Electrosorption purification system for hydraulic oil

Abstract

The application discloses a kind of electro-adsorption purification systems of hydraulic oil, it is related to the technical field of purification system, for solving the technical problem that existing purification technology cannot consider energy saving, good filtering effect and applicability, a kind of electro-adsorption purification systems of hydraulic oil, including waste oil storage tank, centrifuge, demulsification dehydration filter component, ferromagnetic filter, electro-adsorption refining filter, membrane system, purified oil storage tank;Oil inlet pump is arranged between the waste oil storage tank and the centrifuge, the electro-adsorption refining filter component is connected with membrane system, the membrane system is connected with a plurality of purified oil storage tanks;Recycle pipeline is provided with circulating pump and backwashing tank.This series of set technology can significantly improve oil quality index, improve adsorption effect, with good filtering effect;The application simultaneously has the advantages of energy saving, good filtering effect and strong applicability, solves the technical problem that existing purification technology cannot consider energy saving, good filtering effect and applicability.

Description

Technical Field

[0001] This invention relates to the field of purification system technology, and in particular to an electro-adsorption purification system for hydraulic oil. Background Technology

[0002] Hydraulic oil is the hydraulic medium used in hydraulic systems that utilize liquid pressure energy. It plays a role in energy transmission, anti-wear, system lubrication, corrosion prevention, rust prevention, and cooling in hydraulic systems. Controlling the contamination of hydraulic oil is crucial for the normal operation of hydraulic systems.

[0003] The main contaminants in hydraulic oil include: solid contaminants (such as iron filings) remaining after the wear of hydraulic components; water contamination caused by humid air, transportation, pumping, and immersion during use; and oxides inevitably generated due to the increased temperature of the hydraulic system. According to incomplete statistics, 60%-70% of hydraulic system failures are caused by solid particulate contamination, and 1% water contamination can accelerate component wear by 2.5 times. Oxide contamination not only accelerates the aging and deterioration of hydraulic oil but can also produce adhesive residue and varnish, clogging oil passages. Therefore, the purification of hydraulic oil is essential.

[0004] Furthermore, existing research has shown that using waste oil recycling technology to regenerate 1 ton of waste lubricating oil can save 7-9 tons of crude oil, resulting in energy savings of 50%-80% and a reduction in CO2 emissions of approximately 50%. Therefore, the purification of waste lubricating oil also brings considerable economic, environmental, and social benefits, leading to the development of waste lubricating oil purification technologies.

[0005] Currently, the main technologies for hydraulic oil contamination control include:

[0006] High-precision glass fiber filter cartridges are used for filtration, but the cartridges are prone to clogging, require frequent replacement, and consume a large amount of consumables.

[0007] Electrostatic filtration has low purification efficiency and is not suitable for treating hydraulic oil with a water content greater than 0.05%.

[0008] Centrifugal filtration offers fast purification, but it has low filtration precision and cannot remove emulsified water.

[0009] Coalescing filters are prone to clogging in hydraulic oils with high solid contaminant content, and have a low water removal rate.

[0010] Vacuum dehydration has high precision in removing moisture, but it consumes a lot of energy and is inefficient.

[0011] In addition, both coalescence and vacuum dehydration require heating the hydraulic oil to 60-80℃ to achieve the dehydration effect. Higher temperatures can also cause the hydraulic oil to oxidize and deteriorate further, which is detrimental to the operation of the equipment.

[0012] It is evident that current filtration methods all have their own shortcomings. Some are energy-intensive, some are ineffective, and some have poor applicability. Overall, existing technologies cannot simultaneously achieve energy saving, good filtration effect, and good applicability, lacking a purification system that is energy-efficient, has good filtration effect, and is highly applicable. Therefore, developing a hydraulic oil purification technology that is energy-efficient, has good filtration effect, and is easy to use is not only crucial for the safe operation of hydraulic systems but also has significant scientific and practical value.

[0013] Therefore, in view of the shortcomings of the above-mentioned solutions in actual production and implementation, modifications and improvements have been made. At the same time, in the spirit and concept of seeking the best, and with the assistance of professional knowledge and experience, and after a lot of ingenuity and experimentation, this invention was created. It provides an electro-adsorption purification system for hydraulic oil to solve the technical problem that existing purification technologies cannot simultaneously achieve energy saving, good filtration effect and applicability. Summary of the Invention

[0014] The purpose of this invention is to provide an electro-adsorption purification system for hydraulic oil, which solves the technical problem that existing purification technologies cannot simultaneously achieve energy saving, good filtration effect and applicability.

