阅读说明：本技术 一种提高磨煤机碾磨效率的装置及方法 (Device and method for improving milling efficiency of coal mill ) 是由 何志瞧 寿奎原 于帅 余程 褚晓亮 郝丽娜 卢得勇 梁银河 包文东 崔庆伟 琚敏 于 2020-08-06 设计创作，主要内容包括：本发明公开了一种提高磨煤机碾磨效率的装置及方法,一种提高磨煤机碾磨效率的装置,包括磨煤机、入磨风道,磨煤机的底部设置有磨盘；磨盘上设置有多个衬板；衬板的上方均对应设置有磨辊；磨煤机工作时,原煤位于磨辊与衬板之间,被磨辊与衬板碾磨制成煤粉；一种提高磨煤机碾磨效率的装置的方法,工作方法为：当磨煤机工作时,磨辊和衬板将在磨盘上的原煤碾磨制成煤粉,由冷一次风道或热一次风道提供混合热风进入磨煤机,混合热风进入磨煤机内部携带磨辊和衬板碾磨的煤粉,送出磨煤机；本发明实现了促进磨煤机原煤磨制过程中粗细粉分离,提升碾磨效率,降低磨煤机内部煤粉循环倍率,提高磨煤机碾磨出力,降低磨煤单耗,提升磨煤机煤种适应性。(The invention discloses a device and a method for improving the grinding efficiency of a coal mill, and the device for improving the grinding efficiency of the coal mill comprises the coal mill and a grinding air inlet channel, wherein a grinding disc is arranged at the bottom of the coal mill; a plurality of lining plates are arranged on the grinding disc; grinding rollers are correspondingly arranged above the lining plates; when the coal mill works, raw coal is positioned between the grinding roller and the lining plate, and is ground into coal powder by the grinding roller and the lining plate; a method of a device for improving the milling efficiency of a coal mill comprises the following working method: when the coal mill works, raw coal on the grinding disc is ground into coal powder by the grinding roller and the lining plate, mixed hot air is provided by the cold primary air duct or the hot primary air duct and enters the coal mill, the mixed hot air enters the coal mill and carries the coal powder ground by the grinding roller and the lining plate, and the coal powder is sent out of the coal mill; according to the invention, the separation of coarse powder and fine powder in the raw coal grinding process of the coal mill is promoted, the grinding efficiency is improved, the circulation rate of the pulverized coal in the coal mill is reduced, the grinding output of the coal mill is improved, the unit consumption of the ground coal is reduced, and the coal type adaptability of the coal mill is improved.)

1. The utility model provides an improve coal pulverizer efficiency of milling which characterized in that: the device comprises a coal mill (12) and a grinding air inlet channel, wherein a grinding disc (11) is arranged at the bottom of the coal mill (12); a plurality of lining plates (10) are arranged on the grinding disc (11); grinding rollers (9) are correspondingly arranged above the lining plate (10); when the coal mill (12) works, raw coal is positioned between the grinding roller (9) and the lining plate (10), and is ground into coal powder by the grinding roller (9) and the lining plate (10);

the grinding air channel comprises a hot primary air channel (8) and a cold primary air channel (7); the hot primary air duct (8) is communicated with the bottom of the coal mill (12); the upper end of the hot primary air duct (8) is communicated with the cold primary air duct (7); introducing cold primary air into the hot primary air duct (8) through the cold primary air duct (7) to form mixed hot air;

a plough rake air pipeline (6) is arranged at an inlet at the upper part of the coal mill (12); one end of the plow harrow air duct (6) is communicated with the cold primary air duct (7) or the hot primary air duct (8), and the other end is respectively communicated with the first plow harrow air nozzle (1), the second plow harrow air nozzle (2) and the third plow harrow air nozzle (3); the plow harrow air duct (6) provides cold primary air from a cold primary air duct (7) or provides mixed hot air from a hot primary air duct (8), and then conveys the cold primary air or the mixed hot air to the first plow harrow air nozzle (1), the second plow harrow air nozzle (2) and the third plow harrow air nozzle (3), and the first plow harrow air nozzle (1), the second plow harrow air nozzle (2) and the third plow harrow air nozzle (3) sweep the raw coal and the pulverized coal which are being milled on the millstone (11) by utilizing the energy of the cold primary air or the mixed hot air to form a plow harrow function, so that the separation of coarse and fine powder in the raw coal and the pulverized coal on the millstone is promoted.

2. The device for improving the milling efficiency of a coal mill as claimed in claim 1, wherein: the number of the grinding rollers (9) is three; the first plough harrow air nozzle (1), the second plough harrow air nozzle (2) and the third plough harrow air nozzle (3) are correspondingly arranged among the three grinding rollers; the nozzle directions of the first plough harrow air nozzle (1), the second plough harrow air nozzle (2) and the third plough harrow air nozzle (3) are consistent with the rotation direction of the grinding disc (11).

