Pollutant directional deposition and scour system and method based on variable interval waste staging

Abstract

The present application relates to the technical field of fluid purification control system, and particularly relates to a pollutant directional deposition and flushing system and method based on variable interval waste discharge. The pollutant directional deposition and flushing system based on variable interval waste discharge comprises an intelligent control module, a pipeline switching module, a waste discharge detection module, a variable-diameter deposition module and an ultrasonic auxiliary waste discharge module which are signal connected with the intelligent control module. The variable-diameter deposition module comprises a flexible pipeline and a variable-diameter adjusting assembly. The flexible pipeline comprises an input transition section, an output transition section and an intermediate variable-volume section. The two ends of the flexible pipeline are connected with the main pipeline. The inner surface of the flexible pipeline is provided with a micro-cavity array. The variable-diameter adjusting assembly is used for adjusting the diameter of the variable-volume section. The present application has the advantages of being able to realize complete stripping of dead zone pollutants, adapt to different pollution loads, reduce operation cost, avoid secondary pollution and excessive waste discharge, have wide scene adaptability, be stable and reliable in operation and be able to significantly improve efficiency.

Description

Technical Field

[0001] This invention relates to the field of fluid purification and control system technology, specifically to a system and method for directional deposition and flushing of pollutants based on variable interval waste discharge. Background Technology

[0002] In high-precision water supply systems, suspended particles in the fluid (especially tiny particles with a diameter of 10-500 nm) can severely affect the stability of subsequent production processes and even lead to product spoilage. Traditional fluid purification devices generally use a fixed-diameter pipe structure, which has significant technical drawbacks:

[0003] First, it is difficult to achieve both deposition and waste removal effects. To achieve particle deposition, the fluid velocity needs to be reduced, but low velocity will prevent particles in the dead zone of the pipe from being effectively discharged. If the velocity is increased to enhance waste removal, it will disrupt the stable flow field required for deposition and reduce deposition efficiency, thus creating an inherent contradiction between the two.

[0004] Second, the waste discharge cycle design is unreasonable. Most existing devices use a fixed waste discharge cycle. During the use of the pipeline, the amount of particles deposited in the pipeline is small in the early stage, but waste discharge is frequent, resulting in fluid waste and low operating efficiency. When the amount of deposits increases in the later stage, the fixed cycle cannot meet the demand for sufficient deposition, which can easily cause particles to accumulate and overflow.

[0005] Third, the method of judging cleanliness is vague. The cleanliness of the main pipeline is usually tested by manual sampling, which can easily lead to the conclusion that the main pipeline is clean if waste is discharged in a certain area. Incomplete waste discharge can easily cause secondary pollution, while excessive waste discharge increases operating costs. The judgment results lack objectivity and accuracy. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention provides a system and method for directional deposition and flushing of pollutants based on variable interval waste discharge, achieving efficient and low-cost deposition of particles of different sizes and complete discharge of pollutants from dead zones.

[0007] This invention employs a directional pollutant deposition and flushing system based on variable-interval waste discharge, comprising an intelligent control module, and a pipeline switching module, a waste discharge detection module, a variable-diameter deposition module, and an ultrasonic-assisted waste discharge module, all signal-connected to the intelligent control module. The variable-diameter deposition module includes a flexible pipe and a diameter adjustment component. The flexible pipe includes an input transition section, an output transition section, and an intermediate variable-capacity section, with both ends connected to a main pipeline. The inner surface of the flexible pipe is provided with a micro-cavity array. The diameter adjustment component is used to adjust the diameter of the variable-capacity section. The output end of the flexible pipe is connected to the main pipeline and the waste discharge detection module via the pipeline switching module, which switches the connection state between the output end of the flexible pipe and either the main pipeline or the waste discharge detection module. The ultrasonic-assisted waste discharge module applies ultrasonic vibration to the flexible pipe. The waste discharge detection module detects pressure changes in the ultrasonic-assisted waste discharge module during the waste discharge process.

[0008] The system achieves separation and control of deposition and waste discharge through flexible pipes with variable diameter. It combines micro-cavity arrays to promote directional particle deposition and ultrasonic vibration to enhance pollutant stripping. The pipe diameter change, pipeline switching and waste discharge detection are intelligently controlled by the intelligent control module to achieve automatic operation and cleanliness determination. This solves the problems of traditional devices that make it difficult to balance deposition and waste discharge, have fixed waste discharge cycles and ambiguous cleanliness determination.

[0009] Preferably, the intelligent control module is configured as follows:

[0010] a) Dynamically update the waste discharge interval t based on the preset initial waste discharge interval t0 and the increment coefficient k. n+1 =t n ×k, where t n This represents the time interval between the nth and (n+1)th waste discharges; it enables the waste discharge cycle to be adaptively adjusted according to the process of pollutant deposition in the pipeline. The short interval in the early stage can prevent the rapid accumulation of particles, while the long interval in the later stage can ensure the full deposition of trace pollutants and reduce ineffective waste discharge, thereby significantly reducing operating costs and fluid waste while ensuring the purification effect.

