Rotary furnace

Abstract

The rotary furnace comprises an outer cylinder and an inner cylinder, the inner cylinder is sleeved with the outer cylinder, the outer cylinder is fixedly connected with the inner cylinder, a drying cavity is defined between the outer cylinder and the inner cylinder, the outer cylinder is provided with a head end and a tail end which are opposite in the axial direction, the head end of the outer cylinder is provided with a raw material inlet and a gas inlet, and the tail end of the outer cylinder is provided with a gas outlet. A baking cavity is defined in the inner side of the inner cylinder, a feeding opening is formed in the end, close to the tail end, of the inner cylinder, the baking cavity is communicated with the drying cavity through the feeding opening, a gaseous product outlet and a solid product outlet are formed in the inner cylinder, and the gaseous product outlet and the solid product outlet are both located in the side, away from the tail end, of the head end. According to the rotary furnace, the drying process and the baking process of the materials can be achieved at the same time, compared with a rotary furnace for achieving the same retention time of the materials in the related technology, the overall length of equipment can be reduced, the space utilization rate of the equipment can be increased, the heat exchange efficiency is improved, and therefore the energy consumption of the rotary furnace is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon-based raw material processing, in particular to a rotary kiln. Background Art

[0002] A rotary kiln is an industrial device that achieves uniform heat and mass transfer by rotating the drum to constantly turn the material and ensure full contact with the heat source. It is widely used in high-temperature processing processes, particularly in metal ore roasting, hazardous and solid waste treatment, cement production, and renewable energy. The processing of carbon-based raw materials such as biomass and solid and hazardous waste requires simultaneous drying and baking processes. However, rotary kilns in related technologies generally only perform one function, such as drying, incineration, calcination, pyrolysis, or carbonization, making it difficult to achieve when complex process requirements are involved. Summary of the Invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, an embodiment of the present invention proposes a rotary kiln that can simultaneously realize the drying and baking processes of materials, reduce the overall length of the equipment, improve the space utilization of the equipment, and improve the heat exchange efficiency, thereby reducing the energy consumption of the rotary kiln.

[0005] According to an embodiment of the present invention, a rotary kiln includes an outer cylinder and an inner cylinder, wherein the outer cylinder is sleeved on the outside of the inner cylinder and fixedly connected to the inner cylinder, a drying chamber is defined between the outer cylinder and the inner cylinder, the outer cylinder has a head end and a tail end opposite to each other in its axial direction, the outer cylinder is provided with a raw material inlet and a gas inlet at the head end, the outer cylinder is provided with a gas outlet at the tail end, a baking chamber is defined on the inner side of the inner cylinder, the inner cylinder is provided with a feed port at an end adjacent to the tail end, the baking chamber is connected to the drying chamber through the feed port, a gaseous product outlet and a solid product outlet are provided on the inner cylinder, and the gaseous product outlet and the solid product outlet are both located on the side of the head end facing away from the tail end.

[0006] The rotary kiln of the embodiment of the present invention can simultaneously realize the drying and baking processes of the material. Compared with the rotary kiln in the related art that realizes the same residence (processing) time of the material, it can reduce the overall length of the equipment, improve the space utilization rate of the equipment, and improve the heat exchange efficiency, thereby reducing the energy consumption of the rotary kiln.

[0007] In some embodiments, the rotary kiln further includes a guide member, which is arranged on the inner side of the outer cylinder, one end of the guide member is connected to the tail end, and the other end of the guide member is adjacent to the feed port or extends into the feed port.

[0008] In some embodiments, the outer cylinder includes a first cylinder body, a fixed plate and a first rotating seal, the first cylinder body is sleeved on the outside of the inner cylinder, one end of the first cylinder body forms the tail end of the outer cylinder, the fixed plate is provided at the one end of the first cylinder body, the fixed plate is connected to the one end of the first cylinder body through the first rotating seal, the gas outlet is provided on the fixed plate, and the one end of the guide member is provided on the fixed plate.

[0009] In some embodiments, the guide member includes a guide plate and a support plate, one end of the guide plate is connected to the fixed plate, the other end of the guide plate is adjacent to the inner cylinder or is located inside the inner cylinder, the guide plate is opposite to the feed port in its axial direction, the guide plate is tilted to guide the material from the tail end to the feed port, and the support plate connects the guide plate and the fixed plate.

