A spray condensable exhaust gas anti-gelation and plugging spray cleaning device and method

Abstract

The present application relates to the technical field of industrial volatile organic waste gas treatment equipment, and particularly relates to a spraying condensable waste gas anti-gluing and blocking spray purification equipment and method. Comprising: a cyclone spray tower, used for conveying treated waste gas into an integrated circulating sedimentation tank; the integrated circulating sedimentation tank is installed at the bottom of the cyclone spray tower, used for three-stage partitioned waste liquid separation of the gas conveyed by the cyclone spray tower; an intelligent automatic control assembly, used for internal regulation and control of the integrated circulating sedimentation tank. The present application adopts large-diameter wide-flow-channel spraying, baffling and steady-flow stratified sedimentation, independent scum collection, impeller-free gas lifting and mud discharge, and differential pressure liquid level linkage automatic control structure, avoids gluing blockage from the root of the structure, realizes three-phase stratified separation of light scum, suspended floc and heavy glue, can be continuously operated for 24 hours without manual attendance, greatly reduces cleaning frequency and hazardous waste production, is convenient to transform, and has outstanding engineering practical value and structural creativity.

Description

Technical Field

[0001] This invention relates to the field of industrial volatile organic waste gas treatment equipment, and in particular to a spray purification device and method for preventing the condensable waste gas from forming gum and clogging. Background Technology

[0002] During powder coating curing, the high-temperature exhaust gas from the curing oven contains a large amount of low-temperature condensable organic components generated from resin pyrolysis and additive decomposition. These organic components remain stable in a gaseous state at high temperatures but readily liquefy during pipeline transport and equipment cooling, forming a highly adhesive, oily, viscous substance. Conventional industry treatment equipment generally uses ordinary water spraying, which has an inherent incompatibility with this process.

[0003] 1. Clear water has a weak ability to dissolve organic components that can be condensed at high temperatures. A large amount of organic matter cannot be captured by the water. After cooling, it continues to precipitate viscous colloids, which adhere to the tower wall, spray pipes, water surface and bottom of the pool. The clumps are stubborn and extremely difficult to clean.

[0004] 2. Traditional spraying equipment uses a micro-orifice nozzle structure, and even a small amount of adhesive can cause nozzle blockage and spraying failure, resulting in a high equipment failure rate;

[0005] 3. Traditional circulating water tanks have a flat bottom structure and no stable flow stratification structure. Colloidal flocs are suspended and disordered, and cannot be effectively settled and separated. They are continuously returned to the tower with the circulating water, and repeatedly gel and accumulate.

[0006] 4. Traditional equipment lacks a dedicated scum separation structure, making it impossible to directionally remove light, oily scum from the liquid surface, which accumulates and deteriorates over time, causing secondary pollution to the equipment.

[0007] 5. Traditional impeller-type sludge discharge structures are easily jammed by entangled viscous colloids, causing long-term accumulation and hardening of sludge at the bottom of the pool, requiring frequent shutdowns for manual sludge removal.

[0008] 6. The intelligent prediction structure prevents colloid accumulation and blockage without warning, which seriously affects the continuous operation of the spraying production line.

[0009] Currently, specialized high-temperature absorbents have become a mature pretreatment technology, effectively dissolving and capturing high-temperature condensable organic components, solving the problem of difficult removal of gaseous organic matter. However, existing traditional spray equipment has an outdated structure and is not adapted to the circulation conditions of absorbent liquid containing colloids. Even with the use of specialized absorbents, the large amount of suspended colloids, scum, and sludge generated by the aerosol cannot be effectively treated, and the industry pain points of equipment clogging, wall adhesion, caking, and difficulty in cleaning still exist. Therefore, for the special waste liquid conditions after condensable organic waste aerosols, there is an urgent need for a specialized purification device with a specially optimized structure that can prevent caking, clogging, stratified colloid removal, and eliminate the need for frequent manual cleaning. Summary of the Invention

[0010] Based on this, it is necessary to provide a spray purification device and method for preventing the condensable waste gas from forming adhesive and clogging, in order to solve the technical problems of existing traditional spray equipment, which has an outdated structure, cannot adapt to the waste liquid conditions after spraying condensable organic waste aerosol, and is prone to forming adhesive, clogging, hardening, and difficult cleaning of the adhesive residue on the wall, as well as cumbersome operation and maintenance.

[0011] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0012] A spray purification device for preventing the condensation and clogging of exhaust gas includes:

[0013] A cyclone spray tower is used to treat waste gas and then transport it to an integrated circulating sedimentation tank.

[0014] An integrated circulating sedimentation tank is installed at the bottom of the cyclone spray tower and is used to separate the gas transported by the cyclone spray tower into three sections for waste liquid separation.

[0015] Intelligent self-control components are used for internal regulation of the integrated circulating sedimentation tank.

[0016] Preferably, the cyclone spray tower comprises:

[0017] The main body of the cyclone spray tower is used to allow the waste gas and the absorbent liquid to come into contact and react inside; cyclone spray components are evenly distributed inside the main body of the cyclone spray tower.

