Kiln exhaust device and system

Abstract

The utility model discloses a kind of kiln exhaust device and system, it is related to ternary positive electrode material technical field.Kiln exhaust device includes smoke exhaust straight pipe;Smoke exhaust straight pipe includes first straight pipe and second straight pipe;Wherein, first straight pipe is located at the outside of kiln furnace body, second straight pipe is located at the inside of kiln furnace body or from the inside of kiln furnace body to first straight pipe extend;First straight pipe is detachably connected with second straight pipe.The setting of smoke exhaust straight pipe has reduced airflow resistance, improved exhaust efficiency, reduced the risk of air pipe blockage and corrosion, effectively improved the frequency of shutdown maintenance, which not only helps to improve the production quality and production efficiency of ternary positive electrode material, but also can reduce production cost and maintenance cost, enhance the market competitiveness of enterprise.The successful development of new type kiln exhaust device will also provide new ideas and methods for the technological progress of ternary positive electrode material industry, and is expected to promote the entire industry to more efficient, environmentally friendly, sustainable direction.

Description

Technical Field

[0001] This utility model relates to the field of ternary cathode material technology, and more specifically, to a kiln exhaust device and system. Background Technology

[0002] As a key component of lithium-ion batteries, the sintering process in the production of ternary cathode materials has a decisive impact on the material's performance. In industrial production, the kiln is the core equipment for achieving high-temperature sintering of ternary materials, and its internal environment control directly affects the product's physicochemical properties and consistency indicators.

[0003] Currently, ternary material sintering kilns generally employ multi-temperature zone designs and atmosphere control systems. Among these, the exhaust system, as a key subsystem for maintaining gas exchange within the kiln, plays a crucial role in discharging reaction waste gas, regulating oxygen content, and maintaining temperature uniformity. A typical kiln exhaust system consists of a main exhaust duct, branch ducts, a fan, and a gas handling device, achieving airflow circulation through the principle of negative pressure. The L-shaped exhaust duct, as a traditional design, is widely used in existing kiln systems due to its simple structure and convenient installation.

[0004] The L-shaped branch pipes are installed inside the kiln. During atmosphere sintering, the right-angled structure of the L-shaped pipes causes turbulence and low-pressure zones in the airflow at the corners, making it easier for the gas-solid mixture to deposit on the pipe walls, resulting in a large amount of crystal formation, duct blockage, and ultimately affecting the normal operation of the kiln. During the sintering process, corrosive gases (such as HF), volatile alkali metal compounds, and dust particles inside the kiln enter the ventilation system with the airflow, corroding the inside of the L-shaped pipes, increasing maintenance costs and creating safety hazards. Simultaneously, the continuous high-temperature environment inside the kiln (typically maintained at 700℃-900℃) accelerates the oxidation and corrosion of the pipe's metal materials, while repeated heating-cooling cycles exacerbate the thermal stress damage to the mullite sleeve. These factors collectively lead to a gradual reduction in the effective pipe diameter, an exponential increase in the system resistance coefficient, and ultimately trigger a chain reaction of unbalanced airflow distribution and localized temperature fluctuations.

[0005] When the efficiency of the exhaust system decreases, the retention of waste gas in the kiln causes abnormal oxygen partial pressure in the sintering zone, directly affecting the dehydration and lattice recombination processes of the precursor. This manifests as microscopic defects in the sintered products, such as uneven lithium volatilization and increased cation mixing, while macroscopically it presents as quality problems such as excessive residual alkali and inconsistent tap density in batches of products. Existing maintenance solutions require manual unblocking or component replacement after furnace shutdown and cooling, with each treatment taking 24-48 hours, severely impacting the stability of continuous production.

[0006] In view of this, this utility model is proposed. Utility Model Content

[0007] The purpose of this utility model is to provide a kiln exhaust device and system to solve the above-mentioned technical problems.

[0008] The embodiments of this utility model can be implemented as follows:

[0009] In a first aspect, an embodiment of the present invention provides a kiln exhaust device, which includes a straight exhaust pipe.

