Dynamic cyclone oil-water separation regulation and control method based on curve diversion and parameter matching

Abstract

The invention discloses a dynamic rotational flow oil-water separation regulation and control method based on curve diversion and parameter matching. The method is used for a catering waste multi-stage collaborative separation system. The method comprises the steps that fed catering waste is crushed according to the feeding and crushing pretreatment module; performing solid-liquid separation on the crushed solid-liquid mixture according to a solid-liquid separation module to obtain an oil-containing liquid phase; meanwhile, separated solid residues are discharged from a solid-phase outlet in the solid-liquid separation module and fall into a food residue recycling box; carrying out thermal conditioning on the oil-containing liquid phase subjected to solid-liquid separation according to a thermal conditioning module; tangentially introducing the fluid subjected to thermal hardening and tempering into a straight cylinder type dynamic cyclone separation cavity of the dynamic cyclone separation core module; an external driving motor drives the straight-barrel-shaped dynamic cyclone separation cavity and the curve rotating grid fixedly connected into the straight-barrel-shaped dynamic cyclone separation cavity to rotate synchronously, the curve rotating grid is provided with guide vanes distributed in the circumferential direction, and three-dimensional space molded lines of the guide vanes are constructed based on a quadratic Bezier curve, so that introduced fluid is guided by the curve rotating grid to be in smooth transition; therefore, continuous gradually-changed tangential speed distribution is formed, and local shear stress of an inlet area is reduced.

Description

Technical Field

[0001] This invention relates to a dynamic swirling oil-water separation control method based on curve guidance and parameter matching, belonging to the field of multiphase flow separation and flow field control technology. Background Technology

[0002] With the rapid development of the catering industry, the amount of catering waste (including kitchen waste and oily wastewater) is increasing day by day. Such mixed systems usually exhibit a multiphase component coexistence state, characterized by high viscosity, obvious heterogeneity and easy emulsification. They often contain hard particles, pasty solid phases and emulsified fine oil droplets, making the oil-water separation process more difficult.

[0003] In practical engineering applications, traditional static hydrocyclone separation technology mainly relies on the conversion of static pressure energy at the fluid inlet into rotational kinetic energy, which has significant shortcomings when treating high-viscosity oily wastewater. On the one hand, traditional hydrocyclone inlets often adopt straight or abrupt structures, which easily generate large local shear stresses when the fluid enters the straight-cylinder dynamic hydrocyclone separation chamber, causing oil droplets to break up and inducing secondary emulsification, thereby reducing oil-water separation efficiency. On the other hand, traditional hydrocyclone separation processes lack effective control methods. When the feed flow rate changes, the tangential velocity distribution inside the cyclone field changes accordingly, and the central oil core structure is prone to drifting or breaking, leading to a decrease in separation stability.

[0004] Therefore, it is necessary to propose an oil-water separation control method that can actively regulate the local shear stress of the swirling field, suppress secondary emulsification of oil droplets, and dynamically match operating parameters according to operating conditions, so as to achieve stable and efficient separation of high-viscosity oil-containing systems. Summary of the Invention

[0005] To address the problems of excessively high local shear stress, poor swirling field stability, and rigid matching of operating parameters in traditional cyclone separation technology for high-viscosity, easily emulsified systems, this invention provides a dynamic cyclone oil-water separation control method based on curved flow guidance and parameter matching. By setting a curved rotating grid in a straight-cylinder dynamic cyclone separation chamber, the fluid achieves a smooth transition from axial flow to rotating flow as it enters the chamber, thereby forming a continuously and gradually changing tangential velocity distribution and reducing local shear stress in the inlet region. Simultaneously, by dynamically matching the relationship between conditioning temperature, rotation speed, feed flow rate, and the ratio of overflow to underflow, a stable enhanced centrifugal flow field is constructed to achieve stable operation of the oil-water separation process.