[0018] The spray circulation inlet main pipe is located on one side of the cyclone spray tower body and is used to transport the adhesive-containing absorbent liquid to the cyclone spray components.

[0019] The high-temperature exhaust gas inlet pipe is located at the bottom of one side of the main body of the cyclone spray tower;

[0020] The anti-sticking guide slope at the bottom of the tower is inclinedly set at the bottom of the cyclone spray tower body.

[0021] Preferably, a full-length scum collection weir is provided at the top of the integrated circulating sedimentation tank, and an electric scum discharge valve is fixed at one end of the integrated circulating sedimentation tank and at the top of the full-length scum collection weir. The output end of the electric scum discharge valve is connected to a scum discharge channel.

[0022] Preferably, the top of the integrated circulating sedimentation tank is fixed with a bottom outlet channel, and the bottom of the integrated circulating sedimentation tank is fixed with a tank support steel structure for supporting the weight of the integrated circulating sedimentation tank.

[0023] Preferably, the integrated circulating sedimentation tank includes:

[0024] The baffle-type gradient buffer water distribution zone is located at one end inside the integrated circulating sedimentation tank and is used to receive the high-colloidal waste liquid discharged from the main body of the cyclone spray tower.

[0025] The inclined plate sedimentation zone is located at one end of the baffle gradient buffer water distribution zone inside the integrated circulating sedimentation tank, and is used for gravity sedimentation of heavy colloidal sludge.

[0026] The clear water circulation zone is separated from the inclined plate sedimentation zone inside the integrated circulating sedimentation tank by a vertical overflow baffle, which is located away from the baffle gradient buffer water distribution zone.

[0027] A clean water circulation outlet is located at the bottom of the clean water circulation zone. The output end of the clean water circulation outlet is connected to a circulation pump, and the output end of the circulation pump is connected to a spray circulation liquid outlet main pipe.

[0028] Preferably, the baffle-type gradient buffer water distribution zone has staggered high and low layered baffles inside, and the inclined plate sedimentation zone has modular snap-on inclined plates inside.

[0029] Preferably, the bottom of the inclined plate sedimentation zone forms a conical sludge collection hopper through a bidirectional conical sludge collection slope, which is used to collect heavy colloidal sludge that settles by its own weight. The bottom of the conical sludge collection hopper is equipped with an impellerless airlift sludge discharge pipeline for stable discharge of heavy colloidal sludge.

[0030] Preferably, the intelligent self-control component includes:

[0031] The PLC automatic control cabinet is located on the outside of the integrated circulating sedimentation tank. It is used to receive signals from the liquid level sensor and differential pressure sensor and output linkage control commands.

[0032] Differential pressure linkage automatic control unit is used to detect differential pressure inside the pipeline;

[0033] The liquid level interlock control unit is used to detect the liquid level inside the inclined plate sedimentation zone and the clear water circulation zone.

[0034] Preferably, the differential pressure linkage automatic control unit includes a differential pressure sensor, which is installed between the circulating pump and the spray circulating liquid outlet main pipe;

[0035] The liquid level interlock control unit includes a liquid level sensor, which is installed on the inner side of the inclined plate sedimentation zone and the clear water circulation zone, respectively.

[0036] A spray purification method for preventing the condensable waste gas from forming adhesive residue and clogging includes the following steps:

[0037] S1: The high-temperature exhaust gas from the curing process of the spraying production line is directly sent into the main body of the cyclone spray tower through the high-temperature exhaust gas inlet pipe. The high-temperature absorbent is transported to the cyclone spray component through the spray circulation liquid inlet pipe to complete the dissolution of gaseous organic matter. The purified exhaust gas is discharged from the purified exhaust gas outlet at the top of the tower.

[0038] S2: The high-colloidal waste liquid after sol-gelling quickly gathers along the anti-sticking guide slope at the bottom of the tower, and flows by gravity into the baffle gradient buffer distribution area of ​​the integrated circulating sedimentation tank through the liquid outlet connection channel at the bottom of the tower. After being stabilized and slowed down by the baffle plate and inhibiting the flocs from floating, it enters the inclined plate sedimentation area evenly.

[0039] S3: Light oily colloidal scum suspended on the liquid surface is intercepted separately by a full-length scum collection weir, and discharged independently by an electric scum discharge valve and a scum discharge channel; Heavy colloidal sludge in the waste liquid slides down along a modular snap-on inclined plate under gravity to a conical sludge collection hopper for collection, and is automatically discharged periodically through an impeller-free air-lift sludge discharge pipeline.

[0040] S4: The clarified absorbent liquid, after thoroughly removing colloidal scum and colloidal sludge, passes through the upper overflow port of the vertical overflow baffle and enters the clear water circulation zone. It then flows into the circulation pump for pressurization through the clear water circulation outlet and returns to the main body of the cyclone spray tower through the spray circulation outlet main pipe, thus realizing the closed-loop circulation of the absorbent liquid.

[0041] S5: In steps S1-S4, the liquid level sensor and differential pressure sensor monitor the colloidal siltation condition of the pipeline and water tank in real time. The signal is transmitted to the PLC automatic control cabinet to automatically execute tower flushing, slag discharge, water replenishment and sewage discharge operations.