[0011] b) Based on the pressure data fed back by the waste discharge detection module, the system determines whether a single waste discharge is complete by calculating whether the rate of change of the first derivative of the pressure is lower than a first threshold; this provides a precise endpoint criterion for microcavity waste discharge, replacing traditional experience or timed control, and effectively avoiding secondary pollution caused by incomplete single waste discharge or resource waste caused by excessive waste discharge;

[0012] c) Based on the pressure data fed back by the waste discharge detection module after multiple consecutive waste discharges, the overall cleanliness of the main pipeline is determined by calculating whether the rate of change of the first derivative of the pressure is continuously lower than the second threshold. On the basis of a complete determination after a single waste discharge, the overall cleanliness of the main pipeline is further evaluated by the stability of multiple waste discharge data. This ensures that the system only switches to the low-energy normal circulation mode after reaching a truly clean state, thereby improving the reliability and intelligence level of the system operation.

[0013] Preferably, in the microcavity array, the microcavities are uniformly arranged circumferentially and staggered axially. The depth h1 of the microcavities satisfies 80μm≤h1≤300μm, and the opening width w1 satisfies 150μm≤w1≤600μm. The central angle between adjacent circumferential microcavities is 6°~12°, and the spacing between adjacent axial microcavities is 150μm~400μm. The microcavity array contains 80~200 rings of microcavities. The microcavity array can form a stable, uniform, and fully covered secondary flow field on the inner wall of the pipe. The reasonable aspect ratio and spacing are conducive to capturing particles of different sizes in the range of 10~500nm, and to achieving the layered and orderly deposition of light small particles and heavy large particles in the cavity, thereby significantly improving the efficiency and capacity of directional particle deposition.

[0014] Preferably, the flexible pipe is made of an ultra-clean flexible material, including a fluororubber and PTFE composite material. The flexible pipe has a thickness of 2-5 mm, and its diameter, in its unexpanded or contracted state, is adapted to the main pipeline. The upper limit of the diameter expansion achievable by the variable-capacity section in the expanded state is not less than 200% of the main pipeline diameter, and the lower limit of the diameter reduction achievable in the contracted state is not greater than 80% of the main pipeline diameter. The ultra-clean material prevents the pipe itself from becoming a source of contamination, ensuring fluid purity. The flexible pipe can significantly reduce the flow velocity in the expanded state, causing particulate matter to concentrate and deposit, while the contracted state can significantly increase the flow velocity, improving waste discharge efficiency, thereby resolving the inherent contradiction between deposition and waste discharge in terms of flow velocity requirements.

[0015] Preferably, the pipe diameter adjustment assembly includes a stepper motor and multiple movable frames. The movable frames are driven by the stepper motor through a transmission rod to achieve height adjustment. The variable-capacity section of the flexible pipe is fixed with a rigid shell. The movable frames are connected to the rigid shell through a cover plate. By changing the height of the movable frames, the rigid shell is driven to move radially, thereby causing the variable-capacity section of the flexible pipe to expand or shrink.

[0016] Preferably, the ultrasonic-assisted waste removal module includes at least one ultrasonic transducer, a connecting rod, and a high-frequency power supply. The ultrasonic transducer is connected to the rigid outer shell of the flexible pipe via the connecting rod, and the high-frequency power supply is electrically connected to the ultrasonic transducer. Non-contact installation via the connecting rod effectively transmits the high-frequency mechanical vibration generated by the ultrasonic transducer to the pipe wall, while simultaneously isolating the influence of the fluid temperature inside the pipe on the transducer's performance. Ultrasonic cavitation and vibration effectively break down the adhesion between contaminants and the inner wall of the microcavities, especially for stubborn deposits in dead zones and at the bottom of the cavities. Combined with high-velocity fluid, this achieves complete removal, significantly improving the waste removal effect.

[0017] Preferably, the waste discharge detection module includes a waste discharge branch, a filter connected in series on the waste discharge branch, and pressure detection components installed at both ends of the filter. The pressure detection components are signal-connected to the intelligent control module. The pipeline switching module is a 2-position 3-way valve.

[0018] Preferably, the filter has a filtration accuracy of not less than 0.05 μm and not more than 0.2 μm, the pressure detection component has a measurement upper limit of not less than 0.1 MPa, a measurement accuracy of not less than 0.0002 MPa, and a sampling frequency of not less than 40 Hz. Under these parameters, the pressure detection component can sensitively capture minute pressure fluctuations caused by changes in pollutant concentration during waste discharge, providing a high-quality data foundation for accurate judgment algorithms based on pressure change rate, and ensuring the real-time performance and accuracy of the judgment results.

[0019] This invention also proposes a method for directional deposition and flushing of pollutants based on the above system, comprising the following steps:

[0020] S1. The intelligent control module controls the variable diameter deposition module to switch to the expansion state and controls the pipeline switching module to connect the flexible pipeline to the main pipeline. Fluid flows through the flexible pipeline, and particles of different diameters are deposited in layers in the micro-cavity array.

