rotary kiln

Abstract

The application relates to the technical field of thermal desorption treatment equipment, and discloses a rotary kiln which comprises a rotating drum and a plurality of scraper assemblies. The rotating drum is internally provided with a cavity, and the scraper assembly comprises a main plate, a first auxiliary plate, a second auxiliary plate and a guide plate. The main plate is arranged on the inner wall of the rotating drum and extends along the radial direction of the rotating drum. One end of the first auxiliary plate is connected to one side of the main plate along the length direction. The second auxiliary plate has opposite first and second ends along the length direction. The first end is connected to the opposite side of the main plate, and the second end is connected to one end of the guide plate along the length direction, so that an obtuse angle is formed between the plate surface of the guide plate and the plate surface of the second auxiliary plate, and the obtuse angle faces the main plate. In the rotating direction of the rotating drum, the first auxiliary plate is arranged upstream of the second auxiliary plate. The rotary kiln provided by the application guides the material to a high position to complete initial throwing by the first auxiliary plate. After that, the material falls into the main plate, is subjected to secondary flow guiding, and then enters the second auxiliary plate and the guide plate, and finally forms an umbrella-shaped material curtain. The material is uniformly thrown, and the gas-solid contact efficiency is relatively high.

Description

Technical Field

[0001] This application relates to the technical field of thermal desorption treatment equipment, specifically to rotary kilns. Background Technology

[0002] A rotary kiln is a device that uses its own rotation to transfer heat between the walls of the materials inside, and it is widely used in chemical production. For example, it is used as a reactor for gas-solid phase reactions in the activation reactions of activated carbon or porous carbon. Its core process objectives are high-efficiency heat transfer and uniform gas-solid contact. Rotary kilns are usually equipped with lifting plates inside. As the drum rotates, the lifting plates stir, lift, and drop the materials inside the drum, ensuring that the materials are heated evenly and that components are thoroughly removed.

[0003] Existing lifting plates are generally fixed radially on the inner wall of the rotating drum, and multiple plates are set along the circumference of the rotating drum. After the material is lifted by the lifting plate, it is only distributed on one side of the lifting plate. A large amount of material tends to accumulate at the bottom of the rotating drum and cannot make sufficient contact with the inner wall of the rotating drum. This results in problems such as insufficient material distribution, low gas-solid contact efficiency, and poor activation uniformity. Utility Model Content

[0004] This application provides a rotary kiln to solve the problems in existing rotary kilns where, after the material is lifted by the lifting plates, it is only distributed on one side of the lifting plates, and the material tends to accumulate at the bottom of the drum, resulting in insufficient material distribution, low gas-solid contact efficiency, and poor activation uniformity.

[0005] In a first aspect, this application provides a rotary kiln, comprising:

[0006] Rotating drum with an internal cavity;

[0007] Multiple lifting plate assemblies are spaced apart on the inner wall of the rotating drum. Each lifting plate assembly includes a main plate, a first sub-plate, a second sub-plate, and a guide plate. The main plate is disposed on the inner wall of the rotating drum and extends radially along the rotating drum. One end of the first sub-plate along its length is connected to one side of the main plate. The second sub-plate has a first end and a second end opposite each other along its length. The first end is connected to the opposite side of the main plate, and the second end is connected to one end of the guide plate along its length, so that an obtuse angle is formed between the surface of the guide plate and the surface of the second sub-plate, with the obtuse angle facing the main plate.

[0008] Along the rotation direction of the rotating drum, the first sub-plate is located upstream of the second sub-plate.

[0009] In one optional implementation, the length of the main board is L1 and the diameter of the rotating drum is D1, satisfying 0.1≤L1 / D1≤0.125, 10mm≤L1≤125mm, and 100mm≤D1≤1000mm.

[0010] In one optional embodiment, the arc length of the rotating drum between adjacent main boards is L5, satisfying 1≤L5 / L1≤3.

[0011] In one alternative implementation, the length of the first subplate is L2, satisfying 0.3≤L2 / L1≤0.8.

[0012] In one alternative implementation, the length of the second sub-plate is L3, satisfying 1.15≤L3 / L1≤2.