[0042] It is clear without a doubt that the technical problems to be solved by the present invention can be solved by the above-described technical solutions of the present invention.

[0043] Meanwhile, through the above technical solutions, the present invention has at least the following beneficial effects:

[0044] 1. The present invention provides a spray purification device and method for preventing the condensable waste gas from forming adhesive and clogging. It relies on the structural innovation of pure mechanical equipment and is adapted to the existing mature special absorbent treatment system. It solves the technical problem that water washing equipment and traditional spray equipment cannot treat colloidal waste liquid, and realizes the long-term stable and cleaning-free continuous operation of the equipment.

[0045] 2. This invention abandons the traditional micro-orifice nozzle that is prone to clogging and adopts a large-diameter, non-clogging swirl spray assembly with a diameter of ≥20mm. It is specially adapted to the circulating working conditions of adhesive absorbent liquid, and is not afraid of the adhesion of trace amounts of colloid. The spray system is unobstructed and unclogging for a long time.

[0046] 3. This invention achieves thorough stratification and separation of light floating scum, suspended flocs, and heavy sludge through a three-section structure: a top full-length scum collection weir to intercept floating sludge, a middle baffle plate to stabilize the flow and prevent floating, and a bottom conical sludge collection hopper with an air-lift sludge discharge pipeline. This prevents sludge from adhering to the walls, accumulating, and flowing back, eliminating the need for frequent manual cleaning of the equipment. Furthermore, addressing the characteristics of viscous sludge being prone to entanglement and jamming of mechanical structures, the impeller drive structure is eliminated, and a pure air pressure driven air-lift sludge discharge pipeline is adopted, eliminating the risk of moving parts getting stuck. The conical sludge collection hopper has no dead corners and no sludge caking.

[0047] 4. This invention forms a dedicated buffer channel through the baffles in the gradient buffer water distribution zone, which stabilizes the flow of high-colloid waste liquid, inhibits the floating of settled colloidal flocs, and avoids secondary wall blockage caused by continuous colloid backflow into the swirl spray tower body.

[0048] 5. This invention uses a differential pressure sensor to monitor the differential pressure of the spray circulation outlet main pipeline in real time, accurately identify the adhesion trend of trace colloids, and the PLC automatic control cabinet automatically flushes and discharges slag in advance, eliminating the need for manual maintenance and making it fully compatible with 24-hour continuous operation of the spraying production line.

[0049] 6. This invention does not require any changes to the front-end waste gas collection and absorbent spraying process. It can be adapted to the sol waste liquid working conditions simply by upgrading the structure of this equipment. The amount of modification work is small, the implementation cost is low, and the compatibility is extremely strong. Attached Figure Description

[0050] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0051] Figure 1 This is a schematic diagram of the internal cross-sectional structure of the cyclone spray tower of the present invention;

[0052] Figure 2 This is a schematic diagram of the longitudinal cross-sectional structure of the circulating sedimentation tank of the present invention.

[0053] In the diagram: 1. Purified exhaust gas outlet; 2. Main body of the cyclone spray tower; 3. Main inlet pipe for spray circulation; 4. Cyclone spray assembly; 5. High-temperature exhaust gas inlet pipe; 6. Anti-sticking guide slope at the bottom of the tower; 7. PLC automatic control cabinet; 8. Outlet connection channel at the bottom of the tower; 9. Integrated circulating sedimentation tank; 10. Baffle-type gradient buffer water distribution area; 11. Full-length scum collection weir; 12. Baffle plate; 13. Liquid level sensor; 14. Inclined plate sedimentation area; 15. Modular snap-on inclined plate; 16. Clear water circulation area; 17. Electric scum discharge valve; 18. Vertical overflow baffle; 19. Conical sludge collection hopper; 20. Air-lift sludge discharge pipeline; 21. Steel structure supporting the tank; 22. Scum discharge channel; 23. Clear water circulation outlet; 24. Circulation pump; 25. Differential pressure sensor; 26. Main outlet pipe for spray circulation. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0055] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0056] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0057] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0058] Example 1

[0059] Reference Figures 1-2 A spray purification device for preventing the condensation and clogging of exhaust gas, comprising:

[0060] refer to Figure 1 The cyclone spray tower is used to treat waste gas and then transport it to the integrated circulating sedimentation tank 9.

[0061] The cyclone spray tower includes:

[0062] The main body 2 of the cyclone spray tower is used to allow the waste gas and the absorbent liquid to come into contact and react inside. The cyclone spray components 4 are evenly distributed inside the main body 2 of the cyclone spray tower. By setting multiple cyclone spray components 4, the waste gas is sprayed and washed, which is adapted to the high-flow circulation spray operation of the absorbent liquid containing adhesive, and avoids the risk of adhesive adhesion and blockage. It is specifically adapted to the high-flow circulation spray of the absorbent liquid containing adhesive, and avoids the risk of adhesive adhesion and blockage from the structural source.

