An axial-flow cyclone floating oil-water separation device and method

Abstract

The present invention discloses an axial-flow cyclone floating oil-water separation device, which includes a hollow shaft. At the bottom of the inner wall of the hollow shaft, a sealed bearing is installed through a support fixing strip. A fixing column is installed in the inner ring of the sealed bearing. On the opposite sides of the two fixing columns, a hollow cylinder is fixedly installed. An integrated swirl blade is fixedly connected to the outer wall of the hollow cylinder, and impact holes are formed on the surface of the swirl blade. In this axial-flow cyclone floating oil-water separation device, through the design of the swirl blade and the conical impact holes thereon, when initial swirling is carried out, the sewage, oil and gas that enter the inner cavity of the hollow shaft 1 together can contact again in a small amount and accurately, further improving the contact rate between the gas and the oil.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and particularly to an axial flow cyclone float oil-water separation device and method. Background Art

[0002] At present, with the continuous popularization and promotion of the concepts of environmental protection and sustainable development, environmental governance work has gradually received attention and development. In environmental governance work, there are many categories, and sewage treatment is an important one. However, sewage also has many distinctions according to the pollutants it contains.

[0003] Based on the actual needs of environmental governance and the resource utilization of pollutants, especially in sewage treatment work, the separation of trace oils in oily sewage has also become a research hotspot in the current water treatment field. People urgently need separation technologies that are efficient, energy-saving, and small in volume. The hydrocyclone is one of the most effective separation devices. However, the hydrocyclone has an unsatisfactory removal effect on heavy oil droplets with a density close to that of water and fine oil droplets with a small particle size. One of the existing solutions is to add microbubbles to the hydrocyclone. The bubbles attach to the oil droplets, reducing the density of the oil droplet-bubble adhesion body, and achieving oil-water separation under the centrifugal force difference caused by the density difference. Therefore, the integrated air flotation and hydrocyclone (or cyclone float) treatment technology, which combines the two unit treatment technologies of hydrocyclone and air flotation, can effectively enhance the oil removal effect of the hydrocyclone.

[0004] The important key points in treating sewage by air flotation and hydrocyclone are the combination rate and tightness between gas and oil pollution. For example, in the existing technical solutions:

[0005] CN113636617B, a method and device for rapid pre-algae removal from water by weak swirl coupling with micro-air flotation;

[0006] CN116395905A, an axial flow cyclone float oil-water separation device and method.

[0007] When treating oily sewage, the air flotation and hydrocyclone treatment solutions adopted in the above technical solutions all use the method of gas-solid or gas-water collision to achieve the combination of oil pollution and gas, so as to increase the density difference between oil pollution and water.

[0008] The above technical solutions have some defects and problems. For example:

[0009] After air enters the sewage, the swirling action occurs through the swirling structure. After the oily sewage and gas enter the separation device, it is undeniable that part of the gas can combine with the sewage base and the oil stain, while more often when the gas is introduced, the gas moves upward from the bottom of the sewage. When it combines with the oil stain at the top, it will break the surface of the oil stain, causing another part of the gas to directly penetrate and unable to combine with the oil stain. During the swirling process, due to the action of centrifugal force, this part of the gas cannot be well utilized. Therefore, when a certain amount of gas is introduced, the combination rate of the gas and the oil stain cannot be guaranteed, that is, the oil removal efficiency can still be further improved.

[0010] Therefore, we propose an axial flow cyclone floating oil-water separation device and method to solve the above problems. Summary of the Invention

[0011] The purpose of the present invention is to provide an axial flow cyclone floating oil-water separation device and method to solve the problems proposed in the above background technology.

[0012] To achieve the above purpose, the present invention provides the following technical solutions:

[0013] An axial flow cyclone floating oil-water separation device includes a hollow shaft. At the bottom of the inner wall of the hollow shaft, a sealed bearing is installed through a support fixing strip. A fixed column is installed in the inner ring of the sealed bearing. On the opposite sides of the two fixed columns, a hollow cylinder is fixedly installed. An integral swirling blade is fixedly connected to the outer wall of the hollow cylinder, and impact holes are formed on the surface of the swirling blade.

[0014] Preferably, the impact hole is a conical hole, and the large-diameter end of the impact hole is designed to be inclined downward.

[0015] Preferably, the top of the fixed column at the upper layer is butt-connected with a rotating shaft, and stirring fan blades are arranged on the outer wall of the rotating shaft.

