CN117699926A - Electromagnetic coupling copolymerization multistage air floatation oil removal device and method - Google Patents
Electromagnetic coupling copolymerization multistage air floatation oil removal device and method Download PDFInfo
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Abstract
The invention provides an electromagnetic coupling copolymerization multistage air floatation degreasing device and method, which belong to the technical field of oilfield produced water treatment standard reaching, and utilize an electromagnetic coupling copolymerization technology to emulsify oil drops or micro bubbles and a mixed solution of produced water into an interaction area of an electric field and a magnetic field, wherein all energized produced water micro-clusters are subjected to electromagnetic force, but the oil drops and the bubbles (seen as round insulating particles) in the produced water are not conductive and are not subjected to electromagnetic force, and opposite acting force is obtained due to relative movement and extrusion of surrounding produced water micro-clusters, the force is equal to the electromagnetic force in size and opposite direction, and the reinforced relative movement of the oil drops with different sizes and densities is generated after the force is obtained, so that the probability of mutual collision is increased, and the capture of the oil drops to the bubbles is enhanced and the successful adhesion flotation is carried out.
Description
Technical Field
The invention belongs to the technical field of oilfield produced water treatment reaching standards, and particularly relates to an electromagnetic coupling copolymerization multistage air floatation oil removal device and method.
Background
Oil and gas remain the primary energy sources today, requiring significant production to sustain the needs of human production activities. However, the yield of the produced water of the main byproducts in the exploitation process is huge, the water content of the produced water is up to more than 70%, and the water content of the produced water of part of oil fields is up to more than 90%. To enhance oil recovery, a reinjection of produced water is typically used to maintain reservoir pressure further increasing the water content of the produced water. The large amount of produced water increases the energy consumption and the separation treatment difficulty in the gathering and transportation process, so that the preliminary oil-water separation on a platform is needed to enable the produced water to be reinjected or discharged after reaching the standard so as to reduce the gathering and transportation pressure. The emulsified oil drops dispersed in the produced water are stable in property, have the density close to that of the water phase, and are particularly difficult to treat by common gravity sedimentation. He flows into the water stream or ocean due to evaporation and permeates into the ground, which can cause serious harm to the atmosphere, water and soil. The oil content of the discharged wastewater should be less than 30mg/L according to the relevant regulations, which is generally applicable around the world. Currently, the emulsified oil droplets in treated water are mainly divided into physical methods, chemical methods and biological separation technologies. Wherein, the air floatation is widely applied to removing emulsified oil drops in the produced water due to the advantages of large treatment capacity, low energy consumption and the like.
The air floatation is a water treatment process for realizing solid-liquid separation or liquid-liquid separation by generating a large number of micro bubbles in water through an air dissolving system, enabling air to be attached to suspended particles in the form of highly dispersed micro bubbles to cause a state that the density is smaller than that of water, and floating the suspended particles on the water surface by utilizing a buoyancy principle. However, under the condition of no dosing, the adhesion effect of oil drops and bubbles is poor, the flotation efficiency is generally lower than 70%, the oil concentration at the water outlet of the three-phase separator is unstable, and the excessive oil concentration can exceed the working load of a single-stage or double-stage flotation tank, so that the flotation effect is reduced. The nano bubble technology assists micro bubble flotation, nano bubbles act as bridging long-range gravitation when oil drops and bubbles adhere, flotation effect is improved to a certain extent, and flotation efficiency is still 70% when no flocculant is added. By coupling flotation and cyclone separation work, the oil removal efficiency of the cyclone separator can be improved from 58% to 72% by introducing microbubbles into an axial flow cyclone separator to strengthen the cyclone separation of emulsified oil drops, but still further treatment is required to reach reinjection and discharge standards. The flotation effect is enhanced by adding a large amount of flocculation/coagulant but the investment is increased and secondary pollution is introduced.
