A regenerative thermal oxidation device for VOCs waste gas treatment and its working method

Abstract

This invention discloses a regenerative thermal oxidation device for VOCs waste gas treatment and its operating method. The device includes a working support, on which a circulating furnace is mounted. The circulating furnace includes a support rod, on which an inner heat insulation sleeve, a heat storage cylinder, and an outer heat insulation sleeve are sequentially fitted from the inside out in a coaxial structure. Several inner partition plates are installed on the outer periphery of the inner heat insulation sleeve, and several outer partition plates are installed on the inner periphery of the outer heat insulation sleeve. The outer and inner partition plates correspond one-to-one. A first guide plate and a first partition plate are provided between adjacent inner partition plates, and a second guide plate and a second partition plate are provided between adjacent outer partition plates. The first guide plate and the first partition plate between adjacent inner partition plates are uniformly staggered. The first guide plate and the second partition plate, as well as the first partition plate and the second guide plate, correspond to each other. A waste gas replenishment pipe is provided on one side of the outer heat insulation sleeve, and an internal combustion furnace is provided on the other side, which more efficiently retains heat on the heat storage cylinder and preheats the waste gas.

Description

Technical Field

[0001] This invention relates to the field of waste gas treatment technology, specifically a regenerative thermal oxidation device for VOCs waste gas treatment and its operating method. Background Technology

[0002] RTO (Regenerative Thermal Oxidizer) is a highly efficient method for treating organic waste gas. Its working process consists of two stages: the intake stage and the combustion stage. The organic waste gas enters a heat storage chamber, is preheated, and then enters the combustion chamber. At high temperatures (generally 760℃-850℃), the organic matter in the waste gas is oxidized and decomposed into carbon dioxide and water. The high-temperature gas after combustion enters another heat storage chamber, transferring heat to the heat storage body, causing the heat storage body to heat up. The high-temperature gas itself cools down and is then discharged. By switching the valve, the two heat storage chambers alternately receive gas, and the two stages are continuously alternated and cyclical, achieving the purpose of continuous waste gas treatment.

[0003] Application document CN118935421A discloses an RTO exhaust gas treatment device and its treatment method, including a combustion chamber with two symmetrically arranged interfaces at the bottom for installing ceramic preheating bodies; a Karman vortex street combustion assembly with a horizontally adjustable position is installed in the middle of the combustion chamber to form a Karman vortex street for combustion of exhaust gas; two liftable propulsion components are installed inside the combustion chamber on both sides of the Karman vortex street combustion assembly to push the exhaust gas downwards and send the exhaust gas over the underside of the propulsion components towards the Karman vortex street combustion assembly; two combustion burners are fixedly installed inside the combustion chamber directly above the two interfaces.

[0004] Based on the aforementioned patents and existing technologies, the following questions arise:

[0005] Question 1: Because the switching requires a valve, the heat exchange efficiency is low and the heat loss is high.

[0006] Question 2: Because the shape of the air duct changes abruptly at multiple locations, the heat storage area and heat exchange area are unevenly distributed, which can easily lead to waste gas residue and adhesion.

[0007] Question 3: Because the heat exchange efficiency cannot reach the optimal level, the waste gas treatment efficiency is low, resulting in low work efficiency. Summary of the Invention

[0008] The purpose of this invention is to address the aforementioned problems and deficiencies by providing a regenerative thermal oxidation device for VOCs waste gas treatment, thereby improving overall working efficiency.

[0009] This invention solves at least one of the following technical problems:

[0010] (1) The heat exchange efficiency is low and the heat loss is high;

[0011] (2) The uneven distribution of heat storage and heat exchange areas can easily lead to waste gas residue and adhesion;

[0012] (3) The waste gas treatment efficiency is low and the work efficiency is low.

[0013] The objective of this invention can be achieved through the following technical solution: A regenerative thermal oxidation device for VOCs waste gas treatment includes a working support, on which a circulating furnace is installed. The circulating furnace includes a support rod, on which an inner heat insulation sleeve, a heat storage cylinder, and an outer heat insulation sleeve are sequentially fitted from the inside to the outside in a coaxial structure. Several inner partition plates are installed on the outer periphery of the inner heat insulation sleeve, and several outer partition plates are installed on the inner periphery of the outer heat insulation sleeve. The outer partition plates and inner partition plates correspond one-to-one. A first guide plate and a first partition plate are provided between adjacent inner partition plates, and a second guide plate and a second partition plate are provided between adjacent outer partition plates. The first guide plate and the first partition plate between adjacent inner partition plates are uniformly staggered. The first guide plate and the second partition plate, as well as the first partition plate and the second guide plate, correspond to each other. A waste gas replenishment pipe is provided on one side of the outer heat insulation sleeve, and an internal combustion furnace is provided on the other side. An air inlet pipe is provided on one side of the top of the outer heat insulation sleeve, and a waste heat recovery device is provided on the other side of the top. An igniter is installed on one side of the internal combustion furnace.