[0016] Preferably, a sealed cover is installed at the top of the inner cavity of the hollow shaft by threading, and an adjusting shaft is installed through the sealed cover at the top.

[0017] Preferably, a threaded structure is arranged on the upper part of the outer ring of the adjusting shaft, and the adjusting shaft is threadedly connected with the sealed cover. A sewage collection bucket is sleeved at the bottom of the outer ring of the adjusting shaft.

[0018] Preferably, both the top and the bottom of the sewage collection bucket are conical structures. A sewage discharge hole is formed at the bottom of the outer wall of the sewage collection bucket, and the sewage discharge hole is designed to be inclined.

[0019] Preferably, the maximum diameter of the sewage collection bucket is smaller than the inner diameter of the hollow shaft, and the diameter difference between the two is 0.5 - 1 cm. The lower half of the sewage collection bucket is in a hollow state.

[0020] Preferably, a reflux chamber is formed at the bottom of the adjusting shaft. Reflux holes are formed in the outer wall of the part of the reflux chamber located inside the sewage collection barrel, and there is a height difference between the bottom of the reflux holes at the bottom layer and the inner wall of the sewage collection barrel.

[0021] Preferably, a drain pipe is installed through the outer edge of the top of the sealing cover. A spring is sleeved between the adjusting shaft and the sewage collection barrel and the sealing cover, and a limiting stop is arranged at the bottom of the outer ring of the adjusting shaft.

[0022] An axial flow cyclone floating oil-water separation method includes the following steps:

[0023] Step 1: Installation of the equipment. The bottom of the oil-water separation equipment, that is, the bottom port of the hollow shaft, is docked and installed with the drain port of the sewage storage equipment.

[0024] Step 2: Preparation of the mixture. A large amount of gas is introduced into the sewage storage device, and the gas is pumped through the sewage after a period of time and sent into the inner cavity of the hollow shaft by a water pump.

[0025] Step 3: Secondary contact and combination of gas and oil. On the basis of Step 2, after the mixed sewage and the unreacted gas enter the inner cavity of the hollow shaft, through the actions of the swirl blades and the impact holes, the air and the sewage continuously shuttle between the swirl blades and collide, and then the secondary contact between the gas and the oil occurs in the inner cavity of the hollow shaft.

[0026] Step 4: Oil-water separation. On the basis of Step 3, after the sewage and the gas-oil mixed sewage that have undergone secondary contact and combination move upward, a vortex is formed by the stirring fan blades. The outer wall of the sewage collection barrel contacts the inner layer of the vortex, and part of the sewage and oil enter the sewage collection barrel for collection, thereby realizing the separation of oil and water.

[0027] Step 5: Tertiary contact and combination of gas and oil. On the basis of Step 4, the sewage that enters the sewage collection barrel together re-impacts and flows back into the vortex through the reflux holes and the reflux chamber. During the impact and reflux process, the sewage continuously impacts the vortex, enabling the gas to contact the sewage again, thereby realizing the third combination of oil and gas. Then, repeat the operation of Step 4. After repeating several times, the oil and water are separated to the maximum extent.

[0028] Step 6: Drainage. On the basis of Step 4 and Step 5, the water after oil separation flows continuously upward along the gap between the sewage collection barrel and the hollow shaft, and finally is discharged from the drain pipe.

[0029] Compared with the prior art, the beneficial effects of the present invention are:

[0030] The axial-flow cyclone oil-water separation device, through the design of the swirl blades and the conical impact holes thereon, can enable the sewage, oil and gas that enter the inner cavity of the hollow shaft 1 together to come into contact again in a small amount and precisely during the initial swirling, further improving the contact rate between the gas and the oil.

[0031] The axial-flow cyclone oil-water separation device, through the design and use of the sewage collection bucket, adjustment shaft, downwardly inclined sewage discharge hole, sewage discharge hole and stirring fan blades, when centrifugally stratifying the mixed sewage that has come into contact and combined with the gas, the oil combination located in the inner layer directly flows into the sewage collection bucket for recovery, and when recovering the oil combination, the excess sewage can be recycled, thereby realizing the separation of the oil combination and the sewage, effectively solving the problem that when simply separating the oil and sewage mixture from the sewage by centrifugal force, a large amount of oil and sewage are discharged synchronously and need to be treated again.

