Efficient separation system for refining waste mineral oil

Abstract

The invention belongs to the technical field of separation, and particularly relates to an efficient separation system for refining waste mineral oil, which comprises a storage module, a refining module, a sedimentation module and a pressure feed rapid separation module, the pressure feed rapid separation module continuously pumps and conveys low-solid-content waste mineral oil to the refining module in a reciprocating extrusion filtration mode, and the high-solid-content sedimentation conveying module is connected with the pressure feed rapid separation module in parallel; circulation of liquid suction and liquid pushing is achieved in a reciprocating pumping mode. And meanwhile, the pressure feeding rapid separation module is connected with the high-solid-content sedimentation conveying module in parallel, and high-solid-content waste mineral oil generated in a return residual area and a pushing residual area in reciprocating pushing is shunted. And a cross operation form enables a refining production line to flow smoothly, so that the continuous processing requirement is met. And the saturation burden of the filter screen and the friction burden of the piston plate are reduced. The replacement frequency of the filter screen is reduced, and the service life of the piston plate is prolonged.

Description

Technical Field

[0001] The present invention belongs to the technical field of separation, and particularly relates to an efficient separation system for refining waste mineral oil. Background Art

[0002] In addition to containing many particulate impurities, waste mineral oil also contains alkanes, unsaturated hydrocarbons, and non-hydrocarbon compounds. There are various treatment methods for waste mineral oil, but separating particulate impurities from waste mineral oil is essential.

[0003] Separating solid impurities can be applied in two aspects: pretreatment and secondary treatment. Pretreatment is to filter primary impurities such as asphalt, fats, and metal debris in waste mineral oil. For secondary treatment, for example, by using the click reaction of mercapto group and olefin, the mercapto group (-SH) and olefin are joined together to synthesize a macromolecular material that sinks to the bottom of the oil to separate the target substance.

[0004] However, the problem with filtering waste mineral oil is the viscosity of the waste mineral oil itself. When the viscosity of waste mineral oil is high, the liquid-solid stratification needs to be collected through a precipitation process when separating particles, and the precipitation process is slow.

[0005] If the target substance of waste mineral oil is separated by pressurization, the waste mineral oil is pushed through the filtering structure quickly by pressure to obtain the waste mineral oil separation liquid quickly, and the waste mineral oil separation liquid can be used for subsequent processes. However, pressure pushing causes particulate matter to accumulate on the surface of the filter screen. Under the liquid pressurization state of the filter screen, the filtration flow rate per unit time surges, the filtration saturation speed increases, and the filter screen needs to be replaced frequently, which is not suitable for continuous processing. Summary of the Invention

[0006] The present invention provides an efficient separation system for refining waste mineral oil, which has the characteristics of forming a suction and pushing cycle by reciprocating pushing, secondarily transporting the high-solid-content waste mineral oil at both ends of the reciprocating stroke, diverting the process, reducing the saturation speed of the filter screen, and enabling continuous processing of the treatment production line.

[0007] The present invention provides the following technical solutions: including a storage module, a refining module, a sedimentation module, and further including a pressure-pumping rapid separation module, the pressure-pumping rapid separation module continuously sucks and transports low-solid-content waste mineral oil to the refining module in a form of reciprocating squeezing filtration; It further includes a high-solid-content sedimentation and transportation module, the high-solid-content sedimentation and transportation module is connected in parallel with the pressure-pumping rapid separation module, the pressure-pumping rapid separation module pushes the high-solid-content waste mineral oil at both ends of the reciprocating stroke into the high-solid-content sedimentation and transportation module, and the high-solid-content sedimentation and transportation module pushes the high-solid-content waste mineral oil to the sedimentation module.

[0008] As a further solution of the present invention: The pressure-feeding and rapid separation module includes a first piston tube, a piston plate, and a filter screen. The piston plate divides the inside of the first piston tube into a temporary storage chamber and a pushing chamber. When the temporary storage chamber is in an extended state, the substances in the storage module enter the inside of the temporary storage chamber through a one-way liquid inlet pipe. When the temporary storage chamber is in a contracted state, the substances in the temporary storage chamber pass through the piston plate and enter the inside of the pushing chamber. When the pushing chamber is in a contracted state, the substances in the pushing chamber pass through the filter screen and enter the refining module.

