Double-barrel type rotational flow air flotation equipment

Abstract

The utility model relates to double-cylinder type rotational flow air floatation equipment, aiming at solving the problems of low separation efficiency, large occupied area of equipment and complex process flow due to the fact that an air floatation tank is adopted for oil-water separation in the existing oil pollutant treatment. An inner cylinder and an outer cylinder tank are concentrically arranged, an overflow groove is formed in the upper end of the outer cylinder tank, a rotational flow guide plate is arranged in a rotational flow area between the inner cylinder and the outer cylinder tank, a dissolved air water inlet is connected with a dissolved air water inlet pipe, an oily sewage inlet is connected with an oily sewage inlet pipe, and a conical mud bucket of the outer cylinder tank is connected with a blow-off pipe. The outer cylinder tank is connected with a gas filter through an exhaust pipe; a flow stabilizing area in the inner cylinder is provided with a hydrophilic and oleophobic filter element, the hydrophilic and oleophobic filter element is connected with a drainage pipe through a vertical pipe, the two ends of the drainage pipe are connected with a main water outlet pipe and a secondary water outlet pipe respectively, and the secondary water outlet pipe is connected with a dissolved air tank; the dissolved air tank is connected with a dissolved air water inlet pipe; and the gas filter is connected with the dissolved air tank. The equipment is small in occupied area and high in separation efficiency on various kinds of sewage containing oil and suspended solids.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment equipment, in particular to a double-barrel swirl air flotation device. Background Art

[0002] With the continuous development of industrial technology and the emergence of new pollutants, the treatment of oily wastewater has become a problem in many industrial productions. Oily wastewater itself has the characteristics of large water volume, wide pollution range, more complex water quality and difficult biodegradation. The discharge of oily wastewater causes water resource pollution and oil resource waste, and at the same time has a great impact on the environment and human health. The treatment of oily sewage mainly focuses on the treatment of oily sewage generated in oil fields. Oil pollutants mainly exist in four forms, namely dissolved oil, dispersed oil, emulsified oil and finely dispersed oil. In particular, the particle size of emulsified oil is below 10μm, which is difficult to remove.

[0003] At present, the treatment of oil pollutants usually uses an air flotation tank for oil-water separation. The air flotation tank generally consists of three parts: a flocculation chamber, a bubble contact chamber and a separation chamber. In addition to the air flotation tank itself, other auxiliary facilities are also required to be combined with it, such as a pressure dissolved air flotation tank, a pressure dissolved air tank and a dissolved air release device, etc. This makes the equipment occupy a large area. During the oil-water separation process, microbubbles are generated by a microbubble generating device and injected into the air flotation device. A large number of microbubbles combine with the oil, causing the oil to float to the surface of the sewage, and then collecting and treating these oils and fats to achieve oil-water separation; this method only has the function of gas flotation, and its separation efficiency can only reach about 80%. With the improvement of environmental protection and emission reduction standards, the emission requirements for suspended substances and oil pollutants are getting higher and higher. When the separation efficiency does not meet the national emission standards, subsequent treatments such as filtration, adsorption or membrane separation are required, which undoubtedly increases the process and also increases the maintenance cost accordingly. Summary of the Invention

[0004] The utility model provides a double-barrel swirl air flotation device to solve the problems of low separation efficiency, large equipment floor area and complex process flow in the existing treatment of oil pollutants using an air flotation tank for oil-water separation.

[0005] The technical solution adopted by the utility model to solve the above problems is as follows:

[0006] A double-barrel swirl air flotation device, which comprises an outer barrel tank, an inner barrel, an annular partition board, a group of hydrophilic and oleophobic filters, a group of vertical pipes, a drain pipe, a swirl guide plate, an oily sewage inlet pipe, a main outlet pipe, a secondary outlet pipe, a water pump, a dissolved air tank, a dissolved air water inlet pipe, a gas filter, an exhaust pipe, a filter connection pipe and an air inlet pipe;

[0007] The lower part of the outer cylinder tank is a conical mud bucket, the middle part is a cylindrical cylinder, and the top is an arc-shaped body. An overflow groove is arranged at the upper end of the side wall of the cylindrical cylinder, and an overflow port communicating with the overflow groove is arranged on the side wall of the cylindrical cylinder. An oil drain pipe is fixedly connected to the bottom of the overflow groove, a sewage drain pipe is fixedly connected to the bottom of the conical mud bucket, and a breathing valve is arranged on the arc-shaped body.

