Lubricating oil purification device and method for preventing oil sludge pollution of paint film of rotating equipment

Abstract

The lubricating oil purification device comprises a monitoring module, a purification module and a big data platform, the input ends of the monitoring module and the purification module are both connected with an oil liquid input port, the output ends of the monitoring module and the purification module are both connected with an oil liquid output port, the monitoring module is connected with the big data platform, and data transmission is conducted through an upper computer; the monitoring module comprises a granularity monitoring module, an oil product state monitoring module, a ferromagnetic abrasive particle monitoring module and a flow and pressure monitoring module, and the flow and pressure monitoring module is connected with the purification module; the purification module comprises a coarse filtration module, a pollutant charge coalescence module and a fine filtration module which are connected in sequence, and the pollutant charge coalescence module comprises two branches which are respectively a positive charge particle channel and a negative charge particle channel. Positive and negative charges are applied to different loop fluids, so that pollutant particles in oil are charged with opposite charges, and the charged particles attract each other and are gathered in the gathering process to form larger particles, so that the larger particles are more easily captured and cleared by a filter.

Description

Technical Field

[0001] The present invention relates to the technical field of purification systems, and particularly to a lubricating oil purification device for preventing paint film and sludge pollution of rotating equipment. Background Art

[0002] Paint film and sludge pollution are common problems in industrial equipment, especially in rotating equipment under high temperature, high pressure and complex operating environments. The paint film is an insoluble substance formed after the oxidation of lubricating oil, usually deposited on the equipment surface, resulting in problems such as reduced clearance, increased friction, and poor heat dissipation. In severe cases, it may even cause equipment damage or shutdown. For example, in equipment such as gas turbines, steam turbines, and compressors, paint film pollution has become an important factor affecting the normal operation of the equipment. It is estimated that about 80% of rotating equipment failures are caused by paint films.

[0003] The paint film not only reduces the performance of the equipment but also increases the maintenance cost. For example, the increase in journal bearing temperature and vibration fluctuations caused by the paint film may lead to equipment shutdown, resulting in huge economic losses. Therefore, developing effective paint film removal technologies is crucial for improving equipment reliability and extending service life.

[0004] The lubricating oil purification methods for removing paint film and sludge pollution of rotating equipment are mainly used for the maintenance and upkeep of industrial lubricating oil systems, especially in fields such as petrochemical, power generation, paper making, metallurgy, cement, shipbuilding, and machinery manufacturing. In these fields, rotating equipment such as compressors, turbines, and gearboxes often experience lubrication problems due to the accumulation of paint films and sludge, resulting in reduced equipment performance, increased failure rates, and increased energy consumption.

[0005] Previous products:

[0006] The formation of paint film and sludge is mainly related to the oxidation of lubricating oil. In a mechanical environment of high temperature, high pressure and high-speed rotation, organic compounds in the lubricating oil will undergo oxidation reactions to generate polar substances such as aldehydes, ketones, acids and polycondensation products. These polar substances gradually aggregate and precipitate on the metal surface, forming paint film or sludge.

[0007] The paint film is usually generated during the oxidation of lubricating oil as the temperature rises. It is a polymer of high molecular weight hydrocarbons, with a certain hardness and gloss, and is insoluble in oil. The color of the paint film ranges from light brown to dark brown, and it easily adheres to metal surfaces such as bearings and gears, resulting in a decline in equipment performance.

[0008] The sludge is formed by the polymerization of organic residues in the lubricating oil under certain conditions. It usually contains moisture and is generated at a lower temperature, so it is more likely to form in hydraulic systems. The color of the sludge is generally gray, brown or amber, and usually appears in components such as hydraulic pumps, valves and bearings.

[0009] The previous methods for purifying paint films and sludge in products mainly included the following:

[0010] 1. Filtration method: Remove fine particles and suspended solids in the oil by using ultrafiltration equipment. This method can effectively remove sludge in the oil, but it is prone to filter clogging. And it cannot effectively remove insoluble paint films and sludge.

