CN108585095B - Loading circulation lamination flotation separation device and enhanced oil-water separation method - Google Patents

Loading circulation lamination flotation separation device and enhanced oil-water separation method Download PDF

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Publication number
CN108585095B
CN108585095B CN201810486485.8A CN201810486485A CN108585095B CN 108585095 B CN108585095 B CN 108585095B CN 201810486485 A CN201810486485 A CN 201810486485A CN 108585095 B CN108585095 B CN 108585095B
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China
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flotation
oil
separation
cylinder
gas
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CN108585095A (en
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于忠臣
王松
林红岩
张亢
孙伟楠
朱根旺
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Daqing Luolang Technology Co ltd
Northeast Petroleum University
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Daqing Luolang Technology Co ltd
Northeast Petroleum University
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/24Treatment of water, waste water, or sewage by flotation
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00Multistage treatment of water, waste water, or sewage
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/28Treatment of water, waste water, or sewage by sorption
    • C02F1/285Treatment of water, waste water, or sewage by sorption using synthetic organic sorbents
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/40Devices for separating or removing fatty or oily substances or similar floating material
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/52Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/10Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00Apparatus for treatment of water, waste water or sewage
    • C02F2201/002Construction details of the apparatus
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00General aspects of water treatment
    • C02F2301/08Multistage treatments, e.g. repetition of the same process step under different conditions
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00Specific treatment goals
    • C02F2303/14Maintenance of water treatment installations

Abstract

The invention discloses a loading circulating laminated flotation separation device and an enhanced oil-water separation method; specifically, in the loading circulating laminated flotation separation device, a lower loading internal circulating flotation area and an upper advection flotation area which are overlapped and connected in series in space are constructed, and hydraulic connection and the exchange of oil, gas and water in sewage are established between the two flotation areas through the action of gas migration and conveying; in the loading internal circulation flotation zone, liquid circulation which alternately flows through the upflow zone and the downflow zone is constructed by utilizing the gas stripping principle, and the liquid circulation provides more adhesion opportunities for the bubbles and the oil particles; the more adhesion opportunities improve the efficiency and the degree of separation of oil and water; and in the advection flotation area, carrying out secondary flotation on the sewage passing through the loading internal circulation flotation area. Effectively improves the oil-water separation efficiency and solves the problem of low adhesion efficiency of the traditional air floatation bubbles.

Description

Loading circulation lamination flotation separation device and enhanced oil-water separation method
Technical Field
The invention relates to an oily sewage treatment device and a treatment method, in particular to the treatment of oilfield ASP flooding sewage.
Background
The main oil fields in China enter the middle and later stages of effective development in succession, the water content of produced liquid is greatly improved, and the oil field yield is gradually reduced and accelerated. In order to effectively use underground recoverable reserves and prolong the economic development period of an oil field, the ternary combination flooding oil extraction technology is gradually mature after years of scientific research, customs and mine field tests, and effectively achieves the purposes of improving the recovery ratio and increasing the yield of crude oil, thereby becoming a technical guarantee for stable yield of the oil field.
The ternary combination flooding produced liquid has the advantages of reduced oil-water interfacial tension and increased oil-water interfacial energy, so that the oil particle dispersion degree is improved, the oil-water emulsification degree and the stability are enhanced, and the traditional flotation oil-water separation efficiency is greatly reduced. The impact on the subsequent quartz sand filtration load is large, even the filter material pollution is caused, the treated ternary combination flooding sewage is difficult to reach the standard, and the quality of oilfield reinjection water is greatly influenced.
In order to improve the oil-water separation efficiency of the traditional flotation technology, a method for increasing the hydraulic retention time is adopted in engineering to strengthen the oil-water separation process. The ternary system oil particles are dispersed finely, and the adhesion of bubbles and oil particles is poor, so that the oil-water separation effect is not obviously improved. Therefore, the search for a high-efficiency oil-water separation device and a method for enhancing oil-water separation, which can adapt to the ASP flooding sewage, becomes an urgent problem to be solved in production, and becomes a development trend and an effort direction in the future.
