Two-phase cyclone separation device and separation method

Abstract

The application provides a two-phase cyclone separation device and a separation method. The device comprises a cyclone separator underflow pipe, a cyclone cone, a cyclone cylinder, a cyclone inlet, a cyclone overflow pipe and a circulating flow guide pipe. The circulating flow guide pipe is arranged in the interior of the cyclone cylinder. The bottom of the cyclone cylinder is communicated with the cyclone cone. The cyclone inlet connected to the top side of the cyclone cylinder serves as a fluid inlet. The top of the cyclone cylinder is connected with the cyclone overflow pipe. The cyclone separator underflow pipe arranged below the cyclone cone serves as an outer cyclone outlet. The application can optimize and improve the internal flow field of the cyclone separator, especially the flow field of the circulating flow, expand the area of the circulating flow and improve the two-phase separation efficiency.

Description

Technical Field

[0001] This invention relates to the field of cyclone separation technology, and more particularly to a two-phase cyclone separation device and separation method. Background Technology

[0002] A hydrocyclone separator is a separation device used in gas-solid or liquid-solid systems, widely applied in chemical, metallurgical, building materials, and environmental protection industries. Traditional hydrocyclones exhibit internal flow patterns including internal swirling, external swirling, circulating flow, and short-circuit flow. Fluid entering the hydrocyclone initially moves downwards in a spiral pattern, forming an external swirling flow. As the fluid enters the lower inverted cone, the axial cross-section gradually narrows, increasing resistance to further downward movement and exiting through the underflow outlet. Near the underflow outlet, a large amount of fluid begins to migrate inwards, changing direction and moving upwards along a spiral pattern in the central region of the hydrocyclone, forming an internal swirling flow. The internal and external swirling flows share the same rotational direction (tangential velocity), but their axial directions are opposite. Ultimately, the internal swirling flow, carrying fine and light particles, flows out through the overflow pipe; coarse and heavy particles are discharged through the underflow outlet along with the external swirling flow.

[0003] Besides the swirling and internal swirling flows, short-circuit flow and circulating flow also exist within the hydrocyclone. These two flow patterns are important characteristics of the swirling flow field and have a significant impact on swirling separation performance. Since the overflow pipe cannot completely discharge the upward-flowing internal swirling flow, a circulating flow forms between the overflow pipe wall and the hydrocyclone wall. The circulating flow contains approximately 30%–60% medium and fine particles, with medium-sized particles having the highest probability of entering the circulating flow, while coarse particles have the lowest probability. Generally, the circulating flow can produce a secondary separation effect, improving swirling separation performance; however, current industrial applications lack effective utilization of the circulating flow. Therefore, optimizing the structure of the swirling separator to enhance the internal circulating flow can improve the separation efficiency of gas-solid or liquid-solid two-phase systems. Summary of the Invention

[0004] In response to the aforementioned technical problems, a two-phase cyclone separation device and separation method are provided.

[0005] The technical means employed in this invention are as follows:

[0006] A two-phase cyclone separator includes: a cyclone separator underflow pipe, a cyclone cone, a cyclone cylinder, a cyclone inlet, a cyclone overflow pipe, and a circulating flow guide pipe. The circulating flow guide pipe is disposed inside the cyclone cylinder. The bottom of the cyclone cylinder is connected to the cyclone cone, and the cyclone inlet connected to the top side serves as a fluid inlet. The top of the cyclone cylinder is connected to the cyclone overflow pipe. The cyclone separator underflow pipe disposed below the cyclone cone serves as an external cyclone outlet.

[0007] Furthermore, the circulating flow guide pipe is a gradually converging and expanding pipe.

