Air ring flow guide structure of coal mill

Abstract

The utility model provides a coal mill air ring flow guide structure and relates to the technical field of coal mills, the coal mill air ring flow guide structure comprises a movable air ring and a static air ring, the static air ring is located on the outer side of the movable air ring, an airflow channel is formed between the static air ring and the movable air ring, the movable air ring is provided with air holes used for guiding airflow into the coal mill, and the static air ring is fixedly provided with a flow guide ring plate; due to the arrangement of the flow guide ring plate and the cover plates, when the movable air ring rotates, air flow can act on pulverized coal in a more concentrated mode, the pulverized coal is promoted to be taken away by the air flow more sufficiently, coal briquettes which are not ground sufficiently and carry large coal briquettes are prevented from entering a slag discharging system, and therefore the coal briquettes are prevented from entering the slag discharging system. The cover plate is arranged, so that the ventilation area of the air holes can be properly reduced, the airflow velocity is increased under the condition that the output power of the fan is not changed, the fluidization effect on pulverized coal is further enhanced, the pulverized coal can be better suspended and flow in the coal mill, the accumulation and caking of the pulverized coal are reduced, and the possibility of forming larger coal briquettes is reduced.

Description

Technical Field

[0001] This application relates to the technical field of coal mills, and more particularly, to an air ring flow guiding structure for a coal mill. Background Art

[0002] A coal mill is an important device for grinding raw coal into pulverized coal. In the cement production industry, pulverized coal is used as the fuel for clinker burning in cement production. Grinding the coal into fine powder by a bowl coal mill can make it burn more fully and quickly, improve the combustion efficiency, and provide sufficient heat to complete the clinker firing process. The air ring of the coal mill is a key component in the bowl coal mill. It is usually located around the grinding area of the bowl coal mill and includes a moving air ring and a static air ring. The moving air ring is installed at the edge of the grinding table and rotates with the grinding table. The moving air ring is usually provided with air holes for guiding air flow into the coal mill, while the static air ring is fixed on the inner wall of the coal mill and corresponds to the moving air ring. Its function is to form a stable air flow channel so that the air flow can evenly pass through the coal mill.

[0003] However, during the use of the existing coal mill air ring, the air flow is only guided through the air flow channel formed between the static air ring and the moving air ring, and its guiding effect is limited. The pulverized coal cannot be fully carried away by the air flow, resulting in insufficient grinding and easily carrying large coal blocks into the slag discharge system. Summary of the Invention

[0004] The purpose of the embodiments of this application is to provide an air ring flow guiding structure for a coal mill, which can enhance the guiding effect of the air ring of the coal mill, increase the air flow velocity without changing the output power of the fan to enhance the fluidization effect on the pulverized coal, promote the pulverized coal to be more fully carried away by the air flow, and reduce the amount of unground and large coal blocks carried into the slag discharge system.

[0005] The embodiments of this application provide an air ring flow guiding structure for a coal mill, which is characterized in that: it includes a moving air ring for installing at the edge of the grinding table and rotating with the grinding table, and a static air ring fixed on the inner wall of the coal mill and arranged corresponding to the moving air ring. The static air ring is located outside the moving air ring, and an air flow channel is formed between the static air ring and the moving air ring. The moving air ring is provided with air holes for guiding air flow into the coal mill. A flow guiding ring plate is fixedly arranged on the static air ring, a casting material is filled between the flow guiding ring plate and the inner wall of the coal mill, and a plurality of cover plates are uniformly and fixedly arranged on the flow guiding ring plate. The cover plates are located above the air holes.

[0006] Further, the width of the cover plate is smaller than the width of the air hole.

[0007] Further, a reinforcing rib plate is fixedly arranged between the cover plate and the flow guiding ring plate.

[0008] Further, the height of the flow guiding ring plate is 10 - 20 cm.

[0009] Further, the width of the cover plate is 3 - 7 cm.

