Method for recycling industrial oil, and information processing apparatus.

Abstract

To improve the recycling technology for industrial oils. [Solution] A method for regenerating industrial oil in a tank that stores industrial oil for the purpose of circulating industrial oil used in the operation of equipment, comprising: closing a return pipe for returning industrial oil used in the operation of equipment back to the tank when the concentration of industrial oil inside the tank falls below a standard value; raising the temperature of the liquid inside the tank to a set temperature at or above a temperature at which the viscosity of the industrial oil is 50% or higher than the viscosity at the ambient temperature where the tank is installed, and below the boiling point of the liquid mixed into the tank; and, after standing at the set temperature for a predetermined time, discharging the mixed liquid that has floated to the top of the tank or settled to the bottom of the tank.

Description

[Technical Field]

[0001] This disclosure relates to a method for recycling industrial oil and an information processing device. [Background technology]

[0002] Industrial oils such as hydraulic fluid and lubricating oil are used to operate the equipment. These oil tanks may become contaminated with liquids used around the equipment, such as water and chemicals. When liquids such as water are mixed with the oil, the oil film thins at metal-to-metal contact points, potentially causing equipment malfunctions due to frictional heat. Therefore, in such cases, it is necessary to remove the liquids such as water from the tank. Methods for doing this include removing water by raising the temperature inside the tank to 100°C or higher, or by having an external company regenerate the industrial oil (for example, Patent Documents 1 and 2). [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Patent No. 4980385 [Patent Document 2] Japanese Patent Publication No. 2003-103160 [Overview of the project] [Problems that the invention aims to solve]

[0004] However, when the temperature of industrial oil is raised using the method described above, the liquid boils, causing the oil level gauge in the tank to malfunction and resulting in spills and other problems. In addition, the rising temperature and the generation of bubbles cause the industrial oil to deteriorate rapidly. On the other hand, while the method of having an external company regenerate the industrial oil can improve the condition of used industrial oil, it has the problem of taking a long time to deliver. Thus, there was room for improvement in industrial oil regeneration technology.

[0005] In light of these circumstances, the purpose of this disclosure is to improve industrial oil recycling technology. [Means for solving the problem]

[0006] (1) A method for regenerating industrial oil according to one embodiment of the present disclosure is: A method for recycling industrial oil in a tank that stores industrial oil for the purpose of circulating and reusing industrial oil used in the operation of equipment, When the concentration of industrial oil inside the tank falls below a standard value, the return pipe for returning the industrial oil used to operate the equipment back to the tank is closed. The temperature of the liquid inside the tank is raised to a set temperature that is 50% or higher than the viscosity of the industrial oil at the ambient temperature where the tank is installed, and below the boiling point of the liquid mixed in the tank. After allowing the tank to stand for a predetermined time at the set temperature, the mixed liquid that has floated to the top or settled to the bottom of the tank is discharged. Includes.

[0007] (2) A method for regenerating industrial oil according to one embodiment of the present disclosure is the method for regenerating industrial oil described in (1), At least one moisture meter is provided inside the tank, and based on the moisture meter readings inside the tank, it is detected that the concentration of industrial oil is below a standard value.

[0008] (3) A method for regenerating industrial oil according to one embodiment of the present disclosure is the method for regenerating industrial oil described in (1) or (2), The predetermined time is determined based on the set temperature and the tank height.

[0009] (4) A method for regenerating industrial oil according to one embodiment of the present disclosure is a method for regenerating industrial oil according to any one of the items (1) to (3), At least one moisture meter is provided inside the tank, and the system notifies the user of the elapsed time based on the moisture meter reading inside the tank, which has been left standing at the set temperature.

[0010] (5) The industrial oil regeneration method according to an embodiment of the present disclosure is the industrial oil regeneration method according to any one of (1) to (4), An oil detection valve is provided at a discharge port for discharging the mixed liquid floating on the upper part or settling at the lower part of the tank, and the oil detection valve automatically stops the discharge process after the mixed liquid is discharged.

[0011] (6) The industrial oil regeneration method according to an embodiment of the present disclosure is the industrial oil regeneration method according to (5), The oil detection valve is automatically opened at regular intervals.