[0014] As a further aspect of the invention, the inner partition plate is provided with three sections, and several purge diversion pipes are connected between the air intake pipe and the outer heat insulation sleeve. Several heat storage exhaust pipes are connected between the waste heat recovery unit and the outer heat insulation sleeve. An air pipe head is provided at one end of the air intake pipe. Several pairs of purge exhaust pipes and preheating diversion pipes are connected between the waste gas replenishment pipe and the outer heat insulation sleeve. Several pairs of preheating exhaust pipes and heat storage diversion pipes are connected between the internal combustion furnace and the outer heat insulation sleeve. The outer heat insulation sleeve, waste gas replenishment pipe and internal combustion furnace are all insulated from the outside through the heat insulation layer.

[0015] As a further aspect of the invention, each of the purge branch pipes, purge exhaust pipes, preheat branch pipes, preheat exhaust pipes, heat storage branch pipes, and heat storage exhaust pipes is evenly distributed at equal intervals, and the purge branch pipes and heat storage exhaust pipes, the purge exhaust pipes and preheat branch pipes, and the preheat exhaust pipes and heat storage branch pipes are all symmetrical about the outer partition plate.

[0016] As a further embodiment of the invention, one end of the exhaust gas replenishment pipe is equipped with an exhaust gas pipe head that is easy to connect to the pipe, and several ignition diversion pipes are provided between the igniter and the internal combustion furnace in an equidistant and uniformly distributed manner. The ignition diversion pipes are connected to the side wall of the internal combustion furnace, and a gas port and a spark generator are provided inside the ignition diversion pipes.

[0017] As a further embodiment of the invention, the inner partition plates are evenly distributed at equal angles, a first ring plate is installed at both ends of the inner heat insulation sleeve, a second ring plate is installed at both ends of the heat storage cylinder, and a third ring plate is installed at both ends of the outer heat insulation sleeve. The second ring plate is rotatably connected to the first ring plate and the third ring plate respectively. The first ring plate is fixedly connected to the first guide plate and the first partition plate, and the second ring plate is fixedly connected to the second guide plate and the second partition plate.

[0018] As a further embodiment of the invention, a sealing side plate is installed at one end of the support rod and the other end is fixedly connected to the working bracket. The sealing side plate works in conjunction with the heat insulation layer to provide heat insulation, and the sealing side plate is fixedly connected to the working bracket through the support frame.

[0019] As a further embodiment of the invention, the outer heat insulation sleeve is fixedly connected to the sealing side plate and the working bracket respectively through the third ring plate, the inner heat insulation sleeve is fixedly connected to the sealing side plate and the working bracket respectively through the first ring plate, the heat storage cylinder is slidably connected to the sealing side plate and the working bracket respectively through the second ring plate, and a gear and a motor for driving the second ring plate to rotate are installed on one side of the working bracket.

[0020] As a further aspect of the invention, the waste heat recovery device includes a heat exchange box, in which several first heat exchangers and second heat exchangers are placed. One end of the first heat exchanger is connected to a high-temperature air inlet pipe and the other end is connected to a normal-temperature exhaust pipe. A heat exchange water inlet pipe and an exhaust pipe are provided on one side of the heat exchange box, and a heat exchange drain pipe is provided on the other side. The high-temperature air inlet pipe is connected to the heat storage exhaust pipe, and the normal-temperature exhaust pipe is connected to the exhaust pipe.

[0021] As a further aspect of the invention, both the first heat exchanger and the second heat exchanger have a serpentine tubular structure. The first heat exchanger and the second heat exchanger are evenly and interwoven and tightly connected to each other. One end of the second heat exchanger is connected to an inlet water distribution pipe and the other end is connected to a drain water distribution pipe. The inlet water distribution pipe is connected to the heat exchange inlet water pipe, and the drain water distribution pipe is connected to the heat exchange drain pipe.

[0022] A method for operating a regenerative thermal oxidizer for VOCs waste gas treatment includes the following steps:

[0023] Step 1: Fill the waste heat recovery unit with water, ignite it in the internal combustion furnace, and continuously burn it by introducing external gas as fuel. Introduce fresh air into the air intake pipe, and burn it together with the gas as fuel to form a high-temperature airflow, which stores heat in the heat storage cylinder. This causes the cylinder wall to absorb heat and form a high-temperature section, and the heat storage cylinder is continuously rotated.

[0024] Step 2: When the high-temperature section of the heat storage cylinder moves to the outer heat insulation sleeve corresponding to the exhaust gas replenishment pipe, exhaust gas is introduced into the exhaust gas replenishment pipe, and then the mixture is ignited and fully combusted in the internal combustion furnace;

[0025] Step 3: No more external gas is introduced. The gas flow after the combustion of the mixed gas replaces the gas flow after the combustion of the gas and enters the external heat insulation sleeve again from the internal combustion furnace to exchange heat again and thus store heat.

[0026] Step 4: After heat storage is completed, the exhaust gas is discharged into the high-temperature intake pipe through the heat storage exhaust pipe and enters each of the first heat exchangers for full heat exchange.