3. The device for improving the milling efficiency of a coal mill as claimed in claim 2, wherein: the plough harrow air pipeline (6) is respectively communicated with the first plough harrow air nozzle (1), the second plough harrow air nozzle (2) and the third plough harrow air nozzle (3) through a plough harrow air ring pipe (5) and a plough harrow air nozzle air duct (4).

4. The device for improving the milling efficiency of a coal mill as claimed in claim 3, wherein: the bottom of the plow harrow air ring pipe (5) is respectively communicated with three plow harrow air nozzle air ducts (4); the three plough harrow air nozzle air ducts (4) are respectively communicated with the first plough harrow air nozzle (1), the second plough harrow air nozzle (2) and the third plough harrow air nozzle (3).

5. The device for improving the milling efficiency of a coal mill as claimed in claim 4, wherein: an electric door (13) is arranged on the plough harrow air pipeline (6).

6. The method for improving the milling efficiency of a coal mill as claimed in any one of claims 1 to 5, wherein: the working method comprises the following steps:

when the coal mill (12) works, raw coal on a grinding disc (11) is ground into coal powder by the grinding roller (9) and the lining plate (10), mixed hot air is provided by the cold primary air duct (7) or the hot primary air duct (8) and enters the coal mill (12), and the mixed hot air enters the coal mill (12) and carries the coal powder ground by the grinding roller (9) and the lining plate (10) and is sent out of the coal mill;

cold primary air or mixed hot air provided by the cold primary air duct (7) or the hot primary air duct (8) is sent into a first plough rake air nozzle (1), a second plough rake air nozzle (2) and a third plough rake air nozzle (3) through a plough rake air duct (6), a plough rake air ring pipe (5) and a plough rake air nozzle air duct (4) to become plough rake air;

in the process that the grinding roller (9) and the lining plate (10) grind raw coal on the grinding disc (11), the first plough harrow air nozzle (1), the second plough harrow air nozzle (2) and the third plough harrow air nozzle (3) sweep the ground raw coal and coal powder on the grinding disc (11) by using plough harrow air to form a 'plough harrow' effect, and the separation of the coarse powder and the fine powder of the raw coal and the coal powder on the grinding disc (11) is promoted.

7. The method of the device for improving the milling efficiency of the coal mill as recited in claim 6, wherein: and an electric door (13) on the plough harrow air pipeline (6) is opened before the coal mill (12) is put into operation and closed after the coal mill (12) is stopped.

Technical Field

The invention relates to a device and a method, in particular to a device and a method for improving the grinding efficiency of a coal mill.

Background

The coal mill is used as an important auxiliary device of the coal-fired power plant boiler, plays roles of milling, drying and fuel (raw coal) conveying in the operation process of the coal-fired power plant boiler, directly influences the combustion effect of the raw coal in the boiler and influences the coal consumption of the coal-fired power plant, and the fuel cost is also the main cost of the coal-fired power plant, so that the fineness of the milled particles of the raw coal directly influences the economic benefit of the coal-fired power plant.

After raw coal enters a coal mill, the raw coal is milled into fine coal powder under the pressurizing, extruding and milling effects of a grinding roller and a lining plate (arranged on a grinding disc), and the granularity of the coal powder formed by milling is different in the process that the raw coal is milled on the grinding disc, so that the fine coal powder can influence the milling effect of coarse coal powder. The coal powder stays in the coal mill for too long time, and needs to be milled for many times to be sent out of the coal mill, so that the output of the coal mill is reduced, and the power consumption of the coal mill is increased.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides a device and a method for improving the grinding efficiency of a coal mill.

In order to solve the technical problems, the invention adopts the technical scheme that: a device for improving the grinding efficiency of a coal mill comprises the coal mill and a grinding air inlet channel, wherein a grinding disc is arranged at the bottom of the coal mill; a plurality of lining plates are arranged on the grinding disc; grinding rollers are correspondingly arranged above the lining plates; when the coal mill works, raw coal is positioned between the grinding roller and the lining plate, and is ground into coal powder by the grinding roller and the lining plate;

the grinding air duct comprises a hot primary air duct and a cold primary air duct; the hot primary air duct is communicated with the bottom of the coal mill; the upper end of the hot primary air channel is communicated with the cold primary air channel; introducing cold primary air into the hot primary air channel through the cold primary air channel to form mixed hot air;

a plow harrow air pipeline is arranged at an inlet at the upper part of the coal mill; one end of the plow harrow air duct is communicated with the cold primary air duct or the hot primary air duct, and the other end of the plow harrow air duct is respectively communicated with the first plow harrow air nozzle, the second plow harrow air nozzle and the third plow harrow air nozzle; the plow harrow air duct provides cold primary air or provides mixed hot air through the hot primary air duct from the cold primary air duct 7, and then conveys the cold primary air or the mixed hot air to the plow harrow air nozzle I, the plow harrow air nozzle II and the plow harrow air nozzle III, and the plow harrow air nozzle I, the plow harrow air nozzle II and the plow harrow air nozzle III sweep the raw coal and the pulverized coal which are being milled on the mill by utilizing the energy of the cold primary air or the mixed hot air to form a plow harrow function, so that the separation of the raw coal on the mill from the coarse powder and the fine powder in the pulverized coal is promoted.

