Multifunctional oil-water enhanced separation integrated device

Abstract

The application relates to a multifunctional oil-water reinforced separation integrated device which comprises a device cylinder, an upper water collecting cavity, an upper oil collecting cavity, a corrugated plate coalescing module, a spiral flow channel, an oil collecting bucket, a cyclone, a gas floating module and a lower oil collecting cavity. The upper water collecting cavity and the upper oil collecting cavity are arranged at the top of the device cylinder and are not communicated with each other, an upper oil outlet is formed on the device cylinder and is communicated with the upper oil collecting cavity, and a cylinder inlet is arranged below the upper oil collecting cavity; the bottom of the upper oil collecting cavity is communicated with the oil collecting bucket; the lower oil collecting cavity is arranged at the bottom of the device cylinder, the gas floating module is arranged on the outer wall of the bottom of the device cylinder in a ring shape; the cyclone is arranged in the oil collecting bucket, one end of the cyclone is communicated with the upper water collecting cavity, the other end is communicated with the lower oil collecting cavity, and an air inlet is formed on the bottom side wall of the cyclone; and the corrugated plate coalescing module and the spiral flow channel are arranged on the oil collecting bucket in a sleeved manner. The device has the characteristics of compact structure, fast separation speed, multiple functions, excellent effect and the like.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of oil-water separation devices, and particularly relates to a multifunctional oil-water enhanced separation integrated device for separating non-miscible oil-water two-phase or other difficult-to-separate media. BACKGROUND

[0002] At present, compact air floatation devices have been widely applied to offshore oil exploration platforms due to their small footprint and high processing efficiency.

[0003] In the prior art, domestic air floatation separation technology is relatively mature, and the separation effect of oil and water is obvious, but there are some problems in separating oil and water or other multi-phase media: for example, the existing air floatation device has a single function, and the combination of air floatation + weak cyclone cannot achieve complete oil-water separation, the separation efficiency is low, and the occupied space is large, and the existing functional integration scheme is also relatively less. The cyclone separator has no moving parts, and has the advantages of simple structure, reliable performance, high separation efficiency, and small footprint, and is particularly suitable for oil-water separation on offshore platforms, but the separation effect for oil droplet particles of 30 μm and below is poor. The corrugated plate coalescence technology can promote the coalescence of oil droplets, although certain effects have been achieved, but it is usually used as an auxiliary means and is generally not used as a separate separation technology. SUMMARY

[0004] In order to solve all or part of the above problems, the present application aims to provide a multifunctional oil-water enhanced separation integrated device to improve the processing effect of processing difficult-to-separate multi-phase media (such as oil and water).

[0005] The present application provides a multifunctional oil-water enhanced separation integrated device, which comprises a device cylinder, an upper water collecting cavity, an upper oil collecting cavity, a corrugated plate coalescence module, a spiral flow channel, an oil collecting bucket, a cyclone, an air floatation module, and a lower oil collecting cavity. Wherein: the upper water collecting cavity and the upper oil collecting cavity are sequentially arranged from top to bottom on the top of the device cylinder and are not connected, an upper oil outlet is formed on the device cylinder and is connected with the upper oil collecting cavity, and a cylinder inlet is located below the upper oil collecting cavity; the bottom of the upper oil collecting cavity is connected with the oil collecting bucket, and the bottom of the oil collecting bucket is formed with an opening; the lower oil collecting cavity is arranged at the bottom of the device cylinder, the air floatation module is arranged on the outer wall of the bottom of the device cylinder, and the device cylinder is further formed with a gas injection port connected with the air floatation module and a lower oil outlet connected with the lower oil collecting cavity; the cyclone is arranged in the oil collecting bucket, one end of the cyclone is connected with the upper water collecting cavity, the other end is connected with the lower oil collecting cavity, and an air inlet is formed on the bottom side wall of the cyclone; the corrugated plate coalescence module and the spiral flow channel are sequentially and spacedly sleeved on the oil collecting bucket from top to bottom.

