Rotational flow air flotation oil removal device

Abstract

The utility model aims to provide a rotational flow air flotation oil removal device, and belongs to the technical field of oily wastewater treatment equipment. The device comprises a sealed tank body, wherein a pressurizing area, a cyclone separation area and a dissolved gas area are sequentially arranged in the tank body from top to bottom; a gas inlet connected with a gas inlet pipeline and a gas transmission port connected with a gas transmission pipeline are respectively formed in the top of the pressurizing area; a spiral separation plate is arranged in the cyclone separation area, an oil collection barrel is arranged on the inner side of the spiral separation plate, and an oil discharge pipe is arranged in the oil collection barrel; a liquid inlet distributed along the tangent position of the tank body is formed in the tank body of the cyclone separation area; a gas dissolving head is arranged in the gas dissolving area, and a drain outlet and a clear water outlet are formed in the bottom of the tank body; and an oil gas monitor, an oil water monitor and a pressure sensor are arranged on the tank body. According to the utility model, rotational flow centrifugal separation, air flotation separation and gas-driven liquid level control technologies are integrated in the sealed tank body, so that the device is small in occupied area, capable of realizing continuous online treatment, excellent in treated water quality, high in treatment efficiency, simple in structure and safe and reliable in operation.

Description

TECHNICAL FIELD

[0001] The utility model relates to an oil-containing wastewater treatment equipment technical field, concretely relates to a cyclone oil removal device of air floatation. BACKGROUND

[0002] The oil-containing wastewater is produced by a large amount of abandoned drilling fluid, fracturing flowback fluid, oil-water well measure waste liquid and the like in the oilfield development process. The method for treating the wastewater usually is that large container such as kiloton tank or ten-thousand-ton pool is used to separate by standing, or simple filter device is used to treat. The main defects of the conventional treatment method include that the land occupation is large, continuous treatment is impossible, the water quality after treatment is not up to standard, and the automation degree is low. UTILITY MODEL CONTENT

[0003] The utility model discloses a cyclone oil removal device of air floatation, which integrates cyclone centrifugal separation, air floatation separation and gas-driven liquid level control technology in a sealed tank body, has small land occupation, can continuously treat online, has excellent water quality after treatment, has high treatment efficiency, has simple structure and safe and reliable operation.

[0004] To achieve the above object, the utility model adopts the following technical scheme: a cyclone oil removal device of air floatation, comprising a sealed tank body, a booster zone, a cyclone separation zone and a dissolved air zone are sequentially arranged in the tank body from top to bottom.

[0005] The top of the booster zone is respectively provided with an air inlet connected with an air inlet pipeline and an air outlet connected with an air outlet pipeline, and the other end of the air outlet pipeline is connected with a dissolved air pump.

[0006] A spiral separation plate is arranged in the cyclone separation zone, an oil collecting barrel is arranged on the inner side of the spiral separation plate, and an oil discharge pipe is arranged in the oil collecting barrel; and a liquid inlet is arranged on the tank body of the cyclone separation zone along the tangential position of the tank body.

[0007] A dissolved air head is arranged in the dissolved air zone, and a blowdown port and a clean water discharge port are arranged at the bottom of the tank body.

[0008] An oil-gas monitor, an oil-water monitor and a pressure sensor are arranged on the tank body.

[0009] As an improvement of the utility model, an electric control cabinet and a mounting bracket are further arranged, and the electric control cabinet and the tank body are mounted on the mounting bracket.

[0010] The electric control cabinet comprises a PLC controller.

[0011] As an improvement of the utility model, an electric control valve is arranged on the air inlet pipeline, and the oil-gas monitor, the oil-water monitor, the pressure sensor and the electric control valve are connected with the PLC controller through signal lines.

[0012] As an improvement of the utility model, the clear water outlet is provided with a baffle for preventing impurities from entering the clear water pipeline.

[0013] As an improvement of the utility model, the upper portion of the clear water outlet is provided with a baffle for preventing impurities from entering the clear water pipeline.

[0014] As an improvement of the utility model, the multi-phase dissolved air system comprises a dissolved air pump and a dissolved air tank, one end of the dissolved air tank is connected with the outlet of the dissolved air pump, and the other end is connected with the dissolved air head.

[0015] The oil removal device has the advantages that: the oil removal device is self-controlled pressure type, and thus, the device can be directly connected with subsequent precise filtration processes such as filter material filters, without the need of additional auxiliary equipment such as booster pumps, thereby saving cost; meanwhile, the device does not need to add any chemical agent during operation, and does not pollute the original water quality, and thus, can be widely applied to wastewater treatment in mechanical processing, oil fields and other industrial and mining industries.

[0016] Further, the electric control cabinet and the tank body are installed on the mounting bracket; and the electric control cabinet comprises a PLC controller.

[0017] Further, the oil gas monitor, the oil water monitor, the pressure sensor and the electric control valve are connected with the PLC controller through signal lines.