[0009] As a further solution of the present invention: The high-solid content sedimentation and transportation module includes a columnar piston and a second piston tube. The first piston tube is divided into a return residue area, a pushing area, and a pushing residue area according to its length. The second piston tube is connected to the first piston tube through a return suction pipeline and a forward stroke suction pipeline. There are a return anti-suction line and a forward stroke anti-suction line inside the second piston tube. One end of the return suction pipeline is connected to the return residue area, and the other end of the return suction pipeline is located on the liquid outlet side of the return anti-suction line. One end of the forward stroke suction pipeline is connected to the pushing residue area, and the other end of the forward stroke suction pipeline is located on the liquid outlet side of the forward stroke anti-suction line.

[0010] As a further solution of the present invention: One-way valves are provided inside both the return suction pipeline and the forward stroke suction pipeline. When the piston plate moves inside the return residue area and the second piston tube moves at one end of the return anti-suction line away from the liquid outlet side, when the acting forces applied by the piston plate and the second piston tube to the one-way valve are in the same direction, the one-way valve opens.

[0011] As a further solution of the present invention: When the piston plate moves inside the pushing residue area and the columnar piston moves at one end of the forward stroke anti-suction line away from the liquid outlet side, when the acting forces applied by the piston plate and the columnar piston to the one-way valve are in the same direction, the one-way valve opens.

[0012] As a further solution of the present invention: A plurality of flap conveying ports are provided on the surface of the piston plate. The flap conveying ports open when the temporary storage chamber is in a compressed state and close when the pushing chamber is in a compressed state.

[0013] As a further solution of the present invention: When the columnar piston slides to the forward stroke anti-suction line, the columnar piston closes the return suction pipeline.

[0014] As a further solution of the present invention: Flaps are provided at the ends of both the first piston tube and the second piston tube, and the rotation direction of the flaps is counterclockwise.

[0015] The beneficial effects of the present invention are: By means of reciprocating pumping, the cycle of liquid suction and liquid pushing is realized. At the same time, the pressure-pumping rapid separation module and the high-solid-content sedimentation and transportation module are connected in parallel, and the high-solid-content waste mineral oil generated in the return residual area and the pushing residual area during reciprocating pushing is shunted. The pressure-pumping rapid separation module quickly feeds an amount that meets the processing capacity of the refining module, and the remaining high-solid-content waste mineral oil is processed through the sedimentation module. The form of cross-operation enables the smooth flow of the refining production line and meets the requirements of continuous processing. It reduces the saturation burden of the filter screen and the friction burden of the piston plate. The number of filter screen replacements is reduced, and the service life of the piston plate is increased.