[0006] The technical solution of this invention is:

[0007] A dynamic cyclone oil-water separation control method based on curve guidance and parameter matching is used in a multi-stage collaborative separation system for catering waste. The multi-stage collaborative separation system for catering waste includes a feeding and crushing pretreatment module 100, a solid-liquid separation module 200, a thermal conditioning module 300, and a dynamic cyclone separation core module 400 connected in sequence. The multi-stage collaborative separation system for catering waste also includes a device support 600 for providing spatial support, a food residue collection box 601 communicating with the solid-liquid separation module 200, an oil collection box 602 communicating with the dynamic cyclone separation core module 400, and a wastewater collection box 603.

[0008] The control method includes:

[0009] S1: The feeding and crushing pretreatment module 100 crushes the fed food waste; the solid-liquid mixture after crushing is separated by the solid-liquid separation module 200 to obtain an oil-containing liquid phase; at the same time, the separated solid residue is discharged from the solid phase outlet 207 in the solid-liquid separation module 200 and falls into the food waste recycling bin 601.

[0010] S2: The oil-containing liquid phase after solid-liquid separation is subjected to thermal conditioning by thermal conditioning module 300;

[0011] S3: The heat-conditioned fluid is tangentially introduced into the cylindrical dynamic cyclone separation chamber 404 of the dynamic cyclone separation core module 400.

[0012] S4: The external drive motor 409 in the dynamic cyclone separation core module 400 drives the cylindrical dynamic cyclone separation chamber 404 and the curved rotating grid 403 fixed inside the dynamic cyclone separation core module 400 to rotate synchronously. The curved rotating grid 403 has circumferentially distributed guide vanes 407. The three-dimensional spatial profile of the guide vanes 407 is constructed based on a quadratic Bezier curve, so that the introduced fluid transitions smoothly under the guidance of the curved rotating grid 403. Finally, the aqueous phase is discharged from the underflow outlet 406 in the dynamic cyclone separation core module 400 and enters the wastewater collection tank 603, and the oil is discharged from the overflow outlet 405 in the dynamic cyclone separation core module 400 and enters the oil collection tank 602.

[0013] Furthermore, the control method also includes S5, wherein S5: by establishing a multi-factor response surface parameter optimization model, the matching relationship between the heat conditioning temperature of the heat conditioning module 300, the rotation speed of the curve rotating grid 403, the feed flow rate of the fluid, and the split ratio of the overflow and the underflow is dynamically adjusted.

[0014] Furthermore, the feeding and crushing pretreatment module 100 includes a feeding hopper 101, a first drive motor 102, and a dual-shaft cutter roller 103; the feeding hopper 101 is fixedly installed directly above the crushing chamber where the dual-shaft cutter roller 103 is located, and the lower discharge port of the feeding hopper 101 is completely connected to the upper opening of the crushing chamber; the output end of the first drive motor 102 is connected to the drive shaft of the dual-shaft cutter roller 103.

[0015] Further, the solid-liquid separation module 200 includes a housing, a second drive motor 201, an inlet end 202, a dynamic rod brush 203, a spiral blade 204, a perforated screen 205, a liquid phase outlet 206, a solid phase outlet 207, a spiral main shaft 208, and a brush fixing frame 209; the perforated screen 205 is cylindrical and horizontally fixed inside the housing, dividing the interior of the housing into a squeezing chamber inside the perforated screen and an external liquid collection chamber between the perforated screen and the housing; the inlet end 202 penetrates through the top of the housing and the front end of the perforated screen 205. The upper part is connected; the liquid phase outlet 206 is located at the bottom of the casing and communicates with the external liquid collection chamber; the solid phase outlet 207 is located at the bottom of the tail of the casing; the perforated screen 205 communicates with the solid phase outlet 207; the dynamic rod brush 203 is fixedly installed on the spiral main shaft 208 through the rod brush fixing frame 209; the spiral main shaft 208, the spiral blades 204 and the dynamic rod brush 203 are all coaxially arranged in the extrusion chamber inside the perforated screen 205; the output shaft of the second drive motor 201 is connected to the spiral main shaft 208 for transmission.

