Waste gas treatment device suitable for resin production

Abstract

The invention discloses a waste gas treatment device suitable for resin production, and belongs to the technical field of waste gas treatment. Comprising a collection treatment unit, a dust removal purification unit and a centrifugal fan unit, and aims at the characteristics that resin production waste gas is large in viscosity, high in dust concentration and flammable and explosive, a closed collection space is formed by a feeding port sealing cover and a storage tank body, and a tangential air inlet structure of an ash bucket assembly is matched; dust-containing waste gas forms a rotating flow field before entering a filtering area, and primary grading of coarse and fine particles is achieved through centrifugal force; the blowing equipment arranged at the bottom of the conical ash hopper continuously supplies air upwards, so that resin dust is prevented from hardening and bridging at the conical bottom, the dust is uniformly distributed at the bottom of each filter cartridge through the lifting action of airflow, the overlarge local load is avoided, the micro-negative pressure state in the reaction kettle is maintained, and the risk of escaping organic steam is completely eradicated; the filter cartridge assembly is matched with the pulse ash cleaning system in a vertical installation mode, and dust falling off during ash cleaning directly falls into an ash hopper under the action of gravity.

Description

Technical Field

[0001] This invention relates to the field of waste gas treatment technology, and in particular to a waste gas treatment device suitable for resin production. Background Technology

[0002] The resin production process generates a large amount of dust-laden organic waste gas during the feeding and stirring steps in the reactor. This waste gas not only contains sticky dust particles from the synthetic resin, but also often mixes with solid fillers such as glass fiber and calcium carbonate, and is accompanied by flammable and explosive organic vapors such as styrene and formaldehyde. Due to the strong adhesive and agglomeration characteristics of resin dust, coupled with the large fluctuations in dust concentration during production, traditional and simple ventilation and dust removal methods are difficult to meet environmental protection and safety production requirements. Improper handling can easily lead to filter material clogging, system dust accumulation, or even dust explosion accidents.

[0003] Currently, the industry commonly uses cartridge dust collectors to treat resin production waste gas. However, existing equipment has significant drawbacks in actual operation: First, the ash discharge from the ash hopper relies on gravity flow, which easily leads to caking or bridging at the conical bottom for highly viscous resin dust, causing blockage of the ash discharge port and requiring frequent manual cleaning. Second, the inner cavity of conventional cartridges is mostly a smooth cylindrical or right-angled rectangular structure. During pulse jet cleaning, the airflow forms vortex dead zones in the four corners or bottom areas, resulting in incomplete dust removal. After long-term operation, the local resistance of the cartridge increases significantly, and the system energy consumption rises. Therefore, a waste gas treatment device suitable for resin production is proposed. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a waste gas treatment device suitable for resin production.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a waste gas treatment device suitable for resin production, comprising a collection and treatment unit, a dust removal and purification unit, and a centrifugal fan unit. The dust removal and purification unit is installed on one side of the collection and treatment unit, and the centrifugal fan unit is installed at the other end of the dust removal and purification unit. The dust removal and purification unit includes a clean air chamber and a filter cartridge assembly installed at the bottom of the clean air chamber. The bottom of the filter cartridge assembly is connected to the upper end face of the ash hopper assembly.

[0006] Preferably, the clean air chamber includes an air storage bag and a blow pipe installed horizontally on the outer end face of the air storage bag. An air outlet is opened at the edge of the bottom end face of the air storage bag, and a perforated plate is opened at the middle of the bottom of the air storage bag. The air reservoir forms a sealed pressure chamber that collects clean gas passing through the filter material and stabilizes the airflow pressure. Its internal volume can buffer the pressure fluctuations during pulse cleaning of the filter cartridge body, preventing instantaneous pressure shocks from being transmitted to the blowing equipment. When the shell is used directly as a compressed air reservoir, it can provide a large instantaneous flow of air to the blowpipe, reducing the need for independent air reservoirs and connecting pipelines.

[0007] The perforated plate is located at the bottom center of the air reservoir, supporting the upper opening of the filter cartridge and achieving strict isolation between the dust-laden side and the clean air side through a sealing gasket. The perforated plate corresponds one-to-one with the end caps to ensure uniform airflow into the clean air chamber; the central area arrangement ensures that the flow path length from each end cap to the air outlet is similar, resulting in uniform system resistance distribution and avoiding excessive load on local filter cartridges.

[0008] The blowpipe is installed horizontally on the outer end face of the air tank. It is controlled by a solenoid valve to instantly inject external compressed air into the inner cavity of the filter cartridge for dust removal. The external arrangement keeps the valve body in a clean environment, free from the corrosion of dust-containing hot air inside the housing, and facilitates daily inspection and maintenance. The installation method close to the air tank shell shortens the blowpipe, ensures that the pulse airflow pressure does not decrease, and improves the dust removal effect.

[0009] The air outlet is located at the bottom edge of the air storage tank, serving as a clean air exhaust channel and directly connected in series with the inlet pipe of the air inlet duct. The edge arrangement avoids the filter cartridge installation and maintenance space in the central area, facilitating pipe connection; the interface location forms a smooth airflow path with the air inlet duct of the blower body, reducing local eddy current losses and ensuring efficient delivery of treated gas to the blower system.