[0016] Parts not involved in this device are the same as or can be realized by existing technologies. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the overall schematic diagram of the present invention; Figure 2 is the disassembled schematic diagram of the pressure-pumping rapid separation module and the high-solid-content sedimentation and transportation module in the present invention; Figure 3 is the schematic diagram of the liquid suction process of the temporary storage cavity in the present invention; Figure 4 is the schematic diagram of the liquid transportation process between the temporary storage cavity and the pushing cavity in the present invention; Figure 5 is the schematic diagram of the transportation process between the return residual area and the high-solid-content sedimentation and transportation module in the present invention; Figure 6 is the schematic diagram of the transportation process between the pushing residual area and the high-solid-content sedimentation and transportation module in the present invention; In the figure: 100, return residual area; 200, pushing area; 300, pushing residual area; 400, return reverse suction line; 500, forward stroke reverse suction line; 1, pressure-pumping rapid separation module; 11, first piston tube; 12, piston plate; 13, flap conveying port; 14, filter screen; 2, high-solid-content sedimentation and transportation module; 21, columnar piston; 22, second piston tube; 23, return suction pipeline; 24, forward stroke suction pipeline; 3, storage module; 31, one-way liquid inlet pipe; 4, refining module; 5, sedimentation module; 6, temporary storage cavity; 7, pushing cavity. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] Embodiment 1: Please refer to Figures 1 - 6 : In this embodiment, in order to solve the problem of filtration efficiency caused by the viscosity of waste mineral oil, the following improvements are made: In this embodiment, it includes a storage module 3, a refining module 4, a sedimentation module 5, and also includes a pressure-feeding and rapid separation module 1. The pressure-feeding and rapid separation module 1 continuously sucks and transports low-solid-content waste mineral oil to the refining module 4 in the form of reciprocating squeezing filtration. The pressure-feeding and rapid separation module 1 includes a first piston tube 11, a piston plate 12, and a filter screen 14. The piston plate 12 divides the inside of the first piston tube 11 into a temporary storage chamber 6 and a pushing chamber 7. When the temporary storage chamber 6 is in an extended state, the substances in the storage module 3 enter the inside of the temporary storage chamber 6 through the one-way liquid inlet pipe 31. When the temporary storage chamber 6 is in a contracted state, the substances in the temporary storage chamber 6 pass through the piston plate 12 and enter the inside of the pushing chamber 7. When the pushing chamber 7 is in a contracted state, the substances in the pushing chamber 7 pass through the filter screen 14 and enter the inside of the refining module 4.

[0019] In this embodiment, the improvement principle is as follows: Pushing simplification: Please refer to Figure 1 , after the original waste mineral oil is obtained, it is stored inside the storage module 3, and this technical solution can be used immediately after obtaining the original waste mineral oil. The original waste mineral oil first enters the pressure-feeding and rapid separation module 1. The steps for entering the pressure-feeding and rapid separation module 1 are as follows: S1: Please refer to Figure 3 : During the process of the piston plate 12 pushing towards the liquid outlet end, the temporary storage chamber 6 is in an expanded state. Due to the one-way transportation effect of the one-way liquid inlet pipe 31 on the liquid inside the storage module 3, the liquid inside the storage module 3 is sucked into the temporary storage chamber 6.

[0020] S2: Please refer to Figure 4 : During the process of the piston plate 12 moving away from the liquid outlet end, the temporary storage chamber 6 is in a compressed state. The liquid pressure is applied at the piston plate 12, and the flap conveying port 13 is opened. The temporary storage chamber 6 and the pushing chamber 7 are connected, and the liquid inside the temporary storage chamber 6 enters the inside of the pushing chamber 7.

[0021] S3: Please refer to Figure 6 : The piston plate 12 moves towards the liquid outlet end, pushing the liquid inside the pushing chamber 7 towards the filter screen 14. The pushing chamber 7 is compressed, and the liquid inside the pushing chamber 7 quickly passes through the filter screen 14 under the influence of pressure and enters the refining module 4. Similarly, the temporary storage chamber 6 is in an expanded state, and the temporary storage chamber 6 continues to suck the original waste mineral oil from the storage module 3.

[0022] This method uses the form of reciprocating pumping to realize the cycle of liquid suction and liquid pushing. The pushing structure of the piston plate 12 can select a hydraulic cylinder, and the thrust of the hydraulic cylinder is used to drive the waste mineral oil to quickly pass through the filter screen 14. The liquid passing through the filter screen 14 can enter the refining module 4 for refining.

[0023] In this way, impurities will accumulate at the return residual area 100 and the pushing residual area 300. The high-solid-content waste mineral oil in the pushing residual area 300 will cause the filter screen 14 to become saturated quickly. The high-solid-content waste mineral oil in the return residual area 100 will reduce the service life of the sliding seal of the piston plate 12.