[0006] In some embodiments, the corrugated plate coalescence module is configured by radially arranging annular corrugated plates with surface corrugations around the central axis of the cylinder.

[0007] In some embodiments, the spiral flow channel is wound on the outside of the oil collection bucket, and the spiral flow channel is configured to have a plurality of spiral surfaces arranged to receive the oil droplets condensed by the corrugated plate condensing module to form a stable spiral flow.

[0008] In some embodiments, the cyclone is coaxially and spacedly arranged with the oil collection bucket, so that an oil phase flow channel is formed between the oil collection bucket and the outer wall of the cyclone, and the oil phase flow channel is in communication with the upper oil collecting cavity.

[0009] In some embodiments, the air flotation module is configured as an annular air storage cavity arranged on the outer wall of the device cylinder, and the air injection port is in communication with the annular air storage cavity.

[0010] In some embodiments, the inner side wall of the annular air storage cavity is configured as the outer wall of the device cylinder, the inner side wall of the annular air storage cavity is formed with a microporous plate, and the air injection port is connected to the outer side wall of the annular air storage cavity.

[0011] In some embodiments, the cyclone comprises a bottom flow pipe, a cyclone small cone section, a second cyclone cone cylinder and a cyclone straight cylinder which are sequentially connected in communication, the bottom flow pipe is in communication with the upper water collecting cavity, the cyclone straight cylinder is in communication with the lower oil collecting cavity, and the cyclone straight cylinder is formed with a tangential inlet.

[0012] In some embodiments, the cyclone is selected from a double-cone liquid-liquid cyclone.

[0013] In some embodiments, the bottom axis position of the cyclone straight cylinder is provided with a cyclone overflow pipe, and the cyclone overflow pipe is in communication with the lower oil collecting cavity.

[0014] According to the above technical solution, the multifunctional oil-water enhanced separation integrated device provided by the application can enhance oil-water separation by increasing the number of separations; each separation module works cooperatively and complements each other, overcoming the shortcomings of each module alone, and realizing the enhanced separation of the oil-water mixture. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 FIG. 1 is a schematic diagram of the overall structure of the multifunctional oil-water enhanced separation integrated device according to an embodiment of the application.

[0016] Figure 2 FIG. 4 is a schematic diagram of the working principle process of the corrugated plate condensing module according to an embodiment of the application.

[0017] Figure 3 FIG. 5 is a schematic diagram of the structure of the spiral flow channel according to an embodiment of the application.

[0018] Figure 4 FIG. 6 is a schematic diagram of the working principle of the air flotation module according to an embodiment of the application.

[0019] Figure 5 This is a schematic diagram of fluid flow in a hydrocyclone according to an embodiment of the present invention.

[0020] Figure 6 This is a schematic diagram illustrating the working principle of the multifunctional oil-water enhanced separation integrated device according to an embodiment of the present invention. Detailed Implementation

[0021] To better understand the purpose, structure, and function of this invention, a multifunctional integrated oil-water enhanced separation device of this invention will be described in further detail below with reference to the accompanying drawings.

[0022] Figure 1 A schematic diagram of a multifunctional integrated oil-water enhanced separation device according to an embodiment of the present invention is shown. Figure 1 As shown, the multifunctional integrated oil-water enhanced separation device includes a device cylinder, an upper water collection chamber (14), an upper oil collection chamber (9), a corrugated plate coalescing module (2), a spiral flow channel (3), an oil collection tank (8), a hydrocyclone (4), an air flotation module (11), and a lower oil collection chamber (12). Specifically: the upper water collection chamber (14) and the upper oil collection chamber (9) are arranged sequentially from top to bottom at the top of the device cylinder and are not connected. The device cylinder has an upper oil outlet (10) connected to the upper oil collection chamber (9) and a cylinder inlet (1) located below the upper oil collection chamber (9); the bottom of the upper oil collection chamber (9) is connected to the oil collection tank (8), and the bottom of the oil collection tank (8) has an opening; the lower oil collection chamber (12) is located at the bottom of the device cylinder, and the air flotation module (11) is arranged circumferentially at the bottom of the device cylinder. On the outer wall of the device cylinder, there are air inlet (6) connected to the air flotation module (11) and lower oil outlet (13) connected to the lower oil collection chamber (12); the hydrocyclone (4) is installed in the oil collection tank (8), one end of the hydrocyclone (4) is connected to the upper water collection chamber (14), and the other end is connected to the lower oil collection chamber (12), and an air inlet is formed on the bottom side wall of the hydrocyclone (4); the corrugated plate coalescing module (2) and the spiral flow channel (3) are sequentially and alternately fitted on the oil collection tank (8) from top to bottom.