[0015] The technical solution of this invention is implemented as follows:

[0016] An electro-adsorption purification system for hydraulic oil includes a waste oil storage tank, a centrifuge, a demulsification and dehydration filter assembly, a ferromagnetic filter, an electro-adsorption refining filter, a membrane system, and a purified oil storage tank.

[0017] The waste oil storage tank is connected to a centrifuge, and an oil inlet pump is installed between the waste oil storage tank and the centrifuge. The centrifuge is connected to a demulsification and dehydration filtration assembly, which is connected to a ferromagnetic filter. The ferromagnetic filter is connected to an electro-adsorption refining filtration assembly, which is connected to a membrane system. The membrane system is connected to several purified oil storage tanks.

[0018] The membrane system is connected in parallel with a circulation pipeline, on which a circulation pump and a backwash tank are installed.

[0019] The ferromagnetic filter uses high-strength neodymium magnets, which can work continuously and can adsorb 100% of the submicron-sized ferromagnetic particles generated by the wear of hydraulic components in one go, reducing the contamination of hydraulic oil, with a large processing flow and obvious adsorption effect; at the same time, it effectively reduces the load on downstream processing processes.

[0020] In a preferred embodiment, the demulsification and dehydration filtration assembly includes several demulsification and dehydration filtration units connected in parallel.

[0021] In a preferred embodiment, the electro-adsorption refining filtration assembly includes a plurality of electro-adsorption refining filters connected in parallel.

[0022] The electro-adsorption refining filter adopts a parallel arrangement and has a built-in electro-adsorption filter element with a high dirt holding capacity. The working voltage is 1.0-2.0KV. It uses a three-dimensional electrostatic field to adsorb, capture, and remove highly polar charged substances such as organic acids, alkaline nitrogen, bound water, colloids, and asphaltenes in hydraulic oil, thereby reducing the acid value of hydraulic oil and removing oxides.

[0023] Meanwhile, after the system is powered off, the polar substances adsorbed by the filter element can fall off on their own, thereby regenerating the filter element and greatly reducing the generation of consumables.

[0024] In a preferred embodiment, an online moisture detection device is provided between the demulsification and dehydration filtration assembly and the ferromagnetic filter. The online moisture detection device is located at the end of the demulsification and dehydration filter, and a polymer water-absorbing filter element is provided inside the demulsification filter.

[0025] The demulsification and dehydration filter is equipped with an online moisture detection device W at the end. The filter contains three parallel high-polymer water-absorbing filter elements specifically designed for hydraulic oil, increasing throughput. It effectively removes free water, bound water, and emulsified water from hydraulic oil, achieving a single-pass dehydration precision of below 300 ppm. It also exhibits excellent demulsification and water absorption / retention properties. Demulsification and dehydration of emulsified hydraulic oil can be performed at room temperature without additional heating, resulting in high processing efficiency, low energy consumption, and reduced oxidation of the hydraulic oil caused by continuous heating.

[0026] In a preferred embodiment, the centrifuge is a three-phase separation high-speed tubular centrifuge.

[0027] The centrifuge is a high-speed tubular centrifuge with three-phase separation, featuring a large drum contaminant capacity and a long single-cycle operation. To facilitate the cleaning of solid impurities and improve production efficiency, the drum lining is made of fiber cloth. When the drum contaminant capacity reaches a certain threshold, it can be quickly disassembled for cleaning. Furthermore, the fiber cloth lining can be reused after cleaning, which avoids secondary pollution and reduces the use of consumables.

[0028] In a preferred embodiment, the membrane system consists of three inorganic ceramic membrane filters arranged in parallel.

[0029] The membrane system employs three parallel inorganic ceramic membrane filters. A flow sensor Q and an online cleanliness detector S are installed at the downstream end of the filtration system for real-time monitoring of relevant indicators. Each ceramic membrane filter contains 20-100 inorganic ceramic membranes of 20nm-100nm thickness, exhibiting excellent mechanical stability, thermal stability, and chemical stability under extreme acid and alkaline environments, as well as good anti-fouling performance and high membrane flux. It provides high filtration precision for hydraulic oil, achieving a cleanliness level of NAS6 in a single filtration. It has a large dirt-holding capacity and can be regenerated through backwashing with compressed air or cleaning oil, resulting in a long service life.

[0030] In a preferred embodiment, the output end of the membrane system is equipped with a flow sensor and an online cleanliness detector for detecting flow rate and cleanliness.

[0031] In a preferred embodiment, a pressure sensor is provided between the centrifuge and the demulsification and dehydration filtration assembly, and a pressure sensor is provided at both the front and rear ends of the electroadsorption refining filtration assembly.

