A raw material oil refining processing wastewater treatment device

Abstract

The application discloses a raw material oil refining processing wastewater treatment device and relates to the technical field of wastewater treatment. In the application, arc cover plates are fixed at four corner positions in a demulsification reaction box, a lifting driving part is arranged on the side of the demulsification reaction box and is configured to drive the secondary demulsification assembly to reciprocatingly rotate, the secondary demulsification assembly is rotatably arranged in the arc cover plate, a double-medium conveying assembly is rotatably connected with the secondary demulsification assembly, the primary demulsification assembly comprises jet nozzles corresponding to the secondary demulsification assembly one by one, the secondary demulsification assembly is configured to change the flow direction of acid demulsifiers sprayed by the jet nozzles, one end of an oil discharging part extends to the outside of the demulsification reaction box, and an oil collecting part is connected with the oil discharging part and is in sliding fit with the oil discharging part. Through the joint action of the primary demulsification assembly and the secondary demulsification assemblies arranged at the four corners of the demulsification reaction box, the multi-stage demulsification treatment of wastewater is realized based on acid demulsifiers and salt demulsifiers, and the oil removal demulsification reaction effect on edible oil refining wastewater is improved.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, and in particular relates to a wastewater treatment device for crude oil refining. Background Technology

[0002] The refining and processing of edible oils generates a large amount of high-concentration organic wastewater, characterized by the presence of floating oil and emulsified oil. This high-concentration organic wastewater typically requires biodegradation in a biological reactor. However, the presence of floating oil and emulsified oil in the wastewater severely hinders the biodegradation process. Therefore, the wastewater needs to be treated to remove oil before being transferred to the biological reactor.

[0003] A Chinese patent application with publication number CN118561369A discloses an oil-water separation device for treating oily wastewater, including a gravity separation mechanism and a freezing separation mechanism. The gravity separation mechanism includes an oil-water separation unit and a demulsification heating unit, while the freezing separation mechanism includes a drive switching unit and a temperature regulation unit. After the user injects the demulsifier into the inner cavity of a hollow square tube, the hollow square tube is manually rotated as a whole. The demulsifier is evenly output from a one-way spray pipe into the wastewater, breaking down the emulsion oil inside the wastewater.

[0004] In the process of wastewater treatment, the demulsifier flowing inside the rotating hollow square tube of the above-mentioned oil-water separation device is dispersed into the wastewater. Based on the characteristics of floating oil and emulsified oil in edible oil refining wastewater, the single-stage treatment method that relies solely on the hollow square tube to transport the demulsifier has limited oil removal efficiency and is prone to poor oil removal effect on high-concentration organic wastewater, which in turn affects the treatment of wastewater in the downstream biological treatment tank. Summary of the Invention

[0005] The purpose of this invention is to provide a wastewater treatment device for crude oil refining. Through the specific structural design of a multi-stage demulsification system and a secondary oil removal system located at the bottom of the multi-stage demulsification system, it solves the technical pain points of uneven contact between the reagent and the wastewater, long demulsification time, and incomplete oil removal when conventional single-stage static dosing is used to treat high-concentration emulsified oil wastewater.

[0006] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: The present invention is a wastewater treatment device for crude oil refining and processing, including a multi-stage demulsification system and a secondary oil removal system located at the bottom of the multi-stage demulsification system. The secondary oil removal system is configured to receive the drainage from the bottom of the multi-stage demulsification system and perform secondary oil removal.

[0007] The multi-stage demulsification system includes a demulsification reaction chamber with arc-shaped covers fixed at its four corners, the open ends of which face the axis of the demulsification reaction chamber; a lifting and rotating unit located around the demulsification reaction chamber and corresponding to each arc-shaped cover, with a secondary demulsification assembly rotatably mounted inside the arc-shaped covers, the lifting and rotating unit configured to drive the secondary demulsification assembly to reciprocate; a dual-media conveying assembly located above the demulsification reaction chamber and rotatably connected to each secondary demulsification assembly, configured to convey salt demulsifier or air through the secondary demulsification assembly; a primary demulsification assembly including jet nozzles corresponding to each secondary demulsification assembly, the secondary demulsification assembly configured to change the flow direction of the acid demulsifier sprayed from the jet nozzles; and a primary oil removal assembly located inside the demulsification reaction chamber and including an oil collection section and an oil discharge section, one end of which extends to the outside of the demulsification reaction chamber, the oil collection section connecting to the oil discharge section and the two slidingly engaged.

[0008] The invention is further configured such that an electric actuator is installed on the periphery of the demulsification reaction chamber, and a spiral adapter is connected to the output end of the electric actuator; the lifting and rotating part is composed of the electric actuator and the spiral adapter; an inlet pipe and an outlet pipe are respectively installed on the periphery of the demulsification reaction chamber, the inlet pipe is set close to the top of the demulsification reaction chamber, and the outlet pipe is set close to the bottom of the demulsification reaction chamber; both the inlet pipe and the outlet pipe are equipped with solenoid valves; an arc-shaped drain cover is connected to the end of the outlet pipe, and a limit ring is fixed on the side of the arc-shaped drain cover near the demulsification reaction chamber; the interior of the arc-shaped drain cover is a hollow structure and its inner wall has a drainage outlet, which is coaxially arranged with the limit ring.

