Centrifugal gravity coupling type liquid-liquid phase splitter

Abstract

The invention relates to a centrifugal gravity coupling type liquid-liquid phase splitter which comprises an upper end socket, a cylinder and a lower end socket which are sequentially and coaxially connected from top to bottom, a heavy-phase weir plate and a light-phase weir plate are arranged in the cylinder, the light-phase weir plate is arranged above the heavy-phase weir plate, the light-phase weir plate is of a structure with a wide upper part and a narrow lower part as a whole, and the heavy-phase weir plate is of a structure with a narrow upper part and a wide lower part as a whole. The lower end of the light-phase weir plate is matched and butted with the upper end of the heavy-phase weir plate, and a communicating hole is formed at the joint; a light-phase separation hole channel is formed in one end part, close to the communicating hole, of the light-phase weir plate; a heavy-phase separation hole channel is formed in one end part, close to the cylinder body, of the heavy-phase weir plate; a feeding pipe is arranged on the side wall of the part, between the light-phase weir plate and the heavy-phase weir plate, of the cylinder body; the axis direction of the feeding pipe is tangent to the circumferential direction of the cylinder body; and guide vanes are arranged on the inner wall of the part, between the light-phase weir plate and the heavy-phase weir plate, of the cylinder body. The phase-splitting device has the beneficial effects of simple and compact structure, high phase-splitting efficiency, high phase-splitting purity and low cost.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid-liquid separation, in particular to a centrifugal gravity coupled liquid-liquid phase separator. Background Art

[0002] Absorption heat pumps are heat recovery systems that use heat as their driving energy. They are divided into two types: first- and second-type absorption heat pumps. First-type absorption heat pumps, also known as heat-increasing heat pumps, utilize a high-temperature heat source to raise the energy of a low-temperature heat source to a medium temperature, thereby improving energy utilization efficiency. Second-type absorption heat pumps, also known as temperature-raising heat pumps, utilize the thermal potential difference between a large amount of intermediate waste heat and the low-temperature heat source to produce heat with a lower heat content but a higher temperature than the intermediate waste heat, thereby improving the quality of some of the waste heat.

[0003] Chinese patent CN118499987A discloses a new second-type absorption heat pump system based on liquid-liquid phase separation, and constructs a new heat pump circulation system based on liquid-liquid phase separation technology. This circulation system breaks the limitations of existing reverse Carnot cycle heat pump systems, such as their dependence on high-grade energy and difficulty in operating efficiently under conditions of large temperature differences. It enriches the theoretical system of heat pump technology and provides a new direction for the development and expansion of new heat pumps.

[0004] Traditional single-stage liquid-liquid separation equipment mostly uses gravity sedimentation or centrifugal liquid-liquid separation methods. Traditional gravity sedimentation liquid-liquid separation equipment and centrifugal liquid-liquid separation equipment (also known as cyclones) rely on the density difference between the two phases to achieve separation. This type of single-stage phase separation equipment will have the problem of fluid turbulence during the liquid separation process. Fluid turbulence can significantly destabilize the phase interface. The reason is that the Marangoni effect induced by turbulence causes random fluctuations in the interface. When two partially miscible liquids are in a turbulent state, local temperature fluctuations or differences in solute concentration can lead to uneven distribution of surface tension at the phase interface. High surface tension areas exert a pulling force on low surface tension areas, forming spontaneous convection cycles. This effect manifests itself in traditional phase separation equipment as violent disturbances of the phase interface. Irregular vortices and wrinkles appear at the interface between the two phases, which should have been clearly separated. These dispersed phase droplets are repeatedly pulled and broken, forming dispersed droplets with diameters of 10 to 500 μm. These droplets are difficult to quickly coalesce due to Brownian motion, and some are entrained into the target phase solution. The critical fluctuations caused by turbulence can lead to increased structural heterogeneity in the dispersed phase, forming an emulsion layer that is difficult to break, ultimately reducing the purity of the separated phase solution.

