Waste oil liquid purification treatment system

Abstract

The utility model belongs to the technical field of waste oil recovery, and relates to a waste oil liquid purification treatment system which forms a closed-loop centrifugal circulation path by integrating equipment such as a heater, a negative pressure evaporator, a centrifugal machine and a vacuum pump, waste oil liquid is firstly fed into a centrifugal circulation tank and is heated by the heater, and the waste oil liquid is discharged from the centrifugal circulation tank. The heated oil liquid enters the negative pressure evaporator, low-boiling-point impurities are rapidly evaporated under the negative pressure environment generated by the vacuum pump, primary separation of the oil liquid and the impurities is achieved, the evaporated gas part is subjected to condensation recycling treatment, the purified oil liquid enters the centrifugal machine to be further refined and separated, and the oil liquid is recycled. And finally returning to the centrifugal circulating tank. According to the waste oil liquid purification device, harmful substances in waste oil liquid can be effectively removed in the purification process, and the waste oil liquid can be efficiently and continuously treated and purified and reutilized by optimizing the heating and evaporation process and reasonable energy recovery and utilization design.

Description

Technical Field

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

[0002] Lubricating oil, as the core lubricant of industrial equipment, its performance directly affects the operation efficiency and service life of the equipment, and is an essential key element in industrial production. However, as the use time of lubricating oil extends, various pollutants will gradually accumulate inside it, such as mechanical impurities, carbon black, rubber particles, etc. These pollutants will significantly reduce the lubricating performance of the lubricating oil, and ultimately lead to its inability to meet the requirements for continued use and can only be discarded.

[0003] Especially in the internal mixer of rubber tire production enterprises, due to the special working environment and structural characteristics of this equipment, the sealing ring lubricating oil is extremely vulnerable to pollution by substances such as carbon black, additives, and rubber. These pollutants will not only cause the impurity content in the lubricating oil to seriously exceed the standard, affecting the recycling of the lubricating oil, but also increase the environmental protection burden and production cost of the enterprise. Currently, for this highly polluted lubricating oil, the commonly adopted recovery and treatment methods by enterprises include sedimentation separation and filtration, etc.

[0004] However, the traditional sedimentation separation method has problems such as long centrifugal separation time and low separation efficiency. The treated lubricating oil still contains a large amount of particulate impurities, which cannot meet the requirements of the equipment for the cleanliness of the lubricating oil, and further exacerbates the wear of the equipment friction pair and shortens the service life of the equipment. While the filtration method can remove some particulate matter, limited by the dirt holding capacity of the filter element, it is extremely easy to become blocked when treating highly polluted lubricating oil, and the filter element needs to be frequently replaced, increasing the treatment cost and operation difficulty.

[0005] Therefore, a waste oil purification treatment system and treatment method that can efficiently and low-costly purify highly polluted lubricating oil are needed, which is of great significance for reducing the production cost of industrial enterprises, improving the operation efficiency of equipment, and reducing environmental protection pressure.

[0006] It should be noted that the above information disclosed in this background art section is only used to understand the background art of the inventive concept of the utility model, and therefore, it may include information that does not constitute the prior art. Summary of the Utility Model

[0007] The purpose of the utility model is to provide a waste oil purification treatment system to improve or solve the technical problems existing in the prior art as described above.

[0008] The technical solution provided by the present utility model is as follows: A waste oil purification and treatment system includes a centrifugal circulation tank, and further includes a centrifugal circulation path starting and ending at the centrifugal circulation tank. A heater, a negative pressure evaporator, a centrifuge, and a vacuum pump are provided on the centrifugal circulation path. The inlet of the heater is connected to the outlet of the centrifugal circulation tank, the outlet of the heater is connected to the inlet of the negative pressure evaporator, the outlet of the negative pressure evaporator is branched into two paths. One path returns to the centrifugal circulation tank through a pipeline provided with a heating circulation valve, and the other path is connected to the inlet of the centrifuge through a pipeline controlled by a centrifugal circulation valve. The outlet of the centrifuge returns to the centrifugal circulation tank; the vacuum pump is connected to the vacuum interface of the negative pressure evaporator, and the vacuum pump is used to generate negative pressure to suck the oil liquid in the centrifugal circulation tank into the negative pressure evaporator.

