CN112759024A - Multistage non-pressure-loss oil field produced water pressure air-flotation oil removing equipment - Google Patents
Multistage non-pressure-loss oil field produced water pressure air-flotation oil removing equipment Download PDFInfo
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- CN112759024A CN112759024A CN202110174608.6A CN202110174608A CN112759024A CN 112759024 A CN112759024 A CN 112759024A CN 202110174608 A CN202110174608 A CN 202110174608A CN 112759024 A CN112759024 A CN 112759024A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
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- Hydrology & Water Resources (AREA)
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- Environmental & Geological Engineering (AREA)
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- Organic Chemistry (AREA)
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- Physical Water Treatments (AREA)
Abstract
The invention discloses a multi-stage pressure-loss-free oil field produced water pressure air floatation oil removing device, and relates to the field of oil field produced water treatment devices. The tank body is specifically comprised; the tank body is internally provided with a sewage inlet buffer cavity, a purified water outlet buffer cavity, a pressure air-flotation oil-water separation cavity and an oil slick collection cavity. A liquid inlet pipeline is arranged outside the tank body; the liquid inlet pipeline is communicated with the sewage inlet buffer cavity. The sewage inlet buffer cavity, the pressure air-flotation oil-water separation cavity and the purified water outlet buffer cavity are sequentially connected and communicated and are separated by a partition plate, and the three cavities are externally provided with an oil slick collecting cavity. The pressure air-flotation oil-water separation cavity and the floating oil collection cavity are separated by an overflow plate. The height of baffle is higher than the height of overflow plate, and is equipped with the clearance between the top of baffle and overflow plate and the top layer of jar body. The pressure air-float oil-water separation cavity is provided with a plurality of cavities. Compared with the prior art, the invention has the beneficial effects that: the device has simple integral structure and reliable principle, completes the multi-stage treatment and separation of the oily sewage through gravity, and can realize the use with no pressure loss and low energy consumption.
Description
Technical Field
The invention relates to the field of oilfield produced water treatment equipment, in particular to multistage non-pressure-loss oilfield produced water pressure air flotation oil removal equipment.
Background
In the existing pressure air flotation produced water treatment process, as shown in fig. 3, produced water (containing oil) is mixed with a demulsifier and a dissolved gas liquid fully by a mixer under about 0.2MPa, and then enters a level 1 air flotation device for deoiling, floating oil is discharged from the top of the level 1 air flotation device, and sewage containing a part of crude oil is discharged from the bottom of the level 1 air flotation device. And (3) sewage discharged from the bottom of the 1-stage air floatation device enters a mixer at the inlet of the 2-stage air floatation device, and the rest is done in the same way until the last stage 1, after the floating oil is discharged from the top, a floating oil collecting pipe is connected, and the purified water is discharged from the bottom.
The process has the following problems that the pressure drop of 0.1-0.15 MPa is inevitably generated in the process from the 1-stage air floatation to the last 4-stage air floatation. Secondly, when the air floatation production equipment with more than 2 levels is adopted, the whole process is complex, and the investment cost, the energy consumption and the failure rate of the equipment are increased; thirdly, because the pressure among the air floaters changes frequently, the liquid level control is required to be carried out continuously to ensure the treatment effect, but the operation difficulty is greatly increased and the oil-water separation effect is also influenced.
Disclosure of Invention
The invention provides a multistage pressure-loss-free oil field produced water pressure air flotation oil removing device which is characterized by simple overall structure and reliable principle, completes multistage treatment and separation of oily sewage through gravity and can realize use without pressure loss and low energy consumption.
In order to achieve the purpose, the invention provides the following technical scheme: the multi-stage non-pressure loss oil field produced water pressure air flotation oil removing equipment comprises a tank body; the tank body is internally provided with a sewage inlet buffer cavity, a purified water outlet buffer cavity, a pressure air-flotation oil-water separation cavity and an oil slick collection cavity.
A liquid inlet pipeline is arranged outside the tank body; the liquid inlet pipeline penetrates through the tank body and is communicated with the sewage inlet buffer cavity.
