An oily wastewater treatment system for oil sands processing plants

Abstract

The present application belongs to the technical field of oily sewage treatment, and specifically discloses an oily sewage treatment system for an oil sand oil treatment station, which comprises a first treatment pool, a second treatment pool and a high-temperature ethylene glycol main pipe, the two pools are connected through a connecting pipe with a sand filtering assembly, a cover is arranged on the top of the pool body, a screw pump is installed on the cover of the second treatment pool through a support, the rotor and the stator of the screw pump extend into the pool, an oil liquid inlet pipe is connected to the first treatment pool, an inclined sand screening plate is arranged in the first treatment pool, high-temperature ethylene glycol coils are arranged on the bottom of the two pools, the coils are connected with the high-temperature ethylene glycol main pipe and have a gap with the bottom of the pool, and a loading sewage discharge pipe is further arranged in the pool. The present application is aimed at the problem that the existing sewage discharge pool is prone to freezing and solidification of oil liquid in a low-temperature environment, thereby affecting secondary treatment. In the present application, the sewage enters the first treatment pool through the oil liquid inlet pipe, the sand screening plate is used to preliminarily remove sand, the oil liquid enters the second treatment pool through the connecting pipe after sand filtering, the high-temperature ethylene glycol heats the sewage through the coils, thereby reducing the viscosity of the oil liquid and preventing freezing, and the screw pump is used to extract and recycle the oil liquid.

Description

Technical Field

[0001] This invention relates to the field of oily wastewater treatment technology, and more specifically to an oily wastewater treatment system for an oil sands treatment plant. Background Technology

[0002] Oil sands are an unconventional petroleum resource, also known as "tar sands," "heavy oil sands," or "bitumen sands." They are sandstones impregnated with heavy petroleum and are products of bituminous crude oil losing its lighter components during migration. They are characterized by high density, high viscosity, high carbon-to-hydrogen ratio, and high metal content.

[0003] After processing, the oil sands oil is separated and sent to the oil collection area. The oil sands oil in the collection area then undergoes dehydration and purification at the oil sands oil treatment station. The workflow is as follows: The oil sands oil in the collection area first enters the steam processor, where it undergoes a thermal cracking reaction. The gas phase is vented via a flare, while the liquid phase, after passing through a low-temperature ethylene glycol heat exchanger, enters the pre-dehydration separator. The pre-dehydration separator separates the oil from the produced water. The oil is then treated by a thermochemical separator before entering the purified oil tank, while the produced water is piped to a high-temperature oil separator for further treatment. During this process, wastewater discharged from the steam processor and the pre-dehydration separator enters a sludge tank via pipeline. This wastewater contains water, oil, and a small amount of sand. After sedimentation in the sludge tank, the oil floating on the surface is pumped by a screw pump to the pre-dehydration separator for secondary treatment.

[0004] However, in low-temperature environments, the sewage in the sewage tank is prone to oil solidification, and the water in the sewage is also prone to freezing to form an ice layer. The screw pump has difficulty extracting the floating oil, which makes it impossible to transport the oil to the pre-dehydration separator for secondary treatment. Summary of the Invention

[0005] The purpose of this invention is to provide an oily wastewater treatment system for oil sands processing plants to solve the problem that oil is prone to freezing or solidification in low-temperature environments, which affects the secondary treatment of oil.

[0006] To achieve the above objectives, the basic solution provided by this invention is as follows: an oily wastewater treatment system for an oil sands processing station, comprising a first treatment tank, a second treatment tank, and a high-temperature ethylene glycol main pipe. Several connecting pipes connect the first and second treatment tanks, and each connecting pipe is detachably connected to a sand filter assembly. Both the first and second treatment tanks are equipped with caps. An oil inlet pipe connects to one side of the first treatment tank. A sand screening plate is installed inside the first treatment tank, with its bottom fixedly connected to the bottom of the first treatment tank. The sand screening plate is inclined, with the side of the sand screening plate closer to the oil inlet pipe higher than the other side. The first and second treatment tanks... Each tank is equipped with several loading and unloading sewage pipes. The bottom of each loading and unloading sewage pipe extends to the bottom of the first treatment tank and the second treatment tank. The bottom of the first treatment tank and the second treatment tank is covered with a high-temperature ethylene glycol coil. The outlet end of the high-temperature ethylene glycol main pipe is connected to the inlet end of the high-temperature ethylene glycol coil. The outlet end of the high-temperature ethylene glycol coil extends to the outside of the first treatment tank. A gap is left between the bottom of the high-temperature ethylene glycol coil and the bottom of the first treatment tank and the second treatment tank. The top of the cover is equipped with a bracket. The bracket is located on the second treatment tank. A screw pump is mounted on the bracket. The screw rotor and rubber stator of the screw pump extend through the cover into the second treatment tank.

[0007] The working principle of this invention is as follows: In use, wastewater containing oil, water, and sand first enters the first treatment tank through the oil inlet pipe for sedimentation. As the liquid level rises, the oil and a small amount of sand overflow from the highest point of the sand sieve plate. The sand in the oil slides down the inclined sand sieve plate under gravity and is retained by the barbs on the sand sieve plate, while the oil continues to flow downwards, achieving secondary separation of sand and oil. Then, the liquid level between the first treatment tank and the side wall near the second treatment tank continues to rise. Subsequently, the oil enters the second treatment tank through the connecting pipe. During this process, the sand is filtered by the sand filter assembly in the connecting pipe. At the same time, high-temperature ethylene glycol in the high-temperature ethylene glycol main pipe enters the high-temperature ethylene glycol coil. The high-temperature ethylene glycol coil releases heat to the wastewater in the tank, reducing the viscosity of the oil and making it easier for the oil to float. At the same time, it prevents the wastewater from freezing or the oil from solidifying in low-temperature environments, ensuring stable operation of the system. The ethylene glycol after heat exchange is discharged through the coil outlet, completing the circulation.