[0009] The present invention is further configured such that the secondary demulsification assembly includes a rotating cylinder that fits against the inner wall of the arc-shaped cover plate, a fluid reflector plate is fixed inside the opening side of the rotating cylinder, a plurality of dispersion holes communicating with the internal guiding cavity are arrayed on the circumferential side of the rotating cylinder, a guiding pipe communicating with the guiding cavity through a flow port is fixed at the top of the rotating cylinder, and a spiral adapter seat is sleeved on the guiding pipe and adapted to the spiral groove on the guiding pipe.

[0010] The present invention is further configured such that the dual-medium delivery assembly includes a hollow guide ring, and a rotary joint is rotatably connected to the bottom of the hollow guide ring via a diverter pipe. The rotary joint is rotatably connected to the corresponding guide pipe. A guide frame and a support frame are fixed on opposite sides of the demulsification reaction chamber, respectively. The support frame is fixed on one side of the hollow guide ring, and the guide frame is fixed on the other side of the hollow guide ring and are interconnected. An emulsion delivery pipe is connected to the guide frame, and a gas delivery pipe connected to the hollow guide ring is provided on the support frame. Solenoid valves are installed on both the emulsion delivery pipe and the gas delivery pipe.

[0011] The present invention is further configured such that the primary demulsification assembly includes a main demulsification pipe fixed at the center of the demulsification reaction chamber, a plurality of demulsification branch pipes are connected to the periphery of the main demulsification pipe, a jet nozzle is installed at the end of the demulsification branch pipes, and an emulsion delivery pipe II connected to the main demulsification pipe is installed on the demulsification reaction chamber.

[0012] The present invention is further configured such that the primary oil removal component includes an oil collecting element sleeved on the demulsification main pipe, an oil collecting pipe connected to the top oil collecting chamber of the oil collecting element is fixed on the peripheral side of the oil collecting element, an electric actuator is installed on the top of the demulsification reaction box, and a support plate fixed on the peripheral side of the oil collecting element is connected to the corresponding electric actuator; an oil guiding pipe is fixed at the bottom of the demulsification reaction box, an oil discharge pipe penetrating the demulsification reaction box is connected to the peripheral side of the oil guiding pipe close to the bottom, a piston component that slides within the oil guiding pipe is fixed on the outer wall of the oil collecting pipe, the oil collecting part is composed of the oil collecting element, the oil collecting pipe and the piston component, and the oil discharge part is composed of the oil guiding pipe and the oil discharge pipe.

[0013] The present invention is further configured such that the secondary oil removal system includes a wastewater transfer box connected to the demulsification reaction box via a support frame, a secondary oil collection box is installed on one side of the wastewater transfer box, the wastewater transfer box and the secondary oil collection box are connected through an installation port, the secondary oil collection box is provided with an inclined oil scraper penetrating the installation port, and an electric actuator connected to the inclined oil scraper is provided on one side of the secondary oil collection box.

[0014] The invention is further configured such that the output end of the drive motor installed on the other side of the sewage transfer box is connected to a support shaft, and a multi-hole mounting cylinder is fixed on the connecting frame fixedly sleeved on the support shaft. One end of the multi-hole mounting cylinder is fixed with a support ring that rotates with the inner wall of the limiting ring. The multi-hole mounting cylinder is located inside the arc-shaped drainage cover and its outer wall is used to cover an oil-absorbing and water-repellent cloth.

[0015] The present invention has the following beneficial effects: 1. The present invention realizes the primary demulsification treatment of acid demulsifier in wastewater through the primary demulsification component, and realizes the secondary demulsification treatment of salt demulsifier in wastewater through the secondary demulsification component arranged at the four corners of the demulsification reaction tank. Through the multi-stage demulsification reaction of acid demulsifier and salt demulsifier, the deoiling and demulsification reaction effect on edible oil refining wastewater is improved.

[0016] 2. In this invention, when the acid demulsifier fluid sprayed from the jet nozzle comes into contact with the fluid reflector plate, the rotating fluid reflector plate can change the reflected flow direction of the acid demulsifier in real time. After the reflected flow direction is changed, the acid demulsifier gradually disperses towards the central area of ​​the demulsification reaction tank. When the reflected acid demulsifier fluid comes into contact with the inner wall of the demulsification reaction tank, it is reflected again and changes its flow direction. In this way, the acid demulsifier fluid radiating from the center can be dispersed to different positions in the demulsification reaction tank, thereby ensuring the mixing reaction effect of the acid demulsifier in the wastewater.

[0017] 3. In order to improve the aggregation of floating oil near the oil collecting device during the oil discharge process, the present invention delivers airflow or bubbles into the demulsification reaction tank through the dispersion holes on each rotating cylinder. In this way, the floating oil can be aggregated at the oil collecting device by airflow or bubbles, thereby improving the oil discharge efficiency and effect. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the wastewater treatment device for crude oil refining in this invention.

