CN219259629U - Dissolved air floatation device - Google Patents
Dissolved air floatation device Download PDFInfo
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- CN219259629U CN219259629U CN202320276169.4U CN202320276169U CN219259629U CN 219259629 U CN219259629 U CN 219259629U CN 202320276169 U CN202320276169 U CN 202320276169U CN 219259629 U CN219259629 U CN 219259629U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The utility model relates to the technical field of oilfield produced water treatment, in particular to a dissolved air flotation device which comprises a dissolved air flotation body and a dissolved air reactor arranged in the dissolved air flotation body, wherein the dissolved air flotation body is provided with a water inlet pipe; the dissolved gas reactor comprises a hydrodynamic cavitation dissolved gas reactor body, a water inlet pipe and a dissolved gas water decompression pipe; the water inlet pipe is arranged on the side surface of the hydrodynamic cavitation dissolved air reactor body and penetrates through the side wall of the dissolved air floatation body; the dissolved air water pressure reducing pipe is arranged at the bottom of the hydrodynamic cavitation dissolved air reactor body and penetrates through the dissolved air floatation body; a shell and a gas collecting device positioned above the shell are arranged in the hydrodynamic cavitation gas-dissolving reactor body, and the shell is sequentially divided into a gas-dissolving cavitation reaction section, a gas-dissolving water mixing section and a reflux mixing section from top to bottom; the top of the dissolved air water pressure reducing pipe penetrates through the reflux mixing section and extends into the dissolved air water mixing section, and the air collecting device is communicated with the dissolved air water mixing section through the air return pipe. The utility model can realize physical demulsification without adding demulsifier.
Description
Technical Field
The utility model relates to the technical field of oilfield produced water treatment, in particular to a dissolved air flotation device.
Background
The air-float method is a high-efficiency and quick oil-water separation technology in the treatment of oilfield produced water. The Dissolved Air Flotation (DAF) is a kind of air flotation, it utilizes the characteristic that water solubility is different under different pressures, pressurize all or some water to be treated (or treated) and add air, increase the air dissolution of water, let in the water added with demulsifier, release under the normal pressure, the air separates out and forms the small bubble, adhere to the oil bead, make the oil bead density far smaller than water and rise fast, thus make the oil-water separation.
The common dissolved air flotation device generally uses a dissolved air pump to reflux and pressurize 10% -50% of air flotation water to 0.3-0.8 MPa, and a certain amount of gas (10% -20% of the flow of the dissolved air pump) is dissolved in the pressurizing process. The high-pressure gas-dissolved water in the reflux state is depressurized at the water inlet end to release micro bubbles, and the micro bubbles are contacted with oil droplets in the raw water to form a gas floating body. The dissolved air flotation is generally provided with a mixed contact reaction zone of dissolved air water and raw water at the water inlet end, so that bubbles and oil droplets are fully contacted, and the oil-water separation efficiency is improved. The residence time of the traditional dissolved air flotation contact reaction zone is long (3-5 min), and a demulsifier is needed to be added to improve the oil removal rate, so that small oil droplets are demulsified and coalesced into larger oil droplets, the small oil droplets are easier to combine with bubbles, and the medicament cost is increased. Therefore, it is necessary to design a dissolved air flotation device which can realize demulsification without adding a medicament.
Disclosure of Invention
The utility model aims to overcome the defects in the prior art, and provides a dissolved air flotation device which can realize physical demulsification without adding demulsifiers.
The technical scheme adopted for solving the technical problems is as follows:
a dissolved air flotation device comprises a dissolved air flotation body and a dissolved air reactor arranged in the dissolved air flotation body; the dissolved gas reactor comprises a hydrodynamic cavitation dissolved gas reactor body, a water inlet pipe and a dissolved gas water decompression pipe; the water inlet pipe is arranged on the side surface of the hydrodynamic cavitation dissolved air reactor body and penetrates through the side wall of the dissolved air floatation body; the dissolved air water pressure reducing pipe is arranged at the bottom of the hydrodynamic cavitation dissolved air reactor body and penetrates through the dissolved air floatation body; a shell and a gas collecting device positioned above the shell are arranged in the hydrodynamic cavitation gas-dissolving reactor body, and the shell is sequentially divided into a gas-dissolving cavitation reaction section, a gas-dissolving water mixing section and a reflux mixing section from top to bottom; the top of the dissolved air water pressure reducing pipe penetrates through the reflux mixing section and extends into the dissolved air water mixing section, and the air collecting device is communicated with the dissolved air water mixing section through the air return pipe.
