A vertical cyclonic separating apparatus of the screw coil inner cylinder type

Abstract

The present application relates to a kind of spiral coil inner tube type vertical cyclonic float equipment, comprising: tank body;Jet assembly, jet assembly includes straight pipe section, neck nozzle and tangential inlet pipe arranged coaxially and sequentially connected, tangential inlet pipe is communicated with tank body and forms tangential outlet, the outside of neck nozzle is equipped with contraction pipe section, the both ends of contraction pipe section are connected with the side wall of straight pipe section,tangential inlet pipe respectively, and gap is left between contraction pipe section and neck nozzle, to form the gas injection ring cavity being communicated with tangential inlet pipe, gas injection pipe is also provided on contraction pipe section and communicated with gas injection ring cavity;Spiral coil assembly and flow stabilizing cylinder, both are coaxially arranged in tank body, and spiral coil assembly is sleeved on the outside of flow stabilizing cylinder, and tangential inlet of spiral coil assembly is connected with tangential outlet.This equipment improves the float treatment effect to difficult to handle micro oil drop and emulsified oil, with the characteristics of high system integration, no supporting redundant equipment, compact device structure, high separation efficiency etc..

Description

Technical Field

[0001] This invention relates to a vertical cyclone flotation device with an inner cylindrical spiral coil, belonging to the field of air flotation technology for oily wastewater treatment. Background Technology

[0002] Air flotation technology is widely used in wastewater treatment processes in onshore and offshore oilfields due to its simple and reliable structure, stable and efficient performance, and convenient and inexpensive operation and maintenance. However, as major offshore oilfields have entered the mid-to-late stages of exploitation in recent years, the volume of produced water has increased daily. Most existing wastewater treatment processes and equipment on offshore platforms are operating beyond their capacity, resulting in effluent quality failing to meet discharge or reinjection standards. Therefore, offshore oilfields urgently need more efficient and compact air flotation equipment to expand and upgrade wastewater treatment processes within the limited space of the platform.

[0003] To improve the oil removal performance of conventional air flotation (AF) equipment, foreign oilfield service providers have pioneered the coupling and synergistic application of "weak swirling flow field" with "vertical AF." This generates a weak swirling flow field to promote collision and adhesion between bubbles and oil droplets within the vertical tank, thereby enhancing oil removal efficiency. Furthermore, compared to conventional AF equipment, swirling flotation technology significantly reduces hydraulic residence time and increases hydraulic load by orders of magnitude. The EPCON CFU from Norway's MI SWACO AS is a prime example. Its internal components consist of an inner cylinder, spiral guide vanes, and anti-surge plates. Wastewater enters the tank through a tangential inlet pipe and, guided by the spiral guide vanes, forms a gentle swirling motion in the annular gap between the inner cylinder and the tank body, promoting collision and adhesion between microbubbles and oil droplets. Despite the significant commercial success of the EPCON CFU since its launch, there is still considerable room for improvement in oil removal efficiency. Therefore, after Schlumberger (SLB) acquired MI SWACO AS, it proposed an upgraded version of the EPCON CFU: the Dual CFU, featuring a single-tank, two-stage separation function. The main structure of the device consists of a tangential water inlet pipe, spiral guide vanes, a rectifier cylinder with a flared end and a closed top, a vortex generator, a top oil outlet, a secondary oil outlet, and a clean water outlet. Its key feature is the use of a vortex generator to create secondary swirl, increasing the probability of collision and adhesion between oil droplets and microbubbles. The resulting adhering material floats to the liquid surface inside the rectifier cylinder and is ultimately discharged through the secondary oil outlet under the pressure of the top space. Experimental results show that the Dual CFU improves oil removal efficiency by 27% compared to the EPCONCFU.