[0008] Furthermore, the circulating flow guide pipe includes an internally connected and coaxially arranged guide diffuser, a guide pipe middle section, and a guide converging pipe. The two ends of the guide pipe middle section are connected to the guide diffuser and the guide converging pipe. The guide diffuser is a frustum structure that gradually expands toward the hydrocyclone overflow pipe, and the end of the guide diffuser away from the guide pipe middle section is the outlet. The guide converging pipe is a frustum structure that gradually narrows toward the guide pipe middle section, and the end of the guide converging pipe away from the guide pipe middle section is the inlet.

[0009] Furthermore, the divergence angle of the guide diffuser is 0 to 30°, and the ratio of the outlet cross-sectional area of ​​the guide diffuser to the cross-sectional area of ​​the hydrocyclone cylinder is 0.1 to 0.6.

[0010] Furthermore, the convergence angle of the guide converging tube is 0 to 45°, and the ratio of the inlet cross-sectional area of ​​the guide converging tube to the cross-sectional area of ​​the hydrocyclone cylinder is 0.1 to 0.75.

[0011] Furthermore, the ratio of the inner diameter of the middle section of the guide tube to the inner diameter of the hydrocyclone cylinder is 0.1 to 0.4.

[0012] The present invention also provides a separation method for a two-phase cyclone separator, comprising the following steps:

[0013] Fluid enters the hydrocyclone cylinder from the inlet, forming an outer swirling flow that flows downward through the hydrocyclone cone, carrying coarse particles and exiting through the underflow pipe of the hydrocyclone separator. The inner swirling flow forms an upward movement at the hydrocyclone cone. The overflow pipe of the hydrocyclone cannot completely discharge the upward-flowing inner swirling flow, thus forming a circulating flow between the overflow pipe wall and the hydrocyclone wall. After the inner swirling flow and the circulating flow pass through the circulating flow guide pipe, the fluid flow field is regulated, the circulating flow inside the hydrocyclone cylinder is enhanced, and the secondary separation effect of the circulating flow is strengthened. After the secondary separation, the inner swirling flow carrying fine particles is discharged through the hydrocyclone overflow pipe.

[0014] Furthermore, the internal swirling flow and the circulating flow flow from bottom to top inside the circulating flow guide tube, while the circulating flow flows from top to bottom outside the circulating flow guide tube, forming an expanded flow circulation that passes through the circulating flow guide tube.

[0015] Furthermore, the ratio of the flow rate of the circulating flow to the flow rate of the fluid entering the hydrocyclone inlet is 0.01 to 0.2, the average particle size of the particles carried by the fluid is not greater than 5 mm, and the particle volume fraction is not greater than 25%.

[0016] Furthermore, the separation method targets gas-solid two-phase flow or liquid-solid two-phase flow.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. This invention can optimize and improve the internal flow field of a cyclone separator, especially the flow field of the circulating flow, expand the region of the circulating flow, and improve the two-phase separation efficiency.

[0019] 2. This invention only requires minor structural modifications to a traditional cyclone separator, resulting in low modification and maintenance costs, wide application areas, and strong practicality.

[0020] 3. This invention is equipped with a circulating flow guide pipe. After the inner swirling flow and the circulating flow pass through the circulating flow guide pipe, the fluid flow field is adjusted, the circulating flow inside the hydrocyclone cylinder 3 is enhanced, and the secondary separation effect of the circulating flow is strengthened. After the secondary separation effect, the inner swirling flow carrying fine particles is discharged through the hydrocyclone overflow pipe.

[0021] Based on the above reasons, this invention can be widely promoted in fields such as chemical engineering, metallurgy, building materials, and environmental protection for two-phase separation. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the cyclone separator structure described in this invention.

[0024] Figure 2 This is a schematic diagram of the expanded circulating flow through the circulating flow guide pipe described in this invention.

[0025] Figure 3 This is a schematic diagram of the circulating flow guide tube described in this invention.

[0026] In the figure: 1. Hydrocyclone separator underflow pipe; 2. Hydrocyclone cone; 3. Hydrocyclone cylinder; 4. Hydrocyclone inlet; 5. Hydrocyclone overflow pipe; 6. Circulating flow guide pipe; 7. Guide diffuser; 8. Middle section of guide pipe; 9. Guide converging pipe; α, Diverging angle of guide diffuser; β, Converging angle of guide converging pipe. Detailed Implementation

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. 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 protection of the present invention.