[0010] The flue gas straight pipe includes a first straight pipe and a second straight pipe; wherein, the first straight pipe is located outside the kiln body, and the second straight pipe is located inside the kiln body or extends from inside the kiln body to the first straight pipe;

[0011] The first straight pipe and the second straight pipe can be detachably connected.

[0012] In an optional embodiment, the first straight tube is provided with a removable seal at the end away from the second straight tube;

[0013] The outer diameter of the seal is smaller than the outer diameter of the exhaust pipe, but larger than the inner diameter of the exhaust pipe.

[0014] In an optional embodiment, a lifting element is provided at the end of the seal away from the first straight tube.

[0015] In an optional embodiment, an exhaust port is provided on the wall of the first straight pipe.

[0016] In an optional embodiment, the exhaust port is located near one end of the second straight pipe, and a first control port and a second control port are provided on the pipe wall of the first straight pipe.

[0017] The first control port penetrates the wall of the first straight pipe, and the second control port is embedded in the inner side of the wall of the first straight pipe.

[0018] In an optional embodiment, the first straight tube has a connecting portion in the radial direction at its end near the second straight tube.

[0019] The connecting part is located on the outer side of the wall of the first straight pipe, and connecting holes are evenly provided.

[0020] A first gap is provided at the end of the connecting hole near the second straight pipe.

[0021] In an optional embodiment, when the second straight pipe extends into the first straight pipe inside the kiln body, the second straight pipe is located inside the wall of the first straight pipe.

[0022] In an optional embodiment, a second gap is provided between the first straight pipe and the second straight pipe.

[0023] Secondly, embodiments of this utility model provide a kiln system, which includes the kiln exhaust device as described above.

[0024] In an optional embodiment, the kiln system further includes a waste gas collection device, a filtration and purification device, a sensing device, a heating device, a cooling device, a gas supply device, and a control device.

[0025] This utility model has the following beneficial effects:

[0026] The kiln exhaust device provided in this embodiment includes a first straight pipe and a second straight pipe. The first straight pipe is located outside the kiln body, and the second straight pipe is located inside the kiln body or extends from inside the kiln body towards the first straight pipe. The first and second straight pipes are detachably connected. This detachable connection facilitates normal kiln production. The straight exhaust pipe reduces airflow resistance, improves exhaust efficiency, reduces the risk of duct blockage and corrosion, and effectively reduces downtime for maintenance. This not only helps improve the production quality and efficiency of ternary cathode materials but also reduces production and maintenance costs, enhancing the company's market competitiveness. The successful development of this new kiln exhaust device will also provide new ideas and methods for technological advancement in the ternary cathode material industry, and is expected to drive the entire industry towards a more efficient, environmentally friendly, and sustainable direction. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the kiln exhaust system from a first-person perspective.

[0029] Figure 2 This is a schematic diagram of the kiln exhaust system from a third-person perspective.

[0030] Figure 3 This is a schematic diagram of the gate structure from a second-person perspective;

[0031] Figure 4 Here are schematic diagrams of the cross-section of the kiln brick plug from multiple perspectives: (a) first perspective, (b) second perspective;

[0032] Figure 5 Here are schematic diagrams of the first straight tube cross-section from multiple perspectives: (a) second perspective, (b) first perspective, (c) third perspective.

[0033] Key component symbols: 100 - Kiln exhaust device from first perspective; 100a - Kiln exhaust device from third perspective; 110 - Brick plug; 111 - Lifting component; 120 - First straight pipe; 122 - Inspection port; 124 - Third masonry section; 126 - First masonry section; 127 - Connection part; 128 - Top surface; 130 - Connection hole; 131 - Bolt; 132 - Gate plate; 133 - Lifting hole; 134 - First control port; 135 - Second control port; 136 - Exhaust port; 160 - Second straight pipe; 162 - Second gap; 164 - Second masonry section; 166 - Fourth masonry section; 168 - Arch; 170 - First gap; 200 - Kiln exterior; 300 - Kiln interior. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0036] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0037] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model 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 utility model.