[0004] A domestic research institute has proposed a cyclone flotation separation device, mainly composed of a tank, guide bends, cyclone chambers, and separators. During operation, oily wastewater enters through the bottom tube bundle and is swirled by the swirl-inducing element. In the cyclone chamber, the oil phase converges towards the center and is discharged through the central primary oil outlet, completing the first-stage separation. The water phase enters the tank through the perforated conical chamber and the tangential guide bend. The resulting weak swirling field accelerates the adhesion of oil droplets and microbubbles, thus accelerating their rise to the liquid surface. The adsorbed material is discharged through the secondary oil outlet under the pressure of the top gas phase, completing the second-stage separation process. The treated wastewater is discharged through the lower outlet of the tank. A university has introduced a vertical multi-stage cyclone flotation oily wastewater treatment device and method, the main structure of which includes a shell, a first-stage separation component, an intermediate-stage separation component, and a tail-stage separation component. By extending the lower part of the water collection hopper in the separation component into the cyclone tube in the same stage separation component and connecting it with two or more nozzles inside the cyclone tube, multi-stage air flotation separation in the tank is achieved. It has the characteristics of low energy loss rate, high bubble utilization rate, compact structure and wide adaptability, but it also has the disadvantages of complex structure and high processing difficulty.

[0005] In summary, to further improve the oil removal performance of cyclone flotation technology, researchers have generally focused on improving and upgrading the internal structure of the tank to achieve single-tank two-stage or single-tank multi-stage design goals. However, there has been little improvement in the supporting microbubble generation method, which still relies on external jet injectors or partial reflux water pressurized dissolved air foaming. Although the cyclone flotation tank structure is relatively compact, the redundant and complex structure of the supporting microbubble generation equipment results in a still large overall skid-mounted volume for the cyclone flotation device. Therefore, designing and developing a new type of cyclone flotation equipment that organically integrates foaming technology and air flotation separation, with characteristics such as wide adaptability to operating conditions, simple operation, low energy consumption, and high oil-water separation efficiency, is of great practical significance. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention provides a vertical cyclone flotation device with an inner spiral coil, which improves the flotation treatment effect on difficult-to-handle micro oil droplets and emulsified oil. It features high system integration, no redundant supporting equipment, compact device structure, and high separation efficiency.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A vertical cyclone flotation device with a spiral coil inner cylinder, comprising:

[0009] Tank body;

[0010] A jet assembly includes a straight pipe section, a necked nozzle, and a tangential water inlet pipe arranged coaxially and connected sequentially. The tangential water inlet pipe is connected to the tank body and forms a tangential outlet. A constriction pipe section is sleeved on the outside of the necked nozzle. The two ends of the constriction pipe section are connected to the side walls of the straight pipe section and the tangential water inlet pipe, respectively. A gap is left between the constriction pipe section and the necked nozzle to form an air injection annular cavity connected to the tangential water inlet pipe. An air injection pipe connected to the air injection annular cavity is also provided on the constriction pipe section.

[0011] The spiral coil assembly and the flow stabilizer are coaxially arranged inside the tank, and the spiral coil assembly is sleeved outside the flow stabilizer. The tangential inlet of the spiral coil assembly is connected to the tangential outlet.

[0012] Preferably, in the spiral coil type vertical cyclone flotation device, the spiral coil assembly includes a spiral coil and a pressure-reducing and gas-releasing nozzle. The pressure-reducing and gas-releasing nozzle is installed on the inner wall of the downstream section of the spiral coil along the spiral direction. A sealing plate is provided at the fluid outlet of the spiral coil, and a plurality of jet holes are spaced apart on the end wall of the spiral coil.

[0013] Preferably, in the spiral coil-type vertical cyclone flotation device, the pitch of the spiral coil is the same as its outer diameter, the number of turns is 6-8, and the inner diameter of the hollow cylinder formed by the spiral coil is 2 / 3 to 4 / 5 of the inner diameter of the tank.

[0014] Preferably, in the spiral coil inner cylindrical vertical cyclone flotation device, the inner diameter of the pressure-reducing and gas-releasing nozzle is 1 / 4 to 1 / 3 of the inner diameter of the spiral coil, the angle between the axial coordinate of the pressure-reducing and gas-releasing nozzle and the tangential coordinate of the spiral coil is 10° to 15°, and the number is 4-6.

