Crude benzene hydrogenation oily wastewater recovery system

Abstract

The utility model discloses a crude benzene hydrogenation oily wastewater recovery system which comprises an oily wastewater storage tank, a centrifugal separation mechanism connected with the oily wastewater storage tank through a pipeline, an oil separation tank connected with the centrifugal separation mechanism through a pipeline, and a sewage storage tank connected with the oil separation tank through a pipeline, the device comprises a tank body and a centrifugal assembly rotatably arranged in the tank body, a plurality of partition plates are evenly distributed on the inner side wall of the tank body, the partition plates are arranged in parallel, the distance between every two partition plates is equal, and the centrifugal assembly comprises a rotating shaft rotatably arranged in the tank body; according to the crude benzene hydrogenation oily wastewater recovery system disclosed by the utility model, a large amount of oily wastewater can be quickly treated, the proportion of an oil phase in the oily wastewater can be reduced, the treatment efficiency of the oily wastewater can be improved, and the wastewater can reach the discharge standard.

Description

Technical Field

[0001] The utility model relates to the technical field of oily wastewater treatment, in particular to a crude benzene hydrogenation oily wastewater recovery system. Background Art

[0002] The crude benzene hydrogenation process involves transferring crude benzene to a vacuum tower to remove heavy benzenes. The light fraction then enters a hydrogenation system and mixes with hydrogen. A catalytic reactor removes sulfur, nitrogen, and oxygen. After three-phase separation, the product enters a stabilization tower to remove hydrogen sulfide. It then enters a distillation tower to remove mixed xylenes. Non-aromatic hydrocarbons are extracted through an extraction system, the extractant is removed, and pure benzene and toluene are finally purified. During the crude benzene hydrogenation process, raw material loss and cleaning of transport tankers and production equipment generate a large amount of wastewater containing organic matter, known as oily wastewater. Chemical wastewater is characterized by high toxicity, a wide variety of pollutants, high concentrations, difficulty in degradation, and poor biodegradability. In existing technology, chemical companies typically treat oily wastewater by passing wastewater with an oil content of less than 5% through an oil-water separator to achieve an outlet water quality of 5 mg / L. The major drawbacks of this treatment process are the high investment and stringent oil content requirements for the influent, making it incapable of treating wastewater with high oil content. Furthermore, subsequent oil sludge treatment is difficult, resulting in an outlet water quality of only 5 mg / L. At the same time, since the treatment capacity of the above-mentioned methods is generally small, they cannot be applied to treat large amounts of oily wastewater, especially oily wastewater with an oil content of more than 5% or higher. Utility Model Content

[0003] In view of this, the utility model provides a crude benzene hydrogenation oily wastewater recovery system to solve the above-mentioned problems.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] A crude benzene hydrogenation oily wastewater recovery system comprises an oily wastewater storage tank, a centrifugal separation mechanism connected to the oily wastewater storage tank via a pipeline, an oil separator connected to the centrifugal separation mechanism via a pipeline, and a sewage storage tank connected to the oil separator via a pipeline, the centrifugal separation mechanism comprises a tank body, and a centrifugal assembly rotatably arranged in the tank body, a plurality of partition plates are evenly distributed on the inner side wall of the tank body, the plurality of partition plates are arranged parallel to each other and the spacing between each two of the partition plates is equal, the centrifugal assembly comprises a rotating shaft rotatably arranged in the tank body, and a centrifugal impeller fixedly mounted on the rotating shaft, the centrifugal impeller and the partition plates in the tank body are staggered.

[0006] Furthermore, a water inlet is provided at the top of the side wall of the oily wastewater storage tank, and a delivery pipe is connected to the bottom of the side wall of the oily wastewater storage tank opposite to the water inlet, and a delivery pump is provided on the delivery pipe. The water inlet and the delivery pipe are both connected to the interior of the oily wastewater storage tank, and one end of the delivery pipe is connected to the centrifugal separation mechanism.

[0007] Furthermore, the centrifugal separation mechanism also includes a support seat arranged at the bottom of the tank body, a transmission wheel rotatably mounted on one end of the tank body and connected to the centrifugal assembly, and a drive motor arranged on one side of the tank body.