[0009] The technical solution provided by the present utility model has the following beneficial effects compared with the prior art: The waste oil purification and treatment system of the present utility model forms a closed-loop centrifugal circulation path by integrating devices such as a heater, a negative pressure evaporator, a centrifuge, and a vacuum pump. The waste oil liquid is first sent into the centrifugal circulation tank and heated by the heater to improve the evaporation efficiency of each component in the waste oil liquid. The heated oil liquid enters the negative pressure evaporator. Under the negative pressure environment generated by the vacuum pump, low-boiling impurities quickly evaporate, realizing the preliminary separation of the oil liquid and impurities. Part of the evaporated gas is treated by condensation and recovery, while the purified oil liquid enters the centrifuge for further refined separation and finally returns to the centrifugal circulation tank. The present utility model can effectively remove harmful substances in the waste oil liquid during the purification process, reduce the pollution to the environment caused by directly discharging the waste oil liquid, and can efficiently and continuously treat the waste oil liquid through optimizing the heating and evaporation processes, as well as reasonable energy recovery and utilization design, realizing its purification and reuse.

[0010] Based on the above technical solution, the present utility model can also be improved as follows.

[0011] Furthermore, it further includes a purified oil output path. A first pressure pump and a fine filter are provided on the purified oil output path. The inlet of the first pressure pump is connected to the outlet of the centrifugal circulation tank, the outlet of the first pressure pump is connected to the fine filter, the outlet of the fine filter is branched into two paths. One path is a filter circulation pipeline returning to the centrifugal circulation tank, and the other path is a pipeline for outputting the purified oil liquid. A filter circulation valve is provided on the filter circulation pipeline, and an oil outlet valve is provided on the pipeline for outputting the purified oil liquid.

[0012] The beneficial effects of adopting the above further solution are as follows: By purifying the oil output path, the oil purified through the centrifugal circulation path can be further processed by the first pressure pump and the fine filter, effectively removing impurities such as fine particles and suspended matter in the oil, improving the cleanliness and purity of the oil, meeting the requirements of higher standards for reuse. Moreover, by controlling the opening and closing of the filter circulation valve and the oil outlet valve, it is possible to flexibly choose to return the purified oil to the centrifugal circulation tank for recirculation treatment or directly output it as finished purified oil. Adopting a purification method that combines centrifugal separation and precision filtration can effectively reduce the replacement frequency of consumables such as filter elements and reduce the purification cost, which is particularly suitable for the purification process of highly contaminated lubricating oils such as the sealing ring lubricating oil of internal mixers.

[0013] Further, a plurality of the fine filters are arranged in parallel on the purified oil output path.

[0014] The beneficial effects of adopting the above further solution are as follows: Arranging a plurality of fine filters in parallel on the purified oil output path can achieve parallel filtration treatment of the oil, significantly shortening the time for the oil to pass through the fine filter and improving the filtration efficiency. At the same time, the plurality of fine filters can share the filtration load, extend the service life of a single fine filter, and reduce the replacement frequency and cost.

[0015] Further, a first temperature sensor and / or a first liquid level sensor are / is further provided on the centrifugal circulation tank, and a second temperature sensor and / or a flow sensor are / is further provided on the pipeline connecting the outlet of the heater and the negative pressure evaporator.

[0016] The beneficial effects of adopting the above further solution are as follows: Adding a first temperature sensor and / or a first liquid level sensor on the centrifugal circulation tank can real-time monitor the temperature and liquid level of the oil in the tank, ensuring that the oil is heated and evaporated within an appropriate temperature range. Adding a second temperature sensor and / or a flow sensor on the pipeline connecting the outlet of the heater and the negative pressure evaporator can further monitor the temperature and flow of the oil before entering the negative pressure evaporator, which helps to adjust the heating power of the heater and the opening of the liquid level control valve, ensuring that the oil enters the negative pressure evaporator for evaporation treatment in the best state. The liquid level control valve is arranged in the negative pressure evaporator.

[0017] Further, an oil inlet valve and / or a coarse filter are / is provided on the pipeline connecting the inlet of the heater and the outlet of the centrifugal circulation tank.