[0015] Preferably, in the spiral coil inner cylindrical vertical cyclone flotation device, the flow stabilizing cylinder includes a straight cylinder and a flared opening located below the straight cylinder, and a plurality of cyclone-breaking plates are evenly distributed on the inner bottom wall of the straight cylinder.

[0016] Preferably, in the spiral coil type vertical cyclone flotation device, the axial distance from the upper edge of the flow stabilizer cylinder to the center line of the tangential water inlet pipe is 1.5 to 2 times the inner diameter of the tangential water inlet pipe.

[0017] Preferably, in the spiral coil inner cylinder type vertical cyclone flotation device, the inner diameter of the straight cylinder is 1 / 3 to 1 / 2 of the inner diameter of the tank, and the ratio of the height of the straight cylinder to its outer diameter is 2 to 3.

[0018] Preferably, in the spiral coil inner cylinder type vertical cyclone flotation device, the expansion angle of the flared mouth is 45°~60°, and the ratio of the outer diameter of the flared mouth to the inner diameter of the straight cylinder is 1.2-1.4.

[0019] Preferably, in the spiral coil inner cylinder type vertical cyclone flotation device, the height of the cyclone breaking plate is 1 / 6 to 1 / 8 of the height of the straight cylinder, and the width of the cyclone breaking plate is 1 / 8 to 1 / 10 of the inner diameter of the straight cylinder.

[0020] Preferably, the spiral coil inner cylindrical vertical cyclone flotation device further includes an upper end cap and a lower end cap, which are respectively disposed at the upper and lower ends of the tank body. The upper end cap is provided with an oil drain pipe, and the lower end cap is provided with a drain pipe.

[0021] The present invention has the following advantages due to the adoption of the above technical solutions:

[0022] 1. This invention, based on the concept of unit technology integration, couples and coordinates jet dissolved gas bubble formation and swirling air flotation to propose a vertical swirling flotation device with a spiral coil inner cylinder. The gas-liquid two-phase flow is broken into microbubble streams by the jet assembly and enters tangentially into a spiral coil with a closed end. The spiral coil is coaxially installed in the upper part of the tank, serving as a dissolved gas conduit to promote thorough mixing and contact of the bubble stream during the spiral flow, enhancing dissolved gas formation. Microbubbles are generated by pressure-reducing and gas-releasing nozzles arranged in a centripetal inclination at the inner side of the spiral coil's tail. Furthermore, the pressure-reducing and gas-releasing nozzles generate a weak swirling flow field, accelerating the collision and adhesion of microbubbles with suspended solids and dispersed oil droplets in oily wastewater, generating larger adhering masses that float to the liquid surface, completing one separation step. As the treated wastewater flows over the top of the coil and toward the drain outlet, part of the water flow forms an upward and downward circulation under the pressure-reducing and degassing nozzles, increasing the probability of collision and adhesion between tiny oil droplets and microbubbles. The other part of the water flow is stabilized and deswirled by the deswirl plate before entering the central area of ​​the tank to complete a secondary separation process. The oil and solid phases separated by flotation are discharged through the oil drain pipe at the top of the tank under the action of pressure difference, while the water flows out through the drain pipe at the bottom of the tank.

[0023] 2. The device of the present invention improves the air flotation treatment effect on difficult-to-handle micro oil droplets and emulsified oil, and has the characteristics of high system integration, no supporting redundant equipment, compact device structure, and high separation efficiency. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of a spiral coil inner cylindrical vertical cyclone flotation device provided in an embodiment of the present invention;

[0025] Figure 2 This is a cross-sectional structural schematic diagram of the jet assembly provided in this embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the spiral coil assembly provided in this embodiment of the present invention;

[0027] Figure 4This is a cross-sectional structural diagram of the flow stabilizer provided in this embodiment of the present invention;

[0028] The attached figures are labeled as follows:

[0029] 1-Jet assembly; 2-Oil drain pipe; 3-Upper head; 4-Spiral coil assembly; 5-Tank body; 6-Flow stabilizer; 7-Lower head; 8-Support leg; 9-Drain pipe; 10-Pressure relief nozzle; 11-Tangential water inlet pipe; 12-Air injection pipe; 13-Contraction section; 14-Air injection ring cavity; 15-Straight pipe section; 16-Necked nozzle; 41-Tangential inlet; 42-Spiral coil; 43-Jet orifice; 44-Sealing plate; 61-Straight cylinder; 62-Bell mouth; 63-Breaking vortex plate. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention are described clearly and completely below. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0031] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," "third," "fourth," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0032] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "above," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure.