[0024] The reasons are as follows: The piston plate 12 is slidably connected to the inner wall of the first piston tube 11. The flap conveying port 13 cannot be arranged on the circumferential side of the piston plate 12. There is a spacing between the flap conveying port 13 and the inner wall of the first piston tube 11. The waste mineral oil inside the first piston tube 11 is affected by gravity, and the amount of impurities at the bottom of the first piston tube 11 is greater than that at the top of the first piston tube 11. After the temporary storage chamber 6 is compressed, the impurity mass at the bottom is scraped and accumulated by the piston plate 12, resulting in an increase in the solid content of the mineral oil in the return residual area 100. When the pushing chamber 7 is compressed, the solid content is blocked by the filter screen 14 in the pushing residual area 300, and the solid content of the mineral oil in the pushing residual area 300 increases.

[0025] In order to solve the accumulation problems in the return residual area 100 and the pushing residual area 300, the following improvements are made: The content of this improvement: It also includes a high-solid-content sedimentation and conveying module 2. The high-solid-content sedimentation and conveying module 2 is connected in parallel with the pressure-feeding and rapid separation module 1. The pressure-feeding and rapid separation module 1 pushes the high-solid-content waste mineral oil at both ends of the reciprocating stroke into the high-solid-content sedimentation and conveying module 2, and the high-solid-content sedimentation and conveying module 2 pushes the high-solid-content waste mineral oil to the sedimentation module 5.

[0026] Improvement principle: The pressure-feeding and rapid separation module 1 and the high-solid-content sedimentation and conveying module 2 are connected in parallel. The piston plate 12 pushes the pushing chamber 7 to be compressed into the area of the pushing residual area 300, and the high-solid-content mineral oil in the pushing residual area 300 enters the high-solid-content sedimentation and conveying module 2 through the forward stroke suction pipeline 24. Similarly, when the temporary storage chamber 6 is compressed, the waste liquid in the return residual area 100 enters the high-solid-content sedimentation and conveying module 2 through the return stroke suction pipeline 23.

[0027] Design advantages: The waste mineral oil in the reciprocating pushing process is divided into two groups. The first group of waste mineral oil enters the refining module 4 for refining after being filtered by the filter screen 14. After the pushing chamber 7 is compressed to the pushing residue area 300 each time, the subsequent conveying path of the waste mineral oil with high solid content changes. The waste mineral oil with high solid content flows into the high-solid-content sedimentation and conveying module 2 and is conveyed to the sedimentation module 5 through the high-solid-content sedimentation and conveying module 2 for sedimentation and other treatments to remove the solid content. The refining module 4 is also limited by the processing capacity during the refining process. The pressure-feeding and rapid separation module 1 quickly feeds an amount to meet the processing capacity of the refining module 4, and the remaining waste mineral oil with high solid content is processed by the sedimentation module 5. The form of cross-operation makes the refining production line flow smoothly and meets the requirements of continuous processing. Moreover, the conveying direction of the waste mineral oil with high solid content in the pushing residue area 300 is transferred to the high-solid-content sedimentation and conveying module 2, reducing the saturation burden of the filter screen 14 and the friction burden of the piston plate 12. The replacement frequency of the filter screen 14 is reduced, and the service life of the piston plate 12 is increased.

[0028] Embodiment 2: Embodiment 2 is based on Embodiment 1. For the structural improvement to implement the above design content, the improvement aim is to improve the conveying efficiency and achieve the step connection of Embodiment 1: In this embodiment: The improvement content includes: The high-solid-content sedimentation and conveying module 2 includes a columnar piston 21 and a second piston tube 22. The first piston tube 11 is divided into a return residue area 100, a pushing area 200, and a pushing residue area 300 according to its length. The second piston tube 22 is connected to the first piston tube 11 through a return suction pipeline 23 and a forward stroke suction pipeline 24. The second piston tube 22 has a return anti-suction line 400 and a forward stroke anti-suction line 500. One end of the return suction pipeline 23 is connected to the return residue area 100, and the other end of the return suction pipeline 23 is located on the liquid outlet side of the return anti-suction line 400. One end of the forward stroke suction pipeline 24 is connected to the pushing residue area 300, and the other end of the forward stroke suction pipeline 24 is located on the liquid outlet side of the forward stroke anti-suction line 500.

