JP2009131810A - Oil/water separator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil/water separator capable of efficiently separating mixed liquid of oil and water into oil and water. <P>SOLUTION: The oil/water separator is provided with: a first tank; a feed pipe feeding the mixed liquid of oil and water to the first tank; a second tank having a weir for overflowing liquid and communicated with a lower part of the first tank; a third tank storing liquid overflowing from the weir of the second tank; an oil receiver recovering oil floating up to the liquid level of the first tank; and a fourth tank receiving the oil recovered by the oil receiver. The feed pipe is opened in the first tank at a position lower than the height of the weir of the second tank. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an oil-water separator that separates a mixed liquid of oil and water into oil and water.

  2. Description of the Related Art Conventionally, as an oil-water separator that separates an oil and water mixture into oil and water, an apparatus that separates the oil and water using a specific gravity difference is known (see, for example, Patent Document 1). In the oil-water separator described in Patent Document 1, the mixed liquid is supplied into the tank from above the liquid level, and the supplied mixed liquid is separated using the specific gravity difference between the oil and water.

JP 2003-144804 A

  However, in the oil-water separator described above, the mixed liquid is supplied into the tank from above the liquid level. The mixed liquid supplied from above the liquid level is extremely well mixed and stirred when flowing into the liquid level. Thus, when the mixed liquid of oil and water is mixed and stirred, the liquid may be emulsified. The emulsified mixed solution is in a state where it is difficult to separate oil and water. Therefore, in the above-described oil / water separator, the mixed solution is emulsified, and therefore, there is a problem in that it cannot be efficiently separated into oil and water.

  Then, an object of this invention is to provide the oil-water separator which can isolate | separate the liquid mixture of oil and water into oil and water efficiently.

  The oil / water separator according to the present invention has a first tank, a supply pipe for supplying a mixed liquid of oil and water to the first tank, a weir for overflowing the liquid, and communicates with a lower portion of the first tank. A second tank that stores liquid that overflows from the weir of the second tank, an oil receiver that is provided in the first tank and collects the oil floating on the liquid surface of the first tank, A fourth tank to which the oil recovered by the oil receiver is supplied, and the supply pipe is open at a position lower than the height of the weir of the second tank in the first tank.

  In the oil / water separator according to the present invention, since the supply pipe opens at a position lower than the height of the weir in the second tank, the mixed liquid is supplied into the liquid in the first tank. Compared with the case where the liquid mixture supplied in a liquid is supplied from the outside of a liquid, it is hardly stirred. And in this 1st tank, oil with small specific gravity floats upwards, water with large specific gravity sinks below, and oil-water separation is performed efficiently. The water which sinks below the first tank flows into the second tank through the lower part of the first tank. The water that has flowed into the second tank overflows from the weir of the second tank and is stored in the third tank. On the other hand, the oil that has floated and separated above the first tank reaches the surface of the mixed liquid to form an oil film, and is collected by the oil receiver. The oil collected by the oil receiver will be supplied to the fourth tank. Thus, since the oil-water separator which concerns on this invention isolate | separates, without almost stirring a liquid mixture, it can isolate | separate oil and water efficiently.

  The supply port is preferably opened at a height closer to the bottom of the first tank than the height of the weir of the second tank. For example, when the supply port is opened at a height close to the height of the weir in the second tank, the mixed liquid is supplied near the liquid surface of the first tank. In this case, the oil film formed on the liquid surface of the first tank is disturbed by the flow of the liquid mixture supplied from the supply port, and the separated oil and water may be mixed. Therefore, the supply port is opened to a height closer to the bottom of the first tank than the height of the weir in the second tank, so that the oil film formed on the liquid surface of the first tank is mixed with the first tank without being disturbed. Liquid can be supplied.

  Moreover, the 3rd tank outlet which discharges | emits the liquid in a 3rd tank outside, the 3rd tank strainer which is provided in a 3rd tank and filters the liquid which flows in into a 3rd tank discharge port, and a 3rd tank strainer The third tank strainer cleaning nozzle that injects the cleaning liquid into the fourth tank, the fourth tank discharge port that discharges the liquid in the fourth tank to the outside, and the liquid flowing into the fourth tank discharge port that is provided in the fourth tank is filtered. It is preferable to further include a fourth tank strainer that performs the above and a fourth tank strainer cleaning nozzle that injects the cleaning liquid onto the fourth tank strainer.