[0033] Currently, to further improve the oil removal performance of cyclone flotation technology, researchers generally focus on improving and upgrading the internal structure of the tank to achieve single-tank two-stage or single-tank multi-stage design goals. However, there has been little improvement in the supporting microbubble generation method, which still relies on external jet injectors or partial reflux water pressurized dissolved air foaming. Although the cyclone flotation tank structure is relatively compact, the redundant and complex structure of the supporting microbubble generation equipment results in a still large overall skid-mounted volume for the cyclone flotation device. Therefore, designing and developing a new type of cyclone flotation equipment that organically integrates foaming technology and air flotation separation, with characteristics such as wide adaptability to working conditions, simple operation, low energy consumption, and high oil-water separation efficiency, is of great practical significance.

[0034] To address the aforementioned technical problems, this invention provides a vertical cyclone flotation device with a spiral coil inner cylinder. Based on the concept of unit technology integration, this device combines jet dissolved gas bubble formation and air flotation separation into the same vertical tank. It innovatively uses a spiral coil structure as the inner cylinder component, which serves as a dissolved gas pipeline to ensure dissolved gas mass transfer time. On the other hand, the nozzles arranged in a centripetal inclination at the inner side of the spiral coil end generate a double vortex, which accelerates the collision and adhesion between oil droplets and microbubbles, improving the air flotation treatment effect for difficult-to-treat micro oil droplets and emulsified oil. It features high system integration, no redundant supporting equipment, compact device structure, and high separation efficiency.

[0035] like Figure 1 As shown, the spiral coil inner cylinder type vertical cyclone flotation device involved in this invention includes: a jet assembly 1, an oil receiving pipe 2, an upper end cap 3, a spiral coil assembly 4, a tank body 5, a flow stabilizing cylinder 6, a lower end cap 7, a support leg 8, a drain pipe 9, a pressure reducing and venting nozzle 10, and a tangential water inlet pipe 11.

[0036] like Figure 2 As shown, the jet assembly 1 includes a tangential water inlet pipe 11, an air injection pipe 12, a contraction section 13, an air injection ring cavity 14, a straight pipe section 15, and a necked nozzle 16. The straight pipe section 15 is coaxially welded or threadedly connected to the tangential water inlet pipe 11. The inner diameter of the air injection pipe 12 is 1 / 5 to 1 / 4 of the inner diameter of the water inlet pipe 11. The contraction angle of the contraction section 13 and the contraction angle of the necked nozzle 16 are both 20° to 25°. The inner diameter of the straight pipe section 15 is 1 / 3 to 1 / 2 of the inner diameter of the water inlet pipe 11.

[0037] like Figure 3As shown, the spiral coil assembly 4 is coaxially mounted on the upper part of the vertical tank 5, including an inlet pipe 41, a spiral coil 42, a jet hole 43, and a sealing plate 44. The sealing plate 44 is sealed to the end of the spiral coil 42 by thread or welding. The pressure-reducing and venting nozzle 10 is installed along the spiral direction on the inner side of the downstream pipe section of the spiral coil 42. The pitch of the spiral coil 42 is the same as the outer diameter of the spiral coil 42, and the number of turns is 6-8. The spiral coil 42 forms a hollow cylinder, and its inner diameter is 2 / 3 to 4 / 5 of the inner diameter of the tank 5. The inner diameter of the pressure-reducing and venting nozzle 10 is 1 / 4 to 1 / 3 of the inner diameter of the spiral coil 42. The angle between the axial coordinate of the pressure-reducing and venting nozzle 10 and the tangential coordinate of the spiral coil 42 is 10° to 15°. The number of pressure-reducing and venting nozzles 10 is 4-6.