[0021] S2. When the current waste discharge interval is reached, the intelligent control module controls the pipeline switching module to connect the flexible pipeline with the waste discharge detection module, and controls the variable diameter deposition module to switch to the pipe shrinking state;

[0022] S3. Activate the ultrasonic-assisted waste removal module to apply ultrasonic vibration to the flexible pipe to assist in the removal of sediment;

[0023] S4. The pressure change at both ends of the filter during the waste discharge process is monitored by the waste discharge detection module. When the pressure change rate is lower than the first preset threshold multiple times in a row, it is determined that a single waste discharge is completed, and the current stable pressure value is recorded.

[0024] S5. According to formula t n+1 =tn ×k updates the waste discharge interval, controls the pipeline switching module to switch to the expansion state, and the variable diameter deposition module connects the flexible pipeline to the main pipeline;

[0025] S6. Repeat steps S2-S5. When the fluctuation range of the recorded stable pressure value is lower than the second preset threshold after multiple waste discharges, it is determined that the main pipeline is clean, and the variable diameter deposition module is controlled to switch to the normal flow state with the same diameter as the main pipeline.

[0026] Preferably, after determining the overall cleanliness of the main pipeline in step S6, the self-inspection and waste discharge process of steps S2-S4 is periodically executed according to a preset self-inspection cycle. If the pressure change rate at both ends of the filter is detected to be higher than the first preset threshold multiple times during the self-inspection and waste discharge, then steps S1-S6 are restarted. Periodic checks can promptly detect recurring particle deposition problems and automatically trigger the deposition-waste discharge process, ensuring that the system can maintain operation at the set high cleanliness standard for a long time without manual intervention, thus improving the system's adaptability and long-term reliability.

[0027] The beneficial effects of this invention include:

[0028] 1. Break the contradiction between deposition and waste discharge. Through dynamic adjustment of the pipe diameter over a wide range of β~α, the flow rate is reduced in the expansion state to create a stable flow field for particle deposition, and the flow rate is increased in the contraction state. Combined with ultrasonic vibration at f1 frequency, the pollutants in the dead zone are completely removed, thus resolving the functional conflict of traditional devices.

[0029] 2. Adapt to different pollution loads, with waste discharge intervals dynamically increasing by a factor of k. Shorter intervals in the initial stage prevent particle accumulation, while longer intervals in the later stage ensure sufficient deposition of trace pollutants, reducing ineffective waste discharge and lowering operating costs.

[0030] 3. The cleanliness assessment is precise and layered, distinguishing between "complete waste discharge from the concave cavity" and "overall cleanliness of the main pipeline". The pressure change rate is used to determine local compliance for a single waste discharge, and the pressure stability fluctuation is used to determine overall cleanliness for multiple waste discharges, replacing the traditional fuzzy assessment and avoiding secondary pollution and excessive waste discharge.

[0031] 4. Wide adaptability to various scenarios, supporting main pipelines in the range of 10~50mm. Microcavity parameters, ultrasonic parameters and filtration accuracy can be flexibly adapted to meet the needs of various high-precision water supply scenarios such as ultrapure water preparation, electronic-grade high-purity chemical preparation, precision instrument cooling, and photovoltaic cell production.

[0032] 5. Stable and reliable operation: The ultrasonic module adopts a non-contact installation where the transducer does not directly contact the tube wall. The heat conduction is isolated by the heat-insulating connecting rod, avoiding the impact of temperature on the transducer performance, extending the service life of the components, and ensuring the long-term stable operation of the system.

[0033] 6. Significantly improves efficiency: Automated stratified cleaning judgment and dynamic waste discharge cycle design reduce manual intervention and ineffective operation time, greatly improving the overall efficiency of fluid purification. Attached Figure Description

[0034] Figure 1 This is a simplified diagram of the system of the present invention.

[0035] Figure 2 This is a schematic diagram of the variable diameter deposition module and the ultrasonic-assisted waste removal module of the present invention.

[0036] Figure 3 This is a schematic diagram of the pipeline connection in the expanded pipe deposition state of the present invention.

[0037] Figure 4 This is a schematic diagram of the pipeline connection in the waste discharge state of the present invention.

[0038] Figure 5 This is a schematic diagram of the pipeline connection under normal flow conditions according to the present invention.

[0039] Figure 6 This is a schematic diagram of the particle deposition principle of the microcavity of the present invention. Detailed Implementation

[0040] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0041] Example 1

[0042] This embodiment discloses a pollutant-directed deposition and flushing system based on variable interval waste discharge in the application of ultrapure water preparation and supply scenarios.

[0043] like Figure 1 As shown, the intelligent flushing system consists of an intelligent control module, a variable diameter deposition module, an ultrasonic-assisted waste removal module, a pipeline switching module, and a waste removal detection module. The intelligent control module serves as the core, coordinating all modules to form a closed-loop operation system of "deposition-waste removal-layer detection-reset". The arrows in the diagram indicate the overall path of signal transmission (between the intelligent control module and other modules) and fluid flow.

