Ethylene glycol spray on-line refiltering device

Abstract

The present application relates to the technical field of ethylene glycol spraying, and specifically discloses an ethylene glycol spraying online re-filtering device, which comprises a shunt cylinder, a plurality of spraying pipes for ethylene glycol medium conveying are arranged through the inside of the shunt cylinder, and an electric control valve body is arranged at one end of each spraying pipe close to the shunt cylinder; a spraying mechanism for ethylene glycol spraying is uniformly embedded at the bottom end of each spraying pipe at equal intervals, and a connecting pipe is arranged through the bottom end of each spraying pipe; the device is assembled without welding by cooperation of the abutment groove, the permanent magnetic half ring, the magnetic gathering plate and the hoop, can realize vibration self-cleaning by means of the filtering tooth pieces and the fluid pulsation, can timely strip the oligomer flocculation, can delay the filter material blockage, can effectively make up the failure loophole of the total pipe centralized filtration, can reduce the impurity flow to the spray head from the source, can reduce the problems of spray head coking, shrinkage and uneven liquid distribution, can prolong the continuous operation period of the polyester ethylene glycol spraying device, can reduce the frequency of shutdown disassembly and maintenance, and can compress the on-site operation and maintenance manpower and material input.

Description

Technical Field

[0001] This invention relates to the field of ethylene glycol spraying technology, and in particular to an online re-filtration device for ethylene glycol spraying. Background Technology

[0002] Ethylene glycol spraying is a circulating process using ethylene glycol as the spray medium. It is primarily used for treating the exhaust gas from polyester polycondensation vacuum processes, and can also be used for cooling and pipeline flushing. Low-temperature ethylene glycol is transported by a circulating pump and atomized and sprayed downwards from the nozzles. This allows for thorough contact and heat exchange with the upward-flowing process gas phase, rapidly condensing the ethylene glycol vapor within the gas phase. Simultaneously, it captures impurities such as oligomers and monomers entrained in the gas flow, achieving gas phase purification and protecting the downstream vacuum unit from blockage and contamination. The sprayed ethylene glycol is collected in a storage tank, filtered, cooled through heat exchange, and then returned to the nozzles for reuse.

[0003] In the existing technology, fine particles that cannot be filtered by the filter screen, as well as some substances dissolved in ethylene glycol, will slowly precipitate out and adhere to the inner tube of spray pipe I, reducing the pipe diameter and affecting the flow rate and spraying effect. An existing patent application (CN202510520299.1) describes a circulating spray system for ethylene glycol. When the inside of the spray pipe needs to be cleaned, the system controls the valve to allow cold ethylene glycol (the plate heat exchanger can also cool the ethylene glycol) to continue spraying through the jacketed spray pipe into the vertical cylinder. Then, hot ethylene glycol at a temperature above 120°C is allowed to pass through the inside of the spray pipe and spray into the vertical cylinder, thus cleaning the inside of the spray pipe.

[0004] To address the aforementioned issues, while existing patents offer solutions that can clean the interior of the spray pipes through the cooperation of components such as jacketed spray pipes, in actual use, the circulating ethylene glycol medium contains a large number of oligomers, carbonized particles, and other impurities. During long-term continuous operation, these impurities tend to gradually adhere and deposit at the edges of the spray head outlet orifices and on the cone cap distribution plate, resulting in coking and material buildup. As the deposits continue to accumulate and thicken, they directly cause problems such as reduced spray flow and uneven liquid distribution. The deposits can also spread and accumulate inside the outlet orifices, causing progressive narrowing of the spray pipe outlet orifices. In severe cases, this can lead to blockage of the channels, directly damaging the performance of the entire spray system. Summary of the Invention

[0005] The purpose of this invention is to provide an online re-filtration device for ethylene glycol spraying, which can achieve self-cleaning through vibration with the help of fluid pulsation using filter teeth, promptly removing oligomer flocs, delaying filter media clogging, effectively compensating for the failure of centralized filtration in the main pipe, reducing impurities flowing to the nozzles from the source, alleviating problems such as nozzle coking, pinholes, and uneven liquid distribution, extending the continuous operation cycle of the polyester ethylene glycol spraying device, reducing the frequency of downtime for disassembly and maintenance, and compressing on-site maintenance manpower and material input, thereby solving the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an online re-filtration device for ethylene glycol spraying, comprising a distribution cylinder, with multiple spray pipes for conveying ethylene glycol media extending from the inside of the distribution cylinder, and an electrically controlled valve body provided at one end of each spray pipe near the distribution cylinder, and an ethylene glycol spraying mechanism evenly embedded at the bottom end of the spray pipe. The spraying mechanism includes a connecting pipe that extends out of the bottom of the spraying pipe. An integrally formed flow tube for ethylene glycol flow is formed at the bottom of the connecting pipe. The outer wall of the flow tube is CNC-milled with a docking groove for pre-reserved placement space. A split samarium cobalt permanent magnet semi-ring is inserted into the docking groove. A hollow stainless steel mounting base is inserted into the flow tube. Two connecting blocks are equidistantly arranged and staggered in layers inside the mounting base. A filter tooth composed of iron-gallium magnetostrictive alloy sheet is fixedly installed at one end of the connecting block. The filter tooth is covered with a porous membrane of PTFE material.

