily wastewater mainly include deep treatment processes such as pre-separation, biochemical treatment and filtration. The pre-separation process is mainly for removing crude oil and other suspended substances and other harmful substances. Commonly used technologies include sedimentation, centrifugation, flotation and other technologies. Flotation technology uses the selective adhesion characteristics between tiny bubbles and oil droplets or suspended matter to achieve rapid separation of oil and water. Conventional flotation devices usually use flotation tanks or horizontal flotation tanks for flotation separation. Such equipment generally has problems such as large footprint, low degree of sealing, and high operation and maintenance costs. This not only leads to lengthy sewage treatment processes and large equipment footprint, but also high equipment investment, infrastructure, and operation and maintenance costs.

[0004] Existing cyclone flotation technology, also known as Compact Flotation Uni (CFU), is a highly efficient and compact flotation technology that couples flotation separation with cyclone separation within a vertical separation tank. It boasts advantages such as compact structure, high separation efficiency, and low operating and maintenance costs, and has garnered widespread attention. Domestic equipment manufacturers have also launched a variety of cyclone flotation treatment engineering equipment. The application of these devices in offshore oilfields has demonstrated that for oil-rich wastewater with an oil content of less than 200 mg / L, the oil content at the outlet of the treated water can be reduced to 15-20 mg / L after treatment with a single unit. Degassing is also achieved, and the hydraulic retention time is approximately one-fifth that of traditional flotation devices, demonstrating excellent treatment efficiency, compactness, and stability.

[0005] With the increasing water content of oilfield produced fluids and increasingly stringent emission standards, current mainstream cyclone flotation technology generally requires two or even multiple stages in series to meet the high requirements of oilfield sites for treatment performance indicators such as separation efficiency and floor space. Therefore, further improving the separation performance of existing single-stage cyclone flotation units will help further optimize the oily wastewater treatment process and achieve the goals of energy conservation, consumption reduction, and emission reduction.

[0006] Chinese patent CN110902758A discloses "single-stage, multi-stage, and variable-stage cyclone flotation oily wastewater treatment devices." This device achieves improved overall separation efficiency by dividing a single vertical tank into multiple separation zones, sacrificing individual separation efficiency. While this improved separation efficiency, the device requires a certain amount of oil and gas-rich phase to be discharged at each stage during operation to maintain this efficiency. This increases the amount of enriched phase discharged, significantly increasing the difficulty of secondary treatment. Field applications have shown limited improvement in separation efficiency.

[0007] Chinese patent CN106865673A discloses a "secondary cyclone flotation oily wastewater treatment device". In this patent, cyclone blades are provided at the lower part of the annular cyclone separation zone in the traditional cyclone flotation tank. The blades are used to enhance the cyclone separation process and improve the oil-water separation efficiency, but the improvement in efficiency is very limited.

[0008] Chinese patent CN110482635A discloses a "cyclone flotation device for treating oil and gas field wastewater." The device sets a cyclone separation zone and a sedimentation separation zone in a separation tank. The liquid level in the tank is high enough to reduce the impact of the treated water on the oil and gas enrichment layer during the flow from the cyclone separation zone to the sedimentation separation zone.

[0009] Overall, after years of development, the types and models of cyclone flotation equipment have continued to increase, and the compactness and separation efficiency have also been continuously improved. However, looking at the cyclone flotation equipment solutions that have been publicly disclosed by various domestic and foreign units, there are still common problems such as low separation efficiency, large footprint, and high operation and maintenance costs. In particular, it is difficult to meet the requirements of offshore oil and gas development and restricted area transformation and upgrading for the separation efficiency and footprint of single flotation equipment, which greatly increases the cost of oily wastewater treatment and reduces economic and environmental benefits. Summary of the Invention

[0010] The present invention aims to provide a vertical induced jet cyclone flotation separation device with a compact structure and simple operation, thereby resolving the problems of existing cyclone flotation separation devices, such as large floor space requirements and high operating and maintenance costs. The device also aims to improve the separation efficiency of oily wastewater and reduce production costs.