The sewage inlet buffer cavity is communicated with the pressure air floatation oil-water separation cavity through a lift pipe.
The pressure air-flotation oil-water separation cavity is communicated with the purified water outlet buffer cavity through a drain pipe.
The sewage water inlet buffer cavity, the pressure air-flotation oil-water separation cavity and the purified water outlet buffer cavity are sequentially connected, and the joint of the sewage water inlet buffer cavity and the pressure air-flotation oil-water separation cavity is separated from the joint of the pressure air-flotation oil-water separation cavity and the purified water outlet buffer cavity by the partition plate.
The floating oil collecting cavity is positioned outside the sewage inlet buffer cavity, the pressure air-flotation oil-water separation cavity and the purified water outlet buffer cavity, and the pressure air-flotation oil-water separation cavity and the floating oil collecting cavity are separated by an overflow plate.
The height of baffle is higher than the height of overflow plate, and is equipped with the clearance between the top of baffle and overflow plate and the top layer of jar body.
The pressure air floatation oil-water separation cavities are sequentially connected with one another; and the pressure air-flotation oil-water separation cavities are separated by partition plates and communicated through lift pipes.
The height of the outlet end of the drain pipe is less than or equal to that of the overflow plate and greater than that of the outlet end of the lift pipe.
As optimization, the liquid lifting pipes are provided with dissolved gas liquid injection devices; the height of the outlet end of the drain pipe is smaller than that of the overflow plate and larger than that of the outlet end of the lift pipe.
As optimization, the lower end of the floating oil collecting cavity is provided with a floating oil discharge pipe, and a floater liquid level regulator is arranged in the floating oil collecting cavity; the floater liquid level regulator is connected with a switch on the floating oil drain pipe.
As optimization, the lower end of the purified water outlet buffer cavity is provided with a purified water discharging pipe; a float liquid level regulator is arranged in the purified water outlet buffer cavity; the floater liquid level regulator is connected with a switch on the water purifying exhaust pipe.
As optimization, a gas pressure balance pipeline is arranged outside the upper end of the tank body; and the gas pressure balance pipeline is provided with a gas distribution bag and a self-operated pressure regulating valve.
Preferably, the liquid lifting pipe is of an L-shaped structure, the outlet end of the liquid lifting pipe is located at the center of the pressure air floatation oil-water separation cavity, and the inlet end of the liquid lifting pipe is located on one side of the lower end of the pressure air floatation oil-water separation cavity.
Compared with the prior art, the invention has the following beneficial effects: the device has simple integral structure and reliable principle, completes the multi-stage treatment and separation of the oily sewage by gravity, can realize the use without pressure loss and low energy consumption, and almost does not need to provide additional power energy; through reasonable layout in the tank body, the treatment efficiency and effect of the oily sewage are greatly improved, the occupied space is small, and the flow is short; meanwhile, the equipment can perform multi-level control according to specific actual conditions, and fine management is realized; the whole set of equipment is controlled by adopting a mechanical principle, so that unmanned control operation can be completely realized, and the safe operation of the equipment is ensured.
Drawings
Fig. 1 is a front view of the present invention.
Fig. 2 is a top view of the present invention.
FIG. 3 is a schematic structural diagram of a background art recording solution.