Disclosure of Invention
In view of the above, the invention provides a loading circulation lamination flotation separation device and an enhanced oil-water separation method, which provide a new technology for the effective treatment of the ternary combination flooding sewage of the oil field and solve the problem of poor oil-water separation effect of the ternary combination flooding sewage by using the traditional flotation technology.
In a first aspect, a loading circulation lamination flotation separation device is provided, which is used for treating oilfield ASP flooding sewage and is characterized by comprising:
a barrel;
the interior of the cylinder body is provided with a loading internal circulation flotation component and an advection flotation component;
the loading internal circulation flotation component comprises a separation component and an aeration component;
the separation component separates an upflow zone and a downflow zone in the cylinder;
the aeration component is used for inputting gas into the upflow region;
the gas is dissolved and/or dispersed in the sewage to form gas-containing liquid;
the gas content of the gas-containing liquid in the up-flow zone is greater than the gas content of the gas-containing liquid in the down-flow zone;
the sewage is pushed to establish liquid flow circulation between the ascending flow area and the descending flow area due to the difference of the gas content;
the liquid flow circulates to create the opportunity for oil particles in the sewage and air bubbles in the gas-containing liquid to adhere to each other, so that the success rate of adhesion and the efficiency of adhesion are improved;
the horizontal flow flotation component and the loading internal circulation flotation component establish hydraulic connection, and are used for separating, exchanging and/or transferring oil, water and gas, and carrying out secondary flotation on the sewage.
Preferably, the cylinder body is a cylinder with a sealing head at the bottom and an opening at the upper end;
the cylinder body is provided with an oil discharge channel and a water discharge channel.
Preferably, the partition assembly includes:
inner cylinder
The inner cylinder is a cylinder with two open ends.
Preferably, the aeration member employs a membrane air diffuser.
Preferably, the advection flotation member comprises:
the device comprises an inverted cone, a guide cylinder and a separating cylinder;
the separating cylinder is fixed above the inside of the cylinder body, and the wall of the separating cylinder is provided with a plurality of holes;
the upper end of the inverted cone is connected with the lower end of the separating cylinder, and the lower end of the inverted cone is inserted into the upper port of the inner cylinder;
the guide cylinder is fixed in the separation cylinder;
the guide cylinder is internally provided with an inclined plate separator;
the sewage enters an annular space between the guide shell and the separating shell from the strip-shaped holes;
most of oil in the sewage floats upwards and enters the oil discharge channel to be discharged, part of residual oil and all water in the sewage are further separated by the inclined plate separator and then discharged from the water discharge channel, and part of residual oil and all water enter the inner cylinder to participate in the liquid flow circulation.
Preferably, the loaded circulating laminated flotation separation device further comprises:
a mud-water separating member;
the mud-water separation component is arranged below the loading internal circulation flotation component and is used for collecting and cleaning sludge in the sewage.
Preferably, the mud-water separating member includes:
a mud-water separation sloping plate;
the mud-water separation sloping plate is arranged below the inner cylinder;
the sludge in the sewage slides downwards along the sludge-water separation sloping plate by means of gravity;
the mud-water separation inclined plate is used for separating the sludge from the water.
Preferably, the mud-water separating member further includes:
the mud scraping assembly and the mud storage structure;
the mud scraping assembly is provided with a plurality of scraping plates;
the scraper is used for scraping the sludge at the bottom of the cylinder;
the mud storage structure; used for storing the sludge scraped by the scraper.
Preferably, the mud scraping assembly is a mud scraping grid;
the mud scraping grid is connected with the motor;
the motor drives the mud scraping grid to rotate;
the scraper on the mud scraping grid is in contact with the bottom of the cylinder body to scrape the sludge deposited at the bottom of the cylinder body.