[0032] The axial-flow cyclone oil-water separation device, through the design and use of the adjustment shaft, the return holes and the return cavity thereon, can not only discharge the sewage in the collected oil and sewage mixture again, leaving the oil mixture for collection and storage, but also enable this part of the sewage to directly impact the inner layer of the vortex-shaped mixed sewage again during the process of discharging the excess sewage removed from the oil, thereby realizing the third contact between the gas and the oil and further improving the efficiency of removing sewage and oil. Brief Description of the Drawings

[0033] Figure 1 is a schematic structural diagram of the present invention;

[0034] Figure 2 is a cross-sectional view of the structure of the present invention;

[0035] Figure 3 is an exploded view of the structure at the swirl blades of the present invention;

[0036] Figure 4 is a cross-sectional view of the sewage collection bucket of the present invention.

[0037] In the figure: 1, hollow shaft; 2, support fixing strip; 3, sealed bearing; 4, fixed column; 5, hollow cylinder; 6, swirl blade; 7, impact hole; 8, rotating shaft; 9, stirring fan blade; 10, sealing cover; 11, adjustment shaft; 12, sewage collection bucket; 13, sewage discharge hole; 14, return cavity; 15, return hole; 16, limit baffle; 17, spring; 18, drain pipe. Detailed Description of the Invention

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] The present invention provides a technical solution for an axial flow cyclone floating oil-water separation device:

[0040] Embodiment 1:

[0041] like Figure 1 , Figure 2 and Figure 3 As shown, the oil-water separation device mainly includes a hollow shaft 1, a supporting fixing bar 2 is installed at the bottom of the inner wall of the hollow shaft 1 through a fastener, a sealing bearing 3 is installed at the opposite end of the supporting fixing bar 2, a fixing column 4 is inserted in the inner ring of the sealing bearing 3, a hollow cylinder 5 is fixedly installed at the opposite ends of the two fixing columns 4, a rotary blade 6 is arranged on the outer wall of the hollow cylinder 5, and an impact hole 7 is opened on the surface of the rotary blade 6.

[0042] The bottom of the hollow shaft 1 is an open port, the impact hole 7 is a tapered hole, and the large-diameter end of the impact hole 7 faces downward.

[0043] In this embodiment, when using this technical solution, firstly, the bottom of the hollow shaft 1 is docked and installed with the sewage inlet pipe through a flange structure. The installation and use method can refer to the prior art CN116395905A, an axial flow cyclone floating oil and water separation device and method. Of course, in this technical solution, a water pump structure can be added to transport sewage. When the gas and sewage enter the inner cavity of the hollow shaft 1 from the bottom, the sewage mixture has a certain speed. In this way, when the sewage mixture impacts the lower surface of the rotary blade 6, it will drive the entire rotary blade 6 and the hollow cylinder 5 to rotate continuously. At this time, the rapidly rotating rotary blade 6 can guide and stir the mixed sewage to generate an initial vortex.

[0044] When the mixed sewage moves along the path of the rotary blades 6, when the space between each two rotary blades 6 is not filled with mixed sewage, the mixed sewage is pressed against the lower surface of the rotary blades 6 by the centrifugal force generated by the rotation of the rotary blades 6, and the unused gas is located in the idle area. Part of the mixed sewage will be thrown into the adjacent area along the impact hole 7, so that the thrown mixed sewage will contact the gas again in small amounts, allowing the gas to contact the oil more accurately and then combine;

[0045] When the mixed sewage fills the space between every two swirler blades 6, the mixed gas and sewage continuously surge between the swirler blades 6, which can also increase the contact and combination between the gas and the oil stain.

[0046] In this technical solution, through the design of the swirler blades 6 and the conical impact holes 7 thereon, when initial swirling occurs, the sewage, oil stain, and gas that enter the inner cavity of the hollow shaft 1 together can come into precise contact in small amounts again, further improving the contact rate between the gas and the oil stain.

[0047] Embodiment 2:

[0048] As Figure 2 and Figure 3 shown, this oil-water separation device mainly includes a hollow shaft 1. At the bottom of the inner wall of the hollow shaft 1, a support fixing strip 2 is installed through fasteners. At the opposite ends of the support fixing strip 2, a sealed bearing 3 is installed. A fixing column 4 is inserted into the inner ring of the sealed bearing 3. At the top of the upper fixing column 4, a rotating shaft 8 is butt-jointed and installed. On the outer wall of the rotating shaft 8, stirring fan blades 9 are provided.