[0013] In one optional embodiment, the length of the guide plate is L4, satisfying 0.5≤L4 / L1≤1.

[0014] In one optional implementation, the surface of the motherboard and the surface of the first sub-board form a first included angle θ1, satisfying 30°≤θ1≤60°.

[0015] In one optional embodiment, a second included angle θ2 is formed between the surface of the motherboard and the surface of the second subboard, satisfying 30°≤θ2≤60°.

[0016] In one optional embodiment, the obtuse angle formed between the surface of the guide plate and the surface of the second sub-plate is θ3, satisfying 100°≤θ3≤150°.

[0017] In one alternative embodiment, the surface of the motherboard has a dividing line located at the middle position along the radial direction of the rotating cylinder;

[0018] The connection point between the first sub-board and the main board is located between the dividing line and the connection point between the main board and the rotating cylinder;

[0019] And / or, the connection point between the second sub-plate and the main plate is located between the dividing line and the connection point between the main plate and the rotating cylinder.

[0020] In one alternative implementation, the connection point between the first sub-board and the main board is located at the bottom of the main board;

[0021] And / or, the connection point between the second sub-board and the main board is located at the bottom of the main board.

[0022] The technical solution of this application has the following advantages:

[0023] 1. During the rotation of the drum, both the main plate and the first auxiliary plate can scoop up material from the bottom of the drum and throw it into the drum and into the gas phase space. When the first auxiliary plate rotates to a certain height, the material on the first auxiliary plate is thrown onto the main plate. The material is then guided along the main plate and falls into the second auxiliary plate. It then flows along the second auxiliary plate to the guide plate. Because the angle between the second auxiliary plate and the guide plate is obtuse, the downward speed of the material is slowed down, thereby extending the gas-solid contact time. Finally, the material falls from the guide plate and forms an umbrella-shaped material curtain. The material is evenly thrown, and the gas-solid contact efficiency is high, which is beneficial to improving the uniformity of activation. The material undergoes multiple stages of lifting and throwing, which prolongs the contact time between the material and the lifting plate assembly and also improves the heat exchange efficiency.

[0024] 2. By controlling L1 / D1 within a suitable range, the gas-solid contact time can be extended. If the value of L1 / D1 is too large, the main board will be too long and the material residence time will be too long. If the value of L1 / D1 is too small, the main board will have difficulty effectively driving the material, and the material will easily accumulate at the bottom of the rotating drum.

[0025] 3. By controlling L5 / L1 within a suitable range, the number of lifting plate components installed inside the rotating drum can be indirectly controlled, so that the material can be lifted and scattered more frequently by multiple lifting plate components, thereby further improving the uniformity of scattering.

[0026] 4. By controlling the length ratio of the first sub-plate, the second sub-plate, and the guide plate to the main plate within a suitable range, the gas-solid contact time can be further extended, the uniformity of material distribution can be improved, and the material can be ensured to complete the initial distribution within the first sub-plate and then be distributed to the main plate at a certain height, finally falling from the guide plate and forming an umbrella-shaped material curtain.

[0027] 5. By controlling the included angles between the first and second sub-plates and the main plate, as well as the obtuse angle between the second sub-plate and the guide plate, within a suitable range, the scraping ability of the lifting plate assembly can be improved, and the material can be ensured to have sufficient residence time on the lifting plate assembly, thereby improving gas-solid contact efficiency and optimizing activation uniformity. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of the rotary kiln according to an embodiment of this application;

[0030] Figure 2This is a schematic diagram of the structure of the scraper assembly of the rotary kiln in an embodiment of this application.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Rotary drum; 2. Plate lifting assembly; 201. Main board; 202. First auxiliary board; 203. Second auxiliary board; 204. Guide plate. Detailed Implementation

