A VOCs exhaust gas RTO heat accumulation combustion treatment system

Abstract

The application discloses a VOCs waste gas RTO heat accumulation combustion treatment system and belongs to the technical field of VOCs waste gas treatment. The system comprises two VOCs waste gas filtering devices. The VOCs waste gas filtering device comprises a tank body and a cover body. Three waste gas treatment mechanisms are arranged in the tank body. The waste gas treatment mechanism comprises a first cylinder body and a second cylinder body. An accommodating area is formed in the upper side of the second cylinder body. A limiting cover is connected to the upper end of the second cylinder body through bolts. A space between the lower side of the limiting cover and the upper side of the accommodating area forms a laying cavity with a fan ring structure. Zeolite particles are filled in the laying cavities of the three waste gas treatment mechanisms. The zeolite particles are stacked when adsorption is performed, the contact area is increased, the peak value of VOCs concentration is better adapted, the zeolite particles are uniformly laid when desorption is performed, the heat balance is ensured, the desorption efficiency is improved, the desorption is more thorough, the adsorption and the desorption are simultaneously performed, the continuity of waste gas treatment is ensured, and the working efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the technical field of VOCs waste gas treatment, and more specifically relates to a VOCs waste gas RTO regenerative thermal combustion treatment system. Background Technology

[0002] VOCs exhaust gas RTO (Regenerative Thermal Oxidizer) systems are commonly used VOCs terminal treatment equipment in the industrial field, widely applied in industries such as chemicals, coatings, and building materials. The core structure includes an activated carbon adsorption device for pre-treating low-concentration VOCs and filtering particulate matter, 2-3 regenerator chambers with built-in ceramic regenerators, a combustion chamber with a temperature range of 800-1200℃, a reversing valve for controlling airflow switching, and a matching automatic control system. Its operating logic is as follows: VOCs exhaust gas is first concentrated by the activated carbon adsorption device and then enters the RTO. It is then guided through a reversing valve into one of the regenerator chambers, preheated by the ceramic regenerator, and then sent to the combustion chamber. Under the heating of auxiliary fuel, the VOCs are oxidized and decomposed into CO2 and H2O at high temperature. The high-temperature flue gas after combustion enters another regenerator chamber to release heat and complete heat storage. After cooling, it meets emission standards. The reversing valve periodically switches the airflow direction, allowing the regenerator chambers to alternately achieve a "heat storage-heat release" cycle, continuously recovering waste heat to reduce operating energy consumption and ensure continuous VOCs treatment.

[0003] During the production of artificial stone (raw material stirring, mixing, pressure molding, high-temperature curing, leveling and thickness setting, polishing, and cutting), a large amount of volatile organic compounds (VOCs) are generated in the raw material processing stage. The main components include aromatic hydrocarbons, halogenated hydrocarbons, alkanes, and alkenes. Currently, the industry mostly uses activated carbon adsorption devices in conjunction with RTO systems for VOCs treatment. However, there are significant technical shortcomings in practical applications: activated carbon is easily affected by moisture in the production environment, and its porous structure is easily occupied by moisture, resulting in a significant decrease in the adsorption effect on VOCs. Moreover, during peak production periods, the amount of VOCs generated increases sharply, and the adsorption capacity of activated carbon is difficult to match. This not only significantly reduces the adsorption efficiency but also accelerates aging due to overload operation, shortening its service life and ultimately increasing the economic cost of VOCs disposal for enterprises. To improve adsorption performance, the industry has attempted to replace activated carbon with zeolite, which has superior adsorption properties. Zeolite is packed into the filter cartridge in a stacked state, utilizing its porous structure to fully contact the exhaust gas and achieve efficient adsorption of VOCs, thereby increasing the concentration. However, in the subsequent VOCs desorption and regeneration stage (which requires heating to release the adsorbed VOCs), the stacked state brings new technical problems (if directly dispersed, dense pore channels cannot be formed between particles, resulting in weak adsorption capacity): the zeolite in the middle of the stack is difficult to heat, and the low temperature leads to incomplete VOCs desorption. Residual pollutants will occupy adsorption sites, affecting subsequent adsorption efficiency. This not only reduces the reusability of zeolite but also increases the energy consumption of the desorption process and shortens the overall service life of the zeolite. Summary of the Invention

