Marine oil-water separation device for treating oily wastewater

Abstract

The invention discloses a marine oil-water separation device for treating oily wastewater, and relates to the field of sewage treatment.The marine oil-water separation device comprises a vertical flow type air flotation machine, the vertical flow type air flotation machine comprises an air flotation container, and a vertical inner barrel and a filtering filler assembly are arranged in the air flotation container; the filter filler assembly is positioned in an annular space between the vertical inner cylinder and the air flotation container, and comprises a water-permeable partition plate and a filler layer positioned on the water-permeable partition plate; a back flushing pipe and a flushing blow-off pipe are arranged on the peripheral wall of the air floatation container, the connecting position between the back flushing pipe and the air floatation container partially coincides with the bottom boundary of the filler layer along the vertical direction, and the connecting position of the flushing blow-off pipe in the air floatation container partially coincides with the top boundary of the filler layer; and the flushing blow-off pipe is provided with a blow-off pump. According to the invention, the flushing and cleaning effect on the filler layer can be improved.

Description

Technical Field

[0001] This application relates to the field of sewage treatment technology, and particularly to an oil-water separation device for treating oily wastewater on ships. Background Art

[0002] The exhaust gas passage generated by ship engines needs to be treated by washing. The wastewater after washing contains a large amount of oil and grease, which needs to be separated by oil-water separation before being discharged into the sea. The vertical flow air flotation machine is an important device in the process of oil-water separation. The vertical flow air flotation machine combines a dissolved air tank to separate the oil in the water by the pressurized dissolved air flotation method.

[0003] A filter packing is provided inside the vertical flow air flotation machine. The filter packing is used to prevent the separated suspended oil droplets from being discharged outwards along with the separated water. The filter packing inside the vertical flow air flotation machine needs to be regularly backwashed and cleaned to maintain its filtering ability. The flow direction of the backwash of the filter packing is opposite to the direction of the sewage passing through the filter packing. When the backwash water reaches the front end of the filter packing, due to the resistance of the filter packing, the water pressure drops significantly, which limits the backwash effect of the filter packing, and thus limits the backwash regeneration effect of the filter packing. Summary of the Invention

[0004] In order to improve the backwash effect of the filter packing inside the vertical flow air flotation machine, this application provides an oil-water separation device for treating oily wastewater on ships.

[0005] An oil-water separation device for treating oily wastewater on ships provided by this application adopts the following technical solutions: An oil-water separation device for treating oily wastewater on ships includes a vertical flow air flotation machine. The vertical flow air flotation machine includes an air flotation container. A vertical inner cylinder and a filter packing assembly are provided inside the air flotation container. The filter packing assembly is located in the annular space between the vertical inner cylinder and the air flotation container. The filter packing assembly includes a permeable partition plate and a packing layer located on the permeable partition plate. The peripheral wall of the air flotation container is provided with a backwash pipe and a flushing and sewage discharge pipe. The connection position between the backwash pipe and the air flotation container vertically partially coincides with the bottom boundary of the packing layer. The connection position of the flushing and sewage discharge pipe on the air flotation container partially coincides with the top boundary of the packing layer. A sewage pump is provided on the flushing and sewage discharge pipe.

[0006] By adopting the above technical solution, the sewage in the vertical flow flotation machine passes through the filter packing assembly from top to bottom, and the packing layer of the filter packing assembly filters the suspended dirt in the sewage. When the packing layer needs to be rinsed after long-term use, first discharge the suspended dirt in the flotation container, then pump clear water into the flotation container through the backwash pipe, and at the same time turn on the sewage pump to suck the backwash sewage in the flotation container by the sewage pump, so that the sewage pump sucks the sewage in the flotation container at a speed close to the flushing speed of the backwash pipe. Since the position where the flushing sewage pipe is connected to the flotation container is close to the top boundary of the packing layer, and the sewage pump sucks the sewage in the flotation container, it can accelerate the drainage speed in the flotation container, so that the top boundary of the packing layer is washed by the water flow at a faster speed, which is beneficial to improving the flushing and cleaning effect of the packing layer. Since the backwash pipe is close to the bottom boundary of the packing layer, the backwash water can directly rinse the packing layer as much as possible, reducing the pressure loss of the backwash water in the flotation container.

[0007] Optionally, the sewage pump is lower than the filter packing assembly; the flushing sewage pipe has a rising pipe section, the rising pipe section is close to the flotation container, the rising pipe section first extends upward, then extends horizontally, and then extends downward to the sewage pump.

