JPH07284606A - Oil-water separator - Google Patents

Abstract

PURPOSE:To gravitationally separate oil and water by means of the magnetic flux and to discharge the floated oil through an oil adsorbent bed by passing a liq. to be separated supplied to a separation tank through the magnetic fields of a magnetic system. CONSTITUTION:The liq. to be separated supplied into a holding frame 7 from a feed pipw 9 is introduced into a lidded cylinder 2 through a liq. passage hole 6. In this case, the liq. crosses the magnetic fields of the permanent magnets 8 of a magnetic system 5, hence the combination of the oil moleculae and water molecule in the liq. is gravitationally unbalanced by means of the magnetic flux, and both molecules are separated. The oil molecules are then passed through the narrow void of a mesh layer 4 stuck to the cylinder 2, and the separated oil molecules are flocculated together and delivered into a separation tank 1. As a result, the oil in the tank 1 is floated up, adsorbed by an adsorbent bed 10, oozed out on the upper surface and discharged from an oil outlet 11. The water having a higher sp.gr. is discharged from a water outlet 12 at the lower part of the separation tank.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil / water separator for separating oil and water from an aqueous liquid mixed with oil.

[0002]

2. Description of the Related Art Oil and water-like liquids (simply water) are used as an oil / water separator for removing oil mixed in liquids, such as when recovering and reusing a CFC substitute liquid used for cleaning machine parts. A device for floating and separating the oil component by utilizing the difference in specific gravity is known, and in such a device, the floating oil is caused to overflow from the upper end of the partition plate and the oil component overflowing to the outside of the partition plate is After collecting and floating the oil, the water content is discharged from below the separation tank.

However, in order to effectively separate and float the oil and maintain the boundary between the floating oil and water, it is necessary to prevent the liquid in the tank from being agitated.
In Japanese Patent Publication No. 205, a plunger body such as a diaphragm pump is provided above the separation tank to suck and discharge the liquid, and the stirring of the liquid to be separated by the homp is reduced to prevent the floating oil component from swinging. There is.

Further, in order to separate the oil component, it is necessary to make sure that only the oil component overflows from the partition plate. Therefore, the upper end position of the partition plate to which the oil component overflows is a position where water does not always overflow. However, it is difficult to change the upper end position of the partition plate according to the change of the interface between the floating oil and water. Therefore, JP-A-2-102
In No. 782, a cylindrical oil adsorbent is suspended in the separation tank,
It is proposed that the oil that has exuded into the hollow of the oil adsorbent is taken out by a pipe that opens into the hollow.

Further, when air is mixed into the liquid to be separated to attach oil or a DC voltage is applied, the oil molecules are ionized and pass through an adsorbent having a narrow gap surrounded by mesh electrodes of positive potential. At times, methods such as making particles large by electrostatic coagulation and facilitating floating are performed.

[0006]

However, there is a drawback that the efficiency of sucking and discharging the liquid to be separated by the plunger is inferior, and an oil adsorbent that floats in the separation tank is provided in order to remove the floating oil. This has the drawback of complicating the structure. In addition, in order to apply air or DC voltage to float the oil molecules, it is necessary not only to install a power supply device in a separate compressor or separated liquid, but also to use an electric device in an oil environment, There is a danger of oil catching fire. The present invention provides an apparatus for solving these problems with a simple structure.

[0007]

Therefore, when the liquid to be separated supplied to the separation tank is passed through the magnetic field of a magnet device composed of a permanent magnet or an electromagnet, the difference in specific gravity between the oil and water is caused by the action of the lines of magnetic force. The oil content floating in the separation tank is leached to the upper surface of the separation tank via the oil adsorbent layer above the separation tank, and the leached oil content is discharged.

It should be noted that a capped cylindrical body having a mesh layer with a narrow gap is provided in the separation tank, a holding frame for holding a magnet device made of a permanent magnet is provided inside the capped cylindrical body, and the cap is supplied into the holding frame. The liquid to be separated is sent into the cylinder with a lid through the magnetic field of the permanent magnet, the oil is aggregated through the mesh layer provided in the cylinder with the lid, and the oil is levitated in the separation tank. The adsorbed oil is exuded on the layer, the exuded oil is discharged as it is, and the water having a large specific gravity is discharged from the lower part of the separation tank. In this case, in order to prevent the oil that is rising in the tank from being sucked from the water outlet, a partition plate is provided facing the water outlet, and the upper end of the partition plate is placed sufficiently below the floating oil to separate the partition. It suffices if only the water overflows from the upper end of the plate so as to be separated from the upward flow in the separation tank.

A magnet device may be provided in the lower part of the separation tank to supply the liquid to be separated, and a mesh layer may be provided in the upper part of the magnet device to float the oil. Further, it is also possible to dispose the magnet device around the supply pipe for supplying the liquid to be separated to the separation tank without providing the magnet device inside the separation tank and to make the magnetic force lines act inside the supply pipe. In this case, the magnet device is composed of an electromagnet. can do.

