Efficient powder selection structure of coal mill

Abstract

The utility model relates to the technical field of coal powder selecting device discloses a coal mill high -efficient powder structure, including structure body and the connecting pipe fixedly connected on the upper and lower ends of structure body, the inside rotation connection of structure body has rotor body, the outside fixed connection of rotor body has low resistance rotor blade, the utility model discloses the setting of low resistance rotor blade and L type air deflector blade has realized can make the effect that the wind speed of primary selection powder chamber upper and lower area is consistent, has reduced low resistance rotor blade and L type air deflector blade's abrasion simultaneously, has solved the unreasonable taper of the primary selection classification chamber of current coal mill powder structure, has led to the wind speed of primary selection powder chamber upper and lower area not being consistent in operation, the suction of the place where wind speed is high under the rotor of powder concentrator same speed is big, and the coarse particle enters the finished product and influences product quality, and the partial fine material also can not be transported to finished product material in the place where wind speed is low, forms material in the mill circulation, leads to the problem of mill quality and yield decline.

Description

Technical Field

[0001] This utility model relates to the technical field of coal powder classifiers, specifically a high-efficiency coal mill classification structure. Background Technology

[0002] The vertical coal mill is a fully air-swept mill that integrates material grinding, drying, classification, and conveying, and is now widely used in industries such as cement and power. Its main principle utilizes the bed-grinding principle to grind materials. After being crushed by compression, the material entering the mill is thrown off the grinding disc and settles at the nozzle ring under centrifugal force. High-speed air at this point blows and disperses the material, carrying it to the upper part of the mill. After being screened by the classifier, the finished product enters the dust collector for collection, while coarse powder and particles are recycled back to the grinding disc for further grinding. However, existing coal mill classification structures still encounter some problems in actual use.

[0003] For example, patent application number CN201520194196.2 discloses a series biaxial high-efficiency powder classifier. An inner cylinder is set between the shell and the inner cone, which divides the channel connecting the primary air duct into a sorting channel and a return powder channel. The sorting channel is equipped with upper and lower baffles around its circumference. The fineness of the coal powder is adjusted by adjusting the opening of the upper and lower baffles. The return powder channel inlet is set between the upper end of the inner cylinder and the cover plate. A return powder quantity control device is fixedly set around its circumference. It has the characteristics of high sorting efficiency. The existing coal mill powder classifier structure has an unreasonable cone of the primary sorting chamber, which leads to inconsistent air velocity in the upper and lower areas of the primary sorting chamber during operation. At the same rotation speed of the classifier rotor, the suction force is large in the area with high air velocity, and coarse particles enter the finished product, affecting the product quality. In the area with low air velocity, some fine materials cannot be transported to the finished product, resulting in material circulation in the mill, which leads to a decrease in mill quality and output.

[0004] To address the aforementioned problems, a high-efficiency coal mill classifier structure is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a high-efficiency coal mill classifier structure. By using this device, the problem of unreasonable taper of the primary classification chamber in existing coal mill classifier structures is solved. This leads to inconsistent air velocities in the upper and lower areas of the primary classification chamber during operation. In areas with high air velocity at the same rotor speed, the suction force is large, causing coarse particles to enter the finished product and affecting product quality. In areas with low air velocity, some fine materials cannot be transported to the finished product, resulting in material circulation within the mill and a decrease in mill quality and output.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a high-efficiency coal mill classifier structure, comprising a structural body and connecting pipes fixedly connected to the upper and lower ends of the structural body, a rotor body rotatably connected inside the structural body, low-resistance rotor blades fixedly connected to the outer side of the rotor body, and L-shaped air guide blades fixedly connected to the inner wall of the structural body, wherein multiple sets of low-resistance rotor blades and L-shaped air guide blades are provided.

[0007] Preferably, the tilt angle of the low-resistance rotor blades and the L-shaped guide vanes is 63 degrees.

[0008] By adopting the above-described structure and setting the tilt angle between the low-resistance rotor blades and the L-shaped guide vanes to 63 degrees, the problem of back-mixing of coarse and fine powders caused by radial airflow during rotor operation can be effectively eliminated, avoiding deviations in particle size and improving classification accuracy. Simultaneously, this unidirectional installation design at this angle reduces material erosion and wear on the blades, extending the equipment's service life.

[0009] Preferably, the distance between the L-shaped guide vane and the rotor body is 90 to 100 millimeters.

[0010] By employing the above-described structure, the distance between the L-shaped guide vanes and the rotor body is controlled between 90 and 100 millimeters. This ensures a uniform airflow velocity gradient in the separation zone, enhances material dispersion, and extends material separation time. This spacing design avoids problems such as uneven classifying force fields and material agglomeration caused by excessive spacing, significantly improving classification accuracy.

[0011] Preferably, the inner wall of the structure body is inclined at a 75-degree angle.

[0012] The design employs a 75-degree inclination angle on the inner wall of the structure, ensuring uniform airflow velocity across the upper and lower regions as the gas containing material moves upwards from the bottom of the mill into the primary separation chamber, thus stabilizing the airflow field during powder classification. This design fundamentally solves the problem of inconsistent airflow caused by the unreasonable taper of traditional structures, laying the foundation for improving material dispersion and classification accuracy in the separation zone of the powder classifier.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] 1. This application achieves consistent air velocity in the upper and lower areas of the primary powder classifier chamber by setting low-resistance rotor blades and L-shaped guide vanes. At the same time, it reduces the wear of low-resistance rotor blades and L-shaped guide vanes. It solves the problem that the existing coal mill powder classifier structure has an unreasonable taper of the primary classification chamber, which leads to inconsistent air velocity in the upper and lower areas of the primary powder classifier chamber during operation. In areas with high air velocity at the same rotor speed, the suction force is large, and coarse particles enter the finished product, affecting product quality. In areas with low air velocity, some fine materials cannot be transported to the finished product, resulting in material circulation in the mill and a decrease in mill quality and output.