[0023] Please refer to Figure 2 In some embodiments, the corrugated plate coalescing module (2) is constructed as annular corrugated plates with corrugated surfaces arranged radially around the central axis of the cylinder.

[0024] Furthermore, the corrugated plate coalescing module (2) is composed of annular corrugated plates with corrugated surfaces arranged radially around the central axis of the cylinder. When small oil droplets in the mixture to be separated pass through the corrugated plates, they will wet and coalesce to form large oil droplets, as shown in the following figure. Figure 2 As shown.

[0025] Please refer to Figure 1 and Figure 3In some embodiments, the spiral flow channel (3) is wound on the outside of the oil collection bucket (8), and the spiral flow channel (3) is configured to have a plurality of spiral surfaces arranged to receive the oil droplets condensed by the corrugated plate condensation module (2) to form a stable spiral flow.

[0026] Further, the spiral flow channel (3) is wound on the outside of the oil collection bucket (8), and specifically as shown in Figure 3 After the oil droplets pass through the corrugated plate condensation module (2), they quickly form a stable spiral flow through the spiral flow channel (3), and the oil-rich phase is collected in the center and then enters the oil collection bucket (8) to complete the first separation.

[0027] Please refer to Figure 1 In some embodiments, the cyclone (4) is coaxially and spacedly arranged with the oil collection bucket (8) to form an oil phase flow channel between the oil collection bucket (8) and the outer wall of the cyclone (4), and the oil phase flow channel is in communication with the upper oil collection cavity (9).

[0028] Please refer to Figure 1 and Figure 4 In some embodiments, the air floatation module (11) is configured as an annular gas storage cavity (5) arranged on the outer wall of the device cylinder, and the gas injection port (6) is in communication with the annular gas storage cavity (5).

[0029] Please refer to Figure 1 and Figure 4 In some embodiments, the inner side wall of the annular gas storage cavity (5) is configured as the outer wall of the device cylinder, and the inner side wall of the annular gas storage cavity (5) is formed with a microporous plate (7), and the gas injection port (6) is connected to the outer side wall of the annular gas storage cavity (5).

[0030] Further, the air floatation module (11) is located at the bottom of the cylinder, compressed air enters the annular gas storage cavity (5) through the gas injection port (6), and then generates micro-bubbles through the microporous plate (7). The micro-bubbles collide and adhere to the small oil droplets, and specifically as shown in Figure 4 During the process, the small oil droplets are collected in the center, and then the oil-rich phase is collected by the oil collection bucket (8).

[0031] Please refer to Figure 5 In some embodiments, the cyclone (4) includes a bottom flow pipe (404), a cyclone small cone section (403), a second cyclone cone cylinder, and a cyclone straight cylinder which are sequentially connected in communication, the bottom flow pipe is in communication with the upper water collection cavity (14), the cyclone straight cylinder is in communication with the lower oil collection cavity (12), and the cyclone straight cylinder is formed with a tangential inlet (401).

[0032] In some embodiments, the cyclone (4) is selected from a double-cone liquid-liquid cyclone.

[0033] Please refer to Figure 1 and Figure 5In some embodiments, the bottom axis position of the straight cylinder of the cyclone is provided with a cyclone overflow pipe (402) which is connected with the lower oil collection cavity (12).

