Oil-water separation equipment and separation process thereof

Abstract

The invention relates to the technical field of oil-water separation, and discloses oil-water separation equipment which comprises a pool body, an annular discharging groove and a water outlet are formed in the inner side wall of the pool body, a separation baffle is installed on the inner wall of the annular discharging groove through an extending frame, and an oil collecting channel is further installed on the inner wall of the separation baffle. The lower end of the oil collecting channel is communicated with an oil outlet pipe; the tank body is provided with a feeding cylinder and a sludge discharging pipe, a pushing scraping plate is mounted on the outer side wall of the feeding cylinder through a rotating frame, the lower end of the feeding cylinder is communicated with a feeding pipe, and a feeding port is formed in the outer side wall of the feeding cylinder; the invention further discloses an oil-water separation process which comprises the following steps: S1, sewage introduction and pretreatment; s2, primary separation; s3, fine separation; s4, collecting and discharging oil liquid; and S5, water discharging: a multi-stage separation structure is adopted, the separation efficiency is greatly improved through multi-stage cooperation, a good separation effect on oil drops with small particle sizes is achieved, and the environment-friendly discharge requirement is met.

Description

Technical Field

[0001] The present invention relates to the technical field of oil-water separation, and particularly to an oil-water separation device and its separation process. Background Art

[0002] In the production and operation processes of industries such as petrochemical, food processing, ship transportation, and catering, a large amount of oily wastewater is generated. If directly discharged without effective treatment, it will not only cause serious pollution to ecological environments such as soil and water bodies, leading to problems such as the destruction of the water ecosystem, but also result in waste of water resources, going against the concept of sustainable development. Therefore, efficient oil-water separation technology has become the focus of the industry.

[0003] Currently, common oil-water separation devices and technologies mainly include gravity separation, flotation separation, filtration separation, and membrane separation, etc. Gravity separation relies on the density difference between oil and water to achieve separation. Although this method is simple to operate and has a low cost, its separation efficiency is low, the treatment time is long, and the separation effect on tiny oil droplets is not good, making it difficult to meet the increasingly strict environmental emission requirements; flotation separation generates tiny bubbles by introducing gas into the wastewater, causing the oil droplets to attach to the bubbles and float for separation. However, traditional flotation devices are prone to causing significant disturbances in the precipitation area during the aeration process, resulting in the re-suspension of the precipitated sludge and affecting the separation effect, and also having high energy consumption; filtration separation uses a filtration medium to intercept oil droplets, but the filtration medium is prone to clogging and needs to be frequently replaced, with a high operating cost; membrane separation has a high separation accuracy, but the membrane module is expensive and is easily contaminated by impurities in the wastewater, with a high maintenance difficulty.

[0004] An oil-water separation device for treating oily sludge and its usage method with the Chinese patent application number CN202310147462.5 can achieve the full separation of oil and water in oily sludge. However, when separating the oil and water in oily sludge through a filter screen, the oily sludge easily enters the mesh holes of the filter screen, resulting in mesh clogging and affecting subsequent oil-water separation.

[0005] Therefore, it is necessary to provide an oil-water separation device and its separation process to solve the above technical problems. Summary of the Invention

[0006] The purpose of the present invention is to provide an oil-water separation device and its separation process to solve the existing problems in the above background art.

[0007] To achieve the above purpose, the present invention provides the following technical solutions:

[0008] An oil-water separation device, comprising a pool body, wherein an annular discharge groove and a water outlet are provided on the inner side wall of the pool body, and the water outlet is communicated with the annular discharge groove. A partition baffle is installed on the inner wall of the annular discharge groove through an extension bracket. An oil collection channel is further installed on the inner wall of the partition baffle, and an oil discharge pipe is connected to the lower end of the oil collection channel;

[0009] A conical groove is provided at the lower end of the pool body. A feed cylinder is provided at the center of the conical groove. A pushing scraper is installed on the outer side wall of the feed cylinder through a rotating bracket. A feed pipe is connected to the lower end of the feed cylinder. A feed inlet is provided on the outer side wall of the feed cylinder. A sludge discharge pipe is connected to the side wall of the conical groove. A motor and a sludge pump are installed on the inner side wall of the pool body through a mounting bracket. The output shafts of the motor and the sludge pump are connected to the upper end of the feed cylinder. A buffer cylinder is installed on the outer side wall of the feed cylinder. An isolation cylinder is provided outside the buffer cylinder. An annular oil collection bracket is provided on the isolation cylinder, and the annular oil collection bracket is communicated with the oil collection channel. An oil-water separation bracket is jointly installed between the buffer cylinder and the annular oil collection bracket.

