Internal heating type flue gas rotary kiln
By setting up isolation components and flow guiding structures in the internally heated rotary kiln, heat transfer between the air inlet hood and the kiln body is isolated, solving the problems of kiln body instability and insulation material detachment, thereby improving the stability and sealing performance of the kiln body and reducing manufacturing costs.
Patent Information
- Application Number
- CN202423293836.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2034-12-30
AI Technical Summary
In traditional internally heated rotary kilns, the kiln body material is in direct contact with the air inlet hood under high-temperature flue gas heating, resulting in structural instability, unstable kiln rotation, severe thermal deformation of the kiln body at the air inlet hood, and easy detachment of the heat-insulating refractory material, which increases manufacturing costs and affects sealing performance.
A first isolation component is installed between the air inlet hood and the outer peripheral wall of the kiln body to form a rotary seal fit. Heat is isolated through axial and radial channels and flow guiding structures. Combined with the circulation system, the kiln body temperature is reduced. A second isolation component is used to increase the heat insulation distance and reduce heat transfer.
Reduce the requirements for kiln body materials, decrease thermal deformation and insulation material shedding, improve the structural stability and sealing performance of the kiln body, reduce manufacturing costs, and extend service life.
Smart Images
Figure CN223596466U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of rotary kiln technology, specifically relating to an internally heated flue gas rotary kiln. Background Technology
[0002] In the structural design of internally heated rotary kilns, high-temperature heating flue gas typically enters the kiln from around the kiln shell to heat the materials or internal heat exchange tubes. This is commonly used in industries such as low-rank coal pyrolysis, pre-carbonization of lithium battery anode materials, and high-temperature reduction of metal ores. The gas inlet method is as follows: Figure 1 The structure shown requires a high temperature for the high-temperature heating flue gas, mostly between 800℃ and 1100℃, depending on the material reaction conditions. Traditional structures like this have several problems: the heating kiln material is in direct contact with the air inlet hood. Due to the high temperature of the flue gas, the material requirements at this point in the kiln are higher. Prolonged high temperatures can affect the stability of the kiln structure and even its rotation. A common solution is to increase the thickness of the kiln body, but this increases manufacturing costs. Furthermore, the kiln body at the air inlet hood expands due to prolonged heating, increasing the likelihood of deformation and ultimately affecting its sealing performance and lifespan. Additionally, the insulation and refractory materials installed inside the kiln body are prone to detachment due to the high temperature concentration at the air inlet and the inconsistent expansion properties between the metal and the insulation / refractory materials. Utility Model Content
[0003] To address the aforementioned technical problems, the purpose of this utility model is to provide a relatively stable internally heated rotary kiln for flue gas.
[0004] To achieve the above objectives, this utility model provides the following technical solution:
[0005] The internally heated rotary kiln includes a kiln body and an air inlet hood. The air inlet hood has a high-temperature flue gas passage that communicates with the kiln body. A first isolation component is provided between the air inlet hood and the outer peripheral wall of the kiln body to form a gap between the inner side of the air inlet hood and the outer peripheral wall of the kiln body. The first isolation component and the outer peripheral wall of the kiln body form a rotary sealing fit.
[0006] In a further embodiment, at least one axial channel is provided in the first isolation component, which is arranged axially along the outer peripheral wall of the kiln body and is located between the air inlet hood and the outer peripheral wall of the kiln body.
[0007] In a further embodiment, a radial channel communicating with the axial channel is also provided in the first isolation component, and the radial channel is located outside the air intake shroud.
[0008] In a further embodiment, the first isolation component is provided with a vent that communicates with the radial channel.
[0009] As a further implementation, the axial channel is in communication with the high-temperature flue gas channel, and a communication hole with a size smaller than a cross section of the axial channel is arranged at a communication position of the axial channel and the high-temperature flue gas channel.
[0010] As a further implementation, a flow guide structure changing fluid flow in the axial channel or / and the radial channel is arranged.
[0011] As a further implementation, a circulating system for introducing gas into the air inlet is further included, the circulating system includes a waste heat utilization device, a gas purification device, and a pressurized fan, the waste heat utilization device is connected with an exhaust end of the rotary kiln, the waste heat utilization device is connected with the gas purification device, a gas exhaust end of the gas purification device is connected with the pressurized fan, and the pressurized fan is in communication with the air inlet.
