Oil liquid circulation purification system

Abstract

The utility model belongs to the technical field of waste oil recovery, and relates to an oil liquid circulation purification system which comprises an evaporation circulation tank, a feeding pump, a negative pressure evaporator, a pipeline heater, a cooler, a condensate water receiving tank, a vacuum pump and a multi-stage filter. Moisture is rapidly evaporated and discharged out of the system through the negative pressure evaporator under the vacuum condition, so that the moisture in the oil liquid is effectively removed; the multistage filter is used for deeply filtering small particles such as oxides and oil sludge in oil liquid, impurities are thoroughly removed, the purification system combining the vacuum circulation dehydration technology and the multistage filter technology can effectively remove moisture in waste lubricating oil, and the oil liquid can be recycled. Impurities such as oxides and oil sludge in the lubricating oil can be effectively adsorbed and removed, the cleanliness of the finally output lubricating oil is extremely high, and the requirement of high-end equipment for the cleanliness of the lubricating oil is completely met.

Description

Technical Field

[0001] The utility model relates to an oil liquid circulation purification system, belonging to the technical field of waste oil recovery. Background Art

[0002] In order to ensure the long-term stable operation of industrial equipment, the equipment has higher and higher requirements for the cleanliness of lubricating oil. Especially in high-end equipment fields such as high-pressure servo systems, wind power gearboxes, large compressor systems, and thermal power steam turbine systems, the cleanliness of lubricating oil is directly related to the operation efficiency and service life of the equipment.

[0003] However, during the actual use process, the lubricating oil will inevitably be invaded by various pollutants, mainly including moisture in the air, metal wear debris, oxidation condensates of lubricating oil, and sludge, etc. These pollutants will greatly reduce the cleanliness of the lubricating oil, causing serious wear on the surface of the friction pair. Especially metal debris and sludge oxides will play a catalytic role in the oxidation process of the lubricating oil. If not removed in time, it will greatly accelerate the oxidation process of the lubricating oil and shorten the service life of the lubricating oil. However, regular oil change and maintenance will greatly increase the procurement cost of new oil, increase the emissions of hazardous waste, and at the same time affect the production efficiency of the enterprise.

[0004] According to the understanding of the inventor, in recent years, with the strengthening of enterprise cost control, many enterprises have successively introduced some oil filter equipment. However, the traditional oil filter has poor water removal effect and cannot remove impurities such as oxides and oil stains, resulting in that the various indicators of the filtered lubricating oil cannot meet the requirements of long-term operation of the equipment, and long-term use will cause irreversible mechanical damage to the equipment and affect the service life of the equipment. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a new technical solution to improve or solve the technical problems existing in the above-mentioned prior art.

[0006] The technical solution provided by the present utility model is as follows: An oil circulation purification system includes an evaporation circulation tank, a feed pump, a negative pressure evaporator, a pipeline heater, a cooler, a condensate receiving tank, a vacuum pump, and a multi-stage filter. The inlet of the feed pump is connected to a feed pipeline, and the outlet of the feed pump is connected to the inlet of the negative pressure evaporator through a pumping pipeline. The pipeline heater is installed on the pumping pipeline. The outlet of the negative pressure evaporator is connected to a dehydration circulation pump. Two pipelines are branched out from the outlet of the dehydration circulation pump. One is a purified oil output pipeline, and a first on-off valve and a multi-stage filter are provided on the purified oil output pipeline. The other is connected to the inlet of the evaporation circulation tank through a dehydration circulation pipeline, and a second on-off valve is installed on the dehydration circulation pipeline. The outlet of the evaporation circulation tank is connected to the feed pipeline through a third on-off valve. The cooler, the condensate receiving tank, and the vacuum pump are sequentially connected in series on the vacuum interface pipeline of the negative pressure evaporator.

[0007] The technical solution provided by the present utility model has the following beneficial effects compared with the prior art: The present utility model heats the oil to a preset temperature through a pipeline heater, and makes the water evaporate rapidly and be discharged from the system under vacuum conditions through a negative pressure evaporator, thereby effectively removing the water in the oil; The multi-stage filter deeply filters tiny particles such as oxides and sludge in the oil to completely remove impurities. The purification system of the present utility model combines the processes of vacuum circulation dehydration and multi-stage filtration, which can not only effectively remove the water in the waste lubricating oil, but also effectively adsorb and remove impurities such as oxides and sludge in the lubricating oil. The finally output lubricating oil has extremely high cleanliness and fully meets the cleanliness requirements of high-end equipment for lubricating oil.

[0008] On the basis of the above technical solution, the present utility model can also be improved as follows.

