Oil-water separation device for waste mineral oil

Abstract

The utility model relates to an oil-water separation device for waste mineral oil, which belongs to the technical field of waste mineral oil treatment and comprises a mixing box, a spoiler, a first floating plate and a first liquid level sensor are sequentially arranged in an inner cavity of the mixing box from bottom to top, the density of the first floating plate is between the density of oil and the density of water, and a first position sensor is arranged on the first floating plate. The oil-water interface height of the mixing box is monitored in real time; the standing box is located at one end of the mixing box, the bottom of an inner cavity of the standing box is communicated with the position, located below the spoiler, of the inner cavity of the mixing box through a first pipeline, and the standing box is used for pumping water below the spoiler to the bottom of the standing box; the oil storage tank is arranged at the other end part of the mixing tank; through the synergistic effect of the spoiler and the floating plate in the mixing box and in combination with secondary separation of the standing box, 5-6 hours required by traditional standing are shortened to about 2 hours, the treatment efficiency is greatly improved, and meanwhile, the occupied area of equipment is reduced.

Description

Technical Field

[0001] This utility model relates to the field of waste mineral oil treatment technology, and in particular to an oil-water separation device for waste mineral oil. Background Technology

[0002] Existing oil-water separation methods mainly employ two approaches:

[0003] One method involves allowing the mixture to stand for an extended period (usually 5-6 hours) so that the less dense oil sits on top and the denser water sits on the bottom. However, this method is time-consuming, requires a large area, and has the drawback of difficulty in separating the oil and water at the interface.

[0004] Another approach utilizes the oleophilic but hydrophobic properties of materials to capture and adsorb oil stains in the adsorption tank through continuous contact between these materials. For example, Chinese Patent No. CN211798972U discloses an oil-water separation device for waste mineral oil. However, this device has the following drawbacks: 1. It relies on the fixed rotation path of the oil-absorbing filter belt, and the adsorption efficiency is limited by the contact range between the filter belt and the mixture, resulting in incomplete adsorption; 2. As the oil-absorbing filter belt is rotating, the water content in the mixing tank will increase, leading to a decrease in adsorption efficiency and a reduction in the effective operating ratio of the oil-absorbing filter belt.

[0005] Therefore, we designed an oil-water separation device for waste mineral oil. Utility Model Content

[0006] In order to overcome the shortcomings of the prior art, this utility model discloses an oil-water separation device for waste mineral oil.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] An oil-water separation device for waste mineral oil, comprising:

[0009] The mixing tank has, from bottom to top, a baffle plate, a first floating plate with a density between that of oil and water, and a first liquid level sensor. The first floating plate is equipped with a first position sensor for real-time monitoring of the oil-water interface height in the mixing tank.

[0010] A settling tank is located at one end of the mixing tank. The bottom of its inner cavity is connected to the position of the inner cavity of the mixing tank below the baffle plate through a first pipeline, which is used to pump water below the baffle plate to the bottom of the settling tank.

[0011] An oil storage tank is located at the other end of the mixing tank;

[0012] The oil suction filter belt conveyor assembly includes a lifting frame, a drive structure, and a scraper assembly. The lifting frame is equipped with an oil suction filter belt. The drive structure adjusts the height of the lifting frame according to the signal of a first position sensor, so that the oil suction filter belt contacts the oil layer above the first floating plate, and the scraper assembly scrapes the adsorbed oil into the oil storage tank.

[0013] Furthermore, the mixing box is provided with vertical slide rails on both sides, and the lifting frame is provided with sliding beams on both sides that cooperate with the vertical slide rails;

[0014] The drive structure includes a rack located on the outside of the sliding beam, a drive gear meshing with the rack, and a servo motor that drives the drive gear to rotate.

[0015] Furthermore, the inner cavity of the settling box is provided with a second floating block, and above it is a liquid extraction pipe of an extraction device, used to extract the oil above the second floating block back to the mixing box.

[0016] The bottom of the settling box is equipped with a drain valve.

[0017] Furthermore, the lower section of the settling box is separated from the drain valve and the drain outlet of the first pipeline by a partition.

[0018] Furthermore, the second floating block is equipped with a second position sensor, and the inner cavity of the settling tank is equipped with a second liquid level sensor; the drain valve opens or closes to drain according to the signal from the second position sensor; the extraction device opens or closes to pump oil back into the mixing tank according to the signal from the second position sensor.

