JPH0824856B2 - Electrostatic oil cleaner - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a turbine oil, a lubricating oil,
The present invention relates to an electrostatic oil purifier that purifies an insulating liquid such as processing cutting oil by applying a high voltage. More specifically, the present invention not only removes contaminants in various insulating liquids, but also accurately detects the water content in the liquids to prevent corrosion of devices using the insulating liquids. The present invention relates to an electrostatic oil purifier that can be used.

[0002]

2. Description of the Related Art A dust collector (collector) for removing contaminants in an insulating liquid such as lubricating oil or turbine oil is arranged between opposing positive and negative electrode plates, and a high voltage For example, a device for removing contaminants of the insulating liquid by circulating the insulating liquid between the electrode plates by a circulating pump to form an electric field by applying 10 kv), a so-called electrostatic oil purifier is well known. It has been done.

The above-described electrostatic oil purifier is disclosed in Japanese Examined Patent Publication No. 50-11.
No. 09, No. 53-139, etc., for example, EDC manufactured by Clean Tech Industrial Co., Ltd.
(Electrostatic Dust Collector) Type 25, Type 50,
The same 100 type, etc. can be used.

However, in the conventional electrostatic oil purifier, for example, when turbine oil that is circulated and used as lubricating oil for a steam turbine for power generation is purified by the electrostatic oil purifier, contaminants in the turbine oil are used. However, since there is no means to detect the content of water that is mixed and accumulated in turbine oil, it causes corrosion of the equipment of the turbine system due to the increase in the water content. Therefore, the value of the electrostatic oil purifier is reduced. This is not limited to the case of the turbine oil described above, and is applicable to insulating liquids such as hydraulic oil and cutting oil.

Conventionally, for example, as a device for detecting water in purified oil, there are a device utilizing a change in permittivity and a device for intermittently sampling and automatically measuring, but only a device having a water content of several thousands ppm order. It cannot be measured, or it is expensive regardless of its single function of detecting moisture.

[0006]

From the above, the electrostatic oil purifier has an inexpensive detection mechanism capable of accurately detecting the water content in the insulating liquid as well as removing the contaminants in the insulating liquid. The arrangement is strongly requested. As a result of earnest studies to meet the above demands, the inventors of the present invention have constructed a dust collector (collector) disposed between positive and negative electrode plates of an electrostatic oil purifier with a water-absorbing and water-absorbing material. It has been found that, when water in the insulating liquid to be purified is absorbed and adsorbed by the dust collector, a change in the high-voltage current value can be detected in correlation with the absorbed water and the adsorbed amount. The present invention is based on the above findings, and in addition to electrostatic oil purifying according to the present invention, an electrostatic oil purifier useful for preventing rusting or corrosion due to water in oil of oil-using system is useful. Provided.

[0007]

The present invention will be described in brief. According to the present invention, a water-absorbing dust collector that removes contaminants in an insulating liquid is provided between the positive and negative electrode plates facing each other. A high voltage is applied between the electrode plates to form an electric field, and the insulating liquid is circulated from the reservoir of the insulating liquid disposed outside between the two electrode plates to remove contaminants in the insulating liquid. In the electrostatic oil purifier to be removed, a current value that correlates with the amount of water contained in the insulating liquid flowing between the oppositely disposed positive and negative electrode plates that is collected in the dust collector is detected, and the current value is detected. The present invention relates to an electrostatic oil purifier characterized in that a water content detection unit for calculating the water content of an insulating liquid is provided.

The technical construction and embodiments of the present invention will be described in detail below with reference to the drawings. Needless to say, the present invention is not limited to the illustrated one.

FIG. 1 is a view for explaining the configuration of the electrostatic oil purifier (A) of the present invention and the usage thereof. In addition, as an aspect of using the electrostatic oil purifier (A) of the present invention described below, an example of turbine oil purification will be described. As shown in FIG. 1, the electrostatic oil cleaner (A) of the present invention includes an electrostatic oil tank (1), a high voltage generator (2), and a water content detector (3).
It consists of three main components.

As shown in FIG. 1, the electrostatic oil purifier (A)
Is connected to an oil storage tank (B) of turbine oil, and turbine oil containing pollutants and water in the oil storage tank (B) is circulated to an electrostatic oil cleaner (1) via a pump (P). Be liquefied. Further, as shown in FIG. 1, the turbine oil storage tank (B) is connected to a desired working system (C), for example, a turbine system for power generation, and purified turbine oil is used as a lubricating oil for a turbine. Is circulated and sent as liquid.

The structure of the electrostatic oil purification tank (1) which is a main component of the electrostatic oil purification machine (A) of the present invention is shown in detail in FIG. The electrostatic oil purification tank (1) is configured by disposing a dust collector (collector (13) between the positive and negative electrode plates (11, 12) facing each other. Specifically, for example, the high voltage electrode plate (1).
1) is used as a negative electrode and the ground electrode plate (12) is used as a positive electrode, and a high voltage of 10 KV is applied between the both electrode plates by the high voltage generating section (2).