[0010] In some embodiments, the guide plate includes a flat plate portion and a curved plate portion, the middle portion of the guide plate is the flat plate portion, the angle between the flat plate portion and the axial direction of the first cylinder is 30°-60°, the curved plate portion is provided on both sides of the flat plate portion, the inner side of the curved plate portion is connected to the flat plate portion, the outer side of the curved plate portion is curved and raised, and the outer side of the curved plate portion and the one end of the guide plate are located in the same plane;

[0011] And / or, the one end of the guide plate and the other end of the guide plate are respectively located on both sides of the feed port in the radial direction.

[0012] In some embodiments, the outer cylinder further includes a lifting scraper, and there are multiple lifting scrapers. The multiple lifting scrapers are evenly arranged at the tail end of the outer cylinder along the circumference of the outer cylinder, and the multiple lifting scrapers surround the guide member. In the radial direction of the outer cylinder, the lifting scrapers are adjacent to the guide member.

[0013] In some embodiments, the outer cylinder further includes a feed ring, a second rotary seal, and a third rotary seal. The feed ring is provided at the other end of the first cylinder and forms the head end of the outer cylinder. The feed ring is connected to the other end of the first cylinder via the second rotary seal. The feed ring is connected to the inner cylinder via the third rotary seal. The feed ring is provided with the raw material inlet and the gas inlet.

[0014] And / or, the fixed plate is provided with the gas outlet, the outer cylinder further comprises a filter, and the filter is provided at the gas outlet;

[0015] And / or, the rotary kiln further comprises a backblower, which is provided at the gas outlet;

[0016] And / or, the outer cylinder further comprises a first guide vane, the first guide vane is spiral-shaped, and the first guide vane is arranged inside the first cylinder;

[0017] And / or, the outer cylinder further includes a heat-insulating and fire-resistant layer, and the heat-insulating and fire-resistant layer is provided on the inner side of the first cylinder.

[0018] In some embodiments, the inner cylinder includes a second cylinder body and a limiting ring, the second cylinder body is inserted into the outer cylinder, the limiting ring is provided at one end of the second cylinder body, the limiting ring is adjacent to the tail end, the side of the limiting ring facing the head end and the inner cylinder define a baking cavity, the limiting ring has a through hole and forms a feed inlet of the baking cavity.

[0019] In some embodiments, the inner cylinder further includes a fourth rotary seal and a discharge ring, the discharge ring is sleeved on the outside of the other end of the second cylinder, the discharge ring is connected to the second cylinder through the fourth rotary seal, and the gaseous product outlet and the solid product outlet are provided on the discharge ring.

[0020] In some embodiments, the inner cylinder further includes a second guide vane, which is spiral-shaped and disposed inside the second cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 1 is a schematic structural diagram of a rotary kiln according to an embodiment of the present invention;

[0022] Figure 2 1 is a schematic cross-sectional structural diagram of a rotary kiln according to an embodiment of the present invention;

[0023] Figure 3 yes Figure 2 Schematic diagram of the local enlarged structure in;

[0024] Figure 4 Schematic diagram of the structure of the tail end of the outer cylinder and the guide member according to an embodiment of the present invention.

[0025] Reference numerals:

[0026] 100, rotary kiln, 1001, drying chamber, 1002, baking chamber;

[0027] 1. Outer cylinder, 101. Raw material inlet, 102. Gas inlet, 103. Gas outlet, 11. First cylinder, 12. Fixed plate, 13. First rotary seal, 14. Lifting scraper, 15. Feed ring, 16. Second rotary seal, 17. Third rotary seal, 18. Filter, 19. First guide vane, 110. Support rod, 111. Backflush;

[0028] 2. Inner cylinder, 201. Feed inlet, 202. Gaseous product outlet, 203. Solid product outlet, 21. Second cylinder, 22. Material limiting ring, 23. Fourth rotary seal, 24. Discharge ring, 25. Second guide vane;

[0029] 3. Guide member, 31. Guide plate, 311. Flat plate portion, 312. Curved plate portion, 32. Support plate. DETAILED DESCRIPTION

[0030] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0031] Please refer to the attached Figures 1 to 4 , the rotary kiln 100 according to the embodiment of the present invention is described in detail.