[0011] The technical solution of the present invention is:

[0012] A vertical induced jet cyclone flotation separation device includes a vertical separation tank provided with an oily wastewater inlet, an oil outlet, a sewage outlet, and a water outlet, wherein:

[0013] The vertical separation tank is equipped with a cyclone cylinder and a central oil collecting cylinder. A flow equalizer is fixed on the top of the cyclone cylinder. The central oil collecting cylinder is installed in the cyclone cylinder and the top is connected to the flow equalizer with a cyclone-breaking plate.

[0014] The central oil collecting cylinder is equipped with an oil overflow pipe, oil-water separation blades and an oil collecting cover. The outside and lower end of the oil overflow pipe are respectively provided with oil-water separation blades and an oil collecting cover. An inducing swirl blade is also provided on the oil collecting cover.

[0015] The oily wastewater inlet is installed in the cyclone from the outside of the vertical separation tank, the oil discharge port is installed at the top of the vertical separation tank, the sewage discharge port is located at the bottom of the vertical separation tank, and the water outlet is located above the sewage discharge port.

[0016] Preferably, the oil-water separation blades in the central oil collecting cylinder are plates arranged along the axial direction of the oil overflow pipe, and the oil collecting cover is a conical cover connected to the lower end of the oil overflow pipe.

[0017] Preferably, the lower end of the oil-water separation blade is connected to the oil collecting hood, and the induced swirl blades are evenly distributed on the oil collecting hood around the oil-water separation blade.

[0018] Preferably, there are at least three oil-water separation blades; the spiral angle of the induced swirl blade is set between 35 degrees and 55 degrees; the outside of the oil-water separation blade is also provided with a blade reinforcement pipe, which is arranged corresponding to the oily wastewater inlet.

[0019] Preferably, the flow equalizer is provided with a swirl-breaking plate and a top plate, an oil overflow hole is provided in the top plate, and the swirl-breaking plate is vertically fixed to the lower end of the top plate around the oil overflow hole.

[0020] Preferably, at least three swirl-breaking plates are provided and the outer diameter of the swirl-breaking plates is larger than the outer diameter of the central oil collecting cylinder, and the shape of the lower end of the swirl-breaking plates is consistent with the top shape of the swirl cylinder; the oil overflow hole is equal to or larger than the outer diameter of the oil overflow pipe.

[0021] Preferably, the outer diameter of the cyclone is smaller than the inner diameter of the vertical separation tank and larger than the outer diameter of the central oil collecting cylinder, and a sewage inlet pipe perforation is provided at a position corresponding to the oily sewage inlet and the blade reinforcement pipe on the upper part of the cyclone; the cyclone is fixed to the vertical separation tank by a connecting rod and the lower end of the cylinder is a bell-mouth structure.

[0022] Preferably, a vortex breaking cover is fixed below the oil collecting cover of the central oil collecting cylinder through a connecting rod. The structure of the vortex breaking cover is consistent with or similar to that of the oil collecting cover and is fixed above the drain outlet.

[0023] Preferably, an overflow cover is installed between the flow equalizer and the tank top of the vertical separation tank. The overflow cover is a conical cover that is small at the top and large at the bottom. The upper end of the cover body of the overflow cover is an overflow port that passes through the tank top of the vertical separation tank, and the lower end of the cover body is fixed to the inner wall of the vertical separation tank below the oil drain port.

[0024] Preferably, the vertical separation tank is coaxial and concentric with the overflow cover, flow equalizer, cyclone cylinder, central oil collecting cylinder and vortex breaker; changing the sizes of the vertical separation tank, oily wastewater inlet, cyclone cylinder and central oil collecting cylinder can adjust the annular jet circulation ratio of the oily wastewater; changing the conical angle of the oil collecting cover and the spiral angle of the induced swirl blade can adjust the swirl intensity during the cyclonic flotation separation process of the oily wastewater.