[0008] The beneficial effects of this invention are as follows: ① The sedimentation of sand in the oil is achieved through the first and second treatment tanks. At the same time, high-temperature ethylene glycol coils are laid at the bottom of the first and second treatment tanks. The heat of the high-temperature ethylene glycol is used to heat the oil in the tanks. On the one hand, this can reduce the viscosity of the oil, making it easier for the oil to float and improving the oil recovery efficiency. On the other hand, it can prevent the oil from freezing or solidifying in low-temperature environments. At the same time, a gap is left between the bottom of the coil and the bottom of the tank to avoid affecting the flow direction of the sand when the loading pipeline sucks up the sand. ② The inclined sand screening plate in the first treatment tank can perform preliminary sand screening treatment on the incoming sewage. The sand in the oil is retained by the barbs on the sand screening plate under the action of gravity, and the oil continues to flow downward, realizing the separation of sand and oil.

[0009] Option 2, a preferred embodiment of the basic option, features an overrunning clutch I on the motor shaft of the screw pump. The motor shaft is fixedly connected to the inner ring of the overrunning clutch I, and the screw rotor is fixedly connected to the outer ring of the overrunning clutch I. A base is provided on the cover, and a rotating shaft II is rotatably connected between the base and the bracket. An overrunning clutch II is provided on the rotating shaft II. Gears I and II are respectively provided on the outer circumferences of the overrunning clutch I and overrunning clutch II, and the gears I and II mesh. A drive assembly for driving the rotating shaft II to rotate is provided on the cover. During operation, the rubber stator is immersed in oil for a long time, causing changes in its expansion degree, which can easily cause it to seize with the screw rotor. At the same time, residual oil adhering between the rubber stator and the screw rotor increases the resistance between them. When the screw pump (a 15-frequency fixed-frequency single screw pump) starts, the instantaneous load during startup increases, which can easily damage the entire screw pump. By setting up overrunning clutch one, overrunning clutch two, and drive components, the screw rotor is pre-rotated, reducing the residual oil resistance between the rotor and stator before startup, lowering the instantaneous load at startup, effectively preventing the screw pump from being damaged due to excessive load, and extending its service life.

[0010] Option 3, a preferred embodiment of Option 2, includes a drive assembly comprising a cavity connected to a high-temperature ethylene glycol main pipe. The main pipe is connected to a high-temperature ethylene glycol branch pipe, with its inlet and outlet located on opposite sides of the cavity. Two electrically operated shut-off valves are installed at either end of the branch pipe. A rotating shaft is laterally rotatably connected within the cavity, with a worm gear blade at one end. Two fixed seats are provided on the cover. A worm gear is fixedly connected to one end of the rotating shaft and rotatably connected to the fixed seats. A worm wheel is mounted on the rotating shaft and meshes with the worm gear. Utilizing the pressure potential energy of the high-temperature ethylene glycol, the glycol enters the cavity, driving the worm gear blade to rotate. This, in turn, drives the screw rotor to pre-rotate via a transmission structure. By utilizing the existing energy of the high-temperature ethylene glycol, no additional power is required, achieving energy saving.

[0011] Option 4, a preferred option of Option 3, has an electric throttle valve at one end of the high-temperature ethylene glycol main pipe near the cavity inlet. The screw pump is electrically connected to a PLC controller and a relay. The electric throttle valve, electric shut-off valve one, and electric shut-off valve two are all electrically connected to the PLC controller and the relay. The electric throttle valve is controlled by the PLC controller and the relay to change its opening from large to small, thus providing a gradually increasing starting force to the screw rotor.

[0012] Option 5, a preferred embodiment of the basic option, includes a motor, a gearbox, and a fixed base 2 on the cover. The motor is connected to the high-speed shaft of the gearbox. A rotating shaft 3 is rotatably connected to the fixed base 2. The low-speed shaft of the gearbox is connected to the rotating shaft 3. A gear 3 is mounted on the rotating shaft 3. A rotating shaft 4 is rotatably connected to the side wall of the second treatment tank. A loop rod is mounted on the rotating shaft 4. A gear 4 is mounted on the end of the rotating shaft 4 extending outside the second treatment tank. A chain 1 meshes between the gear 3 and the gear 4. The motor drives the rotating shaft 4 to rotate through the gearbox and other transmission structures, stirring the sewage in the tank. This prevents oil from accumulating locally in the tank, allowing the oil to float more evenly for easy extraction by the screw pump. It also prevents the sewage from freezing or the oil from solidifying in low-temperature environments.