[0009] Further, the multi-stage filter includes a mesoporous adsorption filter in the first stage and a membrane pore adsorption filter in the second stage. The mesoporous adsorption filter is connected to the outlet of the first on-off valve, the outlet of the mesoporous adsorption filter is connected to the inlet of the membrane pore adsorption filter, and the outlet of the membrane pore adsorption filter is used to output purified oil.

[0010] The beneficial effect of adopting the above further solution is that the accuracy of oil purification can be significantly improved through the combination of two-stage filtration. The first-stage mesoporous adsorption filter, as a pretreatment step, reduces the impurity load entering the second-stage membrane pore adsorption filter, protects the membrane material from damage by large particles, and extends the service life of the membrane. At the same time, the membrane pore adsorption filter can more finely filter the oil to ensure the purity of the output oil.

[0011] Further, the pipeline heater adopts an electric heater, and the heating power P ≤ 2.5W / cm 2 .

[0012] The beneficial effect of adopting the above further solution is that it ensures that the oil can be heated evenly and stably to the required temperature during the heating process, avoiding the decline in oil quality or potential safety hazards caused by local overheating.

[0013] Furthermore, the outlet of the negative pressure evaporator is connected to the dehydration circulation pump through a fourth switching valve.

[0014] The beneficial effect of adopting the above further solution is that the dehydration circulation flow can be controlled through the fourth switching valve.

[0015] Furthermore, the filter element material of the membrane pore adsorption filter is polytetrafluoroethylene.

[0016] The beneficial effect of adopting the above further solution is that polytetrafluoroethylene (PTFE), as a high-performance filtering material, has excellent chemical stability, corrosion resistance, and high-temperature resistance. This enables the membrane pore adsorption filter to operate stably for a long time in a harsh working environment and effectively resist the erosion of corrosive components such as acid-base substances and oxidants in the oil on the filter element.

[0017] Furthermore, the membrane pore adsorption filter can filter out particles with a size greater than or equal to 0.5 microns.

[0018] The beneficial effect of adopting the above further solution is that this filtering accuracy meets the strict requirements of high-end equipment for the cleanliness of lubricating oil.

[0019] Furthermore, the heating temperature range of the pipeline heater is 60°C - 75°C.

[0020] The beneficial effect of adopting the above further solution is that within this temperature range, the oil can be heated evenly, promoting the rapid evaporation of moisture in it, while avoiding the deterioration of the oil caused by excessive temperature.

[0021] Furthermore, the vacuum degree in the negative pressure evaporator is -0.09 MPa to -0.08 MPa.

[0022] The beneficial effect of adopting the above further solution is that the setting of this vacuum degree range optimizes the dehydration performance of the negative pressure evaporator. At this vacuum degree, the negative pressure evaporator can create an efficient dehydration environment, enabling the moisture in the oil to evaporate rapidly at a lower temperature, thereby reducing energy consumption and the thermal stress of the oil. Description of the Drawings

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings.

[0024] Figure 1 is a schematic structural diagram of the oil liquid circulation purification system of the present invention;

[0025] In the figure, 100 is an evaporation circulation tank; 110 is a third switching valve;

[0026] 200 is a feed pipeline; 210 is a feed pump;

[0027] 300 is a negative pressure evaporator;

[0028] 400 is a pumping pipeline; 410 is a pipeline heater;

[0029] 500 is a vacuum interface pipeline; 510 is a cooler; 520 is a condensate receiving tank; 530 is a vacuum pump; 540 is a check valve;

[0030] 600 is a purified oil output pipeline; 610 is a first switching valve; 620 is a mesoporous adsorption filter; 630 is a membrane pore adsorption filter;

[0031] 700 is a dehydration circulation pipeline; 710 is a second switching valve; 720 is a dehydration circulation pump;

