JPH0621521Y2 - Oil water separator - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for separating oil-containing water or seawater (hereinafter simply referred to as raw water) such as bilge in a ship into water and oil.

[0002]

2. Description of the Related Art In general, oily water is separated by. Gravity separation method using the difference in specific gravity between oil and water ,. An oil coarsening method for coarsening oil, and. There is a method such as an adsorption collection method in which oil is adsorbed and collected on a layer such as activated carbon or fibers. For example, JP-B-58-41887 or JP-B-55-16687 as a prior art discloses that a combination of three components of an oil coarse-grained fiber layer, a gravity separation chamber and an adsorption collection fiber layer is used. is suggesting.

[0003]

However, the separation method of this prior art is such that the fine oil still remaining in the raw water is obtained by separating the oil by passing the raw water through the gravity separation chamber and the oil coarse-grained fiber layer. The droplets are finally adsorbed and collected in the tissue of the adsorption and collection fiber layer in the tissue of the adsorption and collection fiber layer, and the oil content is sequentially accumulated in the tissue of the adsorption and collection fiber layer. Therefore, clogging occurs in the adsorbing and collecting fiber layer, and the passage resistance when raw water passes through the adsorbing and collecting fiber layer increases rapidly, and the oil content accumulated in the tissue is constant. When the amount exceeds the amount, the minute oil droplets in the raw water pass through the adsorption / collection fiber layer together with the treated water without being adsorbed / collected by the adsorption / collection fiber layer. It is impossible to operate for a period of time, There is a problem in that must frequently perform a reproduction operation for cleaning remove oil that has been adsorbed and collected in the tissue of fibrous layer.

This problem is particularly remarkable in the case of raw water having a high oil content or in the case of raw water containing an oil having a high viscosity such as C heavy oil. Further, in another prior art, Japanese Patent Laid-Open No. 53-54176, an oil-water separation cloth having water permeability is used, and one surface of the oil-water separation cloth is contacted with oil-containing water to separate the oil-water separation. It is described that the oil content is separated from the water content on one surface of the work cloth, and the water content is drained from the other surface of the cloth for oil / water separation.

However, solids and the like floating in the oil-containing water adhere and accumulate on one surface of the oil-water separation cloth. As the amount of solids and the like adhered to the one surface increases, the water is separated from the oil-water separation cloth. Since the passage resistance required for permeating the cloth is increased, the pressure of the oil-containing water acting on one surface of the oil-water separating cloth is increased. Then, when the pressure of the oil-containing water acting on one surface of the oil-water separation cloth increases, this pressure causes the oil component separated on the one surface of the oil-water separation cloth to permeate the oil-water separation cloth. In addition, it cannot be operated for a long period of time with high separation efficiency.

The present invention uses a porous membrane made of a material having water-repellent and oil-repellent properties for the final separation of oil, and enables separation to be continuously operated for a long time with high separation efficiency. It is a technical challenge to provide a device.

[0007]

In order to achieve this technical object, the present invention proposes a cylindrical partition body having a bottom plate on the outer periphery in the upper layer portion of a hermetically sealed container, the axis of which extends vertically. It is provided so as to extend so as to form an annular gravity separation chamber on the outside of the cylindrical partition body, and a raw water supply pipe is tangentially connected to the side surface of the gravity separation chamber and a sludge outlet is provided at the bottom. While opening, the middle layer in the container is an oil coarsening layer that is made porous by fibers of metal or synthetic resin, and the inside of the container is the upper and lower layers in the oil coarsening layer. And a bottom plate formed in a cylindrical shape with a porous film made of a material having water-repellent and oil-repellent properties in the lower layer portion below the oil coarse-grained layer. The coarsely crushed oil content has its axis extending vertically and A structure in which the inside is provided so as to communicate with the lower surface side of the oil coarsened layer, and further, the container is provided with a treated water outlet pipe at the bottom of the lower layer and an oil outlet pipe at the top of the upper layer. I chose

[0008]

[Operation] In this configuration, when the raw water flowing into the gravity separation chamber from the tangential supply pipe flows in the gravity separation chamber in the circumferential direction, the sludge contained in the raw water settles and separates at the bottom of the gravity separation chamber. After that, the coarse oil droplets in the raw water are floated and separated toward the top of the container while being discharged from the sludge outlet to the outside of the vessel.

