Waste mineral oil recycling device for purifying waste water in waste mineral oil

Abstract

The invention discloses a waste mineral oil recycling device for purifying waste water in waste mineral oil, and relates to the technical field of waste water treatment. An inflow pipe is installed on one side of the outer shell, an exhaust pipe is installed at the top of the outer shell, an oil discharge pipe is installed on the side, away from the inflow pipe, of the middle of the outer shell, and a water discharge pipe is installed at the bottom of the outer shell; a bottom supporting plate is installed at the bottom in the outer shell; a second separation part is installed at the top end of the bottom supporting plate; a first separating part is installed between the inner wall of the outer shell and one side of the partition plate, the inflow pipe is communicated with the first separating part, the oil discharging pipe is communicated with the second separating part, and the bottom of the water discharging pipe is connected with an oil separating pool. According to the invention, non-condensable gas in the top fraction is discharged in advance, the separator II is arranged to separate the oil-water mixture after turbulent flow is reduced, and wastewater is effectively separated and treated in cooperation with secondary separation of the oil separator.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, in particular to a waste mineral oil recycling device for purifying wastewater in waste mineral oil. Background Art

[0002] The composition of waste mineral oil is relatively complex, including light oil, medium oil, heavy oil, water and other components. During the recycling process, it needs to be fractionated through a distillation tower. The light oil generated by the cooler after distillation contains some non-condensable gases with low boiling points that cannot be liquefied, and also contains a small amount of water. The three form a mixture that is discharged from the cooler. Since the gas, oil and water in the mixture are mixed with each other, they need to be separated before the light oil in the waste mineral oil can be effectively recovered.

[0003] The patent specification with the announcement number CN108893136B discloses a method for treating waste oil generated by large steam blowing in delayed coking. During large steam blowing in delayed coking, the high-temperature oil and gas at the top of the coke tower are thrown into the lower part of the venting tower, and the high-temperature oil and gas are separated in the venting tower. The steam and light oil become the waste oil at the top of the tower, which is condensed by the heat exchanger at the top of the venting tower and then enters the venting tower separator tank. The heavy oil settles to become the waste oil at the bottom of the tower and flows out from the bottom of the tower. A part of the condensed waste oil at the top of the tower flows back to the upper part of the venting tower from the venting tower separator tank through the waste oil pump at the top of the venting tower, and the other part flows back to the water supply pipeline at the bottom of the coke tower from the venting tower separator tank through the waste oil pump at the top of the venting tower under the action of the reflux pipeline pump, and enters the coke tower for recycling; After distilling out the light oil, this technical solution re-distills part of the mixture containing water and non-condensable gas, and returns part to the heating furnace to separate and recover the mixture. The disadvantage of this technical solution is that after the secondary distillation and return to the heating furnace, the water in the mixture will not disappear, and will be regenerated again along with the distillate after being cooled. Therefore, the water in the light oil is never effectively separated and treated, and is harmful to the environment after being discharged, that is, the wastewater in the light oil mixture cannot be effectively separated and treated during the light oil recovery process. Summary of the invention

[0004] The purpose of the present invention is to provide a waste mineral oil recovery device for purifying waste water in waste mineral oil. The technical problem to be solved is as follows: the existing waste mineral oil recovery device cannot effectively separate and treat the waste water in the cooled light oil mixture during the process of recovering light oil.

[0005] The purpose of the present invention can be achieved by the following technical solutions: A waste mineral oil recycling device for purifying wastewater in waste mineral oil, comprising an outer shell, an inlet pipe is installed on one side of the outer shell, and an exhaust pipe is installed on the top, an oil discharge pipe is installed on the side of the middle part of the outer shell away from the inlet pipe, and a water discharge pipe is installed on the bottom, a bottom support plate is installed at the bottom of the inner part of the outer shell, a separator 2 is installed on the top of the bottom support plate, a partition is installed on one side of the top of the separator 2, a separator 1 is installed between the inner wall of the outer shell and one side of the partition, the inlet pipe is connected with the separator 1, the oil discharge pipe is connected with the separator 2, the separator 1 is used to separate non-condensable gas, the separator 2 is used to separate light oil and wastewater, and a grease trap is connected to the bottom of the water discharge pipe, and the grease trap is used to perform secondary separation on the wastewater.