[0032] The rotary kiln 100 of the embodiment of the present invention comprises an inner cylinder 2 and an outer cylinder 1. The outer cylinder 1 is sleeved on the outer side of the inner cylinder 2 and fixedly connected to the inner cylinder 2. A drying chamber 1001 is defined between the outer cylinder 1 and the inner cylinder 2. The outer cylinder 1 has opposite head ends (e.g. Figure 1 and Figure 2 The left end of the Figure 1 and Figure 2 The outer cylinder 1 is provided with a raw material inlet 101 and a gas inlet 102 at its head end, and a gas outlet 103 at its tail end. The raw material inlet 101, gas inlet 102, and gas outlet 103 are all connected to the drying chamber 1001. The inner side of the inner cylinder 2 defines a baking chamber 1002. The inner cylinder 2 is provided with a feed inlet 201 at one end adjacent to the tail end. The baking chamber 1002 is connected to the drying chamber 1001 through the feed inlet 201. The inner cylinder 2 is provided with a gaseous product outlet 202 and a solid product outlet 203. The gaseous product outlet 202 and the solid product outlet 203 are both connected to the baking chamber 1002.

[0033] The gaseous product outlet 202 and the solid product outlet 203 are both located on the side of the head end away from the tail end, such as Figure 1 As shown, the gaseous product outlet 202 and the solid product outlet 203 are both located on the left side of the head end of the outer cylinder 1 .

[0034] When the rotary kiln 100 of the embodiment of the present invention is in use, carbon-based raw materials such as wet biomass and solid hazardous waste enter the drying chamber 1001 through the raw material inlet 101, and high-temperature gas enters the drying chamber 1001 through the gas inlet 102. The high-temperature gas and the carbon-based raw materials are mixed in the drying chamber 1001. The rotating outer cylinder 1 causes the carbon-based raw materials to continuously accumulate, lift, roll, and move toward the tail end in the drying chamber 1001. The carbon-based raw materials are fully in contact with the high-temperature gas for direct heat exchange. The high-temperature gas heats the carbon-based raw materials while heating the inner cylinder 2, thereby heating the baking chamber 1002. When the carbon-based raw materials move to the tail end, the drying is completed. Most of the water vapor and low-temperature gas generated by the drying are discharged through the gas outlet 103. The dried carbon-based raw materials gradually accumulate at the second end of the outer cylinder 1. As the outer cylinder 1 continues to rotate, the accumulated carbon-based raw materials gradually increase and slide from the feed inlet 201 into the baking chamber 1002. The rotating outer cylinder 1 drives the inner cylinder 2 to rotate. The rotating inner cylinder 2 causes the dry raw materials to be continuously lifted, rolled and moved toward the other end (the end of the inner cylinder 2 adjacent to the head end) in the baking chamber 1002, and fully contact with the high-temperature inner cylinder 2 for heat exchange. During the heat exchange, baking gaseous products are precipitated. When the carbon-based raw materials move to the solid product outlet 203, the dry raw materials are baked, and the baked gaseous products are discharged from the gaseous product outlet 202, and the baked solid products are discharged from the solid product outlet 203.

[0035] The rotary kiln 100 of the embodiment of the present invention divides the interior of the rotary kiln 100 into a drying chamber 1001 located on the outside and a baking chamber 1002 located on the inside through the telescopic structure of the inner cylinder 2 and the outer cylinder 1. The drying chamber 1001 and the baking chamber 1002 are connected at the tail end of the outer cylinder 1. The outer cylinder 1 is provided with a raw material inlet 101 and the inner cylinder 2 is provided with a solid product outlet 203, thereby forming a double-return material flow path of outside-in and inside-out. At the same time, the outer cylinder 1 is provided with a gas inlet 102, and the carbon-based raw material and high-temperature gas enter the drying chamber 1001 from the outer cylinder 1. On the one hand, in the drying chamber 1001, the high-temperature gas directly contacts with the carbon-based raw material for drying, which has higher heat exchange efficiency compared with the method of indirectly heating and drying the material by heating the cylinder in the related art, thereby ensuring the drying effect of the carbon-based raw material; on the other hand, in the drying chamber 1001, the high-temperature gas also heats the inner cylinder 2, thereby heating the baking chamber 1002, and baking the dry carbon-based raw materials in the baking chamber 1002, thereby realizing the drying and baking process of the carbon-based raw materials; thirdly, it requires a large amount of heat to complete the drying of the material in the drying section, and less heat to complete the baking in the baking section. The carbon-based raw materials are first dried in the drying chamber 1001 and then baked in the baking chamber 1002. The characteristic that the baking stage does not require more heat than the drying stage is utilized, thereby making full use of the thermal energy of the high-temperature gas, and the drying chamber 1001 and the baking chamber 1002 are arranged in sections, which is conducive to separately controlling the residence time of the carbon-based raw materials in the drying chamber 1001 and the residence time in the baking chamber 1002, thereby helping to control the processing temperature of the carbon-based raw materials and ensure the drying and baking effect of the carbon-based raw materials.