[0038] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0039] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0040] The following describes in detail the overall structure, working principle, and technical effects of the kiln exhaust device provided by this utility model through embodiments and in conjunction with the accompanying drawings.

[0041] First Embodiment

[0042] Please refer to Figure 1 First-person view of the kiln exhaust device 100 and Figure 2 The kiln exhaust device 100a is shown in the third perspective. This embodiment provides a kiln exhaust device, which includes a straight exhaust pipe. The straight exhaust pipe includes a first straight pipe 120 and a second straight pipe 160. The first straight pipe 120 is located outside the kiln body 200, and the second straight pipe 160 extends from inside the kiln body 300 to the first straight pipe 120.

[0043] It should be noted that in other embodiments of this utility model, the second straight pipe 160 may also be disposed inside the kiln body.

[0044] In this embodiment, the exhaust pipe is cylindrical. In other embodiments of this utility model, the exhaust pipe can be designed as circular or other shapes as needed.

[0045] In this embodiment, the first straight pipe 120 and the second straight pipe 160 are coaxially distributed. The inner walls of the first straight pipe 120 and the second straight pipe 160 are independently constructed using mullite material. The thickness of the constructed portion is adjusted reasonably according to the actual smoke exhaust volume of the exhaust pipe. A multi-view structural schematic diagram of the first straight pipe 120 and the first constructed portion 126 is shown below. Figure 5 (a) Second-person perspective, (b) First-person perspective, (c) Third-person perspective.

[0046] Specifically, the second masonry portion 164 on the inner side of the second straight pipe 160 extends outward from the inside of the kiln body to the inner side of the first masonry portion 126 of the first straight pipe 120.

[0047] It should be noted that mullite possesses high-temperature stability, enabling it to withstand the high-temperature environment at the top of the kiln without softening or deformation. Its low thermal conductivity effectively reduces heat loss from the kiln top, improving thermal efficiency and reducing energy consumption. The construction method facilitates a stable, self-supporting structure, dispersing mechanical stress at the kiln top and preventing collapse. Furthermore, mullite exhibits superior thermal shock resistance and wear resistance compared to ordinary refractory bricks, reducing the frequency of kiln shutdowns for maintenance and lowering operating costs.

[0048] The second straight pipe 160 is an improvement upon the original L-shaped exhaust duct. It is coaxially distributed with the first straight pipe 120. This straight pipe design reduces airflow resistance, improves ventilation efficiency, and lowers the risk of duct blockage and corrosion. It also allows for maintenance and cleaning during normal production, effectively reducing the frequency of downtime for maintenance. This not only helps improve the production quality and efficiency of ternary cathode materials but also reduces production and maintenance costs, enhancing the company's market competitiveness.

[0049] In this embodiment, a third masonry section 124 is provided on the outer side of the first straight pipe 120, which is constructed using alumina hollow spherical bricks.

[0050] It should be noted that the first masonry section 126 and the third masonry section 124 together form the first straight pipe 120. The outer wall of the first straight pipe 120 is made of alumina hollow spherical bricks filled with micropores, which can significantly reduce heat conduction, reduce heat loss from the flue pipe to the external environment, and at the same time avoid the influence of low external temperature on the flue gas temperature inside the pipe, thus maintaining stable flue gas emission.

[0051] In addition, since the exhaust pipe is in long-term contact with high-temperature exhaust gas or may contain corrosive gases, the inner wall of the pipe is constructed with mullite and the outer wall is constructed with alumina hollow spherical bricks. This can effectively protect the pipe wall or supporting structure of the exhaust pipe from high-temperature oxidation or softening, reduce the load on the exhaust system, and lower the requirements for the supporting structure.

[0052] A removable seal is provided at the top of the exhaust pipe, that is, at the end of the first straight pipe 120 away from the second straight pipe 160; in this embodiment, the seal is a mullite brick plug 110. The shape of the mullite brick plug 110 is reasonably set according to the shape of the exhaust pipe, and its structural schematic diagram is shown in [reference needed]. Figure 4 (a) First-person perspective, (b) Second-person perspective.