[0004] This invention addresses the problem of overly simplistic solutions in existing technologies by providing a significantly different approach. Belonging to the technical field of VOCs waste gas treatment, this invention primarily offers a VOCs waste gas RTO regenerative thermal combustion treatment system. This system addresses the technical problem mentioned in the background section where, during zeolite desorption, the portion located in the middle of a zeolite pile is difficult to heat, resulting in low temperatures and incomplete VOCs desorption, thus affecting subsequent adsorption efficiency.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: A VOCs waste gas RTO regenerative thermal oxidizer system includes two VOCs waste gas filtration devices connected by a pipeline. Each VOCs waste gas filtration device includes a tank and a cover, which are bolted together. Three stacked waste gas treatment mechanisms are arranged inside the tank. Each waste gas treatment mechanism includes a first cylinder and a second cylinder, with the second cylinder located above the first cylinder. The first cylinder has a placement chamber and a first channel, which are connected. The second cylinder has a second channel, the lower end of which is connected to the upper end of the first channel. The upper side of the two cylinders has a recessed receiving area with a frustum structure, which is connected to the second channel. The upper end of the second cylinder is bolted to a limiting cover with an inverted frustum structure. The space between the lower side of the limiting cover and the upper side of the receiving area forms a fan-shaped laying cavity. A motor is installed in the middle of the limiting cover. The output end of the motor is equipped with a composite shaft and a threaded sleeve on the composite shaft. The threaded sleeve is bolted to a support plate, which slides up and down in the placement cavity. The placement cavities of the three waste gas treatment mechanisms are all filled with zeolite particles, and with the cooperation of the composite shaft and the support plate, the zeolite particles can be moved from the placement cavity to the laying cavity.

[0006] Preferably, the zeolite particles placed in the cavity of the three waste gas treatment mechanisms are, from bottom to top, the first zeolite particle, the second zeolite particle, and the third zeolite particle, and the pore size of the first zeolite particle, the second zeolite particle, and the third zeolite particle gradually decreases.

[0007] Preferably, the composite shaft includes a helical part and a threaded part. The helical part rotates within the space formed by the first channel and the second channel. Multiple baffles are evenly spaced on the upper side of the helical part along the helical direction. The threaded part rotates within the placement cavity. The threaded part and the threaded sleeve are meshed together.

[0008] Preferably, the limiting cover is provided with a plurality of vent holes at equal intervals around it, and an annular limiting protrusion is provided at the outer edge of the lower side of the limiting cover, with the lower side of the annular limiting protrusion contacting and engaging with the receiving area.

[0009] Preferably, the second cylinder is provided with multiple gas channels arranged at equal intervals, and the upper end of each gas channel is connected to the laying cavity.

[0010] Preferably, an annular cavity is provided on the upper side of the first cylinder, and sealing rings are provided in the grooves on both the inner and outer sides of the annular cavity. A heating interface is provided on one side of the outer wall of the first cylinder, and the heating interface is connected to the annular cavity. A heating pipe is connected to the heating interface by bolts, and the heating pipe passes through the round hole on the corresponding tank.

[0011] Preferably, the tray has multiple air inlets arranged at equal intervals around it, and two limiting ports are provided at the outer edge of the tray. Each limiting port is slidably connected to a limiting strip, which is provided on both sides of the inner wall of the placement cavity.

[0012] Preferably, the bottom of the first cylinder is connected to a support plate by bolts, and a bearing is provided in the circular hole on the support plate, and the inner edge of the bearing is engaged with the lower end of the composite shaft.

[0013] Preferably, both tanks are provided with an air inlet pipe and a first valve on the air inlet pipe at the bottom, and the two air inlet pipes are connected by bolts to a first three-way connector, which is connected by bolts to an input pipe for transporting waste gas.