[0032] In a preferred embodiment, a control system is included, which regulates and controls the various components. The control system may be a control host or control box, etc., electrically or communicatively connected to the various electrical control devices to perform control.

[0033] The beneficial effects of this invention are:

[0034] This invention employs a series of pre-defined process technologies: centrifuge pre-filtration → demulsification and dehydration filter dehydration → ferromagnetic filter removal of ferromagnetic particles → electro-adsorption refining → ceramic membrane filtration purification. This approach effectively adsorbs, filters, and removes fluidic organic polar impurities and non-polar particulate impurities from waste hydraulic oil, significantly improving oil quality indicators, enhancing adsorption efficiency, and providing excellent filtration performance.

[0035] The filter cartridge does not need to be replaced frequently, resulting in fewer consumables, energy saving, and cost savings.

[0036] It has good applicability and can also be used to treat hydraulic oils with a water content greater than 0.05%;

[0037] It is not prone to clogging even for hydraulic oils with high solid contaminant content, has high filtration accuracy, can remove emulsified water with high water removal rate, and has good filtration effect.

[0038] In summary, this invention has the advantages of energy saving, good filtration effect and strong applicability, and solves the technical problem that existing purification technologies cannot take into account energy saving, good filtration effect and applicability.

[0039] Furthermore, the entire process of this invention is carried out at room temperature, without any additional heating, thus preventing secondary oxidation of the hydraulic oil. It also features low energy consumption and no secondary pollution. By using a membrane system instead of traditional glass fiber filters, the system consumes fewer materials, produces no secondary pollution, and consumes less energy. The purified hydraulic oil meets the relevant physicochemical properties standards for industrial hydraulic oil operation, demonstrating its value in carbon reduction, energy saving, and pollution reduction projects. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a schematic diagram of an embodiment of the present invention.

[0042] In the diagram, 1. Waste oil storage tank; 2. Oil inlet pump; 3. Centrifuge; 4. Demulsification and dehydration filter assembly; 5. Ferromagnetic filter; 6. Electroadsorption refining filter assembly; 7. Membrane system; 8. Backwash tank; 9. Circulation pump; 10. Purified oil storage tank; 11. Demulsification and dehydration filter; 12. Electroadsorption refining filter; 13. Inorganic ceramic membrane filter. Detailed Implementation

[0043] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0044] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0045] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0046] In the description of the embodiments, unless otherwise explicitly specified and limited, the terms "set," "connect," etc., should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or a connection through an intermediate medium, or it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0047] See Figure 1 An electro-adsorption purification system for hydraulic oil includes a waste oil storage tank 1, a centrifuge 3, a demulsification and dehydration filter assembly 4, a ferromagnetic filter 5, an electro-adsorption refining filter 12, a membrane system 7, and a purified oil storage tank 10.

[0048] Waste oil storage tank 1 is connected to centrifuge 3. An oil inlet pump 2 is installed between waste oil storage tank 1 and centrifuge 3. Centrifuge 3 is connected to demulsification and dehydration filter assembly 4. Demulsification and dehydration filter assembly 4 is connected to ferromagnetic filter 5. Ferromagnetic filter 5 is connected to electroadsorption refining filter assembly 6. Electroadsorption refining filter assembly 6 is connected to membrane system 7. Membrane system 7 is connected to several purified oil storage tanks 10.

[0049] The membrane system 7 is connected in parallel with a circulation pipeline, on which a circulation pump 9 and a backwash tank 8 are installed.

[0050] The arrows in the diagram indicate the flow direction, which helps to determine and understand the inlet and outlet of each component. P, Q, S, and W in the diagram represent the pressure sensor, flow sensor, online cleanliness detector, and online moisture detection device, respectively.

[0051] The ferromagnetic filter 5 uses high-strength neodymium magnets, can work continuously, and can adsorb 100% of submicron-sized ferromagnetic particles generated by the wear of hydraulic components in one go, reducing the contamination of hydraulic oil, with a large processing flow and obvious adsorption effect; at the same time, it effectively reduces the load on downstream processing processes.

[0052] The demulsification and dehydration filter assembly 4 includes several demulsification and dehydration filter units connected in parallel.

[0053] The electro-adsorption refining filter assembly 6 includes several electro-adsorption refining filters 12 connected in parallel.

