Compact gas flotation cyclone device

Abstract

The application discloses a compact gas floatation cyclone device and relates to the technical field of oil-water separation. The device comprises an upper tank body, a lower tank body, a feeding pipe, an oil discharge port, a pipe assembly composed of a water guide pipe, an oil guide pipe, a gas guide pipe and a jet pipe, an air discharge pipe, an oil collecting pipe and the like. High-pressure production water with dissolved saturated gas enters from the feeding pipe, is preliminarily stratified under the action of gas floatation, then enters the lower chamber through the pipe assembly, gas is mixed into the liquid again, and the gas-liquid generates a strong cyclone in the same direction under the action of the jet pipe. In the process of cyclone, water and oil are separated due to different densities, and gas is further separated out of the liquid. The compact gas floatation cyclone device can fully recover fine oil drops in oilfield production water, on the one hand, so that the production water reaches the environmental protection oil content standard, and on the other hand, the recovered oil has economic value. The whole device is compact, small in size and large in processing capacity, and has full adaptability to land and sea.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil-water separation, in particular to a compact gas flotation cyclone device. BACKGROUND

[0002] At present, the implementation of environmental protection requirements is gradually increasing, and the oil price is gradually rising, which leads to the increase in demand for production water treatment equipment. On the one hand, the production water can meet the environmental protection standards, and on the other hand, the recovered oil products have economic value. The current mainstream technologies include cyclone separation technology and gas flotation technology. The principle of cyclone separation technology is to separate oil and water with different densities by means of centrifugal force. The cyclone equipment has the advantages of large water treatment capacity, fast treatment speed, and the ability to capture smaller oil droplets. The gas flotation technology is to introduce air into the oil-containing sewage, so that gas is generated in the water, the dispersed oil droplets in the water adhere to the gas bubbles, and float to the water surface with the gas bubbles, so as to achieve the purpose of oil removal of the oil-containing sewage.

[0003] In recent years, people have been continuously researching and improving the oil-water separation process and equipment of high-pressure production water, such as combining gas flotation and cyclone in the same equipment to reduce the equipment volume. However, it is found that when gas flotation and cyclone act at the same time, they will interfere with each other. The main reason is that the cyclone generated by the cyclone nozzle presents the characteristics of strong upper layer and weak lower layer, and the bubbles are mainly concentrated in the upper layer and play a role. In this case, although the gas flotation and the cyclone are in the same space, the competition for space between the gas flotation and the cyclone is very obvious. At the same time, a large number of bubbles generated will easily affect the cyclone speed, and the cyclone resistance will increase. The cyclone and the gas flotation act in the same space, and the action time is not enough, which will limit the treatment capacity to be very low. The treatment capacity of the same volume of equipment is greatly reduced, and it cannot be solved by simply lengthening or heightening the equipment because the cyclone resistance is large and the effective area of the cyclone is limited. Therefore, in actual production, the treatment of high-pressure production water in each oil field is generally to use cyclone equipment first, and then use gas flotation device after the pressure is reduced by a throttle valve. Two independent devices are used to combine the oil removal and recovery of oil products in the production water. The equipment volume is large, and a dissolved gas circulating pump is usually needed to supplement air, which increases the wear of the moving equipment and power consumption. There are also oil, gas and water three-phase connecting pipelines and valves between the two devices, which occupy a large space. The procurement cost, use and maintenance cost of the device are high. SUMMARY

[0004] The purpose of the present application is to solve the problems in the background art, and to provide a compact gas flotation cyclone device to reduce the volume of the equipment for treating high-pressure production water. The device can achieve initial separation by gas flotation, and then spray the gas and the initial separation liquid again by cyclone. In the process of cyclone, the gas, oil and water are separated again due to their different densities. The treatment effect is good, and no additional air supply equipment is needed. The structure is simple, and the cost of high-pressure production water treatment is reduced.