[0032] 800 is a fourth switching valve. Specific embodiments

[0033] The following describes the principles and features of the present invention in combination with examples. The examples given are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0034] Such as Figure 1As shown in the figure, an oil circulation and purification system includes an evaporation circulation tank 100, a feed pump 210, a negative pressure evaporator 300, a pipeline heater 410, a cooler 510, a condensate receiving tank 520, a vacuum pump 530 and a multi-stage filter. The inlet of the feed pump 210 is connected to a feed pipeline 200, and the outlet of the feed pump 210 is connected to the inlet of the negative pressure evaporator 300 through a pumping pipeline 400. The pipeline heater 410 is installed on the pumping pipeline 400. The outlet of the negative pressure evaporator 300 is connected to a dehydration circulation pump 720. Two pipelines are branched out from the outlet of the dehydration circulation pump 720. One is a purified oil output pipeline 600, and a first switching valve 610 and a multi-stage filter are provided on the purified oil output pipeline 600. The other is connected to the inlet of the evaporation circulation tank 100 through a dehydration circulation pipeline 700. A second switching valve 710 is installed on the dehydration circulation pipeline 700. The outlet of the evaporation circulation tank 100 is connected to the feed pipeline 200 through a third switching valve 110. The cooler 510, the condensate receiving tank 520 and the vacuum pump 530 are sequentially connected in series on a vacuum interface pipeline 500 of the negative pressure evaporator 300. A one-way valve 540 is further provided on the pipeline between the vacuum pump 530 and the condensate receiving tank 520 to prevent the condensate water in the condensate receiving tank 520 from flowing into the vacuum pump 530.

[0035] In this embodiment, the cooler 510 is an air cooler. The multi-stage filter includes a mesoporous adsorption filter 620 at the first stage and a membrane pore adsorption filter 630 at the second stage. The mesoporous adsorption filter 620 is connected to the outlet of the first switching valve 610. The outlet of the mesoporous adsorption filter 620 is connected to the inlet of the membrane pore adsorption filter 630. The outlet of the membrane pore adsorption filter 630 is used to output purified oil. Through the combination of two-stage filtration, the precision of oil purification can be significantly improved. The first-stage mesoporous adsorption filter 620, as a pretreatment step, reduces the impurity load entering the second-stage membrane pore adsorption filter 630, protects the membrane material from damage by large particles, and extends the service life of the membrane. At the same time, the membrane pore adsorption filter 630 can filter the oil more finely to ensure the purity of the output oil.

[0036] The pipeline heater 410 uses an electric heater, and the heating power P ≤ 2.5W / cm 2 , and the heating temperature of the pipeline heater 410 is controlled at 60°C - 75°C. This heating temperature can ensure that the oil can be heated evenly and stably to the required temperature during the heating process, and also avoid the decline of oil quality or potential safety hazards caused by local overheating.

[0037] The outlet of the negative pressure evaporator 300 is connected to the dehydration circulation pump 720 through a fourth switching valve 800, and the dehydration circulation flow can be controlled through the fourth switching valve 800.

[0038] The filter element material of the membrane pore adsorption filter 630 is polytetrafluoroethylene. As a high-performance filtering material, polytetrafluoroethylene (PTFE) has excellent chemical stability, corrosion resistance, and high-temperature resistance. This enables the membrane pore adsorption filter 630 to operate stably for a long time in a harsh working environment and effectively resist the erosion of corrosive components such as acid-base substances and oxidants in the oil fluid on the filter element. The membrane pore adsorption filter can filter particles above 0.5μm, and this filtering accuracy meets the strict requirements of high-end equipment for the cleanliness of lubricating oil.

[0039] The working method of the oil fluid circulation purification system of the present utility model includes the following steps:

[0040] Preparation stage: Pump the oil fluid to be processed into the negative pressure evaporator 300 through the feed pump 210;

[0041] Circulating dehydration: Start the vacuum pump 530, and turn on the pipeline heater 410 to preheat the oil fluid as needed. Turn on the cooler 510 and the dehydration circulating pump 720. When the water content in the oil material is relatively high, turn on the second switching valve 710 and the third switching valve 110, and close the first switching valve 610 to realize the oil fluid circulating dehydration process;

[0042] Output stage: Until the oil fluid reaches the output standard, close the second switching valve 710, open the first switching valve 610, and the oil fluid is further filtered by the multi-stage filter and then output.

[0043] In the preparation stage, the oil fluid to be processed is accurately pumped into the negative pressure evaporator 300. After entering the circulating dehydration stage, the coordinated action of the vacuum pump 530 and the pipeline heater 410 quickly and effectively removes most of the water in the oil fluid. At the same time, the cooler 510 ensures the stable operation of the system, and the operation of the dehydration circulating pump 720 realizes the circulating flow of the oil fluid, further improving the dehydration efficiency. When the water content in the oil fluid is relatively high, by controlling the opening and closing of the second switching valve 710, it is ensured that the oil fluid undergoes circulating dehydration under the best conditions until the water content reaches the preset output index; in the output stage, with the closing of the second switching valve 710 and the opening of the first switching valve 610, the oil fluid is guided to the multi-stage filter for deep purification. This step not only removes the remaining fine particles, oxides, sludge and other impurities in the oil fluid, but also significantly improves the cleanliness and quality of the oil fluid, making it fully meet the strict requirements of high-end equipment for the cleanliness of lubricating oil.