[0029] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0030] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0031] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0032] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0033] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0034] like Figure 1-3 As shown, this invention provides a two-phase cyclone separator and a separation method. This invention optimizes and improves the structure of the cyclone separator, enhancing the internal circulation flow and thus improving the separation efficiency of gas-solid or liquid-solid two-phase separation.

[0035] To improve existing cyclone separators, one objective of this invention is to provide a two-phase cyclone separator based on an expanded circulating flow, which can enhance the circulating flow field and improve the two-phase separation efficiency of the cyclone separator.

[0036] A two-phase cyclone separator based on expanded circulating flow includes a cyclone separator underflow pipe 1, a cyclone cone 2, a cyclone cylinder 3, a cyclone inlet 4, a cyclone overflow pipe 5, and a circulating flow guide pipe 6. The bottom of the cyclone cylinder 3 is connected to the cyclone cone 2, the top side is connected to the cyclone inlet 4 as a fluid inlet, and the top is connected to the cyclone overflow pipe 5. The cyclone separator underflow pipe 1 is set below the cyclone cone 2 as an external cyclone outlet.

[0037] The hydrocyclone cylinder 3 is equipped with a circulating flow guide pipe 6, which is a gradually expanding and contracting pipe. From top to bottom, the structure consists of a gradually expanding guide pipe 7, a middle section 8, and a gradually contracting guide pipe 9. The upper part of the circulating flow guide pipe 6 is the gradually expanding guide pipe 7, with a contraction angle α of 0–30°. The ratio of the outlet cross-sectional area of ​​the gradually expanding guide pipe 7 to the cross-sectional area of ​​the hydrocyclone cylinder 3 is 0.1–0.6. The lower part of the circulating flow guide pipe 6 is the gradually contracting guide pipe 9, with a contraction angle β of 0–45°. The ratio of the inlet cross-sectional area of ​​the gradually contracting guide pipe 9 to the cross-sectional area of ​​the hydrocyclone cylinder 3 is 0.1–0.75. The middle part of the circulating flow guide pipe 6 is the middle section 8, with the ratio of its inner diameter to the inner diameter of the hydrocyclone cylinder 3 being 0.1–0.4.

[0038] The second objective of this invention is to provide a two-phase separation method based on expanded circulating flow. The method comprises a two-phase separation device with a hydrocyclone separator underflow pipe 1, a hydrocyclone cone 2, a hydrocyclone cylinder 3, a hydrocyclone inlet 4, a hydrocyclone overflow pipe 5, and a circulating flow guide pipe 6. The circulating flow guide pipe 6 within the two-phase separation device is a gradually expanding and contracting pipe, with a top-to-bottom structure consisting of a guide diffuser 7, a guide pipe middle section 8, and a guide converging pipe 9. Fluid enters the hydrocyclone cylinder 3 from the hydrocyclone inlet 4. The resulting outer swirling flow flows downwards through the hydrocyclone cone 2, carrying coarse particles, and is discharged from the hydrocyclone separator underflow pipe 1. The resulting inner swirling flow moves upwards at the hydrocyclone cone 2. The hydrocyclone overflow pipe 5 cannot completely discharge the upward-flowing inner swirling flow, thus forming a circulating flow between the overflow pipe wall and the hydrocyclone wall. After the internal swirling flow and the circulating flow pass through the circulating flow guide pipe 6, the fluid flow field is regulated, the circulating flow inside the hydrocyclone cylinder 3 is enhanced, and the secondary separation effect of the circulating flow is strengthened. After the secondary separation, the internal swirling flow carrying fine particles is discharged through the hydrocyclone overflow pipe 5.