[0053] The use of mullite brick plug 110 at the top of the kiln has the following advantages: it helps reduce the intake of cold air or the leakage of high-temperature gases, maintaining the stability of the atmosphere inside the kiln; secondly, its high-temperature resistance, heat insulation, corrosion resistance, and mechanical stability ensure the long-term safe operation of the kiln, while optimizing energy consumption and process control. The specifications of the brick plug 110 can be reasonably set according to the actual size of the kiln.

[0054] It should be noted that the outer diameter of the mullite brick plug 110 is smaller than the outer diameter of the flue gas straight pipe, but larger than the inner diameter of the flue gas straight pipe. This design can effectively maintain the sealing of the kiln body and also facilitate the disassembly, maintenance or replacement of the brick plug 110.

[0055] A lifting element 111 is provided at the end of the mullite plug 110 away from the first straight tube 120, that is, at the end of the mullite plug 110 facing the atmosphere, so that the operator can easily pick up or place the plug 110.

[0056] The lifting component 111 can be fixed or detached as needed, and its installation method can be selected from bolts 131, screws, or hooks. If the lifting component 111 is fixed too tightly, it may cause the brick plug 110 to crack and the lifting component 111 to break. If a mechanical lifting component 111 is used, sufficient expansion space needs to be reserved.

[0057] In this embodiment, the lifting component 111 used is a hook. In other embodiments of this utility model, the lifting component 111 used can be reasonably adjusted or replaced.

[0058] An exhaust port 136 is provided on the wall of the first straight pipe 120. In this embodiment, the exhaust port 136 is located at the middle of the first straight pipe 120. The shape of the exhaust port 136 is not specifically specified in this utility model, and it can be reasonably designed according to the actual situation. Specifically, in this embodiment, the shape of the exhaust port 136 is circular.

[0059] It should be noted that the exhaust port 136 connects the inside of the flue pipe to the outside atmosphere. It is mainly used to connect the induced draft fan to provide negative pressure power inside the kiln, which is conducive to driving the exhaust gas to flow along the pipe, maintaining the kiln in a slightly negative pressure state, and preventing the flue gas from overflowing and causing environmental pollution.

[0060] In this embodiment, an inspection port 122 is also provided on the wall of the first straight pipe 120, which is located in the same radial direction as the exhaust port 136.

[0061] It should be noted that the diameter of the inspection port 122 is based on allowing the operator's arm or tools to enter, and is not specifically limited in this embodiment; it can be a flange cover or a quick-opening sealing door.

[0062] The inspection port 122 has the following characteristics: It allows direct observation of the interior of the first straight pipe 120 to check for ash accumulation, corrosion, refractory material detachment, or blockage, avoiding blind disassembly; manual or mechanical tools can enter the inside of the exhaust pipe through the inspection port 122 to clean scale (such as lithium salt deposits and dust), replace damaged refractory linings, or repair weld cracks; if exhaust is obstructed or temperature is abnormal, the inspection port 122 can be used for timely troubleshooting (such as thermocouple calibration and airflow distribution adjustment), reducing downtime; in case of emergencies (such as pipe fire or flammable gas accumulation), fire extinguishing media can be injected or ventilation can be used to dilute the gas through the inspection port 122; and it avoids workers cutting pipes or climbing high-risk areas for maintenance.

[0063] In this embodiment, the exhaust port 136 is located near one end of the second straight pipe 160, and a first control port 134 and a second control port 135 are provided on the pipe wall of the first straight pipe 120; wherein, the first control port 134 penetrates the pipe wall of the first straight pipe 120, and the second control port 135 is embedded in the inner side of the pipe wall of the first straight pipe 120.

[0064] Specifically, in this embodiment, the exhaust pipe is a cylindrical pipe. The control port is opened through one side wall of the exhaust pipe and embedded in the inner wall of the other three side walls. This arrangement facilitates real-time adjustment of the control opening according to the required exhaust volume and pressure, maintaining the stability of the control.