[0033] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0035] In the description of the embodiments in this application, "a plurality of" means two or more, unless otherwise expressly specified. The reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0036] The "range" disclosed in this application is defined by a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, which define the boundaries of a particular range. Ranges defined in this way can include or exclude endpoints and can be arbitrarily combined; that is, any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60-120 and 80-110 are listed for a specific parameter, it is expected that ranges of 60-110 and 80-120 are also included. Furthermore, if minimum range values ​​of 1 and 2 are listed, and if maximum range values ​​of 3, 4, and 5 are listed, then the following ranges are all expected: 1-3, 1-4, 1-5, 2-3, 2-4, and 2-5. In this application, unless otherwise stated, the numerical range "ab" represents a shortened representation of any combination of real numbers between a and b, where a and b are real numbers. For example, the numerical range "0-5" indicates that all real numbers between "0-5" have been listed in this article; "0-5" is simply a shortened representation of these numerical combinations. Furthermore, when a parameter is stated as an integer ≥2, it is equivalent to disclosing that the parameter is, for example, an integer such as 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0037] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0038] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0039] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms "installation," "connection," "joining," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0040] According to embodiments of this application, such as Figure 1 As shown, a rotary kiln is provided, mainly comprising: a rotary drum 1 and multiple lifting plate assemblies 2. The rotary drum 1 has an internal cavity. Multiple lifting plate assemblies 2 are spaced apart on the inner wall of the rotary drum 1. Each lifting plate assembly 2 includes a main plate 201, a first auxiliary plate 202, a second auxiliary plate 203, and a guide plate 204. The main plate 201 is disposed on the inner wall of the rotary drum 1 and extends radially along the rotary drum 1. One end of the first auxiliary plate 202 along its length is connected to one side of the main plate 201. The second auxiliary plate 203 has a first end and a second end along its length. The first end is connected to the opposite side of the main plate 201, and the second end is connected to one end of the guide plate 204 along its length, so that the surface of the guide plate 204 and the surface of the second auxiliary plate 203 form an obtuse angle, with the obtuse angle facing the main plate 201. Along the rotation direction of the rotary drum 1, the first auxiliary plate 202 is located upstream of the second auxiliary plate 203.

[0041] In the rotary kiln provided in this embodiment, during the rotation of the drum 1, both the main plate 201 and the first auxiliary plate 202 can scoop up material from the bottom of the drum 1 and throw the material into the drum 1 and into the gas phase space. When the first auxiliary plate 202 rotates to a certain height, the material on the first auxiliary plate 202 is thrown onto the main plate 201. The material is then guided a second time along the main plate 201 and falls into the second auxiliary plate 203. Afterward, it flows along the second auxiliary plate 203 to the guide plate 204. Since the angle between the second auxiliary plate 203 and the guide plate 204 is obtuse, the downward speed of the material can be slowed down, thereby extending the gas-solid contact time. Finally, the material falls from the guide plate 204 and forms an umbrella-shaped material curtain. The material is evenly thrown, the gas-solid contact efficiency is high, and it is beneficial to improve the activation uniformity. The material undergoes multi-stage stepped lifting and throwing, which prolongs the contact time between the material and the lifting plate assembly 2 and also improves the heat exchange efficiency.

[0042] Specifically, the first auxiliary plate 202, the main plate 201, and the second auxiliary plate 203 can respectively lift the material to different heights and scatter it, forming a three-stage stepped material throwing structure. The first auxiliary plate 202 being located upstream of the second auxiliary plate 203 means that when the rotating drum 1 rotates, the first auxiliary plate 202 is located in front of the second auxiliary plate 203, for example, as... Figure 1 As shown, the rotating drum 1 rotates counterclockwise, in the following direction: Figure 1 As indicated by arrow X. At this time, the first sub-plate 202 is located to the right of the main plate 201, and the second sub-plate 203 is located to the left of the main plate 201. The first sub-plate 202 passes through the bottom of the rotating drum 1 first and drives the material to rise.

