Method and device for dewatering by built-in fiber-induced coalescence enhanced cyclone

Abstract

The application discloses a method and device for built-in fiber-induced coalescence enhanced cyclone dehydration, the method is as follows: oil-water mixture enters the cyclone along the axial direction, and is separated by cyclone under the action of centrifugal force, water droplets migrate to the edge wall of the cyclone and flow out from the water phase outlet, and the oil phase flows out from the oil phase outlet; the hydrophilic fiber bundle arranged in the form of an inverted cone fan is arranged in the cyclone, the hydrophilic fiber captures small water droplets in the inner cyclone position due to small particle size by means of polarity, on the one hand, the coalescence of the hydrophilic fiber promotes the coalescence of small water droplets into large water droplets, and the large water droplets migrate to the edge wall under the action of centrifugal force; on the other hand, the hydrophilic fiber induces small water droplets to migrate to the edge wall under the action of water flow drag force by means of the flow guiding effect of the hydrophilic fiber. The method and device have stable separation effect and compact structure, and can strengthen the oil-water cyclone separation process and improve the oil-water separation efficiency and precision.

Description

Technical Field

[0001] This invention belongs to the technical field of oil-water separation in petrochemical and environmental protection. Specifically, it relates to a method and apparatus for induced polymerization and enhanced cyclone dehydration using built-in fibers. Background Technology

[0002] As a mature heterogeneous separation device, cyclone separation technology equipment can achieve rapid separation of oil and water phases due to its advantages such as small size, light weight, high separation efficiency, simple structure and easy maintenance. It is widely used for the pre-separation of oil and water phases.

[0003] Oil-water hydrocyclones can be classified into oil-removing hydrocyclones and dehydrating hydrocyclones based on the oil content of the treated liquid. Currently, there is more research on oil-removing hydrocyclones, while research on dehydrating hydrocyclones is less common. Traditional dehydrating hydrocyclones are structurally similar to solid-liquid hydrocyclones, including a swirling chamber, a large cone section, and a small cone section. They often employ dual tangential inlets, but suffer from significant pressure loss, and the large amount of oil nuclei formed and discharged from the underflow outlet leads to unsatisfactory separation results.

[0004] Axial flow hydrocyclones employ axial feeding, relying on swirling blades to initiate the swirl. These blades ensure uniform fluid flow and effectively prevent eccentricity. Related research indicates that axial flow hydrocyclones can create a more stable internal flow field, reducing turbulence and offering advantages such as compact structure, low pressure, high throughput, and high separation efficiency. However, oil dehydration hydrocyclones exhibit a wide range of dispersed phase concentrations, reaching 30% or even higher, and these concentrations are prone to variation under actual operating conditions. Therefore, the impact of dispersed phase concentration variations should be fully considered when designing oil dehydration hydrocyclones.

[0005] For oil-water mixtures with low dispersed phase concentrations, such as below 1%, the water droplet size exhibits a multi-scale distribution; the smaller the droplet size, the more difficult the oil-water separation. Furthermore, in dehydration-type hydrocyclones, the high viscosity of the continuous phase leads to significant frictional resistance during the migration of the dispersed phase, resulting in increased droplet breakage due to shearing. Moreover, since water droplets have lower surface tension than oil droplets, water droplets containing water as the dispersed phase in oil are more easily broken and separated than oil droplets containing oil as the dispersed phase in water. At optimal oil-water separation efficiency, the internal Reynolds number of a dehydration-type hydrocyclone is much lower than that of an oil-removal-type hydrocyclone. This means that the centrifugal force experienced by the dispersed phase droplets in a dehydration-type hydrocyclone is much less than that in an oil-removal-type hydrocyclone, which limits the water separation efficiency of the dehydration-type hydrocyclone. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a method and apparatus for enhanced cyclone dehydration by incorporating built-in fibers to induce polymerization. This method organically combines media coalescence technology with cyclone separation technology. Utilizing the coalescence and guiding effect of hydrophilic fibers arranged in an inverted conical fan shape, small water droplets within the cyclone field are captured and coalesced by the hydrophilic fibers under polar action, thus enhancing cyclone separation and effectively improving the efficiency and accuracy of oil-water separation at low dispersed phase concentrations. Furthermore, by coupling several stages of flow channels, the oil-water separation efficiency is improved through a step-by-step, staged approach. Its design is adaptable to applications with large variations in dispersed phase concentration.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] A method for induced polymerization and enhanced cyclone dehydration using built-in fibers, the method being as follows:

[0009] The oil-water mixture enters the hydrocyclone axially. The hydrocyclone includes several sequentially connected fiber cyclone sections. Under the guiding action of the swirling blades in the fiber cyclone sections, the mixture obtains appropriate tangential and axial velocities. Under the action of centrifugal force, larger water droplets migrate to the sidewall of the hydrocyclone and flow out from the water phase outlet of the sidewall. After dehydration and separation, the oil-water mixture flows out from the oil phase outlet at the top of the axial direction, or continues to enter the next fiber cyclone section axially, achieving further separation of the oil-water mixture.

