Evaporation system and process for positive pressure treatment of mineral oil-containing wastewater

Abstract

The invention belongs to the technical field of wastewater treatment, and discloses an evaporation system and process for positive pressure treatment of mineral oil-containing wastewater, and the system comprises the following main parts: a water inlet system, which is used for conveying the mineral oil-containing wastewater to an evaporator; the pretreatment unit is used for carrying out preliminary filtration and chemical treatment on the wastewater so as to remove large-particle impurities and part of soluble pollutants; and the evaporator adopts a positive pressure evaporation technology, moisture is rapidly evaporated through heating and pressure control, and mineral oil is concentrated and separated. According to the system, efficient water evaporation can be achieved at the relatively low temperature, the high-temperature and high-pressure conditions needed by a traditional evaporation process are remarkably reduced, and therefore energy consumption is reduced, improvement of the energy efficiency is beneficial to reduction of the operation cost, the positive effect on environmental protection is achieved, and the system is suitable for popularization and application. By applying the positive pressure evaporation technology, the water evaporation speed is increased, and the concentration and separation efficiency of the mineral oil is also improved.

Description

Technical Field

[0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to an evaporation system for positive pressure treatment of wastewater containing mineral oil. Background Art

[0002] The main components of waste mineral oil are waste engine oil, waste lubricating oil, waste hydraulic oil, sludge, base oil, etc., and the oil components are mixed with granular solids, iron filings, sludge, etc., and the viscosity is about 70-80cSt at 40°C. The main hazardous substances in waste mineral oil are: C15-C36 alkanes, polycyclic aromatic hydrocarbons (PAHS), olefins, benzene series, phenols, etc., which are toxic substances. The sulfides, petroleum substances, and eutrophic substances contained in them are particularly serious pollutants to water and soil. Once entering the external environment, they will cause serious environmental pollution. When using conventional treatment processes, the dosage is large, the process is complicated, and the water quality of the produced water fluctuates greatly. The existing oily wastewater generally adopts "dosing demulsification-oil separation sedimentation-anaerobic aerobic-flotation" or "oil separation demulsification-coagulation flotation-vibration ultrafiltration-hydrolysis acidification-contact oxidation-MBR", but the existing technology has the following disadvantages;

[0003] Traditional evaporation processes usually require high temperature and high pressure conditions, resulting in high energy consumption and limited evaporation efficiency. In addition, some treatment processes involve the use of chemical agents, which may cause secondary pollution problems and fail to fully recover the water in the wastewater, leading to a waste of water resources. Summary of the invention

[0004] The present invention aims at the problem that the prior art requires high temperature and high pressure conditions, resulting in high energy consumption and limited evaporation efficiency, and some treatment processes use chemical agents, which may cause secondary pollution problems, and fail to fully recover the water in the wastewater, resulting in waste of water resources. The following technical solutions are proposed:

[0005] An evaporation system for positive pressure treatment of wastewater containing mineral oil, the system comprises the following main parts:

[0006] Water inlet system: used to transport wastewater containing mineral oil to the evaporator.

[0007] Pretreatment unit: preliminary filtration and chemical treatment of wastewater to remove large particle impurities and some soluble pollutants.

[0008] Evaporator: Positive pressure evaporation technology is used to quickly evaporate water through heating and pressure control, and the mineral oil is concentrated and separated.

[0009] Condensation system: condenses the evaporated water vapor into liquid water for recycling.

[0010] Oil-water separator: Separates and collects concentrated mineral oil for subsequent processing.

[0011] Energy recovery system: Utilize the heat generated during the evaporation process to recover heat energy and improve the overall energy efficiency of the system.

[0012] Automatic monitoring system: real-time monitoring of the system's operating status, including temperature, pressure, flow and other parameters, to ensure safe and efficient operation of the system.

[0013] Waste treatment unit: The separated mineral oil is further processed, such as refining or conversion into other usable resources.

[0014] A process for an evaporation system for positive pressure treatment of wastewater containing mineral oil, comprising the following steps:

[0015] Step 1: Wastewater pretreatment: Preliminary filtration of mineral oil-containing wastewater to remove large particle impurities, and treatment with chemical agents to reduce the concentration of pollutants in the water.