[0044] The intelligent control module uses a PLC controller with a response delay T1 ≤ 10ms. It connects with other modules and is responsible for the timing control and signal interaction of each module. It supports dynamic changes in the waste discharge interval and is also responsible for the layered cleanliness determination logic. The initial value of the waste discharge interval is set to t0 = 30min, and the waste discharge interval increases dynamically by a factor of 1.3.

[0045] like Figure 2As shown, the variable diameter deposition module includes a rigid shell 4, a flexible pipe 5, a cover plate 6, a movable frame 7, a transmission rod 8, and a stepper motor 9. The core component is the flexible pipe, which is made of ultra-clean flexible material; in this embodiment, PTFE composite material is used. The flexible pipe 5 consists of an input transition section, an output transition section, and an intermediate variable capacity section. The rigid shell 4 surrounds the flexible pipe 5 and is glued to the outer surface of the variable capacity section. Hollow threaded connectors 10 are sealed and fixed at both ends of the flexible pipe 5. The threaded connector 10 at the inlet end of the flexible pipe 5 connects to the front outlet of the main pipeline, and the threaded connector 10 at the outlet end of the flexible pipe 5 connects to the rear inlet of the main pipeline or the inlet of the waste discharge branch through a pipeline switching module. The pipe diameter adjustment assembly consists of a cover plate 6, a movable frame 7, a transmission rod 8, and a stepper motor 9. Multiple movable frames 7 are provided, each including two rigid rods hinged together to form an X-shape. The hinge shafts of the movable frame 7 are driven and connected to the stepper motor 9 via the transmission rod 8. The height of the movable frame 7 varies depending on the angle between the two rigid rods, and the height direction of the movable frame 7 is parallel to the radial direction of the flexible pipe 5. The cover plate 6 is connected to both ends of the rigid rods and is also connected to the rigid shell 4 via an ultrasonic-assisted waste removal module. When the stepper motor 9 drives the movable frame 7 to change its height, the height change of the movable frame 7 drives the radial expansion or contraction of the variable-capacity section along the flexible pipe 5 via the cover plate 6, the ultrasonic-assisted waste removal module, and the rigid shell 4, thereby achieving dynamic pipe diameter adjustment and forming an expanded-capacity state, a contracted-capacity state, and a normal flow state. The expanded-capacity state refers to the variable-capacity section being expanded to its maximum, and the contracted-capacity state refers to the variable-capacity section being contracted to its minimum. The inner wall of the flexible pipe 5 is arranged with an array of micro-cavities. These micro-cavities can be circular or square grooves; in this embodiment, cylindrical micro-cavities are used. The micro-cavities are evenly arranged circumferentially and staggered axially. Figure 6 As shown, when fluid flows through the micro-cavities in the inner wall of the flexible pipe, a stable secondary flow (higher-order eddy current) is formed. Impurity particles are deposited in the cavity under the combined action of the eddy current and gravity, achieving directional deposition of particles of different sizes. In this embodiment, the flexible pipe 5 is 3mm thick and is adapted to a main pipeline with a diameter of 16mm; the stepper motor 9 has a control accuracy of 0.01mm / step, and the cover plate 6 moves at a speed of 0.8mm / s. The variable-capacity section of the flexible pipe 5 can dynamically adjust the pipe diameter from 30% to 220% of the main pipeline diameter. In actual control, its diameter is generally not adjusted to the limit. In this embodiment, the diameter of the variable-capacity section is 24mm in the expanded state and 12.8mm in the contracted state. In the micro-cavity array, the depth of the micro-cavity is h1=100μm, the opening width is w1=200μm, the central angle between adjacent micro-cavities in the circumferential direction is 10°, the spacing between adjacent micro-cavities in the axial direction is 200μm, and the total number of micro-cavities is 100.

[0046] The ultrasonic-assisted waste removal module includes ultrasonic transducers 1, connecting rods 2, and a high-frequency power supply 3. Four ultrasonic transducers 1 are enclosed within the rigid housing 4 of each variable-diameter deposition module. Each ultrasonic transducer 1 is installed non-contactly with the flexible pipe 5 via the heat-insulating connecting rod 2 and the rigid housing 4. The ultrasonic transducers 1 do not directly contact the pipe wall of the flexible pipe 5, preventing the pipe's operating temperature from being conducted to the ultrasonic transducers and causing performance failure. The high-frequency power supply 3 is electrically connected to the ultrasonic transducers 1, driving them to generate high-frequency vibrations, enhancing the removal of contaminants from the pipe's inner wall. The high-frequency power supply outputs a voltage U1 = 24V and an output current I1 = 1A; the ultrasonic transducer vibration frequency f1 = 30kHz and amplitude A1 = 8μm.

[0047] like Figures 3 to 6 As shown, the pipeline switching module includes a 2-position 3-way valve with a switching response time T2≤20ms. The 2-position 3-way valve includes a P port, an A port, and a B port. The P port is connected to the output of the flexible pipeline 5, the A port is connected to the main pipeline, and the B port is connected to the waste discharge branch, realizing fast and stable switching.