[0010] The gas continues to flow upward through the perforated plate, where it is processed within the gas storage tank. The installed blowpipes allow for gas exchange with the outside environment, and the outlets deliver the processed gas to the inlet pipes.

[0011] Preferably, the filter cartridge assembly includes a filter cartridge body and end caps that are attached to the upper and lower end faces of the filter cartridge body, and the surface of the end caps is provided with an array of vent holes; As the core unit of gas-solid separation, the filter cartridge assembly intercepts dust particles in the resin waste gas and provides an upward discharge channel for the filtered clean gas.

[0012] The vertical installation method matches the upward airflow direction, allowing the dust that falls off during pulse cleaning to fall directly into the dust hopper assembly under gravity, avoiding secondary entrainment; the modular structure supports individual replacement, and maintenance can be performed without stopping the machine.

[0013] The filter cartridge itself directly performs the filtration function, allowing gas to pass through the gaps in the filter material while trapping dust; its pleated structure increases the filtration area per unit volume, enabling it to handle large volumes of resin waste gas; the filter material surface is specially treated, such as with a membrane, to adapt to the sticky characteristics of resin dust, reducing the risk of bag clogging.

[0014] The end caps press against the upper and lower ports of the filter cartridge body; the end caps fit against the upper surface of the ash hopper assembly to form an air inlet channel, and the upper end caps fit against the tube sheet to form an air outlet channel, ensuring that the dust-laden gas must be filtered by the filter material before entering the inner cavity of the filter cartridge assembly, preventing airflow short circuit; the rigid end caps maintain the vertical shape of the filter cartridge, preventing it from swinging or deforming under the upward airflow of the blowing equipment.

[0015] Ventilation holes are located on the end cap surface. The lower hole allows dust-laden gas to enter the filter cartridge filtration area, while the upper hole allows clean gas to exit upwards. The number and position of the ventilation holes correspond one-to-one with the holes in the tube sheet, ensuring a uniform distribution of air intake for each filter cartridge and preventing individual cartridges from becoming clogged prematurely due to excessive load. The array arrangement ensures that the airflow is evenly distributed around the circumference of the filter cartridge, making full use of the filter media's filtration area and extending the filter cartridge's service life.

[0016] Dust-laden gas flows upward under the impetus of the air blowing device, enters the filter cartridge assembly through the vent at the lower end of the end cap, and after being filtered by the filter cartridge body, the clean gas rises through the central clean air chamber of the filter cartridge assembly, and finally enters the air outlet through the vent at the upper end. This structure achieves efficient interception of resin dust and smooth discharge of clean gas. The vertical channel, air storage tank, and blowpipe work together to form a continuous cycle of filtration-cleaning-dust settling, ensuring long-term stable operation of the device.

[0017] Preferably, the number of ventilation holes is the same as the number of perforated panels, and the ventilation holes are located at the same positions as the perforated panels. An alternative embodiment is proposed, in which the four corners of the rectangular inner cavity of the filter cartridge body are changed to rounded transitions or flow-guiding triangular plates are set at the four corners; during the cleaning process, the four corner areas of the right-angled rectangle are prone to forming vortex dead corners, which cause resin dust to accumulate and clump together at these areas. With the rounded corners, airflow along the wall is smoother, and the compressed air for cleaning can cover the entire inner surface of the filter media, avoiding uneven filtration resistance caused by localized dust accumulation. This structure is particularly suitable for handling resin dust containing abrasive fillers such as glass fibers, and can extend the filter cartridge's service life by more than 100%.

[0018] An alternative embodiment is proposed: the rectangular inner cavity of the filter cartridge body is designed to gradually change along the axial direction: firstly, it is a trapezoidal cross section that is wider in the vertical direction and narrower at the bottom, which utilizes the Venturi effect to enhance the bottom cleaning effect and solves the problem of dust being difficult to remove from the bottom of the rectangular filter cartridge; Secondly, the thickness gradually changes in the horizontal direction, forming a single-sided inclined channel, which makes the dust-laden airflow more evenly distributed along the length of the filter cartridge, avoiding the short-circuit phenomenon where the airflow concentrates at the upper opening in the traditional rectangular filter cartridge with equal cross-section.

[0019] Preferably, the ash hopper assembly includes a conical ash hopper installed at the bottom of the end cap, with an air inlet laterally opened at the edge of the conical ash hopper, and an air blowing device inserted through the bottom of the conical ash hopper; The ash hopper assembly serves as a transition chamber connecting the collection and processing unit and the filter cartridge assembly. It receives dust-laden exhaust gas from the inner cavity of the top cover, utilizes volume expansion to create an airflow buffer, reduces the inlet airflow velocity, and achieves gravity pre-dust removal. The filter cartridge assembly includes a lower support structure and a centralized dust collection space. When the gas enters the inner cavity of the ash hopper assembly through the air inlet, the flow rate drops sharply. Large resin dust particles fall directly to the bottom after impacting the conical ash hopper wall due to inertia, reducing the filtration load of the filter cartridge assembly and extending the filter media life. The conical cavity structure of the conical ash hopper ensures that the incoming dust-laden gas is evenly distributed to the bottom opening of each filter cartridge assembly, avoiding excessive local filtration load; The conical ash hopper is connected in series with the outer end wall of the collection and treatment unit to form a negative pressure exhaust system, ensuring that there is no organized leakage of exhaust gas in the inner cavity of the top cover, which meets the explosion-proof requirements for resin production. A conical ash hopper is installed at the bottom of the end cover to collect the dust that falls off the surface of the filter cartridge body during pulse cleaning; forming a conical collection space, the dust is guided by gravity to the bottom ash discharge port air blowing device; The air inlet is horizontally opened at the edge of the conical ash hopper, introducing the dust-laden exhaust gas from the inner cavity of the top cover into the ash hopper assembly, and using tangential air intake to generate a swirling effect.