[0020] Figure 2 for Figure 1 A structural diagram from another angle.

[0021] Figure 3 This is a schematic diagram of the multi-stage demulsification system in this invention.

[0022] Figure 4 for Figure 3 A cross-sectional view of the structure of the arc-shaped drainage cover.

[0023] Figure 5 for Figure 3 Top view of the structure.

[0024] Figure 6 for Figure 3 A partial structural diagram.

[0025] Figure 7 This is a schematic diagram of the structure of the secondary demulsification component in this invention.

[0026] Figure 8 for Figure 7 A cross-sectional view of the structure.

[0027] Figure 9 This is a schematic diagram of the two-stage oil removal system in this invention.

[0028] Figure 10 This is a schematic diagram of the structure of the porous mounting cylinder in this invention.

[0029] The attached diagram lists the components represented by each number as follows: 1. Multi-stage demulsification system; 2. Two-stage oil removal system; 3. Demulsification reaction chamber; 4. Arc-shaped cover plate; 5. Two-stage demulsification assembly; 6. Dual-media conveying assembly; 7. First-stage demulsification assembly; 8. Jet nozzle; 9. First-stage oil removal assembly; 10. Electric actuator; 11. Spiral adapter seat; 12. Inlet pipe; 13. Outlet pipe; 14. Solenoid valve; 15. Arc-shaped drain cover; 16. Limiting ring; 17. Drainage outlet; 18. Rotating cylinder; 19. Fluid reflector plate; 20. Flow guide cavity; 21. Flow outlet; 22. Flow guide pipe; 23. Spiral channel; 24. Hollow guide ring; 25. Rotary joint; 26. Guide frame; 27. Support frame; 28. Emulsion delivery pipe one; 29. ​​Gas delivery pipe; 30. Demulsification main pipe; 31. Demulsification branch pipe; 32. Emulsion delivery pipe two; 33. Oil collecting component; 34. Oil collecting pipe; 35. Support plate; 36. Oil guiding pipe; 37. Oil discharge pipe; 38. Piston component; 39. Wastewater transfer box; 40. Secondary oil collecting box; 41. Inclined oil scraper; 42. Drive motor; 43. Support shaft; 44. Connecting frame; 45. Multi-hole mounting cylinder; 46. Support ring. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Example 1, please refer to Figures 1 to 10 This invention relates to a wastewater treatment device for crude oil refining and processing, comprising a multi-stage demulsification system 1 and a secondary oil removal system 2 located at the bottom of the multi-stage demulsification system 1. The secondary oil removal system 2 is configured to receive the drainage from the bottom of the multi-stage demulsification system 1 and perform secondary oil removal. The multi-stage demulsification system 1 achieves multi-stage demulsification treatment of the edible oil refining and processing wastewater, converting the emulsified oil in the wastewater into floating oil to improve the oil removal efficiency. The secondary oil removal system 2 further achieves oil removal from the wastewater, thus improving the oil removal efficiency of the edible oil refining and processing wastewater.

[0032] The multi-stage demulsification system 1 includes a demulsification reaction chamber 3, a lifting and rotating part, a dual-media conveying assembly 6, a primary demulsification assembly 7, and a primary oil removal assembly 9. Arc-shaped cover plates 4 are fixed at the four corners inside the demulsification reaction chamber 3, with the open ends of the arc-shaped cover plates 4 facing the axis of the demulsification reaction chamber 3. The lifting and rotating part is located around the demulsification reaction chamber 3 and corresponds one-to-one with the arc-shaped cover plates 4. A secondary demulsification assembly 5 is rotatably installed inside the arc-shaped cover plates 4, and the lifting and rotating part is configured to drive the secondary demulsification assembly 5 to reciprocate.

[0033] A dual-media delivery assembly 6 is located above the demulsification reaction chamber 3 and is rotatably connected to each of the secondary demulsification assemblies 5. The dual-media delivery assembly 6 is configured to deliver salt demulsifier or air through the secondary demulsification assemblies 5. The primary demulsification assembly 7 includes jet nozzles 8 that correspond one-to-one with the secondary demulsification assemblies 5. The secondary demulsification assemblies 5 are configured to change the flow direction of the acid demulsifier sprayed from the jet nozzles 8. The primary oil removal assembly 9 is located inside the demulsification reaction chamber 3 and includes an oil collection section and an oil discharge section. One end of the oil discharge section extends to the outside of the demulsification reaction chamber 3. The oil collection section is connected to the oil discharge section and the two are slidably engaged.

[0034] In this embodiment of the invention, as Figures 3 to 5 As shown, electric actuators 10 are installed on the sides of the demulsification reaction tank 3. The output end of the electric actuators 10 is connected to a spiral adapter seat 11. The lifting and rotating part is composed of the electric actuators 10 and the spiral adapter seat 11. Water inlet pipes 12 and water outlet pipes 13 are installed on the sides of the demulsification reaction tank 3. The water inlet pipe 12 is set close to the top of the demulsification reaction tank 3, and the water outlet pipe 13 is set close to the bottom of the demulsification reaction tank 3. Solenoid valves 14 are installed on both the water inlet pipe 12 and the water outlet pipe 13. The water inlet pipe 12 is connected to the external equalization tank through a water pump and a water pipeline. The wastewater in the equalization tank can be transported to the demulsification reaction tank 3 through the water pump and the water pipeline. The wastewater is treated for sludge removal in the equalization tank to prevent particulate impurities from entering the demulsification reaction tank 3.