[0013] Option 6, a preferred embodiment of Option 5, includes a cylindrical body. Both the inner wall of the connecting pipe and the outer wall of the cylindrical body are threaded for mutual connection. An annular sleeve is located inside the cylindrical body. Two connecting rods are located on one side of the annular sleeve, and a filter screen is located on the other side. A slider is located at one end of each of the two connecting rods. Two sliding grooves are located on the inner side of the cylindrical body, and each slider is slidably connected to one of the grooves. A crossbar is located on the inner side of the annular sleeve, with one side of the crossbar abutting against the filter screen. Screws for limiting the connecting rods are located in the sliding grooves. The cylindrical body of the sand filter assembly is threadedly connected to the connecting pipe for easy and quick assembly and disassembly. The filter screen inside the cylindrical body effectively filters sand.

[0014] Option 7, a preferred embodiment of Option 6, features a fixed base 3 and a fixed base 4 on the cover. A worm gear 2 is rotatably connected to fixed base 3, with a gear 5 extending through one end of the worm gear 2 and a gear 6 extending through one end of the fixed base 2. A chain 2 meshes between gears 5 and 6. A rotating shaft 5 is rotatably connected to fixed base 4, with a turbine 2 and a cam mounted on it. The turbine 2 meshes with the worm gear 2. The cover has a strip-shaped groove extending into the thick wall of one side of the second treatment tank. A sliding plate is slidably connected within the strip-shaped groove, with the cam positioned directly above it. A spring 1 is located between the sliding plate and the strip-shaped groove. The bottom of the strip-shaped groove has a through-slot corresponding to the connecting pipe. A spiral scraper for scraping sand from the filter screen surface is slidably connected within each through-slot, with one end of the spiral scraper connected to the bottom of the sliding plate. Each of the connecting pipes has an opening at its bottom. Below the opening, a long groove is formed within the thick wall of the second treatment tank. The inner diameter of the opening is smaller than the inner diameter of the long groove. A sealing cover is slidably connected within the long groove. A protrusion is provided within the long groove, and several springs are positioned between the protrusion and the bottom of the sealing cover. The long groove is connected to a drain pipe, which is connected to the first treatment tank. A motor drives gears five and six, a chain, a worm gear, a turbine, and a cam, causing the cam to push a sliding plate up and down. This, in turn, causes a circular scraper to slide on the filter screen, automatically scraping away sand from the screen surface to prevent clogging and ensure the unobstructed flow of the connecting pipes, eliminating the need for frequent manual cleaning. Simultaneously, the circular scraper, while running, presses the sealing cover downwards, causing the scraped sand to fall through the opening into the long groove and back into the first treatment tank via the drain pipe. The sealing cover automatically resets and seals under the action of the springs.

[0015] Option 8, a preferred embodiment of Option 5, has a gear 7 at the end of the rotating shaft 4 away from gear 4. The second processing pool is rotatably connected to a rotating shaft 6 located on one side of gear 7. Gear 8 is mounted on the rotating shaft 6, and gears 7 and 8 mesh. The second processing pool is rotatably connected to a rotating shaft 7 located on one side of gears 7 and 8. Gears 9 and 11 are mounted on the rotating shaft 7. Pins are provided on gears 7 and 8 for meshing with gear 9 to rotate it forward and backward. A screw is rotatably connected inside the second processing pool. Gear 10 is mounted at the end of the screw extending outside the second processing pool. A chain 3 meshes between gears 10 and 11. A slider 2 is threaded onto the screw. The bottom of slider 2... The unit is equipped with a fixed rod, one end of which is equipped with a rake-shaped scraper. The rake-shaped scraper is slidably connected to the sand screening plate. The sand screening plate has chutes on both sides, each chute being higher than the sand screening plate. The bottom of each chute has a circular groove for sand accumulation, and the loading and drain pipe is located in the circular groove. Through a series of gear transmissions and pin actions, the screw rotates in both directions, driving the slider and the rake-shaped scraper to move back and forth on the sand screening plate, scraping the sand on the sand screening plate into the chutes, and finally into the circular groove, thus preventing sand from accumulating on the sand screening plate and affecting the sand screening effect. The circular groove facilitates the concentrated accumulation of sand, and the location of the loading and drain pipe in the circular groove facilitates the subsequent loading and processing of sand, improving the convenience of sand processing.

[0016] Option 9, which is a preferred option of the basic option, has a sloping bottom for the first and second treatment pools. With the bottom of the first and second treatment pools sloping, the sand at the bottom of the pools will gather towards the bottom of the slope under the action of gravity, which facilitates the centralized cleaning and collection of sand, reduces the situation of sand being dispersed and deposited in various places at the bottom of the pools, and reduces the difficulty of cleaning.

[0017] Option 10, which is a preferred embodiment of Option 5, involves a number of rotating shafts 8 fixedly connected between the rotating shaft 4 and the loop rod, with an S-shaped fan blade rotatably connected to each rotating shaft 8. When the S-shaped fan blade between the rotating shaft 4 and the loop rod rotates with the rotating shaft 4, it can more fully stir the sewage in the second treatment tank. Compared with ordinary blades, the S-shaped structure can enhance the turbulence of stirring, making it easier to separate oil and water and making the oil float more evenly. Attached Figure Description

[0018] Figure 1 This is a perspective view of an oily wastewater treatment system for an oil sands processing station according to the present invention;

[0019] Figure 2 This is a partial cross-sectional view of an oily wastewater treatment system for an oil sands processing station according to the present invention.