[0018] Further, the upper portion of the clear water outlet is provided with a baffle for preventing impurities from entering the clear water pipeline. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 Fig. 1 is a structural schematic view of the utility model;

[0020] Figure 2 Fig. 2 is a structural schematic view of the utility model installed on a mounting bracket;

[0021] Figure 3 Fig. 1 is a left view of the application. Figure 2 Fig. 2 is a right view of the application.

[0022] In the figure, 1 is a tank body; 101 is a pressurization zone; 102 is a cyclone separation zone; 103 is a dissolved air zone; 2 is a gas conveying pipeline; 3 is a pressure dissolved air tank; 4 is a dissolved air pump; 5 is a clean water discharge outlet; 6 is a baffle; 7 is a dissolved air head; 8 is an oil collecting barrel; 9 is a spiral separation plate; 10 is an oil discharge pipe; 11 is an oil-water monitor; 12 is an oil-gas monitor; 13 is an air inlet pipeline; 14 is an oil discharge pipeline; 15 is a PLC control cabinet; 16 is a blowdown outlet; 17 is a mounting bracket; 18 is a liquid inlet pipeline. DETAILED DESCRIPTION

[0023] The embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only, and are used only for explaining the present application, and cannot be interpreted as a limitation of the present application.

[0024] As Figure 1As shown, a cyclone oil removal device includes a sealed tank body 1, which is provided with a pressurization zone 101, a cyclone separation zone 102 and a dissolved air zone 103 from top to bottom. The pressurization zone 101 is mainly for gas, and the oil level and oil discharge amount are controlled by pressure change. The cyclone separation zone 102 is a composite zone, in which oil-containing wastewater and bubbles in the dissolved air water adhere to form lighter oil droplets, which rapidly float upward to form an oil layer under the action of rotational centripetal force. The dissolved air zone 103 is a zone in which the fine bubbles contained in the dissolved air water are uniformly mixed with water, and the oil droplets in the wastewater adhere to the bubbles to accelerate the upward floating speed. The top of the pressurization zone 101 is respectively provided with an air inlet connected with an air inlet pipeline 13 and an air outlet connected with an air outlet pipeline 2, and the other end of the air outlet pipeline 2 is connected with a dissolved air pump 4. In order to further mix the gas-water mixture uniformly and further refine the bubble particles of the dissolved air water, a dissolved air tank 3 is connected at the outlet end of the dissolved air pump 13, and the outlet of the dissolved air tank 3 is connected with a dissolved air head 7 through a pipeline. Preferably, in order to further improve the dissolved air effect of the pressure type dissolved air tank 3, a stepped ring, a Raschig ring or the like filler can be added inside the tank. The cyclone separation zone 102 is provided with a spiral separation plate 9, which is preferably connected to the inner wall of the tank body 1. An oil collection bucket 8 is arranged on the inner side of the spiral separation plate 9, and an oil discharge pipeline 10 is arranged in the oil collection bucket 8. One end of the oil discharge pipeline 10 extends downward to the bottom of the oil collection bucket 8, and the other end extends upward to the outside of the tank body 1 and is connected with an oil discharge pipeline 14. The tank body 1 of the cyclone separation zone 103 is provided with liquid inlets distributed along the tangential position of the tank body 1, and the liquid inlets are connected with liquid inlet pipelines 18. The liquid inlets are distributed along the tangential direction of the tank body 1, so that the fluid in the tank body 1 can quickly form a cyclone state, further optimizing the separation effect. The dissolved air zone 103 is provided with a dissolved air head 7, and the lower part of the dissolved air head 7 is mainly clean water after purification. The bottom of the tank body 1 is provided with a sewage outlet 16 and a clean water outlet 5. The tank body 1 is provided with an oil-gas monitor 12, an oil-water monitor 11 and a pressure sensor.

[0025] The clean water outlet 5 is provided with two clean water outlets, one of which is directly discharged outside the tank body 1 through a pipeline, and the other of which is connected with the dissolved air pump 4 through a pipeline to provide water source for the dissolved air pump 4. Preferably, a baffle 6 is arranged above the clean water outlet 5 to prevent impurities from entering the clean water pipeline.

[0026] As shown in the drawings, Figure 2 and Figure 3As shown, the device further comprises an electric control cabinet 15 and a mounting bracket 17, and the electric control cabinet 15 and the tank body 1 are both mounted on the mounting bracket 17; the electric control cabinet 15 comprises a PLC controller. The air inlet pipeline 13 is provided with an electric control valve, and the oil gas monitor 12, the oil water monitor 11, the pressure sensor and the electric control valve are all connected with the PLC controller through signal lines. By mounting the electric control cabinet 15 and the tank body 1 on the mounting bracket 17, the structure is simple and compact, and the device is convenient to assemble, disassemble and transport. By means of the sensor feedback signals of the oil gas monitor 12 and the oil water monitor 11, the interface between the gas, the oil and the water in the tank body 1 is determined, and then the PLC controller is used to control the size of the opening of the electric control valve, the rotating speed of the motor and the like to control the pressure, the liquid level and the flow rate in the tank body, so that the gas, the oil and the water in the whole tank body are always controlled in a reasonable range, the purpose of oil water separation is achieved, and the degree of automation is high.