[0010] As a further scheme of the present invention, a resisting ring is installed on the outer side wall of the buffer cylinder, and the oil-water separation bracket is erected on the resisting ring and the annular oil collection bracket. The oil-water separation bracket includes a lower connecting ring, and the lower connecting ring is located on the resisting ring. A plurality of wave-shaped inclined oil guide plates are circumferentially arranged on the lower connecting ring, and the wave-shaped inclined oil guide plates are arranged at a certain inclination angle with the horizontal direction. The wave-shaped inclined oil guide plates are made of oil-loving and water-repellent polypropylene material, which can better adsorb oil droplets. A clamping plate is provided on the lower end surface of the end of the wave-shaped inclined oil guide plate far away from the lower connecting ring, and the clamping plate is clamped on the annular oil collection bracket. There is a gap between two adjacent wave-shaped inclined oil guide plates.

[0011] As a further scheme of the present invention, an annular oil collection groove is provided on the upper end surface of the annular oil collection bracket, and the annular oil collection groove is arranged at a certain inclination angle with the horizontal direction. Through holes are provided on the annular oil collection bracket to realize the connection between the annular oil collection groove and the oil collection channel, and the connection between the annular oil collection groove and the oil collection channel is the lowest point of the annular oil collection groove.

[0012] As a further scheme of the present invention, an overflow weir is installed on the inner wall of the annular discharge groove, and the partition baffle is located inside the overflow weir, and the plane where the upper end surface of the partition baffle is located is higher than the plane where the highest point of the overflow weir is located.

[0013] As a further scheme of the present invention, a plurality of feed ports are arranged on the side wall of the buffer cylinder through a plurality of guide plates, and the guide plates are arranged at a certain inclination angle with the section passing through the center line of the buffer cylinder.

[0014] As a further solution of the present invention, the rotating frame is provided with an oil scraping plate through a telescopic component, and the oil scraping plate abuts against the inner wall of the annular oil collecting groove. The telescopic component includes a plurality of sleeve frames sleeved in sequence, and adjacent sleeve frames are connected by connecting springs, and the oil scraping plate is fixedly connected to the lower end of the lowermost sleeve frame.

[0015] As a further solution of the present invention, an air diffuser pipe component is provided in the pool body. The air diffuser pipe component includes an air diffuser main pipe, one end of the air diffuser main pipe is connected with an annular air diffuser pipe, and the annular air diffuser pipe is located in the pool body. An air diffuser extension pipe is communicated with the annular air diffuser pipe. The air diffuser extension pipe sequentially penetrates through the pool body and the partition baffle and extends into the partition baffle. An air diffuser branch pipe is provided in the circumferential direction of the air diffuser extension pipe, and the air diffuser branch pipe is located between the partition baffle and the isolation cylinder.

[0016] An oil-water separation process includes the following steps:

[0017] S1. Sewage introduction and pretreatment: The sewage is transported to the feed cylinder through the feed pipe, the motor drives the feed cylinder to rotate, and the sewage is thrown out from the feed port by centrifugal force. Based on the height difference between the feed port and the feed port of the buffer cylinder, the sewage flows into the buffer cylinder. During this process, large-particle impurities sink to the bottom conical groove of the pool body under the action of gravity, and the sludge scraping plate rotates with the buffer cylinder to scrape the impurities to the sludge discharge pipe for discharge.

[0018] S2. Preliminary separation: The sewage flows along the inclined guide plate in the buffer cylinder. The inclination angle of the guide plate prolongs the residence time of the sewage and promotes its spiral upward movement, promoting the preliminary separation of oil droplets and water.