[0005] In addition, for gravity sedimentation liquid-liquid phase separators, a long solution residence time is required during liquid separation, resulting in a large system tank volume. That is, a sufficiently large equipment volume is required in exchange for the solution residence time in the phase separator, thereby achieving the ideal phase separation effect. The large tank volume not only occupies a large space, but also leads to a large amount of system working fluid usage, which leads to a significant increase in cost. In addition, the phase separation of gravity sedimentation liquid-liquid phase separators requires a long solution residence time. In order to avoid turbulent disturbances, intermittent operation must be adopted, which affects the continuous phase separation capability of the phase separator. For gravity sedimentation liquid-liquid phase separators, there is a free liquid surface inside, and the solution in the phase separator is not under external pressure. In thermal systems, materials need to be processed continuously, so a constant liquid level height must be maintained by overflow to ensure the stability of the separation interface. Therefore, the system also needs to pressurize the outflow solution, requiring two additional booster pumps, which will also increase the complexity and cost of the equipment.

[0006] The centrifugal liquid-liquid phase separator has a rotor inside and a drive motor outside, which means that additional rotating parts are required to generate centrifugal force. The system has high energy consumption and high equipment complexity.

[0007] In summary, the existing technology has the following problems: 1) Traditional single-stage liquid-liquid phase separators have the problem of turbulent disturbance, which will lead to a decrease in the purity of the target phase solution.

[0008] 2) Traditional gravity sedimentation liquid-liquid phase separators require a large tank filling volume, resulting in a large space occupation and a large amount of system working fluid usage, which leads to a significant increase in cost. In order to avoid turbulent disturbances, intermittent operation is required, which affects the continuous phase separation capability of the phase separator. To achieve continuous phase separation, additional boosting equipment is required, which increases the complexity and cost of the equipment.

[0009] 3) Traditional centrifugal liquid-liquid phase separators require additional rotating parts to generate centrifugal force, resulting in high system energy consumption and high equipment complexity. Summary of the Invention

[0010] The present invention is intended to provide a centrifugal gravity coupled liquid-liquid phase separator to solve the deficiencies in the prior art. The technical problems to be solved by the present invention are achieved through the following technical solutions.

[0011] A centrifugal gravity-coupled liquid-liquid phase separator, comprising an upper head, a cylinder and a lower head, wherein the upper head, the cylinder and the lower head are coaxially connected in sequence from top to bottom; a heavy phase weir plate and a light phase weir plate are arranged in the cylinder, the light phase weir plate is arranged above the heavy phase weir plate, the light phase weir plate is a structure that is wide at the top and narrow at the bottom as a whole, and the heavy phase weir plate is a structure that is narrow at the top and wide at the bottom as a whole, the lower end of the light phase weir plate and the upper end of the heavy phase weir plate are matched and docked with each other, and a connecting hole is formed at the connection so that the upper cavity of the light phase weir plate is connected to the lower cavity of the heavy phase weir plate; a light phase separation channel is provided at one end of the light phase weir plate close to the connecting hole, A heavy phase separation channel is provided at one end of the heavy phase weir plate close to the cylinder; a feed pipe is provided on the side wall of the cylinder located between the light phase weir plate and the heavy phase weir plate, and the axial direction of the feed pipe is tangent to the circumferential direction of the cylinder; a guide vane is provided on the inner wall of the cylinder located between the light phase weir plate and the heavy phase weir plate; a light phase liquid collecting chamber is provided at the upper end of the upper head, a light phase packing layer is provided at the bottom of the light phase liquid collecting chamber, and a light phase discharge pipe is connected to the upper end; a heavy phase liquid collecting chamber is provided at the lower end of the lower head, a heavy phase liquid collecting chamber is provided at the top of the heavy phase packing layer, and a heavy phase discharge pipe is connected to the lower end.