[0010] Further, there are three cover plates, and the three cover plates are arranged at equal intervals.

[0011] Further, the cover plate is arc-shaped, and the outer arc side of the cover plate is attached to the inner wall of the flow guiding ring plate.

[0012] Advantages of the present utility model:

[0013] The present utility model is improved on the basis of the existing device. A flow guiding ring plate is fixedly arranged on the static air ring, a castable is filled between the flow guiding ring plate and the inner wall of the coal mill, and a plurality of cover plates are evenly and fixedly arranged on the flow guiding ring plate. The cover plates are located above the air holes. Through the arrangement of the flow guiding ring plate and the cover plates, when the moving air ring rotates, the air flow can act more concentratedly on the pulverized coal, promoting the pulverized coal to be carried away by the air flow more fully, reducing the unground and large coal blocks entering the slag discharge system. Among them, the setting of the cover plates can appropriately reduce the ventilation area of the air holes, increase the air flow velocity under the condition that the output power of the fan remains unchanged, thereby enhancing the fluidization effect on the pulverized coal, making the pulverized coal better suspended and flowing in the coal mill, reducing the accumulation and caking of the pulverized coal, and thus reducing the possibility of forming large coal blocks. Description of the drawings

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0015] Figure 1 It is a schematic structural diagram of some embodiments of the present application;

[0016] Figure 2 It is a top view of some embodiments of the present application;

[0017] The reference numerals are respectively:

[0018] 1. Moving air ring; 2. Inner wall of coal mill; 3. Static air ring; 4. Air flow channel; 5. Air hole; 6. Flow guiding ring plate; 7. Castable; 8. Cover plate; 9. Reinforcing rib plate. Detailed implementation manners

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Apparently, the described embodiments are some, but not all, of the embodiments of this application. The components of the embodiments of this application usually described and illustrated in the drawings here can be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of this application that is claimed, but merely represents selected embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the scope of protection of this application.

[0021] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0022] In the description of this application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is usually placed when in use. It is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to this application. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0023] In addition, terms such as "horizontal", "vertical", "overhanging", etc. do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0024] In the description of this application, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations. Specific embodiments:

[0026] For example Figure 1And Figure 2 As shown in the figure, the present application provides a wind ring diversion structure for a coal mill, which includes a moving wind ring 1 installed on the edge of the grinding table and rotating together with the grinding table, and a static wind ring 3 fixed on the inner wall 2 of the coal mill and arranged corresponding to the moving wind ring 1. The static wind ring 3 is located outside the moving wind ring 1, and an air flow channel 4 is formed between the static wind ring 3 and the moving wind ring 1. The moving wind ring 1 is provided with air holes 5 for guiding the air flow into the coal mill. A diversion ring plate 6 is fixedly arranged on the static wind ring 3, and a castable 7 is filled between the diversion ring plate 6 and the inner wall 2 of the coal mill. The castable 7 can support the outside of the diversion ring plate 6, and at the same time can prevent coal powder from entering and accumulating between the diversion ring plate 6 and the inner wall 2 of the coal mill, which affects the powder output effect. The top of the castable 7 is inclined, which can reduce the residue of coal ash on the top of the castable 7. A plurality of cover plates 8 are uniformly and fixedly arranged on the diversion ring plate 6, and the cover plates 8 are located above the air holes 5. The present application is improved on the basis of the existing device. Through the arrangement of the diversion ring plate 6 and the cover plates 8, when the moving wind ring 1 rotates, the air flow can act on the coal powder more concentratedly, promoting the coal powder to be taken away by the air flow more fully, reducing the unground and large coal blocks from entering the slag discharge system. Among them, the arrangement of the cover plates 8 can appropriately reduce the ventilation area of the air holes 5, increase the air flow velocity under the condition that the output power of the fan remains unchanged, and then enhance the fluidization effect on the coal powder, making the pulverized coal better suspended and flowing in the coal mill, reducing the accumulation and caking of coal powder, and thus reducing the possibility of forming large coal blocks.