[0014] Preferably, each of the two covers is provided with a second and a third connector at its upper end, and a second valve and a third valve are respectively provided in two directions on the second and third connectors. A third connector is provided between the two second and third connectors, and the third connector is connected to an output pipe by bolts.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The present invention achieves the dual goals of maximizing adsorption efficiency and optimizing desorption effect by setting up a tank, cover, air inlet pipe, first three-phase connector, input pipe, second three-phase connector, third three-phase connector, output pipe, first valve, second valve, third valve and waste gas treatment mechanism, thereby switching the morphological state of zeolite particles in the adsorption and desorption stages. In the adsorption stage, zeolite particles are piled up in the placement cavity to form a dense adsorption layer, which greatly increases the contact area and contact time with waste gas. It can fully adapt to the working conditions of VOCs increase sharply during the concentrated production period, quickly intercept high concentration mixed VOCs, avoid the problem of insufficient adsorption caused by "through flow", and reduce airflow resistance by relying on the stacking structure to reduce the energy consumption of waste gas transportation. During the desorption stage, zeolite particles are laid in a fan-shaped ring structure in the cooperation of the motor, composite shaft, threaded sleeve, pallet, support plate and bearing. This changes the shortcomings of the traditional stacking state, which is "insufficient heating in the middle and local overheating at the outer edge". This allows the zeolite particles to come into uniform contact with the hot gas. On the one hand, this ensures more thorough VOCs desorption, avoids residual pollutants occupying adsorption sites, ensures stable subsequent adsorption performance and does not reduce the reusability of zeolite. On the other hand, it also avoids the high-temperature heating of a certain angle or direction of some zeolite during each heating, which would damage the zeolite crystal structure. This extends the reusable service life of zeolite. At the same time, the uniform heating state also reduces the heat consumption required for desorption and improves energy utilization efficiency.

[0016] In addition, the left and right tanks alternately switch between adsorption and desorption, and the control of the form switching ensures that VOCs treatment is continuous and uninterrupted, which is suitable for the needs of continuous industrial production.

[0017] (2) By setting up a waste gas treatment mechanism, first zeolite particles, second zeolite particles and third zeolite particles, the present invention realizes the setting of three levels of zeolite particles with gradually decreasing pore size in the same tank (the first zeolite particles have a larger pore size, the second zeolite particles have a moderate pore size, and the third zeolite particles have a smaller pore size), and constructs a targeted gradient adsorption system, which is better adapted to the complex component characteristics of "aromatic hydrocarbons (large molecules) + halogenated hydrocarbons (medium molecules) + alkanes / olefins (small molecules)" in the waste gas of artificial stone production. The first zeolite particles preferentially adsorb large aromatic hydrocarbon molecules, preventing them from clogging the adsorption channels of subsequent small-pore zeolites. The second zeolite particles precisely intercept medium-molecular-weight halogenated hydrocarbons, fully utilizing their pore size adaptability to enhance adsorption capacity. The third zeolite particles efficiently capture small-molecule alkanes / olefins, achieving full-component coverage of mixed VOCs. This staged adsorption design avoids the problem of uneven adsorption capacity of single-pore-size zeolites for VOCs of different molecular sizes. Furthermore, through the "large first, small later" interception logic, it maximizes the adsorption potential of each stage of zeolite, significantly improving the overall VOCs adsorption efficiency and concentration factor. This provides high-concentration VOCs gas for subsequent RTO high-temperature oxidation treatment, reduces RTO combustion energy consumption, and reduces the risk of direct emission of unadsorbed VOCs, thereby improving the stability of environmental governance compliance.

[0018] (3) The present invention realizes the use of the waste heat generated by RTO combustion as the heat source for zeolite desorption by setting up a tank, cover, first cylinder, annular cavity, heating interface, second cylinder, gas flow channel, laying cavity, heating pipeline, second and third joint, third and third joint, output pipeline, second valve and third valve, and constructs a gas circulation system of "RTO-desorption tank-RTO". The waste heat recovery replaces the traditional external heating method, and there is no need to consume natural gas or electricity, which greatly reduces the energy consumption cost of the zeolite desorption stage. In addition, during the cycle, the gas heated by waste heat forms an energy cycle between the desorption tank and the RTO, which not only increases the RTO inlet temperature and further reduces the auxiliary fuel consumption required for combustion, but also ensures the temperature stability of the zeolite desorption process through the circulating airflow, thereby improving the desorption efficiency and forming a virtuous cycle of "waste heat utilization - high-efficiency desorption - energy-saving combustion", taking into account both economic and environmental benefits.