[0025] Compared with the existing conventional cyclone flotation separation device, the present invention has the following remarkable effects and features:

[0026] (1) The present invention comprehensively utilizes gravity sedimentation separation, cyclone separation, flotation separation, and jet secondary reflux enhanced separation technology to naturally form an oil phase separation zone, a primary cyclone separation zone, a secondary jet zone, a secondary cyclone separation zone, and a water phase clarification zone from top to bottom in a vertical separation tank, thereby resolving the conflict between the diversion ratio and the separation efficiency. By using the enhanced induced jet formed by the induced cyclone blades and the annular flow formed by the oil collecting hood of the central oil collecting cylinder, efficient oil-water separation at a low diversion ratio can be achieved. Compared with conventional cyclone flotation devices or compact flotation equipment, the water content in the discharge liquid at the oil outlet can be greatly reduced, thereby reducing the difficulty of secondary treatment.

[0027] (2) The central oil collecting cylinder provided in the present invention changes the concept of swirl first and then separation in traditional cyclonic flotation or compact flotation equipment, and realizes the process of oil-water separation while swirl, effectively achieving the purpose of rapid pre-separation of oil and water. At the same time, the oil overflow pipe in the center of the central oil collecting cylinder also provides a circulation channel for the oil phase separated in the lower area, thereby achieving the purpose of strengthening the oil-water separation process. This device can adjust the flow rate of oil-water pre-separation in the first-level swirl separation area and the flow rate of jet circulation in the second-level jet area by adjusting the outer diameter and length of the oil-water separation blades on the outer wall of the oil overflow pipe in the central oil collecting cylinder and the inner diameter of the oil overflow pipe to adapt to different incoming liquids and treatment requirements. For example, when facing a working condition with a high oil concentration in sewage, the outer diameter of the oil-water separation blades can be increased to increase the volume between the blades, and the inner diameter of the oil overflow pipe can be increased to increase the cross-sectional area of ​​the floating channel of the oil phase in the center of the central oil collecting cylinder.

[0028] (3) Compared with conventional cyclone flotation or compact flotation equipment, the present invention utilizes the jet negative pressure effect caused by the induced swirl blade to form an annular flow channel around the swirl tube. The oil and gas enriched phase formed by the primary swirl separation formed at the oily wastewater inlet and the secondary swirl separation formed by the induced swirl blade enter the oil phase separation area at the upper part of the vertical separation tank through the central oil collecting cylinder and the flow equalizer. After sedimentation separation, the oil phase is collected by the overflow cover and discharged through the oil outlet. The remaining water phase flows downward through the annular space formed by the inner wall of the vertical separation tank and the outer wall of the swirl tube, and is refluxed to the secondary swirl separation area at the lower part of the vertical separation tank by the jet negative pressure effect for further separation. This device can be designed specifically according to the on-site working conditions. By adjusting the inner and outer diameters of the central oil collecting cylinder and the swirl tube, the circulation flow rate can be adjusted to adapt to different incoming liquids and treatment requirements.

[0029] (4) The present invention has the advantages of compact structure, no moving parts, easy installation and operation, low operation and maintenance costs, and high separation efficiency. It can enhance separation efficiency while reducing the difficulty of secondary treatment; it is conducive to simplifying the oily wastewater treatment process and reducing investment. With its compact structure, simple operation, high performance, and easy maintenance, it is particularly suitable for flotation separation treatment of oily wastewater in areas with limited space during onshore oilfield upgrades and renovations, or in areas such as offshore platforms where high compactness is required.

[0030] In engineering applications, the device can be used for flotation separation of oily wastewater in both onshore and offshore oilfields, replacing the complex and energy-intensive conventional flotation separation equipment currently used. Furthermore, the device can be used for oily wastewater separation in skid-mounted modular oil wells in marginal oilfields, reducing investment costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0032] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0033] Figure 2 for Figure 1 Schematic diagram of the structure of the current equalizer.

[0034] Figure 3 for Figure 1 Front view of the central oil collecting drum structure diagram.

[0035] Figure 4 for Figure 3 Schematic diagram of the three-dimensional structure.

[0036] Figure 5 yes Figure 3 Top view of .

[0037] Figure 6 This is a schematic diagram of the arrangement of the induced swirl blades on the oil collecting hood.