[0063] Preferably, the swirl spray assembly 4 is a large-diameter, non-clogging swirl spray device. The swirl spray assembly 4 includes multiple parallel-arranged wide-channel swirl water distribution pipes, with a single water distribution pipe diameter ≥20mm. It eliminates the traditional easily clogged microporous atomizing nozzle structure, and the water distribution pipe wall is opened with swirl-type diversion openings to adapt to continuous circulation spraying of high-adhesive absorbent liquid, effectively avoiding pipe blockage caused by the adhesion and accumulation of trace amounts of adhesive.

[0064] Preferably, the top of the cyclone spray tower body 2 is provided with a purified exhaust gas outlet 1 for discharging the clean exhaust gas after washing and purification upwards.

[0065] The spray circulation inlet main pipe 3 is located on one side of the cyclone spray tower body 2 and is used to transport the adhesive-containing absorbent liquid to the cyclone spray assembly 4.

[0066] The high-temperature exhaust gas inlet pipe 5 is located at the bottom of one side of the cyclone spray tower body 2, so that the cyclone spray tower body 2 can be directly connected to the spraying high-temperature exhaust gas containing condensable organic matter through the high-temperature exhaust gas inlet pipe 5 without a pre-cooling structure.

[0067] The anti-sticking guide slope 6 at the bottom of the tower is inclinedly set at the bottom of the cyclone spray tower body 2. The adhesive waste liquid is guided to flow out by gravity through the inclined slope of the anti-sticking guide slope 6, preventing the colloid from sticking to the wall and thus avoiding the accumulation of colloid in dead corners. At the same time, the adhesive waste liquid guided out through the anti-sticking guide slope 6 is connected to the integrated circulating sedimentation tank 9 through the bottom liquid outlet connecting channel 8, so that the waste liquid at the bottom of the tower is sent into the integrated circulating sedimentation tank 9 through the bottom liquid outlet connecting channel 8.

[0068] refer to Figure 2 An integrated circulating sedimentation tank 9 is installed at the bottom of the cyclone spray tower and is used to separate the gas transported by the cyclone spray tower into three sections for waste liquid separation.

[0069] Preferably, the top of the integrated circulating sedimentation tank 9 is fixed with a bottom outlet channel 8, which allows the high-colloidal waste liquid discharged by the cyclone spray tower body 2 through the bottom anti-sticking guide slope 6 to enter the interior of the integrated circulating sedimentation tank 9 through the bottom outlet channel 8.

[0070] Preferably, the bottom of the integrated circulating sedimentation tank 9 is fixed with a tank support steel structure 21 for supporting the weight of the integrated circulating sedimentation tank 9. A full-length scum collection weir 11 is installed at the top inside the integrated circulating sedimentation tank 9, specifically arranged along the full width of the tank and embedded 3-5mm below the liquid surface, for separately trapping light, viscous scum suspended on the liquid surface after the absorbent sol; a [missing information - likely a type of structure] is fixed at one end inside the integrated circulating sedimentation tank 9 and at the top of the full-length scum collection weir 11. The electric scum discharge valve 17 is used to discharge the retained light colloidal scum after opening. The output end of the electric scum discharge valve 17 is connected to the scum discharge channel 22, which is used to transport the retained light colloidal scum discharged by the electric scum discharge valve 17 to the hazardous waste collection container. Thus, through the cooperation of the electric scum discharge valve 17 and the scum discharge channel 22, the light oily scum generated by the absorbent sol is retained and discharged separately and in a separate direction throughout the process, preventing the scum from flowing back into the scrubbing tower and causing secondary wall blockage.

[0071] The integrated circulating sedimentation tank 9 includes:

[0072] The baffle-type gradient buffer water distribution zone 10 is located at one end inside the integrated circulating sedimentation tank 9. It is used to receive the high-colloidal waste liquid discharged from the main body 2 of the swirl spray tower and realize the stable flow state of the high-colloidal waste liquid through the liquid outlet connection channel 8 at the bottom of the tower.

[0073] Preferably, the baffle-type gradient buffer water distribution zone 10 is staggered with baffles 12 of varying heights, and a progressively decelerating and meandering flow channel is formed between two adjacent baffles 12 to stabilize the flow of high-colloidal waste liquid, reduce the turbulence of the waste liquid, and completely prevent the settled colloidal flocs from floating up again, flowing back and sticking to the wall to form glue.

[0074] The inclined plate sedimentation zone 14 is located at one end of the baffle gradient buffer distribution zone 10 inside the integrated circulating sedimentation tank 9, and the baffle gradient buffer distribution zone 10 is connected to the inclined plate sedimentation zone 14. It is used for the gravity sedimentation of heavy colloidal sludge. Specifically, the interior of the integrated circulating sedimentation tank 9 is divided into the baffle gradient buffer distribution zone 10 and the inclined plate sedimentation zone 14 in sequence by partitions along the waste liquid flow direction. The waste liquid inside the baffle gradient buffer distribution zone 10 can enter the inclined plate sedimentation zone 14 through the connecting channel or pipe.

