A skid-mounted produced water treatment device

Abstract

The present invention relates to a skid-mounted produced water treatment device in the technical field of oilfield produced water treatment, comprising: a chassis, a cyclone flotation tank and a box-type flotation tank, a steel frame is fixedly installed on the top of the chassis, and the cyclone flotation tank and the box-type flotation tank are respectively installed on both sides of the top of the steel frame; a sewage discharge component, the sewage discharge component is installed on the bottom of the cyclone flotation tank, the bottom of the box-type flotation tank and the top of the steel frame; a dissolved air water generation component, the dissolved air water generation component is installed on the steel frame. The present invention is designed as a skid-mounted structure, which is convenient for installation and transportation. Impurities such as oil stains are netted by the netting action of micro-bubble dissolved air water, forming a "carpet search" treatment effect of impurities such as oil stains, achieving efficient treatment performance, and changing the flow state of micro-bubble dissolved air water, so that impurities such as oil stains in produced sewage are fully in contact with micro-bubble dissolved air water, enhancing the capture efficiency of pollutants and improving work efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of oilfield produced water treatment, and in particular discloses a skid-mounted produced water treatment device. Background Art

[0002] With the development of oil and gas fields, the amount of water produced by oil and gas fields continues to increase, resulting in an increase in the operating load of the oil field water treatment system year by year. The water quality of the system is difficult to guarantee. At the same time, due to the continuous growth of water production in oil and gas fields, the number of water wells in production wells has gradually increased, and more and more wells need to be drained for gas production. At present, the existing oil and gas field produced water is mainly treated in a centralized manner at a joint station. The produced liquid from a single well is transported to a gas gathering station or an oil gathering station through a ground gathering pipeline network, and then piped to a joint station for treatment. The produced water from production wells in some remote blocks is concentrated in a joint station for treatment by tank trucks. In some areas, the produced water treatment process is mainly based on the "large tank sedimentation" method. The treated sewage is mostly used for reinjection into the formation or as a water source for gas injection boilers. The produced water from a few oil and gas fields is directly discharged into a sun-drying pool, an accident pool or a large evaporation field. The existing produced water treatment system has the following problems when in use: due to the complex water quality of produced water and the small size of oil droplets, the efficiency of oil removal by natural sedimentation is low, the produced water treatment system of the joint station is overloaded, and the method of transporting water to the joint station for treatment by tank trucks is inefficient, costly, and has certain traffic safety risks. The evaporation efficiency of sewage is low due to the influence of oil film covering the water surface in the drying pool, evaporation field and other pool facilities.

[0003] At present, in order to solve the problem of low efficiency in oil removal from produced water, a certain high-efficiency skid-mounted produced water treatment device on the market adopts a skid-mounted design and a combined process based on microbubble dissolved air water technology, which mainly uses air flotation to remove oil from produced water. The device uses a two-stage treatment of cyclone flotation and box-type air flotation to facilitate transportation and loading and unloading. It can also be operated in parallel or used in conjunction with the original produced water treatment system, and has a certain market share. However, when the microbubble dissolved air water in the high-efficiency skid-mounted produced water treatment device enters the cyclone flotation tank and the box-type air flotation tank, its flow state is always stable. The contact efficiency between produced sewage and microbubble dissolved air water cannot be improved, and the oil cannot be fully contacted with the microbubble dissolved air water, thereby reducing the working efficiency. Therefore, a skid-mounted produced water treatment device is proposed to improve the above problems. Summary of the invention

[0004] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that the flow state of the microbubble dissolved water in the produced water treatment device is always stable when it enters the cyclone flotation tank and the box-type flotation tank, so that the contact efficiency between the produced sewage and the microbubble dissolved water cannot be improved, thereby reducing the treatment efficiency.

[0005] In order to solve the above problems, the present invention provides a skid-mounted produced water treatment device, comprising:

[0006] A chassis, a cyclone flotation tank and a box-type flotation tank, wherein a steel frame is fixedly installed on the top of the chassis, and the cyclone flotation tank and the box-type flotation tank are respectively installed on both sides of the top of the steel frame;

[0007] A sewage discharge assembly, the sewage discharge assembly is installed on the bottom of the cyclone flotation tank, the bottom of the box-type flotation tank and the top of the steel frame;

[0008] A dissolved air water generating assembly, wherein the dissolved air water generating assembly is mounted on the steel frame;

[0009] A sewage inlet pipe is installed on one side of the cyclone flotation tank, and a first water outlet pipe is installed on the other side of the cyclone flotation tank near the bottom, a shield located in the cyclone flotation tank is fixedly installed on one end of the first water outlet pipe, and a filter is fixedly installed on the bottom of the inner wall of the shield, a first water guide pipe is installed on one end of the box-type air flotation tank, and a first water pump is fixedly installed on the top of the steel frame, the other end of the first water outlet pipe is fixedly connected to the inlet end of the first water pump, and one end of the first water guide pipe is fixedly connected to the outlet end of the first water pump;