[0049] As Figure 1 and Figure 4 shown, an adjusting shaft 11 is inserted into the upper part of the inner cavity of the hollow shaft 1. At the bottom of the outer ring of the adjusting shaft 11, a sewage collection bucket 12 is sleeved. A sewage discharge hole 13 is provided below the outer wall of the sewage collection bucket 12.

[0050] Among them, the sewage collection bucket 12 is a hollow bucket structure with both upper and lower ends being conical, and the sewage discharge hole 13 is obliquely upwardly opened on the outer wall of the sewage collection bucket 12.

[0051] Among them, the diameter of the largest outer diameter part of the sewage collection bucket 12 is smaller than the inner diameter of the hollow shaft 1, and the diameter difference between the two is controlled between 0.5 - 1 cm.

[0052] Among them, as Figure 4 shown, a return cavity 14 is provided at the bottom of the adjusting shaft 11, and return holes 15 are opened on the outer wall of the part of the return cavity 14 located inside the sewage collection bucket 12.

[0053] Among them, as Figure 1 and Figure 2 shown, a sealing cover 10 is threadedly installed at the top of the inner cavity of the hollow shaft 1. A drain pipe 18 is installed through the outer edge of the sealing cover 10. The bottom of the sealing cover 10 is a conical structure. The bottom of the drain pipe 18 is directly above the area between the sewage collection bucket 12 and the inside of the hollow shaft 1. In this way, the sewage flowing up from the bottom continuously moves upward through the gap, changes the movement direction at the gap, and can directly move upward and be discharged from the drain pipe 18. During actual use, a hose or other pipe needs to be butt-jointed at the drain pipe 18 to collect the treated sewage.

[0054] Among them, as Figure 2 shown, a threaded structure is provided at the top of the outer wall of the adjusting shaft 11. A spring 17 is sleeved on the outer ring of the adjusting shaft 11, and a limit baffle 16 is designed at the bottom of the outer wall of the adjusting shaft 11. The main purpose of designing the spring 17 is to fix the sewage collection bucket 12 in the inner cavity of the hollow shaft 1 through mutual force and maintain a certain stability when being impacted by the mixed sewage. The main function of the limit baffle 16 is to limit the extreme position of the sewage collection bucket 12 on the adjusting shaft 11.

[0055] In this embodiment, based on Embodiment 1, after the preliminary spinning treatment of the mixed sewage, the gas has further contacted and combined with the oil stains in the sewage, that is, the density difference between the water, oil stains and the gas mixture has been increased. At this time, the stirring fan blade 9 will rotate, and when rotating, it stirs the mixed sewage remaining between the sewage collection bucket 12 and the stirring fan blade 9, and then generates a vortex structure. That is, through the action of centrifugal force, the oil stain-gas mixture is separated from the sewage. At this time, the sewage collection bucket 12 is just located at the center of the eddy current, and the position of the sewage collection bucket 12 is appropriately adjusted through the adjusting shaft 11, so that the outer surface of the sewage collection bucket 12 can contact the mixed sewage. When contacting the mixed sewage, due to the existence of centrifugal force, the gas-oil stain mixed sewage is in the inner layer, that is, it directly contacts the outer wall of the sewage collection bucket 12. Since the mixed sewage moves upward as a whole, under the design and use of the inclined downward sewage discharge hole 13, the gas-oil stain mixed sewage will carry a small amount of sewage and enter the inner cavity of the sewage collection bucket 12 through the sewage discharge hole 13 for storage. The sewage that enters the inner cavity of the sewage collection bucket 12 will enter the return cavity 14 along the return hole 15 and finally be discharged from the bottom and return to the mixed sewage again. The returned sewage will directly impact the inner side of the eddy current-like sewage mixture, and then carry the gas and enter the mixed sewage again to perform the third contact and combination action of the gas and oil stains.

[0056] Among them, the bottommost return hole 15 is at a short distance from the bottom of the inner wall of the sewage collection bucket 12. In this way, in the inner cavity of the sewage collection bucket 12, without any external interference, the oil stain combination always floats on the upper layer of the sewage. Even if there is sewage return, there will still be some water remaining, avoiding the oil stains from returning to the sewage mixture again with the water not being discharged at all.