[0016] Furthermore, the dynamic cyclone separation core module 400 includes an oil-water inlet 401, a transmission pulley 402, a curved rotating grid 403, a cylindrical dynamic cyclone separation chamber 404, an overflow port 405, an underflow outlet 406, and an external drive motor 409. The cylindrical dynamic cyclone separation chamber 404 is horizontally arranged. The curved rotating grid 403 is coaxially fixed to the front end of the inner cavity of the cylindrical dynamic cyclone separation chamber 404. The oil-water inlet 401 is tangentially connected to the side wall of the front end of the chamber. The overflow port 405 is coaxially located at the center of the end face of the front end of the chamber. The underflow outlet 406 is connected to the lower part of the rear end of the chamber. The transmission pulley 402 is coaxially fixed to the outside of the front end of the cylindrical dynamic cyclone separation chamber 404, and the output end of the external drive motor 409 is connected to the transmission pulley 402 via a belt.

[0017] Furthermore, the angle between the inlet tangent direction of the guide vane 407 and the axial reference line is defined as the inlet guide angle α, and the value of the inlet guide angle α ranges from 10° to 50°.

[0018] The beneficial effects of this invention are:

[0019] (1) Inhibit secondary emulsification of oil droplets

[0020] This invention utilizes a curved rotating grid within a cylindrical dynamic cyclone separation chamber, rotating synchronously with the chamber. This allows for a smooth transition of fluid flow from axial to rotating as it enters the chamber, altering the abrupt geometric change at the inlet of traditional hydrocyclones. Guided by the curved guide vanes, the fluid achieves impact-free intake, significantly reducing local shear stress in the inlet region and effectively suppressing droplet breakage and secondary emulsification.

[0021] (2) Achieve adaptive matching of operating parameters

[0022] By establishing a multi-factor response surface parameter optimization model, the coupling relationship between operating parameters such as conditioning temperature, rotation speed, feed flow rate, and the overflow-underflow split ratio was revealed. During operation, the rotation speed and the overflow-underflow split ratio can be dynamically matched based on the model optimization results to maintain a stable vortex field, thereby improving oil-water separation efficiency and operational stability.

[0023] (3) Constructing a stable and enhanced swirling flow field

[0024] By combining the curved rotating grid with the rotational motion, a continuously and gradually changing tangential velocity distribution is constructed in the cylindrical dynamic swirling separation chamber, making the fluid distribution inside the swirling field more uniform and the central oil core structure more stable, thereby improving the oil-water separation accuracy.

[0025] (4) Improve the overall processing capacity of the system

[0026] By incorporating mechanical crushing, solid-liquid separation, and thermal conditioning processes before cyclone separation, the rheological properties of the fluid are improved and the viscosity of the oil phase is reduced, providing favorable physical property conditions for dynamic cyclone separation, thereby enhancing the reliability of continuous system operation and overall processing efficiency. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the multi-stage collaborative separation system for food waste of the present invention;

[0028] Figure 2 This is a schematic diagram of the internal structure of the feeding and crushing pretreatment module of the present invention;

[0029] Figure 3 This is a schematic diagram of the internal cross-sectional structure of the solid-liquid separation module of the present invention;

[0030] Figure 4 This is a schematic diagram of the structure of the spiral blade and dynamic rod brush combination component in the solid-liquid separation module of the present invention;

[0031] Figure 5 This is a schematic diagram of the thermal conditioning module of the present invention;

[0032] Figure 6 This is a schematic diagram of the internal cross-sectional structure of the dynamic cyclone separation module of the present invention;

[0033] Figure 7 This is a three-dimensional structural schematic diagram of the curved rotating grating of the present invention;

[0034] Figure 8 This is a schematic diagram illustrating the principle of defining the quadratic Bezier curve parameterization of the curved guide vane profile of the present invention.

[0035] The labels and symbols in the diagram, as well as the descriptions of the system modules, are as follows:

[0036] The labels in the diagram are as follows: 100 – Feeding and crushing pretreatment module; 101 – Feed hopper; 102 – First drive motor; 103 – Dual-shaft cutter roller; 200 – Solid-liquid separation module; 201 – Second drive motor; 202 – Inlet end; 203 – Dynamic rod brush; 204 – Spiral blade; 205 – Circular hole screen; 206 – Liquid phase outlet; 207 – Solid phase outlet; 208 – Spiral main shaft; 209 – Rod brush fixing frame; 300 – Thermal conditioning module; 301 – U-flange electric heating tube; 302 – Control panel; 303 – Oil-water inlet end; 304 – Oil-water outlet end; 40 0 – Dynamic cyclone separation module; 401 – Oil-water inlet; 402 – Drive pulley; 403 – Curved rotating grid; 404 – Straight cylindrical dynamic cyclone separation chamber; 405 – Overflow port; 406 – Underflow outlet; 407 – Curved guide vane; 408 – Tail guide cone; 409 – External drive motor; 501 – First transfer pump; 502 – Second transfer pump; 600 – Device support; 601 – Food residue collection tank; 602 – Oil collection tank; 603 – Wastewater collection tank; P0 – Starting point; P1 – Intermediate control point; P2 – Ending point; α – Inlet guide angle. Detailed Implementation

[0037] 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. 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. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be arbitrarily combined with each other.

[0038] Example 1: As Figures 1-8As shown, a dynamic cyclone oil-water separation control method based on curve guidance and parameter matching is used in a multi-stage collaborative separation system for catering waste. The multi-stage collaborative separation system for catering waste includes a feeding and crushing pretreatment module 100, a solid-liquid separation module 200, a thermal conditioning module 300, and a dynamic cyclone separation core module 400 connected in sequence. The multi-stage collaborative separation system for catering waste also includes a device support 600 for providing spatial support, a food residue collection box 601 communicating with the solid-liquid separation module 200, an oil collection box 602 communicating with the dynamic cyclone separation core module 400, and a wastewater collection box 603.

[0039] The control method includes:

[0040] S1: The feeding and crushing pretreatment module 100 crushes the fed food waste; the solid-liquid mixture after crushing is separated by the solid-liquid separation module 200 to obtain an oil-containing liquid phase; at the same time, the separated solid residue is discharged from the solid phase outlet 207 in the solid-liquid separation module 200 and falls into the food waste recycling bin 601.

[0041] S2: The oil-containing liquid phase after solid-liquid separation is thermally conditioned by the thermal conditioning module 300 to reduce the viscosity of the oil phase and increase the difference in physical properties between the oil and water phases;

[0042] S3: The heat-conditioned fluid is tangentially introduced into the cylindrical dynamic cyclone separation chamber 404 of the dynamic cyclone separation core module 400.

[0043] S4: The external drive motor 409 in the dynamic cyclone separation core module 400 drives the straight cylindrical dynamic cyclone separation chamber 404 and the curved rotating grid 403 fixed inside to rotate synchronously. The curved rotating grid 403 has circumferentially distributed guide vanes 407. The three-dimensional spatial profile of the guide vanes 407 is constructed based on the quadratic Bézier curve, so that the introduced fluid transitions smoothly under the guidance of the curved rotating grid 403. By forming a continuous and gradual tangential velocity distribution, the flow field transition in the inlet region is made more gentle. Finally, the aqueous phase is discharged from the underflow outlet 406 in the dynamic cyclone separation core module 400 and enters the wastewater collection tank 603, and the oil is discharged from the overflow outlet 405 in the dynamic cyclone separation core module 400 and enters the oil collection tank 602.

[0044] Furthermore, the regulation method also includes:

[0045] S5: Dynamically adjust the matching relationship between the conditioning temperature, the rotation speed of the curved rotating grid 403, the feed flow rate of the fluid, and the ratio of overflow to underflow in the thermal conditioning module 300 (the feed flow rate is the feed flow rate entering the straight-cylinder dynamic cyclone separation chamber 404, and the ratio of overflow to underflow is the matching relationship between the ratio of overflow port 405 and underflow outlet 406) to construct a stable enhanced centrifugal flow field and achieve oil-water separation. The optimal matching relationship between the conditioning temperature, rotation speed, feed flow rate, and the ratio of overflow to underflow is determined by analyzing and establishing a multi-factor response surface parameter optimization model. Specifically: the multi-factor response surface parameter optimization model uses conditioning temperature, rotation speed, feed flow rate, and the ratio of overflow to underflow as optimization independent variables, and oil-water separation efficiency as the target response value; by constructing a multi-factor experimental combination and analyzing the interaction relationship between each optimization independent variable and the target response value, the optimal matching relationship between each optimization independent variable is determined, and the actual operating conditions of the separation system are set according to the optimal matching relationship.