[0029] One-way valves are arranged inside both the return suction pipeline 23 and the forward stroke suction pipeline 24. When the piston plate 12 moves in the return residue area 100 and the second piston tube 22 moves at one end of the return anti-suction line 400 away from the liquid outlet side, and the acting forces applied by the piston plate 12 and the second piston tube 22 to the one-way valve are in the same direction, the one-way valve opens.

[0030] In this embodiment: When the pushing residue area 300 is in the compression stage, the columnar piston 21 needs to control the area in the second piston tube 22 connected to the pushing residue area 300 to be in the expansion stage. For easy understanding, please refer to Figure 2 、 Figure 6。The columnar piston 21 is located at the push - stroke anti - suction line 500. The columnar piston 21 moves in the direction away from the liquid outlet end, pushing the residual area 300 to be compressed. When the liquid outlet end of the high - solid - content sedimentation and transportation module 2 is closed, the movement of the second piston tube 22 shows a suction force on the push - stroke suction pipeline 24. The residual area 300 shows a thrust force on the push - stroke suction pipeline 24. When the acting forces exerted by the piston plate 12 and the second piston tube 22 on the one - way valve are in the same direction, the one - way valve opens.

[0031] Design reason: The simplest one - way valve consists of a spring, a plug, and a channel. The plug is driven by the acting force in the outflow direction to cause elastic deformation of the spring, and the plug separates from the channel to achieve connection. When the plug receives an acting force opposite to the outflow direction, the plug fits tightly with the channel to achieve sealing. Therefore, only by adjusting the elastic coefficient of the spring, the acting forces exerted by the high - solid - content sedimentation and transportation module 2 and the pressure - sending and rapid - separation module 1 independently on the one - way valves of the return - stroke suction pipeline 23 and the push - stroke suction pipeline 24 cannot drive elastic deformation.

[0032] Please refer to Figure 5 C - Figure 6 A, if the push chamber 7 is in a compressed state and has not reached the area of the residual area 300 for pushing, the acting force exerted by the push chamber 7 on the one - way valve of the push - stroke suction pipeline 24 is in the same direction as the outflow direction of the one - way valve. Then, some waste mineral oil in the push chamber 7 will enter the high - solid - content sedimentation and transportation module 2 through the push - stroke suction pipeline 24. The amount of waste mineral oil passing through the filter net 14 in the push chamber 7 will decrease. When it has not reached the residual area 300 for pushing, the solid content of the waste mineral oil in the residual area 300 for pushing is not high, so this step is meaningless.

[0033] Similarly: Please refer to Figure 4 B, Figure 4 After the temporary storage chamber 6 in B is compressed and has not been compressed to the return - residual area 100, the pressure generated by the compression of the temporary storage chamber 6 needs to be applied at the flap conveying port 13 to ensure the connection between the temporary storage chamber 6 and the push chamber 7. Since the piston plate 12 moves within the residual area 300 for pushing while the columnar piston 21 moves at the end of the push - stroke anti - suction line 500 away from the liquid - outlet side, when the acting forces exerted by the piston plate 12 and the columnar piston 21 on the one - way valve are in the same direction, the one - way valve opens. Therefore, if the movement direction of the columnar piston 21 is not the same as that of the piston plate 12, the return - stroke suction pipeline 23 cannot be opened, thus realizing the connection between the temporary storage chamber 6 and the push chamber 7.