[0020] Figure 3 for Figure 2 3D images when rotated 90° to the left and 30° upwards respectively;

[0021] Figure 4 for Figure 2 A 3D view when rotated 190° to the left;

[0022] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0023] Figure 6 This is a left view of an oily wastewater treatment system for an oil sands processing station according to the present invention;

[0024] Figure 7 This is a top view of an oily wastewater treatment system for an oil sands processing station according to the present invention;

[0025] Figure 8 for Figure 7 Sectional view at CC;

[0026] Figure 9 for Figure 8 Enlarged view at point D;

[0027] Figure 10 for Figure 7 Sectional view at point BB;

[0028] Figure 11 This is a perspective view of the rotating shaft four in an oil sands wastewater treatment system of the present invention.

[0029] Figure 12 This is a partial sectional view of a screw pump in an oily wastewater treatment system of an oil sands processing station according to the present invention. Detailed Implementation

[0030] The present invention will be further described in detail below through specific embodiments:

[0031] The reference numerals in the accompanying drawings include: 1. First treatment tank; 101. Oil inlet pipe; 102. Loading and drain pipe; 103. High-temperature ethylene glycol coil; 104. Screening plate; 2. Second treatment tank; 3. Connecting pipe; 301. Cylinder; 302. Crossbar; 303. Slide groove; 304. Connecting rod; 305. Sliding block one; 306. Annular sleeve; 307. Filter screen; 308. Screw; 4. Cover; 401. Bracket; 5. Screw pump; 501. Screw rotor; 502. Rubber stator; 503. 504. Motor shaft; 505. Overrunning clutch one; 506. High-temperature ethylene glycol main pipe; 507. Cavity; 508. High-temperature ethylene glycol branch pipe; 509. Electric throttle valve; 510. Electric shut-off valve one; 511. Electric shut-off valve two; 512. Rotating shaft one; 513. Worm gear blade; 514. Fixed base one; 515. Worm one; 516. Base; 517. Rotating shaft two; 518. Worm gear one; 519. Overrunning clutch two; 520. Gear one; 521. Gear two; 602. Motor; 603. Gearbox; 603. Mounting base two; 604. Shaft three; 605. Gear three; 606. Shaft four; 607. Retractor; 608. Gear four; 609. Chain one; 610. Shaft eight; 611. S-shaped fan blade; 701. Mounting base three; 702. Mounting base four; 703. Worm gear two; 704. Gear five; 705. Gear six; 706. Chain two; 707. Shaft five; 708. Turbine two; 709. Cam; 710. Slot; 711. Slide plate; 712. Spring one 713. Through groove; 714. Recurved scraper; 715. Long strip groove; 716. Sealing cap; 717. Protrusion; 718. Spring II; 719. Pipeline; 801. Gear VII; 802. Shaft VI; 803. Gear VIII; 804. Shaft VII; 805. Gear IX; 806. Pin; 807. Screw; 808. Gear X; 809. Chain III; 810. Slider II; 811. Fixing rod; 812. Rake-shaped scraper; 813. Chute; 814. Circular groove; 815. Gear XI.

[0032] like Figures 1 to 12The system depicts an oily wastewater treatment system for an oil sands processing plant, comprising a first treatment tank 1, a second treatment tank 2, an overrunning clutch 504, and a high-temperature ethylene glycol main pipe 505. Several connecting pipes 3 connect the first treatment tank 1 and the second treatment tank 2. The bottoms of the first and second treatment tanks are sloping. Both the first and second treatment tanks 1 and 2 are covered with a cover 4. A bracket 401 is fixedly connected to the top of the cover 4 on the second treatment tank 2. A screw pump 5, a vertical single-screw pump, is fixedly connected to the bracket 401. The screw rotor 501 and rubber stator 502 of the screw pump 5 extend through the cover 4 into the second treatment tank 2. The motor shaft 503 of the screw pump 5 is fixedly connected to the inner ring of the overrunning clutch 504, and the screw rotor 501 of the screw pump 5 is fixedly connected to the outer ring of the overrunning clutch 504. The pressure of high-temperature ethylene glycol in the high-temperature ethylene glycol main pipe 505 is 0.5-1.0 MPa. 505 is connected to cavity 506 and high-temperature ethylene glycol branch pipe 507. The inlet and outlet of high-temperature ethylene glycol branch pipe 507 are located on both sides of cavity 506. An electric throttle valve 508 is installed at the end of high-temperature ethylene glycol main pipe 505 near the inlet of cavity 506. Electric shut-off valve 1 509 and electric shut-off valve 2 510 are installed at both ends of high-temperature ethylene glycol branch pipe 507, respectively. Screw pump 5 is electrically connected to PLC controller and relay. The delay time of relay is 30 seconds. Electric throttle valve 508, electric shut-off valve 1 509, and electric shut-off valve 2 510 are all electrically connected to PLC controller and relay. PLC controller and relay are also electrically connected. A rotating shaft 1 511 is laterally rotatably connected inside cavity 506. A worm gear blade 512 is fixedly connected to one end of rotating shaft 1 511 inside cavity 506. A sealing assembly for sealing cavity 506 is provided at the connection between rotating shaft 1 511 and cavity 506. The sealing assembly uses packing seal.The packing seal is existing technology. Two fixed seats 513 are fixedly connected to the cover 4. A worm gear 514 is fixedly connected to one end of a rotating shaft 511, and the worm gear 514 is rotatably connected to the fixed seats 513. A base 515 is fixedly connected to the cover 4. A rotating shaft 516 is rotatably connected between the base 515 and the bracket 401. A worm wheel 517 is fixedly connected to the rotating shaft 516, and the worm wheel 517 meshes with the worm gear 514. An overrunning clutch 518 is fixedly connected to the rotating shaft 516. Overrunning clutches 504 and overrunning clutches are also fixedly connected. 518 is a roller-type overrunning clutch. Overrunning clutch 504 and overrunning clutch 518 are configured in opposite ways. When the inner ring of overrunning clutch 518 drives the outer ring to rotate, gear 520 on overrunning clutch 518 drives gear 519 to rotate. Gear 519 then drives the outer ring of overrunning clutch 504 to rotate. At this time, the inner ring of overrunning clutch 504 does not rotate. Gear 519 and gear 520 are fixedly connected to the circumference of the outer rings of overrunning clutch 504 and overrunning clutch 518, respectively. Gear 2520 meshes. An oil inlet pipe 101 is connected to one side of the first treatment tank 1. Several loading and unloading sewage pipes 102 are connected to both the first and second treatment tanks 1 and 2. The bottom of each loading and unloading sewage pipe 102 extends to the bottom of both the first and second treatment tanks 1 and 2. A filter sand assembly is detachably connected to each connecting pipe 3. The filter sand assembly includes a cylinder 301. Threads for mutual threaded connection are formed on the inner wall of the connecting pipe 3 and the outer wall of the cylinder 301. The connecting pipe 3 and the cylinder 301 are threadedly connected. A ring is fixedly connected inside the cylinder 301. The annular sleeve 306 has two connecting rods 304 fixedly connected to one side, and a filter screen 307 installed on the other side. The filter screen 307 is a rigid circular filter screen. A slider 305 is fixedly connected to one end of each of the two connecting rods 304. Two sliding grooves 303 are opened on the inner side of the cylinder 301, and each slider 305 is slidably connected to a groove 303. A crossbar 302 is fixedly connected to the inner side of the annular sleeve 306, with one side of the crossbar 302 abutting against the filter screen 307. A screw 308 for limiting the connecting rods 304 is threaded into the groove 303.