[0043] In one alternative implementation, such as Figure 1 and Figure 2As shown, the length of the main board 201 is L1, and the diameter of the rotating drum 1 is D1, satisfying 0.1≤L1 / D1≤0.125, 10mm≤L1≤125mm, and 100mm≤D1≤1000mm. By controlling the ratio of the length of the main board 201 to the diameter of the rotating drum 1, L1 / D1, within a suitable range, it can be ensured that the main board 201 has sufficient length to carry the material and extend the gas-solid contact time. If the value of L1 / D1 is too large, the main board 201 will be too long, and the material residence time will be too long. If the value of L1 / D1 is too small, the main board 201 will be unable to effectively move the material, and the material will easily accumulate at the bottom of the rotating drum 1.

[0044] For example, in this embodiment of the present invention, the value of L1 / D1 can be 0.1, 0.115, 0.125, etc.

[0045] Furthermore, in an optional embodiment, the arc length of the rotating drum 1 between adjacent main boards 201 is L5, satisfying 1≤L5 / L1≤3 and 10mm≤L5≤375mm.

[0046] It should be noted that the lifting plate components 2 are evenly arranged along the circumference of the rotating drum 1. The number of lifting plate components 2 is positively correlated with the diameter of the rotating drum 1. When the diameter of the rotating drum 1 increases, in order to ensure that the material can be lifted evenly, the number of lifting plate components 2 needs to be increased at the same time. In this application, the diameter of the rotating drum 1 is related to the length of the main board 201. Therefore, by controlling L5 / L1 within a suitable range, the number of lifting plate components 2 set in the rotating drum 1 can be indirectly controlled so that the material can be lifted and scattered more frequently by multiple lifting plate components 2, thereby further improving the uniformity of scattering.

[0047] In one alternative implementation, such as Figure 2 As shown, the length of the first sub-plate 202 is L2, satisfying 0.3≤L2 / L1≤0.8 and 3mm≤L2≤100mm. By controlling the ratio of the length of the first sub-plate 202 to the length of the main plate 201 within a suitable range, it can be ensured that the material is first lifted by the first sub-plate 202 for initial throwing, and after rising to a certain height, the material is thrown towards the main plate 201, thus forming a stepped throwing.

[0048] For example, in this embodiment of the present invention, the value of L2 / L1 can be 0.3, 0.4, 0.5, 0.6, 0.8, etc.

[0049] In one alternative implementation, such as Figure 2As shown, the length of the second auxiliary plate 203 is L3, satisfying 1.15≤L3 / L1≤2 and 11.5mm≤L3≤250mm. By controlling the ratio of the length of the second auxiliary plate 203 to the length of the main plate 201 within a suitable range, it can be ensured that the material falls from the main plate 201 to the second auxiliary plate 203 and stays between the second auxiliary plate 203 and the guide plate 204 for a certain period of time, thus prolonging the gas-solid contact time and further improving the uniformity of material distribution.

[0050] For example, in this embodiment of the present invention, the value of L3 / L1 can be 1.15, 1.3, 1.5, 1.8, 2, etc.

[0051] In one alternative implementation, such as Figure 2 As shown, the length of the guide plate 204 is L4, satisfying 0.5≤L4 / L1≤1 and 5mm≤L4≤125mm. By controlling the length ratio of the guide plate 204 to the main plate 201 within a suitable range, it can be ensured that the guide plate 204 has sufficient length to carry the material, further extending the gas-solid contact time and improving the uniformity of material distribution.

[0052] For example, in this embodiment of the present invention, the value of L4 / L1 can be 0.5, 0.6, 0.8, 1, etc.

[0053] In one alternative implementation, such as Figure 2 As shown, the surface of the motherboard 201 and the surface of the first sub-board 202 form a first included angle θ1, which satisfies 30°≤θ1≤60°.

[0054] In one alternative implementation, such as Figure 2 As shown, a second included angle θ2 is formed between the surface of the main board 201 and the surface of the second sub-board 203, satisfying 30°≤θ2≤60°.

[0055] In one alternative implementation, such as Figure 2 As shown, the obtuse angle formed between the surface of the guide plate 204 and the surface of the second auxiliary plate 203 is θ3, which satisfies 100°≤θ3≤150°.