[0019] S3. Fine separation: The oil liquid after preliminary separation rises to the oil-water separation frame between the buffer cylinder and the annular oil collecting frame. The oleophilic and hydrophobic wavy inclined oil guide plate guides the oil droplets to flow along the plate surface and gather, and the water falls back from the gap between adjacent guide plates, realizing the fine separation of oil and water.

[0020] S4. Oil liquid collection and discharge: The oil liquid after fine separation enters the annular oil collecting groove of the annular oil collecting frame, flows along the groove under the action of gravity, enters the oil collecting channel through the through hole, and is finally discharged through the oil discharge pipe; meanwhile, the pushing scraper pushes the residual oil liquid between the annular oil collecting frame and the partition baffle to the oil collecting channel.

[0021] S5. Discharge of water: The separated water crosses the overflow weir on the inner wall of the annular discharge groove, enters the annular discharge groove, and is discharged from the water outlet. The partition baffle prevents the oil liquid from mixing in.

[0022] The present invention utilizes a multi-stage separation structure, including a buffer cylinder, an oil-water separator, and an annular oil collecting rack. The buffer cylinder achieves preliminary oil-water separation; the wave-shaped, inclined oil guide plate of the oil-water separator increases the contact area between the oil and the guide plate, achieving fine oil-water separation; and the inclined annular oil collecting trough of the annular oil collecting rack utilizes gravity to efficiently collect oil. This multi-stage synergy significantly improves separation efficiency, even effectively separating tiny oil droplets, meeting strict environmental emission requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is a schematic structural diagram of the tank body after being cut open in the present invention;

[0026] Figure 3 It is a schematic structural diagram of the tank body, overflow weir and separation baffle after being cut apart in the present invention;

[0027] Figure 4 This is a schematic diagram of the structure of the present invention after removing the tank body and its connected pipes, overflow weir, separation baffle, and aeration pipe assembly;

[0028] Figure 5 In the present invention Figure 4 Schematic diagram of the structure after removing the connecting frame, scraper, motor and sludge pump;

[0029] Figure 6 In the present invention Figure 5 Schematic diagram of the structure after removing the isolation cylinder, oil-water separation frame and buffer cylinder;

[0030] Figure 7 This is a structural diagram of the connection state of the annular oil collecting rack and the oil collecting channel in the present invention;

[0031] Figure 8 In the present invention Figure 5 Schematic diagram of the structure after removing the isolation cylinder, oil-water separation frame, oil collection channel and annular oil collection frame;

[0032] Figure 9 This is a structural diagram of the connection state of the buffer cylinder and the oil-water separation frame in the present invention;

[0033] Figure 10 It is a structural schematic diagram of the oil-water separation frame of the present invention;

[0034] Figure 11 It is a structural schematic diagram of the aeration tube assembly in the present invention.

[0035] In the figure: 1. Pool body; 2. Feed cylinder; 3. Feed pipe; 4. Sludge discharge pipe; 5. Aeration pipe assembly; 501. Main aeration pipe; 502. Annular aeration pipe; 503. Aeration extension pipe; 504. Aeration branch pipe; 6. Buffer cylinder; 7. Guide plate; 8. Connecting frame; 9. Scraper; 10. Rotating frame; 11. Pushing scraper; 12. Overflow weir; 13. Annular discharge chute; 14. Outlet; 15. Partition baffle; 16. Oil collecting channel; 17. Oil discharge pipe; 18. Inlet; 19. Isolation cylinder; 20. Oil-water separation frame; 2001. Lower connecting ring; 2002. Wave-shaped inclined oil guide plate; 21. Annular oil collecting frame; 22. Annular oil collecting groove; 23. Oil scraper. Detailed implementation manners

[0036] Embodiment 1

[0037] As Figures 1 - 10 shown, an oil-water separation device includes a pool body 1. An annular discharge chute 13 and an outlet 14 are provided on the inner side wall of the pool body 1, and the outlet 14 is communicated with the annular discharge chute 13. An overflow weir 12 is installed on the inner wall of the annular discharge chute 13. A partition baffle 15 is installed on the inner wall of the annular discharge chute 13 through an extension frame, and the partition baffle 15 is located within the overflow weir 12. The height of the partition baffle 15 is higher than the height of the overflow weir 12. The plane where the upper end surface of the partition baffle 15 is located is higher than the plane where the highest point of the overflow weir 12 is located, effectively preventing oil from flowing into the annular discharge chute 13 along with the water flow and ensuring the water quality of the discharged water.

