Multistage reverse osmosis recycling device

Abstract

The utility model discloses a multi-stage reverse osmosis recycling device, which is applied to the technical field of reverse osmosis, and remarkably improves the sewage treatment efficiency of oil and gas fields through the collaborative design of stage filtration and oil-water separation, a first filter layer intercepts large-particle dirt to protect subsequent equipment, a second filter layer further purifies water, and the water quality is improved. After precipitation separation, an oil pump accurately pumps out floating oil, pollution of the RO membrane set is avoided, the membrane blockage risk can be reduced and the membrane service life can be prolonged when pretreated clear water enters the RO membrane set, efficient separation of oil, solid and liquid is realized through a pure mechanical structure in the whole process, the use of chemical agents is reduced, and the device is particularly suitable for continuous treatment of high-oil-content sewage; when maintenance is needed, an operator can easily separate the clear water pipe from the RO membrane set, the pipelines on the two sides are automatically closed in real time to prevent liquid leakage, when butt joint is conducted again after maintenance is completed, the pipelines automatically recover the water passing function, and the downtime of equipment is remarkably shortened through the design.

Description

Technical Field

[0001] This utility model belongs to the field of reverse osmosis technology, and specifically relates to a multi-stage reverse osmosis reuse device. Background Technology

[0002] A gas field refers to the sum of oil reservoirs, gas reservoirs, and oil-gas reservoirs within the same area controlled by a single local structural unit. If there are only oil reservoirs within this local structural area, it is called an oil field; if there are only gas reservoirs, it is called a gas field. Multi-stage reverse osmosis (RO) reuse devices are used for wastewater treatment within oil and gas fields. However, in traditional RO reuse devices, large particulate impurities and grease directly enter the system, which accelerates RO membrane clogging and damage, leading to frequent shutdowns for cleaning. Incomplete oil-water separation reduces product water quality and increases energy consumption. Reliance on chemical agents for oil removal may cause secondary pollution, significantly increasing operation and maintenance costs. Furthermore, when maintaining the RO membrane module in traditional RO reuse devices, disassembling the pipeline requires first emptying the system and closing multiple valves, which is cumbersome and time-consuming. Continuous leakage after disconnection can easily cause on-site pollution. Reinstallation requires manual inspection of the seal, posing a risk of misoperation. To address the problems mentioned above, we propose a multi-stage reverse osmosis reuse device. Utility Model Content

[0003] The purpose of this utility model is to provide a multi-stage reverse osmosis reuse device, which has the advantages of multi-stage filtration and convenient maintenance.

[0004] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a multi-stage reverse osmosis reuse device, including a sewage tank, a first filter layer bolted to the left side of the bottom of the sewage tank, a second filter layer bolted to the right side of the bottom of the sewage tank, a high-pressure pump embedded in the right side of the sewage tank, an inlet pipe connected to the left side of the high-pressure pump, and the surface of the inlet pipe penetrating the right side of the sewage tank and fitting therein, a first outlet pipe connected to the right side of the sewage tank, a quick-release mechanism provided on the left side of the surface of the first outlet pipe, a top plate bolted to the right side of the top of the sewage tank, a baffle bolted to the left side of the bottom of the top plate, and an oil extraction mechanism provided on the left side of the top plate.

[0005] The above technical solution is as follows: Wastewater discharged from the oil and gas field enters the wastewater tank through the inlet. When the wastewater encounters the first filter layer, large particles of dirt in the wastewater are filtered out. The filtered wastewater then comes into contact with the second filter layer, which filters out small particles of dirt. The wastewater that has been filtered again enters the right side of the wastewater tank. During the filtration process, oil and water will separate into layers. Water, being denser, settles at the bottom of the wastewater tank, while oil floats at the top. A baffle blocks the oil layer at the top left side of the wastewater tank. An oil pump operates to extract the floating oil layer, and the oil enters through the oil inlet pipe. The oil enters the oil pump and is then discharged from the pump through the outlet pipe. The synergistic design of staged filtration and oil-water separation significantly improves the efficiency of oil and gas field wastewater treatment. The first filtration layer intercepts large particles of dirt to protect downstream equipment, while the second filtration layer further purifies the water. After sedimentation and separation, the oil pump precisely removes floating oil, avoiding RO membrane fouling. When the pretreated clean water enters the RO membrane, the risk of membrane clogging is reduced, extending the membrane life. The entire process achieves efficient separation of oil, solids, and liquids through a purely mechanical structure, reducing the use of chemical agents. It is especially suitable for the continuous treatment of high-oil-content wastewater.

