extraction column

Abstract

The application relates to the technical field of mass transfer separation, and discloses an extraction column, which comprises a column body and a tray assembly. The column body is provided with opposite first and second ends along the axial direction. The tray assembly is arranged in the column body and comprises a plate body, first blades and a filter screen. The plate body is provided with a through hole, and the side of the plate body facing the first end of the column body is provided with flow guide grooves. The flow guide grooves are arranged in a plurality of groups and are distributed along the circumferential direction of the through hole. The filter screen is arranged on the side of the plate body facing the second end of the column body. The first blades are arranged in a plurality of groups and are distributed along the circumferential direction of the through hole. Two adjacent first blades form a flow guide area, and the plurality of flow guide grooves are arranged in one-to-one correspondence with the plurality of flow guide areas. The corresponding flow guide grooves and flow guide areas are in communication. The application can simplify the structure of the tray assembly and improve the mass transfer efficiency.

Description

Technical Field

[0001] This application relates to the field of mass transfer and separation technology, specifically to an extraction tower. Background Technology

[0002] As a core piece of equipment in chemical separation processes, the mass transfer efficiency and operational stability of liquid-liquid extraction towers directly impact production efficiency and operating costs. Traditional tower internals (such as sieve plates, packing, or rotating discs) primarily rely on gravity distribution or mechanical shearing to promote the dispersion and contact of the two phases. However, when processing high-viscosity, solid-containing, or easily emulsified systems, they generally face problems such as insufficient mass transfer area and uneven flow, limiting tower volume utilization and separation accuracy. Improving the uniformity of dispersed phase droplets and the interphase mass transfer surface area is key to enhancing the efficiency of the extraction process.

[0003] In related technologies, in order to improve the dispersion and mass transfer performance of traditional tray assemblies, a multi-stage support structure with alternating combinations of tray assemblies and structured packing is generally adopted, or a dual-channel conical swirl element is designed, which can enhance fluid shear and radial distribution, expand the operating window and improve mass transfer intensity.

[0004] However, the components in related technologies are often structurally complex, with narrow flow channels and surfaces that are prone to material adhesion. Especially when processing materials containing solid particles or easily polymerizable impurities, internal blockage and scaling are likely to occur, leading to increased pressure drop, decreased throughput, and even the need for frequent shutdowns for cleaning, making it difficult to meet the requirements for long-term continuous operation. Summary of the Invention

[0005] This application provides an extraction tower to solve the problems of complex structure and low mass transfer efficiency.

[0006] This application provides an extraction column, comprising:

[0007] The tower body has a first end and a second end that are opposite each other along its axial direction;

[0008] A tray assembly, disposed within the tower body, includes a tray body, a first blade, and a filter screen;

[0009] The plate is provided with through holes, and the side of the plate facing the first end of the tower body is provided with guide grooves. There are multiple guide grooves, and the multiple guide grooves are distributed at intervals along the circumference of the through holes.

[0010] The filter screen is disposed on the side of the plate facing the second end of the tower body;

[0011] The first blade is provided in multiple ways, and the multiple first blades are distributed at intervals along the circumference of the through hole. A flow guiding area is formed between two adjacent first blades. The multiple flow guiding grooves are respectively provided in one-to-one correspondence with the multiple flow guiding areas, and the corresponding flow guiding grooves are connected to the flow guiding areas.

[0012] Beneficial effects: By incorporating a plate with flow channels, a first blade located within the through-holes, and a filter screen, the fluid is pre-distributed by the flow channels and guided to the flow-guiding area formed by the first blade as it passes through the tray assembly. This significantly enhances the mixing degree and contact area of ​​the two-phase fluids, thereby effectively improving mass transfer efficiency. The filter screen further promotes droplet breakage and uniform dispersion.

[0013] In one optional embodiment, the guide channel has a first side and a second side opposite to each other, the first side and the second side intersect in a direction away from the through hole, the depth of the guide channel gradually increases in a direction close to the through hole, the intersection of the first side and the second side is the intersection point, the intersection point and the axis of the through hole are both located on a first plane, and the first side and the second side are both located on the same side of the first plane.