[0008] Furthermore, the tank body is a cylindrical structure, the tank body is arranged horizontally on the support base and the tank body is fixedly connected to the support base or formed as one piece, a liquid inlet is provided in the middle of the top of the side wall of the tank body, and an oil outlet and a liquid outlet are provided at both ends of the bottom of the side wall of the tank body, the liquid outlet is provided at one end of the tank body close to the transmission wheel, the liquid inlet, the oil outlet and the liquid outlet are all connected to the interior of the tank body, and one end of the delivery pipe at the bottom of the side wall of the oily wastewater storage tank is connected to the liquid inlet.

[0009] Furthermore, the partition plate is a circular ring structure, and the central axis of the rotating shaft coincides with the central axis of the tank body and the central axis of the transmission wheel.

[0010] Furthermore, a coupling is provided on the side of the transmission wheel close to the centrifugal assembly, one end of the rotating shaft is fixedly connected to the coupling, a transmission belt is sleeved on the transmission wheel, and one end of the transmission belt is sleeved on the driving shaft of the driving motor.

[0011] Furthermore, a water inlet is provided at the top of the side wall of the grease trap, and a water outlet is provided at the bottom of the side wall of the grease trap opposite to the water inlet. The water inlet is connected to the centrifugal separation mechanism through a pipe, and the water outlet is connected to the sewage storage tank through a pipe. A water distribution partition is provided on the side of the interior of the grease trap close to the water inlet, and a connecting pipe is provided at the bottom of the water distribution partition. The water distribution partition and the inner wall of the grease trap on the side where the water inlet is provided together form a water distribution trough. The water inlet is connected to the water distribution trough, and the water distribution trough is connected to the inner cavity of the grease trap through the connecting pipe.

[0012] Furthermore, a first oil baffle plate and a second oil baffle plate perpendicular to the top wall of the oil separator are provided on a side of the inner top wall relatively away from the water distribution tank, and a first oil collecting pipe and a second oil collecting pipe are respectively arranged on the sides of the first oil baffle plate and the second oil baffle plate away from the water outlet, and the first oil collecting pipe and the second oil collecting pipe are both connected to the inner cavity of the oil separator.

[0013] Furthermore, an oil scraping mechanism is installed inside the oil separator, and the oil scraping mechanism is arranged between the first oil baffle plate and the second oil baffle plate.

[0014] Furthermore, the oil scraping mechanism includes a driving wheel and a driven wheel rotatably mounted on the side wall of the oil separator, and a chain belt sleeved on the driving wheel and the driven wheel, and a plurality of oil scraping plates are evenly distributed on the chain belt, and the plurality of oil scraping plates are vertically arranged on the chain belt and the distance between each two oil scraping plates is equal.

[0015] The beneficial effects of the utility model are:

[0016] The crude benzene hydrogenation oily wastewater recovery system provided by the utility model comprises an oily wastewater storage tank for storing oily wastewater, a centrifugal separation mechanism connected to the oily wastewater storage tank through a pipeline for centrifugally separating the oil phase in the oily wastewater, an oil separator connected to the centrifugal separation mechanism through a pipeline for further collecting the oil phase in the oily wastewater, and a sewage storage tank connected to the oil separator through a pipeline for storing sewage, wherein the centrifugal separation mechanism comprises a tank body for accommodating oily wastewater, and a centrifugal assembly rotatably arranged in the tank body for centrifugally separating the oily wastewater, and a plurality of partition plates that cooperate with the centrifugal assembly are evenly distributed on the inner side wall of the tank body. The partition plates are arranged parallel to each other and the spacing between every two partition plates is equal; the centrifugal assembly includes a rotating shaft rotatably arranged inside the tank body, and a centrifugal impeller fixedly mounted on the rotating shaft. The centrifugal impeller and the partition plates in the tank body are staggered. When the rotating shaft rotates, the centrifugal impeller is driven to rotate along with the rotating shaft and exerts centrifugal force on the oily wastewater in the tank body to separate the oil phase in the oily wastewater, thereby quickly treating a large amount of oily wastewater and quickly separating a large amount of oil phase in high-oil-content wastewater from the wastewater, reducing the proportion of oil phase in the oily wastewater, facilitating subsequent treatment, improving the treatment efficiency of oily wastewater, and making the wastewater meet the discharge standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a front view of the crude benzene hydrogenation oily wastewater recovery system of the utility model;

[0019] Figure 2 for Figure 1 A cross-sectional view of the centrifugal separation mechanism in the crude benzene hydrogenation oily wastewater recovery system of the present invention is shown;

[0020] Figure 3 for Figure 1 The figure shows a cross-sectional view of the oil separator in the crude benzene hydrogenation oily wastewater recovery system of the present invention.