[0010] The interior of the box-type air flotation box is movably provided with an upper baffle and a lower baffle which are equidistantly distributed, and the position of the upper baffle is staggered with the position of the lower baffle, and a disturbance plate is installed on one side of the upper baffle and one side of the lower baffle, and a disturbance component is arranged on the cyclone air flotation tank, the box-type air flotation box, the top of the upper baffle and the top of the lower baffle, and the disturbance component includes a mounting frame fixed on both sides of the top of the box-type air flotation box, and the inner wall of the mounting frame is rotatably connected to a crankshaft, a mounting sleeve is installed on one side of the cyclone air flotation tank, and the inner wall of the mounting sleeve is rotatably connected to a drive shaft through a sealed bearing, and the drive One end of the shaft extends to the interior of the cyclone flotation tank, one end of the drive shaft is fixedly installed with a disturbance frame, the top of the box-type flotation tank is provided with two rows of equally spaced guide holes, and the inner walls of the guide holes are fixed with sealing sleeves, two adjacent connecting rod journals of the crankshaft are movably sleeved with connecting rod frames, the bottom of the connecting rod frames are rotatably connected with a lifting frame passing through the sealing sleeve, the two lifting frames are respectively fixed to the top of the upper baffle and the top of the lower baffle, the other end of the drive shaft is fixedly connected to one end of the crankshaft, and a rotating mechanism for driving the drive shaft and the crankshaft to rotate is provided at one end of the top of the box-type flotation tank.

[0011] The present invention is further configured such that the rotating mechanism includes a gantry fixed to one end of the top of the box-type air flotation tank, and a motor is fixedly mounted on one side of the gantry, and gears are fixedly mounted on the output shaft of the motor and the outer wall of the drive shaft, and the two gears are meshed.

[0012] The present invention is further configured such that the disturbance frame includes a fixed sleeve fixed on the drive shaft, and the outer wall of the fixed sleeve is fixed with disturbance rods distributed in an annular shape with equal distances, and the disturbance rods are fixed with disturbance sheets distributed in an equal distances.

[0013] The present invention is further configured such that the sewage discharge assembly includes sewage pipes fixedly installed at the bottom of the cyclone flotation tank and the bottom of the box-type flotation tank, and sewage valves are fixedly installed at both ends of the sewage pipes, a sewage pump is fixedly installed on the steel frame, a first connecting pipe is fixedly installed between the inlet end of the sewage pump and the sewage pipe, and a waste pipe is fixedly installed at the outlet end of the sewage pump.

[0014] The present invention is further configured as follows: the dissolved air water generating component includes an air pump fixedly mounted on the steel frame, and a reflux pipe is fixedly mounted on the inlet end of the air pump, a normal-pressure gas inlet pipe is fixedly mounted on one side of the reflux pipe, a bubble refiner is fixedly mounted on one side of the top of the steel frame close to the air pump, and the inlet end of the bubble refiner is fixedly connected to the outlet end of the air pump, a three-way pipe is fixedly mounted on the outlet end of the bubble refiner, and a first micro-bubble inlet pipe is fixedly mounted on one end of the three-way pipe, a mounting port is provided on one side of the box-type air flotation tank, and an air intake hood is fixedly mounted on the inner wall of the mounting port, a second micro-bubble inlet pipe is fixedly connected to one end of the air intake hood and the other end of the three-way pipe, an air outlet distributed at equal distances is provided on one side of the air intake hood, and a release pipe is fixedly mounted on one side of the air outlet, and the release pipe is located between the upper baffle plate and the lower baffle plate.

[0015] The present invention is further configured such that one end of the first microbubble inlet pipe and one end of the return pipe both extend to the interior of the cyclone flotation tank, and the position of the first microbubble inlet pipe corresponds to the position of the sewage inlet pipe and the position of the disturbance frame, one end of the return pipe extends to the interior of the protective cover, and a through hole is provided on the filter screen for the return pipe to pass through.

[0016] The present invention is further configured such that an oil drain pipe is fixed to the middle position of the top of the cyclone flotation tank and to the top of one side of the box-type flotation tank, and an exhaust pipe is fixed to one side of the top of the cyclone flotation tank and to one side of the top of the box-type flotation tank.

[0017] The present invention is further configured such that a flow equalizing plate is fixedly installed on one side of the inner wall of the box-type air flotation box close to the first water conduit, and a second water outlet pipe is installed on the other side of the box-type air flotation box.

[0018] The present invention is further configured such that a dual-media filter and a second water pump are respectively installed on one side of the top of the steel frame, and a second water pipe is fixed on one side of the dual-media filter, one end of the second water pipe is fixedly connected to the outlet end of the second water pump, and one end of the second water outlet pipe is fixedly connected to the inlet end of the second water pump.