[0014] Beneficial effects: By limiting the intersecting structure and depth variation of the guide channel, the flow path of the fluid and the hydrodynamic conditions when entering the through hole are optimized, so that the fluid can enter the guide area more smoothly and efficiently, reducing the flow dead zone and energy loss, and further improving the dispersion effect and mass transfer efficiency.

[0015] In one alternative embodiment, the tray assembly further includes:

[0016] A column is disposed within the through hole, and the axis of the column is parallel to the axis of the through hole;

[0017] The first blade is configured as a flat plate structure. The first blade has a first connecting end and a second connecting end opposite to each other. The first connecting end is connected to the column body, and the second connecting end is connected to the inner wall of the through hole. The direction from the first connecting end to the second connecting end is set at an angle with the radial direction of the through hole, and the connection interface between the first connecting end and the column body is on the outer wall of the column body, extending spirally along the axial direction of the column body.

[0018] Beneficial effects: By adding a column and setting the first blade as an inclined plate structure connected to the column and the through hole wall, a stable swirling channel is formed in the through hole, which effectively guides the fluid to generate swirling flow, enhances the turbulence intensity and droplet shearing and breaking effect, and improves the renewal rate of the mass transfer surface and the extraction reaction efficiency.

[0019] In one alternative embodiment, the tray assembly further includes:

[0020] A cover is disposed on the side of the plate facing the filter screen, the cover communicates with the through hole, and the cover is located between the filter screen and the plate;

[0021] The second blade is provided in multiples, and the multiple second blades are distributed at intervals along the circumference of the column. The multiple first blades are provided in the through hole near the first end of the tower body, and the multiple second blades are provided in the through hole near the second end of the tower body. The second blades are at least partially located in the cover body.

[0022] Beneficial effects: By setting up a cover and a second blade, the flow pattern is further constrained and guided after the fluid flows out of the through hole, so that the dispersed phase can achieve secondary mixing and refinement in the cover. The arrangement of the second blade enhances the dispersion effect and improves the dispersion performance and mass transfer intensity of the overall tray assembly.

[0023] In one optional embodiment, the cross-section of the cover perpendicular to the axis of the through hole is circular, and the area of ​​the cross-section of the cover perpendicular to the axis of the through hole gradually increases along the direction from the first end to the second end of the tower body.

[0024] Beneficial effects: By designing the cover as a structure with a gradually increasing cross-sectional area, smooth fluid diffusion and pressure recovery are achieved, effectively reducing local eddies and energy loss, allowing the fluid to enter the filter screen evenly, and improving the throughput of the tray assembly.

[0025] In one alternative embodiment, the filter screen is provided with a plurality of filter holes, and the diameter of each filter hole gradually increases along the direction from the center to the edge of the filter screen.

[0026] Beneficial effects: By setting the filter screen to a gradient structure with pore size gradually increasing from the center to the edge, it effectively intercepts particulate matter while avoiding local clogging and a sharp increase in pressure drop, balancing filtration accuracy and throughput requirements, and enhancing the anti-clogging ability and long-term operational stability of the tray assembly.

[0027] In one alternative embodiment, the tray assembly further includes:

[0028] A vibration module is disposed on the filter screen and connected to the filter screen.

[0029] Beneficial effects: By setting a vibration module on the filter screen, particulate matter can be effectively prevented from depositing and scaling on the screen surface, realizing online self-cleaning function, extending the cleaning cycle and maintenance interval, and is especially suitable for continuous and stable operation of systems with high solid content and easy clogging.

[0030] In one alternative embodiment, multiple tray assemblies are provided, and the multiple tray assemblies are spaced apart along the first end to the second end of the tower body.

[0031] Beneficial effects: By setting multiple tray assemblies along the axial direction of the tower body, multi-stage countercurrent extraction is achieved. Each stage can effectively enhance the dispersion and mass transfer process, thereby improving the overall separation efficiency and processing capacity of the tower.