[0007] Preferably, a magnetic plate for optimizing the magnetic circuit and preventing dispersion is fixedly installed on the outer wall of the permanent magnet semi-ring, a clamp for pressing and fixing the permanent magnet semi-ring is fixedly installed on the outer wall of the flow pipe by bolts, a limiting block for preventing self-rotation and displacement is fixedly installed on the outer wall of the mounting base corresponding to the reserved groove of the flow pipe, and an ethylene glycol spray nozzle is fixedly installed at the bottom end of the flow pipe.

[0008] Preferably, a metal ring is fixedly installed above the mounting base inside the flow tube, and a flexible bushing made of PTFE material that can engage with the metal ring is fixedly installed at the top of the mounting base.

[0009] Preferably, the end of the connecting pipe that enters the spray pipe is integrally formed with a guide tube, and an adsorption mechanism for pre-separating magnetic impurities is provided above the metal ring inside the flow pipe.

[0010] Preferably, the adsorption mechanism includes an insertion block, which is uniformly and evenly fixedly installed above the inside of the flow tube, and one end of the insertion block is fixedly installed with a conical magnetic convex ridge made of industrial pure iron soft magnetic material, and the magnetic convex ridge is covered with a protective layer formed by chemical nickel plating for corrosion protection.

[0011] Preferably, a micro-blind hole is provided at the end of the filter disc away from the connecting block, and permanent magnet particles made of sintered samarium cobalt permanent magnet alloy are press-fitted into the micro-blind hole.

[0012] Preferably, the bottom end of the flow tube is fixed with a sealing ring with a pre-reserved ethylene glycol flow channel annular structure, and a blocking mechanism for impurity collection is provided above the sealing ring.

[0013] Preferably, the blocking mechanism includes a sealing cylinder, which is fixedly installed on the top of the sealing ring, and a docking ring of an annular mechanism is fixedly installed on the top of the sealing cylinder. A docking post that engages and limits the mounting base is fixedly installed around the top of the docking ring at equal intervals.

[0014] Preferably, a guide block with a conical structure that is fixed to the sealing ring is fixedly installed inside the lower part of the sealing cylinder, and a collection groove for collecting impurities is opened inside the guide block, and an arc-shaped block for guiding impurities to slide down is fixedly installed at the top of the guide block.

[0015] Preferably, the top of the arc-shaped block is fitted with a filter bushing made of a porous matrix formed by sintering of ductile alloy powder, and the filter bushing has a flow hole for ethylene glycol to flow through at the bottom axial position.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention achieves weld-free external assembly through the cooperation of docking groove, permanent magnet semi-ring, magnetic plate and clamp. It can achieve vibration self-cleaning by means of fluid pulsation with the help of filter teeth, timely remove oligomer flocs, delay filter material clogging, effectively make up for the failure of centralized filtration in the main pipe, reduce impurities from the source to the nozzle, reduce nozzle coking, pinholes and uneven liquid distribution, extend the continuous operation cycle of polyester glycol spraying device, reduce the frequency of downtime disassembly and maintenance, and reduce on-site operation and maintenance manpower and material input. 2. The present invention can suppress fluid eddy current interference through the guide tube, ensuring the stability of magnetic separation of the adsorption mechanism. The magnetic convex ridge supported by the insert block realizes the pre-separation of magnetic impurities, effectively sharing the processing load of the filter tooth plate. The protective layer protects the magnetic convex ridge substrate from high temperature ethylene glycol corrosion, eliminates secondary impurity pollution caused by substrate rust and peeling, and maintains magnetic separation capability for a long time. 3. This invention integrates media flow, component load-bearing, and boundary sealing into a single encapsulation ring, improving the overall integration of the blocking mechanism. The modular assembly is achieved through the interlocking positioning of the docking ring and docking post, avoiding welding operations and facilitating later disassembly, inspection, and maintenance. Simultaneously, it ensures the coaxiality of the sealing cylinder and upstream components, eliminating flow field distortion caused by assembly eccentricity. The arc-shaped block homogenizes the fluid, weakening turbulent impact and ensuring uniform media action on the filter liner. The collection groove can collect and temporarily store detached impurities, preventing backflow and secondary contamination of the filter liner, and reducing the risk of instantaneous clogging caused by repeated particle scouring. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in 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 the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is an overall structural view of the present invention; Figure 2 This is a schematic diagram of the structure of the spray pipe of the present invention; Figure 3 This is a schematic diagram of the flow tube structure of the present invention; Figure 4 This is a schematic diagram of the permanent magnet semi-ring structure of the present invention; Figure 5 This is a schematic diagram of the connecting block of the present invention; Figure 6 This is a schematic diagram of the porous membrane structure of the present invention; Figure 7 This is a schematic diagram of the structure of the docking post of the present invention; Figure 8 This is a schematic diagram of the flow hole structure of the present invention.