[0020] The tangentially entering airflow forms a rotating flow field inside the conical ash hopper. The denser resin particles are thrown to the periphery by centrifugal force, collide with the wall, and enter the filtration zone with the rising airflow. Meanwhile, the fine particles are suspended in the central area and captured by the filter cartridge assembly, thus achieving particle size classification.

[0021] The horizontal opening at the edge of the air inlet facilitates direct connection with the side wall of the collection and treatment unit, reducing the need for elbow connections and lowering system resistance.

[0022] The air inlet is horizontally opened at the edge of the conical ash hopper, which introduces the dust-laden exhaust gas from the inner cavity of the top cover into the ash hopper assembly and uses tangential air intake to generate a swirling effect; The tangentially entering airflow forms a rotating flow field in the inner cavity of the conical ash hopper. The denser resin particles are thrown to the periphery under the action of centrifugal force, and after colliding with the wall, they enter the filtration zone with the rising airflow, while the fine particles are suspended in the central area and captured by the filter cartridge assembly, thus achieving particle size classification. The horizontal opening at the edge of the air inlet facilitates direct connection with the side wall of the collection and treatment unit, reducing the need for elbow connections and lowering system resistance.

[0023] The air blowing device is installed at the bottom of the conical ash hopper. The upward-spraying gas can be compressed air or recirculated purified gas, forming a forced airflow from bottom to top, which pushes the gas to be treated upward along the inner wall of the conical ash hopper through the filter cartridge assembly.

[0024] Resin dust is highly adhesive and prone to agglomeration. It is easy for it to accumulate and clump at the bottom of the cone if suction is carried out by negative pressure alone. The upward blowing of the air blowing equipment provides kinetic energy, keeping the dust in a suspended state and conveying it upward with the airflow, thus preventing bridging and blockage.

[0025] During the pulse cleaning intervals, a continuous micro-positive pressure airflow prevents the detached dust from re-adsorbing onto the filter cartridge surface, thus assisting the cleaning process. By controlling the air volume of the blowing equipment, the airflow speed inside the ash hopper assembly can be adjusted to avoid the deposition of combustible resin dust and reduce the risk of explosion. At the same time, the directional airflow from the top cover cavity to the ash hopper assembly is maintained to ensure no leakage.

[0026] Preferably, a centrifugal fan unit is inserted into the inner cavity of the air outlet. The centrifugal fan unit includes an air inlet pipe and a fan body installed at the other end of the air inlet pipe. An exhaust port is vertically opened at the top of the fan body, a base is installed at the bottom of the fan body, and a collection device is horizontally installed on the outer side of the fan body.

[0027] Preferably, the fan body includes a volute and a vent on the upper surface of the volute. A drive motor is laterally opened on the outer side of the volute. The drive motor transmits power to the impeller shaft through a transmission device. The other end of the impeller shaft is laterally inserted into the inner cavity of the volute. An impeller is installed at the other end of the impeller shaft. The impeller can rotate laterally in the inner cavity of the volute with the impeller shaft as the fulcrum. The volute forms a spiral flow channel with a gradually expanding cross-section, which receives the gas thrown out from the impeller. By utilizing the structural characteristics of the gradually increasing flow channel area, the kinetic energy gained by the gas is efficiently converted into static pressure energy, reducing outlet dynamic pressure loss and reducing system operating energy consumption.

[0028] The air inlet is located on the upper surface of the volute and connects to the air inlet pipe, guiding the airflow smoothly into the center of the impeller along the axial direction. Its circular guide structure reduces airflow turbulence and prevents pre-swirl of the airflow before entering the impeller, ensuring the impeller's working efficiency.

[0029] The drive motor is mounted laterally on the outside of the volute, providing rotational power to the system. The transmission device connects the motor shaft and the impeller shaft via a synchronous belt, achieving flexible power transmission. This structure allows for a certain degree of installation deviation, and the impeller speed can be adjusted by replacing pulleys of different diameters to adapt to the airflow requirements of different working conditions in resin production; belt slippage in case of overload protects the motor from damage.

[0030] The impeller shaft extends laterally through the sidewall of the volute casing and is supported and positioned by bearings, reliably transmitting the rotational motion of the belt to the impeller. The rigid shaft design ensures coaxiality during high-speed operation and reduces mechanical vibration.

