CN201157703Y - Compact cyclone air flotation separation equipment for oily wastewater treatment - Google Patents

Abstract

A compact cyclone air flotation separation device for oily wastewater treatment, mainly composed of a cyclone air flotation combination tank (1), a circulating gas assembly (2), a gas-liquid mixing assembly (3) and a circulating return water assembly (4), wherein , the swirling flow air flotation combination tank (1) is a key component, and it is made up of cylindrical outer shell (11), elliptic upper head (12) and elliptic lower head (13), wherein mainly is provided with inner cylinder ( 14), the inlet guide (31), and connected with the tangential inlet pipe (34), the bottom is provided with the gas circulation pipeline in the cylinder (23), the return water pipeline in the cylinder (42), and the air flotation injector (43) , air floatation baffle (432) and horizontal disc (133). The cylindrical outer cylinder body (11) is connected with the circulating gas assembly (2), the gas-liquid mixing assembly (3) and the circulating return water assembly (4) to form the overall body of the utility model. The utility model has the advantages of compact and simple structure, high working efficiency, small land occupation, low cost, easy operation, maintenance and repair, and is especially suitable for purification treatment of oily waste water containing tiny dispersed oil droplets.

Description

Compact cyclone air flotation separation equipment for oily wastewater treatment

technical field

The utility model relates to equipment for multi-phase separation and treatment of oil, gas and water in oily wastewater, in particular to purification, treatment and separation equipment for oily wastewater containing tiny dispersed oil droplets.

Background technique

Oily wastewater is often encountered in the production of petroleum and petrochemical industries and urban life, and the implementation of oil-water separation to remove the oil is often the primary treatment task. There are many methods for oil-water separation, and the commonly used treatment methods include gravity sedimentation, centrifugal sedimentation, air flotation, filtration, adsorption, membrane separation, etc.

Each treatment method has its own advantages and disadvantages and specific scope of application. The air flotation method has mature technology, low cost, and large treatment capacity. It has been widely used in the treatment of wastewater in oil fields, petrochemicals, and food oil production. Its main disadvantages are that the slick oil is difficult to handle, and the flotation residence time is long; when the processing capacity is large, large-scale air flotation equipment must be built, which occupies a large area and has high investment costs. The hydrocyclone-based cyclone separation technology has been more and more widely used in the treatment of oily wastewater since the 1990s. The oil and water are separated by the centrifugal force generated by the cyclone by using the density difference between the oil and water phases. , has the advantages of compact structure, small footprint, and simple operation and maintenance, but the size range of oil droplets that can be removed by this method is not less than 20 μm.

In order to overcome the shortcomings of traditional air flotation and cyclone and further enhance the oil-water separation effect of air flotation, many researchers and even related water treatment equipment manufacturers have proposed the combination of air flotation separation technology and cyclone separation technology in recent years. From this viewpoint, some substantive research results have been obtained.

At present, the combination technology of cyclone and air flotation in China is only limited to the combination of air flotation separation technology and liquid-liquid separation hydrocyclone monomer for oil-water separation, which is in the stage of laboratory exploration. Due to the very limited processing capacity of the hydrocyclone unit, it is very troublesome when multiple units need to be connected in parallel and gas is injected at an appropriate position, thus restricting its industrial application.

In recent years, foreign countries have introduced several combined technologies of air flotation and low-intensity cyclone centrifugal force field. This technology not only overcomes the shortcomings of low processing capacity in domestic research, but also has achieved certain results in the treatment and application of oily wastewater in the petroleum industry. Therefore, in the future, the combination technology of air flotation and low-intensity cyclone centrifugal force field will dominate the development direction of air flotation and cyclone combined treatment technology.

In the US patent US7144503 applied by Norway M-I Epcon Company, a degassing flotation combination tank is described. There is a cylindrical inner cylinder and a spiral inlet guide in the tank, and the oily waste water enters the tank from the tangential inlet on the upper part of the tank. A swirl is formed while air bubbles are released from the water. Bubbles and oil droplets are pressed to the inner cylinder wall under the action of the swirling flow, and the two are combined and adhered to rise to the top of the tank, and are discharged through the oil and gas outlet on the top of the tank. According to the report of the patentee, this device has a good treatment effect on oily wastewater, and the cost and maintenance costs are very low. It is more suitable for offshore oil production platforms or floating production, storage and offloading (FPSO) and other space requirements. field use. But from the structural diagram attached to this patent, there are some problems in the efflux of the oil and air bubble scum rising to the top of the tank. Especially the offshore oil production platform or FPSO will be in a sloshing state due to the action of waves, waves, and currents. At this time, the liquid level inside the tank is difficult to maintain stable, resulting in excessive water content in the oil discharged from the device and the air bubble scum. High, which seriously affects the separation effect.