[0038] The lower end of the pool body 1 is provided with a conical groove. At the center of the conical groove, a feed cylinder 2 is installed through a bearing. The lower end of the feed cylinder 2 is connected to a feed pipe 3. A material inlet 18 is opened on the outer side wall of the feed cylinder 2. A sludge discharge pipe 4 is connected to the side wall of the conical groove. On the inner side wall of the pool body 1, a motor and a sludge pump are installed through a mounting frame. The output ends of the motor and the sludge pump are both connected to the upper end of the feed cylinder 2. A buffer cylinder 6 is installed on the outer side wall of the feed cylinder 2. Through a number of guide plates 7 arranged on the side wall of the buffer cylinder 6, a number of material guide openings are formed. And the guide plates 7 are inclined. The angle between the plane where the diameter of each cross-section of the buffer cylinder 6 is located and the side wall of the guide plate 7 is within the range of 30° to 70°, which can extend the residence time of sewage in the buffer cylinder 6, promote the preliminary separation of oil and water, and at the same time make the sewage flow in a spiral upward manner, increasing the chance of oil droplet collision and coalescence. The inclination angle of the guide plate 7 can be adjusted according to factors such as the oil content of sewage and the particle size of oil droplets. The height of the material inlet 18 is lower than the height of the material guide opening. The material inlet 18 is lower than the material guide opening of the buffer cylinder 6. Using the height difference, the sewage naturally flows into the buffer cylinder 6, reducing energy loss. At the lower end of the buffer cylinder 6, a sludge scraping plate 9 is arranged through a connecting frame 8. The connecting frame 8 is divided into a vertical part and a horizontal part. The vertical part and the horizontal part form an inverted "T" shape. The vertical part is located in the middle of the horizontal part. The feed cylinder 2 is located in the vertical part. Two symmetrically arranged sludge scraping plates 9 are symmetrically arranged on the horizontal part. And the lower end of the sludge scraping plate 9 contacts the bottom wall of the pool body 1. The lower end of the partition baffle 15 is located above the horizontal part of the connecting frame 8 to avoid affecting the rotation of the connecting frame 8.

[0039] On the inner wall of the partition baffle 15, an oil collection channel 16 is also installed. On one side wall of the oil collection channel 16, an inclined guide plate is fixedly connected. The upper end surface of the inclined guide plate is flush with the upper end surface of the oil collection channel 16. The lower end of the oil collection channel 16 is connected to an oil outlet pipe 17. And the oil outlet pipe 17 penetrates through the pool body 1 and extends outward.

[0040] An isolation cylinder 19 is arranged outside the buffer cylinder 6. And the isolation cylinder 19 is fixedly connected to the oil collection channel 16. The plane where the upper end surface of the isolation cylinder 19 is located is higher than the plane where the upper end surface of the buffer cylinder 6 is located. An annular oil collection rack 21 is arranged on the isolation cylinder 19. The annular oil collection rack 21 is arranged on the outer side wall of the isolation cylinder 19. And the annular oil collection rack 21 is higher than the isolation cylinder 19. An annular oil collection groove 22 is opened on the upper end surface of the annular oil collection rack 21. And the annular oil collection groove 22 is arranged at a certain inclination angle with the horizontal direction. Through holes are opened on the annular oil collection rack 21 to realize the connection between the annular oil collection groove 22 and the oil collection channel 16. And the connection part between the annular oil collection groove 22 and the oil collection channel 16 is the lowest part of the annular oil collection groove 22. Using the gravity effect, the oil liquid automatically flows to the oil collection channel 16 without additional power, which is convenient for collecting and guiding the oil liquid to flow to the oil outlet pipe 17.