[0035] An arc-shaped drain cover 15 is connected to the end of the water outlet pipe 13. A limit ring 16 is fixed to the side of the arc-shaped drain cover 15 near the demulsification reaction chamber 3. The arc-shaped drain cover 15 has a hollow structure inside and a drainage outlet 17 is opened on its inner wall. The drainage outlet 17 is coaxially arranged with the limit ring 16. The specific structure of the arc-shaped drain cover 15 and the drainage outlet 17 is as follows. Figure 4 As shown. After the solenoid valve 14 on the outlet pipe 13 is opened, the wastewater at the bottom of the demulsification reaction tank 3 flows into the inner cavity of the arc-shaped drain cover 15 along the outlet pipe 13. The wastewater entering the arc-shaped drain cover 15 gradually flows downward along its inner wall. The arc-shaped drain cover 15 realizes the guiding effect of the flowing wastewater, so that the wastewater flows out along the drainage outlet 17 on the inner wall of the arc-shaped drain cover 15.

[0036] In this embodiment of the invention, as Figure 1 , Figure 7 and Figure 8As shown, the secondary demulsification assembly 5 includes a rotating cylinder 18 that fits against the inner wall of the arc-shaped cover plate 4, and a fluid reflector plate 19 is fixed inside the opening side of the rotating cylinder 18. When the acid demulsifier fluid sprayed by the jet nozzle 8 comes into contact with the concave arc-shaped or inclined fluid reflector plate 19, the rotating fluid reflector plate 19 can change the reflected flow direction of the acid demulsifier in real time. By using its arc / inclined surface, the divergent jet is concentrated or deflected at multiple angles. Combined with the rotational motion, it achieves multi-directional sweeping distribution. After the reflected flow direction is changed, the acid demulsifier gradually disperses towards the central area of ​​the demulsification reaction tank 3. When the reflected acid demulsifier fluid comes into contact with the inner wall of the demulsification reaction tank 3, it is reflected again and changes its flow direction. In this way, the acid demulsifier fluid radiating from the center is dispersed to different positions in the demulsification reaction tank 3, thereby ensuring the mixing reaction effect of the acid demulsifier in the wastewater. Alkaline soap residue in wastewater can be converted into a free fatty acid oil layer by using an acid demulsifier (dilute sulfuric acid solution or dilute hydrochloric acid solution), thus achieving demulsification and stratification of oily wastewater (primary demulsification treatment).

[0037] The rotating cylinder 18 has several dispersion holes arranged on its circumferential side, communicating with the internal guide cavity 20. These dispersion holes are used for the output of salt demulsifier or air. The salt demulsifier is selected from calcium chloride solution or polyaluminum chloride solution. A guide pipe 22 is fixed at the top of the rotating cylinder 18, communicating with the guide cavity 20 through a flow port 21. That is, a guide pipe 22 extending into the opening of the rotating cylinder 18 is fixed at the top of the rotating cylinder 18. The flow port 21 communicating with the guide cavity 20 is located near the bottom of the guide pipe 22. The spiral adapter seat 11 is sleeved on the guide pipe 22 and is adapted to the spiral channel 23 on the guide pipe 22. A lubricating material (such as lubricant) is provided on the inner wall of the spiral channel 23. The resistance reduction between the spiral adapter seat 11 and the spiral channel 23 can be achieved by periodically adding lubricating material to the spiral channel 23.

[0038] In this embodiment of the invention, as Figure 6 As shown, the dual-medium delivery assembly 6 includes a hollow guide ring 24. A rotary joint 25 is rotatably connected to the bottom of the hollow guide ring 24 via a diverter pipe. The rotary joint 25 is rotatably connected to the corresponding guide pipe 22. That is, the diverter pipe is fixed to the bottom of the hollow guide ring 24 and communicates with the inner cavity of the hollow guide ring 24. The rotary joint 25 is rotatably connected to both the diverter pipe and the guide pipe 22. This rotary joint 25 is a commonly used rotary conductive joint in the prior art, and therefore will not be described in detail.

[0039] The demulsification reaction chamber 3 is fixed with a flow guide 26 and a support frame 27 on opposite sides. The support frame 27 is fixed on one side of the hollow flow guide ring 24, and the flow guide 26 is fixed on the other side of the hollow flow guide ring 24 and they are connected to each other. An emulsion delivery pipe 28 is connected to the flow guide 26. The emulsion delivery pipe 28 is connected to the salt demulsifier storage tank through an external pipe and a pump. Under the action of the external pipe and the pump, the salt demulsifier in the salt demulsifier storage tank can be transported along the emulsion delivery pipe 28 and the flow guide 26 to the inner cavity of the hollow flow guide ring 24. The support frame 27 is provided with a gas delivery pipe 29 that is connected to the hollow flow guide ring 24. The gas delivery pipe 29 is connected to the gas supply pump through an external pipe. The gas delivery pipe 29 is connected from the top of the hollow flow guide ring 24. Solenoid valves 14 are installed on both the emulsion delivery pipe 28 and the gas delivery pipe 29.