[0046] The angle between the inlet tangent direction of the guide vane 407 and the axial reference line is defined as the inlet guide angle α. The value of the inlet guide angle α is in the range of 10° to 50°, so as to achieve smooth and shock-free fluid intake.

[0047] As can be seen from the above technical solution, the multi-stage collaborative separation system for food waste adopts a compact, tiered layout. The feeding and crushing pretreatment module 100 and the solid-liquid separation module 200 utilize vertical spatial differences to achieve primary material transfer under gravity. Subsequent liquid phase fluid is then pumped sequentially into the thermal conditioning module 300 and the dynamic cyclone separation module 400 via a transfer pump. This reduces the overall footprint while effectively improving the system's conveying efficiency and operational stability. The control method of this invention is further explained below in conjunction with the multi-stage collaborative separation system for food waste:

[0048] I. Pretreatment and Solid-Liquid Separation Process (S1)

[0049] like Figure 1 , Figure 2As shown, the feeding and crushing pretreatment module 100 includes a feeding hopper 101, a first drive motor 102, and a dual-shaft cutter roller 103. The feeding hopper 101 is fixedly installed above the crushing chamber where the dual-shaft cutter roller 103 is located, and the lower discharge port of the feeding hopper 101 is completely connected to the upper opening of the crushing chamber to ensure that all input materials fall into the meshing area of ​​the dual-shaft cutter roller 103 without leakage. The output end of the first drive motor 102 is connected to the drive shaft of the dual-shaft cutter roller 103. After the catering waste enters through the feeding hopper 101, under the drive of the first drive motor 102, the dual-shaft cutter roller 103 crushes the solid components in the waste through shearing and extrusion, reducing the size of the blocky materials and achieving preliminary homogenization, thereby reducing the flow resistance in the subsequent separation process. The crushed solid-liquid mixture enters the solid-liquid separation module 200 located below the feeding and crushing pretreatment module 100 under the action of gravity. A guide chute with an open end is fixedly connected below the bottom outlet of the feeding and crushing pretreatment module 100, and the bottom opening of the guide chute faces downward and is directly aligned with and connected to the inlet end 202 of the solid-liquid separation module 200 located below. The crushed solid-liquid mixture is completely guided into the inlet end 202 through the guide chute under the action of gravity.

[0050] like Figure 3 and Figure 4 As shown, the solid-liquid separation module 200 includes a housing, a second drive motor 201, an inlet end 202, a dynamic rod brush 203, a spiral blade 204, a perforated screen 205, a liquid phase outlet 206, a solid phase outlet 207, a spiral main shaft 208, and a brush fixing frame 209; the perforated screen 205 is cylindrical and horizontally fixed inside the housing (the housing is...). Figure 3The casing (with a shaded section) divides the interior of the casing into a squeezing chamber inside the perforated screen and an external liquid collection chamber between the perforated screen and the casing. The inlet end 202 penetrates the top of the casing and connects to the upper front end of the perforated screen 205. The liquid phase outlet 206 is located at the bottom of the casing and communicates with the external liquid collection chamber. The solid phase outlet 207 is located at the bottom of the tail of the casing. The perforated screen 205 has a downward-through discharge notch directly above the solid phase outlet 207, allowing solid residue pushed to the tail end to fall directly into the solid phase outlet 207 for discharge. The separated solid residue is discharged from the solid phase outlet 207 and falls into the food residue recycling bin 601, achieving preliminary solid-liquid separation. The dynamic bar brush 203 is fixedly mounted on the spiral spindle 208 via a bar brush holder 209. The spiral spindle 208, spiral blades 204, and dynamic bar brush 203 are all coaxially arranged in the extrusion chamber inside the perforated screen 205. The output shaft of the second drive motor 201 is connected to the spiral spindle 208 for transmission. Driven by the second drive motor 201, the spiral spindle 208 drives the spiral blades 204 and dynamic bar brush 203 to rotate synchronously. After the solid-liquid mixture enters from the inlet end 202, it is conveyed axially forward under the push of the spiral blades 204. During the conveying process, the liquid phase passes through the perforated screen 205 under pressure and enters the liquid phase outlet 206. The dynamic bar brush 203 forms a slight interference fit with the inner wall of the perforated screen 205. During the spiral conveying process, it continuously removes the filter cake layer attached to the inner wall of the screen through tangential sweeping and mechanical peeling, thereby maintaining the permeability of the screen holes and preventing high-viscosity materials from clogging the screen.