[0010] Each stage of the fiber swirl section is equipped with hydrophilic fiber bundles arranged in an inverted conical fan shape. The apex of each hydrophilic fiber bundle is positioned above the initiating blade, and the bottom surface of the bundle is located above the apex. These bundles can be arranged at any cross-section of the hydrocyclone as needed. The hydrophilic fibers in the bundles can capture small water droplets in the inner swirl section due to their small size by means of polarity. On the one hand, the aggregation effect of the hydrophilic fibers promotes the coalescence of small water droplets attached to the fibers into larger droplets, which then migrate towards the sidewall under centrifugal force. On the other hand, the guiding effect of the hydrophilic fibers induces the small water droplets to migrate towards the sidewall under the drag force of the water flow. The swirl dehydration is enhanced by inducing coalescence through the built-in fibers.

[0011] Among them, the average particle size of large water droplets in the oil-water mixture is above 100 micrometers; the average particle size of small water droplets is 20-100 micrometers.

[0012] The present invention is further configured such that the oil-water mixture is a mixture with oil as the main phase and water as the dispersed phase, wherein the concentration of the dispersed phase ranges from 0.1% to 30%.

[0013] The present invention is further configured such that the hydrophilic fiber bundles arranged in an inverted conical fan shape are arranged in a multi-layer structure, the apex positions of each layer of hydrophilic fiber bundles are the same or different, and the bottom surface is located at different cross-sections within the fiber swirl section, preferably located below the water outlet on the side wall of the fiber swirl section.

[0014] The present invention is further configured such that the hydrophilic fiber bundle has no less than 2 layers, each layer has no less than 12 hydrophilic fibers, which are evenly distributed along the circumference, and the diameter of the hydrophilic fibers is no greater than 200 micrometers, preferably 20 to 50 micrometers.

[0015] The present invention is further configured such that the hydrophilic fiber is selected from, but not limited to, natural fibers such as cotton, linen, and silk, and hydrophilic modified polyester, nylon, and spandex fibers.

[0016] The invention is further configured such that the helical inclination angle of the swirling blade gradually increases, and the helical inclination angle α at the blade outlet is 55° to 65°. The swirling blade adopts a design of smooth connection of circular arc segments with variable helical inclination angle to form a gradual transition flow channel, so that the mixed liquid enters the hydrocyclone and first undergoes a steady flow in the flow channel before changing the flow direction.

[0017] A second aspect of the present invention provides a device for enhanced cyclone dewatering with built-in fiber-induced polymerization, wherein the enhanced cyclone dewatering device is a cyclone core tube structure comprising a plurality of fiber cyclone sections connected in sequence, wherein the fiber cyclone section includes a cyclone section and a separation section connected from bottom to top, wherein:

[0018] The swirl section is a columnar structure with a liquid inlet at the bottom and a swirl-inducing device inside. A top-end fixing device is provided above the swirl-inducing device.

[0019] The separation section includes a tapered section from bottom to top and an outer cylinder disposed outside the tapered section. The bottom end of the tapered section is connected to the top end of the swirl section, and the top end is provided with an oil phase outlet, or is connected to the swirl section of the previous fiber swirl section. The outer wall of the outer cylinder is provided with a water phase outlet. The side wall of the tapered section is provided with multiple water outlets. The inner wall of the tapered section is provided with several layers of bottom surface fixers. Several hydrophilic fibers are connected between the bottom surface fixers and the top surface fixers. The fiber bundles formed by the hydrophilic fibers are arranged in several layers of inverted conical fan-shaped surfaces.

[0020] The present invention is further configured such that the enhanced cyclone dewatering device includes 1 to 5 stages of fiber cyclone sections, preferably 2 to 3 stages.