[0032] In one alternative embodiment, the edges of both the filter screen and the plate are connected to the inner wall of the tower body, the filter screen is adapted to the inner wall of the tower body, and a channel is provided between the plate and the inner wall of the tower body.

[0033] Beneficial effects: By adapting and connecting the filter screen to the inner wall of the tower body and setting channels at the edge of the plate, a compact and well-sealed internal flow channel layout is formed, ensuring that the fluid passes through the tower plate assembly uniformly without short circuits. At the same time, it facilitates modular installation and maintenance, improving the overall reliability and economy of the equipment.

[0034] In one alternative implementation, the channels of two adjacent tray assemblies are located at opposite ends along the diameter of the tower body.

[0035] Beneficial effects: By alternating the channels of adjacent tray assemblies at both ends of the tower diameter, the fluid is guided to flow in a serpentine manner within the tower, enhancing the radial mixing and mass transfer driving force of the fluid, and effectively improving the tower capacity utilization and separation efficiency. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of the structure of an extraction tower according to an embodiment of this application;

[0038] Figure 2 This is a schematic diagram of the plate structure in an embodiment of this application;

[0039] Figure 3 for Figure 2 A magnified view of part A in the image;

[0040] Figure 4 This is a schematic diagram of the structure of the cover in an embodiment of this application;

[0041] Figure 5 for Figure 4 A magnified view of part B in the image;

[0042] Figure 6 This is a cross-sectional view of the tray assembly in an embodiment of this application;

[0043] Figure 7 for Figure 6 A magnified view of part C;

[0044] Figure 8 This is a schematic diagram of the vibration module in an embodiment of this application.

[0045] Explanation of reference numerals in the attached figures:

[0046] 1. Tower body; 101. First end; 102. Second end; 2. Tower plate assembly; 201. Plate; 2011. Through hole; 2012. Flow guide groove; 2013. First side; 2014. Second side; 2015. Intersection point; 202. First blade; 2021. First connecting end; 2022. Second connecting end; 203. Filter screen; 204. Flow guide area; 205. Column; 206. Cover; 207. Second blade; 3. Drive shaft; 4. Eccentric block; 5. Motor; 6. Channel. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0048] The following is combined Figures 1 to 8 This describes an embodiment of the present application.

[0049] According to an embodiment of this application, an extraction column is provided, including a column body 1 and a tray assembly 2. The column body 1 has a first end 101 and a second end 102 disposed opposite to each other along its axial direction. The tray assembly 2 is disposed within the column body 1 and includes a tray 201, a first blade 202, and a filter screen 203. The tray 201 has a through hole 2011, and a guide groove 2012 is provided on the side of the tray 201 facing the first end 101 of the column body 1. Multiple guide grooves 2012 are provided and are distributed circumferentially at intervals along the through hole 2011. The filter screen 203 is disposed on the side of the tray 201 facing the second end 102 of the column body 1. Multiple first blades 202 are provided, and the multiple first blades 202 are distributed circumferentially in the through hole 2011. A flow guiding area 204 is formed between two adjacent first blades 202. Multiple flow guiding grooves 2012 are respectively provided in correspondence with multiple flow guiding areas 204, and the corresponding flow guiding grooves 2012 are connected to the flow guiding area 204.

[0050] It should be noted that the first end 101 of the tower body 1 is the end closest to the ground, and the second end 102 is the end furthest from the ground; that is, the direction from the first end 101 to the second end 102 is perpendicular to the ground. The continuous phase enters the inner cavity of the tower body 1 from the top, and the dispersed phase enters the inner cavity of the tower body 1 from the bottom. The guide groove 2012 set on the bottom surface of the plate 201 can guide the dispersed phase in a directional manner, allowing the dispersed phase to flow into the through hole 2011, thereby controlling the liquid level on the plate 201 and preventing short-circuiting. Multiple first blades 202 set in the through hole 2011 form a swirling structure, which allows the fluid entering each guide area 204 through the guide groove 2012 to swirl, thereby colliding with the filter screen 203 in a swirling state and improving the dispersion effect.

