Sewage treatment device for oil and gas field engineering environmental protection

Abstract

The utility model relates to an environment-friendly sewage treatment device for oil and gas field engineering, which comprises a sewage treatment tank and is technically characterized in that a sewage receiving inner cylinder concentric with the sewage treatment tank is arranged in the sewage treatment tank, the lower end of the sewage receiving inner cylinder is fixedly connected with the bottom surface of the sewage treatment tank, a gland is arranged at the upper end of the sewage receiving inner cylinder, and a vertical pipe with a sealed top is arranged in the center of the upper surface of the gland; a water through hole group is formed in the middle upper part of the sewage receiving inner cylinder, a conical filter screen cylinder concentric with the sewage receiving inner cylinder is arranged in the sewage receiving inner cylinder, the upper end of the conical filter screen cylinder is connected with the lower end of the vertical pipe, and the lower end of the conical filter screen cylinder is fixedly connected with the bottom surface of the sewage treatment tank; and the sewage treatment tank is provided with a stirring mechanism above the aeration structure. According to the device, the three-phase separation speed of oil, water and solid impurities is remarkably increased, and the separation effect is good.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and gas field environmental protection treatment, in particular to a sewage treatment device used for oil and gas field engineering environmental protection. Background Art

[0002] During oil and gas field development, a large amount of wastewater is discharged to the surface. This oilfield wastewater contains clay particles carried from the formation, as well as pollutants such as additives in crude oil and treatment fluids. This makes it very difficult to treat it to meet standards. Therefore, dedicated wastewater treatment equipment is required for environmentally friendly treatment and reuse.

[0003] For example, CN 215975236 U discloses a wastewater treatment device for oil and gas field engineering environmental protection. The device comprises a housing, with a water inlet and an air inlet fixedly connected to the outer wall of one side of the housing, a drain port fixedly connected to the outer wall of the other side of the housing, a mud outlet fixedly connected to the bottom of the housing, an exhaust port fixedly connected to one side of the top of the housing, and a glass column fixedly connected to the other side of the top of the housing. The outer wall of the glass column is connected to an oil outlet. A motor is installed at the center of the top of the housing, and a transmission rod at the bottom of the motor passes through the housing wall and is connected to a rotating wheel. A leakage screen is embedded in the housing. Air is blown in through the air inlet inside the housing and adheres to the floating oil in the sewage and floats up, thereby quickly separating the floating oil from the water. The motor drives the rotating wheel to disperse the bubbles, thereby more thoroughly separating the floating oil from the sewage. At the same time, suspended matter in the sewage is deposited at the bottom of the housing under the action of gravity to form sludge, thereby achieving three-layer separation of the sewage. However, the following problems still exist during use: under the dual action of the gas and the rotating wheel, the suspended matter cannot be quickly deposited, resulting in poor separation effect. Utility Model Content

[0004] The purpose of the utility model is to provide a sewage treatment device for oil and gas field engineering environment protection with reasonable structure and reliable use to solve the above problems, which significantly improves the three-phase separation speed of oil, water and solid debris and has good separation effect.

[0005] The technical solution of the utility model is:

[0006] A sewage treatment device for environmental protection of oil and gas field projects comprises a sewage treatment tank, a water inlet pipe and an oil discharge pipe higher than the water inlet pipe are provided at the upper part of the side wall of the sewage treatment tank, a drainage pipe is provided at the lower part of the side wall of the sewage treatment tank, a filter membrane is provided at the inner end of the drainage pipe, a mud discharge port is provided at the center of the bottom surface of the sewage treatment tank, and an exhaust port is provided at the top of the sewage treatment tank. The technical key points are: a sewage receiving inner cylinder concentric with the sewage treatment tank is provided, the lower end of the sewage receiving inner cylinder is connected and fixed to the bottom surface of the sewage treatment tank, a pressure cover is provided at the upper end, and a riser with an upper cap is provided at the center of the upper surface of the pressure cover, the inner end of the water inlet pipe is connected to the side wall of the upper end of the riser, a water hole group is provided in the middle and upper part of the sewage receiving inner cylinder, a conical filter mesh cylinder concentric with the sewage receiving inner cylinder is provided inside the sewage receiving inner cylinder, the upper end of the conical filter mesh cylinder is connected to the lower end of the riser, and the lower end is connected and fixed to the bottom surface of the sewage treatment tank, an aeration structure is built-in at the lower part of the sewage treatment tank, and the sewage treatment tank is provided with a stirring mechanism above the aeration structure.

[0007] The above-mentioned sewage treatment device for environmental protection of oil and gas field projects, the aeration structure includes an annular ventilation pipe fixed on the inner wall of the sewage treatment tank, a plurality of nozzles provided on the upper surface of the annular ventilation pipe, and an air intake pipe connected to the annular ventilation pipe. The outer end of the air intake pipe passes through the sewage treatment tank and is provided with a one-way valve.