[0016] Step 2: Positive pressure evaporation: The pretreated wastewater is sent to the evaporator and heated under positive pressure to evaporate the water and concentrate the mineral oil.

[0017] Step 3: Condensation recovery: The evaporated water vapor is cooled through the condensation system, converted into liquid water, and recovered to the water storage tank.

[0018] Step 4: Mineral oil separation: The concentrated mineral oil is separated from the water through an oil-water separator, and the mineral oil can be further recovered or processed.

[0019] Step 5: Energy recovery: Recover the heat generated during the evaporation process and use it to preheat water or other process steps to reduce energy consumption.

[0020] Step 6: Automatic monitoring: Use sensors to monitor various system parameters in real time to ensure that the system operates in the best condition.

[0021] Step 7; Waste treatment: Refine or transform the separated mineral oil to reduce waste generation and improve resource utilization.

[0022] Step 8; System maintenance: Regularly inspect and maintain the system to ensure the normal operation of each component and extend the service life of the equipment.

[0023] A process for an evaporation system for positive pressure treatment of wastewater containing mineral oil, comprising an oil-water separator, pipes are integrally formed on both sides of the oil-water separator, a filter element is installed inside the oil-water separator, a conical cover is fixedly installed on the top of the inner wall of the oil-water separator, and an oil-water separation structure is fixedly installed in the middle of the filter element;

[0024] The oil-water separation structure includes a placement box fixedly connected to the top of the filter element, a rotating rod is rotatably connected inside the placement box, a stirring blade is fixedly installed at the bottom end of the rotating rod, a driving member is fixedly installed in the middle of the outer surface of the rotating rod, a lifting column is fixedly installed at one end of the cylinder, the lifting column is movably connected to the placement box, a piston is fixedly installed at the top of the placement box, the piston is movably connected to the placement box, an oil suction pipe is equidistantly embedded and installed on the outside of the placement box, a one-way valve is installed at one end of the oil suction pipe, an extrusion pipe is fixedly installed at the bottom of the placement box, the top of the extrusion pipe is connected to a fixed cover, and an oil-water separation filter cloth is fixedly installed inside the fixed cover.

[0025] As a preferred embodiment of the above technical solution, the driving member is shaped as a hollow cylinder, wave grooves are equidistantly provided on the outer side of the driving member, and the cylinder is located inside the wave grooves.

[0026] As a preferred embodiment of the above technical solution, a return pipe is fixedly installed at the bottom of the fixed cover, and the return pipe runs through the placement box. A fixing ring is installed inside the extruded tube, and a spring rod is embedded and installed at an equal distance at the bottom of the fixing ring. A lifting cover is embedded and installed at the bottom of the spring rod. A plurality of support rods are fixedly installed at equal distances inside the lifting cover, and a plug is fixedly installed between the tops of the plurality of support rods.

[0027] As a preferred embodiment of the above technical solution, the top edge of the plugging head is provided with a rounded corner, the top diameter of the lifting cover is larger than the bottom diameter, and the distance between the minimum diameter of the inner wall of the lifting cover and the maximum diameter of the outer side of the plugging head is two centimeters.

[0028] As a preferred embodiment of the above technical solution, a mounting rod is fixedly installed on the top of the fixed cover, a plurality of columns are welded to the top of the mounting rod, a same mounting plate is fixed between the tops of the plurality of columns, a touch switch is fixedly installed on the bottom of the mounting plate, an alarm is fixedly installed in the middle of the top of the mounting plate, and a battery is installed between the outer side of the alarm and the inner wall of the mounting plate.

[0029] As a preferred embodiment of the above technical solution, a T-shaped rod is vertically slidably connected to the middle of the installation rod, and a floating block is fixedly installed at the bottom end of the T-shaped rod.

[0030] As a preferred embodiment of the above technical solution, the number of the oil suction pipes, the squeeze pipes and the water return pipes is the same, and the diameters of the oil suction pipes, the squeeze pipes and the water return pipes are the same.