[0012] (7) The information processing apparatus according to an embodiment of the present disclosure is An information processing apparatus that executes a regeneration process of industrial oil in a tank for storing industrial oil for circulation use in the operation of equipment, and includes a control unit. The control unit When the concentration of the industrial oil inside the tank becomes below the reference value, closes a return pipe for returning the industrial oil used in the operation of the equipment to the tank, Raises the temperature of the liquid inside the tank to a set temperature that is 50% or more of the viscosity when the viscosity of the industrial oil is the same as the viscosity at the ambient temperature of the installation location of the tank and is less than the boiling point of the liquid mixed in the tank, After allowing it to stand for a predetermined time at the set temperature, discharges the mixed liquid floating on the upper part or settling at the lower part of the tank.

Advantages of the Invention

[0013] According to an embodiment of the present disclosure, the industrial oil regeneration technology is improved.

Brief Description of the Drawings

[0014] [Figure 1] It is a diagram showing a schematic configuration of a piping system according to an embodiment of the present disclosure. [Figure 2] It is a flowchart showing an outline of an industrial oil regeneration method according to an embodiment of the present disclosure. [Figure 3] A schematic diagram showing the separation state of working oil, water droplets, and water in a tank according to an embodiment of the present disclosure. [Figure 4] A graph showing the relationship between temperature and the moving speed of water droplets according to an embodiment of the present disclosure. [Figure 5] A graph showing the viscosity of oil and the range of a predetermined set temperature according to an embodiment of the present disclosure. [Figure 6] A diagram showing an overview of the inside of the tank 20 immediately after temperature rise and after a predetermined time has elapsed according to an embodiment of the present disclosure. [Figure 7] A diagram showing an overview of a piping system according to Modification 1 of the present disclosure. [Figure 8] A block diagram showing the configuration of an information processing apparatus according to an embodiment of the present disclosure. [Figure 9] A diagram showing an overview of a piping system according to Modification 2 of the present disclosure.

Embodiments for Carrying Out the Invention

[0015] Hereinafter, embodiments of the present disclosure will be described. The method for regenerating industrial oil according to an embodiment of the present disclosure can be used, for example, in the piping system 1 shown in FIG. 1. The piping system 1 includes a facility 10, a tank 20, and an oil cooler 40. The facility 10 includes facilities that require industrial oil. The tank 20 stores industrial oil for circulating the industrial oil used in the operation of the facility 10. The oil cooler 40 cools the industrial oil supplied from the tank 20. The drained oil from the facility 10 is returned to the tank 20 through the return pipe 11. In the return pipe 11, a valve 21 is provided between the facility 10 and the tank 20. The valve 21 closes or opens the flow of working oil from the return pipe 11 to the tank 20.

[0016] The working oil is also sent from the tank 20 to the oil cooler 40 via piping 12. In piping 12, a valve 22 and an oil supply pump 23 are provided between the tank 20 and the oil cooler 40, respectively. The valve 22 closes or opens the flow of working oil from the tank 20 to piping 12. The oil supply pump 23 pressurizes the working oil in piping 12 and plays a role in circulating the working oil in the piping system 1. The oil cooler 40 and the equipment 10 are connected by piping 13. The working oil cooled in the oil cooler 40 flows through piping 13 and is supplied to the equipment 10.

[0017] In this case, tank 20 may contain liquids other than industrial oil. These liquids are other than industrial oil and include, for example, water, chemicals, etc. In this embodiment, the case where the liquid being added is water will be explained as an example.

[0018] One embodiment of the industrial oil regeneration method described herein is a method for regenerating industrial oil in a tank 20. First, an overview of the industrial oil regeneration method of this embodiment will be explained using the flowchart in Figure 2, and further details will be described later.

[0019] Step S10: In the industrial oil regeneration method according to one embodiment of the present disclosure, it is first determined whether the concentration of industrial oil inside the tank 20 is below a standard value. If the concentration of industrial oil inside the tank 20 is below the standard value, the process proceeds to step S20. On the other hand, if the concentration of industrial oil inside the tank 20 is not below the standard value, step S10 is repeated. In other words, the concentration of industrial oil inside the tank 20 is constantly monitored.

[0020] Step S20: When the concentration of industrial oil inside tank 20 falls below the standard value, the return pipe 11, which returns the industrial oil used to operate equipment 10 back to tank 20, is closed. Specifically, valve 21 is closed, stopping the supply of working oil from equipment 10 to tank 20. Similarly, pipe 12 connected to tank 20 is closed. Specifically, valve 22 is closed, stopping the supply of working oil from tank 20 to equipment 10.