[0018] The beneficial effects of adopting the above further scheme are as follows. An oil inlet valve is added to the pipeline connecting the inlet of the heater and the outlet of the centrifugal circulation tank, which can achieve precise control of the oil flow. When it is necessary to stop heating or perform maintenance, the oil inlet valve can be quickly closed to cut off the path of the oil flowing to the heater. The coarse filter can perform preliminary filtration on the oil before it enters the heater. The coarse filter can remove large particle impurities and solid suspended matters in the oil, reduce the burden on subsequent treatment equipment, and improve the overall purification effect. At the same time, this also helps to protect the heater from impurity blockage and wear.

[0019] Further, a stirring device is provided inside the centrifugal circulation tank, and the stirring device is used to stir the oil in the centrifugal circulation tank.

[0020] The beneficial effects of adopting the above further scheme are to prevent impurities from depositing at the bottom of the centrifugal circulation tank and affecting the discharge.

[0021] Further, a second pressure pump and a first one-way valve are successively provided at the outlet of the negative pressure evaporator. The second pressure pump is used to pressurize and output the oil processed in the negative pressure evaporator, and the first one-way valve is used to prevent the oil from flowing back.

[0022] Further, a cooler and a cooling buffer tank are successively connected in series to the pipeline connecting the vacuum pump and the vacuum interface of the negative pressure evaporator. A second one-way valve is also provided between the cooling buffer tank and the vacuum pump. A drain pipe is also connected to the cooler, and a water accumulation tank is connected to the drain pipe. A drain valve is provided at the water outlet of the water accumulation tank.

[0023] The beneficial effects of adopting the above further scheme are that part of the evaporated gas is condensed by the cooler and recovered into the water accumulation tank. The cooling buffer tank can not only further reduce the gas temperature, but also play a role in buffering and stabilizing the air flow. It can slow down the gas flow speed to a certain extent and prevent the vacuum pump from being impacted due to excessive air flow fluctuations.

[0024] Further, a residual oil tank is provided inside the centrifuge. The residual oil in the centrifuge is discharged into the residual oil tank, and the residual oil in the residual oil tank returns to the centrifugal circulation tank through a residual oil pipeline, and an emptying oil pump is provided on the residual oil pipeline.

[0025] The beneficial effects of adopting the above further scheme are as follows. If the residual oil is directly discharged, it will not only cause waste of resources, but also may pollute the environment. By setting a residual oil tank inside the centrifuge, the residual oil generated during the centrifugation process can be collected. By connecting the residual oil tank to the centrifugal circulation tank and returning the residual oil to the centrifugal circulation tank through the residual oil pipeline, the reuse of the residual oil can be achieved. By setting an emptying oil pump on the residual oil pipeline, the automatic collection and transportation of the residual oil can be realized.

[0026] Furthermore, a plurality of valves are provided on both the purified oil output path and the centrifugal circulation path to control the circulation path of the oil fluid through the plurality of valves.

[0027] The beneficial effect of adopting the above further solution is that the setting of a plurality of valves enables the system to flexibly adjust the circulation path of the oil fluid according to different processing requirements.

[0028] Furthermore, the vacuum degree in the negative pressure evaporator is -0.09 MPa to -0.08 MPa.

[0029] The beneficial effect of adopting the above further solution is that within the above vacuum degree range, the negative pressure evaporator can form an ideal negative pressure environment, which is beneficial to the rapid evaporation of water in the waste oil fluid and ensures the stability of the treatment process.

[0030] Furthermore, the heating temperature of the heater is set to 50°C to 80°C. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order 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 for use 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, other drawings can be obtained according to the provided drawings without creative efforts.

[0032] Figure 1 It is a schematic structural diagram of the waste oil fluid purification treatment system of the present invention;

[0033] In the figure, 100, centrifugal circulation tank; 110, first temperature sensor; 120, first liquid level sensor; 130, stirring device; 200, centrifugal circulation path; 210, heater; 211, oil inlet valve; 212, coarse filter; 220, negative pressure evaporator; 221, liquid level control valve; 230, centrifuge; 231, residual oil pipeline; 232, evacuation oil pump; 240, vacuum pump; 241, cooler; 2411, water accumulation tank; 2412, drain valve; 2413, second liquid level sensor; 242, cooling buffer tank; 243, second one-way valve; 250, second pressure pump; 260, first one-way valve; 270, second temperature sensor; 280, flow sensor; 291, heating circulation valve; 292, centrifugal circulation valve; 300, purified oil output path; 310, first pressure pump; 320, fine filter; 330, filtration circulation valve; 340, oil outlet valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] The principles and features of the present utility model will be described below in conjunction with examples. The examples are only used to explain the present utility model and are not intended to limit the scope of the present utility model.