[0019] The present invention is further configured such that a third water outlet pipe is installed on the other side of the dual-media filter, and a third microbubble inlet pipe is fixed on the second microbubble inlet pipe, and the third microbubble inlet pipe is connected to the interior of the dual-media filter.

[0020] In summary, after adopting the above structure, the present invention has the following advantages compared with the prior art:

[0021] 1. The above-mentioned chassis, steel frame, sewage discharge assembly, dissolved air water generation assembly, cyclone flotation tank, box-type flotation tank, etc. are used to form the entire high-efficiency produced water treatment device, which is designed as a skid-mounted structure for easy installation and transportation, and the cyclone flotation tank and the box-type flotation tank are arranged adjacent to each other in sequence, thereby reducing the footprint of the entire treatment device;

[0022] 2. The above-mentioned dissolved air water generating assembly, cyclone flotation tank and box-type flotation tank are used. Under the suction action of the dissolved air pump in the dissolved air water generating assembly, part of the discharged water in the cyclone flotation tank can be absorbed, and combined with the external normal pressure gas to form a gas-water mixed flow, so that it enters the bubble refiner to achieve bubble refinement and large bubble separation, and finally forms micro-bubble dissolved air water after being decompressed by the release valve downstream of the bubble refiner. The micro-bubble dissolved air water is then introduced into the cyclone flotation tank along the first micro-bubble inlet pipe to be mixed with the produced sewage, and the micro-bubble dissolved air water is also introduced into the box-type flotation tank along the second micro-bubble inlet pipe, so that the micro-bubble dissolved air Water is released in a curtain-like manner in the box-type air flotation tank, so that the microbubble dissolved air water and the produced sewage are fully mixed, so that the oil and other impurities in the produced sewage can be netted under the netting effect of the microbubble dissolved air water, forming a "carpet-style search" treatment effect of oil and other impurities, greatly increasing the capture efficiency of the entire produced water treatment device for pollutants, achieving high-efficiency treatment performance, so that the entire produced water treatment device adopts a combined process based on air flotation developed based on microbubble dissolved air water technology, and removes oil from produced water through cyclone air flotation + box-type air flotation two-stage treatment, thereby improving the treatment performance of produced sewage;

[0023] 3. The above-mentioned cyclone flotation tank, box-type flotation tank, upper baffle, lower baffle, disturbance plate and disturbance assembly can be used to drive the gear, drive shaft and crankshaft to rotate under the driving action of the motor in the disturbance assembly. On the one hand, the disturbance frame is driven to rotate in the cyclone flotation tank, and the produced sewage and micro-bubble dissolved air water that will be washed away can be stirred, and the flow state of the micro-bubble dissolved air water in the cyclone flotation tank can be changed to make the two mixed fully. On the other hand, under the action of the crankshaft, two adjacent lifting frames can be driven to perform reciprocating lifting and lowering movements, thereby driving the upper baffle and the lower baffle to perform reciprocating lifting and lowering movements, cooperating with the disturbance plate to stir the micro-bubble dissolved air water released in a curtain shape, and changing the flow state of the micro-bubble dissolved air water in the box-type flotation tank, so that impurities such as oil in the produced sewage are fully in contact with the micro-bubble dissolved air water, further enhancing the capture efficiency of pollutants, and improving the working efficiency of the entire device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the three-dimensional structure of the first embodiment of the present application;

[0025] Figure 2 This is a schematic structural diagram of a dissolved air water generating assembly according to the first embodiment of the present application;

[0026] Figure 3 A cross-sectional view of a cyclone flotation tank and a box-type flotation tank according to the first embodiment of the present application;

[0027] Figure 4 This is a schematic diagram of the protective cover and filter structure of the first embodiment of the present application;

[0028] Figure 5 This is a schematic diagram of the disturbance frame and gear structure of the first embodiment of the present application;

[0029] Figure 6 This is a schematic diagram of the guide hole and sealing sleeve structure of the first embodiment of the present application;

[0030] Figure 7 This is a front cross-sectional view of the box-type air flotation tank according to the first embodiment of the present application;

[0031] Figure 8 This is a schematic diagram of the structure of the upper baffle and the lower baffle of the first embodiment of the present application;

[0032] Fig. 9 This is a process flow chart of the first embodiment of the present application;

[0033] Fig.10 This is a schematic diagram of the three-dimensional structure of the second embodiment of the present application;

[0034] Fig.11 This is a schematic diagram of the structure of the third microbubble inlet pipe and the second water conduit in the second embodiment of the present application;

[0035] Fig.12 This is a process flow chart of the second embodiment of the present application.

