Recycling system of waste mineral oil

Abstract

The invention discloses a waste mineral oil recycling system and relates to the technical field of waste mineral oil recycling. A guide pipe is welded to the center of the bottom of the separation tank, the bottom of the separation tank is connected with an oil conveying pipe, the oil conveying pipe is communicated with the guide pipe, a center pipe is in clearance fit connection in the guide pipe through a sealing ring, and the upper portion of the center pipe is fixedly connected with a floating disc. The device has the beneficial effects that the density of the floating disc and the density of the central pipe are between 0.88 Kg / m and 0.92 Kg / m, the floating disc is made of a super-hydrophobic oleophylic material, the friction force between the central pipe and the guide pipe is the same, the floating disc is always located between oil and water interfaces, and as the super-hydrophobic oleophylic material is an oil infiltration material, waste mineral oil located on the oil and water interfaces is located in the capillary pipe, and the friction force between the central pipe and the guide pipe is the same. The waste mineral oil rises to the upper part of the floating disc through capillarity and flows into the central pipe, and as the super-hydrophobic oleophylic material is not a water infiltrating material, the capillarity of water on an oil-water interface is avoided, and the purpose of oil-water separation is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of waste mineral oil recovery, and particularly relates to a waste mineral oil recovery and utilization system. Background Art

[0002] Waste mineral oil refers to the mineral oil extracted and refined from petroleum, coal, and oil shale, which has changed its original physical and chemical properties due to external factors during the processes of mining, processing, and use and cannot be used continuously. The main harmful substances in waste mineral oil are alkanes, alkenes, benzene series, etc. with carbon numbers from C15 to C36. Once it enters the external environment, it will cause serious environmental pollution. When water is mixed into lubricating oil, many harms will occur: water reacts with oil to form acids, gums, and sludge; it reduces lubricity and accelerates the wear of high-stress components. Therefore, when recovering waste mineral oil, the water in the oil must be separated, and the substances with harmful properties in the separated waste mineral oil also need to be treated harmlessly or degraded to reduce environmental pollution. CN 114292667 B discloses a waste mineral oil recovery and utilization system that uses a floating plate to recover waste mineral oil. The floating plate is connected to the separation tank through a corrugated pipe, enabling the floating plate to rise or fall with the oil-water interface. However, the elastic resistance of the corrugated pipe increases when it is compressed, and it cannot ensure that the floating plate is located at the oil-water interface. In this technical solution, a capillary is provided inside the floating plate. Capillary action is the phenomenon of the liquid level rising in the tube due to surface tension overcoming gravity. However, when the capillary is in a horizontal state, it cannot cause the cross-section of the oil to rise and separate from the water. When recovering waste mineral oil, there is still oil in the water, resulting in a low recovery rate and the need for subsequent treatment of the water. Summary of the Invention

[0003] In order to solve the problem of low recovery rate during the reuse of waste mineral oil at present, the present invention provides a waste mineral oil recovery and utilization system.

[0004] The technical solution provided by the present invention is: a waste mineral oil recovery and utilization system, including a separation tank and a degradation tank. An oil inlet pipe is provided on one side of the separation tank. The inlet of the oil inlet pipe is located below the separation tank, and the upper port of the oil inlet pipe is higher than the separation tank. The separation tank is a cylindrical hollow tank body. A guide pipe is welded at the center of the bottom of the separation tank. The bottom of the separation tank is connected to an oil delivery pipe, and the oil delivery pipe is communicated with the guide pipe. A central pipe is connected to the guide pipe through a clearance fit with a sealing ring inside the guide pipe, and a floating disk is fixedly connected to the upper part of the central pipe. The floating disk is of a disk-shaped structure. The upper end surface of the floating disk is a conical surface with a lower center and a higher periphery. The inner hole of the central pipe extends all the way to the upper end surface of the floating disk. The floating disk is provided with uniformly arranged closed cavities inside. The cavities are cylindrical. The floating disk is provided with capillary holes that penetrate up and down, and the capillary holes are evenly distributed around the circumference of the cavities. The density of the floating disk and the central pipe is between 0.88 and 0.92 Kg / m³. The floating disk is made of superhydrophobic and oleophilic material; A fuel transfer pump is connected in series on the fuel transfer pipe. The other end of the fuel transfer pipe is communicated with the degradation tank. The degradation tank is a square cavity container. The interface of the fuel transfer pipe and the degradation tank is located at the upper part of the side of the degradation tank. An LED lamp board is arranged in the degradation tank, and the LED lamp board is located at the top of the degradation tank.

[0005] A retaining plate is arranged along the upper edge of the floating disk. The retaining plate extends upward along the maximum diameter of the upper end surface of the floating disk. The height of the retaining plate is not greater than 5 mm. A layer of capillary material is welded from the middle part of the outer circle of the floating disk to the part beyond the retaining plate. The capillary material is made of superhydrophobic and oleophilic material.