[0041] An oil-water separation rack 20 is jointly installed between the buffer cylinder 6 and the annular oil collecting rack 21. An abutting ring is installed on the outer side wall of the buffer cylinder 6, and the oil-water separation rack 20 is erected on the abutting ring and the annular oil collecting rack 21. The oil-water separation rack 20 includes a lower connecting ring 2001, and the lower connecting ring 2001 is located on the abutting ring. A number of wavy inclined oil guide plates 2002 are circumferentially arranged on the lower connecting ring 2001. The wavy inclined oil guide plates 2002 are arranged at a certain inclination angle with respect to the horizontal direction. When the oil droplets in the sewage flow through the corrugated plate along with the water flow, due to their own buoyancy and the inclined guidance of the wavy inclined oil guide plates 2002, they will adhere to the surface of the wavy inclined oil guide plates 2002 and flow upward along the corrugated plate, realizing fine oil-water separation. The wavy design increases the contact area between the oil liquid and the wavy inclined oil guide plates 2002 and improves the separation efficiency; the wavy inclined oil guide plates 2002 are made of oil-loving and water-repellent polypropylene material, which can better adsorb oil droplets. A clamping plate is provided on the lower end surface of the end of the wavy inclined oil guide plate 2002 far from the lower connecting ring 2001, and the clamping plate is clamped on the annular oil collecting rack 21. There is a gap between two adjacent wavy inclined oil guide plates 2002. The setting of the gap between adjacent wavy inclined oil guide plates 2002 ensures the smooth flow of water, avoids blockage, and at the same time prevents the oil liquid from flowing away with the water; the setting of the clamping plate and the lower connecting ring 2001 facilitates the disassembly of the oil-water separation rack 20 and is convenient for replacing or cleaning the oil-water separation rack 20.

[0042] A pushing scraper 11 is installed on the outer side wall of the feed cylinder 2 through a rotating frame 10, and the length of the pushing scraper 11 is smaller than the length of the oil collecting channel 16. The rotating frame 10 can be set in multiple groups. Each group of rotating frames 10 includes an arc-shaped frame, and the arc-shaped frame is arranged on the outer side of the feed cylinder 2. Adjacent two arc-shaped frames are connected by locking screws. An installation frame is fixedly connected to the arc-shaped frame. The pushing scraper 11 is arranged at the lower end of the installation frame, and the pushing scraper 11 is located between the annular oil collecting rack 21 and the partition baffle 15.

[0043] The sewage flows into the feed cylinder 2 through the feed pipe 3, and the motor installed on the mounting frame on the inner side wall of the pool body 1 drives the feed cylinder 2 to rotate. Under the action of centrifugal force, the sewage is thrown out from the feed port 18 on the outer side wall of the feed cylinder 2. Since the height of the feed port 18 is lower than the feed port formed by the guide plate 7 on the side wall of the buffer cylinder 6, the sewage smoothly enters the buffer cylinder 6. At this time, the large-particle impurities in the sewage settle to the conical groove at the bottom of the pool body 1 due to gravity, and the oil droplets with smaller density begin to float upward. The connecting frame 8 at the lower end of the buffer cylinder 6 drives the sludge scraper 9 to rotate, and the sludge settled at the bottom of the pool body 1 is scraped to the sludge discharge pipe 4 for discharge.

[0044] The material guide plate 7 on the side wall of the buffer cylinder 6 is inclined. When the sewage flows in the buffer cylinder 6, it is guided by the material guide plate 7, and the path is extended, increasing the residence time, which promotes the further separation of oil droplets and water. After preliminary separation in the buffer cylinder 6, the floating oil liquid continues to rise and crosses the top of the buffer cylinder 6. At this time, the oil liquid first contacts the oil-water separation rack 20 between the buffer cylinder 6 and the annular oil collection rack 21. The lower connecting ring 2001 of the oil-water separation rack 20 is erected on the abutting ring on the outer side wall of the buffer cylinder 6, and the circumferentially arranged wavy inclined oil guide plates 2002 play a key role. The oil-loving and water-repellent wavy inclined oil guide plates 2002 guide the oil liquid to flow along the plate surface, and the fine oil droplets coalesce on the plate surface and move upward; while the water falls downward through the gaps between adjacent wavy inclined oil guide plates 2002 due to the action of gravity, realizing the fine separation of oil and water.