[0012] Preferably, a light phase rectifying plate is provided in the cylinder above the light phase weir plate, and a heavy phase rectifying plate is provided in the cylinder below the heavy phase weir plate.

[0013] Preferably, the light phase rectifying plate and / or the heavy phase rectifying plate is a porous plate structure or a grid plate structure.

[0014] Preferably, an anti-vortex plate is provided in the connecting hole.

[0015] Preferably, the anti-vortex plate is a cross plate or a Pozidriv plate, and the flow direction thereof is parallel to the axial direction of the connecting hole.

[0016] Preferably, the upper head is in the shape of a cone that is narrow at the top and wide at the bottom, and the lower head is in the shape of an inverted cone that is wide at the top and narrow at the bottom.

[0017] Preferably, the upper head and the lower head are cylindrical.

[0018] Preferably, the angle between the light phase weir plate and the horizontal plane is 10° to 80°.

[0019] Preferably, the angle between the heavy phase weir plate and the horizontal plane is 10° to 80°.

[0020] Preferably, the light phase weir plate and the heavy phase weir plate are continuous smooth plate structures or stepped plate structures.

[0021] The centrifugal gravity-coupled liquid-liquid phase separator provided by the present invention has the following beneficial effects: 1) The centrifugal phase separation method and the gravity sedimentation phase separation method were coupled in series, and the interior of the phase separator was divided into a centrifugal zone, a gravity sedimentation zone, and a clarification zone. Each zone was relatively independent of each other through physical isolation, realizing two-stage separation of centrifugal phase separation and gravity phase separation. The solution in each zone can achieve two-phase separation in a relatively stable flow field, avoiding backmixing of the separated solutions.

[0022] 2) Improving separation purity through secondary phase separation eliminates the need to increase equipment volume, reduces space occupied, saves working fluid usage, and thus saves costs.

[0023] 3) The setting of separation channels on the weir plate in the centrifugal zone achieves the primary separation of light and heavy phase solutions. After separation, the light phase solution and heavy phase solution still contain a small amount of separation phase solution, and turbulent disturbance problems may still exist. However, after entering the gravity sedimentation zone, since the content of the separation phase solution is very low, there will be no drastic material exchange during the secondary phase separation in the gravity sedimentation zone, that is, the intensity of the microscopic fluctuation of the phase separation is reduced, thereby greatly improving the separation efficiency and separation purity of the phase separator.

[0024] 4) The structure is simple and compact. The rotational power of the solution in the centrifugal zone and the circulation power of the solution are derived from the kinetic energy of the tangential feed. No additional rotating parts are required, which reduces energy consumption and equipment complexity, thereby reducing equipment costs.

[0025] 5) There is no free liquid surface inside the phase separator, which can realize pressurized continuous phase separation operation, effectively improving the separation efficiency of the phase separator. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic structural diagram of an embodiment of the present invention; Figure 2 Schematic diagram of the structure of an embodiment of the light phase weir plate in the present invention; Figure 3 Schematic diagram of the structure of an embodiment of the heavy phase weir plate in the present invention; Figure 4 Schematic diagram of the structure of an embodiment of the vortex prevention plate of the present invention; Figure 5 This is a schematic structural diagram of the solution flow in one embodiment of the present invention; Figure 6 is a schematic structural diagram of another embodiment of the present invention; Figure 7 Schematic diagram of the structure of another embodiment of the present invention; The reference numerals in the accompanying drawings are: 1. upper head, 2. cylinder, 3. lower head, 4. heavy phase packing layer, 5. heavy phase liquid collecting chamber, 6. heavy phase discharge pipe, 7. heavy phase rectifier plate, 8. heavy phase weir plate, 81. heavy phase separation channel, 9. feed pipe, 10. light phase weir plate, 101. light phase separation channel, 11. light phase rectifier plate, 12. light phase packing layer, 13. light phase liquid collecting chamber, 14. light phase discharge pipe, 15. connecting hole, 16. anti-vortex plate, 17. guide vane. DETAILED DESCRIPTION