[0006] An ultrasonic oscillator is installed on the inner wall of the cavity. The ultrasonic oscillators are evenly distributed along the circumference of the inner wall of the cavity. The ultrasonic oscillators are arranged on the inner wall of the lower half of the cavity.

[0007] A mirror reflector is arranged on the lower side of the LED lamp board in the degradation tank. The mirror reflector is located on the lower side of the fuel transfer pipe inlet. The mirror reflector horizontally separates the degradation tank. There is a section of gap between the front end and the rear end of the mirror reflector and the inner wall of the degradation tank. An over-flow pipe is arranged between the mirror reflector and the inner wall of the degradation tank, and an electric heating pipe is installed in the over-flow pipe.

[0008] A vent pipe A is arranged at the top of the degradation tank. The vent pipe A is filled with high-efficiency activated carbon. A feeding pipe is arranged at the top of the degradation tank. A sealing cap is arranged on the upper part of the feeding pipe. A vent pipe B is arranged at the top of the separation tank.

[0009] A valve seat pipe is arranged in the inner hole of the central pipe. The upper part of the valve seat pipe is a conical bell mouth. A floating cylinder is arranged in the valve seat pipe. A guide post is arranged at the lower part of the floating cylinder. The guide post extends into the valve seat pipe. The lower part of the floating cylinder is a conical ring surface. The conical ring surface of the floating cylinder is hermetically connected with the conical hole of the valve seat pipe through a conical surface. A pressure sensor is installed at the front end of the fuel transfer pump on the fuel transfer pipe.

[0010] The beneficial effects of the present invention are as follows: The density of the floating disk and the central pipe is between 0.88 and 0.92 Kg / m³. The floating disk is made of superhydrophobic and oleophilic material. Since the friction force between the central pipe and the guide pipe is the same when the floating disk rises and falls, the floating disk is always located between the oil-water interface. Since the superhydrophobic and oleophilic material is an oil-wetting material, the waste mineral oil at the oil-water interface is in the capillary tube, and the waste mineral oil rises to the upper part of the floating disk through capillary action and flows into the central pipe. Since the superhydrophobic and oleophilic material is not a water-wetting material, the water at the oil-water interface will not have capillary action, achieving the purpose of oil-water separation. By arranging ultrasonic oscillators in the cavity, the oil-water separation effect is further improved, and the recovery rate of waste mineral oil is increased. Description of the Drawings

[0011] Appendix Figure 1It is a schematic structural diagram of the present invention; Appendix Figure 2 It is a partial sectional view of the floating disk in the present invention; Appendix Figure 3 It is Appendix Figure 1 The enlarged view at position A of

[0012] In the figure, 1 - separation tank, 2 - degradation tank, 3 - inlet oil pipe, 4 - floating disk, 401 - cavity, 402 - capillary pore, 403 - enclosing plate, 404 - capillary substance, 5 - guiding pipe, 6 - oil transfer pump, 7 - oil transfer pipe, 8 - central pipe, 9 - valve seat pipe, 10 - float, 11 - pressure sensor, 12 - LED lamp board, 13 - mirror reflector, 14 - flow - through pipeline, 15 - electric heating pipe, 16 - ventilation pipe A, 17 - feeding pipe, 18 - sealing cap, 19 - ventilation pipe B, 20 - ultrasonic oscillator, 21 - high - efficiency activated carbon. Specific embodiments

[0013] As Figures 1 to 3 shown, a waste mineral oil recycling system includes a separation tank 1 and a degradation tank 2. One side of the separation tank 1 is provided with an inlet oil pipe 3. The inlet of the inlet oil pipe 3 is located below the separation tank 1, and the upper port of the inlet oil pipe 3 is higher than the separation tank 1. The separation tank 1 is a cylindrical hollow tank body. The center of the bottom of the separation tank 1 is welded with a guiding pipe 5. The bottom of the separation tank 1 is connected to an oil transfer pipe 7, and the oil transfer pipe 7 is communicated with the guiding pipe 5. The central pipe 8 is connected to the guiding pipe 5 through a clearance fit with a sealing ring. The upper part of the central pipe 8 is fixedly connected to the floating disk 4. Waste mineral oil enters the separation tank 1 from the inlet oil pipe 3, and the waste mineral oil slowly rises from the bottom of the separation tank 1. The waste mineral oil floats on the water surface, floating up the floating disk 4; The floating disk 4 is of a disc - shaped structure. The upper end surface of the floating disk 4 is a conical surface with a lower center and a higher periphery. The inner hole of the central pipe 8 extends to the upper end surface of the floating disk 4. The floating disk 4 is provided with uniformly arranged closed cavities 401. The cavities 401 are cylindrical. The floating disk 4 is provided with capillary pores 402 that penetrate up and down. The capillary pores 402 are evenly distributed around the circumference of the cavities 401; The density of the floating disk 4 and the central pipe 8 is between 0.88 and 0.92 Kg / m³. The floating disk 4 is made of a super - hydrophobic and oil - loving material. Since the friction force between the central pipe 8 and the guiding pipe 5 is the same when the floating disk 4 rises and falls, the floating disk 4 is always located between the oil - water interface. Since the super - hydrophobic and oil - loving material is a material that is wetted by oil, the waste mineral oil at the oil - water interface rises in the capillary 402 and flows into the central pipe 8 through capillary action. Since the super - hydrophobic and oil - loving material is not a material that is wetted by water, the water at the oil - water interface does not undergo capillary action, achieving the purpose of oil - water separation.

