CN215592663U - Self-gas circulation multistage pressure type dissolved air floatation system - Google Patents
Self-gas circulation multistage pressure type dissolved air floatation system Download PDFInfo
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- CN215592663U CN215592663U CN202121919371.1U CN202121919371U CN215592663U CN 215592663 U CN215592663 U CN 215592663U CN 202121919371 U CN202121919371 U CN 202121919371U CN 215592663 U CN215592663 U CN 215592663U
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Abstract
The utility model discloses a self-gas circulation multistage pressure type dissolved air floatation system, and relates to the technical field of water treatment. The device comprises a first-stage air flotation separation tank, a second-stage air flotation separation tank, an oil gas recovery tank and a dissolved gas pipe. A water inlet pipeline is arranged at the inlet end of the first-stage air floatation separation tank; the first-stage air flotation separation tank is communicated with the second-stage air flotation separation tank; a water outlet pipeline is arranged outside the secondary air floatation separation tank. The first-stage air flotation separation tank and the second-stage air flotation separation tank are communicated with the oil gas recovery tank. The oil gas recovery tank is communicated with the inlet end of the multiphase dissolved air pump. A multiphase dissolved air pump is arranged between the dissolved air pipe and the water outlet pipeline. The dissolved air pipe is provided with a dissolved air branch pipe which is respectively communicated with the first-stage air-flotation separation tank and the second-stage air-flotation separation tank. Compared with the prior art, the utility model has the beneficial effects that: the treatment efficiency and the treatment effect of the oilfield produced water are improved, the water pressure from the front end is fully utilized, energy is saved, consumption is reduced, meanwhile, the gas carried in the produced water is fully utilized to dissolve the gas for circulation, and the discharge of VOCs and harmful gas is avoided.
Description
Technical Field
The utility model relates to the technical field of water treatment, in particular to a self-gas circulation multistage pressure type dissolved air flotation system.
Background
At present, in the field of oilfield produced water treatment, the most common oil removal technology is gravity settling, but the process occupies a large area and has limited treatment precision. In the air floatation process, the oil droplets are accelerated to float upwards under the action of buoyancy through adhesion of the micro bubbles and the oil droplets, so that the oil removing efficiency can be greatly improved.
No matter the gravity settling or the air flotation device commonly used in the oil field at present works under the normal pressure condition, and the pressure of the water coming from the front end can be discharged after the sewage is treated by the gravity settling or the air flotation, so that the energy waste is caused. The sewage is contacted with the surrounding environment, so that not only is the sewage aerated with oxygen, but also toxic, harmful, flammable and explosive substances in the sewage are emitted into the surrounding environment to cause secondary pollution. If the chloride ion content of produced water of some oil fields is high, the corrosion of subsequent process equipment and pipelines can be aggravated after the water is subjected to oxygen exposure; if the space on the offshore oil platform is narrow, flammable and explosive gas contained in the sewage is emitted to the surrounding environment, and the hidden danger of fire can be increased.
Meanwhile, most of the traditional air floatation processes adopt an air compressor, a fan and a nitrogen making machine to provide an air source, and are usually normal-pressure open containers, bubbles float upwards after being treated in air floatation until the bubbles disappear from the liquid level, and the air floatation processes are large in air loss and high in energy consumption. The gases carry a small amount of pollutants into the atmosphere, and the generated VOCs gases cause secondary pollution to the surrounding environment. Hydrogen sulfide and flammable and explosive gases contained in the produced water of the oil field are emitted to the surrounding environment, and the danger of poisoning and fire is increased.
SUMMERY OF THE UTILITY MODEL
The utility model provides a self-gas circulation multistage pressure type dissolved air floatation system which is characterized by improving the treatment efficiency and treatment effect of oilfield produced water, fully utilizing the water pressure from the front end, saving energy and reducing consumption, and simultaneously fully utilizing the gas carried in the produced water to carry out dissolved air circulation, thereby avoiding the discharge of VOCs and harmful gas.