[0021] Figure 100, crude benzene hydrogenation oily wastewater recovery system, 1, oily wastewater storage tank, 11, wastewater inlet, 12, delivery pipe, 13, delivery pump, 2, centrifugal separation mechanism, 21, tank body, 211, liquid inlet, 212, oil outlet, 213, liquid outlet, 214, partition plate, 22, support base, 23, centrifugal assembly, 231, rotating shaft, 232, centrifugal impeller, 24, transmission wheel, 241, coupling , 242, transmission belt, 25, drive motor, 3, grease trap, 31, water inlet, 32, water outlet, 33, water distribution wall, 331, connecting pipe, 332, water distribution trough, 34, first oil baffle, 341, first oil collecting pipe, 35, second oil baffle, 351, second oil collecting pipe, 36, oil scraping mechanism, 361, driving wheel, 362, driven wheel, 363, chain belt, 364, oil scraping plate, 4, sewage storage tank. DETAILED DESCRIPTION

[0022] The present invention will now be described in detail with reference to the accompanying drawings. This drawing is a simplified schematic diagram, which only illustrates the basic structure of the present invention in a schematic manner, and therefore only shows the components related to the present invention.

[0023] like Figure 1 As shown, the utility model provides a crude benzene hydrogenation oily wastewater recovery system 100, which is used to treat the oily wastewater generated in the crude benzene hydrogenation production and processing process. The crude benzene hydrogenation oily wastewater recovery system 100 of the utility model includes an oily wastewater storage tank 1 for storing oily wastewater, a centrifugal separation mechanism 2 connected to the oily wastewater storage tank 1 through a pipeline for centrifugally separating the oil phase in the oily wastewater, an oil separator 3 connected to the centrifugal separation mechanism 2 through a pipeline for further collecting the oil phase in the oily wastewater, and a sewage storage tank 4 connected to the oil separator 3 through a pipeline for storing sewage. The oily wastewater stored in the oily wastewater storage tank 1 is transported to the centrifugal separation mechanism 2 for preliminary separation to obtain part of the oil phase and treated oily wastewater. The treated oily wastewater is then transported to the oil separator 3 for oil collection treatment. The collected oil phase is uniformly recovered and treated, and the sewage is transported to the sewage storage tank 4 for collection and waiting for subsequent treatment and discharge.

[0024] like Figure 1 As shown, a water inlet 11 for collecting oily wastewater is provided at the top of the side wall of the oily wastewater storage tank 1, and a delivery pipe 12 for conveying oily wastewater is connected to the bottom of the side wall of the oily wastewater storage tank 1 opposite to the water inlet 11. A delivery pump 13 is provided on the delivery pipe 12. The water inlet 11 and the delivery pipe 12 are both connected to the interior of the oily wastewater storage tank 1, and one end of the delivery pipe 12 is connected to the centrifugal separation mechanism 2. The oily wastewater in the oily wastewater storage tank 1 is conveyed to the centrifugal separation mechanism 2 through the delivery pipe 12 under the action of the delivery pump 13 for centrifugal separation treatment.

