Axial-flow cyclone oil-water separation device and method

Abstract

The invention discloses an axial-flow type cyclone oil-water separation device which comprises a hollow shaft, a sealing bearing is installed at the bottom of the inner wall of the hollow shaft through a supporting and fixing strip, fixing columns are installed in the inner ring of the sealing bearing, and a hollow cylinder is fixedly installed on the opposite sides of the two fixing columns. And the outer wall of the hollow cylinder is integrally and fixedly connected with a spinning blade, and the surface of the spinning blade is provided with an impact hole. According to the axial-flow type cyclone floating oil-water separation device, through the design of the cyclone blades and the conical impact holes in the cyclone blades, sewage, greasy dirt and gas entering the inner cavity of the hollow shaft 1 together can make small-amount accurate contact again during initial cyclone making, and the contact rate between the gas and the greasy dirt is further increased.

Description

Technical Field

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

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

[0003] Based on the actual needs of environmental governance and resource utilization of pollutants, especially in sewage treatment, the separation of trace oils in oily sewage has also become a research hotspot in the field of water treatment today. People are in urgent need of efficient, energy-saving and small-volume separation technology, and cyclone separators are one of the most effective separation equipment. However, the cyclone is not ideal for removing heavy oil droplets with a density close to that of water and fine oil droplets with a smaller particle size. One of the existing solutions is to add microbubbles to the cyclone, and 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 flotation cyclone integrated (or cyclone flotation) treatment technology, which combines the two unit treatment technologies of cyclone and flotation, can effectively enhance the cyclone deoiling effect.

[0004] The key point of flotation cyclone treatment of sewage lies in the combination rate and tightness between gas and oil, such as the existing technical solution: CN113636617B, a method and device for rapid pre-algae removal in water bodies coupled with weak cyclone and micro-flotation; CN116395905A, an axial flow cyclone floating oil and water separation device and method.

[0005] When treating wastewater containing oil, the above-mentioned technical solutions all use flotation cyclone treatment solutions that use gas-solid or gas-water collision to achieve the combination of oil and gas, thereby increasing the density difference between oil and water.

[0006] The above technical solution has some defects and problems, such as: After the air enters the sewage, it is spun through the vortex structure. After the oily sewage and gas enter the separation device, it is undeniable that a part of the gas can combine with the sewage base and the oil. What's more, when the gas is introduced, the gas moves upward from the bottom of the sewage. When it combines with the oil at the top, it will break the surface of the oil, causing another part of the gas to penetrate directly and be unable to combine with the oil. During the vortex process, due to the centrifugal force, this part of the gas cannot be well utilized. Therefore, when a certain amount of gas is introduced, the combination rate of gas and oil cannot be guaranteed, that is, the oil removal efficiency can be further improved.

[0007] Therefore, we propose an axial flow cyclone floating oil-water separation device and method to solve the above problems. Summary of the invention

[0008] The object of the present invention is to provide an axial flow cyclone floating oil-water separation device and method to solve the problems raised in the above background technology.

[0009] To achieve the above object, the present invention provides the following technical solutions: An axial flow cyclone floating oil-water separation device comprises a hollow shaft, a sealed bearing is installed at the bottom of the inner wall of the hollow shaft through a supporting fixing strip, a fixing column is installed in the inner ring of the sealed bearing, a hollow cylinder is fixedly installed on the opposite side of the two fixing columns, a rotary blade is integrally fixedly connected to the outer wall of the hollow cylinder, and an impact hole is opened on the surface of the rotary blade.

[0010] Preferably, the impact hole is a tapered hole, and the large-diameter end of the impact hole is designed to be tilted downward.

[0011] Preferably, a rotating shaft is docked and installed on the top of the fixed column at the upper position, and stirring blades are arranged on the outer wall of the rotating shaft.

[0012] Preferably, a sealing cover is threadedly installed on the top of the inner cavity of the hollow shaft, and an adjusting shaft is installed through the top of the sealing cover.

[0013] Preferably, a threaded structure is provided on the upper portion of the outer ring of the adjusting shaft, and a dirt collecting bucket is provided on the bottom of the outer ring of the adjusting shaft which is threadedly connected between the adjusting shaft and the sealing cover.

[0014] Preferably, the top and the bottom of the sewage collecting barrel are both conical structures, and a sewage discharge hole is opened at the bottom of the outer wall of the sewage collecting barrel, and the sewage discharge hole is designed to be inclined.