[0031] The beneficial effects of the present invention are:

[0032] (1) Through positive pressure evaporation technology, the system can achieve efficient water evaporation at a relatively low temperature, significantly reducing the high temperature and high pressure conditions required by traditional evaporation processes, thereby reducing energy consumption. This improvement in energy efficiency not only helps to reduce operating costs, but also plays a positive role in environmental protection. The application of positive pressure evaporation technology accelerates the evaporation rate of water and improves the concentration and separation efficiency of mineral oil. Compared with traditional processes, the system can treat wastewater more quickly and improve the overall treatment capacity;

[0033] (2) While using chemical agents in the pretreatment unit, this system has designed an effective filtration and separation mechanism to remove large particle impurities and soluble pollutants in the wastewater to the maximum extent, reducing the use of chemical agents and thus reducing the risk of secondary pollution;

[0034] (3) Through the condensation system, the evaporated water vapor is effectively cooled and converted into liquid water, which can realize the recycling of water resources. This process not only improves the utilization rate of water, but also reduces the dependence on fresh water sources, which is in line with the concept of sustainable development;

[0035] (4) It can automatically complete the oil-water separation process without manual intervention, and can effectively separate oil and water by utilizing the density difference between oil and water and the reciprocating motion of the piston, thereby reducing the discharge of wastewater, effectively protecting the environment and promoting resource recycling;

[0036] (5) It can collect oil stains in a centralized manner, reducing the difficulty of subsequent cleaning, making it easier to clean the inside of the oil-water separation filter cloth and improving cleaning efficiency;

[0037] (6) The sound of the alarm reminds personnel that the filter device has reached the load, thereby prompting personnel to replace the filter structure and clean or replace it, avoiding damage to the equipment due to long-term operation, thereby ensuring the normal operation of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 Shown is a schematic diagram of the structure of the oil-water separator in the mounting plate 1;

[0039] Figure 2 Shown is a cross-sectional view of the oil-water separator in Example 1;

[0040] Figure 3 Shown is a schematic structural diagram of the oil-water separation structure in Example 1;

[0041] Figure 4 The figure shows a schematic diagram of the installation structure of the driving member in the embodiment 1;

[0042] Figure 5 The figure shows a schematic diagram of the installation structure of the piston in Example 1;

[0043] Figure 6 What is shown is a schematic diagram of the structure of the water return pipe in Example 1;

[0044] Figure 7 It is shown that Figure 6 Schematic diagram of the structure of the middle A area;

[0045] Figure 8 The figure shows a schematic diagram of the installation structure of the plug in Example 1;

[0046] Fig. 9 What is shown is a schematic diagram of the installation structure of the installation disk in Example 1.

[0047] In the figure: 1. oil-water separator; 2. pipeline; 3. filter element; 4. conical cover; 5. oil-water separation structure; 51. rotating rod; 52. stirring blade; 53. driving member; 54. cylinder; 55. lifting column; 56. piston; 57. placement box; 58. oil suction pipe; 59. one-way valve; 510. extrusion tube; 511. fixed cover; 512. oil-water separation filter cloth; 513. return pipe; 514. fixing ring; 515. spring rod; 516. lifting cover; 517. support rod; 518. plug; 519. installation rod; 520. column; 521. T-bar; 522. floating block; 523. installation plate; 524. touch switch; 525. battery; 526. alarm. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0049] Example 1

[0050] The present invention provides an evaporation system for positive pressure treatment of wastewater containing mineral oil, such as Figures 1 to 9 As shown, the system includes the following main parts:

[0051] Water inlet system: used to transport wastewater containing mineral oil to the evaporator.

[0052] Pretreatment unit: preliminary filtration and chemical treatment of wastewater to remove large particle impurities and some soluble pollutants.

[0053] Evaporator: Positive pressure evaporation technology is used to quickly evaporate water through heating and pressure control, and the mineral oil is concentrated and separated.

[0054] Condensation system: condenses the evaporated water vapor into liquid water for recycling.

[0055] Oil-water separator: Separates and collects concentrated mineral oil for subsequent processing.

[0056] Energy recovery system: Utilize the heat generated during the evaporation process to recover heat energy and improve the overall energy efficiency of the system.

[0057] Automatic monitoring system: real-time monitoring of the system's operating status, including temperature, pressure, flow and other parameters, to ensure safe and efficient operation of the system.