[0048] The waste discharge detection module includes a filter and a differential pressure sensor. The filter is connected in series in the waste discharge branch, with a filtration accuracy of 0.1μm. The filter element is made of ultra-clean, flexible polytetrafluoroethylene (PTFE) material, and has a maximum withstand differential pressure of 0.5MPa. The differential pressure sensor is located at the inlet and outlet of the filter, collecting pressure data in real time and transmitting it to the intelligent control module. The measurement range is P1~P2=0~0.1MPa, the accuracy is ΔP1=0.0001MPa, and the data acquisition frequency is 50Hz.

[0049] Based on the above-mentioned pollutant directional deposition and flushing system based on variable interval waste discharge, the intelligent flushing method includes steps S1-S6:

[0050] S1. Initialize Deposition. After the system powers on and performs a self-test, the intelligent control module drives the variable-diameter deposition module to switch to the expansion state. The diameter of the variable-diameter section of the flexible pipe 5 is increased to 24mm. Figure 3 As shown, the pipeline switching module connects the flexible pipeline 5 to the main pipeline; the system starts with a timer; the ultrapure water feed liquid flows smoothly into the input transition section. Due to the expansion of the pipeline diameter, the flow velocity in the variable volume section drops to 50% of the normal flow velocity. The micro-cavity array forms a stable secondary flow. Light particles of 60~100nm in the ultrapure water feed liquid are deposited in the upper half of the micro-cavity, and heavy particles of 100~200nm are deposited in the lower half of the micro-cavity.

[0051] S2. Waste Discharge Trigger. When the timer reaches the initial value of the waste discharge interval t0 = 30 minutes, the intelligent control module sends a command, such as... Figure 4As shown, the pipeline switching module switches to connect the flexible pipeline 5 with the waste discharge branch, the pipe diameter variable deposition module switches to the shrinking state, the diameter of the variable volume section of the flexible pipeline 5 is 12.8mm, and the fluid velocity in the variable volume section is increased to 3 times the normal velocity.

[0052] S3. Ultrasonic-assisted waste removal. Start the high-frequency power supply 3, and the ultrasonic transducer 1 operates according to the preset parameters. The high-frequency vibration, combined with the high-velocity turbulence, breaks the adhesion between the particles and the inner wall of the micro-cavity, peels off the deposited particles at the bottom of the micro-cavity and the dead zone of the pipe, and the particles enter the waste removal branch with the fluid and are intercepted by the filter.

[0053] S4. Complete Discharge Determination of Microcavity. The differential pressure sensor collects pressure data at a frequency of 50Hz and transmits it to the intelligent control module. The intelligent control module calculates the first derivative of the pressure, i.e., the pressure change rate, every 0.5s. When the pressure change rate dP / dt is detected to be ≤0.001MPa / s for 5 consecutive times, the discharge is determined to be complete, the high-frequency power supply 3 is turned off, and the stable pressure value at both ends of the filter is recorded when the discharge is complete.

[0054] S5. Reset and update. According to formula t... n+1 =t n ×k updates the waste removal interval, where t n This represents the time interval between the nth and (n+1)th waste discharges. Specifically, t0 is the initial value of the waste discharge interval, representing the time interval from the start of the main pipeline work to the first waste discharge, and k represents the increment coefficient. In this embodiment, the initial waste discharge interval is set to t0 = 30 minutes, and the increment coefficient k = 1.3. For example... Figure 5 As shown, the pipeline switching module reconnects the flexible pipeline 5 to the main pipeline, and the variable diameter deposition module resets to its expanded state, entering the next deposition cycle. Subsequent waste discharge intervals increase according to this pattern, extending the deposition time to ensure sufficient deposition of trace contaminants. Initially, the amount of contaminants deposited in the pipeline is small, and the waste discharge interval is short to avoid particle accumulation. As the deposition process progresses, the amount of depositable contaminants in the pipeline gradually decreases, and the waste discharge interval increases accordingly, extending the deposition time to ensure sufficient deposition of trace contaminants in the fluid and maximizing deposition efficiency.

[0055] S6. Overall Cleanliness Judgment and Self-Inspection of Main Pipeline. Repeat the deposition-discharge process of S2~S5 above, and record the pressure stability value after each discharge. When the pressure stability value fluctuation of three consecutive discharges is ≤0.001MPa, the main pipeline is judged to be clean. The intelligent control module drives the variable diameter deposition module to switch to normal flow state with a diameter of 16mm, the same as the main pipeline. During the normal flow state, a self-inspection discharge is initiated every T4=8h, where T4 represents the self-inspection discharge interval. The self-inspection discharge process is the same as the normal discharge (steps S2-S4). If the self-inspection detects five consecutive pressure change rates dP / dt>0.001MPa / s, the system automatically returns to S1 and re-executes the S2~S5 deposition-discharge cycle.

[0056] The above steps include a dual-layer cleanliness determination mechanism. The first layer is the complete determination of waste discharge from the microcavities in step S4, and the second layer is the overall cleanliness determination of the main pipeline in step S6. This efficiently and accurately determines the cleanliness of the microcavities and the main pipeline, thereby enabling the variable diameter deposition module to switch to the appropriate working state.