[0005] To achieve the above object, the present application provides the following technical solutions: a compact gas flotation cyclone device, comprising an upper tank body, an upper chamber is arranged in the upper tank body;

[0006] A lower tank body is arranged at the lower part of the upper tank body, and a lower chamber is arranged in the lower tank body;

[0007] A feed pipe is connected to the upper chamber;

[0008] An oil discharge port is arranged on the tank wall of the lower tank body;

[0009] A pipe assembly is arranged between the upper chamber and the lower chamber, comprising a plurality of pipelines penetrating from the inside of the upper chamber downward into the inside of the lower chamber, the part located in the upper chamber is a water guide pipe and a gas and liquid guide assembly, and the part located in the lower chamber is a plurality of jet pipes corresponding to the water guide pipe and the gas and liquid guide assembly respectively, and the nozzles of the jet pipes are inclined downward;

[0010] An air discharge pipe is connected to the top of the lower chamber, penetrating the upper chamber upward and extending to the outside of the upper tank body;

[0011] An oil collecting pipe is arranged in the lower chamber, one end of which is an oil collecting port located at the upper middle part of the lower chamber, and the other end is connected to the oil discharge port;

[0012] A water discharge port is arranged at the bottom of the lower chamber.

[0013] Preferably, the nozzles of the jet pipes of the pipe assembly are located on the same horizontal plane and are circumferentially distributed, the direction of the nozzles is towards the tangent direction of the circumference, and the direction of each nozzle is uniform.

[0014] Further preferably, the nozzles of the jet pipes are arranged in a ring shape symmetrically around the central axis of the lower tank body, and the distance between the nozzles of the jet pipes and the central axis of the lower tank body is greater than the distance between the nozzles and the inner wall of the adjacent side of the lower tank body.

[0015] Preferably, the gas and liquid guide assembly comprises a gas guide pipe and an oil guide pipe, the inlets of the gas guide pipe, the oil guide pipe and the water guide pipe are arranged in order from high to low, and the gas outlet of the gas guide pipe is located at one end of the inside of the oil guide pipe.

[0016] Further preferably, the height of the oil guide pipe is not uniform, and has two or more height specifications.

[0017] Preferably, a plurality of holes are distributed on the wall inside the upper chamber of the feed pipe.

[0018] Preferably, an oil skimming plate is arranged at the lower central position in the lower chamber, the oil skimming plate is located above the water discharge port, and a gap is left between the periphery of the oil skimming plate and the inner wall of the lower chamber.

[0019] Preferably, the oil collecting pipe is an L-shaped pipe, comprising a first pipe and a second pipe, the first pipe is arranged along the center line of the guide pipe assembly and is located above the skimming plate, one end of the first pipe is the oil collecting port, the other end is connected to the first end of the second pipe through a bent pipe, and the last end of the second pipe is connected to the oil discharging port.

[0020] Further preferably, the oil collecting port is located on the upper side of the jet pipe nozzle, and the upper part of the oil collecting port is provided with a plurality of oil collecting slits.

[0021] Preferably, the upper tank body and the lower tank body are an integral structure, the bottom wall of the upper tank body and the top wall of the lower tank body are coincident and serve as a chamber partition plate.

[0022] Compared with the prior art, the present application has the following beneficial effects:

[0023] The compact gas flotation cyclone device not only makes full use of the high pressure of production water but also can utilize dissolved gas multiple times, mainly in the following aspects:

[0024] First, the upper chamber and the lower chamber are independent of each other and do not interfere with each other, each has its own function, the flow process is clear, and the separation effect can be achieved when the gas flotation and cyclone devices independently function, and the lower chamber has few internal components, a large cyclone space and small resistance, and is very suitable for high-speed cyclone.

[0025] Second, under the same processing capacity and standard, the compact gas flotation cyclone device has a compact structure, the volume is greatly reduced compared with two independent devices, and no external moving device is needed, so the procurement and use cost is greatly reduced, and at the same time, due to the working principle and simple structure, the device has strong adaptability to shaking, and has great advantages for space-limited offshore platforms and other places, such as application on a floating production storage and offloading vessel (FPSO).

[0026] Third, the compact gas flotation cyclone device designed in the present application can fully recover fine oil droplets in oilfield production water, on the one hand, the production water reaches the environmental protection oil content standard, and on the other hand, the recovered oil has economic value, the whole device is compact, small in size and large in processing capacity, and has full adaptability to land and sea. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 Fig. 1 is a structural schematic diagram of the compact gas flotation cyclone device of the present application;

[0028] Figure 2 Fig. 2 is a structural schematic diagram of the local structure guide pipe assembly of the present application;

[0029] Figure 3Structure diagram of the air and liquid guide assembly and the jet pipe in the partial structure conduit assembly of the present application;

[0030] Figure 4 Structure diagram of the water guide pipe and the jet pipe in the partial structure conduit assembly of the present application;

[0031] Figure 5 Structure diagram of the partial structure feed pipe of the present application;

[0032] Figure 6 Structure diagram of Figure 1 Sectional view along the direction of A-A;

[0033] Figure 7 Structure diagram of the partial structure oil collecting pipe of the present application;

[0034] Figure 8 Flow direction diagram of the gas and liquid in the device when the present application is in use.

