Dust suppression device in rotary kiln

Abstract

The utility model relates to the technical field of rotary kilns, in particular to a dust suppression device in a rotary kiln, which is characterized in that a plurality of groups of raising devices are uniformly distributed on the inner wall of a barrel of the rotary kiln along the axial direction; the material raising device comprises a plurality of material raising plates which are evenly distributed in the radial direction of a cylinder of the rotary kiln. The lifting plates of the adjacent lifting devices are arranged in a staggered manner; one end of the lifting board is fixedly connected with the inner wall of a barrel of the rotary kiln and is a fixed end, and the other end of the lifting board is a free end; the fixed end of the lifting plate is axially parallel to the cylinder body of the rotary kiln; and an included angle beta between the lifting plate and the radial direction of the cylinder body at the position where the fixed end of the lifting plate is located is more than 30 degrees and less than 60 degrees. The utility model has the advantages of not only being capable of disturbing and stir-frying materials, but also being capable of reducing the generation amount of dust, inhibiting the generation of dust and the like.

Description

Technical Field

[0001] This utility model relates to the field of rotary kiln technology, specifically to a dust suppression device inside a rotary kiln. Background Technology

[0002] Rotary kilns are widely used in various industrial fields, especially in drying powders, such as the drying process of ternary precursor powders. In this process, the ventilation or natural suction within the rotary kiln effectively removes water vapor, thereby achieving the drying purpose.

[0003] To enhance material mixing, rotary kilns typically incorporate lifting plates. Traditional rotary kilns often use arc-shaped or stepped lifting plates, but due to their large inclination angles and smooth surfaces, material is easily scattered during lifting, resulting in significant dust emissions. Consequently, dust pollution inside the rotary kiln is particularly severe, with ventilation often carrying large amounts of dust outside the kiln. This not only increases environmental pollution but also significantly reduces material output. Currently, relying solely on external dust collection equipment, such as cyclone dust collectors and baghouse dust collectors, is insufficient to effectively control dust dispersion at its source. Utility Model Content

[0004] Therefore, this utility model provides a dust suppression device for the inside of a rotary kiln, which solves the serious technical problem of dust generation inside rotary kilns in the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A dust suppression device for the inside of a rotary kiln, comprising multiple sets of lifting devices evenly distributed along the axial direction of the inner wall of the kiln cylinder; each lifting device includes multiple lifting plates evenly distributed along the radial direction of the kiln cylinder; the lifting plates of adjacent lifting devices are staggered; one end of each lifting plate is fixedly connected to the inner wall of the kiln cylinder, which is the fixed end, and the other end is the free end; the fixed end of the lifting plate is parallel to the axial direction of the kiln cylinder; the radial angle between the lifting plate and its fixed end on the cylinder is 30° < β < 60°.

[0007] Furthermore, multiple circular dust baffles are evenly distributed along the axial direction of the rotary kiln's cylinder; the center of each dust baffle overlaps with the axis of the rotary kiln's cylinder; the dust baffles are parallel to the radial direction of the rotary kiln's cylinder; the inner diameter of the rotary kiln's cylinder is D, the diameter of each dust baffle is d, the thickness of the material to be sintered is h, and D–d≥2*h.

[0008] Preferably, the dust baffle is composed of a first plate and a second plate; the inner wall of the rotary kiln is provided with a mounting frame; the first plate and the second plate are fixedly mounted on the mounting frame.

[0009] Preferably, the angle α between the bottom ends of the first plate and the second plate and their center is less than 180°.

[0010] Preferably, the distance between adjacent dust baffles is 3m < L < 5m.

[0011] Furthermore, it also includes a control unit, a frequency converter, and an exhaust fan connected to the cylinder (4) of the rotary kiln; pressure transmitters are provided at the kiln head, kiln tail, and preset positions of the rotary kiln to collect the kiln pressure; the frequency converter is electrically connected to the exhaust fan; the control unit is electrically connected to the frequency converter and the pressure transmitter respectively, obtains the kiln pressure collected by the pressure transmitter, and sends the corresponding operating frequency information to the frequency converter.

[0012] This utility model has at least the following beneficial effects:

[0013] Multiple sets of lifting devices are evenly distributed along the axial direction on the inner wall of the rotary kiln. The lifting devices include multiple lifting plates evenly distributed along the radial direction of the rotary kiln. One end of the lifting plate is fixedly connected to the inner wall of the rotary kiln, which is the fixed end. The fixed end of the lifting plate is parallel to the axial direction of the rotary kiln. The radial angle between the lifting plate and its fixed end and the position of the lifting plate and the position of the fixed end is 30° < β < 60°. This inclined arrangement can effectively reduce the material lifting height and the speed of horizontal throwing, reduce the dust residence time in the air, and the contact area with the airflow. This structure can both disturb and stir the material and reduce the amount of dust generated.