[0033] High-temperature ethylene glycol coils 103 are laid at the bottom of the first treatment tank 1 and the second treatment tank 2. The outlet end of the high-temperature ethylene glycol main pipe 505 is connected to the inlet end of the high-temperature ethylene glycol coil 103. The outlet end of the high-temperature ethylene glycol coil 103 extends outside the first treatment tank 1. A gap is left between the bottom of the high-temperature ethylene glycol coil 103 and the bottom of the first treatment tank 1 and the second treatment tank 2. A sand screening plate 104 is fixedly connected inside the first treatment tank 1. The bottom of the sand screening plate 104 is fixedly connected to the bottom of the first treatment tank 1. The sand screening plate 104 is inclined and has several barbs for retaining sand. The side of the sand screening plate 104 closest to the oil inlet pipe 101 is higher than the other side.

[0034] A motor 601, a gearbox 602, and a fixed base 603 are installed on the cover 4. The motor 601 is connected to the high-speed shaft of the gearbox 602. A rotating shaft 604 is rotatably connected to the fixed base 603. The low-speed shaft of the gearbox 602 is connected to the rotating shaft 604. A gear 605 is fixedly connected to the rotating shaft 604. A rotating shaft 606 is rotatably connected to the side wall of the second treatment pool 2. A loop rod 607 is fixedly connected to the rotating shaft 606. A gear 608 is fixedly connected to the end of the rotating shaft 606 that extends outside the second treatment pool 2. A chain 609 meshes between the gear 605 and the gear 608. Several rotating shafts 610 are fixedly connected between the rotating shaft 606 and the loop rod 607. An S-shaped fan blade 611 is rotatably connected to each rotating shaft 610.

[0035] Two fixing seats 701 and 702 are fixedly connected to the cover 4. A worm gear 703 is rotatably connected between the two fixing seats 701. A gear 704 is provided at one end of the worm gear 703 that rotatably passes through the fixing seat 701. A gear 705 is fixedly connected at one end of the rotating shaft 604 that rotatably passes through the fixing seat 603. A chain 706 meshes between gears 704 and 705. A rotating shaft 707 is rotatably connected between the two fixing seats 702. A turbine 708 and a cam 709 are fixedly connected to the rotating shaft 707. The turbine 708 meshes with the worm gear 703. A strip groove 710 is opened on the cover 4. The strip groove 710 extends into the thick wall of one side of the second treatment pool 2. The strip groove 710 is located directly above the sand filter assembly. A sliding plate 711 is slidably connected inside the strip groove 710. The cam 709 is located directly above the sliding plate 711. A spring 712 is fixedly connected between the 11 and the strip groove 710. The bottom of the strip groove 710 has through grooves 713 corresponding to the number of connecting pipes 3 and connected to the connecting pipes 3. A spiral scraper 714 for scraping sand off the surface of the filter screen 307 is slidably connected in each through groove 713. One end of the spiral scraper 714 is connected to the bottom of the slide plate 711. The bottom of each connecting pipe 3 has an opening. A long strip groove 715 is opened in the thick wall of the second treatment pool 2 below the opening. The inner diameter of the opening is smaller than the inner diameter of the long strip groove 715. A sealing cover 716 is slidably connected in the long strip groove 715. A sealing ring is provided on the side of the sealing cover 716 that contacts the opening. A protrusion 717 is fixedly connected in the long strip groove 715. Several springs 718 are fixedly connected between the bottom of the protrusion 717 and the sealing cover 716. One end of the long strip groove 715 is connected to a drain pipe 719, which is connected to the first treatment pool 1.