[0006] The present invention is further configured such that the quick-release mechanism includes a first connecting pipe, which is fixedly sleeved on the left side of the surface of the first water outlet pipe. A sleeve is rotatably sleeved on the surface of the first connecting pipe. An internal thread is provided on the right side of the inner wall of the sleeve. An external thread is connected to the internal thread of the internal thread. A second connecting pipe is provided inside the external thread. A second water outlet pipe is fixedly sleeved on the right side of the inner wall of the second connecting pipe. A spring is fixedly sleeved at one end of the surface of the first water outlet pipe and the second water outlet pipe that is close to each other. A retaining ball is fixedly sleeved at one end of the two springs that is close to each other. A through pipe is clamped at the end of the retaining ball that is away from the spring.

[0007] The above technical solution employs a quick-release mechanism. When maintenance of the RO membrane module is required, rotating the sleeve causes the internal thread to rotate, disengaging the internal thread from the external thread. This separates the first and second connecting pipes, causing the spring to spring back outwards, moving the retaining ball to seal the connection between the first and second water outlet pipes. The retaining ball on the right side pushes the through pipe to the left. After maintenance, aligning the first connecting pipe with the second connecting pipe, rotating the sleeve causes the internal thread to rotate in the opposite direction, connecting the internal and external threads. The through pipe then presses the retaining balls on both sides, which in turn press the spring, causing the spring to contract and connecting the first and second water outlet pipes. Operators can easily separate the clean water pipe from the RO membrane module. The pipes on both sides are automatically sealed immediately to prevent liquid leakage. When reconnecting after maintenance, the pipes automatically resume water flow. This design significantly shortens equipment downtime, ensuring system sealing and improving maintenance efficiency. It is particularly suitable for high-pollution water treatment scenarios in oil and gas fields that require frequent maintenance.

[0008] The present invention is further configured such that the oil pumping mechanism includes an oil pump, the oil pump is embedded in the left side of the top plate, the left side of the oil pump is connected to an oil inlet pipe, the right side of the oil pump is connected to an oil outlet pipe, and the surface of the oil outlet pipe penetrates the right side of the top plate.

[0009] The above technical solution involves setting up an oil extraction mechanism. During the filtration process, the oil and water will separate into layers. Water has a higher density and settles at the bottom of the sewage tank, while the oil floats on top. The oil pump works to extract the floating oil layer. The oil enters the oil pump from the oil inlet pipe and is then discharged from the oil pump to the oil outlet pipe.

[0010] The present invention is further configured such that the first filter layer is composed of a stainless steel sintered filter screen and a ceramic filter element, and the second filter layer is composed of a PP melt-blown filter element and an ultra-fine glass fiber composite membrane.

[0011] The above technical solution employs a combination of stainless steel sintered filter screen and ceramic filter element, forming a stable pore structure through a multi-layer sintering process. This structure can intercept large particulate impurities such as oil sludge and sand particles, and is resistant to high-pressure erosion and corrosion. The ceramic filter element is manufactured using a high-temperature sintering process, resulting in low surface roughness, which reduces oil adhesion and extends the cleaning cycle. Furthermore, the solution is composed of a PP melt-blown filter element and an ultra-fine glass fiber composite membrane. Through a gradient melt-blowing process, it can effectively trap suspended solids and colloids. The ultra-fine glass fiber composite membrane has a high particle retention rate and outstanding resistance to oil contamination.