[0008] The inner cylinder is arranged in the cylindrical cylinder of the outer cylinder tank, the annular baffle is located between the inner cylinder and the cylindrical cylinder, the inner ring of the annular baffle is sealed and connected to the bottom of the inner cylinder, the outer ring of the annular baffle is sealed and connected to the inner wall of the cylindrical cylinder, the upper end of the inner cylinder is connected to the outer cylinder tank, the cavity between the inner cylinder and the cylindrical cylinder is a cyclone area, the middle area in the inner cylinder is a steady flow area, and a dissolved air water inlet and an oily wastewater inlet are arranged on the cylindrical cylinder and located at the lower part of the cyclone area;

[0009] A group of hydrophilic and oleophobic filter elements are arranged in the steady flow area, the upper end of the vertical pipe is connected to the hydrophilic and oleophobic filter element, the lower end of the vertical pipe is connected to the drain pipe, the drain pipe is horizontally arranged in the middle of the conical mud bucket, one end of the drain pipe is the main water outlet, and the other end of the drain pipe is the secondary water outlet. A plurality of swirl guide plates are arranged in the swirl area, and the plurality of swirl guide plates are evenly distributed on the outer wall of the inner cylinder and fixedly connected to the inner cylinder;

[0010] The oily sewage inlet pipe is connected to the oily sewage inlet, the main outlet pipe is connected to the main outlet, one end of the secondary outlet pipe is connected to the secondary outlet, the other end of the secondary outlet pipe is connected to the dissolved air tank, a water pump is installed on the secondary outlet pipe, one end of the dissolved air water inlet pipe is connected to the dissolved air tank, the other end of the dissolved air water inlet pipe is connected to the dissolved air water inlet, one end of the filter pipe is connected to the secondary outlet pipe, the other end of the filter pipe is connected to the gas filter, the other end of the gas filter is connected to the air inlet pipe, one end of the exhaust pipe is connected to the air inlet pipe, and the other end of the exhaust pipe is connected to the exhaust port of the outer cylinder tank.

[0011] Furthermore, the hydrophilic and oleophobic filter element includes a filter element support plate, a hydrophilic and oleophobic membrane, a filter element cover and a filter element base. The filter element support plate is a cylindrical structure, and a plurality of water-permeable holes are arranged on the filter element support plate. The hydrophilic and oleophobic membrane is arranged along the inner wall of the filter element support plate. The filter element cover and the filter element base are buckled up and down on the filter element support plate, and a water outlet is arranged at the center of the filter element base.

[0012] Furthermore, the water inlets of the dissolved air water inlet and the oily wastewater inlet are tangential inlet.

[0013] Furthermore, the central axis of the inner cylinder coincides with the central axis of the outer cylinder.

[0014] The utility model separates two-phase mixtures such as liquid-liquid, liquid-solid, and liquid-gas with a certain density difference by using a double-barrel swirl air flotation device, combines swirl centrifugation, air flotation, and membrane separation, installs a swirl guide plate in the swirl area, and promotes the collision and adhesion of bubbles with floating oil and floating slag under the action of the swirl field and the swirl guide plate. Then, the uncompletely treated oil pollution is separated for the second time through a hydrophilic and oleophobic filter element, thereby improving the separation effect of the swirl air flotation device on suspended substances and oil substances. Compared with the prior art, not only the separation efficiency can reach 97%, but also the process flow is simplified.

[0015] Second, the double-barrel swirl air flotation device of the utility model is of a vertical tank structure, which reduces the floor area while improving the separation efficiency, and realizes the recycling of return water and gas through the connection between the dissolved air tank and the gas filter, saving energy and environmental protection and reducing costs.

[0016] Third, when using the double-barrel swirl air flotation device of the utility model for water-oil separation, no chemical reagents are added, which is a pure physical method, so there is no secondary pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the overall structural schematic diagram of the utility model;

[0018] Figure 2 is the structural schematic diagram of the hydrophilic and oleophobic filter element;

[0019] Figure 3 is the sectional view of the outer cylinder tank;