[0025] like Figure 1 and Figure 2 As shown, the centrifugal separation mechanism 2 includes a tank body 21 for accommodating oily wastewater, a support base 22 arranged at the bottom of the tank body 21 for supporting the tank body 21, a centrifugal assembly 23 rotatably arranged in the tank body 21 for centrifugally separating the oily wastewater, a transmission wheel 24 rotatably mounted at one end of the tank body 21 and connected to the centrifugal assembly 23, and a drive motor 25 arranged on one side of the tank body 21 for driving the transmission wheel 24; the tank body 21 is roughly cylindrical in structure, the tank body 21 is horizontally arranged on the support base 22 and the tank body 21 and the support base 22 are fixedly connected or integrally formed, a liquid inlet 211 is opened in the middle of the top of the side wall of the tank body 21, and the side of the tank body 21 is provided with a liquid inlet 211. An oil outlet 212 for discharging the oil phase and a liquid outlet 213 for discharging the treated oily wastewater are respectively provided at both ends of the bottom of the wall, wherein the liquid outlet 213 is provided at one end of the tank body 21 close to the transmission wheel 21, and the liquid inlet 211, the oil outlet 212 and the liquid outlet 213 are all connected to the interior of the tank body 21, and one end of the delivery pipe 12 at the bottom of the side wall of the oily wastewater storage tank 1 is connected to the liquid inlet 211, and the oily wastewater in the oily wastewater storage tank 1 enters the tank body 21 through the delivery pipe 12 and the liquid inlet 211; a plurality of partition plates 214 that cooperate with the centrifugal assembly 23 are evenly distributed on the inner side wall of the tank body 21, and the partition plates 214 are roughly circular rings. The centrifugal assembly 23 comprises a rotating shaft 231 rotatably arranged inside the tank body 21, and a centrifugal impeller 232 fixedly mounted on the rotating shaft 231. The central axis of the rotating shaft 231 coincides with the central axis of the tank body 21 and the central axis of the transmission wheel 24, and the centrifugal impeller 232 is staggered with the partition plates 214 in the tank body 21. A coupling 241 is provided on the side of the transmission wheel 24 close to the centrifugal assembly 23. One end of the rotating shaft 231 is fixedly connected to the coupling 241. A transmission belt 242 is sleeved on the transmission wheel 24. The transmission belt 242 is fixedly mounted on the transmission wheel 24. One end of 42 is sleeved on the driving shaft of the driving motor 25, and the driving motor 25 drives the driving wheel 24 to rotate through the transmission belt 242. When the driving wheel 24 rotates, it drives the rotating shaft 231 to rotate through the coupling 241, so that the centrifugal impeller 232 rotates along the rotating shaft 231 and applies centrifugal force to the oily wastewater in the tank body 21 to separate the oil phase in the oily wastewater. The separated oil phase flows along the partition plate 214 to the end close to the oil outlet 212 and is discharged and collected from the oil outlet 212. The treated oily wastewater flows to the end close to the liquid outlet 213 and is discharged from the liquid outlet 213 and is transported to the oil separator through a pipeline for subsequent treatment.

[0026] like Figure 1 and Figure 3As shown, a water inlet 31 is provided at the top of the side wall of the grease trap 3, and a water outlet 32 ​​is provided at the bottom of the side wall of the grease trap 3 on the side opposite to the water inlet 31. The water inlet 31 is connected to the liquid outlet 213 on the centrifugal separation mechanism 2 through a pipeline, and the water outlet 32 ​​is connected to the sewage storage tank through a pipeline. A water distribution partition wall 33 is provided on the side of the grease trap 3 near the water inlet 31, and a connecting pipe 331 is provided at the bottom of the water distribution partition wall 33. The water distribution partition wall 33 and the inner wall of the side of the grease trap 3 on which the water inlet 31 is provided together form a space for accommodating the treated oily waste. The water distribution trough 332 is connected to the water distribution trough 332, and the water distribution trough 332 is connected to the inner cavity of the oil-water separator 3 through the connecting pipe 331. The oily wastewater treated in the water distribution trough 332 is transported to the inner cavity of the oil-water separator 3 through the connecting pipe 331; the inner top wall of the oil-water separator 3 is relatively far away from the water distribution trough 332. A first oil baffle plate 34 and a second oil baffle plate 35 are perpendicular to the top wall of the oil-water separator 3 for blocking the oil phase. The sides of the first oil baffle plate 34 and the second oil baffle plate 35 away from the water outlet 32 ​​are respectively arranged with a The first oil collecting pipe 341 and the second oil collecting pipe 351 are both connected to the inner cavity of the oil separator 3; the oil separator 3 is also equipped with an oil scraping mechanism 36, which is arranged between the first oil baffle plate 34 and the second oil baffle plate 35. The oil scraping mechanism 36 includes a driving wheel 361 and a driven wheel 362 rotatably mounted on the side wall of the oil separator 3, and a chain belt 363 sleeved on the driving wheel 361 and the driven wheel 362. A plurality of oil scraping plates 36 for scraping the oil phase are evenly distributed on the chain belt 363. 4. Multiple scrapers 364 are vertically arranged on the chain belt 363 and the distance between every two scrapers 364 is equal. The treated oily wastewater enters the inner cavity of the oil separator 3 through the water distribution trough 332 and flows slowly in the horizontal direction. During the flow, the oil phase floats to the water surface, and part of the oil phase flows out through the first oil collecting pipe 341 into the dehydration tank. The subsequent oil phase flows out through the second oil collecting pipe 351 into the dehydration tank under the push of the scraper 364 on the scraper mechanism 36. The remaining sewage is discharged through the water outlet 32 ​​and transported to the sewage storage tank for storage and waiting for subsequent treatment.

