Skid-mounted air floatation rotational flow oily sewage treatment device

Abstract

The utility model relates to the technical field of oily sewage treatment, in particular to a skid-mounted air flotation rotational flow oily sewage treatment device which comprises a rack, a buffer skimming tank, a flotation rotational flow tank and a vapor-liquid mixing pump are mounted on the rack in a skid-mounted mode, and the buffer skimming tank is communicated with the flotation rotational flow tank through the vapor-liquid mixing pump. The flotation rotational flow tank comprises a cone structure composed of a cone outer wall and a cone inner wall, a rotational flow partition plate is connected between the cone outer wall and the cone inner wall to form a dissolved air and oily sewage mixed rotating area, and a liquid overflowing channel is formed among the cone outer wall, the cone inner wall and the rotational flow partition plate from top to bottom. The oil-water separator has the advantages of small bubble particles, long retention time and obvious separation effect, the treatment capacity of oil and suspended matters in water is not reduced to 95%, rotational flow can be realized to reach a 25G separation factor, and meanwhile, the retention time of microbubbles in oil-containing sewage and the mixing degree of the microbubbles and emulsified oil are increased, so that the oil-water separation efficiency is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of oily wastewater treatment technology, specifically a skid-mounted air flotation cyclone oily wastewater treatment device. Background Technology

[0002] Oily wastewater treatment devices are widely used in oily wastewater from the petroleum, petrochemical, chemical, and food industries, as well as in wastewater containing suspended solids from the printing and dyeing and papermaking industries. Existing oil-water separation devices in oil fields include inclined plate skimmers, aerated flotation, and walnut shell filters, which occupy a large area, require large investments, and have high daily treatment and maintenance costs. Therefore, a skid-mounted aerated flotation cyclone oily wastewater treatment device is designed that is compact in structure, highly efficient, produces small bubble particles, has a long residence time, achieves significant separation effect, is simple to operate, runs stably, reliably, safely, and without clogging. It has a wide range of applications, low energy consumption, low investment, large treatment capacity, low requirements for the specific oil content in the water, and can treat no less than 95% of the oil and suspended solids in the water. Utility Model Content

[0003] (a) Technical problems to be solved

[0004] To address the shortcomings of existing technologies, this utility model provides a skid-mounted air flotation cyclone oily wastewater treatment device. It features a compact structure, high efficiency, small bubble particles, long residence time, significant separation effect, simple operation, stable, reliable, safe, and non-clogging operation. It has a wide range of applications, low energy consumption, low investment, large treatment capacity, low requirements for the oil content in water, and can treat no less than 95% of the oil and suspended solids in water.

[0005] (II) Technical Solution

[0006] To achieve the above objectives, this utility model provides the following technical solution: a skid-mounted air flotation cyclone oily wastewater treatment device, comprising a frame, on which a buffer skimmer, a flotation cyclone tank, and a gas-liquid mixing pump are skid-mounted. The buffer skimmer and the flotation cyclone tank are connected via the gas-liquid mixing pump. The flotation cyclone tank includes a conical structure composed of an outer conical outer wall and an inner conical inner wall. A cyclone baffle is provided between the outer and inner conical outer walls to form a mixing and rotating zone for dissolved gas and oily wastewater. A liquid flow channel is formed from top to bottom between the outer and inner conical outer walls and the cyclone baffle. The liquid flow channel is vertically connected and has an inlet and an outlet respectively at the top and bottom. The inlet is connected to the gas-liquid mixing pump.

[0007] Preferably, it also includes a filter, the output of which is connected to the input of the buffer skimming tank.

[0008] Preferably, it also includes a controller, and the buffer skimming tank, flotation cyclone tank and gas-liquid mixing pump are all electrically connected to the controller.

[0009] Preferably, it also includes a reflux device, which is connected between the buffer skimming tank and the flotation cyclone tank.

[0010] Preferably, both the buffer skimming tank and the flotation cyclone tank are equipped with inspection covers at their middle positions.