[0021] The invention is further configured such that the hydrophilic fiber bundles arranged in an inverted conical fan shape are arranged in several layers, the apex of each layer of hydrophilic fiber bundle is fixed by the top fixer, and the apex positions of each layer of hydrophilic fiber bundle may be the same or different; the bottom surface of each layer of hydrophilic fiber bundle is fixed by the bottom surface fixer and is located at different cross-sections of the tapered section, preferably below the outlet of the tapered section.

[0022] The present invention is further configured such that the number of layers of the hydrophilic fiber bundle is not less than 2, preferably 2 to 8, the number of hydrophilic fibers in each layer is not less than 12, and the diameter of the hydrophilic fibers is not greater than 200 micrometers, preferably 20 to 50 micrometers.

[0023] The present invention is further configured such that the top and bottom fixing devices are not limited to a single shape and structure, including but not limited to fiber traction devices with perforations, hooks, or nodes in the shape of a straight line, cross, star, or ring, as well as fixing rings and fixing hooks provided on the inner wall of the cyclone core tube. The hydrophilic fibers are not limited to a single connection method. The connection method can be configured such that the two ends of the hydrophilic fibers pass through or around the connection holes, hooks, or nodes of the top and bottom fixing devices respectively and are then tied and fixed, or the hydrophilic fibers pass through or around the top and bottom fixing devices in sequence and are then fixed, as long as the hydrophilic fibers form a fiber bundle arranged in an inverted conical fan shape through the top and bottom fixing devices.

[0024] The present invention is further configured such that the diameter of the swirl section is D1, the length of the swirl section is (4-8)D1, and the diameter D1 of the swirl section in the lowest fiber swirl section is preferably 15-35mm.

[0025] The present invention is further configured such that, within each stage of the fiber swirl section, the length L2 of the separation section is (1.5~2.5)D1, the diameter D5 of the outer cylinder is (1.2~2.5)D1, the bottom diameter of the tapering section is the same as D1, the top diameter D2 is (0.7~0.9)D1, the diameter D3 of the aqueous phase outlet is (0.2~0.4)D1, and the diameter D4 of the oil phase outlet is the same as D2.

[0026] The present invention is further configured such that, in each of the sequentially connected fiber swirl sections, the diameter D1 of the swirl section decreases progressively from bottom to top; in two adjacent fiber swirl sections, the diameter D1 of the upper swirl section is 0.7 to 0.9 times the diameter D1 of the lower swirl section.

[0027] The present invention is further configured such that 20 to 40 water outlets are provided on the side wall of the tapering section, with 2 to 4 water outlets evenly distributed in each row, the diameter being 3 to 5 mm, and the vertical spacing of each row of water outlets being 1 / 6 to 1 / 4 of the length L2 of the separation section.

[0028] The invention is further configured such that the swirl-initiating device includes a core located on a central axis and a plurality of swirl-initiating blades arranged around the core. Each swirl-initiating blade includes a lower deflector section and an upper guide section. The deflector section is arranged parallel to the axial direction of the swirl-initiating section, and the guide section is spirally arranged around the core. The spiral angle α of the guide section gradually increases from bottom to top, and the spiral angle α at the outlet of the guide section blade is 55° to 65°.

[0029] The invention is further configured such that the number of swirl-initiating blades in the swirl-initiating device is 4 to 6, and the outer diameter D7 of the swirl-initiating blades is equal to the diameter D1 of the swirling section. The radial width D8 of the core is (1 / 3 to 2 / 3)D7; the axial length H1 of the swirl-initiating blades is (1.5 to 2.5)D7, and the axial length H2 of the swirl-initiating device is (2 to 3)D7. In the swirl-initiating device in the lowest fiber swirling section, the core is hemispherical at the lower end of the swirl-initiating blades and semi-ellipsoidal at the upper end. In the swirl-initiating devices in all fiber swirling sections above, the core is hemispherical at the lower end of the swirl-initiating blades and semi-ellipsoidal at the upper end. The swirl-initiating blades are preferably located 5 to 10 mm above the liquid inlet.

[0030] The beneficial effects of this invention are as follows:

[0031] 1. The built-in fiber-induced aggregation and enhanced cyclone dehydration method of the present invention, through the coupling of a specific structure of an axial flow hydrocyclone and hydrophilic fiber bundles arranged in an inverted conical fan, enhances the cyclone separation effect through the aggregation and guiding effect of hydrophilic fibers, effectively improving the separation efficiency of small-diameter water droplets; and the arrangement position of the hydrophilic fiber bundles can be adjusted as needed to adjust the separation time and separation rate of small oil droplets.