Disclosure of Invention
The invention provides an electromagnetic coupling copolymerization multistage air floatation oil removal device and method for solving the problems that in existing produced water treatment equipment of an existing ocean platform, produced water is high in oil concentration, treatment is not up to standard, and medicament investment is high. By utilizing electromagnetic coupling copolymerization technology, the mixed liquid of emulsified oil drops or microbubbles and produced water enters the interaction area of an electric field and a magnetic field, all energized produced water micelles are subjected to electromagnetic force, but the oil drops and bubbles (seen as round insulating particles) in the produced water are not conductive and are not subjected to electromagnetic force, but opposite acting force is obtained due to the relative movement and extrusion of the surrounding produced water micelles, the force is equal to the electromagnetic force in size and opposite in direction, and the oil drops with different sizes and densities are subjected to intensified relative movement after the force is obtained, so that the mutual collision probability is increased, and the capture of the oil drops to the bubbles and the successful adhesion flotation are enhanced.
In order to achieve the above object, the present invention is realized by the following technical scheme:
in a first aspect, the present invention provides an electromagnetic coupling copolymerization multistage air floatation degreasing device, including:
the device comprises a multi-stage air floatation tank main body, a bubble preparation system, an electromagnetic copolymerization system and a multi-stage floatation system; the air bubble preparation system is arranged outside the multi-stage air flotation tank main body, and the electromagnetic copolymerization system and the multi-stage flotation system are arranged inside the multi-stage air flotation tank main body;
the bottom of the multistage air floatation tank main body is provided with a treated water outlet and a plurality of bubble inflow inlets, and the bubble preparation system comprises a booster pump and a bubble generator; the treated water outlet is sequentially connected with a booster pump and a bubble generator, and the outlet pipeline of the bubble generator is respectively connected with a plurality of bubble inflow inlets; the electromagnetic copolymerization system comprises a plurality of positive electrode plates and a plurality of magnets, wherein the magnets are arranged between the positive electrode plates and the negative electrode plates, and the multistage flotation system is formed in the multistage air flotation tank main body; the multistage flotation system comprises five flotation areas which are connected in series, wherein each flotation area comprises a first electromagnetic coupling copolymerization flotation area, a first conventional flotation area, an electromagnetic coupling flocculation coalescence area, a second electromagnetic coupling copolymerization flotation area and a second conventional flotation area which are connected in series in sequence, a baffle is arranged at the upper end between the electromagnetic coupling flocculation coalescence area and the second electromagnetic coupling copolymerization flotation area, and a gap is reserved between the top end of the baffle and the top of the multistage floatation tank main body; and a flocculant outlet is arranged on the positive electrode plate in the electromagnetic coupling flocculation coalescence region, and faces the electromagnetic coupling flocculation coalescence region.
Further, the treated water is directly discharged outside through a part of the treated water outlet, and the other part of the treated water is added through a booster pump, then enters the bubble generator to generate bubbles, and the bubbles are discharged from an outlet pipeline of the bubble generator and enter the multistage air floatation tank body through the bubble inflow port.
Further, a produced water inlet is formed in the bottom of the multistage air floatation tank body, close to the first electromagnetic coupling copolymerization floatation area, and the air bubble inflow port comprises a first air bubble inflow port arranged below the first electromagnetic coupling copolymerization floatation area, a second air bubble inflow port arranged below the first conventional floatation area, a third air bubble inflow port arranged below the second electromagnetic coupling copolymerization floatation area and a fourth air bubble inflow port arranged in the second conventional floatation area; the produced water and bubbles are mixed and flow upwards in the first electromagnetic coupling copolymerization flotation area under the action of the first bubble inflow port.
Further, the produced water is subjected to downward electromagnetic force, bubbles and oil drops in the produced water move upwards due to non-conduction and no electromagnetic force, and in the upward movement process, the oil drops are captured by the bubbles and successfully adhere to flotation to form floating oil and enter a first conventional flotation area.
Further, under the action of the second bubble inflow port, after the floating oil is subjected to flotation separation in the first conventional flotation area, the floating oil directly enters the second conventional flotation area from the upper end of the baffle plate, and part of produced water containing oil drops which are not captured by bubbles enters the electromagnetic coupling flocculation coalescence area.
Further, after the produced water and the flocculating agent enter the electromagnetic coupling flocculation coalescence area, the produced water is subjected to upward electromagnetic force, so that the produced water carrying the flocculating agent flows after being subjected to upward acting force to generate hysteresis; the oil drops are rapidly moved to the bottom of the electromagnetic coupling flocculation coalescence area under the downward acting force, and collide with the flocculating agent in the downward movement process of the oil drops to form large flocs and oil drop groups.