[0011] 2. Ion exchange method: Use ion exchange resin to selectively adsorb antioxidants and base oil degradation products to remove dissolved soft pollutants. Although this method has remarkable effects, it has a high cost. And it cannot effectively remove insoluble paint films and sludge.

[0012] 3. Electrostatic purification method: Use the electrostatic field force to adsorb particles in the oil on the dust collector to remove fine particle pollutants in the oil. This method is widely used abroad and has remarkable effects on removing soluble and insoluble paint films and sludge, but there is residual electricity in the oil, which endangers the safety of the equipment.

[0013] An oil system paint film online removal device and method with the patent publication number of CN105864622B specifically discloses that the oil system paint film online removal device includes a filter oil tank for connecting the oil system. The inlet of the filter oil tank is connected to the oil circuit of the oil system through an oil inlet pipeline, and the outlet of the filter oil tank is connected to the oil tank of the oil system through an oil outlet pipeline; a suction pump for pumping the faulty oil in the oil circuit of the oil system into the filter oil tank, and the suction pump is arranged on the inlet pipeline; a metal heat sink for reducing the temperature of the oil in the filter oil tank, and the metal heat sink is arranged in the filter oil tank; a heat exchange pipe for introducing refrigerant into the metal heat sink, and a circulation pump for circulating the refrigerant is arranged on the heat exchange pipe; an exhaust valve arranged at the top of the filter oil tank. The oil system paint film online removal device of the present invention can eliminate paint films, thus solving the paint film faults of the oil system, improving the safe operation of the equipment, and having a low cost at the same time.

[0014] A method for optimizing and improving the control oil film of a gas turbine with the patent publication number of CN115751149A specifically includes the following steps: Step 1: The oil is led out of the oil tank, pressurized by a control oil pump and enters each valve group and filter, and the control oil forms a loop circulation; Step 2: Adopt the method of online cleaning: Add additives accounting for 3-7% of the oil tank volume to the oil tank for cleaning; Step 3: Add additives accounting for 3-7% of the oil tank volume to the oil tank for cleaning again; Step 4: Verify the dissolution ability of the additives through the paint film tendency index. By adding additives (oil sludge cleaner Revive), the decontamination speed is fast and the precision is high (pollutants with a size of 0.02 μm can be removed), and through the flow of oil particles, all the oil sludge impurities and oxides attached to the oil tank, pipe wall and components are washed, adsorbed and carried out, and the oil sludge, paint film and colloidal dirt adhered to the inner surface of the system are actively removed, playing a role in cleaning the system.

[0015] For the above existing solutions, the following deficiencies exist:

[0016] Deficiency 1:

[0017] The electrostatic adsorption technology mainly makes the particles in the oil liquid charged through a high-voltage electrostatic field and then adsorbs them onto the dust collector. However, if the electrostatic adsorption device is not properly designed or maintained insufficiently, it may lead to a decrease in the insulation performance inside the device, thus causing a breakdown phenomenon and damaging the device. In addition, an excessively high current density may be generated during the electrostatic adsorption process, resulting in local overheating and further damaging the device. At the same time, electrostatic discharge may occur during the electro-adsorption process, triggering the combustion or explosion of flammable and explosive gases.

[0018] Deficiency 2:

[0019] The ion exchange technology mainly treats dissolved paint film sludge and removes the dissolved colloids in the oil liquid through the selective adsorption of specific resins. However, this method has limited effect on non-dissolved paint film sludge (such as solid particles deposited on the metal surface). These solid particles may not be effectively removed by the ion exchange resin, resulting in the accumulation of paint film sludge on the device surface, further aggravating the equipment wear and failure risk. And the ion exchange method has a higher cost compared with other methods.