[0051] II. Thermal conditioning process (S2)

[0052] The oily waste liquid after solid-liquid separation is transported to the oil-water inlet 303 of the thermal conditioning module 300 by the first transfer pump 501.

[0053] like Figure 5 As shown, the thermal conditioning module 300 also includes a housing, an electric heating element 301 inserted into the housing, and a control panel 302 for controlling the electric heating element 301. The electric heating element 301 is a multi-U-flange electric heating element structure, directly immersed in the mixture for direct heating of the fluid. The control panel 302 integrates a PID temperature closed-loop control system, which collects the fluid temperature signal in real time and adjusts the output power of the electric heating element 301 to keep the temperature of the mixture stable within the set range.

[0054] Thermoconditioning can reduce the viscosity of the oil phase and increase the density difference between the oil and water phases, thereby improving the rheological properties of the oil-water mixture and creating favorable conditions for subsequent cyclone separation.

[0055] In specific engineering applications, for the pretreatment and solid-liquid separation processes at the front end, the rated maximum feed flow rate Q entering the solid-liquid separation module 200 is... max The set flow rate is 1.0 t / h, and the actual feed flow rate of this module during operation is preferably controlled within the range of 0.3~1.0 t / h.

[0056] By adjusting the heating power of the heating element 301, the temperature of the mixture can be controlled within different conditioning ranges for operation and comparative testing, including: low temperature range: below 30 ℃; medium temperature range: 30 ~ 80 ℃; high temperature range: above 80 ℃. The above temperature ranges are used to analyze the influence of temperature changes on the rheological properties and separation effect of the oil-water two-phase system, and serve as the basic operating range for subsequent parameter optimization.

[0057] III. Dynamic Cyclone Separation Process (S3)

[0058] The conditioned oil-water mixture is transported from the oil-water outlet of the thermal conditioning module 300 to the dynamic cyclone separation core module 400 via the second transfer pump 502.

[0059] like Figure 6 As shown, the dynamic cyclone separation core module 400 includes an oil-water inlet 401, a transmission pulley 402, a curved rotating grid 403, a cylindrical dynamic cyclone separation chamber 404, an overflow port 405, an underflow outlet 406, and an external drive motor 409. The cylindrical dynamic cyclone separation chamber 404 is horizontally arranged. The curved rotating grid 403 is coaxially fixed to the front end of the inner cavity of the cylindrical dynamic cyclone separation chamber 404. The oil-water inlet 401 is tangentially connected to the side wall of the front end of the chamber. The overflow port 405 is coaxially located at the center of the end face of the front end of the chamber. The underflow outlet 406 is connected to the lower part of the rear end of the chamber. The transmission pulley 402 is coaxially fixed to the outside of the front end of the cylindrical dynamic cyclone separation chamber 404, and the output end of the external drive motor 409 is connected to the transmission pulley 402 via a belt. During operation, the oil-water mixture enters the cylindrical dynamic cyclone separator 404 tangentially through the oil-water inlet 401. Simultaneously, the external drive motor 409 drives the cylindrical dynamic cyclone separator 404 and its internally fixed curved rotating grid 403 to rotate synchronously via the transmission pulley 402, thereby applying angular velocity to the fluid and establishing a stable centrifugal flow field. Under the action of rotational centrifugal force, the denser water phase migrates towards the outer wall of the cylindrical dynamic cyclone separator 404, while the less dense oil phase gradually accumulates towards the central region.

[0060] In a preferred embodiment, the rotation speed of the cylindrical dynamic cyclone separation chamber 404 is controlled within the range of 800 to 2500 rpm to ensure that the intensity of the cyclone field meets the requirements for oil-water separation.