Further, the large flocs and oil drop groups enter a second electromagnetic coupling copolymerization flotation area from the bottom of the electromagnetic coupling flocculation coalescence area; after the large flocs and oil drop groups enter the second electromagnetic coupling copolymerization flotation area, the produced water receives downward electromagnetic force in the second electromagnetic coupling copolymerization flotation area; the bubbles, large flocs and oil drop groups generated by the third bubble inflow port move upwards due to non-conduction and no electromagnetic force, and in the upward movement process, the large flocs and oil drop groups are captured by the bubbles and successfully adhere to flotation and enter a second conventional flotation region.
Further, in the second conventional flotation region, large flocs and oil drop groups adhered with bubbles quickly float up to the upper part of the multi-stage floatation tank main body, and few oil drops which are not captured can be captured by bubbles generated by the fourth bubble inflow port and float up to the upper part of the multi-stage floatation tank main body; pure produced water is discharged from a treated water outlet at the bottom or returned to the bubble preparation system.
Further, the positive electrode plate and the negative electrode plate are parallel and equal in size, the magnetic body is attached to the inner wall of the multi-stage air floatation tank body and tangent to the edges of the positive electrode plate and the negative electrode plate, and N stages are outwards.
In a second aspect, the invention provides an oil removing method based on an electromagnetic coupling copolymerization multistage air floatation oil removing device, which comprises the following steps:
after entering a multi-stage floatation tank main body, the produced water enters a first electromagnetic coupling copolymerization floatation area together with bubbles, oil drops in the produced water in the first electromagnetic coupling copolymerization floatation area are captured by the bubbles and successfully adhere to floatation to form floating oil and enter a first conventional floatation area, the floating oil directly enters a second conventional floatation area from the upper end of a baffle, and part of the produced water containing the oil drops which are not captured by the bubbles enters an electromagnetic coupling flocculation coalescence area;
in the electromagnetic coupling flocculation coalescence area, oil drops collide with a flocculating agent to form large flocs and oil drop groups;
large flocs and oil drop groups enter a second electromagnetic coupling copolymerization flotation area from the bottom of the electromagnetic coupling flocculation coalescence area; large flocs and oil drop groups are captured by bubbles and successfully adhere to flotation and enter a second conventional flotation area, and finally float to the upper part of the multi-stage air floatation tank main body;
in the second conventional flotation region, a very small portion of the non-captured oil droplets are captured by the air bubbles and float up to the upper portion of the multi-stage flotation tank body; pure produced water is discharged from a treated water outlet at the bottom or returned to the bubble preparation system.
Compared with the prior art, the invention has the beneficial effects that:
the invention can be applied to the treatment of the produced liquid of the ocean platform oil field to obtain the treated water with the discharge and reinjection reaching the standards, reduce the energy consumption of gathering and transportation and improve the oil-water separation efficiency. The capturing and accelerating separation of the bubbles to the oil drops are enhanced through electromagnetic copolymerization. In the process, physical methods such as electromagnetic copolymerization, air floatation and the like are used for strengthening the gravity separation effect, so that the oil-water separation efficiency is greatly improved, and the secondary pollution to the water body caused by the use of a flocculating agent is reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments and are incorporated in and constitute a part of this specification, illustrate and explain the embodiments and together with the description serve to explain the embodiments.
FIG. 1 is a schematic diagram of an electromagnetic coupling copolymerization multistage air floatation degreasing device;
FIG. 2 is a schematic diagram of the stress of water micro-clusters, bubbles and oil drops produced in the electromagnetic coupling copolymerization area;
FIG. 3 is a schematic diagram showing the evolution of the collision adhesion process of the relative movement of oil drops and bubbles or flocculant long chains in the electromagnetic coupling copolymerization region;
wherein, 1 multistage air supporting pond main part, 2 bubble generator, 3 booster pump, 4 first positive electrode plate (A district), 5 anticorrosive oleophobic coating, 6 first magnet (A district), 7 baffle, 8 valves, 9 extraction water entry, 10 first bubble inflow port (A district), 11 second bubble inflow port (B district), 12 third bubble inflow port (D district), 13 fourth bubble inflow port (E district), 14 treatment water export, 15 oil export, 16 flocculant export, 17 first negative electrode plate (A district), 18 second negative electrode plate (C district), 19 second magnet (C district), 20 second positive electrode plate (CD district), 21 third magnet (D district), 22 third negative electrode plate (D district), 23 baffle.