[0035] As Figure 1 shown, a waste oil purification treatment system includes a centrifugal circulation tank 100, and further includes a centrifugal circulation path 200 that starts and ends at the centrifugal circulation tank 100. A heater 210, a negative pressure evaporator 220, a centrifuge 230, and a vacuum pump 240 are provided on the centrifugal circulation path 200. The inlet of the heater 210 is connected to the outlet of the centrifugal circulation tank 100, the outlet of the heater 210 is connected to the inlet of the negative pressure evaporator 220. The outlet of the negative pressure evaporator 220 branches into two paths. One path returns to the centrifugal circulation tank 100 through a pipeline, and a heating circulation valve 291 is provided on the pipeline returning to the centrifugal circulation tank 100. The other path is connected to the inlet of the centrifuge 230, and a centrifugal circulation valve 292 is provided on the pipeline connected to the inlet of the centrifuge 230. The outlet of the centrifuge 230 returns to the centrifugal circulation tank 100. The vacuum pump 240 is connected to the vacuum interface of the negative pressure evaporator 220, and the vacuum pump 240 is used to generate negative pressure to suck the oil liquid in the centrifugal circulation tank 100 into the negative pressure evaporator 220.

[0036] The waste oil purification treatment system further includes a purified oil output path 300. The outlet of the centrifugal circulation tank 100 branches into two paths. One path is connected to the centrifugal circulation path 200, and the other path is connected to the purified oil output path 300. A first pressure pump 310 and a fine filter 320 are provided on the purified oil output path 300. The inlet of the first pressure pump 310 is connected to the outlet of the centrifugal circulation tank 100, the outlet of the first pressure pump 310 is connected to the fine filter 320. The outlet of the fine filter 320 branches into two paths. One path is a filter circulation pipeline that returns to the centrifugal circulation tank 100, and the other path is a purified oil output pipeline for outputting the purified oil liquid. A filter circulation valve 330 is provided on the filter circulation pipeline, and an oil outlet valve 340 is provided on the purified oil output pipeline.

[0037] A plurality of the fine filters 320 are provided in parallel on the purified oil output path 300, which can realize parallel filtration treatment of the oil liquid, can significantly shorten the time for the oil liquid to pass through the fine filter 320, and improve the filtration efficiency. At the same time, the plurality of fine filters 320 can share the filtration load, extend the service life of a single fine filter 320, and reduce the replacement frequency and cost.

[0038] Adding a first temperature sensor 110 and / or a first liquid level sensor 120 to the centrifugal circulation tank 100 can monitor the temperature and liquid level of the oil in the tank in real time, ensuring that the oil is heated and evaporated within an appropriate temperature range; adding a second temperature sensor 270 and a flow sensor 280 to the pipeline connecting the outlet of the heater 210 and the negative pressure evaporator 220 can further monitor the temperature and flow of the oil before entering the negative pressure evaporator 220, which helps to adjust the heating power of the heater 210 and the opening degree of the liquid level control valve 221, ensuring that the oil enters the negative pressure evaporator 220 for evaporation treatment in the best state. The liquid level control valve 221 is arranged inside the negative pressure evaporator 220.

[0039] An oil inlet valve 211 and a coarse filter 212 are provided on the pipeline connecting the inlet of the heater 210 and the outlet of the centrifugal circulation tank 100. The oil inlet valve 211 can achieve precise control of the oil flow. When it is necessary to stop heating or perform maintenance, the oil inlet valve 211 can be quickly closed to cut off the path of the oil flowing to the heater 210. The coarse filter 212 can perform preliminary filtration on the oil before it enters the heater 210. The coarse filter 212 can remove large particle impurities and solid suspended matters in the oil, reducing the burden on subsequent processing equipment and improving the overall purification effect. At the same time, this also helps to protect the heater 210 from impurity blockage and wear.

[0040] A stirring device 130 is arranged inside the centrifugal circulation tank 100. The stirring device 130 is used to stir the oil in the centrifugal circulation tank 100 to prevent impurities from depositing at the bottom of the centrifugal circulation tank 100 and affecting the discharging.