[0045] The oil liquid separated by the oil-water separation rack 20 continues to rise along the wavy inclined oil guide plate 2002 and reaches the annular oil collection rack 21 outside the isolation cylinder 19. The annular oil collection groove 22 on the upper end surface of the annular oil collection rack 21 is inclined. The oil liquid flows along the annular oil collection groove 22 under the action of gravity, flows into the oil collection channel 16 through the through holes on the annular oil collection rack 21, and finally is discharged from the equipment through the oil outlet pipe 17.

[0046] The pushing scraper 11 installed on the outer side wall of the feeding cylinder 2 through the rotating frame 10 pushes the residual oil liquid between the annular oil collection rack 21 and the partition baffle 15 into the oil collection channel 16 when the feeding cylinder 2 rotates, avoiding the influence of oil liquid residue on the separation effect. The water after the oil-water separation crosses the overflow weir 12 on the inner wall of the annular discharge groove 13, enters the annular discharge groove 13, and finally is discharged from the water outlet 14. Since the height of the partition baffle 15 is higher than that of the overflow weir 12, it effectively blocks the oil liquid from entering the annular discharge groove 13, ensuring that the water quality of the discharged water meets the requirements.

[0047] Embodiment 2

[0048] On the basis of Embodiment 1, as Figures 2 - 4 、 Figure 8 and Figure 11 shown, an oil scraping plate 23 is installed on the mounting rack through a telescopic component, and the oil scraping plate 23 abuts against the inner wall of the annular oil collection groove 22. The telescopic component includes a plurality of nested sleeve racks in sequence, and adjacent sleeve racks are connected by connecting springs. The oil scraping plate 23 is fixedly connected to the lower end of the lowermost sleeve rack.

[0049] The oil scraping plate 23 is installed on the mounting frame through a telescopic component composed of multiple sleeved frames and connecting springs arranged in sequence. When the annular oil collecting groove 22 on the annular oil collecting frame 21 collects oil liquid, the oil scraping plate 23 is always tightly pressed against the inner wall of the annular oil collecting groove 22 under the elastic action of the connecting spring. Even if there are minor dimensional errors in the manufacturing and installation processes of the annular oil collecting frame 21, or position offsets occur due to vibration during equipment operation, the telescopic characteristics of the connecting spring can ensure that the oil scraping plate 23 adaptively fits the groove wall. As the feeding cylinder 2 rotates, it drives the mounting frame and the oil scraping plate 23 to rotate around the center of the tank body 1. During the rotation of the oil scraping plate 23, the oil liquid attached to the inner wall of the annular oil collecting groove 22 is scraped off to avoid oil liquid residue. The scraped-off oil liquid flows along the plate surface of the oil scraping plate 23 and flows to the bottom of the annular oil collecting groove 22 under the action of gravity, converges with other oil liquid in the groove, enters the oil collecting channel 16 through the through hole, and finally is discharged through the oil outlet pipe 17, improving the oil liquid collection efficiency.

[0050] An aeration pipe assembly 5 is provided in the tank body 1. The aeration pipe assembly 5 includes an aeration main pipe 501. One end of the aeration main pipe 501 is connected with an annular aeration pipe 502, and the annular aeration pipe 502 is located in the tank body 1. A number of aeration extension pipes 503 are symmetrically communicated with the annular aeration pipe 502. The aeration extension pipes 503 sequentially penetrate through the tank body 1 and the partition baffle 15 and extend into the partition baffle 15. Aeration branch pipes 504 are provided circumferentially on the aeration extension pipes 503, and the aeration branch pipes 504 are located between the partition baffle 15 and the isolation cylinder 19. The upper ends of the aeration branch pipes 504 are close to the horizontal area to reduce the impact on the bottom sludge. Micro-pore aeration heads are installed at the ends of the aeration branch pipes 504. By controlling the pore size and distribution density, the bubble diameter is accurately adjusted. Small-diameter bubbles can improve the air flotation efficiency while reducing the water flow disturbance intensity.