[0019] Furthermore, the baffle is an inclined perforated plate used to prevent the liquid below the baffle from being disturbed.

[0020] Furthermore, the scraper assembly includes a scraper bracket and an inclined elastic scraper, which scrapes the adsorbed oil into the oil storage tank by squeezing the oil suction filter belt.

[0021] Furthermore, the oil-absorbing filter belt is a flexible strip structure made of oleophilic and hydrophobic material, and its surface is provided with micropores or porous structures to enhance adsorption efficiency.

[0022] Compared with the prior art, the beneficial effects of this utility model are:

[0023] 1. Significantly shorten separation time and improve processing efficiency: Through the synergistic effect of the baffles and floating plates in the mixing tank, combined with the secondary separation in the settling tank, the traditional settling time of 5-6 hours is shortened to about 2 hours, greatly improving processing efficiency and reducing the equipment footprint.

[0024] 2. Optimize adsorption efficiency and achieve precise oil layer adsorption: The oil suction filter belt transmission component uses the first position sensor to provide real-time feedback on the oil-water interface height, driving the structure to dynamically adjust the position of the oil suction filter belt, ensuring that the filter belt is always in contact with the oil layer, overcoming the defect of limited contact range of traditional fixed-path filter belts, and improving the adsorption efficiency of the filter belt.

[0025] 3. Maintain a stable operating ratio and extend the effective operating cycle of the equipment: The settling tank and mixing tank are linked. The water accumulated at the bottom of the mixing tank is promptly removed through the first pipeline, and the oil is returned by the second floating block in the settling tank and the extraction equipment. This avoids the decrease in adsorption efficiency caused by excessive water content in the mixing tank and ensures that the effective operating ratio of the oil suction filter belt remains stable in the long term. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of this utility model;

[0027] Figure 2 This is a schematic diagram illustrating the principle of this utility model;

[0028] Figure 3 for Figure 2 Enlarged view of part I in the image;

[0029] Figure 4 This is a schematic diagram of the structure of the oil suction filter belt transmission assembly in this utility model;

[0030] Figure 5 for Figure 4 Enlarged view of part II in the image;

[0031] Figure 6 This is a flowchart of the control system of this utility model.

[0032] In the diagram: 1. Mixing tank; 11. Baffle plate; 12. First floating plate; 13. First liquid level sensor; 14. First position sensor; 15. Vertical slide rail; 2. Settling tank; 21. Second floating block; 22. Drain valve; 23. Baffle plate; 24. Second position sensor; 25. Second liquid level sensor; 3. First pipeline; 4. Oil storage tank; 5. Oil suction filter belt transmission assembly; 51. Lifting frame; 52. Drive structure; 521. Rack; 522. Drive gear; 523. Servo motor; 53. Scraper assembly; 531. Scraper bracket; 532. Elastic scraper; 54. Oil suction filter belt; 55. Sliding beam; 6. Extraction equipment; 61. Extraction pipe. Detailed Implementation

[0033] The present invention will be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. In the description of the present invention, it should be understood that if terms such as "upper", "lower", "front", "rear", "left", "right" indicate orientation or positional relationship, they are only corresponding to the drawings of this application for the convenience of describing the present invention. It should be understood that if terms such as "end", "side", "end portion", "side part", "lateral", "longitudinal", etc. indicate orientation or positional relationship, they are only corresponding to the length and width of the corresponding component. That is, "end" indicates the head and tail area in the length direction of the corresponding component, and "side part" indicates the head and tail area in the width direction of the corresponding component. They are used for the convenience of describing the present invention and do not indicate or imply that the device or element referred to must have a specific orientation.

[0034] Example 1, in conjunction with Appendix Figure 1-6 An oil-water separation device for waste mineral oil, comprising:

[0035] The mixing tank 1 is provided with a baffle plate 11, a first floating plate 12 and a first liquid level sensor 13 arranged sequentially from bottom to top inside the cavity. The baffle plate 11 is at a certain distance from the bottom of the mixing tank 1.

[0036] The baffle 11 is an inclined perforated plate with an inclination angle of 30°, used to reduce the disturbance of the liquid at the bottom; that is, the liquid flow driven by the oil suction filter belt 54 during rotation will be blocked by the baffle 11, causing the liquid below the baffle 11 to become turbulent. As needed, multiple baffles 11 can be provided at intervals.

[0037] In one example, the aperture of the spoiler 11 is 2 mm.