[0012] As a further implementation, a second isolation component is further arranged outside the kiln body and covers the outer peripheral wall of the kiln body, the second isolation component is inside the first isolation component, a rotating sealing fit is formed between the inside of the first isolation component and the second isolation component, an annular spacing channel is formed between the inner wall of the second isolation component and the outer peripheral wall of the kiln body, and the spacing channel is arranged axially along the outer peripheral wall of the kiln body.
[0013] As a further implementation, a gas inlet pipe assembly in communication with the spacing channel is arranged in the kiln body, the gas inlet pipe assembly is rotationally connected to a rotating support component at an end of the kiln body, a rotating joint connected with the gas inlet pipe assembly is assembled on the rotating support component, and a fluid feeding system for feeding fluid medium into the rotating joint is in communication with the rotating joint.
[0014] As a further implementation, a flow guide structure changing the direction of fluid medium introduced into the spacing channel is arranged in the spacing channel.
[0015] Compared with the prior art, the beneficial effects of the present application are that, through the arrangement of the first isolation component, direct contact between the air inlet cover and the kiln body is avoided, the heat diffusion ability of the air inlet cover towards the kiln body is reduced, the temperature at the air inlet of the kiln body is correspondingly reduced, the requirements for the kiln body material are reduced, the probability of thermal deformation at the air inlet of the kiln body is correspondingly reduced, and the possibility of falling of the internal heat-insulating refractory material is reduced. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 FIG. 1 is a structural schematic diagram of a rotary kiln;
[0017] Figure 2 FIG. 2 is a system schematic diagram of the present application;
[0018] The reference signs in the drawings represent the following:
[0019] 10, kiln body, 11, air inlet cover, 12, high-temperature flue gas passage, 13, first isolation component, 14, axial passage, 15, radial passage, 16, air vent, 17, communication hole, 18, waste heat utilization device, 19, gas purification device, 20, pressure fan, 21, second isolation component, 22, sealing ring, 23, rotary sealing element, 24, spacing passage, 25, air inlet pipeline assembly, 26, rotary support component, 27, rotary joint. DETAILED DESCRIPTION
[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0021] Please refer to Figure 2 As shown in the figure, the internal heating type flue gas rotary kiln comprises a kiln body 10 and an air inlet cover 11. The kiln body 10 can rotate under external driving. The air inlet cover 11 is fixedly arranged relative to the kiln body 10. The air inlet cover 11 has a high-temperature flue gas passage 12 that is in communication with the kiln body 10. High-temperature flue gas can be introduced into the kiln body 10 through the high-temperature flue gas passage 12. A first isolation component 13 is arranged between the air inlet cover 11 and the outer peripheral wall of the kiln body 10 to form a space between the inner side of the air inlet cover 11 and the outer peripheral wall of the kiln body 10. The first isolation component 13 is in rotary sealing cooperation with the outer peripheral wall of the kiln body 10. Since the high-temperature flue gas introduced into the air inlet cover 11 has a high temperature, the temperature of the air inlet cover 11 is also relatively high. The arrangement of the first isolation component 13 avoids direct contact between the air inlet cover 11 and the kiln body 10, reduces the heat transfer capacity between the air inlet cover 11 and the kiln body 10, and enables the high-temperature flue gas to directly enter the kiln body 10. Thus, the risk of affecting the stability of the structure of the kiln body 10 due to the high temperature at the air inlet of the kiln body 10 caused by the direct contact between the air inlet cover 11 and the kiln body 10 can be reduced.
[0022] In some embodiments, in order to further enable the first isolation component 13 to have good heat insulation capacity, an axial passage 14 is arranged in the first isolation component 13 and is arranged along the axial direction of the outer peripheral wall of the kiln body 10. The axial passage 14 is between the air inlet cover 11 and the outer peripheral wall of the kiln body 10. The axial passage 14 can further hinder the heat transfer capacity between the air inlet cover 11 and the kiln body 10.
[0023] In some embodiments, a radial channel 15 is further arranged in the first isolation component 13 and is in communication with the axial channel 14, and the radial channel 15 is located outside the air inlet cover 11. By arranging the radial channel 15, the heat on the side of the air inlet cover 11 can be isolated, and the heat diffusion of the air inlet cover 11 to the side can be reduced.