[0034] Further, the cyclone (4) is inverted in the center of the cylinder, and the central axis is coincident with the central axis of the cylinder. The first unseparated mixed liquid containing a small amount of oil phase is treated by the coalescence module (11) to increase the oil nuclei of small oil droplets, so as to prepare for the deep separation of the cyclone (4). The liquid enters the cyclone (4) from the two tangential inlets (401) of the cyclone (4) at a certain speed to generate high-speed rotation. The oil phase and the water phase with different densities and incompatible with each other are different in the received centrifugal force. The water-rich phase is gathered at the outer wall of the cyclone (4) and finally flows out from the underflow pipe (404). The oil-rich phase is gathered near the central axis of the cyclone (4) and finally flows out from the overflow port (402).

[0035] In combination with the above settings, in a multifunctional oil-water enhanced separation integrated device according to an embodiment of the application, the functions of each structure are as follows:

[0036] The upper water collection cavity (14) is used to buffer the water phase from the underflow pipe (404) of the cyclone (4), and then the water phase flows out from the top water outlet (15). The outlet can be connected through a flange and a water conveying pipeline.

[0037] The upper oil collection cavity (9) can store the oil-rich phase collected by the oil collection bucket (8). The left side of the upper oil collection cavity (9) has an upper oil outlet (10), and the outlet can be connected through a flange and an oil conveying pipeline to convey the oil-rich phase separated preliminarily.

[0038] The corrugated plate coalescence module (2) can coalesce small oil droplets in the mixed liquid to be separated, so as to promote the growth of the oil nuclei and prepare for the first separation.

[0039] The spiral flow channel (3) is wound outside the oil collection bucket (8), and its function is to promote the liquid treated by the corrugated coalescence plate to form stable cyclone quickly.

[0040] The central axis of the oil collection bucket (8) is coincident with the cylinder, and the oil phase is gathered in the center and collected by the oil collection bucket (8).

[0041] The air flotation module (11) is located at the bottom of the cylinder. Compressed air enters the annular air storage cavity (5) through the air injection port (6), and then generates micro-bubbles through the micron pore plate (7). The micro-bubbles collide and adhere to the small oil droplets, so as to promote the small oil droplets to gather in the center.

[0042] The lower oil collection cavity (12) of the vertical cylinder is used to buffer the oil phase from the cyclone overflow pipe (402), and the left side of the lower oil collection cavity (12) has a lower oil outlet (13).

[0043] In summary, the multifunctional oil-water enhanced separation integrated device according to the embodiment of the application can be divided into five modules, which are, in sequence from upstream to downstream along the fluid flow, a corrugated plate coalescence module (2), a spiral flow guide module, a stable flow oil collection module, a gas flotation module (11) and a cyclone separation module. Specifically,

[0044] The corrugated plate coalescence module (2) is mainly composed of a spiral flow channel (3). The liquid enters the corrugated plate coalescence module (2) at a certain speed, and then the small oil droplets in the mixed liquid are increased in size through the wetting coalescence effect of the corrugated plate.

[0045] The spiral flow guide module is mainly composed of a spiral flow channel (3). The mixed liquid treated by the corrugated plate coalescence module (2) enters the spiral flow channel (3). The special spiral structure of the spiral flow channel (3) can guide the mixed liquid to quickly form a cyclone, thereby preparing for the first oil-water separation.

[0046] The stable flow oil collection module is composed of a small cone section (403) of a cyclone and an oil collection bucket (8). The small cone section (403) of the cyclone is in the center of the vertical cylinder, which can avoid the movement of micro-bubbles to the center to form an oil core that causes excessive disturbance to the central oil phase. Then, the oil phase medium is separated from the water phase due to the lower density than the water phase and is collected by the oil collection bucket (8).

