High-efficiency oil purification method based on high-voltage electric field adsorption method

Abstract

The invention belongs to the technical field of oil purification, and particularly relates to a high-efficiency oil purification method based on a high-voltage electric field adsorption method, and the method comprises the following steps: introducing an oil product to be purified into an oil purification container; a high-voltage alternating electric field is applied to the interior of the oil purification container, so that impurities in the to-be-purified oil product are ionized or polarized, non-water impurities pass through a filter material arranged in the oil purification container to be adsorbed to an electrode, and moisture in the impurities is coalesced and separated under the action of the electric field to form a collectable liquid accumulation layer; and through a filter material self-cleaning regeneration technology, adsorbed non-water impurities and moisture are directionally moved to a drain outlet of the oil purification container to be discharged, so that the purification of an oil product is realized. The technical problems that in the prior art, an oil purification mode is low in efficiency, poor in purification effect and high in purification cost are solved, the integrated purification function design is adopted, the function that one oil filtering device purifies multiple oil products is achieved, meanwhile, the filter material has the self-cleaning regeneration function, the service life of the filter material is prolonged, and the operation and maintenance cost is saved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of oil purification, and particularly relates to a high-efficiency oil purification method based on a high-voltage electric field adsorption method. BACKGROUND

[0002] In lubrication, insulation or cooling systems in many industries such as petroleum chemical industry, electronics, electric power, mine railway transportation, construction, metallurgy, medicine, food, mechanical processing, manufacturing, aerospace and military industry, and liquid cooling, various oil products such as lubricating oil and hydraulic oil have been widely used. However, during the use, processing, blending and storage of oil products, impurities such as water and various pollutant particles are easily mixed into the oil products due to factors such as pressure, friction, high temperature and environment. Such pollution is difficult to avoid, and the increase of foreign matters will affect the physical properties of the oil products such as viscosity, acid value and appearance, and even affect the safe operation of the lubrication, insulation or cooling system, and induce equipment failure. At the same time, in order to ensure safety, the oil products must be frequently replaced, which increases the operation cost, and therefore it is necessary to timely treat the oil products.

[0003] In order to prolong the service life of the oil products and reduce and prevent the harm caused by the pollutants in the oil products, the oil products need to be treated in time to filter and remove the pollutants and water in the oil products. In the prior art, a filter is arranged at the outlet of an oil pump to filter the impurities, but it relies on the natural separation of the oil tank for dehydration. If the water content in the oil increases, the water cannot be separated out within the effective residence time of the oil tank, causing the oil product to be emulsified, and the increase of water increases the generation of products. These depend on the filter of the equipment itself and cannot meet the requirements of the system for the oil products. There are countless pollutant particles with diameters of several hundred microns to zero point several microns in the oil products, and the industrial filter element cannot eliminate impurities below 10 microns, and the precision filtration can only reach an accuracy of 5 microns, and the effect of improving the quality of the oil products is limited.

[0004] With the continuous development of oil filtering technology, various types of oil filtering mainly adopts vacuum, plate and frame, centrifugal, pressurized filtration, electrostatic filter and the like.

[0005] The vacuum oil filter machine processes impurities by heating the oil products, which increases the thermal load of the system, and although the water removal performance is good, it leads to a substantial increase in energy consumption. At the same time, the equipment structure is complex, the operation and maintenance process is cumbersome, and professional personnel are needed to manage, which increases the labor cost and operation difficulty. Logically, heating the oil products may have adverse effects on the chemical properties of the oil products, and high energy consumption does not conform to the development trend of modern green environmental protection.

[0006] When the plate and frame filter is used to filter oil with many impurities, the motor is easy to be burned out due to excessive load. This is because when the impurity content in the oil is high, the filtration resistance increases significantly, and the motor needs to output more power to maintain the filtration process. Long time operation will easily cause the motor to be damaged. In addition, the filter has a large loss of oil during the filtration process, and the filter material is also consumed a lot, increasing the production cost of the enterprise. More importantly, it does not have the ability to remove water, gum impurities and particles smaller than the precision of the filter material, and cannot meet the complex filtration requirements, making it difficult to guarantee the quality of the filtered oil.