[0008] By adopting the above technical solution, the flushing sewage pipe is connected to the flotation container through the rising pipe section, which can make the liquid level during the drainage of the flotation container higher than the top interface of the packing layer, so that the port of the flushing sewage pipe close to the flotation container is fully immersed under the liquid level of the flotation container, so that the flushing sewage pipe can suck the backwash water in a full pipe state, thereby increasing the flow rate of the backwash water.

[0009] Optionally, the flushing sewage pipe is provided with a sewage branch pipe, the sewage branch pipe is provided with a switch valve, the sewage branch pipe is horizontally arranged, the sewage branch pipe is connected to the rising pipe section, and the height position of the sewage branch pipe is flush with or higher than the highest point of the rising pipe section.

[0010] By adopting the above technical solution, there is suspended dirt in the water between the top interface of the packing layer and the liquid level in the flotation container. When the switch valve is opened, the dirt floating on the liquid surface can be discharged through the sewage branch pipe and the flushing sewage pipe, reducing the dirt floating on the liquid surface passing through the packing layer, thereby reducing the situation of the floating dirt reattaching to the filter packing.

[0011] Optionally, the flushing sewage pipe includes a main pipe and a plurality of horizontal branch pipes. The horizontal branch pipes are arranged at intervals in the height direction. The horizontal branch pipes are located between the upper and lower interfaces of the packing layer. The horizontal branch pipes are provided with switch valves. One end of the horizontal branch pipe is connected to the flotation container, and the other end of the horizontal branch pipe is respectively connected to the main pipe. The main pipe is connected to the sewage pump.

[0012] By adopting the above technical solution, the main pipe of the flushing sewage discharge pipe is connected to the air flotation container through different horizontal branch pipes, which can change the liquid level height during flushing sewage discharge. By sequentially switching and opening the on-off valves of different horizontal branch pipes from bottom to top, the liquid level height of flushing sewage discharge can be changed stage by stage, so as to realize targeted cleaning of different height positions of the packing layer, which is beneficial to improving the cleaning effect.

[0013] Optionally, a guide plate array is arranged inside the air flotation container. The guide plate array is located below the packing layer assembly. The guide plate array includes a plurality of guide plates. The guide plates are arranged in sequence along the orientation of the water injection port of the backwashing pipe. The surface of the guide plate close to the backwashing pipe is inclined upward.

[0014] By adopting the above technical solution, the guide plate can guide the water flow injected into the air flotation container by the backwashing pipe, so that the backwashing water can flow to the packing layer as much as possible, so as to make full use of the flushing effect of the backwashing water as much as possible.

[0015] Optionally, a spiral filter screen is buried inside the packing layer. The spiral filter screen can separate the annular space between the air flotation container and the vertical inner cylinder; a filter packing feeding pipe and a filter packing discharging pipe are arranged on the peripheral wall of the air flotation container. The filter packing feeding pipe faces the space above the lower edge of the spiral filter screen, and the filter packing discharging pipe faces the space above the upper edge of the spiral filter screen. The filter packing feeding pipe and the filter packing discharging pipe are both provided with on-off valves; a screw feeder is arranged at one end of the filter packing discharging pipe far away from the air flotation container.

[0016] By adopting the above technical solution, when the filtering effect of the filter packing is difficult to be effectively improved by backwashing after a long time of use, the on-off valves of the filter packing feeding pipe and the filter packing discharging pipe are opened, and then a new filter packing is extruded and conveyed into the air flotation container by using the screw feeder, so that the filter packing moves continuously upward along the upper surface of the spiral filter screen under the pushing action of the screw feeder, and thus the filter packing at the top of the packing layer is discharged outwards from the packing discharging pipe. During the working process of the packing layer, the blockage degree of the filter packing at the top is relatively significant. By filling the filter packing from bottom to top, the filter packing with a significant blockage degree can be replaced in a timely manner, so that the filtering effect of the filter layer after filling with new material is similar to that in the natural use situation. By locally replacing the packing in the packing layer through the screw conveyor, it is not necessary to disassemble the vertical flow air flotation machine, making the replacement of the filter packing more convenient.