[0006] As a further solution of the present invention: the outer shell includes a bottom bin, a top bin is arranged on the top of the bottom bin, and a plurality of bolts are evenly installed along the outer side of the ring between adjacent surfaces of the bottom bin and the top bin.

[0007] As a further solution of the present invention: the separator 1 includes a plurality of filter plates arranged evenly, the filter plates and the partition plate form an angle of 45-60 degrees in the horizontal direction, the bottom of the filter plate abuts against the bottom support plate, the curved side surface of the filter plate abuts against the inner wall of the shell, and the other side is fixedly connected to the partition plate.

[0008] As a further solution of the present invention: the bottom surface of the bottom support plate is evenly distributed with liquid holes, and a baffle is provided on the other side, and the baffle is inserted into the interior of the outer shell and close to one side of the inlet pipe.

[0009] As a further solution of the present invention: the second separator includes obliquely arranged settling tubes, each of the settling tubes is fixedly connected, the arc-shaped side surface of the second separator is in contact with the inner wall of the outer shell, the inner side of the top of the second separator is against the partition, the second separator is inserted into the interior of the outer shell, and the bottom surface is in contact with the top of the bottom support plate.

[0010] As a further solution of the present invention: the height of the partition is greater than the height of the top end of the separator one, the height of the separator two is lower than the height of the separator one, a side liquid port is arranged between the bottom end of the partition and the adjacent surface of the separator two, a water storage cavity is arranged at the bottom of the bottom bin, and the bottom of the water storage cavity is connected to the drain pipe.

[0011] As a further solution of the present invention: an observation column is installed on one side of the outer shell close to the oil drain pipe, the inner sides of both ends of the observation column are connected to the interior of the outer shell, the top of the observation column is higher than the second top of the separator, and the bottom is lower than the second top of the separator, and a window is arranged on the outside of the observation column.

[0012] As a further solution of the present invention: the installation height of the inlet pipe is higher than the top height of the second separator, the installation height of the oil drain pipe is located in the middle of the second separator, the outer shell is equipped with a water sight glass below the oil drain pipe, and the inlet pipe, exhaust pipe, oil drain pipe and the drain pipe are all equipped with control valves.

[0013] As a further solution of the present invention: the grease trap includes an grease trap chamber 1 connected to the drain pipe, one side of the grease trap chamber 1 is connected to the grease trap chamber 2 and the grease trap chamber 3 in sequence, a partition plate is provided in the middle of the grease trap chamber 1 and the grease trap chamber 2, a connecting pipe is installed between the bottoms of two adjacent grease trap chambers, an oil suction branch pipe is installed at the top of each grease trap chamber close to the drain pipe, and each of the oil suction branch pipes is shortened in sequence in the direction away from the drain pipe, and a water outlet pipe is installed at the top of the grease trap chamber 3 away from the drain pipe.