[0040] Furthermore, the primary demulsification assembly 7 also includes a main demulsification pipe 30 fixed at the center of the demulsification reaction chamber 3. Several branch demulsification pipes 31 are connected to the circumference of the main demulsification pipe 30, and jet nozzles 8 are installed at the ends of the branch demulsification pipes 31. It should be noted that all branch demulsification pipes 31 are fixedly installed below the lowest submersion elevation of the oil collecting component 33 to ensure that the oil collecting component 33 does not physically interfere with the branch demulsification pipes 31 when sliding up and down along the main demulsification pipe 30. The demulsification reaction chamber 3 is equipped with an emulsion delivery pipe 2 32 that is connected to the main demulsification pipeline 30. The emulsion delivery pipe 2 32 is connected to the acid demulsifier storage tank through an external pipe and a pump. Under the action of the external pipe and the pump, the acid demulsifier in the acid demulsifier storage tank can be transported along the emulsion delivery pipe 2 32 to the inner cavity of the main demulsification pipeline 30. The acid demulsifier entering the main demulsification pipeline 30 is dispersed into each demulsification branch pipeline 31 and sprayed out by the jet nozzle 8 to form an acid demulsifier fluid.

[0041] The solenoid valve 14 on the inlet pipe 12 is controlled to open, and the wastewater is transported to the demulsification reaction tank 3 through the inlet pipe 12 until the set liquid level is reached. After the wastewater is injected, a certain amount of acid demulsifier is transported to the wastewater in the demulsification reaction tank 3 in a radial form through the emulsion delivery pipe 2 32, the main demulsification pipe 30, the demulsification branch pipe 31 and the jet nozzle 8. During this process, the spiral adapter seat 11 is controlled to move up and down reciprocally by each electric actuator 10. Under the transmission action of the spiral adapter seat 11 and the spiral channel 23, the rotating cylinder 18 at the four corners of the demulsification reaction box 3 is synchronously reciprocated at low speed (initially, the dispersion hole on the rotating cylinder 18 is located outside the corresponding arc-shaped cover plate 4, and the fluid reflector plate 19 is located inside the corresponding arc-shaped cover plate 4. When the spiral adapter seat 11 moves upward to the highest position, the rotating cylinder 18 rotates 270°. When the rotating cylinder 18 rotates between 180° and 270°, the fluid reflector plate 19 located outside the arc-shaped cover plate 4 can reflect the sprayed fluid. During the downward movement and reset of the spiral adapter seat 11, the rotating cylinder 18 begins to rotate in the opposite direction). During the rotation of the rotating drum 18, when the acid demulsifier fluid ejected from the jet nozzle 8 comes into contact with the fluid reflector plate 19 on the rotating drum 18, the rotating fluid reflector plate 19 changes the reflected flow direction of the acid demulsifier fluid in real time, thereby making the acid demulsifier delivered to the demulsification reaction tank 3 fully dispersed to different positions in the demulsification reaction tank 3, so as to achieve a full mixing and demulsification reaction between the acid demulsifier and the wastewater.

[0042] During the synchronous reciprocating rotation of each rotating cylinder 18, the solenoid valve 14 on the emulsion delivery pipe 28 is opened, and a certain amount of salt demulsifier is delivered to the hollow guide ring 24 through the emulsion delivery pipe 28 and the guide frame 26. The salt demulsifier entering the hollow guide ring 24 flows into the guide cavity 20 along each branch pipe, rotary joint 25, guide pipe 22 and flow port 21. The salt demulsifier is then dispersed into the wastewater in a radial form through several dispersion holes on the rotating cylinder 18. The salt demulsifier fluid radiated from the dispersion holes on the rotating cylinder 18 is fully diffused in all directions under the turbulence of the acid demulsifier fluid sprayed from the jet nozzle 8. The salt demulsifier breaks down the emulsion double layer in the wastewater, causing oil droplets to aggregate and float to the surface to form floating oil. This achieves demulsification and stratification of oily wastewater (two-stage demulsification treatment). Thus, the demulsification reaction effect of edible oil refining wastewater can be improved through the joint demulsification reaction of acid demulsifier and salt demulsifier. After the salt demulsifier is delivered and dispersed into the wastewater, the solenoid valve 14 on the emulsion delivery pipe 28 is closed, and then the solenoid valve 14 on the air delivery pipe 29 is opened. Air is delivered to the hollow guide ring 24 through the air delivery pipe 29. At this time, the initial high-pressure airflow is used to purge and empty the residual salt demulsifier in the hollow guide ring 24, the guide cavity 20, and each dispersion hole, to prevent the residual salt liquid from crystallizing and adhering in the channel and causing system blockage. After purging, the air is continuously circulated, and finally discharged along several dispersion holes on each rotating cylinder 18 to form fine bubbles that disperse into the wastewater after the demulsification reaction. After the demulsification reaction, the air flotation treatment further ensures the emulsified oil floats, thus improving the flotation efficiency of the emulsified oil after the demulsification reaction. As a preferred industrial application ratio, in this embodiment, the volume ratio of wastewater input into the demulsification reaction tank 3 to the volume of acid demulsifier (such as 5%-10% dilute sulfuric acid by mass) and salt demulsifier (such as 10%-15% calcium chloride solution by mass) can be controlled at 1000:(1-3):(2-5). Specifically, it can be finely adjusted according to the saponification rate of alkaline soap residue in the wastewater to ensure the best demulsification and destabilization effect.