[0034] The above explains the core content of the connection of steps in continuous processing. The following are the usage steps for connection: S1: Please refer to Figure 3A. In the initial stage, the piston plate 12 and the columnar piston 21 move in the same direction, and the moving direction is the liquid outlet end direction. The columnar piston 21 exerts a reverse-flow direction force on the return suction pipe 23, and the piston plate 12 exerts a flow direction force on the return suction pipe 23. The one-way valve spring of the return suction pipe 23 cannot be activated, and the return suction pipe 23 is closed. S2: Please refer to Figure 3 B- Figure 3 C: The columnar piston 21 stops at the forward stroke anti-suction line 500, and the piston plate 12 pushes the push chamber 7 to shrink to the push residual area 300. The columnar piston 21 moves in the reset direction, and the push chamber 7 continues to be compressed. The columnar piston 21 shows a suction force on the forward stroke suction pipe 24, and the push chamber 7 shows a thrust force on the forward stroke suction pipe 24. The suction force and the thrust force are in the same direction, and the one-way valve in the forward stroke suction pipe 24 opens. The air in the push chamber 7 is injected into the second piston tube 22. S3: Please refer to Figure 4 A- Figure 4 C: The piston plate 12 drives the temporary storage chamber 6 to shrink, and the push chamber 7 expands. The moving direction of the columnar piston 21 is away from the liquid outlet end direction. The columnar piston 21 stops at the return stroke anti-suction line 400, and the temporary storage chamber 6 is compressed to the return residual area 100. S4: Please refer to Figure 5 A- Figure 5 C: The moving direction of the columnar piston 21 is away from the liquid outlet end direction and continues to move. The piston plate 12 drives the temporary storage chamber 6 to shrink again. The columnar piston 21 shows a suction force on the one-way valve of the return suction pipe 23. When the return residual area 100 is compressed, although the flap conveying port 13 is in the open state, the aperture of the flap conveying port 13 is limited, and the return residual area 100 still shows a thrust force on the one-way valve of the return suction pipe 23 when it is compressed. The one-way valve of the return suction pipe 23 opens, and the high-solid-content waste mineral oil in the return residual area 100 enters the second piston tube 22 through the return suction pipe 23.

[0035] S5: Repeat step S1. When reaching S2, the high-solid-content mineral oil in the push chamber 7 is injected into the second piston tube 22, and the columnar piston 21 pushes the high-solid-content mineral oil to move towards the liquid outlet end in the second piston tube 22.

[0036] Supplementary description: A plurality of flap conveying ports 13 are arranged on the surface of the piston plate 12. The flap conveying ports 13 are opened when the temporary storage chamber 6 is in the compressed state, and the flap conveying ports 13 are closed when the push chamber 7 is in the compressed state.

[0037] The flap is arranged on the side of the piston plate 12 close to the push chamber 7, and the flap cannot rotate clockwise. When the push chamber 7 is compressed, the flap fits tightly with the piston plate 12. When the temporary storage chamber 6 is compressed, the acting force direction changes and the flap opens, and the liquid inside the temporary storage chamber 6 enters the push chamber 7.

[0038] Further, when the columnar piston 21 slides to the return suction line 500, the columnar piston 21 closes the return suction pipeline 23. When the columnar piston 21 closes the port of the return suction pipeline 23, any reduction or expansion of the internal temporary cavity 6 and the push cavity 7 in the pressure feeding and quick separation module 1 will not affect the opening of the return suction pipeline 23, which can simplify the control logic.

[0039] Further, flap plates are provided at the ends of the first piston tube 11 and the second piston tube 22, and the rotation direction of the flap plates is counterclockwise.

[0040] The reason for the setting is that the flap plate provided on the first piston tube 11 can push up the flap plate during the oil pushing process in the oil production stage, preventing the mineral oil from being exposed to the outside and adhering to dust.

[0041] The reason for the flap plate provided on the piston plate 12 is that during the movement of the columnar piston 21 away from the liquid outlet end, a negative pressure is generated inside the second piston tube 22. The negative pressure acts as a suction force on the return suction pipeline 23 and the forward suction pipeline 24. The suction force, combined with the thrust of the temporary cavity 6 and the push cavity 7, drives the one-way valves of the return suction pipeline 23 and the forward suction pipeline 24 to open.

[0042] This embodiment can use the form of differential speed control to control the piston plate 12 and the columnar piston 21 at different speeds, so as to achieve the above steps. The design of the differential speed can reduce the waiting period of the columnar piston 21 at the return suction line 400 and the forward suction line 500, and further improve the continuity.