[0044] In this embodiment, the vacuum degree in the negative pressure evaporator 300 is controlled within the range of -0.09 MPa to -0.08 MPa. The setting of this vacuum degree range optimizes the dehydration performance of the negative pressure evaporator 300. At this vacuum degree, the negative pressure evaporator 300 can create an efficient dehydration environment, enabling the water in the oil to evaporate rapidly at a lower temperature, thereby reducing energy consumption and the thermal stress of the oil.

[0045] Through links such as cyclic dehydration and multi-stage filtration, the water in the oil is effectively removed to an extremely low level. At the output stage, the output index of the oil can reach a water content ≤ 0.03%. The oil with a low water content can significantly improve the operation efficiency and stability of the equipment, reduce equipment failures and wear caused by oil contamination, thereby extending the service life of the equipment and reducing maintenance costs.

[0046] In the preparation stage, the oil to be processed is accurately pumped into the negative pressure evaporator 300. After entering the cyclic dehydration stage, the collaborative action of the vacuum pump 530 and the pipeline heater 410 quickly and effectively removes most of the water in the oil. At the same time, the cooler 510 ensures the stable operation of the system, and the operation of the dehydration circulation pump 720 realizes the cyclic flow of the oil, further improving the dehydration efficiency. When the water content in the oil is high, by controlling the opening and closing of the second switching valve 710, it is ensured that the oil undergoes cyclic dehydration under the best conditions until the water content reaches the preset output index. At the output stage, with the opening of the second switching valve 710 and the first switching valve 610, the oil is guided to the multi-stage filter for deep purification. This step not only removes impurities such as residual fine particles, oxides, and sludge in the oil, but also significantly improves the cleanliness and quality of the oil, making it fully meet the stringent requirements of high-end equipment for the cleanliness of lubricating oil. The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. An oil circulation purification system, characterized in that: The invention comprises an evaporation circulation tank (100), a feed pump (210), a negative pressure evaporator (300), a pipeline heater (410), a cooler (510), a condensed water receiving tank (520), a vacuum pump (530) and a multi-stage filter, wherein the inlet of the feed pump (210) is connected to the feed pipeline (200), the outlet of the feed pump (210) is connected to the inlet of the negative pressure evaporator (300) through a pumping pipeline (400), the pipeline heater (410) is installed on the pumping pipeline (400), the outlet of the negative pressure evaporator (300) is connected to a dehydration circulation pump (720), and a dehydration circulation pump (720) is separated from the outlet of the dehydration circulation pump (720). Two pipelines, one is a purified oil output pipeline (600), the purified oil output pipeline (600) is provided with a first switch valve (610) and a multi-stage filter, and the other is connected to the inlet of the evaporation circulation tank (100) through a dehydration circulation pipeline (700), the second switch valve (710) is installed on the dehydration circulation pipeline (700), the outlet of the evaporation circulation tank (100) is connected to the feed pipeline (200) through a third switch valve (110), and the cooler (510), the condensed water receiving tank (520) and the vacuum pump (530) are connected in series in sequence on the vacuum interface pipeline (500) of the negative pressure evaporator (300).

2. The oil circulation purification system according to claim 1, characterized in that: The multi-stage filter comprises a first-stage mesoporous adsorption filter (620) and a second-stage membrane pore adsorption filter (630), wherein the mesoporous adsorption filter (620) is connected to the outlet of the first switch valve (610), the outlet of the mesoporous adsorption filter (620) is connected to the inlet of the membrane pore adsorption filter (630), and the outlet of the membrane pore adsorption filter (630) is used to output purified oil.

3. The oil circulation purification system according to claim 2, characterized in that: The pipeline heater (410) is an electric heater with a heating power P≤2.5W / cm2.

4. The oil circulation purification system according to any one of claims 1 to 3, characterized in that: The outlet of the negative pressure evaporator (300) is connected to the dehydration circulation pump (720) via a fourth switch valve (800).

5. The oil circulation purification system according to claim 2 or 3, characterized in that: The filter element of the membrane pore adsorption filter (630) is made of polytetrafluoroethylene.

6. The oil circulation purification system according to claim 2 or 3, characterized in that: The membrane pore adsorption filter (630) is capable of filtering out particles with a size greater than or equal to 0.5 microns.

7. The oil circulation purification system according to claim 3, characterized in that: The heating temperature of the pipeline heater (410) ranges from 60°C to 75°C.

8. The oil circulation purification system according to claim 1, characterized in that: The vacuum degree in the negative pressure evaporator (300) is -0.09 MPa to -0.08 MPa.

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