In the present invention, the above-mentioned dust collector (collector) (13) arranged between the positive and negative electrode plates plays an important role in cooperation with the water content detecting section (3) described later. . Conventionally, this type of dust collector (13) for an electrostatic oil purifier has a positive and negative pollutant such as negatively charged fine particles in an insulating liquid due to a high electric field applied between the positive and negative electrode plates. There is a demand for a form in which the contaminant can be easily removed when moving between the electrodes. For example, various filters such as paper filters, cotton filters, cellulosic nonwoven fabrics, and synthetic fiber nonwoven fabrics are used.

However, in the present invention, as described above, the water in the turbine oil is positively adsorbed and absorbed by the dust collector (collector) (13), and the dust collector (13) is absorbed.
Is electrically conductive, and has the greatest characteristic point in that a minute current flowing through the dust collector (13) is detected by the water content detection unit (3). For this reason, it is important that the dust collector (13) applied to the electrostatic oil purifier (A) of the present invention is made of a material excellent in water absorption and water adsorption. For example, C
P-400 (manufactured by Clean Tech Industrial Co., Ltd.) or the like is used. On the other hand, a water-repellent dust collector such as a polypropylene non-woven fabric is inappropriate in the present invention.

In the present invention, the high voltage generator (2) constituting the electrostatic oil purifier (A) is not particularly limited as long as it generates a high voltage. For example, an external power source (AC10
From 0 v), DC10 KV is generated by the high voltage generator (3).

In the present invention, the water content detector (3) constituting the electrostatic oil purifier (A) has a positive electrode (+) and a negative electrode (-) of the high voltage generator (2) as shown in FIG. ) Is connected to
There is no particular limitation as long as it can detect a minute current flowing between the positive and negative electrode plates (11, 12) of the electrostatic oil cleaner (A). Although not shown, a desired resistance and a capacitor are arranged in parallel between the positive electrode (+) and the negative electrode (−) of the high voltage generator (2), and a small amount of current flows in the water content detector (3). Needless to say, it should be possible to detect.

Next, the structure of the water content detecting section (3) will be described in more detail. FIG. 3 shows that when water is mixed in the turbine oil, the current value detected by the water content detection unit (3) increases with the operating time of the electrostatic oil purifier.
Moreover, the increase rate shows that it is closely related to the water content in turbine oil. In addition, in FIG. 3, an EDC-100 type (manufactured by Clean Tech Industrial Co., Ltd.) is used as an electrostatic oil purifier, the applied voltage is 10 KV, the oil to be purified is turbine oil # 32, and the oil temperature is 40 ° C. The results obtained by and are shown. In FIG. 3, the horizontal axis represents the operating time of the electrostatic oil purifier, and the vertical axis represents the detected current value (mA).

From the above, the water content detection unit (3) has a function of detecting a desired minimum current value (for example, 1 mA) and a current value after a predetermined time (for example, 10 minutes). Those are preferable. The state below the minimum current value (for example, 1 mA) is a level at which it is not particularly necessary to operate the water content detection unit (3) because the water content in the turbine oil is very small, and the set value is the target of purification. It may be appropriately determined depending on the oil. Similarly, the water content detection unit (3)
The time to detect the current value after operating
It may be appropriately determined depending on the oil to be purified. Then, the water content detection unit (3) calculates the increase rate of the current value at the predetermined time by a calculator (not shown), and compares the water content in the turbine oil with, for example, a reference table (LUT). Those having a function of calculating and displaying are preferable. Needless to say, in order to accurately calculate the water content, it is only necessary to obtain a large amount of correlation data as shown in FIG. 3 and input it in a reference table (LUT) as data. Needless to say.

Further, the water content detection unit (3) may have more functions. FIG. 4 shows reference data therefor. FIG. 4 shows the water content detection unit (3).
And (i) a function of stopping the operation of the pump (P) for sending turbine oil from the oil storage tank (B) when an extremely high water content is detected, and (ii) the pump (P) It shows the drop data of the minute current value observed after the pump is stopped by using the one having the function of continuously detecting the minute current after the stop. In addition, in FIG.
This shows that the operation of the pump (P) is stopped when the water content detection unit (3) detects 10 mA as the maximum current value. The set value of the maximum current value may be appropriately determined in consideration of the required accuracy of corrosion prevention for the equipment with which the turbine oil contacts.

In the water content detecting section (3) having the above-mentioned function, after the pump (P) is stopped, the supply of the water-containing turbine oil into the electrostatic oil cleaning tank (1) is stopped, but the water is not collected in the tank. Since the dust (13) absorbs water and the adsorbed water is electrolyzed, the detected current value thereafter decreases as shown in FIG. FIG. 4 shows a case where the turbine oil contains a trace amount of tap water as water (solid line graph) and a case where sea water is contained as water (dotted line graph). Needless to say, in the case of seawater, since the seawater contains more electrolyte than tap water, the rate of current drop is slower than that of tap water. Therefore, the water content detection unit (3) has a function of transmitting a stop signal of the pump (P) when the maximum current value (for example, 10 mA) is detected and a function of detecting the subsequent rate of decrease of the current value, Furthermore, by inputting the descent pattern into the calculator, the water quality of the water present in the turbine oil can be determined.