[0056] By controlling the included angles between the first sub-plate 202, the second sub-plate 203 and the main plate 201, and the obtuse angle between the second sub-plate 203 and the guide plate 204 within a suitable range, the scraping ability of the lifting plate assembly 2 on the material can be improved, and the material can be ensured to have sufficient residence time on the lifting plate assembly 2, forming a multi-stage stepped material throwing, so as to further improve the gas-solid contact efficiency and optimize the activation uniformity.

[0057] In one optional embodiment, the main board 201 has a dividing line located at the center along the radial direction of the rotating drum 1. The connection point between the first sub-board 202 and the main board 201 is located between the dividing line and the connection point between the main board 201 and the rotating drum 1. And / or, the connection point between the second sub-board 203 and the main board 201 is located between the dividing line and the connection point between the main board 201 and the rotating drum 1. This facilitates processing and helps reduce manufacturing costs.

[0058] Furthermore, in an optional embodiment, the connection point between the first sub-board 202 and the main board 201 is located at the bottom of the main board 201.

[0059] And / or, the connection point between the second sub-board 203 and the main board 201 is located at the bottom of the main board 201.

[0060] The first sub-board 202 and the second sub-board 203 are respectively located on opposite sides of the base plate of the main board 201. On the one hand, this facilitates the connection between the first sub-board 202, the second sub-board 203 and the main board 201. On the other hand, it can make full use of the space between the first sub-board 202 and the main board 201 to store materials, as well as the space between the main board 201 and the second sub-board 203 to store materials, thereby improving work efficiency.

[0061] The working principle of this utility model embodiment is as follows:

[0062] Taking the physical activation preparation of activated carbon or porous carbon using a rotary kiln as an example, the rotary drum 1 rotates counterclockwise, and the material is driven upward by the lifting plate assembly 2. Part of the material is initially driven upward by the first auxiliary plate 202, and part by the main plate 201. As the rotary drum 1 rotates, the position of the first auxiliary plate 202 continuously rises, and the material is gradually thrown from the first auxiliary plate 202 into the rotary drum 1 and enters the gas phase space. As the material continues to rise, the material on the main plate 201 also begins to be thrown into the rotary drum 1 and enters the gas phase space. When the material on the first auxiliary plate 202 rises to a certain height, it begins to be thrown onto the main plate 201, which then throws the material onto the second auxiliary plate 203. The material then enters the guide plate 204 along the second auxiliary plate 203. The rotary drum 1 continues to rotate, and the material is scattered from the end of the guide plate 204 at an obtuse angle into the rotary drum 1, forming an umbrella-shaped material curtain covering the cross-section of the rotary drum 1.

[0063] The rotary kiln of the present application is described in further detail below with reference to specific examples. These examples should not be construed as limiting the scope of protection claimed in this application.

[0064] Example 1:

[0065] The diameter D1 of the rotating drum 1 is 300mm, the length L1 of the main plate 201 is 30mm, the length L2 of the first auxiliary plate 202 is 20mm, the length L3 of the second auxiliary plate 203 is 40mm, and the length L4 of the guide plate 204 is 20mm. Therefore, L1 / D1 is 0.1, L2 / L1 is 0.67, L3 / L1 is 1.33, and L4 / L1 is 0.67. Fourteen lifting plate assemblies 2 are evenly arranged along the circumference of the rotating drum 1. The first included angle θ1 between the surface of the main plate 201 and the surface of the first auxiliary plate 202 is 45°, the second included angle θ2 between the surface of the main plate 201 and the surface of the second auxiliary plate 203 is 35°, and the obtuse angle θ3 between the surface of the guide plate 204 and the surface of the second auxiliary plate 203 is 130°.

[0066] Example 2:

[0067] The diameter D1 of the rotating drum 1 is 500mm, the length L1 of the main plate 201 is 60mm, the length L2 of the first auxiliary plate 202 is 30mm, the length L3 of the second auxiliary plate 203 is 90mm, and the length L4 of the guide plate 204 is 35mm. Therefore, L1 / D1 is 0.12, L2 / L1 is 0.5, L3 / L1 is 1.5, and L4 / L1 is 0.58. Eighteen lifting plate assemblies 2 are evenly arranged along the circumference of the rotating drum 1. The first included angle θ1 between the surface of the main plate 201 and the surface of the first auxiliary plate 202 is 30°, the second included angle θ2 between the surface of the main plate 201 and the surface of the second auxiliary plate 203 is 45°, and the obtuse angle θ3 between the surface of the guide plate 204 and the surface of the second auxiliary plate 203 is 140°.