The device comprises a tank body 1, a liquid inlet pipeline 2, a sewage inlet buffer cavity 3, a purified water outlet buffer cavity 4, a partition plate 5, a pressure air-flotation oil-water separation cavity 6, an overflow plate 7, a liquid lifting pipe 8, a water discharging pipe 9, a floating oil discharging pipe 10, a purified water discharging pipe 11, a floater liquid level regulator 12, a floating oil collecting cavity 13, a dissolved gas liquid injection device 14, a gas distribution bag 15, a self-operated pressure regulating valve 16 and a gas pressure balance pipeline 17.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1:
the multi-stage non-pressure loss oil field produced water pressure air flotation oil removing equipment comprises a tank body 1; the tank body 1 is internally provided with a sewage inlet buffer chamber 3, a purified water outlet buffer chamber 4, a pressure air-flotation oil-water separation chamber 6 and a floating oil collection chamber 13. A liquid inlet pipeline 2 is arranged outside the tank body 1; the liquid inlet pipeline 2 penetrates through the tank body 1 and is communicated with the sewage inlet buffer cavity 3. The sewage inlet buffer cavity 3 is communicated with the pressure air floatation oil-water separation cavity 6 through a lift pipe 8. The pressure air-float oil-water separation cavity 6 is communicated with the purified water outlet buffer cavity 4 through a drain pipe 9. The sewage water inlet buffer chamber 3, the pressure air-flotation oil-water separation chamber 6 and the water purification water outlet buffer chamber 4 are sequentially connected, and the connection part of the sewage water inlet buffer chamber 3 and the pressure air-flotation oil-water separation chamber 6 is separated from the connection part of the pressure air-flotation oil-water separation chamber 6 and the water purification water outlet buffer chamber 4 by the partition plate 5. The floating oil collecting cavity 13 is positioned outside the sewage inlet buffer cavity 3, the pressure air-flotation oil-water separation cavity 6 and the purified water outlet buffer cavity 4, and the pressure air-flotation oil-water separation cavity 6 and the floating oil collecting cavity 13 are separated by an overflow plate 7. The height of the baffle 5 is higher than that of the overflow plate 7, and a gap is arranged between the top ends of the baffle 5 and the overflow plate 7 and the top layer of the tank body 1. The pressure air floatation oil-water separation cavities 6 are sequentially connected with one another; and the pressure air-flotation oil-water separation cavities 6 are separated by the partition plates 5 and communicated with each other through the lift pipes 8.
The outlet end of the drain pipe 9 is equal to the height of the overflow plate 7.
The lower end of the floating oil collecting cavity 13 is provided with a floating oil discharge pipe 10, and a floater liquid level regulator 12 is arranged in the floating oil collecting cavity 13; the float liquid level regulator 12 is connected with a switch on the floating oil drain pipe 10.
The lower end of the purified water outlet buffer chamber 4 is provided with a purified water discharging pipe 11; a float liquid level regulator 12 is arranged in the purified water outlet buffer cavity 4; the float liquid level regulator 12 is connected with a switch on the water purification calandria 11.
A gas pressure balance pipeline 17 is arranged outside the upper end of the tank body 1; the gas pressure balance pipeline 17 is provided with a gas distribution bag 15 and a self-operated pressure regulating valve 16.
The liquid lifting pipe 8 is of an L-shaped structure, the outlet end of the liquid lifting pipe is positioned at the center in the pressure air floatation oil-water separation cavity 6, and the inlet end of the liquid lifting pipe is positioned at one side of the lower end of the pressure air floatation oil-water separation cavity 6.
The working principle is as follows:
oily sewage enters a sewage inlet buffer cavity 3 through a liquid inlet pipeline 2 for buffer treatment, and then enters a pressure air-flotation oil-water separation cavity 6 through a lift pipe 8, wherein a plurality of pressure air-flotation oil-water separation cavities 6 are arranged.
After the oily sewage is injected into the pressure air-flotation oil-water separation cavity 6, the liquid level gradually rises until the liquid level is flush with the overflow plate 7, and the oil layer gradually floats to the upper part because the density of the oil is lower than that of the water, in addition, the dissolved gas is injected through the dissolved gas-liquid injection device 14 to disturb the liquid in the pressure air-flotation oil-water separation cavity 6, and after the oily sewage is continuously injected, the upper-layer floating oil overflows through the overflow plate 7 and enters the floating oil collection cavity 13 to be collected. The liquid level in the floating oil collecting cavity 13 is controlled by the float liquid level regulator 12, and when the liquid level is higher, the switch valve on the floating oil discharging pipe 10 is opened to discharge oil.