In order to achieve the purpose, the utility model provides the following technical scheme: a self-gas circulation multistage pressure type dissolved air flotation system comprises a first-stage air flotation separation tank, a second-stage air flotation separation tank, an oil gas recovery tank and a dissolved gas pipe. The inlet end of the first-stage air floatation separation tank is connected with a water inlet pipeline; the primary air-flotation separation tank is connected with the secondary air-flotation separation tank through a water outlet pipeline of the primary air-flotation separation tank; and a water outlet pipeline is connected outside the secondary air floatation separation tank. The upper ends of the first-stage air flotation separation tank and the second-stage air flotation separation tank are communicated with the oil gas recovery tank through an air flotation separation tank exhaust pipeline. An air return port is arranged on the oil gas recovery tank; the air return port is communicated with the inlet end of the multiphase dissolved air pump through an air return pipeline. And a multiphase dissolved air pump is arranged between the dissolved air pipe and the water outlet pipeline. And the dissolved air pipe is provided with a dissolved air branch pipe which is respectively communicated with the water inlet pipeline and the water outlet pipeline of the primary air floatation separation tank.
As optimization, a mixing reactor is arranged on the water inlet pipeline and the water outlet pipeline of the primary air floatation separation tank; the mixing reactors are provided with dosing ports; the medicine adding port is externally connected with a medicine dissolving tank through a medicine supplementing pipeline; and a diaphragm metering pump is arranged on the medicine supplementing pipeline.
Preferably, a stirrer is arranged in the medicine dissolving tank.
As optimization, a water inlet exhaust tank is arranged on the water inlet pipeline; the top end of the water inlet exhaust tank is provided with an exhaust pipeline, and the lower end of the water inlet exhaust tank is provided with a drainage pipeline; an auxiliary pipeline is arranged on the oil gas recovery tank; the exhaust pipeline is communicated with the auxiliary pipeline.
As optimization, an emptying pipeline is arranged on the oil gas recovery tank; and a pressure regulating valve is arranged on the emptying pipeline.
And optimally, the outside of the oil gas recovery tank is connected with a storage tank through an air supply pipeline.
Preferably, the storage tank is a nitrogen storage tank or a natural gas storage tank.
As optimization, the lower ends of the first-stage air floatation separation tank and the second-stage air floatation separation tank are provided with sewage outlets; a sewage discharge pipeline is connected outside the sewage discharge outlet; and a sewage pump is arranged on the sewage pipeline.
And optimally, the lower part of the oil gas recovery tank is connected with a sewage discharge pipeline.
And optimally, a liquid level meter is arranged on the oil gas recovery tank.
Compared with the prior art, the utility model has the following beneficial effects: aiming at the defects that the existing atmospheric pressure degreaser is not closed and the separation efficiency of the pressurized degreaser is low, and the energy loss caused by the gas released in the separation process and the pollution to the surrounding environment caused by the generated VOCs and harmful gases are generated, a self-gas circulation multistage pressure type dissolved air flotation skid block applied to the treatment of the produced water of the oil field is developed. The device I can fully utilize the pressure of front-end incoming water, save energy, reduce consumption and improve the treatment efficiency and treatment effect of oilfield produced water; the gas carried in the produced water and the redundant gas generated by air floatation separation can be fully recycled, the treatment efficiency is good, the energy consumption is low, the discharge of VOCs and harmful gas is avoided, and no secondary pollution is caused; thirdly, negative pressure air suction is adopted, so that the air dissolving effect is stable, and the separation effect is good; fourthly, nitrogen or natural gas is adopted for supplementing gas, so that the safety and stability are high, and energy conservation and consumption reduction can be realized; and fifthly, automatic control is adopted, operation management is facilitated, and unattended operation can be realized.
Drawings
Fig. 1 is a schematic view of the connection structure of the present invention.