[0020] Deficiency 3:

[0021] At present, the products on the market all have the problems of a small control threshold and non-adjustable monitoring and purification cycles, resulting in the homogenization of the oil liquid monitoring scheme under different working conditions, over-purification and under-purification of the purification scheme, which may lead to damage to the additives in the oil liquid and a reduction in the oil liquid life, or accidents such as paint film and sludge deposition due to under-purification. And the non-adjustability of the monitoring and purification scheme will cause excessive wear of the filter element, particle size monitoring unit, etc.

[0022] Therefore, in view of the problems in the related technology, there is an urgent need to propose an effective solution. Summary of the Invention

[0023] (1) Technical problems to be solved

[0024] In view of the deficiencies of the existing technology, the present invention provides a lubricating oil purification device for preventing the pollution of paint film sludge on rotating equipment, and solves the technical problems that the existing oil liquid filtration method is prone to cause filter clogging, unable to remove non-dissolved paint film and sludge; high cost; and endangering the safety of the equipment.

[0025] (2) Technical solutions

[0026] The present invention provides the following technical solution: A lubricating oil purification device for preventing paint film and sludge pollution of rotating equipment, including a monitoring module, a purification module, and a big data platform. The monitoring module is connected to the purification module. The input ends of the monitoring module and the purification module are both connected to the oil inlet, and the output ends are both connected to the oil outlet. The monitoring module is connected to the big data platform, and data transmission is carried out through a host computer.

[0027] The monitoring module includes a particle size monitoring module, an oil product state monitoring module, a ferromagnetic abrasive particle monitoring module, and a flow and pressure monitoring module. The flow and pressure monitoring module is connected to the purification module.

[0028] The purification module includes a coarse filtration module, a pollutant charge coalescence module, and a fine filtration module connected in sequence. The pollutant charge coalescence module includes two branches, namely a positive charge particle path and a negative charge particle path.

[0029] Preferably, a plurality of oil monitoring sensors are provided in the monitoring module, which can monitor various oil state parameters.

[0030] Preferably, the monitoring module can monitor particulate matter, metal abrasive particles, water in oil, trace water, viscosity, dielectric constant, temperature, and density parameters in the oil, as well as monitor the flow and pressure of the oil in the purification module.

[0031] Preferably, a coarse filtration filter element is provided in the coarse filtration module, which can filter particulate matter with a size greater than 10 μm. A fine filtration filter element is provided in the fine filtration module, which can filter particulate matter with a size greater than 3 μm.

[0032] Preferably, a positive electrode is provided on the positive charge particle path, and a negative electrode is provided on the negative charge particle path, so that the tiny particulate matter in the oil carries positive charges and negative charges. The tiny particulate matter with positive charges and the tiny particulate matter with negative charges converge in the same oil path and enter the fine filtration module for filtration.

[0033] The present invention also provides a lubricating oil purification method for preventing paint film and sludge pollution of rotating equipment, including the following steps:

[0034] S1: The pump machine pumps external oil into the monitoring module and the purification module respectively.

[0035] S2: The oil in the monitoring module flows through the particle size monitoring module, the oil product state monitoring module, and the ferromagnetic abrasive particle monitoring module in sequence, and the real-time purification degree and health status of the oil are monitored through the above monitoring modules.

[0036] S3: The oil in the purification module flows through the coarse filtration module, then through the pollutant charge coalescence module, and finally, the particulate matter is filtered out through the fine filtration module.

[0037] S4: Finally, the basic data in the monitoring module is retrieved through the big data platform, and the data is transmitted to the upper computer for oil quality analysis and early warning. The real-time status of the oil that changes with time is analyzed using the data algorithm model. Then, the oil pollution history record is referred to to infer the degree of loss or performance degradation curve of the oil quality in the next task time period. The early warning threshold is set according to the changing trend of the monitoring data.

[0038] Preferably, in step S3, when the oil flows through the pollutant charge aggregation module, particles with a size smaller than 1 μm will be attached with positive charges and negative charges respectively. During the aggregation process, small particles with opposite charges will attract each other to form particles with a size larger than 3 μm, which are then filtered through the fine filtration module. Finally, the purified oil is transported back to the cleaning circuit.