[0027] As Figure 1 And Figure 2 shown, the width of the cover plate 8 is smaller than the width of the air hole 5 to ensure the air outlet of the air hole 5 and enable the air flow to enter the inside of the pulverizer.

[0028] As Figure 1 And Figure 2 shown, a reinforcing rib plate 9 is fixedly arranged between the cover plate 8 and the diversion ring plate 6. Through the arrangement of the reinforcing rib plate 9, the connection between the cover plate 8 and the diversion ring plate 6 is enhanced. In this embodiment, two symmetrically arranged reinforcing rib plates 9 are provided between each cover plate 8 and the diversion ring plate 6 to make the connection between the cover plate 8 and the diversion ring plate 6 stable.

[0029] As Figure 1 And Figure 2 shown, the height of the diversion ring plate 6 is 10 - 20 cm. In this embodiment, the height of the diversion ring plate 6 is 15 cm. While playing the role of guiding and blocking the wind, it avoids the movement interference between the diversion ring plate 6 and the grinding roller due to the excessive height of the diversion ring plate 6.

[0030] As Figure 1 And Figure 2 shown, the width of the cover plate 8 is 3 - 7 cm. In this embodiment, the width of the cover plate 8 is 5 cm, which partially blocks the air hole 5 and effectively ensures the air intake of the air hole 5.

[0031] AsFigure 1 and Figure 2 As shown in Figure 2 , there are three cover plates 8, and the three cover plates 8 are arranged at equal intervals. When the moving air ring 1 rotates, the air holes 5 on the moving air ring 1 orderly guide the air flow into the pulverizer. Since the cover plates 8 are located above the air holes 5, the ventilation area of the air holes 5 intermittently becomes smaller during the rotation of the moving air ring 1, so that the air flow velocity entering the pulverizer intermittently increases, effectively enhancing the fluidization effect on the pulverized coal.

[0032] As Figure 2 shown in Figure 2 , the cover plate 8 is arc-shaped, and the outer arc side of the cover plate 8 fits with the inner wall of the guide ring plate 6. Specifically, the cover plate 8 is welded to the guide ring plate 6 to prevent the air flow from passing through the gaps between the cover plates 8, thereby causing the air flow entering the coal mill to be chaotic and affecting the efficiency of the coal mill and the quality of the pulverized coal.

[0033] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A coal mill air ring guide structure, characterized in that: It includes a dynamic air ring installed on the edge of the grinding disc and rotating with the grinding disc, and a static air ring fixed on the inner wall of the coal mill and arranged corresponding to the dynamic air ring, the static air ring is located on the outer side of the dynamic air ring, an air flow channel is formed between the static air ring and the dynamic air ring, the dynamic air ring is provided with an air eye for guiding the air flow to the inside of the coal mill, a guide ring plate is fixed on the static air ring, castable is filled between the guide ring plate and the inner wall of the coal mill, a plurality of cover plates are evenly fixed on the guide ring plate, and the cover plates are located above the air eye.

2. The coal mill air ring guide structure according to claim 1, characterized in that: The width of the cover plate is smaller than the width of the wind eye.

3. The coal mill air ring guide structure according to claim 1, characterized in that: A reinforcing rib plate is fixedly arranged between the cover plate and the guide ring plate.

4. The coal mill air ring guide structure according to claim 1, characterized in that: The height of the guide ring plate is 10 to 20 cm.

5. The coal mill air ring guide structure according to claim 1, characterized in that: The width of the cover plate is 3 to 7 cm.

6. The coal mill air ring guide structure according to claim 1, characterized in that: There are three cover plates, and the three cover plates are arranged at equal intervals.

7. The coal mill air ring guide structure according to claim 1, characterized in that: The cover plate is arc-shaped, and the outer arc side of the cover plate is in contact with the inner wall of the guide ring plate.

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