  According to this configuration, even if foreign matter is contained in the liquid supplied to the third tank or the oil supplied to the fourth tank, it is filtered by the strainer, so that the discharge port is not blocked by the foreign substance. can do. Even if foreign matter adheres to the strainer by filtration, the foreign matter attached by the cleaning liquid sprayed from the strainer cleaning nozzle can be removed, so that the strainer can be prevented from being clogged.

  The oil receiver is a hook-shaped member, and is preferably supported so as to be rotatable around the axis of the hook-shaped member. According to this oil receiver, the oil floated on the liquid surface of the first tank by rotating the oil receiver around the axis can be efficiently recovered.

  In addition, it is preferable to further include an ejector that sucks the gas in the first tank, the second tank, the third tank, and the fourth tank. By providing such an ejector, it is possible to prevent the tank from being filled with high-temperature steam, combustible gas, or the like. For this reason, when the tank is opened for inspection or the like, the filled high-temperature water vapor, combustible gas, odorous gas or the like is not ejected to the outside, and the safety of the oil / water separator can be improved.

  Moreover, it is preferable that a baffle plate is provided in a 1st tank. Due to this baffle plate, the time during which the mixed liquid stays in the first tank is lengthened. As a result, the oil is prevented from flowing into the second tank without being sufficiently separated from the liquid in the first tank. Therefore, the oil / water separator can more reliably separate the oil and water in the first tank.

  According to the present invention, a mixed liquid of oil and water can be efficiently separated into oil and water.

  Hereinafter, preferred embodiments of an oil-water separator according to the present invention will be described in detail with reference to the drawings.

  As shown in FIGS. 1, 2 and 3, the oil / water separator according to the present invention includes an oil / water separation tank 1 for separating oil and a mixed liquid of water into water and oil. The inside of the oil / water separation tank 1 is divided into four tanks by partition walls or the like. As the first tank, a gravity separation tank A that performs gravity separation for separating oil and water using a specific gravity difference between oil and water is formed. This gravity separation is a method for separating oil and water, in which oil having a small specific gravity floats to the top of the tank and water having a large specific gravity sinks to the bottom of the tank. The gravity separation tank A is provided with a supply pipe 2 for supplying a mixed liquid.

  Further, as the second tank, a communication tank B that is adjacent to the gravity separation tank A via the partition wall 3a and communicates with the lower part of the gravity separation tank A is formed. The liquid after gravity separation flows into the communication tank B through the lower part of the gravity separation tank A. The communication tank B has a weir 4 that overflows the liquid that has flowed in, and gravity separation is performed in a state where the liquid overflows from the weir 4. For this reason, at the time of gravity separation, the height of the weir 4 becomes the height h of the liquid level in the gravity separation tank A and the communication tank B.

  And as a 3rd tank, the liquid tank C which adjoins the communicating tank B via the weir 4 and stores the liquid overflowing from the weir 4 of the communicating tank B is formed. The liquid tank C is provided with a liquid discharge port (third tank discharge port) 5 for discharging the liquid. The liquid after gravity separation is discharged through the liquid discharge port 5.

  In addition, as a fourth tank, an oil tank D that is adjacent to the gravity separation tank A via the partition wall 3b and stores the oil separated by gravity in the gravity separation tank A is formed. The oil tank D is provided with an oil discharge port (fourth tank discharge port) 6 for discharging oil. Through this oil discharge port 6, the oil after gravity separation is discharged.

  As shown in FIG. 2, the supply pipe 2 provided in the gravity separation tank A opens at a position lower than the height of the weir 4 of the communication tank B. For this reason, the supply pipe 2 is opened at a position lower than the height h of the liquid level at the time of gravity separation. As a result, the mixed liquid is supplied into the liquid via the supply pipe 2. Further, the supply pipe 2 opens to a height closer to the bottom of the gravity separation tank A than the height of the weir 4 of the communication tank B. For this reason, since a liquid mixture is supplied to the position away from the liquid level, it becomes difficult for the liquid level to be stirred by the flow of the liquid mixture. This effect is particularly high when the supply pipe 2 is open downward.