In the process of oil-water separation, water in the pressure air-flotation oil-water separation cavity 6 is continuously discharged into the next pressure air-flotation oil-water separation cavity 6 through the lift pipe 8, and oil-water layering treatment is continuously carried out. Here through the space design above baffle 5 and overflow plate 7, make each cavity top atmospheric pressure communicate, the below is through lift pipe 8 liquid phase intercommunication, utilize the U-shaped pipe principle, realize that multistage liquid level is unanimous, carry out multistage oil slick treatment and collect, the water of separation is then in discharging drain pipe 9 at last, because the up end and the overflow plate 7 parallel and level of drain pipe 9, consequently when ending for pure static state, the up end liquid level of water pipe 9 is parallel and level with the liquid phase in the pressure air slick water oil separating chamber 6, under the circumstances that medium surface tension and continuous injection cause the overflow to fluctuate, the water after the separation can constantly overflow to the water purification play in the cushion chamber 4 through the up end of drain pipe 9. The liquid level in the purified water outlet buffer chamber 4 is controlled by a float liquid level regulator 12, and when the liquid level is higher, the purified water discharging pipe 11 is opened.
Example 2:
example 2 differs from example 1 specifically in that: the outlet end height of the drain pipe 9 is less than the height of the overflow plate 7 and greater than the outlet end height of the lift pipe 8. The solution liquid spraying devices 14 are arranged on the liquid lifting pipes 8; the outlet end height of the drain pipe 9 is less than the height of the overflow plate 7 and greater than the outlet end height of the lift pipe 8.
The outlet end height of the drain pipe 9 here is smaller than the height of the overflow plate 7 and larger than the outlet end height of the lift pipe 8, and the outlet end height of the drain pipe 9 is slightly lower than the height of the overflow plate 7.
Because of the delay in the dynamic balance and the limited fluctuation of the liquid level caused by the floating oil during the overflow, because the drainage effect of the drainage pipe 9 may be relatively poor if the outlet end height of the drainage pipe 9 is perfectly parallel to the height of the overflow plate 7.
Therefore, the height of the outlet end of the drain pipe 9 is designed to be slightly lower than that of the overflow plate 7, and a solution-liquid spraying device 14 is arranged on each lift pipe 8; the solution-gas injection device 14 injects a large amount of bubbles into the lift pipe 8 to cause fluctuation of the liquid level surface in the pressure air-flotation oil-water separation chamber 6, thereby improving the drainage effect of the drainage pipe 9.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (6)
1. Multistage non-pressure loss oil field produced water pressure air supporting deoiling equipment, its characterized in that: comprises a tank body (1); a sewage inlet buffer cavity (3), a purified water outlet buffer cavity (4), a pressure air-flotation oil-water separation cavity (6) and a floating oil collection cavity (13) are arranged in the tank body (1);
a liquid inlet pipeline (2) is arranged outside the tank body (1); the liquid inlet pipeline (2) penetrates through the tank body (1) and is communicated with the sewage inlet buffer cavity (3);
the sewage inlet buffer cavity (3) is communicated with the pressure air floatation oil-water separation cavity (6) through a lift pipe (8);
the pressure air-flotation oil-water separation cavity (6) is communicated with the purified water outlet buffer cavity (4) through a drain pipe (9);
the sewage inlet buffer cavity (3), the pressure air-flotation oil-water separation cavity (6) and the purified water outlet buffer cavity (4) are sequentially connected, and the joint of the sewage inlet buffer cavity (3) and the pressure air-flotation oil-water separation cavity (6) and the joint of the pressure air-flotation oil-water separation cavity (6) and the purified water outlet buffer cavity (4) are separated by a partition plate (5);
the floating oil collecting cavity (13) is positioned outside the sewage inlet buffer cavity (3), the pressure air-flotation oil-water separation cavity (6) and the purified water outlet buffer cavity (4), and the pressure air-flotation oil-water separation cavity (6) is separated from the floating oil collecting cavity (13) by an overflow plate (7);
the height of the partition plate (5) is higher than that of the overflow plate (7), and a gap is formed between the top ends of the partition plate (5) and the overflow plate (7) and the top layer of the tank body (1);
the pressure air floatation oil-water separation cavities (6) are sequentially connected and provided with a plurality of air floatation oil-water separation cavities; the pressure air flotation oil-water separation cavities (6) are separated by partition plates (5) and communicated with each other through lift pipes (8);
the height of the outlet end of the drain pipe (9) is less than or equal to that of the overflow plate (7) and greater than that of the outlet end of the lift pipe (8).