[0015] Preferably, the maximum diameter of the sewage collecting barrel is smaller than the inner diameter of the hollow shaft, and the diameter difference between the two is 0.5-1 cm, and the lower half of the sewage collecting barrel is hollow.

[0016] Preferably, a reflux cavity is provided at the bottom of the adjusting shaft, a reflux hole is provided on the outer wall of the reflux cavity located in the inner cavity of the dirt collecting bucket, and there is a height difference between the reflux hole located at the bottom layer and the bottom of the inner wall of the dirt collecting bucket.

[0017] Preferably, a drain pipe is installed through the outer edge of the top of the sealing cover, the adjustment shaft is located between the dirt collecting bucket and the sealing cover and is provided with a spring, and a limit stopper is provided at the bottom of the outer ring of the adjustment shaft.

[0018] An axial flow cyclone floating oil and water separation method comprises the following steps: Step 1: Installation of the equipment: connect the bottom of the oil-water separation equipment, i.e. the bottom port of the hollow shaft, with the drain port of the sewage storage equipment; 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 pump the gas through the sewage after a period of time and send it to the inner cavity of the hollow shaft; Step 3: Gas-oil secondary contact combination: based on step 2, after the mixed sewage and unreacted gas enter the inner cavity of the hollow shaft, the air and sewage are continuously shuttled between the rotating blades and impact holes, and then the gas and oil are in secondary contact in the inner cavity of the hollow shaft; Step 4: Oil-water separation: On the basis of step 3, after the combined sewage and gas-oil mixed sewage are moved upward, a vortex is formed by stirring the fan blades, and the outer wall of the sewage collection bucket contacts the inner layer of the vortex, allowing part of the sewage and oil to enter the sewage collection bucket for collection, thereby achieving separation of oil and water; Step 5, three-way contact and combination of gas and oil. On the basis of step 4, the sewage that enters the sewage collecting barrel together is impacted and refluxed into the vortex through the reflux hole and the reflux chamber. In the process of impact reflux, it continuously hits the vortex, allowing the gas to contact the sewage again, and then realize the third combination of oil and gas. After that, the action of step 4 is repeated. After multiple cycles, the oil and water are separated to the maximum extent.

[0019] Step 5, drainage. Based on steps 4 and 5, the water after oil and dirt separation continuously flows upward along the gap between the sewage collecting barrel and the hollow shaft, and is finally discharged from the drain pipe.

[0020] Compared with the prior art, the present invention has the following beneficial effects: The axial flow cyclone floating oil-water separation device, through the design of the swirl blades and the conical impact holes thereon, can allow the sewage, oil and gas that enter the inner cavity of the hollow shaft 1 together to come into contact again in small amounts and accurately during the initial swirl, thereby further improving the contact rate between the gas and the oil.

[0021] The axial flow cyclone floating oil-water separation device, through the design and use of the sewage collecting barrel, the adjusting shaft, the downward inclined sewage discharge hole, the sewage discharge hole and the stirring fan blade, when the mixed sewage that has been in contact with the gas is subjected to centrifugal stratification, the oil-pollution combination in the inner layer directly flows into the sewage collecting barrel for recovery, and when the oil-pollution combination is recovered, the excess sewage can be returned again, thereby realizing the separation of the oil-pollution combination from the sewage, effectively solving the problem that a large amount of oil-pollution and sewage are easily discharged simultaneously and need to be processed again when the oil-pollution combination is separated from the sewage by simple centrifugal force.

[0022] The axial flow cyclone floating oil-water separation device, through the design and use of the adjusting shaft and the reflux holes and reflux chamber thereon, can not only discharge the sewage in the collected oil-pollution mixed sewage again, leaving the oil-pollution mixture for collection and storage, but also, in the process of discharging excess sewage after removing the oil-pollution, allow this part of the sewage to directly hit the inner layer of the vortex-shaped mixed sewage again, thereby realizing the third contact between the gas and the oil-pollution, and further improving the efficiency of removing the oil-pollution from the sewage. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a cross-sectional view of the structure of the present invention; Figure 3 This is an exploded view of the structure of the rotary blade of the present invention; Figure 4 It is a cross-sectional view of the sewage collecting barrel of the present invention.