According to the technical scheme, oilfield produced water to be treated flows into the hydrodynamic cavitation gas-dissolving reactor body through the water inlet pipe, high-pressure gas-dissolving water passes through the gas-dissolving water pressure reducing pipe, the pressure drops sharply under the condition of high flow velocity, a large number of micro bubbles are released, the micro bubbles are gradually combined into micro bubbles, then the micro bubbles flow into the gas-dissolving water mixing section, the gas-dissolving water flowing in at high speed forms a negative pressure area in the gas-dissolving water mixing section, raw water and return water are mixed through the return mixing section under the action of negative pressure and then enter the gas-dissolving water mixing section, and the full mixing of the water inlet, the gas-dissolving water and the return water is completed in the gas-dissolving water mixing section; simultaneously, the micro-bubbles expand and collapse under the action of negative pressure to generate cavitation effect, cavitation damages the hydration film on the surface of the oil droplets to demulsify the oil droplets,
the large oil beads are formed, so that the large oil beads are more easily combined with micro bubbles, the physical demulsification is realized, and a chemical demulsifier is not required to be added; raw water, return water and dissolved air water enter a dissolved air cavitation reaction section after being mixed in a dissolved air water mixing section, microbubbles are combined to generate cavitation effect, the cavitation effect is easy to damage a hydration film at the interface of the oil droplets, the oil droplets are promoted to be combined, and the combined large oil droplets are easier to be combined with the microbubbles; the gas collecting device collects large bubbles to form a gas collecting area, and the gas collecting area is sucked and refluxed by utilizing a negative pressure area formed by the gas-dissolved water mixing section through a gas reflux pipe to further participate in reaction, so that secondary gas dissolution is formed, and the gas-dissolved mixing demulsification effect is enhanced.
Further, the gas collecting device comprises a flow guiding gas collecting plate and a gas collecting cover, the top of the flow guiding gas collecting plate is communicated with the gas collecting cover, and the gas collecting cover is communicated with the gas-water mixing section through a gas return pipe. Part of bubbles rise in-process and enter the gas collecting hood through the gas guide collecting plate, and the gas guide collecting plate collects large bubbles and plays a role in rectification at the same time, so that the formation of a large bubble area at the top of a reaction area is prevented, the severe fluctuation of an oil layer is caused, and the reaction effect is influenced.
Further, a gas-dissolved water nozzle is arranged at the top of the gas-dissolved water pressure reducing pipe, and micro bubbles flow into the gas-dissolved water mixing section at a high speed through the gas-dissolved water nozzle.
Furthermore, a rectifying plate is arranged at the joint of the dissolved air water mixing section and the dissolved air cavitation reaction section, and high-speed water flows through the rectifying plate to form refraction so as to strengthen the mixing reaction.
Furthermore, the inner wall of the hydrodynamic cavitation dissolved gas reactor body is provided with a water inlet baffle plate which is positioned at the water outlet of the water inlet pipe.
Furthermore, the water inlet baffle is of an inverted L-shaped structure and is used for changing the flow direction of water inlet so that water flows downwards.
Further, an overflow water distribution weir is arranged at the top of the hydrodynamic cavitation dissolved gas reactor body.
Further, the reflux mixing section forms a reflux mixing zone, the dissolved air water mixing section forms a dissolved air cavitation mixing zone, and the dissolved air cavitation reaction section forms a dissolved air cavitation reaction zone; a rectification reaction area is formed in the area between the gas collecting hood and the overflow water distribution weir; and a reflux area is formed in the reflux mixing section, the dissolved air water mixing section and the area formed between the outside of the dissolved air cavitation reaction section and the inner wall of the hydrodynamic cavitation dissolved air reactor body.
Furthermore, the dissolved air cavitation reaction zone is horn-shaped, the initial flow rate is high, the end flow rate is low,
and a speed gradient is formed, so that the combination of the microbubbles and the oil droplets can be enhanced.
Further, the reflux mixing zone is in the shape of an inverted horn, which can reduce the bottom flow rate and prevent the bottom suspension and particles from being brought to the upper part.