[0068] Example 3:

[0069] The diameter D1 of the rotating drum 1 is 200mm, the length L1 of the main plate 201 is 25mm, the length L2 of the first auxiliary plate 202 is 15mm, the length L3 of the second auxiliary plate 203 is 40mm, and the length L4 of the guide plate 204 is 15mm. Therefore, L1 / D1 is 0.125, L2 / L1 is 0.6, L3 / L1 is 1.6, and L4 / L1 is 0.6. Twelve lifting plate assemblies 2 are evenly arranged along the circumference of the rotating drum 1. The first included angle θ1 between the surface of the main plate 201 and the surface of the first auxiliary plate 202 is 35°, the second included angle θ2 between the surface of the main plate 201 and the surface of the second auxiliary plate 203 is 40°, and the obtuse angle θ3 between the surface of the guide plate 204 and the surface of the second auxiliary plate 203 is 135°.

[0070] Comparative Example 1:

[0071] The rotary kiln using traditional straight-plate lifting plates has a diameter D1 of 300mm for the rotary drum 1 and a length of 30mm for the lifting plates. Fifteen lifting plates are evenly arranged along the circumference of the rotary drum 1.

[0072] Using the uniformity of the material curtain, heat transfer efficiency, and activation uniformity of Comparative Example 1 as a benchmark, measurements were taken for Examples 1, 2, and 3, respectively. The measurement results are shown in Table 1.

[0073] Table 1: Measurement Results

[0074] Comparative Example 1 1 1 1 Example 1 1.2 1.15 1.2 Example 2 1.3 1.1 1.3 Example 3 1.25 1.2 1.25

[0075] As shown in Table 1, Example 1, compared to Comparative Example 1, shows a 20% improvement in material uniformity, a 15% improvement in heat transfer efficiency, and a 20% improvement in activation uniformity. Example 2, compared to Comparative Example 1, shows a 30% improvement in material uniformity, a 10% improvement in heat transfer efficiency, and a 30% improvement in activation uniformity. Example 3, compared to Comparative Example 1, shows a 25% improvement in material uniformity, a 20% improvement in heat transfer efficiency, and a 25% improvement in activation uniformity. Therefore, the embodiments of this utility model can significantly improve the uniformity of material distribution, prolong the gas-solid contact time, improve the gas-solid contact efficiency, and facilitate the improvement of activation uniformity.

[0076] It should be noted that in Table 1, using the material curtain uniformity, heat transfer efficiency, and activation uniformity of Comparative Example 1 as the benchmark means that the material curtain uniformity, heat transfer efficiency, and activation uniformity of Comparative Example 1 are converted into a standard value "1", and the actual measured values ​​of Examples 1, 2, and 3 are converted proportionally. For example, if the actual measured material curtain uniformity in Comparative Example 1 is 0.1, then the actual measured material curtain uniformity in Example 1 in Table 1 is 0.12.

[0077] In this embodiment, the uniformity of the material curtain is measured as follows: In a cold-molded rotary kiln made of acrylic material, the lifting plate assembly 2 of Comparative Example 1 or Examples 1, 2, and 3 is installed. A certain mass of alumina microspheres is loaded, requiring the alumina microspheres to fill 10% of the volume of the rotating drum 1. The rotating drum 1 is controlled to rotate at a certain speed. The rotating drum 1 is provided with an observation port. An industrial endoscope is inserted into the rotating drum 1 through the observation port to capture real-time images of the formation and falling process of the material curtain and calculate the area traversed by the alumina microspheres inside the rotating drum 1. This area divided by the cross-sectional area of ​​the rotating drum 1 gives the uniformity of the material curtain.