[0019] Explanation of reference numerals in the attached figures: 1. Diverter cylinder; 2. Spray pipe; 3. Electrically controlled valve body; 4. Spraying mechanism; 5. Guide cylinder; 6. Adsorption mechanism; 7. Sealing ring; 8. Blocking mechanism; 401. Connecting pipe; 402. Flow pipe; 403. Docking groove; 404. Permanent magnet semi-ring; 405. Mounting base; 406. Connecting block; 407. Filter toothed plate; 408. Porous membrane; 409. Magnetizing plate; 410. Clamping clamp; 4 11. Limiting block; 412. Nozzle; 413. Metal ring; 414. Flexible bushing; 601. Insertion block; 602. Magnetic guide ridge; 603. Protective layer; 604. Micro blind hole; 605. Permanent magnet microparticles; 801. Sealing cylinder; 802. Docking ring; 803. Docking post; 804. Guide block; 805. Receiving groove; 806. Arc-shaped block; 807. Filter bushing; 808. Flow hole. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0021] This invention provides a technical solution: Please see Figures 1 to 6 An online ethylene glycol spraying and refiltration device includes a distribution cylinder 1, through which multiple spray pipes 2 for conveying ethylene glycol extend. Each spray pipe 2 near the distribution cylinder 1 is equipped with an electrically controlled valve body 3. Ethylene glycol spraying mechanisms 4 are evenly and equidistantly embedded at the bottom of each spray pipe 2. The spraying mechanism 4 includes a connecting pipe 401 extending from the bottom of each spray pipe 2. An integrally formed flow pipe 402 for ethylene glycol flow is formed at the bottom of the connecting pipe 401. The outer wall of the flow pipe 402 is CNC-milled with a pre-reserved mounting groove 403. A split samarium cobalt permanent magnet semi-ring 404 is inserted inside the groove 403. A hollow stainless steel mounting base 405 is inserted inside the flow pipe 402. Two layers of connecting blocks are evenly arranged and staggered inside the mounting base 405. 406. A filter tooth 407 made of iron-gallium magnetostrictive alloy sheet is fixedly installed at one end of the connecting block 406. The filter tooth 407 is covered with a porous membrane 408 made of PTFE material. A magnetic focusing plate 409 for optimizing the magnetic circuit and preventing divergence is fixedly installed on the outer wall of the permanent magnet semi-ring 404. A clamp 410 for pressing and fixing the permanent magnet semi-ring 404 is fixedly installed on the outer wall of the flow tube 402 by bolts. A limiting block 411 for preventing self-rotation and deviation is fixedly installed on the outer wall of the mounting base 405 corresponding to the reserved groove of the flow tube 402. An ethylene glycol spray nozzle 412 is fixedly installed at the bottom end of the flow tube 402. A metal ring 413 is fixedly installed above the mounting base 405 inside the flow tube 402. A flexible bushing 414 made of PTFE material that can engage with the metal ring 413 is fixedly installed at the top of the mounting base 405.