The utility model has the technical effects that:
compared with the prior art, the dissolved air flotation device can realize physical demulsification without adding demulsifier, and reduces the running cost; and collecting overflowed gas, forming negative pressure in the process of refluxing dissolved gas water jet, sucking the overflowed gas to form secondary dissolved gas, strengthening the dissolved gas effect, reducing the reflux quantity and reducing the energy consumption.
Drawings
Fig. 1 is a schematic diagram of the structural principle of the dissolved air flotation device.
In the figure, a water inlet pipe 1, a dissolved air reducing pipe 2, a water inlet baffle 3, a reflux mixing section 4, a dissolved air mixing section 5, a dissolved air cavitation reaction section 6, a hydrodynamic cavitation dissolved air reactor body 7, a dissolved air nozzle 8, a gas reflux pipe 9, a diversion gas collecting plate 10, a gas collecting cover 11, an overflow water distributing weir 12, a dissolved air flotation body 13, a reflux zone 14, a rectifying plate 15, a rectifying reaction zone 16, a reflux mixing section 41, a dissolved air cavitation mixing section 51, a dissolved air cavitation reaction section 61 and a gas collecting pore 101.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present utility model more clear, the technical solutions in the embodiments of the present utility model are clearly and completely described below with reference to the accompanying drawings of the specification.
Example 1:
as shown in fig. 1, the dissolved air flotation device according to the present embodiment includes a dissolved air flotation body 13, a dissolved air reactor, a water inlet pipe 1, a dissolved air water pressure reducing pipe 2, a water inlet baffle 3, a hydrodynamic cavitation dissolved air reactor body 7, a dissolved air water spray head 8, a gas return pipe 9, a diversion gas collecting plate 10, a gas collecting hood 11, an overflow water distribution weir 12 and a rectifying plate 15.
The dissolved air reactor is arranged in the dissolved air floatation body 13; the water inlet pipe 1 is arranged on the side surface of the hydrodynamic cavitation gas-dissolving reactor body 7 and is communicated with the hydrodynamic cavitation gas-dissolving reactor body 7; the dissolved air water decompression pipe 2 is arranged at the bottom of the hydrodynamic cavitation dissolved air reactor body 7 and is communicated with the hydrodynamic cavitation dissolved air reactor body 7. The dissolved air water decompression tube 2 is L-shaped, the vertical part of the dissolved air water decompression tube penetrates through the bottom of the hydrodynamic cavitation dissolved air reactor body 7, and the horizontal part of the dissolved air water decompression tube 2 and the water inlet tube 1 penetrate through the side wall of the dissolved air floatation body 13.
The water inlet baffle 3 is in an inverted L shape, is arranged on the inner wall of the hydrodynamic cavitation dissolved gas reactor body 7, is positioned at the water outlet of the water inlet pipe 1 and is used for changing the flow direction of water inlet so that the water flow flows downwards.
A shell is arranged in the hydrodynamic cavitation gas-dissolving reactor body 7, and the shell is sequentially divided into a gas-dissolving cavitation reaction section 6, a gas-dissolving water mixing section 5 and a reflux mixing section 4 from top to bottom; the reflux mixing section 4 forms a reflux mixing zone 41, the dissolved air water mixing section 5 forms a dissolved air cavitation mixing zone 51, and the dissolved air cavitation reaction section 6 forms a dissolved air cavitation reaction zone 61; the reflux mixing section 4, the dissolved air water mixing section 5 and the dissolved air cavitation reaction section 6 form a reflux zone 14 in the area formed between the outside and the inner wall of the hydrodynamic cavitation dissolved air reactor body 7. Preferably, the dissolved air cavitation reaction zone 61 is in a horn shape, and the reflux mixing zone 41 is in an inverted horn shape.
The reflux mixing section 4 is positioned at the periphery of the dissolved air water decompression tube 2, the dissolved air water spray head 8 is arranged at the top of the dissolved air water decompression tube 2 and is positioned in the dissolved air water mixing section 5; a rectifying plate 15 is arranged above the dissolved air water spray head 8, the rectifying plate 15 is positioned at the joint of the dissolved air water mixing section 5 and the dissolved air cavitation reaction section 6, the rectifying plate 15 adopts a porous plate, and preferably, the open area of the porous plate is 1/2-2/3 of the whole area; a flow guide gas collecting plate 10 is arranged above the dissolved air cavitation reaction section 6, a gas collecting hole 101 is formed in the flow guide gas collecting plate 10, the top of the flow guide gas collecting plate 10 is communicated with a gas collecting cover 11, and the gas collecting cover 11 is communicated with the dissolved air water mixing section 5 through a gas return pipe 9; an overflow water distribution weir 12 is arranged at the top of the hydrodynamic cavitation dissolved gas reactor body 7; the region between the gas-collecting hood 11 and the overflow water-distributing weir 12 forms a rectifying reaction region 16.
