JP6601840B2 - Industrial oil maintenance equipment - Google Patents

Description

The present invention relates to a conservation device industrial oil to maintain the properties of industrial oils of the hydraulic oil or the like used in various machinery equipment.

  2. Description of the Related Art Conventionally, various industrial oils are used in various machine equipments for purposes such as power transmission media, lubricants, rust prevention and cooling. For example, in thermal power plants, for example, phosphate esters are widely used as industrial oils for hydraulic operation that are excellent in fire resistance, lubricity, oxidation stability, and responsiveness.

  Industrial oils with excellent fire resistance, lubricity, oxidation stability and responsiveness are expensive, so to maintain performance over a long period of time, it is necessary to detect impurities and grasp the properties of dirt. . For this reason, conventionally, there has been proposed a technique capable of continuously detecting solid matter mixed in hydraulic oil and diagnosing a dirt state (see, for example, Patent Document 1).

  By diagnosing the dirt state, it is possible to detect the contamination of foreign substances and the precipitation of solids accompanying the generation of intermediate substances during use, and prevent various machine troubles such as excessive increase in metal wear of equipment. can do. Expensive industrial oils can be used for as long as possible, leading to a reduction in cost. However, the conventionally proposed technology is a technology that detects a dirty state and prevents machine troubles due to deterioration, so it is expensive. At present, there is no idea to maintain the performance of industrial oils and extend their life. Therefore, in order to maintain the performance of expensive industrial oil and extend its life, it is a fact that the appearance of a maintenance technique capable of maintaining and managing the properties of industrial oil is desired.

JP 2003-105806 A

The present invention has been made in view of the above circumstances, and an object thereof is to provide a security device for industrial oils that can be maintained expensive nature of industrial oils.

This invention pays attention to the point that a solid precipitates, after an industrial substance produces an acidic substance as an intermediate substance with deterioration. The deterioration of the industrial oil in the present invention is that water, dust, air (oxygen) and the like are mixed during use, and the function as the industrial oil is lowered. When industrial oil deteriorates, the precipitated solids induce various machine troubles such as excessive increase in metal wear of the equipment used. That is, the property of the industrial oil that causes the metal wear of the equipment to be used to increase or causes various machine troubles is regarded as deterioration.

The industrial oil maintenance method to which the present invention is applied derives the hydrogen ion concentration of the industrial oil to be preserved, and captures acidic substances contained in the industrial oil based on the derived hydrogen ion concentration. It is preferable to neutralize the industrial oil by introducing a solid additive into the industrial oil and removing the substance after the acidic substance has been captured by a removal filter .

As a result, based on the hydrogen ion concentration of the industrial oil to be protected, the status of acidic substances in industrial oil is ascertained, and solid additives that capture acidic substances according to the status of acidic substances are introduced into industrial oil Then, the performance of the industrial oil to be preserved is maintained by removing the substance after the acidic substance is captured with a removal filter and neutralizing it (by carrying out the neutralization process). As a result, the properties of the expensive industrial oil can be maintained and managed, so that the life of the expensive industrial oil can be extended.

  Since the properties of expensive industrial oil can be maintained, machine troubles can be prevented. By applying the maintenance method of the present invention to, for example, maintenance and management of hydraulic oil for equipment in a power plant, it is possible to eliminate the cost loss due to the power plant being stopped unexpectedly and the cost burden for maintenance.

And in the maintenance method of the industrial oil mentioned above , the said industrial oil is an industrial oil which operates an apparatus, and when the said industrial oil is extracted and circulated, a hydrogen ion concentration is derived and neutralized Preferably it is processed.

As a result, the industrial oil that operates the equipment is extracted and the hydrogen ion concentration is derived and neutralized, so the extraction is performed on the industrial oil at a pressure close to normal pressure, the derivation of the hydrogen ion concentration, Neutralization treatment can be performed.

The industrial oil maintenance device of the present invention according to claim 1 for achieving the above object comprises a hydrogen ion concentration measuring means for measuring the hydrogen ion concentration of the industrial oil to be maintained, and the hydrogen ion concentration measuring means. Information is inputted, property judging means for judging the property of the industrial oil based on the information of the hydrogen ion concentration, and a solid additive for capturing an acidic substance contained in the industrial oil, the industrial oil to be preserved And a removal filter for removing the substance after the acidic substance is trapped, the solid additive is introduced from the additive introduction means, and the industrial oil is removed. And a neutralizing means for neutralizing the industrial oil to be maintained by circulating the oil through a filter.