[0021] Step S30: The temperature of the liquid inside the tank 20 is raised to a predetermined set temperature. The predetermined set temperature can be arbitrarily set within a range that is above the temperature at which the viscosity of the industrial oil becomes 50% of the viscosity at the ambient temperature where the tank 20 is installed, and below the boiling point of the liquid mixed in the tank 20.

[0022] Step S40: After standing for a predetermined time at a predetermined set temperature, the mixed liquid that has floated to the top of the tank 20 or settled at the bottom is discharged. Specifically, by opening the discharge valve 24, the mixed liquid that has floated to the top of the tank 20 or settled at the bottom is discharged.

[0023] Step S50: The return pipe 11 is opened. Specifically, the valve 21 is opened, which starts the supply of working oil to the tank 20. Similarly, the pipe 12 connected to the tank 20 is opened. Specifically, the valve 22 is opened, which starts the supply of working oil from the tank 20.

[0024] Thus, according to this embodiment, by raising the temperature according to the above criteria and letting it stand at a predetermined set temperature for a predetermined time, the industrial oil and the liquid are separated, and the mixed liquid that floats at the top of the tank or settles at the bottom is discharged to regenerate the industrial oil. Therefore, the oil deterioration can be minimized without having to outsource the work, thus improving the industrial oil regeneration technology.

[0025] In the method for regenerating industrial oil according to the present embodiment, the predetermined set temperature is not less than a temperature at which the viscosity of the industrial oil becomes 50% compared to the viscosity when the viscosity of the industrial oil is the ambient temperature at the installation location of the tank 20, and is less than the boiling point of the liquid mixed into the tank 20. In this regard, the inventors examined a method of removing the liquid from the tank 20 by raising the temperature of the industrial oil without boiling the liquid in the tank into which the liquid has been mixed. Here, in order to determine the target value of the temperature increase, the following Stokes' equation (1) was used for calculation.

[0026]

Equation

[0027] Generally, it is known that the viscosity η of oil decreases as the temperature rises. From Stokes' equation (1), the terminal velocity v s (hereinafter also referred to as the moving speed) of the water droplet 60 can be obtained. FIG. 3 is a schematic diagram showing the separation state of the working oil 50, the water droplet 60, and the water 70 in the tank 20. In the tank 20, assuming the diameter of the water droplet 60 mixed into the working oil 50 is D p , based on equation (1), the water droplet 60 moves at the terminal velocity v s and forms a phase of water 70 as time passes. FIG. 4 shows a graph of the relationship between the temperature of the working oil and the moving speed of the water droplets mixed into the working oil. As shown in FIG. 4, the higher the temperature, the faster the moving speed of the water droplets, and thus the time required for separation is shortened. For example, if the moving speed doubles, the time required for separation is halved.

[0028] Here, the relationship between the temperature and viscosity of the working oil is inversely proportional. Therefore, once the temperature of the working oil is raised to a certain extent, the efficiency of viscosity reduction due to heating decreases. Thus, it is necessary to set a lower limit within a range in which viscosity can be efficiently reduced. In this case, the efficiency does not change significantly within the range in which the viscosity of the working oil inside the tank 20 is less than half of the viscosity of the working oil at the ambient temperature of the installation location of the tank 20 (for example, 20°C). From this, the inventors decided to set the temperature at which the viscosity of the working oil inside the tank 20 is halved as the lower limit of heating.

[0029] On the other hand, it is preferable to set the upper limit of the temperature increase to a temperature at which the mixed liquid does not boil. Therefore, the inventors set the upper limit to be below the boiling point of the liquid mixed into the tank. Note that the upper limit of the temperature increase may be a temperature lower than the boiling point. For example, the upper limit of the temperature increase may be 10°C lower than the boiling point of the liquid mixed into the tank 20. In other words, the set temperature may be arbitrarily set within a range of 10°C or less below the boiling point of the liquid mixed into the tank 20. If the temperature exceeds the boiling point, the mixed liquid will boil, causing agitation in the tank and increasing the time required for separation by standing. Therefore, setting the temperature within a range of 10°C or less below the boiling point may more reliably prevent the liquid from boiling. Figure 5 is a graph showing the viscosity of the working oil and the range of a predetermined set temperature. As shown in Figure 5, the range of a predetermined set temperature is a temperature above which the viscosity of the industrial oil is 50% of the viscosity at the ambient temperature where the tank 20 is installed, and a temperature below which is 10°C lower than the boiling point of the liquid mixed into the tank 20. Furthermore, if multiple types of liquids are mixed in tank 20, the set temperature is adjusted based on the lowest boiling point among the multiple liquids. In this way, even when multiple types of liquids are mixed, a range is set in which none of the mixed liquids will boil.