[0014] Beneficial effects of the present invention: 1. In the present invention, after the distillation tower fractionates the top fraction and cools it, the top fraction is injected into the outer shell through the inlet pipe. After entering the outer shell, the top fraction collides with the separator 1 and separates the non-condensable gas. The non-condensable gas is discharged from the top of the outer shell, and the remaining oil-water mixture in the top fraction contacts the separator 2 at the bottom of the separator 1. The separator 2 performs static separation on the oil-water mixture through the obliquely densely arranged settling pipes. The separated oil and water enter the bottom bin at the bottom of the outer shell through the liquid holes on one side of the bottom support plate, and are finally discharged respectively through the drain pipe and the oil drain pipe. That is, after entering the device, the top fraction composed of non-condensable gas, waste water and light oil is successively separated by the separator 1 and the separator 2. The components in the mixture are separated one by one, realizing the recovery of the top fraction after the mineral oil fractionation and the wastewater separation function; when the wastewater is separated, the top fraction is first intercepted and slowed down by the partition and the separation element 1 after entering the device, and the non-condensable gas that interferes with the oil-water separation with bubbles is first removed. Its technical advantage is that when the oil-water mixture enters the separation element 2 for settling, it is no longer disturbed by the high-speed fluid, and the settling tubes arranged obliquely are blocked from each other, so the oil-water mixture can quickly enter the oil-water stratification state after the non-condensable gas is removed, and is discharged one by one after the stratification is completed, that is, on the basis of realizing the separation function of the wastewater in the top fraction, the separation efficiency of the wastewater is accelerated; Furthermore, after the wastewater is discharged from the drain pipe, it is connected to the grease trap for secondary separation. Relying on the three oil-water separation chambers in the grease trap and the oil absorption branch pipes installed on the top of each oil-water separation chamber, the separated wastewater is subjected to secondary oil-water separation. In other words, in this case, after the wastewater is separated by the top fraction separation equipment, it is subjected to a more thorough secondary oil-water separation by the grease trap. With the help of the device and the grease trap, an integrated technical solution for separating wastewater in the top fraction is constructed, which aims to effectively solve the problem of water content in light oil in the recovery of waste mineral oil, thereby improving the quality of light oil recovery, and facilitating the subsequent unified and centralized treatment of wastewater to avoid omissions in the separation process and pollution to the environment.

[0015] 2. In the present invention, after the waste water is discharged from the oil separator, it is successively sent to the flotation tank and the biochemical tank for treatment. Since the amount of leakage in the separation process is very small, after being treated in the flotation tank and the biochemical tank, the degree of environmental pollution caused by the waste water generated in the waste mineral oil recycling process is reduced. In addition, during the recycling process of the waste mineral oil, the waste water discharged from the pretreatment process, the bottom discharge of the fractionation tower, the top fraction and the middle fraction are all concentrated in the wastewater treatment tank for treatment, thereby effectively reducing the pollution effect of the waste water generated during the recycling of the waste mineral oil on the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below in conjunction with the accompanying drawings.

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the partial internal structure of the present invention; Figure 3 The present invention Figure 2 A magnified detail of the center A; Figure 4 It is a side schematic diagram of the partial internal structure of the present invention; Figure 5 The present invention Figure 4 A magnified view of the detail at B in the middle; Figure 6 It is a bottom view of the partial internal structure of the present invention; Figure 7 It is a schematic diagram of the internal structure of the grease trap connected by the present invention; Figure 8 It is a flow chart of waste oil recovery and fractionation.

[0018] In the figure: 1. outer shell; 2. inlet pipe; 3. exhaust pipe; 4. oil drain pipe; 5. water drain pipe; 6. bottom support plate; 61. liquid hole; 62. baffle; 7. partition; 8. separator one; 81. filter plate; 9. separator two; 91. settling pipe; 10. oil separator; 11. bottom bin; 12. top bin; 13. bolt; 14. water storage chamber; 15. observation column; 16. window; 17. control valve; 18. oil separator chamber one; 19. oil separator chamber two; 20. oil separator chamber three; 21. partition plate; 22. connecting pipe; 23. oil suction branch pipe; 24. water outlet pipe; 25. water sight glass; 26. side liquid port. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] like Figure 8As shown, when waste mineral oil is recycled, it is first necessary to put the waste mineral oil into a pretreatment tank for treatment. The pretreatment tank includes a multi-stage oil storage tank and a filter tank. The waste oil undergoes multi-stage sedimentation and filtration to clean up the waste residue with larger particles. Then the waste oil is pumped into a preheating tank. The preheating tank heats the input waste oil to 80 degrees. The heated waste oil begins to stratify from an oil-water mixture. Then the waste water in the preheating tank is pumped out from the bottom and discharged into the wastewater treatment tank for treatment. The waste oil at the top is pumped out by the oil pump and transported to the heating tank. In the reactor, the heater is heated by the hot air furnace to heat the input waste oil to 350-400 degrees, and a homogeneous catalyst is added to the heater during heating to convert part of the macromolecular organic esters in the waste oil into simple esters, making its molecular structure closer to hydrocarbons, which is convenient for later fractionation. Then, this part of the waste oil is put into the fractionation tower, which is equipped with multiple layers of alternately arranged heat exchangers and fillers, and a catalyst layer for fractionation is set at the bottom of the tower. After fractionation, the light fraction with a lighter specific gravity is discharged from the top of the fractionation tower, and the medium fraction with a heavier specific gravity is discharged from the top of the fractionation tower. The fraction is discharged from the middle of the tower, and some fractions are discharged from the bottom of the tower, heated by the reboiler and re-entered into the distillation tower for distillation. After being discharged, they are cooled by coolers 1 and 2 for separation. The light fraction contains a large amount of non-condensable gas, light oil and a small amount of water. The non-condensable gas contains small molecular hydrocarbon gases with low boiling points, such as alkanes and olefins. Their boiling points are too low to be separated by conventional cooling liquefaction. After the waste oil sent to the distillation tower is heated at a high temperature of 300 to 400 degrees, the waste water contained in it also gasifies. In the example, the non-condensable gas and waste water vapor gather at the top of the tower during distillation and are transported to cooler 1 for liquefaction. The liquid oil-water mixture is transported to the top fraction separation equipment along with the non-condensable gas, which requires separation of waste water and non-condensable gas to obtain the final light oil. At the same time, the middle fraction will also discharge part of the waste water after separation by the middle fraction separation equipment. The waste water generated after the separation of the top fraction and the middle fraction is returned to the wastewater treatment pool for treatment, thereby completing the distillation recovery of the waste mineral oil and the purification of the waste water.