[0011] (III) Beneficial Effects

[0012] Compared with the prior art, this utility model provides a skid-mounted air flotation cyclone oily wastewater treatment device, which has the following beneficial effects:

[0013] This skid-mounted air flotation cyclone oily wastewater treatment device first enters a buffer skimming tank, where the oil and water undergo preliminary separation. The floating oil on top is collected after skimming and returned to the next stage oil-water separator. The oily and scum wastewater in the buffer skimming tank is then pumped into a flotation cyclone tank via a gas-liquid mixing pump. Microbubbles with a diameter of approximately 5 micrometers are generated in the gas-liquid mixing pump and thoroughly mixed with the oily wastewater. The gas can be nitrogen or air, depending on the site conditions. The microbubbles and the oil-water emulsions in the oily wastewater, acting as suspended solids, mutually adsorb each other, thereby changing the density of the microparticles and emulsion particles. Through the flotation cyclone tank, the oily wastewater rotates at a high angular velocity. The lighter emulsion oil particles and suspended particles that have adsorbed the microbubbles concentrate towards the center of the cyclone and then float to the top, while the water sinks. The oil and suspended solids content in the water will be reduced to a standard that allows for direct discharge. Due to the back pressure set in the flotation cyclone tank, the residence time of microbubbles in oily wastewater will be extended to eight to ten minutes, thereby improving the efficiency and separation effect of the air flotation cyclone. This skid-mounted air flotation cyclone oily wastewater treatment device has a compact structure, high efficiency, small bubble particles, long residence time, significant separation effect, simple operation, stable, reliable, safe, and non-clogging operation. It has a wide range of applications, low energy consumption, low investment, and large processing capacity. It has low requirements for the specific gravity of oil in the water and can reduce the amount of oil and suspended solids in the water to no less than 95%. It can achieve a separation factor of 25G through cyclone, while increasing the residence time of microbubbles in oily wastewater and the mixing degree of microbubbles and emulsified oil, thereby effectively improving the oil-water separation efficiency. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a structural schematic diagram of the present invention from other perspectives;

[0016] Figure 3 This is a structural schematic diagram of the present invention from another perspective;

[0017] Figure 4 This is a cross-sectional planar structural diagram of the external wall of the vertebral column, the internal wall of the vertebral column, and the swirl baffle of this utility model.

[0018] The following are labeled in the attached diagram: 1. Frame; 2. Buffer skimming tank; 3. Flotation cyclone tank; 4. Gas-liquid mixing pump; 5. Filter; 6. Controller; 7. Outer wall of the cone; 8. Inner wall of the cone; 9. Cyclone baffle; 10. Mixing and rotating zone for dissolved gas and oily wastewater; 11. Inlet; 12. Outlet; 13. Inspection cover. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Example:

[0021] Please see Figure 1-4 A skid-mounted air flotation cyclone oily wastewater treatment device includes a frame 1, on which a buffer skimmer 2, a flotation cyclone tank 3, and a gas-liquid mixing pump 4 are skid-mounted. The buffer skimmer 2 and the flotation cyclone tank 3 are connected by the gas-liquid mixing pump 4. The flotation cyclone tank 3 includes a conical structure composed of an outer conical outer wall 7 and an inner conical inner wall 8. A cyclone baffle 9 is fixedly connected between the outer conical outer wall 7 and the inner conical inner wall 8 to form a rotating zone 10 for mixing dissolved air and oily wastewater. A liquid flow channel is formed from top to bottom between the outer conical outer wall 7, the inner conical inner wall 8, and the cyclone baffle 9. The flow channel is vertically connected and has an inlet 11 and an outlet 12 at the top and bottom, respectively. The inlet 11 is connected to the vapor-liquid mixing pump 4. Furthermore, the buffer skimming tank 2 is equipped with back pressure. In the flow channel, dissolved gas water and oily wastewater will be fully mixed and flow through from top to bottom in a swirling motion. During this process, as the rotation speed increases, the centrifugal force or separation factor increases. Finally, the oily wastewater in the liquid coming out of the outlet is attached to microbubbles and rises rapidly in the outer cavity of the cone structure in the flotation cyclone tank 3, thus achieving oil-water separation.

[0022] Specifically, it also includes filter 5, the output end of which is connected to the input end of buffer skimming tank 2. The filter 5 facilitates the pre-filtration of larger impurities in the oily wastewater before it enters buffer skimming tank 2.