In the raw water from which the sludge and the coarse oil droplets have been separated in the gravity separation chamber in this manner, when the raw water flows down through the inside of the cylindrical partition body, the oil component floats and separates toward the top of the container, Next, when reaching the location of the oil coarse-grained layer and passing through the oil coarse-grained layer, relatively small oil droplets that could not be separated in the gravity separation chamber and the cylindrical partition body are aggregated with each other to form a coarse particle. By growing into oil droplets, through the inside of the cylindrical partition,
Float separated towards the top in the container.

Then, the raw water after passing through the oil coarse-grained layer flows into the oil coarse-grained body formed into a cylindrical shape by the porous membrane, and then the porous membrane in the oil coarse-grained body is discharged. pass. At this time, since the porous membrane is made of a material having an oil-repellent property, the minute oil droplets that could not be separated in the gravity separation chamber, the cylindrical partition body and the oil coarsened layer were separated from raw water. When trying to pass through the porous film together, the action of the oil repellency of the porous film causes them to aggregate with each other on the inner surface of the porous film to grow into coarse oil droplets. It peels off from the inner surface and floats toward the oil coarse-grained layer, and then grows into larger oil droplets in this oil coarse-grained layer, and then floats and separates toward the top of the container. The separated raw water is discharged from the treated water outlet pipe at the bottom of the container to the outside of the container, while the oil component floated and separated at the top of the container is discharged to the outside of the container from the oil outlet pipe.

The coarsened oil fraction for the final separation of the oil fraction is formed into a cylindrical shape by a porous film made of a material having water-repellent and oil-repellent properties, and its axis is in the vertical direction. By arranging so as to extend to, the fine oil droplets in the raw water do not pass through the porous membrane and agglomerate with each other on the inner surface of the porous membrane to become coarse, while the inner surface of this porous membrane The coarse oil droplets are easily separated from the inner surface of the porous membrane and float up because the inner surface is oriented vertically, and the raw water passing through the porous membrane is Since the sludge and large oil droplets are almost completely removed in the gravity separation chamber and the coarse-grained oil layer, the occurrence of clogging in the porous membrane can be reliably improved. The passage resistance when It can greatly reduce the increase with the lapse of time.

[0012]

As described above, according to the present invention, the oil content and the sludge in the raw water are first separated by the gravity separation method, and then by the fibrous oil coarse-grained layer, and the oil content is finally finely separated. And a porous film made of a material having an oil repellent property, and it is possible to prevent the passage resistance of the raw water to the porous film from rapidly increasing with the passage of time, and to prevent water in the porous film from increasing. Since swelling due to oil penetration can be prevented and durability is high, its separation efficiency can be improved and operation due to high separation efficiency can be maintained for a long period of time. In some cases, or when the oil content is high, a remarkable effect can be exhibited.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, reference numeral 1 indicates a closed container, and the container 1
Is configured by detachably joining the upper container 1a and the lower container 1b at the flange portion 1c, and the oil outlet pipe 2 is opened at the top of the upper container 1a.

The reference numeral 3 is formed on the outside of the cylindrical partition body 4 by providing a cylindrical partition body 4 having a bottom plate on the outer peripheral surface in the upper container 1a so that its axis extends vertically. In the gravity separation chamber 3, a raw water supply pipe 5 is tangentially opened, and the through hole 6 formed in the cylindrical partition 4 and the raw water supply pipe 5 are shown. A partition plate 7 is provided to divide the raw water from the raw water supply pipe 5 into the gravity separation chamber 3 in the circumferential direction, and then enters the cylindrical partition body 4 from the through hole 6. To configure.