The device comprises a water inlet pipeline 1, a water inlet and exhaust tank 2, a primary air flotation separation tank 3, a secondary air flotation separation tank 4, an exhaust pipeline 5, a water discharge pipeline 6, a mixing reactor 7, a dissolved air pipe 8, a dissolved medicine tank 9, a storage tank 10, an oil gas recovery tank 11, a sewage discharge pipeline 12, an auxiliary pipeline 13, a multiphase dissolved air pump 14, an air flotation separation tank exhaust pipeline 15, a primary air flotation separation tank water outlet pipeline 16, a water outlet pipeline 17, an air return pipeline 18, a vent pipeline 19, an air supply pipeline 20, a sewage discharge pump 21, a medicine supply pipeline 22, a diaphragm metering pump 23, a sewage discharge outlet 24 and a dissolved air branch pipe 25.
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.
The utility model provides a multistage pressure type dissolved air floatation system of self-gas circulation which characterized in that: comprises a first-stage air flotation separation tank 3, a second-stage air flotation separation tank 4, an oil gas recovery tank 11 and a dissolved gas pipe 8; the inlet end of the first-stage air floatation separation tank 3 is connected with a water inlet pipeline 1; the primary air-flotation separation tank 3 is connected with the secondary air-flotation separation tank 4 through a primary air-flotation separation tank water outlet pipeline 16; a water outlet pipeline 17 is connected outside the secondary air floatation separation tank 4; the upper ends of the first-stage air floatation separation tank 3 and the second-stage air floatation separation tank 4 are communicated with an oil gas recovery tank 11 through an air floatation separation tank exhaust pipeline 15; an air return port is arranged on the oil gas recovery tank 11; the air return port is communicated with the inlet end of the multiphase dissolved air pump 14 through an air return pipeline 18; a multiphase dissolved air pump 14 is arranged between the dissolved air pipe 8 and the water outlet pipeline 17; and a dissolved air branch pipe 25 communicated with the water inlet pipeline 1 and the water outlet pipeline 16 of the first-stage air floatation separation tank is arranged on the dissolved air pipe 8.
The water inlet pipeline 1 and the water outlet pipeline 16 of the first-stage air floatation separation tank are both provided with a mixing reactor 7; the mixing reactors 7 are provided with dosing ports; the medicine adding port is externally connected with a medicine dissolving tank 9 through a medicine supplementing pipeline 22; and a diaphragm metering pump 23 is arranged on the medicine supplementing pipeline 22.
A stirrer is arranged in the medicine dissolving tank 9.
The water inlet pipeline 1 is provided with a water inlet exhaust tank 2; the top end of the water inlet exhaust tank 2 is provided with an exhaust pipeline 5, and the lower end of the water inlet exhaust tank 2 is provided with a drainage pipeline 6; an auxiliary pipeline 13 is arranged on the oil gas recovery tank 11; the exhaust pipeline 5 is communicated with the auxiliary pipeline 13.
An emptying pipeline 19 is arranged on the oil gas recovery tank 11; and a pressure regulating valve is arranged on the emptying pipeline 19. And a liquid level meter is arranged on the oil gas recovery tank 11.
The oil gas recovery tank 11 is externally connected with a storage tank 10 through an air supplement pipeline 20. The storage tank 10 is a nitrogen storage tank or a natural gas storage tank.
The lower ends of the first-stage air floatation separating tank 3 and the second-stage air floatation separating tank 4 are provided with a sewage outlet 24; a sewage discharge pipeline 12 is connected outside the sewage discharge port 24; a sewage pump 21 is arranged on the sewage pipeline 12. The lower part of the oil gas recovery tank 11 is connected with a sewage discharge pipeline 12.