[0017] Optionally, an installation window is provided on the peripheral wall of the air flotation container, and a sealing plate is detachably arranged outside the air flotation container. The sealing plate closes the installation window, and a buffer sealing ring is arranged between the sealing plate and the installation window. A linear vibrator is installed on the outer side of the sealing plate. The linear vibrator is fixedly provided with a vibration connecting rod, and the vibration connecting rod passes through the sealing plate and abuts against the spiral filter screen. By adopting the above technical solution, the linear vibrator can vibrate the spiral filter screen through the vibration connecting rod, so that the filtering packing moves directionally along the upper surface of the spiral filter screen. The linear vibrator is used in cooperation with the screw feeder to convey the filtering packing, which is beneficial to improving the moving speed of the filtering packing in the packing layer, thereby improving the conveying efficiency of the filtering packing. The vibration connecting rod is connected through the sealing plate, and the sealing plate and the air flotation container are sealed and buffered by the buffer sealing ring, so that the vibration energy of the linear vibrator acts intensively on the spiral filter screen.

[0018] Optionally, a screen is provided at one end of the filtering packing discharge pipe close to the air flotation container. The aperture of the screen is larger than the maximum value of the particle size range of the packing in the packing layer and smaller than twice the maximum value of the particle size range.

[0019] By adopting the above technical solution, the screen can form an obstructive effect on the filling material, so that the filtering packing in the packing layer slowly discharges from the air flotation container, thereby reducing the situation that a large amount of granular materials in the packing layer rush out of the air flotation container, which is beneficial to keeping the filtering packing in the packing layer dense.

[0020] Optionally, a metal framework is provided on the lower surface of the spiral filter screen. The metal framework includes several main ribs spirally extending along the lower surface of the spiral filter screen, and connecting ribs are connected between the main ribs.

[0021] By adopting the above technical solution, the metal framework can strengthen the spiral filter screen, keep the structure of the spiral filter screen stable, and reduce the deformation of the spiral filter screen.

[0022] Optionally, a vacuum pump is further included. The vacuum pump is connected to the air flotation container through a negative pressure pipe, and the connection position between the negative pressure pipe and the air flotation container is higher than the installation position of the packing layer assembly. The top of the air flotation container is hermetically arranged.

[0023] By adopting the above technical solution, before backwashing the packing layer, first lower the liquid level in the air flotation container to be lower than the height of the filtering layer, then use the vacuum pump to evacuate the air flotation container, so that the filtering packing is vacuum desorbed, and then backwashing is carried out, which is beneficial to further improving the cleaning effect of the filtering packing.

[0024] To sum up, the present application includes at least one of the following beneficial technical effects: When flushing the packing layer, clean water is pumped into the air flotation container through the backwashing pipe, and at the same time, the sewage pump is turned on. The sewage pump sucks the backwashing sewage in the air flotation container, so that the sewage pump sucks the sewage in the air flotation container at a speed close to the flushing speed of the backwashing pipe. The sewage pump sucking the sewage in the air flotation container can accelerate the drainage speed in the air flotation container, which is beneficial to improving the flushing and cleaning effect of the packing layer.

[0025] After the filter packing has been used for a long time, the switching valves of the filter packing feeding pipe and the filter packing discharging pipe are opened, and then the spiral feeder is used to extrude and convey new filter packing to the inside of the air flotation container, continuously moving upward along the upper surface of the spiral filter screen, so as to discharge the filter packing at the top of the packing layer out of the packing discharging pipe. By locally replacing the packing in the packing layer through the spiral conveyor, it is not necessary to disassemble the vertical flow air flotation machine, making the replacement of the filter packing more convenient. Description of the Drawings

[0026] Figure 1 It is a schematic diagram of the overall structure of Embodiment 1.

[0027] Figure 2 It is a schematic diagram of the overall structure of Embodiment 2.

[0028] Figure 3 It is a schematic diagram of the overall structure of Embodiment 3.

[0029] Figure 4 It is a three-dimensional structure diagram of the spiral filter screen of Embodiment 3.

[0030] Figure 5 It is a schematic diagram showing the installation state of the straight vibrator in Embodiment 3.

[0031] Figure 6 It is a schematic diagram of the overall structure of Embodiment 4.