[0075] Preferably, the inclined plate sedimentation zone 14 is equipped with a modular snap-on inclined plate 15, specifically with a 60° inclination angle. A low-viscosity anti-organic adhesive coating can be sprayed onto the substrate surface of the modular snap-on inclined plate 15. The inclination of the modular snap-on inclined plate 15 significantly reduces the probability of colloidal adhesion and improves the self-weight sliding and settling efficiency of the sol sludge. The bottom of the inclined plate sedimentation zone 14 forms a conical sludge collection hopper 19 through a bidirectional conical sludge collection slope, which is used to collect the heavy colloidal sludge that settles by its own weight. The bottom of the conical sludge collection hopper 19 is equipped with an impeller-less air-lift sludge discharge pipe 20, which is used to stably discharge the heavy colloidal sludge. Specifically, it is installed at the lowest point of the conical sludge collection hopper 19 to realize the intermittent discharge of sludge by pushing it with compressed air; it is suitable for the conveying of high-viscosity sludge and completely eliminates caking and blockage.

[0076] In this embodiment, the air-lift sludge discharge pipeline 20 completely eliminates the mechanical impeller conveying structure that is prone to jamming. It relies on compressed air pressure to push the high-viscosity colloidal sludge out intermittently, thus completely avoiding the equipment defects of viscous colloids entangled and jamming moving parts and large-area colloid hardening at the bottom of the pool.

[0077] The clear water circulation zone 16 is separated from the inclined plate sedimentation zone 14 inside the integrated circulating sedimentation tank 9 by a vertical overflow baffle 18. It is located away from the baffle gradient buffer water distribution zone 10 and is used to store the clarified absorption liquid after removing scum and sludge.

[0078] Preferably, a strip-shaped overflow port is reserved at the upper part of the vertical overflow baffle 18 to allow the clarified liquid in the inclined plate sedimentation zone 14 to overflow into the clear water circulation zone 16; this ensures that only the clarified absorbent after removing colloidal scum and heavy colloidal sludge is allowed to overflow into the clear water circulation zone 16, thereby achieving clear sludge stratification and clean sludge separation, and preventing the continuous circulation and accumulation of colloids.

[0079] The clear water circulation outlet 23 is located at the bottom of the clear water circulation zone 16 and is used to transport the clarified absorbent inside the clear water circulation zone 16 to the circulation pump 24. The output end of the clear water circulation outlet 23 is connected to the circulation pump 24, which is used to receive the clarified absorbent transported by the clear water circulation outlet 23 and pressurize it to transport it to the spray circulation outlet main pipe 26. The output end of the circulation pump 24 is connected to the spray circulation outlet main pipe 26, which is used to transport the received clarified absorbent into the spray circulation inlet main pipe 3 to form a closed loop circulation of the absorbent.

[0080] The intelligent automatic control component is used to regulate the internal structure of the integrated circulating sedimentation tank 9. Specifically, the included differential pressure linkage automatic control unit and liquid level interlock control unit are electrically connected to the spray circulation pipeline and the integrated circulating sedimentation tank 9, respectively, to realize the prediction of colloidal siltation and automatic anti-blocking and anti-caking control.

[0081] The intelligent self-control components include:

[0082] The PLC automatic control cabinet 7 is located outside the integrated circulating sedimentation tank 9. It is used to receive signals from the liquid level sensor 13 and the differential pressure sensor 25 and output linkage control commands.

[0083] In this embodiment, liquid level and differential pressure signals can also be collected through the PLC automatic control cabinet 7, which can predict the trend of trace amount of colloid accumulation in the pipeline in advance and automatically start the flushing, slag discharge and sewage discharge process to realize unattended operation of the equipment to prevent colloid formation and blockage.

[0084] Differential pressure linkage automatic control unit is used to detect differential pressure inside the pipeline;

[0085] The differential pressure linkage automatic control unit includes a differential pressure sensor 25, which is installed between the circulating pump 24 and the spray circulating liquid outlet main pipe 26. When a small amount of colloid adheres to the inner wall of the spray circulating liquid outlet main pipe 26 and the pipeline differential pressure rises above the preset threshold, the PLC automatic control cabinet 7 automatically triggers the air-lift sludge discharge pipeline 20 to discharge sludge, the electric slag discharge valve 17 to discharge slag, and the tower body flushing mechanism to operate synchronously, so as to achieve early prediction and active anti-blocking.

[0086] The liquid level interlock control unit is used to detect the liquid level inside the inclined plate sedimentation zone 14 and the clear water circulation zone 16;

[0087] The liquid level interlock control unit includes a liquid level sensor 13, which is installed inside the inclined plate sedimentation area 14 and the clear water circulation area 16 respectively. At the same time, the liquid level sensor 13 is linked with the water replenishment valve and the waste liquid discharge valve to automatically complete the system water replenishment and discharge of high-concentration colloidal waste liquid exceeding the standard, ensuring the long-term stable operation of the equipment.

[0088] Example 2

[0089] Based on the above embodiment one, an application is disclosed for use in the main production model of engineering, which is adapted to the production of 15000 m³ / h spraying exhaust gas.