[0058] Waste treatment unit: The separated mineral oil is further processed, such as refining or conversion into other usable resources.

[0059] A process for an evaporation system for positive pressure treatment of wastewater containing mineral oil, comprising the following steps:

[0060] Step 1: Wastewater pretreatment: Preliminary filtration of mineral oil-containing wastewater to remove large particle impurities, and treatment with chemical agents to reduce the concentration of pollutants in the water.

[0061] Step 2: Positive pressure evaporation: The pretreated wastewater is sent to the evaporator and heated under positive pressure to evaporate the water and concentrate the mineral oil.

[0062] Step 3: Condensation recovery: The evaporated water vapor is cooled through the condensation system, converted into liquid water, and recovered to the water storage tank.

[0063] Step 4: Mineral oil separation: The concentrated mineral oil is separated from the water by the oil-water separator 1, and the mineral oil can be further recovered or processed.

[0064] Step 5: Energy recovery: Recover the heat generated during the evaporation process and use it to preheat water or other process steps to reduce energy consumption.

[0065] Step 6: Automatic monitoring: Use sensors to monitor various system parameters in real time to ensure that the system operates in the best condition.

[0066] Step 7; Waste treatment: Refine or transform the separated mineral oil to reduce waste generation and improve resource utilization.

[0067] Step 8; System maintenance: Regularly inspect and maintain the system to ensure the normal operation of each component and extend the service life of the equipment.

[0068] A process for an evaporation system for positive pressure treatment of wastewater containing mineral oil, comprising an oil-water separator 1, with pipes 2 integrally formed on both sides of the oil-water separator 1, one of the pipes 2 being a water inlet pipe, and the other pipe 2 being a water outlet pipe, a filter element 3 being installed inside the oil-water separator 1, a cone cover 4 being fixedly installed on the top of the inner wall of the oil-water separator 1, and an oil-water separation structure 5 being fixedly installed in the middle of the filter element 3;

[0069] The oil-water separation structure 5 includes a placement box 57 fixedly connected to the top of the filter element 3, a rotating rod 51 is rotatably connected inside the placement box 57, a stirring blade 52 is fixedly installed at the bottom end of the rotating rod 51, a driving member 53 is fixedly installed in the middle of the outer surface of the rotating rod 51, a cylinder 54 is movably connected to the outside of the driving member 53, a lifting column 55 is fixedly installed at one end of the cylinder 54, the lifting column 55 is movably connected to the inside of the placement box 57, a piston 56 is fixedly installed at the top of the placement box 57, the piston 56 is movably connected to the inside of the placement box 57, an oil suction pipe 58 is equidistantly embedded and installed on the outside of the placement box 57, a one-way valve 59 is installed at one end of the oil suction pipe 58, an extrusion tube 510 is fixedly installed at the bottom of the placement box 57, a fixed cover 511 is connected to the top of the extrusion tube 510, and an oil-water separation filter cloth 512 is fixedly installed inside the fixed cover 511.

[0070] like Figure 4 As shown, the driving member 53 is in the shape of a hollow cylinder, and wave grooves are evenly spaced on the outside of the driving member 53, and the cylinder 54 is located inside the wave grooves;

[0071] Since the driving member 53 drives the cylinder 54 to move up and down inside the wave groove when it rotates, the cylinder 54 is driven to move up and down at this time, which changes the difficulty of the cylinder 54 moving up and down.

[0072] like Figure 7 and Figure 8 As shown, a return pipe 513 is fixedly installed at the bottom of the fixed cover 511, and the return pipe 513 runs through the placement box 57. A fixing ring 514 is installed inside the extrusion tube 510, and a spring rod 515 is embedded and installed at the bottom of the fixing ring 514 at equal distances. A lifting cover 516 is embedded and installed at the bottom of the spring rod 515. A plurality of support rods 517 are fixedly installed at equal distances inside the lifting cover 516, and a plug 518 is fixedly installed between the top ends of the plurality of support rods 517. A rounded corner is provided at the top edge of the plug 518. The top diameter of the lifting cover 516 is larger than the bottom diameter. The distance between the minimum diameter of the inner wall of the lifting cover 516 and the maximum diameter of the outer side of the plug 518 is two centimeters.