[0031] The impeller is mounted on the shaft end and rotates at high speed inside the volute. The blades do work on the incoming gas, giving it radial velocity and pressure. Under the action of centrifugal force, the gas is thrown out from the outer edge of the impeller and into the volute flow channel. At the same time, a stable negative pressure is formed at the center of the impeller, continuously drawing in gas from the inlet pipe and the upstream outlet, providing the required air volume and pressure head for the entire waste gas treatment system, ensuring that a slightly negative pressure is maintained inside the reactor tank, and preventing the escape of organic vapors.

[0032] The gas entering the air inlet pipe through the air outlet is driven by the motor through the transmission device to drive the impeller shaft to rotate, thereby driving the impeller to rotate in the same direction in the inner cavity of the volute. The rotation of the impeller is used to process the gas. The processed gas is discharged from the device through the exhaust port, and the filtered impurities are taken out and collected into the inner cavity of the collection device for centralized processing.

[0033] The base includes a base frame and a central crossbeam installed in the middle of the base frame, with support legs installed laterally at both ends of the central crossbeam. The base frame can support the overall weight of the wind turbine body. The frame structure has high flatness and deformation resistance, which can evenly distribute the static load and dynamic load of the wind turbine body during operation and prevent local stress concentration. At the same time, it provides a reliable mechanical connection interface for the intermediate crossbeam and support legs, forming a stable support system.

[0034] The middle crossbeam is installed horizontally in the middle of the base frame, which effectively resists the overturning moment and torsional moment generated when the fan body is running, avoids the base frame from bending deformation under eccentric load, and reduces the phenomenon of uneven wear and belt skipping of the transmission device caused by base deformation.

[0035] The support legs are installed at both ends of the middle crossbeam, and the lateral support arrangement forms a stable force support point, which makes it easy to achieve precise leveling of the fan body by adjusting the height of each support; the vibration reduction design can absorb the unbalanced vibration generated by the high-speed rotation of the impeller, and significantly reduce the transmission of noise and vibration to the building structure.

[0036] Preferably, the other end of the air inlet is connected in series with the outer end wall of the collection and processing unit. The collection and processing unit includes a storage tank body and a top cover installed on the upper end face of the storage tank body. A feeding port is opened at the top position of the top cover, and a sealing cover is installed on the upper end face of the feeding port.

[0037] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This device addresses the characteristics of resin production waste gas: high viscosity, high dust concentration, and flammability and explosiveness. It forms a sealed collection space between the feed inlet cap and the storage tank body. Combined with the tangential air inlet structure of the ash hopper assembly, this creates a rotating flow field before the dust-laden waste gas enters the filtration zone, utilizing centrifugal force to achieve preliminary separation of coarse and fine particles. The blowing equipment at the bottom of the conical ash hopper continuously delivers air upwards, preventing resin dust from bridging on the conical bottom plate and ensuring even distribution of dust at the bottom of each filter cartridge through airflow lifting, avoiding excessive local load. Simultaneously, it maintains a slight negative pressure within the reactor, eliminating the risk of organic vapor escape.

[0038] 2. The filter cartridge assembly adopts a vertical installation method and works in conjunction with the pulse cleaning system. The dust removed during cleaning falls directly into the ash hopper under gravity, avoiding secondary entrainment. The pleated structure of the filter cartridge body increases the filtration area per unit volume. The one-to-one correspondence between the end caps and the tube sheet ensures uniform airflow distribution. The rounded corner transition or gradient cross-section design of the rectangular inner cavity eliminates cleaning dead corners and solves the problem of difficult dust removal from the bottom of traditional filter cartridges. Attached Figure Description

[0039] Figure 1 This is a three-dimensional structural diagram of a waste gas treatment device suitable for resin production proposed in this invention. Figure 2 This is a schematic diagram of a centrifugal fan unit structure for a waste gas treatment device suitable for resin production proposed in this invention. Figure 3 This is a schematic diagram of the base structure of a waste gas treatment device for resin production proposed in this invention. Figure 4 This is a schematic diagram of the fan body structure of a waste gas treatment device suitable for resin production proposed in this invention; Figure 5 This is a schematic diagram of a dust removal and purification unit structure for a waste gas treatment device suitable for resin production proposed in this invention. Figure 6 This is a schematic diagram of the clean air chamber and ash hopper assembly of a waste gas treatment device for resin production proposed in this invention. Figure 7 This is a schematic diagram of the filter cartridge assembly structure of a waste gas treatment device for resin production proposed in this invention; Figure 8 This is a schematic diagram of the clean air chamber structure of a waste gas treatment device for resin production proposed in this invention. Figure 9 This is a schematic diagram of the collection and treatment unit structure of a waste gas treatment device for resin production proposed in this invention.