[0047] The gas flotation module (11) is mainly composed of an annular gas storage cavity (5). Compressed air enters the annular gas storage cavity (5) through the air injection port (6), and then 20-40 μm micro-bubbles are formed through micropores. The micro-bubbles are generated from the micropores near the inner wall of the annular gas storage cavity (5), and the micro-bubble axis then moves upward. Through this setting, first, the oil phase will accelerate to the center after being subjected to the buoyancy; second, the oil droplets that cannot be coalesced to the center due to insufficient particle size will collide and adhere together, thereby increasing the particle size and continuing to gather to the center under sufficient centripetal force, thereby avoiding the escape of these oil droplets from the periphery downward; third, the 20-40 μm micro-bubbles promote the collision of emulsified oil particles under the condition of small disturbance to large oil droplets, so as to break the oil droplet interface film and promote the coalescence of these oil droplets to the central oil phase.

[0048] The cyclone separation module is mainly composed of a cyclone (4), which has a poor effect on separating oil droplets below 30 μm. After the above two coalescences, the oil droplets are coarsened to a discrete phase diameter that can be separated by the cyclone (4). The liquid enters the inside of the cyclone (4) from two tangential inlets (401). Due to the different densities and mutual insolubility, the oil phase and the water phase are separated, and the oil phase is gathered to the middle from the overflow pipe (402) of the cyclone to flow into the lower oil collection cavity (12) of the vertical cylinder, and then is transported out from the oil conveying pipe connected with the lower oil outlet (13).

[0049] The water phase is distributed around the cyclone (4) and finally flows out from the underflow pipe (404) of the cyclone (4) to the upper water collecting cavity (14), and then is output from the top water outlet (15).

[0050] Through the above setting, the specific working principle can be combined with the description of the drawings Figure 6 As shown in the drawings, the internal oil-water enhanced separation process of the multifunctional oil-water enhanced separation integrated device of the embodiment of the application can be divided into two stages, the I-stage separator includes a corrugated plate coalescence module (2), a spiral flow guide module, a steady flow oil collection module and a gas flotation module (11); the II-stage separator includes the gas flotation module (11) and a cyclone separation module.

[0051] The oil-water mixture enters the I-stage separator from the tangential inlet, first enters the corrugated plate coalescence module (2), and the device coalesces the small oil droplets that are difficult to separate in the weak cyclone formed by the spiral flow channel (3). The spiral flow channel (3) is one of the core components of the I-stage separator, and has the following functions: 1) accelerating the fluid and improving the separation efficiency; 2) the oil-water two phases are preliminarily separated in the flow channel. After passing through the spiral flow channel (3), the fluid is in spiral motion, and under the action of centrifugal force, the dispersed phase oil droplets with smaller density move spirally to the center of the cyclone chamber. The steady flow oil collection module is mainly composed of a cyclone small cone section (403) and an oil collection bucket (8), the cyclone small cone section (403) can prevent micro-bubbles from entering the center to form an air column to interfere with oil aggregation when the to-be-separated liquid spirally flows, and the oil collection bucket (8) collects the oil phase aggregated to the center to the upper oil collecting cavity (9), so as to realize the preliminary separation of the oil-water two phases. The gas flotation module (11) has two functions: 1) the generated micro-gas and oil droplets float axially upward to promote the first separation of the oil droplets; 2) the micro-bubbles and oil droplets collide and adhere to increase the particle size of the oil droplets, and prepare for deep separation into the cyclone separation module.

[0052] Under the double coalescence effects of the gas flotation module and the coalescence module, the mixed liquid then enters the main component of the II-stage separator, the cyclone (4), for deep separation, the oil-water two phases that are not mutually soluble and different in density rotate at high speed in the cyclone (4) and are layered, the oil-rich phase is aggregated in the center and then flows out from the overflow pipe (402), the water-rich phase that almost does not contain oil is aggregated on the wall surface of the cone section of the cyclone and then flows out from the underflow pipe (404), and the oil-water separation effect is greatly improved.

[0053] Through the twice coalescence and cyclone separation completed above, the separation of the difficult-to-separate emulsified oil solution can be realized, the separation efficiency is further improved, and the overall separation efficiency of the separation device is improved.

[0054] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the present application should be the usual meanings understood by the skilled person in the field of the application.