[0032] Description of the Reference Numerals: 1. Vertical flow air flotation machine; 11. Air flotation container; 13. Vertical inner cylinder; 131. Waste water pipe; 132. Pipeline of dissolved air tank; 14. Filter packing assembly; 141. Permeable partition board; 142. Packing layer; 1421. Anthracite particle layer; 1422. Sand particle layer; 143. Spiral filter screen; 1431. Metal framework; 1432. Main reinforcement; 1433. Connecting reinforcement; 15. Backwash pipe; 16. Flushing and sewage discharge pipe; 161. Filter element; 162. Rising pipe section; 163. Sewage branch pipe; 164. Main pipe; 165. Horizontal branch pipe; 17. Deflector array; 171. Deflector; 18. Installation window; 19. Sealing plate; 191. Buffer sealing ring; 1911. Bolt hole; 2. Switch valve; 3. Sewage pump; 4. Vacuum pump; 41. Negative pressure pipe; 5. Filter packing feeding pipe; 6. Filter packing discharging pipe; 61. Screen; 7. Screw feeder; 8. Linear vibrator; 81. Vibration connecting rod. Specific embodiments

[0033] The following will further describe the present application in detail with reference to the Figure 1-6 accompanying drawings. Embodiment 1

[0034] The embodiment of the present application discloses an oil-water separation device for treating oily waste water on ships. Referring to Figure 1 , the oil-water separation device for treating oily waste water on ships includes a vertical flow air flotation machine 1. The vertical flow air flotation machine 1 includes an air flotation container 11, and the inner side of the air flotation container 11 can maintain air pressure balance with the outer space; a vertical inner cylinder 13 and a filter packing assembly 14 are arranged in the air flotation container 11. The bottom end of the vertical inner cylinder 13 is closed, and the bottom of the vertical inner cylinder 13 is used to connect the waste water pipe 131 and the pipeline 132 of the dissolved air tank. The filter packing assembly 14 is located in the annular space between the vertical inner cylinder 13 and the air flotation container 11. The filter packing assembly 14 includes a permeable partition board 141 and a packing layer 142 located on the permeable partition board 141. The filter packing of the packing layer 142 includes anthracite particles and sand particles. The anthracite particles and the sand particles are arranged in upper and lower layers to form an anthracite particle layer 1421 and a sand particle layer 1422, and the anthracite particle layer 1421 is located below the sand particle layer 1422.

[0035] The peripheral wall of the air flotation container 11 is provided with a backwashing pipe 15 and a flushing sewage discharge pipe 16. Both the backwashing pipe 15 and the flushing sewage discharge pipe 16 are provided with on-off valves 2. The backwashing pipe 15 is used to connect to a water supply network or a water supply pump. The connection position between the backwashing pipe 15 and the air flotation container 11 vertically partially coincides with the bottom boundary of the packing layer 142, that is, the height difference between the center of the port where the backwashing pipe 15 connects to the air flotation container 11 and the bottom boundary of the packing layer 142 is less than the diameter of the backwashing pipe 15. The connection position of the flushing sewage discharge pipe 16 on the air flotation container 11 partially coincides with the top boundary of the packing layer 142, that is, the height difference between the center of the port where the flushing sewage discharge pipe 16 connects to the air flotation container 11 and the top boundary of the packing layer 142 is less than the diameter of the backwashing pipe 15.

[0036] In this embodiment, the pipe diameter of the backwashing pipe 15 is the same as that of the flushing sewage discharge pipe 16. The center of the port of the backwashing pipe 15 close to the air flotation container 11 is lower than the bottom boundary of the packing layer 142, and the center of the port of the flushing sewage discharge pipe 16 close to the air flotation container 11 is higher than the top boundary of the packing layer 142.

[0037] The flushing sewage discharge pipe 16 is provided with a sewage pump 3, and the sewage pump 3 is lower than the filter packing assembly 14; the sewage pump 3 can be a centrifugal pump or a screw pump and other water pumps with relatively large suction. A filter element 161 is provided between the flushing sewage discharge pipe 16 and the air flotation container 11. The filter element 161 can specifically be a Y-type filter or a filter net installed on a flange structure. The filter element 161 is used to prevent filter packing particles from entering the flushing sewage discharge pipe 16. The flushing sewage discharge pipe 16 has a rising pipe section 162. The rising pipe section 162 is close to the air flotation container 11. The rising pipe section 162 first extends upward, then horizontally, and then downward to the sewage pump 3.

[0038] When using the backwashing pipe 15 to wash the packing layer 142, first discharge the dirt suspended in the air flotation container 11, and then pump clean water into the air flotation container 11 using the backwashing pipe 15. At the same time, turn on the sewage pump 3, and use the sewage pump 3 to suck the backwashing sewage in the air flotation container 11, so that the sewage pump 3 sucks the sewage in the air flotation container 11 at a speed close to the flushing speed of the backwashing pipe 15.

