Efficient air ring of coal mill

Abstract

The utility model discloses an efficient air ring of a coal mill, which relates to the technical field of air rings of coal mills and comprises a static ring seat, a static ring body and a nozzle moving ring, the nozzle moving ring is arranged on one side below the static ring body and comprises an inner ring plate, an outer ring plate and a nozzle body, and the nozzle body is arranged between the inner ring plate and the outer ring plate. A first sealing area is arranged between the top of the outer ring plate and the static ring body, a second sealing area is arranged between the outer side of the upper end of the outer ring plate and the static ring base, a first sealing piece is arranged in the first sealing area, and a second sealing piece is arranged in the second sealing area. According to the utility model, the vertical gap sealing between the movable ring and the static ring of the air ring in the prior art is changed into the radial gap and the axial gap formed by the first sealing element and the second sealing element, so that the flow of primary air which directly enters a milling area without being adjusted by the air ring and is mixed with pulverized coal is reduced, namely the air leakage rate is reduced; and the problem that the gap between the movable ring and the static ring becomes large due to abrasion can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of coal mill air rings, in particular to an efficient coal mill air ring. Background Art

[0002] The coal mill air ring, also known as the air duct ring or cylinder, is an annular device that draws out the dust air flow of the coal mill by wind pressure. It is usually installed on the exhaust pipe of the coal mill and is made of materials such as metal or ceramic. The air ring generally consists of a framework, a deflector, a sealing ring, connecting bolts, high-temperature ceramics, etc., and is generally divided into three layers. The inner and outer layers are each a sealing ring, and the middle layer is a wind guide plate for guiding air from one end to the other end to play a guiding role.

[0003] The vertical clearance between the moving and static rings of the coal mill is one of the important indicators for controlling the discharge of pebble coal. Affected by the deterioration of coal quality, the moving and static clearances are easily worn, resulting in a gradual increase in the clearance. And affected by the deterioration of coal quality, the nozzles of the moving rings are worn, resulting in an increase in the flow area, causing the internal flow field of the coal mill to be disordered. It is necessary to increase the primary air volume to improve the powder-carrying capacity, resulting in a decrease in the primary air efficiency. At the same time, it will cause an increase in the discharge of pebble coal. The large discharge of pebble coal increases the labor intensity of the slag discharge personnel, pollutes the surrounding environment, and affects the physical health of the operating personnel. Therefore, the utility model proposes an efficient coal mill air ring to solve the deficiencies in the prior art. Summary of the Utility Model

[0004] Aiming at the above problems, the purpose of the utility model is to provide an efficient coal mill air ring, which seals the vertical clearance between the moving and static rings of the existing air ring and changes it into two parts: a radial clearance and an axial clearance formed by a first seal and a second seal, reducing the flow rate of the primary air that directly enters the grinding area and mixes with the pulverized coal without passing through the adjustment of the air ring, that is, reducing the air leakage rate, and can also reduce the problem of the increase in the clearance between the moving and static rings caused by wear.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] An efficient air ring for a coal mill, comprising a stationary ring seat, a stationary ring body and a nozzle moving ring. The stationary ring seat is arranged on a support ring inside the housing of the coal mill. The stationary ring body is arranged on the top of the stationary ring seat. A nozzle moving ring is arranged on one side below the stationary ring body. The nozzle moving ring includes an inner ring plate, an outer ring plate and a nozzle body. One side above the inner ring plate is fixedly arranged on the top of a grinding ring tray. The outer ring plate is concentric with the inner ring plate. Nozzle bodies are arranged between the inner ring plate and the outer ring plate. Multiple groups of nozzle bodies are arranged around the outer wall of the inner ring plate, and the nozzle bodies and the inner ring plate are integrally formed. The upper end of the outer ring plate is located on one side below the stationary ring body, and a first sealing area is arranged between the top of the outer ring plate and the stationary ring body. A second sealing area is arranged between the outer side of the upper end of the outer ring plate and the stationary ring seat. A first sealing member is arranged in the first sealing area, and a second sealing member is arranged in the second sealing area.

[0007] A further improvement lies in that: a stationary ring cover plate is arranged on the top of the stationary ring seat. First fixing holes are arranged on the stationary ring cover plate. There are multiple first fixing holes, and first fixing bolts are arranged in all of the multiple first fixing holes. The stationary ring cover plate, the stationary ring body and the stationary ring seat are connected by the first fixing bolts.

[0008] A further improvement lies in that: a material blocking ring is arranged on the top of the inner ring plate. Second fixing holes are arranged on the material blocking ring. There are multiple second fixing holes, and second fixing bolts are arranged in all of the multiple second fixing holes. The material blocking ring, the inner ring plate and the grinding ring tray are connected by the second fixing bolts.

[0009] A further improvement lies in that: the upper inner side of the stationary ring body is a slope surface, and the included angle between the slope surface and the top of the stationary ring body is 40 - 50°.

[0010] A further improvement lies in that: a first sealing installation groove is arranged at the bottom of the stationary ring body in the first sealing area. The first sealing member is connected to the first sealing installation groove through a first connecting bolt.