[0007] Although the centrifugal oil filter has good effect in removing free water and large particle impurities, due to its high-speed rotating working mode, it produces a lot of noise, causing serious interference to the working environment. At the same time, high-speed rotation also brings high safety risk and is easy to cause mechanical failure. Moreover, its filtration precision is not high, and the filtration effect of small particle impurities is not good, which limits its application in places with high requirements for oil quality.

[0008] The traditional pressurized mechanical filtration method has a long history of use, and users have rich experience. The filtration device has the advantages of high filtration precision, easy to use, high automation degree, etc.; however, the service life of the filter core is relatively short, and the filter core needs to be replaced frequently during work, which may also cause human pollution if not careful. In addition, the filter core type filtration device cannot effectively filter out water, oil sludge and other liquid products and particles smaller than the filter screen aperture in the oil.

[0009] The electrostatic oil filter allows oil to pass through two paths, with positive and negative electrodes placed in each path. One path is loaded with positive charge and the other path is loaded with negative charge. The pollutants in the oil will carry positive and negative charges after passing through, and then mix again and be attracted to each other to coagulate and grow. These small particles that are not easily intercepted by the filter core will be easily captured and intercepted by the pressure filter placed behind after growing in size. The balanced charge part only realizes the coagulation and growth of small particles, and cannot directly remove particle pollutants, but the high-precision filter core installed after the charging and mixing completes the real capture of particle pollutants. Similarly, there are the same problems of filter core replacement and high cost as in the pressurized mechanical filtration.

[0010] From the above analysis, it can be seen that the existing various oil filtration methods have many defects and cannot meet the purification requirements of higher efficiency, higher precision and lower cost. SUMMARY

[0011] In view of this, the purpose of the present application is to provide a high-efficiency oil purification method based on high-voltage electric field adsorption method, to solve the technical problems of low efficiency, poor purification effect and high purification cost in the prior art.

[0012] To solve the above problems, the application provides a high-efficiency oil purification method based on high-voltage electric field adsorption, which adopts the following technical scheme: The high-efficiency oil purification method based on high-voltage electric field adsorption comprises the following steps: Passing the oil to be purified into an oil purification container; Applying a high-voltage alternating electric field to the oil purification container to ionize or polarize the impurities in the oil to be purified, and adsorbing the non-water impurities on the electrode through the filter material arranged in the oil purification container, and the water is separated under the action of the electric field force, collides and merges into larger droplets on the surface of the filter material medium, and the large droplets gradually deposit or float to the bottom or top or side wall of the device under the action of gravity, electric field force or other forces, forming a collectable liquid layer; Through the filter material self-cleaning regeneration technology, the adsorbed non-water impurities and the collected liquid layer are moved to the blowdown port of the oil purification container to be discharged, so as to realize the purification of the oil.

[0013] Further, the high-voltage alternating electric field is generated by a transformer.

[0014] Further, the filter material adopts a distributed structure to generate a non-uniform electric field strength, and the dielectrophoresis force is used to make the neutral and uncharged particle pollutants migrate to the strong electric field area and be adsorbed.

[0015] Further, the filter material self-cleaning regeneration technology is realized by a non-ionizing chemical process under an external electric field, specifically: when the impurities accumulate on the surface of the filter material to a critical value, the charge repulsion effect makes the gum impurities desorb and suspend in the oil, and under the action of the external high-voltage alternating electric field, the water and gum impurities precipitated and accumulated are directionally moved to complete the self-regeneration of the filter material.

[0016] Further, the adsorption of the impurities is based on the principle of Maxwell's equations, and the Z potential difference between the water, gum impurities and mechanical impurities is used to realize separation through the electric field gradient and electric field force, so as to realize integrated purification of various different oils.