[0057] Example 2

[0058] This embodiment discloses a pollutant-directed deposition and flushing system based on variable interval waste discharge for the application of electronic-grade high-purity chemical solution preparation and water supply.

[0059] The structural design and parameter configuration of the intelligent flushing system in this embodiment are as follows, and other structural settings are the same as in Embodiment 1.

[0060] In the intelligent control module, the response delay T1 is set to 15ms, the initial value of the waste discharge interval t0 is 60min, and the increment coefficient k is 1.7. During the complete waste discharge judgment process of the concave cavity, the pressure change rate at both ends of the filter is calculated every interval T3 = 0.4s. When the pressure change rate at both ends of the filter does not exceed the preset threshold ΔP3 = 0.0005MPa / s for m = 6 consecutive times, the waste discharge is judged to meet the standard. During the main pipeline cleaning judgment process, when the pressure stability fluctuation range between two adjacent waste discharges does not exceed the preset threshold ΔP2 = 0.0008MPa for n = 4 consecutive waste discharges, the main pipeline is judged to be clean overall. The self-inspection waste discharge interval T4 = 12h.

[0061] In the variable diameter deposition module, the flexible pipe is made of thickened PTFE composite material to enhance its resistance to chemical corrosion. The flexible pipe is 5mm thick and is suitable for a 20mm diameter main pipeline. The lower limit of pipe shrinkage β=30% and the upper limit of pipe expansion α=220%. In actual control, the diameter of the flexible pipe in the expanded state is 32mm and the diameter of the flexible pipe in the shrinked state is 14mm. In the microcavity array, the depth of the microcavity h1=200μm, the opening width of the microcavity w1=400μm, the central angle of adjacent microcavities in the circumferential direction is 8°, the spacing between adjacent microcavities in the axial direction is 300μm, and the total number of microcavities is 150 rings. Compared with Example 1, the number of microcavities has been increased to enhance the capture of chemical residue particles.

[0062] In the ultrasonic-assisted waste removal module, eight ultrasonic transducers are fixed to the rigid outer shell via heat-insulating connecting rods. The transducers do not directly contact the flexible pipe wall to avoid chemical corrosion of the transducers. The ultrasonic transducers have a vibration frequency of f1=45kHz and an amplitude of A1=12μm. The high frequency and high amplitude enhance the peeling of sticky particles. The high-frequency power supply has an output voltage of U1=36V and an output current of I1=2A.

[0063] In the waste discharge detection module, the filter has a filtration accuracy of 0.05μm and the filter element material is chemical-resistant ceramic; the differential pressure sensor has an accuracy of ΔP1=0.0001MPa and a data acquisition frequency of 60Hz, which improves the sampling frequency to adapt to rapid pressure changes.

[0064] The intelligent flushing method of this embodiment is basically consistent with the method in Embodiment 1. In the expansion state, the flow rate is reduced to 30% of the normal flow rate, and the lower flow rate ensures that the tiny particles of chemical residue are fully deposited. In the constriction state, the flow rate is increased to 5 times the normal flow rate. The high flow rate combined with high-frequency ultrasound removes the chemical residue particles with strong adhesion. The waste discharge interval is increased by 1.7 times. In the liquid preparation scenario, the pollutants are deposited quickly, and the deposition time is extended in the later stage to capture the continuously generated residual particles. When the waste discharge pressure fluctuation is ≤0.0008MPa for 4 consecutive times, the main pipeline is judged to be clean, which meets the stringent requirements of electronic grade high-purity chemical liquid preparation for particle content, that is, the particle size is ≤50nm.

[0065] Example 3

[0066] This embodiment discloses a directional deposition and flushing system for pollutants based on variable interval waste discharge, applicable to the cooling water supply scenario of precision instruments.

[0067] The structural design and parameter configuration of the intelligent flushing system in this embodiment are as follows, and other structural settings are the same as in Embodiment 1.

[0068] In the intelligent control module, the response delay T1 is set to 12ms, the initial value of the waste discharge interval t0 is 40min, and the increment coefficient k is 1.2; during the complete determination of cavity waste discharge, the number of times threshold m is 4 times, the fluctuation threshold ΔP3 is 0.0015MPa / s, and the pressure change rate calculation interval T3 is 0.6s; during the main pipeline cleaning determination, the number of times threshold n is 3 times, the fluctuation threshold ΔP2 is 0.0015MPa; and the self-inspection waste discharge interval T4 is 6h.

[0069] In the variable diameter deposition module, the flexible pipe is made of ultra-clean flexible fluororubber with a thickness of 2mm, which is suitable for a 12mm diameter main pipeline. The lower limit of pipe shrinkage β=30% and the upper limit of pipe expansion α=220%. In the actual control process, the diameter of the flexible pipe in the expansion state is 18mm and the diameter of the flexible pipe in the shrinkage state is 8.4mm. In the microcavity array, the depth of the microcavity h1=80μm, the opening width of the microcavity w1=150μm, the central angle of the adjacent microcavities in the circumferential direction is 12°, the spacing between the adjacent microcavities in the axial direction is 150μm, and the total number of microcavities is 80.