[0036] Description of the numbers in the figure:

[0037] 1. chassis; 2. steel frame; 3. sewage discharge assembly; 301. sewage pump; 302. waste pipe; 303. sewage pipe; 304. first connecting pipe; 4. dissolved air water generation assembly; 401. dissolved air pump; 402. three-way pipe; 403. second connecting pipe; 404. bubble refiner; 405. return pipe; 406. first micro bubble inlet pipe; 407. second micro bubble inlet pipe; 408. air inlet cover; 409. installation port; 410. release pipe; 411. normal pressure gas inlet pipe; 5. cyclone flotation tank; 6. sewage inlet pipe; 7. oil discharge pipe; 8. exhaust pipe; 9. first water pump; 10. disturbance assembly; 10 01. gantry; 1002. motor; 1003. crankshaft; 1004. mounting frame; 1005. lifting frame; 1006. disturbance frame; 1007. mounting sleeve; 1008. drive shaft; 1009. gear; 1010. guide hole; 1011. sealing sleeve; 11. box-type air flotation tank; 12. second water outlet pipe; 13. protective cover; 14. first water outlet pipe; 15. first water guide pipe; 16. upper baffle; 17. lower baffle; 18. flow equalizing plate; 19. filter; 20. disturbance plate; 21. second water pump; 22. dual-medium filter; 23. third micro-bubble inlet pipe; 24. second water guide pipe. DETAILED DESCRIPTION

[0038] The following describes two implementation modes of the present application in detail with reference to the accompanying drawings.

[0039] The first implementation method:

[0040] See also Figure 1-Figure 9 The present invention provides a skid-mounted produced water treatment device, comprising:

[0041] The chassis 1, the cyclone air flotation tank 5 and the box-type air flotation tank 11, the top of the chassis 1 is fixedly mounted with a steel frame 2, and the cyclone air flotation tank 5 and the box-type air flotation tank 11 are respectively mounted on both sides of the top of the steel frame 2;

[0042] A sewage discharge assembly 3 is installed at the bottom of the cyclone flotation tank 5, the bottom of the box-type flotation tank 11 and the top of the steel frame 2. The sewage discharge assembly 3 includes a sewage discharge pipe 303 fixedly installed at the bottom of the cyclone flotation tank 5 and the bottom of the box-type flotation tank 11, and sewage discharge valves are fixedly installed at both ends of the sewage discharge pipe 303. A sewage discharge pump 301 is fixedly installed on the steel frame 2. A first connecting pipe 304 is fixedly installed between the inlet end of the sewage discharge pump 301 and the sewage discharge pipe 303. A waste discharge pipe 302 is fixedly installed at the outlet end of the sewage discharge pump 301. When the sewage discharge valve is opened, impurities settled at the bottom of the cyclone flotation tank 5 and the box-type flotation tank 11 are conveniently discharged through the sewage discharge pump 301, the sewage discharge pipe 303 and the waste discharge pipe 302.

[0043] The dissolved air water generating component 4 is installed on the steel frame 2. The dissolved air water generating component 4 includes a dissolved air pump 401 fixedly installed on the steel frame 2, and a return pipe 405 is fixedly installed on the inlet end of the dissolved air pump 401, and a normal pressure gas inlet pipe 411 is fixedly installed on one side of the return pipe 405. A bubble refiner 404 is fixedly installed on one side of the top of the steel frame 2 close to the dissolved air pump 401, and the inlet end of the bubble refiner 404 is fixedly connected to the outlet end of the dissolved air pump 401, and the outlet end of the bubble refiner 404 is fixedly installed. A three-way pipe 402 is installed, and a first micro-bubble inlet pipe 406 is fixedly installed at one end of the three-way pipe 402. A mounting port 409 is opened on one side of the box-type air flotation tank 11, and an air inlet cover 408 is fixedly installed on the inner wall of the mounting port 409. One end of the air inlet cover 408 and the other end of the three-way pipe 402 are fixedly connected to a second micro-bubble inlet pipe 407. One side of the air inlet cover 408 is opened with air outlets distributed at equal distances, and a release pipe 410 is fixedly installed on one side of the air outlet. The release pipe 410 is located between the upper baffle plate 16 and the lower baffle plate 16. The air pump 401 in the air-dissolving water generating assembly 4 sucks water into the air-dissolving pump 401 along the reflux pipe 405 through the suction action of the air-dissolving pump 401, and also sucks the external normal-pressure gas into the air-dissolving pump 401 along the normal-pressure gas inlet pipe 411 to fully mix with the refluxed water to form an air-water mixed flow, and then guides the air-water mixed flow into the bubble refiner 404 through the second connecting pipe 403 to achieve bubble refinement and large bubble separation, and finally forms micro-bubble dissolved air water after being decompressed by the release valve downstream of the bubble refiner 404, so that the micro-bubble dissolved air water is separated. The bubble-dissolved water is introduced into the cyclone flotation tank 5 and the box-type flotation tank 11 along the first micro-bubble inlet pipe 406 and the second micro-bubble inlet pipe 407 respectively to mix with the produced sewage, and the impurities such as oil are captured by the net-catching function of the micro-bubble-dissolved water, forming a "carpet-style search" treatment method for impurities such as oil, thereby achieving efficient treatment performance, so that the entire produced water treatment device adopts a combined process based on air flotation developed based on the micro-bubble-dissolved water technology, and removes oil from the produced water through a two-stage treatment of cyclone flotation + box-type flotation;