Water containing an electrolyte in the turbine oil (for example,
In the case where seawater, etc.) is mixed, it has a serious effect such as corrosion on the equipment system in contact with turbine oil. Therefore, the water content detection unit (3) of the present invention has a function of outputting an alarm signal when a predetermined maximum current value is detected, and further when moisture containing a large amount of electrolyte is detected. Preferably.

Various modifications to the above-described embodiment of the present invention are possible. For example, although the water content detection unit (3) is incorporated in the electrostatic oil purifier (A), it may be provided outside, or the pump (P) may be installed in the electrostatic oil purifier (A). It goes without saying that it may be incorporated. Needless to say, the oil to be purified is not limited to turbine oil.

[0022]

The electrostatic oil purifier of the present invention has a water content detecting section for accurately detecting the water content in an insulating liquid such as turbine oil, lubricating oil, and working cutting oil. Then, the electrostatic oil purifier having the water content detection unit of the present invention,
This is an extremely economical system because it uses the conventional configuration of an electrostatic oil purifier and has a mechanism for detecting a minute current based on the water absorbed and absorbed by the dust collector (collector). is there. Therefore, according to the present invention, not only removal of contaminants in various insulating liquids such as turbine oil,
Since the water content in the liquid can be accurately detected,
(EN) Provided is an economical electrostatic oil purifier capable of preventing damages due to corrosion etc. of devices utilizing an insulating liquid.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a configuration of an electrostatic oil purifier according to the present invention and a usage mode thereof.

FIG. 2 is a plan view of an electrostatic oil cleaner tank that constitutes an electrostatic oil cleaner.

FIG. 3 shows a change over time in the current value detected by the water content detection unit (3) according to the water content in turbine oil during the operation of the electrostatic oil purifier.

FIG. 4 is a graph showing a drop change in the current value detected by the water content detection unit according to the water quality (tap water, seawater) after the pump is stopped (the supply of turbine oil to the electrostatic oil purification tank is stopped). is there.

[Explanation of symbols]

 A ……………… Electrostatic oil cleaner 1 ……………… Electrostatic oil tank 11 ………… High-voltage electrode plate (−) 12 ………… Ground electrode plate (+) 13 ………… Dust collection Body (collector) 2 ……………… High voltage generator 3 ……………… Moisture content detector B ……………… Turbine oil storage tank C ……………… Work system P ……………… Pump

 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Seiro Miyazaki 2-82 Watanabe-dori, Chuo-ku, Fukuoka, Fukuoka Prefecture Kyushu Electric Power Co., Inc. (72) Inventor Toshio Hayashida 2 Watanabe-dori, Chuo-ku, Fukuoka, Fukuoka 1-82, Kyushu Electric Power Co., Inc. (72) Inventor Masahiko Eto, 6-18, Hayaya-ku, Hakata-ku, Fukuoka City, Fukuoka Prefecture Kiyoshi Inoue (72) Inventor, Shinji Uchiyama 2-chome, Higashi-Oi, Shinagawa-ku, Tokyo No. 7 Inside Clean Tech Industrial Co., Ltd. (56) Reference Japanese Patent Laid-Open No. 1-63066 (JP, A) Actually opened 62-118537 (JP, U) Actually opened 62-118534 (JP, U)

Claims (4)

[Claims] 1. A water-absorbing dust collector that removes contaminants in an insulating liquid is provided between positive and negative electrode plates facing each other, and
A high voltage is applied between the two electrode plates to form an electric field, and the insulating liquid is circulated from the storage part of the insulating liquid disposed outside between the two electrode plates to contaminate the insulating liquid. In an electrostatic oil purifier that removes a substance, a current value that correlates with the amount of moisture contained in the insulating liquid flowing between the oppositely disposed positive and negative electrode plates that is collected in the dust collector is detected, and An electrostatic oil purifier characterized in that a water content detection unit for calculating the water content of an insulating liquid from a change in current value is provided. 2. The water content detection unit is activated when a predetermined minimum current value is detected, detects the current value after a predetermined time, and detects the current value in the insulating liquid from the rate of increase of the current value during the predetermined time. The electrostatic oil purifier according to claim 1, which calculates and displays a water content. 3. The water content detection unit outputs an alarm signal and a circulation stop signal for stopping circulation in the insulating liquid when a predetermined maximum current value is detected. Item 1. The electrostatic oil purifier according to Item 1. 4. The water-absorbing dust collector detects a predetermined current value in the water content detecting portion and stops the circulation of the insulating liquid,
The water absorption of the water absorbent dust collector is electrolyzed by continuing to apply a high voltage between both electrode plates to recover the water absorbency of the water absorbent dust collector. The described electrostatic oil purifier.