[0027] The beneficial effects of this invention are:

[0028] (1) By continuously rotating the heat storage cylinder, the section with the highest temperature in the heat storage section moves to the preheating section, ensuring that the maximum temperature difference between the mixed gas and the heat storage cylinder is maintained and the preheating efficiency is optimal. At the same time, the purging section enriches the waste gas adhering substances at the waste gas replenishment pipe, achieving the best purging effect. This not only completely eliminates the waste gas substances adhering to the heat storage cylinder, but also reduces the temperature of the heat storage cylinder section after purging to the lowest level, fully absorbs the heat after the mixed gas combustion, reduces the loss of heat generated by the mixed gas combustion, and ensures that the heat generated by combustion is more fully used for the preheating of the waste gas mixture.

[0029] (2) By uniformly diverting the air, mixed gas and high-temperature gas flow through the purging diversion pipe, the preheating diversion pipe and the heat storage diversion pipe, the air, mixed gas and high-temperature gas flow are uniformly flowed at all points on the side wall generatrix of the heat storage cylinder and the flow direction is perpendicular to the outer circumferential tangent, so as to achieve uniform and thorough purging, uniform and sufficient preheating and uniform and sufficient heat storage. When the purging is finished, the gas flow is input into the waste gas replenishment pipe through the purging exhaust pipe. At the same time, the attached waste gas substances are mixed into the waste gas replenishment pipe to improve the purging effect. After mixing with the waste gas in the waste gas replenishment pipe, it is input into the outer heat insulation sleeve again through the preheating diversion pipe. By continuously moving the highest temperature section of the heat storage cylinder to the preheating diversion pipe, the best preheating efficiency and preheating effect are ensured. When storing heat, the highest temperature section of the heat storage cylinder is continuously moved away, which is equivalent to extending the heat absorption section, thereby more efficiently leaving heat on the heat storage cylinder and preheating the waste gas, further improving the waste gas treatment efficiency and the amount of full reaction.

[0030] (3) Water is supplied to each of the second heat exchangers through the heat exchange inlet pipe and the inlet diversion pipe, and the water flow direction is opposite to the air flow direction, so as to fully absorb the waste heat of the exhaust gas. After the heat storage is completed, the exhaust gas is discharged into the high temperature inlet pipe through the heat storage exhaust pipe and enters each of the first heat exchangers. The path length is extended by the serpentine structure, the heat exchange time is extended, and full heat exchange is achieved. The gas temperature discharged from the exhaust pipe is consistent with the initial temperature of the water flow, so as to achieve the best waste heat absorption efficiency. Attached Figure Description

[0031] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0032] Figure 1This is a schematic diagram of the overall structure of the present invention;

[0033] Figure 2 This is a side view of the internal structure of the circulating furnace of the present invention;

[0034] Figure 3 This is a side view of the internal structure of the external heat insulation sleeve of the present invention;

[0035] Figure 4 This is a perspective view of the internal structure of the circulating furnace of the present invention;

[0036] Figure 5 for Figure 4 Enlarged view of region A in the middle;

[0037] Figure 6 This is a side view of the internal structure of the heat exchanger box of the present invention;

[0038] Figure 7 This is a schematic diagram of the distribution structure of the first and second heat exchangers of the present invention.

[0039] In the diagram: 101. Working support; 102. Circulating furnace; 103. Exhaust gas supply pipe; 104. Internal combustion furnace; 105. Ignition device; 106. Waste heat recovery unit; 201. Support rod; 202. Inner insulation sleeve; 203. Inner partition plate; 204. First ring plate; 205. First guide plate; 206. First partition plate; 207. Heat storage cylinder; 208. Second ring plate; 209. Outer insulation sleeve; 210. Outer partition plate; 211. Third ring plate; 212. Second guide plate; 213. Second partition plate; 214. Air inlet pipe; 215. Purge diversion pipe; 2 16. Air pipe head; 217. Purge exhaust pipe; 218. Preheating branch pipe; 219. Preheating exhaust pipe; 220. Heat storage branch pipe; 221. Heat storage exhaust pipe; 222. Insulation layer; 223. Exhaust gas pipe head; 224. Support frame; 225. Sealing side plate; 226. Ignition branch pipe; 301. Heat exchange box; 302. First heat exchanger; 303. Second heat exchanger; 304. High temperature air inlet pipe; 305. Normal temperature exhaust pipe; 306. Exhaust pipe; 307. Heat exchange water inlet pipe; 308. Inlet branch pipe; 309. Drainage branch pipe; 310. Heat exchange drain pipe. Detailed Implementation

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

[0041] Please see Figure 1 , 3As shown: A regenerative thermal oxidation device for VOCs waste gas treatment includes a working support 101, a circulating furnace 102 installed on the working support 101, the circulating furnace 102 includes a support rod 201, and an inner heat insulation sleeve 202, a heat storage cylinder 207 and an outer heat insulation sleeve 209 are sequentially sleeved on the support rod 201 from the inside to the outside in a coaxial structure.

