Coal bunker capable of reducing coal powder fluctuation

Abstract

The utility model discloses a coal dust bin that can reduce coal dust scale fluctuation, including bin body, with the bin cone of bin body connection, the bottom of bin body is provided with the discharge gate, and the surface of bin cone is set to the flow guide surface back to the discharge gate, and the center line of flow guide surface is identical with the center line of bin body, and the distance between the point on flow guide surface and bin body inner wall increases with the increase of its distance from the discharge gate. The coal dust bin that can reduce coal dust scale fluctuation reduces the speed of coal dust falling through the setting bin cone, and can reduce the impact of coal dust on the metering scale.

Description

Technical Field

[0001] This utility model relates to the field of pulverized coal silos, specifically to a pulverized coal silo that can reduce fluctuations in pulverized coal scales. Background Technology

[0002] In the cement production process, pulverized coal is an important fuel, and its stable supply and accurate metering have a crucial impact on the normal operation of cement kilns and energy consumption levels.

[0003] The existing pulverized coal preparation system in cement clinker production lines has certain limitations in its structural design of the pulverized coal silo. At the conical section of the silo, the discharge of pulverized coal impacts the weighing scale, affecting its accuracy. This is especially true when the material level in the silo is low; the pulverized coal entering the silo falls directly onto the weighing scale below, causing significant impact and potentially leading to fluctuations in the scale's readings. These fluctuations not only affect the stability of the pulverized coal supply but can also result in incomplete combustion in the cement kiln, increasing energy consumption, reducing production efficiency, and ultimately impacting the quality of the cement product. Utility Model Content

[0004] The purpose of this invention is to provide a coal powder bin that can reduce fluctuations in the coal powder scale. This coal powder bin reduces the falling speed of coal powder by setting a bin cone, thereby reducing the impact of coal powder on the weighing scale.

[0005] To achieve the above objectives, this utility model provides a coal powder bin that can reduce fluctuations in the coal powder scale, including a bin body and a bin cone connected to the bin body. The bottom of the bin body is provided with a discharge port, and the surface of the bin cone facing away from the discharge port is set as a guide surface. The center line of the guide surface is consistent with the center line of the bin body, and the distance between the top point of the guide surface and the inner wall of the bin body increases with the increase of its distance from the discharge port.

[0006] Preferably, the guide surface is a cone-shaped surface with the opening facing downwards.

[0007] Preferably, the angle between the conical surface and the horizontal plane is set to α, where α ≥ 55°.

[0008] Preferably, the vertical gap between the bottom edge of the silo cone and the inner wall of the silo is set to L, where L ≥ 150 mm.

[0009] Preferably, the diameter of the bottom of the conical surface is not less than the diameter of the feed opening.

[0010] Preferably, the silo cone is connected to the inner wall of the silo via a connecting structure.

[0011] Preferably, the discharge port is equipped with a flow rate regulating mechanism.

[0012] According to the above technical solution, in this invention, the pulverized coal located inside the silo slides down along the guide surface of the silo cone, falls into the side wall of the silo, and then slides down the side wall of the silo onto the weighing scale below for measurement. During the descent of the pulverized coal, it first rubs against the guide surface of the silo cone and then collides with the side wall of the silo. Therefore, after the pulverized coal reaches the side wall of the silo, some of its kinetic energy is lost during the friction and collision. Subsequently, the pulverized coal slides down the side wall of the silo. Although the gravitational potential energy of the pulverized coal is converted into kinetic energy during the sliding process, some of the kinetic energy is still consumed due to the friction between the pulverized coal and the side wall of the silo. Therefore, the speed of the pulverized coal when it reaches the weighing scale is lower than that without the action of the silo cone. Thus, by setting the silo cone, the impact of the pulverized coal on the weighing scale when it falls can be improved, thereby reducing the fluctuation of the weighing scale and effectively improving the measurement accuracy of the weighing scale.

[0013] When the material level in the silo is low, the pulverized coal falling from the feed inlet above the pulverized coal silo will first collide with the cone of the silo. This collision effectively reduces the kinetic energy of the pulverized coal, preventing it from falling directly into the weighing scale and causing inaccurate readings. Subsequently, the pulverized coal that has collided with the cone will flow along the guide surface to the inner wall of the silo. During this process, the friction between the pulverized coal and the guide surface will slow it down. Then, the pulverized coal will collide with the side wall of the silo, losing some kinetic energy again. Therefore, installing a cone in the silo not only prevents the pulverized coal from falling freely into the weighing scale when the material level is low, but also slows down the pulverized coal during its descent, thereby further reducing the impact force on the weighing scale.