[0019] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is an exploded view of the overall structure of the present invention; Figure 3 This is a schematic diagram of three stacked waste gas treatment mechanisms inside the tank of the present invention. Figure 4 This is a schematic diagram of the waste gas treatment mechanism of the present invention; Figure 5 This is an exploded view of the waste gas treatment mechanism of the present invention; Figure 6 This is a schematic diagram of the first cylindrical structure of the present invention; Figure 7 This is a schematic cross-sectional view of the first cylindrical body of the present invention; Figure 8 This is a schematic cross-sectional view of the second cylindrical body of the present invention; Figure 9 This is a schematic cross-sectional view of the limiting cover of the present invention; Figure 10 This is a schematic diagram of the composite shaft structure of the present invention; Figure 11 This is a schematic diagram of the structure of the first zeolite particles, the second zeolite particles, and the third zeolite particles in a stacked state in the placement cavity according to the present invention. Figure 12 This is a schematic diagram of the pallet structure of the present invention; Figure 13 This is a schematic diagram of the support plate structure of the present invention; Figure 14 This is a cross-sectional schematic diagram of the waste gas treatment mechanism of the present invention; Figure 15 This is a schematic diagram of the gas flow path in the three waste gas treatment mechanisms inside the tank under the zeolite adsorption VOCs state of the present invention. Figure 16 This is a schematic diagram of the gas flow path in the three waste gas treatment mechanisms inside the tank under the zeolite desorption VOCs state of the present invention.

[0021] In the diagram: 1. VOCs exhaust gas filtration equipment; 11. Tank; 12. Cover; 13. Inlet pipe; 14. First three-phase connector; 15. Input pipe; 16. Second three-phase connector; 17. Third three-phase connector; 18. Output pipe; 2. Exhaust gas treatment mechanism; 21. First cylinder; 211. Placement chamber; 212. First channel; 213. Annular cavity; 214. Heating interface; 215. Limiting strip; 22. Second cylinder; 221. Receiving area; 222. Gas flow channel; 223. Second channel; 23. Limiting cover; 231. Exhaust port; 232. Annular limiting protrusion; 233. Laying cavity; 24. Motor; 25. Composite shaft; 251. Spiral part; 252. Threaded part; 253. Stop bar; 26. Threaded sleeve; 27. Support plate; 271. Air inlet; 272. Limiting port; 28. Support plate; 281. Bearing; 29. ​​Sealing ring; 3. First valve; 4. Second valve; 5. Third valve; 6. Heating pipe; 7. First zeolite particles; 8. Second zeolite particles; 9. Third zeolite particles. Detailed Implementation

[0022] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be given below with reference to the accompanying drawings, which illustrate several embodiments of the present invention. However, the present invention can be implemented in different forms and is not limited to the embodiments described in the text. Rather, these embodiments are provided to make the disclosure of the present invention more thorough and complete.

[0023] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly associated with those skilled in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0025] For the implementation examples, please refer to the appendix. Figure 1-16As shown, a VOCs waste gas RTO regenerative thermal combustion treatment system includes two VOCs waste gas filtration devices 1, which are connected by pipelines. Each VOCs waste gas filtration device 1 includes a tank 11 and a cover 12, which are bolted together. Three stacked waste gas treatment mechanisms 2 are arranged inside the tank 11. Each waste gas treatment mechanism 2 includes a first cylinder 21 and a second cylinder 22, with the second cylinder 22 located above the first cylinder 21. The first cylinder 21 has a placement cavity 211 and a first channel 212, which are connected. The second cylinder 22 has a second channel 223, the lower end of which is connected to the upper end of the first channel 212. A concave, frustum-shaped receiving area 2 is formed on the upper side of the second cylinder 22. 21. The receiving area 221 is connected to the second channel 223. The upper end of the second cylinder 22 is bolted to a limiting cover 23 with an inverted frustum structure. The space between the lower side of the limiting cover 23 and the upper side of the receiving area 221 forms a fan-shaped laying cavity 233. A motor 24 is set in the middle of the limiting cover 23. A composite shaft 25 is set at the output end of the motor 24, and a threaded sleeve 26 is set on the composite shaft 25. The threaded sleeve 26 is bolted to a support plate 27. The support plate 27 slides up and down in the placement cavity 211. The placement cavities 211 of the three waste gas treatment mechanisms 2 are filled with zeolite particles. With the cooperation of the composite shaft 25 and the support plate 27, the zeolite particles can be moved from the placement cavity 211 to the laying cavity 233. The lower end of the first channel 212 is flared, which facilitates the entry of zeolite particles from the placement cavity 211 into the first channel 212.