[0043] Example 2, based on Example 1, such as Figure 3 and Figure 6As shown, the primary oil removal component 9 includes an oil collection component 33 sleeved on the demulsification main pipe 30 (after the wastewater is transported inside the demulsification reaction tank 3, the bottom of the oil collection component 33 is close to the water surface, so that the oil collection component 33 can be lowered below the water surface in the future, and the demulsification branch pipe 31 will not interfere with the movement of the oil collection component 33 during the entire process of the oil collection component 33 moving up and down). An oil collection pipe 34 is fixed on the periphery of the oil collection component 33 and communicates with the oil collection chamber at its top. An electric push rod 10 is installed on the top of the demulsification reaction tank 3. The support plate 35 fixed on the periphery of the oil collection component 33 is connected to the corresponding electric push rod 10. During the demulsification reaction, the oil collection component 33 is above the wastewater surface under the action of the corresponding electric push rod 10, ensuring that the wastewater or floating oil during the demulsification reaction cannot enter the oil collection chamber at the top of the oil collection component 33.

[0044] An oil guide pipe 36 is fixed at the bottom of the demulsification reaction chamber 3. An oil drain pipe 37 is connected to the periphery of the oil guide pipe 36 near the bottom and passes through the demulsification reaction chamber 3. The oil drain pipe 37 is connected to the oil collection tank through an external pipe, so that the oil discharged from the oil guide pipe 36 and the oil drain pipe 37 is discharged into the oil collection tank for collection. A piston 38 that slides inside the oil guide pipe 36 is fixed to the outer wall of the oil collection pipe 34. The oil collection part is composed of an oil collection component 33, an oil collection pipe 34 and a piston 38. The oil discharge section consists of an oil guide pipe 36 and an oil discharge pipe 37. During the entire demulsification reaction, the oil collecting component 33 is positioned above the wastewater surface under the action of the corresponding electric push rod 10, and the piston component 38 is located inside the oil guide pipe 36. After the wastewater demulsification reaction is completed and the set time is set, the oil collecting component 33 is lowered to the designated position by the electric push rod 10 and the support plate 35, so that the oil collecting chamber at the top of the oil collecting component 33 is below the wastewater surface (submerged to a depth of 2-3 cm in the wastewater). At this time, the floating oil accumulated on the surface of the wastewater flows by gravity into the oil collection chamber at the top of the oil collection component 33, and is discharged into the oil collection tank along the oil collection pipe 34, the oil guide pipe 36 and the oil discharge pipe 37 to achieve collection. If a small amount of floating oil still exists on the surface of the wastewater after a single oil discharge, the oil collection chamber at the top of the oil collection component 33 is lowered below the surface of the wastewater to complete the oil discharge treatment again. In order to improve the aggregation of floating oil near the oil collection component 33 during the oil discharge process, airflow can be transported into the demulsification reaction tank 3 through the dispersion holes on each rotating cylinder 18 to form bubbles. As the tiny bubbles rise, they use surface tension to adsorb the emulsified oil droplets in the wastewater, forming oil-gas flocs with lower density to accelerate the rise. At the same time, as the bubbles are released from the surrounding edges to the surface of the liquid, the central oil collection component 33 area forms a relatively low-pressure convergence zone due to the absence of obvious airflow disturbance. Based on the guidance of liquid surface hydrodynamics, the floating oil on the edge will be continuously pushed and converged to the oil collection component 33 to improve the oil discharge efficiency and effect.

[0045] Example 3, based on Examples 1 and 2, as follows: Figure 9 and Figure 10As shown, the secondary oil removal system 2 includes a wastewater transfer tank 39 connected to the demulsification reaction tank 3 via a support frame. A drain pipe is provided at the lower position of the wastewater transfer tank 39, which is connected to the wastewater tank of the downstream treatment process. Wastewater in the wastewater transfer tank 39 is discharged into the wastewater tank of the downstream treatment process through the drain pipe. A secondary oil collection tank 40 is installed on one side of the wastewater transfer tank 39. The bottom of the secondary oil collection tank 40 is connected to the oil collection tank through an oil guide pipe. The wastewater transfer tank 39 and the secondary oil collection tank 40 are connected through an installation port. An inclined oil scraper 41 penetrating the installation port is provided inside the secondary oil collection tank 40. An electric push rod 10 connected to the inclined oil scraper 41 is provided on one side of the secondary oil collection tank 40. The oil scraped off by the inclined oil scraper 41 flows into the secondary oil collection tank 40 through the outlet at its bottom.