[0021] like Figures 1 to 8 As shown, a waste mineral oil recycling device for purifying waste water in waste mineral oil comprises an outer shell 1, an inlet pipe 2 is installed on one side of the outer shell 1, and an exhaust pipe 3 is installed on the top, an oil discharge pipe 4 is installed on the side of the middle part of the outer shell 1 away from the inlet pipe 2, and a water discharge pipe 5 is installed on the bottom, a bottom support plate 6 is installed at the bottom of the outer shell 1, a separator 2 9 is installed on the top of the bottom support plate 6, a partition 7 is installed on one side of the top of the separator 2 9, a separator 1 8 is installed between the inner wall of the outer shell 1 and one side of the partition 7, the inlet pipe 2 is connected to the separator 1 8, the oil discharge pipe 4 is connected to the separator 2 9, the separator 1 8 is used to separate non-condensable gas, the separator 2 9 is used to separate light oil and waste water, and the water discharge pipe 5 is connected to the oil separator 10; It should be noted that this device Figure 8 The top fraction separation equipment connected to the rear end of the cooler is used to process the light oil mixture after distillation, including separating the non-condensable gas and waste water therein, and finally obtaining the required light oil. The separated waste water is transported to the wastewater treatment pool for treatment, so as to realize the function of light oil recovery and wastewater cleaning.

[0022] like Figure 2 As shown, the outer shell 1 includes a bottom bin 11, a top bin 12 is arranged on the top of the bottom bin 11, and a plurality of bolts 13 are evenly installed along the outer side of the ring between the adjacent surfaces of the bottom bin 11 and the top bin 12; It should be noted that since separator 1 8 and separator 2 9 are installed inside the outer shell 1, and the performance of separator 1 8 and separator 2 9 will gradually decrease with the extension of the use time, they need to be replaced. By setting the outer shell 1 as a split structure fixed by bolts 13, the separator 1 8 and separator 2 9 can be inspected and replaced after a period of use, so as to maintain the performance of the device. Preferably, a rubber sealing gasket is installed between the connecting surfaces of the bottom bin 11 and the top bin 12. The sealing gasket is made of fluororubber that is resistant to high temperature and has strong gasoline tolerance to maintain the long-term sealing of the outer shell 1 as a whole. In addition, the side of the lower part of the outer shell 1 connected to the oil drain pipe 4 is an integrated sealing welding.