[0051] It is understandable that the first blade 202 can be configured as an arc-shaped spiral blade structure or a flat plate structure. The spiral blade structure itself can achieve a swirling effect, and the flat plate structure can also achieve a swirling effect on the fluid by setting its specific tilt angle. The dispersed phase is guided by the guide channel 2012 into the guide region 204 to form a swirling flow, and then further cut and broken by the filter screen 203, promoting full mixing of the two phases, improving the separation efficiency of the extraction tower, significantly improving mass transfer efficiency, expanding the operating flexibility of the extraction tower and reducing energy consumption. It is suitable for high-difficulty separation and easily clogged scenarios such as petrochemical and environmental protection industries.

[0052] Optionally, multiple through holes 2011 can be provided on the plate 201, and multiple guide grooves 2012 can be provided around each through hole 2011. A first blade 202 and a second blade 207 and a corresponding cover 206 can be provided in each through hole 2011.

[0053] Optionally, the diameter of the through hole 2011 is 10 mm to 30 mm.

[0054] In this embodiment, by providing a plate 201 with a flow guide groove 2012, a first blade 202 located within a through hole 2011, and a filter screen 203, the fluid can be pre-distributed and guided by the flow guide groove 2012 to the flow guiding region 204 formed by the first blade 202 when passing through the tray assembly 2. This significantly enhances the mixing degree and contact area of ​​the two-phase fluid, thereby effectively improving the mass transfer efficiency. The filter screen 203 further promotes the breakup and uniform dispersion of droplets.

[0055] In one embodiment, the flow channel 2012 has a first side 2013 and a second side 2014 opposite to each other. The first side 2013 and the second side 2014 intersect in a direction away from the through hole 2011. The depth of the flow channel 2012 gradually increases in a direction close to the through hole 2011. The intersection of the first side 2013 and the second side 2014 is the intersection point 2015. The axis of the intersection point 2015 and the axis of the through hole 2011 are both located on the first plane. The first side 2013 and the second side 2014 are both located on the same side of the first plane.

[0056] It should be noted that the first side 2013 and the second side 2014 are both located on the same side of the first plane, such that the first side 2013 and the second side 2014 are set at an angle to the radial direction of the through hole 2011, so that the flow direction of the fluid flowing between the first side 2013 and the second side 2014 is set at an angle to the radius of the through hole 2011, and the angle between the angle bisector of the first side 2013 and the second side 2014 and the first plane is 5° to 30°.

[0057] Understandably, the flow channel 2012 is a structure on the plate 201. The plate 201 can be made of 316L stainless steel or polytetrafluoroethylene, with a thickness of 10mm to 20mm and corrosion resistance ≥ pH 2 to pH 12.

[0058] Optionally, multiple guide grooves 2012 are radially distributed with the center of each through hole 2011 as the center.

[0059] Optionally, three to six guide grooves 2012 may be provided around each through hole 2011.

[0060] Optionally, each guide channel 2012 has a width of 3mm to 6mm and a depth of 1mm to 3mm.

[0061] Optionally, the angle between the bisector of the angle between the first side 2013 and the second side 2014 and the first plane is 15°, which is applicable to systems with a viscosity of <50 mPa·s.

[0062] In this embodiment, by limiting the intersecting structure and depth variation of the side of the guide channel 2012, the flow path of the fluid and the hydrodynamic conditions when entering the through hole 2011 are optimized, so that the fluid can enter the guide region 204 more smoothly and efficiently, reducing the flow dead zone and energy loss, and further improving the dispersion effect and mass transfer efficiency.

[0063] In one embodiment, the tray assembly 2 further includes a column 205 disposed within a through hole 2011, the axis of the column 205 being parallel to the axis of the through hole 2011. The first blade 202 is configured as a flat plate structure, having a first connecting end 2021 and a second connecting end 2022. The first connecting end 2021 is connected to the column 205, and the second connecting end 2022 is connected to the inner wall of the through hole 2011. The direction from the first connecting end 2021 to the second connecting end 2022 forms an angle with the radial direction of the through hole 2011, and the connection interface between the first connecting end 2021 and the column 205 is on the outer wall of the column 205, spirally extending along the axial direction of the column 205.