[0015] 2. This application, through the setting of L-shaped guide vanes and rotor body, ensures the airflow velocity gradient in the separation zone, improves material dispersion, and extends the separation time. It solves the problems of unreasonable spacing between L-shaped guide vanes and rotor body in existing coal mill classification structures, the existence of a dispersion separation area between L-shaped guide vanes and rotor body, excessive spacing in this area, large airflow velocity gradient, uneven classification force field, easy material agglomeration, and low classification accuracy. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a structural diagram of the low-resistance rotor blade and rotor body of this utility model;

[0018] Figure 3 For the present utility model Figure 2 Enlarged structural diagram at point A in the middle.

[0019] In the figure: 1. Main body; 11. Rotor body; 111. Low-resistance rotor blades; 12. L-shaped guide vanes; 2. Connecting pipe. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings.

[0022] Combination Figures 1-3A high-efficiency coal mill classifier structure includes a structural body 1 and a connecting pipe 2 fixedly connected to the upper and lower ends of the structural body 1. A rotor body 11 is rotatably connected inside the structural body 1. Low-resistance rotor blades 111 are fixedly connected to the outside of the rotor body 11. L-shaped air guide blades 12 are fixedly connected to the inner wall of the structural body 1. Multiple sets of low-resistance rotor blades 111 and L-shaped air guide blades 12 are provided.

[0023] The present invention will be further described below with reference to the embodiments. Example

[0024] To address the problem of inconsistent air velocities in the upper and lower areas of the primary classification chamber in existing coal mills due to an unreasonable cone angle, resulting in high draft force in areas with high air velocity at the same rotor speed, causing coarse particles to enter the finished product and affecting product quality, and conversely, preventing some fine materials from being conveyed to the finished product in areas with low air velocity, leading to material circulation within the mill and a decrease in mill quality and output, this embodiment discloses the following technical solution, specifically as follows: Figures 1-3 As shown, the inclination angle of the low-resistivity rotor blade 111 and the L-shaped guide vane 12 is 63 degrees, and the inner wall of the main body 1 is set at an inclination angle of 75 degrees. By setting the inclination angle of the inner wall of the primary separation chamber 1 at 75 degrees, the airflow velocity is uniform when the gas containing material moves upward from the bottom of the mill into the primary separation chamber, stabilizing the powder separation flow field. In order to improve the material dispersion and classification accuracy in the separation zone of the powder separator, the low-resistivity rotor blade 111 and the L-shaped guide vane 12 are designed. The inclination angle of the low-resistivity rotor blade 111 and the L-shaped guide vane 12 is 63 degrees, which eliminates the radial airflow that occurs in the low-resistivity rotor blade 111 during operation, causing back mixing of coarse and fine powders, resulting in deviation in the particle size and reducing the classification accuracy. The same direction installation reduces the scouring and wear of the material on the low-resistivity rotor blade 111 and the L-shaped guide vane 12, and achieves the effect of making the wind speed in the upper and lower areas of the primary powder separation chamber consistent, while reducing the wear of the low-resistivity rotor blade 111 and the L-shaped guide vane 12. Example

[0025] To address the problems in existing coal mill classifier structures, such as the unreasonable spacing between the L-shaped guide vanes 12 and the rotor body 11, resulting in a dispersed separation area between them, excessive spacing, large airflow velocity gradient, uneven classifying force field, easy material agglomeration, and low classification accuracy, this embodiment discloses the following technical solution, specifically as follows: Figure 3 As shown, the distance between the L-shaped guide vane 12 and the rotor body 11 is 90 to 100 millimeters. The distance between the L-shaped guide vane 12 and the rotor body 11 is controlled to be 90 to 100 millimeters to ensure the airflow velocity gradient in the separation zone, improve material dispersion, and extend the separation time.

[0026] It should be noted that the aforementioned electrical components are equipped with power supplies, and their control methods are existing technologies. To avoid redundancy, they will be described here uniformly. Furthermore, this application is primarily for the protection of mechanical equipment, so the control methods and circuit connections will not be explained in detail herein. In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency coal mill classifier structure, comprising a structural body (1) and connecting pipes (2) fixedly connected to the upper and lower ends of the structural body (1), characterized in that: The internal structure body (1) is rotatably connected to a rotor body (11), and the outer side of the rotor body (11) is fixedly connected to a low-resistance rotor blade (111). The inner wall of the structure body (1) is fixedly connected to an L-shaped wind guide blade (12). Multiple sets of the low-resistance rotor blade (111) and the L-shaped wind guide blade (12) are provided.

2. The high-efficiency coal mill classifier structure according to claim 1, characterized in that: The tilt angle of the low-resistance rotor blade (111) and the L-shaped guide vane (12) is 63 degrees.

3. The high-efficiency coal mill classifier structure according to claim 2, characterized in that: The distance between the L-shaped guide vane (12) and the rotor body (11) is 90 to 100 millimeters.

4. The high-efficiency coal mill classifier structure according to claim 3, characterized in that: The inner wall of the structure body (1) is inclined at a 75-degree angle.

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