[0046] Furthermore, the output end of the drive motor 42 installed on the other side of the sewage transfer box 39 is connected to a support shaft 43. A connecting frame 44 fixedly sleeved on the support shaft 43 is fixed with a perforated mounting cylinder 45. The connecting frame 44 and the support shaft 43 are detachably connected by fasteners. One end of the perforated mounting cylinder 45 is fixed with a support ring 46 that rotates with the inner wall of the limiting ring 16. That is, when the support ring 46 is inserted into the limiting ring 16, the limiting ring 16 supports the support ring 46 and the perforated mounting cylinder 45. The perforated mounting cylinder 45 is located inside the arc-shaped drainage cover 15 and its outer wall is used to cover an oil-absorbing and hydrophobic cloth. The oil-absorbing and hydrophobic cloth is made of oil-absorbing material commonly used in the prior art (such as modified polypropylene microfiber material). This is prior art and will not be described in detail.

[0047] Initially, the connecting frame 44 is slidably sleeved on the support shaft 43 and close to the drive motor 42. When the cylindrical oil-absorbing and hydrophobic cloth is tightly fitted onto the outer wall of the porous mounting cylinder 45 from one side of the support ring 46, the porous mounting cylinder 45 is moved along the support shaft 43 so that the locking hole on the connecting frame 44 aligns with the locking groove on the support shaft 43. The entire porous mounting cylinder 45 is fixed at the front end of the support shaft 43 by fastening the fasteners between the locking hole and the locking groove. At this time, the support ring 46 at the front end of the porous mounting cylinder 45 fits perfectly inside the limiting ring 16. Then, the inclined oil scraper 41 is moved by the electric actuator 10 until the oil scraping end of the inclined oil scraper 41 abuts against the surface of the oil-absorbing and hydrophobic cloth on the porous mounting cylinder 45.

[0048] After the solenoid valve 14 on the outlet pipe 13 is opened (and the drive motor 42 is simultaneously turned on to control the porous mounting cylinder 45 to rotate at a set speed, the rotation direction of the porous mounting cylinder 45 being opposite to the flow direction of the wastewater in the arc-shaped drainage cover 15), the wastewater at the bottom of the demulsification reaction tank 3 flows into the inner cavity of the arc-shaped drainage cover 15 along the outlet pipe 13. The wastewater entering the arc-shaped drainage cover 15 gradually flows downward along its inner wall, and the arc-shaped drainage cover 15 and the oil-absorbing and hydrophobic cloth achieve the guiding effect of the flowing wastewater, so that the wastewater flows along the inner wall of the arc-shaped drainage cover 15 and the oil-absorbing and hydrophobic cloth and flows out from the drainage outlet 17. A small amount of floating oil or emulsified oil in the wastewater is absorbed by the oil-absorbing and hydrophobic cloth during the diversion process. The oil-absorbing and hydrophobic cloth, which rotates synchronously with the porous mounting cylinder 45, is scraped off by the inclined oil scraper 41 under the action of the inclined oil scraper 41 and flows onto the inclined oil scraper 41. It then flows along the inclined oil scraper 41 into the secondary oil collection tank 40 to complete the collection.

[0049] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0050] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A wastewater treatment device for crude oil refining, characterized in that, It includes a multi-stage demulsification system (1) and a secondary oil removal system (2) located at the bottom of the multi-stage demulsification system (1). The secondary oil removal system (2) is configured to receive the drainage from the bottom of the multi-stage demulsification system (1) and perform secondary oil removal. The multi-stage demulsification system (1) includes: The demulsification reaction chamber (3) has an arc-shaped cover plate (4) fixed at the four corners inside, with the opening end of the arc-shaped cover plate (4) facing the axis of the demulsification reaction chamber (3); The lifting and rotating part is located on the periphery of the demulsification reaction box (3) and corresponds one-to-one with the arc-shaped cover plate (4). The arc-shaped cover plate (4) is equipped with a secondary demulsification assembly (5) which rotates inside. The lifting and rotating part is configured to drive the secondary demulsification assembly (5) to rotate back and forth. A dual-media delivery assembly (6) is located above the demulsification reaction chamber (3) and is rotatably connected to each secondary demulsification assembly (5). It is configured to deliver salt demulsifier or air through the secondary demulsification assembly (5). The primary demulsification assembly (7) includes jet nozzles (8) that correspond one-to-one with the secondary demulsification assembly (5). The secondary demulsification assembly (5) is configured to change the flow direction of the acid demulsifier sprayed from the jet nozzles (8). The primary oil removal component (9) is located inside the demulsification reaction chamber (3) and includes an oil collection section and an oil discharge section. One end of the oil discharge section extends to the outside of the demulsification reaction chamber (3), and the oil collection section is connected to the oil discharge section and the two are slidably engaged.

2. The wastewater treatment device for crude oil refining as described in claim 1, characterized in that, The demulsification reaction chamber (3) is equipped with an electric push rod (10) on its periphery. The output end of the electric push rod (10) is connected to a spiral adapter seat (11). The lifting and rotating part is composed of the electric push rod (10) and the spiral adapter seat (11).