In the present invention according to claim 1 , the property (deterioration) of the industrial oil is determined by the property determining means based on the hydrogen ion concentration of the industrial oil to be maintained measured by the hydrogen ion concentration measuring means, and the acidic substance If it is determined that the industrial oil is in an acidic state due to the presence of water, the solid additive is added from the additive supply means of the neutralization treatment means, and the industrial oil is passed through the removal filter to carry out the neutralization treatment. To do. As a result, the properties of the expensive industrial oil can be maintained and managed, so that the life of the expensive industrial oil can be extended.

  Since the properties of expensive industrial oil can be maintained, machine troubles can be prevented. By applying the maintenance device of the present invention to, for example, maintenance and management of hydraulic oil for equipment in a power plant, it is possible to eliminate the cost loss due to the power plant being stopped unexpectedly and the cost burden for maintenance.

And the maintenance device for industrial oil of the present invention according to claim 2 is the maintenance device for industrial oil according to claim 1 , wherein the solid additive is an ion exchange resin that adsorbs the acidic substance, The removal filter is a filter that removes an ion exchange resin on which an acidic substance is adsorbed.

In the present invention according to claim 2 , an acidic substance is adsorbed on an ion exchange resin (for example, a weakly basic anion exchange resin or a strongly acidic cation exchange resin), and the ion exchange resin on which the acidic substance is adsorbed is a filter. A neutralization process is implemented by removing. It is also possible to use activated clay that adsorbs acidic substances as a solid additive.

Moreover, the industrial oil maintenance apparatus of the present invention according to claim 3 is the industrial oil maintenance apparatus according to claim 1 or 2 , wherein the storage means and the equipment using the industrial oil are used. A circulation path for circulating the industrial oil between, and a circulation path for extracting the industrial oil from the circulation path and returning the industrial oil to the storage means, and the neutralization treatment means includes the circulation It is provided on the road.

In this invention which concerns on Claim 3 , since the industrial oil which operate | moves an apparatus is extracted from a circulation path and industrial oil is neutralized by a circulation path, with respect to the industrial oil of the pressure close | similar to a normal pressure Extraction, derivation of hydrogen ion concentration, and neutralization treatment can be performed.

According to a fourth aspect of the present invention, there is provided the industrial oil maintenance apparatus according to the third aspect , wherein the hydrogen ion concentration measuring means is an aqueous solution containing the industrial oil or the industrial oil. It is a pH measurement means for measuring the hydrogen ion concentration of a solvent (organic solvent) containing industrial oil.

In this invention which concerns on Claim 4 , hydrogen ion concentration can be derived | led-out by measuring the hydrogen ion concentration of the aqueous solution or solvent (organic solvent) containing industrial oil. By measuring the hydrogen ion concentration of an aqueous solution containing industrial oil, the hydrogen ion concentration index (pH) can be measured, and by measuring the hydrogen ion concentration of a solvent containing industrial oil, the concentration of H ⁺ Can be measured.

According to a fifth aspect of the present invention, there is provided the industrial oil maintenance apparatus according to the fourth aspect , wherein the property judging means is a hydrogen ion concentration index measured by the pH measuring means. When the value of is less than a predetermined value smaller than 7, it is determined that the industrial oil contains an acidic substance, and the neutralization means is adjusted so that the value of the hydrogen ion concentration index approaches 7. A neutralization processing command is output.

In the present invention according to claim 5, when the value of the hydrogen ion concentration index of the industrial oil is equal to or less than a predetermined value smaller than 7, the neutralization means is configured so that the value of the hydrogen ion concentration index approaches 7. Neutralized.

According to a sixth aspect of the present invention, there is provided the industrial oil maintenance apparatus according to the fourth aspect , wherein the hydrogen ion concentration measuring means is colored based on the hydrogen ion concentration. And an indicator means for supplying the indicator to an aqueous solution containing the industrial oil or a solvent (organic solvent) containing the industrial oil.

In the present invention according to claim 6 , by using an indicator that colors (accordingly) based on the hydrogen ion concentration, the indicator is supplied to an aqueous solution containing industrial oil or a solvent (organic solvent) containing industrial oil. (Indicator means) The hydrogen ion concentration can be measured by the color change.

  For example, it is possible to supply a test paper whose color changes depending on the hydrogen ion concentration to an aqueous solution containing industrial oil, and measure the hydrogen ion concentration by changing the color of the test paper. In addition, it is possible to supply an indicator that reflects the hydrogen ion concentration to a solvent (organic solvent) containing industrial oil, and measure the hydrogen ion concentration by changing the color of the indicator.