In the U.S. patent US7157007 applied by Natco Group in the United States, a three-phase separation device for oil, gas and water is described. The device is a vertical air flotation separation tank, which is mainly divided into upper, middle and lower layers. Flow separation, coarse granulation and air flotation separation technology. An inner cylinder is installed in the middle of the upper part of the tank. The oily waste water enters the inner cylinder from the tangential inlet to generate swirling flow, and the oil and water are separated in the inner cylinder, and the oil phase directly enters the oil skimmer. When the water flowing from the bottom of the inner cylinder passes through the coalescing layer in the middle of the tank, the dispersed oil droplets gather and grow. Under the action of buoyancy, some large-particle oil droplets will overcome their own gravity and the downward flow of the main phase and start to float upward, thereby removing part of the oil. An ejector is installed at the lower part of the tank, and the gas at the top of the tank and the reflux purified water are sheared and mixed in the ejector to generate tiny bubbles to perform air flotation treatment on the oily wastewater flowing down from the coalescing layer. However, the regular cleaning of the coalescing layer is very troublesome, and the internal structure of the whole set of equipment is very complicated, and the cost of processing and manufacturing is relatively high.

In view of the above reasons, it is necessary to further develop a new type of compact air flotation cyclone separation system to overcome the shortcomings of the above-mentioned oil-water separation device.

Contents of the invention

According to the background technology, the purpose of this utility model is to avoid the above-mentioned shortcomings, and to provide a unit technology that combines the two oil-water separation units of swirl flow and air flotation, so that the dispersed oil droplets in the water can be separated efficiently, and the purpose of purification treatment can be achieved. Compact cyclone air flotation separation equipment for oily wastewater treatment.

In order to achieve the above object, the utility model is achieved through the following technical solutions:

A compact cyclone air flotation separation device for oily wastewater treatment, mainly composed of a cyclone air flotation combination tank (1), a circulating gas assembly (2), a gas-liquid mixing assembly (3) and a circulating return water assembly (4), wherein : the tank body of the swirling air flotation combined tank (1) is made up of a cylindrical outer cylinder (11), an elliptical upper head (12) and an elliptical lower head (13), wherein on the upper head (12) A circulating gas outlet (21), an oil outlet flange (121) and a gas safety valve (126) are installed, and the oil outlet flange (121) is connected with the inner suspension pipe (123) in the inner cylinder (14), and its The tail of the inner suspension pipe (123) is provided with a fixed piece (124) and an oil outlet groove (125), and the bottom of the outer cylinder (11) is equipped with a circulating backflow water inlet (41), which is connected to the backflow water pipeline in the cylinder (42 ) connection, the end of the return water pipeline (42) in the cylinder is connected with the air flotation injector (43), the upper middle part of the air flotation injector (43) is provided with an injector air inlet (431), and the lower part is provided with a round Disc-shaped air flotation baffle (432), the distance from the lower end surface (5～10) mm of the air flotation injector (43), in the lower head (13) of the outer cylinder (11), the lower head water outlet (131 ) is provided with a horizontal circular plate (133), and a circular water flow channel (134) is formed between the lower head (13), and a filter screen (135) is arranged around the horizontal circular plate (133). Oil sludge outlet (132) is also installed on the head (13);

Inner cylinder (14) is made up of spherical crown oil skimming groove (141) and cylindrical oil cylinder (142), and the upper end of its spherical crown oil skimming groove (141) is made into sawtooth overflow weir (143), and the inner cylinder (14) The bottom is fixedly connected with the inner suspension pipe (123), the distance H ₁ =50mm between the upper edge of the cylindrical outer body (11) and the upper edge of the spherical crown oil skimming groove (141), and the inner cylinder (14) bottom edge is apart from the outer edge. The upper edge distance H ₂ of the cylinder (11) = (1/3～3/5)H;

The circulation gas pipeline (24) is connected with the circulation gas outlet (21), the circulation gas inlet (22), the air circulation pipeline (23) in the cylinder, and the gas circulation pipeline (23) in the cylinder is connected with the air flotation ejector (43 ) of the air inlet (431) are connected together to form a circulating gas assembly (2);