[0023] like Figure 2 and Figure 6 As shown, the separator 8 includes a plurality of filter plates 81 arranged evenly, each filter plate 81 forms an angle of 45-60 degrees with the partition plate 7 in the horizontal direction, the filter plate 81 is in the shape of a fiber mesh, the bottom of the filter plate 81 abuts against the bottom support plate 6, the curved side of the filter plate 81 abuts against the inner wall of the outer shell 1, and the other side is fixedly connected to the partition plate 7; The bottom support plate 6 has evenly arranged liquid holes 61 on one side close to the oil drain pipe 4, and a baffle 62 is provided on the other side. The partition plate 7 is inserted into the outer shell 1 and close to the side of the inlet pipe 2. It should be noted that after the inlet pipe 2 transports the mixture of non-condensable gas, gasoline-like light oil and part of the wastewater to the inside of the outer shell 1, the substances transported to the filter plate 81 are divided into the liquid phase of wastewater and light oil and the gas phase of non-condensable gas. After being transported to the inside of the outer shell 1, they collide with each filter plate 81 of the separator 8. Since each filter plate 81 is arranged obliquely and is in the shape of a fiber mesh, the non-condensable gas in the gas phase floats to the top of the inner part of the outer shell 1 when passing through, and the liquid phase is slowly dispersed and intercepted by fully contacting the filter plate 81, and at the same time falls along the filter plate 81 by its own gravity, and after reaching the bottom of the filter plate 81, it first contacts the separator 8. 29, and then contact the baffle 62 on the bottom surface of the bottom support plate 6, so as to ensure that the liquid phase can be conducted from the separation piece 18 to the separation piece 29, and sufficient time and space are reserved at the separation piece 29 for oil-water separation. The liquid phase after oil-water separation of the separation piece 29 passes through the liquid holes 61 on the other side, and the separated waste water is transferred to the bottom of the outer shell 1. After the gaseous non-condensable gas rises to the top of the outer shell 1, it is discharged from the exhaust pipe 3. The partition 7 is plugged on the side close to the inlet pipe 2, and its purpose is to prevent the non-condensable gas from being directly filled into the separation piece 29, thereby generating bubbles that affect the subsequent static sedimentation separation process of water and oil; In this process, the material made of the separation element 8 includes but is not limited to a polymer fiber mesh. When the oil needs to be further improved, such as reducing the sulfur and nitrogen content in the product, it can be replaced with a porous ceramic molecular sieve as a substrate and loaded with a specific metal oxide. Then, a catalytic reaction can occur when the mixture passes through. For example, molybdenum oxide can be coated on the porous molecular sieve to reduce the content of sulfur dioxide and hydrogen sulfide in the product.

[0024] like Figures 2 to 4 , Figure 6 As shown, the second separator 9 includes obliquely arranged settling tubes 91, each settling tube 91 is fixedly connected, the arc-shaped side surface of the second separator 9 is in contact with the inner wall of the outer shell 1, the inner side of the top of the second separator 9 is against the partition 7, and the bottom is cylindrical, the second separator 9 is inserted into the outer shell 1, and the bottom surface is in contact with the top of the bottom support plate 6; The height of the partition 7 is greater than the height of the top of the separator 1 8, and the height of the separator 2 9 is lower than that of the separator 1 8. A side liquid port 26 is provided between the bottom end of the partition 7 and the adjacent horizontal plane of the separator 2 9. A water storage chamber 14 is provided at the bottom of the bottom bin 11, and the bottom of the water storage chamber 14 is connected to the drain pipe 5. It should be noted that after the light fraction passes through the separator 8 to separate the non-condensable gas, the liquid phase is mixed with the light oil to be extracted and the wastewater to be separated and treated. The mixture falls to the bottom of the cylindrical separator 2 9 after being buffered and dispersed by the filter plates 81 of the separator 8. After the oil and water are separated in the settling tube 91 in the bottom area of ​​the separator 2 9, it falls into the water storage chamber 14 through the liquid hole 61 on the other side of the bottom support plate 6. Since the incoming liquid is blocked by the partition 7 and does not directly enter the settling tube 91, and the settling tubes 91 are obliquely distributed in the vertical direction and blocked from each other, the oil-water mixture enters After entering the settling pipe 91, the turbulence phenomenon is greatly weakened, so that the oil-water mixture can quickly enter the settling separation state. Furthermore, since the non-condensable gas is first discharged by the separation element 8 during the separation process, there will be no bubble interference when the oil and water are separated, thereby achieving the effect of improving the waste oil recovery and wastewater separation efficiency. As the amount of liquid entering the outer shell 1 increases, the light oil after separation is located in the upper layer of the separation element 9 due to its low density, and the separated wastewater has a high density and is located in the lower layer of the separation element 9, and the bottom wastewater accumulates in the water storage chamber 14, and is finally discharged to the wastewater treatment tank through the drain pipe 5; In addition, the height of the partition 7 is the highest, so after the mixture is filled into the outer shell 1, it will not cross the partition 7 and enter the separator 2 9, reducing the possibility of turbulence generation, and the height of the separator 2 9 is in a relatively low state, so as to facilitate subsequent observation and timely discharge of the separated light oil to avoid crossing the partition 7 and mixing with the mixture in the separator 1 8. At the bottom of the partition 7, since a side liquid port 26 is provided between the separator 1 8 and the separator 2 9, the oil and water with the non-condensable gas removed can be diffused into each settling tube 91 as early as possible and over a large area at the bottom of the separator 2 9, thereby improving the oil-water separation efficiency.