[0022] By adopting the above technical solution, the spray mechanism 4 serves as the core unit for single-path media processing in this device. After the media is output from the diversion cylinder 1, it is transported through the spray pipe 2. The on / off control of the media in each branch is achieved by the electric control valve body 3. The media is further introduced into the flow pipe 402 through the connecting pipe 401. The docking groove 403 on the outer wall of the flow pipe 402 is used to position and install the permanent magnet semi-ring 404. It is combined with the magnetic plate 409 to constrain the magnetic field diffusion range. Then, the clamp 410 is used to complete the fastening and locking, thus constructing a stable static bias magnetic field throughout the entire domain. The inner cavity of the flow pipe 402 is equipped with the mounting base 405, which is circumferentially limited and prevented from deviating by the limiting block 411. The mounting base 405, with the help of connecting block 406, completes the layered fixation of the filter teeth 407. The outer surface of the filter teeth 407 is covered with a porous membrane 408. The upper end of the base is equipped with a metal ring 413 and a flexible bushing 414 to form an axial seal to prevent media bypass leakage. The ethylene glycol medium purified by this unit is finally sprayed outward from the nozzle 412. During online operation, the constant magnetic field output by the permanent magnet semi-ring 404 serves as the excitation source, giving the filter teeth 407 a basis for magnetostrictive response. The circulating ethylene glycol flow generates fluid pulsating load, driving the filter teeth 407 to produce periodic flexural vibration, which, in conjunction with the porous membrane 408, causes the filter teeth 407 to vibrate periodically. The porous membrane 408's interception capability completes the coarse filtration operation, relying on vibration to peel off the oligomer flocs adhering to the surface of the porous membrane 408; the limiting block 411 can stably install the spatial posture of the base 405, ensuring that the relative orientation of the filter teeth 407 and the magnetic field is always within the high-efficiency response range; the metal ring 413 and the flexible bushing 414 work together to construct a reliable radial sealing interface, forcing all process media to pass through the porous membrane 408 to complete filtration and purification, preventing untreated media from directly escaping to the nozzle 412; the magnetic plate 409 effectively compresses magnetic field dispersion loss, concentrating the limited permanent magnet magnetic field energy to act inside the flow tube 402. Functional components enhance the working efficiency of magneto-fluid coupling. The clamp 410 and the docking groove 403 cooperate to achieve the weld-free external assembly of the permanent magnet semi-ring 404. During the modification phase, no destructive processing of the spray pipe 2 body is required, avoiding the risk of impurities directly reaching the nozzle 412 after the failure of the main pipe centralized filtration. Each spray mechanism 4 is independent of each other, and the performance degradation of a single group will not interfere with the normal operation of the other spray pipes 2. It significantly suppresses coking, pinholes, and liquid distribution imbalance at the nozzle 412 position, effectively extending the long-cycle operation of the polyester glycol spray system, reducing the frequency of equipment downtime for disassembly and cleaning, and reducing the manpower and material consumption for on-site maintenance.

[0023] Specifically, such as Figures 3 to 5As shown, the end of the connecting pipe 401 that penetrates into the spray pipe 2 is integrally formed with a guide tube 5. An adsorption mechanism 6 for pre-separating magnetic impurities is provided above the metal ring 413 inside the flow pipe 402. The adsorption mechanism 6 includes an insertion block 601, which is uniformly and evenly fixedly installed inside the flow pipe 402. A conical magnetic convex rib 602 made of industrial pure iron soft magnetic material is fixedly installed at one end of the insertion block 601. The magnetic convex rib 602 is covered with a protective layer 603 formed by chemical nickel plating for corrosion prevention. A micro blind hole 604 is opened at the end of the filter tooth 407 away from the connecting block 406. A permanent magnet particle 605 made of sintered samarium cobalt permanent magnet alloy is pressed into the micro blind hole 604.

[0024] By adopting the above technical solution, the guide tube 5 is set at the medium inflow end of the connecting pipe 401, which can rectify and level the ethylene glycol fluid entering the adsorption mechanism 6, reduce the eddy current disturbance of the pipeline flow, and ensure that the medium can contact the functional parts of the adsorption mechanism 6 smoothly and evenly. The adsorption mechanism 6 is arranged in the upstream area of ​​the inner cavity of the flow pipe 402. Multiple sets of penetrating blocks 601 are evenly distributed and fixed to the inner wall of the flow pipe 402. The end of the penetrating block 601 is equipped with a tapered magnetic convex rib 602. The surface of the magnetic convex rib 602 is covered with a protective layer 603 prepared by chemical nickel plating. With the help of the penetrating magnetization effect of the permanent magnet semi-ring 404 outside the flow pipe 402, the adsorption mechanism 6 can achieve the desired effect. The magnetic convex rib 602 constructs a local magnetic field gradient field in the internal flow channel, which performs magnetic traction pre-enrichment treatment on the magnetic carbon slag and metal wear particles mixed in the ethylene glycol medium, causing the magnetic impurities to shift to the side wall area of ​​the flow channel, and pre-stripping some hard magnetic impurities from the mainstream medium, thereby sharing the filtration load of the downstream filter tooth 407. The micro blind hole 604 opened at the end of the filter tooth 407 is internally fitted with permanent magnet particles 605. The permanent magnet particles 605 and the external permanent magnet half ring 404 form a magnetic pole repulsion effect, thereby establishing a magnetic elastic force reference for the adaptive opening and closing of the filter tooth 407, and realizing dynamic adjustment of the tooth gap in conjunction with the fluid pulsation load. The protective layer 603 can isolate the high-temperature ethylene glycol medium from the corrosion and erosion of the magnetic rib 602 substrate, prevent the soft magnetic substrate from rusting and peeling off, and generate secondary impurities. It maintains the long-term stability of the magnetic permeability of the magnetic rib 602. The rectifying effect of the guide cylinder 5 can eliminate the interference of fluid swirl on the magnetic field separation effect and prevent eddy currents from carrying magnetic impurities directly to the downstream filter teeth 407. Combined with the magnetic separation capability of the magnetic rib 602, it greatly reduces the probability of the coarse filter unit being impacted and worn by hard particles. The permanent magnet particles 605 are completely embedded in the micro blind holes. Inside the 604 stainless steel, there is no direct contact with the high-speed flowing ethylene glycol medium, avoiding magnet erosion and detachment, and ensuring the long-term stability of the magnetic repulsion reset force. The pre-separation magnetic field and the back-end magnetic repulsion gap adjustment share the same external magnetic field excitation, eliminating the need for additional excitation components. Without significantly increasing pipeline flow resistance, it reduces the amount of impurities retained by downstream filter media and slows down the clogging process. It also relies on the passive magnetic repulsion structure to achieve automatic adaptation of the filtration gap according to the operating conditions, effectively improving the defects of easy clogging and short life of filter elements under polyester conditions, and reducing the number of times the equipment is disassembled for maintenance.