[0065] It should be noted that the control component used in this embodiment is a gate 132. By dynamically adjusting the opening of the gate 132, the following characteristics are achieved: preventing high-temperature flue gas from overflowing, avoiding excessive intake of cold air leading to heat loss or unstable combustion, reducing heat dissipation from the kiln body, and further achieving the effects of regulating airflow and balancing pressure. The structural schematic diagram of the exhaust pipe and the gate 132 from a second-view perspective is shown below. Figure 3 .

[0066] Specifically, along the radial direction of the first straight pipe 120, the gate 132 extends outward from the embedded second control port 135 through the through first control port 134, and a lifting hole 133 is provided at the extension of the gate 132 to facilitate dynamic adjustment of the opening degree of the gate 132.

[0067] In this embodiment, a second gap 162 is provided between the extension portion of the second straight pipe 160 and the inner wall of the first straight pipe 120. The second gap 162 can reduce the impact of mechanical vibration or thermal stress on the masonry portion inside the wall of the first straight pipe 120, delaying cracking and peeling; it facilitates the smooth disassembly of the first straight pipe 120 and the second straight pipe 160, reduces friction and damage to the pipe wall during the process, takes into account both sealing performance and quick disassembly and assembly requirements, and extends service life.

[0068] It should be noted that the second gap 162 is filled with a high-temperature resistant and heat-insulating material to maintain a slightly negative pressure environment inside the kiln and ensure consistent sintering quality; to prevent external cold air from entering the kiln and reduce local oxidation reactions; the filling material can also absorb the stress generated by the thermal expansion and contraction of the kiln and prevent the rigid structure from cracking.

[0069] The material filling the second gap 162 can be partially replaced without requiring a complete kiln shutdown for maintenance, thus reducing maintenance costs.

[0070] In this specific embodiment, cotton blankets are selected as the material. They can be cut and compressed at will, easily filling pipe joints and kiln seams to ensure a tight seal. Cotton blankets have a low density, which has little impact on the load on the kiln structure. They can be directly filled or wrapped without welding or complicated tools, thus shortening the maintenance cycle.

[0071] In other embodiments of this utility model, the filling material can also be replaced with loose cotton or ceramic fiber material, etc., according to actual needs.

[0072] In this embodiment, the second straight pipe 160 extends from the inside of the kiln body 300 to the first straight pipe 120. The extended part is inside the pipe wall of the first straight pipe 120, which facilitates the smooth discharge of waste gas and flue gas inside the kiln. There is no airflow resistance, and there is no risk of duct blockage and corrosion. The ventilation efficiency is significantly improved.

[0073] In this embodiment, a connecting portion 127 is provided in the radial direction of the first straight pipe 120 near the end of the second straight pipe 160; the connecting portion 127 is provided on the outer side of the pipe wall of the first straight pipe 120 and has connecting holes 130 evenly provided.

[0074] It should be noted that the connecting part 127 and the first straight tube 120 can be integrally formed or fixedly connected. The connection method can be selected according to actual needs, such as welding.

[0075] In this embodiment, the connecting part 127 is parallel to the top surface 128 of the kiln body. The connecting hole 130 opened in the connecting part 127 facilitates its disassembly from the second straight pipe 160. During normal production, it can also be inspected and cleaned, effectively reducing the number of shutdowns for maintenance, improving production efficiency, and reducing production costs.

[0076] Specifically, the number of connecting holes 130 can be reasonably set according to the actual shape of the exhaust pipe. In this embodiment, the exhaust pipe is a columnar body, and the connecting holes 130 are located on the outer side of each side of the columnar body to ensure the stability of the first straight pipe 120 connection. In other embodiments of this utility model, connecting holes 130 can also be added at the included angle of each pair of sides of the columnar body.

[0077] The connection between the first straight pipe 120 and the second straight pipe 160 can be made by bolt 131, or by flange in other embodiments of this utility model.