[0061] IV. Curved Rotating Gate Feature (S4)

[0062] like Figure 7 and Figure 8 As shown, the curved rotating grid 403 has several circumferentially evenly distributed curved guide vanes 407 and a tail guide cone 408 on its outer periphery. After the oil-water mixture enters the rotating drum, it gradually transitions from axial flow to rotational flow under the guidance of the curved guide vanes 407, thus forming a continuously and gradually changing tangential velocity distribution.

[0063] To reduce the local shear stress caused by geometric abrupt changes, the three-dimensional spatial profile of the curved guide vane 407 is constructed based on a quadratic Bézier curve, and its geometry is constrained by the starting point P0, the intermediate control point P1, and the ending point P2.

[0064] in:

[0065] The P0P1 vector defines the tangential direction of the fluid inlet. The angle between this direction and the axial reference line is defined as the inlet guide angle α, which is preferably in the range of 10° to 50° to ensure that the fluid is drawn in smoothly without impact.

[0066] The P1P2 vector is used to constrain the outlet section curve to gradually expand along the axial direction, giving the entire curve a continuous curvature distribution, thereby reducing local shear stress and suppressing oil droplet breakup and secondary emulsification. Those skilled in the art can adjust the control point positions according to the rheological characteristics of different processed objects.

[0067] A tail guide cone 408 is provided at the tail of the curved guide vane 407 to further stabilize the fluid flow state and reduce the formation of the tail backflow region.

[0068] Those skilled in the art can adjust the control point position of the Bézier curve appropriately according to the rheological characteristics, processing scale and operating conditions of different processing objects to obtain different tangential velocity gradient distributions.

[0069] Through the synergistic effect of the curved rotating grid and the rotational motion, a stable swirling flow field structure is formed inside the cylindrical dynamic swirling separation cavity 404.

[0070] V. Oil-water separation control process (S5)

[0071] Under the influence of a stable swirling flow field, the denser water phase migrates towards the outer wall of the cylindrical dynamic swirling separation chamber 404 and moves along the wall to the far end, eventually being discharged from the underflow outlet 406 through a conduit and entering the wastewater collection tank 603.

[0072] At the same time, the oil droplets with lower density gradually gather towards the axial region to form a stable oil core structure, and move along the axial direction towards the overflow port 405. Finally, the overflow port 405 enters the oil collection tank 602 through the conduit.

[0073] During the separation process, a multi-factor response surface parameter optimization model was established to analyze the interaction relationships among the following parameters: conditioning temperature, rotational speed, feed flow rate, and the ratio of overflow to underflow. These parameters served as input variables for the response surface model, and the optimal matching relationship was determined through experiments or operational data.

[0074] The specific embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A dynamic cyclone oil-water separation control method based on curve guidance and parameter matching, characterized in that, This system is used for a multi-stage collaborative separation system for food waste. The multi-stage collaborative separation system for food waste includes a feeding and crushing pretreatment module (100), a solid-liquid separation module (200), a thermal conditioning module (300), and a dynamic cyclone separation core module (400) connected in sequence. The multi-stage collaborative separation system for food waste also includes a support device (600), a food residue collection tank (601) connected to the solid-liquid separation module (200), an oil collection tank (602) connected to the dynamic cyclone separation core module (400), and a wastewater collection tank (603). The control method includes: S1: The feeding and crushing pretreatment module (100) crushes the fed food waste; the solid-liquid mixture after crushing is separated by the solid-liquid separation module (200) to obtain an oil-containing liquid phase; at the same time, the separated solid residue is discharged from the solid phase outlet (207) in the solid-liquid separation module (200) and falls into the food waste recycling bin (601); S2: The oil-containing liquid phase after solid-liquid separation is subjected to thermal conditioning according to the thermal conditioning module (300); S3: The thermally conditioned fluid is tangentially introduced into the cylindrical dynamic cyclone separation chamber (404) of the dynamic cyclone separation core module (400); S4: The external drive motor (409) in the dynamic cyclone separation core module (400) drives the straight cylindrical dynamic cyclone separation chamber (404) and the curved rotating grid (403) fixed inside the dynamic cyclone separation core module (400) to rotate synchronously. The curved rotating grid (403) has circumferentially distributed guide vanes (407). The three-dimensional spatial profile of the guide vanes (407) is constructed based on the quadratic Bezier curve, so that the introduced fluid transitions smoothly under the guidance of the curved rotating grid (403). Finally, the aqueous phase is discharged from the underflow outlet (406) in the dynamic cyclone separation core module (400) and enters the wastewater collection tank (603), and the oil is discharged from the overflow port (405) in the dynamic cyclone separation core module (400) and enters the oil collection tank (602).