Preferably, the mud storage structure comprises:
a plurality of mud storage bags;
the sludge storage bag is communicated with the bottom of the cylinder body and is used for collecting the sludge;
a sludge discharge port is formed at the bottom of the sludge storage bag;
and the sludge discharge port is used for discharging the sludge collected in the sludge storage bag.
In a second aspect, a method for enhancing oil-water separation is provided, which comprises:
any one of the above-described loaded circulating laminated flotation separation devices;
in the loading circulating laminated flotation separation device, a lower loading internal circulating flotation area and an upper advection flotation area which are overlapped and connected in series are constructed in space, and hydraulic connection and the exchange of oil, gas and water in sewage are established between the two flotation areas through the gas migration and conveying action; in the loading internal circulation flotation zone, liquid circulation which alternately flows through the upflow zone and the downflow zone is constructed by utilizing the gas stripping principle, and the liquid circulation provides more adhesion opportunities for the bubbles and the oil particles; the more adhesion opportunities improve the efficiency and the degree of separation of oil and water; and in the advection flotation area, carrying out secondary flotation on the sewage passing through the loading internal circulation flotation area.
Preferably, lipophilic reticulated polyurethane foam particles are also added into the loading circulating laminated flotation separation device; the polyurethane foam particles participate in the liquid flow circulation, the oil particles dispersed in the sewage are contacted with the polyurethane foam particles, and under the action of the lipophilic surface adsorption force of the polyurethane foam particles, the oil particles are adhered to the surfaces of the polyurethane foam particles until the oil particles are aggregated and become large-volume oil drops; under the action of the shearing action of the liquid flow circulation, the oil drops are peeled off from the surface of the polyurethane foam particles and float up to an advection flotation area under the action of buoyancy; the polyurethane foam particles repeat the adhering, the coalescing, and the exfoliating with the oil particles in the sewage for improving the oil-water separation efficiency.
Preferably, in the loading internal circulation flotation zone, a liquid flow circulation which alternately flows through the upflow zone and the downflow zone is constructed by utilizing a gas stripping principle, and the liquid flow circulation provides more adhesion opportunities for the bubbles and the oil particles; the method specifically comprises the following steps: the sewage enters the upflow zone to participate in the liquid flow circulation, oil particles dispersed in the sewage are directly contacted with bubbles generated by gas introduced into the upflow zone, the oil particles are adhered and/or desorbed with the bubbles, the oil particles are desorbed with the bubbles, and the oil particles enter the downflow zone under the action of the liquid flow circulation and return to the upflow zone for adhesion again; the oil particles and the bubbles are successfully adhered to form a gas-particle complex; the gas-particle complex floats upwards under the action of buoyancy and enters the advection flotation area where the advection flotation component is located.
Preferably, in the secondary flotation, in the advection flotation zone, the gas-particle complex is subjected to gas and oil particle separation by the advection flotation component, the gas is released through the liquid surface after being separated, and the oil particles float to the liquid surface to form an oil layer and are discharged through an oil discharge channel.
Preferably, in the loading circulation lamination flotation separation device, the loading circulation lamination flotation separation device further comprises a sludge cleaning area, sludge in the sewage enters the sludge cleaning area through the sludge-water separation inclined plate under the action of gravity, and the sludge is removed by the sludge-water separation member and enters the sludge storage structure and then is discharged through the sludge discharge port.