[0064] It should be noted that the column 205, the first blade 202, and the second blade 207 are all welded structures, as are the first blade 202, the second blade 207, and the through hole 2011. By setting multiple first blades 202, the inner cavity of the through hole 2011 can be divided into multiple fan-shaped regions, which are the flow guiding regions 204. A tangential inlet is provided on the inner wall of the through hole 2011, which connects each flow guiding groove 2012 with each flow guiding region 204. When the flow in the flow guiding groove 2012 enters the flow guiding region 204 through the tangential inlet, it can achieve initial swirling. After entering the flow guiding region 204, under the guiding action of the first blade 202, it can achieve secondary swirling, thereby enhancing the swirling.

[0065] Optionally, the angle between the angle bisector between the first side surface 2013 and the second side surface 2014 and the first plane is equal to the angle between the tangential inlet and the radius of the through hole 2011.

[0066] In this embodiment, by adding a column 205 and setting the first blade 202 as an inclined plate structure connected to the column 205 and the wall of the through hole 2011, a stable swirling channel 6 is formed in the through hole 2011, which effectively guides the fluid to generate swirling flow, enhances the turbulence intensity and droplet shearing and breaking effect, and improves the renewal rate of the mass transfer surface and the extraction reaction efficiency.

[0067] In one embodiment, the tray assembly 2 further includes a cover 206 and second blades 207. The cover 206 is disposed on the side of the tray 201 facing the filter screen 203, and communicates with the through hole 2011. The cover 206 is located between the filter screen 203 and the tray 201. Multiple second blades 207 are provided, and the multiple second blades 207 are distributed circumferentially on the column 205. Multiple first blades 202 are disposed within the through hole 2011 near the first end 101 of the tray body 1, and multiple second blades 207 are disposed within the through hole 2011 near the second end 102 of the tray body 1. The second blades 207 are at least partially located within the cover 206.

[0068] It should be noted that the axis of the column 205 coincides with the plane where the second blade 207 is located, and the axis of the column 205 coincides with the axis of the through hole 2011. The multiple second blades 207 can play a preliminary role in dispersing the swirling flow, and the cover 206 can achieve a flow guiding effect, directing the fluid towards the filter plate for collision.

[0069] Optionally, a plurality of second blades 207 are equally spaced along the circumference of the column 205, and the included angle between two adjacent blades can be set to 30° to 45°.

[0070] In this embodiment, by setting the cover 206 and the second blade 207, the flow state is further constrained and guided after the fluid flows out of the through hole 2011, so that the dispersed phase can achieve secondary mixing and refinement in the cover 206. The arrangement of the second blade 207 enhances the dispersion effect and improves the dispersion performance and mass transfer intensity of the overall tray assembly 2.

[0071] In one embodiment, the cross-section of the cover 206 perpendicular to the axis of the through hole 2011 is circular, and the area of ​​the cross-section of the cover 206 perpendicular to the axis of the through hole 2011 gradually increases along the direction from the first end 101 to the second end 102 of the tower body 1.

[0072] In this embodiment, by designing the cover 206 as a structure with a gradually increasing cross-sectional area, smooth fluid diffusion and pressure recovery are achieved, effectively reducing local eddies and energy loss, enabling the fluid to enter the filter screen 203 uniformly, and improving the throughput of the tower plate assembly 2.

[0073] In one embodiment, the filter screen 203 is provided with a plurality of filter holes, and the diameter of each filter hole gradually increases along the direction from the center to the edge of the filter screen 203.

[0074] It should be noted that the aperture size of the filter holes increases gradually from the center of the tower body 1 towards the edge.

[0075] Optionally, the pore size of the filter holes located in the central area of ​​the filter plate is 0.1 mm to 0.5 mm, and the pore size of the filter holes located in the edge area of ​​the filter plate is 0.3 mm to 0.6 mm.

