A lithium battery production waste gas recovery device

Abstract

This application relates to the field of lithium battery production waste gas treatment technology, and discloses a lithium battery production waste gas recovery device, including a gas collection hood. The gas collection hood is installed above the equipment in the lithium battery production workshop. A bag filter is connected to the other end of the gas collection hood, and the bag filter is connected to the outlet of the gas collection hood. The outlet of the bag filter is connected to a waste gas treatment unit. The waste gas treatment unit includes a two-stage spray tower and a spray liquid circulation mechanism. The two-stage spray mechanism includes a spray tower with two sets of filling material layers inside. A spray mechanism is installed above each filling material layer for spraying spray liquid onto the filling material layer. The outlet of the waste gas treatment unit is connected to a regenerative thermal oxidizer. Through a four-stage series treatment system of gas collection, dust removal, spray purification, and oxidation treatment, the waste gas generated during lithium battery production can be effectively treated, avoiding direct discharge of waste gas and environmental pollution.

Description

Technical Field

[0001] This application relates to the field of lithium battery production waste gas treatment technology, specifically to a lithium battery production waste gas recovery device. Background Technology

[0002] With the rapid growth in demand for new energy vehicles and energy storage, my country's lithium battery industry, especially the power lithium battery industry, has entered a period of rapid development. However, the lithium battery production process generates a large amount of waste gas pollutants, such as dust generated during the transfer of positive and negative electrode active materials, NMP solvent waste gas generated when the coating machine dries the positive electrode sheet, and organic waste gas from the electrolyte. If these waste gases are discharged directly into the atmosphere without treatment, they will not only be harmful to human health but also seriously pollute the atmospheric environment.

[0003] Currently, the main technologies for treating waste gas from lithium battery production include physical and chemical methods. However, these technologies all have certain limitations in practical applications. Cyclone dust removal technology, a physical method, can only effectively remove larger dust particles, making it difficult to meet increasingly stringent environmental emission standards. While activated carbon adsorption technology, a chemical method, can adsorb VOCs to some extent, it suffers from limited adsorption capacity, requires frequent adsorbent replacement, and is difficult to dispose of after adsorption saturation, easily causing secondary pollution. Utility Model Content

[0004] To address the shortcomings of existing technologies, this application provides a lithium battery production waste gas recovery device.

[0005] To solve the above problems, this application provides the following technical solution: a lithium battery production waste gas recovery device, including a gas collection hood, which is installed above the equipment in the lithium battery production workshop and is used to extract the waste gas generated during the operation of the equipment. The other end of the gas collection hood is connected to a bag filter, which is connected to the outlet end of the gas collection hood and is used to remove electrode material dust in the production waste gas. The outlet end of the bag filter is connected to a waste gas treatment unit. The waste gas treatment unit includes a two-stage spraying mechanism and a spray liquid circulation mechanism. The two-stage spraying mechanism includes a spraying tower. The spraying tower has two sets of packing layers inside. A spraying mechanism is provided above each packing layer for spraying spray liquid onto the packing layer. The exhaust end of the waste gas treatment unit is connected to a regenerative oxidizer. The bag filter, waste gas treatment unit, and regenerative thermal oxidizer are connected in series to form a continuous treatment channel for treating the waste gas generated during lithium battery production. Preferably, the gas collecting hood and the bag filter are connected by a gas collecting pipe, and the gas collecting pipe is connected to the gas collecting hood and the bag filter by a flange, wherein the bag filter is a DMC bag pulse dust collector. A first fan is provided between the bag filter and the exhaust gas treatment unit. The air inlet of the first fan is connected to the air outlet of the bag filter through an air outlet connecting pipe, and the air outlet of the first fan is connected to the air inlet of the exhaust gas treatment unit through an air inlet connecting pipe.

[0006] Preferably, the two sets of filler layers include a first filler layer and a second filler layer, wherein the first filler layer is a CPVC stepped ring filler layer and the second filler layer is a PP Heil ring filler layer; The top of the spray tower is provided with a dehumidifying packing layer, which is an alumina packing layer. Two observation windows are provided on the front side of the spray tower for observing the interior of the spray tower or for maintenance.

[0007] Preferably, the spraying mechanism includes a spray pipe and a spray head. The spray pipe is connected to a spray liquid circulation mechanism, and the spray head is installed at the end of the spray pipe. The spray pipe is located above the first packing layer or the second packing layer.

[0008] Preferably, the spray liquid circulation mechanism includes a sedimentation tank located at the bottom of the spray tower and connected to the interior of the spray tower. The sedimentation tank is equipped with two sets of partitioning mechanisms, which are used to divide the interior of the sedimentation tank into three sedimentation zones for sedimentation and filtration of the sprayed solution.