[0039] The two-phase separation method separates either gas-solid or liquid-solid two-phase flows. The internal swirling flow and the circulating flow pass from bottom to top inside the circulating flow guide pipe 6, while the circulating flow passes from top to bottom outside the circulating flow guide pipe 6, forming an expanded flow circulation through the circulating flow guide pipe 6. The ratio of the circulating flow rate to the fluid flow rate entering the hydrocyclone inlet 4 is 0.01 to 0.2. The average particle size carried by the fluid is no greater than 5 mm, and the particle volume fraction is no greater than 25%.

[0040] The third objective of this invention is to provide an application of the above-mentioned system or method in the fields of two-phase separation, such as chemical engineering, metallurgy, building materials, and environmental protection.

[0041] Example 1

[0042] The separation process is as follows: Fluid enters the hydrocyclone cylinder 3 from the hydrocyclone inlet 4. The resulting outer swirling flow flows downward through the hydrocyclone cone 2, carrying coarse particles and exiting through the underflow pipe 1 of the hydrocyclone separator. The resulting inner swirling flow moves upward at the hydrocyclone cone 2. The hydrocyclone overflow pipe 5 cannot completely discharge the upward-flowing inner swirling flow, thus forming a circulating flow between the overflow pipe wall and the hydrocyclone cylinder wall. After the inner swirling flow and the circulating flow pass through the circulating flow guide pipe 6, the fluid flow field is adjusted, the circulating flow inside the hydrocyclone cylinder 3 is enhanced, and the secondary separation effect of the circulating flow is strengthened. After the secondary separation, the inner swirling flow carrying fine particles is discharged through the hydrocyclone overflow pipe 5, completing the separation.

[0043] Pulverized coal was used in the experiment, and solid particles smaller than 5 mm were obtained through crushing and screening. For the circulating flow guide pipe 6, the diverging angle of its guide diffuser 7 was 20°, and the ratio of its outlet cross-sectional area to the cross-sectional area of ​​the hydrocyclone cylinder 3 was 0.5; the contraction angle of its guide converging pipe 9 was 30°, and the ratio of its inlet cross-sectional area to the cross-sectional area of ​​the hydrocyclone cylinder 3 was 0.5; the ratio of the inner diameter of its middle section 8 to the inner diameter of the hydrocyclone cylinder 3 was 0.3. The fluid velocity at the hydrocyclone inlet 4 was 3.5 m / s, carrying a particle volume fraction of 7.8%. Experimental results showed that the underflow particle volume fraction of the two-phase separation device was 37.6%, and the overflow particle volume fraction was 0.75%.

[0044] Example 2

[0045] The separation process is as follows: Fluid enters the hydrocyclone cylinder 3 from the hydrocyclone inlet 4. The resulting outer swirling flow flows downward through the hydrocyclone cone 2, carrying coarse particles and exiting through the underflow pipe 1 of the hydrocyclone separator. The resulting inner swirling flow moves upward at the hydrocyclone cone 2. The hydrocyclone overflow pipe 5 cannot completely discharge the upward-flowing inner swirling flow, thus forming a circulating flow between the overflow pipe wall and the hydrocyclone cylinder wall. After the inner swirling flow and the circulating flow pass through the circulating flow guide pipe 6, the fluid flow field is adjusted, the circulating flow inside the hydrocyclone cylinder 3 is enhanced, and the secondary separation effect of the circulating flow is strengthened. After the secondary separation, the inner swirling flow carrying fine particles is discharged through the hydrocyclone overflow pipe 5, completing the separation.

