JPS64104B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for treating contaminated oil containing a large amount of water and contaminants. The presence of contaminants in lubricating oils and hydraulic fluids can cause various problems such as machine breakdowns and oil leaks, so it is desirable that these oils be highly purified. As methods for purifying oil, methods using filters, methods using centrifuges, methods using electrostatic oil purifiers, etc. are known, but each of these methods has advantages and disadvantages. In other words, ordinary filters have the drawback of not being able to remove fine contaminant particles and moisture, and moreover, being easily clogged. Although centrifugal separators are suitable for removing relatively large contaminant particles, they have the disadvantage that they cannot completely remove emulsified water and cannot remove fine contaminant particles. .
Electrostatic oil purifiers have the advantage of being able to remove even the smallest contaminant particles, but they cannot purify oil when a large amount of moisture is present, and they are difficult to clean when attempting to clean oil at a high level. has drawbacks such as the need to process the oil cyclically. The present invention is based on the above considerations, and includes:
The object of the present invention is to provide an oil treatment method that can highly normalize contaminated oil containing large amounts of water and pollutants. Therefore, in the oil treatment method of the present invention, an electric field is applied to oil using an electric field charger, the oil to which the electric field has been applied is sent to a centrifugal separator through a communication pipe, and is processed by the centrifugal separator. The treated oil is sent via a communication pipe to a water removal device where water is removed using water-absorbing fibers, treated by the water removal device, and the oil treated by the water removal device is communicated. It is characterized by being sent to an electrostatic oil purifier via a pipe and processed by the electrostatic oil purifier. Hereinafter, the present invention will be explained with reference to the drawings. Fig. 1 is a diagram showing one embodiment of the oil treatment system of the present invention, Fig. 2 is a diagram showing the separation characteristics between the stock solution and the processing liquid in a centrifuge, and Fig. 3 is a diagram showing the separation characteristics of the stock solution and the processing solution in a centrifugal separator. FIG. 3 is a diagram illustrating the growth of particles. In FIG. 1, 1 is an electric field charger, 2 is a centrifugal separator, 3 is a water removal device, 4 is an electrostatic oil purifier, and 5 is a communication pipe. The oil treatment system of the present invention includes an electric field charger 1, a centrifugal separator 2, a water removal device 3, an electrostatic oil purifier 4, and a communication pipe 5 connecting the devices. The electric field charger 1 has a container and a plurality of electrodes arranged inside the container. When a tank is filled with oil and a DC or AC voltage is applied between opposing electrodes, an electric field acts on the oil. When an electric field acts on oil, contaminant particles and water particles in the oil grow. Figure 3 A, B, and C show the growth of water particles in oil, and Figure 3 A is 1.
Figure 3 (b) shows water particles when an electric field is applied for 5 minutes, and Figure 3 (c) shows water particles when an electric field is applied to oil for 30 minutes. are shown respectively. Note that Figure 3 A, B, and C are 100 times enlarged views of the actual product. The centrifugal separator 2 is connected to the electric field charger 1 through piping, and separates and removes contaminants and moisture from the oil sent from the electric field charger 1. FIG. 2 shows the separation characteristics between the stock solution and the treated solution in a centrifugal separator. In Figure 2, A is the separation characteristic of the undiluted solution, B is the separation characteristic of the oil with an electric field applied for 1 minute, C is the separation characteristic of the oil with the electric field applied for 5 minutes, and D is the separation characteristic of the oil with the electric field applied for 30 minutes. are shown respectively. As can be seen from Figure 2, when the undiluted solution is processed with a centrifuge, the water content of the processed liquid is about 1 to 1.5%, but when the oil is processed with an electric field charger, the water content of the processed liquid is 0.5%. % (5000p.pm) or less. The water removal device 3 has a container and a mass of water-absorbing fibers arranged in the container. As the water-absorbing fiber, for example, an acrylic fiber core material coated with an acrylic water-absorbing gel is used. The table below shows the moisture removal characteristics of the water absorption device.

[Table] As can be seen from this table, by using the water removal device 3, it is easy to reduce the water content in the oil to 200 p.pm or less. The electrostatic oil purifier 4 has a container, positive and negative electrodes formed in the container, and a dust collector disposed between the positive and negative electrodes, and circulates oil between the electrodes to remove water from the oil. It removes contaminant particles and moisture. As mentioned earlier, electrostatic oil purifiers are capable of removing even minute contaminant particles, and contaminants in oil can be removed by 2 mg/100 ml.
It is easy to do the following. However, when the water content in the oil exceeds 500 p.pm, it has the disadvantage that the purification performance decreases. Next, an example of operation of the present invention will be explained. Now, two pieces of oil with contaminant particles of 12 mg/100 ml and water content of 50,000 p.pm are
The electric field charger 1 is supplied with a flow rate of /min.
The oil flowing out from the electric field charger 1 is sent to the centrifuge 2.
and processed by centrifuge 2. The amount of contaminants in the oil processed by centrifuge 2 is 6mg/100
ml, and the water content was 1000 p.pm. Oil flowing out from the centrifuge 2 passes through a water removal device 3. The amount of contaminants in the oil that passed through water removal device 3 was 5mg/100
ml, and the water content was 200 p.pm. The oil that has passed through the water removal device 3 is supplied to an electrostatic oil purifier 4 where it is electrostatically purified. The amount of oil contaminants flowing out from the electrostatic oil purifier 4 is 2mg/100ml, and the water content is 1000p.
It was hot at pm. As can be seen from this operation example, by passing oil containing 12 mg/100 ml of contaminants and 50,000 ppm water through the oil treatment system shown in Figure 1 once, the amount of contaminants can be reduced to 2 mg/100 ml. , moisture is 100 p.p.
m of oil is obtained. As is clear from the above description, according to the present invention, contaminated oil containing a large amount of water and contaminants can be highly purified. Further, the oil treatment method of the present invention has the effect that cleaning treatment can be performed efficiently, and the risk of fire is low and safety is high.

[Brief explanation of drawings]

Fig. 1 is a diagram showing an embodiment of the oil treatment system of the present invention, Fig. 2 is a diagram showing the separation characteristics between the stock solution and the processing liquid in a centrifugal separator, and Fig. 3 is a diagram showing the separation characteristics of the undiluted solution and the processing solution in a centrifugal separator. FIG. 3 is a diagram illustrating the growth of particles. 1...Electric field charger, 2...Centrifugal separator, 3
...Water removal device, 4...Electrostatic oil purifier, 5...Communication pipe.

Claims (1)

[Claims] 1 Apply an electric field to the oil using an electric field charger, send the oil to which the electric field has been applied to the centrifugal separator via the communicating tube, process it in the centrifugal separator, and send the oil treated by the centrifuge through the communicating tube. The oil is sent to a water removal device where water is removed using water-absorbing fibers, and treated by the water removal device.The oil treated by the water removal device is sent to an electrostatic oil purifier through a communication pipe. An oil processing method characterized by sending the oil to a tank and treating it with an electrostatic oil purifier.