[0076] Optionally, the filter plate and the inner wall of the tower body 1 adopt a quick-release snap-fit ​​design, which can support the setting of reverse flushing with a flushing pressure of 0.2MPa to 0.5MPa.

[0077] In this embodiment, by setting the filter screen 203 as a gradient structure with the pore size gradually increasing from the center to the edge, local clogging and a sharp increase in pressure drop are avoided while effectively intercepting particulate matter. This balances the filtration accuracy and throughput requirements, and enhances the anti-clogging ability and long-term operational stability of the tray assembly 2.

[0078] In one embodiment, the tray assembly 2 further includes:

[0079] The vibration module is mounted on the filter screen 203 and connected to the filter screen 203.

[0080] It should be noted that the vibration module includes a vibration frame, an elastic support assembly, a drive shaft 3, an eccentric block 4, and a motor 5. The filter screen 203 is fixedly installed on the vibration frame. The elastic support assembly connects the vibration frame to the inner wall of the tower body 1, allowing the vibration frame to vibrate relative to the tower body 1. The drive shaft 3 is rotatably disposed within the vibration frame, with one end of the drive shaft 3 passing through both the vibration frame and the tower body 1. The eccentric block 4 is partially connected to the drive shaft 3 located within the vibration frame. The motor 5 is disposed on the outer wall of the tower body 1 and connected to the outer end of the drive shaft 3.

[0081] Alternatively, the drive shaft 3 can also be directly mounted on the filter screen 203, and the elastic support assembly can be connected between the filter screen 203 and the inner wall of the tower body 1.

[0082] Optionally, the vibration module has a frequency of 20Hz to 50Hz and an amplitude of 0.1mm to 0.4mm to prevent particle deposition.

[0083] In this embodiment, by setting a vibration module on the filter screen 203, particulate matter can be effectively prevented from depositing and scaling on the screen surface, realizing online self-cleaning function, extending the cleaning cycle and maintenance interval, and is especially suitable for continuous and stable operation of systems with high solid content and easy clogging.

[0084] In one embodiment, multiple tray assemblies 2 are provided, and the multiple tray assemblies 2 are distributed at intervals along the first end 101 to the second end 102 of the tower body 1.

[0085] In this embodiment, by arranging multiple tray assemblies 2 along the axial direction of the tower body 1, multi-stage countercurrent extraction is achieved. Each stage can effectively enhance the dispersion and mass transfer process, thereby improving the overall separation efficiency and processing capacity of the tower.

[0086] In one embodiment, the edges of both the filter screen 203 and the plate 201 are connected to the inner wall of the tower body 1, the filter screen 203 is adapted to the inner wall of the tower body 1, and there is a channel 6 between the plate 201 and the inner wall of the tower body 1.

[0087] In this embodiment, by adapting and connecting the filter screen 203 to the inner wall of the tower body 1 and setting the channel 6 at the edge of the plate 201, a compact and well-sealed internal flow channel layout is formed, which ensures that the fluid passes through the tower plate assembly 2 uniformly without short circuits. At the same time, it facilitates modular installation and maintenance, and improves the overall reliability and economy of the equipment.

[0088] In one embodiment, the channels 6 of two adjacent tray assemblies 2 are located at opposite ends along the diameter of the tower body 1.

[0089] In this embodiment, by alternately arranging the channels 6 of adjacent tray assemblies 2 at both ends of the tower diameter, the fluid is guided to flow in a serpentine manner within the tower, which enhances the radial mixing and mass transfer driving force of the fluid and effectively improves the tower capacity utilization and separation efficiency.

[0090] In one embodiment, the lubricating oil is deacidified and refined as follows:

[0091] 1. System and equipment configuration:

[0092] Extraction system: The continuous phase uses a base lubricating oil (viscosity 80 mPa·s, acid value 1.5 mg KOH / g). The dispersed phase uses a 15% (w / w) aqueous solution of ethanolamine (density 980 kg / m³). 3 (pH 9.5).