[0014] Furthermore, to reduce dust, multiple circular dust baffles are evenly distributed along the axial direction of the rotary kiln cylinder. The dust baffles are located above the material to be sintered, so as not to affect the movement of the material to be sintered. The dust baffles change the direction of airflow. When the airflow carrying dust in the kiln collides with the plate surface, the dust is blocked and settles back into the material to be sintered, reducing the loss of powder, increasing the output of material, and ensuring ventilation without losing the dewatering effect.

[0015] Furthermore, to address the technical problem that traditional rotary kiln dust collectors typically rely on manual control, making it impossible to adjust fan speed and cleaning frequency in real time, resulting in significant fluctuations in dust removal efficiency, a control unit, a frequency converter, and an exhaust fan connected to the rotary kiln body are also installed. Pressure transmitters are also installed at the kiln head, kiln tail, and preset positions. When the furnace pressure exceeds the preset furnace pressure, the control unit sends an increase frequency signal to the frequency converter, causing the exhaust fan speed to increase, thereby reducing the furnace pressure to within the preset range. When the furnace pressure is lower than the preset furnace pressure, the control unit sends a decrease frequency signal to the frequency converter, causing the exhaust fan speed to decrease, thereby increasing the furnace pressure to within the preset range.

[0016] Therefore, the dust suppression device inside the rotary kiln of this utility model has the advantages of both disturbing and stirring the materials, reducing the amount of dust generated, and suppressing dust generation. Attached Figure Description

[0017] To more clearly illustrate the prior art and the present invention, the accompanying drawings used in the description of the prior art and the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other drawings from the provided drawings without any creative effort.

[0018] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which this utility model can be implemented. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0019] Figure 1 This is a front sectional view of a dust suppression device inside a rotary kiln according to the present invention;

[0020] Figure 2 This utility model provides an accessory for a dust suppression device inside a rotary kiln. Figure 1 A magnified view of part A;

[0021] Figure 3 This is a left-side sectional view of a dust suppression device for the inside of a rotary kiln according to the present invention;

[0022] Figure 4 This is a front view of the first or second plate of a dust suppression device inside a rotary kiln according to the present invention.

[0023] Figure 5 This is a schematic diagram of the kiln pressure control system of a rotary kiln internal dust suppression device according to the present invention.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Lifting device; 101. Lifting plate; 2. Dust baffle; 201. First plate; 202. Second plate; 3. Mounting frame; 4. Cylinder; 5. Material to be sintered. Detailed Implementation

[0026] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] In the description of this application: unless otherwise stated, "a plurality of" means two or more. The terms "first," "second," "third," etc., in this application are intended to distinguish the objects referred to and do not have any special meaning in terms of technical connotation (e.g., they should not be construed as an emphasis on importance or order). Expressions such as "comprising," "including," and "having" also mean "not limited to" (certain units, components, materials, steps, etc.).

[0028] The terms used in this application, such as "upper," "lower," "left," "right," and "middle," are generally used to facilitate intuitive understanding by referring to the accompanying drawings, and are not absolute limitations on the positional relationships in the actual product. Changes in these relative positional relationships, without departing from the technical concept disclosed in this application, should also be considered within the scope of this application.

[0029] This utility model discloses a dust suppression device for the interior of a rotary kiln, such as... Figures 1 to 4 As shown, multiple sets of lifting devices 1 are evenly distributed axially along the inner wall of the rotary kiln cylinder 4. Each lifting device 1 includes multiple lifting plates 101 evenly distributed radially along the rotary kiln cylinder 4. The lifting plates 101 are straight plates. The lifting plates 101 of adjacent lifting devices 1 are staggered. One end of each lifting plate 101 is fixedly connected to the inner wall of the rotary kiln cylinder 4, serving as the fixed end, while the other end is a free end. The fixed end of the lifting plate 101 is parallel to the axial direction of the rotary kiln cylinder 4. The radial angle between the lifting plate 101 and its fixed end on the cylinder 4 is β, where 30° < β < 60°. This inclined arrangement effectively reduces the material lifting height and horizontal throwing speed, decreases the dust's residence time in the air, and reduces the contact area with the airflow. This structure can both agitate and stir the material while reducing dust generation.

[0030] Furthermore, to reduce dust, multiple circular dust baffles 2 are evenly distributed along the axial direction of the rotary kiln cylinder 4. The center of the dust baffle 2 overlaps with the axis of the rotary kiln cylinder 4, and the dust baffle 2 is radially parallel to the rotary kiln cylinder 4. The inner diameter of the rotary kiln cylinder 4 is D, the diameter of the dust baffle 2 is d, and the thickness of the material to be sintered 5 is h, where D–d≥2*h, ensuring that the dust baffle 2 is positioned above the material to be sintered 5 without affecting its movement. By setting up the dust baffles 2, the direction of airflow is changed. When the airflow carrying dust collides with the plate surface inside the kiln, the dust is blocked and settles back into the material to be sintered, reducing powder loss, increasing material output, and ensuring ventilation without sacrificing the dehydration effect.