[0038] Figure 7 yes Figure 6 Top view of .

[0039] Figure 1 Middle: vertical separation tank 1, cyclone tube 2, central oil collecting tube 3, induced swirl blade 4, vortex breaker 5, flow equalizer 6, overflow cover 7, oily wastewater inlet 11, oil discharge port 12, sewage discharge port 13, water outlet 14.

[0040] Figure 2 Middle: top plate 61, oil overflow hole 62, and de-spinning plate 63.

[0041] Figure 3 - Figure 7 Middle: oil-water separation blade 31, oil collecting cover 32, oil overflow pipe 33, blade reinforcement pipe 34. DETAILED DESCRIPTION

[0042] The accompanying drawings are for reference and illustration purposes only and are not intended to limit the scope of protection of the present invention. The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0043] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0044] In the description of the present invention, it should be understood that the terms "length," "width," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," and the like, indicating positions or location relationships, are based on the positions or location relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, in the description of the present invention, "plurality" means two or more, unless otherwise expressly and specifically defined.

[0045] See also Figure 1 - Figure 7A vertical induced jet cyclone flotation separation device includes a vertical separation tank 1 provided with an oily wastewater inlet 11, an oil outlet 12, a sewage outlet 13 and a water outlet 14, wherein:

[0046] The vertical separation tank 1 is equipped with a cyclone tube 2 and a central oil collecting tube 3. A flow equalizer 6 is fixed on the top of the cyclone tube 2. The central oil collecting tube 3 is installed in the cyclone tube 2 and the top is connected to the flow equalizer 6 with a cyclone-breaking plate 63.

[0047] The central oil collecting cylinder 3 is provided with an oil overflow pipe 33, an oil-water separation blade 31 and an oil collecting cover 32. The oil overflow pipe 33 is provided with an oil-water separation blade 31 and an oil collecting cover 32 at the outside and the lower end thereof respectively. An inducing swirl blade 4 is also provided on the oil collecting cover 32.

[0048] The oily wastewater inlet 11 is installed in the cyclone 2 from the outside of the vertical separation tank 1, the oil discharge port 12 is installed at the top of the vertical separation tank 1, the sewage discharge port 13 is located at the bottom of the vertical separation tank 1, and the water outlet 14 is located above the sewage discharge port 13.

[0049] The present invention comprises a cyclone 2, a flow equalizer 6, and a central oil collection drum 3. The oily wastewater inlet 11 extends from the exterior of the self-supporting separation tank 1 into the interior of the cyclone 2. A swirl-breaking plate 63 is provided in the flow equalizer 6, fixed to the top of the cyclone 2. Oil-water separation blades 31 and an oil collection hood 32 are respectively provided on the exterior and lower end of the oil overflow pipe 33 in the central oil collection drum 3. Inducing swirl blades 4 are also provided above the oil collection hood 32. When the oily wastewater enters the cyclone 2 from the self-supporting separation tank 1, gravity causes separation along the oil-water separation blades 31 on the exterior of the oil overflow pipe 33 in the annular space between the cyclone 2 and the central oil collection drum 3. The oil phase in the oily wastewater migrates upward, while the water phase moves downward. At this point, the downwardly migrating water phase still contains some oil. Because the inducing swirl blades 4 are positioned above the oil collection hood 32 and between the cyclone 2 and the oil collection hood 32, the inducing swirl blades 4 are able to separate some of the oil. The separated oil can then be transported upward along the oil collecting cover 32 and the oil overflow pipe 33 to the flow equalizer 6, and then discharged into the oil and gas gathering pipeline through the oil discharge port 12. Due to the arrangement of the cyclone cylinder 2, the central oil collecting cylinder 3, and the flow equalizer 6, the vertical separation tank 1 of the present invention is naturally divided from top to bottom into an oil phase separation zone, a primary cyclone separation zone, a secondary jet zone, a secondary cyclone separation zone, and a water phase clarification zone.

[0050] The main oil phase separated by the present invention is discharged from the oil outlet 12, the main water phase is discharged from the lower drain outlet 14, and the suspended matter and other medium sediment materials separated by cyclonic flotation are discharged through the sewage outlet 13 at the bottom.