[0036] The gaseous product outlet 202 and the solid product outlet 203 are both located on the left side of the head end of the outer tube 1, so that the gaseous product outlet 202 and the solid product outlet 203 will not interfere with the drying chamber 1001, and will not occupy the space inside the drying chamber 1001 due to the pipeline connection of the gaseous product outlet 202 and the solid product outlet 203. At the same time, it also facilitates the inner tube 2 to discharge solid products and exhaust products to the outside.

[0037] Therefore, the rotary kiln 100 of the embodiment of the present invention can simultaneously realize the drying and baking processes of the material. Compared with the rotary kiln 100 in the related art that realizes the same residence (processing) time of the material, the overall length of the equipment can be reduced, the space utilization rate of the equipment can be improved, and the heat exchange efficiency can be improved, thereby reducing the energy consumption of the rotary kiln 100.

[0038] In some embodiments, the inner cylinder 2 includes a second cylinder body 21 and a limiting ring 22. The second cylinder body 21 is inserted into the outer cylinder 1. A limiting ring 22 is provided at one end of the second cylinder body 21. The limiting ring 22 is adjacent to the tail end. The side of the limiting ring 22 facing the head end (i.e., the left side of the limiting ring 22) and the inner cylinder 2 define a baking cavity 1002. The limiting ring 22 has a through hole and forms a feed port 201 of the baking cavity 1002. The size of the through hole of the limiting ring 22 is smaller than the inner diameter of the second cylinder 21. The inner cylinder 2 is fed through the through hole of the limiting ring 22, thereby reducing the opening degree of the end of the second cylinder 21, reducing the exchange efficiency of the substances (carbon-based raw materials and gases) between the baking chamber 1002 and the drying chamber 1001, and helping to increase the residence time of the carbon-based raw materials in the drying chamber 1001, ensuring the drying intensity and effect of the carbon-based raw materials, and, when the carbon-based raw materials enter the baking chamber 1002 from the tail end of the outer cylinder 1 through the feed port 201, they will also occupy a certain space of the feed port 201, from The flow of gas between the drying chamber 1001 and the baking chamber 1002 through the feed port 201 is further reduced, thereby reducing the low-temperature gas formed after the heat exchange between water vapor and high-temperature gas entering the baking chamber 1002, and also reducing the gaseous products generated in the baking chamber 1002 during the baking of carbon-based raw materials from flowing from the feed port 201 to the drying chamber 1001, thereby facilitating the separate discharge of the gaseous products generated in the baking chamber 1002 and the water vapor and low-temperature gas generated in the drying chamber 1001, thereby ensuring that the calorific value of the gaseous products is not lost and facilitating the reuse of the gaseous products.

[0039] In some embodiments, the rotary kiln 100 further includes a guide member 3, which is disposed on the inner side of the outer cylinder 1, with one end of the guide member 3 connected to the tail end, and the other end of the guide member 3 adjacent to the feed port 201 or extending into the feed port 201. The guide member 3 protrudes from the tail end of the outer cylinder 1. As the outer cylinder 1 rotates, the carbon-based raw material at the tail end flips and falls, and the carbon-based raw material that falls onto the guide member 3 flows along the guide member 3 to the feed port 201 or into the feed port 201, thereby ensuring that the carbon-based raw material enters the baking chamber 1002 and ensures smooth flow of the carbon-based raw material from the drying chamber 1001 to the baking chamber 1002.

[0040] Furthermore, the outer cylinder 1 includes a first cylinder 11, a fixed plate 12 and a first rotating seal 13. The first cylinder 11 is mounted on the outside of the inner cylinder 2. Specifically, a rotating support component is provided on the outside of the first cylinder 11, and the rotating support component is used to drive the first cylinder 11 to rotate. The second cylinder 21 is mounted on the inside of the first cylinder 11, and a plurality of support rods 110 are provided on the inside of the first cylinder 11. The support rods 110 connect the first cylinder 11 and the second cylinder 21 to ensure that the second cylinder 21 and the first cylinder 11 are fixed and rotate synchronously. One end of the first cylinder 11 forms the tail end of the outer cylinder 1, and the fixed plate 12 is provided at this end of the first cylinder 11. The fixed plate 12 is connected to one end of the first cylinder 11 through the first rotating seal 13. A gas outlet 103 is provided on the fixed plate 12, and one end of the guide member 3 is provided on the fixed plate 12.