[0025] like Figure 4 and Figure 5 As shown, an observation column 15 is installed on one side of the outer shell 1 close to the oil drain pipe 4, and the inner sides of both ends of the observation column 15 are connected to the inner part of the outer shell 1, the top of the observation column 15 is higher than the top of the second separator 9, and the bottom is lower than the top of the second separator 9, and a window 16 is set on the outside of the observation column 15; The installation height of the inlet pipe 2 is higher than the top height of the separator 2 9, the installation height of the oil discharge pipe 4 is located in the middle of the separator 2 9, the outer shell 1 is equipped with a water sight glass 25 just below the oil discharge pipe 4, and the inlet pipe 2, the exhaust pipe 3, the oil discharge pipe 4 and the drain pipe 5 are all equipped with a control valve 17; It should be noted that, with the continuous input of the fluid in the inlet pipe 2, the storage capacity of the fluid inside the outer shell 1 is continuously increased, and the observation column 15 connected to the inner cavity of the outer shell 1 is continuously filled with liquid. When the height of the internal oil-water mixture can be observed through the window 16, the opening of the inlet pipe 2 and the oil discharge pipe 4 is controlled to control the liquid level inside the outer shell 1 at this time. Relying on the settling effect of the settling pipe 91 of the separation part 2 9, the oil discharge pipe 4 and the drain pipe 5 are used to discharge wastewater and light oil respectively, thereby forming a continuous separation of the top fraction of the distillation tower. Preferably, the control valve 17 is an electronic valve, and the staff can control the opening state through the handheld control end, and a liquid level sensor is set inside the outer shell 1 to detect the liquid level height, and intervention can also be made through the manual observation window 16. In addition, since the proportion of wastewater is small, the drain pipe 5 at the bottom is intermittently opened, and the basis for opening is to observe the water-oil interface through the water sight window 25 and judge whether to open it, and the window 16 and the water sight window 25 are both made of high-strength glass; The height of the inlet pipe 2 is relatively high. On the one hand, the non-condensable gas can be discharged quickly, and when the oil-water mixture is intercepted by the filter plate 81, it can have enough travel during the falling process to be fully dispersed, while releasing a small amount of non-condensable gas inside the liquid phase. On the other hand, it avoids the increase of internal liquid accumulation, and the non-condensable gas fills the liquid to generate bubbles, which affects the subsequent oil-water separation process of the separation element 2 9. The oil discharge pipe 4 is located in the middle of the separation element 2 9, which is convenient for the convenient discharge of the light oil after stratification.