[0027] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0028] Example 1: A centrifugal gravity coupled liquid-liquid phase separator, the improvement of which is that it includes an upper head 1, a cylinder 2 and a lower head 3, the upper head 1, the cylinder 2 and the lower head 3 are coaxially connected in sequence from top to bottom; a heavy phase weir plate 8 and a light phase weir plate 10 are arranged in the cylinder 2, the light phase weir plate 10 is arranged above the heavy phase weir plate 8, the light phase weir plate 10 is a structure that is wide at the top and narrow at the bottom, and the heavy phase weir plate 8 is a structure that is narrow at the top and wide at the bottom, the lower end of the light phase weir plate 10 and the upper end of the heavy phase weir plate 8 are matched and docked with each other, and a connecting hole 15 is formed at the connection so that the upper cavity of the light phase weir plate 10 is connected to the lower cavity of the heavy phase weir plate 8; a light phase separation channel 1 is provided at one end of the light phase weir plate 10 near the connecting hole 15 01, the heavy phase weir plate 8 is provided with a heavy phase separation channel 81 at one end near the cylinder 2; a feed pipe 9 is provided on the side wall of the cylinder 2 located between the light phase weir plate 10 and the heavy phase weir plate 8, and the axial direction of the feed pipe 9 is tangent to the circumferential direction of the cylinder 2; a guide vane 17 is provided on the inner wall of the cylinder 2 located between the light phase weir plate 10 and the heavy phase weir plate 8; a light phase liquid collecting chamber 13 is provided at the upper end of the upper head 1, a light phase packing layer 12 is provided at the bottom of the light phase liquid collecting chamber 13, and a light phase discharge pipe 14 is connected to the upper end, and a heavy phase liquid collecting chamber 5 is provided at the lower end of the lower head 3, a heavy phase liquid collecting chamber 5 is provided at the top of the heavy phase packing layer 4, and a heavy phase discharge pipe 6 is connected to the lower end.

[0029] In this embodiment, refer to Figures 1 to 7As shown, the heavy phase weir plate 8 has a conical structure that is narrow at the top and wide at the bottom, and the light phase weir plate 10 has an inverted conical structure that is wide at the top and narrow at the bottom. The lower edge of the heavy phase weir plate 8 is coaxially connected to the inner wall of the cylinder 2, and the upper inner edge of the heavy phase weir plate 8 is in the shape of a circular hole. The upper edge of the light phase weir plate 10 is coaxially connected to the inner wall of the cylinder 2, and the lower inner edge of the light phase weir plate 10 and the upper inner edge of the heavy phase weir plate 8 match and butt against each other. The inner wall of the cylinder 2, the upper wall of the heavy phase weir 8, and the lower wall of the light phase weir 10 enclose a centrifugal zone with a shape complementary to the hourglass, serving as the first phase separation stage of the phase separator. The cavity enclosed by the inner wall of the upper head 1, the inner wall of the cylinder 2, and the upper wall of the light phase weir 10 serves as the gravity settling zone for the light phase solution. The cavity enclosed by the lower wall of the heavy phase weir 8, the inner wall of the cylinder 2, and the inner wall of the lower head 3 serves as the gravity settling zone for the heavy phase solution. The gravity settling zones for the light phase solution and the heavy phase solution serve as the second phase separation stage of the phase separator. The light phase separation channel 101 is located below the light phase weir 10, and the heavy phase separation channel 81 is located below the heavy phase weir 8. There can be one or more feed pipes 9, all of which are tangential to the circumference of the cylinder 2.

[0030] In this embodiment, when the phase separator is operating, the mixed liquid enters the centrifugal zone at a certain speed through the tangential feed pipe 9 and rotates at high speed within the centrifugal zone along the guide vanes 17. Under the action of centrifugal force, the denser heavy phase solution in the mixed liquid moves toward the wall of the cylinder 2, while the lighter phase solution with lower density moves toward the axis of the cylinder 2. The centrifugal force generated by the solution rotation achieves primary separation of the mixed liquid.