[0044] A sewage inlet pipe 6 is installed on one side of the cyclone flotation tank 5, and a first water outlet pipe 14 is installed on the other side of the cyclone flotation tank 5 near the bottom, a shield 13 located in the cyclone flotation tank 5 is fixedly installed on one end of the first water outlet pipe 14, and a filter screen 19 is fixedly installed on the bottom of the inner wall of the shield 13, a first water guide pipe 15 is installed on one end of the box-type flotation tank 11, and a first water pump 9 is fixedly installed on the top of the steel frame 2, the other end of the first water outlet pipe 14 is fixedly connected to the inlet end of the first water pump 9, and one end of the first water guide pipe 15 is fixedly connected to the outlet end of the first water pump 9, and the treated water in the cyclone flotation tank 5 is sucked into the box-type flotation tank 11 through the first water pump 9 and the first water outlet pipe 14, so that the water flows from the cyclone flotation tank 5 into the box-type flotation tank 11 conveniently;

[0045] The interior of the box-type air flotation box 11 is movably provided with an upper baffle 16 and a lower baffle 17 which are equidistantly distributed, and the position of the upper baffle 16 is staggered with the position of the lower baffle 17. A disturbance plate 20 is installed on one side of the upper baffle 16 and one side of the lower baffle 17, and the disturbance plate 20 is oriented upward. A disturbance assembly 10 is arranged on the cyclone air flotation tank 5, the box-type air flotation box 11, the top of the upper baffle 16, and the top of the lower baffle 17. The disturbance assembly 10 includes a mounting frame 1004 fixed on both sides of the top of the box-type air flotation box 11, and the inner wall of the mounting frame 1004 is rotatably connected to a crankshaft 1003. A mounting sleeve 1007 is installed on one side of the cyclone air flotation tank 5, and the inner wall of the mounting sleeve 1007 is rotatably connected to the crankshaft 1003 through a sealed bearing. There is a driving shaft 1008, one end of the driving shaft 1008 extends to the interior of the cyclone flotation tank 5, one end of the driving shaft 1008 is fixedly installed with a disturbance frame 1006, the disturbance frame 1006 includes a fixed sleeve fixed on the driving shaft 1008, and the outer wall of the fixed sleeve is fixed with disturbance rods distributed in an annular shape with equal distances, and the disturbance rods are fixed with disturbance plates distributed at equal distances. The top of the box-type flotation tank 11 is provided with two rows of guide holes 1010 distributed at equal distances, and the inner walls of the guide holes 1010 are fixed with sealing sleeves 1011. Connecting rod frames are movably sleeved on two adjacent connecting rod journals of the crankshaft 1003, and the bottom of the connecting rod frame is rotatably connected with a lifting frame 1005 passing through the sealing sleeve 1011, and the two lifting frames 10 05 are respectively fixed to the top of the upper baffle 16 and the top of the lower baffle 17, the other end of the drive shaft 1008 is fixedly connected to one end of the crankshaft 1003, and a rotating mechanism for driving the drive shaft 1008 and the crankshaft 1003 to rotate is provided at the top end of the box-type air flotation box 11, and a motor 1002 is fixedly installed on one side of the gantry 1001, and a gear 1009 is fixedly installed on the output shaft of the motor 1002 and the outer wall of the drive shaft 1008, and the two gears 1009 are meshed, and the gear 1009, the drive shaft 1008 and the crankshaft 1003 are driven by the driving action of the motor 1002 in the disturbance component 10 3 rotates, on the one hand, it drives the disturbance frame 1006 to rotate in the cyclone flotation tank 5, which can stir the produced sewage and the micro-bubble dissolved air water that will be washed away, change the flow state of the micro-bubble dissolved air water in the cyclone flotation tank 5, and make the two mixed fully; on the other hand, it can drive the two adjacent lifting frames 1005 to make reciprocating lifting motion under the action of the crankshaft 1003, drive the upper baffle plate 16 and the lower baffle plate 17 to make reciprocating lifting motion, cooperate with the disturbance plate 20 to stir the micro-bubble dissolved air water released in a curtain shape, change the flow state of the micro-bubble dissolved air water in the box-type flotation box 11, make the impurities such as oil in the produced sewage fully contact with the micro-bubble dissolved air water, further enhance the capture efficiency of pollutants, and improve the working efficiency of the whole device.