The invention has the beneficial effects that:
1. two-stage flotation series of spatial stacking is constructed, and interstage material exchange and hydraulic connection are realized through gas migration and conveying effects. Meanwhile, the spatial superposition layout realizes the purpose of sequentially driving two-stage flotation by inputting gas once, and effectively improves the gas utilization efficiency and the oil-water separation efficiency;
2. the internal circulation flotation area consists of an upflow area and a downflow area, and sewage in the upflow area is in a turbulent flow state to form a gas-liquid contact area, so that the gas-liquid contact probability is improved; the gas content of the downdraft zone is low and is in a laminar flow state, so that a separation zone is formed. The inner circulation liquid flows alternately flow through the rising area and the falling area, so that the adhesion of multiple batches of bubbles and oil particles and the sequential separation of a 'gas-particle' complex are realized, and the space-time multiple continuous flotation gradient separation efficiency is obtained;
3. the gas is dispersed into micro-bubbles by the membrane diffuser and is input into the upflow zone, and internal circulation flow which flows through the upflow zone and the downflow zone alternately in space is established, so that an internal circulation flotation zone is constructed. The multi-time adhesion of oil particles and bubbles is realized in the inner circulation flotation zone, and the problem of low adhesion efficiency of the traditional air floatation bubbles is solved;
4. lipophilic netted polyurethane foam particles are added into the internal circulation flotation area, and dispersed oil particles generate coalescence effect on the surfaces of the foam particles and have the effect of loading flotation separation. Meanwhile, the foam particles forcibly perform controlled internal circulation flow under the action of liquid flow circulation, the oil particles and the foam particles are continuously subjected to state relation change of adhesion, coalescence and peeling, and dispersed oil particles are forcedly and continuously separated out like artificial oil absorption balls, so that the oil-water separation efficiency is effectively improved;
5. the sewage carries the micro-fine sludge components to enter the sludge-water inclined plate separation area to realize the separation of the micro-fine sludge and water, and the micro-fine sludge and the water are combined with the internal circulation flotation unit, the advection flotation unit and the sludge storage unit to form an integrated oil-water separation system to realize the synchronous separation of oil, water and sludge.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:
fig. 1 is a schematic structural view of a loading circulation laminated flotation separation device of an embodiment of the invention.
Detailed Description
The present invention will be described below based on examples, but it should be noted that the present invention is not limited to these examples. In the following detailed description of the present invention, certain specific details are set forth. However, the present invention may be fully understood by those skilled in the art for those parts not described in detail.
Furthermore, those skilled in the art will appreciate that the drawings are provided solely for the purposes of illustrating the invention, features and advantages thereof, and are not necessarily drawn to scale.
Also, unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, the meaning of "includes but is not limited to".
Fig. 1 is a schematic structural view of a loading circulation laminated flotation separation device of an embodiment of the invention. As shown in fig. 1: a loading circulation lamination flotation separation device is used for treating ternary combination flooding sewage of an oil field and specifically comprises a cylinder body 1, wherein the cylinder body 1 is a cylinder with a seal head at the bottom and an opening at the upper end. The lower part of the cylinder 1 is provided with a water inlet pipe 18, the upper part of the cylinder 1 is provided with an oil discharge pipe 14 and a water discharge pipe 15, and the inside of the cylinder 1 is provided with an advection flotation component, a loading internal circulation flotation component and a mud-water separation component from top to bottom in sequence.
Further, as shown in fig. 1: the loading internal circulation flotation component comprises an inner cylinder 3 and an aeration component; the inner cylinder 3 is a cylinder with two open ends, and the inner cylinder 3 is fixed in the cylinder body 1 through a third rib plate 16; the aeration member adopts a membrane air diffuser 2, and the membrane air diffuser 2 is communicated with an annular aeration pipe 17.
According to the flow moving direction, the space of the area surrounded by the inner cylinder 3 and the cylinder 1 forms a loading inner circulation flotation up-flow area I, and the space inside the inner cylinder forms a loading inner circulation flotation down-flow area II; gas is input into the upflow zone I through the membrane air diffuser 2 and the annular aeration pipe 17, and the input gas is dissolved and/or dispersed in the sewage to form gas-containing liquid.
As is well known, the gas content of the gas-containing liquid in the upflow zone I is greater than that of the gas-containing liquid in the downflow zone II, and the gas content is different, so that the densities of the gas-containing liquid in the upflow zone I and the downflow zone II are different, and the density difference provides power for establishing liquid circulation between the upflow zone I and the downflow zone II; and the liquid flow circulation provides multiple opportunities for oil particles in the wastewater to adhere to the bubbles in the gas-containing liquid.