[0036] A gear 7 801 is fixedly connected to the end of shaft 4 606 away from gear 4 608. A shaft 6 802 is rotatably connected to the second processing pool 2, located to one side of gear 7 801. A gear 803 is fixedly connected to shaft 6 802. Gears 7 801 and 803 mesh. A shaft 7 804 is rotatably connected to the second processing pool 2, located to one side of gears 7 801 and 803. Gears 9 805 and 11 815 are fixedly connected to shaft 7 804. Pins 806 are provided on gears 7 801 and 803 for meshing with gear 9 805 to rotate gear 9 805. A screw 807 is rotatably connected inside the second processing pool 2. A gear 808 is fixedly connected to one end of the rod 807 extending outside the second treatment pool 2. A chain 809 meshes between the gear 808 and the gear 815. A slider 810 is threaded onto the screw 807. A fixed rod 811 is fixedly connected to the bottom of the slider 810. A rake-shaped scraper 812 is fixedly connected to one end of the fixed rod 811. The rake-shaped scraper 812 is slidably connected to the sand screening plate 104. Chutes 813 are fixedly connected to both sides of the sand screening plate 104. The height of each chute 813 is higher than the height of the sand screening plate 104. A circular groove 814 for sand accumulation is provided at the bottom of each chute 813. The loading and unloading sewage pipe 102 is located in the circular groove 814.

[0037] The implementation method of this embodiment is as follows: In use, the sewage containing oil, water and sand first enters the first treatment tank 1 through the oil inlet pipe 101 for sedimentation. As the liquid level rises, the oil and a small amount of unsedimented sand overflow from the highest point of the sand sieve plate 104. Under the action of gravity, the sand in the oil slides down the inclined sand sieve plate 104 and is retained by the barbs on the sand sieve plate 104, while the oil continues to flow down, realizing the secondary separation of sand and oil. Then, the liquid level between the first treatment tank 1 and the side wall near the second treatment tank 2 continues to rise. Subsequently, the oil enters the second treatment tank 2 through the connecting pipe 3. During this process, the sand is filtered by the filter screen 307 in the connecting pipe 3. Meanwhile, the high-temperature ethylene glycol in the high-temperature ethylene glycol main pipe 505 enters the high-temperature ethylene glycol coil 103, which keeps the oil warm, reduces the viscosity of the oil, makes the oil easier to float, and prevents the oil from solidifying in low-temperature environments. The ethylene glycol after heat exchange is discharged into the ethylene glycol circulation tank through the outlet of the high-temperature ethylene glycol coil 103, waiting for the next cycle.

[0038] When it is necessary to recover the floating oil in the second treatment tank 2, the screw pump 5 is started by the PLC controller. At this time, the relay starts the screw pump 5 after a 30-second delay. Simultaneously, the PLC controller closes the electric shut-off valve 509 and opens the electric shut-off valve 510 and the electric throttle valve 508. Ethylene glycol in the high-temperature ethylene glycol main pipe 505 enters the chamber 506, impacting the worm gear blades 512 inside the chamber 506, driving the rotating shaft 511 to rotate. At the same time, the PLC controller gradually reduces the opening of the electric throttle valve 508, gradually increasing the impact force at the ethylene glycol outlet. The rotating shaft 511 meshes with the worm gear 517 through the worm 514, driving the rotating shaft 516 to rotate. 16. Through overrunning clutch 2 518 (at this time, the inner ring drives the outer ring to rotate), gear 2 520 meshes and drives gear 1 519 to rotate. Gear 1 519 drives the outer ring of overrunning clutch 1 504 to rotate (at this time, the inner ring of overrunning clutch 1 504 does not rotate). The outer ring of overrunning clutch 1 504 is fixedly connected to the screw rotor 501. Therefore, the screw rotor 501 rotates synchronously with the outer ring of overrunning clutch 1 504 (at this time, the motor of screw pump 5 is not started, the inner ring of overrunning clutch 1 504 is stationary, and it does not affect the motor shaft 503 of screw pump 5). During the above rotation process, the residual oil between the screw rotor 501 and the rubber stator 502 of screw pump 5 is loosened, reducing the resistance between the two.

[0039] After 30 seconds of rotation, the relay triggers the motor of screw pump 5 to start. The motor shaft 503 drives the inner ring of overrunning clutch 504 to rotate, driving the screw rotor 501 to rotate. Through the cooperation of screw rotor 501 and rubber stator 502, screw pump 5 draws the oil floating in the second treatment tank 2 to the pre-dehydration separator for secondary treatment. At the same time, the PLC controller controls the opening of electric shut-off valve 509 and the closing of electric shut-off valve 510 and electric throttle valve 508. The outer ring of overrunning clutch 504 drives the outer ring of overrunning clutch 518 to rotate, but the inner ring does not rotate.

[0040] When it is necessary to agitate the oil in the second treatment tank 2, the motor 601 is started first. After the speed of the motor 601 is reduced by the gearbox 602, it drives the rotating shaft 604 to rotate. The rotating shaft 604 drives the rotating shaft 606 to rotate through the gear 605, the chain 609, and the gear 608. The boom rod 607 and the S-shaped fan blade 611 on the rotating shaft 604 rotate synchronously to agitate the oil in the second treatment tank 2. Agitation makes the oil evenly dispersed and quickly float to the surface, avoiding local accumulation. At the same time, it further prevents the oil from solidifying and improves the pumping efficiency of the screw pump.