[0025] Specifically, such as Figure 5 , Figure 7 and Figure 8As shown, a sealing ring 7 with a reserved ethylene glycol flow channel is bolted to the bottom end of the flow tube 402. A blocking mechanism 8 for impurity collection is provided above the sealing ring 7. The blocking mechanism 8 includes a sealing cylinder 801, which is fixedly installed at the top of the sealing ring 7. A docking ring 802 with an annular mechanism is fixedly installed at the top of the sealing cylinder 801. A docking post 803 that engages and limits the mounting base 405 is fixedly installed around the top of the docking ring 802 at equal intervals. A guide block 804 with a conical structure and fixed to the sealing ring 7 is fixedly installed inside the lower part of the sealing cylinder 801. An impurity collection groove 805 is opened inside the guide block 804. An arc-shaped block 806 for guiding impurities to slide down is fixedly installed at the top of the guide block 804. A filter bushing 807 with a porous matrix formed by sintering of extensible alloy powder is embedded at the top of the arc-shaped block 806. An ethylene glycol flow hole 808 is opened at the axial position of the bottom end of the filter bushing 807.

[0026] By adopting the above technical solution, the encapsulation ring 7 serves as the bottom supporting base of the blocking mechanism 8, and has an overall ring structure. This retains the central medium flow channel while providing assembly support and boundary sealing constraints for all internal components of the blocking mechanism 8. The blocking mechanism 8 is located downstream of the coarse filter unit. The sealing cylinder 801 is fixedly installed on the upper part of the encapsulation ring 7. A docking ring 802 is set at the top of the sealing cylinder 801, and multiple ring-shaped docking posts 803 engage with the upstream mounting base 405 to lock the axial position, ensuring that the blocking mechanism 8 and the upstream coarse filter assembly are strictly coaxial. This eliminates the flow field distortion problem caused by assembly eccentricity. After the medium flows downwards, the fluid first contacts the arc-shaped block 806. The arc-shaped block 806 uses a smooth slope to homogenize and guide the incoming flow, eliminating local turbulent flow impacts and allowing the medium to spread evenly on the upper surface of the filter bushing 807. The filter bushing 807 adopts... The porous matrix obtained by sintering magnetostrictive alloy powder undergoes periodic micron-scale expansion and contraction deformation under the synergistic effect of the magnetic field excitation of the external permanent magnet semi-ring 404 and the alternating fluid pressure. It relies on the tortuous channels inside the matrix to capture the fine hard particles remaining in the ethylene glycol medium to achieve fine filtration. The reciprocating expansion and contraction motion of the channels can loosen and release the particles embedded in the pores, achieving a passive self-cleaning effect. The filtered medium is discharged downward through the flow hole 808 opened on the axis of the filter bushing 807. The floc particles shaken off by the upstream filter tooth plate 407 and the solid impurities peeled off from the filter bushing 807 slide down along the inclined surface of the arc block 806 and settle into the collection groove 805 formed by the guide block 804 for centralized temporary storage, effectively inhibiting the phenomenon of the detached impurities being re-entrained into the mainstream medium and flowing back upward, causing secondary pollution of the filter bushing 807. The blocking mechanism 8 achieves modular quick-installation positioning through the snap-fit ​​structure of the docking column 803, eliminating the need for complex welding processes and facilitating subsequent disassembly, inspection, and maintenance. The collection tank 805 isolates and temporarily stores fallen impurities, preventing them from repeatedly circulating and scouring the surface of the filter bushing 807, significantly reducing the risk of instantaneous clogging of the fine filter element. The filter bushing 807 relies on a shared external magnetic field to achieve deformation self-cleaning, eliminating the need for additional driving components. While achieving deep interception of fine particles, it continuously maintains the filtration flux. The encapsulation ring 7 serves multiple functions, including flow, load-bearing, and sealing, significantly improving the integration of the entire blocking mechanism 8. It can further block impurities from reaching the nozzle 412 from the end, greatly alleviating the working conditions of pinholes and coking at the nozzle 412, and improving the stability of the entire spray filtration device for long-term continuous operation. Only periodic disassembly and cleaning of the internal parts are required.