[0026] The specific operation is as follows (facing the attached diagram, the positional relationship is described as left and right): The two VOCs exhaust gas filtration devices 1 can work simultaneously to ensure that the adsorption and desorption of VOCs by the zeolite particles are carried out simultaneously. For example, when the VOCs exhaust gas filtration device 1 on the left side is adsorbing and concentrating the VOCs generated during the production process, the first valve 3 on the bottom air inlet pipe 13 of the right tank 11 is closed, and the first valve 3 on the bottom air inlet pipe 13 of the left tank 11 is opened. At the same time, the second valve 4 on the second and third connectors 16 on the upper side of the left cover 12 is opened, and the third valve 5 is closed. The exhaust gas during the production process passes through the input pipe 15 and the first and third valves 16 in sequence. The exhaust gas enters the left tank 11 through the top connector 14 and the left-side air inlet pipe 13. Then, the exhaust gas enters the exhaust gas treatment mechanism 2 located at the bottom. The exhaust gas enters the placement chamber 211 through the air inlet 271 on the support plate 27 and comes into contact with the pile of first zeolite particles 7 in the placement chamber 211. Due to the large pore size of the first zeolite particles 7, they can mainly adsorb the aromatic hydrocarbons in the exhaust gas. After the exhaust gas passes through the placement chamber 211, it will then pass through the first channel 212, the second channel 223 and the laying chamber 233 in sequence, and then flow out from the exhaust hole 231 on the limiting cover 23 into the next exhaust gas treatment mechanism 2. The exhaust gas repeats the above flow path (as shown in the attached diagram). Figure 15 As shown), the first zeolite particles 7, the second zeolite particles 8 and the third zeolite particles 9 are placed in the three placement chambers 211 in the same tank 11, respectively. The pore size of the second zeolite particles 8 is moderate, so it is mainly used to adsorb halogenated hydrocarbons in the waste gas. The pore size of the third zeolite particles 9 is smaller, so it is mainly used to adsorb alkanes / olefins in the waste gas. After the waste gas passes through the three waste gas treatment mechanisms 2 from bottom to top, it can be discharged from the fourth valve of the second and third connectors 16 on the upper side of the left cover 12. At this time, the VOCs exhaust gas filtration device 1 on the right side begins to desorb the VOCs concentrated by zeolite adsorption. The third valve 5 in the second and third connector 16 on the upper side of the right cover 12 opens and the second valve 4 closes. Then, the motor 24 drives the composite shaft 25 to rotate. Simultaneously, the threaded part 252 and the spiral part 251 on the composite shaft 25 rotate synchronously. The threaded sleeve 26 on the threaded part 252 drives the support plate 27 to move upward. The pile of zeolite particles on the support plate 27 rises and enters the flared end of the first channel 212, where it interacts with the spiral part. The lower end of section 251 contacts the spiral section 251, and then, driven by the spiral section 251 and the baffle 253, the zeolite particles spiral upward in the first channel 212 and the second channel 223. When the zeolite particles rise to the upper end of the first channel 212, due to the action of the limiting cover 23 and the second body top receiving area 221, the zeolite particles move into the surrounding fan-shaped laying cavity 233 until the support plate 27 moves to the upper end of the threaded section 252, at which point the motor 24 stops rotating. At this time, most of the zeolite particles have been laid in the laying cavity. In cavity 233 (a small amount of zeolite particles will remain in the spiral section 251, as the hot gas will dissipate into the first channel 212 and the second channel 223; therefore, the small amount of zeolite particles in the spiral section 251 can be desorbed by heat without any substantial impact), the heating pipe 6 is then connected to return the hot gas generated by combustion in the RTO to the annular cavity 213. Subsequently, the hot gas acts on the zeolite particles in the laying state in the laying cavity 233 through multiple equally spaced and surrounding gas channels 222, so that the zeolite particles can be heated evenly. To avoid the problem in existing technologies where, in a stacked state, the heat intensity on the middle or the side far from the heating source is insufficient for desorption, after heating, the high-concentration VOCs pass through the exhaust port 231 on the limiting cover 23 and then enter the next waste gas treatment mechanism 2. They pass successively through the placement chamber 211, the first channel 212, and the second channel 223 (at this time, the placement chamber 211, the first channel 212, and the second channel 223 are basically free of zeolite particles; the zeolite particles are mostly within the laying chamber 233) (for example, attached...). Figure 16 As shown), the three exhaust gas treatment units 2 on the right side are all like this. Finally, the exhaust gas passes through the third valve 5 in the second and third connectors 16 on the upper side of the right cover 12, then through the third and third connectors 17, and is guided into the RTO by the output pipe 18 to form a cycle, thoroughly cleaning the high concentration of VOCs. After the zeolite particles in the left tank 11 are saturated with adsorption and the zeolite in the right tank 11 has completed desorption, the valves are switched in reverse so that the zeolite in the left tank 11 begins to desorb and the zeolite in the right tank 11 begins to adsorb, ensuring that the treatment of VOCs can be carried out continuously. Before the adsorption in the right tank 11, the composite shaft 25 can be driven to rotate in reverse by the motor 24. Combined with the gravity of the zeolite itself and the shape characteristics of the low outer edge cover in the middle of the laying cavity 233, the zeolite particles are guided from the laying cavity 233 back to the placement cavity 211.