On the upper part of the outer cylinder (11), an inlet guide (31) is fixed around the inner cylinder (14) and fixed on the inner wall of the outer cylinder (11), and the starting end (32) of the guide and the tangential inlet pipe (34) The end of the inlet pipe is connected smoothly, the inlet guide vane (31) is helically arranged along the circumferential direction of the cylinder wall, the helix angle is 5°-15°, and the intersection line of the inlet guide vane (31) and the inner wall of the outer cylinder body (11) is at The circumferential angle projected on the horizontal plane is 210°～330°, and there should be a certain radial gap between the inlet guide vane (31) and the outer surface of the inner cylinder (14), tangential to the inlet (37) of the inlet pipe (34). ) is connected with the gas-liquid mixing pump (36) through the pipeline (35), so that the inlet guide (31), the tangential inlet pipe (34), the pipeline (35) and the gas-liquid mixing pump (36) together form a gas-liquid mixing component(3);

The inlet and outlet pipes (44) are formed by connecting the water inlet pipe (441), the tee pipe (442) and the drain pipe (443), and the water inlet (444) of the inlet and outlet pipe (44) is connected with the outlet of the lower head (131 ), the circulating backflow water pump (45) is connected to the circulating backflow water inlet (41) through the backflow water pipeline (46) outside the cylinder, the air flotation injector (43), the disc-shaped air flotation baffle (432), the backflow inside the cylinder The water pipeline (42), the recirculation water inlet (41), the external recirculation water pipeline (46), the recirculation water pump (45) and the inlet and outlet pipes (44) together form the recirculation water assembly (4).

Due to the adoption of the above-mentioned technical scheme, the utility model has the following advantages and effects:

1. The present invention successfully realizes the organic combination of two oil-water separation unit technologies of cyclone and air flotation, can separate tiny oil droplets, and greatly improves work efficiency. Purification treatment of oily wastewater from oil droplets.

2. The present invention has strong adaptability to the fluctuation of the processing flow rate and its oil and gas content, and has greater operational flexibility.

3. The structure of the present invention is cheap and easy to use, install, maintain and repair.

Description of drawings

Fig. 1 is the overall sectional schematic diagram of structure of the present invention

Fig. 2 is the A-A sectional schematic diagram of Fig. 1 of the present invention

Fig. 3 is the B-B sectional schematic diagram of Fig. 1 of the present invention

Fig. 4 is the C-C sectional schematic diagram of Fig. 1 of the present invention

Fig. 5 is a schematic sectional view of the air flotation injector of the present invention

Figure 6 is a schematic cross-sectional view of the overall structure of another embodiment of the present invention

Fig. 7 is a schematic diagram of the structure of the series connection mode of the cyclone air flotation combined tank of the present invention

Figure 8 is a schematic diagram of the structure of the parallel connection mode of the cyclone air flotation combined tank of the present invention

Detailed ways

Figures 1 to 4 show a compact cyclone air flotation separation device for oily wastewater treatment according to the present invention, which mainly consists of a cyclone air flotation combined tank 1, a circulating gas assembly 2, a gas-liquid mixing assembly 3 and a circulating return water assembly 4 Composition, wherein: the tank body of the swirling flow air flotation combined tank 1 is composed of a cylindrical outer cylinder 11, an oval upper head 12 and an oval lower head 13, wherein the upper head 12 is equipped with a circulating gas outlet 21, The oil outlet flange 121 and the gas safety valve 126, the oil outlet flange 121 is connected with the inner suspension pipe 123 in the inner cylinder 14, the tail of the inner suspension pipe 123 is provided with a fixed piece 124 and an oil outlet groove 125, the outer cylinder The bottom of 11 is equipped with a circulating backflow water inlet 41, and is connected with the backflow water pipeline 42 in the cylinder. The air inlet 431 of the device is provided with a disc-shaped air flotation baffle 432 below, and the distance from the lower end of the air flotation injector 43 is 5-10 mm. The horizontal circular plate 133 forms a ring-shaped water flow channel 134 with the lower head 13, a filter screen 135 is arranged around the horizontal circular plate 133, and a sludge outlet 132 is also installed on the lower head 13;

The inner cylinder 14 is composed of a spherical crown oil skimming groove 141 and a cylindrical oil cylinder 142. The upper end of the spherical crown oil skimming groove 141 is made into a sawtooth overflow weir 143. The bottom of the inner cylinder 14 is fixedly connected with the inner suspension pipe 123. The distance H 1 between the upper edge of the cylinder 11 and the upper edge of the spherical crown oil skimming groove 141 = 50mm _{, the distance H 2 from} the bottom edge of the inner cylinder 14 to the upper edge of the outer cylinder 11 = (1/3～3/5)H ;