[0041] A second pressure pump 250 and a first one-way valve 260 are successively arranged at the outlet of the negative pressure evaporator 220. The second pressure pump 250 is used to pressurize and output the processed oil in the negative pressure evaporator 220, and the first one-way valve 260 is used to prevent the oil from flowing back.

[0042] A cooler 241 and a cooling buffer tank 242 are successively connected in series on the pipeline connecting the vacuum pump 240 and the vacuum interface of the negative pressure evaporator 220. A second one-way valve 243 is also arranged between the cooling buffer tank 242 and the vacuum pump 240. A drain pipe is connected to the cooler 241, and a water accumulation tank 2411 is connected to the drain pipe. A drain valve 2412 is arranged at the water outlet of the water accumulation tank 2411, and a second liquid level sensor 2413 is also arranged inside the water accumulation tank 2411. The evaporated gas part is condensed and recovered into the water accumulation tank 2411 through the cooler 241. The cooling buffer tank 242 can not only further reduce the gas temperature, but also play a role in buffering and stabilizing the gas flow. It can slow down the gas flow speed to a certain extent and prevent the vacuum pump 240 from being impacted due to excessive gas flow fluctuations.

[0043] The centrifuge 230 is provided with a waste oil tank. The residual oil in the centrifuge 230 is discharged into the waste oil tank, and the residual oil in the waste oil tank returns to the centrifugal circulation tank 100 through a waste oil pipeline 231. An emptying oil pump 232 is provided on the waste oil pipeline 231. If the residual oil is directly discharged, it will not only cause waste of resources but also may pollute the environment. By setting a waste oil tank in the centrifuge 230, the residual oil generated during the centrifugation process can be collected. By connecting the waste oil tank to the centrifugal circulation tank 100 and returning the residual oil to the centrifugal circulation tank 100 through the waste oil pipeline 231, the reuse of the residual oil can be realized. By setting the emptying oil pump 232 on the waste oil pipeline 231, the automatic collection and transportation of the residual oil can be realized.

[0044] A plurality of valves are provided on both the purified oil output path 300 and the centrifugal circulation path 200 to control the circulation path of the oil fluid through the plurality of valves. The setting of the plurality of valves enables the system to flexibly adjust the circulation path of the oil fluid according to different processing requirements.

[0045] The method for purifying waste oil fluid by using the waste oil fluid purification treatment system of the present utility model is as follows:

[0046] Preparation stage: Pour the waste oil fluid to be treated into the centrifugal circulation tank 100. A filter screen is provided at the oil inlet of the centrifugal circulation tank 100 for initially filtering large particle impurities in the waste oil fluid. For example, the waste lubricating oil collected in a 200L standard barrel is poured from the barrel mouth of the oil pouring vehicle into the centrifugal circulation tank 100. A stainless steel wire mesh with a mesh size of 30 - 60 meshes is laid on the upper part of the oil injection port of the centrifugal circulation tank 100 for rough filtering, mainly filtering larger particle debris to prevent clogging of equipment pipelines and pumps. The centrifugal circulation tank 100 is provided with a stirring device 130. During the oil filling process, the stirring device 130 is turned on to stir the oil to prevent impurities from depositing at the bottom of the tank and affecting the discharge.

[0047] Heating cycle: When the oil in the centrifugal circulation tank 100 reaches the preset liquid level, start the vacuum pump 240, so that the oil in the centrifugal circulation tank 100 is sucked into the negative pressure evaporator 220 under the action of negative pressure. Open the second pressure pump 250 and the heating cycle valve 291, close the centrifugal circulation valve 292, and start the heater 210 as needed to preheat the oil entering the negative pressure evaporator 220 to improve the evaporation efficiency. The preheated oil is pumped back into the centrifugal circulation tank 100 to achieve circulating heating. In this embodiment, the negative pressure evaporator 220 adopts a packing design and is internally equipped with packing beds such as Raschig rings and Pall rings to increase the evaporation area of the material. The vacuum degree in the negative pressure evaporator 220 is controlled between -0.09 MPa and -0.08 MPa, and the heating temperature is set at 50°C - 80°C. The oil in the negative pressure evaporator 220 is pumped back into the centrifugal circulation tank 100 by the second pressure pump 250 to achieve circulating heating.