[0046] In the present invention, one end of the first microbubble inlet pipe 406 and one end of the return pipe 405 are both extended to the interior of the cyclone flotation tank 5, and the position of the first microbubble inlet pipe 406 corresponds to the position of the sewage inlet pipe 6 and the position of the disturbance frame 1006, one end of the return pipe 405 extends to the interior of the shield 13, the filter screen 19 is provided with a through hole for the return pipe 405 to pass through, and the first microbubble inlet pipe 406 and the second microbubble inlet pipe 407 are both provided with a first one-way valve, such as Figure 1 and Figure 3 As shown, the sewage inlet pipe 6 and the first microbubble inlet pipe 406 can be collided, so that the produced sewage can contact the microbubble dissolved water at the first time.

[0047] In the present invention, an oil discharge pipe 7 is fixed to the middle position of the top of the cyclone flotation tank 5 and to the top of one side of the box-type flotation tank 11, and an exhaust pipe 8 is fixed to one side of the top of the cyclone flotation tank 5 and to one side of the top of the box-type flotation tank 11. The two exhaust pipes 8 are connected. Figure 1 As shown, the oil discharge pipe 7 is used to discharge the captured impurities such as oil stains, and the exhaust pipe 8 is also used to perform exhaust and pressure relief operations in the cyclone flotation tank 5 and the box-type flotation tank 11.

[0048] In the present invention, a flow equalizing plate 18 is fixedly installed on one side of the inner wall of the box-type air flotation box 11 close to the first water conduit 15, and a second water outlet pipe 12 is installed on the other side of the box-type air flotation box 11. Figure 3 and Figure 7 As shown, the above-mentioned flow equalizing plate 18 can be used to equalize the water introduced into the box-type air flotation box 11, so that the water can flow smoothly and evenly distributed in the box-type air flotation box 11.

[0049] In summary, the working principle of the present invention is as follows: the chassis 1, the steel frame 2, the sewage discharge component 3, the dissolved air water generating component 4, the cyclone flotation tank 5, the box-type flotation tank 11, etc. are used to form the entire high-efficiency produced water treatment device, so that it is designed as a skid-mounted structure. When working, the user uses a water pump to introduce the oil field produced sewage into the cyclone flotation tank 5 along the sewage inlet pipe 6. At this time, part of the produced sewage will be filtered by the filter screen 19 and enter the protective cover 13. Then, the user uses the suction effect of the dissolved air pump 401 in the dissolved air water generating component 4 to suck the moisture in the protective cover 13 into the dissolved air pump 401 along the reflux pipe 405, and also sucks the external normal-pressure gas into the dissolved air pump 401 along the normal-pressure gas inlet pipe 411 to fully mix with the refluxed moisture to form The gas-water mixed flow is then introduced into the bubble refiner 404 through the second connecting pipe 403 to achieve bubble refinement and large bubble separation, and finally forms micro-bubble dissolved water after being decompressed by the release valve downstream of the bubble refiner 404; then, the user introduces the micro-bubble dissolved water into the cyclone flotation tank 5 along the first micro-bubble inlet pipe 406 to mix with the produced sewage, and captures impurities such as oil and dirt in the cyclone flotation tank 5 through the net capture function of the micro-bubble dissolved water; then, the first water pump 9 is used in conjunction with the first water outlet pipe 14 to suck the treated water in the cyclone flotation tank 5 into the box-type flotation tank 11, and after being equalized by the flow equalizing plate 18, it circulates between the upper baffle 16 and the lower baffle 17, and at this time, the micro-bubble dissolved water is also introduced into the cyclone flotation tank 5 along the second micro-bubble inlet pipe 407 is introduced into the box-type air flotation tank 11, so that the micro-bubble dissolved air water enters the box-type air flotation tank 11 in the form of multiple fluids through the air inlet cover 408 and the release tube 410, forming a curtain-like release, so that the micro-bubble dissolved air water is fully mixed with the produced sewage, so that the oil and other impurities in the produced sewage can be further netted under the netting effect of the micro-bubble dissolved air water, forming a "carpet-style search" treatment method for oil and other impurities, achieving efficient treatment performance, so that the entire produced water treatment device adopts a combined process based on air flotation developed based on the micro-bubble dissolved air water technology, and removes oil from the produced water through a two-stage treatment of cyclone air flotation + box-type air flotation; and in the oil removal process, the user disturbs the motor 100 in the component 10. 2 drives the gear 1009, the drive shaft 1008 and the crankshaft 1003 to rotate. On the one hand, it drives the disturbance frame 1006 to rotate in the cyclone flotation tank 5, which can stir the produced sewage and the micro-bubble dissolved water that will be washed away, change the flow state of the micro-bubble dissolved water in the cyclone flotation tank 5, and make the two fully mixed. On the other hand, it can drive the two adjacent lifting frames 1005 to make reciprocating lifting movements under the action of the crankshaft 1003, drive the upper baffle 16 and the lower baffle 17 to make reciprocating lifting movements, cooperate with the disturbance plate 20 to stir the micro-bubble dissolved water released in a curtain shape, change the flow state of the micro-bubble dissolved water in the box-type flotation box 11, so that the impurities such as oil in the produced sewage are fully in contact with the micro-bubble dissolved water;Finally, the water is discharged through the second water outlet pipe 12, and the sewage valve is also opened to discharge the impurities settled at the bottom of the cyclone flotation tank 5 and the box-type flotation tank 11 through the sewage pump 301, the sewage pipe 303 and the waste pipe 302. ;