[0023] Specifically, it also includes controller 6, buffer skimming tank 2, flotation cyclone tank 3 and vapor-liquid mixing pump 4 are all electrically connected to controller 6, through which the opening and closing of buffer skimming tank 2, flotation cyclone tank 3 and vapor-liquid mixing pump 4 and the operating parameters can be easily controlled.

[0024] Specifically, it also includes a reflux device, which is connected between the buffer skimming tank 2 and the flotation cyclone tank 3. By setting up the reflux device, when the incoming flow rate is unstable (less than the design flow rate), the liquid level of the buffer skimming tank 2 and the flotation cyclone tank 3 is still maintained. Due to the longer residence time, the treatment effect will be further improved.

[0025] Specifically, both the buffer skimming tank 2 and the flotation cyclone tank 3 are equipped with inspection covers 13 at the middle position. The inspection covers 13 facilitate the inspection and maintenance of the interior of the buffer skimming tank 2 and the flotation cyclone tank 3.

[0026] In operation, oily wastewater first enters a buffer skimming tank, where initial separation of oil and water is achieved. The floating oil on the upper layer is collected by skimming and returned to the next stage oil-water separator. The oily and scum wastewater in the buffer skimming tank is pumped into a flotation cyclone tank by a gas-liquid mixing pump. Microbubbles with a diameter of about 5 micrometers are generated in the gas-liquid mixing pump and are fully mixed with the oily wastewater. The gas can be nitrogen or air, depending on the site conditions. The microbubbles and the oil-water emulsions in the oily wastewater, as suspended solids, will adsorb each other, thereby changing the density of micro-particles and emulsion particles. Through the flotation cyclone tank, the oily wastewater rotates at a high angular velocity. The lighter emulsion oil particles and suspended particles that have adsorbed the microbubbles will concentrate towards the center of the cyclone and then float to the top, while the water will sink. The oil and suspended solids in the water will be reduced to the standard that can be directly discharged.

[0027] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., mentioned in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0028] It should be readily understood that the terms “on,” “above,” and “on top of” in this disclosure should be interpreted in the broadest possible sense, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on top of something” but also “on top of something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0029] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90 degrees or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A skid-mounted air flotation cyclonic oily wastewater treatment device, characterized in that: The device comprises a rack (1) on which a buffer oil skimming tank (2), a floatation cyclone tank (3) and a gas-liquid mixing pump (4) are installed, the buffer oil skimming tank (2) and the floatation cyclone tank (3) are communicated through the gas-liquid mixing pump (4), the floatation cyclone tank (3) comprises a cone structure composed of a cone outer wall (7) and a cone inner wall (8), a dissolved gas and oil-containing sewage mixing rotation area (10) is formed between the cone outer wall (7) and the cone inner wall (8) through a cyclone partition plate (9), a liquid overflow channel is formed between the cone outer wall (7), the cone inner wall (8) and the cyclone partition plate (9) from top to bottom, the liquid overflow channel is through from top to bottom and is respectively provided with a liquid inlet (11) and a liquid outlet (12) at the top and the bottom, and the liquid inlet (11) is communicated with the gas-liquid mixing pump (4).

2. The skid-mounted air flotation hydrocyclone oily wastewater treatment device according to claim 1, characterized in that: The device further comprises a filter (5), an output end of the filter (5) is communicated with an input end of the buffer oil skimming tank (2).

3. The skid-mounted air flotation hydrocyclone oily wastewater treatment device according to claim 2, characterized in that: The device further comprises a controller (6), the buffer oil skimming tank (2), the floatation cyclone tank (3) and the gas-liquid mixing pump (4) are electrically connected with the controller (6).

4. The skid-mounted air flotation hydrocyclone oily wastewater treatment device according to claim 3, characterized in that: The device further comprises a reflux device, the reflux device is communicated between the buffer oil skimming tank (2) and the floatation cyclone tank (3).

5. The skid-mounted air flotation hydrocyclone oily wastewater treatment device according to claim 4, characterized in that: Maintenance covers (13) are installed at middle positions of the buffer oil skimming tank (2) and the floatation cyclone tank (3).

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