[0027] The working principle of the embodiment is as follows: first, the air inlet pipeline 13 is opened, and clean water is injected into the tank body 1 to the position of the oil gas monitor 12, and the dissolved air pump 4 is started to form an internal dissolved air circulation state in the tank body 1. In this process, the dissolved air pump 4 water inlet end valve and the gas pipeline 2 valve can be adjusted to adjust the reasonable dissolved water gas ratio, and after the stable dissolved air circulation is formed, the air inlet pipeline 13 is closed, and then the oil-containing wastewater is introduced.

[0028] The oil-containing wastewater enters the tank body 1 through the tangent water inlet pipeline, and the oil droplets in the wastewater quickly combine with the dissolved air water to form large-particle oil droplets. The large-particle oil droplets become light and can accelerate the upward floating speed. At the same time, under the action of centrifugal force, the large-particle oil droplets gather to the tank wall side and float upward, and the separated clean water flows to the lower part of the tank body 1, and in the flowing process, the clean water further combines with the bubbles in the dissolved air zone 103 to separate the waste oil, and reaches the bottom of the tank body 1. The clean water enters the clean water outlet 5.

[0029] The separated waste oil forms a waste oil layer in the upper part of the tank body 1, and under the action of the tank pressure, the waste oil enters the oil collecting barrel 8 and is discharged outside the tank through the oil discharge pipeline 10. The oil discharge pipeline 10 is provided with an electric valve controlled by a PLC controller. When the valve is closed, the tank pressure increases and the oil layer thickness increases, and when the valve is opened, the tank pressure decreases, the oil discharge accelerates, and the oil layer thickness decreases. The oil layer thickness can be confirmed by the oil gas monitor 12 and the oil water monitor 11, and the feedback is given to the PLC controller to control the electric valve to achieve the purpose of reasonable oil discharge.

[0030] The pressure type dissolved air tank 3 and the dissolved air pump 4 are main components for generating dissolved air water, and the whole process of forming the dissolved air flotation is an internal circulation process of the device. The water inlet thereof is a clean water outlet, the gas inlet is air in the part of the pressurization zone 101, and the fused dissolved air water all enters the tank body 1, so the process does not affect the internal pressure change of the equipment.

[0031] It should be noted that, for the safety of equipment and personnel. A mechanical safety valve is arranged on the top of the tank 1, when the pressure control in the tank 1 fails, the safety valve can be automatically opened to release high pressure, thereby protecting the safety of equipment and personnel. During the entire treatment process, the impurities that cannot be discharged through cyclone and air flotation due to their large weight are discharged through the blowdown port 16 at regular intervals.

[0032] The above is a detailed introduction to the oil removal device provided by the utility model, and the technical principles and implementation modes of the utility model are described in this paper by applying specific examples. The above examples are only used to help understand the method and core idea of the utility model; at the same time, for the general technical personnel in the field, according to the idea of the utility model, the specific implementation mode and application range will be changed, and the above is not understood as the limitation of the utility model.

Claims

1. A cyclonic oil removal device, characterised in that: The sealed tank body is provided with, from top to bottom, a pressurization zone, a cyclone separation zone and a dissolved gas zone; The top of the pressurization zone is provided with an air inlet connected with an air inlet pipeline and an air outlet connected with an air outlet pipeline, the other end of the air outlet pipeline being connected with a dissolved gas pump; The cyclone separation zone is provided with a spiral separation plate, the inner side of the spiral separation plate being provided with an oil collecting bucket, the oil collecting bucket being provided with an oil discharge pipeline; the tank body of the cyclone separation zone is provided with liquid inlets distributed along the tangential position of the tank body; The dissolved gas zone is provided with a dissolved gas head, and the bottom of the tank body is provided with a sewage outlet and a clean water outlet; The tank body is provided with an oil gas monitor, an oil water monitor and a pressure sensor.

2. The device according to claim 1, characterized in that: The electric control cabinet and the tank body are both mounted on the mounting bracket; The electric control cabinet comprises a PLC controller.

3. The device according to claim 2, characterized in that: The air inlet pipeline is provided with an electric control valve, and the oil gas monitor, the oil water monitor, the pressure sensor and the electric control valve are all connected with the PLC controller through signal lines.

4. The device according to claim 1 or 2 or 3, characterized in that: The clean water outlet comprises two, one being directly discharged outside the tank body through a pipeline, and the other being connected with a multi-phase dissolved gas system through a pipeline.

5. The device according to claim 4, characterized in that: The upper side of the clean water outlet is provided with a baffle for preventing impurities from entering the clean water pipeline.

6. The device according to claim 4, characterized in that: The multi-phase dissolved gas system comprises a dissolved gas pump and a dissolved gas tank, one end of the dissolved gas tank being connected with the outlet of the dissolved gas pump, and the other end being connected with the dissolved gas head.

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