[0012] The present invention is further configured such that sliders are welded to the top and bottom of the surface of the through pipe, and grooves are provided at the top and bottom of the left side of the inner wall of the second connecting pipe, and the inside of the grooves and the surface of the sliders are slidably connected.

[0013] The above technical solution uses a slider and a groove to limit the movement of the tube.

[0014] The present invention is further configured such that an RO membrane module is connected to the right side of the second water outlet pipe.

[0015] The above technical solution involves setting up an RO membrane module. Under certain pressure, water molecules can pass through the RO membrane, while impurities such as inorganic salts, heavy metal ions, organic matter, colloids, bacteria, and viruses in the source water cannot pass through the RO membrane, thus strictly separating the permeable pure water from the non-permeable concentrated water.

[0016] The present invention is further configured such that an inlet is connected through and sleeved on the left side of the sewage tank.

[0017] The above technical solution allows wastewater discharged from oil and gas fields to enter a wastewater pond through an inlet.

[0018] The present invention is further configured such that openings are provided on both sides of the through pipe.

[0019] By adopting the above technical solution, the flow rate of the pipe can be increased by setting an opening.

[0020] In summary, this utility model has the following beneficial effects:

[0021] 1. This utility model significantly improves the efficiency of oil and gas field wastewater treatment through the synergistic design of staged filtration and oil-water separation. The first filtration layer intercepts large particles of dirt to protect downstream equipment, the second filtration layer further purifies the water quality, and after sedimentation and separation, the oil pump accurately removes floating oil to avoid RO membrane fouling. When the pretreated clean water enters the RO membrane, the risk of membrane blockage can be reduced and the membrane life can be extended. The entire process achieves efficient separation of oil, solid and liquid through a purely mechanical structure, reducing the use of chemical agents, and is especially suitable for the continuous treatment of high oil content wastewater.

[0022] 2. This utility model allows operators to easily disconnect the clean water pipe from the RO membrane module when maintenance is required. The pipes on both sides are automatically sealed immediately to prevent liquid leakage. When the pipes are reconnected after maintenance, the water flow function is automatically restored. This design significantly shortens equipment downtime, ensures system sealing, and improves maintenance efficiency. It is particularly suitable for high-pollution water treatment scenarios in oil and gas fields that require frequent maintenance. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0024] Figure 2 This is a front sectional view of the overall structure of this utility model;

[0025] Figure 3 This is a utility model Figure 2 An enlarged schematic diagram of the structure at point A in the middle.

[0026] Reference numerals: 1. Wastewater tank; 2. First filter layer; 3. Second filter layer; 4. High-pressure pump; 5. Inlet; 6. Inlet pipe; 7. First outlet pipe; 8. Second outlet pipe; 9. Top plate; 10. Baffle; 11. First connecting pipe; 12. Second connecting pipe; 13. Sleeve; 14. Internal thread; 15. External thread; 16. Spring; 17. Ball clamp; 18. Through pipe; 19. Oil pump; 20. Oil inlet pipe; 21. Oil outlet pipe; 22. Slider; 23. Slide groove; 24. RO membrane module; 25. Opening. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings.

[0028] Example 1:

[0029] refer to Figure 1 , Figure 2A multi-stage reverse osmosis reuse device includes a wastewater tank 1. A first filter layer 2 is bolted to the left side of the bottom of the wastewater tank 1, and a second filter layer 3 is bolted to the right side of the bottom of the wastewater tank 1. A high-pressure pump 4 is embedded in the right side of the wastewater tank 1. An inlet pipe 6 is connected to the left side of the high-pressure pump 4, and the surface of the inlet pipe 6 penetrates the right side of the wastewater tank 1 and is sleeved thereon. A first outlet pipe 7 is connected to the right side of the wastewater tank 1, and a quick-release mechanism is provided on the left side of the surface of the first outlet pipe 7. A top plate 9 is bolted to the right side of the top of the wastewater tank 1, and a baffle 10 is bolted to the left side of the bottom of the top plate 9. An oil extraction mechanism is provided on the left side of the top plate 9. Wastewater discharged from the oil and gas field enters the wastewater tank 1 through the inlet 5. When the wastewater encounters the first filter layer 2, large particles of dirt in the wastewater are filtered out. The wastewater then comes into contact with the second filter layer 3, which filters out small particles of dirt. The filtered wastewater then enters the right side of the wastewater tank 1. During the filtration process, the oil separates from the water. Water has a higher density and settles at the bottom of the wastewater tank 1, while the oil floats at the top. The baffle 10 blocks the oil layer at the top left side of the wastewater tank. The oil pump 19 works to extract the floating oil layer. The oil enters the oil pump 19 from the oil inlet pipe 20 and is then discharged from the oil pump 19 to the oil outlet pipe 21. The synergistic design of staged filtration and oil-water separation significantly improves the efficiency of wastewater treatment in oil and gas fields. The first filter layer 2 intercepts large particles of dirt to protect downstream equipment, while the second filter layer 3 further purifies the water. After sedimentation and separation, the oil pump 19 precisely extracts the floating oil, preventing RO membrane contamination.

[0030] refer to Figure 1 , Figure 2 The oil pumping mechanism includes an oil pump 19, which is embedded on the left side of the top plate 9. The left side of the oil pump 19 is connected to an oil inlet pipe 20, and the right side of the oil pump 19 is connected to an oil outlet pipe 21. The surface of the oil outlet pipe 21 penetrates the right side of the top plate 9. By setting up the oil pumping mechanism, during the filtration process, the oil and water will separate into layers. Water has a higher density and settles at the bottom of the sewage tank 1, while the oil floats at the top. The oil pump 19 works to extract the floating oil layer. The oil enters the oil pump 19 from the oil inlet pipe 20 and is discharged from the oil pump 19 to the oil outlet pipe 21.

[0031] refer to Figure 1 , Figure 2 The first filter layer 2 is composed of a stainless steel sintered filter screen and a ceramic filter element, and the second filter layer 3 is composed of a PP melt-blown filter element and an ultra-fine glass fiber composite membrane. By using a stainless steel sintered filter screen and a ceramic filter element, a stable pore structure is formed through a multi-layer sintering process, which can intercept large particulate impurities such as oil sludge and sand particles, and is resistant to high-pressure erosion and corrosion. The ceramic filter element is made by a high-temperature sintering process, with low surface roughness, which can reduce oil stain adhesion and extend the cleaning cycle. By using a PP melt-blown filter element and an ultra-fine glass fiber composite membrane, a gradient melt-blowing process can effectively intercept suspended solids and colloids. The ultra-fine glass fiber composite membrane has a high particle rejection rate and outstanding resistance to oil pollution.

[0032] refer to Figure 1 , Figure 2 , Figure 3 The right side of the second water outlet pipe 8 is connected to an RO membrane module 24. By setting up the RO membrane module 24, under a certain pressure, water molecules can pass through the RO membrane, while impurities such as inorganic salts, heavy metal ions, organic matter, colloids, bacteria, and viruses in the source water cannot pass through the RO membrane, thus strictly separating the pure water that can pass through from the concentrated water that cannot.

[0033] refer to Figure 1 , Figure 2 The left side of the sewage tank 1 is connected to an inlet 5, through which sewage discharged from the oil and gas field can enter the sewage tank 1.