[0051] Based on the first embodiment, the present invention also has the following embodiments

[0052] A preferred embodiment: the oil-water separation blade 31 in the central oil collecting cylinder 3 is a plate body arranged along the axial direction of the oil overflow pipe 33, and the oil collecting cover 32 is a conical cover connected to the lower end of the oil overflow pipe 33. The conical oil collecting cover 32 has a gathering and suction effect on the oil phase there.

[0053] In a preferred embodiment, the lower ends of the oil-water separation blades 31 are connected to the oil collecting hood 32, and the induced swirl blades 4 are evenly distributed on the oil collecting hood 32 around the oil-water separation blades 31. The lower ends of the oil-water separation blades 31 are fixedly connected to the oil collecting hood 32, which makes the structure between the oil collecting hood 32 and the oil-water separation blades 31 more stable.

[0054] In a preferred embodiment, at least three oil-water separation blades 31 are provided; the helical angle of the induced swirl blades 4 is set between 35 and 55 degrees; and blade reinforcement tubes 34 are provided on the exterior of the oil-water separation blades 31, corresponding to the oily wastewater inlet 11. Blade reinforcement tubes 34 straighten and reinforce the oil-water separation blades 31, while also dispersing wastewater entering the cyclone 2.

[0055] In a preferred embodiment, the flow equalizer 6 is provided with a swirl-breaking plate 63 and a top plate 61 . An oil overflow hole 62 is provided in the top plate 61 . The swirl-breaking plate 63 is vertically fixed to the lower end of the top plate 61 around the oil overflow hole 62 .

[0056] In a preferred embodiment, at least three swirl-breaking plates 63 are provided, and their outer diameter is larger than that of the central oil collecting barrel 3. The lower end of each swirl-breaking plate 63 conforms to the top shape of the cyclone barrel 2. The oil overflow hole 62 is equal to or larger than the outer diameter of the oil overflow pipe 33. The oil overflow pipe 33 can be threadedly connected to the oil overflow hole 62, or the oil overflow pipe 33 can pass through the oil overflow hole 62 and be fixed to the swirl-breaking plates 63 via the wing edge at the top of the oil overflow pipe 33. The flow equalizer 6 secures the central oil collecting barrel 3 within the cyclone barrel 2.

[0057] In a preferred embodiment, the outer diameter of the cyclone 2 is smaller than the inner diameter of the vertical separation tank 1 and larger than the outer diameter of the central oil collection tank 3. A sewage inlet pipe perforation is provided in the upper portion of the cyclone 2, corresponding to the oily wastewater inlet 11 and the blade reinforcement tube 34. The cyclone 2 is secured to the vertical separation tank 1 via a connecting rod, and the lower end of the cyclone is a bell-shaped structure, providing favorable conditions for the sedimentation and uplift of the aqueous and oil phases in the oily wastewater. The area between the cyclone 2 and the oil collection hood 32 of the central oil collection tank 3 forms a secondary jet zone.

[0058] In a preferred embodiment, a vortex breaker 5 is further fixed below the oil collecting hood 32 of the central oil collecting cylinder 3 via a connecting rod. The structure of the vortex breaker 5 is consistent with or similar to that of the oil collecting hood 32 and is fixed above the drain outlet 14. The vortex breaker 5 fixed above the drain outlet 14 is located in the secondary cyclone separation zone of the vertical separation tank 1, and can further collect the oil phase components in the oily wastewater. The oil phase components are then discharged through the vortex breaker 5, the oil collecting hood 32, and the oil overflow pipe 33 into the upper part of the flow equalizer 6 and discharged through the oil outlet 12 to the oil and gas gathering pipeline of the oil production well.