[0031] Preferably, for ease of installation and convenient kiln maintenance and cleaning, the dust baffle 2 is composed of a first plate 201 and a second plate 202. The inner wall of the rotary kiln cylinder 4 is provided with a mounting frame 3, which is arranged radially along the cylinder 4. The first plate 201 and the second plate 202 are fixedly installed on the mounting frame 3. The first plate 201 and the second plate 202 are arranged in a non-contact manner, with a gap between them.

[0032] Preferably, in order to ensure that the circular surface formed by the first plate 201 and the second plate 202 is seamless and completely blocks the airflow, both the first plate 201 and the second plate 202 adopt a super semi-circular design, that is, the angle α between the bottom ends of the first plate 201 and the center of the circle is less than 180°.

[0033] Preferably, the distance between two adjacent dust baffles is typically 3m < L < 5m, which facilitates airflow within the kiln while ensuring that dust is blocked and settles.

[0034] Furthermore, to address the technical problem that traditional rotary kiln dust collectors typically rely on manual control, making it impossible to adjust fan speed and cleaning frequency in real time, resulting in significant fluctuations in dust removal efficiency, a kiln pressure control system is also installed. This system includes a control unit, a frequency converter, and an exhaust fan connected to the rotary kiln's cylinder 4. Pressure transmitters are installed at the kiln head, kiln tail, and preset positions to collect kiln pressure data. These pressure transmitters have an accuracy of ±0.5%FS. The frequency converter is electrically connected to the exhaust fan, and the fan speed is controlled by adjusting the frequency converter. The control unit uses a common PLC or DCS, which is electrically connected to the frequency converter and pressure transmitter respectively. The control unit acquires the furnace pressure collected by the pressure transmitter. When the furnace pressure exceeds the preset furnace pressure, the control unit sends an increase frequency information to the frequency converter, which increases the speed of the exhaust fan to reduce the furnace pressure to the preset furnace pressure range. When the furnace pressure is lower than the preset furnace pressure, the control unit sends a decrease frequency information to the frequency converter, which decreases the speed of the exhaust fan to increase the furnace pressure to the preset furnace pressure range. The specific implementation method is the prior art well known to those skilled in the art and will not be described in detail here.

[0035] The present application has been described in a relatively specific and detailed manner above through general descriptions and specific embodiments. It should be understood that, based on the technical concept of the present application, several conventional adjustments or further innovations can be made to these specific embodiments; however, as long as they do not depart from the technical concept of the present application, the technical solutions obtained by these conventional adjustments or further innovations also fall within the protection scope of the claims of the present application.

Claims

1. A dust suppressing device for a rotary kiln, characterized by comprising: The inner wall of the rotary kiln cylinder (4) is evenly distributed with multiple sets of lifting devices (1) along the axial direction; each lifting device (1) includes multiple lifting plates (101) evenly distributed along the radial direction of the rotary kiln cylinder (4); the lifting plates (101) of adjacent lifting devices (1) are staggered; one end of each lifting plate (101) is fixedly connected to the inner wall of the rotary kiln cylinder (4), which is the fixed end, and the other end is the free end; the fixed end of the lifting plate (101) is parallel to the axial direction of the rotary kiln cylinder (4); the angle between the lifting plate (101) and the radial direction of the cylinder (4) where its fixed end is located is 30° < β < 60°.

2. A device for suppressing dust inside a rotary kiln according to claim 1, characterized in that, Multiple circular dust baffles (2) are evenly distributed along the axial direction of the rotary kiln cylinder (4); the center of the dust baffle (2) overlaps with the axis of the rotary kiln cylinder (4); the dust baffle (2) is radially parallel to the rotary kiln cylinder (4); the inner diameter of the rotary kiln cylinder (4) is D, the diameter of the dust baffle (2) is d, the thickness of the material to be sintered is h, and D–d≥2*h.

3. A device for suppressing dust inside a rotary kiln according to claim 2, characterized in that, The dust baffle (2) is composed of a first plate (201) and a second plate (202); the inner wall of the rotary kiln cylinder (4) is provided with a mounting frame (3); the first plate (201) and the second plate (202) are fixedly mounted on the mounting frame (3).

4. A device for suppressing dust inside a rotary kiln according to claim 3, characterized in that, The angle α between the bottom ends of the first plate (201) and the center of the second plate (202) is less than 180°.

5. A device for suppressing dust inside a rotary kiln according to claim 2, characterized in that, The distance between adjacent dust baffles (2) is 3m < L < 5m.

6. A device for suppressing dust inside a rotary kiln according to any one of claims 1 to 5, characterized in that, It also includes a control unit, a frequency converter, and an exhaust fan connected to the cylinder (4) of the rotary kiln; pressure transmitters are provided at the kiln head, kiln tail, and preset positions of the rotary kiln to collect the kiln pressure; the frequency converter is electrically connected to the exhaust fan; the control unit is electrically connected to the frequency converter and the pressure transmitter respectively, obtains the kiln pressure collected by the pressure transmitter, and sends the corresponding operating frequency information to the frequency converter.

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