[0073] Due to the telescopic force of the spring rod 515, the lifting cover 516 is driven to move. When the lifting cover 516 moves, the plugging head 518 is driven to move through the support rod 517. When the plugging head 518 moves, the inside of the fixed ring 514 is sealed. At this time, the problem of preventing the liquid from flowing along the inside of the fixed ring 514 and at the same time preventing the liquid from entering the inside of the extrusion tube 510. On the contrary, due to the gas pressure driving the plugging head 518 to move, when the plugging head 518 moves, the spring rod 515 is stretched through the support rod 517 and the lifting cover 516. At this time, the oil stains enter the outside of the plugging head 518 along the fixed ring 514, and enter the inside of the lifting cover 516 along the plugging head 518, and then enter the inside of the extrusion tube 510 along the lifting cover 516, thereby allowing the liquid to flow.

[0074] like Figure 7 and Fig. 9 As shown, a mounting rod 519 is fixedly installed on the top of the fixed cover 511, and a plurality of columns 520 are welded on the top of the mounting rod 519. A same mounting plate 523 is fixed between the tops of the plurality of columns 520. A touch switch 524 is fixedly installed on the bottom of the mounting plate 523. An alarm 526 is fixedly installed on the middle of the top of the mounting plate 523. A battery 525 is installed between the outer side of the alarm 526 and the inner wall of the mounting plate 523.

[0075] As the mounting rod 519 rises and contacts the touch switch 524, the touch switch 524 connects the power between the battery 525 and the alarm 526, and enables the alarm 526 to operate. The alarm 526 generates a sound when it operates, and the sound of the alarm 526 prompts personnel that the filter device has reached the load, thereby prompting personnel to replace and clean the filter structure.

[0076] like Figure 6 and Fig. 9 As shown, a T-shaped rod 521 is vertically slidably connected to the middle of the mounting rod 519, and a floating block 522 is fixedly installed at the bottom end of the T-shaped rod 521;

[0077] The buoyancy of the oil stain drives the float block 522 to rise. When the float block 522 rises, it drives the T-shaped rod 521 to rise and fall inside the installation rod 519, thereby changing the difficulty of lifting and lowering the installation rod 519.

[0078] like Figures 4 to 6 As shown, the number of the oil suction pipe 58, the squeeze pipe 510 and the water return pipe 513 is the same, and the diameters of the oil suction pipe 58, the squeeze pipe 510 and the water return pipe 513 are the same;

[0079] It can make the extracted oil stains, discharged oil stains and returned water flow, preventing the problem of liquid accumulation inside the storage box 57 due to the different numbers and sizes of the oil suction pipe 58, the squeeze pipe 510 and the return water pipe 513, thereby facilitating the operation of the overall equipment.

[0080] Working principle: As the mineral oil wastewater enters the oil-water separator 1 along the pipe 2 of the oil-water separator 1, the filter element 3 inside the oil-water separator 1 filters the oil stains, and since the oil-containing wastewater is stored inside the oil-water separator 1 in the initial process, and the liquid level inside the oil-water separator 1 rises, during the liquid level rise, since the density of oil is less than the density of water, the oil gathers inside along the conical cover 4, and in the secondary process, since the water flows inside the oil-water separator 1, the stirring blade 52 is driven to operate, and the stirring blade 52 drives the rotating rod 51 to rotate when it operates, and the rotating rod 51 drives the driving member 53 to rotate when it rotates, and the driving member 53 drives the cylinder 5 4 moves upward. When the cylinder 54 moves upward, the piston 56 is driven upward by the lifting column 55. When the piston 56 moves upward, the bottom of the placement box 57 absorbs gas. At this time, the lifting cover 516 is driven to move by the telescopic force of the spring rod 515. When the lifting cover 516 moves, the plugging head 518 is driven to move through the support rod 517. When the plugging head 518 moves, the inside of the fixing ring 514 is sealed, so that the gas cannot move along the inside of the extrusion tube 510, resulting in the gas only being able to move along the inside of the oil suction pipe 58. At this time, the suction force absorbs the oil stains on the surface of the wastewater, so that the oil stains enter the inside of the placement box 57 along the one-way valve 59 and are located at the bottom of the piston 56, and then move in the opposite direction. Since the one-way valve 59 can only flow in one direction, the gas cannot flow in the opposite direction along the one-way valve 59, so the compressed gas is used to drive the plugging head 518 to move. When the plugging head 518 moves, the support rod 517 and the lifting cover 516 drive the spring rod 515 to stretch. At this time, the oil stains enter the outside of the plugging head 518 along the fixing ring 514, and enter the lifting cover 516 along the plugging head 518, and then enter the extrusion tube 510 along the lifting cover 516. After reciprocating motion, the liquid enters the fixed cover 511 along the extrusion tube 510, and finally separates the oil and water along the oil-water separation filter cloth 512 inside the fixed cover 511. The separated oil stains are The surface of the oil-water separation filter cloth 512, at this time, the liquid enters the interior of the fixed cover 511, and because the overall height of the placement box 57 is higher than the liquid level, at this time, under the action of the liquid difference, the water enters the filter element 3 of the oil-water separator 1 along the return pipe 513. This method can automatically complete the oil-water separation process without manual intervention, and utilizes the density difference between oil and water and the reciprocating motion of the piston 56 to effectively separate oil and water, thereby reducing the discharge of wastewater, effectively protecting the environment and promoting resource recycling. At the same time, the oil stains are collected in a centralized manner, reducing the subsequent cleaning difficulty, thereby facilitating the cleaning of the interior of the oil-water separation filter cloth 512 and improving the cleaning efficiency;