[0040] In the diagram: 1. Collection and processing unit; 11. Tank body; 12. Top cover; 13. Feeding port; 14. Sealing cover; 2. Dust removal and purification unit; 21. Clean air chamber; 211. Air storage bag; 212. Blowpipe; 213. Air outlet; 214. Tube plate; 22. Filter cartridge assembly; 221. Filter cartridge body; 222. End cover; 223. Vent hole; 23. Ash hopper assembly; 231. Conical ash hopper; 232. Air inlet; 233. Air blowing equipment; 3. Centrifugal fan unit; 31. Air inlet pipe; 32. Fan body; 321. Volute; 322. Vent; 323. Drive motor; 324. Transmission device; 325. Impeller shaft; 326. Impeller; 33. Discharge port; 34. Base; 341. Base frame; 342. Intermediate crossbeam; 343. Support leg; 35. Collection device. Detailed Implementation

[0041] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0042] Reference Figures 1-9 Example 1: A waste gas treatment device suitable for resin production includes a collection and treatment unit 1, a dust removal and purification unit 2, and a centrifugal fan unit 3. The dust removal and purification unit 2 is installed on one side of the collection and treatment unit 1, and the centrifugal fan unit 3 is installed at the other end of the dust removal and purification unit 2. The dust removal and purification unit 2 includes a clean air chamber 21 and a filter cartridge assembly 22 installed at the bottom of the clean air chamber 21. The bottom of the filter cartridge assembly 22 is connected to the upper end face of the ash hopper assembly 23.

[0043] The clean air chamber 21 includes an air storage bag 211 and a blow pipe 212 horizontally installed on the outer end face of the air storage bag 211. An air outlet 213 is opened at the edge of the bottom end face of the air storage bag 211, and a perforated plate 214 is opened at the middle of the bottom of the air storage bag 211. The air reservoir 211 forms a sealed pressure-bearing cavity, collecting clean gas that passes through the filter material and stabilizing the airflow pressure. Its internal volume can buffer the pressure fluctuations during pulse cleaning of the filter cartridge body 221, preventing instantaneous pressure shocks from being transmitted to the blowing equipment 233; when the shell is used directly as a compressed air reservoir, it can provide a large instantaneous flow of air to the blow pipe 212, reducing the need for independent air reservoirs and connecting pipelines.

[0044] The perforated plate 214 is located at the bottom center of the air storage tank 211, supporting the upper opening of the filter cartridge body 221 and achieving strict isolation between the dust-laden side and the clean air side through a sealing gasket. The perforated plate 214 corresponds one-to-one with the end caps 222 to ensure that the airflow enters the clean air chamber evenly; the arrangement in the central area makes the flow path length from each end cap 222 to the air outlet 213 similar, resulting in a uniform distribution of system resistance and avoiding excessive load on local filter cartridges.

[0045] The blowpipe 212 is installed horizontally on the outer end face of the air tank 211. It controls the external compressed air to be injected into the inner cavity of the filter cartridge for dust removal through the control of the solenoid valve. The external arrangement keeps the valve body in a clean environment and is not corroded by the dust-containing hot air inside the box, which facilitates daily inspection and maintenance. The installation method close to the air tank shell shortens the blowpipe, ensures that the pulse airflow pressure does not decrease, and improves the dust removal effect.

[0046] The air outlet 213 is located at the bottom edge of the air storage tank 211, serving as a clean air exhaust channel and directly connected in series with the inlet pipe of the air inlet pipe 31. The edge arrangement avoids the filter cartridge installation and maintenance space in the central area, facilitating pipe connection; the interface position forms a smooth airflow path with the air inlet pipe 31 of the fan body 32, reducing local eddy current losses and ensuring efficient delivery of treated gas to the fan system.

[0047] The gas continues to flow upward through the tube sheet 214, and is processed in the inner cavity of the gas storage tank 211. The blow pipe 212 can exchange with the outside gas, and the air outlet 213 can deliver the processed gas to the air inlet pipe 31.

[0048] In Example 2, the filter cartridge assembly 22 includes a filter cartridge body 221 and end caps 222 attached to the upper and lower end faces of the filter cartridge body 221. Ventilation holes 223 are arrayed on the surface of the end caps 222. The filter cartridge assembly 22 serves as the core unit for gas-solid separation, intercepting dust particles in the resin waste gas and providing an upward discharge channel for the filtered clean gas.

[0049] The vertical installation method matches the upward airflow direction, so that the dust falling off during pulse cleaning falls directly into the dust hopper assembly 23 under the action of gravity, avoiding secondary entrainment; the modular structure supports individual replacement, and maintenance does not require stopping the machine.

[0050] The filter cartridge body 221 directly performs the filtration function, allowing gas to pass through the gaps in the filter material while trapping dust; its pleated structure increases the filtration area per unit volume, which can handle large volumes of resin exhaust gas; the filter material surface is specially treated, such as with a membrane, to adapt to the sticky characteristics of resin dust and reduce the risk of bag clogging.

[0051] The end cap 222 presses against the upper and lower ports of the filter cartridge body 221; the end cap 222 fits against the upper surface of the ash hopper assembly 23 to form an air inlet channel, and the upper end cap fits against the tube sheet 214 to form an air outlet channel, ensuring that the dust-laden gas must be filtered by the filter material before entering the inner cavity of the filter cartridge assembly 22, preventing airflow short circuit; the rigid end cap maintains the vertical shape of the filter cartridge, preventing it from swinging or deforming under the upward airflow of the blowing device 233.