[0090] The main body 2 of the cyclone spray tower has a total height of 6200 mm and an inner diameter of 1800 mm. The high-temperature exhaust gas inlet pipe 5 on the side is directly connected to the air inlet without a pre-cooling device. Six sets of cyclone spray components 4 are arranged inside the tower, with a single pipe diameter of 25 mm. The spray circulation liquid inlet main pipe 3 provides unified liquid supply. The water distribution pipe has φ8 mm cyclone diversion holes on its wall, and the micro-orifice nozzles are eliminated throughout the process. The rated flow rate of the spray circulation liquid is 12 m³ / h, the exhaust gas treatment air volume is 15000 m³ / h, and the purified exhaust gas is discharged from the purified exhaust gas outlet 1 at the top of the tower.

[0091] The bottom of the tower is equipped with a 15° anti-sticking guide slope 6, and is coated with a polytetrafluoroethylene anti-sticking coating. The waste liquid flows by gravity into the integrated circulating sedimentation tank 9 through the bottom outlet channel 8.

[0092] The integrated circulating sedimentation tank 9 has an overall length of 7500 mm, a width of 2600 mm, and an effective water depth of 2200 mm. It is supported by a steel structure 21 and is internally divided into three zones.

[0093] The 10 baffle-type gradient buffer water distribution zone is 2200 mm long and has 8 sets of high and low staggered baffles 12 to form a 12-minute steady flow residence time, stabilize the flow state of high-colloid waste liquid, and prevent colloidal flocs from floating back.

[0094] 2. Inclined plate sedimentation zone 14 is 3300 mm long and is equipped with modular snap-on inclined plates 15 with an inclination angle of 60°. The plate surface is sprayed with a low-adhesion anti-adhesive coating. The sedimentation residence time of colloidal sludge is 25 min. The sludge is collected into a conical sludge collection hopper 19 and intermittently discharged through an air-lift sludge discharge pipeline 20.

[0095] The 3 clean water circulation zone 16 is 2000 mm long and is used to store the clarified absorption liquid. The clarified liquid enters this zone through the vertical overflow baffle 18 and is sent to the circulation pump 24 through the clean water circulation outlet 23.

[0096] The full-length scum collection weir 11 at the top of the pool is 2600 mm long and installed 4 mm below the liquid surface. A DN40 electric scum discharge valve 17 is installed at the end, and the scum is discharged separately through the scum discharge channel 22. The conical sludge collection hopper 19 at the bottom of the pool has a bidirectional slope angle of 12°, and a DN50 air-lift sludge discharge pipe 20 is installed at the lowest point. The working air pressure is 0.3 MPa, and there is no blockage or caking.

[0097] The automatic control system is equipped with a liquid level sensor 13 and a differential pressure sensor 25, with a differential pressure threshold of 0.5MPa and high and low liquid level thresholds of 1.0~2.1 m. The PLC automatic control cabinet 7 automatically completes the anti-adhesive rinsing, slag discharge, water replenishment, and sewage discharge operations.

[0098] Results of 90 days of continuous operation: No pipe blockage, no glue buildup on the main body of the cyclone spray tower, and no bottom slab buildup in the integrated circulating sedimentation tank; no need for manual shutdown to clean the colloids or the tank; fully automatic separation and discharge of floating glue and sludge; hazardous waste production is reduced by 38% compared to traditional water washing equipment.

[0099] Example 3

[0100] Based on the above embodiment one, an application is disclosed for use in a small pilot model, adapted to a 3000 m³ / h exhaust gas condition.

[0101] The overall structural principle is the same as in Example 2, but scaled down proportionally to adapt to low air volume conditions:

[0102] The main body of the cyclone spray tower has a diameter of 800 mm and a processing air volume of 3000 m³ / h. The cyclone spray assembly has a water distribution pipe diameter of 20 mm. The air-lift sludge discharge pipeline has a working air pressure of 0.25 MPa. The differential pressure sensor has a preset differential pressure threshold of 0.4 MPa.

[0103] Continuous 30-day high-load adhesive waste liquid operation test: The equipment showed no glue clogging or wall accumulation, the colloid was completely separated, the liquid level sensor 13 and differential pressure sensor 25 provided accurate monitoring, the PLC automatic control cabinet 7 had stable linkage action, and no manual intervention was required throughout the process.

[0104] Comparative example (traditional conventional water washing spray equipment)

[0105] Under the same conditions of spraying condensable waste gas and using matching absorbents, the performance of traditional microporous spray towers, flat-bottomed water tanks, and impeller sludge removal equipment is as follows:

[0106] 1. The micro-orifice nozzles were completely clogged by the colloid within 2 days, causing the spray to fail.

[0107] 2. Colloidal flocs cannot settle in layers, resulting in full-process circulation and reflux, and large areas of the tower wall are covered with adhesive.

[0108] 3. Stubborn sludge began to form at the bottom of the pool after 7 days and could not be cleaned automatically;

[0109] 4. The water tank must be emptied, the adhesive manually removed, and the tower body washed every 15 days, resulting in significant downtime and work disruption;

[0110] 5. Without differential pressure and intelligent liquid level monitoring components, the equipment cannot achieve continuous and stable operation for more than 48 hours.