[0041] When the motor 601 drives the rotating shaft 604 to rotate, the following structure is used to scrape sand off the surface of the filter screen 307: First, the gear 605 on the rotating shaft 604 drives the gear 5 704 to rotate through the chain 2 706, which in turn drives the worm gear 2 703 to rotate. The worm gear 2 703 meshes and drives the turbine 2 708 to rotate. The turbine 2 708 drives the cam 709 on the rotating shaft 5 707 to rotate. The cam 709 periodically presses down the sliding plate 711 (compression spring 1 712). The sliding plate 711 drives the circular scraper 714 to scrape off the sand attached to the surface of the filter screen 307. At the same time, when the circular scraper 714 moves down, it squeezes the sealing cover 716 (compression spring 2 718). The sealing cover 716 below the opening is opened, and the sand falls into the long groove 715 through the opening, and then flows back to the first treatment pool 1 through the drain pipe 719 to complete the sand cleaning. After the cam 709 rotates away, the spring 1 712 and the spring 2 718 reset, and the sealing cover 716 returns to its original position to seal.

[0042] When the rotating shaft 606 rotates, the sand accumulated on the sand screening plate 104 is cleaned through the following structure: First, the gear 7 801 on the rotating shaft 606 meshes and drives the gear 8 803 to rotate. The gear 8 803 drives the rotating shaft 6 802 to rotate. The pins 806 on the gears 7 801 and 8 803 mesh alternately and drive the gear 9 805 to rotate, so that the rotating shaft 7 804 rotates in both directions. The rotating shaft 7 804 drives the screw 807 to rotate in both directions through the gear 11 815, the chain 3 809 and the gear 10 808. The slider 2 810 on the screw 807 moves back and forth along the screw 807. The slider 2 810 drives the rake-shaped scraper 812 to slide back and forth on the sand screening plate 104 through the fixed rod 811, scraping the sand accumulated on the sand screening plate 104 into the chutes 813 on both sides, and finally falling into the circular trough 814 for concentrated accumulation, which is convenient for subsequent transportation and treatment through the loading and sewage pipe 102.

[0043] The above descriptions are merely embodiments of the present invention, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. An oil sands oil processing plant oily wastewater treatment system, characterized by, The utility model provides a filter sand assembly, first processing pool (1), second processing pool (2) and high temperature ethylene glycol main pipe (505) are included, and the communication pipe (3) of a plurality of communications is communicated between first processing pool (1) and second processing pool (2), and the detachable connection of filter sand assembly is all arranged in each communication pipe (3), and the cover (4) is equipped on first processing pool (1) and second processing pool (2), the oil liquid inlet pipe (101) is communicated in the side of first processing pool (1), and the sand screen plate (104) is equipped in first processing pool (1), the bottom of sand screen plate (104) is fixedly connected with the bottom of first processing pool (1), sand screen plate (104) is inclined, and the side of sand screen plate (104) near oil liquid inlet pipe (101) is higher than the other side, and the loading and discharging pipe (102) of a plurality of cars is equipped in first processing pool (1) and second processing pool (2), and the bottom of each loading and discharging pipe (102) extends to the bottom of first processing pool (1) and second processing pool (2), the bottom of first processing pool (1) and second processing pool (2) is paved with high temperature ethylene glycol coil pipe (103), the outlet end of high temperature ethylene glycol main pipe (505) is communicated with the import end of high temperature ethylene glycol coil pipe (103), the outlet end of high temperature ethylene glycol coil pipe (103) extends to first processing pool (1) outside, and the bottom of high temperature ethylene glycol coil pipe (103) is left with the gap between the bottom of first processing pool (1) and second processing pool (2), the top of cover (4) is equipped with support (401), and support (401) is located on second processing pool (2), and screw pump (5) is equipped on support (401), the screw rotor (501) and rubber stator (502) of screw pump (5) extend to second processing pool (2) in cover (4) penetration, the motor shaft (503) of screw pump (5) is equipped with overrun clutch one (504), the motor shaft (503) of screw pump (5) is fixedly connected with the inner ring of overrun clutch one (504), the screw rotor (501) of screw pump (5) is fixedly connected with the outer ring of overrun clutch one (504), the base (515) is equipped on cover (4), rotatable shaft no.The rotating shaft three (604) is provided with a gear three (605), the sidewall of the second treatment tank (2) is rotatably connected with a rotating shaft four (606), the rotating shaft four (606) is provided with a back-shaped rod (607), one end of the rotating shaft four (606) extending out of the second treatment tank (2) is provided with a gear four (608), and the gear three (605) and the gear four (608) are engaged with a chain one (609).

2. An oil sands ore processing plant oily wastewater treatment system according to claim 1 wherein, The driving assembly comprises a cavity (506) in communication with a high-temperature ethylene glycol main pipe (505) which is communicated with a high-temperature ethylene glycol branch pipe (507), the inlet and outlet of the high-temperature ethylene glycol branch pipe (507) are located at two sides of the cavity (506) respectively, the two ends of the high-temperature ethylene glycol branch pipe (507) are respectively provided with electric stop valve one (509) and electric stop valve two (510), the cavity (506) is transversely rotatably connected with a rotating shaft one (511), one end of the rotating shaft one (511) located in the cavity (506) is provided with a worm wheel blade (512), the cover (4) is provided with two fixed seats one (513), one end of the rotating shaft one (511) is fixedly connected with a worm one (514), the worm one (514) is rotatably connected with the fixed seat one (513), the rotating shaft two (516) is provided with a worm wheel one (517), the worm wheel one (517) is engaged with the worm one (514).