[0008] The above-mentioned sewage treatment device for environmental protection of oil and gas field projects, the stirring mechanism includes a linkage sleeve fixed on the riser by a bearing, a driven gear arranged at the upper end of the linkage sleeve, a rotating frame arranged at the lower end of the linkage sleeve, stirring paddles symmetrically arranged on both sides of the rotating frame, and a driving gear meshing with the driven gear. A motor reducer is fixed on the top of the sewage treatment tank, the output shaft of the motor reducer is connected and fixed to the axle of the driving gear, and the stirring paddle is located between the sewage treatment tank and the sewage receiving inner cylinder.

[0009] The above-mentioned sewage treatment device for environmental protection of oil and gas field projects has a conical bottom surface of the sewage treatment tank, and a secondary sewage outlet is provided at the lower end of the bottom surface corresponding to the position between the sewage treatment tank and the sewage receiving inner cylinder.

[0010] The beneficial effects of the utility model are:

[0011] The sewage enters the sewage receiving inner cylinder through the water inlet pipe and the riser, and then enters the annular cavity between the sewage treatment tank and the sewage receiving cylinder through the conical filter mesh cylinder and the water hole group on the sewage receiving inner cylinder. The solid debris therein is intercepted by the conical filter mesh cylinder and the sewage receiving inner cylinder and accelerated to be deposited on the bottom surface of the sewage treatment tank. The oil phase in the oil-water mixture floats to the liquid surface under the dual action of the aeration structure and the stirring mechanism and is discharged from the oil discharge port, while the water phase is filtered again through the filter membrane and discharged through the drain port, realizing the three-phase separation of oil, water and solid debris. Compared with the existing technology, the utility model significantly improves the three-phase separation speed of oil, water and solid debris, and has a good separation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural diagram of the utility model;

[0013] In the figure: 1. Rain cover, 2. Exhaust port, 3. Sewage treatment tank, 4. Standpipe, 5. Water inlet pipe, 6. Driven gear, 7. Rotating frame, 8. Agitator, 9. Nozzle, 10. Annular ventilation pipe, 11. One-way valve, 12. Inlet pipe, 13. Auxiliary sewage outlet, 14. Mud outlet, 15. Conical filter cylinder, 16. Sewage receiving inner cylinder, 17. Water hole group, 18. Filter membrane, 19. Drain pipe, 20. Gland, 21. Driving gear, 22. Oil drain pipe, 23. Motor reducer. DETAILED DESCRIPTION

[0014] The utility model is described in detail according to the accompanying drawings.

[0015] like Figure 1 As shown, the sewage treatment device for environmental protection of oil and gas field projects includes a sewage treatment tank 3, an upper part of the side wall of the sewage treatment tank 3 is provided with a water inlet pipe 5 and an oil discharge pipe 22 higher than the water inlet pipe 5, a lower part of the side wall of the sewage treatment tank 3 is provided with a drain pipe 19, the inner end of the drain pipe 19 is provided with a filter membrane 18, a mud discharge port 14 is provided at the center of the bottom surface of the sewage treatment tank 3, an exhaust port 2 is provided at the top of the sewage treatment tank 3, and a rain cover 1 is provided on the top of the exhaust port 2.

[0016] Among them, the sewage treatment tank 3 is provided with a sewage receiving inner cylinder 16 concentric therewith, the lower end of the sewage receiving inner cylinder 16 is connected and fixed to the bottom surface of the sewage treatment tank 3, the upper end is provided with a pressure cover 20 and the center of the upper surface of the pressure cover 20 is provided with a standpipe 4 with an upper cap, the inner end of the water inlet pipe 5 is connected to the side wall of the upper end of the standpipe 4, the upper middle part of the sewage receiving inner cylinder 16 is provided with a water hole group 17, and the inside of the sewage receiving inner cylinder 16 is provided with a conical filter screen cylinder 15 concentric therewith, the upper end of the conical filter screen cylinder 15 is connected to the lower end of the standpipe 4, and the lower end is connected and fixed to the bottom surface of the sewage treatment tank 3.

[0017] The sewage treatment tank 3 has an aeration structure built into its lower portion. In this embodiment, the aeration structure comprises an annular ventilation pipe 10 fixed to the inner wall of the sewage treatment tank 3, a plurality of nozzles 9 provided on the upper surface of the annular ventilation pipe 10, and an air intake pipe 12 connected to the annular ventilation pipe 10. The outer end of the air intake pipe 12 passes through the sewage treatment tank 3 and is provided with a one-way valve 11. The sewage treatment tank 3 is provided with a stirring mechanism above the aeration structure. In this embodiment, the stirring mechanism comprises a linkage sleeve fixed to the riser 4 by a bearing, a driven gear 6 provided at the upper end of the linkage sleeve, a rotating frame 7 provided at the lower end of the linkage sleeve, L-shaped stirring paddles 8 symmetrically provided on both sides of the rotating frame 7, and a driving gear 21 meshing with the driven gear 6. A motor reducer 23 is fixed to the top of the sewage treatment tank 3. The output shaft of the motor reducer 23 is connected and fixed to the axle of the driving gear 21. The stirring paddle 8 is located between the sewage treatment tank 3 and the sewage receiving inner cylinder 16.