[0011] A further improvement lies in that: a second sealing installation groove is arranged on the stationary ring seat. The second sealing member is connected to the second sealing installation groove through a second connecting bolt.

[0012] The beneficial effects of the present utility model are as follows: between the top of the outer ring plate and the static ring body of the present utility model, there is a first sealing area, between the outer side of the upper end of the outer ring plate and the static ring seat, there is a second sealing area, a first sealing member is arranged in the first sealing area, a second sealing member is arranged in the second sealing area, and the vertical gap between the moving and static rings of the air ring in the prior art is sealed and changed into two parts, namely a radial gap and an axial gap formed by the first sealing member and the second sealing member, reducing the flow rate of the primary air that directly enters the grinding area and mixes with the pulverized coal without passing through the adjustment of the air ring, that is, reducing the air leakage rate, increasing the flow rate of the primary air after passing through the adjustment of the air ring, improving the powder output efficiency, and reducing the problem of the gap between the moving and static rings becoming larger due to wear. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a partial sectional three-dimensional schematic diagram of the structure of the present utility model;

[0014] Figure 2 is a top view schematic diagram of the structure of the present utility model;

[0015] Figure 3 is a partial three-dimensional schematic diagram of the structure of the moving ring of the nozzle of the present utility model;

[0016] Figure 4 For the present utility model Figure 1 is a partial enlarged schematic diagram of the structure at A in;

[0017] Figure 5 is a schematic diagram of the structure of the nozzle body of the present utility model.

[0018] Wherein: 1, static ring seat; 2, static ring body; 201, inclined plane; 3, moving ring of nozzle; 301, inner ring plate; 302, outer ring plate; 303, nozzle body; 4, support ring; 5, first sealing member; 6, second sealing member; 7, static ring cover plate; 8, first fixing bolt; 9, material blocking ring; 10, second fixing bolt; 11, first sealing installation groove; 12, first connecting bolt; 13, second sealing installation groove; 14, second connecting bolt; 15, grinding ring tray. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] In order to deepen the understanding of the present utility model, the following will further describe the present utility model in detail in conjunction with embodiments. These embodiments are only used to explain the present utility model and do not constitute a limitation on the protection scope of the present utility model.

[0020] According to Figures 1-5As shown in the figure, this embodiment proposes a high-efficiency wind ring for a coal mill, which includes a static ring seat 1, a static ring body 2, and a nozzle moving ring 3. The static ring seat 1 is arranged on a support ring 4 inside the coal mill housing. The static ring body 2 is arranged on the top of the static ring seat 1. A nozzle moving ring 3 is arranged on one side below the static ring body 2. The nozzle moving ring 3 includes an inner ring plate 301, an outer ring plate 302, and a nozzle body 303. One side above the inner ring plate 301 is fixedly arranged on the top of a grinding ring tray 15. The outer ring plate 302 is concentric with the inner ring plate 301. A nozzle body 303 is arranged between the inner ring plate 301 and the outer ring plate 302. Multiple groups of the nozzle bodies 303 are arranged around the outer wall of the inner ring plate 301, and the nozzle body 303 and the inner ring plate 301 are integrally formed. The nozzle body 303 of the present utility model adopts a twisted extrusion profile design. The outer wall of the nozzle body 303 is integrated with the inner ring plate 301, which reduces the influence of gap air leakage on the primary air efficiency. According to the Venturi principle, the outlet velocity of the moving ring can be increased under the same primary air volume. The wind speed gradually increases from the inlet to the outlet of the moving ring, and the wind speed at the throat of the moving ring will reach the maximum state; it enhances the mixing effect of the primary air on the pulverized coal, increases the concentration of the pulverized coal in the primary air, makes the pulverized coal mix more evenly with the primary air in the same time, and more pulverized coal is carried by the primary air in the same time, that is, the powder output efficiency is improved, and the output of the coal mill is increased; the upper end of the outer ring plate 302 is located on one side below the static ring body 2, and a first sealing area is arranged between the top of the outer ring plate 302 and the static ring body 2. A second sealing area is arranged between the outer side of the upper end of the outer ring plate 302 and the static ring seat 1. A first sealing member 5 is arranged in the first sealing area, and a second sealing member 6 is arranged in the second sealing area. Since during the normal operation of the coal mill, a part of the primary air directly enters the grinding area and mixes with the pulverized coal without being adjusted by the wind ring device, thus reducing the uniformity of the mixing of the primary air and the pulverized coal. Therefore, the first sealing member 5 and the second sealing member 6 are provided to seal the vertical gap between the static and moving rings of the wind ring in the prior art into two parts, namely a radial gap and an axial gap formed by the first sealing member 5 and the second sealing member 6, reducing the flow rate of the primary air that directly enters the grinding area and mixes with the pulverized coal without passing through the wind ring adjustment, that is, reducing the air leakage rate, increasing the flow rate of the primary air after passing through the wind ring adjustment, and improving the powder output efficiency.