The industrial oil maintenance device of the present invention can maintain and manage the properties of expensive industrial oil.

It is a schematic block diagram of the turbine equipment provided with the industrial oil maintenance apparatus which concerns on one Example of this invention. It is a graph showing a time-dependent change of a hydrogen ion concentration index (pH). It is a graph showing the time-dependent change of the addition amount (circulation amount of the industrial oil to a circulation path) of a solid additive.

  The industrial oil maintenance device (industrial oil maintenance method) of the present invention focuses on the fact that an industrial oil (phosphate ester) precipitates a solid after an acidic substance is generated as an intermediate substance with deterioration. It has been done. Degradation of phosphate ester means that water, dust, air (oxygen), etc. are mixed during use to produce an acidic substance, resulting in a decrease in the function as industrial oil. As a result, various machine troubles such as an excessive increase in metal wear of the equipment used are induced. The property of the industrial oil that causes the metal wear of the equipment used to increase and causes various machine troubles is regarded as a deteriorated state.

  That is, the phosphoric acid ester (see the following formula (1)) as the hydraulic oil gradually deteriorates with use and is hydrolyzed, whereby a hydrophilic acidic substance ((a) to (a) to (2) in the following formula (2)). (See (d)). In some cases, moisture or dust mixed in during use accelerates deterioration and promotes generation of acidic substances. The acidic substance is not limited to the structure exemplified here.

（Ｒ_１〜Ｒ_５は、それぞれ独立して、Ｈ、ＣＨ_３、ＯＨの何れかを表す。）

(R _{1 to} R ₅ each independently represents any of H, CH ₃ , and OH.)

（Ｒ_１〜Ｒ_５は、それぞれ独立して、Ｈ、ＣＨ_３、ＯＨの何れかを表す。）

(R _{1 to} R ₅ each independently represents any of H, CH ₃ , and OH.)

  As described above, an acidic substance is generated when the phosphate ester deteriorates. In the maintenance method of the industrial oil of the present invention shown below, the hydrogen ion concentration of the hydraulic oil is measured, and based on the measurement result, a solid additive that captures acidic substances contained in the hydraulic oil is introduced into the hydraulic oil, The hydraulic oil is neutralized by removing the substance after the acidic substance is trapped with a removal filter.

  Specifically, as one example, as a hydrogen ion concentration measuring means for measuring the hydrogen ion concentration of a phosphate ester, a hydrogen ion concentration index of an aqueous phosphate ester solution is detected by a pH measuring means (by a pH meter) ( And when the value of the hydrogen ion concentration index is less than or equal to a predetermined value less than 7 (indicating an acidic value), the value of the hydrogen ion concentration index is As shown in Fig. 7, a solid additive is added to the phosphate ester to capture the acidic substance, and then the phosphate ester is neutralized by removing the captured substance with a removal filter. The performance of the phosphate ester is maintained (a state in which no acidic substance is present) is maintained.

  In other words, based on the hydrogen ion concentration (hydrogen ion concentration index) of the phosphate ester to be preserved, the status of the acidic substance in the phosphate ester is grasped and neutralized according to the situation of the acidic substance (neutralize By carrying out the treatment, it is possible to maintain the performance of the phosphate ester as an industrial oil to be preserved. As a result, it is possible to maintain and manage the properties of the phosphate ester, which is an expensive industrial oil, and extend the lifetime of the phosphate ester.

The hydrogen ion concentration measuring means (pH measuring means) of the present invention is not limited to the configuration for detecting the pH of an aqueous solution containing industrial oil, but the hydrogen ion concentration of a solvent (organic solvent) containing industrial oil, that is, H It is also possible to apply a means for measuring the concentration of ⁺ and determine whether an acidic substance is generated based on the concentration of H ⁺ .

  As a means for measuring the hydrogen ion concentration, an indicator that colors (accordingly) based on the hydrogen ion concentration can be used to supply the indicator to an aqueous solution containing industrial oil or a solvent (organic solvent) containing industrial oil. (Indicator means).

  Specifically, a test paper whose color changes (colors) based on the hydrogen ion concentration index can be applied (supplied) to an aqueous solution containing industrial oil. Moreover, it is also possible to supply the indicator which colors according to a hydrogen ion concentration index | exponent in the aqueous solution containing industrial oil. It is also possible to carry out both application of test strips and supply of indicators.