[0042] Please see Figure 3 As shown, a plurality of inner partition plates 203 are installed on the outer periphery of the inner heat insulation sleeve 202. In this embodiment, there are three inner partition plates 203 that are evenly distributed at equal angles. A plurality of outer partition plates 210 are installed on the inner periphery of the outer heat insulation sleeve 209. The outer partition plates 210 and the inner partition plates 203 correspond one-to-one. A first guide plate 205 and a first partition plate 206 are provided between adjacent inner partition plates 203. A second guide plate 212 and a second partition plate 213 are provided between adjacent outer partition plates 210. The first guide plate 205 and the first partition plate 206 between adjacent inner partition plates 203 are evenly staggered. The first guide plate 205 and the second partition plate 213, as well as the first partition plate 206 and the second guide plate 212, correspond to each other.

[0043] Please see Figure 2 , 3 As shown, an exhaust gas supply pipe 103 is provided on one side of the external heat insulation sleeve 209 and an internal combustion furnace 104 is provided on the other side. An air intake pipe 214 is provided on one side of the top of the external heat insulation sleeve 209 and a waste heat recovery device 106 is provided on the other side of the top. An igniter 105 is installed on one side of the internal combustion furnace 104. An exhaust gas pipe head 223 is installed at one end of the exhaust gas supply pipe 103 for easy connection. Several ignition diversion pipes 226 are provided between the igniter 105 and the internal combustion furnace 104 in an equidistant and uniformly distributed manner. The ignition diversion pipes 226 are connected to the side wall of the internal combustion furnace 104. A gas port and a spark generator are provided in the ignition diversion pipes 226.

[0044] Please see Figure 2-4As shown, several purge and diversion pipes 215 connect the air intake pipe 214 and the outer heat insulation sleeve 209; several heat storage exhaust pipes 221 connect the waste heat recovery unit 106 and the outer heat insulation sleeve 209; one end of the air intake pipe 214 is equipped with an air pipe head 216; several pairs of purge and diversion pipes 217 and preheating diversion pipes 218 connect the waste gas replenishment pipe 103 and the outer heat insulation sleeve 209; several pairs of preheating exhaust pipes 219 and heat storage diversion pipes 220 connect the internal combustion furnace 104 and the outer heat insulation sleeve 209. Each purge diversion pipe 215, purge exhaust pipe 217, preheating diversion pipe 218, preheating exhaust pipe 219, heat storage diversion pipe 220, and heat storage exhaust pipe 221 are evenly distributed at equal intervals. The external heat insulation sleeve 209, the waste gas replenishment pipe 103, and the internal combustion furnace 104 are all insulated from the outside through the heat insulation layer 222. The purge diversion pipe 215 and the heat storage exhaust pipe 221, the purge exhaust pipe 217 and the preheating diversion pipe 218, and the preheating exhaust pipe 219 and the heat storage diversion pipe 220 are all symmetrical about the external partition plate 210.

[0045] Please see Figure 1 , 2 As shown, both ends of the inner heat insulation sleeve 202 are equipped with first ring plates 204, both ends of the heat storage cylinder 207 are equipped with second ring plates 208, and both ends of the outer heat insulation sleeve 209 are equipped with third ring plates 211. The second ring plates 208 are rotatably connected to both the first ring plates 204 and the third ring plates 211. The first ring plates 204 are fixedly connected to the first guide plate 205 and the first partition plate 206. The second ring plates 208 are fixedly connected to the second guide plate 212 and the second partition plate 213. One end of the support rod 201 is equipped with a sealing side plate 225, and the other end is fixedly connected to the working bracket 101. The outer heat insulation sleeve 209 is fixedly connected to the sealing side plate 225 and the working bracket 101 respectively through the third ring plate 211. The inner heat insulation sleeve 202 is fixedly connected to the sealing side plate 225 and the working bracket 101 respectively through the first ring plate 204. The heat storage cylinder 207 is slidably connected to the sealing side plate 225 and the working bracket 101 respectively through the second ring plate 208. A gear and motor for driving the second ring plate 208 to rotate are installed on one side of the working bracket 101. The sealing side plate 225 works together with the heat insulation layer 222 to provide heat insulation. The sealing side plate 225 is fixedly connected to the working bracket 101 through the support frame 224.

[0046] Please see Figure 1 , 3As shown, during operation of this embodiment, the honeycomb-shaped through-hole slots on the heat storage cylinder 207 are uniformly arranged along the radius of the annular cross section, and the heat storage cylinder 207 rotates intermittently and cyclically when driven. The rotation direction of the heat storage cylinder 207 is opposite to the movement direction of the airflow in the circulating furnace 102. In this embodiment, the airflow generally moves in a counterclockwise direction, and the heat storage cylinder 207 rotates at a constant speed in a clockwise direction.

[0047] Please see Figure 1 , 3 As shown, during operation, the overall process is divided into a start-up stage and a working stage. The section of the heat storage cylinder 207 between the air intake pipe 214 and the exhaust gas replenishment pipe 103 is the purging stage; the section of the heat storage cylinder 207 between the exhaust gas replenishment pipe 103 and the internal combustion furnace 104 is the preheating stage; and the section of the heat storage cylinder 207 between the internal combustion furnace 104 and the heat storage exhaust pipe 221 is the heat storage stage.