[0093] Extraction tower structure: The tower body 1 is made of 316L stainless steel, with a tower diameter of 1.5m and an effective tower height of 12m. The spacing between the tray assemblies 2 is 300mm. The number of tray assemblies 2 is 30 layers. There are 4 guide channels 2012, each 5mm wide and 4mm deep, with an inclination angle of 20°. The diameter of the through hole 2011 is 25mm, and the tangential inlet angle is 70°. The included angle between two adjacent second blades 207 is 30°, and the height of the second blade 207 is 4mm. The filter screen 203 has a central area aperture of 0.3mm and an edge area aperture of 1.5mm, and is made of 316L stainless steel.

[0094] 2. Operating Procedures:

[0095] S1: Two-phase feed and operation, the continuous phase (lubricating oil) enters from the top of the tower at a flow rate of 10 m³ / h. 3The flow rate is 6 m³ / h, and the temperature is controlled at 90±2℃. The dispersed phase (ethanolamine solution) enters from the bottom of the column at a flow rate of 6 m³ / h. 3 / h. The operating pressure is atmospheric pressure, and the pressure drop inside the tower is monitored in real time (differential pressure sensor accuracy ±0.1kPa).

[0096] S2: Self-cleaning maintenance. Backwashing is initiated every 24 hours. Specifically, the feed valve is closed, and 0.3 MPa nitrogen gas is introduced to backwash filter screen 203 from the bottom of the tower for 5 minutes. After rinsing, the pressure drop of filter screen 203 returns to its initial value (0.4 kPa).

[0097] 3. Experimental Results:

[0098] The acid value of the lubricating oil at the outlet decreased to 0.2 mg KOH / g, and the extraction rate was 93% (compared to 85% for traditional sieve tray towers). The mass transfer coefficient improved to 0.022 s⁻¹. -1 (Traditional trays have a time limit of 0.014s) -1 The pressure drop per plate is 0.6 kPa, and the total pressure drop is 18 kPa, which is 32% lower than that of traditional towers. The energy consumption per unit throughput is 0.18 kW·h / m³. 3 It saves 25% on energy.

[0099] After 500 hours of continuous operation, there was no obvious particle deposition on filter screen 203, and the pressure drop fluctuation was less than 5%.

[0100] In one embodiment, wastewater containing nano-TiO2 particles is treated as follows:

[0101] 1. System and Improvement Design:

[0102] Treatment target: Wastewater containing nano-TiO2 particles (50 nm in diameter, 3 wt%), pH 2.5, COD 1200 mg / L. Extraction phase: Compressed air (flow rate 8 Nm³ / h). 3 / h, pressure 0.4MPa).

[0103] Tower tray optimization: The filter screen 203 is made of titanium alloy (resistant to acid corrosion, increasing lifespan by 3 times). Vibration module parameters are 30Hz frequency and 0.2mm amplitude (to prevent nanoparticle agglomeration). The inclination angle of the guide channel 2012 is adjusted to 10° (suitable for low-viscosity wastewater).

[0104] 2. Operating conditions:

[0105] Wastewater enters from the top of the tower at a flow rate of 15m³. 3 / h, temperature 25℃. Air is introduced from the distributor at the bottom of the tower, with an initial bubble diameter of 2-3 mm. The process is repeated every 48 hours at a pressure of 0.4 MPa (the pickling solution is a 5% nitric acid solution).

[0106] 3. Treatment effect:

[0107] COD decreased from 1200 mg / L to 144 mg / L, with a removal rate of 88%. TiO2 particle rejection rate was >99.5%, and effluent turbidity was <10 NTU.

[0108] After 216 hours of continuous operation, the flux attenuation of filter screen 203 is less than 8%. The vibration module effectively inhibits scaling on the surface of tray assembly 2, extending the maintenance cycle to 4 times that of traditional equipment.

[0109] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and all such modifications and variations fall within the scope defined by the appended claims.