[0041] The fixed plate 12 is connected to the first cylinder 11 through the first rotating seal 13, so that when the first cylinder 11 rotates, the fixed plate 12 does not rotate, so that the gas outlet 103 on the fixed plate 12 is connected to the external pipeline, which is convenient for the collection and reprocessing of water vapor and low-temperature gas. At the same time, the guide member 3 does not rotate either. The guide member 3 remains stationary, not only continuously guiding the carbon-based raw materials falling from above to ensure that the carbon-based raw materials enter the baking chamber 1002, but also ensuring the sealing performance of the drying chamber 1001.

[0042] The outer cylinder 1 further includes a feed ring 15, a second rotary seal 16, and a third rotary seal 17. The feed ring 15 is located at the other end (left end) of the first cylinder 11 and forms the head end of the outer cylinder 1. The feed ring 15 is connected to the other end of the first cylinder 11 via the second rotary seal 16. The feed ring 15 is connected to the second cylinder 21 of the inner cylinder 2 via the third rotary seal 17. The feed ring 15 is provided with a raw material inlet 101 and a gas inlet 102. Therefore, when the first cylinder 11 rotates, the feed ring 15 does not rotate, thereby facilitating the communication between the raw material inlet 101 on the feed ring 15 and external equipment, and the communication between the gas inlet 102 and external pipelines, while ensuring the sealing performance of the drying chamber 1001.

[0043] The outer cylinder 1 further includes an insulating refractory layer disposed on the inner side of the first cylinder 11. This insulating refractory layer facilitates heat preservation of the first cylinder 11, helps reduce heat flow and loss to the outside, and reduces the energy consumption of the rotary kiln 100 of the embodiment of the present invention. It should be noted that the second cylinder 21 is not provided with insulating refractory material on either the outer or inner sides. This facilitates the transfer of heat from the high-temperature gas in the drying chamber 1001 to the second cylinder 21, heating the baking chamber 1002, and thereby baking the carbon-based feedstock in the baking chamber 1002.

[0044] The outer cylinder 1 further includes a first guide vane 19, which is spirally shaped and disposed inside the first cylinder 11. As the first cylinder 11 rotates, the first guide vane 19 can lift and tumble the carbon-based feedstock from the bottom of the first cylinder 11, not only pushing the carbon-based feedstock from the head end to the tail end but also facilitating sufficient contact and heat exchange between the feedstock and the high-temperature gas.

[0045] Specifically, the angle between the first guide vane 19 and the axial direction of the first cylinder 11 is 30°-60°. The angle between the first guide vane 19 and the axial direction of the first cylinder 11 is related to the frequency of material turnover by the first guide vane 19, affecting the speed at which the material moves from the head end to the tail end, that is, affecting the residence time of the material within the drying chamber 1001. Therefore, based on the properties of the material, such as the moisture content, the required drying time of the material is determined, and the corresponding angle between the first guide vane 19 and the axial direction of the first cylinder 11 of the rotary kiln 100 is selected to ensure the rotary kiln 100's drying effect on the material.

[0046] For example, the angle between the first guide plate 19 and the axial direction of the first cylinder 11 is 30°, 35°, 40°, 41°, 42°, 43°, 44°, 45°, 46°, 47°, 48°, 49°, 45°, 50°, 55° or 60°.

[0047] like Figures 2 to 4 As shown, the outer cylinder 1 further includes a plurality of lifting scrapers 14, which are evenly arranged along the circumference of the outer cylinder 1 at the rear end of the first cylinder body 11 of the outer cylinder 1. The plurality of lifting scrapers 14 surround the guide member 3, and in the radial direction of the outer cylinder 1, the lifting scrapers 14 are adjacent to the guide member 3. As the first cylinder body 11 rotates, the lifting scrapers 14 can lift the dried carbon-based raw material at the rear end of the drying chamber 1001 above the turning guide member 3, so that the dried carbon-based raw material falls onto the guide member 3 through the action of gravity, ensuring smooth flow of the carbon-based raw material from the drying chamber 1001 to the baking chamber 1002.