[0048] Please see Figure 1 , 3 As shown, during the start-up phase, ignition is simultaneously achieved in the internal combustion furnace 104 via igniter 105 and various ignition diversion pipes 226. Externally supplied gas is used as fuel for continuous combustion. Simultaneously, fresh air is introduced into the air intake pipe 214 via air pipe head 216, and then sent into the outer heat insulation sleeve 209 through purge diversion pipe 215. The airflow is directed towards the exhaust gas replenishment pipe 103 by the obstruction of the inner and outer partition plates 203 and the pressure of the transport. Subsequently, the airflow re-enters the outer heat insulation sleeve 209 from the exhaust gas replenishment pipe 103, again being directed towards the internal combustion furnace by the obstruction of the inner and outer partition plates 203 and the pressure of the transport. The furnace 104 delivers airflow, which, together with the gas, is fully combusted as fuel to form a high-temperature airflow. The high-temperature airflow re-enters the outer heat insulation sleeve 209 from the internal combustion furnace 104, and is again conveyed to the heat storage exhaust pipe 221 through the obstruction of the inner partition plate 203 and the outer partition plate 210 and the conveying pressure, thereby storing heat in the heat storage cylinder 207. This causes the cylinder wall of the heat storage cylinder 207 to absorb heat and form a high-temperature section. As the heat storage cylinder 207 rotates continuously, the high-temperature section gradually extends and moves towards the exhaust gas supply pipe 103. When the high-temperature section of the heat storage cylinder 207 moves to the outer heat insulation sleeve 209 corresponding to the exhaust gas supply pipe 103, exhaust gas is input into the exhaust gas supply pipe 103, and the working stage begins.

[0049] Please see Figure 3-5As shown, during the working phase, the mixture of exhaust gas and air undergoes heat exchange through the high-temperature section of the heat storage cylinder 207, causing the mixture to be heated to a high temperature before reaching the internal combustion furnace 104. Subsequently, the mixture is ignited and fully combusted in the internal combustion furnace 104, while no external combustion gas is introduced. Only the mixture is used as fuel for combustion. The gas flow after the mixture combustion replaces the gas flow after the combustion of the combustion gas and re-enters the external heat insulation sleeve 209 from the internal combustion furnace 104 for heat exchange again, thereby storing heat. The gas flow after heat storage is completed is discharged into the waste heat recovery device 106 through the heat storage exhaust pipe 221. The waste heat recovery device 106 collects heat again, ensuring that the exhaust gas is fully preheated before combustion, ensuring the adequacy of exhaust gas treatment, that is, ensuring that each exhaust gas molecule is in a fully reactive condition.

[0050] Please see Figure 3-5 As shown, by continuously rotating the heat storage cylinder 207, the section with the highest temperature in the heat storage section continuously moves towards the preheating section, ensuring that the maximum temperature difference between the mixed gas and the heat storage cylinder 207 is maintained and the preheating efficiency is optimized. At the same time, the purging section concentrates the waste gas adhering substances purged out at the waste gas replenishment pipe 103, achieving the best purging effect. This not only completely eliminates the waste gas substances adhering to the heat storage cylinder 207, but also reduces the temperature of the sections of the heat storage cylinder 207 after purging to the lowest level, fully absorbing the heat after the combustion of the mixed gas, reducing the loss of heat generated by the combustion of the mixed gas, and ensuring that the heat generated by the combustion is more fully used for the preheating of the waste gas mixture.

[0051] Please see Figure 3-5 As shown, the uniform flow of air, mixed gas, and high-temperature gas through the purging diversion pipe 215, preheating diversion pipe 218, and heat storage diversion pipe 220 ensures uniform flow of air, mixed gas, and high-temperature gas at all points along the sidewall generatrix of the heat storage cylinder 207, with the flow direction perpendicular to the outer circumferential tangent. This facilitates uniform and thorough purging, uniform and sufficient preheating, and uniform and sufficient heat storage. At the end of purging, the gas flow enters the exhaust gas replenishment pipe 103 through the purging exhaust pipe 217, and the attached exhaust gas substances are also mixed into the exhaust gas replenishment pipe 103, improving the purging efficiency. After mixing with the exhaust gas in the exhaust gas replenishment pipe 103, the mixture is then reintroduced into the outer heat insulation sleeve 209 through the preheating diversion pipe 218. By continuously moving the highest temperature section of the heat storage cylinder 207 toward the preheating diversion pipe 218, the optimal preheating efficiency and effect are ensured. During heat storage, the highest temperature section of the heat storage cylinder 207 is continuously moved away, which is equivalent to extending the heat absorption section. This allows the heat to be retained on the heat storage cylinder 207 more efficiently and preheated to heat the exhaust gas, further improving the exhaust gas treatment efficiency and the amount of fully reacted.

[0052] Please see Figure 3-5As shown, the first guide plate 205, the first partition plate 206, the second guide plate 212 and the second partition plate 213 greatly increase the number of times the airflow passes through the slots of the heat storage cylinder 207, ensuring the process time for purging, preheating and heat storage, thereby improving the treatment efficiency and overall heat exchange efficiency, reducing the amount of incomplete reaction of the waste gas and the heat loss caused by untimely heat exchange, and improving the overall working efficiency.