[0010]

With this configuration, the liquid to be separated supplied to the separation tank is first subjected to the action of magnetic lines of force through the magnetic field of the magnet device, and the balance of oil content in the liquid is balanced by the difference in specific gravity between oil and water. It is broken down and separated into oil and water, and the oil molecules are aggregated by passing through a narrow mesh layer and floated above the separation tank. The floating oil is adsorbed by the oil adsorbent layer above the separation tank and exudes to the upper surface of the oil adsorbent layer. The exuded oil is discharged from the upper part of the oil adsorbent layer and does not contain oil from the lower part of the separation tank. Water is discharged.

[0011]

EXAMPLE An example shown in FIGS. 1 and 2 will be described below. Reference numeral 1 is a separation tank, and 2 is a cylindrical body with a lid, which has a large number of liquid passage holes 3 in the periphery thereof, and a mesh layer 4 is attached to the inside thereof. The mesh layer 4 forms a narrow liquid passage gap, for example, by randomly entwining thin metal wires or synthetic resin fibers, or by overlapping punching metals with each other by shifting them. Reference numeral 5 denotes a magnet device provided inside the covered cylindrical body, which is provided with a holding frame 7 having several liquid passage holes 6 elongated in the longitudinal direction, and a permanent magnet is provided along the liquid passage holes on the inner surfaces of the liquid passage holes. 8 is attached to form a magnetic field φ between adjacent permanent magnets.

Reference numeral 9 is a supply pipe for the liquid to be separated, which is opened at the bottom of the holding frame 7, and 10 is an oil adsorbent layer provided on the upper part of the separation tank 1, for example, a nonwoven fabric of polypropylene fiber is laminated. 11 is an oil extraction port provided above the oil adsorbent layer 10 of the separation tank 1, 12 is a water extraction port provided below the separation tank,
Reference numeral 13 is a valve, 14 is a partition plate provided between the covered tubular body 2 and the water outlet 12, and 15 is a preservative attached to the inside of the covered tubular body 2 as needed, and is made of a holding frame such as ceramic or charcoal. It is attached to the outer peripheral surface.

The liquid to be separated supplied from the supply pipe 9 into the holding frame 7 is supplied from the liquid passage hole 6 of the holding frame 7 to the inside of the cylindrical body 2 with a cover, and when passing through the liquid passage hole 6, the magnet device is provided. The magnetic field φ between the permanent magnets 5 of 5 is crossed, and the binding balance between the water molecules in the liquid and the oil molecules attached to the liquid is disrupted due to the effect of the lines of magnetic force, and the separated oil molecules are separated. After passing through the narrow gap of the mesh layer 4 attached to the, the separated oil molecules are aggregated and sent out into the separation tank. The oil content in the separation tank 1 floats up and is adsorbed by the oil adsorbent layer 10, exudes on the upper surface thereof, and is discharged from the oil content outlet 11, and the water having a large specific gravity is discharged from the bottom of the separation tank to the water outlet 12. Is discharged through the valve 13.

Incidentally, a partition plate 14 is provided so that the water exceeding the upper end can be lowered to the outside so as not to suck up the oil that comes out of the liquid passage hole 3 of the covered cylindrical body 2 at the time of discharging the water. Is good. Further, if the pipe of the water outlet 12 is bent up to the position of the oil adsorbent layer 10 to form a separation tank and a U-shaped pipe, the liquid to be separated naturally flows out along with the supply of the liquid to be separated from the supply pipe 9. However, the valve 13 may not be provided. In addition, when the liquid to be separated is a plant or the like and is putrefaction, it is desirable to provide the antiseptic material 15 in the covered cylinder, and the installation position is not limited to this embodiment.

FIG. 3 shows another embodiment, in which the magnet device 5 and the mesh layer 4 in FIG. 1 are arranged in the radial direction in the longitudinal direction, and the portion having the same function as in FIG. Are given the same reference numerals.

The liquid to be separated supplied from the supply pipe 9 traverses the magnetic field φ of the permanent magnet 8 attached to the holding frame 7 and is supplied to the middle chamber 16 from the liquid passage hole 6, and a large number of liquids flow to the upper part of the middle chamber. Hole 3
Is provided with the intermediate plate 17 and the oil component is passed from the liquid passage hole 3 through the mesh layer 4 attached to the intermediate plate 17 to the separation tank 1.
Float to the top of the. The floating oil component is adsorbed by the oil adsorbent layer 10, exudes on the upper surface thereof, and is discharged from the oil component outlet 11, and moisture is discharged from the moisture outlet 12 after passing through the partition plate 18. The permanent magnet 8 is not limited to the arrangement shown in the figure, and the liquid to be separated passing through the liquid passage hole 6 may cross the magnetic field φ. Further, as the liquid passage hole 6, an appropriate hole such as a long hole, a round hole or a square hole can be used.