[0027] Working principle: Ethylene glycol medium is distributed and transported to each branch spray pipe 2 by the distribution cylinder 1. After the branch opening and flow rate are regulated by the main body of the electric control valve 3, it first flows through the insertion thermal flow sensor and the upstream pressure transmitter installed in the downstream straight pipe section of the spray pipe 2 to complete the real-time acquisition of the branch flow rate and inlet pressure online. Then, it is rectified and stabilized by the guide cylinder 5 at the top of the connecting pipe 401. After being rectified and stabilized by the guide cylinder 5 at the top of the connecting pipe 401, it enters the flow pipe 402 to complete multi-stage filtration and self-cleaning linkage online, and finally is evenly sprayed out through the nozzle 412. The externally mounted split-type samarium cobalt permanent magnet semi-ring 404 adopts an axial magnetization process and is embedded in the docking groove 403 on the outer wall of the flow pipe 402. The outer side is equipped with an arc-shaped magnetic focusing plate 409 made of industrial pure iron to gather the magnetic circuit and reduce magnetic field divergence. It is held and fixed by a clamp 410 to maintain the installation position accuracy. A single static magnetic field source acts on multiple functional components in the flow pipe 402 at the same time, realizing fully passive magnetic coupling linkage. No additional electrical control or external energy is required, and it is suitable for on-site modification without changing the main pipeline system. The fluid first flows through the upper adsorption mechanism 6. Multiple sets of through-blocks 601 are fixed circumferentially to the inner wall of the flow pipe 402. The tapered magnetic convex ribs 602 at their ends are made of industrial pure iron soft magnetic material. After being magnetized by the external permanent magnet semi-ring 404, they form a local high gradient magnetic field in the flow channel, which can pull and enrich the magnetic carbon slag and metal wear particles entrained in ethylene glycol towards the pipe wall. The enriched magnetic impurities settle downward along the annular gap between the magnetic convex ribs 602 and the pipe wall, without entering the central mainstream filtration zone. This completes the pre-separation of magnetic impurities in advance, directly reducing the retention load of the downstream filter material and extending the effective working cycle of the filter element. The magnetic convex ribs 602 are covered with a protective layer 603 formed by chemical nickel plating, which can withstand the high temperature corrosion of ethylene glycol, avoid the soft magnetic substrate from rusting and failing after long-term immersion, and ensure the long-term stability of magnetic separation performance. After pre-separation, the fluid flows downward through the sealing mating surface formed by the metal ring 413 and the PTFE flexible bushing 414 at the top of the mounting base 405. The flexible bushing 414 adopts a stepped interlocking structure and fits tightly with the metal ring 413, which can compensate for the sealing gap caused by the long-term high-temperature creep of PTFE, prevent the fluid from bypassing the outer wall of the base, and ensure that all fluid enters the filter chamber. The mounting base 405 is engaged with the groove on the inner wall of the flow pipe 402 by the outer wall limiting block 411 to prevent circumferential deflection and ensure the accuracy of the correspondence between the filter teeth and the magnetic field direction. Inside the base, two layers of iron-gallium magnetostrictive filter teeth 407 are fixed by the upper and lower staggered connecting blocks 406. The two layers of filter teeth are arranged in a circumferential staggered manner and the magnetic pole direction is consistent to avoid mutual interference of the magnetic field between the layers. The filter teeth are covered with a PTFE porous membrane 408. The porous structure intercepts flaky oligomers and flocculent large particle impurities to complete coarse filtration. The low surface energy characteristics of PTFE can inhibit the coking and adhesion of oligomers, which greatly reduces the risk of impurity accumulation and scaling. The filter teeth 407 have micro-blind holes 604 at their free ends, with sintered samarium cobalt permanent magnet particles 605 pressed into them. The magnetic poles of these particles are aligned with the inner poles of the outer permanent magnet semi-ring 404, creating a static magnetic repulsion force that provides a reference for the filter teeth to expand and reset. The initial tooth gap is adapted to the rated flow condition, with an adjustment range covering 30% to 120% of the rated flow. When the fluid flow increases, the fluid thrust overcomes the magnetic repulsion force, causing the filter teeth to contract and reduce the tooth gap, simultaneously improving filtration accuracy. When the flow decreases, the magnetic repulsion force expands the filter teeth, increasing the flow gap and reducing flow resistance. This passive, self-adaptive adjustment of the filter gap is achieved throughout the entire process, balancing flow capacity and filtration efficiency under different operating conditions. The result is that the external permanent magnet semi-ring 404 provides a bias magnetic field for the iron-gallium filter teeth. The static bias magnetic field keeps the filter teeth in a pre-magnetized state. The pulsating impact of the circulating fluid brings alternating loads, and the superimposed magnetostrictive effect drives the filter teeth to generate reciprocating flexural micro-vibrations with the same frequency as the fluid pulsation. The pulsating impact of the circulating fluid coupled with the magnetic field causes the filter teeth 407 to generate reciprocating flexural micro-vibrations, continuously shaking off impurities attached to the surface of the PTFE porous membrane 408, completing the self-cleaning of the coarse filtration stage. The vibration phase of the upper