  In the gravity separation tank A, a baffle plate 7 is provided for preventing the liquid flow. The baffle plate 7 is provided between the supply pipe 2 and the partition wall 3a, and its upper part is inclined toward the supply pipe 2 so as to form an angle of 50 to 70 degrees with respect to the bottom of the gravity separation tank A. Yes. By this baffle plate 7, the mixed liquid supplied into the liquid by the supply pipe 2 is prevented from flowing. The liquid mixture whose flow is blocked by the baffle plate 7 will stay in the gravity separation tank A for a long time. As a result, in the gravity separation tank A, it is possible to prevent the liquid from flowing into the communication tank B without sufficient gravity separation. Therefore, the gravity separation in the gravity separation tank A can be more reliably performed by providing the baffle plate 7.

  In this way, in the mixed liquid staying in the gravity separation tank A, gravity separation is performed in which oil having a small specific gravity floats to the upper part of the tank and water having a large specific gravity sinks to the lower part of the tank. And the water which sinks to the lower part of a tank by this gravity separation will flow into the communication tank B connected with the lower part of the gravity separation tank A. Thereafter, the water flowing into the communication tank B overflows from the weir 4 and is stored in the liquid tank C.

  As shown in FIGS. 1, 2, and 3, the liquid tank C is provided with a liquid discharge port 5 for discharging stored liquid, and the liquid tank is provided on the liquid discharge port side and the weir side. A liquid tank strainer (third tank strainer) 8 for partitioning the inside of C is provided. The liquid discharge port 5 opens downward. The liquid tank strainer 8 is a porous or net-like partition plate that removes foreign matters contained in the liquid overflowing from the weir 4 of the communication tank B and allows the liquid to flow into the liquid discharge port 5. is there. As the liquid tank strainer 8, for example, a plate member having a mesh of 40 mesh can be used.

  A liquid tank strainer washer 9 for cleaning the liquid tank strainer 8 by spraying the cleaning liquid onto the liquid tank strainer 8 is provided on the liquid discharge port side partitioned by the liquid tank strainer 8.

  As shown in FIGS. 3 and 5 (a), the liquid tank strainer washer 9 includes a main pipe 9d extending in the vertical direction, and a nozzle (first nozzle) for injecting a plurality of cleaning liquids provided on the peripheral surface of the main pipe 9d. 3 tank strainer cleaning nozzles) 9a, 9b, 9c. As shown in FIG. 3, a cleaning liquid supply pipe 10 for supplying a cleaning liquid to the main pipe 9d is connected to the main pipe 9d, and the cleaning liquid supply pipe 10 is provided with cleaning liquid valves 10a, 10b, and 10c.

  As shown in FIG. 5A, the nozzles 9a, 9b, 9c provided on the main pipe 9d are arranged with a predetermined interval in the extending direction of the main pipe 9d. Further, as shown in FIGS. 5A and 5B, the nozzle portions 9a, 9b, and 9c are arranged so as to inject the cleaning liquid in different directions in the circumferential direction of the main pipe 9d. For example, the nozzle 9a and the nozzle 9b are directed in different directions on the left and right at intervals of 20 degrees, with the nozzle portion 9c as the center. The nozzle 9 c is arranged so as to eject the cleaning liquid substantially perpendicularly to the liquid tank strainer 8. According to the thus configured liquid tank strainer cleaner 9, the cleaning liquid can be effectively sprayed over a wide range to the liquid tank strainer 8, and the liquid tank strainer 8 can be prevented from being clogged. In particular, since the cleaning liquid is ejected from the liquid discharge port side, that is, the downstream side of the liquid, the cleaning effect is further enhanced. An example of the cleaning liquid is water, and the cleaning may be performed intermittently, for example.

  As shown in FIGS. 2 and 4, in the liquid tank C, on the liquid discharge port side partitioned by the liquid tank strainer 8, the liquid level of the liquid stored in the liquid tank C is detected. A tank level gauge 11 is provided. This liquid tank level gauge 11 detects the liquid level of the liquid tank C in three stages of HIHI, HI, and LOW in descending order. Further, this liquid tank level gauge 11 is electrically connected to a patlite 12 provided at the upper part of the oil / water separation tank 1, and the liquid level gauge 10 is a liquid level of the liquid tank C. When it is detected that the height is in the HIHI stage, the person around the oil / water separation tank 1 is alerted by emitting red light. Moreover, as the patlite 12 and the liquid tank level gauge 11, an explosion-proof type that can be used safely even in an atmosphere where flammable gas or flammable liquid exists is used.