The working principle is as follows:
sewage or oil field produced water enters a water inlet and exhaust tank 2 through a water inlet pipeline 1, gas in the water inlet and exhaust tank 2 is discharged through an exhaust pipeline 5 and an auxiliary pipeline 13 and is conveyed into an oil gas recovery tank 11, oily sewage in the water inlet and exhaust tank 2 enters a mixing reactor 7 through a water discharge pipeline 6 and finally enters a primary air-flotation separation tank 3, the water is dissolved through backflow in a dissolved air pipe 8 and is combined with oil drops and a reverse demulsifier to form an air floating body with the density far smaller than that of water, the air floating body is quickly floated and collected to the top of the primary air-flotation separation tank 3, and gas carried in water and redundant gas generated by air-flotation separation enter the oil gas recovery tank 11 through an air-flotation separation tank exhaust pipeline 15.
Silt contained in the residual water in the first-stage air-flotation separation tank 3 settles at the bottom of the air-flotation tank, and the water after the first-stage filtration enters the second-stage air-flotation separation tank 4 after being further mixed by the water outlet pipeline 16 of the first-stage air-flotation separation tank and the mixing reactor 7, and circulates according to the mixture until being discharged by the water outlet pipeline 17.
In the process, the medicament in the medicament dissolving tank 9 is respectively injected into the mixing reactor 7 on the water inlet pipeline 1 and the mixing reactor 7 on the water outlet pipeline 16 of the first-stage air floatation separation tank through the diaphragm metering pump 23, and whether the medicament is added or not can be determined according to specific conditions.
Wherein, the backward flow gas water that dissolves in the gas dissolving pipe 8 is concrete through outlet pipe 17 exhaust water and through intaking exhaust can 2, one-level air supporting knockout drum 3, the formation is mixed to the gas of 4 liftouts in second grade air supporting knockout drum, when the gas condition that exists not enough, carry out gas supply to oil gas recovery jar 11 through storage tank 10, the gas of replenishment can be nitrogen gas also can be the natural gas, simultaneously through the pressure regulating valve on the oil gas recovery jar 11, keep the pressure constancy in the oil gas recovery jar 11, realize the interlocking of tonifying qi volume and suction pressure and regulate and control.
Silt at the bottoms of the first-stage air flotation separation tank 3, the second-stage air flotation separation tank 4 and the oil gas recovery tank 11 can be discharged through a sewage discharge pipeline 12.
Wherein, the whole equipment is provided with a corresponding automatic control system and adopts full-automatic operation; the automatic oil collection and automatic exhaust can be realized; the dissolved gas water amount can be interlocked with the device operation flow or pressure for automatic adjustment, so that the optimal treatment effect is ensured; the online detection and real-time remote transmission of production data such as water quantity, pressure, operation state and the like can be realized, a data report and an operation curve are automatically generated, and an alarm is automatically given when the data are abnormal; and the running state of the equipment is detected on line, and the fault automatic alarm is given. The system can also be matched with video monitoring facilities and remotely transmits video signals in real time. The whole set of automatic control system can be connected with a computer through a network and also can be connected with a mobile phone, and an operation manager can realize real-time mastering of operation data and remote regulation and control of the device through the computer or the mobile phone.
Claims (10)
1. A self-gas circulation multistage pressure type dissolved air flotation system comprises a primary air flotation separation tank (3), a secondary air flotation separation tank (4), an oil gas recovery tank (11) and a dissolved gas pipe (8); the method is characterized in that: the inlet end of the first-stage air floatation separation tank (3) is connected with a water inlet pipeline (1); the primary air-flotation separation tank (3) is connected with the secondary air-flotation separation tank (4) through a primary air-flotation separation tank water outlet pipeline (16); a water outlet pipeline (17) is connected outside the secondary air floatation separation tank (4); the upper ends of the first-stage air floatation separating tank (3) and the second-stage air floatation separating tank (4) are communicated with an oil gas recovery tank (11) through an air floatation separating tank exhaust pipeline (15); an air return port is arranged on the oil gas recovery tank (11); the air return port is communicated with the inlet end of the multiphase dissolved air pump (14) through an air return pipeline (18); a multiphase dissolved air pump (14) is arranged between the dissolved air pipe (8) and the water outlet pipeline (17); and a dissolved air branch pipe (25) which is respectively communicated with the water inlet pipeline (1) and the water outlet pipeline (16) of the primary air floatation separation tank is arranged on the dissolved air pipe (8).