3. An oil sands ore processing plant oily wastewater treatment system according to claim 2 wherein, The high-temperature ethylene glycol main pipe (505) is provided with an electric throttle valve (508) at one end close to the inlet of the cavity (506), the screw pump (5) is electrically connected with a PLC controller and a relay, the electric throttle valve (508), the electric stop valve one (509) and the electric stop valve two (510) are electrically connected with the PLC controller and the relay.

4. An oil sands ore processing plant oily wastewater treatment system according to claim 1 wherein, The sand filtering assembly comprises a cylinder (301), the inner wall of the communication pipe (3) and the outer wall of the cylinder (301) are both provided with threads for mutual threaded connection, the cylinder (301) is internally provided with an annular sleeve (306), one side of the annular sleeve (306) is provided with two connecting rods (304), the other side is provided with a filter screen (307), one end of each of the two connecting rods (304) is provided with a sliding block one (305), the inner side of the cylinder (301) is provided with two sliding grooves (303), each of the sliding block one (305) is slidably connected with the sliding groove (303), the inner side of the annular sleeve (306) is provided with a cross rod (302), one side of the cross rod (302) abuts against the filter screen (307), the sliding groove (303) is internally provided with a screw (308) for limiting the connecting rod (304).

5. An oil sands ore processing plant oily wastewater treatment system according to claim 4 wherein, The cover (4) is respectively provided with a fixing seat three (701) and a fixing seat four (702), the fixing seat three (701) is rotatably connected with a worm two (703), one end of the worm two (703) penetrating through the fixing seat three (701) is provided with a gear five (704), one end of the rotating shaft three (604) penetrating through the fixing seat two (603) is provided with a gear six (705), the gear five (704) and the gear six (705) are engaged with a chain two (706), the fixing seat four (702) is rotatably connected with a rotating shaft five (707), the rotating shaft five (707) is provided with a turbine two (708) and a cam (709), the turbine two (708) is engaged with the worm two (703), the cover (4) is provided with a strip-shaped groove (710), the strip-shaped groove (710) extends to one side thick wall of the second treatment tank (2), the strip-shaped groove (710) is slidably connected with a sliding plate (711), the cam (709) is located directly above the sliding plate (711), the spring one (712) is arranged between the sliding plate (711) and the strip-shaped groove (710), the bottom of the strip-shaped groove (710) is provided with a through groove (713) corresponding to the communicating pipe (3), each through groove (713) is slidably connected with a back-shaped scraper (714) for scraping the sand on the surface of the filter screen (307), one end of the back-shaped scraper (714) is connected with the bottom of the sliding plate (711), the bottom of each communicating pipe (3) is provided with an opening, the opening is below the long slot (715) in the thick wall of the second treatment tank (2), the inner diameter of the opening is smaller than the inner diameter of the long slot (715), the long slot (715) is slidably connected with a sealing cover (716), the long slot (715) is provided with a protruding block (717), a plurality of spring two (718) are arranged between the protruding block (717) and the bottom of the sealing cover (716), the long slot (715) is communicated with a discharge pipe (719), the discharge pipe (719) is communicated with the first treatment tank (1).

6. An oil sands ore processing plant oily wastewater treatment system according to claim 1 wherein, The end of the rotating shaft four (606) away from the gear four (608) is provided with a gear seven (801), the second treatment pool (2) is located on one side of the gear seven (801) and is rotatably connected with a rotating shaft six (802), the rotating shaft six (802) is provided with a gear eight (803), the gear seven (801) and the gear eight (803) are engaged, the second treatment pool (2) is located on one side of the gear seven (801) and the gear eight (803) and is rotatably connected with a rotating shaft seven (804), the rotating shaft seven (804) is provided with a gear nine (805) and a gear eleven (815), the gear seven (801) and the gear eight (803) are provided with a pin (806) for engaging the gear nine (805) to make the gear nine (805) reverse, the second treatment pool (2) is rotatably connected with a screw rod (807), one end of the screw rod (807) extending out of the second treatment pool (2) is provided with a gear ten (808), the gear ten (808) and the gear eleven (815) are engaged with a chain three (809), the screw rod (807) is threadedly connected with a sliding block two (810), the bottom of the sliding block two (810) is provided with a fixed rod (811), one end of the fixed rod (811) is provided with a rake-shaped scraper (812), the rake-shaped scraper (812) is slidably connected with a sand screening plate (104), both sides of the sand screening plate (104) are provided with a chute (813), the height of each chute (813) is higher than the height of the sand screening plate (104), the bottom of each chute (813) is provided with a circular groove (814) for accumulating sand, and the loading and sewage pipe (102) is located in the circular groove (814).

7. An oil sands ore processing plant oily wastewater treatment system according to claim 1 wherein, The bottom of the first treatment pool (1) and the second treatment pool (2) is inclined.

8. An oil sands ore processing plant oily wastewater treatment system according to claim 1 wherein, A plurality of rotating shaft eights (610) are fixedly connected between the rotating shaft four (606) and the back-shaped rod (607), and each rotating shaft eight (610) is rotatably connected with an S-shaped fan blade (611).

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