[0020] Figure 4 is the schematic diagram of the tangential water inlet mode of the dissolved air water inlet and the oil-containing sewage inlet. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] Detailed Description of Embodiment 1: Combine Figure 1 and Figure 3 to describe this embodiment. This embodiment includes an outer cylinder tank 1, an inner cylinder 2, an annular partition 3, a group of hydrophilic and oleophobic filter elements 4, a group of vertical pipes 5, a drain pipe 6, a swirl guide plate 7, an oil-containing sewage inlet pipe 8, a main outlet pipe 9, a secondary outlet pipe 10, a water pump 11, a dissolved air tank 12, a dissolved air water inlet pipe 13, a gas filter 14, an exhaust pipe 15, a filter connection pipe 16, and an inlet pipe 27;

[0022] The lower part of the outer cylinder tank 1 is a conical mud hopper 1-1, the middle part is a cylindrical barrel 1-2, and the top part is an arc-shaped body 1-3. An overflow groove 1-4 is arranged at the upper end of the side wall of the cylindrical barrel 1-2. The overflow groove 1-4 is used to collect waste oil. An overflow port 1-7 communicating with the overflow groove 1-4 is arranged on the side wall of the cylindrical barrel 1-2. A drain pipe 1-5 is fixedly connected to the bottom of the overflow groove 1-4. A sewage discharge pipe 1-6 is fixedly connected to the bottom of the conical mud hopper 1-1. A breathing valve 1-10 is arranged on the arc-shaped body 1-3. The breathing valve 1-10 is used to prevent the tank body from bursting due to excessive pressure inside the tank; Support frames 1-11 are arranged on both sides of the outer wall of the conical mud hopper 1-1;

[0023] The inner cylinder 2 is arranged in the cylindrical barrel 1-2 of the outer cylinder tank 1. The annular partition 3 is located between the inner cylinder 2 and the cylindrical barrel 1-2. The inner ring of the annular partition 3 is hermetically connected to the bottom of the inner cylinder 2, and the outer ring of the annular partition 3 is hermetically connected to the inner wall of the cylindrical barrel 1-2. The upper end of the inner cylinder 2 communicates with the outer cylinder tank 1. The cavity between the inner cylinder 2 and the cylindrical barrel 1-2 is a swirl zone 17, and the middle area in the inner cylinder 2 is a steady flow zone 18. A dissolved gas water inlet 1-8 and an oily sewage inlet 1-9 are arranged on the cylindrical barrel 1-2 and below the swirl zone 17;

[0024] A group of hydrophilic and oleophobic filters 4 is arranged in the steady flow zone 18. A group of vertical pipes 5 corresponds to the group of hydrophilic and oleophobic filters 4 one by one. The upper end of the vertical pipe 5 is communicated with the hydrophilic and oleophobic filter 4, and the lower end of the vertical pipe 5 is communicated with the drain pipe 6. The drain pipe 6 is horizontally arranged in the middle of the conical mud hopper 1-1. One end of the drain pipe 6 is the main water outlet 6-1, and the other end of the drain pipe 6 is the secondary water outlet 6-2. A plurality of swirl guide plates 7 are arranged in the swirl zone 17. The plurality of swirl guide plates 7 are evenly distributed on the outer wall of the inner cylinder 2 and fixedly connected to the inner cylinder 2. The flow guiding direction of the swirl guide plate 7 is consistent with the swirl velocity direction;

[0025] The oily wastewater inlet pipe 8 is connected to the oily wastewater inlet 1-9, and an oily wastewater inlet valve 8-1 is installed on the oily wastewater inlet pipe 8. The main outlet pipe 9 is connected to the main outlet 6-1, and an outlet valve 9-1 is installed on the main outlet pipe 9. The outlet valve 9-1 is used to control the drainage flow. One end of the secondary outlet pipe 10 is connected to the secondary outlet 6-2, and the other end of the secondary outlet pipe 10 is connected to the dissolved air tank 12. The secondary outlet pipe 10 is installed with a secondary outlet valve 10-1 and a water pump 11. The secondary outlet valve 10-1 is used to control the drainage flow. One end of the dissolved air water inlet pipe 13 is connected to the secondary outlet 6-2, and the other end of the secondary outlet pipe 10 is connected to the dissolved air tank 12. The secondary outlet valve 10-1 and a water pump 11 are installed on the secondary outlet pipe 10. The secondary outlet valve 10-1 is used to control the drainage flow. The end is connected with the dissolved air tank 12, the dissolved air tank 12 is used to form dissolved air water, the other end of the dissolved air water inlet pipe 13 is connected with the dissolved air water inlet port 1-8, and the dissolved air water inlet pipe 13 is installed with a dissolved air water inlet valve 13-1, one end of the filter pipe 16 is connected with the secondary water outlet pipe 10, the other end of the filter pipe 16 is connected with the gas filter 14, the other end of the gas filter 14 is connected with the air intake pipe 27, the gas filter 14 is used to filter gas impurities, one end of the exhaust pipe 15 is connected with the air intake pipe 27, and the other end of the exhaust pipe 15 is connected with the exhaust port of the outer cylinder tank 1.