[0081] Finally, due to the accumulation of oil stains on the surface of the oil-water separation filter cloth 512, the buoyancy of the oil stains drives the float 522 to rise. When the float 522 rises, it drives the T-bar 521 to rise and fall inside the mounting rod 519. When the mounting rod 519 rises, it contacts the touch switch 524. After the touch switch 524 contacts, the power supply between the battery 525 and the alarm 526 is connected, and the alarm 526 is operated. The alarm 526 generates a sound when it is running. The sound of the alarm 526 prompts personnel that the filter device has reached the load, thereby prompting personnel to replace the filter structure, clean or replace it, to avoid damage to the equipment due to long-term operation, thereby ensuring the normal operation of the device.

[0082] The above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them.

Claims

1. An evaporation system for positive pressure treatment of mineral oil-containing wastewater, characterized in that: The system consists of the following main parts: Water inlet system: used to transport wastewater containing mineral oil to the evaporator. Pretreatment unit: preliminary filtration and chemical treatment of wastewater to remove large particle impurities and some soluble pollutants. Evaporator: Positive pressure evaporation technology is used to quickly evaporate water through heating and pressure control, and the mineral oil is concentrated and separated. Condensation system: condenses the evaporated water vapor into liquid water for recycling. Oil-water separator: Separates and collects concentrated mineral oil for subsequent processing. Energy recovery system: Utilize the heat generated during the evaporation process to recover heat energy and improve the overall energy efficiency of the system. Automatic monitoring system: real-time monitoring of the system's operating status, including temperature, pressure, flow and other parameters, to ensure safe and efficient operation of the system. Waste treatment unit: The separated mineral oil is further processed, such as refining or conversion into other usable resources.

2. The process of an evaporation system for positive pressure treatment of mineral oil-containing wastewater according to claim 1, characterized in that: The following steps are involved: Step 1: Wastewater pretreatment: Preliminary filtration of wastewater containing mineral oil to remove large particles of impurities, and treatment with chemical agents to reduce the concentration of pollutants in the water. Step 2: Positive pressure evaporation: The pretreated wastewater is sent to the evaporator and heated under positive pressure to evaporate the water and concentrate the mineral oil. Step 3: Condensation recovery: The evaporated water vapor is cooled through the condensation system, converted into liquid water, and recovered to the water storage tank. Step 4: Mineral oil separation: The concentrated mineral oil is separated from the water by an oil-water separator (1), and the mineral oil can be further recovered or processed. Step 5: Energy recovery: Recover the heat generated during the evaporation process and use it to preheat water or other process steps to reduce energy consumption. Step 6: Automatic monitoring: Use sensors to monitor various system parameters in real time to ensure that the system operates in the best condition. Step 7; Waste treatment: Refine or transform the separated mineral oil to reduce waste generation and improve resource utilization. Step 8; System maintenance: Regularly inspect and maintain the system to ensure the normal operation of each component and extend the service life of the equipment.