[0034] Brief description of the usage process: When multi-stage reverse osmosis reuse is required for wastewater discharged from oil and gas fields, the wastewater enters wastewater tank 1 through inlet 5. When the wastewater encounters the first filter layer 2, large particles of dirt in the wastewater are filtered out. The filtered wastewater then comes into contact with the second filter layer 3, which filters out small particles of dirt. The wastewater that has been filtered again enters the right side of wastewater tank 1. During the filtration process, oil and water will separate into layers. Water has a higher density and settles at the bottom of wastewater tank 1, while oil floats at the top. Baffle 10 blocks the oil layer at the top left side of the wastewater tank. Oil pump 19 works to pump out the floating oil layer. Oil enters the oil pump 19 from the oil inlet pipe 20 and is then discharged from the oil pump 19 to the oil outlet pipe 21. The synergistic design of staged filtration and oil-water separation significantly improves the efficiency of oil and gas field wastewater treatment. The first filter layer 2 intercepts large particles of dirt to protect downstream equipment, and the second filter layer 3 further purifies the water. After sedimentation and separation, the oil pump 19 accurately extracts the floating oil, avoiding pollution of the RO membrane module 24. When the pretreated clean water enters the RO membrane module 24, the risk of membrane clogging can be reduced and the membrane life can be extended. The entire process achieves efficient separation of oil, solids and liquids through a purely mechanical structure, reducing the use of chemical agents, and is especially suitable for the continuous treatment of high-oil-content wastewater.

[0035] Example 2:

[0036] refer to Figure 1 , Figure 2 , Figure 3A multi-stage reverse osmosis (RO) reuse device includes a quick-release mechanism comprising a first connecting pipe 11, which is fixedly sleeved on the left side of the surface of a first outlet pipe 7. A sleeve 13 is rotatably sleeved on the surface of the first connecting pipe 11. An internal thread 14 is provided on the right side of the inner wall of the sleeve 13. An external thread 15 is connected to the internal thread of the internal thread 14. A second connecting pipe 12 is provided inside the external thread 15. A second outlet pipe 8 is fixedly sleeved on the right side of the inner wall of the second connecting pipe 12. A spring 16 is fixedly sleeved at one end of the surface of the first outlet pipe 7 and the second outlet pipe 8. A retaining ball 17 is fixedly sleeved at one end of the two springs 16 that is close to each other. A connecting pipe 18 is engaged at the end of the retaining ball 17 away from the spring 16. When maintenance of the RO membrane module 24 is required, the sleeve 13 is rotated, causing the internal thread 14 to rotate. When the internal thread 14 rotates, it loses its threaded connection with the external thread 15, separating the first connecting pipe 11 and the second connecting pipe 12. The spring 16 loses its squeezing force and rebounds outward, causing the retaining ball 17 to move and seal the connection between the first water outlet pipe 7 and the second water outlet pipe 8. The retaining ball 17 on the right side squeezes the through pipe 18 to the left. After maintenance, the first connecting pipe 11 is aligned with the second connecting pipe 12. The sleeve 13 is rotated to drive the internal thread 14 to rotate in the opposite direction, and the internal thread 14 is threadedly connected with the external thread 15. The through pipe 18 squeezes the retaining balls 17 on both sides, and the retaining balls 17 squeeze the spring 16. The spring 16 contracts, and the first water outlet pipe 7 and the second water outlet pipe 8 are connected. The operator can easily separate the clean water pipe from the RO membrane module 24. The pipes on both sides are immediately and automatically sealed to prevent liquid leakage.

[0037] refer to Figure 2 , Figure 3 The top and bottom of the surface of the tube 18 are welded with sliders 22, and the top and bottom of the left side of the inner wall of the second connecting tube 12 are provided with grooves 23, and the inside of the grooves 23 and the surface of the sliders 22 are slidably connected. By setting the sliders 22 and the grooves 23, the movement of the tube 18 can be limited.

[0038] refer to Figure 2 , Figure 3 The pipe 18 has openings 25 on both sides, which can increase the flow rate of the pipe 18.