A weir plate 8 is provided in the gravity separation chamber 3 so that raw water flowing in the gravity separation chamber 3 can flow over. In the lower part of the gravity separation chamber 3 in the upper container 1a, for example, 250 to 30 metal fibers having a wire diameter of 20 to 70 microns are used.
A fibrous oil coarse-grained layer 9 is provided which is packed to a thickness of 30 to 100 mm at a packing density of 0 kg / m ³ . The oil coarse-grained layer 9 may be made of synthetic resin fibers instead of being made of metal fibers, and the oil coarse-grained layer 9 has a large wire diameter. You may make it a laminated type by stacking a thin wire on the upper surface.

Further, in the lower container 1b, a cylindrical oil-particle coarse grain is detachably attached to a partition plate 10 which is detachably inserted into a joint flange 1c of the upper container 1a and the lower container 1b. The body 11 is arranged such that its axis extends in the up-down direction, and the inside thereof is largely communicated with the oil coarse-grained layer 9, and the lower container 1
The outlet pipe 12 of the treated water is connected to the bottom of b.

The cylindrical oil-grain coarsened body 11 has a porous membrane 13 made of a material having water-repellent and oil-repellent properties such as polyethylene terephthalate, and a holding inner cylinder 14 made of a perforated plate such as a wire mesh. And a holding outer cylinder 15 made of a perforated plate such as a wire mesh fitted on the outer side of the holding inner cylinder 14 to form a cylindrical cartridge shape. The cylinder 15 has an oil outlet hole 16 on the ceiling surface.
Is removably fastened to a header 18 having a raw water inflow hole 17 on its side surface by a stay bolt 19, and
The header 18 is attached to the partition plate 10 with bolts 2
It is configured to be detachably attached at 0. Further, a bottom plate for closing the inside is provided at the lower end of the cylindrical oil content coarsening body 11.

In this case, in order to increase the surface area of the porous film 13 in the oil-grain-roughened body 11, the oil-grain-roughened body 11 formed into the cylindrical cartridge shape as described above.
Or a plurality of porous membranes 13
May be bent in a zigzag shape as shown in FIG. Further, an oil level detection sensor 21 is provided in the upper part of the upper container 1a, and when the oil level detection sensor 21 senses the oil level, the solenoid valve 22 in the oil outlet pipe 2 is configured to open. The oil outlet 23 provided on the lower side of the fibrous oil coarse-grained layer 9 is provided with a pipe line 26 equipped with a valve 24 and a check valve 25.
Oil outlet pipe 2 with a valve 27 on the upper portion of the lower container 1b, and a sludge outlet pipe 30 with a valve 29 on the bottom of the gravity separation chamber 3 while being connected to the oil outlet pipe 2 via Set up.

In this structure, when the raw water flowing into the gravity separation chamber 3 through the raw water supply pipe 5 flows in the gravity separation chamber 3 in the circumferential direction, the sludge contained in the raw water is stored in the gravity separation chamber 3. The sediment is separated at the bottom and is periodically discharged from the sludge outlet pipe 30 with the valve 29 to the outside of the vessel, while the coarse oil droplets in the raw water are floated and separated toward the top in the upper container 1a.

The raw water from which the sludge and the coarse oil droplets have been separated in the gravity separation chamber 3 as described above flows into the cylindrical partition body 4 through the through hole 6 provided in the cylindrical partition body 4, Even when descending in the cylindrical partition body 4, the oil droplets are floated and separated toward the top of the upper container 1a.
The oil that has floated to the top of the upper container 1a is discharged outside the device by opening the solenoid valve 22 in the oil outlet pipe 2 in accordance with the detection of the oil level by the oil level detection sensor 21.