[0038] The first floating plate 12 has a density between that of oil and water, and a first position sensor 14 is installed on its top to monitor the oil-water interface height in real time. Vertical slide rails 15 are provided on both sides of the mixing tank 1.

[0039] The settling tank 2 is connected to the bottom of the mixing tank 1 via the first pipe 3, and is used to receive water below the baffle 11. Specifically, the first pipe 3 has a water pump, which draws water located below the baffle 11 from the mixing tank 1 into the settling tank 2 by turning on the water pump.

[0040] The bottom of the inner cavity of the settling box 2 is provided with a partition 23 to separate the drain valve 22 from the drain outlet of the first pipeline 3, so as to prevent the water in the drain valve 22 area from being disturbed when the first pipeline 3 is in operation.

[0041] Oil suction filter belt conveyor assembly 5 includes:

[0042] Both sides of the lifting frame 51 are connected to the vertical slide rails 15 of the mixing box 1 via sliding beams 55.

[0043] In this embodiment, the lifting frame 51 has an L-shaped section located inside the mixing tank 1 and an extension section extending above the oil storage tank 4.

[0044] The drive structure 52 includes a rack 521, a drive gear 522, and a servo motor 523. The servo motor 523 adjusts the height of the oil suction filter belt 54 according to the signal from the first position sensor 14, so that it contacts the oil layer. Specifically, the rack 521 is located on the outside of the sliding beam 55 along its length, and the servo motor 523 is fixedly installed on the outer wall of the mixing tank 1. Its output shaft is provided with a drive gear 522 that meshes with the rack 521. That is, the servo motor 523 drives the drive gear 522 to rotate, thereby driving the rack 521 and the sliding beam 55 to rise or fall, so as to realize the function of adjusting the height of the lifting frame 51.

[0045] It should be noted that the oil suction filter belt 54 includes a belt body, a transmission guide roller and a drive motor. For the specific structural principle, please refer to Chinese patent with publication number CN211798972U. It will not be described in detail here.

[0046] In this embodiment, the oil-absorbing filter belt 54 is a flexible strip structure made of oleophilic and hydrophobic material, with micropores evenly distributed on the surface to improve adsorption efficiency.

[0047] Furthermore, the oil-absorbing filter belt 54 adopts a nano-level oleophilic coating, increasing the micropore density to 500 pores per square centimeter and improving the adsorption capacity by 30%.

[0048] The scraper assembly 53 includes a scraper bracket 531 and an elastic scraper 532. The upper end of the elastic scraper 532 abuts against the oil suction filter belt 54.

[0049] In this embodiment, the scraper bracket 531 is installed at the outer end of the extension section of the lifting frame 51.

[0050] The first liquid level sensor 13 and the second liquid level sensor 25 monitor the liquid levels in the mixing tank 1 and the settling tank 2, respectively. The signals are transmitted to the control system, which automatically adjusts the height of the oil suction filter belt 54 and the opening and closing of the drain valve 22.

[0051] Example 2: This example further optimizes the function of the settling box 2 based on Example 1.

[0052] A second floating block 21 is installed inside the settling tank 2, and a second position sensor 24 is installed on its top. When the second floating block 21 floats to a preset height, the extraction device 6 draws the upper layer of oil back to the mixing tank 1 through the extraction pipe 61.

[0053] The drain valve 22 automatically opens and closes according to the signal from the second position sensor 24: when the water level in the settling tank 2 reaches the threshold, the drain valve 22 opens to drain; when the oil layer is too thick, the back pumping operation is triggered.

[0054] Example 3, in conjunction with Appendix Figure 3 The difference between this embodiment and embodiment one is that the elastic scraper 532 includes an up-and-down inclined body 5321, the upper end of the body 5321 abuts against the oil suction filter belt 54, and the lower end is provided with an upward turning part 5322, which is connected to the scraper bracket 531 by a spring 5323.

[0055] It should be noted that in this embodiment, the body 5321 can be made of a rigid material.

[0056] In the example, the stiffness of spring 5323 is adjusted to 5 N / mm to ensure that it can fit tightly against the filter belt when scraping oil, while avoiding excessive wear.

[0057] Workflow:

[0058] Waste mineral oil is injected into mixing tank 1 and left to stand for about 2 hours. The oil and water are roughly separated. At this time, the equipment is started. The first floating plate 12 floats with the oil-water interface. The first position sensor 14 provides real-time feedback on the height. The drive structure 52 adjusts the height of the oil suction filter belt transmission assembly 5 according to the height feedback from the first position sensor 14. In essence, this is to adjust the distance of the oil suction filter belt 54 above the first floating plate 12. The belt of the oil suction filter belt 54 contacts the oil layer and adsorbs it. The adsorbed oil is scraped into the oil storage tank 4 by the scraper assembly 53.