[0039] The flushing sewage discharge pipe 16 is provided with a sewage branch pipe 163. The sewage branch pipe 163 is provided with an on-off valve 2. The sewage branch pipe 163 is horizontally arranged. The sewage branch pipe 163 is connected to the rising pipe section 162. The height position of the sewage branch pipe 163 is flush with or higher than the highest point of the rising pipe section 162.

[0040] A deflector array 17 is provided inside the air flotation container 11. The deflector array 17 is located below the packing layer 142 assembly. The deflector array 17 includes a plurality of deflectors 171. The deflectors 171 are arranged in sequence along the orientation of the water injection port of the backwashing pipe 15. The surface of the deflector 171 on the side close to the backwashing pipe 15 is inclined upward.

[0041] The flow deflector 171 can direct the water flow injected into the air flotation container 11 by the backwash pipe 15, enabling the backwash water to flow towards the packing layer 142 as much as possible, so as to make full use of the flushing effect of the backwash water.

[0042] In this embodiment, the on-off valves 2 on each pipeline can specifically use gate valves, globe valves or ball valves, etc. The types and specifications of the on-off valves 2 are selected according to the specific conditions of the pipelines.

[0043] The implementation principle of the oil-water separation device for treating oily wastewater on ships in the embodiment of the present application is as follows: The sewage in the vertical flow air flotation machine 1 passes through the filter packing assembly 14 from top to bottom, and the packing layer 142 of the filter packing assembly 14 filters the dirt suspended in the sewage. After the packing layer 142 has been used for a long time and needs to be flushed, first discharge the dirt suspended in the air flotation container 11, then pump clean water into the air flotation container 11 using the backwash pipe 15, and at the same time turn on the sewage pump 3 to suck the backwash sewage in the air flotation container 11 using the sewage pump 3, so that the sewage pump 3 sucks the sewage in the air flotation container 11 at a speed close to the flushing speed of the backwash pipe 15.

[0044] Since the position where the flushing sewage pipe 16 is connected to the air flotation container 11 is close to the top boundary of the packing layer 142, and the sewage pump 3 sucks the sewage in the air flotation container 11, it can accelerate the drainage speed in the air flotation container 11, so that the top boundary of the packing layer 142 is subjected to the scouring action of the water flow at a relatively high speed, which is beneficial to improving the flushing and cleaning effect of the packing layer 142. Since the backwash pipe 15 is close to the bottom boundary of the packing layer 142, the backwash water can directly flush the packing layer 142 as much as possible, reducing the pressure loss of the backwash water in the air flotation container 11. Embodiment 2

[0045] Refer to Figure 2 , the difference between this embodiment and Embodiment 1 is that the flushing sewage pipe 16 includes a main pipe 164 and several horizontal branch pipes 165. The horizontal branch pipes 165 are arranged at intervals in the height direction. The horizontal branch pipes 165 are located between the upper and lower interfaces of the packing layer 142. The horizontal branch pipes 165 are provided with on-off valves 2. One end of the horizontal branch pipe 165 is connected to the air flotation container 11, and the other ends of the horizontal branch pipes 165 are respectively connected to the main pipe 164, and the main pipe 164 is connected to the sewage pump 3.

[0046] The main pipe 164 of the flushing sewage pipe 16 communicates with the air flotation container 11 through different horizontal branch pipes 165, which can change the liquid level height during flushing and sewage discharge. By sequentially switching on the on-off valves 2 of different horizontal branch pipes 165 from bottom to top, the liquid level height during flushing and sewage discharge can be changed stage by stage, so as to achieve targeted cleaning of different height positions of the packing layer 142, which is beneficial to improving the cleaning effect. Example 3

[0047] Referring to Figures 3-5 , the difference between this embodiment and Embodiment 1 is that a spiral filter screen 143 is buried inside the filler layer 142. Specifically, it is buried in the anthracite filler layer 142. The spiral filter screen 143 can separate the annular space between the air flotation container 11 and the vertical inner cylinder 13. The peripheral wall of the air flotation container 11 is provided with a filter filler feeding pipe 5 and a filter filler discharging pipe 6. The filter filler feeding pipe 5 faces the space above the lower edge of the spiral filter screen 143, and the filter filler discharging pipe 6 faces the space above the upper edge of the spiral filter screen 143. Both the filter filler feeding pipe 5 and the filter filler discharging pipe 6 are provided with on-off valves 2.