The circulation gas pipeline 24 is connected with the circulation gas outlet 21, the circulation gas inlet 22, and the gas circulation pipeline 23 in the cylinder, and the gas circulation pipeline 23 in the cylinder is connected with the air inlet 431 of the air flotation injector 43 to form a circulation gas assembly 2;

On the upper part of the outer cylinder 11, an inlet guide piece 31 is arranged to surround the inner cylinder 14 and be fixed on the inner wall of the outer cylinder 11. The starting end 32 of the guide piece is connected with the end of the inlet pipe tangential to the inlet pipe 34 in a smooth transition, and the inlet guide piece 31 Helically arranged along the circumferential direction of the cylinder wall, the helix angle is 5°-15°, the circumferential angle projected on the horizontal plane by the intersection line between the inlet guide piece 31 and the inner wall of the outer cylinder body 11 is 210°-330°, the inlet guide piece 31 and the A certain radial gap should be left between the outer surfaces of the inner cylinder 14, and the inlet 37 of the tangential inlet pipe 34 is connected with the gas-liquid mixing pump 36 through a pipeline 35, so that the inlet guide 31, the tangential inlet pipe 34, and the pipe The road 35 and the gas-liquid mixing pump 36 together form the gas-liquid mixing assembly 3;

The water inlet pipe 441, the three-way pipe 442 and the water outlet pipe 443 are connected to form the water inlet pipe 44, and the water inlet 444 of the water inlet pipe 44 is connected to the water outlet 131 of the lower head, and the circulating return water pump 45 passes through the return water pipe 46 outside the cylinder Connected with the circulating backflow water inlet 41, the air flotation injector 43, the disc-shaped air flotation baffle 432, the inner backflow water pipeline 42, the backflow water inlet 41, the outer backflow water pipeline 46, the backflow water pump 45 and the water inlet and outlet The pipes 44 together constitute the circulating return water assembly 4 .

It is also known that the centrifugal strength of the cyclone generated by the gas-liquid mixture in the combined cyclone-air flotation tank 1 also has a great influence on the separation performance, and the ideal centrifugal strength ranges from 15 to 30.

The gas content in the cyclone air flotation combination tank 1 should also be kept in an appropriate range, and the ideal gas-liquid ratio is 9% to 18%.

It is generally required that the diameter of the air bubbles generated by the air flotation ejector 43 range from 100 μm to 300 μm.

It is also known that at first, the gas-liquid mixing pump 36 is used to pump water and inhale air, and the oily wastewater and gas are vigorously stirred in the pump, and sheared and mixed into a uniform mixture of oily wastewater-microbubbles, which increases the chance of dispersing oil droplets and microbubbles. Adhesion opportunities, then enter the outer cylinder 11 through the tangential inlet pipe 34, and form a spiral upward swirl flow in the tank through the inlet guide 31.

The gas-liquid mixed fluid rotates in the tank to generate centrifugal force, and the denser water phase moves toward the inner wall of the tank, while light components such as oil droplets and tiny bubbles adhered to the oil droplets undergo radial relative migration to the middle of the tank and reach the tank. The area near the outer wall of the inner cylinder 14. In this process, due to the difference in the radial migration speed of dispersed oil droplets and micro-bubbles, the radial migration speed of micro-bubbles is relatively large, which increases the chance of contact between the two and improves the viscosity of micro-bubbles and micro-oil droplets. Attach speed. Since the density of the air bubble-oil droplet adherents is far lower than that of water, the air bubble-oil droplet adherents that have been located near the outer wall of the inner cylinder 14 in the tank slowly float up. However, most of the gas-liquid mixed fluid will rotate and flow downward, and at the same time, the centrifugal effect of the rotation will gradually weaken. In the process, there will still be some bubbles-oil droplet adherents slowly floating up. In order to further enhance the air flotation separation effect, through the air flotation injector 43 installed at the center of the lower part of the tank, the circulating return water pump 45 circulates a part of the purified water back to the middle and upper part of the air flotation injector. The gas is inhaled from the top, and the gas is sheared and broken into tiny bubbles in the air flotation injector 43. Under the cooperation of the disc-shaped air flotation baffle 432, the purified water containing bubbles at the outlet of the air flotation injector 43 is evenly distributed in the air. The surrounding area of the flotation ejector 43 forms a complete air flotation enhanced separation zone. The tiny oil droplets remaining in the wastewater in the lower part of the tank adhere to the air bubbles to form bubble-oil droplet adherents again and float to the top of the tank. After two air flotation processes before and after, a layer of oil-water emulsion and air bubble scum will be produced on the top of the liquid surface in the tank. The port flange 121 is continuously drained out of the tank. Part of the gas phase in the tank is mixed in the bubble scum, and is discharged out of the tank from the oil outlet flange 121 together with the oil-water emulsion, and part of it rises to the top of the tank, and the part of the gas that rises to the top of the tank is divided into two discharge methods , a part is discharged from the gas safety valve 126, and the other part is sucked in from the circulating gas outlet 21, and enters the tank again to be recycled as a gas source. The treated water flows along the tank wall to the bottom of the tank, flows slowly through the horizontal circular plate 133, and is discharged from the water outlet 131 at the bottom of the tank. In addition, sand and other heavier particles will fall to the bottom of the tank, be collected by the screen 135 and be discharged in the form of sludge through the sludge outlet 132 at the bottom of the tank.