[0046] Pulverized coal was used in the experiment, and solid particles smaller than 5 mm were obtained through crushing and screening. For the circulating flow guide pipe 6, the diverging angle of its guide diffuser 7 was 20°, and the ratio of its outlet cross-sectional area to the cross-sectional area of ​​the hydrocyclone cylinder 3 was 0.5; the contraction angle of its guide converging pipe 9 was 30°, and the ratio of its inlet cross-sectional area to the cross-sectional area of ​​the hydrocyclone cylinder 3 was 0.4; the ratio of the inner diameter of its middle section 8 to the inner diameter of the hydrocyclone cylinder 3 was 0.3. The fluid velocity at the hydrocyclone separator inlet 4 was 4.2 m / s, carrying a particle volume fraction of 11.2%. Experimental results showed that the underflow particle volume fraction of the two-phase separation device was 40.1%, and the overflow particle volume fraction was 1.02%.

[0047] Example 3

[0048] The separation process is as follows: Fluid enters the hydrocyclone cylinder 3 from the hydrocyclone inlet 4. The resulting outer swirling flow flows downward through the hydrocyclone cone 2, carrying coarse particles and exiting through the underflow pipe 1 of the hydrocyclone separator. The resulting inner swirling flow moves upward at the hydrocyclone cone 2. The hydrocyclone overflow pipe 5 cannot completely discharge the upward-flowing inner swirling flow, thus forming a circulating flow between the overflow pipe wall and the hydrocyclone cylinder wall. After the inner swirling flow and the circulating flow pass through the circulating flow guide pipe 6, the fluid flow field is adjusted, the circulating flow inside the hydrocyclone cylinder 3 is enhanced, and the secondary separation effect of the circulating flow is strengthened. After the secondary separation, the inner swirling flow carrying fine particles is discharged through the hydrocyclone overflow pipe 5, completing the separation.

[0049] Pulverized coal was used in the experiment, and solid particles smaller than 5 mm were obtained through crushing and screening. For the circulating flow guide pipe 6, the diverging angle of its guide diffuser 7 was 20°, and the ratio of its outlet cross-sectional area to the cross-sectional area of ​​the hydrocyclone cylinder 3 was 0.4; the contraction angle of its guide converging pipe 9 was 30°, and the ratio of its inlet cross-sectional area to the cross-sectional area of ​​the hydrocyclone cylinder 3 was 0.5; the ratio of the inner diameter of its middle section 8 to the inner diameter of the hydrocyclone cylinder 3 was 0.3. The fluid velocity at the hydrocyclone separator inlet 4 was 5.7 m / s, and the volume fraction of particles carried was 1.6%. Experimental results showed that the underflow particle volume fraction of the two-phase separation device was 20.3%, and the overflow particle volume fraction was 0.04%.

[0050] Example 4

[0051] The separation process is as follows: Fluid enters the hydrocyclone cylinder 3 from the hydrocyclone inlet 4. The resulting outer swirling flow flows downward through the hydrocyclone cone 2, carrying coarse particles and exiting through the underflow pipe 1 of the hydrocyclone separator. The resulting inner swirling flow moves upward at the hydrocyclone cone 2. The hydrocyclone overflow pipe 5 cannot completely discharge the upward-flowing inner swirling flow, thus forming a circulating flow between the overflow pipe wall and the hydrocyclone cylinder wall. After the inner swirling flow and the circulating flow pass through the circulating flow guide pipe 6, the fluid flow field is adjusted, the circulating flow inside the hydrocyclone cylinder 3 is enhanced, and the secondary separation effect of the circulating flow is strengthened. After the secondary separation, the inner swirling flow carrying fine particles is discharged through the hydrocyclone overflow pipe 5, completing the separation.

[0052] Pulverized coal was used in the experiment, and solid particles smaller than 5 mm were obtained through crushing and screening. For the circulating flow guide pipe 6, the diverging angle of its guide diffuser 7 was 20°, and the ratio of its outlet cross-sectional area to the cross-sectional area of ​​the hydrocyclone cylinder 3 was 0.5; the contraction angle of its guide converging pipe 9 was 30°, and the ratio of its inlet cross-sectional area to the cross-sectional area of ​​the hydrocyclone cylinder 3 was 0.5; the ratio of the inner diameter of its middle section 8 to the inner diameter of the hydrocyclone cylinder 3 was 0.4. The fluid velocity at the hydrocyclone separator inlet 4 was 3.8 m / s, and the volume fraction of particles carried was 5.5%. Experimental results showed that the underflow particle volume fraction of the two-phase separation device was 22.3%, and the overflow particle volume fraction was 0.51%.