[0035] In the figure: 1, upper tank body; 11, upper chamber; 2, lower tank body; 21, lower chamber; 3, feed pipe; 31, hole; 4, conduit assembly; 41, water guide pipe; 42, air and liquid guide assembly; 421, air guide pipe; 422, oil guide pipe; 43, jet pipe; 5, exhaust pipe; 6, oil collecting pipe; 61, first pipe; 611, thick pipe; 612, thin pipe; 613, tapered pipe; 614, oil collecting seam; 62, second pipe; 7, water outlet; 8, skimming plate; 81, gap; 9, chamber partition; 10, oil outlet. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0037] It should be noted that in the description of the present application, the terms "upper", "lower", "top", "bottom", "inner", "outer", "first", "last" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0038] In addition, it should be understood that, for the convenience of description, the sizes of various components shown in the drawings are not drawn in accordance with the actual proportional relationship, for example, the thickness or width of certain layers can be exaggerated relative to other layers.

[0039] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined or described in one figure, it will not need to be discussed or described in detail in the description of the subsequent figures.

[0040] like Figure 1 As shown, the present invention provides a technical solution: a compact gas flotation cyclone device, comprising an upper tank 1 and a lower tank 2 arranged vertically. The interiors of both the upper tank 1 and the lower tank 2 are hollow cavities, corresponding to an upper chamber 11 and a lower chamber 21, respectively. The upper chamber 11 is connected to a feed pipe 3, and the lower tank 2 has an oil drain port 10 connected to its wall. A conduit assembly 4, comprising several pipes, is provided between the upper chamber 11 and the lower chamber 21, extending downwards from the interior of the upper chamber 11 into the interior of the lower chamber 21. The upper part of the conduit assembly 4, i.e., the portion located in the upper chamber 11, is configured according to… The components have different functions and are divided into a water guide pipe 41 and a gas and liquid guide assembly 42. The lower part of the guide assembly 4, which is located in the lower chamber 21, consists of several jet pipes 43, which correspond one-to-one with the water guide pipe 41 and the gas and liquid guide assembly 42. The nozzles of the jet pipes 43 are inclined downwards. The top of the lower chamber 21 is connected to an exhaust pipe 5, which extends upwards through the upper chamber 11 until it reaches the outside of the upper tank body 1. The lower chamber 21 is equipped with an oil collecting pipe 6, one end of which is an oil collecting port, and the other end is connected to an oil drain port 10. The oil collecting port is located in the upper middle part of the lower chamber 21, and the bottom of the lower chamber 21 is equipped with a drain port 7.

[0041] In this way, high-pressure production water flows into the upper chamber 11 from the inlet pipe and undergoes preliminary stratification under the action of gas flotation, forming a preliminary water layer, a preliminary oil layer, and a preliminary gas layer from bottom to top. Then, the fluids of each preliminary layer flow into several pipes of the conduit assembly 4 and are sprayed into the lower chamber through the jet pipe 43. The gas is mixed into the liquid again and undergoes gas flotation and coalescence again. Without the need for external gas replenishment, more thorough flotation stratification can be carried out. The stratified water is discharged outward through the drain port 7 at the bottom of the lower chamber 21, and the stratified oil is discharged outward through the oil collection pipe 6. The gas generated after flotation in the lower chamber 21 is discharged outward through the exhaust pipe 5 at the top of the lower chamber 21.

[0042] Figures 2-4 The diagram shows the structure of the conduit assembly 4 of the present invention. The nozzles of the jet tube 43 of the conduit assembly 4 are located on the same horizontal plane and are distributed in a circle. The nozzles are oriented towards the tangent of the circle, and the orientation of each nozzle is uniformly clockwise or uniformly counterclockwise. In this way, a strong swirling flow can be generated. The swirling flow causes the oil droplets and water after flotation and coalescence to separate into layers more quickly. In the lower chamber 21, the water is located in the lower layer, the oil is located in the upper layer of the water, and the gas is located above the water and oil.