[0032] 2. The device for built-in fiber-induced polymerization and enhanced cyclone dehydration provided by the present invention, through coupling several stages of flow channels, performs multiple separations of oil-water mixtures in a stepwise and graded process. On the one hand, it improves the oil-water separation efficiency, and on the other hand, its multi-stage design can adapt to applications with large variations in dispersed phase concentration, thus having better concentration adaptability.

[0033] 3. The separation method and apparatus of this invention feature high separation efficiency and low pressure loss, overcoming the drawback of a large amount of oil phase being discharged from the underflow port. It is suitable for separating oil-water mixtures containing water droplets of different sizes, and the number of hydrophilic fiber layers, the number of hydrophilic fibers in each layer, and the diameter of the hydrophilic fibers can be flexibly adjusted according to parameters such as the diameter of the small water droplets. Through the above method and apparatus, the removal of small water droplets with an average particle size range of 20-100 micrometers in oil-water mixtures can be significantly enhanced, and the removal rate of water droplets with an average particle size range of 20 micrometers or larger can be improved. Furthermore, by arranging multiple cyclone core tubes in parallel, the processing capacity can be highly flexible, making it widely applicable to the petroleum and petrochemical industries. Attached Figure Description

[0034] Figure 1 Schematic diagram of hydrophilic fiber aggregation to enhance cyclone separation;

[0035] Figure 2 Schematic diagram illustrating how hydrophilic fibers enhance cyclone separation by guiding flow.

[0036] Figure 3 This is a schematic diagram of the cross-sectional distribution of water droplets of different sizes in a swirling flow field;

[0037] Figure 4 This is a schematic diagram of a device for incorporating fiber-induced polymerization and enhancing cyclone dehydration.

[0038] Figure 5 An exploded view of a device for incorporating fiber-induced polymerization and enhancing cyclone dehydration;

[0039] Figure 6 A cross-sectional view of a device for incorporating fiber-induced polymerization and enhancing cyclone dehydration;

[0040] Figure 7 A cross-sectional view of a device for incorporating fiber-induced polymerization and enhancing cyclone dewatering (without fibers);

[0041] Figure 8 This is a cross-sectional view of the separated section;

[0042] Figure 9 This is a schematic diagram of the top retainer.

[0043] Figure 10 Top view of the top retainer;

[0044] Figure 11 This is the front view of the spinning device;

[0045] Figure 12 This is a bottom view of the spinning device;

[0046] Among them, 1. Swirl section; 2. Separation section; 3. Top fixer; 4. Hydrophilic fiber; 1-1. Liquid inlet; 1-2. Swirling device; 1-2-1. Swirling blade; 1-2-2. Core; 1-2-3. Baffle section; 1-2-4. Guide section; 2-1. Gradient section; 2-2. Outer cylinder; 2-3. Oil phase outlet; 2-4. Water phase outlet; 2-5. Water outlet; 3-1. Fixing rod; 3-2. Fiber node. Detailed Implementation

[0047] The technical solution of the present invention will be clearly and completely described below with reference to specific embodiments. It should be understood that the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of the present invention.

[0048] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. In this invention, unless otherwise explicitly specified and limited, the description of the "diameter" of the hollow structure refers to the inner diameter of the structure.

[0049] Example 1

[0050] The present invention provides a method for cyclone dehydration enhanced by built-in fiber-induced polymerization, comprising the following steps:

[0051] (1) The oil-water mixture to be processed enters the hydrocyclone along the axial direction. The hydrocyclone includes several fiber cyclone sections connected in sequence. Under the guiding action of the swirling blades, the mixture obtains a preliminary tangential velocity and axial velocity. Under the action of centrifugal force, larger water droplets migrate to the vicinity of the side wall of the hydrocyclone and flow out from the water phase outlet of the side wall of the hydrocyclone. The oil-water mixture after dehydration and separation flows out from the oil phase outlet at the top of the axial direction, or continues to enter the next fiber cyclone section along the axial direction to achieve further separation of the oil-water mixture.

[0052] At this point, the hydrocyclone cannot effectively separate water droplets of different sizes under the action of swirling current alone, such as... Figure 3 As shown in the cross-sectional distribution diagram, large-diameter water droplets migrate significantly towards the sidewall under centrifugal force, while small-diameter water droplets, due to the small difference in centrifugal force between them and oil, are distributed throughout the entire plane and do not show a significant tendency to aggregate towards the sidewall.