Shown in Fig. 5 is the schematic cross-sectional view of the air flotation injector of the present invention, it can be seen from the figure that the air flotation injector 43 is actually a Venturi nozzle, mainly composed of a cylinder section 433, an air suction port 434, a constriction section 435, and an air suction cavity 436, a throat 437 and a diffuser section 438, wherein the top of the air flotation injector 43 is connected to the pipeline 42 in the cylinder through the flange, and the treated purified water is introduced from the water outlet 131 of the lower head through the circulating return water pump 45, The suction port 434 is connected to the gas circulation pipeline 23 in the cylinder so as to suck gas from the circulation gas outlet 21 .

Another embodiment of the present invention is shown in Fig. 6, mainly because the installation positions of the injectors of the circulating backflow water assembly 4 are different. The two ejectors 43 arranged laterally on the lower part of the body 11 are connected to the circulation return water pump 45 through the return flow pipe 46 outside the cylinder, and inject the water flow containing tiny bubbles tangentially into the tank, wherein the gas is circulated by the circulation gas of the outer cylinder body 11 The outlet 21 enters the suction chamber 436 from the air inlet 47 along the circulating gas pipeline 24 and is sheared into tiny bubbles. The suction chamber 436 is a vacuum and low-pressure area, and the gas-liquid mixture entering tangentially spirals in the tank. Rotating, combined swirling and air flotation treatment for oily wastewater.

The compact swirling air flotation combined tank 1 of the utility model can be connected in series or in parallel according to different performance requirements such as working flow.

Figure 7 shows the working method of three compact cyclone air flotation combination tanks in series, the water outlet of the previous combination tank is used as the water inlet of the next combination tank, and the oil discharged from the oil outlet is collected into the same pipeline. The method can improve the separation efficiency of the compact cyclone air flotation combination tank.

Figure 8 shows the working mode of two compact cyclone-air flotation combination tanks connected in parallel. The two independently purify the oily wastewater, and the oil discharged from the oil outlet and the water discharged from the water outlet are respectively collected in the same pipeline. This working method can improve the processing capacity of the compact cyclone air flotation combination tank.

To sum up, the gas-liquid mixture of oily wastewater enters the tank from the tangential inlet on the upper part of the tank, forming a swirl flow in the tank. At the same time, under the action of the gas-liquid mixing pump, the air bubbles evenly distributed in the oily wastewater are precipitated in the tank, and the oily wastewater in the tank is subjected to air flotation treatment. Therefore, lighter substances such as air bubbles adhered to oil droplets move to the top of the tank; heavier substances such as water flow and solid phase particles move to the bottom of the tank, and when they reach the sprayed air flotation area at the lower part of the combined tank, the oily wastewater is treated by the injector. Secondary air flotation treatment. Therefore, the oily wastewater is equivalent to one cyclone separation and two air flotation separations in the tank, which can achieve a satisfactory treatment effect.