Further, as shown in fig. 1: the advection flotation component comprises an inverted cone 6, a guide cylinder 7 and a separation cylinder 8; the separating cylinder 8 is fixed in the cylinder body 1 through a first rib plate 13, and a plurality of strip-shaped holes are formed in the wall of the separating cylinder 8 along the circumferential direction; the upper end of the inverted cone 6 is connected with the lower end of the separating cylinder 8, the lower end of the inverted cone 6 is inserted into the upper port of the inner cylinder 3, and the lower end of the inverted cone 6 is provided with a perforated bottom plate 4; the guide shell 7 is fixed in the separation shell 8 through a second rib plate 12, an annular oil collecting weir 9 is arranged on the outer wall of the guide shell 7, and the annular oil collecting weir 9 is communicated with an oil discharge pipe 14; an annular water collecting weir 11 is arranged on the inner wall of the guide shell 7, and the annular water collecting weir 11 is communicated with a drain pipe 15; the guide shell 7 also has a swash plate separator 10 therein.
Further, in fig. 1, the region where the advection flotation member is located is an advection flotation region, in the advection flotation region, the region space surrounded by the cylinder 1 and the separation cylinder 8 forms an advection flotation contact region iii, and the region space surrounded by the separation cylinder 8 and the guide cylinder 7 forms an advection flotation separation region iv. And a parallel inclined plate inclined at 45-60 degrees is arranged in the inner space of the guide cylinder 7 to form an air-water inclined plate separation area V.
The sewage enters an advection flotation region, and because the gas input by the membrane air diffuser 2 is further diffused to an advection flotation contact region III from an upflow region I, the sewage is pushed to enter an advection flotation separation region IV from a strip-shaped hole under the action of the gas flow; most of the oil in the sewage floats upwards to form an oil layer with a certain thickness, and the oil layer is discharged out of the cylinder body 1 through the annular oil collecting weir 9 and the oil discharge pipe 14 after reaching the annular oil collecting weir 9; the residual oil and all water in the sewage partially enter the inner cylinder 3 to participate in liquid flow circulation, partially flow into a gas-water inclined plate separation area V, gas separated by an inclined plate separator 10 in the gas-water inclined plate separation area V is discharged from the upper end of the cylinder, and the separated water is discharged out of the cylinder 1 through an annular water collecting weir 11 and a water discharge pipe 15.
It can be seen that sewage enters the advection flotation zone, hydraulic connection is established between the advection flotation component and the loading internal circulation flotation component, and water, oil and gas are further exchanged and/or transferred under the action of the advection flotation component, so that secondary flotation is carried out on the sewage.
Further, in fig. 1, a sludge-water separating member, which is disposed below the internal circulation flotation member, functions to collect sludge in the sewage.
In fig. 1, the mud-water separation member comprises an upper sealing cone 19, the upper sealing cone 19 is fixed below the cylinder 1 through a fourth rib plate 32, and the side wall of the upper sealing cone is formed into a mud-water separation inclined plate; the upper sealing conical cylinder 19 is arranged right below the inner cylinder 3, and the space in the area between the lower part of the upper sealing conical cylinder 19 and the end enclosure 20 forms a sludge treatment area VI; and the sludge in the sewage slides downwards along the sludge-water separation inclined plate by means of gravity to separate the sludge and water, and the separated sludge enters a sludge treatment area VI.
The upper sealing cone cylinder 19 can also be replaced by a plurality of parallel mud-water separation sloping plates, the inclination angle of the mud-water separation sloping plates is 45-60 degrees, every two mud-water separation sloping plates form a precipitation separation micro unit, sewage flows upwards between the mud-water separation sloping plates, sludge slides downwards along the upper surfaces of the mud-water separation sloping plates under the action of gravity, and mud and water separation is realized due to the speed difference existing between the water phase and the solid phase between the mud-water separation sloping plates.