[0050] Second implementation method:

[0051] See also Figure 10-12 On the basis of Embodiment 1, this embodiment adds the following structure, so that the present application has a multi-stage decontamination function, and the specific configuration is as follows: a dual-media filter 22 and a second water pump 21 are respectively installed on one side of the top of the steel frame 2, and a second water guide pipe 24 is fixed on one side of the dual-media filter 22, one end of the second water guide pipe 24 is fixedly connected to the outlet end of the second water pump 21, one end of the second water outlet pipe 12 is fixedly connected to the inlet end of the second water pump 21, a third water outlet pipe is installed on the other side of the dual-media filter 22, and the second microbubble filter 24 is fixedly connected to the outlet end of the second water pump 21, and the second microbubble filter 24 is fixedly connected to the inlet end of the second water pump 21. A third microbubble inlet pipe 23 is fixed on the inlet pipe 407, and the third microbubble inlet pipe 23 is connected to the interior of the dual-media filter 22. A second one-way valve is provided on the third microbubble inlet pipe 23. By using the second water pump 21, the dual-media filter 22 and the third microbubble inlet pipe 23, the water after the two-stage treatment of cyclone flotation + box-type flotation can be introduced into the dual-media filter 22 for another filtering operation under the action of the second water pump 21, and microbubble dissolved water can be introduced at the same time, so that the whole device has a three-stage decontamination function and a stronger decontamination performance.

[0052] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A skid-mounted produced water treatment device, characterized in that: include: A chassis (1), a cyclone flotation tank (5) and a box-type flotation tank (11), wherein a steel frame (2) is fixedly mounted on the top of the chassis (1), and the cyclone flotation tank (5) and the box-type flotation tank (11) are respectively mounted on both sides of the top of the steel frame (2); A sewage discharge assembly (3), the sewage discharge assembly (3) being installed on the bottom of the cyclone flotation tank (5), the bottom of the box-type flotation tank (11) and the top of the steel frame (2); A dissolved air water generating component (4), wherein the dissolved air water generating component (4) is installed on the steel frame (2); A sewage inlet pipe (6) is installed on one side of the cyclone flotation tank (5), and a first water outlet pipe (14) is installed on the other side of the cyclone flotation tank (5) near the bottom; a shield (13) located in the cyclone flotation tank (5) is fixedly installed on one end of the first water outlet pipe (14), and a filter screen (19) is fixedly installed on the bottom of the inner wall of the shield (13); a first water guide pipe (15) is installed on one end of the box-type flotation tank (11), and a first water pump (9) is fixedly installed on the top of the steel frame (2); the other end of the first water outlet pipe (14) is fixedly connected to the inlet end of the first water pump (9), and one end of the first water guide pipe (15) is fixedly connected to the outlet end of the first water pump (9); An upper baffle (16) and a lower baffle (17) are movably arranged inside the box-type air flotation tank (11) at equal intervals, and the position of the upper baffle (16) is staggered with the position of the lower baffle (17). A disturbance plate (20) is installed on one side of the upper baffle (16) and one side of the lower baffle (17). A disturbance component (10) is arranged on the cyclone air flotation tank (5), the box-type air flotation tank (11), the top of the upper baffle (16), and the top of the lower baffle (17). The disturbance component (10) comprises a mounting frame (1004) fixed on both sides of the top of the box-type air flotation tank (11), and the inner wall of the mounting frame (1004) is rotatably connected to a crankshaft (1003). A mounting sleeve (1007) is installed on one side of the cyclone air flotation tank (5), and the inner wall of the mounting sleeve (1007) is rotatably connected to a drive shaft (1008) via a sealed bearing. The drive shaft (1008) is rotatably connected to the drive shaft (1008). 008) extends into the interior of the cyclone flotation tank (5); a disturbance frame (1006) is fixedly mounted on one end of the drive shaft (1008); two rows of equally spaced guide holes (1010) are opened on the top of the box-type flotation tank (11); and sealing sleeves (1011) are fixedly mounted on the inner walls of the guide holes (1010); connecting rod frames are movably sleeved on two adjacent connecting rod journals of the crankshaft (1003); and the bottoms of the connecting rod frames are rotatably connected to lifting frames (1005) passing through the sealing sleeves (1011); the two lifting frames (1005) are respectively fixed to the top of the upper baffle (16) and the top of the lower baffle (17); the other end of the drive shaft (1008) is fixedly connected to one end of the crankshaft (1003); and a rotating mechanism for driving the drive shaft (1008) and the crankshaft (1003) to rotate is disposed at one end of the top of the box-type flotation tank (11).