[0017] Further, the oil to be purified includes at least one of lubricating oil, hydraulic oil, gear oil and transformer oil; and the impurities include water, sulfur, acid, salt, mechanical impurities, colloidal substance, oil sludge and saponified substance.

[0018] Further, it further comprises the step of intelligent control, and the intelligent control comprises: Real-time monitoring of the temperature, pressure, water content and pollution degree of the oil to be purified; According to the monitoring data, the electric field strength, blowdown period and oil filtration equipment start-stop are automatically adjusted Further, the intelligent control is realized by a PLC controller, including setting a moisture on-line detection module, a particulate on-line detection module and an oil pump driving unit; the PLC controller realizes at least one of the following functions by collecting temperature, pressure, electric field intensity, moisture content, pollution degree data, fault signals and running state signals: automatically adjusting the alternating high voltage electric field intensity, automatically controlling the blowdown time, automatically controlling the clean oil time and triggering an alarm.

[0019] Further, the oil pollution degree detection adopts a liquid level relay, which detects the liquid level of the liquid tank and triggers the blowdown action when the liquid level reaches the high threshold value and stops the blowdown when the liquid level reaches the low threshold value.

[0020] The high-efficiency oil cleaning method based on the high-voltage electric field adsorption method has the following advantages: 1. The high-voltage alternating electric field is introduced into the clean oil container to ionize or polarize the impurities in the oil to be purified, the non-water impurities are adsorbed on the filter material arranged in the clean oil container, and the moisture is separated by coalescence under the action of the electric field. The method can realize integrated purification function, that is, one type of clean oil equipment can filter and process multiple types of oil, and can filter moisture and other impurities in the oil. The power consumption of the intelligent on-line oil filter using the method is not greater than 3kW, which solves the problem of high power consumption of vacuum oil filters and centrifugal oil filters.

[0021] 2. The filter material self-cleaning regeneration technology is adopted to realize the self-cleaning function of the filter material, and the filter material has no loss in one operating cycle, stable properties, no pollution to oil, long service life, greatly saving the operation and maintenance cost, and solving the problems of large consumption of plate and frame type, pressurized filtration type and electrostatic type oil filters, high cost and inability to filter small particles and moisture.

[0022] 3. The intelligent control mode is adopted, which has automatic detection function of oil pollution degree, can automatically adjust the working time and automatically protect according to the pollution degree detection value, has high intelligent degree, and has automatic protection functions of leakage, phase loss, short circuit and overcurrent. It has the functions of intelligence, automation, continuous operation and unattended operation, and is simple and convenient to operate. The intelligent labor management goal can be realized, and the daily management and labor cost can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The process flow chart for the application of the high-efficiency oil cleaning method based on the high-voltage electric field adsorption method to the intelligent on-line oil filter is shown. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.

[0025] The high-efficiency oil purification method based on the high-voltage electric field adsorption method provided by the present application includes the following steps: The high-efficiency oil purification method based on the high-voltage electric field adsorption method includes the following steps: The oil to be purified is introduced into the oil purification container; The transformer is used to apply a high-voltage alternating electric field to the oil purification container, so that the impurities in the oil to be purified are ionized or polarized, the non-water impurities are adsorbed onto the electrode through the filter material arranged in the oil purification container, the water in the impurities is separated under the action of the electric field, and the water droplets are collided and combined into larger droplets on the surface of the filter material medium, and the large droplets are gradually deposited or floated to the bottom, top or side wall of the device under the action of gravity, electric field force or other forces, forming a collectable liquid layer; The non-uniform electric field strength is formed by using the distributed regenerative filter material, the neutral and uncharged particle pollutants are attracted to one side of the strong electric field domain through dielectrophoresis force, and deep purification of the impurities is realized. The adsorbed non-water impurities and liquid layer are moved to the blowdown port of the oil purification container through the filter material self-cleaning regeneration technology, and the oil is purified. The purified oil is guided to the target system.