[0009] Preferably, the separation mechanism includes a partition and a baffle. The partition is fixedly installed at the bottom of the sedimentation tank, and the baffle is installed at the top of the sedimentation tank. The partition and the baffle are staggered. The baffle is located on the side closer to the inside of the spray tower and is used for three-stage sedimentation of the solution inside the sedimentation tank.

[0010] Preferably, the bottom of the three sedimentation zones is arranged in a "V" shape, and each sedimentation zone is provided with a drain valve at the bottom. The three drain valves are connected by a drain pipe, which is inclined downward.

[0011] Preferably, the sedimentation tank is equipped with a circulation pump, the inlet of the circulation pump is connected to the inside of the sedimentation tank through a pumping pipe, and the outlet of the circulation pump is connected to the spraying mechanism through an outlet pipe.

[0012] Preferably, a liquid extraction tank is provided on one side of the sedimentation tank, a filter screen is provided in the connection between the liquid extraction tank and the interior of the sedimentation tank, the water extraction pipe is located inside the liquid extraction tank, a liquid level sensor is provided inside the liquid extraction tank to monitor the liquid level height inside the liquid extraction tank, and a liquid inlet is provided on one side of the sedimentation tank to add spray solution into the sedimentation tank.

[0013] Preferably, the air inlet of the regenerative oxidizer is connected to the air outlet at the top of the spray tower via an air inlet pipe, and the air outlet of the regenerative oxidizer is connected to a second fan via an air outlet pipe, and the air outlet of the second fan is connected to a chimney.

[0014] Compared with the prior art, this application provides a lithium battery production waste gas recovery device, which has the following beneficial effects: This lithium battery production waste gas recovery device uses a four-stage series treatment system of gas collection, dust removal, spray purification, and oxidation treatment to effectively treat the waste gas generated during the lithium battery production process and prevent the waste gas from being directly discharged and causing environmental pollution.

[0015] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0016] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the structure of a lithium battery production waste gas recovery device according to this application; Figure 2 This is a schematic diagram of the structure of the exhaust gas treatment unit of this application; Figure 3 This is a structural schematic diagram of the cross-section of the exhaust gas treatment unit of this application; Figure 4 For this application Figure 3 Enlarged structural diagram at point A in the middle.

[0017] Reference numerals: 100, Gas collection hood; 200, Baghouse dust collector; 201, Gas collection pipe; 300, First fan; 301, Inlet connecting pipe; 302, Outlet connecting pipe; 400, Waste gas treatment unit; 401, Spray tower; 402, First packing layer; 403, Second packing layer; 404, Dehumidifying packing layer; 405, Observation window; 410, Sedimentation tank; 411, Liquid inlet; 412 413. Drain valve; 414. Drain pipe; 415. Baffle; 416. Liquid extraction tank; 417. Filter screen; 418. Liquid level sensor; 420. Circulation pump; 421. Water extraction pipe; 422. Water outlet pipe; 423. Spray pipe; 424. Spray head; 500. Regenerative oxidizer; 501. Air inlet pipe; 502. Air outlet pipe; 600. Second fan; 700. Chimney. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0020] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0021] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0022] Please see Figures 1-4 This application provides a new technical solution: a lithium battery production waste gas recovery device, including a gas collection hood 100, which is installed above the equipment in the lithium battery production workshop and is used to extract waste gas generated during equipment operation. The other end of the gas collection hood 100 is connected to a bag filter 200, which is connected to the outlet end of the gas collection hood 100 and is used to remove electrode material dust in the production waste gas. The outlet end of the bag filter 200 is connected to a waste gas treatment unit 400. The waste gas treatment unit 400 includes a secondary spraying mechanism and a spray liquid circulation mechanism. The secondary spraying mechanism includes a spray tower 401. The spray tower 401 has two sets of packing layers inside. A spraying mechanism is provided above each packing layer for spraying spray liquid onto the packing layer. The exhaust end of the waste gas treatment unit 400 is connected to a regenerative oxidizer 500. The bag filter 200, the waste gas treatment unit 400, and the regenerative thermal oxidizer 500 are connected in series to form a continuous treatment channel for treating the waste gas generated during lithium battery production.