[0057] In the description of the present invention, it should also be noted that, unless otherwise clearly defined and limited, the terms "arranged", "installed", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An axial flow cyclone floating oil-water separation device, comprising a hollow shaft (1), characterized in that: Two sealed bearings (3) are installed at the bottom of the inner wall of the hollow shaft (1) through a supporting fixing strip (2), and a fixing column (4) is installed in the inner ring of each of the two sealed bearings (3), and a hollow cylinder (5) is fixedly installed on the opposite side of the two fixing columns (4), and a rotary blade (6) is integrally fixedly connected to the outer wall of the hollow cylinder (5), and an impact hole (7) is provided on the surface of the rotary blade (6). A sealing cover (10) is threadedly installed at the top of the inner cavity of the hollow shaft (1), and an adjusting shaft (11) is installed through the top of the sealing cover (10), and a dirt collecting bucket (12) is sleeved on the bottom of the outer ring of the adjusting shaft (11), and a reflux chamber (14) is provided at the bottom of the adjusting shaft (11), and the reflux chamber (14) is located in the inner cavity of the dirt collecting bucket (12). A reflux hole (15) is provided on the outer wall of the dirt collecting bucket (12); the adjusting shaft (11) is located between the dirt collecting bucket (12) and the sealing cover (10) and is provided with a spring (17); a rotating shaft (8) is butt-jointedly mounted on the top of the fixing column (4) at the upper layer; a stirring fan blade (9) is provided on the outer wall of the rotating shaft (8); the top and bottom of the dirt collecting bucket (12) are both conical structures; a drainage hole (13) is provided on the lower part of the outer wall of the dirt collecting bucket (12); and the drainage hole (13) is designed to be inclined; the maximum diameter of the dirt collecting bucket (12) is smaller than the inner diameter of the hollow shaft (1), and the diameter difference between the two is 0.5-1 cm; the lower half of the dirt collecting bucket (12) is in a hollow state; and there is a height difference between the reflux hole (15) located at the bottom layer and the bottom of the inner wall of the dirt collecting bucket (12).

2. The axial flow cyclone floating oil-water separation device according to claim 1, characterized in that: The impact hole (7) is a tapered hole, and the large-diameter end of the impact hole (7) is designed to be tilted downward.

3. The axial flow cyclone floating oil-water separation device according to claim 1, characterized in that: A threaded structure is provided on the upper portion of the outer ring of the adjusting shaft (11), and the adjusting shaft (11) is threadedly connected to the sealing cover (10).

4. The axial flow cyclone floating oil-water separation device according to claim 1, characterized in that: A drainage pipe (18) is installed through the outer edge of the top of the sealing cover (10), and a limit stopper (16) is provided at the bottom of the outer ring of the adjustment shaft (11).

5. An axial flow cyclone floating oil and water separation method, characterized in that: The device according to any one of claims 1 to 4 comprises the following steps: Step 1: installing the device, connecting the bottom port of the oil-water separation device, i.e. the hollow shaft (1), with the drain outlet of the sewage storage device; Step 2: prepare a mixture, introduce a large amount of gas into the interior of the sewage storage device, and use a water pump to extract the sewage after a period of time after the gas has passed through it and send it to the inner cavity of the hollow shaft (1); Step 3: Gas-oil secondary contact combination. On the basis of step 2, after the mixed sewage and unreacted gas enter the inner cavity of the hollow shaft (1), the air and sewage are continuously shuttled between the swirl blades (6) and impact holes (7), and collision occurs, and then the gas and oil are in secondary contact in the inner cavity of the hollow shaft (1); Step 4, oil-water separation. On the basis of step 3, after the sewage and the gas-oil mixture that have been combined through the secondary contact move upward, a vortex is formed by stirring the fan blades (9), and the outer wall of the sewage collecting barrel (12) contacts the inner layer of the vortex, allowing part of the sewage and oil to enter the sewage collecting barrel (12) for collection, thereby achieving separation of the oil and water; Step 5, three-way contact and combination of gas and oil. On the basis of step 4, the sewage that has entered the sewage collecting barrel (12) is impacted and refluxed back into the vortex through the reflux hole (15) and the reflux chamber (14). During the impact and reflux process, the vortex is continuously impacted, so that the gas contacts the sewage again, and then the third combination of oil and gas is achieved. Then, the action of step 4 is repeated. After multiple cycles, the oil and water are separated to the greatest extent. Step six, drainage. Based on steps four and five, the water after the oil and dirt separation continuously flows upward along the gap between the dirt collecting bucket (12) and the hollow shaft (1), and is finally discharged from the drainage pipe (18).

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