[0048] Referring to Figure 4 , a metal framework 1431 is provided on the lower surface of the spiral filter screen 143. The metal framework 1431 includes a number of main ribs 1432 spirally extending along the lower surface of the spiral filter screen 143, and connecting ribs 1433 are connected between the main ribs 1432.

[0049] Referring to Figure 3 , a screen 61 is provided at one end of the filter filler discharging pipe 6 close to the air flotation container 11. The aperture of the screen 61 is larger than the maximum value of the particle size range of the filler in the filler layer 142 and smaller than twice the maximum value of the particle size range.

[0050] Referring to Figure 3 , a screw conveyor 7 is provided at one end of the filter filler discharging pipe 6 far from the air flotation container 11. The discharging port of the screw conveyor 7 is connected to the discharging pipe by a flange and a bolt-nut assembly.

[0051] Referring to Figure 3 and Figure 5 , an installation window 18 is formed on the peripheral wall of the air flotation container 11. A sealing plate 19 is detachably arranged outside the air flotation container 11 through a threaded fastener. The sealing plate 19 closes the installation window 18, and a buffer sealing ring 191 is arranged between the sealing plate 19 and the installation window 18; a linear vibrator 8 is installed on the outer side of the sealing plate 19. A vibration connecting rod 81 is fixedly arranged on the linear vibrator 8. The vibration connecting rod 81 passes through the sealing plate 19 and abuts against the spiral filter screen 143. The vibration connecting rod 81 is welded and sealed with the sealing plate 19.

[0052] After the filter packing has been used for a long time, the liquid level of the air flotation container 11 is lowered to a height lower than the packing layer 142, and then the switch valve 2 of the filter packing feeding pipe 5 and the filter packing discharge pipe 6 is opened, and then the screw feeder 7 is used to squeeze and convey new filter packing to the inner side of the air flotation container 11, so that the filter packing continues to move upward along the upper surface of the spiral filter screen 143 under the pushing action of the screw feeder 7, so that the filter packing on the top of the packing layer 142 is discharged from the packing discharge pipe. In this process, the filter packing is conveyed by the straight vibrator 8 in cooperation with the screw feeder 7. The packing in the packing layer 142 is partially replaced by the screw conveyor, without disassembling the vertical flow air flotation machine 1, so that the replacement of the filter packing is more convenient. Example 4

[0053] Reference Figure 6 The difference between this embodiment and embodiment 1 is that the oil-water separation device further includes a vacuum pump 4, which is connected to the flotation container 11 through a negative pressure pipe 41, and the connection position between the negative pressure pipe 41 and the flotation container 11 is higher than the installation position of the packing layer 142 assembly. In this embodiment, the flotation container 11 needs to be set as a top-closed structure to cooperate with the vacuum pump 4. An exhaust pipe is set at the top of the flotation container 11, and the exhaust pipe is provided with a switch valve 2. The switch valve 2 on the exhaust pipe is kept in a normally open state. When the vacuum pump 4 is working, the switch valve 2 on the exhaust pipe is closed.

[0054] Before backwashing the packing layer 142 , the liquid level in the flotation container 11 may be lowered to a level lower than the packing layer 142 , and then the flotation container 11 may be vacuum desorbed using the negative pressure pipe 41 to improve the cleaning effect of the packing layer 142 .

[0055] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An oil-water separation device for treating oily wastewater on ships, characterized in that: It includes a vertical flow flotation machine (1), and the vertical flow flotation machine (1) includes a flotation container (11). A vertical inner cylinder (13) and a filter packing assembly (14) are arranged inside the flotation container (11). The filter packing assembly (14) is located in the annular space between the vertical inner cylinder (13) and the flotation container (11). The filter packing assembly (14) includes a water-permeable partition plate (141) and a packing layer (142) located on the water-permeable partition plate (141). The water-permeable partition plate (141) can permeate water. An anti-flushing pipe (15) and a flushing and sewage discharge pipe (16) are arranged on the peripheral wall of the flotation container (11). The connection position between the anti-flushing pipe (15) and the flotation container (11) partially coincides with the bottom boundary of the packing layer (142) vertically. The connection position of the flushing and sewage discharge pipe (16) on the flotation container (11) partially coincides with the top boundary of the packing layer (142). A sewage pump (3) is arranged on the flushing and sewage discharge pipe (16).