[0014] A fuel pipeline 7 is connected in series with a fuel pump 6. The other end of the fuel pipeline 7 is communicated with a degradation tank 2. The degradation tank 2 is a square cavity container. The interface between the fuel pipeline 7 and the degradation tank 2 is located at the upper part of the side surface of the degradation tank 2. An LED light board 12 is arranged in the degradation tank 2, and the LED light board 12 is located at the top of the degradation tank 2. WO3 photocatalyst is added into the waste mineral oil, and the light improves the degradation degree between the WO3 photocatalyst and the waste mineral oil.

[0015] A baffle 403 is arranged along the upper edge of the floating disc 4. The baffle 403 extends upward along the maximum diameter of the upper end surface of the floating disc 4, and the height of the baffle 403 is not greater than 5 mm. A layer of capillary material 404 is welded from the middle part of the outer circle of the floating disc 4 to the part beyond the baffle 403. The capillary material 404 is made of superhydrophobic and oleophilic material. The waste mineral oil floating outside the floating disc 4 seeps into the capillary material 404 and rises to the upper side of the floating disc 4 through capillary action.

[0016] An ultrasonic oscillator 20 is installed on the inner wall of the cavity 401. The ultrasonic oscillators 20 are evenly distributed along the inner wall circumference of the cavity 401, and the ultrasonic oscillators 20 are arranged on the lower half of the inner wall of the cavity 401.

[0017] Due to the non-linear effect of ultrasonic waves, acoustic cavitation will be generated. When the cavitation bubbles suddenly collapse, the shock wave generated can produce thousands of atmospheric pressures around it. The cavitation effect makes the tiny oil droplets vibrate and coalesce into large oil droplets, which rise in the capillary 402 to the upper surface of the floating disc 4, reducing the oil content in the water to a qualified value and improving the recovery rate of waste mineral oil.

[0018] A mirror reflector 13 is arranged on the lower side of the LED light board 12 in the degradation tank 2. The mirror reflector 13 is located on the lower side of the inlet of the fuel pipeline 7. The mirror reflector 13 horizontally separates the degradation tank 2. There is a gap between the front end and the rear end of the mirror reflector 13 and the inner wall of the degradation tank 2. An overflow pipeline 14 is arranged between the mirror reflector 13 and the inner wall of the degradation tank 2. An electric heating pipe 15 is installed in the overflow pipeline 14. The electric heating pipe 15 heats the waste mineral oil to improve the activity of the waste mineral oil. At the same time, the heated waste mineral oil will rise in the overflow pipeline 14 and form a circulating flow around the mirror reflector 13. The light emitted by the LED light board 12 is reflected by the mirror reflector 13 and contacts the waste mineral oil again. The continuous circulating flow of the waste mineral oil around the mirror reflector 13 enables the WO3 photocatalyst to fully degrade the phenolic harmful substances inside the oil, thereby further improving the degradation efficiency.

[0019] A ventilation pipe A16 is provided at the top of the degradation tank 2, and highly efficient activated carbon 21 is filled in the ventilation pipe A16. A feeding pipe 17 is provided at the top of the degradation tank 2, and a sealing cap 18 is provided at the upper part of the feeding pipe 17. WO3 photocatalyst is added through the feeding pipe. The WO3 photocatalyst will degrade the harmful phenol substances inside the waste mineral oil, and the highly efficient activated carbon 21 will adsorb the decomposed harmful gases to prevent environmental pollution. A ventilation pipe B19 is provided at the top of the separation tank 1.