[0052] Vent holes 223 are opened on the surface of end cap 222. The lower hole allows dust-laden gas to enter the filter cartridge filtration area, and the upper hole allows clean gas to be discharged upwards. The number and position of vent holes 223 correspond one-to-one with the holes in the tube sheet 214, ensuring that the air intake of each filter cartridge is evenly distributed and preventing individual filter cartridges from becoming clogged prematurely due to excessive load. The array arrangement makes the airflow evenly distributed in the circumferential direction of the filter cartridge, making full use of the filtration area of ​​the filter material and extending the service life of the filter cartridge.

[0053] Dust-laden gas flows upward under the push of the air blowing device 233, enters the filter cartridge assembly 22 through the vent 223 at the lower end of the end cover 222, and after passing through the filter cartridge body 221 for filtration, the clean gas flows upward through the central clean air chamber of the filter cartridge in the inner cavity of the filter cartridge assembly 22, and finally enters the air outlet 213 through the upper vent 223. This structure achieves efficient interception of resin dust and smooth discharge of clean gas. The vertical channel, air storage tank 211, and blowpipe 212 work together to form a continuous cycle of filtration-cleaning-dust settling, ensuring long-term stable operation of the device.

[0054] In Example 3, the number of ventilation holes 223 is the same as the number of openings in the perforated plate 214, and the opening positions of the ventilation holes 223 and the perforated plate 214 are the same. Example 4 proposes an alternative embodiment, in which the four corners of the rectangular inner cavity of the filter cartridge body 221 are changed to rounded transitions or flow-guiding triangular plates are set at the four corners; during dust removal, the four corner areas of the right-angled rectangle are prone to forming vortex dead angles, causing resin dust to accumulate and clump together at these locations. With the rounded corners, airflow along the wall is smoother, and the compressed air for cleaning can cover the entire inner surface of the filter media, avoiding uneven filtration resistance caused by localized dust accumulation. This structure is particularly suitable for handling resin dust containing abrasive fillers such as glass fibers, and can extend the filter cartridge's service life by more than 20%.

[0055] Example 5 proposes an alternative embodiment: the rectangular inner cavity of the filter cartridge body 221 is designed to gradually change along the axial direction: firstly, it is a trapezoidal cross-section that is wider in the vertical direction and narrower at the bottom, which utilizes the Venturi effect to enhance the bottom cleaning effect and solves the problem of dust being difficult to remove from the bottom of the rectangular filter cartridge; Secondly, the thickness gradually changes in the horizontal direction, forming a single-sided inclined channel, which makes the dust-laden airflow more evenly distributed along the length of the filter cartridge, avoiding the short-circuit phenomenon where the airflow concentrates at the upper opening in the traditional rectangular filter cartridge with equal cross-section.

[0056] Example 6: The ash hopper assembly 23 includes a conical ash hopper 231 installed at the bottom of the end cap 222. An air inlet 232 is laterally opened at the edge of the conical ash hopper 231, and an air blowing device 233 is inserted at the bottom of the conical ash hopper 231. The ash hopper assembly 23 serves as a transition chamber connecting the collection and processing unit 1 and the filter cartridge assembly 22. It receives dust-laden exhaust gas from the inner cavity of the top cover 12, utilizes volume expansion to create an airflow buffer, reduces the inlet airflow velocity, and achieves gravity pre-dust removal. The filter cartridge assembly 22 also includes a lower support structure and a concentrated dust collection space. When the gas enters the inner cavity of the ash hopper assembly 23 through the air inlet 232, the flow rate drops sharply. Large resin dust particles fall directly to the bottom after impacting the wall of the conical ash hopper 231 due to inertia, which reduces the filtration load of the filter cartridge assembly 22 and extends the filter material life. The conical cavity structure of the conical ash hopper 231 ensures that the incoming dust-laden gas is evenly distributed to the bottom opening of each filter cartridge assembly 22, thus avoiding excessive local filtration load. The conical ash hopper 231 is connected in series with the outer end wall of the collection and treatment unit 1 to form a negative pressure exhaust system, ensuring that the exhaust gas in the inner cavity of the top cover 12 does not leak from the organization and meets the explosion-proof requirements for resin production. A conical ash hopper 231 is installed at the bottom of the end cover 222 to collect the dust that falls off the surface of the filter cartridge body 221 during pulse cleaning; forming a conical collection space, and using gravity to guide the dust to the bottom ash discharge port blowing device 233. The air inlet 232 is horizontally opened at the edge of the conical ash hopper 231, introducing the dust-laden exhaust gas in the inner cavity of the top cover 12 into the ash hopper assembly 23, and generating a swirling effect by utilizing tangential air intake.

[0057] The tangentially entering airflow forms a rotating flow field in the inner cavity of the conical ash hopper 231. The denser resin particles are thrown to the periphery under the action of centrifugal force, and after colliding with the wall, they enter the filtration zone with the rising airflow, while the fine particles are suspended in the central area and captured by the filter cartridge assembly 22, thus achieving particle size classification.

[0058] The air inlet 232 is horizontally opened at the edge to facilitate direct docking with the side wall of the collection and treatment unit 1, reducing the need for elbow connections and lowering system resistance.