2. The multi-stage pressure-loss-free oilfield produced water pressure air flotation oil removal equipment as recited in claim 1, wherein: dissolved air releasers (14) are arranged on the liquid lifting pipes (8); the height of the outlet end of the drain pipe (9) is less than that of the overflow plate (7) and greater than that of the outlet end of the lift pipe (8).
3. The multi-stage pressure-loss-free oilfield produced water pressure air flotation oil removal equipment as recited in claim 1, wherein: the lower end of the floating oil collecting cavity (13) is provided with a floating oil discharge pipe (10), and a floater liquid level regulator (12) is arranged in the floating oil collecting cavity (13); the floater liquid level regulator (12) is connected with a switch on the floating oil drain pipe (10).
4. The multi-stage pressure-loss-free oilfield produced water pressure air flotation oil removal equipment as recited in claim 1, wherein: the lower end of the purified water outlet buffer cavity (4) is provided with a purified water discharging pipe (11); a float liquid level regulator (12) is arranged in the purified water outlet buffer cavity (4); the floater liquid level regulator (12) is connected with a switch on the water purifying calandria (11).
5. The multi-stage pressure-loss-free oilfield produced water pressure air flotation oil removal equipment as recited in claim 1, wherein: a gas pressure balance pipeline (17) is arranged outside the upper end of the tank body (1); the gas pressure balance pipeline (17) is provided with a gas distribution bag (15) and a self-operated pressure regulating valve (16).
6. The multi-stage pressure-loss-free oilfield produced water pressure air flotation oil removal equipment as recited in claim 1, wherein: the liquid lifting pipe (8) is of an L-shaped structure, the outlet end of the liquid lifting pipe is positioned at the center in the pressure air-flotation oil-water separation cavity (6), and the inlet end of the liquid lifting pipe is positioned at one side of the lower end of the pressure air-flotation oil-water separation cavity (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110174608.6A CN112759024A (en) | 2021-02-07 | 2021-02-07 | Multistage non-pressure-loss oil field produced water pressure air-flotation oil removing equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110174608.6A CN112759024A (en) | 2021-02-07 | 2021-02-07 | Multistage non-pressure-loss oil field produced water pressure air-flotation oil removing equipment |
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| CN112759024A true CN112759024A (en) | 2021-05-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110174608.6A Pending CN112759024A (en) | 2021-02-07 | 2021-02-07 | Multistage non-pressure-loss oil field produced water pressure air-flotation oil removing equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115990587A (en) * | 2023-01-19 | 2023-04-21 | 中国神华煤制油化工有限公司 | Cleaning equipment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201648034U (en) * | 2009-12-08 | 2010-11-24 | 江苏三星化工有限公司 | Air floatation sewage treatment unit |
| WO2013005952A2 (en) * | 2011-07-01 | 2013-01-10 | 서울시립대학교 산학협력단 | System for treating sewerage overflow using apparatus for automatically measuring water quality and dissolved air floatation |
-
2021
- 2021-02-07 CN CN202110174608.6A patent/CN112759024A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201648034U (en) * | 2009-12-08 | 2010-11-24 | 江苏三星化工有限公司 | Air floatation sewage treatment unit |
| WO2013005952A2 (en) * | 2011-07-01 | 2013-01-10 | 서울시립대학교 산학협력단 | System for treating sewerage overflow using apparatus for automatically measuring water quality and dissolved air floatation |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115990587A (en) * | 2023-01-19 | 2023-04-21 | 中国神华煤制油化工有限公司 | Cleaning equipment |
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