[0111] Example 4

[0112] Based on the above embodiment one, a spray purification method for preventing the condensable waste gas from forming adhesive residue and clogging is disclosed, the steps of which are as follows:

[0113] S1: The high-temperature exhaust gas from the curing process of the spraying production line is directly sent into the interior of the cyclone spray tower body 2 through the high-temperature exhaust gas inlet pipe 5. The exhaust gas contains a large amount of low-temperature condensable organic components. The existing special high-temperature absorbent is transported to the large-diameter non-clogging cyclone spray component 4 through the spray circulation liquid inlet pipe 3 to complete the dissolution of gaseous organic matter. The purified exhaust gas is discharged from the purified exhaust gas outlet 1 at the top of the tower.

[0114] S2: The equipment adopts a large-diameter non-clogging cyclone spray component 4 to be adapted to the large-flow circulation spray of the adhesive absorption liquid. It avoids the risk of adhesive blockage by relying on the non-microporous structure, and at the same time, it uses the anti-sticking guide slope 6 at the bottom of the tower to avoid the accumulation of adhesive on the inner wall of the cyclone spray tower body 2.

[0115] S3: The high-colloidal waste liquid after sol quickly collects along the anti-sticking guide slope 6 at the bottom of the tower, and flows by gravity into the baffle gradient buffer water distribution area 10 of the integrated circulating sedimentation tank 9 through the liquid outlet connection channel 8 at the bottom of the tower. After being stabilized and slowed down by the baffle plate 12 and the flocs are suppressed from floating, it enters the inclined plate sedimentation area 14 evenly.

[0116] S4: Light oily colloidal scum suspended on the liquid surface is intercepted by the full-length scum collection weir 11, and discharged independently by the electric scum discharge valve 17 and the scum discharge channel 22; Heavy colloidal sludge in the waste liquid slides down the modular snap-on inclined plate 15 under the action of gravity to the conical sludge collection hopper 19 for collection, and is automatically discharged periodically through the impeller-less air-lift sludge discharge pipeline 20 to achieve the separation of the three phases of glue, water and sludge.

[0117] S5: The clarified absorbent liquid, after thoroughly removing the colloidal scum and colloidal sludge, passes through the upper overflow port of the vertical overflow baffle 18 and enters the clear water circulation zone 16. It then flows into the circulation pump 24 for pressurization through the clear water circulation outlet 23 and flows back to the main body of the cyclone spray tower 2 through the spray circulation outlet main pipe 26, thus realizing the closed-loop circulation of the absorbent liquid.

[0118] S6: The system monitors the colloidal siltation conditions in the pipeline and water tank in real time through the liquid level sensor 13 and differential pressure sensor 25. The signal is transmitted to the PLC automatic control cabinet 7, which automatically performs tower flushing, slag discharge, water replenishment and sewage discharge operations, so as to realize the equipment circulation pump can operate continuously and stably 24 hours a day without human intervention to prevent caking and blockage.

[0119] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A spray purification device for preventing the condensation and clogging of exhaust gas, characterized in that, include: A cyclone spray tower is used to transport treated waste gas into an integrated circulating sedimentation tank (9). An integrated circulating sedimentation tank (9) is installed at the bottom of the cyclone spray tower and is used to separate the gas transported by the cyclone spray tower into three-stage waste liquid. Intelligent self-control components are used for internal regulation of the integrated circulating sedimentation tank (9).

2. The spray purification equipment for preventing condensable waste gas from forming adhesive and clogging, as described in claim 1, is characterized in that... The cyclone spray tower includes: The main body (2) of the cyclone spray tower is used to allow the waste gas and the absorbent liquid to react in the interior; the interior of the main body (2) of the cyclone spray tower is uniformly provided with cyclone spray components (4). The spray circulation inlet main pipe (3) is set on one side of the cyclone spray tower body (2) and is used to transport the adhesive-containing absorbent liquid to the cyclone spray assembly (4); The high-temperature exhaust gas inlet pipe (5) is located at the bottom of one side of the main body (2) of the cyclone spray tower; The anti-sticking guide slope (6) at the bottom of the tower is inclined and set at the bottom of the main body (2) of the vortex spray tower.

3. The spray purification equipment for preventing condensable waste gas from forming adhesive and clogging, as described in claim 1, is characterized in that... The top of the integrated circulating sedimentation tank (9) is provided with a full-length scum collection weir (11). At one end of the integrated circulating sedimentation tank (9) and at the top of the full-length scum collection weir (11), a scum electric discharge valve (17) is fixed. The output end of the scum electric discharge valve (17) is connected to a scum discharge channel (22).

4. The spray purification equipment for preventing condensable waste gas from forming adhesive and clogging, as described in claim 1, is characterized in that... The top of the integrated circulating sedimentation tank (9) is fixed with a bottom liquid outlet communication channel (8), and the bottom of the integrated circulating sedimentation tank (9) is fixed with a tank body support steel structure (21) for supporting the weight of the integrated circulating sedimentation tank (9).

