JPH0235906A - Waste oil purification device - Google Patents

Abstract

PURPOSE:To remove both of iron or the like and water included in waste oil and prevent piping or the like in reusing the oil from getting corroded by water by using a filter tank filled with a hydrophobic filter medium combinedly with a magnetic filter tank. CONSTITUTION:A magnetic medium 6 is filled in a casing 5 of a storage tank 1 for waste oil to be treated, and a magnetic filter 2 for removing iron content in which a permanent magnet 7 is disposed is connected with the outside of the casing 5, with which a filter tank 3 for removing water content constituted of a casing 9 equipped with a hydrophobic filter material 4 is connected forming a waste oil purification device. A magnetic substance and the like such as iron content and the like in the waste oil are removed by exciting the magnetic medium and having the waste oil go through a magnetic filter. The oil flowed out of the magnetic filter is fed into a filter tank filled with a hydrophobic filter medium, where water content is removed. As for the hydrophobic filter medium, a synthetic resin filter medium such as polyethylene, polypropylene or the like is used.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application in Industry A] The present invention relates to a waste oil purification device, and particularly to a waste oil purification device that can also remove moisture from waste oil.

[Prior Art] Many magnetic filters have been proposed as devices for purifying waste oil such as lubricating oil and hydraulic oil (for example,
7-190622). When filtering waste oil, a magnetic filter attracts and removes magnetic suspended matter by exciting a magnetic filter medium.

[Problems to be Solved by the Invention] Conventional magnetic filters cannot remove water from waste oil. For this reason, the water contained in waste oil is contained in the treated oil obtained by processing with a magnetic filter and is directly introduced into the internal combustion engine, etc., causing corrosion of the piping system. was.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems and provide a waste oil purification device that can also remove moisture from waste oil.

[Means for Solving the Problems] The waste oil purification device of the present invention includes a magnetic filter in which an excitable magnetic filter medium is installed, a filtration tank filled with a hydrophobic filter medium,
The present invention is characterized by comprising means for supplying treated oil for the magnetic filter to the filtration tank.

[Function] In the waste oil purification device of the present invention, waste oil is treated by exciting the magnetic filter medium and passing the waste oil through the magnetic filter, thereby removing magnetic suspended matter such as iron in the waste oil.

The oil spilled from the magnetic filter is supplied to a filtration tank filled with a hydrophobic filter medium, and the water contained therein is removed in this filtration tank.

[Examples] Examples of the present invention will be described below with reference to the drawings.

FIG. 1 is a system diagram showing an embodiment of the waste liquid treatment apparatus of the present invention. The illustrated device is a waste oil purification device for lubricating oil, hydraulic oil, etc. for internal combustion engines, and is equipped with a storage tank 1 for waste oil to be treated, a magnetic filter 2, and an A4 tank 3 filled with a hydrophobic filter medium 4. The storage tank 1 is connected to one end of the magnetic filter 2 via a pipe 11, a three-way cock V1, and a pipe 12. The other end of the magnetic filter 2 is connected to piping 13, three-way cock V2, and piping 1.
4, connected to one end of the filtration tank 3 via a three-way cock V3, piping 15, pump P, and piping 16. Three-way cock V
A pipe 17 branches off from 2, and the pipe 17 is connected to the other end of the filter iM tank 3 via a three-way cock V4 and a pipe 18. From the three-way cock V4 is the pipe 1 for taking out the treated oil.
9 are branched. Piping 2 from the three-way cock V
0 is branched, and the pipe 20 is connected to a three-way cock 3. Moreover, a pipe 21 including a three-way valve V5 is connected to the middle of the pipe 16.

The magnetic filter 2 has a casing 5 filled with a magnetic filter medium 6, and a permanent magnet 7 on the outer surface of the casing 5.
The south pole and the north pole are arranged to face each other. code 8
indicates a holder for supporting the permanent magnet 7.

fil A4ff 3 includes a casing 9 and a hydrophobic filter medium 4 provided within the casing 9.

In order to process waste oil using the above-mentioned embodiment device, first,
Three-way cock ■I, ■2 so that the flow path is in the direction of arrow A.
, V 3% V 4, the pump P is operated, and the waste oil in the storage tank 1 is supplied to the magnetic filter 2 through the pipes 11 and 12 and filtered. Then, the filtrate (processed oil) is further supplied to the filtration tank 3 through piping 13, 14, 15, 16 and filtered, and the obtained filtrate is taken out through piping 18.19 (the flow shown by arrow A in Fig. 1). reference).

In the magnetic filter 2, magnetic suspensions such as S in waste oil are removed.
S is efficiently adsorbed and removed by the magnetic filter medium 6 magnetized by the permanent magnet 7. The filtrate from the magnetic filter 2 is further filtered by a hydrophobic filter medium 4 in a filtration tank 3, and the water contained therein is efficiently removed.