[0031] After the first-stage separation, the light phase solution is collected at the axial center of the cylinder 2, and enters the upper light phase gravity sedimentation zone through the light phase separation channel opened on the light phase weir plate 10. When the light phase solution rises along the upper surface of the light phase weir plate 10, the rising flow rate in the gradually expanding light phase gravity sedimentation zone continues to decrease, and the flow gradually becomes uniform and stable, effectively avoiding the problems of turbulence, vortex and solution backmixing; during the rising process of the light phase solution, the small amount of heavy phase droplets remaining in the solution continue to settle to the upper surface of the light phase weir plate 10 under the action of gravity, and gather to the center position along the upper surface of the light phase weir plate 10, and enter the lower heavy phase gravity sedimentation zone through the connecting hole 15; the light phase solution passes through the light phase packing layer 12 to completely separate the small amount of heavy phase droplets entrained in the solution and enter the light phase collecting chamber 13, and is discharged through the light phase discharge pipe 14. The light phase collecting chamber 13 serves as the clarification area of ​​the light phase solution.

[0032] The heavy phase solution after the primary separation moves toward the wall of the cylinder 2, and enters the heavy phase gravity sedimentation zone below the heavy phase weir plate 8 through the heavy phase separation channel 81 opened at the lower end of the heavy phase weir plate 8, and gradually and steadily flows downward in the gradually expanding heavy phase gravity sedimentation zone. The small amount of light phase solution remaining in the heavy phase solution gradually floats upward to the lower surface of the heavy phase weir plate 8 due to its low density, and gradually gathers to the center position along the lower surface of the heavy phase weir plate 8, and then enters the upper light phase gravity sedimentation zone through the connecting hole 15; the heavy phase solution passes through the heavy phase packing layer 4 to completely separate the small amount of light phase droplets entrained therein, and then enters the heavy phase liquid collecting chamber 5, and is discharged from the heavy phase discharge pipe 6. The heavy phase liquid collecting chamber 5 serves as the clarification zone of the heavy phase solution.

[0033] The present embodiment provides a centrifugal gravity coupled liquid-liquid phase separator, which couples the centrifugal phase separation method with the gravity sedimentation phase separation method in series, and divides the interior of the phase separator into a centrifugal zone, a gravity sedimentation zone, and a clarification zone. The zones are relatively independent of each other through physical isolation, realizing two-stage separation of centrifugal phase separation and gravity phase separation, so that the solution in each zone can achieve two-phase separation in a relatively stable flow field, avoiding the back mixing of the separated solution. By improving the separation purity through secondary phase separation, there is no need to increase the volume of the equipment, reduce the occupied space, save the amount of working fluid used, and thus save costs. By setting the separation channel on the weir plate of the centrifugal zone, the first-level separation of the light and heavy phase solutions is achieved. The light phase solution and the heavy phase solution after separation still contain a small amount of the separated phase solution, and there may still be turbulent disturbance problems. However, after entering the gravity sedimentation zone, since the content of the separated phase solution is very low, there will be no violent material exchange during the secondary phase separation in the gravity sedimentation zone, that is, the intensity of the microscopic fluctuation of the phase separation is reduced, thereby greatly improving the separation efficiency and separation purity of the phase separator. The structure is simple and compact. The rotational power of the solution in the centrifugal zone and the circulation power of the solution are derived from the kinetic energy of the tangential feed. No additional rotating parts are required, which reduces energy consumption and equipment complexity, thereby reducing equipment costs. There is no free liquid surface inside the phase separator, which can achieve pressurized continuous phase separation operation, effectively improving the separation efficiency of the phase separator.

[0034] Furthermore, the diameter of the light phase liquid collecting chamber 13 is smaller than the diameter of the cylinder 2 .