  Specifically, it is possible to supply an indicator that changes color reflecting the hydrogen ion concentration to a solvent (organic solvent) containing industrial oil. In addition, it is possible to apply (supply) a test paper whose color changes (colors) according to the hydrogen ion concentration. It is also possible to carry out both the supply of indicator and the application of test strips.

  The industrial oil maintenance apparatus of the present invention will be described below with reference to the drawings.

  FIG. 1 is a schematic configuration of a turbine facility equipped with an industrial oil maintenance apparatus according to an embodiment of the present invention, FIG. 2 is a graph showing a change over time of a hydrogen ion concentration index (pH), and FIG. It is a graph showing the time-dependent change of the circulation amount of the industrial oil to a path | route.

  The industrial oil whose properties are maintained in the illustrated embodiment is an example of hydraulic oil (phosphate ester) of an actuator (equipment) that operates a valve member (steam type) that performs output control of the steam turbine. .

  As shown in FIG. 1, a steam turbine 1 includes a high-pressure turbine 2 that obtains driving force by introducing high-pressure steam from a boiler (not shown), and an intermediate-pressure turbine 3 that obtains driving force by steam extracted from the high-pressure turbine 2. And a low-pressure turbine 4 that obtains driving force by steam extracted from the intermediate-pressure turbine 3. A generator 5 is connected to the high-pressure turbine 2, the intermediate-pressure turbine 3, and the low-pressure turbine 4, and the generator 5 is operated by driving the high-pressure turbine 2, the intermediate-pressure turbine 3, and the low-pressure turbine 4 to obtain generated power. The steam that has finished work in the low-pressure turbine 4 is cooled and condensed by the condenser 6, and the condensed water obtained by the condenser 6 is supplied to a boiler (not shown).

  A steam valve 8 that performs output control of the steam turbine 1 is provided on the upstream side of the high-pressure turbine 2. That is, the flow rate of the steam sent to the high pressure turbine 2 is controlled by the operation of the steam valve 8. The steam valve 8 is opened and closed by an actuator 9 which is a device using hydraulic oil (phosphate ester) as industrial oil, and the flow rate of steam sent to the high-pressure turbine 2 is controlled by the opening and closing operation of the steam valve 8. Thus, the output of the steam turbine 1 is controlled.

  A circulation system 11 through which the hydraulic oil of the actuator 9 circulates is provided. The circulation system 11 is provided with a storage tank 12 as storage means for storing hydraulic oil, and the hydraulic oil is sent to the actuator 9 by a pump 14 through a circulation path 13. The hydraulic oil discharged from the actuator 9 is returned to the storage tank 12.

  A neutralization treatment means 16 is provided that performs a neutralization treatment of the hydraulic oil by branching from the circulation system 11 and capturing and removing a substance (acidic substance) contained in the hydraulic oil. That is, an extraction path 17 (circulation path) branched from the circulation path 13 of the circulation system 11 and circulated to the storage tank 12 is provided. The extraction path 17 has a circulation pump 18, an additive supply unit 31, and a removal filter 20. Is provided. The additive supply unit 31 is supplied with hydraulic oil from the circulation path 13 and solid additive from the additive charging means 32.

  As the solid additive, for example, an ion exchange resin (weakly basic anion exchange resin, strong acid cation exchange resin, or the like) is applied. In addition, it is also possible to apply activated clay as a solid additive.

  A flow control valve 15 is provided in the extraction path 17 on the upstream side of the circulation pump 18. When the flow control valve 15 is opened, the hydraulic oil is sent to the neutralization processing means 16, the hydraulic oil is sent to the additive supply unit 31, and a predetermined amount of solid additive (for example, ion exchange) is supplied from the additive charging means 32. Resin). In the additive supply unit 31, an acidic substance is adsorbed on the ion exchange resin, and the ion exchange resin on which the acidic substance is adsorbed is captured by the removal filter 20, the acidic substance is removed, and the hydraulic oil is neutralized (medium Sexualized). The neutralized hydraulic fluid (neutralized hydraulic fluid) is returned to the storage tank 12.

  That is, the neutralizing means 16 neutralizes the hydraulic oil flowing through the circulation system 11, that is, the hydraulic oil stored (returned) in the storage tank 12 to maintain the properties (hydrogen ion concentration index is a predetermined value). The performance is maintained so that water, dust, air (oxygen), etc. are mixed in the hydraulic oil during use and the function as the hydraulic oil is not deteriorated.