and lower staggered filter teeth has an inherent difference, avoiding fatigue damage caused by resonance at the same frequency, and avoiding the flow attenuation caused by scale accumulation on the surface of the filter teeth. The filtered fluid continues downward into the blocking mechanism 8. The sealing cylinder 801 is fixed above the bottom sealing ring 7. The top docking ring 802 is engaged and positioned with the mounting base 405 by the surrounding docking posts 803, ensuring the coaxial assembly accuracy of the two-stage filtration units. After the fluid diffuses evenly along the guide slope of the arc-shaped block 806, it enters the top-mounted filter bushing 807. This bushing is a porous matrix formed by sintering cobalt-vanadium magnetostrictive alloy powder, with a porosity controlled at 28% to 32% and an average pore diameter of 5 mm. ~10μm, under the combined action of the magnetic field excitation of the same external permanent magnet semi-ring 404 and the alternating pressure of the fluid, the porous framework produces periodic micron-level expansion and contraction deformation. It traps fine hard particles through tortuous channels to complete fine filtration. Its magnetostrictive response frequency has an inherent difference from that of the iron-gallium filter teeth. The expansion and contraction phase of the porous framework lags behind the vibration phase of the filter teeth. When the filter teeth shake off impurities and reach the end face of the bushing, the bushing channels are exactly in an expanded state, which helps the impurities slide out with the surface fluid. At the same time, the channels reciprocate to expand and contract. The filter removes trapped particles, preventing impurities from becoming embedded and causing permanent pore blockage. This achieves passive self-cleaning of the pores during the fine filtration stage, maintaining filtration flux long-term without disassembly or backwashing. The filtered clean ethylene glycol flows downwards through the flow holes 808 at the bushing shaft. A downstream pressure transmitter is installed on the side wall of the spray chamber downstream of the flow pipe 402, working in pairs with the upstream pressure transmitter to calculate the overall pressure difference of the filter assembly in real time. Finally, it is evenly sprayed from the nozzles 412 at the bottom of the flow pipe 402. Large particles shaken off by the filter teeth and trapped by the bushing are removed. Particulate impurities slide down the slope of the arc-shaped block 806 and fall into the collection groove 805 inside the cone-shaped guide block 804 below for temporary storage. The collection groove 805 adopts a narrow-at-the-top and wide-at-the-bottom constriction structure with an annular baffle at the groove opening. After the impurities settle, they are not easily rolled up again by the main fluid eddy. Only periodic disassembly and cleaning are required to prevent impurities from being lifted up again with the fluid and clogging the fine filter element. The encapsulation ring 7 is an annular structure with a reserved central flow channel, while providing bottom support and sealing constraints for the internal components to ensure the overall structural assembly reliability. The entire device relies on a single external permanent magnet semi-ring 404 to provide a static magnetic field source, sequentially realizing multi-stage linkage of magnetic impurity pre-separation, magnetic repulsion adaptive coarse filtration, magnetostrictive vibration self-cleaning, porous fine filtration, and pore self-cleaning. The entire process requires no external power supply or independent flushing medium, relying entirely on the pulsating energy of the process fluid itself and the coupling of the magnetic field for drive. The accompanying online water pressure and flow monitoring system can upload branch flow and pressure difference data before and after filtration in real time. When the pressure difference continues to rise and the flow rate decreases to a set threshold, a blockage warning is automatically triggered, which can be linked to the main body of the electrically controlled valve 3 to complete the single branch cutoff, realizing branch maintenance without shutting down the system. Each branch is independently equipped with a filtration unit, and a single branch failure does not affect the operation of the overall spray system. It can effectively intercept oligomers, carbonized particles, and metal debris in ethylene glycol, significantly alleviate the problems of coking and shrinkage at the liquid outlet of the nozzle 412 and uneven liquid distribution, extend the continuous operation cycle of the spray system, and reduce the frequency of on-site disassembly and maintenance.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An online re-filtration device for ethylene glycol spraying, comprising a diverter (1), characterized in that: Multiple ethylene glycol medium conveying spray pipes (2) extend from the inside of the diversion cylinder (1), and each spray pipe (2) is equipped with an electrically controlled valve body (3) at one end near the diversion cylinder (1). Ethylene glycol spraying mechanism (4) is uniformly embedded at the bottom of the spray pipe (2). The spraying mechanism (4) includes a connecting pipe (401), which extends out of the bottom end of the spraying pipe (2). The bottom end of the connecting pipe (401) is integrally formed with a flow pipe (402) for ethylene glycol flow. The outer wall of the flow pipe (402) is CNC milled with a docking groove (403) for reserved placement space. A split samarium cobalt permanent magnet semi-ring (404) is inserted into the docking groove (403). A hollow stainless steel mounting base (405) is inserted into the flow pipe (402). Two connecting blocks (406) are equidistantly arranged and staggered in the interior of the mounting base (405). A filter tooth (407) composed of iron-gallium magnetostrictive alloy sheet is fixedly installed at one end of the connecting block (406). The filter tooth (407) is covered with a porous membrane (408) of PTFE material.