[0021] A static ring cover plate 7 is arranged on the top of the static ring seat 1. First fixing holes are arranged on the static ring cover plate 7. There are multiple first fixing holes, and first fixing bolts 8 are arranged in all the first fixing holes. The static ring cover plate 7, the static ring body 2, and the static ring seat 1 are connected by the first fixing bolts 8.

[0022] A material blocking ring 9 is provided at the top of the inner ring plate 301. A plurality of second fixing holes are provided on the material blocking ring 9. Second fixing bolts 10 are provided in the plurality of second fixing holes. The material blocking ring 9, the inner ring plate 301 and the grinding ring tray 15 are connected by the second fixing bolts 10.

[0023] Above the inner side of the stationary ring body 2 is a slope surface 201. The included angle between the slope surface 201 and the top of the stationary ring body 2 is 45°.

[0024] A first sealing installation groove 11 is provided at the bottom of the stationary ring body 2 in the first sealing area. The first sealing member 5 is connected to the first sealing installation groove 11 by a first connecting bolt 12. Through this setting, the convenient disassembly and installation of the first sealing member 5 can be realized.

[0025] A second sealing installation groove 13 is provided on the stationary ring seat 1. The second sealing member 6 is connected to the second sealing installation groove 13 by a second connecting bolt 14. Through this setting, the convenient disassembly and installation of the second sealing member 6 can be realized.

[0026] In the present utility model, a first sealing area is provided between the top of the outer ring plate 302 and the stationary ring body 2, and a second sealing area is provided between the outer side of the upper end of the outer ring plate 302 and the stationary ring seat 1. A first sealing member 5 is provided in the first sealing area, and a second sealing member 6 is provided in the second sealing area. The vertical gap between the stationary and moving rings of the air ring in the prior art is sealed and changed into two parts, namely a radial gap and an axial gap formed by the first sealing member 5 and the second sealing member 6, reducing the flow rate of the primary air that directly enters the grinding area and mixes with the pulverized coal without passing through the adjustment of the air ring, that is, reducing the air leakage rate, increasing the flow rate of the primary air after passing through the adjustment of the air ring, improving the powder output efficiency, and reducing the problem of the increase in the gap between the stationary and moving rings due to wear.

[0027] The above shows and describes the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. An efficient wind ring for a coal mill, characterized in that: It includes a stationary ring seat (1), a stationary ring body (2) and a nozzle moving ring (3). The stationary ring seat (1) is arranged on a support ring (4) inside the mill housing. The stationary ring body (2) is arranged on the top of the stationary ring seat (1). A nozzle moving ring (3) is arranged on one side below the stationary ring body (2). The nozzle moving ring (3) includes an inner ring plate (301), an outer ring plate (302) and a nozzle body (303). One side above the inner ring plate (301) is fixedly arranged on the top of a grinding ring tray (15). The outer ring plate (302) is concentric with the inner ring plate (301). A nozzle body (303) is arranged between the inner ring plate (301) and the outer ring plate (302). Multiple groups of the nozzle body (303) are arranged around the outer wall of the inner ring plate (301), and the nozzle body (303) and the inner ring plate (301) are integrally formed. The upper end of the outer ring plate (302) is located on one side below the stationary ring body (2), and a first sealing area is arranged between the top of the outer ring plate (302) and the stationary ring body (2). A second sealing area is arranged between the outer side of the upper end of the outer ring plate (302) and the stationary ring seat (1). A first sealing member (5) is arranged in the first sealing area, and a second sealing member (6) is arranged in the second sealing area.

2. The high-efficiency air ring of a coal mill according to claim 1, characterized in that: A stationary ring cover plate (7) is arranged on the top of the stationary ring seat (1). First fixing holes are arranged on the stationary ring cover plate (7), and there are multiple first fixing holes. First fixing bolts (8) are arranged in all the multiple first fixing holes. The stationary ring cover plate (7), the stationary ring body (2) and the stationary ring seat (1) are connected by the first fixing bolts (8).

3. The high-efficiency wind ring of a coal mill according to claim 1, characterized in that: A material blocking ring (9) is arranged on the top of the inner ring plate (301). Second fixing holes are arranged on the material blocking ring (9), and there are multiple second fixing holes. Second fixing bolts (10) are arranged in all the multiple second fixing holes. The material blocking ring (9), the inner ring plate (301) and the grinding ring tray (15) are connected by the second fixing bolts (10).

4. The high-efficiency wind ring of a coal mill according to claim 1, characterized in that: The upper inner side of the stationary ring body (2) is a slope surface (201), and the included angle between the slope surface (201) and the top of the stationary ring body (2) is 40 - 50°.

5. The high-efficiency wind ring of a coal mill according to claim 1, characterized in that: A first sealing installation groove (11) is arranged at the bottom of the stationary ring body (2) at the first sealing area. The first sealing member (5) is connected with the first sealing installation groove (11) through a first connecting bolt (12).

6. The high-efficiency wind ring of a coal mill according to claim 1, characterized in that: A second sealing installation groove (13) is arranged on the stationary ring seat (1). The second sealing member (6) is connected with the second sealing installation groove (13) through a second connecting bolt (14).

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