[0051] The annular aeration pipe 502 is divided into multiple independent gas path partitions. Each partition corresponds to a section of the aeration extension pipe 503 and its branch pipes 504. The gas on / off of each partition is controlled separately through solenoid valves or pneumatic valves to achieve local aeration. For example, the partition in the area close to the feeding cylinder 2 is preferentially aerated to strengthen the air flotation separation when the sewage just enters the tank body, while the partition near the precipitation area reduces aeration or adopts a weak aeration mode to avoid disturbing the deposited sludge.

[0052] A staged aeration program is formulated, and an operation cycle is divided into multiple stages. At the initial stage of water inlet, all aeration partitions are opened to quickly promote the floating of oil droplets attached to bubbles with a strong air flow rate; during the intermediate precipitation stage, only the partitions in the area close to the water surface are intermittently aerated to maintain slight disturbance on the water surface to prevent the oil layer from crusting; during the drainage stage, partial aeration is started again to push the residual oil droplets and suspended substances to the oil collecting area, and at the same time help loosen the sludge for the sludge scraping plate 9 to clean.

[0053] An oil-water separation process includes the following steps:

[0054] S1. Sewage introduction and pretreatment: The sewage is transported to the feed cylinder 2 through the feed pipe 3. The motor drives the feed cylinder 2 to rotate, and the centrifugal force is used to make the sewage flow out from the feed inlet 18. Based on the height difference between the feed inlet 18 and the material guiding port of the buffer cylinder 6, the sewage flows into the buffer cylinder 6. During this process, large-particle impurities sink to the bottom conical groove of the tank body 1 under the action of gravity. The sludge scraping plate 9 rotates with the buffer cylinder 6 and scrapes the impurities to be discharged through the sludge discharge pipe 4.

[0055] S2. Preliminary separation: The sewage flows along the inclined material guiding plate 7 in the buffer cylinder 6. The inclination angle of the material guiding plate 7 prolongs the residence time of the sewage and promotes its spiral upward movement, promoting the preliminary separation of oil droplets and water.

[0056] S3. Fine separation: The oil liquid after preliminary separation rises to the oil-water separation rack 20 between the buffer cylinder 6 and the annular oil collection rack 21. The oleophilic and hydrophobic wavy inclined oil guiding plates 2002 guide the oil droplets to flow along the plate surface and gather, and the water falls back from the gap between adjacent oil guiding plates, realizing the fine separation of oil and water.

[0057] S4. Oil liquid collection and discharge: The oil liquid after fine separation enters the annular oil collection groove 22 of the annular oil collection rack 21, flows along the groove under the action of gravity, enters the oil collection channel 16 through the through hole, and is finally discharged through the oil discharge pipe 17; at the same time, the pushing scraping plate 11 pushes the residual oil liquid between the annular oil collection rack 21 and the partition baffle 15 towards the oil collection channel 16.

[0058] S5. Discharge of water: The separated water crosses the overflow weir 12 on the inner wall of the annular discharge groove 13, enters the annular discharge groove 13, and is discharged from the water outlet 14. The partition baffle 15 prevents the oil liquid from mixing in.

[0059] In step S4, the oil scraping plate 23 connected by the telescopic component closely adheres to the inner wall of the annular oil collection groove 22 under the action of the connecting spring and rotates with the feed cylinder ② to scrape the oil liquid on the groove wall, improving the collection efficiency.