[0048] Specifically, the lifting scraper 14 is connected to the end (the end adjacent to the tail end) of the first guide vane 19. The radial dimension of the lifting scraper 14 is larger than the radial dimension of the first guide vane 19. The extension direction of the lifting scraper 14 is parallel to the axial direction of the first barrel 11. The plurality of lifting scrapers 14 surround the guide member 3, thereby increasing the probability that material flipped by the lifting scraper 14 to the upper side of the guide member 3 will fall onto the guide member 3.

[0049] Furthermore, the guide member 3 includes a guide plate 31 and a support plate 32. One end (the right end) of the guide plate 31 is connected to the fixed plate 12, while the other end (the left end) of the guide plate 31 is adjacent to or located within the inner cylinder 2. The guide plate 31 is axially opposed to the feed inlet 201 and is tilted to guide the material from the rear end to the feed inlet 201. The support plate 32 connects the guide plate 31 and the fixed plate 12. Specifically, the height of the one end of the guide plate 31 is higher than the height of the other end. The upper side of the guide plate 31 receives the material, which slides down to the other end of the guide plate 31 under the action of gravity and then enters the baking chamber 1002 through the feed inlet 201. The lower side of the guide plate 31 is supported and fixed by the support plate 32, so that at least a portion of the lower side of the guide plate 31 is spaced apart from the fixed plate 12, ensuring unobstructed access to the gas outlet 103 on the fixed plate 12.

[0050] The guide member 3 has a simple structure and is easy to manufacture and install, which helps to reduce the manufacturing cost of the rotary kiln 100 according to the embodiment of the present invention.

[0051] Specifically, the other end of the guide plate 31 is adjacent to the limiting ring 22. The guide plate 31 and the feed port 201 are opposite in their axial direction (which is also the axial direction of the first cylinder 11 and the second cylinder 21). One end of the guide plate 31 and the other end of the guide plate 31 are respectively located on both sides of the feed port 201 in its radial direction, that is, the other end of the guide plate 31 is located on the lower side of the feed port 201, and the one end of the guide plate 31 is located on the upper side of the feed port 201. The limiting ring 22 and the guide plate 31 form a bucket-shaped space, which also facilitates the accumulation of materials on the guide plate 31. The accumulated materials form a sealed buffer zone for the feed port 201, further reducing the exchange of gas between the drying chamber 1001 and the baking chamber 1002 through the feed port 201, preventing the gaseous products in the baking chamber 1002 from escaping to the gas outlet 103, and preventing the water vapor and low-temperature gas in the drying chamber 1001 from escaping to the baking chamber 1002, further ensuring that the calorific value of the gaseous products is not reduced, and further facilitating the reuse of the gaseous products.

[0052] Further, such as Figure 4As shown, the guide plate 31 includes a flat portion 311 and a curved portion 312. The flat portion 311 is located in the middle of the guide plate 31. The angle between the flat portion 311 and the axis of the first cylinder 11 is 45°-60°. Curved portions 312 are located on either side of the flat portion 311. The inner side of the curved portion 312 is connected to the flat portion 311. The outer side of the curved portion 312 is curved and tilted. The outer side of the curved portion 312 is coplanar with one end of the guide plate 31. Thus, the flat portion 311 and the curved portions 312 on either side of the flat portion 311 form a chute, thereby further ensuring that the dry carbon-based raw material that falls onto the guide plate 31 does not fall back to the lower portion of the first cylinder 11. This further facilitates the accumulation of the material between the guide plate 31 and the retaining ring, further reduces the exchange of gas between the drying chamber 1001 and the baking chamber 1002 through the feed inlet 201, further ensures that the calorific value of the gaseous product is not reduced, and further facilitates the reuse of the gaseous product.

[0053] Specifically, the angle between the flat plate portion 311 and the axial direction of the first cylinder 11 is 30°, 31°, 32°, 33°, 34°, 35°, 36°, 37°, 38°, 39°, 40°, 41°, 42°, 43°, 44°, 45°, 46°, 47°, 48°, 49°, 50°, 51°, 52°, 53°, 54°, 55°, 56°, 57°, 58°, 59°, or 60°.

[0054] Specifically, the fixed plate 12 is provided with a gas outlet 103, and the outer cylinder 1 further includes a filter 18, which is provided at the gas outlet 103. The filter 18 can prevent fine dry raw materials from being carried into the gas outlet 103 by the low-temperature gas, thereby avoiding material loss.

[0055] Specifically, the mesh diameter of the filter 18 is 0.1-10 mm.

[0056] The rotary kiln 100 further includes a backblower 111 disposed at the gas outlet 103. Specifically, the backblower 111 is disposed outside the filter 18. Regular backblowing can remove dry material from the gaps in the filter 18, prevent clogging of the filter 18, and ensure that gas can be discharged smoothly from the gas outlet 103.