[0048] Centrifugal separation: When the oil temperature (the oil temperature measured by the second temperature sensor 270) reaches the set temperature, for example, 60°C, start the centrifuge 230 and close the heating cycle valve 291. When the centrifuge 230 reaches the set speed of 3500 r / min - 4000 r / min, open the centrifugal circulation valve 292. The oil in the negative pressure evaporator 220 is pressurized by the second pressure pump 250 and then sent into the centrifuge 230. The centrifuge 230 uses the centrifugal force generated by high-speed rotation to separate impurities such as solid particles and residual moisture in the oil to obtain purer oil. While performing circulating negative pressure dehydration on the oil, centrifugal separation is carried out until the moisture content in the oil ≤ 0.03%. The evaporated water vapor is condensed by the cooler 241 and received in the water accumulation tank 2411 and discharged regularly. The centrifugal separation time can be arbitrarily set according to the solid impurity content in the oil. When the centrifuge 230 runs to the preset time, it stops.

[0049] Purification and output: Close the vacuum pump 240. When the liquid level in the negative pressure evaporator 220 reaches the low liquid level, close the second pressure pump 250 and the centrifuge 230, open the first pressure pump 310, the fine filter 320 and the oil outlet valve 340, and at the same time close the filtration circulation valve 330. The purified oil is output through the purified oil output pipeline. If the purity of the oil does not meet the preset requirements, close the oil outlet valve 340 and open the filtration circulation valve 330. The oil is filtered again by the fine filter 320 and then returned to the centrifugal circulation tank 100 for repeated treatment until the purity of the oil meets the standard.

[0050] The waste oil purification method combines multiple processing units such as a centrifugal circulation tank 100, a negative pressure evaporator 220, a centrifuge 230, and a fine filter 320 to achieve multi-stage purification and in-depth treatment of waste oil. Through steps such as preliminary filtration, negative pressure evaporation, centrifugal separation, and fine filtration, impurities and pollutants in the waste oil can be efficiently removed, improving the quality of the purified oil.

[0051] The vacuum degree in the negative pressure evaporator 220 is controlled within the range of -0.09 MPa to -0.08 MPa. Within this vacuum degree range, it can not only ensure that the negative pressure evaporator 220 can form an ideal negative pressure environment but also ensure that the feed flow rate of the negative pressure evaporator 220 is within a reasonable range, which is conducive to the rapid evaporation of water in the waste oil and ensures the stability of the treatment process. The heating temperature of the heater 210 is set at 50°C to 80°C. This temperature range not only ensures the separation effect but also avoids the situation of accelerated oxidation rate of the oil caused by too high temperature, which may lead to changes in the properties of the oil. The rotation speed of the centrifuge 230 is controlled within the range of 3500 r / min - 4000 r / min, which can not only ensure the separation effect but also take into account the stable operation of the centrifuge 230 and energy consumption savings.

[0052] The waste oil purification system of the present utility model integrates devices such as a heater 210, a negative pressure evaporator 220, a centrifuge 230, and a vacuum pump 240 to form a closed-loop centrifugal circulation path 200. The waste oil is first sent into the centrifugal circulation tank 100 and heated by the heater 210 to improve the evaporation efficiency of each component in the waste oil. The heated oil enters the negative pressure evaporator 220. Under the negative pressure environment generated by the vacuum pump 240, low-boiling impurities evaporate rapidly, realizing the preliminary separation of the oil from the impurities. The evaporated gas part is treated by condensation and recovery, while the purified oil enters the centrifuge 230 for further refinement and separation, and finally returns to the centrifugal circulation tank 100. Through the purified oil output path 300, the oil purified through the centrifugal circulation path 200 can be further processed by a first pressure pump 310 and a fine filter 320, effectively removing impurities such as fine particles and suspended matters in the oil, improving the cleanliness and purity of the oil, meeting the requirements of higher-standard reuse, and by controlling the opening and closing of the filtration circulation valve 330 and the oil outlet valve 340, it is possible to flexibly select to return the purified oil to the centrifugal circulation tank 100 for recirculation treatment or directly output it as finished purified oil.

[0053] The present utility model can effectively remove harmful substances in the waste oil during the purification process, reduce the pollution to the environment caused by directly discharging the waste oil. By optimizing the heating and evaporation processes, as well as the reasonable design of energy recovery and utilization, it can efficiently and continuously process the waste oil and achieve its purification and reuse.