[0059] In a preferred embodiment, an overflow hood 7 is installed between the flow equalizer 6 and the top of the vertical separation tank 1. The overflow hood 7 is a conical hood with a smaller top and a larger bottom. The upper end of the overflow hood 7 forms an overflow port that penetrates the top of the vertical separation tank 1, and the lower end of the hood is fixed to the inner wall of the vertical separation tank 1 below the oil discharge port 12. This allows the oil phase components in the oil phase separation zone of the vertical separation tank 1 to overflow from the overflow port of the overflow hood 7 and be discharged through the oil discharge port 12.

[0060] In a preferred embodiment, the vertical separation tank 1 is coaxial and concentric with the overflow hood 7, flow equalizer 6, cyclone 2, central oil collection hood 3, and vortex breaker 5. Changing the dimensions of the vertical separation tank 1, oily wastewater inlet 11, cyclone 2, and central oil collection hood 3 can adjust the annular jet circulation ratio for the oily wastewater. Changing the taper angle of the oil collection hood 32 and the spiral angle of the induced swirl blades 4 can adjust the swirl intensity during the cyclonic flotation separation of the oily wastewater. Adjusting the angle of the oil collection hood 32 and the shape and spiral inclination of the induced swirl blades 4 can adjust the swirl intensity during the cyclonic flotation separation of the oily wastewater. Adjusting the inner and outer diameters of the cyclone 2, central oil collection hood 3, oil overflow pipe 33, and oil-water separation blades 31 can adjust the annular jet circulation ratio for the oily wastewater.

[0061] During operation, the oily wastewater first enters the annular space formed by the cyclone 2 and the central oil collection tube 3 tangentially from the oily wastewater inlet 11. After cyclonic centrifugal separation, the low-density oil and gas phase swirls into the space between the oil overflow pipe 33 and the oil-water separation blades 31 in the central oil collection tube 3. Utilizing the swirl-breaking action of the vertical oil-water separation blades 31, the oil and gas phase migrates vertically upward along the blades and flows into the equalizer 6. Within the annular space formed by the cyclone 2 and the central oil collection tube 3, the main water phase, after swirl separation, flows downward through the inducing swirl blades 4. After being strengthened by the induced swirl, the main water phase swirls and enters the lower portion of the central oil collection tube 3 for cyclonic flotation separation. The low-density oil and gas phase swirls and converges at the center of the central oil collection tube 3. The oil and gas phase is enriched by the sedimentation principle of the conical hood sloping plates between the oil collection hood 32 and the vortex-breaking hood 5 at the lower portion of the central oil collection tube 3. The enriched oil and gas phase then flows upward along the oil overflow pipe 33 into the equalizer 6. The enriched oil and gas phase flows evenly along the circumference of flow equalizer 6. It floats upward through overflow hole 62, is collected by overflow hood 7, and then overflows from the overflow port of overflow hood 7 and is discharged through oil drain port 12. The remaining water phase flows downward along the annular space between the inner wall of vertical separation tank 1 and the outer wall of cyclone tube 2. Due to the negative pressure effect of the jet caused by the induced swirl action of induced swirl blades 4, it is drawn into the secondary cyclonic separation zone below the induced swirl blades 4, where it merges with the main water flow for further cyclonic separation. The separated main water phase is discharged through drain port 14 below vortex breaker 5. Suspended matter and other medium-sized sediment separated by cyclonic flotation are discharged through bottom drain port 13.

[0062] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A vertical induced jet cyclone flotation separation device, comprising a vertical separation tank (1) provided with an oily wastewater inlet (11), an oil outlet (12), a sewage outlet (13) and a water outlet (14), characterized in that: A cyclone (2) and a central oil collecting cylinder (3) are installed in a vertical separation tank (1). A flow equalizer (6) is fixed at the top of the cyclone (2). The central oil collecting cylinder (3) is installed in the cyclone (2) and the top is connected to the flow equalizer (6) provided with a cyclone breaking plate (63). The central oil collecting cylinder (3) is provided with an oil overflow pipe (33), an oil-water separation blade (31) and an oil collecting cover (32). The outside and the lower end of the oil overflow pipe (33) are provided with an oil-water separation blade (31) and an oil collecting cover (32), respectively. An inducing cyclone blade (4) is also provided on the oil collecting cover (32). The oily wastewater inlet (11) is a self-supporting separation tank. (1) The outside is installed in the cyclone (2), the oil discharge port (12) is installed at the top of the vertical separation tank (1), the sewage discharge port (13) is located at the bottom of the vertical separation tank (1), and the water discharge port (14) is located above the sewage discharge port (13); the flow equalizer (6) is also provided with a top plate (61), the top plate (61) is provided with an oil overflow hole (62), and the cyclone breaking plate (63) is vertically fixed to the lower end of the top plate (61) around the oil overflow hole (62); the outer diameter formed by the cyclone breaking plate (63) is larger than the outer diameter of the central oil collecting cylinder (3), and the shape of the lower end of the cyclone breaking plate (63) is consistent with the shape of the top of the cyclone (2).