[0020] A valve seat pipe 9 is provided in the inner hole of the central pipe 8. The upper part of the valve seat pipe 9 is a conical flare. A floating cylinder 10 is provided in the valve seat pipe 9. A guide post is provided at the lower part of the floating cylinder 10, and the guide post extends into the valve seat pipe 9. The lower part of the floating cylinder 10 is a conical ring surface. The conical ring surface of the floating cylinder 10 is hermetically connected to the conical hole of the valve seat pipe 9 through a conical surface. A pressure sensor 11 is installed at the front end of the oil delivery pump 6 on the oil delivery pipe 7. When the oil liquid level drops to the position of the floating cylinder 10, the floating cylinder 10 descends and seals with the valve seat pipe 9. When the pressure sensor 11 detects that the inside of the oil delivery pipe 7 is in negative pressure, the oil delivery pump 6 is stopped.

Claims

1. A waste mineral oil recycling system, comprising a separation tank (1) and a degradation tank (2), characterized in that: An oil inlet pipe (3) is provided on one side of the separation tank (1). The inlet of the oil inlet pipe (3) is located at the lower side of the separation tank (1). The upper end of the oil inlet pipe (3) is higher than the separation tank (1). The separation tank (1) is a cylindrical hollow tank body. A guide pipe (5) is welded at the center of the bottom of the separation tank (1). The bottom of the separation tank (1) is connected to an oil delivery pipe (7). The oil delivery pipe (7) is in communication with the guide pipe (5). The guide pipe (5) is connected to a center pipe (8) through a sealing ring gap fit. The upper part of the center pipe (8) is fixedly connected to a floating plate (4). The floating plate (4) is a disc-shaped structure. The upper end surface of the floating plate (4) is a conical surface with a low center and high surroundings. The inner hole of the central tube (8) extends all the way to the upper end surface of the floating plate (4). The floating plate (4) is provided with evenly arranged closed cavities (401). The cavities (401) are cylindrical. The floating plate (4) is provided with capillary holes (402) that penetrate from top to bottom. The capillary holes (402) are evenly distributed around the circumference of the cavities (401). The density of the floating plate (4) and the central tube (8) is between 0.88 and 0.92 kg / m³, and the floating plate (4) is made of a super hydrophobic and oleophilic material; An oil delivery pipe (7) is connected in series with an oil delivery pump (6), the other end of the oil delivery pipe (7) is connected with a degradation box (2), the degradation box (2) is a square cavity container, the interface between the oil delivery pipe (7) and the degradation box (2) is located at the upper part of the side of the degradation box (2), and an LED light board (12) is arranged in the degradation box (2), and the LED light board (12) is located at the top of the degradation box (2).

2. A waste mineral oil recycling system according to claim 1, characterized in that: A surrounding plate (403) is provided on the upper edge of the floating plate (4), and the surrounding plate (403) extends upward along the maximum diameter of the upper end surface of the floating plate (4). The height of the surrounding plate (403) is not greater than 5 mm. A layer of capillary material (404) is welded from the middle of the outer circle of the floating plate (4) to the position beyond the surrounding plate (403), and the capillary material (404) is made of a super hydrophobic and oleophilic material.

3. A waste mineral oil recycling system according to claim 1, characterized in that: Ultrasonic vibrators (20) are installed on the inner wall of the cavity (401). The ultrasonic vibrators (20) are evenly distributed along the circumference of the inner wall of the cavity (401). The ultrasonic vibrators (20) are arranged on the lower half of the inner wall of the cavity (401).

4. A waste mineral oil recycling system according to claim 1, characterized in that: The degradation box (2) is provided with a mirror reflector (13) at the lower side of the LED light board (12), the mirror reflector (13) is located at the lower side of the inlet of the oil pipeline (7), the mirror reflector (13) separates the degradation box (2) laterally, and a gap is left between the front end and the rear end of the mirror reflector (13) and the inner wall of the degradation box (2), wherein a flow pipe (14) is provided between the mirror reflector (13) and the inner wall of the degradation box (2), and an electric heating pipe (15) is installed in the flow pipe (14).

5. A waste mineral oil recycling system according to claim 1, characterized in that: A vent pipe A (16) is provided on the top of the degradation box (2), and high-efficiency activated carbon (21) is filled in the vent pipe A (16). A feeding pipe (17) is provided on the top of the degradation box (2), and a sealing cap (18) is provided on the upper part of the feeding pipe (17). A vent pipe B (19) is provided on the top of the separation tank (1).

6. A waste mineral oil recycling system according to claim 1, characterized in that: A valve seat tube (9) is provided in the inner hole of the center tube (8), the upper part of the valve seat tube (9) is a conical bell mouth, a float (10) is provided in the valve seat tube (9), a guide column is provided at the lower part of the float (10), the guide column extends into the valve seat tube (9), the lower part of the float (10) is a conical ring surface, the conical ring surface of the float (10) is connected to the conical hole of the valve seat tube (9) through a conical surface seal, and a pressure sensor (11) is installed at the front end of the oil delivery pump (6) of the oil delivery pipe (7).

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