[0035] Furthermore, the diameter of the heavy phase liquid collecting chamber 5 is smaller than the diameter of the cylinder 2 .

[0036] Further, refer to Figure 2 As shown, the light phase separation channels 101 are distributed in a ring array along the axis of the light phase weir plate 10 .

[0037] Further, refer to Figure 3 As shown, the heavy phase separation channels 81 are distributed in a ring array along the axis of the heavy phase weir plate 8 .

[0038] Furthermore, the guide blades 17 are of annular structure or spiral strip structure.

[0039] Furthermore, the guide blades 17 are of equal-width strip structures or unequal-width strip structures. The provision of the guide blades 17 can increase the residence time of the heavy phase solution during the centrifugal vortex.

[0040] Furthermore, the width of the guide blade 17 is 0.1R-0.3R, and the diameter of the connecting hole 15 is 0.1R-0.5R, wherein R is the radius of the cylinder 2 .

[0041] Furthermore, the angle between the light phase weir plate 10 and the horizontal plane is 10° to 80°.

[0042] Furthermore, the angle between the heavy phase weir plate 8 and the horizontal plane is 10° to 80°.

[0043] Example 2: On the basis of Example 1, a light phase rectifying plate 11 is provided above the light phase weir plate 10 in the cylinder 2 , and a heavy phase rectifying plate 7 is provided below the heavy phase weir plate 8 in the cylinder 2 .

[0044] In this implementation, refer to Figure 1 As shown, the setting of the light phase rectifier plate 11 and the heavy phase rectifier plate 7 plays the role of equalizing pressure and stabilizing flow, which can reduce the turbulence level of the light-rich solution in the light phase gravity sedimentation zone during the rising process, so as to reduce the turbulence level of the heavy-rich solution in the heavy phase gravity sedimentation zone during the descending process, thereby further improving the separation purity.

[0045] Furthermore, the light phase rectifying plate 11 and / or the heavy phase rectifying plate 7 is a porous plate structure or a grid plate structure.

[0046] Furthermore, an anti-vortex plate 16 is provided in the connecting hole 15 .

[0047] In this embodiment, the anti-vortex plate 16 is provided to avoid vortex and turbulence when the light and heavy residual liquids flowing upward and downward are exchanged.

[0048] Further, refer to Figure 4 As shown, the anti-vortex plate 16 is a cross plate or a Pozidriv plate, and its flow channel direction is parallel to the axial direction of the connecting hole 15.

[0049] Example 3: On the basis of Example 1 or 2, the upper head 1 is a cone with a narrow upper portion and a wide lower portion, and the lower head 3 is an inverted cone with a wide upper portion and a narrow lower portion.

[0050] In this embodiment, refer to Figure 1 and Figure 5As shown, the conical upper head 1 and lower head 3 make the flow channel gradually shrink when the light phase solution rises and the heavy phase solution falls in the gravity sedimentation zone, so that after the light phase solution enters the upper head 1 and the heavy phase solution enters the lower head 3, the flow rate of the mainstream solution is accelerated to a certain extent, thereby facilitating the discharge of each phase solution.

[0051] Example 4: Based on Example 1 or 2, the upper head 1 and the lower head 3 are cylindrical.

[0052] In this embodiment, refer to Figure 6 As shown, the arrangement of the cylindrical upper head 1 and the lower head 3 ensures that there is no tapered section flow channel after the light phase solution in the gravity sedimentation zone enters the upper head 1 section and the heavy phase solution enters the lower head 3 section, so that the solution flow rate is uniform and there is no acceleration process. Since the light phase solution and the heavy phase solution in the gravity sedimentation zone are both entrained with a small amount of separation phase solution, if the speed is too fast, it will be detrimental to the separation of the residual liquid. The arrangement of the cylindrical upper head 1 and the lower head 3 is more conducive to the separation of the residual liquid, thereby improving the separation purity.