[0054] The electro-adsorption refining filter 12 adopts a parallel arrangement and has a built-in electro-adsorption filter element with a high dirt holding capacity. The working voltage is 1.0-2.0KV. It uses a three-dimensional electrostatic field to adsorb, capture, and remove highly polar charged substances such as organic acids, alkaline nitrogen, bound water, colloids, and asphaltenes in hydraulic oil, thereby reducing the acid value of hydraulic oil and removing oxides.

[0055] Meanwhile, after the system is powered off, the polar substances adsorbed by the filter element can fall off on their own, thereby regenerating the filter element and greatly reducing the generation of consumables.

[0056] An online moisture detection device is installed between the demulsification and dehydration filter assembly 4 and the ferromagnetic filter 5. The online moisture detection device is located at the end of the demulsification and dehydration filter 11, and a polymer water-absorbing filter element is installed inside the demulsification filter.

[0057] The demulsifier / dehydrator filter 11 is equipped with an online moisture detection device W at its end. The filter incorporates a high-polymer water-absorbing filter element specifically designed for hydraulic oil, using a three-in-one parallel arrangement to increase throughput. It effectively removes free water, bound water, and emulsified water from hydraulic oil, achieving a single-pass dehydration precision of below 300 ppm. It also exhibits excellent demulsification and water absorption / retention properties. It can perform demulsification and dehydration of emulsified hydraulic oil at room temperature without additional heating, resulting in high processing efficiency, low energy consumption, and reduced oxidation of the hydraulic oil caused by continuous heating.

[0058] Centrifuge 3 is a three-phase separation high-speed tubular centrifuge.

[0059] Centrifuge 3 is a high-speed tubular centrifuge with three-phase separation, featuring a large drum contaminant capacity and a long single-cycle operation. To facilitate the cleaning of solid impurities and improve production efficiency, the drum lining is made of fiber cloth. When the drum contaminant capacity reaches a certain threshold, it can be quickly disassembled for cleaning. Furthermore, the fiber cloth lining can be reused after cleaning, which avoids secondary pollution and reduces the use of consumables.

[0060] The membrane system 7 consists of three parallel inorganic ceramic membrane filters 13.

[0061] The membrane system 7 employs three parallel inorganic ceramic membrane filters 13. A flow sensor Q and an online cleanliness detector S are installed at the downstream end of the filtration system to monitor relevant indicators in real time. Each ceramic membrane filter contains 20-100 inorganic ceramic membranes of 20nm-100nm thickness, exhibiting excellent mechanical stability, thermal stability, and chemical stability under extreme acid and alkaline environments, as well as good anti-fouling performance and high membrane flux. It provides high filtration accuracy for hydraulic oil, achieving a cleanliness level of NAS6 in a single filtration. It has a large dirt-holding capacity and can be regenerated through backwashing with compressed air or cleaning oil, resulting in a long service life.

[0062] The output of membrane system 7 is equipped with a flow sensor and an online cleanliness detector. These are used to detect flow rate and cleanliness.

[0063] A pressure sensor is installed between the centrifuge 3 and the demulsification and dehydration filter assembly 4, and a pressure sensor is installed at both the front and rear ends of the electroadsorption refining filter assembly 6.

[0064] This includes the control system, which is used to regulate and control various components. The control system can be a control host or control box, which is electrically or communicatively connected to various electrical control devices to perform control.

[0065] When the purification system is operating, data such as pressure (P), flow rate (Q), cleanliness (S), and moisture content (w) are transmitted to the control system for real-time monitoring and management to ensure the safe and stable operation of the system. The control system can use any commercially available control terminal that can achieve the desired functionality.

[0066] During system operation, waste hydraulic oil enters centrifuge 3 from waste oil storage tank 1 for pretreatment, completing preliminary dehydration and impurity removal. This achieves a removal rate of over 95% for large mechanical impurities larger than 1μm in the waste hydraulic oil, while simultaneously separating free water from the hydraulic oil, reducing pressure on subsequent purification devices. After centrifugation, the hydraulic oil passes through demulsification and dehydration filter 11, reducing the water content to below 300ppm, meeting reuse standards. After removing ferromagnetic particles generated by hydraulic component wear and other factors from the hydraulic oil through ferromagnetic filter 5, it undergoes electro-adsorption refining treatment. This utilizes a three-dimensional electrostatic field to adsorb and strip charged, highly polar substances such as organic acids, alkaline nitrogen, colloids, and asphaltenes from the hydraulic oil, effectively removing oxides and reducing the acid value of the hydraulic oil, thus preventing further oxidation and corrosion of metal components. Finally, a ceramic membrane system 7 performs end-of-pipe filtration, achieving a cleanliness level of NAS6 or even better for the filtered hydraulic oil, which is then stored in purified oil storage tank 10 for later use.