Claims

1. An extraction tower, characterized in that, include: The tower body (1) has a first end (101) and a second end (102) arranged along its axial direction. The first end (101) of the tower body (1) is the end close to the ground, and the second end (102) of the tower body (1) is the end away from the ground. The tray assembly (2) is disposed within the tower body (1) and includes a tray (201), a first blade (202) and a filter screen (203). The plate (201) is provided with a through hole (2011), and the side of the plate (201) facing the first end (101) of the tower body (1) is provided with a guide groove (2012). There are multiple guide grooves (2012), and the multiple guide grooves (2012) are distributed circumferentially at intervals along the through hole (2011). The filter screen (203) is disposed on the side of the plate (201) facing the second end (102) of the tower body (1); The first blade (202) is provided in multiple ways. The multiple first blades (202) are distributed circumferentially in the through hole (2011) and a flow guiding area (204) is formed between two adjacent first blades (202). The multiple flow guiding grooves (2012) are respectively provided in correspondence with the multiple flow guiding areas (204), and the corresponding flow guiding grooves (2012) are connected to the flow guiding areas (204). The flow channel (2012) has a first side (2013) and a second side (2014) opposite to each other. The first side (2013) and the second side (2014) intersect in a direction away from the through hole (2011). The depth of the flow channel (2012) gradually increases in the direction close to the through hole (2011). The intersection of the first side (2013) and the second side (2014) is the intersection point (2015). The axis of the intersection point (2015) and the through hole (2011) are both located on a first plane. The first side (2013) and the second side (2014) are both located on the same side of the first plane.

2. The extraction tower according to claim 1, characterized in that, The tray assembly (2) also includes: A column (205) is disposed within the through hole (2011), and the axis of the column (205) is parallel to the axis of the through hole (2011); The first blade (202) is configured as a flat plate structure. The first blade (202) has a first connecting end (2021) and a second connecting end (2022) opposite to each other. The first connecting end (2021) is connected to the column (205), and the second connecting end (2022) is connected to the inner wall of the through hole (2011). The direction from the first connecting end (2021) to the second connecting end (2022) is set at an angle with the radial direction of the through hole (2011). The connection interface between the first connecting end (2021) and the column (205) is on the outer wall of the column (205) and extends spirally along the axial direction of the column (205).

3. The extraction tower according to claim 2, characterized in that, The tray assembly (2) also includes: A cover (206) is disposed on the side of the plate (201) facing the filter (203), the cover (206) communicates with the through hole (2011), and the cover (206) is located between the filter (203) and the plate (201); Multiple second blades (207) are provided, and multiple second blades (207) are distributed circumferentially on the column (205). Multiple first blades (202) are provided in the through hole (2011) near the first end (101) of the tower body (1). Multiple second blades (207) are provided in the through hole (2011) near the second end (102) of the tower body (1). The second blades (207) are at least partially located in the cover (206).

4. The extraction tower according to claim 3, characterized in that, The cross-section of the cover (206) perpendicular to the axis of the through hole (2011) is circular, and the area of ​​the cross-section of the cover (206) perpendicular to the axis of the through hole (2011) gradually increases along the direction from the first end (101) to the second end (102) of the tower body (1).

5. The extraction tower according to claim 1, characterized in that, The filter screen (203) is provided with a plurality of filter holes, and the diameter of each filter hole gradually increases along the direction from the center to the edge of the filter screen (203).

6. The extraction tower according to claim 1, characterized in that, The tray assembly (2) also includes: A vibration module is disposed on the filter screen (203) and connected to the filter screen (203).

7. The extraction tower according to claim 1, characterized in that, Multiple tray assemblies (2) are provided, and the multiple tray assemblies (2) are distributed at intervals along the first end (101) to the second end (102) of the tower body (1).

8. The extraction tower according to claim 7, characterized in that, The edges of the filter screen (203) and the plate (201) are connected to the inner wall of the tower body (1). The filter screen (203) is adapted to the inner wall of the tower body (1). There is a channel (6) between the plate (201) and the inner wall of the tower body (1).

9. The extraction tower according to claim 8, characterized in that, The channels (6) of two adjacent tray assemblies (2) are located at opposite ends along the diameter of the tower body (1).

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