[0059] The air inlet 232 is opened laterally at the edge of the conical ash hopper 231, introducing the dust-laden exhaust gas inside the top cover 12 into the ash hopper assembly 23, and generating a swirling effect by utilizing tangential air intake; The tangentially entering airflow forms a rotating flow field in the inner cavity of the conical ash hopper 231. The denser resin particles are thrown to the periphery under the action of centrifugal force, and after colliding with the wall, they enter the filtration zone with the rising airflow, while the fine particles are suspended in the central area and captured by the filter cartridge assembly 22, thus achieving particle size classification. The air inlet 232 is horizontally opened at the edge to facilitate direct docking with the side wall of the collection and treatment unit 1, reducing the need for elbow connections and lowering system resistance.

[0060] The air blowing device 233 is installed at the bottom of the conical ash hopper 231. The upward-spraying gas can be compressed air or circulating purified gas, forming a forced airflow from bottom to top, which pushes the gas to be treated upward along the inner wall of the conical ash hopper 231 through the filter cartridge assembly 22.

[0061] Resin dust is highly adhesive and easily agglomerates. It is easy for it to accumulate and clump at the bottom of the cone by relying solely on negative pressure suction. The upward blowing of the air blowing device 233 provides kinetic energy, keeping the dust in a suspended state and conveying it upward with the airflow, preventing bridging and blockage.

[0062] During the pulse cleaning intervals, the continuous micro-positive pressure airflow prevents the detached dust from being re-adsorbed onto the filter cartridge surface, thus assisting the cleaning process. By controlling the air volume of the blowing device 233, the airflow speed inside the ash hopper assembly 23 can be adjusted to avoid the deposition of combustible resin dust and reduce the risk of explosion. At the same time, the directional airflow from the inner cavity of the top cover 12 to the ash hopper assembly 23 is maintained to ensure no leakage.

[0063] In Example 7, a centrifugal fan unit 3 is inserted into the inner cavity of the air outlet 213. The centrifugal fan unit 3 includes an air inlet pipe 31 and a fan body 32 installed at the other end of the air inlet pipe 31. An exhaust port 33 is vertically opened at the top of the fan body 32, a base 34 is installed at the bottom of the fan body 32, and a collection device 35 is horizontally installed on the outer side of the fan body 32.

[0064] The fan body 32 includes a volute 321 and a vent 322 opened on the upper end face of the volute 321. A drive motor 323 is opened laterally on the outside of the volute 321. The drive motor 323 transmits power to the impeller shaft 325 through a transmission device 324. The other end of the impeller shaft 325 is inserted laterally into the inner cavity of the volute 321. An impeller 326 is installed at the other end of the impeller shaft 325. The impeller 326 can rotate laterally in the inner cavity of the volute 321 with the impeller shaft 325 as the fulcrum. The volute 321 forms a spiral flow channel with a gradually expanding cross section, which receives the gas thrown out from the impeller 326. By utilizing the structural characteristics of the gradually increasing flow channel area, the kinetic energy gained by the gas is efficiently converted into static pressure energy, reducing outlet dynamic pressure loss and reducing system operating energy consumption.

[0065] The air inlet 322 is located on the upper surface of the volute 321 and connects with the air inlet pipe 31, guiding the airflow smoothly into the center of the impeller along the axial direction. Its circular guide structure reduces the intake vortex and prevents the airflow from pre-swirling before entering the impeller, ensuring the impeller's working efficiency.

[0066] The drive motor 323 is mounted laterally on the outside of the volute 321, providing rotational power to the system. The transmission device 324 connects the motor shaft and the impeller shaft via a synchronous belt, achieving flexible power transmission. This structure allows for a certain installation deviation, and the impeller speed can be adjusted by replacing pulleys of different diameters to adapt to the airflow requirements of different working conditions in resin production; belt slippage in case of overload protects the motor from damage.

[0067] The impeller shaft 325 extends laterally through the side wall of the volute 321 and is supported and positioned by the bearing 235, reliably transmitting the rotational motion of the belt to the impeller. The rigid shaft design ensures coaxiality during high-speed operation and reduces mechanical vibration.

[0068] Impeller 326 is mounted on the shaft end and rotates at high speed inside the volute 321. The blades do work on the incoming gas, giving it radial velocity and pressure. Under the action of centrifugal force, the gas is thrown out from the outer edge of the impeller and enters the volute flow channel. At the same time, a stable negative pressure is formed at the center of the impeller, continuously drawing in the gas from the inlet pipe 31 and the upstream outlet 213, providing the required air volume and pressure head for the entire waste gas treatment system, ensuring that the reactor storage tank body 11 maintains a slightly negative pressure state, and preventing organic vapors from escaping.

[0069] In summary: the gas entering the air inlet pipe 31 through the air outlet 213 is driven by the motor 323 through the transmission device 324 to drive the impeller shaft 325 to rotate, thereby driving the impeller 326 to rotate in the same direction in the inner cavity of the volute 321. The rotation of the impeller 326 is used to process the gas. The processed gas is discharged from the device through the exhaust port 33. The filtered impurities are taken out and collected into the inner cavity of the collection device 35 for centralized processing.