[0024] In the figure: 1. hollow shaft; 2. supporting fixing bar; 3. sealed bearing; 4. fixing column; 5. hollow cylinder; 6. rotary blade; 7. impact hole; 8. rotating shaft; 9. stirring blade; 10. sealing cover; 11. adjusting shaft; 12. sewage collecting barrel; 13. sewage discharge hole; 14. reflux chamber; 15. reflux hole; 16. limit baffle; 17. spring; 18. drain pipe. DETAILED DESCRIPTION

[0025] 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.

[0026] The present invention provides a technical solution for an axial flow cyclone floating oil-water separation device: Embodiment 1:

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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; When the space between every two rotating blades 6 is filled with mixed sewage, the mixed gas and sewage continuously flow between the rotating blades 6, which can also increase the contact between the gas and the oil and then combine them.

[0031] In the present technical solution, by designing the rotating blade 6 and the conical impact hole 7 thereon, during the initial rotation, the sewage, oil and gas that have entered the inner cavity of the hollow shaft 1 together can be brought into contact again in small amounts and accurately, thereby further improving the contact rate between the gas and the oil.

[0032] Embodiment 2:

[0033] like Figure 2and 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 fasteners, 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 rotating shaft 8 is docked and installed on the top of the fixing column 4 located on the upper layer, and a stirring fan blade 9 is arranged on the outer wall of the rotating shaft 8.

[0034] like Figure 1 and Figure 4 As shown, an adjusting shaft 11 is inserted into the upper part of the inner cavity of the hollow shaft 1, a dirt collecting bucket 12 is sleeved on the bottom of the outer ring of the adjusting shaft 11, and a drain hole 13 is arranged below the outer wall of the dirt collecting bucket 12.

[0035] The sewage collecting barrel 12 is a hollow barrel structure with conical upper and lower ends, and the sewage discharge hole 13 is opened on the outer wall of the sewage collecting barrel 12 in an inclined manner upward.

[0036] The diameter of the maximum outer diameter portion of the dirt collecting barrel 12 is smaller than the inner diameter of the hollow shaft 1, and the diameter difference between the two is controlled within a range of 0.5-1 cm.

[0037] Among them, Figure 4 As shown, a reflux chamber 14 is provided at the bottom of the adjusting shaft 11 , and a reflux hole 15 is provided on the outer wall of the reflux chamber 14 located in the inner cavity of the dirt collecting barrel 12 .

[0038] Among them, Figure 1 and Figure 2 As shown, a sealing cover 10 is threadedly installed at the top of the inner cavity of the hollow shaft 1, and a drain pipe 18 is installed through the outer edge of the sealing cover 10, and the bottom of the sealing cover 10 is a conical structure. The bottom of the drain pipe 18 is located just above the area between the sewage collecting bucket 12 and the inside of the hollow shaft 1, so that the sewage flowing up from the bottom continuously moves upward from the gap, changes the movement direction at the gap, and can directly move upward and be discharged from the drain pipe 18. In actual use, a hose or other pipe needs to be installed at the drain pipe 18 to collect the treated sewage.

[0039] Among them, Figure 2 As shown, a threaded structure is provided at the top of the outer wall of the adjusting shaft 11, a spring 17 is mounted 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 the design of the spring 17 is to fix the dirt collecting bucket 12 in the inner cavity of the hollow shaft 1 through the interaction force, and to maintain a certain stability when impacted by the mixed sewage, and the main function of the limit baffle 16 is to limit the limit position of the dirt collecting bucket 12 on the adjusting shaft 11.

[0040] In this embodiment, based on the first embodiment, after the preliminary vortex treatment of the mixed sewage, the gas has further contacted with the oil in the sewage and then combined with it, that is, the density difference between the water and the oil and gas mixture is increased. At this time, the stirring blade 9 will rotate, and the mixed sewage remaining between the sewage collecting bucket 12 and the stirring blade 9 will be stirred during the rotation, and then a vortex structure will be generated, that is, the oil-gas mixture and the sewage will be distinguished by the action of centrifugal force. At this time, the sewage collecting bucket 12 is just located at the center of the vortex, and the position of the sewage collecting bucket 12 is properly adjusted by adjusting the shaft 11, so that the outer surface of the sewage collecting bucket 12 can contact the mixed sewage, and when it contacts the mixed sewage At this time, due to the existence of centrifugal force, the gas-oil mixed sewage comes out of the inner layer, that is, it directly contacts the outer wall of the sewage collecting barrel 12. Since the mixed sewage moves upward as a whole, with the design and use of the downward inclined sewage hole 13, the gas-oil mixed sewage will carry a small amount of sewage from the sewage hole 13 into the inner cavity of the sewage collecting barrel 12 for storage, and the sewage entering the inner cavity of the sewage collecting barrel 12 will enter the reflux chamber 14 along the reflux hole 15, and finally be discharged from the bottom and return to the mixed sewage, and the refluxed sewage will directly hit the inner side of the vortex-shaped sewage mixture, and then carry the gas into the mixed sewage again, performing the third contact and combination action of gas and oil.