[0059] As waste mineral oil is injected and the oil suction filter belt conveyor assembly 5 operates, the water content in the mixing tank 1 increases. At this time, the water pump of the first pipeline 3 is started, and the water at the bottom of the mixing tank 1 enters the settling tank 2 through the first pipeline 3 for secondary separation. In the settling tank 2, when the height of the second floating block 21 reported by the second position sensor 24 is high, it indicates that there is a lot of water in the settling tank 2, and drainage is triggered. When the height difference reported by the second position sensor 24 and the second liquid level sensor 25 is large, it indicates that there is a lot of oil in the settling tank 2, and back pumping is triggered to achieve efficient oil-water separation.

[0060] The parts of this utility model not described in detail are prior art. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that this utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the above embodiments should be regarded as exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, it is intended to include all changes that fall within the meaning and scope of the equivalents of the claims in this utility model, and no reference numerals in the claims should be regarded as limiting the content of the claims.

Claims

1. An oil-water separation device for waste mineral oil, characterized by: include: The mixing tank (1) has a baffle plate (11), a first floating plate (12) with a density between that of oil and water, and a first liquid level sensor (13) arranged sequentially from bottom to top in its inner cavity. The first floating plate (12) is equipped with a first position sensor for real-time monitoring of the oil-water interface height of the mixing tank (1). The settling tank (2) is located at one end of the mixing tank (1). The bottom of its inner cavity is connected to the position of the inner cavity of the mixing tank (1) below the baffle (11) through the first pipe (3) to pump the water below the baffle (11) to the bottom of the settling tank (2). An oil storage tank (4) is located at the other end of the mixing tank (1); The oil suction filter belt transmission assembly (5) includes a lifting frame (51), a drive structure (52), and a scraper assembly (53). The lifting frame (51) is provided with an oil suction filter belt (54). The drive structure (52) adjusts the height of the lifting frame (51) according to the signal of the first position sensor, so that the oil suction filter belt (54) contacts the oil layer above the first floating plate (12) and the oil adsorbed by the scraper assembly (53) is scraped off to the oil storage tank (4).

2. A device for separating oil from water in used mineral oil according to claim 1, characterized in that The mixing box (1) is provided with vertical slide rails (15) on both sides, and the lifting frame (51) is provided with sliding beams (55) on both sides that cooperate with the vertical slide rails (15). The drive structure (52) includes a rack (521) located outside the sliding beam (55), a drive gear (522) meshing with the rack (521), and a servo motor (523) that drives the drive gear (522) to rotate.

3. A device for separating oil from water in used mineral oil according to claim 1, characterized in that: The inner cavity of the settling box (2) is provided with a second floating block (21), and above it is a liquid extraction pipe (61) of the extraction device (6) for drawing the oil above the second floating block (21) back to the mixing box (1). The bottom of the settling box (2) is equipped with a drain valve (22).

4. A device for separating oil from water in used mineral oil according to claim 3, characterized in that: The lower section of the static box (2) is separated from the drain valve (22) and the drain outlet of the first pipeline (3) by a partition (23).

5. A device for separating oil from water in used mineral oil according to claim 3, characterized in that: The second floating block (21) is equipped with a second position sensor (24), and the inner cavity of the settling tank (2) is equipped with a second liquid level sensor; the drain valve (22) opens or closes to drain according to the signal of the second position sensor (24); the extraction device (6) opens or closes to pump oil back to the mixing tank (1) according to the signal of the second position sensor (24).

6. A device for separating oil from water in used mineral oil according to claim 1, characterized in that: The baffle (11) is an inclined perforated plate used to prevent the liquid below the baffle (11) from being disturbed.

7. A device for separating oil from water in used mineral oil according to claim 1, characterized in that: The scraper assembly (53) includes a scraper bracket (531) and an inclined elastic scraper (532), which scrapes the adsorbed oil into the oil storage tank (4) by squeezing the oil suction filter belt (54).

8. A device for separating oil from water in used mineral oil according to claim 1, characterized in that: The oil-absorbing filter belt (54) is a flexible strip structure made of oleophilic and hydrophobic materials, and its surface is provided with micropores or porous structures to enhance adsorption efficiency.

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