[0030] Even within the upper and lower limits, if the temperature is high, quality degradation may occur depending on the type of oil. For example, fatty acid esters and phosphate esters undergo hydrolysis when heated. For working oils that are prone to degradation, it is desirable to raise the temperature to the lower limit of the heating temperature, where the viscosity is less than half of the viscosity at the ambient temperature of the tank 20's installation location, and then allow it to stand. On the other hand, in order to separate the oil from the mixed liquid in a short time, it is desirable to raise the temperature to near the upper limit and then allow it to stand. The upper limit is based on the boiling point, so the boiling point is determined taking into account the pressure inside the tank.

[0031] Figure 6 shows an overview of the inside of the tank 20 immediately after heating and after a predetermined time has elapsed. The working oil 50 in the tank 20 is heated by the heater 80. Immediately after heating, the working oil contains water droplets 60. After a predetermined time has elapsed, the working oil 50 and water 70 have separated into phases. The time required for phase separation depends on the set temperature, as described above. The time required for phase separation also depends on the height H of the tank 20, which corresponds to the distance traveled. Therefore, the predetermined time may be determined based on the set temperature and the tank height. Alternatively, the oil level height h may be used instead of the tank height H. In other words, the predetermined time may be determined based on the set temperature and the oil level height. Here, the oil level height h is the distance from the bottom of the tank to the oil level.

[0032] After heating and allowing the mixture to stand for a predetermined time, it is possible to discharge any mixed liquid (in this case, water) by draining the liquid through the waste valve. If the working oil becomes cloudy when the waste liquid is drained, it means that water has been mixed in. In such cases, extend the standing time and adjust it until the desired amount of water is achieved.

[0033] Specifically, for example, if the predetermined temperature is set to 80°C, the mixture can be left to stand for three days, after which the mixed water can be discharged through the waste liquid valve, and the moisture content can be reduced to the target value. Regarding the set temperature, it is acceptable as long as it falls within the above criteria, but it is desirable to determine the optimal heating temperature based on the amount of time that can be left to stand. Furthermore, if this work were to be outsourced, it would take about a week, so this method allows for liquid drainage in a shorter time than conventional methods.

[0034] (Variation 1) To alleviate the constraints on the amount of time that can be left undisturbed, it is conceivable to install a separate reserve tank 30 for switching. Figure 7 shows an overview of the piping system 2 equipped with the reserve tank 30. Piping system 1 includes equipment 10, tank 20, reserve tank 30, and oil cooler 40. The reserve tank 30 is used when maintaining tank 20, etc. In the return pipe 11, a valve 31 is provided between equipment 10 and reserve tank 30. The valve 31 closes or opens the flow of working oil from the return pipe 11 to the reserve tank 30. In the pipe 12, a valve 32 and an oil supply pump 33 are provided between the reserve tank 30 and the oil cooler 40. The valve 32 closes or opens the flow of working oil from the reserve tank 30 to pipe 12. The oil supply pump 33 pressurizes the working oil in pipe 12 and plays a role in circulating the working oil in piping system 1.