Claims

1. An efficient separation system for waste mineral oil refining, comprising a storage module (3), a refining module (4), and a sedimentation module (5), characterized in that: It also includes a pressure-feeding and quick-separation module (1), which continuously sucks and transports low-solid-content waste mineral oil to the refining module (4) in a reciprocating squeezing and filtering manner; It also includes a high-solid-content sedimentation and transportation module (2), which is connected in parallel with the pressure-feeding and quick-separation module (1). The pressure-feeding and quick-separation module (1) pushes the high-solid-content waste mineral oil at both ends of the reciprocating stroke into the high-solid-content sedimentation and transportation module (2), and the high-solid-content sedimentation and transportation module (2) pushes the high-solid-content waste mineral oil to the sedimentation module (5).

2. The high-efficiency separation system for waste mineral oil refining according to claim 1, wherein: The pressure-feeding and quick-separation module (1) includes a first piston tube (11), a piston plate (12), and a filter screen (14). The piston plate (12) divides the inside of the first piston tube (11) into a temporary storage chamber (6) and a pushing chamber (7). When the temporary storage chamber (6) is in an extended state, the substance in the storage module (3) enters the inside of the temporary storage chamber (6) through a one-way liquid inlet pipe (31). When the temporary storage chamber (6) is in a contracted state, the substance in the temporary storage chamber (6) passes through the piston plate (12) and enters the inside of the pushing chamber (7). When the pushing chamber (7) is in a contracted state, the substance in the pushing chamber (7) passes through the filter screen (14) and enters the inside of the refining module (4).

3. The high-efficiency separation system for waste mineral oil refining according to claim 2, wherein: The high-solid-content sedimentation and transportation module (2) includes a columnar piston (21) and a second piston tube (22). The first piston tube (11) is divided into a return residual area (100), a pushing area (200), and a pushing residual area (300) according to its length. The second piston tube (22) is connected to the first piston tube (11) through a return suction pipeline (23) and a forward stroke suction pipeline (24). There is a return anti-suction line (400) and a forward stroke anti-suction line (500) inside the second piston tube (22). One end of the return suction pipeline (23) is connected to the return residual area (100), and the other end of the return suction pipeline (23) is located on the liquid outlet side of the return anti-suction line (400). One end of the forward stroke suction pipeline (24) is connected to the pushing residual area (300), and the other end of the forward stroke suction pipeline (24) is located on the liquid outlet side of the forward stroke anti-suction line (500).

4. An efficient separation system for waste mineral oil refining according to claim 3, characterized in that: One-way valves are provided inside both the return suction pipeline (23) and the forward stroke suction pipeline (24). When the piston plate (12) moves inside the return residual area (100) and at the same time the second piston tube (22) moves at one end of the return anti-suction line (400) away from the liquid outlet side, when the acting force directions applied by the piston plate (12) and the second piston tube (22) to the one-way valve are the same, the one-way valve opens.

5. An efficient separation system for waste mineral oil refining according to claim 4, wherein: When the piston plate (12) moves inside the pushing residual area (300) and at the same time the columnar piston (21) moves at one end of the forward stroke anti-suction line (500) away from the liquid outlet side, when the acting force directions applied by the piston plate (12) and the columnar piston (21) to the one-way valve are the same, the one-way valve opens.

6. The high-efficiency separation system for waste mineral oil refining according to claim 2, characterized in that: The surface of the piston plate (12) is provided with a plurality of flap conveying ports (13), and the flap conveying ports (13) are opened when the temporary storage cavity (6) is in a compressed state, and the flap conveying ports (13) are closed when the pushing cavity (7) is in a compressed state.

7. An efficient separation system for waste mineral oil refining according to claim 3, characterized in that: When the columnar piston (21) slides to the forward stroke anti-suction line (500), the columnar piston (21) closes the return suction pipeline (23).

8. An efficient separation system for waste mineral oil refining according to claim 3, characterized in that: Flaps are provided at the ends of the first piston tube (11) and the second piston tube (22), and the rotation direction of the flaps is counterclockwise.

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