On the other hand, when the raw water descending in the cylindrical partition body 4 passes through the fibrous oil coarse-grained layer 9 provided in the lower part of the gravity separation chamber 3, the raw water is in the gravity separation chamber 3 and in the cylindrical shape. The relatively small oil droplets that could not be separated in the partition body 4 aggregate with each other to grow into coarse oil droplets,
It floats and separates toward the top of the upper container 1a. The raw water that has passed through the fibrous oil-grain coarsening layer 9 is discharged from the inlet hole 17 in the header 18 into the cylindrical oil-grain coarsening body 1.
1 inside the porous membrane 13 and the porous membrane 1
Pass 3.

At this time, since the porous film 13 is made of a material having an oil repellency, the gravity separation chamber 3, the cylindrical partition 4 and the fibrous oil coarse-grained layer are formed. The micro oil droplets that could not be separated in 9 are aggregated with each other on the surface of the porous film 13 due to the action of oil repellency of the porous film when passing through the porous film 13, and grow into coarse oil droplets. As a result, the oil can be finely separated, and the treated water after the fine separation of the oil is discharged from the outlet pipe 12 to the outside of the device, while the porous membrane 1
The coarse oil droplets on the inner surface of
Through the oil outflow holes 16 in the porous membrane 1
The oil droplets coarsened on the outer surface of No. 3 float toward the lower side surface of the partition plate 10, and then the oil outlet pipe 28 with the valve 27 is provided.
Is regularly discharged from the container.

The oil accumulated on the lower side surface of the fibrous oil coarse-grained layer 9 is discharged from the oil outlet pipe 2 through the pipe line 26 to the outside of the device by periodically opening the valve 24. Yes,
In this case, the check valve 25 provided in the pipeline 26 is
When the solenoid valve 22 in the oil outlet pipe 2 is closed, the valve 24
This is for preventing the oil accumulated at the top of the upper container 1a from flowing into the lower side surface of the fibrous oil grain coarsening layer 9 when opened.

According to an experiment conducted by the present inventor, a separation test was conducted on raw water mixed with C heavy oil and raw water mixed with light oil by using the above apparatus, and the separation test was conducted before entering the fibrous oil coarse-grained layer 9. Oil content concentration (ppm) at location A, oil content concentration at location B (ppm) after passing through the fibrous oil coarse-grained layer 9
), And the oil content concentration (ppm) at point C after passing through the porous membrane 13 in the oil coarsened body 11 are shown in Table 1.

[0025]

[Table 1]

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of a separating device according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a sectional view of the same portion as FIG. 3 in another embodiment.

[Explanation of symbols]

 1 Closed Container 1a Upper Container 1b Lower Container 2 Oil Outlet Pipe 3 Gravity Separation Chamber 4 Cylindrical Partition 5 Raw Water Supply Pipe 9 Oil Coarse Graining Layer 11 Oil Coarse Graining Part 13 Porous Membrane 12 Treated Water Outlet Pipe 30 Sludge exit

Claims (1)

[Scope of utility model registration request] 1. An upper layer portion in a closed container (1),
A cylindrical partition body (4) having a bottom plate on its outer periphery is provided so that its axis extends vertically, and an annular gravity separation chamber (3) is formed outside the cylindrical partition body (4). , The gravity separation chamber (3) has a raw water supply pipe (5) on its side surface.
Tangentially and connect the sludge outlet (3
0) is opened, while an oil coarse-grained layer (9) made porous by fibers of metal or synthetic resin is provided in the middle layer in the container (1). ) Is provided so as to divide the inside of the container (1) into the upper layer portion and the lower layer portion, and the lower layer portion below the oil coarsening layer (9) has a material having water repellency and oil repellency. The oil coarse-grained body (11), which is formed into a cylindrical shape with a porous membrane (13) made of aluminum and has a bottom plate, has its axis extending vertically and the inside thereof has the oil coarse-grained layer ( 9) is provided so as to communicate with the lower surface side, and further, the container (1) has a treated water outlet pipe (12) at the bottom of the lower layer and an oil outlet pipe (2) at the top of the upper layer. An oil-water separation device, characterized in that each is provided with.