In the apparatus of this embodiment, when magnetic suspended matter and the like accumulate in the magnetic filter medium 6 due to waste oil filtration processing and the filtration efficiency decreases, the supply of waste oil is stopped and the magnetic filter medium 6 is backwashed. Can be done.

In backwashing, first, the permanent magnet 7 is removed from the magnetic filter 2, and the magnetic filter medium 6 is demagnetized.

Then, three-way cock v so that the flow path of arrow B is configured.
Switch the flow paths of I, v2, ■3, and V4, operate pump P, and transfer oil for backwashing from filter tank 3 to pipe 18.1.
It is supplied to the magnetic filter 2 through 7.13, and the magnetic filter medium 6 is backwashed in an upward flow. Note that when backwashing the magnetic filter medium 6, the cleaning effect can be improved by blowing gas such as air or nitrogen into the casing 5. The backwash waste oil passes through piping 12, 20, 15, and 16 to filter a3.
and is filtered through a hydrophobic filter medium 4 to remove SS. The SS in the backwash waste oil from the magnetic filter 2 is mainly from the magnetic filter medium 6 of the magnetic filter 2! ! However, since this peeled material has already been aggregated to some extent or sufficiently, it can be efficiently removed by filtration using the hydrophobic filter medium 4. That is, the hydrophobic filter medium 4 has low resistance to liquid passage and high collection efficiency.

The clean oil that has passed through the hydrophobic filter medium 4 is transferred to the pipe 18.
17.13 and may be recirculated to backwash.

The hydrophobic filter medium 4 in the filter tank 3 may be discarded and replaced with a new one each time waste oil treatment is switched to backwashing (for example, after backwashing is completed). In the case of continuous use, it is preferable to provide the filtration tank 3 with a drain valve and use it after draining the water. Note that the hydrophobic filter medium 4 in which SS has accumulated due to the filtration treatment of backwash waste oil may be recycled and reused.

After backwashing the magnetic filter medium 6, the permanent magnet 7 is attached again and waste oil can be processed according to the above-described operation.

In such a waste oil purification apparatus of the present invention, the magnetic filter medium filled in the magnetic filter may be made of stainless steel, soft mould, [1, permalloy, cobalt, nickel,
Alnico, ferrite, etc. can be used, and their shapes include spherical, granular, rod-like, scale-like, cotton-like, coil-like, ribbon-like, powder-like, woven-like, mesh-like, and fibrous-like. It can be any shape.

As a magnet for magnetizing such En filter media,
In addition to permanent magnets as shown in FIG. 1, electromagnets can also be used. Magnetic filters using permanent magnets have the advantage of reducing the electricity costs required to operate the device.On the other hand, electromagnetic filters using electromagnets can demagnetize the magnetic filter media by simply turning off the electricity without removing the magnets. This has the advantage that backwashing can be easily performed.

As the hydrophobic filter material for the filter J4, synthetic resin filter materials such as polyethylene, polypropylene, fluororesin, nylon, polysulfone, etc. can be used. There is no particular restriction on the form of the filter material, and it may be a laminate, a membrane, or It is possible to employ a filter in which pieces of filter media are randomly filled.

According to the waste oil purification device shown in Fig. 1, the magnetic filter can be backwashed, and the backwashed waste oil can be cleaned!
Since it is overtreated and becomes clean, it also has the advantage of being able to be discharged as is, or returned to the magnetic filter and used for backwashing.

The device shown in FIG. 1 is an embodiment of the present invention, and the present invention is not limited to the illustrated example unless it exceeds the gist of the invention. It is possible to adopt various other aspects also in the direction of .

For example, it is preferable that the direction of oil passage through the filter tank 3 is appropriately set depending on the specific gravity of the waste oil. For example, in the case of waste oil that has a higher specific gravity than water, it is preferable to pass the oil in a downward flow as shown in Figure 1, but in the case of waste oil that has a lower specific gravity than water, it is preferable to pass the oil in an upward flow. Is it preferable to do so?

[Effects of the Invention] As detailed above, the waste oil purification device of the present invention can reduce waste oil by filtering waste oil such as lubricating oil or hydraulic oil using a magnetic filter, and then filtering it using a hydrophobic filter medium. Highly clean purified oil that can be easily reused can be recovered. Since the recovered purified oil has not only SS etc. but also moisture removed to a high degree, there is no risk of corrosion of pipes etc. when it is reused.

The waste oil purification device of the present invention is easy to operate, has high processing efficiency, and can be downsized, so it is extremely useful as a small, high-performance waste oil regenerating device installed at gas stations and the like.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing an embodiment of the waste oil purification apparatus of the present invention. 1...Storage tank, 2...Magnetic filter, 3...
filtration tank. Agent Patent Attorney Tsuyoshi Shigeno Figure 1 A-゛During filtration B-111 During backwashing

Claims (1)

[Claims] (1) Waste oil purification characterized by comprising a magnetic filter containing an excitationable magnetic filter medium, a filtration tank filled with a hydrophobic filter medium, and a means for supplying treated oil of the magnetic filter to the filtration tank. Device.