[0024] In some embodiments, in order to arrange the air vent 16 in the first isolation component 13 and in communication with the radial channel 15, low-temperature gas can be sent into the radial channel 15 and the axial channel 14 through the air vent 16, so as to further improve the heat insulation capacity and cool the air inlet cover 11, thereby prolonging the service life of the air inlet cover 11.
[0025] In some embodiments, the axial channel 14 is in communication with the high-temperature flue gas channel 12, and a communication hole 17 with a size smaller than the cross section of the axial channel 14 is arranged at the communication position of the axial channel 14 and the high-temperature flue gas channel 12. Here, by arranging the axial channel 14 in communication with the high-temperature flue gas channel 12, the low-temperature gas in the axial channel 14 can be mixed with the high-temperature flue gas and enter the kiln body 10, so as to adjust the temperature of the high-temperature flue gas entering the kiln body 10 as required; and by arranging the communication hole 17, the flow capacity of the gas in the axial channel 14 towards the high-temperature flue gas channel 12 can be increased, and the mixing with the high-temperature flue gas can be better. Of course, the communication hole 17 is not limited to being arranged as a through hole in the plate, but can also be arranged as a baffle plate at the end of the axial channel 14, and a through hole is formed between the baffle plate and the inner wall of the axial channel 14.
[0026] In some embodiments, a flow guide structure is arranged in the axial channel 14 and / or the radial channel 15 to change the fluid flow in the channels. The flow guide structure can be arranged in the form of a spiral channel, a flow guide plate, a flow guide hole plate, etc., mainly to prolong the flow path of the gas in the channel, so as to improve the heat insulation capacity.
[0027] In some embodiments, the rotary kiln further comprises a circulating system for sending gas into the air vent 16, and the circulating system comprises a waste heat utilization device 18, a gas purification device 19, and a pressurized fan 20. The waste heat utilization device 18 is connected to the exhaust end of the rotary kiln, i.e. the exhaust gas discharged from the kiln body 10 has a high temperature, and the temperature can be utilized by the waste heat utilization device 18 to reduce the temperature of the exhaust gas. The waste heat utilization device 18 is connected to the gas purification device 19, and the gas purification device 19 can filter the particulate impurities in the exhaust gas and purify the gas. The gas discharge end of the gas purification device 19 is connected to the pressurized fan 20, and the pressurized fan 20 is in communication with the air vent 16. By arranging the pressurized fan 20, the gas entering the first heat insulation assembly can have a certain pressure, so as to more stably enter the high-temperature flue gas channel 12 and mix with the high-temperature flue gas.
[0028] In some embodiments, in order to further reduce the temperature of the outer periphery of the kiln body 10 in the high-temperature flue gas passage 12, a second isolation component 21 is arranged on the outer periphery of the kiln body 10. The second isolation component 21 is fixedly arranged on the outer periphery of the kiln body 10. The second isolation component 21 is located on the inner side of the first isolation component 13. A rotating seal is formed between the inner side of the first isolation component 13 and the second isolation component 21. That is, a sealing ring 22 can be fixed on the inner side of the first isolation component 13. The two ends of the sealing ring 22 extend towards the two ends of the first isolation component 13 to increase the distance between the end of the sealing ring 22 and the high-temperature flue gas passage 12. A rotating seal 23 is arranged between the end of the sealing ring 22 and the outer wall of the second isolation component 21 to seal it. An annular spacing passage 24 is formed between the inner wall of the second isolation component 21 and the outer periphery of the kiln body 10. The spacing passage 24 is arranged axially along the outer periphery of the kiln body 10, that is, the length of the spacing passage 24 on both sides of the high-temperature flue gas passage 12 is increased to increase the heat insulation distance.
[0029] In some embodiments, an air inlet pipe assembly 25 is arranged in the kiln body 10 and communicates with the spacing passage 24. The air inlet pipe assembly 25 is rotatably connected to a rotating support component 26 at the end of the kiln body 10. The rotating support component 26 is a component that supports the rotation of the kiln body 10 and is commonly used in rotary kilns. A rotating joint 27 is assembled on the rotating support component and connected to the air inlet pipe assembly 25. The air inlet pipe assembly 25 includes a radial pipe arranged radially in the kiln body 10 and an axial pipe connected to the radial pipe. The axial pipe is rotatably arranged on the rotating support component. The radial pipe communicates with the spacing passage 24. The rotating joint 27 is located on the outer side of the rotating support component. The rotating joint 27 is connected to a fluid feeding system that feeds fluid medium into it. The fluid feeding system can be the same as the above-mentioned circulating system. For example, two air pipes can be branched at the outlet of the pressurized fan 20. One air pipe communicates with the air inlet 16 and the other air pipe communicates with the rotating joint 27.