[0026] The principle of the above method will be described in detail below.

[0027] The oil purification container is a common filter tank or filter barrel, and the oil to be purified includes at least one of lubricating oil, hydraulic oil, gear oil and transformer oil; and the impurities include water, sulfur, acid, salt, mechanical impurities, colloidal substances, oil sludge and saponified substances.

[0028] When the booster applies an alternating high-voltage electric field to the oil purification container, the high-voltage alternating electric field ionizes or polarizes the water, gas, small particles and colloidal impurities in the oil, and the charged impurities are directionally moved and adsorbed on the surface of the filter material under the action of the electric field force, thereby realizing preliminary purification.

[0029] In this embodiment, the filter material adopts a distributed structure, and under the high-voltage alternating electric field, different regions of the filter material form non-uniform electric field strength, that is, strong electric field domains and weak electric field domains coexist, and the dielectric constant ε and Z potential difference of oil, water and impurities are utilized, so that even neutral and uncharged particle pollutants will also be attracted to the strong electric field region due to the gradient of the electric field domain, and the surface Z potential changes under the action of dielectrophoresis force, thereby realizing further purification.

[0030] Specifically, the high-voltage alternating electric field can stimulate dielectrophoresis force to capture neutral particles. In oil, the surface of contaminant particles such as water, mechanical impurities, and gum impurities is charged due to adsorbed ions, forming a Z potential. The Z potential, also known as the electrokinetic potential, is the potential difference between the slip surface and the bulk solution in the double electric layer on the surface of colloidal particles, reflecting the nature and strength of the surface charge of the particles. Due to the non-uniform electric field strength, a spatial gradient difference of the Z potential is generated on the surface of the impurity particles. The larger the gradient of the Z potential electric field domain, the stronger the dielectrophoresis force, and the more significant the attraction to neutral particles. Therefore, for neutral and uncharged particle pollutants such as some mechanical impurities and gum impurities, the area with high electric field strength will cause the particles to polarize to a higher degree, resulting in a larger dielectrophoresis force on both sides of the particles, driving the particles to move towards the strong electric field domain and be adsorbed by the filter material, achieving further purification. The above process is based on the principle of Maxwell's equations, and utilizes the Z potential difference of oil, water, gum impurities, mechanical impurities, etc. without distinguishing the type of oil, and can simultaneously remove multiple contaminants such as water, sulfur, acid, salt, gum, and mechanical impurities. The purification process is independent of the size of the contaminants and only related to the dielectric constant, so the present application does not rely on mechanical interception, avoiding the precision limitations of traditional filtration due to particle size. The method of the present application has a higher water particle size purification accuracy than the national standard, and a higher impurity particle purification accuracy below 0.1 μm than the NAS4 standard.

[0031] The pores of the filter core of the filter material of the traditional oil filter are gradually blocked by the filtered particles during use, and after blocking, it cannot be used continuously. Since the particles in the pores are difficult to remove, the filter material needs to be replaced regularly, resulting in high operating consumption and high cost of filtering oil. The filter material self-cleaning regeneration technology of the present application can realize the self-cleaning function of the filter material, and the filter material has no loss during one operating cycle, the filter material has stable properties, does not contaminate the lubricating oil, and has a long service life, greatly saving the operating and maintenance costs. In the present embodiment, the filter material self-cleaning regeneration technology is treated by a non-ionizing chemical special process through an applied electric field. When most of the impurities in the oil are removed, the charging characteristics of the excess positively or negatively charged ions in the oil will be purified by the filter material effect of the applied electric field, and the same charge repels each other, causing the gum impurities that have settled to a certain extent to fall off and re-suspend in the oil under the action of the high-voltage alternating electric field. Under the action of the applied electric field, the precipitated water and gum impurities continuously accumulate and move directionally towards the blowdown port of the clean oil container as the amount increases, completing the self-regeneration of the filter material. The precipitation and regeneration speeds are basically in a 1:1 ratio, and the filtered water, gum impurities, and mechanical impurities can be discharged through the blowdown port, the filtration efficiency is improved by 2-3 times, and the filter material replacement cycle can be up to 5 years or more.