2. The ethylene glycol spray online re-filtration device according to claim 1, characterized in that: The outer wall of the permanent magnet semi-ring (404) is fixedly installed with a magnetic focusing plate (409) to optimize the magnetic circuit and prevent dispersion. The outer wall of the flow pipe (402) is fixedly installed with a clamp (410) to press and fix the permanent magnet semi-ring (404) by bolts. The outer wall of the mounting base (405) is fixedly installed with a limiting block (411) to prevent self-rotation and deviation in the reserved groove of the flow pipe (402). The bottom end of the flow pipe (402) is fixedly installed with a nozzle (412) for spraying ethylene glycol.

3. The ethylene glycol spray online re-filtration device according to claim 1, characterized in that: A metal ring (413) is fixedly installed above the mounting base (405) inside the flow tube (402), and a flexible bushing (414) made of PTFE material that can engage with the metal ring (413) is fixedly installed at the top of the mounting base (405).

4. The ethylene glycol spray online re-filtration device according to claim 1, characterized in that: The end of the connecting pipe (401) that enters the spray pipe (2) is integrally formed with a guide tube (5), and an adsorption mechanism (6) for pre-separating magnetic impurities is provided above the metal ring (413) inside the flow pipe (402).

5. The ethylene glycol spray online re-filtration device according to claim 4, characterized in that: The adsorption mechanism (6) includes an insertion block (601), which is uniformly and evenly fixedly installed above the inside of the flow tube (402). One end of the insertion block (601) is fixedly installed with a conical structure of a magnetically conductive ridge made of industrial pure iron soft magnetic material. The magnetically conductive ridge (602) is covered with a protective layer (603) formed by chemical nickel plating for corrosion protection.

6. The ethylene glycol spray online re-filtration device according to claim 1, characterized in that: The filter toothed plate (407) has a micro blind hole (604) at one end away from the connecting block (406), and permanent magnet particles (605) of sintered samarium cobalt permanent magnet alloy are press-fitted into the micro blind hole (604).

7. The ethylene glycol spray online re-filtration device according to claim 1, characterized in that: The bottom end of the flow tube (402) is fixed with a sealing ring (7) with a reserved ethylene glycol flow channel ring structure, and a blocking mechanism (8) for impurity collection is provided above the sealing ring (7).

8. The ethylene glycol spray online re-filtration device according to claim 7, characterized in that: The blocking mechanism (8) includes a sealing cylinder (801), which is fixedly installed on the top of the sealing ring (7), and a docking ring (802) of an annular mechanism is fixedly installed on the top of the sealing cylinder (801). A docking post (803) that engages and limits the mounting base (405) is fixedly installed around the top of the docking ring (802) at equal intervals.

9. The ethylene glycol spray online re-filtration device according to claim 8, characterized in that: The sealing cylinder (801) has a guide block (804) fixedly installed at the bottom inside and fixed to the sealing ring (7) with a conical structure. The guide block (804) has a collection groove (805) for collecting impurities. The top of the guide block (804) has an arc-shaped block (806) for guiding impurities to slide down.

10. The ethylene glycol spray online re-filtration device according to claim 9, characterized in that: The top of the arc-shaped block (806) is fitted with a filter bushing (807) made of porous matrix formed by sintering of stretchable alloy powder, and the filter bushing (807) has a flow hole (808) for ethylene glycol flow at the bottom axial position inside.

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