[0038] like Figure 4 As shown, the flow stabilizer 6 is coaxially mounted with the spiral coil assembly 4, including a straight cylinder 61, a bell mouth 62, and a swirl-breaking plate 63. The axial distance from the upper edge of the flow stabilizer 6 to the center line of the tangential water inlet pipe 11 is 1.5 to 2 times the inner diameter of the tangential water inlet pipe 11. The swirl-breaking plates 63 are circumferentially and equidistantly installed at the lower edge of the straight cylinder 61. The inner diameter of the straight cylinder 61 is 1 / 3 to 1 / 2 of the inner diameter of the tank body 5, and the ratio of the height to the outer diameter of the straight cylinder 61 is 2 to 3. The expansion angle of the bell mouth 62 is 45° to 60°, and the ratio of the outer diameter of the bell mouth 62 to the inner diameter of the straight cylinder 61 is 1.2 to 1.4. The height of the swirl-breaking plate 63 is 1 / 6 to 1 / 8 of the height of the straight cylinder 61, and the width of the swirl-breaking plate 63 is 1 / 8 to 1 / 10 of the inner diameter of the straight cylinder 61.

[0039] like Figure 1 As shown, in the operation of the spiral coil inner cylindrical vertical cyclone flotation device of the present invention, oily wastewater first draws in air through the injection pipe 12 via the jet assembly 1, breaking it into microbubbles. Then, the oily wastewater mixed with microbubbles enters the spiral coil 42 along the tangential inlet pipe 11, where intense gas-liquid mixing and collision, and dissolved gas mass transfer occur during transport, generating saturated dissolved gas water. Subsequently, the dissolved gas water passes through the pressure-reducing and gas-releasing nozzle 10 arranged concentrically on the inner side of the end of the spiral coil 42, generating high-quality microbubbles. These microbubbles then pass through the pressure-reducing and gas-releasing nozzle 10. In the weak swirling flow field formed by nozzle 10, the oil and solid phases in the oily wastewater are accelerated to collide and adhere, generating larger adhering bodies that float to the surface, completing the first separation. As the treated wastewater flows over the upper edge of the spiral coil 42 and toward the drain pipe 9, part of the water flow forms an upper and lower circulation along the spiral coil 42 under the guidance of the pressure reducing and venting nozzle 10, increasing the probability of collision and adhesion between tiny oil droplets and microbubbles. The other part of the water flow is stabilized and deswirled by the deswirl breaking plate 63 before entering the central area of ​​the tank to complete the secondary separation process. The oil and solid phases separated by flotation are discharged through the oil drain pipe 2 at the top of the tank under the action of pressure difference, while the water flow is discharged through the drain pipe 9 at the bottom of the tank.

[0040] The spiral coil inner cylindrical vertical air flotation device provided by this invention has the following advantages compared with conventional vertical air flotation devices:

[0041] (1) The jet dissolution bubble formation and air flotation separation are organically integrated into the same vertical tank. The spiral coil 42 structure is innovatively used as the inner cylinder component. On the one hand, it ensures the dissolution time required for dissolution bubble formation, and on the other hand, it provides a suitable flow field environment for air flotation separation.

[0042] (2) A pressure-reducing and gas-releasing nozzle 10 is arranged in a centripetal inclination on the inner side of the end of the spiral coil 42, so that while generating high-quality micro bubbles, it generates a double vortex in the tank, which accelerates the collision and adhesion between oil droplets and micro bubbles, and improves the air flotation separation effect of difficult-to-treat micro oil droplets and emulsified oil.