[0041] Among them, the reflux hole 15 at the bottom layer is a short distance away from the bottom of the inner wall of the sewage collecting barrel 12. In this way, in the inner cavity of the sewage collecting barrel 12, without any external interference, the oil-dirt combination always floats on the upper layer of the sewage. Even if there is sewage reflux, some water will remain, preventing the oil from returning to the sewage mixture again as the water is not completely removed.

[0042] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that 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: A sealed bearing (3) is installed at the bottom of the inner wall of the hollow shaft (1) via a supporting fixing strip (2); a fixing column (4) is installed in the inner ring of the sealed bearing (3); a hollow cylinder (5) is fixedly installed on the opposite side of the two fixing columns (4); a rotary blade (6) is integrally fixedly connected to the outer wall of the hollow cylinder (5); and an impact hole (7) is opened on the surface of the rotary blade (6).

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 rotating shaft (8) is butt-jointedly mounted on the top of the fixed column (4) at the upper layer, and stirring blades (9) are arranged on the outer wall of the rotating shaft (8).

4. The axial flow cyclone floating oil-water separation device according to claim 1, characterized in that: A sealing cover (10) is threadedly mounted on the top of the inner cavity of the hollow shaft (1), and an adjusting shaft (11) is penetratedly mounted on the top of the sealing cover (10).

5. The axial flow cyclone floating oil-water separation device according to claim 4, 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) and the sealing cover (10) are threadedly connected, and a dirt collecting bucket (12) is sleeved on the bottom of the outer ring of the adjusting shaft (11).

6. The axial flow cyclone floating oil-water separation device according to claim 5, characterized in that: The top and bottom of the sewage collecting bucket (12) are both conical structures, and a sewage discharge hole (13) is provided at the lower part of the outer wall of the sewage collecting bucket (12), and the sewage discharge hole (13) is designed to be inclined.

7. The axial flow cyclone floating oil-water separation device according to claim 5, characterized in that: The maximum diameter of the sewage 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 sewage collecting bucket (12) is in a hollow state.

8. The axial flow cyclone floating oil-water separation device according to claim 4, characterized in that: A reflux cavity (14) is provided at the bottom of the adjusting shaft (11), a reflux hole (15) is provided on the outer wall of the reflux cavity (14) located in the inner cavity of the dirt collecting bucket (12), and a height difference exists between the reflux hole (15) located at the bottom layer and the bottom of the inner wall of the dirt collecting bucket (12).

9. The axial flow cyclone floating oil-water separation device according to claim 4, characterized in that: A drainage pipe (18) is installed through the outer edge of the top of the sealing cover (10); the adjustment shaft (11) is located between the dirt collecting bucket (12) and the sealing cover (10) and is sleeved with a spring (17); and a limit stopper (16) is provided at the bottom of the outer ring of the adjustment shaft (11).

10. An axial flow cyclone floating oil and water separation method, characterized in that: The following steps are involved: Step 1: installing the equipment, connecting the bottom of the oil-water separation equipment, i.e. the bottom port of the hollow shaft (1), with the drain port of the sewage storage equipment; 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 pump the gas through the sewage after a period of time 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 rotary blades (6) and impact holes (7) through the action of the rotary blades (6) and impact holes (7), 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 are moved upward after the secondary foundation, a vortex is formed by stirring the fan blades (9). The outer wall of the sewage collecting bucket (12) contacts the inner layer of the vortex, allowing part of the sewage and oil to enter the sewage collecting bucket (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 5: Drainage. Based on steps 4 and 5, the water after 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 drain pipe (18).

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