2. The self-gas circulation multistage pressure type dissolved air flotation system according to claim 1, characterized in that: a mixing reactor (7) is arranged on the water inlet pipeline (1) and the water outlet pipeline (16) of the first-stage air floatation separation tank; the mixing reactors (7) are provided with medicine feeding ports; a medicine dissolving tank (9) is connected outside the medicine adding port through a medicine supplementing pipeline (22); and a diaphragm metering pump (23) is arranged on the medicine supplementing pipeline (22).
3. The self-gas circulation multistage pressure dissolved air flotation system according to claim 2, characterized in that: a stirrer is arranged in the medicine dissolving tank (9).
4. The self-gas circulation multistage pressure type dissolved air flotation system according to claim 1, characterized in that: a water inlet exhaust tank (2) is arranged on the water inlet pipeline (1); an exhaust pipeline (5) is arranged at the top end of the water inlet exhaust tank (2), and a drainage pipeline (6) is arranged at the lower end of the water inlet exhaust tank (2); an auxiliary pipeline (13) is arranged on the oil gas recovery tank (11); the exhaust pipeline (5) is communicated with the auxiliary pipeline (13).
5. The self-gas circulation multistage pressure type dissolved air flotation system according to claim 1, characterized in that: an emptying pipeline (19) is arranged on the oil gas recovery tank (11); and a pressure regulating valve is arranged on the emptying pipeline (19).
6. The self-gas circulation multistage pressure type dissolved air flotation system according to claim 1, characterized in that: the oil gas recovery tank (11) is externally connected with a storage tank (10) through an air supplement pipeline (20).
7. The self-gas circulation multistage pressure dissolved air flotation system according to claim 6, characterized in that: the storage tank (10) is a nitrogen storage tank or a natural gas storage tank.
8. The self-gas circulation multistage pressure type dissolved air flotation system according to claim 1, characterized in that: the lower ends of the first-stage air floatation separating tank (3) and the second-stage air floatation separating tank (4) are provided with sewage outlets (24); a sewage discharge pipeline (12) is connected outside the sewage discharge port (24); and a sewage pump (21) is arranged on the sewage pipeline (12).
9. The self-gas circulation multi-stage pressure type dissolved air flotation system according to claim 8, wherein: the lower part of the oil gas recovery tank (11) is connected with a sewage discharge pipeline (12).
10. The self-gas circulation multistage pressure type dissolved air flotation system according to claim 1, characterized in that: and a liquid level meter is arranged on the oil gas recovery tank (11).
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| CN202121919371.1U CN215592663U (en) | 2021-08-17 | 2021-08-17 | Self-gas circulation multistage pressure type dissolved air floatation system |
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| CN202121919371.1U CN215592663U (en) | 2021-08-17 | 2021-08-17 | Self-gas circulation multistage pressure type dissolved air floatation system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116354438A (en) * | 2023-06-01 | 2023-06-30 | 中海石油(中国)有限公司 | Vertical shallow air floatation-based gas-containing oil field produced water treatment device and method |
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2021
- 2021-08-17 CN CN202121919371.1U patent/CN215592663U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116354438A (en) * | 2023-06-01 | 2023-06-30 | 中海石油(中国)有限公司 | Vertical shallow air floatation-based gas-containing oil field produced water treatment device and method |
| CN116354438B (en) * | 2023-06-01 | 2023-08-18 | 中海石油(中国)有限公司 | Vertical shallow air floatation-based gas-containing oil field produced water treatment device and method |
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