  On the other hand, in the gravity separation tank A, the oil that rises to the upper part of the tank by gravity separation reaches the liquid level of the gravity separation tank A. The oil floating on the liquid level is collected in the gravity separation tank A by the oil receiver 13 provided at the liquid level height h.

  As shown in FIG. 6, the oil receiver 13 provided in the gravity separation tank A is a bowl-shaped member, and more specifically, a cylinder in which an opening 13 a extending along the axis X is formed. It is. Further, a side opening 13b is provided at one end of the oil receiver 13, and the other end is closed. The oil receiver 13 includes a gravity separation tank A and an oil tank D by a bearing 14 fitted in a partition wall 3b that separates the gravity separation tank A and the oil tank D, and a bearing 15 attached to a side surface of the gravity separation tank A. It is supported so that it may extend over and can be rotated around an axis.

  Further, as shown in FIG. 2, the oil receiver 13 is supported by these bearings 14 and 15 so that the height of the axis X is substantially the liquid level height h. And as shown in FIG. 1, the end of the oil receiver 13 which has the side opening part 13b protrudes in the oil tank D through the partition 3b which has the bearing 14. As shown in FIG.

  Further, as shown in FIG. 6, a rod-shaped lever 16 extending upward is attached to the oil receiver 13, and the lever-shaped oil receiver 13 is rotated by operating the lever 16. Thus, the height of the edge of the opening 13a can be changed. As a result, the height of the edge of the opening 13a can be lowered below the water surface h to allow the oil on the liquid surface to flow into the oil receiver 13, and the oil can be selectively recovered from the gravity separation layer A. When there is little oil on the water surface, the height of the edge of the opening 13 a can be raised above the water surface h so that water does not flow into the oil receiver 13. The oil collected by the oil receiver 13 in this way is supplied to the oil tank D through the side opening 13b. With such a configuration, the oil receiver 13 can recover the oil on the liquid level and efficiently recover the oil.

  As shown in FIG. 3, the oil tank D to which the oil collected in the oil receiver 13 is supplied is provided with an oil discharge port 6 for discharging the supplied oil, and the oil discharge port side An oil tank strainer (fourth tank strainer) 17 that partitions the inside of the oil tank D is provided on the opening side of the oil receiver 13. The oil discharge port 6 is preferably open downward.

  The oil tank strainer 17 is the same as the liquid tank strainer 17. For example, the oil tank strainer 17 is composed of a plate member having a mesh of 40 mesh, and after removing foreign matters contained in the oil supplied from the oil receiver 13, Oil is caused to flow into the discharge port 6. An oil tank strainer cleaner 18 that supplies cleaning liquid to clean the oil tank strainer 18 and an oil tank that detects the level of the oil supplied to the oil layer D are provided on the oil discharge port side partitioned by the oil tank strainer 17. A liquid level gauge 19 is provided.

  As shown in FIGS. 3, 5A and 5B, the oil tank strainer cleaner 18 includes a main pipe 18d and nozzles (fourth tank strainer cleaning nozzles) 18a, 18b and 18c. A cleaning liquid supply pipe 10 for supplying a cleaning liquid via a valve 10c is provided at 18d, and has the same structure and function as the liquid tank strainer cleaning device 9 provided in the liquid tank C. The oil tank level gauge 19 is electrically connected to the patrolite 12 and has the same structure and function as the liquid tank level gauge 11 provided in the liquid layer C. An example of the cleaning liquid is oil, and the cleaning may be performed intermittently, for example.

  As shown in FIG.1 and FIG.4, the oil-water separation tank 1 is provided with the ceiling part 1a for covering the gravity separation tank A, the communication tank B, the liquid tank C, and the oil tank D, and sealing each tank. The ceiling portion 1a is provided with inspection windows 20, 21, 22, and 23 for inspecting the inside of the tank. For example, the inspection window 23 shown in FIG. 4 is used for inspecting the liquid tank strainer 8, the liquid tank strainer cleaner 9, the liquid tank liquid level gauge 11, and the like in the liquid tank C. These inspection windows 20, 21, 22, and 23 are closed by a lid (not shown) except during inspection.