[0078] In this embodiment, a first gap 170 is provided at one end of the connecting hole 130 near the second straight pipe 160.

[0079] It should be noted that the outer wall of the second straight pipe 160 is provided with a fourth masonry section 166, and the second masonry section 164 and the fourth masonry section 166 together form the second straight pipe 160; the first gap 170 is located between the top surface 128 of the kiln body and the fourth masonry section 166.

[0080] Specifically, the first gap 170 set in this embodiment is used to fill the fiber blanket, which has the following characteristics: it can be cut and compressed at will, and easily filled; no welding or complicated tools are required, and the gap can be directly covered or filled, shortening the maintenance cycle; if local damage occurs, the fiber blanket can be directly replaced without the need for overall kiln shutdown for maintenance, reducing maintenance costs; it can also effectively prevent gas leakage in the flue gas straight pipe, reducing heat loss and dust emission.

[0081] In this embodiment, the second straight pipe 160 is connected through the dome 168 in the kiln body. This further reduces airflow resistance and effectively prevents crystal production during atmosphere sintering, thus avoiding blockage of the exhaust pipe. This reduces maintenance costs and improves production efficiency.

[0082] In summary, the kiln exhaust device provided in this embodiment replaces the existing L-shaped exhaust pipe inside the kiln with a straight pipe connection, and adjusts the original L-shaped pipe's design location from inside the kiln to outside. Its detachable connection facilitates normal kiln production. The straight exhaust pipe reduces airflow resistance, improves exhaust efficiency, reduces the risk of duct blockage and corrosion, and effectively reduces downtime for maintenance. This not only helps improve the production quality and efficiency of ternary cathode materials but also reduces production and maintenance costs, enhancing the company's market competitiveness. The successful development of this new kiln exhaust device will also provide new ideas and methods for technological advancement in the ternary cathode material industry, and is expected to drive the entire industry towards a more efficient, environmentally friendly, and sustainable direction.

[0083] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A furnace exhaust device, characterized by comprising: The kiln exhaust system includes a straight exhaust pipe; The exhaust pipe includes a first straight pipe and a second straight pipe; wherein, the first straight pipe is located outside the kiln body, and the second straight pipe is located inside the kiln body or extends from inside the kiln body to the first straight pipe; The first straight pipe and the second straight pipe are detachably connected.

2. The furnace extraction device according to claim 1, characterized in that The first straight pipe has a removable seal at the end away from the second straight pipe; The outer diameter of the seal is smaller than the outer diameter of the exhaust pipe, but larger than the inner diameter of the exhaust pipe.

3. The furnace extraction device according to claim 2, characterized in that A lifting element is provided at the end of the seal that is away from the first straight tube.

4. The kiln exhaust device according to claim 1, characterized in that, An exhaust port is provided on the wall of the first straight pipe.

5. The kiln exhaust device according to claim 4, characterized in that, The exhaust port is located near one end of the second straight pipe, and a first control port and a second control port are provided on the pipe wall of the first straight pipe. The first control port penetrates the wall of the first straight pipe, and the second control port is embedded in the inner side of the wall of the first straight pipe.

6. The kiln exhaust device according to claim 1, characterized in that, The first straight pipe has a connecting portion in the radial direction at its end near the end of the second straight pipe; The connecting part is located on the outer side of the wall of the first straight pipe, and connecting holes are evenly provided. A first gap is provided at one end of the connecting hole near the second straight pipe.

7. The kiln exhaust device according to claim 1, characterized in that, When the second straight pipe extends into the first straight pipe inside the kiln body, the second straight pipe is located inside the pipe wall of the first straight pipe.

8. The kiln exhaust device according to claim 7, characterized in that, A second gap is provided between the extension of the second straight pipe and the wall of the first straight pipe.

9. A kiln system, characterized in that, It includes the kiln exhaust device as described in any one of claims 1-8.

10. The kiln system according to claim 9, characterized in that, The kiln system also includes a waste gas collection device, a filtration and purification device, a sensing device, a heating device, a cooling device, a gas supply device, and a control device.

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