[0053] Example 5

[0054] The separation process is as follows: Fluid enters the hydrocyclone cylinder 3 from the hydrocyclone inlet 4. The resulting outer swirling flow flows downward through the hydrocyclone cone 2, carrying coarse particles and exiting through the underflow pipe 1 of the hydrocyclone separator. The resulting inner swirling flow moves upward at the hydrocyclone cone 2. The hydrocyclone overflow pipe 5 cannot completely discharge the upward-flowing inner swirling flow, thus forming a circulating flow between the overflow pipe wall and the hydrocyclone cylinder wall. After the inner swirling flow and the circulating flow pass through the circulating flow guide pipe 6, the fluid flow field is adjusted, the circulating flow inside the hydrocyclone cylinder 3 is enhanced, and the secondary separation effect of the circulating flow is strengthened. After the secondary separation, the inner swirling flow carrying fine particles is discharged through the hydrocyclone overflow pipe 5, completing the separation.

[0055] Pulverized coal was used in the experiment, and solid particles smaller than 5 mm were obtained through crushing and screening. For the circulating flow guide pipe 6, the diverging angle of its guide diffuser 7 was 20°, and the ratio of its outlet cross-sectional area to the cross-sectional area of ​​the hydrocyclone cylinder 3 was 0.5; the contraction angle of its guide converging pipe 9 was 30°, and the ratio of its inlet cross-sectional area to the cross-sectional area of ​​the hydrocyclone cylinder 3 was 0.5; the ratio of the inner diameter of its middle section 8 to the inner diameter of the hydrocyclone cylinder 3 was 0.3. The fluid velocity at the hydrocyclone separator inlet 4 was 2.6 m / s, and the volume fraction of particles carried was 1.5%. Experimental results showed that the underflow particle volume fraction of the two-phase separation device was 16.2%, and the overflow particle volume fraction was 0.13%.

[0056] Example 6

[0057] The separation process is as follows: Fluid enters the hydrocyclone cylinder 3 from the hydrocyclone inlet 4. The resulting outer swirling flow flows downward through the hydrocyclone cone 2, carrying coarse particles and exiting through the underflow pipe 1 of the hydrocyclone separator. The resulting inner swirling flow moves upward at the hydrocyclone cone 2. The hydrocyclone overflow pipe 5 cannot completely discharge the upward-flowing inner swirling flow, thus forming a circulating flow between the overflow pipe wall and the hydrocyclone cylinder wall. After the inner swirling flow and the circulating flow pass through the circulating flow guide pipe 6, the fluid flow field is adjusted, the circulating flow inside the hydrocyclone cylinder 3 is enhanced, and the secondary separation effect of the circulating flow is strengthened. After the secondary separation, the inner swirling flow carrying fine particles is discharged through the hydrocyclone overflow pipe 5, completing the separation.

[0058] Pulverized coal was used in the experiment, and solid particles smaller than 5 mm were obtained through crushing and screening. For the circulating flow guide pipe 6, the diverging angle of its guide diffuser 7 was 20°, and the ratio of its outlet cross-sectional area to the cross-sectional area of ​​the hydrocyclone cylinder 3 was 0.5; the contraction angle of its guide converging pipe 9 was 30°, and the ratio of its inlet cross-sectional area to the cross-sectional area of ​​the hydrocyclone cylinder 3 was 0.5; the ratio of the inner diameter of its middle section 8 to the inner diameter of the hydrocyclone cylinder 3 was 0.3. The fluid velocity at the hydrocyclone separator inlet 4 was 1.7 m / s, carrying a particle volume fraction of 7.8%. Experimental results showed that the underflow particle volume fraction of the two-phase separation device was 21.6%, and the overflow particle volume fraction was 1.66%.