[0032] The existing oil filter has low or no intelligence, which leads to complex process, many auxiliary equipment, complex operation and other problems, and needs manual supervision; manual operation is complex, and the filter material needs to be replaced frequently, which leads to low efficiency. The high-efficiency oil purification method based on high-voltage electric field adsorption method of the application further includes the step of intelligent control, adopts intelligent control mode, realizes one-key operation, automatic detection of pollution degree, on-site and remote indication of pollution, automatic adjustment of working point, automatic interlocking protection of system, automatic alarm and other functions, and can realize unattended operation.

[0033] Specifically, the intelligent control is realized by a PLC controller, the PLC controller can adopt a Siemens S7-200 SMARTPLC, and adaptive logic control is realized through programmable logic control circuit program design; meanwhile, a water content online detection module, a particulate matter online detection module, an oil pump driving unit, a temperature sensor, a pressure gauge and other components in communication connection with the PLC controller need to be arranged, so that temperature, pressure, electric field intensity, water content, pollution degree, fault signal and running state signal can be collected, and functions such as remote transmission, remote control and Internet of Things are realized. The PLC is internally provided with a timer and a counter, which are used for delay triggering, periodic control or production counting and other scenes, and are used for completing operations such as automatic adjustment of working time and control of blowdown time of the equipment. A PID control strategy is internally arranged, based on historical data, a control amount is continuously calculated and taken as an output to control closed-loop regulation of flow, pressure, temperature and the like. Running state, alarm information and the like of the equipment are stored, so as to facilitate fault diagnosis. Sound-light alarm or shutdown is triggered, and a fault code is recorded. The JYB series liquid level relay is mainly used for detecting the pollution degree of oil, the liquid level relay probe senses the position of the accumulated liquid tank, preset high and low water level thresholds are set, and the PLC program controls the start of blowdown when the high water level is reached and the stop of blowdown when the low water level is reached.

[0034] Through intelligent control, the operation and maintenance cost is greatly saved, the working efficiency and the safety of equipment operation are improved, the problems of complex manual operation and low efficiency in the prior art are solved, the intelligent reduction of personnel management target can be realized, and the daily management and labor cost are reduced.

[0035] The process flow of the high-efficiency oil purification method based on high-voltage electric field adsorption method of the application applied to a specific intelligent online oil filter is as follows Figure 1As shown, the oil to be purified in the user tank enters the inside of the intelligent online oil filter through the oil inlet path, and the oil to be purified is purified in the intelligent online oil filter by high-voltage alternating electric field adsorption method, during which the filter material maintains high-efficiency filtration through self-cleaning regeneration technology; the cleaned oil after treatment is discharged back to the user tank through the oil return path. The oil in the user tank enters the corresponding oil using equipment through the oil inlet path, and is re-injected into the tank through the oil using equipment, realizing the recycling of the purified oil. The water and impurities separated during the oil purification process are discharged through the blowdown port, and the intelligent control system automatically controls the blowdown time to ensure that the impurities are removed in time.

[0036] As can be seen from the above process, the intelligent online oil filter is designed in parallel with the user oil supply system, and purification can be completed without interrupting the operation of the user equipment, realizing parallel online continuous work and solving the problem of traditional oil filters that need to be shut down for processing.

[0037] The high-efficiency oil purification method based on high-voltage electric field adsorption method of the present application can complete the whole process of oil inlet, purification, oil return and blowdown through a single oil filter in practical application, and can simultaneously process multiple oil products and multiple impurities without the need for multiple equipment combinations, overcoming the limitations of traditional oil filters that require single oil and single filter or multiple equipment combinations, and improving the versatility, integration and efficiency.