Working principle: the oilfield produced water to be treated flows into the hydrodynamic cavitation dissolved gas reactor body 7 through the water inlet pipe 1, and the inflow direction is changed through the water inlet baffle plate 3 so as to flow downwards; the high-pressure (0.3 MPa-0.8 MPa) dissolved air water (10% -50% of total water quantity) passes through a dissolved air water decompression tube 2, the pressure drops sharply under the condition of high flow rate (3.0 m/s-30 m/s), a large number of tiny bubbles are released, the tiny bubbles are extremely unstable and are gradually combined into tiny bubbles of 30 um-60 um, the tiny bubbles flow into a dissolved air water mixing section 5 through a dissolved air water spray head 8 at high speed (10 m/s-50 m/s), the high-speed water flows through a rectifying plate 15 to form refraction to strengthen the mixing reaction, and the rectifying plate 15 is a porous plate (the open area is 1/2-2/3); the dissolved air water flowing in at high speed forms a negative pressure area in the dissolved air mixing area 51, raw water and return water are mixed in the return mixing area 41 by the return mixing section 4 under the action of negative pressure and then enter the dissolved air water mixing section 5, and the full mixing of the water inlet, the dissolved air water and the return water is completed in the dissolved air cavitation mixing area 51; simultaneously, the micro-bubbles expand and collapse under the action of negative pressure to generate cavitation effect, cavitation damages the hydration film on the surface of the oil droplets, so that the oil droplets are demulsified to form large oil droplets, the large oil droplets are more easily combined with the micro-bubbles, the physical demulsification is realized, and no chemical demulsifier is needed to be added; raw water and return water and dissolved air water are mixed in a dissolved air cavitation mixing zone 51 and then enter a dissolved air cavitation reaction section 6 through a rectifying plate 15.
The dissolved air cavitation reaction section 6 forms a dissolved air cavitation reaction zone 61 like a horn mouth, the initial flow rate is high, the terminal flow rate is low, a speed gradient is formed, and the combination of microbubbles and oil drops is enhanced; simultaneously, the microbubbles are combined to generate cavitation effect, the cavitation effect is easy to destroy a hydration film at the interface of the oil droplets, the oil droplets are promoted to be combined, and the combined large oil droplets are easier to combine with the microbubbles; part of bubbles enter the gas collecting hood 11 through the gas guiding plate 10 in the rising process, and the gas guiding plate 10 collects large bubbles and plays a role in rectification at the same time, so that the formation of a large bubble area at the top of a reaction area is prevented, the severe fluctuation of an oil layer is caused, and the reaction effect is influenced; the gas collecting hood 11 collects large bubbles to form a gas collecting area, and the gas collecting area is sucked and refluxed by utilizing a negative pressure area formed by the dissolved gas-water mixing section 5 through the gas reflux pipe 9 to further participate in the reaction, so that secondary dissolved gas is formed, and the dissolved gas mixing demulsification effect is enhanced;
after the dissolved air cavitation reaction in the dissolved air cavitation reaction zone 61 is completed, most of water flows downwards through the reflux zone 14, is mixed with raw water through the mixed flow mixing zone 41, and a small part of water flows upwards through the overflow water distribution weir 12 to enter the dissolved air flotation body 13 for oil-water separation.
According to the utility model, by utilizing the characteristic that the reflux gas-dissolving water has higher flow velocity, the internal circulation is formed in the gas-dissolving reactor, so that the contact opportunity of micro bubbles and oil droplets is increased; the reaction efficiency is improved, the reaction time is greatly reduced (the reaction time is reduced to 10S-40S from 3 min-5 min), and the volume of the dissolved gas reactor is reduced; in the internal circulation process, the combination probability among the microbubbles is increased, cavitation is generated by the combination of the microbubbles, coalescence of oil beads is promoted, and the demulsification effect is enhanced.