[0026] like Figure 7 As shown, the grease trap 10 includes an grease trap chamber 18 connected to the drain pipe 5, one side of the grease trap chamber 18 is connected to the grease trap chamber 2 19 and the grease trap chamber 3 20 in sequence, a partition plate 21 is provided in the middle of the grease trap chamber 18 and the grease trap chamber 2 19, a connecting pipe 22 is installed between the bottoms of two adjacent grease trap chambers, an oil suction branch pipe 23 is installed at the top of each grease trap chamber close to the drain pipe 5, and each oil suction branch pipe 23 is shortened in sequence in the direction away from the drain pipe 5, and a water outlet pipe 24 is installed at the top of the grease trap chamber 3 20 away from the drain pipe 5; It should be noted that the wastewater accumulated in the water storage chamber 14 inside the outer shell 1 will still have a small amount of light oil remaining. After it is discharged along the drain pipe 5, it does not directly enter the treatment process, but needs to be discharged into the grease trap 10 for secondary separation. Specifically, the end of the drain pipe 5 away from the water storage chamber 14 is connected to the middle of the oil trap chamber 18. After entering the oil trap chamber 18, it will be affected by the flow resistance and buffering effect of the inner partition plate 21 and will not directly enter the oil trap chamber 2 19 connected by the connecting pipe 22, but will undergo oil-water separation. After separation, the bottom wastewater enters the oil trap chamber 2 19. This part of the wastewater still contains a small amount of light oil. After separation, it finally enters the oil trap chamber 3 20 for the final separation of a very small amount of light oil. Extraction and separation. Since the thickness of the light oil separated from the top layers of each oil-water separator near the drain pipe 5 gradually decreases, and there is more oil on the side near the drain pipe 5, a successively shortened oil absorption branch pipe 23 is installed on the side near the drain pipe 5 at the top of the oil-water separator 10 to extract the stratified light oil in time, until only wastewater exists at the top of the oil-water separator chamber 20 away from the connecting pipe 22, and then the wastewater is extracted by the outlet pipe 24 for treatment. That is, multiple separations of the wastewater are carried out with the help of the device and the oil-water separator 10, thereby realizing the complete separation function of the wastewater of the top fraction of the distillation tower; preferably, an L-shaped oil-water separator plate is fixedly connected to one side of the inside of the outlet pipe 24 to block a very small amount of light oil near the oil absorption branch pipe 23.

[0027] like Figure 8 As shown, the wastewater treatment pool includes a grease trap 10, an air flotation pool and a biochemical pool. Specifically, after the air flotation pool receives the wastewater discharged from the outlet pipe 24 of the grease trap 10, the pH value of the wastewater is adjusted and coagulants and flocculants are added. Small oil droplets and suspended pollutants in the wastewater are aggregated into agglomerates under the action of flocculation and are brought to the liquid surface by dissolved air bubbles and removed by a slag hanger. Subsequently, the wastewater after air flotation treatment is sent to the biochemical pool for further treatment. The active bacteria loaded on the biological filler in the biochemical pool further decompose the pollutants in the wastewater, especially decompose the macromolecular organic matter into small molecular organic matter, and then decompose into stable inorganic matter such as carbon dioxide and sulfate, thereby completing the purification of the wastewater. In addition, by Figure 8 It can be seen that when waste mineral oil is recycled, the wastewater generated by pretreatment, the wastewater discharged from the bottom during the distillation process, the wastewater separated from the top fraction, and the wastewater separated from the middle fraction are all concentrated in the wastewater treatment pool for unified treatment. The purpose is to achieve the distillation recovery of mineral oil while separating, extracting and treating the wastewater, so that the wastewater treatment of waste mineral oil can effectively meet the emission standards and improve the protection of the environment.

[0028] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A waste mineral oil recycling device for purifying waste water in waste mineral oil, comprising an outer shell (1), an inlet pipe (2) is installed on one side of the outer shell (1), and an exhaust pipe (3) is installed on the top, an oil discharge pipe (4) is installed on the side of the middle part of the outer shell (1) away from the inlet pipe (2), and a drain pipe (5) is installed on the bottom, characterized in that: A bottom support plate (6) is installed at the bottom of the outer shell (1), a separator 2 (9) is installed at the top of the bottom support plate (6), a partition plate (7) is installed on one side of the top of the separator 2 (9), a separator 1 (8) is installed between the inner wall of the outer shell (1) and one side of the partition plate (7), the inlet pipe (2) is connected to the separator 1 (8), the oil discharge pipe (4) is connected to the separator 2 (9), the separator 1 (8) is used to separate non-condensable gas, the separator 2 (9) is used to separate light oil and wastewater, and the bottom of the drain pipe (5) is connected to an oil separator (10), and the oil separator (10) is used to perform secondary separation on the wastewater.