[0057] The inner cylinder 2 further includes a second helical guide vane 25, which is located inside the second cylinder 21. The rotation direction of the second guide vane 25 is opposite to that of the first guide vane 19. As the second cylinder 21 rotates, the second guide vane 25 can lift and tumble the carbon-based feedstock from the bottom of the second cylinder 21. This not only pushes the carbon-based feedstock from one end to the other of the second cylinder 21, but also facilitates sufficient contact and heat exchange between the feedstock and the second cylinder 21.

[0058] Specifically, the angle between the second guide plate 25 and the axial direction of the second cylinder 21 is 30°-60°. According to the properties of the material, such as the moisture content, the time required for baking the material is judged, and the angle between the second guide plate 25 and the axial direction of the second cylinder 21 of the corresponding rotary kiln 100 is selected to ensure the baking effect of the rotary kiln 100 on the material.

[0059] For example, the angle between the second guide plate 25 and the axial direction of the second cylinder 21 is 30°, 35°, 40°, 41°, 42°, 43°, 44°, 45°, 46°, 47°, 48°, 49°, 45°, 50°, 55° or 60°.

[0060] In some embodiments, the inner cylinder 2 further includes a fourth rotary seal 23 and a discharge ring 24. The discharge ring 24 is mounted on the outer side of the other end of the second cylinder 21. The discharge ring 24 is connected to the second cylinder 21 via the fourth rotary seal 23. The discharge ring 24 is provided with a gaseous product outlet 202 and a solid product outlet 203. The discharge ring 24 is connected to the second cylinder 21 via the fourth rotary seal 23. Therefore, when the second cylinder 21 rotates, the discharge ring 24 does not rotate, thereby facilitating communication between the solid product outlet 203 on the discharge ring 24 and external equipment, and between the gaseous product outlet 202 and external pipelines, while ensuring the sealing performance of the baking chamber 1002.

[0061] Specifically, the discharge ring 24 and the feed ring 15 are fixedly connected, and the fourth rotary seal 23 and the third rotary seal 17 are the same rotary seal.

[0062] Specifically, the first rotary seal 13 , the second rotary seal 16 , and the third rotary seal 17 (the fourth rotary seal 23 ) are all sealed bearings.

[0063] The rotary kiln 100 of the embodiment of the present invention further includes a first pressure sensor and a second pressure sensor. The detection contact of the first pressure sensor is arranged at the gas outlet 103, and the detection contact of the second pressure sensor is arranged at the feed port 201, so as to detect the pressure of the gas outlet 103 and the pressure of the feed port 201, thereby assisting personnel in judging the gas flow conditions in the rotary kiln 100, thereby adjusting the rotation speed of the rotary kiln 100, the intake pressure and flow rate of the high-temperature gas to ensure the best drying and baking operation effects.

[0064] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0065] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0066] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0067] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0068] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0069] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A rotary kiln (100), characterized in that: The invention comprises an outer cylinder (1) and an inner cylinder (2), wherein the outer cylinder (1) is sleeved on the outer side of the inner cylinder (2) and fixedly connected to the inner cylinder (2), a drying chamber is defined between the outer cylinder (1) and the inner cylinder (2), the outer cylinder (1) has a head end and a tail end opposite to each other in its axial direction, the outer cylinder (1) is provided with a raw material inlet (101) and a gas inlet (102) at the head end, the outer cylinder (1) is provided with a gas outlet (103) at the tail end, a baking chamber is defined on the inner side of the inner cylinder (2), the inner cylinder (2) is provided with a feed port (201) at one end adjacent to the tail end, the baking chamber and the drying chamber are communicated through the feed port (201), the inner cylinder (2) is provided with a gaseous product outlet (202) and a solid product outlet (203), and the gaseous product outlet (202) and the solid product outlet (203) are both located on the side of the head end facing away from the tail end.

2. The rotary kiln (100) according to claim 1, characterized in that It further includes a guide member (3), which is arranged on the inner side of the outer cylinder (1), one end of the guide member (3) is connected to the tail end, and the other end of the guide member (3) is adjacent to the feed port (201) or extends into the feed port (201).