[0053] The upper head 1 and the lower head 3 are conical or cylindrical, and are selected according to the specific density of the mixed solution and the density difference between the light and heavy phases, so as to achieve the best separation efficiency and purity.

[0054] Example 5: Based on Example 4, this example takes a mixed solution of n-butanol and water as an example, wherein the volume content of n-butanol is about 10%. Under normal temperature conditions, n-butanol and water are partially miscible, and the density of n-butanol is about 800 kg / m 3 , the density of water is about 1000kg / m 3 In traditional gravity phase separation equipment, n-butanol is easily affected by the volume content, Marangoni effect and fluid turbulence disturbance factors, and forms a large number of fine dispersed droplets of n-butanol, which affects the phase purity and separation efficiency.

[0055] In this embodiment, both the upper head 1 and the lower head 3 are cylindrical heads. Considering the small volume flow rate of n-butanol, the light phase weir plate 10 of this embodiment is arranged at an angle of 10° with the horizontal plane, and the heavy phase weir plate 8 is arranged at an angle of 30° with the horizontal plane, so as to increase the retention volume of the heavy phase solution in the centrifugal zone. In addition, the cross-sectional ratio of the light phase separation channel 101 provided by the light phase weir plate 10 to the heavy phase separation channel 81 provided by the heavy phase weir plate 8 is approximately 1:9. The guide vanes 17 are circular guide vanes of unequal height to increase the residence time of the heavy phase vortex.

[0056] This embodiment achieves efficient separation of a small flow rate of n-butanol aqueous solution by changing the inclination angles of the light phase weir plate and the heavy phase weir plate, as well as the cross-sectional configuration ratio of the light phase separation channel and the heavy phase separation channel. Tests have shown that the two-phase separation efficiency can reach over 98%.

[0057] Example 6: On the basis of any one of Examples 1-4, the light phase weir plate 10 and the heavy phase weir plate 8 are continuous smooth plate structures or stepped plate structures.

[0058] In this embodiment, refer to Figure 7 As shown, the light phase weir plate 10 and the heavy phase weir plate 8 are set as a stepped plate structure, which can increase the fluid residence time in the first phase separation stage, increase the flow Reynolds number of the higher viscosity phase solution during centrifugal rotation, and improve the separation purity of the first-stage centrifugal phase separation.

[0059] In this embodiment, taking the separation of two-phase solutions with similar density and one phase having higher viscosity as an example, the heavy phase weir plate 8 and the light phase weir plate 10 are both stepped conical weir plates, and the height of the cylinder 2 is adjusted to increase the spatial proportion of the secondary gravity sedimentation phase separation zone.

[0060] This embodiment increases the fluid residence time in the first phase separation stage through the stepped weir plate, increases the flow Reynolds number during the centrifugal cyclone process of the higher viscosity phase solution, and improves the separation purity of the first-stage centrifugal phase separation; by increasing the ratio of the secondary gravity sedimentation space, the residence time of the light and heavy phase solutions during the gravity sedimentation process is increased, thereby improving the separation purity of the secondary gravity sedimentation.

[0061] It should be noted that the above detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which this application belongs.

[0062] It should be noted that the terms used herein are intended only to describe specific embodiments and are not intended to limit the exemplary embodiments described herein. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0063] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0064] In addition, the terms "comprises" and "comprising" and any variations thereof are intended to cover a non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, product, or apparatus.

[0065] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be subsequently positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways, such as rotated 90 degrees or in other orientations, and the spatially relative descriptions used herein are interpreted accordingly.

[0066] In the above detailed description, reference is made to the accompanying drawings, which form a part hereof. In the drawings, similar symbols typically identify similar components, unless the context dictates otherwise. The illustrated embodiments described in the detailed description, drawings, and claims are not meant to be limiting. Other embodiments may be used, and other changes may be made, without departing from the spirit or scope of the subject matter presented herein.