[0053] Please see Figure 1 , 6 As shown, the waste heat recovery unit 106 includes a heat exchange box 301, inside which are placed several first heat exchangers 302 and second heat exchangers 303. Both the first heat exchangers 302 and second heat exchangers 303 have a serpentine tubular structure. The first heat exchangers 302 and second heat exchangers 303 are evenly and interwoven and tightly connected to each other. One end of each first heat exchanger 302 is connected to a high-temperature inlet pipe 304, and the other end is connected to a normal-temperature exhaust pipe 305. The heat exchange box 301... 1 has a heat exchange water inlet pipe 307 and a flue 306 on one side and a heat exchange drain pipe 310 on the other side. The high temperature air inlet pipe 304 is connected to the heat storage exhaust pipe 221, and the normal temperature exhaust pipe 305 is connected to the flue 306. One end of the second heat exchanger 303 is connected to the water inlet pipe 308 and the other end is connected to the drain pipe 309. The water inlet pipe 308 is connected to the heat exchange water inlet pipe 307, and the drain pipe 309 is connected to the heat exchange drain pipe 310.

[0054] Please see Figure 6 , 7 As shown, in this embodiment, water is first supplied to each of the second heat exchangers 303 through the heat exchange water inlet pipe 307 and the inlet water diversion pipe 308, and the water flow direction is opposite to the air flow direction, so as to fully absorb the waste heat of the exhaust gas. After the heat storage is completed, the exhaust gas is discharged into the high temperature air inlet pipe 304 through the heat storage exhaust pipe 221 and enters each of the first heat exchangers 302. The serpentine structure extends the path length and extends the heat exchange time, so as to achieve full heat exchange and make the gas temperature discharged from the exhaust pipe 306 consistent with the initial temperature of the water flow, thus achieving the best waste heat absorption efficiency.

[0055] Please see Figure 1-7 As shown, the working method of this regenerative thermal oxidizer for VOCs waste gas treatment includes the following steps:

[0056] Step 1: Ensure the waste heat recovery unit 106 is filled with low-temperature water. Then, ignite the internal combustion furnace 104 simultaneously via igniter 105 and each ignition branch pipe 226. Continuous combustion is achieved using externally connected gas as fuel. Simultaneously, fresh air is introduced into the air intake pipe 214 via air pipe head 216, and then sent into the outer insulation sleeve 209 via purge branch pipe 215. The airflow is directed towards the waste gas replenishment pipe 103 by the obstruction of the inner and outer partition plates 203 and the pressure of the transport. The airflow then flows from the waste gas replenishment pipe 103... 03. The gas flows back into the outer heat insulation sleeve 209 and is again transported to the internal combustion furnace 104 through the obstruction of the inner partition plate 203 and the outer partition plate 210 and the pressure of the transport. It is fully combusted with the gas as fuel to form a high-temperature gas flow. The high-temperature gas flow enters the outer heat insulation sleeve 209 from the internal combustion furnace 104 again and is transported to the heat storage exhaust pipe 221 through the obstruction of the inner partition plate 203 and the outer partition plate 210 and the pressure of the transport, thereby storing heat in the heat storage cylinder 207. The cylinder wall of the heat storage cylinder 207 absorbs heat and forms a high-temperature section, and the heat storage cylinder 207 rotates continuously.

[0057] Step 2: As the heat storage cylinder 207 rotates continuously, the high-temperature section gradually extends and moves toward the exhaust gas supply pipe 103. When the high-temperature section of the heat storage cylinder 207 moves to the outer heat insulation sleeve 209 corresponding to the exhaust gas supply pipe 103, exhaust gas is input into the exhaust gas supply pipe 103. The mixture of exhaust gas and air undergoes heat exchange through the high-temperature section of the heat storage cylinder 207, so that the mixture is heated to a high-temperature state before reaching the internal combustion furnace 104. Subsequently, the mixture is ignited and fully combusted in the internal combustion furnace 104.

[0058] Step 3: No more external gas is introduced. Only the mixed gas is used as fuel for combustion. The gas flow after the mixed gas combustion replaces the gas flow after the gas combustion and enters the external heat insulation sleeve 209 from the internal combustion furnace 104 again for heat exchange and heat storage. The gas flow after heat storage is completed is discharged into the waste heat recovery unit 106 through the heat storage exhaust pipe 221.

[0059] Step 4: Water is supplied to each of the second heat exchangers 303 through the heat exchange inlet water pipe 307 and the inlet diversion pipe 308, and the water flow direction is opposite to the air flow direction. After heat storage is completed, the exhaust gas is discharged into the high temperature air inlet pipe 304 through the heat storage exhaust pipe 221 and enters each of the first heat exchangers 302 for full heat exchange, so that the gas temperature discharged from the exhaust pipe 306 is consistent with the initial temperature of the water flow.