[0070] In the ultrasonic-assisted waste removal module, two ultrasonic transducers are fixed to the rigid outer shell by heat-insulating connecting rods. The transducers do not directly contact the flexible pipe wall. The ultrasonic transducer vibration frequency f1=25kHz and amplitude A1=5μm. The high-frequency power supply output voltage U1=12V and output current I1=0.8A.

[0071] In the waste discharge detection module, the filter has a filtration accuracy of 0.2μm and the filter element material is glass fiber; the differential pressure sensor has an accuracy of ΔP1=0.0002MPa and a data acquisition frequency of 40Hz.

[0072] The intelligent flushing method of this embodiment is basically consistent with the method in Embodiment 1, and is suitable for cooling fluid scenarios with low viscosity and low pollution load. In the expansion state, the flow rate is reduced to 60% of the normal flow rate to avoid excessive speed reduction affecting cooling efficiency; in the contraction state, the flow rate is increased to twice the normal flow rate, combined with low-amplitude ultrasonic vibration to avoid the impact of high flow rate on the cooling system; the waste discharge interval increment coefficient k=1.2 ensures sufficient deposition of trace pollutants; after three consecutive waste discharge pressure fluctuations meet the standard, the main pipeline is determined to be clean, ensuring the stable operation of the precision instrument cooling system.

[0073] Example 4

[0074] This embodiment discloses a pollutant-directed deposition and flushing system based on variable interval waste discharge in the application of water supply in photovoltaic cell production.

[0075] The structural design and parameter configuration of the intelligent flushing system in this embodiment are as follows, and other structural settings are the same as in Embodiment 1. In the intelligent control module, the response delay T1 is set to 18ms, the initial value of the waste discharge interval t0 is set to 90min, and the increment coefficient k is set to 1.6; during the complete waste discharge determination process of the concave cavity, the number of times threshold m is set to 7 times, the fluctuation threshold ΔP3 is set to 0.0007MPa / s, and the pressure change rate calculation interval T3 is set to 0.3s; during the main pipeline cleaning determination process, the number of times threshold n is set to 5 times, the fluctuation threshold ΔP2 is set to 0.0025MPa; and the self-check waste discharge interval T4 is set to 18h.

[0076] In the variable diameter deposition module, the flexible pipe is made of PTFE composite material with a thickness of 5mm, which is suitable for a 25mm diameter main pipeline; the lower limit of pipe shrinkage β=30%, and the upper limit of pipe expansion α=220%, that is, the diameter of the flexible pipe in the expanded state is 40mm and the diameter of the flexible pipe in the shrinked state is 17.5mm; in the microcavity array, the depth of the microcavity h1=300μm, the opening width of the microcavity w1=600μm, the central angle of the adjacent microcavities in the circumferential direction is 6°, the spacing between the adjacent microcavities in the axial direction is 400μm, and the total number of microcavities is 200.

[0077] In the ultrasonic-assisted waste removal module, eight ultrasonic transducers are fixed to the rigid outer shell via heat-insulating connecting rods, and the transducers do not directly contact the flexible pipe wall; the ultrasonic transducer vibration frequency f1=35kHz, amplitude A1=12μm; the high-frequency power supply output voltage U1=48V, output current I1=3A.

[0078] In the waste discharge detection module, the filter has a filtration accuracy of 0.08μm and the filter element material is polytetrafluoroethylene; the differential pressure sensor has an accuracy of ΔP1=0.0001MPa and a data acquisition frequency of 80Hz.

[0079] The intelligent flushing method of this embodiment is basically consistent with the method in Embodiment 1, and is suitable for high flow rate and medium pollution load scenarios. The expanded capacity state ensures sufficient particle deposition under high flow rate, while the contracted pipe state, combined with multi-vibrator ultrasonic vibration, achieves waste discharge without dead angles in the wide pipe cross-section; the waste discharge interval increment coefficient k=1.6 maximizes the subsequent deposition efficiency; after five consecutive waste discharge pressure fluctuations meet the standard, the main pipeline is judged to be clean, meeting the dual requirements of flow rate and purity of water supply for photovoltaic cell production.

[0080] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any brief modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A pollutant-directed deposition and flushing system based on variable interval waste discharge, characterized in that, The system includes an intelligent control module, and a pipeline switching module, a waste discharge detection module, a variable diameter deposition module, and an ultrasonic-assisted waste discharge module connected to the intelligent control module via signals. The variable diameter deposition module includes a flexible pipe and a diameter adjustment component. The flexible pipe includes an input transition section, an output transition section, and an intermediate variable-capacity section, with both ends connected to the main pipeline. The inner surface of the flexible pipe is provided with a micro-cavity array. The diameter adjustment component is used to adjust the diameter of the variable-capacity section. The output end of the flexible pipe is connected to the main pipeline and the waste discharge detection module via the pipeline switching module, which is used to switch the connection state between the output end of the flexible pipe and the main pipeline or the waste discharge detection module. The ultrasonic-assisted waste discharge module is used to apply ultrasonic vibration to the flexible pipe. The waste discharge detection module is used to detect pressure changes in the ultrasonic-assisted waste discharge module during the waste discharge process.