Detailed Description
The invention will be further described with reference to the drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
Example 1:
as shown in fig. 1, this embodiment provides an electromagnetic coupling copolymerization multistage air-floatation degreasing device, which includes: the multi-stage air flotation device comprises a multi-stage air flotation tank main body, an electromagnetic copolymerization system and a multi-stage flotation system which are arranged inside the multi-stage air flotation tank main body, and a bubble preparation system which is arranged outside the multi-stage air flotation tank main body.
The bottom of the multi-stage air floatation tank main body is provided with a treated water outlet 14 and a plurality of air bubble inflow inlets, four air bubble inflow inlets are arranged in the embodiment, namely a first air bubble inflow inlet 10, a second air bubble inflow inlet 11, a third air bubble inflow inlet 12 and a fourth air bubble inflow inlet 13, the air bubble preparation system comprises a booster pump 3 and an air bubble generator 2, the treated water outlet is sequentially connected with the booster pump and the air bubble generator, part of treated water is directly discharged outside through the treated water outlet, the other part of the treated water flows back to the air bubble generator after being increased through the booster pump, air bubbles are generated, and the air bubbles are discharged from an outlet pipeline of the air bubble generator to enter the multi-stage air floatation tank main body through the four air bubble inflow inlets.
The electromagnetic copolymerization system comprises a plurality of positive electrode plates, negative electrode plates and a plurality of magnets, wherein the electrode plates are wrapped by an anti-corrosion oil-conveying layer 5, the service life of the electrode plates can be prolonged by the anti-corrosion coating, and the anti-corrosion oil-conveying layer has oleophobic property and can prevent oil drops in water from adhering and coalescing on the electrode plates to influence discharge. As shown in fig. 1, the electromagnetic copolymerization system comprises a first positive electrode plate 4, a first magnet 6, a first negative electrode plate 17, a second negative electrode plate 18, a second magnet 19, a second positive electrode plate 20, a third magnet 21 and a third negative electrode plate which are sequentially arranged, that is, the magnets are arranged between the positive electrode plate and the negative electrode plate, a multistage flotation system is formed in the multistage air flotation tank body, the multistage flotation system comprises five flotation areas which are connected in series, each of the five flotation areas comprises a first electromagnetic coupling copolymerization flotation area, a first conventional flotation area, an electromagnetic coupling flocculation coalescence area, a second electromagnetic coupling copolymerization flotation area and a second conventional flotation area which are sequentially connected in series, wherein a baffle 23 is arranged at the upper end between the electromagnetic coupling flocculation coalescence area and the second electromagnetic coupling copolymerization flotation area, and a gap is reserved between the top end of the baffle and the top of the multistage air flotation tank body.
The bottom of the multistage air floatation tank main body is provided with a produced water inlet 9 close to the first electromagnetic coupling copolymerization floatation area, and oilfield produced water enters the multistage air floatation tank main body from the produced water inlet together with bubbles generated by the first bubble inflow opening and then flows upwards in a mixing way in the first electromagnetic coupling copolymerization floatation area. As shown in fig. 2, the current direction (I) and the magnetic field direction (B) are given. When the bubbles and the oil drops in the produced water enter the first electromagnetic coupling copolymerization flotation area, all the conductive produced water micro-clusters are subjected to the action of downward electromagnetic Force (FM), but the bubbles and the oil drops in the produced water (seen as round insulating particles) are not subjected to the action of electromagnetic force, but the upward acting force is obtained due to the relative motion and extrusion of the surrounding produced water micro-clusters, the force is equal to the electromagnetic force in opposite directions (FOSM and FBSM), and the resultant Force (FB) to which the bubbles are subjected is the sum of the upward electromagnetic reaction Force (FBSM) and buoyancy force (FBF) due to the negligible gas mass gravity (FBg) of the bubbles, so that the bubbles are accelerated to float upwards. The oil drops are close to the water phase in density, and the gravity (FOg) is equal to the buoyancy (FOF) and opposite to the buoyancy, so that the resultant Force (FB) of the bubbles is upward electromagnetic reaction Force (FOSM). The upward flow hysteresis of the produced water due to the downward acting electromagnetic force increases the probability of mutual collision due to the enhanced upward relative movement of the oil droplets of unequal size and density after the reaction force is obtained, enhances the probability of the oil droplets being captured by the air bubbles and successfully adheres to the flotation to form the floating oil and enters the first conventional flotation zone. Whereas for oil droplets not captured by the bubbles, the flotation is accelerated by the upward reaction force and rises and enters the first conventional flotation zone. The adhesion promotion phenomenon of the oil droplets and bubbles after being forced in the electromagnetic copolymerization zone is given by fig. 3. In the first electromagnetic coupling copolymerization flotation area, as the magnitudes of the forces borne by the oil drops and the bubbles are different, the oil drop floating speed is increased in the rising process, the collision probability with the oil drops is increased, and the capturing of the oil drops is completed in a shorter time.