[0059] Comparative Example 1

[0060] The separation process is as follows: Fluid enters the hydrocyclone cylinder 3 from the hydrocyclone inlet 4. The resulting outer swirling flow flows downward through the hydrocyclone cone 2, carrying coarse and heavy particles, and is discharged through the underflow pipe 1 of the hydrocyclone separator. The resulting inner swirling flow moves upward at the hydrocyclone cone 2. The hydrocyclone overflow pipe 5 cannot completely discharge the upward-flowing inner swirling flow, thus forming a circulating flow between the overflow pipe wall and the hydrocyclone cylinder wall. The inner swirling flow, carrying fine particles, is discharged through the hydrocyclone overflow pipe 5, completing the separation.

[0061] Pulverized coal was used in the experiment, and solid particles smaller than 5 mm were obtained through crushing and screening. The fluid velocity at the inlet 4 of the hydrocyclone separator was 3.4 m / s, and the volume fraction of the carried particles was 7.8%. The experimental results showed that the volume fraction of particles in the underflow of the two-phase separation device was 32.3%, and the volume fraction of particles in the overflow was 1.57%. The results are detailed in Table 1.

[0062] Comparative Example 2

[0063] The separation process is as follows: Fluid enters the hydrocyclone cylinder 3 from the hydrocyclone inlet 4. The resulting outer swirling flow flows downward through the hydrocyclone cone 2, carrying coarse and heavy particles, and is discharged through the underflow pipe 1 of the hydrocyclone separator. The resulting inner swirling flow moves upward at the hydrocyclone cone 2. The hydrocyclone overflow pipe 5 cannot completely discharge the upward-flowing inner swirling flow, thus forming a circulating flow between the overflow pipe wall and the hydrocyclone cylinder wall. The inner swirling flow, carrying fine particles, is discharged through the hydrocyclone overflow pipe 5, completing the separation.

[0064] Pulverized coal was used in the experiment, and solid particles smaller than 5 mm were obtained through crushing and screening. The fluid velocity at the inlet 4 of the hydrocyclone separator was 4.4 m / s, and the volume fraction of the carried particles was 9.6%. The experimental results showed that the underflow particle volume fraction of the two-phase separation device was 27.9%, and the overflow particle volume fraction was 2.54%. The results are detailed in Table 1.

[0065] Comparative Example 3

[0066] The separation process is as follows: Fluid enters the hydrocyclone cylinder 3 from the hydrocyclone inlet 4. The resulting outer swirling flow flows downward through the hydrocyclone cone 2, carrying coarse and heavy particles, and is discharged through the underflow pipe 1 of the hydrocyclone separator. The resulting inner swirling flow moves upward at the hydrocyclone cone 2. The hydrocyclone overflow pipe 5 cannot completely discharge the upward-flowing inner swirling flow, thus forming a circulating flow between the overflow pipe wall and the hydrocyclone cylinder wall. The inner swirling flow, carrying fine particles, is discharged through the hydrocyclone overflow pipe 5, completing the separation.

[0067] Pulverized coal was used in the experiment, and solid particles smaller than 5 mm were obtained through crushing and screening. The fluid velocity at the inlet 4 of the hydrocyclone separator was 2.4 m / s, and the volume fraction of the carried particles was 1.6%. The experimental results showed that the volume fraction of particles in the underflow of the two-phase separation device was 14.0%, and the volume fraction of particles in the overflow was 0.52%. The results are detailed in Table 1.

[0068] Table 1 Experimental Results

[0069]

[0070] R1: The ratio of the cross-sectional area of ​​the diffuser outlet to the cross-sectional area of ​​the hydrocyclone cylinder; R2: The ratio of the cross-sectional area of ​​the converging tube inlet to the cross-sectional area of ​​the hydrocyclone cylinder; R3: The ratio of the inner diameter of the middle section of the guide tube to the inner diameter of the hydrocyclone cylinder.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention 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; and these 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 the present invention.