Furthermore, the number of the grinding rollers is three; the first plough harrow air nozzle, the second plough harrow air nozzle and the third plough harrow air nozzle are correspondingly arranged among the three grinding rollers; the nozzle directions of the first plough harrow air nozzle, the second plough harrow air nozzle and the third plough harrow air nozzle are consistent with the rotation direction of the grinding disc.

Furthermore, the plow harrow air pipeline is respectively communicated with the first plow harrow air nozzle, the second plow harrow air nozzle and the third plow harrow air nozzle through a plow harrow air ring pipe and a plow harrow air nozzle air duct.

Furthermore, the bottom of the plow harrow air ring pipe is respectively communicated with three plow harrow air nozzle air channels; the three plough harrow air nozzle air ducts are respectively communicated with the first plough harrow air nozzle, the second plough harrow air nozzle and the third plough harrow air nozzle.

Furthermore, an electric door is arranged on the plow harrow air pipeline.

A method of a device for improving the milling efficiency of a coal mill comprises the following working method:

when the coal mill works, raw coal on the grinding disc is ground into coal powder by the grinding roller and the lining plate, mixed hot air is provided by the cold primary air duct or the hot primary air duct and enters the coal mill, the mixed hot air enters the coal mill and carries the coal powder ground by the grinding roller and the lining plate, and the coal powder is sent out of the coal mill;

the cold primary air or the mixed hot air provided by the cold primary air duct or the hot primary air duct is sent into a first plough rake air nozzle, a second plough rake air nozzle and a third plough rake air nozzle through a plough rake air duct, a plough rake air ring pipe and a plough rake air nozzle air duct to become plough rake air;

in the process that the grinding roller and the lining plate grind the raw coal on the grinding disc, the first plow harrow air nozzle, the second plow harrow air nozzle and the third plow harrow air nozzle sweep the ground raw coal and the pulverized coal on the grinding disc by utilizing plow harrow air to form a plow harrow function, so that the separation of the coarse powder and the fine powder of the raw coal and the pulverized coal on the grinding disc is promoted.

Furthermore, an electric door on the plough rake air pipeline is opened before the coal mill is put into operation and is closed after the coal mill is stopped.

The invention uses cold primary air or mixed hot air to sweep the raw coal and the coal powder being milled on the millstone through the plow harrow air nozzle, thereby forming the action of 'plow harrow', promoting the separation of the raw coal being milled on the millstone from the coarse and fine coal powder in the coal powder, improving the milling efficiency, improving the milling output of the coal mill, reducing the circulation rate of the coal powder in the coal mill, reducing the power consumption of the coal mill and further improving the coal type adaptability of the coal mill.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic top view of the structure of fig. 1.

In the figure: 1. a first plow harrow air nozzle; 2. a second plow harrow air nozzle; 3. a third plow harrow air nozzle; 4. a plough rake air nozzle air duct; 5. plowing and harrowing a wind ring pipe; 6. plowing and raking an air pipeline; 7. a cold primary air duct; 8. a hot primary air duct; 9. grinding the roller; 10. a liner plate; 11. a grinding disc; 12. a coal mill; 13. provided is an electric door.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

The device for improving the grinding efficiency of the coal grinding mill as shown in fig. 1 and fig. 2 comprises a coal grinding mill 12 and a grinding air inlet channel, wherein a grinding disc 11 is arranged at the bottom of the coal grinding mill 12; a plurality of lining plates 10 are arranged on the grinding disc 11; grinding rollers 9 are correspondingly arranged above the lining plate 10; when the coal mill 12 works, raw coal is positioned between the grinding roller 9 and the lining plate 10, and is ground into coal powder by the grinding roller 9 and the lining plate 10;

the grinding air duct comprises a hot primary air duct 8 and a cold primary air duct 7; the hot primary air duct 8 is communicated with the bottom of the coal mill 12; the upper end of the hot primary air duct 8 is communicated with the cold primary air duct 7; introducing cold primary air into the hot primary air duct 8 through the cold primary air duct 7 to form mixed hot air;

a plow harrow air pipeline 6 is arranged at an inlet at the upper part of the coal mill 12; one end of the plow harrow air duct 6 is communicated with the cold primary air duct 7 or the hot primary air duct 8, and the other end is respectively communicated with the first plow harrow air nozzle 1, the second plow harrow air nozzle 2 and the third plow harrow air nozzle 3; the plow harrow air duct 6 provides cold primary air from the cold primary air duct 7 or provides mixed hot air from the hot primary air duct 8, and then conveys the cold primary air or the mixed hot air to the plow harrow air nozzle 1, the plow harrow air nozzle 2 and the plow harrow air nozzle 3, and the plow harrow air nozzle 1, the plow harrow air nozzle 2 and the plow harrow air nozzle 3 purge the raw coal and the coal powder being milled on the millstone 11 by using the energy of the cold primary air or the mixed hot air to form a plow harrow function, so that the separation of the raw coal on the millstone from the coarse powder and the coarse powder in the coal powder is promoted.