[0018] The bottom surface of the sewage treatment tank 3 is a conical surface, and a secondary sewage outlet 13 is provided at the lower end of the bottom surface corresponding to the position between the sewage treatment tank 3 and the sewage receiving inner cylinder 16.

[0019] Working principle:

[0020] 1. Sewage is introduced through the water inlet pipe 5, and the sewage enters the conical filter cylinder 15 through the vertical pipe 4, and then enters the sewage receiving inner cylinder 16 through the conical filter cylinder 15, and then enters the sewage treatment tank 3 through the water hole group 17.

[0021] 2. Start the aerator in advance. The gas enters the annular ventilation pipe 10 through the air inlet pipe 12 and the one-way valve 11, and is then sprayed into the sewage treatment tank 3 through the various nozzles 9, forming bubbles in the sewage and causing them to rise. At the same time, the motor reducer 23 drives the rotating frame 7 and the stirring paddle 8 to rotate synchronously through the driving gear 21 and the driven gear 6. Under the dual effects of the aeration structure and the stirring mechanism, the oil phase in the oil-water mixture floats to the liquid surface and is discharged from the oil discharge port 22, while the water phase is filtered again by the filter membrane 18 and discharged through the drain port 19.

[0022] 3. The solid debris in the sewage is intercepted by the conical filter cylinder 15 and the sewage receiving inner cylinder 16 and is accelerated to deposit on the bottom surface of the sewage treatment tank 3. After a set time, it is discharged through the mud discharge port 14. The auxiliary sewage discharge port 13 is used to discharge the sludge and other substances deposited between the sewage treatment tank 3 and the sewage receiving inner cylinder 16.

[0023] The above detailed description of the embodiments of the present invention is intended to be a preferred embodiment of the present invention and should not be construed as limiting the scope of implementation of the present invention. Any equivalent changes and improvements made within the scope of the present invention shall still fall within the scope of this patent.

Claims

1. A sewage treatment device for oil and gas field engineering environmental protection, comprising a sewage treatment tank, a water inlet pipe and an oil discharge pipe higher than the water inlet pipe provided on the upper side wall of the sewage treatment tank, a drain pipe provided on the lower side wall of the sewage treatment tank, a filter membrane provided on the inner end of the drain pipe, a mud discharge port provided at the center of the bottom surface of the sewage treatment tank, and an exhaust port provided at the top of the sewage treatment tank, characterized in that: The sewage treatment tank is provided with a sewage receiving inner cylinder concentric therewith, the lower end of the sewage receiving inner cylinder is connected and fixed to the bottom surface of the sewage treatment tank, the upper end is provided with a pressure cover and the center of the upper surface of the pressure cover is provided with a vertical pipe with an upper cap, the inner end of the water inlet pipe is connected to the side wall of the upper end of the vertical pipe, a water hole group is provided in the upper middle part of the sewage receiving inner cylinder, a conical filter screen cylinder concentric therewith is provided inside the sewage receiving inner cylinder, the upper end of the conical filter screen cylinder is connected to the lower end of the vertical pipe, and the lower end is connected and fixed to the bottom surface of the sewage treatment tank, an aeration structure is built into the lower part of the sewage treatment tank, and the sewage treatment tank is provided with a stirring mechanism above the aeration structure.

2. The sewage treatment device for oil and gas field engineering environmental protection according to claim 1 is characterized by: The aeration structure includes an annular ventilation pipeline fixed on the inner wall of the sewage treatment tank, multiple nozzles arranged on the upper surface of the annular ventilation pipeline, and an air intake pipeline connected to the annular ventilation pipeline. The outer end of the air intake pipeline passes through the sewage treatment tank and is provided with a one-way valve.

3. The sewage treatment device for oil and gas field engineering environmental protection according to claim 1 is characterized by: The stirring mechanism includes a linkage sleeve fixed on the vertical pipe by a bearing, a driven gear arranged at the upper end of the linkage sleeve, a rotating frame arranged at the lower end of the linkage sleeve, stirring paddles symmetrically arranged on both sides of the rotating frame, and a driving gear meshing with the driven gear. A motor reducer is fixed on the top of the sewage treatment tank, the output shaft of the motor reducer is connected and fixed to the axle of the driving gear, and the stirring paddle is located between the sewage treatment tank and the sewage receiving inner cylinder.

4. The sewage treatment device for oil and gas field engineering environmental protection according to claim 1 is characterized by: The bottom surface of the sewage treatment tank is a conical surface, and a secondary sewage outlet is provided at the lower end of the bottom surface corresponding to the position between the sewage treatment tank and the sewage receiving inner cylinder.

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