2. A skid-mounted produced water treatment device according to claim 1, characterized in that: The rotating mechanism comprises a gantry (1001) fixed to one end of the top of the box-type air flotation tank (11), and a motor (1002) is fixedly mounted on one side of the gantry (1001), and gears (1009) are fixedly mounted on the output shaft of the motor (1002) and the outer wall of the driving shaft (1008), and the two gears (1009) are meshed with each other.

3. A skid-mounted produced water treatment device according to claim 2, characterized in that: The disturbance frame (1006) comprises a fixed sleeve fixed on the driving shaft (1008), and the outer wall of the fixed sleeve is fixed with disturbance rods distributed in an annular shape at equal distances, and disturbance plates distributed at equal distances are fixed on the disturbance rods.

4. A skid-mounted produced water treatment device according to claim 3, characterized in that: The sewage discharge assembly (3) comprises a sewage discharge pipe (303) fixedly mounted on the bottom of the cyclone flotation tank (5) and the bottom of the box-type flotation tank (11), and sewage discharge valves are fixedly mounted on both ends of the sewage discharge pipe (303), a sewage discharge pump (301) is fixedly mounted on the steel frame (2), a first connecting pipe (304) is fixedly mounted between the inlet end of the sewage discharge pump (301) and the sewage discharge pipe (303), and a waste discharge pipe (302) is fixedly mounted on the outlet end of the sewage discharge pump (301).

5. The skid-mounted produced water treatment device according to claim 4, characterized in that: The dissolved air water generating assembly (4) comprises an air pump (401) fixedly mounted on the steel frame (2), and a return pipe (405) is fixedly mounted on the inlet end of the air pump (401), and a normal pressure gas inlet pipe (411) is fixedly mounted on one side of the return pipe (405), and a bubble refiner (404) is fixedly mounted on one side of the steel frame (2) close to the top of the air pump (401), and the inlet end of the bubble refiner (404) is fixedly connected to the outlet end of the air pump (401), and a three-way pipe (402) is fixedly mounted on the outlet end of the bubble refiner (404), and the three-way pipe (411) is fixedly mounted on the outlet end of the bubble refiner (404). A first microbubble inlet pipe (406) is fixedly installed at one end of (402), a mounting port (409) is provided on one side of the box-type air flotation box (11), and an air inlet cover (408) is fixedly installed on the inner wall of the mounting port (409), one end of the air inlet cover (408) and the other end of the three-way pipe (402) are fixedly connected with a second microbubble inlet pipe (407), one side of the air inlet cover (408) is provided with air outlets distributed at equal distances, and a release pipe (410) is fixedly installed on one side of the air outlet, and the release pipe (410) is located between the upper baffle plate (16) and the lower baffle plate (17).

6. The skid-mounted produced water treatment device according to claim 5, characterized in that: One end of the first microbubble inlet pipe (406) and one end of the return pipe (405) both extend to the interior of the cyclone flotation tank (5), and the position of the first microbubble inlet pipe (406) corresponds to the position of the sewage inlet pipe (6) and the position of the disturbance frame (1006), one end of the return pipe (405) extends to the interior of the protective cover (13), and a through hole for the return pipe (405) to pass through is provided on the filter screen (19).

7. The skid-mounted produced water treatment device according to claim 6, characterized in that: An oil discharge pipe (7) is fixed to the middle position of the top of the cyclone flotation tank (5) and to the top of one side of the box-type flotation tank (11), and an exhaust pipe (8) is fixed to one side of the top of the cyclone flotation tank (5) and to one side of the top of the box-type flotation tank (11).

8. The skid-mounted produced water treatment device according to claim 7, characterized in that: A flow equalizing plate (18) is fixedly mounted on one side of the inner wall of the box-type air flotation box (11) close to the first water conduit (15), and a second water outlet pipe (12) is mounted on the other side of the box-type air flotation box (11).

9. The skid-mounted produced water treatment device according to claim 8, characterized in that: A dual-medium filter (22) and a second water pump (21) are respectively installed on one side of the top of the steel frame (2), and a second water guide pipe (24) is fixed to one side of the dual-medium filter (22), one end of the second water guide pipe (24) is fixedly connected to the outlet end of the second water pump (21), and one end of the second water outlet pipe (12) is fixedly connected to the inlet end of the second water pump (21).

10. The skid-mounted produced water treatment device according to claim 9, characterized in that: A third water outlet pipe is installed on the other side of the dual-media filter (22), and a third micro-bubble inlet pipe (23) is fixed on the second micro-bubble inlet pipe (407), and the third micro-bubble inlet pipe (23) is connected to the interior of the dual-media filter (22).

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