Claims (4)

1. A compact cyclone air flotation separation device for oily wastewater treatment, mainly composed of a cyclone air flotation combination tank (1), a circulating gas assembly (2), a gas-liquid mixing assembly (3) and a circulating return water assembly (4) , is characterized in that: the tank body of swirl air flotation combined tank (1) is composed of cylindrical outer cylinder body (11), elliptical upper head (12) and elliptic lower head (13), wherein the upper head (12) is equipped with circulating gas outlet (21), oil outlet flange (121) and gas safety valve (126), oil outlet flange (121) and inner suspension pipe (123) in the inner cylinder (14) ) connection, the tail of the inner suspension pipe (123) is provided with a fixed plate (124) and an oil outlet groove (125), and the bottom of the outer cylinder (11) is equipped with a circulating return water inlet (41), which is connected to the inner cylinder. The water pipeline (42) is connected, and the end of the backflow water pipeline (42) in the cylinder is connected with the air flotation injector (43), and the middle and upper part of the air flotation injector (43) is provided with an injector air inlet (431), A disc-shaped air flotation baffle (432) is arranged below, (5-10) mm away from the lower end surface of the air flotation injector (43), inside the lower head (13) of the outer cylinder (11), the lower head exits A horizontal circular plate (133) is arranged above the nozzle (131), and an annular water flow channel (134) is formed between the lower head (13), and a filter screen (135) is arranged around the horizontal circular plate (133). ), an oil sludge outlet (132) is also installed on the lower head (13); the inner cylinder (14) is made up of a spherical crown oil skimming groove (141) and a cylindrical oil cylinder (142), and the spherical crown oil skimming groove (141) The upper end is made into a sawtooth overflow weir (143), the bottom of the inner cylinder (14) is fixedly connected to the inner suspension pipe (123), and the upper edge of the cylindrical outer cylinder (11) is connected to the upper edge of the spherical crown oil skimming groove (141). The distance between H ₁ =50mm, the distance from the bottom edge of the inner cylinder (14) to the upper edge of the outer cylinder (11) H ₂ =(1/2-2/3)H; the gas circulation pipeline (24) and the circulation The gas outlet (21), the circulating gas inlet (22), and the gas circulation pipeline (23) in the cylinder are connected, and the gas circulation pipeline (23) in the cylinder is connected with the air inlet (431) of the air flotation ejector (43) Together constitute the circulating gas assembly (2); on the upper part of the outer cylinder (11), an inlet guide (31) is arranged around the inner cylinder (14) and fixed on the inner wall of the outer cylinder (11), and the starting end of the guide (32 ) is smoothly and excessively connected with the inlet pipe end of the tangential inlet pipe (34), the inlet guide vane (31) is arranged spirally along the circumferential direction of the cylinder wall, and the inlet guide vane (31) is arranged spirally and annularly along the cylinder wall circumferential direction, the inlet guide vane There should be a certain radial gap between the sheet (31) and the outer surface of the inner cylinder (14), and the inlet (37) of the tangential inlet pipe (34) passes through the pipeline (35) and the gas-liquid mixing pump (36) connected, so that the inlet guide (31), the tangential inlet pipe (34), the pipeline (35) and the gas-liquid mixing pump (36) together form the gas-liquid mixing assembly (3); the water inlet pipe (441), the tee pipe (442) is connected with the drain pipe (443) to form the inlet and outlet pipe (44), and the water inlet (444) of the inlet and outlet pipe (44) is connected with the outlet of the lower head (131), and the circulating return water pump (45) passes through The return water pipeline (46) outside the cylinder is connected with the circulating return water inlet (41), the air flotation injector (43), the air flotation baffle (432), the internal return water pipeline (42), the circulating water inlet (41), The external return water pipeline (46), the circulating return water pump (45) and the inlet and outlet pipes (44) together form the circulating return water assembly (4). 2. The compact cyclone air flotation separation device for oily wastewater treatment according to claim 1, characterized in that: the helix angle of the inlet guide vane is 5°-15°, and the inlet guide vane (31) is in contact with the outer cylinder ( 11) The circumferential angle of the projection of the intersection line of the inner wall on the horizontal plane is 210°-330°. 3. The compact cyclone air flotation separation equipment for oily wastewater treatment according to claim 1, characterized in that: the air flotation injector (43) is mainly composed of a cylinder section (433), an air suction port (434), a shrink section (435), suction chamber (436), throat (437) and diffusion section (438), wherein the top of the air flotation injector (43) is connected to the return water pipeline (42) in the cylinder through a flange, The suction port (434) is connected with the gas circulation pipeline (23) in the cylinder. 4. The compact cyclone air flotation separation equipment for oily wastewater treatment according to claim 1, characterized in that: two air flotation injectors (43) are arranged laterally on the lower part of the outer body (11) outside the body, and The return water pipeline (46) is connected with the circulating return water pump (45).

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