2. The system according to claim 1, characterized in that, The intelligent control module is configured as follows: a) Dynamically update the waste discharge interval t based on the preset initial waste discharge interval t0 and the increment coefficient k. n+1 =t n ×k, where t n This represents the time interval between the nth and (n+1)th waste discharges; b) Based on the pressure data fed back by the waste discharge detection module, determine whether a single waste discharge is complete by calculating whether the rate of change of the first derivative of the pressure is lower than the first threshold. c) Based on the pressure data fed back by the waste discharge detection module after multiple consecutive waste discharges, determine whether the main pipeline is clean overall by calculating whether the rate of change of the first derivative of the pressure is continuously lower than the second threshold.

3. The system according to claim 1, characterized in that, In the microcavity array, the microcavities are uniformly arranged circumferentially and staggered axially. The depth h1 of the microcavities satisfies 80μm≤h1≤300μm, and the opening width w1 satisfies 150μm≤w1≤600μm. The central angle between adjacent circumferential microcavities is 6°~12°, the spacing between adjacent axial microcavities is 150μm~400μm, and the microcavity array contains a total of 80~200 microcavities.

4. The system according to claim 1, characterized in that, The flexible pipe is made of ultra-clean flexible material, which includes fluororubber and PTFE composite material. The thickness of the flexible pipe is 2~5mm. Its diameter is adapted to the main pipeline when it is not expanded or contracted. The upper limit of the diameter expansion that the variable capacity section can achieve in the expansion state is not less than 200% of the diameter of the main pipeline, and the lower limit of the diameter contraction that can be achieved in the contraction state is not greater than 80% of the diameter of the main pipeline.

5. The system according to claim 1, characterized in that, The pipe diameter adjustment assembly includes a stepper motor and multiple movable frames. The movable frames are driven by the stepper motor through a transmission rod to achieve height adjustment. The variable capacity section of the flexible pipe is fixed with a rigid shell, and the movable frames are connected to the rigid shell through a cover plate.

6. The system according to claim 1, characterized in that, The ultrasonic-assisted waste removal module includes at least one ultrasonic transducer, a connecting rod, and a high-frequency power supply. The ultrasonic transducer is connected to the rigid outer shell of the flexible pipe through the connecting rod, and the high-frequency power supply is electrically connected to the ultrasonic transducer.

7. The system according to claim 1, characterized in that, The waste discharge detection module includes a waste discharge branch, a filter connected in series on the waste discharge branch, and pressure detection components installed at both ends of the filter. The pressure detection components are signal-connected to the intelligent control module. The pipeline switching module is a two-position three-way valve.

8. The system according to claim 7, characterized in that, The filter has a filtration accuracy of not less than 0.05 μm and not more than 0.2 μm, the pressure detection component has a measurement upper limit of not less than 0.1 MPa, a measurement accuracy of not less than 0.0002 MPa, and an acquisition frequency of not less than 40 Hz.

9. A method for directional deposition and flushing of pollutants based on the system of claim 2, characterized in that, Includes the following steps: S1: The intelligent control module controls the variable diameter deposition module to switch to the expansion state and controls the pipeline switching module to connect the flexible pipeline to the main pipeline. Fluid flows through the flexible pipeline, and particles of different diameters are deposited in layers in the micro-cavity array. S2: When the current waste discharge interval is reached, the intelligent control module controls the pipeline switching module to connect the flexible pipeline with the waste discharge detection module, and controls the variable diameter deposition module to switch to the pipe shrinking state; S3: Activate the ultrasonic-assisted waste removal module to apply ultrasonic vibration to the flexible pipe to assist in the removal of sediment; S4: The waste discharge detection module monitors the pressure change at both ends of the filter during the waste discharge process. When the pressure change rate is lower than the first preset threshold multiple times in a row, it is determined that a single waste discharge is completed, and the current stable pressure value is recorded. S5: According to formula t n+1 =t n ×k updates the waste discharge interval, controls the pipeline switching module to switch to the expansion state, and the variable diameter deposition module connects the flexible pipeline to the main pipeline; S6: Repeat steps S2-S5. When the fluctuation range of the recorded stable pressure value is lower than the second preset threshold after multiple waste discharges, it is determined that the main pipeline is clean, and the variable diameter deposition module is controlled to switch to the normal flow state with the same diameter as the main pipeline.

10. The method according to claim 9, characterized in that, After determining that the main pipeline is clean in step S6, the self-inspection and waste discharge process of steps S2-S4 is periodically executed according to the preset self-inspection cycle. If the pressure change rate at both ends of the filter is detected to be higher than the first preset threshold multiple times during the self-inspection and waste discharge, steps S1-S6 are restarted.

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