[0067] The following table lists two sets of actual test data from the forging plant.

[0068] Group 1: 46# anti-wear hydraulic oil. The comparison of the physical and chemical properties of the hydraulic oil before and after purification is shown in the table below. After purification, the hydraulic oil is transparent in appearance, and the indicators such as water content, cleanliness, and copper strip corrosion are comparable to or even better than those of the new oil.

[0069]

[0070] Test Data Table 1

[0071] Group 2: Comparison data of 46# anti-wear hydraulic oil before and after purification at the steel pipe factory.

[0072]

[0073] Test Data Table 2

[0074] The beneficial effects of this invention are:

[0075] This invention employs a series of pre-filtering steps: centrifuge 3 for pre-filtration → demulsification and dehydration filter 11 for dehydration → ferromagnetic filter 5 for removing ferromagnetic particles → electro-adsorption purification → ceramic membrane filtration.

[0076] The process technology can effectively adsorb, filter, and remove fluid organic polar impurities and non-polar particulate impurities from waste hydraulic oil, significantly improve oil quality indicators, enhance adsorption effect, and have excellent filtration effect.

[0077] The filter cartridge does not need to be replaced frequently, resulting in fewer consumables, energy saving, and cost savings.

[0078] It has good applicability and can also be used to treat hydraulic oils with a water content greater than 0.05%;

[0079] It is not prone to clogging even for hydraulic oils with high solid contaminant content, has high filtration accuracy, can remove emulsified water with high water removal rate, and has good filtration effect.

[0080] In summary, this invention has the advantages of energy saving, good filtration effect and strong applicability, and solves the technical problem that existing purification technologies cannot take into account energy saving, good filtration effect and applicability.

[0081] Furthermore, the entire process of this invention is carried out at room temperature, without any additional heating, thus preventing secondary oxidation of the hydraulic oil. It features low energy consumption and no secondary pollution. The use of a membrane system 7 instead of traditional glass fiber filters reduces material consumption, eliminates secondary pollution, and lowers energy consumption. The purified hydraulic oil meets the relevant physicochemical properties standards for industrial hydraulic oil operation, demonstrating its value in carbon reduction, energy saving, and pollution reduction projects.

[0082] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them; when the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope claimed by the present invention.

Claims

1. An electro-adsorption purification system for hydraulic oil, characterized in that, The waste oil storage tank, centrifuge, demulsification dehydration filter assembly, ferromagnetic filter, electric adsorption refining filter assembly, membrane system, and purified oil storage tank are connected in series. The waste oil storage tank is connected with the centrifuge, and an oil inlet pump is arranged between the waste oil storage tank and the centrifuge. The centrifuge is connected with the demulsification dehydration filter assembly, and the demulsification dehydration filter assembly is connected with the ferromagnetic filter.

2. The system for the purification of hydraulic oil by electro-sorption according to claim 1, characterized in that, The ferromagnetic filter is connected with the electric adsorption refining filter assembly.

3. The electro-adsorption purification system for hydraulic oil according to claim 1, characterized in that, The electric adsorption refining filter assembly is connected with the membrane system.

4. The system for purifying hydraulic oil by using electro-sorption according to claim 1, wherein The membrane system is connected with the purified oil storage tank.

5. The system of claim 1, wherein the electrically adsorbed purification system is a hydraulic fluid. The membrane system is connected with the circulating pipeline.

6. The system of claim 1, wherein the system further comprises a hydraulic oil tank, a hydraulic oil pump, a hydraulic oil filter, and a hydraulic oil filter cleaning device. The demulsification dehydration filter assembly includes demulsification dehydration filters connected in parallel.

7. The system of claim 1, wherein the electrically adsorbed purification system is a hydraulic fluid. The electric adsorption refining filter assembly includes electric adsorption refining filters connected in parallel.

8. The system of claim 1, wherein the system is a system for purifying hydraulic oil. The demulsification dehydration filter assembly is provided with a water content online detection device. The centrifuge is a high-speed tubular centrifuge for three-phase separation.

9. The system of claim 1, wherein the system is a system for purifying hydraulic oil. The membrane system includes three inorganic ceramic membrane filters arranged in parallel. The output end of the membrane system is provided with a flow sensor and an online cleanliness detector. A pressure sensor is arranged between the centrifuge and the demulsification dehydration filter assembly. A pressure sensor is arranged at the front end and the rear end of the electric adsorption refining filter assembly. The control system is used for adjusting and controlling each component.

Images