[0039] (III) Beneficial effects

[0040] Compared with the prior art, the present invention provides a lubricating oil purification device for preventing paint film and sludge pollution of rotating equipment, which has the following beneficial effects:

[0041] 1. The lubricating oil purification device for preventing paint film and sludge pollution of rotating equipment applies positive and negative charges to different circuit fluids, so that the pollutant particles in the oil are charged with opposite charges. These charged particles will attract each other and aggregate during the aggregation process to form larger particles, which are easier to be captured and removed by the filter. This method is particularly suitable for removing micron-level colloids, paint films, sludge and other pollutants. Compared with electrostatic adsorption technology, the attraction of positive and negative charges will make large particles uncharged, thereby ensuring the safety of the equipment.

[0042] 2. By using additional monitoring and big data platforms, the analysis of oil data to assist purification can help ensure the safety of the purification module, while helping to improve the oil purification solution and ensure the effectiveness of oil purification; through online monitoring sensors, real-time monitoring of the oil status can be achieved, including parameters such as viscosity, water content, and contamination. When it is detected that the oil index is out of the normal range, the system will immediately start the automatic purification program to restore the oil to the ideal state, thereby avoiding equipment failure or shutdown due to oil problems; in addition, the big data platform can conduct in-depth analysis of the collected oil data, establish an early warning model through machine learning algorithms, and predict potential equipment failures and deterioration trends. This predictive maintenance can take measures in advance, reduce unexpected downtime, and improve the reliability and safety of equipment operation.

[0043] 3. Based on big data analysis, the purification strategy can be optimized; the purification efficiency can be improved, and the energy consumption and maintenance costs can be reduced. The big data platform provides powerful data visualization functions, which can intuitively display key indicators such as the pollution change trend and purification effect of the oil fluid; this not only helps the operation and maintenance personnel better understand the equipment operation status, but also provides targeted improvement suggestions. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 FIG. is a schematic diagram of the working principle of an embodiment of a lubricating oil purification device for preventing paint film and sludge pollution of rotating equipment according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0045] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0046] As introduced in the background art, there are deficiencies in the prior art. To solve the above technical problems, the present application proposes a lubricating oil purification device and method for preventing paint film and sludge pollution of rotating equipment.

[0047] Please refer to Figure 1 , a lubricating oil purification device for preventing paint film and sludge pollution of rotating equipment, including a monitoring module, a purification module, and a big data platform. The monitoring module is connected to the purification module. The input ends of the monitoring module and the purification module are both connected to the oil fluid input port, and the output ends are both connected to the oil fluid output port. The monitoring module is connected to the big data platform, and data transmission is carried out through a host computer.

[0048] The monitoring module of the present invention includes a particle size monitoring module, an oil product state monitoring module, a ferromagnetic abrasive particle monitoring module, and a flow rate and pressure monitoring module. The flow rate and pressure monitoring module is connected to the purification module. It can monitor parameters such as particle size, metal abrasive particles, moisture in oil, micro moisture, viscosity, dielectric constant, temperature, density, etc., and monitor the oil fluid flow rate and pressure in the purification module.

[0049] Particle size is an important indicator to measure the content of solid pollutants in lubricating oil and reflects the wear condition of the equipment. The detection of ferromagnetic abrasive particles can reflect the wear and fatigue state of the surface of mechanical components and is an important parameter for judging the health status of the equipment. When the particle size or ferromagnetic abrasive particles exceed the standard, it indicates that the equipment may have abnormal wear, and it is necessary to maintain or replace the lubricating oil in time to avoid failures.

[0050] Moisture content is one of the key factors affecting the performance of lubricating oil. Moisture can cause the lubricating oil to emulsify, reduce its lubricating effect, and accelerate the aging of the oil product. Therefore, monitoring the moisture content can effectively prevent equipment failures caused by moisture and ensure the normal service life of the lubricating oil.