[0035] Under normal conditions, valves 21 and 22 of tank 20 are open, and valves 31 and 32 of the auxiliary tank 30 are closed. This allows tank 20 to store the working oil, which then circulates within the piping system 1. When maintenance, such as regeneration, is required for the working oil stored in tank 20, valves 21 and 22 are closed. At this time, valves 31 and 32 of the auxiliary tank 30 are opened, and the working oil in the auxiliary tank 30 circulates within the piping system 1. This ensures that even during maintenance, such as regeneration of the working oil in tank 20, the auxiliary tank 30 allows the working oil to circulate within the piping system 1 without stopping the operation of the equipment 10. Furthermore, the auxiliary tank 30 can alleviate the constraints on the amount of time that can be left undisturbed. When maintenance, such as regeneration, is required for the working oil stored in the auxiliary tank 30, valves 31 and 32 are closed. At this time, the working oil in the auxiliary tank 30 is regenerated using the same regeneration method as tank 20. In other words, the mixture is heated to a predetermined set temperature, left to stand at that temperature for a predetermined time, and then the contaminated liquid that has floated to the top or settled to the bottom of the reserve tank 30 is discharged. Specifically, by opening the discharge valve 34, the contaminated liquid that has floated to the top or settled to the bottom of the reserve tank 30 is discharged. By configuring the piping system 2 in this way, it is possible to alternately switch between the operating tank and the standing tank, thereby easing the constraints on the amount of time that can be left to stand, and maintaining the operation of the equipment 10.

[0036] (Modification 2) Here, when managing the piping system unmanned, it is desirable to be able to switch between the operating tank and the stationary tank automatically. Sensors, information processing devices, etc. may be used to perform automatic management, and each process may be executed automatically by these. Such an information processing device performs the regeneration process of industrial oil in the tank 20 that stores industrial oil in order to recycle the industrial oil used to operate the equipment 10. Below, Figure 8 shows an example of the configuration of the information processing device 100. As shown in Figure 8, the information processing device 100 comprises a control unit 101, a storage unit 102, an input unit 103, an output unit 104, and a communication unit 105.

[0037] The control unit 101 includes at least one processor, at least one dedicated circuit, or a combination thereof. The processor is a general-purpose processor such as a CPU (central processing unit) or GPU (graphics processing unit), or a dedicated processor specialized for a specific process. The dedicated circuit is, for example, an FPGA (field-programmable gate array) or an ASIC (application-specific integrated circuit). The control unit 101 controls each part of the information processing device 100 and executes processes related to the operation of the information processing device 100.

[0038] The storage unit 102 includes at least one semiconductor memory, at least one magnetic memory, at least one optical memory, or at least two combinations thereof. The semiconductor memory is, for example, RAM (random access memory) or ROM (read-only memory). The RAM is, for example, SRAM (static random access memory) or DRAM (dynamic random access memory). The ROM is, for example, EEPROM (electrically erasable programmable read-only memory). The storage unit 102 functions, for example, as a main memory, auxiliary memory, or cache memory. The storage unit 102 stores data used for the operation of the information processing device 100 and data obtained by the operation of the information processing device 100.

[0039] The input unit 103 includes at least one input interface. The input interface may be, for example, a physical key, a capacitive key, a pointing device, or a touchscreen integrated with a display. Alternatively, the input interface may be, for example, a sound sensor that accepts voice input, or a camera that accepts gesture input. The input unit 103 accepts operations to input data used for the operation of the information processing device 100. Instead of being integrated into the information processing device 100, the input unit 103 may be connected to the information processing device 100 as an external input device. Any connection method can be used, for example, USB (Universal Serial Bus), HDMI (High-Definition Multimedia Interface), or Bluetooth (Bluetooth).

[0040] The output unit 104 includes at least one output interface. The output interface is, for example, a display that outputs information as video, or a speaker that outputs information as sound. The display is, for example, an LCD (liquid crystal display) or an organic EL (electroluminescence) display. The output unit 104 outputs data obtained by the operation of the information processing device 100. Instead of being provided in the information processing device 100, the output unit 104 may be connected to the information processing device 100 as an external output device. Any connection method can be used, for example, USB, HDMI (registered trademark), or Bluetooth (registered trademark).

[0041] The communication unit 105 includes at least one external communication interface. The communication interface may be either a wired or wireless communication interface. In the case of wired communication, the communication interface may be, for example, a LAN (Local Area Network) interface or a USB (Universal Serial Bus) interface. In the case of wireless communication, the communication interface may be, for example, an interface compatible with mobile communication standards such as LTE (Long Term Evolution), 4G (4th generation), or 5G (5th generation), or an interface compatible with short-range wireless communication such as Bluetooth (registered trademark). The communication unit 105 receives data used for the operation of the information processing device 100 and transmits data obtained by the operation of the information processing device 100.

[0042] The functions of the information processing device 100 are realized by executing the program according to this embodiment on a processor corresponding to the control unit 101. In other words, the functions of the information processing device 100 are realized by software. The program causes the computer to perform the operations of the information processing device 100, thereby causing the computer to function as the information processing device 100. That is, the computer functions as the information processing device 100 by performing the operations of the information processing device 100 according to the program.