[0054] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A waste oil purification system, comprising a centrifugal circulation tank (100), characterized in that: The centrifugal circulation path (200) also includes a centrifugal circulation path (200) starting and ending at the centrifugal circulation tank (100), wherein the centrifugal circulation path (200) is provided with a heater (210), a negative pressure evaporator (220), a centrifuge (230) and a vacuum pump (240), wherein the inlet of the heater (210) is connected to the outlet of the centrifugal circulation tank (100), the outlet of the heater (210) is connected to the inlet of the negative pressure evaporator (220), and the outlet of the negative pressure evaporator (220) is divided into two paths, one of which is connected to the outlet of the negative pressure evaporator (220). A pipeline with a heating circulation valve (291) returns to the centrifugal circulation tank (100), and another pipeline is connected to the inlet of the centrifuge (230) through a pipeline controlled by a centrifugal circulation valve (292), and the outlet of the centrifuge (230) returns to the centrifugal circulation tank (100); the vacuum pump (240) is connected to the vacuum interface of the negative pressure evaporator (220), and the vacuum pump (240) is used to generate negative pressure to suck the oil in the centrifugal circulation tank (100) into the negative pressure evaporator (220).

2. The waste oil purification system according to claim 1, characterized in that: The invention also comprises a purified oil output path (300), wherein a first pressure pump (310) and a fine filter (320) are provided on the purified oil output path (300), wherein the inlet of the first pressure pump (310) is connected to the outlet of the centrifugal circulation tank (100), and the outlet of the first pressure pump (310) is connected to the fine filter (320), and the outlet of the fine filter (320) is divided into two paths, one of which is a filtering circulation pipeline returning to the centrifugal circulation tank (100), and the other is an output pipeline for outputting purified clean oil liquid, wherein a filtering circulation valve (330) is provided on the filtering circulation pipeline, and an oil outlet valve (340) is provided on the clean oil liquid output pipeline.

3. The waste oil purification system according to claim 2, characterized in that: A plurality of fine filters (320) are arranged in parallel on the purified oil output path (300).

4. The waste oil purification system according to claim 3, characterized in that: The centrifugal circulation tank (100) is also provided with a first temperature sensor (110) and / or a first liquid level sensor (120), and a second temperature sensor (270) and / or a flow sensor (280) are also provided on the pipeline connecting the outlet of the heater (210) and the negative pressure evaporator (220).

5. The waste oil purification system according to claim 4, characterized in that: An oil inlet valve (211) and / or a coarse filter (212) is provided on a pipeline connecting the inlet of the heater (210) and the outlet of the centrifugal circulation tank (100).

6. The waste oil purification system according to any one of claims 1 to 5, characterized in that: The centrifugal circulation tank (100) is provided with a stirring device (130), and the stirring device (130) is used to stir the oil liquid in the centrifugal circulation tank (100).

7. The waste oil purification system according to claim 6, characterized in that: The outlet of the negative pressure evaporator (220) is provided with a second pressure pump (250) and a first one-way valve (260) in sequence, wherein the second pressure pump (250) is used to pressurize and output the treated oil in the negative pressure evaporator (220), and the first one-way valve (260) is used to prevent the oil from flowing back.

8. The waste oil purification system according to claim 7, characterized in that: A cooler (241) and a cooling buffer tank (242) are connected in series in sequence on the pipeline connecting the vacuum pump (240) and the vacuum interface of the negative pressure evaporator (220); a second one-way valve (243) is provided between the cooling buffer tank (242) and the vacuum pump (240); a drain pipe is connected to the cooler (241); a water storage tank (2411) is connected to the drain pipe; a drain valve (2412) is provided at the water outlet of the water storage tank (2411).

9. The waste oil purification system according to claim 8, characterized in that: A residual oil tank is provided in the centrifuge (230), and residual oil in the centrifuge (230) is discharged into the residual oil tank. The residual oil in the residual oil tank is returned to the centrifugal circulation tank (100) through a residual oil pipeline (231), and an emptying oil pump (232) is provided on the residual oil pipeline (231).

10. The waste oil purification system according to claim 1, characterized in that: The vacuum degree in the negative pressure evaporator (220) is -0.09 MPa to -0.08 MPa.

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