[0053] (2) Each stage of the fiber swirl section is arranged with hydrophilic fiber bundles in an inverted conical fan shape. The starting point, i.e., the apex, of the hydrophilic fiber bundle is located above the starting blade, and the ending point, i.e., the bottom surface, is located above the apex. These bundles can be arranged at any cross-section of the hydrocyclone as needed. The hydrophilic fibers of the bundles can capture small water droplets located in the inner swirl section due to their small particle size through polarity. On the one hand, the aggregation effect of the hydrophilic fibers promotes the coalescence of small water droplets attached to the fibers into larger droplets, which then migrate towards the sidewall under centrifugal force. Figure 1 As shown; on the other hand, with the guiding effect of hydrophilic fibers, under the drag force of the water flow, small water droplets are induced to migrate towards the side wall, such as... Figure 2 As shown, by inducing polymerization with built-in fibers and enhancing cyclone dehydration, the efficiency and accuracy of oil-water separation are effectively improved.

[0054] Furthermore, the hydrophilic fiber bundles arranged in an inverted conical fan shape are arranged in a multi-layered structure. The starting positions of each layer of hydrophilic fiber bundles may be the same or different, and the ending points are located at different cross-sections within the fiber swirl section, preferably below the water outlet on the sidewall of the fiber swirl section. The number of layers of the hydrophilic fiber bundles is not less than 2, and the number of hydrophilic fibers in each layer is not less than 12, evenly distributed along the circumference. The diameter of the hydrophilic fibers is not greater than 200 micrometers, preferably 20 to 50 micrometers.

[0055] Furthermore, the hydrophilic fiber is selected from, but not limited to, natural fibers such as cotton, linen, and silk, as well as hydrophilically modified polyester, nylon, and spandex fibers.

[0056] Furthermore, the swirling blades adopt a design with smoothly connected arc segments of varying helical inclination angles to form a gradually changing transition channel, so that the mixed liquid undergoes a steady flow before changing its flow direction after entering the hydrocyclone.

[0057] Example 2

[0058] like Figure 4-7 As shown, this invention provides a device for enhanced cyclone dewatering with built-in fiber-induced polymerization. The enhanced cyclone dewatering device has a cyclone core tube structure, comprising several sequentially connected fiber cyclone sections. Each fiber cyclone section includes a cyclone section 1 and a separation section 2 connected from bottom to top, wherein:

[0059] The swirl section 1 is a columnar structure. The bottom end of the swirl section 1 is the liquid inlet 1-1. The swirl section 1 is equipped with a swirl-initiating device 1-2 containing a swirl-initiating blade 1-2-1. The swirl-initiating blade 1-2-1 is located 5-10 mm above the liquid inlet 1-1. A top fixing device 3 is provided above the swirl-initiating device 1-2.

[0060] Combination Figure 8As shown, the separation section 2 includes a tapered section 2-1 from bottom to top and an outer cylinder 2-2 disposed outside the tapered section 2-1. The bottom end of the tapered section 2-1 is connected to the top end of the vortex section 1, and the top end is connected to an oil phase outlet 2-3, or connected to the vortex section 1 of the previous fiber vortex section. A water phase outlet 2-4 is provided on the outer wall of the outer cylinder 2-2. Multiple water outlets 2-5 are provided on the side wall of the tapered section 2-1. Several layers of bottom surface fixers are provided on the inner wall of the tapered section 2-1. Several hydrophilic fibers 4 are connected and fixed between the bottom surface fixers and the top surface fixers 3. The hydrophilic fibers 4 are evenly distributed around the central axis of the vortex core tube, so that the fiber bundles formed by the hydrophilic fibers are arranged in several layers of radial inverted conical fan-shaped arrangements. The inverted conical fan-shaped arrangement of the hydrophilic fibers effectively couples the aggregation and guiding effect of the hydrophilic fibers on the basis of vortex separation, which can effectively improve the separation efficiency of small-diameter water droplets.

[0061] Furthermore, the swirl core tube includes 1 to 5 stages of fiber swirl sections, preferably 2 to 3 stages. Figure 4-7 The diagram shows a vortex core tube that includes two stages of fiber vortex sections.