[0014] The distance between the top of the guide surface and the inner wall of the silo increases with the distance from the discharge port. That is, the closer to the discharge port, the smaller the space between the guide surface and the inner wall of the silo. Therefore, the flowability of pulverized coal is worse closer to the discharge port. This is because the size of the cross-section directly affects the flow velocity and flow pattern of pulverized coal when it passes through it. A larger cross-section generally results in a faster flow velocity because it provides more space, reducing friction and collisions between pulverized coal particles, thus lowering flow resistance. Conversely, a smaller cross-section slows down the flow velocity because it increases friction and collisions, thus increasing flow resistance. Therefore, by setting the distance between the top of the guide surface and the inner wall of the silo to increase with the distance from the discharge port, the velocity of the pulverized coal passing through the bottom of the guide surface is reduced, effectively slowing down the pulverized coal and reducing its impact on the metering scale.

[0015] In summary, by installing a cone inside the coal powder silo, the velocity of the coal powder at the moment of contact with the weighing scale can be significantly reduced, thereby reducing the impact of the coal powder on the weighing scale and avoiding the problem of measurement fluctuations.

[0016] Since the pulverized coal needs to slide downwards along the guide surface, the guide surface needs to be designed as a wear-resistant surface. Preferably, the silo cone includes a guide surface and a silo cone body, and the outer surface of the silo is configured as a guide surface that is detachably connected to the silo cone body.

[0017] The guide surface is made of wear-resistant material, preferably 1Cr18Ni9Ti, which not only has wear-resistant properties but also has a smooth surface that effectively prevents coal dust from forming a crust on its surface. This guide surface can be fixed to the lower conical body by welding, and the conical body can be repaired by replacing the guide surface after wear.

[0018] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the following detailed description to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0020] Figure 1 This is a schematic diagram of a pulverized coal silo that can reduce fluctuations in the pulverized coal scale.

[0021] Figure 2 yes Figure 1 A partial view;

[0022] Figure 3 yes Figure 1 Top view.

[0023] Explanation of reference numerals in the attached figures

[0024] 1. Compartment body 2. Compartment cone

[0025] 3. Feed port 21. Guide surface

[0026] 22-cell cone body 4-connection structure

[0027] 5. Flow rate regulation mechanism Detailed Implementation

[0028] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0029] In this utility model, unless otherwise stated, directional words such as "bottom," "back," "outer surface," "axis," "conical," and "near" in the terminology only represent the orientation of the term in its conventional use or are common terms understood by those skilled in the art, and should not be regarded as limitations on the term.

[0030] See Figure 1-3 The coal powder silo that can reduce the fluctuation of the coal powder scale includes a silo body 1 and a silo cone 2 connected to the silo body 1. The bottom of the silo body 1 is provided with a discharge port 3. The surface of the silo cone 2 facing away from the discharge port 3 is provided as a guide surface 21. The center line of the guide surface 21 is consistent with the center line of the silo body 1. The distance between a point on the guide surface 21 and the inner wall of the silo body 1 increases as the distance between the guide surface 21 and the discharge port 3 increases.

[0031] Through the implementation of the above technical solution, under normal circumstances, the coal powder located in the bin 1 will slide down along the guide surface 21 of the bin cone 2 and fall into the side wall of the bin 1, and then slide down the side wall of the bin 1 onto the weighing scale below for measurement. During the process of the coal powder falling, the coal powder will first rub against the guide surface 21 of the bin cone 2, and then collide with the side wall of the bin 1. Therefore, after the coal powder reaches the side wall of the bin 1, some of its kinetic energy has been lost in the process of friction and collision. Then the coal powder will slide down along the side wall of the bin 1. Although the gravitational potential energy of the coal powder will be converted into kinetic energy during the sliding process, some of the kinetic energy of the coal powder will still be consumed due to the friction between the coal powder and the side wall of the bin 1. Therefore, the speed of the coal powder when it reaches the weighing scale will be lower than the speed when there is no bin cone 2. Therefore, by setting the bin cone 2, the impact of the coal powder on the weighing scale when it falls can be improved, thereby reducing the fluctuation of the weighing scale and effectively improving the measurement accuracy of the weighing scale.

[0032] When the material level in silo 1 is low, the coal powder falling from the feed inlet above the coal powder silo will first collide with the cone 2. This collision effectively reduces the kinetic energy of the coal powder, preventing it from falling directly onto the weighing scale and causing inaccurate measurement. Subsequently, the coal powder that collides with the cone 2 will flow along the guide surface 21 towards the inner wall of silo 1. During this process, the friction between the coal powder and the guide surface 21 will slow down the coal powder. Then, the coal powder will collide with the side wall of silo 1, losing some kinetic energy again. Therefore, setting the cone 2 inside silo 1 not only prevents the coal powder from falling freely into the weighing scale when the material level in silo 1 is low, but also slows down the coal powder during its fall, thereby further reducing the impact force of the coal powder falling onto the weighing scale.