[0043] Furthermore, the nozzle of the jet pipe 43 is arranged in a ring-shaped symmetrical manner around the central axis of the lower tank 2. Preferably, the distance between the nozzle of the jet pipe 43 and the central axis of the lower tank 2 is greater than the distance between the nozzle and the inner wall of the adjacent side of the lower tank 2, which can maximize the swirl energy.

[0044] like Figure 3 As shown, the inlets of the water pipe 41, oil pipe 422, and air pipe 421 are set at different heights: the oil inlet of the oil pipe 422 is lower than the air inlet of the air pipe 421 but higher than the water inlet of the water pipe 41. That is, the water inlet of the water pipe 41 is set at the lowest point, close to the bottom wall of the upper cavity, the air inlet of the air pipe 421 is set at the highest point, close to the top wall of the upper cavity, and the oil inlet of the oil pipe 422 is in the middle, between the water inlet and the air inlet. In this way, the initial water layer in the upper cavity 11 flows into the jet pipe 43 through the water pipe 41 and is ejected, while the initial oil layer flows into the jet pipe 43 through the oil pipe 422, and the initial gas flows into the oil pipe 422 through the air pipe 421. After mixing with the initial oil layer in the oil pipe 422, they are ejected together through the jet pipe 43.

[0045] Furthermore, the gas-guiding and liquid-guiding assembly 42 includes a gas-guiding pipe 421 and an oil-guiding pipe 422. One end of the gas-guiding pipe 421 is inserted into the oil-guiding pipe 422 from the oil-guiding pipe 422. That is, the gas-guiding pipe 421 is located inside the oil-guiding pipe 422. This arrangement allows the gas in the upper chamber to flow into the oil-guiding pipe 422 through the gas-guiding pipe 421. After the gas and liquid mix in the jet pipe 43, they are ejected into the lower chamber 21. Due to the action of the jet pipe 43, a strong swirling flow is generated. At the same time, the gas introduced into the upper chamber 11 generates large bubbles. Some of the gas dissolved in the liquid that has not been precipitated is further precipitated to generate fine bubbles. Under the combined action, gas flotation and coalescence are further carried out. Meanwhile, after the gas and liquid are ejected through the jet pipe 43, a swirling flow in the same direction is generated. The gas flotation and swirling flow complement each other and will not become a resistance to the swirling flow.

[0046] Furthermore, the heights of the several oil guide pipes 422 are different, with two or more height specifications, which can adjust and adapt to fluctuations in the liquid inlet. Specifically, when the liquid flow rate in the feed pipe 3 is small, and the liquid level in the upper cavity is lower than the oil inlet of the higher oil guide pipe 422, at this time, part of the gas in the upper cavity enters the gas guide pipe 421 and then enters the jet pipe 43, while the other part flows into the jet pipe 43 through the oil inlet of the higher oil guide pipe 422 and is then ejected from the jet pipe 43. In other words, some gas is directly injected into the lower chamber 21. At this time, the gas generates large bubbles in the lower chamber 21, achieving auxiliary separation.

[0047] like Figure 5As shown, the feed pipe 3 extends from outside the upper chamber 11 to inside the upper chamber 11, and a plurality of holes 31 are distributed on the pipe wall of the feed pipe 3 extending into the upper chamber 11. Furthermore, the feed pipe 3 is a sealed pipe, that is, the end of the feed pipe 3 extending into the upper chamber 11 is sealed, and preferably, the sealed end surface is also provided with holes 31. The feed pipe 3 is thus arranged to more evenly distribute the fluid, so that the fluid entering the device is evenly distributed, resulting in a large amount of bubbles and uniform position, greatly improving the separation effect.

[0048] As shown in Figure 1 and Figure 6 , an oil skimming plate 8 is arranged at the lower center of the lower chamber 21, located above the drain 7, and a gap 81 is left between the periphery of the oil skimming plate 8 and the inner wall of the lower chamber 21, allowing water at the outer edge of the bottom layer of the lower chamber 21 to flow through the gap 81 between the oil skimming plate 8 and the inner wall of the lower chamber 21 to the drain 7 of the device.

[0049] As shown in Figure 7 , the oil collecting pipe 6 is an L-shaped pipe, including a first pipe 61 and a second pipe 62. One end of the first pipe 61 is an oil collecting port, and the other end of the second pipe 62 is connected to the oil outlet 10. The first pipe 61 extends downward along the center line of the guide pipe assembly 4 above the oil skimming plate 8, and then bends to extend downward from the second pipe 62 to the outside of the tank 2, and the oil is discharged from the oil outlet 10. In this way, the influence of the oil collecting pipe 6 on the cyclone effect can be reduced. Preferably, the first pipe 61 is a structure of a thick upper pipe 611 and a thin lower pipe 612, and a tapered pipe 613 is arranged at the joint between the thick and thin pipes.