Further, the mud-water separation member also comprises a mud scraping assembly and a mud storage structure; the mud scraping component is provided with a plurality of scraping plates; the scraper is used for scraping sludge at the bottom of the seal head; the sludge storage structure is used for storing sludge scraped by the scraper.
Further, in fig. 1, the mud scraping assembly is a mud scraping grid 21; the mud scraping grid 21 is connected with a speed reducing motor 27; the speed reducing motor 27 drives the mud scraping grid 21 to rotate; the scrapers on the mud scraping grid 21 contact with the bottom of the seal head 20 to scrape off the sludge deposited on the bottom of the seal head 20.
Further, in fig. 1, the speed reducing motor 27 is connected with the mud scraping fence 21 through a coupling 26 and a shaft 29, the shaft 29 is externally provided with a nylon bearing 24, and the nylon bearing 24 is externally provided with a bearing cover plate 25 and a support 28 and fixed at the lower part of the cylinder 1.
Further, in fig. 1, in order to mount the reduction motor 27 and the supporting mechanism, a skirt 31 is welded to the lower end of the cylinder 1, and the skirt 31 is supported by a base 30.
Further, in fig. 1, the mud storage structure comprises a plurality of mud storage bags 22; the sludge storage bag 22 is communicated with the bottom of the end enclosure 20; the bottom of the mud storage bag 22 is provided with a mud discharging port 23.
Specifically, the method for performing enhanced oil-water separation by using the loading circulation laminated flotation separation device of the invention is described with reference to fig. 1:
the loading circulation lamination flotation separation device is divided into a loading inner circulation flotation area, an advection flotation area, a gas-water inclined plate separation area and a sludge storage area according to different functions.
When the device works, sewage enters the inner cavity of the cylinder 1 from the water inlet pipe 18, the membrane diffuser 2 is opened to convey gas into the cylinder 1, the gas is dispersed into micro bubbles through the membrane diffuser 2 and is input into the upflow zone I, the gas is dissolved or dispersed in liquid in the upflow zone I to form gas-containing liquid, so that the density of the gas-containing liquid in the upflow zone I and the density of the gas-containing liquid in the downflow zone II are different, internal circulation flow which alternately flows through the upflow zone and the downflow zone is established, and a loading internal circulation flotation zone is constructed.
In the loading internal circulation flotation zone, the upflow zone I is in a turbulent flow state to form a gas-liquid contact zone; and the downwash zone II is in a laminar flow state to form a separation zone. When the internal circulation liquid flow flows through the upflow zone I, the dispersed oil particles in the water are directly contacted with the micro bubbles, the oil particles and the bubbles repeatedly carry out adhesion and desorption, if the oil particles and the bubbles are successfully adhered, a compact gas-particle complex is formed, and the compact gas-particle complex floats to an upper-stage flotation zone (advection flotation zone) under the action of buoyancy; if the oil particles are not successfully adhered to the bubbles, the oil particles enter the descending flow area II under the entrainment effect of the internal circulation liquid flow, and then return to the ascending flow area I again to be adhered to the bubbles again. The internal circulation liquid flows alternately through the flow rising area and the flow falling area in such a reciprocating way, so that the multiple adhesion of oil particles and bubbles is realized, and the problem of low adhesion efficiency of the traditional air floatation bubbles is solved.