And oil drops which are not captured in the first electromagnetic coupling copolymerization flotation area are partially captured by bubbles under the action of a second bubble inflow port to form floating oil, and the floating oil formed in the first electromagnetic coupling copolymerization flotation area together with the floating oil directly enters the second conventional flotation area from the upper end of the baffle, and part of produced water containing the oil drops which are not captured by the bubbles enters the electromagnetic coupling flocculation coalescence area.
The second positive electrode plate 20 in the electromagnetic coupling flocculation coalescence area is provided with a flocculant outlet 16, the included angle between the flocculant outlet and the second positive electrode plate is between 30 and 60 degrees, and the flocculant outlet faces the electromagnetic coupling flocculation coalescence area, so that on one hand, the flocculant provides power for produced water to enable the produced water to downwards move through the electromagnetic coupling flocculation coalescence area, and the electromagnetic coupling flocculation coalescence area plays a role of electromagnetic coupling and flocculation coalescence. On the other hand, only adding flocculant in the electromagnetic coupling flocculation coalescence area performs flocculation reaction on oil drops which are not successfully floated in the first electromagnetic coupling copolymerization flotation area and the first conventional flotation area, so that the dosage of flocculant is greatly saved, and the special disease special treatment of oil drops with high emulsification degree and poor surface hydrophobicity is realized.
As shown in fig. 2, after the produced water containing the non-captured oil droplets and the flocculant enter the electromagnetic coupling flocculation coalescence zone, the electromagnetic Force (FM) applied by the produced water micro-clusters is directed upwards, while the non-conductive oil droplets are applied with opposite Force (FOSM) downwards. This causes the flocculant-carrying produced water micelles to flow with hysteresis after being subjected to an upward force, while the oil droplets are accelerated relative to the produced water micelles by being subjected to a downward force towards the bottom of the electromagnetically coupled flocculation coalescing zone. As shown in fig. 3, in the movement process of the oil drops relative to the micro-clusters of the produced water, on one hand, the collision probability of the oil drops and the flocculating agent in the water is increased. The surface of the oil drop is electrically neutralized, and is simultaneously net-caught by a flocculant long-chain structure to form large flocs, and on the other hand, the probability of mutual collision of the flocs with different sizes is increased to form larger oil drop groups. Because the emulsion degree of partial oil drops in produced water is high, and hydrophilic crown energy groups such as hydroxyl groups are adsorbed to cause poor surface wettability, the surface wettability is difficult to gather and float after collision with each other and oil drops. The electromagnetic coupling and flocculation copolymerization mechanism of the electromagnetic coupling and flocculation coalescence area can reduce the repulsive interaction between the highly emulsified oil drops, and large flocs are formed after collision so as to prepare for subsequent flotation separation.