[0023] In use, the gas collection hood 100 is installed above the equipment in the lithium battery production workshop. Utilizing the suction force generated by a fan, it extracts the waste gas generated during equipment operation based on the principle of negative pressure extraction. The waste gas enters the bag filter 200 through the gas collection pipe 201. Inside the bag filter 200, as the dust-laden gas passes through the filter bags, electrode material dust is intercepted on the surface of the bags. The purified gas then enters the waste gas treatment unit 400. In the spray tower 401 of the waste gas treatment unit 400, the waste gas flows from bottom to top. The spraying mechanism sprays the spraying liquid, delivered by the spraying liquid circulation mechanism, onto the packing layer. The waste gas and the spraying liquid come into full contact at the packing layer, dissolving or reacting the harmful components in the waste gas, thus completing the purification. Afterward, the waste gas enters the regenerative thermal oxidizer 500, where the harmful gases in the waste gas are decomposed at high temperatures.

[0024] In some embodiments, the gas collecting hood 100 and the bag filter 200 are connected by a gas collecting pipe 201. The gas collecting pipe 201 is connected to the gas collecting hood 100 and the bag filter 200 by a flange for easy installation and disassembly. The bag filter 200 is a DMC bag pulse dust collector. After the dust-laden gas enters, larger dust particles fall into the ash hopper due to inertia, while smaller dust particles are collected and retained on the outside of the filter bags through screening, inertia, adhesion, diffusion, and electrostatic effects. The purified gas enters the bag and is collected in the clean air chamber before being discharged. When the dust on the outer surface of the filter bags increases and the equipment resistance rises to a set value, the pulse valve opens, and compressed air is injected from the air tank through the pulse valve and nozzles on the blowpipe into each filter bag, causing the filter bags to expand and generate acceleration and reverse airflow, shaking off the dust attached to the outer surface of the filter bags.

[0025] In this embodiment, a first fan 300 is provided between the bag filter 200 and the exhaust gas treatment unit 400. The inlet of the first fan 300 is connected to the outlet of the bag filter 200 through an outlet connecting pipe 302, and the outlet of the first fan 300 is connected to the inlet of the exhaust gas treatment unit 400 through an inlet connecting pipe 301. The first fan 300 ensures that the exhaust gas can enter each treatment unit sequentially according to a predetermined path, ensuring the continuity of the exhaust gas treatment process.

[0026] In some embodiments, the two sets of packing layers include a first packing layer 402 and a second packing layer 403. The first packing layer 402 is a CPVC stepped ring packing layer, and the second packing layer 403 is a PP Haier ring packing layer. The CPVC stepped ring packing has excellent corrosion resistance and good mass transfer performance, while the PP Haier ring packing has a large specific surface area and porosity. The two work synergistically to enhance the purification capacity.

[0027] In this embodiment, a dehumidifying packing layer 404 is provided at the top of the spray tower 401. The dehumidifying packing layer 404 is an alumina packing layer, which utilizes the water absorption property of alumina to remove moisture from the exhaust gas. Two observation windows 405 are provided on the front side of the spray tower 401 for observing the interior of the spray tower 401 or for maintenance. The observation windows 405 are made of a high-temperature resistant and corrosion-resistant transparent material, used to observe the spraying situation and the status of the packing inside the tower. The combination of packing layers with different materials and structures can adapt to the corrosive components that may be present in the exhaust gas from lithium battery production, effectively improving the contact effect between the exhaust gas and the spray liquid, and enhancing the purification capacity. The dehumidifying packing layer 404 can prevent excessive moisture from entering the subsequent regenerative oxidizer 500, affecting the normal operation and service life of the oxidizer. The observation windows 405 facilitate timely detection and maintenance of problems by staff, and also facilitate the inspection and maintenance of internal equipment.

[0028] In some embodiments, the spraying mechanism includes a spray pipe 423 and a spray head 424. The spray pipe 423 is connected to a spray liquid circulation mechanism, and the spray head 424 is installed at the end of the spray pipe 423. The spray pipe 423 is located above the first packing layer 402 or the second packing layer 403, respectively.

[0029] In some embodiments, the spray liquid circulation mechanism includes a sedimentation tank 410, which is located at the bottom of the spray tower 401 and communicates with the interior of the spray tower 401. The sedimentation tank 410 is equipped with two sets of partitioning mechanisms, which divide the interior of the sedimentation tank 410 into three sedimentation zones for sedimentation and filtration of the sprayed solution. The two sets of partitioning mechanisms inside the sedimentation tank 410 divide its interior into three sedimentation zones. The spray liquid passes through these three sedimentation zones sequentially, and through physical sedimentation, impurities such as solid particles carried in the solution gradually settle, achieving sedimentation and filtration of the sprayed solution. The purified spray liquid can be recycled. Through sedimentation and filtration, the spray liquid is purified, enabling recycling, reducing operating costs, minimizing water waste and the amount of spray liquid replenished, while ensuring the purification effect of the spray liquid and continuously treating waste gas.