The utility model realizes the demulsification by a physical method without adding demulsifiers, thereby reducing the running cost; and collecting overflowed gas, forming negative pressure in the process of refluxing dissolved gas water jet, sucking the overflowed gas to form secondary dissolved gas, strengthening the dissolved gas effect, reducing the reflux quantity and reducing the energy consumption.
The above embodiments are merely examples of the present utility model, and the scope of the present utility model is not limited to the above embodiments, and any suitable changes or modifications made by those skilled in the art, which are consistent with the claims of the present utility model, shall fall within the scope of the present utility model.
Claims (10)
1. The dissolved air floatation device is characterized in that: comprises a dissolved air flotation body (13) and a dissolved air reactor arranged in the dissolved air flotation body (13); the dissolved gas reactor comprises a hydrodynamic cavitation dissolved gas reactor body (7), a water inlet pipe (1) and a dissolved gas water pressure reducing pipe (2); the water inlet pipe (1) is arranged on the side surface of the hydrodynamic cavitation dissolved air reactor body (7) and penetrates through the side wall of the dissolved air floatation body (13); the dissolved air water decompression pipe (2) is arranged at the bottom of the hydrodynamic cavitation dissolved air reactor body (7) and penetrates through the dissolved air floatation body (13); a shell and a gas collecting device positioned above the shell are arranged in the hydrodynamic cavitation gas-dissolving reactor body (7), and the shell is sequentially divided into a gas-dissolving cavitation reaction section (6), a gas-dissolving water mixing section (5) and a reflux mixing section (4) from top to bottom; the top of the dissolved air water decompression pipe (2) penetrates through the backflow mixing section (4) and extends into the dissolved air water mixing section (5), and the air collecting device is communicated with the dissolved air water mixing section (5) through an air return pipe (9).
2. The dissolved air flotation device of claim 1, wherein: the gas collecting device comprises a flow guide gas collecting plate (10) and a gas collecting cover (11), wherein the top of the flow guide gas collecting plate (10) is communicated with the gas collecting cover (11), and the gas collecting cover (11) is communicated with the gas-water mixing section (5) through a gas return pipe (9).
3. The dissolved air flotation device of claim 1, wherein: the top of the dissolved air water decompression pipe (2) is provided with a dissolved air water spray head (8).
4. The dissolved air flotation device of claim 1, wherein: and a rectifying plate (15) is arranged at the joint of the dissolved air-water mixing section (5) and the dissolved air cavitation reaction section (6).
5. The dissolved air flotation device of claim 1, wherein: the inner wall of the hydrodynamic cavitation dissolved gas reactor body (7) is provided with a water inlet baffle plate (3) which is positioned at the water outlet of the water inlet pipe (1).
6. The dissolved air flotation device of claim 5, wherein: the water inlet baffle (3) is of an inverted L-shaped structure.
7. The dissolved air flotation device of claim 2, wherein: an overflow water distribution weir (12) is arranged at the top of the hydrodynamic cavitation dissolved gas reactor body (7).
8. The dissolved air flotation device of claim 7, wherein: the reflux mixing section (4) forms a reflux mixing zone (41), the dissolved air-water mixing section (5) forms a dissolved air cavitation mixing zone (51), and the dissolved air cavitation reaction section (6) forms a dissolved air cavitation reaction zone (61); a rectifying reaction zone (16) is formed in the area between the gas collecting hood (11) and the overflow water distribution weir (12); the reflux area (14) is formed by the reflux mixing section (4), the dissolved air water mixing section (5) and the dissolved air cavitation reaction section (6) and the area formed between the outer part of the hydrodynamic cavitation dissolved air reactor body (7).
9. The dissolved air flotation device of claim 8, wherein: the dissolved air cavitation reaction zone (61) is horn-shaped.
10. The dissolved air flotation device of claim 8, wherein: the reflux mixing zone (41) is inverted horn-shaped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320276169.4U CN219259629U (en) | 2023-02-22 | 2023-02-22 | Dissolved air floatation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320276169.4U CN219259629U (en) | 2023-02-22 | 2023-02-22 | Dissolved air floatation device |
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| Publication Number | Publication Date |
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| CN219259629U true CN219259629U (en) | 2023-06-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320276169.4U Active CN219259629U (en) | 2023-02-22 | 2023-02-22 | Dissolved air floatation device |
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| CN (1) | CN219259629U (en) |
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- 2023-02-22 CN CN202320276169.4U patent/CN219259629U/en active Active
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