FIGS. 4 and 5 show different embodiments of the magnet device 5, in which a non-magnetic supply pipe 9 is provided in a portion of the supply pipe 9 for supplying the liquid to be separated to the separation tank 1 close to the separation tank. A magnetic field φ is formed in the supply pipe 9 by surrounding it with a permanent magnet 8 and the liquid to be separated passing through this supply pipe 9 is subjected to the action of magnetic force lines when passing through this magnetic field, and the specific gravity of oil and water is increased. Due to the difference, the water molecules in the liquid and the oil molecules adhering to each other are supplied into the lidded cylindrical body 2 below the separation tank 1 in a state in which the binding balance of the oil molecules is disrupted. In this embodiment, the permanent magnets 8 of the magnet device 5 are provided in two stages, and the magnetic field lines effectively act on the liquid to be separated in the supply pipe 9 by mutually changing the directions of the magnetic field φ. The magnet device is not limited to two stages. In this way, the magnet device 5
By providing the outside of the separation tank 1, the structure inside the separation tank is simplified and the magnet device does not come into contact with the liquid to be separated, so that an electromagnet can be used for the magnet device.

[0018]

As described above, the present invention separates an oil-water mixed liquid to be separated into an upper-layer oil content and a lower-layer water content according to the difference in specific gravity between the oil content and the water content, and an oil-water separation provided with a separate tank for discharging them separately. In the device, the liquid to be separated, which is to be supplied to the separation tank, is passed through the magnetic field of the magnet device to disrupt the mutual balance due to the difference in the specific gravity of oil and water due to the action of the lines of magnetic force, and to separate the oil that floats above the separation tank. Is leached to the upper surface through the oil adsorbent layer and discharged, so that it is not necessary to apply a voltage to the air or the liquid to be separated to ionize it, and effective separation can be performed with a simple structure.

Further, since the separated oil content is exuded to the upper surface of the oil adsorbent layer and discharged, the oil content discharged by stirring or shaking of the liquid in the separation tank is not mixed with water, and is separated from the oil content. There is no need to consider the position of the boundary line with water, and there is an effect that reliable separation can be obtained.

The same effect can be obtained even if the magnet device and the mesh layer in the separation tank are formed in a tubular shape and arranged in the radial direction of the separation tank, or in the form of a plate arranged vertically. The radial direction can increase the effective area of the magnet device and the mesh layer, and the vertical direction can simplify the configuration, and each can be provided in multiple stages.

Further, the supply pipe for supplying the liquid to be separated is made of a non-magnetic material, and the magnet device is provided so as to surround the supply pipe, so that the magnet device can be provided separately from the liquid to be separated. Not only magnets but also electromagnets are used, and there is no danger of oil igniting, and maintenance is easy.

Further, if a partition plate is provided so as to face the moisture outlet in the lower part of the separation tank so that the moisture overflows from the upper end and is discharged, it is possible to prevent the rising oil component from being discharged together with the moisture. The effect is obtained.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a side sectional view showing another embodiment.

FIG. 4 is a side sectional view showing still another embodiment, with the upper part omitted.

5 is an enlarged cross-sectional view taken along the line BB of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Separation tank 2 Covered cylindrical body 3 Liquid passage hole 4 Mesh layer 5 Magnet device 6 Liquid passage hole 7 Holding frame 8 Permanent magnet 9 Supply pipe 10 Oil adsorbent layer 11 Oil extraction port 12 Moisture extraction port 13 Valve 14 Partition plate 15 Antiseptic Material 16 Middle chamber 17 Middle plate 18 Partition plate

Claims (6)

[Claims] 1. An oil-water separator having a separation tank for separating an oil-water mixed liquid to be separated into an upper-layer oil content and a lower-layer water content according to the difference in specific gravity between the oil content and the water content, and supplying the separated water to the separation tank. The liquid to be separated is passed through the magnetic field of the magnet device to break the balance due to the difference in specific gravity between the oil and water, and the oil is floated in the separation tank through the oil adsorbent layer above the separation tank. An oil / water separator characterized by being discharged. 2. A separation cylinder is provided with a capped cylindrical body having a narrow mesh layer in the lower part of the separation tank, and a holding frame arranged inside the capped cylindrical body for holding a permanent magnet, to separate the liquid to be separated from the permanent magnet. The oil-water separation device according to claim 1, wherein the oil-water separation device is supplied to the inside of the covered cylinder through a magnetic field, and the oil is floated above the separation tank through a mesh layer. 3. A magnet device comprising a permanent magnet is provided at the bottom of the separation tank, and the liquid to be separated which has passed through the magnetic field of the magnet device passes oil through a narrow mesh layer provided on the top of the magnet device. The oil-water separator according to claim 1, wherein the oil-water separator is floated on the surface. 4. A supply pipe for supplying the liquid to be separated into the separation tank is made of a non-magnetic material, and a magnet device surrounding the supply pipe is provided so that the liquid to be separated in the supply pipe passes through the magnetic field of the magnet device. The oil-water separator according to claim 1. 5. The oil-water separator according to claim 4, wherein the magnet device is a permanent magnet. 6. The oil-water separator according to claim 4, wherein the magnet device is an electromagnet.