[0030] In some embodiments, the separating mechanism includes a partition 414 and a baffle 415. The partition 414 is fixedly installed at the bottom of the sedimentation tank 410, and the baffle 415 is installed at the top of the sedimentation tank 410. The partition 414 and the baffle 415 are staggered, with the baffle 415 located on the side closer to the interior of the spray tower 401, for three-stage sedimentation of the solution inside the sedimentation tank 410. After the spray liquid flows into the sedimentation tank 410, it passes through three sedimentation zones in sequence. Due to the obstruction and guidance of the partition 414 and the baffle 415, the residence time of the solution in the sedimentation tank is extended, allowing impurities to settle sufficiently.

[0031] In this embodiment, the height of the baffle 414 is 3 / 5-4 / 5 of the depth of the sedimentation tank 410, and the height of the baffle 415 is 1 / 2-2 / 3. The baffle 414 and the baffle 415 are made of corrosion-resistant PP or stainless steel, the thickness of the baffle 414 is 5-10mm, and the thickness of the baffle 415 is 3-5mm.

[0032] In some embodiments, the bottoms of the three sedimentation zones are arranged in a "V" shape, and each sedimentation zone is equipped with a drain valve 412 at its bottom. The three drain valves 412 are connected by a drain pipe 413, which is inclined downwards. When it is necessary to clean impurities, the drain valve 412 is opened, and the impurities are discharged from the sedimentation tank 410 through the drain pipe 413 under the action of gravity. The "V"-shaped bottom design and reasonable drain system facilitate regular cleaning of impurities, ensure the sedimentation effect and normal operation of the sedimentation tank 410, and reduce the difficulty and workload of manual cleaning.

[0033] In some embodiments, a circulation pump 420 is installed on the sedimentation tank 410. The inlet of the circulation pump 420 is connected to the interior of the sedimentation tank 410 via a pumping pipe 421, and the outlet of the circulation pump 420 is connected to the spraying mechanism via an outlet pipe 422. When the circulation pump 420 is working, it draws the purified spray liquid from the sedimentation tank 410 and transports it to the spraying mechanism through the outlet pipe 422, thereby realizing the circulation of the spray liquid. The circulation pump 420 provides power for the circulation of the spray liquid, ensuring that the spray liquid can be continuously and stably supplied to the spraying mechanism, thus guaranteeing the continuity and stability of the waste gas treatment process.

[0034] In some embodiments, a liquid extraction tank 416 is provided on one side of the sedimentation tank 410, a filter screen 417 is provided in the communication part between the liquid extraction tank 416 and the interior of the sedimentation tank 410, a water extraction pipe 421 is located inside the liquid extraction tank 416, a liquid level sensor 418 is provided inside the liquid extraction tank 416 for monitoring the liquid level height inside the liquid extraction tank 416, and a liquid inlet 411 is provided on one side of the sedimentation tank 410 for adding spray solution into the sedimentation tank 410.

[0035] In some embodiments, the air inlet of the regenerative thermal oxidizer 500 is connected to the air outlet at the top of the spray tower 401 via an air inlet pipe 501. The air outlet of the regenerative thermal oxidizer 500 is connected to a second fan 600 via an air outlet pipe 502, and the air outlet of the second fan 600 is connected to a chimney 700. The exhaust gas, after being purified by spraying, enters the regenerative thermal oxidizer 500 through the air inlet pipe 501. The regenerative thermal oxidizer 500 uses the heat stored in the heat storage medium to preheat the exhaust gas, bringing it to the oxidation reaction conditions and removing pollutants. The treated gas enters the second fan 600 through the air outlet pipe 502, which provides power for gas emission, allowing the compliant gas to be discharged into the atmosphere through the chimney 700.

[0036] Working Principle: In use, a lithium battery production waste gas recovery device employs a gas collection hood 100 positioned above the equipment in the lithium battery production workshop. Utilizing the suction force generated by the first fan 300, based on the principle of negative pressure extraction, it efficiently extracts the waste gas generated during equipment operation. The waste gas flows through the gas collection pipe 201 into the bag filter 200 to remove electrode material dust. The purified gas then enters the waste gas treatment unit 400. In the spray tower 401 of the waste gas treatment unit 400, the waste gas flows from bottom to top... In the upper flow, the spraying mechanism sprays the spraying liquid delivered by the spraying liquid circulation mechanism onto the packing layer. The exhaust gas and the spraying liquid come into full contact at the packing layer, and the harmful components in the exhaust gas are dissolved or reacted. Afterward, the exhaust gas enters the regenerative thermal oxidizer 500, where the harmful gases in the exhaust gas are decomposed at high temperature. The treated gas enters the second fan 600 through the exhaust pipe 502. The second fan 600 provides power for gas emission, so that the qualified gas is discharged into the atmosphere through the chimney 700.