Claims

1. An oil-water separation device, comprising a tank body, characterized in that: An annular discharge trough and a water outlet are provided on the inner side wall of the tank body. A partition baffle is installed on the inner wall of the annular discharge trough through an extension frame. An oil collecting channel is also installed on the inner wall of the partition baffle. The lower end of the oil collecting channel is connected to an oil outlet pipe. The pool body is provided with a feed barrel and a sludge discharge pipe, a pushing scraper is installed on the outer wall of the feed barrel through a rotating frame, the lower end of the feed barrel is connected with the feed pipe, and an inlet is provided on the outer wall of the feed barrel, and a motor and a sludge pump are installed on the inner wall of the pool body through a mounting frame, the output shafts of the motor and the sludge pump are connected to the upper end of the feed barrel, a buffer barrel is installed on the outer wall of the feed barrel, an isolation barrel is provided outside the buffer barrel, an annular oil collecting rack is provided on the isolation barrel, and an oil-water separation rack is installed between the buffer barrel and the annular oil collecting rack.

2. The oil-water separation device according to claim 1, characterized in that: A support ring is installed on the outer side wall of the buffer cylinder, and the oil-water separation frame is mounted on the support ring and the annular oil collecting frame. The oil-water separation frame includes a lower connecting ring, and the lower connecting ring is located on the support ring. A plurality of wave-inclined oil guide plates are circumferentially arranged on the lower connecting ring. A clamping plate is provided on the lower end surface of the wave-inclined oil guide plate away from the lower connecting ring, and the clamping plate is clamped on the annular oil collecting frame. There is a gap between two adjacent wave-inclined oil guide plates.

3. The oil-water separation device according to claim 1, characterized in that: An annular oil collecting groove is provided on the upper end surface of the annular oil collecting rack, and a through hole is provided on the annular oil collecting rack to realize the communication between the annular oil collecting groove and the oil collecting channel.

4. The oil-water separation device according to claim 3, characterized in that: An overflow weir is installed on the inner wall of the annular discharge trough, and a partition baffle is located inside the overflow weir, and a plane where the upper end surface of the partition baffle is located is higher than a plane where the highest point of the overflow weir is located.

5. The oil-water separation device according to claim 1, characterized in that: A plurality of material guide ports are arranged on the side wall of the buffer cylinder through a plurality of material guide plates, and the material guide plates are arranged at a certain inclination angle to the section passing through the center line of the buffer cylinder.

6. The oil-water separation device according to claim 3, characterized in that: The rotating frame is equipped with an oil scraper through a telescopic assembly, and the oil scraper is against the inner wall of the annular oil collecting trough. The telescopic assembly includes a plurality of sleeves arranged in sequence, and adjacent sleeves are connected by connecting springs, and the oil scraper is fixedly connected to the lower end of the lowest sleeve.

7. The oil-water separation device according to claim 1, characterized in that: An aeration pipe assembly is provided in the pool body, and the aeration pipe assembly includes an aeration main pipe, one end of which is connected to an annular aeration pipe, and the annular aeration pipe is located in the pool body. The annular aeration pipe is connected to an aeration extension pipe, and the aeration extension pipe sequentially passes through the pool body and the partition baffle and extends into the partition baffle. The aeration extension pipe is circumferentially provided with an aeration branch pipe, and the aeration branch pipe is located between the partition baffle and the isolation cylinder.

8. An oil-water separation process using an oil-water separation device according to any one of 1 to 7, characterized in that: The following steps are involved: S1. Sewage introduction and pretreatment: Sewage is transported to the feed drum through the feed pipe. The motor drives the feed drum to rotate, and the centrifugal force is used to throw the sewage out from the inlet and flow into the buffer drum. Large particles of impurities settle to the conical groove at the bottom of the tank under the action of gravity. The scraper rotates with the buffer drum and scrapes the impurities to the sludge discharge pipe for discharge; S2. Preliminary separation: The sewage rises in the buffer cylinder, and the oil droplets and water are initially separated; S3, fine separation: the oil after preliminary separation rises to the oil-water separation frame between the buffer cylinder and the annular oil collecting frame to achieve fine separation of oil and water; S4. Oil collection and discharge: The finely separated oil enters the annular oil collecting rack and enters the oil collecting channel through the through hole, and is finally discharged through the oil outlet pipe; S5. Water discharge: The separated water enters the annular discharge trough and is discharged from the water outlet. The separation baffle prevents oil from mixing in.

Images