5. The spray purification equipment for preventing the condensable waste gas from forming adhesive and clogging, as described in claim 1, is characterized in that... The integrated circulating sedimentation tank (9) includes: The baffle-type gradient buffer water distribution zone (10) is located at one end inside the integrated circulating sedimentation tank (9) and is used to receive the high colloidal waste liquid discharged from the main body (2) of the swirl spray tower. The inclined plate sedimentation zone (14) is located at one end of the baffle gradient buffer water distribution zone (10) inside the integrated circulating sedimentation tank (9) and is used for gravity sedimentation of heavy colloidal sludge. The clear water circulation zone (16) is separated from the inclined plate sedimentation zone (14) inside the integrated circulating sedimentation tank (9) by a vertical overflow baffle (18) at one end away from the baffle gradient buffer water distribution zone (10); A clean water circulation outlet (23) is located at the bottom of the clean water circulation area (16). The output end of the clean water circulation outlet (23) is connected to a circulation pump (24), and the output end of the circulation pump (24) is connected to a spray circulation liquid outlet main pipe (26).

6. The spray purification equipment for preventing the condensable waste gas from forming adhesive and clogging, as described in claim 5, is characterized in that... The baffle gradient buffer water distribution area (10) is staggered with high and low layered baffles (12), and the inclined plate sedimentation area (14) is inclined with modular snap-on inclined plates (15).

7. A spray purification device for preventing the condensable waste gas from forming adhesive and clogging, as described in claim 5, is characterized in that... The bottom of the inclined plate sedimentation zone (14) forms a conical sludge collection hopper (19) through a bidirectional conical sludge collection slope, which is used to collect heavy colloidal sludge that settles by its own weight. The bottom of the conical sludge collection hopper (19) is equipped with an impellerless air-lift sludge discharge pipeline (20) for stable discharge of heavy colloidal sludge.

8. A spray purification device for preventing condensable waste gas from forming adhesive and clogging, as described in claim 5, is characterized in that... The intelligent self-control component includes: The PLC automatic control cabinet (7) is located on the outside of the integrated circulating sedimentation tank (9) and is used to receive signals from the liquid level sensor (13) and the differential pressure sensor (25) and output linkage control commands. Differential pressure linkage automatic control unit is used to detect differential pressure inside the pipeline; The liquid level interlock control unit is used to detect the liquid level inside the inclined plate sedimentation zone (14) and the clear water circulation zone (16).

9. A spray purification device for preventing condensable waste gas from forming adhesive and clogging, as described in claim 8, is characterized in that... The differential pressure linkage automatic control unit includes a differential pressure sensor (25), which is installed between the circulating pump (24) and the spray circulation outlet main pipe (26); The liquid level interlock control unit includes a liquid level sensor (13), which is installed on the inner side of the inclined plate sedimentation zone (14) and the clear water circulation zone (16), respectively.

10. A method for preventing the condensable waste gas from forming adhesive and clogging through spraying, used in the spraying purification equipment for preventing the condensable waste gas from forming adhesive and clogging as described in any one of claims 1-9, characterized in that, The steps are as follows: S1: The high-temperature exhaust gas from the coating production line is directly sent into the main body (2) of the cyclone spray tower through the high-temperature exhaust gas inlet pipe (5). The high-temperature absorbent is transported to the cyclone spray assembly (4) through the spray circulation liquid inlet pipe (3) to complete the gas phase organic matter dissolution operation. The purified exhaust gas is discharged from the purified exhaust gas outlet (1) at the top of the tower. S2: The high-colloidal waste liquid after sol quickly gathers along the bottom anti-sticking guide slope (6) of the tower bottom, and flows by gravity into the baffle gradient buffer water distribution area (10) of the integrated circulating sedimentation tank (9) through the bottom liquid outlet connecting channel (8). After being stabilized and slowed down by the baffle plate (12) and inhibited from floating flocs, it enters the inclined plate sedimentation area (14) evenly. S3: Light oily colloidal scum suspended on the liquid surface is intercepted separately by the full-length scum collection weir (11) and discharged independently by the electric scum discharge valve (17) and the scum discharge channel (22); Heavy colloidal sludge in the waste liquid slides down the modular snap-on inclined plate (15) under the action of gravity to the conical sludge collection hopper (19) for collection, and is automatically discharged periodically through the impellerless air-lift sludge discharge pipeline (20); S4: The clarified absorbent after thoroughly removing colloidal scum and colloidal sludge passes through the upper overflow port of the vertical overflow baffle (18) and enters the clear water circulation zone (16). It flows into the circulation pump (24) for pressurization through the clear water circulation outlet (23) and returns to the main body of the vortex spray tower (2) through the spray circulation outlet main pipe (26) to realize the closed-loop circulation of the absorbent. S5: In steps S1-S4, the liquid level sensor (13) and differential pressure sensor (25) monitor the colloidal siltation conditions of the pipeline and water tank in real time, and transmit the signals to the PLC automatic control cabinet (7) to automatically perform tower flushing, slag discharge, water replenishment and sewage discharge operations.

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