The electromagnetic coupling flocculation coalescence area is connected with the bottom of the second electromagnetic coupling copolymerization flotation area, after large flocs and oil drop groups enter the second electromagnetic coupling copolymerization flotation area from the bottom of the electromagnetic coupling flocculation coalescence area, as shown in fig. 2, the produced water micro-groups in the second electromagnetic coupling copolymerization flotation area are subjected to downward electromagnetic Force (FM), and bubbles generated by the non-conductive large flocs, oil drop groups and a third bubble inflow port are subjected to upward reaction force, and in the upward movement process, the large flocs and the oil drop groups are captured by the bubbles and successfully adhere to flotation and enter the second conventional flotation area. As shown in fig. 3, in the second electromagnetic coupling copolymerization flotation area, due to the density difference of bubbles with different sizes, large flocs and oil drop groups, the collision probability of the bubbles with the large flocs and the oil drop groups is increased in the process of accelerating and rising after the bubbles are subjected to reaction force, on one hand, the volume of the oil drops is increased after being caught by a flocculating agent, the probability of being caught by the bubbles is increased, and on the other hand, the charge neutralization and charge compensation of the flocculating agent reduce the negative potential of the oil drop surface or Cheng Zhongxing, and the electrostatic repulsion effect is reduced when the oil drops collide with the bubbles, so that the adhesion is easier to occur.
The second electromagnetic coupling copolymerization flotation area is connected with the upper end of the second conventional flotation area, oil drops which are not captured in the first electromagnetic coupling copolymerization flotation area and the first conventional flotation area are subjected to intensified flotation through the second electromagnetic coupling copolymerization flotation area and then enter the second conventional flotation area, large flocs and oil drop groups which are adhered with bubbles are quickly floated on the upper part of the multi-stage air floatation tank main body, and a small part of the oil drops which are not captured can be captured by bubbles generated by a fourth bubble inflow port, float upwards after further flotation, so that pure produced water is discharged from a treated water outlet at the bottom or flows back to the bubble preparation system.
In this embodiment, the third air bubble inflow port should be not lower than the height of the second positive electrode plate in the second electromagnetic coupling copolymerization flotation region. The third bubble inflow port provides bubbles required for flotation on the one hand, and provides power for fluid flowing upwards in the area in the second electromagnetic coupling copolymerization flotation area on the other hand, and the negative pressure area is formed to attract produced water of the electromagnetic coupling flocculation coalescence area to the second electromagnetic coupling copolymerization flotation area and penetrate the second electromagnetic coupling copolymerization flotation area to enter the second conventional flotation area. If the third bubble inflow is too low, a part of bubble flow enters the electromagnetic coupling flocculation coalescence area, and large flocs and oil drop groups in the electromagnetic coupling flocculation coalescence area are prevented from flowing downwards into the second electromagnetic coupling copolymerization flotation area.
In the embodiment, the magnet is attached to the inner wall of the flotation cell and tangent to the edge of the electrode plate, and the N level is outwards. The N-level outward arrangement is used for meeting the technical requirement, so that the produced water receives downward electromagnetic force in an electromagnetic coupling copolymerization flotation area and a second electromagnetic coupling copolymerization flotation area, and oil drops and bubbles are accelerated to rise and collide with each other by upward reaction force. And in the electromagnetic coupling flocculation coalescence area, the produced water receives upward electromagnetic force, oil drops are accelerated to drop by downward reaction force, so that the probability of collision with the flocculant in the produced water is increased to form large flocs and power the large flocs to move to the second electromagnetic coupling copolymerization flotation area.