  Specifically, the hydrogen ion concentration index (pH) of the hydraulic oil in the circulation path 13 is derived (measured), and the hydraulic oil is circulated through the extraction path 17 (neutralization processing means 16) based on the measured pH. Thus, the hydraulic oil is neutralized, and a predetermined amount of ion exchange resin is sent from the additive charging means 32 to the additive supply unit 31. The ion exchange resin on which the acidic substance is adsorbed is captured by the removal filter 20 to remove the acidic substance, and the hydraulic oil is neutralized (made neutral).

  Thereby, the pH of the hydraulic oil is maintained within a predetermined value range so that the properties of the hydraulic oil in a state where the metal wear of the device (actuator 9 or the like) used becomes excessive is not maintained (property is maintained). )

  That is, a sorting path 21 is provided that branches from the circulation path 13 on the upstream side (storage tank 12 side) of the portion where the extraction path 17 branches to take out hydraulic oil. A pH measuring unit 24 (hydrogen ion concentration measuring unit) for deriving a hydrogen ion concentration index of the hydraulic oil extracted through the sorting channel 21 is provided at the tip of the sorting channel 21. In the pH measuring means 24, the ion concentration index (pH) of the aqueous solution of hydraulic oil is measured with a pH meter.

  The measurement information of the pH measuring unit 24 is input to the property determining unit 25 (control unit), and the property determining unit 25 has a predetermined pH value smaller than 7 (for example, an arbitrary value from 4 to 6, or about 3). ) In the following cases, the deterioration state (property) of the hydraulic oil is determined on the assumption that the hydraulic oil contains an oxidizing substance.

  For example, if the value of the hydrogen ion concentration index (pH) measured by the pH measuring unit 24 is equal to or less than a predetermined value smaller than 7, for example, the function as hydraulic fluid may be deteriorated. Means 25 determines the deterioration state of the hydraulic oil.

  The property determination means 25 outputs an open / close command to the flow control valve 15 when the pH value measured by the pH measurement means 24 is equal to or less than a predetermined value smaller than 7, for example, by driving the circulation pump 18. The hydraulic oil is sent to the additive supply unit 31, and a predetermined amount of ion exchange resin is sent from the additive supply unit 32 to the additive supply unit 31.

  In the additive supply unit 31, an acidic substance is adsorbed on the ion exchange resin, and the ion exchange resin on which the acidic substance is adsorbed is captured by the removal filter 20, the acidic substance is removed, and the hydraulic oil is neutralized (medium Sexualized). The neutralized hydraulic fluid (neutralized hydraulic fluid) is returned to the storage tank 12.

  In the above-described circulation device that circulates the hydraulic oil (phosphate ester) of the actuator 9 for operating the steam valve 8 of the steam turbine 1, the hydraulic oil circulates through the circulation path 13 of the circulation system 11, so that the storage tank Hydraulic fluid is circulated between the actuator 12 and the actuator 9.

  When the hydraulic oil in the storage tank 12 is deteriorated and the pH value measured by the pH measuring means 24 becomes a predetermined value smaller than 7 (for example, an arbitrary value from 4 to 6 or about 3), the flow rate An opening / closing command is output to the control valve 15. When the flow control valve 15 is opened, the hydraulic oil is sent to the additive supply unit 31, the ion exchange resin is supplied to the additive supply unit 31, and the acidic substance is adsorbed by the ion exchange resin. The ion exchange resin to which the acidic substance is adsorbed is captured by the removal filter 20, the pH of the hydraulic oil is brought close to 7 (neutralized), and the neutralized hydraulic oil is returned to the storage tank 12.

  As shown by a dotted line in FIG. 2, in the case of hydraulic oil that has a short usage time and is nearly new, the pH value of the hydraulic oil is close to neutrality, for example, slightly lower than 7. When the time elapses, the acidic substance increases and the pH value of the hydraulic oil becomes, for example, a value close to 6, and the acidic substance increases with the passage of time, and the pH value of the hydraulic oil becomes, for example, a value lower than 6. It becomes.

  As shown in FIG. 3, according to the pH value of the hydraulic oil measured by the pH measuring means 24, the flow amount of hydraulic oil sent to the additive supply unit 31 so that the pH approaches 7, and the additive The supply amount of the ion exchange resin from the charging means 32 is controlled with time. Thereby, as shown by a solid line in FIG. 2, the pH value of the hydraulic oil is maintained in the vicinity of 7 (maintained in a neutralized state).