[0062] Furthermore, the hydrophilic fiber bundles arranged in an inverted conical fan shape are arranged in several layers. The apex of each layer of hydrophilic fiber bundle is fixed by the top fixer 3. The apex positions of each layer of hydrophilic fiber bundle may be the same or different. Specifically, they may be located at the same cross-section or at different cross-sections; they may be located at the same position on the same cross-section or at different positions on the same cross-section. The apex position of each layer of hydrophilic fiber bundle can be adjusted as needed, which can advance the separation time of small water droplets and make the separation more rapid. The bottom surface of each layer of hydrophilic fiber bundle is fixed by the bottom surface fixer and is located at different cross-sections of the tapered section 2-1. It is preferably set below the outlet 2-5 of the tapered section 2-1, so that water droplets that migrate to the side wall of the tapered section 2-1 through the aggregation and guiding effect of the hydrophilic fibers 4 enter the outer cylinder 2-2 through the outlet 2-5.

[0063] Furthermore, the hydrophilic fiber bundle has no fewer than 2 layers, preferably 2 to 8 layers, with no fewer than 12 hydrophilic fibers in each layer, and the diameter of the hydrophilic fibers is no greater than 200 micrometers, preferably 20 to 50 micrometers.

[0064] Furthermore, the top retainer 3 and the bottom retainer are not limited to a single shape and structure, including but not limited to fiber traction devices with holes, hooks or nodes in the shape of a straight line, cross, star, or ring, as well as fixing rings and fixing hooks on the inner wall of the cyclone core tube. The hydrophilic fiber 4 is also not limited to a single connection method. The connection method can be set as follows: the two ends of the hydrophilic fiber 4 pass through or around the connection holes, hooks or nodes of the top retainer 3 and the bottom retainer respectively and then tie them together for fixation, or the hydrophilic fiber 4 passes through or around the top retainer 3 and the bottom retainer in sequence and then is fixed. As long as the hydrophilic fiber 4 forms a fiber bundle arranged in an inverted conical fan shape through the top retainer 3 and the bottom retainer.

[0065] Furthermore, such as Figure 9-10 As shown, in this embodiment, the top fixing device 3 is a cross-shaped fiber traction device, including several fixing rods 3-1 fixed to the inner wall of the swirl section 1 in both the horizontal and vertical directions. The fixing rods 3-1 intersect to form several fiber nodes 3-2, for the hydrophilic fibers 4 to be symmetrically fixed at the fiber nodes 3-2. Preferably, there are 1 to 5 fixing rods 3-1 in each of the horizontal and vertical directions. The bottom fixing device consists of several fixing rings (not shown in the figure) set on the inner wall of the tapered section 2-1, for fixing the other end of the hydrophilic fibers 4.

[0066] Furthermore, the diameter of the swirl section 1 is D1, the length L1 of the swirl section 1 is 4 to 8 times the diameter D1, and the diameter D1 of the swirl section 1 in the lowest fiber swirl section is 15 to 35 mm.

[0067] Furthermore, within each fiber swirl section, the length L2 of the separation section 2 is 1.5 to 2.5 times the diameter D1 of the swirl section 1, the diameter D5 of the outer cylinder is 1.2 to 2.5 times the diameter D1 of the swirl section 1, the bottom diameter of the tapering section 2-1 is the same as the diameter D1 of the swirl section 1, the top diameter D2 is 0.7 to 0.9 times the bottom diameter D1, the diameter D3 of the aqueous phase outlet 2-4 is 0.2 to 0.4 times the diameter D1 of the swirl section 1, and the diameter D4 of the oil phase outlet 2-3 is the same as the top diameter D2 of the tapering section 2-1.

[0068] Furthermore, in each of the sequentially connected fiber swirl sections, the diameter D1 of the swirl section 1 decreases progressively from bottom to top. In adjacent fiber swirl sections, the diameter D1 of the previous swirl section 1 is 0.7 to 0.9 times the diameter D1 of the next swirl section 1.

[0069] Furthermore, the sidewall of the tapered section 2-1 is provided with 20 to 40 water outlets 2-5, with 2 to 4 water outlets 2-5 evenly distributed in each row, and the diameter is 3 to 5 mm. The vertical spacing of each row of water outlets 2-5 is 1 / 6 to 1 / 4 of the length L2 of the separation section 2.