[0067] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A centrifugal gravity coupled liquid-liquid phase separator, characterized in that: The invention comprises an upper end cap (1), a cylinder (2) and a lower end cap (3), wherein the upper end cap (1), the cylinder (2) and the lower end cap (3) are coaxially connected in sequence from top to bottom; a heavy phase weir plate (8) and a light phase weir plate (10) are arranged in the cylinder (2), the light phase weir plate (10) is arranged above the heavy phase weir plate (8), the light phase weir plate (10) is a structure that is wide at the top and narrow at the bottom, and the heavy phase weir plate (8) is a structure that is narrow at the top and wide at the bottom; the lower end of the light phase weir plate (10) and the upper end of the heavy phase weir plate (8) are matched and connected to each other, and a connecting hole (15) is formed at the connection so that the upper cavity of the light phase weir plate (10) is connected to the lower cavity of the heavy phase weir plate (8); a light phase separation channel (101) is provided at one end of the light phase weir plate (10) close to the connecting hole (15), and the heavy phase weir plate (8) is close to the connecting hole (15). A heavy phase separation channel (81) is provided near one end of the cylinder (2); a feed pipe (9) is provided on the side wall of the cylinder (2) located between the light phase weir plate (10) and the heavy phase weir plate (8), and the axial direction of the feed pipe (9) is tangent to the circumferential direction of the cylinder (2); a guide vane (17) is provided on the inner wall of the cylinder (2) located between the light phase weir plate (10) and the heavy phase weir plate (8); a light phase liquid collecting chamber (13) is provided at the upper end of the upper head (1), a light phase packing layer (12) is provided at the bottom of the light phase liquid collecting chamber (13), and a light phase discharge pipe (14) is connected to the upper end; a heavy phase liquid collecting chamber (5) is provided at the lower end of the lower head (3), a heavy phase packing layer (4) is provided at the top of the heavy phase liquid collecting chamber (5), and a heavy phase discharge pipe (6) is connected to the lower end.

2. The centrifugal gravity coupled liquid-liquid phase separator according to claim 1, characterized in that: A light phase rectifying plate (11) is provided in the cylinder (2) above the light phase weir plate (10), and a heavy phase rectifying plate (7) is provided in the cylinder (2) below the heavy phase weir plate (8).

3. The centrifugal gravity coupled liquid-liquid phase separator according to claim 2, characterized in that: The light phase rectifying plate (11) and / or the heavy phase rectifying plate (7) are of a porous plate structure or a grid plate structure.

4. The centrifugal gravity coupled liquid-liquid phase separator according to claim 1, characterized in that: An anti-vortex plate (16) is provided in the connecting hole (15).

5. The centrifugal gravity coupled liquid-liquid phase separator according to claim 4, characterized in that: The anti-vortex plate (16) is a cross plate or a rice plate, and its flow channel direction is parallel to the axial direction of the connecting hole (15).

6. The centrifugal gravity-coupled liquid-liquid phase separator according to claim 1, characterized in that: The upper head (1) is in the shape of a cone that is narrow at the top and wide at the bottom, and the lower head (3) is in the shape of an inverted cone that is wide at the top and narrow at the bottom.

7. The centrifugal gravity-coupled liquid-liquid phase separator according to claim 1, characterized in that: The upper head (1) and the lower head (3) are cylindrical.

8. The centrifugal gravity-coupled liquid-liquid phase separator according to claim 1, characterized in that: The angle between the light phase weir plate (10) and the horizontal plane is 10° to 80°.

9. The centrifugal gravity-coupled liquid-liquid phase separator according to claim 1, characterized in that: The angle between the heavy phase weir plate (8) and the horizontal plane is 10° to 80°.

10. The centrifugal gravity coupled liquid-liquid phase separator according to claim 1, characterized in that: The light phase weir plate (10) and the heavy phase weir plate (8) are continuous smooth plate structures or stepped plate structures.

Images