[0078] A uniform material curtain ensures that carbon particles have nearly identical temperature histories, atmosphere concentration histories, and residence times, resulting in activated carbon with a highly consistent pore structure. Material curtain uniformity is one of the most critical factors determining activation uniformity. Activation uniformity and material curtain uniformity exhibit a highly non-linear relationship. In this application's embodiments, activation uniformity is indirectly measured through material curtain uniformity.

[0079] The heat transfer efficiency is measured as follows: A certain mass of carbonized material is loaded into a rotary kiln. The lifting plate assembly 2 of Comparative Example 1 or Examples 1, 2, and 3 is installed. A thermocouple is inserted into the material curtain at the outlet of the rotary drum 1. The heating rate of the wall heater of the rotary drum 1 is set to 5℃ / min. The temperature of the material curtain is continuously measured at different times using the thermocouple, and the actual heating rate of the material is calculated. The calculation method is: (temperature difference between two adjacent measurements) / (time interval between two adjacent measurements). After multiple measurements, the average value is taken to obtain the heat transfer efficiency.

[0080] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this application.

Claims

1. A rotary kiln, characterized in that, include: Rotating drum (1), with an internal cavity; Multiple lifting plate assemblies (2) are spaced apart on the inner wall of the rotating drum (1). Each lifting plate assembly (2) includes a main plate (201), a first sub-plate (202), a second sub-plate (203), and a guide plate (204). The main plate (201) is disposed on the inner wall of the rotating drum (1) and extends radially along the rotating drum (1). One end of the first sub-plate (202) along the length direction is connected to one side of the main plate (201). The second sub-plate (203) along the length direction has a first end and a second end opposite to each other. The first end is connected to the opposite side of the main plate (201), and the second end is connected to one end of the guide plate (204) along the length direction, so that the plate surface of the guide plate (204) and the plate surface of the second sub-plate (203) form an obtuse angle, which faces the main plate (201). Along the rotation direction of the rotating drum (1), the first sub-plate (202) is located upstream of the second sub-plate (203).

2. The rotary kiln according to claim 1, characterized in that, The length of the main board (201) is L1, and the diameter of the rotating drum (1) is D1, satisfying 0.1≤L1 / D1≤0.125, 10mm≤L1≤125mm, and 100mm≤D1≤1000mm.

3. The rotary kiln according to claim 2, characterized in that, The arc length of the rotating drum (1) between adjacent main boards (201) is L5, which satisfies 1≤L5 / L1≤3.

4. The rotary kiln according to claim 2, characterized in that, The length of the first sub-plate (202) is L2, which satisfies 0.3≤L2 / L1≤0.

8.

5. The rotary kiln according to claim 2, characterized in that, The length of the second sub-plate (203) is L3, which satisfies 1.15≤L3 / L1≤2.

6. The rotary kiln according to claim 2, characterized in that, The length of the guide plate (204) is L4, which satisfies 0.5≤L4 / L1≤1.

7. The rotary kiln according to any one of claims 1 to 6, characterized in that, The surface of the main board (201) and the surface of the first sub-board (202) form a first included angle θ1, which satisfies 30°≤θ1≤60°; And / or, the surface of the main board (201) and the surface of the second sub-board (203) form a second included angle θ2, satisfying 30°≤θ2≤60°.

8. The rotary kiln according to any one of claims 1 to 6, characterized in that, The obtuse angle formed between the surface of the guide plate (204) and the surface of the second sub-plate (203) is θ3, which satisfies 100°≤θ3≤150°.

9. The rotary kiln according to any one of claims 1 to 6, characterized in that, The main board (201) has a dividing line located in the middle along the radial direction of the rotating cylinder (1); The connection between the first sub-plate (202) and the main plate (201) is located between the dividing line and the connection between the main plate (201) and the rotating cylinder (1); And / or, the connection between the second sub-plate (203) and the main plate (201) is located between the dividing line and the connection between the main plate (201) and the rotating cylinder (1).

10. The rotary kiln according to claim 9, characterized in that, The connection point between the first sub-board (202) and the main board (201) is located at the bottom of the main board (201); And / or, the connection between the second sub-board (203) and the main board (201) is located at the bottom of the main board (201).

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