  As shown in FIG. 4, the oil / water separation tank 1 is provided with a lifting ladder 24 for climbing to the ceiling 1 a and a fall prevention fence 25. By providing the elevating ladder 24 and the fall prevention fence 25 for preventing the fall from the ceiling 1a, the safety of the work in the ceiling 1a can be enhanced.

  As shown in FIG. 1, a cleaning communication pipe 26 that communicates the gravity separation tank A and the liquid tank D is provided on the side surface of the oil / water separation tank 1. The cleaning communication pipe 26 is provided with a cleaning communication pipe valve 28. When the cleaning communication pipe valve 27 is opened, the liquids in the gravity separation tank A and the communication tank B are cleaned. Into the liquid tank C. The liquid flowing into the liquid tank C is discharged from the liquid discharge port 5. Thus, by discharging the liquid in the gravity separation tank A and the communication tank B, the gravity separation tank A and the communication tank B can be appropriately cleaned and inspected.

  As shown in FIG. 2, the ceiling portion 1 a of the oil / water separation tank 1 is provided with a suction port 28 for sucking the gas confined in the oil / water separation tank 1. The suction port 28 communicates with an ejector 29 that generates a negative pressure by a venturi mechanism. The ejector 29 is supplied with compressed air from an ejector air source 30, and an ejector valve 31 for adjusting the flow rate of the compressed air is provided between the ejector air source 30 and the ejector 29. . The ejector 29 sucks the gas in the oil / water separation tank 1 by generating a negative pressure with the compressed air supplied from the ejector air source 30.

  The gas sucked by the ejector 29 is sent to the deodorization tank 32. And after deodorizing process is performed in the deodorizing tank 32, it will be open | released to air | atmosphere. For example, hydrogen sulfide can be removed by using ZnO or the like as a filler in the deodorization tank 32, and various odorous gases can be removed by using activated carbon or the like. According to such an ejector 29, it is possible to prevent the oil / water separation tank 1 from being filled with high-temperature steam, combustible gas, odorous gas, or the like. As a result, when the tank is opened for inspection or the like, full high-temperature water vapor, combustible gas, odorous gas, or the like is not ejected to the outside, and the safety when the tank is opened can be improved.

  Next, a discharge pipe structure for discharging the liquid in the liquid tank C and the oil in the oil tank D will be described.

  As shown in FIGS. 1 and 7, a liquid discharge pipe 40 for discharging a liquid is connected to the liquid discharge port 5 provided in the liquid tank C. An oil discharge pipe 50 for discharging oil is connected to the oil discharge port 6 provided in the oil tank D.

  As shown in FIG. 7, the liquid discharge pipe 40 and the oil discharge pipe 50 include drain valves 41 and 51 for discharging the liquid and oil to the outside, and a discharge valve 42 for controlling the flow of the liquid and oil. , 43, 52, and 53 are provided. The drain valves 41 and 51 and the discharge valves 42, 43, 52, and 53 are opened and closed when cleaning or checking the inside of the discharge pipe. The liquid discharge pipe 40 and the oil discharge pipe 50 are provided with check valves 44 and 54 for preventing the backflow of liquid and oil.

  Further, the liquid discharge pipe 40 and the oil discharge pipe 50 are provided with reciprocating pumps 45 and 55 that are operated by compressed air. The reciprocating pumps 45 and 55 are supplied with compressed air from a discharge pipe air source 60, and an electromagnetic valve 61 for adjusting the flow rate of the compressed air between the discharge pipe air source 60 and the reciprocating pumps 45 and 55. , 62 are provided.

  The reciprocating pumps 45 and 55 respectively send the liquid in the liquid discharge pipe 40 and the oil in the oil discharge pipe 50 in the discharge direction by the pressure of the compressed air supplied from the discharge pipe air source 60. Further, on both sides of the reciprocating pumps 45 and 55 in the liquid discharge pipe 40 and the oil discharge pipe 50, hose portions 46, 47, 56 and 57 each including a flange and a hose are provided, respectively.