[0033] The distance between the top point of the guide surface 21 and the inner wall of the bin 1 increases with the distance from the discharge port 3. That is, the closer to the discharge port 3, the smaller the space between the guide surface 21 and the inner wall of the bin 1. Therefore, the flowability of pulverized coal is worse closer to the discharge port 3. This is because the size of the cross-section directly affects the flow velocity and flow pattern of pulverized coal when it passes through it. When the cross-section is larger, the flow velocity of pulverized coal is generally faster because a larger cross-section provides more space, reducing mutual friction and collision between pulverized coal particles, thus reducing flow resistance. Conversely, when the cross-section is smaller, the flow velocity of pulverized coal slows down because a smaller cross-section increases mutual friction and collision between pulverized coal particles, thus increasing flow resistance. Therefore, by setting the distance between the top point of the guide surface 21 and the inner wall of the bin 1 to increase with the distance from the discharge port 3, the velocity of pulverized coal passing through the bottom of the guide surface 21 is reduced, thereby achieving a deceleration effect on the pulverized coal and effectively reducing the impact of pulverized coal on the weighing scale.

[0034] In summary, by setting a cone 2 inside the pulverized coal silo 1, the velocity of the pulverized coal at the moment of contact with the weighing scale can be significantly reduced, thereby reducing the impact of the pulverized coal on the weighing scale and avoiding the problem of measurement fluctuation.

[0035] The pulverized coal needs to slide downwards along the guide surface 21, therefore, the guide surface 21 needs to be set as a wear-resistant surface. Preferably, the silo cone 2 includes a guide surface 21 and a silo cone body 22, and the outer surface of the silo is set as the guide surface 21 which is detachably connected to the silo cone body 22.

[0036] The guide surface 21 is made of wear-resistant material. Preferably, it is made of 1Cr18Ni9Ti material, which not only has wear-resistant properties but also has a smooth surface that can effectively prevent coal dust from forming on its surface. The guide surface 21 can be fixed to the lower cone body 22 by welding. After the cone 2 wears out, it can be repaired by replacing the guide surface 21.

[0037] In this embodiment, preferably, the guide surface 21 is a cone-shaped surface with the opening facing downwards.

[0038] Setting the guide surface 21 as a conical surface allows the coal powder to be evenly distributed along the circumference of the conical surface after falling into the guide surface 21, avoiding the coal powder from forming strands or accumulating on the guide surface 21. On the one hand, it is conducive to the uniform feeding of the coal powder silo to the metering scale below, avoiding the metering fluctuation of the metering scale. On the other hand, it can also prevent the guide surface 21 from wearing out quickly in certain areas, thereby extending the service life of the silo cone 2.

[0039] The closer to the discharge port 3, the larger the cross-sectional radius of the conical surface, and the smaller the space between the conical surface and the inner wall of the silo 1. Therefore, the pulverized coal has poorer flowability closer to the discharge port 3. Thus, setting the guide surface 21 as a downward-opening conical surface can also reduce the flow velocity of the pulverized coal by reducing the cross-sectional size that the pulverized coal needs to pass through.

[0040] In this embodiment, preferably, the angle between the conical surface and the horizontal plane is set to α, where α ≥ 55°.

[0041] If pulverized coal accumulates on the guide surface 21 of the cone 2, it may spontaneously combust over time, leading to a safety accident. By setting α≥55°, the accumulation of pulverized coal on the guide surface 21 can be effectively prevented.

[0042] In static equilibrium, the angle between the free surface of the accumulated powder and the horizontal plane is called the angle of repose. The size of the angle of repose directly reflects the flowability of the powder; the smaller the angle of repose, the better the flowability of the powder. The angle of repose of pulverized coal is usually between 30° and 50°, with the specific value varying depending on factors such as the particle size, moisture content, and type of coal. Therefore, when the conical guide surface 21 of the silo cone 2 is set to have an angle of not less than 55° with the horizontal plane, the pulverized coal will not be able to accumulate on the guide surface 21, thus effectively preventing the accumulation of pulverized coal on the silo cone 2.

[0043] In this embodiment, preferably, the vertical gap between the bottom edge of the silo cone 2 and the inner wall of the silo body 1 is set to L, where L ≥ 150 mm.