[0070] Furthermore, such as Figure 11 and Figure 12 As shown, the swirl-initiating device 1-2 includes a core 1-2-2 located on the central axis and a plurality of swirl-initiating blades 1-2-1 arranged around the core 1-2-2. Each swirl-initiating blade 1-2-1 includes a lower baffle section 1-2-3 and an upper guide section 1-2-4. The baffle section 1-2-3 is arranged parallel to the axial direction of the swirl-initiating section 1, and the guide section 1-2-4 is spirally arranged around the core 1-2-2. The spiral angle α of the guide section 1-2-4, i.e., the angle between the tangent of the outer edge of the blade of the guide section 1-2-4 and the axial direction of the swirl section 1, gradually increases from bottom to top, and the spiral angle α at the outlet of the blade of the guide section 1-2-4 is 55° to 65°. The guide sections 1-2-4 are smoothly connected by circular arc sections with varying spiral inclination angles, forming a gradually changing transition channel. The mixed liquid first undergoes a steady flow in the channel and then gradually changes its flow direction, reducing the droplet shearing and breakage phenomenon caused by turbulence when the fluid passes through the guide section blades, and enhancing the separation effect of the oil and water phases.

[0071] Furthermore, the number of swirl-initiating blades 1-2-1 in the swirl-initiating device 1-2 is 4 to 6, and the outer diameter D7 of the swirl-initiating blades is the same as the diameter D1 of the swirling section 1. The radial width D8 of the core 1-2-2 is (1 / 3 to 2 / 3)D7, the axial length H1 of the swirl-initiating blades 1-2-1 is (1.5 to 2.5)D7, and the axial length of the swirl-initiating device 1-2, i.e., the axial length H2 of the core 1-2-2, is (2 to 3)D7. In the lowest-level fiber swirl section, the swirl initiation device 1-2 has a hemispherical structure at the lower end of the swirl initiation blade 1-2-1 and a semi-ellipsoidal structure at the upper end; in the swirl initiation devices 1-2 in all the above-level fiber swirl sections, the swirl initiation device 1-2 has a semi-ellipsoidal structure at the lower end of the swirl initiation blade 1-2-1 and a hemispherical structure at the upper end.

[0072] In this embodiment, the swirl section 1 and the separation section 2, the separation section 2 and the swirl section 1 of the previous fiber swirl section, and the separation section 2 and the oil phase outlet 2-3 are all connected by flanges.

[0073] Based on the aforementioned device for inducing polymerization and enhancing cyclone dehydration using built-in fibers, the oil-water separation operation is as follows:

[0074] (1) The material to be processed enters the swirling section 1 through the inlet 1-1 of the lowest fiber swirling section. Under the action of the swirling blades 1-2-1, the mixture obtains tangential velocity. Under the action of centrifugal force, large-diameter water droplets migrate to the vicinity of the side wall of the hydrocyclone.

[0075] (2) The mixture passes through the hydrophilic fiber bundles arranged in an inverted conical fan shape. The hydrophilic fibers 4 can capture small water droplets that cannot be effectively separated due to their small particle size, which helps the small water droplets to aggregate and migrate towards the side wall under the action of centrifugal swirling. At the same time, with the help of the guiding effect of the hydrophilic fibers 4, it also helps the small water droplets migrate towards the side wall.

[0076] (3) Water droplets migrating toward the sidewall enter the outer cylinder 2-2 of the separation section 2 through the outlet 2-5 and flow out from the water phase outlet 2-4. The oil phase after dehydration and separation continues to enter the next stage fiber cyclone section along the axial direction to achieve further separation of the oil-water mixture, or flows out from the oil phase outlet 2-3.

[0077] This application provides a detailed description, the purpose of which is to enable those skilled in the art to understand and implement the content of this application, but it should not be used to limit the scope of protection of this application. All equivalent changes or modifications made in accordance with the spirit and essence of this application should be included within the scope of protection of this application.

Claims

1. A method for cyclone dehydration with built-in fiber-induced polymerization and enhanced flow, characterized in that, The method is as follows: the oil-water mixture enters the hydrocyclone axially, the hydrocyclone comprising several sequentially connected fiber cyclone sections. Under the guiding action of the swirling blades, the mixture acquires tangential and axial velocities. Under the action of centrifugal force, large-diameter water droplets migrate to the sidewall of the hydrocyclone and flow out from the water phase outlet of the sidewall. The oil-water mixture after dehydration and separation flows out from the oil phase outlet at the top, or continues to enter the next stage of fiber cyclone section axially. Each stage of the fiber swirl section is equipped with hydrophilic fiber bundles arranged in an inverted conical fan shape. The apex of the hydrophilic fiber bundle is located above the swirl-initiating blade, and the bottom surface of the hydrophilic fiber bundle is located above the apex. The hydrophilic fibers capture small water droplets in the inner swirl section due to their small particle size by means of polarity. On the one hand, the aggregation effect of the hydrophilic fibers promotes the aggregation of small water droplets attached to the hydrophilic fibers into larger water droplets, which migrate towards the sidewall under the action of centrifugal force. On the other hand, the flow guiding effect of the hydrophilic fibers induces small water droplets to migrate towards the sidewall under the action of water flow drag force. The swirl dehydration is enhanced by the aggregation induced by the built-in fibers. The oil-water mixture is a mixture with oil as the main phase and water as the dispersed phase, wherein the concentration of the dispersed phase ranges from 0.1% to 30%.