2. An oil-water separation device for treating oily wastewater on a ship according to claim 1, characterized in that: The sewage pump (3) is lower than the filter packing assembly (14). The flushing and sewage discharge pipe (16) has an ascending pipe section (162). The ascending pipe section (162) is close to the flotation container (11). The ascending pipe section (162) first extends upward, then extends horizontally, and then extends downward to the sewage pump (3).

3. An oil-water separation device for treating oily wastewater on a ship according to claim 2, characterized in that: The flushing and sewage discharge pipe (16) is provided with a sewage branch pipe (163). A switch valve (2) is arranged on the sewage branch pipe (163). The sewage branch pipe (163) is horizontally arranged. The sewage branch pipe (163) is connected to the ascending pipe section (162). The height position of the sewage branch pipe (163) is flush with or higher than the highest point of the ascending pipe section (162).

4. An oil-water separation device for treating oily wastewater used in ships according to claim 1, characterized in that: The flushing and sewage discharge pipe (16) includes a main pipe (164) and several horizontal branch pipes (165). Each of the horizontal branch pipes (165) is arranged at intervals in the height direction. The horizontal branch pipes (165) are located between the upper and lower interfaces of the packing layer (142). A switch valve (2) is arranged on the horizontal branch pipe (165). One end of the horizontal branch pipe (165) is connected to the flotation container (11), and the other end of the horizontal branch pipe (165) is respectively connected to the main pipe (164). The main pipe (164) is connected to the sewage pump (3).

5. The oil-water separation device for treating oily wastewater on a ship according to claim 1, wherein: A deflector array (17) is arranged inside the flotation container (11). The deflector array (17) is located below the packing layer (142) assembly. The deflector array (17) includes a plurality of deflectors (171). The deflectors (171) are arranged in sequence along the orientation of the water injection port of the anti-flushing pipe (15). The surface of the deflector (171) on the side close to the anti-flushing pipe (15) is inclined upward.

6. The oil-water separation device for treating oily wastewater used in a ship according to claim 1, characterized in that: A spiral filter screen (143) is embedded inside the packing layer (142), and the spiral filter screen (143) can separate the annular space between the air flotation container (11) and the vertical inner cylinder (13); a filter packing feeding pipe (5) and a filter packing discharging pipe (6) are arranged on the peripheral wall of the air flotation container (11), the filter packing feeding pipe (5) faces the space above the lower edge of the spiral filter screen (143), the filter packing discharging pipe (6) faces the space above the upper edge of the spiral filter screen (143), and a switching valve (2) is arranged on both the filter packing feeding pipe (5) and the filter packing discharging pipe (6); a screw feeder (7) is arranged at one end of the filter packing discharging pipe (6) far away from the air flotation container (11).

7. The oil-water separation device for treating oily wastewater on a ship according to claim 6, characterized in that: An installation window (18) is opened on the peripheral wall of the air flotation container (11), a sealing plate (19) is detachably arranged outside the air flotation container (11), the sealing plate (19) closes the installation window (18), and a buffer sealing ring (191) is arranged between the sealing plate (19) and the installation window (18); a straight vibrator (8) is installed on the outer side of the sealing plate (19), a vibration connecting rod (81) is fixedly arranged on the straight vibrator (8), the vibration connecting rod (81) passes through the sealing plate (19) and abuts against the spiral filter screen (143).

8. The oil-water separation device for treating oily wastewater used in ships according to claim 6, characterized in that: A screen (61) is arranged at one end of the filter packing discharging pipe (6) close to the air flotation container (11), and the aperture of the screen (61) is larger than the maximum value of the particle size range of the packing in the packing layer (142) and smaller than twice the maximum value of the particle size range.

9. An oil-water separation device for treating oily wastewater on a ship according to claim 6, characterized in that: A metal framework (1431) is arranged on the lower surface of the spiral filter screen (143), the metal framework (1431) comprises a plurality of main ribs (1432) spirally extending along the lower surface of the spiral filter screen (143), and connecting ribs (1433) are connected between the main ribs (1432).

10. An oil-water separation device for treating oily wastewater on a ship according to claim 1, characterized in that: It further comprises a vacuum pump (4), the vacuum pump (4) is connected to the air flotation container (11) through a negative pressure pipe (41), and the connection position between the negative pressure pipe (41) and the air flotation container (11) is higher than the installation position of the packing layer (142) assembly; the top of the air flotation container (11) is hermetically arranged.

Images