[0043] In this embodiment, the program can be recorded on a computer-readable recording medium. The computer-readable recording medium includes non-temporary computer-readable media, such as magnetic recording devices, optical discs, magneto-optical recording media, or semiconductor memory. The program can be distributed, for example, by selling, transferring, or lending portable recording media such as DVDs (digital versatile discs) or CD-ROMs (compact disc read-only memory) on which the program is recorded. Alternatively, the program may be distributed by storing it on the storage of an external server and transmitting it from the external server to other computers. The program may also be provided as a program product.

[0044] Some or all of the functions of the information processing device 100 may be implemented by a dedicated circuit corresponding to the control unit 101. In other words, some or all of the functions of the information processing device 100 may be implemented by hardware.

[0045] For example, at least one moisture meter may be installed inside the tank, and based on the moisture meter readings inside the tank 20, it may be detected that the concentration of industrial oil is below a standard value.

[0046] Figure 9 shows an example of a piping system 3 equipped with moisture meters 91 and 92 installed in tank 20 and auxiliary tank 30, respectively, and also with oil detection valves 25 and 35.

[0047] For example, the control unit 101 of the information processing device 100 may detect that the concentration of industrial oil is below a standard value based on the measurement value of the moisture meter 91 inside the tank 20. Any method may be used to acquire the measurement value of the moisture meter 91. For example, the control unit 101 may acquire the measurement value from the moisture meter 91 via the communication unit 105 and the network. Similarly, when performing regeneration processing on the spare tank 30, the control unit 101 may detect that the concentration of industrial oil is below a standard value based on the measurement value of the moisture meter 92 inside the spare tank 30.

[0048] Moisture meters 91 and 92 may be used to detect not only the amount of moisture present, but also whether sufficient time has been allowed to stand. In a tank 20 that has been left to stand at a set temperature, the industrial oil and water separate into two phases. Therefore, by placing multiple moisture meters 91 inside the tank 20, the phase separation state can also be detected. Specifically, for example, the phase separation state can be detected by the measured values ​​of each moisture meter installed at different positions in the height direction. The control unit 101 may notify the user of the elapsed time based on the measured values ​​of the moisture meters 91 inside the tank 20 that has been left to stand at a set temperature. Any method may be used for the notification process. For example, the control unit 101 may notify the user of the elapsed time by generating an alert sound using the output unit 104.

[0049] Furthermore, the drainage process may be automated by using an oil detection valve. An oil detection valve is a valve capable of detecting oil and water. For example, the control unit 101 of the information processing device 100 may, in the above-described drainage process (step S40), automatically stop the drainage process after the water, which is the mixed liquid, has been discharged, based on the measured values ​​of the oil detection valve 25 and the oil detection valve 35. Any method may be used to acquire the measured values ​​of the oil detection valve 25 and the oil detection valve 35. For example, the control unit 101 may acquire the measured values ​​from the oil detection valve 25 and the oil detection valve 35 via the communication unit 105 and the network.

[0050] When oil detection valves 25 and 35 are used, the process of letting the system stand at the set temperature may be omitted. In this case, oil detection valves 25 and 35 may be opened at regular intervals. In this case, a small amount of oil may be discharged, but it is possible to drain the liquid in the tank without considering the standing conditions.

[0051] On the other hand, it is also possible to automate the drainage process without using oil detection valves. For example, the liquid discharged from the discharge valves 24 and 34 may be photographed by a camera or the like, and the control unit 101 of the information processing device 100 may control the opening and closing of the discharge valves 24 and 34 based on the captured still or moving images. Alternatively, a sensor capable of detecting the type of liquid being drained may be used, and the control unit 101 may perform opening and closing control of the discharge valves 24 and 34 based on the detection results of the sensor.

[0052] Regarding wastewater, if a liquid with a specific gravity lighter than oil, such as ethanol, is mixed in, a drain hole must be installed at the top of the tank 20. Furthermore, a vacuum or similar device must be used to drain the wastewater from the top. Liquids with a specific gravity heavier than oil include water and glycerin. Therefore, the position of the discharge valve 24 may be adjusted as appropriate depending on the type of liquid being mixed in.