[0030] In some embodiments, a flow guide structure is arranged in the spacing passage 24 to change the direction of the fluid medium flowing into it. The flow guide structure can also be a spiral passage, a flow guide plate, a flow guide hole plate, etc. The main purpose is to lengthen the flow path of the gas in the passage to improve the heat insulation capacity.
[0031] The rotary kiln with the above structure can use the original main material for the kiln body 10, and the thickness can be reduced, and the highest working temperature of the main material of the kiln body 10 is less than or equal to 300 DEG C; the second isolation component 21 is not affected by external force, so the material for manufacturing the second isolation component 21 can be reduced in thickness, and the highest working temperature is less than or equal to 500 DEG C; the working temperature at the communication hole 17 at the end of the axial channel 14 is about 2 / 3 of the high-temperature flue gas temperature; through the above structure design and flow design, the defects of the traditional design are avoided, and the manufacturing cost of the kiln body 10 is reduced, and the safety is improved.
[0032] Finally, it should be noted that: the above is only the preferred embodiment of the present application, and is not intended to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.
Claims
1. An internal heat type flue gas rotary kiln, comprising a kiln body and an air inlet cover, the air inlet cover having a high-temperature flue gas passage in communication with the kiln body, characterized in that a first isolation component is arranged between the air inlet cover and the outer peripheral wall of the kiln body to form a space between the inner side of the air inlet cover and the outer peripheral wall of the kiln body, and the first isolation component is in rotational sealing cooperation with the outer peripheral wall of the kiln body.
2. The internal heat type flue gas rotary kiln according to claim 1, characterized in that an axial passage is arranged in the first isolation component and is axially arranged along the outer peripheral wall of the kiln body, and the axial passage is between the air inlet cover and the outer peripheral wall of the kiln body.
3. The internal heat type flue gas rotary kiln according to claim 2, characterized in that a radial passage is further arranged in the first isolation component and is in communication with the axial passage, and the radial passage is on the outer side of the air inlet cover.
4. The internal heat type flue gas rotary kiln according to claim 3, characterized in that a gas inlet is arranged on the first isolation component and is in communication with the radial passage.
5. The internal heat type flue gas rotary kiln according to claim 4, characterized in that the axial passage is in communication with the high-temperature flue gas passage, and a communication hole with a size smaller than the cross section of the axial passage is arranged at the communication position of the axial passage and the high-temperature flue gas passage.
6. The internal heat type flue gas rotary kiln according to claim 4 or 5, characterized in that a flow guide structure is arranged in the axial passage and / or the radial passage to change the fluid flow in the axial passage and / or the radial passage.
7. The internal heat type flue gas rotary kiln according to claim 4 or 5, characterized in that a circulation system for introducing gas into the gas inlet is further included, the circulation system comprises a waste heat utilization device, a gas purification device, and a pressurized fan, the waste heat utilization device is connected to the exhaust end of the rotary kiln, the waste heat utilization device is connected to the gas purification device, the gas discharge end of the gas purification device is connected to the pressurized fan, and the pressurized fan is in communication with the gas inlet.
8. The internal heat type flue gas rotary kiln according to claim 1, characterized in that a second isolation component is further arranged on the outer peripheral wall of the kiln body, the second isolation component is on the inner side of the first isolation component, the inner side of the first isolation component and the second isolation component form a rotational sealing cooperation, an annular spacing passage is formed between the inner wall of the second isolation component and the outer peripheral wall of the kiln body, and the spacing passage is axially arranged along the outer peripheral wall of the kiln body.
9. The internal heat type flue gas rotary kiln according to claim 8, characterized in that an air inlet pipe assembly is arranged in the kiln body and is in communication with the spacing passage, the air inlet pipe assembly is rotationally connected to a rotary support component on the end of the kiln body, a rotary joint connected to the air inlet pipe assembly is assembled on the rotary support component, and a fluid feeding system for feeding fluid medium into the rotary joint is in communication with the rotary joint.
10. The internal heat type flue gas rotary kiln according to claim 8 or 9, characterized in that a flow guide structure is arranged in the spacing passage to change the direction of the fluid medium fed into the spacing passage.