[0051] Viscosity is an important indicator to measure the fluidity and lubricating ability of lubricating oil. Too high or too low viscosity will affect the normal operation of the equipment, resulting in increased friction or insufficient lubrication. By monitoring the viscosity, the deterioration or contamination of the oil product can be detected in a timely manner, and corresponding measures can be taken.

[0052] The change of dielectric constant can reflect the degree of contamination and quality change of lubricating oil. For example, moisture, acid value, and metal abrasives will all significantly affect the dielectric constant. Therefore, monitoring the dielectric constant can be used as an important means to evaluate the deterioration and contamination of the oil product.

[0053] The temperature of the lubricating oil directly affects its viscosity and performance. Too high a temperature will cause the viscosity of the lubricating oil to decrease and reduce the lubricating effect, while too low a temperature may make the fluidity of the lubricating oil poor. Therefore, monitoring the temperature helps to ensure that the lubricating oil operates within an appropriate working range.

[0054] The change of density can reflect the accumulation of pollutants in the lubricating oil. For example, as the oil product ages or the contamination worsens, the density will gradually increase. By monitoring the density, the quality and usage status of the oil product can be indirectly evaluated.

[0055] The purification module of the lubricating oil purification device of the present invention includes a coarse filtration module, a pollutant charge coalescence module, and a fine filtration module connected in sequence. The pollutant charge coalescence module includes two branches, namely a positive charge particle path and a negative charge particle path. A coarse filtration filter element is provided in the coarse filtration module, which can filter particles with a size greater than 10 μm. A fine filtration filter element is provided in the fine filtration module, which can filter particles with a size greater than 3 μm. A positive electrode is provided on the positive charge particle path, and a negative electrode is provided on the negative charge particle path, so that the tiny particles in the oil fluid carry positive charges and negative charges. The tiny particles with positive charges and the tiny particles with negative charges converge in the same oil path and enter the fine filtration module for filtration.

[0056] Specifically, the purification module can promptly remove impurity particles and moisture in the lubricating oil, thereby preventing the formation of paint films and sludge. The coarse filtration module preliminarily filters the oil fluid, intercepting relatively large impurity particles, such as metal chips, dust, etc., to prevent them from entering subsequent more precise filtration equipment and causing filter element blockage. And it further conducts water treatment on the oil fluid to avoid rusting and maintain viscosity stability. The pollutant charge coalescence module is divided into two branches, with electrodes provided on each branch to respectively make the tiny particles (with a size less than 1 μm) in the lubricating oil carry positive charges and negative charges. Then the two branches merge into the same oil circuit. At this time, the tiny particles with positive charges and the particles with negative charges attract and aggregate with each other to form solid particles with a larger size. Finally, through the fine filtration module, the larger particles are filtered out.

[0057] The present invention also provides a lubricating oil purification method for preventing paint film and sludge pollution of rotating equipment, including the following steps:

[0058] S1: The pump machine separately extracts the external oil fluid into the monitoring module and the purification module;

[0059] S2: The oil fluid in the monitoring module sequentially flows through the particle size monitoring module, the oil product state monitoring module, and the ferromagnetic abrasive particle monitoring module. Through the above monitoring modules, the real-time purification degree and health status of the oil fluid are monitored, and then the flow rate and pressure data of the flow rate and pressure monitoring module are monitored; this monitoring module can monitor values such as the particle size, ferromagnetic abrasive particles, moisture in the oil, micro water, viscosity, dielectric constant, temperature, density, etc. of the lubricating oil; and by monitoring the flow rate and pressure data of the purification module, the normal operation of the purification module is ensured.