Example 2:
the embodiment provides an oil removing method based on an electromagnetic coupling copolymerization multistage air floatation oil removing device, which comprises the following specific steps:
after entering the multi-stage floatation tank main body, the produced water enters a first electromagnetic coupling copolymerization floatation area together with bubbles under the action of a first bubble inflow port, and flows upwards in a mixing way; the produced water in the first electromagnetic coupling copolymerization flotation area is subjected to downward electromagnetic force to generate hysteresis, bubbles and oil drops in the produced water are accelerated to move upwards relative to a water body due to non-conduction and no electromagnetic force, and in the upward movement process, the oil drops are captured by the bubbles and successfully adhere to flotation to form floating oil and enter the first conventional flotation area;
in the first conventional flotation area, under the action of a second bubble inflow port, floating oil directly enters the second conventional flotation area from the upper end of the baffle plate, and part of produced water containing oil drops which are not captured by bubbles enters the electromagnetic coupling flocculation coalescence area;
after the produced water and the flocculating agent enter the electromagnetic coupling flocculation coalescence area, the produced water receives upward electromagnetic force, so that the produced water carrying the flocculating agent flows after receiving upward acting force to generate hysteresis; the oil drops are rapidly moved to the bottom of the electromagnetic coupling flocculation coalescence area under the downward acting force, and collide with the flocculating agent in the downward movement process of the oil drops to form large flocs and oil drop groups;
large flocs and oil drop groups enter a second electromagnetic coupling copolymerization flotation area from the bottom of the electromagnetic coupling flocculation coalescence area; after the large flocs and oil drop groups enter the second electromagnetic coupling copolymerization flotation area, the produced water receives downward electromagnetic force in the second electromagnetic coupling copolymerization flotation area; the bubbles, large flocs and oil drop groups generated by the third bubble inflow port move upwards because of non-conduction and no electromagnetic force, and in the upward movement process, the large flocs and oil drop groups are captured by the bubbles and successfully adhere to flotation and enter a second conventional flotation area;
in the second conventional flotation area, large flocs and oil drop groups adhered with bubbles quickly float up to the upper part of the multi-stage floatation tank main body, and few oil drops which are not captured can be captured by bubbles generated by the fourth bubble inflow port and float up to the upper part of the multi-stage floatation tank main body; pure produced water is discharged from a treated water outlet at the bottom or returned to the bubble preparation system.
The above description is only a preferred embodiment of the present embodiment, and is not intended to limit the present embodiment, and various modifications and variations can be made to the present embodiment by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present embodiment should be included in the protection scope of the present embodiment.
Claims (10)
1. An electromagnetic coupling copolymerization multistage air floatation degreasing device is characterized by comprising: the device comprises a multi-stage air floatation tank main body, a bubble preparation system, an electromagnetic copolymerization system and a multi-stage floatation system; the air bubble preparation system is arranged outside the multi-stage air flotation tank main body, and the electromagnetic copolymerization system and the multi-stage flotation system are arranged inside the multi-stage air flotation tank main body;
the bottom of the multistage air floatation tank main body is provided with a treated water outlet and a plurality of bubble inflow inlets, and the bubble preparation system comprises a booster pump and a bubble generator; the treated water outlet is sequentially connected with a booster pump and a bubble generator, and the outlet pipeline of the bubble generator is respectively connected with a plurality of bubble inflow inlets; the electromagnetic copolymerization system comprises a plurality of positive electrode plates and a plurality of magnets, wherein the magnets are arranged between the positive electrode plates and the negative electrode plates, and the multistage flotation system is formed in the multistage air flotation tank main body; the multistage flotation system comprises five flotation areas which are connected in series, wherein each flotation area comprises a first electromagnetic coupling copolymerization flotation area, a first conventional flotation area, an electromagnetic coupling flocculation coalescence area, a second electromagnetic coupling copolymerization flotation area and a second conventional flotation area which are connected in series in sequence, a baffle is arranged at the upper end between the electromagnetic coupling flocculation coalescence area and the second electromagnetic coupling copolymerization flotation area, and a gap is reserved between the top end of the baffle and the top of the multistage floatation tank main body; and a flocculant outlet is arranged on the positive electrode plate in the electromagnetic coupling flocculation coalescence region, and faces the electromagnetic coupling flocculation coalescence region.
2. The electromagnetic coupling copolymerization multistage air floatation degreasing device according to claim 1, wherein a part of treated water is directly discharged outside through a treated water outlet, the other part of treated water is added through a booster pump, then enters a bubble generator to generate bubbles, and the bubbles are discharged from an outlet pipeline of the bubble generator and enter a multistage air floatation tank body through a bubble inflow port.
3. The electromagnetic coupling and copolymerization multistage air flotation degreasing device according to claim 1, wherein a produced water inlet is formed in the bottom of the multistage air flotation tank body near the first electromagnetic coupling and copolymerization flotation region, and the air bubble inflow port comprises a first air bubble inflow port arranged below the first electromagnetic coupling and copolymerization flotation region, a second air bubble inflow port arranged below the first conventional flotation region, a third air bubble inflow port arranged below the second electromagnetic coupling and copolymerization flotation region and a fourth air bubble inflow port arranged in the second conventional flotation region; the produced water and bubbles are mixed and flow upwards in the first electromagnetic coupling copolymerization flotation area under the action of the first bubble inflow port.