2. A waste mineral oil recycling device for purifying waste water in waste mineral oil according to claim 1, characterized in that: The outer shell (1) comprises a bottom bin (11), a top bin (12) is arranged at the top of the bottom bin (11), and a plurality of bolts (13) are evenly installed along the outer side of the ring between adjacent surfaces of the bottom bin (11) and the top bin (12).

3. The waste mineral oil recycling device for purifying waste water in waste mineral oil according to claim 1, characterized in that: The separator (8) comprises a plurality of filter plates (81) arranged evenly, the filter plates (81) and the partition plate (7) forming an angle of 45-60 degrees in the horizontal direction, the bottom of the filter plate (81) abuts against the bottom support plate (6), the curved side surface of the filter plate (81) abuts against the inner wall of the outer shell (1), and the other side is fixedly connected to the partition plate (7).

4. The waste mineral oil recycling device for purifying waste water in waste mineral oil according to claim 1, characterized in that: The bottom surface of the bottom support plate (6) is evenly distributed with liquid holes (61), and a baffle (62) is provided on the other side. The partition plate (7) is inserted into the interior of the outer shell (1) and is close to one side of the inlet pipe (2).

5. The waste mineral oil recycling device for purifying waste water in waste mineral oil according to claim 1, characterized in that: The second separator (9) comprises obliquely arranged settling tubes (91), each of the settling tubes (91) being fixedly connected to each other, the arc-shaped side surface of the second separator (9) being in contact with the inner wall of the outer shell (1), the inner side of the top of the second separator (9) being in contact with the partition (7), and the bottom being cylindrical, the second separator (9) being inserted into the interior of the outer shell (1), and the bottom surface being in contact with the top of the bottom support plate (6).

6. A waste mineral oil recycling device for purifying waste water in waste mineral oil according to claim 2, characterized in that: The height of the partition (7) is greater than the height of the top end of the separator one (8), and the height of the separator two (9) is lower than the height of the separator one (8). A side liquid port (26) is provided between the bottom end of the partition (7) and the adjacent surface of the separator two (9). A water storage chamber (14) is provided at the bottom of the bottom bin (11), and the bottom of the water storage chamber (14) is connected to the drain pipe (5).

7. The waste mineral oil recycling device for purifying waste water in waste mineral oil according to claim 1, characterized in that: An observation column (15) is installed on one side of the outer shell (1) close to the oil drain pipe (4). The inner sides of both ends of the observation column (15) are connected to the interior of the outer shell (1). The top of the observation column (15) is higher than the top of the second separator (9), and the bottom is lower than the top of the second separator (9). A viewing window (16) is arranged on the outside of the observation column (15).

8. The waste mineral oil recycling device for purifying waste water in waste mineral oil according to claim 1, characterized in that: The installation height of the inlet pipe (2) is higher than the top height of the second separator (9), the installation height of the oil discharge pipe (4) is located in the middle of the second separator (9), the outer shell (1) is equipped with a water sight glass (25) below the oil discharge pipe (4), and the inlet pipe (2), the exhaust pipe (3), the oil discharge pipe (4) and the drain pipe (5) are all equipped with control valves (17).

9. The waste mineral oil recycling device for purifying waste water in waste mineral oil according to claim 1, characterized in that: The oil separator tank (10) includes an oil separator chamber 1 (18) connected to the drain pipe (5), and one side of the oil separator chamber 1 (18) is connected to an oil separator chamber 2 (19) and an oil separator chamber 3 (20) in sequence. A center plate (21) is provided in the middle of the oil separator chamber 1 (18) and the oil separator chamber 2 (19), and a connecting pipe (22) is installed between the bottoms of two adjacent oil separator chambers. An oil suction branch pipe (23) is installed at the top of each oil separator chamber on a side close to the drain pipe (5), and each of the oil suction branch pipes (23) is shortened in sequence in a direction away from the drain pipe (5). A water outlet pipe (24) is installed at the top of the oil separator chamber 3 (20) on a side away from the drain pipe (5).

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