[0060] S3: The oil fluid in the purification module flows through the coarse filtration module, then through the pollutant charge coalescence module. Finally, the particulate matter is filtered out through the fine filtration module; the coarse filtration module first filters the particulate matter with a size greater than 10 μm. When the oil fluid flows through the pollutant charge coalescence module, the particulate matter with a size less than 1 μm will be respectively attached with positive charges and negative charges. During the aggregation process, the small particulate matter with opposite charges will attract each other to form particulate matter with a size greater than 3 μm, and then it is filtered through the fine filtration module. Finally, the purified oil fluid is conveyed back to the clean circuit. Through the coarse filtration module, the pollutant charge coalescence module, and the fine filtration module, the oil fluid is filtered to achieve the purpose of removing oil fluid pollution and can also remove pollutant particles at the submicron level.

[0061] S4: Finally, the basic data in the monitoring module is retrieved through the big data platform, and the data is transmitted to the host computer for oil quality analysis and early warning. Using the data algorithm model, the real-time state of the oil over time is analyzed, and then the loss degree or performance degradation curve of the oil quality in the next task time period is inferred and predicted with reference to the historical record of oil pollution. According to the change trend of the monitoring data, the early warning threshold is set. For example, when the number of ferromagnetic wear particles exceeds a certain range, the user is prompted to perform maintenance, which can realize the early prediction of the lubrication state of the equipment and provide support for timely replacement of lubricating oil and changing the oil purification frequency and purification plan.

[0062] The lubricating oil purification device also has the following characteristics:

[0063] 1. By applying positive and negative charges to the fluid in different circuits, the pollutant particles in the oil are charged with opposite charges. These charged particles will attract and aggregate with each other during the aggregation process, forming larger particles, which are thus more easily captured and removed by the filter. This method is particularly suitable for removing pollutants such as micron-sized gum, paint film, and sludge. Compared with the electrostatic adsorption technology, the attraction of positive and negative charges makes the large particles uncharged, thus ensuring the safety of the equipment.

[0064] 2. Compared with a single purification module, the additional use of monitoring and big data platform to analyze oil data for auxiliary purification can help ensure the operation safety of the purification module, and at the same time help improve the oil purification plan and ensure the effectiveness of oil purification; through the on-line monitoring sensor, the real-time monitoring of the oil state can be realized, including parameters such as viscosity, water content, and pollution degree. When it is detected that the oil index exceeds the normal range, the system will immediately start the automatic purification program to restore the oil to the ideal state, thus avoiding equipment failure or shutdown due to oil problems.

[0065] 3. The big data platform can deeply analyze the collected oil data, establish an early warning model through machine learning algorithms, and predict potential equipment failures and deterioration trends. This predictive maintenance can take measures in advance to reduce unexpected downtime and improve the reliability and safety of equipment operation. Based on big data analysis, the purification strategy can be optimized, such as adjusting the working mode and parameter settings of the purification module to adapt to different working environments and requirements. This not only improves the purification efficiency, but also reduces energy consumption and maintenance costs. The big data platform provides a powerful data visualization function, which can intuitively display key indicators such as the pollution change trend and purification effect of the oil. This not only helps the operation and maintenance personnel better understand the equipment operation status, but also provides targeted improvement suggestions.

[0066] Compared with the prior art, the present invention also has the following advantages:

[0067] 1. Compared with the lubricating oil purification solution based on electrostatic adsorption, this solution has stronger cleaning power for paint films and sludge. This technology can effectively remove particulate pollutants in the range of 0.1 μm to sub-micron level, while electrostatic adsorption technology usually can only handle larger particulate matters above a few microns. The common back-corona phenomenon in electrostatic adsorption technology is effectively alleviated in this solution. By adjusting the charge distribution, the local aggregation of charged particles is reduced. This solution has stronger adaptability to the aqueous environment and can maintain good purification effect under large flow conditions, which makes this solution perform more superiorly than the electrostatic adsorption purification solution when dealing with the oil in a large fuel tank.