[0039] Brief description of usage: When maintenance of the RO membrane module 24 is required, rotate the sleeve 13, causing the internal thread 14 to rotate. The internal thread 14 rotates and loses its threaded connection with the external thread 15, separating the first connecting pipe 11 and the second connecting pipe 12. The spring 16 loses its squeezing force and rebounds outward, causing the retaining ball 17 to move, sealing the connection between the first outlet pipe 7 and the second outlet pipe 8. The retaining ball 17 on the right side pushes the through pipe 18 to the left. The slider 22 and the groove 23 limit the movement of the through pipe 18. After maintenance, align the first connecting pipe 11 with the second connecting pipe 12, and rotate the sleeve 13. 3 drives the internal thread 14 to rotate in the opposite direction, and the internal thread 14 is threadedly connected to the external thread 15. The through pipe 18 squeezes the ball clamps 17 on both sides, and the ball clamps 17 squeeze the spring 16. The spring 16 retracts, and the first water outlet pipe 7 and the second water outlet pipe 8 are connected. The operator can easily separate the clean water pipe from the RO membrane module 24. The pipes on both sides are automatically sealed immediately to prevent liquid leakage. When the pipes are reconnected after maintenance, the pipes automatically restore the water flow function. This design significantly shortens the equipment downtime, ensures the system's sealing performance and improves maintenance efficiency. It is especially suitable for high-pollution water treatment scenarios in oil and gas fields that require frequent maintenance.

[0040] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. A multi-stage reverse osmosis reuse device, comprising a wastewater tank (1), characterized in that: The bottom left side of the sewage tank (1) is bolted with a first filter layer (2), the bottom right side of the sewage tank (1) is bolted with a second filter layer (3), the right side of the sewage tank (1) is embedded with a high-pressure pump (4), the left side of the high-pressure pump (4) is connected to an inlet pipe (6), and the surface of the inlet pipe (6) penetrates the right side of the sewage tank (1) and is sleeved thereon. The right side of the sewage tank (1) is connected to a first outlet pipe (7), the left side of the surface of the first outlet pipe (7) is provided with a quick-release mechanism, the right side of the top of the sewage tank (1) is bolted with a top plate (9), the left side of the bottom of the top plate (9) is bolted with a baffle (10), and the left side of the top plate (9) is provided with an oil extraction mechanism.

2. The multi-stage reverse osmosis reuse device according to claim 1, characterized in that: The quick-release mechanism includes a first connecting pipe (11), which is fixedly sleeved on the left side of the surface of the first water outlet pipe (7). A sleeve (13) is rotatably sleeved on the surface of the first connecting pipe (11). An internal thread (14) is provided on the right side of the inner wall of the sleeve (13). An external thread (15) is connected to the internal thread of the internal thread (14). A second connecting pipe (12) is provided inside the external thread (15). A second water outlet pipe (8) is fixedly sleeved on the right side of the inner wall of the second connecting pipe (12). A spring (16) is fixedly sleeved at one end of the surface of the first water outlet pipe (7) and the second water outlet pipe (8). A retaining ball (17) is fixedly sleeved at one end of the two springs (16) that are close to each other. A through pipe (18) is clamped at one end of the retaining ball (17) that is away from the spring (16).

3. The multi-stage reverse osmosis reuse device according to claim 1, characterized in that: The oil pumping mechanism includes an oil pump (19), which is embedded in the left side of the top plate (9). The left side of the oil pump (19) is connected to an oil inlet pipe (20), and the right side of the oil pump (19) is connected to an oil outlet pipe (21). The surface of the oil outlet pipe (21) penetrates the right side of the top plate (9).

4. A multi-stage reverse osmosis reuse device according to claim 1, characterized in that: The first filter layer (2) is composed of a stainless steel sintered filter screen and a ceramic filter element, and the second filter layer (3) is composed of a PP melt-blown filter element and an ultra-fine glass fiber composite membrane.

5. A multi-stage reverse osmosis reuse device according to claim 2, characterized in that: The top and bottom of the surface of the through pipe (18) are welded with sliders (22), and the top and bottom of the left side of the inner wall of the second connecting pipe (12) are provided with grooves (23), and the inside of the grooves (23) and the surface of the sliders (22) are slidably connected.

6. A multi-stage reverse osmosis reuse device according to claim 2, characterized in that: The right side of the second outlet pipe (8) is connected to an RO membrane module (24).

7. A multi-stage reverse osmosis reuse device according to claim 1, characterized in that: The sewage tank (1) has an inlet (5) that runs through and is fitted onto its left side.

8. A multi-stage reverse osmosis reuse device according to claim 2, characterized in that: The through pipe (18) has openings (25) on both sides.

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