2. The dynamic swirling oil-water separation control method based on curve guidance and parameter matching according to claim 1, characterized in that, The control method further includes S5, wherein S5: by establishing a multi-factor response surface parameter optimization model, the matching relationship between the heat conditioning temperature of the heat conditioning module (300), the rotation speed of the curve rotating grid (403), the feed flow rate of the fluid, and the ratio of overflow to underflow is dynamically adjusted.

3. The dynamic swirling oil-water separation control method based on curve guidance and parameter matching according to claim 1, characterized in that, The feeding and crushing pretreatment module (100) includes a feeding hopper (101), a first drive motor (102), and a double-shaft cutter roller (103). The feeding hopper (101) is fixedly installed above the crushing chamber where the double-shaft cutter roller (103) is located, and the lower discharge port of the feeding hopper (101) is completely connected to the upper opening of the crushing chamber. The output end of the first drive motor (102) is connected to the drive shaft of the double-shaft cutter roller (103).

4. The dynamic swirling oil-water separation control method based on curve guidance and parameter matching according to claim 1, characterized in that, The solid-liquid separation module (200) includes a housing, a second drive motor (201), an inlet end (202), a dynamic rod brush (203), a spiral blade (204), a perforated screen (205), a liquid phase outlet (206), a solid phase outlet (207), a spiral main shaft (208), and a brush holder (209). The perforated screen (205) is cylindrical and horizontally fixed inside the housing, dividing the interior of the housing into a squeezing chamber inside the perforated screen and an external liquid collection chamber between the perforated screen and the housing. The inlet end (202) penetrates the top of the housing and extends above the front end of the perforated screen (205). The liquid phase outlet (206) is located at the bottom of the housing and communicates with the external liquid collection chamber; the solid phase outlet (207) is located at the bottom of the tail of the housing; the perforated screen (205) communicates with the solid phase outlet (207); the dynamic rod brush (203) is fixedly installed on the spiral spindle (208) through the rod brush fixing bracket (209); the spiral spindle (208), the spiral blades (204) and the dynamic rod brush (203) are all coaxially arranged in the extrusion chamber inside the perforated screen (205); the output shaft of the second drive motor (201) is connected to the spiral spindle (208) for transmission.

5. The dynamic swirling oil-water separation control method based on curve guidance and parameter matching according to claim 1, characterized in that, The dynamic cyclone separator core module (400) includes an oil-water inlet (401), a transmission pulley (402), a curved rotating grid (403), a cylindrical dynamic cyclone separator chamber (404), an overflow port (405), an underflow outlet (406), and an external drive motor (409); the cylindrical dynamic cyclone separator chamber (404) is horizontally arranged; the curved rotating grid (403) is coaxially fixed to the cylindrical dynamic cyclone separator chamber (404). The inner cavity front end; the oil-water inlet (401) is tangentially connected to the side wall of the front end of the cavity; the overflow port (405) is coaxially connected to the center of the end face of the front end of the cavity; the underflow outlet (406) is connected to the lower part of the rear end of the cavity; the transmission pulley (402) is coaxially fixed to the outside of the front end of the straight cylindrical dynamic vortex separation cavity (404), and the output end of the external drive motor (409) is connected to the transmission pulley (402) via a belt.

6. The dynamic cyclone oil-water separation control method based on curve guidance and parameter matching according to claim 1, characterized in that, The angle between the inlet tangent direction of the guide vane (407) and the axial reference line is defined as the inlet guide angle α, and the value of the inlet guide angle α is in the range of 10°~50°.

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