[0050] Furthermore, the oil collecting port of the oil collecting pipe 6 is located above the nozzle of the jet pipe 43, and a plurality of oil collecting seams 614 are arranged on the upper part of the oil collecting port. Compared with a straight pipe, the oil collecting port has the effect of skimming oil and buffering when the liquid is disturbed and the working condition fluctuates, so that the oil collecting effect is good, and the process has good adaptability to working condition fluctuations.

[0051] Further, the upper tank 1 and the lower tank 2 are an integral structure, and the bottom wall of the upper tank 1 and the top wall of the lower tank 2 coincide to form a chamber partition 9.

[0052] Further, valves are arranged on the feed pipe 3, the oil outlet 10, and the drain 7 to control the inflow or outflow of various liquids.

[0053] In this embodiment, as shown in Figure 3 , the oil guide pipe 422 of the gas and liquid guide assembly 42 is an integral structure with the corresponding jet pipe 43; as shown in Figure 4 , the water guide pipe 41 is an integral structure with the corresponding jet pipe 43.

[0054] In the embodiment, to avoid the conflict of the feed pipe 3 and the exhaust pipe 5 in space, the position of the exhaust pipe 5 is set at a non-central position of the chamber partition 9, and the structure of the feed pipe 3 can also be bent to avoid the space where the exhaust pipe 5 is located. Of course, in actual implementation, the spatial position relationship of the several pipes in the pipe assembly 4 and the feed pipe 3 also needs to be considered to avoid the conflict in space.

[0055] In the embodiment, the chamber partition 9 is in a planar shape, the central axes of the water guide pipe 41 and the gas and liquid guide assembly 42 are perpendicular to the chamber partition 9, and the central axis of the jet pipe 43 is at an angle of 45° with the chamber partition 9.

[0056] In the embodiment, the oil skimming plate 8 is made of a circular thin stainless steel plate, the thickness is 6 mm, a gap 81 of 100 mm is left between the outer diameter and the inner wall of the lower chamber 21, and the oil skimming plate 8 is installed at the bottom of the lower chamber 21, which has a good oil skimming effect.

[0057] In the embodiment, the height of the water guide pipe 41 is 100 mm, the height of the gas guide pipe 421 is 550 mm, and the height h of the oil guide pipe 422 is designed to be different according to the liquid inflow amount, which has an adjusting and adapting function for the liquid inflow amount fluctuation.

[0058] In the embodiment, the feed pipe 3 is made of a stainless steel pipe with one end blocked, and a proper amount of Φ6 mm round holes are processed on the cylindrical pipe wall, which has the functions of preventing fluid impact and uniformly distributing the fluid into the pipe.

[0059] Figure 8 The gas and liquid flow direction in the device during use of the application is shown. In use, the high-pressure production water flows into the upper chamber 11 from the liquid inlet pipe, is preliminarily stratified, and then is sprayed into the lower chamber 21 through the pipe assembly 4 to generate strong cyclone again for flotation and stratification, and the pressure of the high-pressure production water > the pressure of the upper chamber 11 > the pressure of the lower chamber 21.

[0060] In the embodiment, the pressure of the upper chamber 11 is about 0.8 Mpa, which is very low relative to the high-pressure production water 6-10 MPa. In the process of sudden pressure reduction, the dissolved gas in the water will be precipitated rapidly to generate a large number of fine bubbles. In the process of bubble floating, the oil droplets in the water are in contact with the bubbles. Since the surface tension and viscosity of the oil droplets are much larger than those of the water, the adhesion between the oil droplets and the bubbles is much larger than that of the water. Therefore, the oil droplets are attached to the bubbles and are taken to the top layer of the liquid. In the gas flotation, the fine oil droplets in the liquid are coalesced into larger oil droplets, and the oil and water appear to be preliminarily stratified. After the gas reaches the top of the liquid surface, the oil droplets break, the gas overflows to the upper space of the upper chamber, and the liquid presents the initial water layer, the initial oil layer and the initial gas layer.