4. An electromagnetic coupling copolymerization multistage air floatation degreasing device as claimed in claim 3, wherein the produced water is subjected to downward electromagnetic force, bubbles and oil drops in the produced water move upwards due to non-conduction and no electromagnetic force, and the oil drops are captured by the bubbles during the upward movement and successfully adhere to floatation to form floating oil and enter the first conventional floatation area.
5. The electromagnetic coupling copolymerization multistage air floatation degreasing device according to claim 4, wherein under the action of the second bubble inflow port, after the flotation separation in the first conventional floatation region, the floating oil directly enters the second conventional floatation region from the upper end of the baffle plate, and part of produced water containing oil drops which are not captured by bubbles enters the electromagnetic coupling flocculation coalescence region.
6. The electromagnetic coupling copolymerization multistage air floatation degreasing device according to claim 1, wherein after the produced water and the flocculating agent enter the electromagnetic coupling flocculation coalescence area, the produced water is subjected to upward electromagnetic force, so that hysteresis occurs in the flow of the produced water carrying the flocculating agent after the produced water is subjected to upward acting force; the oil drops are rapidly moved to the bottom of the electromagnetic coupling flocculation coalescence area under the downward acting force, and collide with the flocculating agent in the downward movement process of the oil drops to form large flocs and oil drop groups.
7. The electromagnetic coupling copolymerization multistage air floatation degreasing device according to claim 6, wherein the large floc and oil drop groups enter the second electromagnetic coupling copolymerization floatation region from the bottom of the electromagnetic coupling flocculation coalescence region; after the large flocs and oil drop groups enter the second electromagnetic coupling copolymerization flotation area, the produced water receives downward electromagnetic force in the second electromagnetic coupling copolymerization flotation area; the bubbles, large flocs and oil drop groups generated by the third bubble inflow port move upwards due to non-conduction and no electromagnetic force, and in the upward movement process, the large flocs and oil drop groups are captured by the bubbles and successfully adhere to flotation and enter a second conventional flotation region.
8. The electromagnetic coupling copolymerization multistage air floatation degreasing device according to claim 7, wherein in the second conventional floatation region, large flocs and oil drop groups adhered with bubbles quickly float up to the upper part of the multistage air floatation tank body, and a small part of the oil drops which are not captured can be captured by bubbles generated by a fourth bubble inflow port and float up to the upper part of the multistage air floatation tank body; pure produced water is discharged from a treated water outlet at the bottom or returned to the bubble preparation system.
9. The electromagnetic coupling copolymerization multistage air floatation degreasing device according to claim 1, wherein the positive electrode plate and the negative electrode plate are parallel and equal in size, the magnet is attached to the inner wall of the multistage air floatation tank body and tangent to the edges of the positive electrode plate and the negative electrode plate, and the N stages are outwards.
10. A degreasing method based on an electromagnetic coupling copolymerization multistage air-float degreasing device as claimed in any one of claims 1 to 9, comprising the following steps:
after entering a multi-stage floatation tank main body, the produced water enters a first electromagnetic coupling copolymerization floatation area together with bubbles, oil drops in the produced water in the first electromagnetic coupling copolymerization floatation area are captured by the bubbles and successfully adhere to floatation to form floating oil and enter a first conventional floatation area, the floating oil directly enters a second conventional floatation area from the upper end of a baffle, and part of the produced water containing the oil drops which are not captured by the bubbles enters an electromagnetic coupling flocculation coalescence area;
in the electromagnetic coupling flocculation coalescence area, oil drops collide with a flocculating agent to form large flocs and oil drop groups;
large flocs and oil drop groups enter a second electromagnetic coupling copolymerization flotation area from the bottom of the electromagnetic coupling flocculation coalescence area; large flocs and oil drop groups are captured by bubbles and successfully adhere to flotation and enter a second conventional flotation area, and finally float to the upper part of the multi-stage air floatation tank main body;
in the second conventional flotation region, a very small portion of the non-captured oil droplets are captured by the air bubbles and float up to the upper portion of the multi-stage flotation tank body; pure produced water is discharged from a treated water outlet at the bottom or returned to the bubble preparation system.
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