[0027] Please refer to the appendix carefully. Figure 5-11 As shown, the zeolite particles in the placement chamber 211 of the three waste gas treatment mechanisms 2 are, from bottom to top, the first zeolite particle 7, the second zeolite particle 8, and the third zeolite particle 9, and the pore size of the first zeolite particle 7, the second zeolite particle 8, and the third zeolite particle 9 gradually decreases. The pore size of the first zeolite particle 7 is larger, so it can mainly adsorb aromatic hydrocarbons in the waste gas. The pore size of the second zeolite particle 8 is moderate, so it is mainly used to adsorb halogenated hydrocarbons in the waste gas. The pore size of the third zeolite particle 9 is smaller, so it is mainly used to adsorb alkanes / olefins in the waste gas. The three types of zeolite particles, the first zeolite particle 7, the second zeolite particle 8, and the third zeolite particle 9, have the same external dimensions. The composite shaft 25 includes a helical part 251 and a threaded part 252. The helical part 251 is designed with a porous material and rotates within the space formed by the first channel 212 and the second channel 223. Multiple baffles 253 are evenly spaced on the upper side of the helical part 251 along the helical direction. The baffles 253 prevent the zeolite particles from sliding off the helical part 251 when it is pushed upward by the helical part 251. The threaded part 252 rotates in the placement cavity 211 and is meshed with the threaded sleeve 26. Through the cooperation between the threaded part 252 and the threaded sleeve 26, the support plate 27 is moved upward, compressing the space of the zeolite particles in the placement cavity 211 so that the helical part 251 can transport the zeolite particles into the laying cavity 233. The aperture of the helical part 251 and the thread groove of the threaded part 252 are both smaller than the external dimensions of the zeolite particles, so the zeolite particles will not be embedded and cause blockage or jamming. The limiting cover 23 has multiple vent holes 231 evenly spaced around it. The diameter of the vent holes 231 is smaller than the external size of the zeolite particles. An annular limiting protrusion 232 is provided on the lower outer edge of the limiting cover 23. The lower side of the annular limiting protrusion 232 contacts and engages with the receiving area 221. The annular limiting protrusion 232 prevents the zeolite particles from falling off the edge of the receiving area 221. Multiple gas channels 222 are evenly spaced around the inside of the second cylinder 22, and the upper end of each gas channel 222 communicates with the laying cavity 233. Through the gas channels 222, the following is achieved: To introduce hot air into the laying cavity 233, an annular cavity 213 is provided on the upper side of the first cylinder 21. Sealing rings 29 are provided in the grooves on both the inner and outer sides of the annular cavity 213 to prevent hot air from escaping from the connection between the first cylinder 21 and the second cylinder 22. A heating interface 214 is provided on one side of the outer wall of the first cylinder 21, which is connected to the annular cavity 213. The heating interface 214 is connected to a heating pipe 6 by bolts. The heating pipe 6 passes through the round hole on the corresponding tank 11. Through the heating pipe 6, the waste heat of the RTO is introduced into the annular cavity 213.