As shown in fig. 2, three grinding rollers 9 are provided; the first plough harrow air nozzle 1, the second plough harrow air nozzle 2 and the third plough harrow air nozzle 3 are correspondingly arranged among the three grinding rollers; the nozzle directions of the first plough harrow air nozzle 1, the second plough harrow air nozzle 2 and the third plough harrow air nozzle 3 are all consistent with the rotation direction of the grinding disc 11.

The plow harrow air duct 6 is respectively communicated with the first plow harrow air nozzle 1, the second plow harrow air nozzle 2 and the third plow harrow air nozzle 3 through a plow harrow air ring duct 5 and a plow harrow air nozzle air duct 4. An electric door 13 is arranged on the plow harrow air duct 6.

The bottom of the plow harrow air ring pipe 5 is respectively communicated with three plow harrow air nozzle air ducts 4; the three plough harrow air nozzle air ducts 4 are respectively communicated with a first plough harrow air nozzle 1, a second plough harrow air nozzle 2 and a third plough harrow air nozzle 3.

A method of a device for improving the milling efficiency of a coal mill comprises the following working method:

when the coal mill 12 works, raw coal on the grinding disc 11 is ground into coal powder by the grinding roller 9 and the lining plate 10, mixed hot air is provided by the cold primary air duct 7 or the hot primary air duct 8 and enters the coal mill 12, the mixed hot air enters the coal mill 12 and carries the coal powder ground by the grinding roller 9 and the lining plate 10, and the coal powder is sent out of the coal mill;

the cold primary air or the mixed hot air provided by the cold primary air channel 7 or the hot primary air channel 8 is sent to a first plough rake air nozzle 1, a second plough rake air nozzle 2 and a third plough rake air nozzle 3 through a plough rake air channel 6, a plough rake air ring pipe 5 and a plough rake air nozzle air channel 4 to become plough rake air;

in the process that the grinding roller 9 and the lining plate 10 grind raw coal on the grinding disc 11, the first plow harrow air nozzle 1, the second plow harrow air nozzle 2 and the third plow harrow air nozzle 3 sweep the ground raw coal and coal powder on the grinding disc 11 by utilizing plow harrow air to form a plow harrow function, so that the separation of the coarse powder and the coarse powder of the raw coal and the coal powder on the grinding disc 11 is promoted.

The plow harrow air duct 6 is communicated with the cold primary air duct 7 or the hot primary air duct 8, then enters the coal mill 12, and then enters the plow harrow air nozzle through the plow harrow air ring duct 5 and the plow harrow air nozzle air duct 4, and the plow harrow air nozzle uses cold primary air or mixed hot air to sweep the raw coal and the pulverized coal being milled on the millstone, so that the plow harrow function is formed, and the separation of coarse powder and fine powder in the raw coal and the pulverized coal on the millstone is promoted. In the process of grinding the raw coal, the raw coal on the grinding disc 11 is ploughed by the kinetic energy of the ploughing wind.

The plough rake air quantity adjusting mode is as follows: the plough rake wind quantity does not need to be directly adjusted, and the electric door 13 is opened and closed along with the operation condition of the coal mill 12. The electric door 13 on the plough rake wind pipeline 6 is opened before the coal mill 12 is put into operation and is closed after the coal mill 12 is stopped. Before the coal mill 12 is put into operation, the plough harrow air electric door 13 is opened firstly; and after the coal mill 12 stops running, closing the plow harrow air electric door 13.

The invention can realize that the plough harrow air nozzle is used for purging the raw coal and the coal powder which are being milled on the mill disc during the operation of the current medium-speed coal mill, thereby forming the plough harrow function, promoting the separation of the coarse coal powder and the fine coal powder, improving the milling efficiency, further improving the milling output of the coal mill, reducing the operation power consumption of the coal mill, simultaneously improving the quality of the coal powder entering a boiler, improving the combustion stability and the economical efficiency, further reducing the coal consumption of coal-fired power generation, reducing the fuel cost of a coal-fired power station and improving the operational benefit of the coal-fired power station.

The above embodiments are not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make variations, modifications, additions or substitutions within the technical scope of the present invention.