[0044] The size of the flow cross section affects the flowability of pulverized coal. When the cross section is smaller, the flow speed of pulverized coal will be slower because the smaller cross section increases the mutual friction and collision between pulverized coal particles, thereby increasing the flow resistance. A smaller cross section may also cause pulverized coal particles to become blocked or produce uneven flow when passing through.

[0045] Therefore, setting the bottom edge of the silo cone 2 to have a vertical gap of not less than 150mm from the inner wall of the silo body 1 can prevent coal powder from getting stuck at this position and ensure that the coal powder silo can be reliably discharged.

[0046] In this embodiment, preferably, the diameter of the bottom of the conical surface is not less than the diameter of the discharge port 3.

[0047] The cone 2 is coaxially arranged with the body 1, so that the cone 2 is also coaxially arranged with the discharge port 3. The cone 2, located above the discharge port 3, can block the discharge port 3 and prevent coal powder from falling directly from the discharge port 3 and causing a large impact on the metering scale below.

[0048] The diameter of the bottom of the conical surface is set to be no less than the diameter of the discharge port 3, so that the cone 2 can completely block the discharge port 3, thereby effectively preventing the coal powder above from falling directly from the discharge port 3 to the weighing scale.

[0049] Especially when the material level in the pulverized coal silo is low, the upper feed inlet will feed the pulverized coal silo. By setting the silo cone 2, the pulverized coal can be effectively prevented from falling freely from the feed inlet to the lower metering scale, thereby avoiding a large impact on the metering scale and reducing the metering fluctuation.

[0050] In this embodiment, preferably, the hopper cone 2 is connected to the inner wall of the hopper body 1 via the connecting structure 4.

[0051] The cone 2 is fixedly connected to the inner wall of the silo body 1 by the connecting structure 4. The connecting structure 4 is set as an angle steel, with both ends of the angle steel connected to the inner surface of the cone 2 and the inner wall of the silo body 1, respectively. The connection can be achieved by welding. Preferably, the weld between the angle steel and the inner wall of the silo body 1 needs to be ground smooth to avoid coal dust accumulation at the connection point.

[0052] Preferably, the angle steel opening is set towards the feed port 3. When the coal powder falls and encounters the angle steel, it will be guided to the side along the edge of the angle steel, thus avoiding the accumulation of coal powder at the location of the connecting structure 4.

[0053] Preferably, multiple connecting structures 4 are provided, and the multiple connecting structures 4 are evenly distributed along the circumference of the hopper body 1 to support the hopper cone 2.

[0054] In this embodiment, preferably, the discharge port 3 is provided with a flow rate regulating mechanism 5.

[0055] The flow rate regulating mechanism 5 controls the speed of coal powder falling, and in conjunction with the metering scale, it enables controllable feeding of subsequent processes.

[0056] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0057] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.

[0058] Furthermore, various different embodiments of this utility model can be combined in any way, as long as they do not violate the spirit of this utility model, they should also be regarded as the content disclosed by this utility model.

Claims

1. A coal bunker capable of reducing coal powder scale fluctuation, characterized by, It includes a silo body (1) and a cone (2) connected to the silo body (1). The bottom of the silo body (1) is provided with a discharge port (3). The surface of the cone (2) facing away from the discharge port (3) is set as a guide surface (21). The center line of the guide surface (21) is consistent with the center line of the silo body (1). The distance between the point on the guide surface (21) and the inner wall of the silo body (1) increases as the distance between it and the discharge port (3) increases.

2. The coal bunker capable of reducing coal powder scale fluctuation according to claim 1, characterized in that, The guide surface (21) is set as a cone with the opening facing downward.

3. The coal bunker capable of reducing coal powder fluctuation according to claim 2, characterized in that, The angle between the conical surface and the horizontal plane is set to α, where α ≥ 55°.

4. The coal bunker capable of reducing coal powder fluctuation according to claim 2, characterized in that, The vertical gap between the bottom edge of the silo cone (2) and the inner wall of the silo body (1) is set to L, where L≥150mm.

5. The coal bunker capable of reducing coal powder fluctuation according to claim 2, characterized in that, The diameter of the bottom of the conical surface is not less than the diameter of the feed opening (3).

6. The coal bunker capable of reducing coal powder scale fluctuation according to claim 1, characterized in that, The silo cone (2) is connected to the inner wall of the silo body (1) through the connecting structure (4).

7. The pulverized coal silo capable of reducing fluctuations in the pulverized coal scale according to claim 1, characterized in that, The discharge port (3) is equipped with a flow rate adjustment mechanism (5).

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