  The pressure on the discharge side of the reciprocating pumps 45 and 55 is confirmed by pressure gauges 48 and 58, respectively. In addition, when there is an abnormality in the pressure on the discharge side of the reciprocating pumps 45 and 55, the liquid is caused to flow out to the pressure relief pipes 49 and 59. A pressure relief pipe 49 having a valve 49a, a safety valve 49b, and a valve 49c is connected, and a pressure relief pipe 59 having a valve 59a, a safety valve 59b, and a valve 59c is connected to the oil discharge pipe 50.

  As shown in FIG. 1, the other ends of the pressure relief pipes 49 and 59 are respectively connected to the gravity separation tank side of the cleaning communication pipe 26. When the apparatus is in operation, the valves 49a, 49c, 59a and 59c are normally open, and the gravity separation tank A and the liquid discharge pipe 40 or the oil discharge pipe 50 communicate with each other via the safety valves 49a and 59b. As a result, when the pressure of the liquid in the liquid discharge pipe 40 or the oil in the oil discharge pipe 50 exceeds a predetermined set pressure, the liquid or oil flows into the cleaning communication pipe 26 via the safety valves 49b and 59b, and piping due to pressure abnormality 40, 50 and reciprocating pumps 45, 55 can be avoided from being damaged.

  According to the oil-water separator having the above-described configuration, in the gravity separation tank A in which the mixed liquid of oil and water stays, gravity separation is performed in which oil having a small specific gravity floats upward and water having a large specific gravity sinks downward. . The water sinking below the gravity separation tank A flows into the communication tank B communicating with the lower part of the gravity separation tank A. The water that has flowed into the communication tank B overflows from the weir 4 of the communication tank B and is stored in the liquid tank C. On the other hand, the oil that has floated and separated above the gravity separation tank A reaches the surface of the mixed liquid, forms an oil film, and is collected by the oil receiver 13. The oil collected by the oil receiver 13 is supplied to the oil tank D through the side opening 13b. In this way, the oil / water separator according to the present embodiment can separate the mixed liquid with little mixing and stirring.

  And in the oil-water separator which concerns on this embodiment, since the supply pipe 2 is opening in the position lower than the height of the weir 4 of the gravity separation tank B, a liquid mixture is gravity separation tank A through the supply pipe 2 Supplied in the liquid. For this reason, when supplying to the gravity separation tank A, a liquid mixture is hardly mixed and stirred. As a result, it can be avoided that the mixed and stirred liquid is emulsified and the oil and water are hardly separated. The mixed liquid is supplied from the supply pipe 2 having a height close to the bottom portion away from the liquid surface of the gravity separation tank A. For this reason, it can suppress mixing and stirring the oil which floated on the liquid level with the flow of the supplied liquid mixture. Therefore, the oil-water separator according to the present embodiment can supply and separate the mixed liquid almost without mixing and stirring. For this reason, the oil-water separator which concerns on this embodiment can isolate | separate oil and water efficiently, without causing the emulsion of a liquid mixture.

  Furthermore, in the oil-water separator according to the present embodiment, compressed air is used to drive the reciprocating pumps 45 and 55, and all the electrical equipment such as the liquid bath liquid level gauge 11 is explosion-proof type. For this reason, the oil-water separator according to the present embodiment is connected to a device that handles highly flammable liquids such as gasoline, such as a crude oil distillation device or a gasoline desulfurization device, or is directly connected. Even if it is not adjacent to a device that may generate flammable gas or the like, there is little possibility of ignition and the operation can be performed safely.

  It goes without saying that the present invention is not limited to the embodiment described above. For example, although the oil / water separator 1 is partitioned to form the gravity separation tank A, the communication tank B, the liquid tank C, and the oil tank D, they may be provided independently.

  Further, the oil receiver 13 may be a dish or box instead of the bowl as shown in FIG. Further, the oil receiver 13 may be movable up and down, for example, without rotating and may be fixed.

  Further, the baffle plate 7 may be a bar shape or a box shape instead of a plate shape, and may be provided alone or in a plurality. Further, the present invention can be implemented without the baffle plate 7.

  In addition, air supplied from an air source is used as a power source for the ejector 29 and the reciprocating pumps 45 and 55. This air source may be a mobile air even if it is an air header installed in a factory. It may be a compressor. Further, depending on the specifications of the device, it is possible to use electric power supplied from a normal fixed power source or a mobile power generation device instead of air as a power source. In this case, the explosion-proof type is used for all the connection wiring to the device main body and the power source. Therefore, it is possible to deal with various utilities.