[0028] Please refer to the appendix carefully. Figure 2 Appendix Figure 5 Appendix Figure 12 and attached Figure 13 As shown, the pallet 27 is provided with multiple air inlets 271 at equal intervals. The diameter of the air inlets 271 is smaller than the external size of the zeolite particles. Through the air inlets 271, waste is introduced into the placement cavity 211. Two limiting ports 272 are provided on the outer edge of the pallet 27. Each limiting port 272 is slidably connected to a limiting strip 215. The limiting strip 215 is provided on both sides of the inner wall of the placement cavity 211. Through the cooperation between the limiting ports 272 and the limiting strip 215, the pallet 27 can move stably up and down in the placement cavity 211. The bottom of the first cylinder 21 is connected to a support plate 28 by bolts. A bearing 281 is provided in the round hole on the support plate 28, and the inner edge of the bearing 281 cooperates with the lower end of the composite shaft 25. Through the support plate 28 and the bearing 281, the stability of the rotation of the composite shaft 25 is improved. Both tanks 11 are equipped with an air inlet pipe 13 and a first valve 3 on the air inlet pipe 13 at their bottoms. The two air inlet pipes 13 are connected by a first three-way connector 14 via bolts. The first three-way connector 14 is connected by a bolt to an input pipe 15 for transporting waste gas. Both covers 12 are equipped with a second three-way connector 16 at their upper ends. The second three-way connector 16 is equipped with a second valve 4 and a third valve 5 in two directions, respectively. A third three-way connector 17 is provided between the two second three-way connectors 16. The third three-way connector 17 is connected by bolts to an output pipe 18. Through the cooperation of the first valve 3, the second valve 4, the third valve 5, the air inlet pipe 13, the first three-way connector 14, the input pipe 15, the second three-way connector 16, the third three-way connector 17, and the output pipe 18, the two VOCs waste gas filtration devices 1 can operate synchronously, with one performing adsorption and the other performing desorption.

[0029] The present invention has been described by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvement made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, shall be within the protection scope of the present invention.

Claims

1. A VOCs waste gas RTO regenerative thermal combustion treatment system, comprising two VOCs waste gas filtration devices (1), the two VOCs waste gas filtration devices (1) being connected by a pipeline, wherein each VOCs waste gas filtration device (1) comprises a tank (11) and a cover (12), and the tank (11) and the cover (12) are connected by bolts, characterized in that... The tank (11) is equipped with three stacked exhaust gas treatment mechanisms (2). Each exhaust gas treatment mechanism (2) includes a first cylinder (21) and a second cylinder (22). The second cylinder (22) is located above the first cylinder (21). The first cylinder (21) is provided with a placement cavity (211) and a first channel (212), which are connected. The second cylinder (22) is provided with a second channel (223), the lower end of which is connected to the upper end of the first channel (212). The upper side of the second cylinder (22) is provided with a concave receiving area (221) with a frustum structure, which is connected to the second channel (223). The upper end of the second cylinder (22) is connected to the second channel (223). A limiting cover (23) with an inverted frustum structure is bolted to the limiting cover (23). The space between the lower side of the limiting cover (23) and the upper side of the receiving area (221) forms a fan-shaped laying cavity (233). A motor (24) is set in the middle of the limiting cover (23). A composite shaft (25) is set at the output end of the motor (24), and a threaded sleeve (26) is set on the composite shaft (25). The threaded sleeve (26) is bolted to a support plate (27). The support plate (27) slides up and down in the placement cavity (211). The placement cavities (211) of the three waste gas treatment mechanisms (2) are all filled with zeolite particles. With the cooperation of the composite shaft (25) and the support plate (27), the zeolite particles can be moved from the placement cavity (211) to the laying cavity (233).