[0060] When using this invention, the operator continuously rotates the heat storage cylinder 207, causing the section with the highest temperature in the heat storage section to continuously move towards the preheating section. This ensures that the maximum temperature difference between the mixed gas and the heat storage cylinder 207 is maintained, and the preheating efficiency is optimized. At the same time, the purging section concentrates the waste gas adhering substances purged from the gas at the waste gas replenishment pipe 103, achieving the best purging effect. This not only completely eliminates the waste gas substances adhering to the heat storage cylinder 207, but also reduces the temperature of the sections of the heat storage cylinder 207 after purging to the lowest level, fully absorbing the heat after the combustion of the mixed gas, reducing the loss of heat generated by the combustion of the mixed gas, and ensuring that the heat generated by the combustion is more fully used for the preheating of the waste gas mixture.

[0061] By uniformly diverting air through the purging diversion pipe 215, the preheating diversion pipe 218, and the heat storage diversion pipe 220, air, mixed gas, and high-temperature gas flow uniformly at all points along the sidewall generatrix of the heat storage cylinder 207, with the flow direction perpendicular to the outer circumferential tangent. This facilitates uniform and thorough purging, uniform and sufficient preheating, and uniform and sufficient heat storage. At the end of purging, the gas flow enters the exhaust gas replenishment pipe 103 through the purging exhaust pipe 217, and the attached exhaust gas substances are also mixed into the exhaust gas replenishment pipe 103, improving the purging effect. After mixing with the exhaust gas in the exhaust gas replenishment pipe 103, it is reintroduced into the outer heat insulation sleeve 209 through the preheating diversion pipe 218. By continuously moving the highest temperature section of the heat storage cylinder 207 towards the preheating diversion pipe 218, the best preheating efficiency and preheating effect are ensured. During heat storage, the highest temperature section of the heat storage cylinder 207 is continuously moved away, which is equivalent to extending the heat absorption section, thereby more efficiently retaining heat on the heat storage cylinder 207 and preheating the exhaust gas, further improving the treatment efficiency of the exhaust gas and the amount of full reaction.

[0062] Water is supplied to each of the second heat exchangers 303 through the heat exchange inlet pipe 307 and the inlet diversion pipe 308, with the water flow direction opposite to the air flow direction, thereby fully absorbing the waste heat of the exhaust gas. After heat storage is completed, the exhaust gas is discharged into the high-temperature air inlet pipe 304 through the heat storage exhaust pipe 221 and enters each of the first heat exchangers 302. The serpentine structure extends the path length and extends the heat exchange time, achieving full heat exchange and ensuring that the gas temperature discharged from the exhaust pipe 306 is consistent with the initial temperature of the water flow, thus achieving the best waste heat absorption efficiency.

[0063] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A regenerative thermal oxidation device for VOCs waste gas treatment, characterized in that, The utility model provides a circulating furnace, which comprises a working support (101), a circulating furnace (102) is installed on the working support (101), the circulating furnace (102) comprises a support rod (201), an inner heat insulation sleeve (202), a heat storage cylinder (207) and an outer heat insulation sleeve (209) are sequentially sleeved in a coaxial structure from inside to outside on the support rod (201), a plurality of inner partition plates (203) are installed on the outer periphery of the inner heat insulation sleeve (202), a plurality of outer partition plates (210) are installed on the inner periphery of the outer heat insulation sleeve (209), the outer partition plates (210) and the inner partition plates (203) are in one-to-one correspondence, first guide plates (205) and first partition plates (206) are arranged between adjacent inner partition plates (203), second guide plates (212) and second partition plates (213) are arranged between adjacent outer partition plates (210), a waste gas supplement pipe (103) is arranged on one side of the outer heat insulation sleeve (209) and an internal combustion furnace (104) is arranged on the other side, an air inlet pipe (214) is arranged on one side of the top of the outer heat insulation sleeve (209) and a waste heat recovery device (106) is arranged on the other side of the top of the outer heat insulation sleeve (209). The first guide plates (205) and the first partition plates (206) between adjacent inner partition plates (203) are uniformly staggered, the first guide plates (205) and the second partition plates (213) and the first partition plates (206) and the second guide plates (212) correspond to each other, the inner partition plates (203) are provided in three, a plurality of purge shunt pipes (215) are connected between the air inlet pipe (214) and the outer heat insulation sleeve (209), a plurality of heat storage exhaust pipes (221) are connected between the waste heat recovery device (106) and the outer heat insulation sleeve (209), an air pipe head (216) is arranged at one end of the air inlet pipe (214), a plurality of pairs of purge exhaust pipes (217) and preheating shunt pipes (218) are connected between the waste gas supplement pipe (103) and the outer heat insulation sleeve (209), a plurality of pairs of preheating exhaust pipes (219) and heat storage shunt pipes (220) are connected between the internal combustion furnace (104) and the outer heat insulation sleeve (209), the outer heat insulation sleeve (209), the waste gas supplement pipe (103) and the internal combustion furnace (104) are all insulated from the outside through a heat insulation layer (222), and a lighter (105) is installed on one side of the internal combustion furnace (104). The purge shunt pipes (215), the purge exhaust pipes (217), the preheating shunt pipes (218), the preheating exhaust pipes (219), the heat storage shunt pipes (220) and the heat storage exhaust pipes (221) are all uniformly distributed at equal intervals, and the purge shunt pipes (215) and the heat storage exhaust pipes (221), the purge exhaust pipes (217) and the preheating shunt pipes (218) and the preheating exhaust pipes (219) and the heat storage shunt pipes (220) are all symmetric about the outer partition plates (210).