[0061] The pressure of the lower chamber 21 is about 0.05 MPa lower than that of the upper chamber 11, and this pressure difference is generated by the shorter nozzle. In practical applications, the pressure difference between the upper and lower chambers 21 can be further increased by designing the number and caliber of the nozzles. A high pressure difference can generate a high flow rate through the nozzle, and an impact in the lower chamber 21 generates a strong spiral flow of gas and liquid in the same direction. The spiral flow effect makes the larger oil droplets after flotation and coalescence separate from water quickly. The oil has a small density and is gathered to the center under the action of centrifugal force, while water has a large density and is gathered to the outer edge of the spiral flow. The action of gravity makes the water in the lower chamber 21 purer as it goes down in the vertical direction, and the oil purer as it goes up. The water at the bottom and outer edge of the lower chamber 21 flows to the drainage port 7 of the device through the gap 81 between the skimming plate 8 and the inner wall of the lower tank 2, and the oil at the top and center is collected through the oil collection pipe 6 and then flows out of the device. The upper part of the liquid is a small amount of gas space, which collects and contains the gas in the lower chamber 21. The gas is discharged from the device through the exhaust pipe 5.

[0062] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A compact gas flotation cyclone device, characterized in that, include: The upper tank body (1) has an upper chamber (11) inside; The lower tank (2) is located below the upper tank (1) and has a lower chamber (21) inside; Feed pipe (3) is connected to the upper chamber (11); An oil drain port (10) is connected to the tank wall of the lower tank body (2); The conduit assembly (4) is disposed between the upper chamber (11) and the lower chamber (21), and includes several pipes that extend downward from the interior of the upper chamber (11) into the interior of the lower chamber (21). The portion located in the upper chamber (11) consists of a water guide pipe (41) and a gas guide liquid guide assembly (42), and the portion located in the lower chamber (21) consists of several jet pipes (43) that correspond one-to-one with the water guide pipe (41) and the gas guide liquid guide assembly (42). The nozzles of the jet pipes (43) are inclined downward. An exhaust pipe (5) is connected to the top of the lower chamber (21), extends upward through the upper chamber (11) and to the outside of the upper tank (1); An oil collecting pipe (6) is provided in the lower chamber (21), with one end being an oil collecting port located in the upper middle part of the lower chamber (21) and the other end connected to the oil drain port (10); A drain outlet (7) is located at the bottom of the lower chamber (21); The nozzles of the jet tube (43) of the conduit assembly (4) are located on the same horizontal plane and are distributed in a circle. The nozzles are oriented towards the tangent of the circle and the orientation of each nozzle is uniform. The nozzle of the jet pipe (43) is arranged in a ring symmetrical manner around the central axis of the lower tank (2), and the distance between the nozzle of the jet pipe (43) and the central axis of the lower tank (2) is greater than the distance between the nozzle and the inner wall of the lower tank (2) on the adjacent side. The gas-guiding and liquid-guiding assembly (42) includes a gas-guiding pipe (421) and an oil-guiding pipe (422). The inlets of the gas-guiding pipe (421), the oil-guiding pipe (422), and the water-guiding pipe (41) are arranged from high to low in sequence. One end of the gas outlet of the gas-guiding pipe (421) is located inside the oil-guiding pipe (422). The oil guide pipe (422) has different heights and has two or more height specifications; An oil skimming plate (8) is provided at the lower center of the lower chamber (21). The oil skimming plate (8) is located above the drain outlet (7), and there is a gap (81) between it and the inner wall of the lower chamber (21). The oil collecting pipe (6) is an L-shaped pipe, including a first pipe (61) and a second pipe (62). The first pipe (61) is arranged along the center line of the conduit assembly (4) and located above the skimming plate (8). One end of the first pipe (61) is the oil collecting port, and the other end is connected to the beginning of the second pipe (62) through a bent pipe. The end of the second pipe (62) is connected to the oil drain port (10).

2. The compact gas flotation cyclone apparatus according to claim 1, characterized in that: The feed pipe (3) is located inside the upper chamber (11) and has several holes (31) distributed on its wall.

3. The compact gas flotation cyclone apparatus according to claim 1, characterized in that: The oil collection port is located above the nozzle of the jet pipe (43), and the upper part of the oil collection port is provided with multiple oil collection slots (614).

4. The compact gas flotation cyclone apparatus according to claim 1, characterized in that: The upper tank (1) and the lower tank (2) are an integral structure. The bottom wall of the upper tank (1) and the top wall of the lower tank (2) overlap and form a chamber partition (9).

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