[0037] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0038] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lithium battery production waste gas recovery device, characterized by, The system includes a gas collection hood, which is installed above the equipment in the lithium battery production workshop to extract the waste gas generated during the operation of the equipment. The other end of the gas collection hood is connected to a bag filter, which is connected to the outlet of the gas collection hood to remove electrode material dust from the production waste gas. The outlet of the bag filter is connected to a waste gas treatment unit. The waste gas treatment unit includes a two-stage spraying mechanism and a spray liquid circulation mechanism. The two-stage spraying mechanism includes a spraying tower. The spraying tower has two sets of packing layers inside. A spraying mechanism is provided above each packing layer for spraying spray liquid onto the packing layer. The exhaust end of the waste gas treatment unit is connected to a regenerative oxidizer. The bag filter, the waste gas treatment unit, and the regenerative thermal oxidizer are connected in series to form a continuous treatment channel for treating the waste gas generated during lithium battery production.

2. The lithium battery production waste gas recovery device according to claim 1, characterized in that, The gas collection hood and the bag filter are connected by a gas collection pipe, and the gas collection pipe is connected to the gas collection hood and the bag filter by a flange. The bag filter is a DMC bag pulse dust collector. A first fan is provided between the bag filter and the exhaust gas treatment unit. The air inlet of the first fan is connected to the air outlet of the bag filter through an air outlet connecting pipe, and the air outlet of the first fan is connected to the air inlet of the exhaust gas treatment unit through an air inlet connecting pipe.

3. The lithium battery production waste gas recovery device according to claim 1, characterized in that, The two sets of filler layers include a first filler layer and a second filler layer, wherein the first filler layer is a CPVC stepped ring filler layer and the second filler layer is a PP Haier ring filler layer; The top of the spray tower is provided with a dehumidifying packing layer, which is an alumina packing layer. Two observation windows are provided on the front side of the spray tower for observing the interior of the spray tower or for maintenance.

4. The lithium battery production waste gas recovery device according to claim 1, characterized in that, The spraying mechanism includes a spray pipe and a spray head. The spray pipe is connected to a spray liquid circulation mechanism, and the spray head is installed at the end of the spray pipe. The spray pipe is located above the first packing layer or the second packing layer.

5. The lithium battery production waste gas recovery device according to claim 4, characterized in that, The spray liquid circulation mechanism includes a sedimentation tank located at the bottom of the spray tower and connected to the interior of the spray tower. The sedimentation tank is equipped with two sets of partitioning mechanisms, which are used to divide the interior of the sedimentation tank into three sedimentation zones for sedimentation and filtration of the sprayed solution.

6. The lithium battery production waste gas recovery device according to claim 5, characterized in that, The separation mechanism includes a partition and a baffle. The partition is fixedly installed at the bottom of the sedimentation tank, and the baffle is installed at the top of the sedimentation tank. The partition and the baffle are staggered. The baffle is located on the side closer to the inside of the spray tower and is used to perform three-stage sedimentation of the solution inside the sedimentation tank.

7. The lithium battery production waste gas recovery device according to claim 5, characterized in that, The bottoms of the three sedimentation zones are arranged in a "V" shape, and each sedimentation zone is equipped with a drain valve at its bottom. The three drain valves are connected by a drain pipe, which is inclined downwards.

8. The lithium battery production waste gas recovery device according to claim 5, characterized in that, The sedimentation tank is equipped with a circulation pump. The inlet of the circulation pump is connected to the inside of the sedimentation tank through a pumping pipe, and the outlet of the circulation pump is connected to the spraying mechanism through an outlet pipe.

9. The lithium battery production waste gas recovery device according to claim 8, characterized in that, One side of the inside of the sedimentation tank is provided with a liquid pumping groove, the liquid pumping groove is provided with a filter screen in communication with the inside of the sedimentation tank, the water pumping pipe is located in the inside of the liquid pumping groove, the inside of the liquid pumping groove is provided with a liquid level sensor for monitoring the liquid level height in the inside of the liquid pumping groove, one side of the sedimentation tank is provided with a liquid inlet for adding a spraying solution to the inside of the sedimentation tank.

10. The lithium battery production waste gas recovery device according to claim 1, characterized in that, The air inlet end of the heat accumulating type oxidation furnace is communicated with the air outlet end of the spraying tower through an air inlet pipe, the air outlet end of the heat accumulating type oxidation furnace is communicated with a second fan through an air outlet pipe, and the air outlet end of the second fan is communicated with a chimney.

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