[0070] Example 8: The base 34 includes a base frame 341 and a middle crossbeam 342 installed in the middle of the base frame 341. The two ends of the middle crossbeam 342 are laterally supported by support legs 343. The base frame 341 can bear the overall weight of the fan body 32. The frame structure has high flatness and deformation resistance, which can evenly distribute the static load and dynamic load during operation of the fan body 32 and prevent local stress concentration. At the same time, it provides a reliable mechanical connection interface for the intermediate crossbeam 342 and the support leg 343, forming a stable support system.

[0071] The intermediate crossbeam 342 is installed horizontally in the middle of the base frame 341, which effectively resists the overturning moment and torsional moment generated when the fan body 32 is running, avoids the base frame 341 from flexing and deforming under eccentric load, and reduces the phenomenon of uneven wear and belt skipping of the transmission device 324 caused by the deformation of the base.

[0072] Support legs 343 are installed at both ends of the middle crossbeam 342. The transverse support arrangement forms a stable force fulcrum, which makes it easy to achieve precise horizontal alignment of the fan body 32 by adjusting the height of each support. The vibration reduction design can absorb the unbalanced vibration generated by the high-speed rotation of the impeller 326, and significantly reduce the transmission of noise and vibration to the building structure.

[0073] The other end of the air inlet 232 is connected in series with the outer end wall of the collection and processing unit 1. The collection and processing unit 1 includes a storage tank body 11 and a top cover 12 installed on the upper end face of the storage tank body 11. A feeding port 13 is opened at the top position of the top cover 12, and a sealing cover 14 is installed on the upper end face of the feeding port 13.

Claims

1. A waste gas treatment device suitable for resin production, comprising a collection and treatment unit (1), a dust removal and purification unit (2), and a centrifugal fan unit (3), characterized in that, A dust removal and purification unit (2) is installed on one side of the collection and processing unit (1), and a centrifugal fan unit (3) is installed at the other end of the dust removal and purification unit (2). The dust removal and purification unit (2) includes a clean air chamber (21) and a filter cartridge assembly (22) installed at the bottom of the clean air chamber (21). The bottom of the filter cartridge assembly (22) is connected to the upper end face of the ash hopper assembly (23).

2. The waste gas treatment device suitable for resin production according to claim 1, characterized in that, The clean air chamber (21) includes an air storage bag (211) and a blow pipe (212) installed horizontally on the outer end face of the air storage bag (211). An air outlet (213) is opened at the edge of the bottom end face of the air storage bag (211), and a perforated plate (214) is opened at the middle of the bottom of the air storage bag (211).

3. The waste gas treatment device for resin production according to claim 1, characterized in that, The filter cartridge assembly (22) includes a filter cartridge body (221) and end caps (222) attached to the upper and lower end faces of the filter cartridge body (221). Ventilation holes (223) are arrayed on the surface of the end caps (222).

4. The waste gas treatment device for resin production according to claim 3, characterized in that, The number of ventilation holes (223) is the same as the number of openings in the flower plate (214), and the ventilation holes (223) and the flower plate (214) are in the same position.

5. The waste gas treatment device suitable for resin production according to claim 1, characterized in that, The ash hopper assembly (23) includes a conical ash hopper (231) installed at the bottom of the end cap (222), with an air inlet (232) laterally opened at the edge of the conical ash hopper (231), and an air blowing device (233) inserted through the bottom of the conical ash hopper (231).

6. A waste gas treatment device suitable for resin production according to claim 2, characterized in that, Centrifugal fan unit (3) is inserted into the inner cavity of the air outlet (213). The centrifugal fan unit (3) includes an air inlet pipe (31) and a fan body (32) installed at the other end of the air inlet pipe (31). The top of the fan body (32) has a vertically opened discharge port (33). The bottom of the fan body (32) is equipped with a base (34). The outer side of the fan body (32) is horizontally equipped with a collection device (35).

7. A waste gas treatment device suitable for resin production according to claim 6, characterized in that, The fan body (32) includes a volute (321) and a vent (322) on the upper surface of the volute (321). A drive motor (323) is laterally opened on the outer side of the volute (321). The drive motor (323) transmits power to the impeller shaft (325) through a transmission device (324). The other end of the impeller shaft (325) is laterally inserted into the inner cavity of the volute (321). An impeller (326) is installed at the other end of the impeller shaft (325). The impeller (326) can rotate laterally in the inner cavity of the volute (321) with the impeller shaft (325) as the fulcrum.

8. A waste gas treatment device suitable for resin production according to claim 6, characterized in that, The base (34) includes a base frame (341) and a middle crossbeam (342) installed in the middle of the base frame (341). The two ends of the middle crossbeam (342) are laterally supported by support legs (343).

9. A waste gas treatment device suitable for resin production according to claim 5, characterized in that, The other end of the air inlet (232) is connected in series with the outer end wall of the collection and processing unit (1). The collection and processing unit (1) includes a tank body (11) and a top cover (12) installed on the upper end face of the tank body (11). A feeding port (13) is opened at the top position of the top cover (12), and a sealing cover (14) is installed on the upper end face of the feeding port (13).

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