  It is an oil-water separator as shown in FIGS. 1-3, Comprising: Using the oil-water separator whose oil-water separator tank 1 is 2000 mm in height, width 2500 mm, and length 5000 mm, kerosene or light oil and water Oil / water separation was performed on the mixture. Table 1 shows the conditions and results of the examples.

  As shown in Table 1, the flow rate of the liquid mixture supplied to the oil / water separator was 5 t / h. In addition, the amount of oil contained in the mixed solution and the separated solution was expressed as a hexane extract (unit: mg / l).

Example 1
Oil-water separation was performed on a mixed solution containing 1530 mg / l of kerosene. As a result, the kerosene contained in the liquid after separation was 2 mg / l. As a separation rate between kerosene and water, 99.9% could be obtained.

(Example 2)
Oil-water separation was performed on a mixed solution containing 110,000 mg / l of light oil. As a result, the kerosene contained in the liquid after separation was 184 mg / l. As a separation rate between light oil and water, 99.8% could be obtained.

(Example 3)
Oil-water separation was performed on a mixed solution containing 185,000 mg / l of light oil. As a result, the kerosene contained in the liquid after separation was 1400 mg / l. As a separation rate between the light oil and the water, 99.2% could be obtained.

It is a top view which shows the oil-water separator which concerns on this invention. It is II sectional drawing of FIG. It is II-II sectional drawing of FIG. It is a perspective view which shows the oil-water separator which concerns on this invention. (A) It is a front view which shows the liquid tank strainer washing | cleaning device provided in the liquid tank. (B) FIG. 5 (a) is an enlarged cross-sectional view of a liquid tank strainer cleaner provided in the liquid tank. It is a perspective view which shows the oil receiver provided in the gravity separation tank. It is a piping diagram which shows the discharge pipe structure of an oil-water separator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Oil-water separation tank, 2 ... Supply pipe, 4 ... Weir, 5 ... Liquid discharge port (3rd tank discharge port), 6 ... Oil discharge port (3rd tank discharge port), 7 ... Baffle plate, 8 ... Liquid tank Strainer (third tank strainer), 9 ... Liquid tank strainer washer, 9a, 9b, 9c ... Nozzle (third tank strainer washing nozzle), 13 ... Oil receiver, 17 ... Oil tank strainer (fourth tank strainer), 18 ... oil tank strainer washer, 18a, 18b, 18c ... nozzle (fourth tank strainer washing nozzle), 29 ... ejector, A ... gravity separation tank (first tank), B ... communication tank (second tank), C ... liquid Tank (third tank), D ... oil tank (fourth tank).

Claims (6)

The first tank;
A supply pipe for supplying a mixed liquid of oil and water to the first tank;
A second tank having a weir for overflowing the liquid and communicating with the lower part of the first tank;
A third tank for storing liquid overflowing from the weir of the second tank;
An oil receiver that is provided in the first tank and collects the oil floating on the liquid surface of the first tank;
A fourth tank to which oil recovered by the oil receiver is supplied,
The said supply pipe | tube is an oil-water separator which is opened in the said 1st tank in the position lower than the height of the weir of the said 2nd tank.   2. The oil / water separator according to claim 1, wherein the supply port opens at a height closer to a bottom of the first tank than a height of the weir of the second tank. A third tank outlet for discharging the liquid in the third tank to the outside;
A third tank strainer provided in the third tank and filtering the liquid flowing into the third tank outlet;
A third tank strainer cleaning nozzle for injecting a cleaning liquid onto the third tank strainer;
A fourth tank outlet for discharging the liquid in the fourth tank to the outside;
A fourth tank strainer provided in the fourth tank and filtering the liquid flowing into the fourth tank outlet;
A fourth tank strainer cleaning nozzle for injecting a cleaning liquid onto the fourth tank strainer;
The oil-water separator according to claim 1 or 2, further comprising:   The oil / water separator according to claim 1, wherein the oil receiver is a bowl-shaped member and is supported so as to be rotatable around an axis of the bowl-shaped member.   The oil-water separator according to claim 1, further comprising an ejector that sucks gas in the first tank, the second tank, the third tank, and the fourth tank. The oil-water separator according to claim 1, wherein a baffle plate is provided in the first tank.

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