[0027] When treating oily wastewater, the delivery pump 13 is started, and the oily wastewater stored in the oily wastewater storage tank 1 is delivered to the tank body 21 of the centrifugal separation mechanism 2 through the delivery pipe 12 under the action of the delivery pump 13. The drive motor 25 is started, and the drive motor 25 drives the transmission wheel 24 to rotate through the transmission belt 242. When the transmission wheel 24 rotates, the rotation shaft 231 is driven to rotate through the coupling 241, so that the centrifugal impeller 232 rotates along with the rotation shaft 231 and applies centrifugal force to the oily wastewater in the tank body 21 to separate the oil phase in the oily wastewater. The separated oil phase flows along the partition plate 214 to the end close to the oil outlet 212 and is discharged from the oil outlet. The oily wastewater is discharged and collected through the outlet 212, and the treated oily wastewater flows to the end close to the liquid outlet 213 and is discharged from the liquid outlet 213 and then transported to the grease trap 3 through a pipeline. The treated oily wastewater entering the grease trap 3 enters the inner cavity of the grease trap 3 through the water distribution tank 332 and flows slowly in the horizontal direction. During the flow, the oil phase floats to the water surface, and part of the oil phase flows out through the first oil collecting pipe 341 into the dehydration tank. The subsequent oil phase flows out through the second oil collecting pipe 351 into the dehydration tank under the push of the oil scraper 364 on the oil scraper mechanism 36, and the remaining sewage is discharged through the water outlet 32 ​​and transported to the sewage storage tank 4 for storage and waiting for subsequent treatment.

[0028] The crude benzene hydrogenation oily wastewater recovery system 100 provided by the present invention comprises an oily wastewater storage tank 1 for storing oily wastewater, a centrifugal separation mechanism 2 connected to the oily wastewater storage tank 1 through a pipeline for centrifugally separating the oil phase in the oily wastewater, an oil separator 3 connected to the centrifugal separation mechanism 2 through a pipeline for further collecting the oil phase in the oily wastewater, and a sewage storage tank 4 connected to the oil separator 3 through a pipeline for storing sewage, wherein the centrifugal separation mechanism 2 comprises a tank body 21 for accommodating oily wastewater, and a centrifugal assembly 23 rotatably arranged in the tank body 21 for centrifugally separating the oily wastewater, and a plurality of partition plates 214 that cooperate with the centrifugal assembly 23 are evenly distributed on the inner side wall of the tank body 21, and the plurality of partition plates 214 are evenly distributed. They are arranged parallel to each other and the spacing between each two partition plates 214 is equal; the centrifugal assembly 23 includes a rotating shaft 231 rotatably arranged inside the tank body 21, and a centrifugal impeller 232 fixedly mounted on the rotating shaft 231. The centrifugal impeller 232 and the partition plates 214 in the tank body 21 are staggered. When the rotating shaft 231 rotates, the centrifugal impeller 232 is driven to rotate along with the rotating shaft 231 and exert centrifugal force on the oily wastewater in the tank body 21 to separate the oil phase in the oily wastewater, thereby quickly treating a large amount of oily wastewater and quickly separating a large amount of oil phase in high-oil-content wastewater from the wastewater, reducing the proportion of oil phase in the oily wastewater, facilitating subsequent treatment, improving the treatment efficiency of oily wastewater, and making the wastewater meet the discharge standards.

[0029] Based on the above-mentioned ideal embodiment of the present invention, and in accordance with the above description, relevant personnel can make various changes and modifications without departing from the scope of the present invention. The technical scope of this utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A crude benzene hydrogenation oily wastewater recovery system, characterized in that: It includes an oily wastewater storage tank, a centrifugal separation mechanism connected to the oily wastewater storage tank through a pipeline, a grease trap connected to the centrifugal separation mechanism through a pipeline, and a sewage storage tank connected to the grease trap through a pipeline. The centrifugal separation mechanism includes a tank body and a centrifugal assembly rotatably arranged in the tank body. A plurality of partition plates are evenly distributed on the inner side wall of the tank body. The plurality of partition plates are arranged parallel to each other and the distance between each two partition plates is equal. The centrifugal assembly includes a rotating shaft rotatably arranged in the tank body, and a centrifugal impeller fixedly mounted on the rotating shaft. The centrifugal impeller and the partition plates in the tank body are staggered.