2. The method for induced polymerization and enhanced cyclone dehydration with built-in fibers according to claim 1, characterized in that, The hydrophilic fiber bundles arranged in an inverted conical fan shape are arranged in a multi-layer structure. The apex positions of each layer of hydrophilic fiber bundles may be the same or different, and the bottom surface is located below the water outlet of the side wall of the fiber swirl section.

3. The method for induced polymerization and enhanced cyclone dehydration with built-in fibers according to claim 1, characterized in that, The hydrophilic fiber bundle has no fewer than two layers, with no fewer than 12 hydrophilic fibers in each layer, evenly distributed along the circumference, and the diameter of the hydrophilic fibers is no greater than 200 micrometers.

4. A device for built-in fiber-induced polymerization and enhanced cyclone dehydration, characterized in that, The enhanced cyclone dewatering device includes several stages of fiber cyclone sections connected in sequence, each fiber cyclone section comprising a cyclone section and a separation section connected from bottom to top, wherein: The swirl section is a columnar structure with a liquid inlet at the bottom and a swirl-inducing device inside. A top-end fixer is provided above the swirl-inducing device. The swirl-inducing device includes a core located on the central axis and a plurality of swirl-inducing blades arranged around the core. The number of swirl-inducing blades is 4 to 6. Each swirl-inducing blade includes a lower deflector section and an upper guide section. The deflector section is arranged parallel to the axial direction of the swirl-inducing section. The guide section is spirally arranged around the core. The spiral angle α of the guide section gradually increases from bottom to top, and the spiral angle α at the outlet of the guide section blade is 55° to 65°. The separation section includes a tapering section from bottom to top and an outer cylinder disposed outside the tapering section. The bottom end of the tapering section is connected to the top end of the vortex section, and the top end is provided with an oil phase outlet, or is connected to the vortex section of the previous fiber vortex section. The outer wall of the outer cylinder is provided with a water phase outlet. The side wall of the tapering section is provided with multiple water outlets. The inner wall of the tapering section is provided with several layers of bottom surface fixers. Several hydrophilic fibers are connected between the bottom surface fixers and the top surface fixers. The fiber bundles formed by the hydrophilic fibers are arranged in several layers of inverted conical fan-shaped arrangements. The apex of each layer of hydrophilic fiber bundle is fixed by the top surface fixer, and the apex positions may be the same or different. The bottom surface of each layer of hydrophilic fiber bundle is fixed by the bottom surface fixer and is disposed below the water outlet of the tapering section.

5. The device for built-in fiber-induced polymerization and enhanced cyclone dehydration according to claim 4, characterized in that, The enhanced cyclone dehydration device includes 1 to 5 stages of fiber cyclone sections; the hydrophilic fiber bundle has no less than 2 layers, each layer has no less than 12 hydrophilic fibers, and the diameter of the hydrophilic fibers is no greater than 200 micrometers.

6. The device for built-in fiber-induced polymerization and enhanced cyclone dewatering according to claim 4, characterized in that, The diameter of the swirling section is D1, and the length of the swirling section is (4~8)D1. In each of the sequentially connected fiber swirling sections, the diameter D1 of the swirling section decreases from bottom to top.

7. The device for built-in fiber-induced polymerization and enhanced cyclone dewatering according to claim 4, characterized in that, Within each fiber swirl section, the length L2 of the separation section is (1.5~2.5)D1, the diameter D5 of the outer cylinder is (1.2~2.5)D1, the bottom diameter of the tapering section is the same as D1, the top diameter D2 is (0.7~0.9)D1, the diameter D3 of the aqueous phase outlet is (0.2~0.4)D1, and the diameter D4 of the oil phase outlet is the same as D2; the tapering section has 20~40 outlets on its sidewall, with 2~4 outlets evenly distributed in each row, each outlet having a diameter of 3~5mm, and the vertical spacing between each outlet is 1 / 6~1 / 4 of the separation section length L2.

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