  As described above, the pH value of the hydraulic oil is measured by the pH measuring unit 24, and the property of the hydraulic oil is determined by the property determining unit 25 based on the pH value measured by the pH measuring unit 24. On the basis of this, the flow control valve 15 is opened and closed, the flow amount of the hydraulic oil sent to the additive supply unit 31 and the supply amount of the ion exchange resin from the additive charging means 32 are controlled, and the hydraulic oil is neutralized. And returned to the storage tank 12.

  For this reason, the measurement, extraction, and neutralization of the pH of the hydraulic oil (aqueous solution) can be performed on the hydraulic oil having a pressure close to normal pressure, and control becomes easy. Since it is the structure which extracts the hydraulic oil of the pressure close | similar to a normal pressure, it is easy to add the structure which implements the neutralization process to the existing installation.

  As a result, it becomes possible to maintain and maintain (maintain) the properties of hydraulic oil, which is an expensive industrial oil, like the hydraulic oil of the actuator 9 that opens and closes the steam valve 8, and extends the life of the hydraulic oil. be able to. Therefore, since the properties of expensive industrial oil can be maintained (maintained), machine troubles at the power plant can be prevented in advance, and the cost loss and maintenance due to the power plant shutting down unexpectedly can be prevented. Can eliminate the cost burden.

  In the above-described embodiments, phosphate oil is used as an example of hydraulic oil (industrial oil), but various industrial oils such as other hydraulic oil (hydraulic hydraulic oil) and lubricating oil are preserved. It is possible to target. That is, as long as it is an industrial oil that produces a hydrophilic acidic substance with deterioration, for example, the maintenance method and maintenance device of the present invention can be basically used, and hydraulic oil is supplied to the actuator 9. It can be applied to a circulating device.

DESCRIPTION OF SYMBOLS 1 Steam turbine 2 High pressure turbine 3 Medium pressure turbine 4 Low pressure turbine 5 Generator 6 Condenser 8 Steam valve 9 Actuator 11 Circulation system 12 Reservation tank 13 Circulation path 14 Pump 15 Flow control valve 16 Neutralization means 17 Extraction path 18 Circulation Pump 19 Ion exchange filter 20 Removal filter 21 Sorting path 24 pH measuring means 25 Property judging means 31 Additive supply unit 32 Additive feeding means

Claims (6)

A hydrogen ion concentration measuring means for measuring the hydrogen ion concentration of industrial oil to be maintained;
Information on the hydrogen ion concentration measuring means is input, and property determining means for determining the properties of the industrial oil based on the information on the hydrogen ion concentration;
An additive charging means for adding a solid additive for capturing an acidic substance contained in the industrial oil to the industrial oil to be protected, and a removal filter for removing the substance after the acidic substance is captured. And the neutralization processing means for neutralizing the industrial oil to be maintained by supplying the solid additive from the additive input means and allowing the industrial oil to flow through the removal filter. Industrial oil maintenance equipment characterized by In the industrial oil maintenance apparatus according to claim 1 ,
The solid additive is an ion exchange resin that adsorbs the acidic substance,
The said removal filter is a filter which removes the ion exchange resin by which the acidic substance was adsorbed. The industrial oil maintenance apparatus characterized by the above-mentioned. In the industrial oil maintenance apparatus according to claim 1 or 2 ,
A circulation path for circulating the industrial oil between the storage means and the equipment in which the industrial oil is used;
A circulation path for extracting the industrial oil from the circulation path and returning the industrial oil to the storage means,
The industrial oil maintenance apparatus, wherein the neutralization processing means is provided in the circulation path. In the industrial oil maintenance apparatus according to claim 3 ,
The hydrogen ion concentration measuring means is
An industrial oil maintenance device, characterized in that it is a pH measurement means for measuring a hydrogen ion concentration of an aqueous solution containing the industrial oil or a solvent containing the industrial oil. In the industrial oil maintenance apparatus according to claim 4 ,
The property determining means includes
When the value of the hydrogen ion concentration index measured by the pH measuring means is not more than a predetermined value smaller than 7, it is determined that the industrial oil contains an acidic substance, and the value of the hydrogen ion concentration index is An industrial oil maintenance device that outputs a neutralization treatment command to the neutralization treatment means so as to approach 7. In the industrial oil maintenance apparatus according to claim 4 ,
The hydrogen ion concentration measuring means is
An industrial oil maintenance apparatus, comprising: an indicator means for supplying an indicator to an aqueous solution containing the industrial oil or a solvent containing the industrial oil, using an indicator colored based on a hydrogen ion concentration.

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