[0068] 2. Compared with the traditional purification solution, this solution is more flexible and controllable. The oil fluid big data platform can establish a model to analyze the lubricating oil quality and deterioration trend, and form a comprehensive lubricating oil status database; through big data analysis, the equipment lubrication strategy can be optimized, the equipment life can be extended and the maintenance cost can be reduced. For example, by using the big data platform, the long-term accumulated monitoring data can be deeply analyzed to predict equipment failures and optimize the oil change cycle and coordinate the purification frequency. By analyzing the types and concentrations of pollutants in the lubricating oil, a targeted purification solution can be formulated, and new purification modules such as high-efficiency demulsification and oil-water separation technology combinations can be added.

[0069] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A lubricating oil purification device for preventing paint film and sludge pollution of rotating equipment, characterized in that: It includes a monitoring module, a purification module and a big data platform, wherein the monitoring module is connected to the purification module, the input ends of the monitoring module and the purification module are both connected to the oil input port, and the output ends are both connected to the oil output port, and the monitoring module is connected to the big data platform, and data transmission is performed through the host computer; The monitoring module includes a particle size monitoring module, an oil condition monitoring module, a ferromagnetic wear particle monitoring module and a flow and pressure monitoring module, and the flow and pressure monitoring module is connected to the purification module; The purification module comprises a coarse filtration module, a pollutant charge aggregation module and a fine filtration module which are connected in sequence. The pollutant charge aggregation module comprises two branches, which are a positive charge particle passage and a negative charge particle passage.

2. The lubricating oil purification device for preventing paint film and sludge pollution of rotating equipment according to claim 1 is characterized in that: The monitoring module is provided with a plurality of oil monitoring sensors, which can monitor a variety of oil status parameters.

3. The lubricating oil purification device for preventing paint film and sludge pollution of rotating equipment according to claim 1 is characterized in that: The monitoring module can monitor particulate matter, metal abrasive particles, water content, micro-water, viscosity, dielectric constant, temperature and density parameters in the oil, as well as monitor the flow rate and pressure of the oil in the purification module.

4. The lubricating oil purification device for preventing paint film and sludge pollution of rotating equipment according to claim 1 is characterized in that: The coarse filter module is provided with a coarse filter element, which can filter particles with a size greater than 10 μm, and the fine filter module is provided with a fine filter element, which can filter particles with a size greater than 3 μm.

5. The lubricating oil purification device for preventing paint film and sludge pollution of rotating equipment according to claim 1 is characterized in that: A positive electrode is provided on the positively charged particle path, and a negative electrode is provided on the negatively charged particle path, so that the tiny particles in the oil have positive and negative charges. The positively charged tiny particles and the negatively charged tiny particles merge in the same oil path and enter the fine filtration module for filtration.

6. A lubricating oil purification method for preventing paint film sludge contamination of rotating equipment, comprising the following steps: S1: The pump draws external oil into the monitoring module and purification module respectively; S2: The oil in the monitoring module flows through the particle size monitoring module, the oil condition monitoring module and the ferromagnetic wear particle monitoring module in sequence, and the real-time purification degree and health status of the oil are monitored through the above monitoring modules; S3: The oil in the purification module flows through the coarse filtration module, then flows through the pollutant charge agglomeration module, and finally, passes through the fine filtration module to filter out particulate matter; S4: Finally, the basic data in the monitoring module is retrieved through the big data platform, and the data is transmitted to the upper computer for oil quality analysis and early warning. The real-time status of the oil that changes with time is analyzed using the data algorithm model. Then, the oil pollution history record is referred to to infer the degree of loss or performance degradation curve of the oil quality in the next task time period. The early warning threshold is set according to the changing trend of the monitoring data.

7. The lubricating oil purification method for preventing paint film and sludge pollution of rotating equipment according to claim 6 is characterized in that: In step S3, when the oil flows through the pollutant charge aggregation module, particles smaller than 1 μm will be attached with positive charges and negative charges respectively. During the aggregation process, small particles with opposite charges will attract each other to form particles larger than 3 μm, which are then filtered through the fine filtration module. Finally, the purified oil is transported back to the cleaning circuit.

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