3. The rotary kiln (100) according to claim 2, characterized in that The outer cylinder (1) comprises a first cylinder (11), a fixed plate (12) and a first rotating seal (13); the first cylinder (11) is sleeved on the outer side of the inner cylinder (2); one end of the first cylinder (11) forms the tail end of the outer cylinder (1); the fixed plate (12) is arranged at the one end of the first cylinder (11); the fixed plate (12) is connected to the one end of the first cylinder (11) through the first rotating seal (13); the gas outlet (103) is provided on the fixed plate (12); and the one end of the guide member (3) is arranged on the fixed plate (12).

4. The rotary kiln (100) according to claim 3, characterized in that The guide member (3) includes a guide plate (31) and a support plate (32), one end of the guide plate (31) is connected to the fixed plate (12), the other end of the guide plate (31) is adjacent to the inner cylinder (2) or located inside the inner cylinder (2), the guide plate (31) and the feed port (201) are opposite in their axial direction, the guide plate (31) is tilted to guide the material from the tail end to the feed port (201), and the support plate (32) connects the guide plate (31) and the fixed plate (12).

5. The rotary kiln (100) according to claim 4, characterized in that The guide plate (31) includes a flat plate portion (311) and a curved plate portion (312), the middle portion of the guide plate (31) is the flat plate portion (311), the angle between the flat plate portion (311) and the axial direction of the first cylinder (11) is 30°-60°, the curved plate portion (312) is provided on both sides of the flat plate portion (311), the inner side of the curved plate portion (312) is connected to the flat plate portion (311), the outer side of the curved plate portion (312) is curved and raised, and the outer side of the curved plate portion (312) and the one end of the guide plate (31) are located in the same plane; And / or, the one end of the guide plate (31) and the other end of the guide plate (31) are respectively located on both sides of the feed port (201) in the radial direction.

6. The rotary kiln (100) according to claim 3, characterized in that The outer cylinder (1) further includes a lifting scraper (14), and the lifting scraper (14) is provided in plurality. The plurality of lifting scrapers (14) are evenly arranged at the tail end of the outer cylinder (1) along the circumference of the outer cylinder (1), and the plurality of lifting scrapers (14) surround the guide member (3). In the radial direction of the outer cylinder (1), the lifting scraper (14) is adjacent to the guide member (3).

7. The rotary kiln (100) according to claim 3, characterized in that The outer cylinder (1) further comprises a feed ring (15), a second rotary seal (16) and a third rotary seal (17); the feed ring (15) is provided at the other end of the first cylinder (11) and forms the head end of the outer cylinder (1); the feed ring (15) is connected to the other end of the first cylinder (11) via the second rotary seal (16); the feed ring (15) is connected to the inner cylinder (2) via the third rotary seal (17); the feed ring (15) is provided with the raw material inlet (101) and the gas inlet (102); And / or, the fixed plate (12) is provided with the gas outlet (103), the outer cylinder (1) further comprises a filter (18), and the filter (18) is provided at the gas outlet (103); And / or, the rotary kiln (100) further comprises a backblower (111), and the backblower (111) is provided at the gas outlet (103); And / or, the outer cylinder (1) further comprises a first guide plate (19), the first guide plate (19) is spiral-shaped, and the first guide plate (19) is arranged on the inner side of the first cylinder (11); And / or, the outer cylinder (1) further comprises a heat-insulating refractory layer, and the heat-insulating refractory layer is provided on the inner side of the first cylinder (11).

8. The rotary kiln (100) according to claim 1, characterized in that The inner cylinder (2) comprises a second cylinder body (21) and a material limiting ring (22), wherein the second cylinder body (21) is sleeved in the outer cylinder (1), and the material limiting ring (22) is provided at one end of the second cylinder body (21), wherein the material limiting ring (22) is adjacent to the tail end, and a baking cavity is defined by the side of the material limiting ring (22) facing the head end and the inner cylinder (2), wherein the material limiting ring (22) has a through hole and forms a material inlet (201) of the baking cavity.

9. The rotary kiln (100) according to claim 8, characterized in that The inner cylinder (2) further includes a fourth rotating seal (23) and a discharge ring (24), wherein the discharge ring (24) is sleeved on the outer side of the other end of the second cylinder (21), and the discharge ring (24) is connected to the second cylinder (21) through the fourth rotating seal (23), and the discharge ring (24) is provided with the gaseous product outlet (202) and the solid product outlet (203).

10. The rotary kiln (100) according to claim 9, characterized in that The inner cylinder (2) further comprises a second guide plate (25), the second guide plate (25) being spiral-shaped and arranged on the inner side of the second cylinder (21).

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