[0043] (3) Change the general method of generating swirling flow in the entire vertical tank by conventional swirling flotation technology. By installing swirl-breaking plate 63 on the lower edge of the flow stabilizer 6, the swirling flow field is rapidly broken and stabilized, thereby providing a stable floating environment for the bubble-oil droplet adhering body and avoiding the breakage of the formed flocs.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A vertical cyclone flotation device with a spiral coil inner cylinder, characterized in that, include: Tank body (5); The jet assembly (1) includes a straight pipe section (15), a necked nozzle (16), and a tangential water inlet pipe (11) arranged coaxially and connected in sequence. The straight pipe section (15) is connected to the tank body (5) and forms a tangential outlet. A constriction pipe section (13) is sleeved on the outside of the necked nozzle (16). The two ends of the constriction pipe section (13) are connected to the side walls of the straight pipe section (15) and the tangential water inlet pipe (11), respectively. A gap is left between the constriction pipe section (13) and the necked nozzle (16) to form an air injection ring cavity (14) connected to the tangential water inlet pipe (11). An air injection pipe (12) connected to the air injection ring cavity (14) is also provided on the constriction pipe section (13). The spiral coil assembly (4) and the flow stabilizer (6) are coaxially arranged inside the tank (5), and the spiral coil assembly (4) is sleeved outside the flow stabilizer (6). The tangential inlet (41) of the spiral coil assembly (4) is connected to the tangential outlet. The spiral coil assembly (4) includes a spiral coil (42) and a pressure-reducing and gas-releasing nozzle (10). The pressure-reducing and gas-releasing nozzle (10) is installed on the inner side wall of the downstream pipe section of the spiral coil (42) along the spiral direction. A sealing plate (44) is provided at the fluid outlet of the spiral coil (42). A plurality of jet holes (43) are spaced apart on the end pipe wall of the spiral coil (42).

2. The spiral coil inner cylindrical vertical cyclone flotation device according to claim 1, characterized in that, The pitch of the spiral coil (42) is the same as its outer diameter, and the number of turns is 6-8. The inner diameter of the hollow cylinder formed by the spiral coil (42) is 2 / 3 to 4 / 5 of the inner diameter of the tank body (5).

3. The spiral coil inner cylindrical vertical cyclone flotation device according to claim 1, characterized in that, The inner diameter of the pressure-reducing and gas-releasing nozzle (10) is 1 / 4 to 1 / 3 of the inner diameter of the spiral coil (42). The angle between the axial coordinate of the pressure-reducing and gas-releasing nozzle (10) and the tangential coordinate of the spiral coil (42) is 10° to 15°, and the number of nozzles is 4-6.

4. The spiral coil inner cylindrical vertical cyclone flotation device according to claim 1, characterized in that, The flow stabilizer (6) includes a straight cylinder (61) and a flared opening (62) located below the straight cylinder (61). Several swirl-breaking plates (63) are evenly distributed on the inner bottom wall of the straight cylinder (61).

5. The spiral coil inner cylindrical vertical cyclone flotation device according to claim 1, characterized in that, The axial distance from the upper edge of the flow stabilizer (6) to the center line of the tangential water inlet pipe (11) is 1.5 to 2 times the inner diameter of the tangential water inlet pipe (11).

6. The spiral coil inner cylindrical vertical cyclone flotation device according to claim 4, characterized in that, The inner diameter of the straight cylinder (61) is 1 / 3 to 1 / 2 of the inner diameter of the tank body (5), and the ratio of the height of the straight cylinder (61) to its outer diameter is 2 to 3.

7. The spiral coil inner cylindrical vertical cyclone flotation device according to claim 4, characterized in that, The expansion angle of the flared mouth (62) is 45°~60°, and the ratio of the outer diameter of the flared mouth (62) to the inner diameter of the straight cylinder (61) is 1.2-1.

4.

8. The spiral coil inner cylindrical vertical cyclone flotation device according to claim 4, characterized in that, The height of the swirl-breaking plate (63) is 1 / 6 to 1 / 8 of the height of the straight cylinder (61), and the width of the swirl-breaking plate (63) is 1 / 8 to 1 / 10 of the inner diameter of the straight cylinder (61).

9. The spiral coil inner cylindrical vertical cyclone flotation device according to claim 1, characterized in that, It also includes an upper end cap (3) and a lower end cap (7), which are respectively located at the upper and lower ends of the tank body (5). The upper end cap (3) is provided with an oil drain pipe (2), and the lower end cap (7) is provided with a drain pipe (9).

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