3. The process of an evaporation system for positive pressure treatment of mineral oil-containing wastewater according to claim 2, characterized in that: It comprises an oil-water separator (1), pipelines (2) are integrally formed on both sides of the oil-water separator (1), a filter element (3) is installed inside the oil-water separator (1), a conical cover (4) is fixedly installed on the top of the inner wall of the oil-water separator (1), and an oil-water separation structure (5) is fixedly installed in the middle of the filter element (3); The oil-water separation structure (5) comprises a placement box (57) fixedly connected to the top of the filter element (3); a rotating rod (51) is rotatably connected inside the placement box (57); a stirring blade (52) is fixedly installed at the bottom end of the rotating rod (51); a driving member (53) is fixedly installed at the middle of the outer surface of the rotating rod (51); a cylinder (54) is movably connected to the outer side of the driving member (53); a lifting column (55) is fixedly installed at one end of the cylinder (54); and the lifting column (55) is movably connected to the placement box (57). ) inside, a piston (56) is fixedly installed on the top of the placement box (57), and the piston (56) is movably connected to the inside of the placement box (57). An oil suction pipe (58) is equidistantly embedded and installed on the outside of the placement box (57), and a one-way valve (59) is installed at one end of the oil suction pipe (58). An extrusion tube (510) is fixedly installed on the bottom end of the placement box (57), and a fixed cover (511) is connected to the top of the extrusion tube (510), and an oil-water separation filter cloth (512) is fixedly installed inside the fixed cover (511).

4. The process of an evaporation system for positive pressure treatment of mineral oil-containing wastewater according to claim 3, characterized in that: The driving member (53) is in the shape of a hollow cylinder, and wave grooves are equidistantly formed on the outside of the driving member (53), and the cylinder (54) is located inside the wave grooves.

5. The process of an evaporation system for positive pressure treatment of mineral oil-containing wastewater according to claim 3, characterized in that: A return water pipe (513) is fixedly installed at the bottom end of the fixed cover (511), and the return water pipe (513) passes through the placement box (57). A fixing ring (514) is installed inside the extrusion tube (510), and spring rods (515) are embedded and installed at equal distances at the bottom end of the fixing ring (514), and a lifting cover (516) is embedded and installed at the bottom end of the spring rod (515). A plurality of support rods (517) are fixedly installed at equal distances inside the lifting cover (516), and plugs (518) are fixedly installed between the top ends of the plurality of support rods (517).

6. The process of an evaporation system for positive pressure treatment of mineral oil-containing wastewater according to claim 5, characterized in that: The top edge of the plugging head (518) is rounded, the top diameter of the lifting cover (516) is larger than the bottom diameter, and the distance between the minimum diameter of the inner wall of the lifting cover (516) and the maximum diameter of the outer side of the plugging head (518) is two centimeters.

7. The process of an evaporation system for positive pressure treatment of mineral oil-containing wastewater according to claim 5, characterized in that: A mounting rod (519) is fixedly mounted on the top of the fixed cover (511), a plurality of columns (520) are welded to the top of the mounting rod (519), a same mounting plate (523) is fixed between the tops of the plurality of columns (520), a touch switch (524) is fixedly mounted on the bottom of the mounting plate (523), an alarm (526) is fixedly mounted in the middle of the top of the mounting plate (523), and a battery (525) is installed between the outer side of the alarm (526) and the inner wall of the mounting plate (523).

8. The process of the evaporation system for positive pressure treatment of mineral oil-containing wastewater according to claim 7, characterized in that: A T-shaped rod (521) is vertically slidably connected to the middle of the installation rod (519), and a floating block (522) is fixedly installed at the bottom end of the T-shaped rod (521).

9. The process of an evaporation system for positive pressure treatment of mineral oil-containing wastewater according to claim 3, characterized in that: The oil suction pipe (58), the squeeze pipe (510) and the water return pipe (513) are of the same number, and the oil suction pipe (58), the squeeze pipe (510) and the water return pipe (513) are of the same diameter.

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