In addition, lipophilic reticulated polyurethane foam particles are added into the loading internal circulation flotation area, the polyurethane foam particles are forced to participate in liquid flow circulation under the entrainment effect of the internal circulation liquid flow, oil particles dispersed in sewage are directly contacted with the reticulated polyurethane foam particles, and the oil particles are continuously adhered to the surfaces of the polyurethane foam particles under the action of lipophilic surface adsorption force of the polyurethane foam particles. Meanwhile, under the action of the surface adsorption force of the polyurethane foam particles, the adhered dispersed small oil particles gradually coalesce into large-volume oil drops. Under the shearing action of the internal circulation liquid flow, the oil drops with large volume are peeled off from the surface of the polyurethane foam particles and float up to an upper-stage flotation area (advection flotation area) under the action of buoyancy; the process of adhesion, coalescence and stripping of oil particles is continuously carried out on the surfaces of the oleophylic reticular polyurethane foam particles in such a reciprocating way, and dispersed oil particles are forcedly and continuously separated out like artificial oil absorption balls, so that the oil-water separation efficiency is effectively improved.
In the advection flotation zone, the floating gas-particle complex and oil drops are mixed with sewage and sequentially flow through an advection flotation contact zone III, an advection flotation separation zone IV and a gas-water inclined plate separation zone V, the gas-particle complex is subjected to gas and oil particle separation through an advection flotation component, the separated gas is released through the liquid level, and the separated oil particles and oil drops float to the liquid level to form an oil layer and are discharged out of the cylinder body 1 through an oil discharge pipe 14; and the separated water is discharged out of the tub 1 through the drain pipe 15.
The ternary composite flooding sewage which enters through the water inlet pipe 18 is settled into the sludge treatment area VI after the silt substances which are heavier than water are separated by the mud-water separation sloping plate, in the sludge treatment area VI, the started sludge scraping grid 21 rotates at the bottom of the barrel 1, the scraper on the sludge scraping grid 21 is scraped with the bottom of the seal head 20, the sludge settled at the bottom of the seal head is pushed into the sludge storage bag 22 for storage, the sludge in the sludge storage bag 22 is accumulated to a certain degree, and the sludge is discharged from the sludge discharge port 23.
The above-mentioned embodiments are merely embodiments for expressing the invention, and the description is specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, various changes, substitutions of equivalents, improvements and the like can be made without departing from the spirit of the invention, and these are all within the scope of the invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (6)

1. A loading circulation lamination flotation separation device is used for treating oilfield ASP flooding sewage and is characterized by comprising:
a barrel;
the interior of the cylinder body is provided with a loading internal circulation flotation component and an advection flotation component;
the loading internal circulation flotation component comprises a separation component and an aeration component;
the separation component separates an upflow zone and a downflow zone in the cylinder;
the aeration component is used for inputting gas into the upflow region;
the gas is dissolved and/or dispersed in the sewage to form gas-containing liquid;
the gas content of the gas-containing liquid in the up-flow zone is greater than the gas content of the gas-containing liquid in the down-flow zone;
the sewage is pushed to establish liquid flow circulation between the ascending flow area and the descending flow area due to the difference of the gas content;
the liquid flow circulates to create the opportunity for oil particles in the sewage and air bubbles in the gas-containing liquid to adhere to each other, so that the success rate of adhesion and the efficiency of adhesion are improved;
the advection flotation component and the loading internal circulation flotation component establish hydraulic connection for separating, exchanging and/or transferring oil, water and gas, and carry out secondary flotation on the sewage;
the cylinder body (1) is a cylinder with a sealing head at the bottom and an opening at the upper end;
the cylinder body (1) is provided with an oil discharge channel and a water discharge channel;
the separation component is an inner cylinder (3);
the inner cylinder (3) is a cylinder with two open ends;
the advection flotation member comprising:
the device comprises an inverted cone, a guide cylinder and a separating cylinder;
the separating cylinder is fixed above the inside of the cylinder body, and the wall of the separating cylinder is provided with a plurality of holes;
the upper end of the inverted cone is connected with the lower end of the separating cylinder, and the lower end of the inverted cone is inserted into the upper port of the inner cylinder;
the guide cylinder is fixed in the separation cylinder;
the guide cylinder is internally provided with an inclined plate separator;
the sewage enters an annular space between the guide shell and the separating shell from the strip-shaped holes;
most of oil in the sewage floats upwards and enters the oil discharge channel to be discharged, and part of residual oil and all water in the sewage is further separated by the inclined plate separator and then discharged from the water discharge channel, and part of residual oil and all water enters the inner cylinder to participate in the liquid flow circulation;
the area where the advection flotation component is located is an advection flotation area, in the advection flotation area, the space of the area surrounded by the cylinder body and the separating cylinder forms an advection flotation contact area III, the space of the area surrounded by the separating cylinder and the guide cylinder forms an advection flotation separation area IV, and the space in the guide cylinder is provided with a parallel inclined plate inclined at 45-60 degrees to form an air-water inclined plate separation area V.