[0038] It should be noted that the intelligent online oil filter realized based on the high-efficiency oil purification method of the present application has been successfully applied in industrial examples, verifying the effectiveness of the present application, and therefore, the high-efficiency oil purification method based on high-voltage electric field adsorption method of the present application is feasible and has high market application value.

[0039] The above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A highly efficient oil purification method based on high-voltage electric field adsorption, characterized in that, include: The oil to be purified is introduced into the oil purification container; A high-voltage alternating electric field is applied to the oil purification container to ionize or polarize the impurities in the oil to be purified. Non-aqueous impurities are adsorbed onto the electrodes by the filter material set in the oil purification container, and the water in the impurities is aggregated and separated under the action of the electric field to form a collectable liquid layer. Through the self-cleaning and regeneration technology of the filter media, the adsorbed non-aqueous impurities and liquid accumulation layer are directionally moved to the drain port of the clean oil container for discharge, thereby purifying the oil.

2. The high-efficiency oil purification method based on high-voltage electric field adsorption according to claim 1, characterized in that, The high-voltage alternating electric field is generated by a transformer.

3. The efficient oil purification method based on high-voltage electric field adsorption according to claim 1, characterized in that, The filter material adopts a distributed structure, which generates a non-uniform electric field strength. It uses dielectric electrophoresis to cause neutral and uncharged particulate pollutants to migrate to and be adsorbed in the strong electric field region.

4. The efficient oil purification method based on high-voltage electric field adsorption according to claim 3, characterized in that, The self-cleaning and regeneration technology of the filter media is achieved through a non-ionizing chemical process using an external electric field. Specifically, when impurities accumulate on the surface of the filter media to a critical value, the charge repulsion effect causes the colloidal impurities to desorb and suspend in the oil. Under the action of an external high-voltage alternating electric field, the precipitated water and colloidal impurities continuously accumulate and move directionally as the amount increases, thus completing the self-regeneration of the filter media.

5. The efficient oil purification method based on high-voltage electric field adsorption according to claim 1, characterized in that, The adsorption of impurities is based on the principles of Maxwell's equations. It utilizes the Z-potential difference between moisture, colloidal impurities, and mechanical impurities to achieve separation through electric field gradient and electric field force, thus realizing integrated purification of various oil products.

6. The efficient oil purification method based on high-voltage electric field adsorption according to any one of claims 1-5, characterized in that, The oil to be purified includes at least one of lubricating oil, hydraulic oil, gear oil, and transformer oil; the impurities include moisture, sulfur, acid, salt, mechanical impurities, colloids, sludge, and saponification.

7. The efficient oil purification method based on high-voltage electric field adsorption according to any one of claims 1-5, characterized in that, It also includes intelligent control steps, which include: Real-time monitoring of the temperature, pressure, moisture content, and contamination level of the oil to be purified; The system automatically adjusts the electric field strength, sewage discharge cycle, and start / stop of the oil filtration equipment based on monitoring data.

8. The efficient oil purification method based on high-voltage electric field adsorption according to claim 7, characterized in that, The intelligent control is achieved through a PLC controller, which includes setting up an online moisture detection module, an online particulate matter detection module, an oil pump drive unit, a temperature sensor, and a pressure gauge. The PLC controller collects temperature, pressure, electric field strength, moisture content, contamination level data, fault signals, and operating status signals to achieve at least one of the following functions: automatically adjusting the alternating high-voltage electric field strength, automatically controlling the sewage discharge time, automatically controlling the oil purification time, and triggering an alarm.

9. The efficient oil purification method based on high-voltage electric field adsorption according to claim 8, characterized in that, The detection of oil contamination level uses a liquid level relay. The liquid level relay detects the water level in the accumulation tank and presets high and low water level thresholds to trigger the sewage discharge action. When the water level reaches the high threshold, the sewage discharge is started, and when the water level reaches the low threshold, the sewage discharge is stopped.

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