2. The VOCs waste gas RTO regenerative thermal combustion treatment system according to claim 1, characterized in that, The zeolite particles in the placement chamber (211) of the three waste gas treatment mechanisms (2) are, from bottom to top, the first zeolite particle (7), the second zeolite particle (8), and the third zeolite particle (9), and the pore size of the first zeolite particle (7), the second zeolite particle (8), and the third zeolite particle (9) gradually decreases.

3. The VOCs waste gas RTO regenerative thermal combustion treatment system according to claim 1, characterized in that, The composite shaft (25) includes a helical part (251) and a threaded part (252). The helical part (251) rotates in the space formed by the first channel (212) and the second channel (223). Multiple baffles (253) are evenly spaced on the upper side of the helical part (251) along the helical direction. The threaded part (252) rotates in the placement cavity (211). The threaded part (252) and the threaded sleeve (26) are meshed together.

4. The VOCs waste gas RTO regenerative thermal combustion treatment system according to claim 1, characterized in that, The limiting cover (23) is provided with multiple vent holes (231) at equal intervals around it. The outer edge of the lower side of the limiting cover (23) is provided with an annular limiting protrusion (232). The lower side of the annular limiting protrusion (232) contacts and cooperates with the receiving area (221).

5. The VOCs waste gas RTO regenerative thermal combustion treatment system according to claim 1, characterized in that, The second cylinder (22) is provided with multiple gas channels (222) arranged at equal intervals, and the upper end of each gas channel (222) is connected to the laying cavity (233).

6. The VOCs waste gas RTO regenerative thermal combustion treatment system according to claim 1, characterized in that, The upper side of the first cylinder (21) is provided with an annular cavity (213). A sealing ring (29) is provided in the grooves on both the inner and outer sides of the annular cavity (213). A heating interface (214) is provided on one side of the outer wall of the first cylinder (21). The heating interface (214) is connected to the annular cavity (213). The heating interface (214) is connected to a heating pipe (6) by bolts. The heating pipe (6) passes through the round hole on the corresponding tank (11).

7. The VOCs waste gas RTO regenerative thermal combustion treatment system according to claim 1, characterized in that, The tray (27) is provided with multiple air inlets (271) at equal intervals. The outer edge of the tray (27) is provided with two limiting ports (272). Each limiting port (272) is slidably connected to a limiting strip (215). The limiting strip (215) is provided on both sides of the inner wall of the placement cavity (211).

8. A VOCs waste gas RTO regenerative thermal combustion treatment system according to claim 6, characterized in that, The bottom of the first cylinder (21) is connected to a support plate (28) by bolts. A bearing (281) is provided in the round hole on the support plate (28), and the inner edge of the bearing (281) is engaged with the lower end of the composite shaft (25).

9. A VOCs waste gas RTO regenerative thermal combustion treatment system according to claim 6, characterized in that, Both tanks (11) are provided with an air inlet pipe (13) and a first valve (3) on the air inlet pipe (13) at the bottom, and the two air inlet pipes (13) are connected by bolts to a first three-way connector (14), and the first three-way connector (14) is connected by bolts to an input pipe (15) for transporting waste gas.

10. A VOCs waste gas RTO regenerative thermal combustion treatment system according to claim 1, characterized in that, The upper ends of both covers (12) are provided with second and third connectors (16), and the second and third connectors (16) are provided with a second valve (4) and a third valve (5) in two directions respectively. A third connector (17) is provided between the two second and third connectors (16), and the third connector (17) is connected to an output pipe (18) by bolts.

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