2. The crude benzene hydrogenation oily wastewater recovery system according to claim 1, characterized in that: A water inlet is provided at the top of the side wall of the oily wastewater storage tank, and a delivery pipe is connected to the bottom of the side wall of the oily wastewater storage tank opposite to the water inlet. A delivery pump is provided on the delivery pipe. The water inlet and the delivery pipe are both connected to the interior of the oily wastewater storage tank, and one end of the delivery pipe is connected to the centrifugal separation mechanism.

3. The crude benzene hydrogenation oily wastewater recovery system according to claim 2, characterized in that: The centrifugal separation mechanism also includes a support seat arranged at the bottom of the tank body, a transmission wheel rotatably installed at one end of the tank body and connected to the centrifugal assembly, and a drive motor arranged at one side of the tank body.

4. The crude benzene hydrogenation oily wastewater recovery system according to claim 3, characterized in that: The tank body is a cylindrical structure, and the tank body is arranged horizontally on the support base and the tank body is fixedly connected to the support base or formed as one piece. A liquid inlet is provided in the middle of the top of the side wall of the tank body, and an oil outlet and a liquid outlet are provided at both ends of the bottom of the side wall of the tank body. The liquid outlet is provided at one end of the tank body close to the transmission wheel. The liquid inlet, the oil outlet and the liquid outlet are all connected to the interior of the tank body, and one end of the delivery pipe at the bottom of the side wall of the oily wastewater storage tank is connected to the liquid inlet.

5. The crude benzene hydrogenation oily wastewater recovery system according to claim 3, characterized in that: The partition plate is a circular ring structure, and the central axis of the rotating shaft coincides with the central axis of the tank body and the central axis of the transmission wheel.

6. The crude benzene hydrogenation oily wastewater recovery system according to claim 3, characterized in that: A coupling is provided on the side of the transmission wheel close to the centrifugal assembly, one end of the rotating shaft is fixedly connected to the coupling, a transmission belt is sleeved on the transmission wheel, and one end of the transmission belt is sleeved on the driving shaft of the driving motor.

7. The crude benzene hydrogenation oily wastewater recovery system according to claim 1, characterized in that: A water inlet is provided at the top of the side wall of the grease trap, and a water outlet is provided at the bottom of the side wall of the grease trap opposite to the water inlet. The water inlet is connected to the centrifugal separation mechanism through a pipe, and the water outlet is connected to the sewage storage tank through a pipe. A water distribution partition is provided on the side of the interior of the grease trap close to the water inlet, and a connecting pipe is provided at the bottom of the water distribution partition. The water distribution partition and the inner wall of the grease trap on the side where the water inlet is provided together form a water distribution trough. The water inlet is connected to the water distribution trough, and the water distribution trough is connected to the inner cavity of the grease trap through the connecting pipe.

8. The crude benzene hydrogenation oily wastewater recovery system according to claim 7, characterized in that: A first oil baffle plate and a second oil baffle plate perpendicular to the top wall of the oil separator are provided on the side of the inner top wall relatively away from the water distribution tank, and a first oil collecting pipe and a second oil collecting pipe are respectively arranged on the sides of the first oil baffle plate and the second oil baffle plate away from the water outlet. The first oil collecting pipe and the second oil collecting pipe are both connected to the inner cavity of the oil separator.

9. The crude benzene hydrogenation oily wastewater recovery system according to claim 8, characterized in that: An oil scraping mechanism is also installed inside the oil separator, and the oil scraping mechanism is arranged between the first oil baffle plate and the second oil baffle plate.

10. The crude benzene hydrogenation oily wastewater recovery system according to claim 9, characterized in that: The oil scraping mechanism includes a driving wheel and a driven wheel rotatably mounted on the side wall of the oil separator, and a chain belt sleeved on the driving wheel and the driven wheel. A plurality of oil scraping plates are evenly distributed on the chain belt. The plurality of oil scraping plates are vertically arranged on the chain belt and the spacing between each two oil scraping plates is equal.

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