Claims

1. A two-phase cyclone separator, characterized in that, include: The cyclone separator includes an underflow pipe (1), a cyclone cone (2), a cyclone cylinder (3), a cyclone inlet (4), a cyclone overflow pipe (5), and a circulating flow guide pipe (6). The circulating flow guide pipe (6) is located inside the cyclone cylinder (3). The bottom of the cyclone cylinder (3) is connected to the cyclone cone (2), and the cyclone inlet (4) connected to the top side serves as the fluid inlet. The top is connected to the cyclone overflow pipe (5). The underflow pipe (1) of the cyclone separator located below the cyclone cone (2) serves as the outer cyclone outlet. The circulating flow guide pipe (6) is a gradually converging and expanding pipe; The circulating flow guide pipe (6) includes an internally connected and coaxially arranged guide diffuser (7), guide pipe middle section (8), and guide converging pipe (9). The two ends of the guide pipe middle section (8) are connected to the guide diffuser (7) and the guide converging pipe (9). The guide diffuser (7) is a frustum structure that gradually expands toward the hydrocyclone overflow pipe (5), and the end of the guide diffuser (7) away from the guide pipe middle section (8) is the outlet. The guide converging pipe (9) is a frustum structure that gradually narrows toward the guide pipe middle section (8), and the end of the guide converging pipe (9) away from the guide pipe middle section (8) is the inlet. The divergence angle of the flow guide diffuser (7) is 0°. α 30°, the ratio of the outlet cross-sectional area of ​​the guide diffuser (7) to the cross-sectional area of ​​the hydrocyclone cylinder (3) is 0.1~0.6; The taper angle of the flow guide tapering tube (9) is 0°. β 45°, the ratio of the inlet cross-sectional area of ​​the guide converging tube (9) to the cross-sectional area of ​​the hydrocyclone cylinder (3) is 0.1~0.75; The ratio of the inner diameter of the middle section (8) of the guide tube to the inner diameter of the hydrocyclone cylinder (3) is 0.1 to 0.

4.

2. A separation method for the two-phase cyclone separator as described in claim 1, characterized in that, Includes the following steps: The fluid enters the hydrocyclone cylinder (3) from the hydrocyclone inlet (4). The resulting outer swirling flow flows downward through the hydrocyclone cone (2) and carries coarse particles out through the hydrocyclone underflow pipe (1). The resulting inner swirling flow moves upward at the hydrocyclone cone (2). The hydrocyclone overflow pipe (5) cannot discharge all the upward-flowing inner swirling flow, thus forming a circulating flow between the overflow pipe wall and the hydrocyclone wall. After the inner swirling flow and the circulating flow pass through the circulating flow guide pipe (6), the fluid flow field is regulated, the circulating flow inside the hydrocyclone cylinder (3) is enhanced, and the secondary separation effect of the circulating flow is enhanced. After the secondary separation effect, the inner swirling flow carries fine particles out through the hydrocyclone overflow pipe (5).

3. The separation method of the two-phase cyclone separator according to claim 2, characterized in that, The internal swirling flow and the circulating flow flow from bottom to top inside the circulating flow guide tube (6), while the circulating flow flows from top to bottom outside the circulating flow guide tube (6), forming an expanded flow circulation that passes through the circulating flow guide tube (6).

4. The separation method of the two-phase cyclone separator according to claim 2 or 3, characterized in that, The ratio of the flow rate of the circulating flow to the flow rate of the fluid entering the hydrocyclone inlet (4) is 0.01~0.2, the average particle size of the particles carried by the fluid is not greater than 5 mm, and the particle volume fraction is not greater than 25%.

5. The separation method of the two-phase cyclone separator according to claim 2, characterized in that, The separation method is used to separate gas-solid two-phase flow or liquid-solid two-phase flow.

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