2. A vertical induced jet cyclone floatation separation device as claimed in claim 1, characterized in that: The oil-water separation blade (31) in the central oil collecting cylinder (3) is a plate body arranged along the axial direction of the oil overflow pipe (33), and the oil collecting cover (32) is a conical cover connected to the lower end of the oil overflow pipe (33).

3. A vertical induced jet cyclone floatation separation device as claimed in claim 2, characterized in that: The lower end of the oil-water separation blade (31) is connected to the oil collecting cover (32), and the induced swirl blades (4) are evenly distributed on the oil collecting cover (32) around the oil-water separation blade (31).

4. A vertical induced jet cyclone floatation separation device as claimed in claim 1, 2 or 3, characterized in that: The oil-water separation blades (31) are provided with at least three blades; the spiral angle of the induced swirl blade (4) is set between 35 degrees and 55 degrees; the outside of the oil-water separation blade (31) is also provided with a blade reinforcement pipe (34), and the blade reinforcement pipe (34) is arranged corresponding to the oily wastewater inlet (11).

5. The vertical induced jet cyclone floatation separation device according to claim 1, characterized in that: At least three rotation-breaking plates (63) are provided, and the oil overflow hole (62) is equal to or larger than the outer diameter of the oil overflow pipe (33).

6. The vertical induced jet cyclone floatation separation device according to claim 4, characterized in that: The outer diameter of the cyclone (2) is smaller than the inner diameter of the vertical separation tank (1) and larger than the outer diameter of the central oil collecting cylinder (3). A sewage inlet pipe perforation is provided at a position corresponding to the oily sewage inlet (11) and the blade reinforcement pipe (34) on the upper part of the cyclone (2). The cyclone (2) is fixed to the vertical separation tank (1) by a connecting rod, and the lower end of the cylinder is a bell-mouth structure.

7. A vertical induced jet cyclone floatation separation device as claimed in claim 6, characterized in that A vortex breaker (5) is fixed below the oil collecting cover (32) of the central oil collecting cylinder (3) via a connecting rod. The structure of the vortex breaker (5) is consistent with or similar to that of the oil collecting cover (32) and is fixed above the drain outlet (14).

8. A vertical induced jet cyclone floatation separation device as claimed in claim 5, characterized in that An overflow hood (7) is further installed between the flow equalizer (6) and the tank top of the vertical separation tank (1). The overflow hood (7) is a conical hood with a small upper portion and a large lower portion. The upper end of the hood body of the overflow hood (7) is an overflow port that penetrates the tank top of the vertical separation tank (1), and the lower end of the hood body is fixed to the inner wall of the vertical separation tank (1) below the oil discharge port (12).

9. The vertical induced jet cyclone floatation separation device according to claim 8, characterized in that: The vertical separation tank (1) is coaxial and concentric with the overflow cover (7), the flow equalizer (6), the cyclone cylinder (2), the central oil collecting cylinder (3) and the vortex breaker (5); by changing the sizes of the vertical separation tank (1), the oily wastewater inlet (11), the cyclone cylinder (2) and the central oil collecting cylinder (3), the annular jet circulation ratio of the oily wastewater can be adjusted; by changing the conical angle of the oil collecting cover (32) and the spiral angle of the induced swirl blade (4), the swirl intensity during the cyclonic flotation separation process of the oily wastewater can be adjusted.

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