[0055] In the description of the application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of facilitating the description of the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the application.

[0056] In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the application, the meaning of "a plurality of" is more than two, unless otherwise explicitly and specifically limited.

[0057] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. Especially, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A multifunctional oil-water enhanced separation integrated device, characterized in that, The device includes a device cylinder, an upper water collecting cavity (14), an upper oil collecting cavity (9), a corrugated plate coalescing module (2), a spiral flow channel (3), an oil collecting bucket (8), a cyclone (4), a gas float module (11), and a lower oil collecting cavity (12). The upper water collecting cavity (14) and the upper oil collecting cavity (9) are sequentially arranged on the top of the device cylinder from top to bottom and are not communicated with each other, and the device cylinder is formed with an upper oil outlet (10) communicated with the upper oil collecting cavity (9) and a cylinder inlet (1) located below the upper oil collecting cavity (9). The bottom of the upper oil collecting cavity (9) is communicated with the oil collecting bucket (8), and the bottom of the oil collecting bucket (8) is formed with an opening. The lower oil collecting cavity (12) is arranged at the bottom of the device cylinder, the gas float module (11) is arranged on the outer wall of the bottom of the device cylinder, and the device cylinder is further formed with a gas injection port (6) communicated with the gas float module (11) and a lower oil outlet (13) communicated with the lower oil collecting cavity (12). The cyclone (4) is arranged in the oil collecting bucket (8), one end of the cyclone (4) is communicated with the upper water collecting cavity (14), the other end is communicated with the lower oil collecting cavity (12), and the bottom side wall of the cyclone (4) is formed with an air inlet. The corrugated plate coalescing module (2) and the spiral flow channel (3) are sequentially and spacedly arranged on the oil collecting bucket (8) from top to bottom. The gas float module (11) is configured as a ring-shaped gas storage cavity (5) arranged on the outer wall of the device cylinder, and the gas injection port (6) is communicated with the ring-shaped gas storage cavity (5). The inner side wall of the ring-shaped gas storage cavity (5) is configured as the outer wall of the device cylinder, the inner side wall of the ring-shaped gas storage cavity (5) is formed with a microporous plate (7), and the gas injection port (6) is communicated with the outer side wall of the ring-shaped gas storage cavity (5). The cyclone (4) includes a bottom flow pipe (404), a cyclone small cone section (403), a second cyclone cone cylinder, and a cyclone straight cylinder which are sequentially communicated, the bottom flow pipe is communicated with the upper water collecting cavity (14), the cyclone straight cylinder is communicated with the lower oil collecting cavity (12), and the cyclone straight cylinder is formed with a tangential inlet (401).

2. The multifunctional oil-water enhanced separation integrated device according to claim 1, characterized in that, The corrugated plate coalescing module (2) is configured as a surface corrugated ring-shaped corrugated plate arranged radially along the central axis of the cylinder.

3. The multifunctional oil-water enhanced separation integrated device according to claim 1, characterized in that, The spiral flow channel (3) is wound on the outer side of the oil collecting bucket (8), and the spiral flow channel (3) is configured to have a plurality of spiral surfaces arranged to receive oil droplets coalesced by the corrugated plate coalescing module (2) to form stable cyclone flow.

4. The multifunctional oil-water enhanced separation integrated device according to claim 3, characterized in that, The cyclone (4) is coaxial with and spaced from the oil collecting bucket (8) to form an oil phase flow channel between the oil collecting bucket (8) and the outer wall of the cyclone (4), and the oil phase flow channel is communicated with the upper oil collecting cavity (9).

5. The multifunctional oil-water enhanced separation integrated device according to claim 1, characterized in that, The cyclone (4) is selected from a double-cone liquid-liquid cyclone.

6. The multifunctional oil-water enhanced separation integrated device according to claim 1 or 5, characterized in that, The bottom axis position of the straight cylinder body of the cyclone is provided with a cyclone overflow pipe (402) which is communicated with the lower oil collecting cavity (12).

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