[0026] Specific implementation method 2: Combination Figure 2 This embodiment is described. This embodiment is a hydrophilic oleophobic filter element 4 including a filter element support plate 4-1, a hydrophilic oleophobic membrane 4-2, a filter element cover 4-3 and a filter element base 4-4. The filter element support plate 4-1 is a cylindrical structure. The filter element support plate 4-1 is provided with several water-permeable holes 4-1-1. The hydrophilic oleophobic membrane 4-2 is provided along the inner wall of the filter element support plate 4-1. The filter element cover 4-3 and the filter element base 4-4 are buckled up and down on the filter element support plate 4-1. The center position of the filter element base 4-4 is provided with a water outlet, which is mounted on the vertical pipe 5. The number of a group of hydrophilic oleophobic filter elements 4 is 2 to 4. The undisclosed technical features in this embodiment are the same as those in the specific embodiment 1.

[0027] Specific implementation method three: Combination Figure 4 This embodiment is described. In this embodiment, the water inlet 1-8 of the dissolved air water and the water inlet 1-9 of the oily wastewater are tangentially inlet. Entering the tank body along the tangential direction of the outer wall of the inner cylinder can generate a greater swirl velocity, a greater centrifugal acceleration, and a more stable swirl, which is conducive to the interaction between bubbles and oil droplets. The undisclosed technical features in this embodiment are the same as those in the first embodiment.

[0028] Specific implementation method four: Combination Figure 3 and Figure 4 This embodiment is described in which the central axis of the inner cylinder 2 coincides with the central axis of the outer cylinder 1. The undisclosed technical features in this embodiment are the same as those in the first embodiment.

[0029] Open the oil-containing sewage inlet valve 8-1. The oil-containing sewage enters the swirl zone 17 through the oil-containing sewage inlet pipe 8. Open the dissolved air water inlet valve 13-1. The dissolved air water enters the swirl zone 17 through the dissolved air water inlet pipe 13. Since both the oil-containing sewage and the dissolved air water enter the swirl zone 17 tangentially, a rotating flow field is formed in the cylindrical cavity between the outer cylinder tank 1 and the inner cylinder 2. Under the action of the swirl flow field and the swirl guide plate 7, the bubbles collide and adhere to the floating oil and floating scum and move upward along the central axis direction, and then are discharged to the overflow trough 1-4 through the overflow port 1-7 of the outer cylinder tank 1, thus achieving the purpose of two-phase separation. The oil-containing sewage treated by the swirl zone 17 enters the steady flow zone 18. The hydrophilic and oleophobic filter element 4 in the steady flow zone 18 filters the sewage treated by the swirl zone 17 again. The hydrophilic and oleophobic membrane 4-2 blocks the residual floating oil and floating scum outside the hydrophilic and oleophobic filter element 4. The treated water enters the inside of the hydrophilic and oleophobic filter element 4 and is discharged along the vertical pipe 5 and the drain pipe 6 to achieve the purpose of improving the separation efficiency.

[0030] The water pump 11 pumps water into the dissolved air tank 12. The water level in the dissolved air tank 12 is detected by the water level gauge inside to control the flow rate of the secondary drainage pipe 10, realizing the recycling of the treated water.

[0031] The gas enters through the exhaust pipe 15, is filtered by the gas filter 14 and then enters the dissolved air tank 12, realizing the recycling of the gas.

[0032] The dissolved air tank 12 manufactures the treated water and the gas into dissolved air water with tiny bubbles through a special internal structure and enters the outer cylinder tank 1 through the dissolved air water inlet pipe 13.