2. The loaded circulating laminated flotation separation device of claim 1, further comprising:
a mud-water separating member;
the mud-water separation component is arranged below the loading internal circulation flotation component and is used for collecting and cleaning sludge in the sewage.
3. The loaded loop laminated flotation separation device of claim 2, wherein the mud-water separation member further comprises:
a mud-water separation sloping plate;
the mud-water separation sloping plate is arranged below the inner cylinder;
the sludge in the sewage slides downwards along the sludge-water separation sloping plate by means of gravity;
the mud-water separation inclined plate is used for separating the sludge from the water.
4. An enhanced oil-water separation method is characterized by comprising the following steps:
a loaded circulating tandem flotation separation apparatus as claimed in any one of claims 1 to 3;
in the loading circulating laminated flotation separation device, a lower loading internal circulating flotation area and an upper advection flotation area which are overlapped and connected in series are constructed in space, and hydraulic connection and the exchange of oil, gas and water in sewage are established between the two flotation areas through the gas migration and conveying action; in the loading internal circulation flotation zone, liquid circulation which alternately flows through the upflow zone and the downflow zone is constructed by utilizing the gas stripping principle, and the liquid circulation provides more adhesion opportunities for the bubbles and the oil particles; the more adhesion opportunities improve the efficiency and the degree of separation of oil and water; and in the advection flotation area, carrying out secondary flotation on the sewage passing through the loading internal circulation flotation area.
5. The method of enhancing oil-water separation as defined in claim 4, wherein:
lipophilic reticulated polyurethane foam particles are also added into the loading circulating laminated flotation separation device; the polyurethane foam particles participate in the liquid flow circulation, the oil particles dispersed in the sewage are contacted with the polyurethane foam particles, and under the action of the lipophilic surface adsorption force of the polyurethane foam particles, the oil particles are adhered to the surfaces of the polyurethane foam particles until the oil particles are aggregated and become large-volume oil drops; under the action of the shearing action of the liquid flow circulation, the oil drops are peeled off from the surface of the polyurethane foam particles and float up to an advection flotation area under the action of buoyancy; the polyurethane foam particles repeat the adhering, the coalescing, and the exfoliating with the oil particles in the sewage for improving the oil-water separation efficiency.
6. The enhanced oil-water separation method of claim 5, wherein in the loaded internal circulation flotation zone, a liquid flow circulation which alternately flows through the upflow zone and the downflow zone is constructed by using a gas stripping principle, and the liquid flow circulation provides more adhesion opportunities for the gas bubbles and the oil particles; the method specifically comprises the following steps:
the sewage enters the upflow zone to participate in the liquid flow circulation, oil particles dispersed in the sewage are directly contacted with bubbles generated by gas introduced into the upflow zone, the oil particles are adhered and/or desorbed with the bubbles, the oil particles are desorbed with the bubbles, and the oil particles enter the downflow zone under the action of the liquid flow circulation and return to the upflow zone for adhesion again; the oil particles and the bubbles are successfully adhered to form a gas-particle complex; the gas-particle complex floats upwards under the action of buoyancy and enters the advection flotation area where the advection flotation component is located.
CN201810486485.8A 2018-05-21 2018-05-21 Loading circulation lamination flotation separation device and enhanced oil-water separation method Active CN108585095B (en)

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