2. The heat regenerative oxidizer for treating VOC exhaust gas according to claim 1, characterized by One end of the exhaust gas supplement pipe (103) is provided with an exhaust gas pipe head (223) facilitating pipe connection, a plurality of ignition shunt pipes (226) are evenly distributed at equal angles between the igniter (105) and the internal combustion furnace (104), the ignition shunt pipes (226) are communicated with the side wall of the internal combustion furnace (104), and the ignition shunt pipes (226) are provided with gas ports and spark generators.

3. The heat regenerative oxidizer for treating VOC exhaust gas according to claim 1, characterized by The inner partition plates (203) are evenly distributed at equal angles, the two ends of the inner heat insulation sleeve (202) are provided with first ring plates (204), the two ends of the heat storage cylinder (207) are provided with second ring plates (208), and the two ends of the outer heat insulation sleeve (209) are provided with third ring plates (211). The second ring plates (208) are rotationally connected with the first ring plates (204) and the third ring plates (211) respectively, the first ring plates (204) are fixedly connected with the first guide plates (205) and the first partition plates (206), and the second ring plates (208) are fixedly connected with the second guide plates (212) and the second partition plates (213).

4. The heat regenerative oxidizer for treating VOC exhaust gas according to claim 3, characterized by One end of the support rod (201) is provided with a sealing side plate (225), and the other end is fixedly connected with the working support (101). The sealing side plate (225) and the heat insulation layer (222) are used for heat insulation together, and the sealing side plate (225) is fixedly connected with the working support (101) through the support frame (224).

5. The heat regenerative oxidizer for treating VOC exhaust gas according to claim 4, characterized by The outer heat insulation sleeve (209) is fixedly connected with the sealing side plate (225) and the working support (101) through the third ring plates (211), the inner heat insulation sleeve (202) is fixedly connected with the sealing side plate (225) and the working support (101) through the first ring plates (204), the heat storage cylinder (207) is slidingly connected with the sealing side plate (225) and the working support (101) through the second ring plates (208), and one side of the working support (101) is provided with a gear and a motor for driving the second ring plates (208) to rotate.

6. The heat regenerative oxidizer for VOC exhaust treatment according to claim 1, characterized by The waste heat recovery device (106) comprises a heat exchange box (301), a plurality of first heat exchangers (302) and second heat exchangers (303) are arranged in the heat exchange box (301), one end of the first heat exchanger (302) is communicated with a high-temperature air inlet pipe (304) and the other end is communicated with a normal-temperature air outlet pipe (305), one side of the heat exchange box (301) is provided with a heat exchange water inlet pipe (307) and a smoke exhaust funnel (306), and the other side is provided with a heat exchange water outlet pipe (310), the high-temperature air inlet pipe (304) is communicated with the heat storage air outlet pipe (221), and the normal-temperature air outlet pipe (305) is communicated with the smoke exhaust funnel (306).

7. The heat regenerative oxidizer for treating VOC exhaust gas according to claim 6, characterized by The first heat exchanger (302) and the second heat exchanger (303) are in a serpentine pipe structure, each first heat exchanger (302) and second heat exchanger (303) are uniformly and staggered distributed and closely connected with each other, one end of the second heat exchanger (303) is communicated with a water inlet shunt pipe (308) and the other end is communicated with a water outlet shunt pipe (309), the water inlet shunt pipe (308) is communicated with the heat exchange water inlet pipe (307), and the water outlet shunt pipe (309) is communicated with the heat exchange water outlet pipe (310).

8. The working method of the regenerative oxidation device for VOCs exhaust gas treatment, applied to the regenerative oxidation device for VOCs exhaust gas treatment according to claim 7, characterized in that, Comprising the following steps: Step one: water is filled into the waste heat recovery device (106), the internal combustion furnace (104) is ignited, external gas is introduced as fuel for continuous combustion, fresh air is introduced into the air inlet pipe (214) to fully combust with the gas to form a high-temperature gas flow, the regenerator (207) is heat stored, the cylinder wall of the regenerator (207) absorbs heat and forms a high-temperature section, and the regenerator (207) is continuously rotated; Step two: when the high-temperature section of the regenerator (207) moves to the corresponding outer heat insulation sleeve pipe (209) of the exhaust gas supplement pipe (103), the exhaust gas is input into the exhaust gas supplement pipe (103), and then the mixed gas is combusted in the internal combustion furnace (104) and fully combusted; Step three: no external gas is introduced, and the gas flow after the combustion of the mixed gas replaces the gas flow after the combustion of the gas to enter the outer heat insulation sleeve pipe (209) from the internal combustion furnace (104) again and exchange heat again to store heat; Step four: the exhaust gas after heat storage is discharged into the high-temperature inlet pipe (304) through the heat storage exhaust pipe (221) and enters each first heat exchanger (302) to fully exchange heat.

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