Claims

1. A double-barrel swirl air flotation device, characterized in that: The double-barrel swirl air flotation device includes an outer barrel tank (1), an inner barrel (2), an annular partition (3), a group of hydrophilic and oleophobic filters (4), a group of vertical pipes (5), a drain pipe (6), a swirl guide plate (7), an oily sewage inlet pipe (8), a main outlet pipe (9), a secondary outlet pipe (10), a water pump (11), a dissolved air tank (12), a dissolved air water inlet pipe (13), a gas filter (14), an exhaust pipe (15), a filter connecting pipe (16), and an air inlet pipe (27); The lower part of the outer barrel tank (1) is a conical mud hopper (1-1), the middle part is a cylindrical barrel (1-2), and the top is an arc-shaped body (1-3). An overflow groove (1-4) is arranged at the upper end of the side wall of the cylindrical barrel (1-2). An overflow port (1-7) communicating with the overflow groove (1-4) is arranged on the side wall of the cylindrical barrel (1-2). An oil drain pipe (1-5) is fixedly connected to the bottom of the overflow groove (1-4). A sewage discharge pipe (1-6) is fixedly connected to the bottom of the conical mud hopper (1-1). A breathing valve (1-10) is arranged on the arc-shaped body (1-3). The inner barrel (2) is arranged in the cylindrical barrel (1-2) of the outer barrel tank (1). The annular partition (3) is located between the inner barrel (2) and the cylindrical barrel (1-2). The inner ring of the annular partition (3) is hermetically connected to the bottom of the inner barrel (2), and the outer ring of the annular partition (3) is hermetically connected to the inner wall of the cylindrical barrel (1-2). The upper end of the inner barrel (2) communicates with the outer barrel tank (1). The cavity between the inner barrel (2) and the cylindrical barrel (1-2) is a swirl area (17), and the middle area in the inner barrel (2) is a stable flow area (18). A dissolved air water inlet (1-8) and an oily sewage inlet (1-9) are arranged on the cylindrical barrel (1-2) and below the swirl area (17). A group of hydrophilic and oleophobic filters (4) are arranged in the stable flow area (18). The upper end of the vertical pipe (5) is communicated with the hydrophilic and oleophobic filter (4), and the lower end of the vertical pipe (5) is communicated with the drain pipe (6). The drain pipe (6) is horizontally arranged in the middle of the conical mud hopper (1-1). One end of the drain pipe (6) is the main water outlet (6-1), and the other end of the drain pipe (6) is the secondary water outlet (6-2). A plurality of swirl guide plates (7) are arranged in the swirl area (17). The plurality of swirl guide plates (7) are evenly distributed on the outer wall of the inner barrel (2) and fixedly connected to the inner barrel (2). The oily wastewater inlet pipe (8) is connected to the oily wastewater inlet (1-9), the main outlet pipe (9) is connected to the main outlet (6-1), one end of the secondary outlet pipe (10) is connected to the secondary outlet (6-2), the other end of the secondary outlet pipe (10) is connected to the dissolved air tank (12), a water pump (11) is installed on the secondary outlet pipe (10), one end of the dissolved air water inlet pipe (13) is connected to the dissolved air tank (12), and the dissolved air water inlet pipe (13) is connected to the dissolved air tank (12). The other end of (13) is connected to the dissolved air water inlet (1-8), one end of the filter pipe (16) is connected to the secondary water outlet pipe (10), the other end of the filter pipe (16) is connected to the gas filter (14), the other end of the gas filter (14) is connected to the air inlet pipe (27), one end of the exhaust pipe (15) is connected to the air inlet pipe (27), and the other end of the exhaust pipe (15) is connected to the exhaust port of the outer cylinder tank (1).

2. A double-cylinder swirl air flotation device according to claim 1, characterized in that: The hydrophilic and oleophobic filter element (4) comprises a filter element support plate (4-1), a hydrophilic and oleophobic membrane (4-2), a filter element cover (4-3) and a filter element base (4-4); the filter element support plate (4-1) is a cylindrical structure; a plurality of water permeable holes (4-1-1) are arranged on the filter element support plate (4-1); the hydrophilic and oleophobic membrane (4-2) is arranged along the inner wall of the filter element support plate (4-1); the filter element cover (4-3) and the filter element base (4-4) are buckled up and down on the filter element support plate (4-1); and a water outlet hole is arranged at the center of the filter element base (4-4).

3. A double-barrel swirl air flotation device according to claim 1, characterized in that: The water inlet of the dissolved air water inlet (1-8) and the oily wastewater inlet (1-9) is tangential inlet.

4. A double-barrel swirl air flotation device according to claim 1, characterized in that: The central axis of the inner cylinder (2) coincides with the central axis of the outer cylinder tank (1).

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