[0053] By appropriately combining the above elements, an automated piping system capable of draining liquid can be realized. Specifically, the information processing device 100 detects the inclusion of liquid and automatically switches from the operating tank 20 to the standby tank 30, which is a stationary tank from which the liquid has already been drained. The tank 20 containing the liquid is heated and left to stand until the moisture value of the moisture meter 91 attached to the tank 20 decreases. When the value of the moisture meter 91 decreases, the discharge valve 24 is opened to drain the liquid. After draining, the discharge valve 24 is closed when the liquid switches to oil. After that, the tank 20 remains in a standby state until a certain amount of moisture is mixed into the operating standby tank 30. By repeating the above cycle, it becomes possible to operate a piping system in the factory that can automatically drain liquid mixed in with the working oil.

[0054] While this disclosure has been described based on the drawings and embodiments, it should be noted that those skilled in the art may make various modifications and alterations based on this disclosure. Therefore, it should be noted that these modifications and alterations are within the scope of this disclosure. For example, the functions, etc., included in each component or step can be rearranged in a logically consistent manner, and multiple components or steps can be combined into one or divided into two.

[0055] For example, in the embodiment described above, it is also possible to have an embodiment in which the configuration and operation of the information processing device 100 are distributed among multiple computers that can communicate with each other. [Explanation of Symbols]

[0056] 1, 2, 3 Piping system 10 Equipment 11. Return piping 12, 13 Piping 20 tanks 21, 22 valves 23 Fuel pump 24 Exhaust valves 25 Oil detection valve 30 Reserve Tanks 31, 32 valves 33 Fuel pump 34 Exhaust valve 35 Oil detection valve 40 Oil Cooler 50 Working oil 60 water drops 70 water 91, 92 Moisture meter 91, 92 Oil detection valve 100 Information Processing Devices 101 Control Unit 102 Storage section 103 Input section 104 Output section 105 Communications Department

Claims

1. A method for recycling industrial oil in a tank that stores industrial oil for the purpose of circulating and reusing industrial oil used in the operation of equipment, When the concentration of industrial oil inside the tank falls below a standard value, the return pipe for returning the industrial oil used to operate the equipment back to the tank is closed. The temperature of the liquid inside the tank is raised to a set temperature that is 50% or higher than the viscosity of the industrial oil at the ambient temperature where the tank is installed, and below the boiling point of the liquid mixed in the tank. After allowing the tank to stand for a predetermined time at the set temperature, the mixed liquid that has floated to the top or settled to the bottom of the tank is discharged. A method for recycling industrial oils, including [specific components / materials].

2. A method for regenerating industrial oil according to claim 1, A method for regenerating industrial oil, comprising: providing at least one moisture meter inside the tank; detecting that the concentration of industrial oil is below a standard value based on the moisture meter reading inside the tank.

3. A method for regenerating industrial oil according to claim 1, A method for regenerating industrial oil, wherein the predetermined time is determined based on the set temperature and the tank height.

4. A method for regenerating industrial oil according to claim 1, A method for regenerating industrial oil, wherein at least one moisture meter is provided inside the tank, and the elapsed time is notified based on the moisture meter reading inside the tank, which has been left standing at the set temperature.

5. A method for regenerating industrial oil according to claim 1, A method for recycling industrial oil, wherein an oil detection valve is provided at the outlet for discharging the mixed liquid that floats at the top of the tank or settles at the bottom, and the oil detection valve automatically stops the discharge process after the mixed liquid has been discharged.

6. A method for regenerating industrial oil according to claim 5, A method for regenerating industrial oil, comprising automatically opening the oil detection valve at regular intervals.

7. An information processing device for performing a regeneration process of industrial oil in a tank that stores industrial oil for the purpose of circulating and reusing industrial oil used in the operation of equipment, comprising a control unit, the control unit being When the concentration of industrial oil inside the tank falls below the standard value, the return pipe for returning the industrial oil used to operate the equipment back to the tank is closed. The temperature of the liquid inside the tank is raised to a set temperature that is above the temperature at which the viscosity of the industrial oil becomes 50% of the viscosity at the ambient temperature of the tank's installation location, and below the boiling point of the liquid mixed into the tank. An information processing device that, after being left to stand for a predetermined time at a set temperature, discharges the mixed liquid that has floated to the top of the tank or settled to the bottom.

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