3. The wastewater treatment device for crude oil refining as described in claim 1, characterized in that, The demulsification reaction box (3) is equipped with an inlet pipe (12) and an outlet pipe (13) on its periphery. The inlet pipe (12) is set close to the top of the demulsification reaction box (3), and the outlet pipe (13) is set close to the bottom of the demulsification reaction box (3). Solenoid valves (14) are installed on both the inlet pipe (12) and the outlet pipe (13). The end of the water outlet pipe (13) is connected to an arc-shaped drainage cover (15). The arc-shaped drainage cover (15) is fixed with a limit ring (16) on the side near the demulsification reaction box (3). The arc-shaped drainage cover (15) has a hollow structure inside and a drainage outlet (17) is opened on its inner wall. The drainage outlet (17) and the limit ring (16) are coaxially arranged.

4. The wastewater treatment device for crude oil refining as described in claim 2, characterized in that, The secondary demulsification assembly (5) includes a rotating cylinder (18) that fits against the inner wall of the arc-shaped cover plate (4). A fluid reflector plate (19) is fixed inside the opening side of the rotating cylinder (18). Several dispersion holes are arranged on the circumferential side of the rotating cylinder (18) and communicate with the internal guide cavity (20). A guide pipe (22) that communicates with the guide cavity (20) through the flow port (21) is fixed on the top of the rotating cylinder (18). A spiral adapter seat (11) is sleeved on the guide pipe (22) and is adapted to the spiral channel (23) on the guide pipe (22).

5. The wastewater treatment device for crude oil refining as described in claim 4, characterized in that, The dual-medium delivery assembly (6) includes a hollow guide ring (24), and a rotary joint (25) is rotatably connected to the bottom of the hollow guide ring (24) through a diverter pipe. The rotary joint (25) is rotatably connected to the corresponding guide pipe (22). The demulsification reaction chamber (3) is fixed with a flow guide (26) and a support frame (27) on opposite sides respectively. The support frame (27) is fixed on one side of the hollow flow guide ring (24), and the flow guide (26) is fixed on the other side of the hollow flow guide ring (24) and they are connected to each other. An emulsion delivery pipe (28) is connected to the flow guide (26), and a gas delivery pipe (29) connected to the hollow flow guide ring (24) is provided on the support frame (27). Solenoid valves (14) are installed on both the emulsion delivery pipe (28) and the gas delivery pipe (29).

6. The wastewater treatment device for crude oil refining as described in claim 1, characterized in that, The primary demulsification assembly (7) also includes a demulsification main pipe (30) fixed at the center of the demulsification reaction box (3). Several demulsification sub-pipes (31) are connected to the periphery of the demulsification main pipe (30). A jet nozzle (8) is installed at the end of the demulsification sub-pipe (31). An emulsion delivery pipe (32) connected to the demulsification main pipe (30) is installed on the demulsification reaction box (3).

7. The wastewater treatment device for crude oil refining as described in claim 6, characterized in that, The primary oil removal assembly (9) includes an oil collection component (33) sleeved on the demulsification main pipe (30), an oil collection pipe (34) connected to the oil collection chamber at its top is fixed on the periphery of the oil collection component (33), an electric push rod (10) is installed on the top of the demulsification reaction box (3), and a support plate (35) fixed on the periphery of the oil collection component (33) is connected to the corresponding electric push rod (10). The bottom of the demulsification reaction chamber (3) is fixed with an oil guide pipe (36). The side of the oil guide pipe (36) is connected to the bottom and has an oil drain pipe (37) that penetrates the demulsification reaction chamber (3). The outer wall of the oil collection pipe (34) is fixed with a piston (38) that slides in the oil guide pipe (36). The oil collection part is composed of an oil collection part (33), an oil collection pipe (34) and a piston (38). The oil discharge part is composed of an oil guide pipe (36) and an oil discharge pipe (37).

8. The wastewater treatment device for crude oil refining as described in claim 3, characterized in that, The secondary oil removal system (2) includes a sewage transfer box (39) connected to the demulsification reaction box (3) via a support frame. A secondary oil collection box (40) is installed on one side of the sewage transfer box (39). The sewage transfer box (39) and the secondary oil collection box (40) are connected through an installation port. The secondary oil collection box (40) is provided with an inclined oil scraper (41) that passes through the installation port. An electric push rod (10) connected to the inclined oil scraper (41) is provided on one side of the secondary oil collection box (40).

9. The wastewater treatment device for crude oil refining as described in claim 8, characterized in that, The output end of the drive motor (42) installed on the other side of the sewage transfer box (39) is connected to a support shaft (43). A multi-hole mounting cylinder (45) is fixed on the connecting frame (44) fixed on the support shaft (43). One end of the multi-hole mounting cylinder (45) is fixed with a support ring (46) that rotates with the inner wall of the limiting ring (16). The multi-hole mounting cylinder (45) is located inside the arc-shaped drainage cover (15) and its outer wall is used to cover the oil-absorbing and water-repellent cloth.

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