CN113267059A

CN113267059A - Coal dust separating wheel cleaning method

Info

Publication number: CN113267059A
Application number: CN202110579965.0A
Authority: CN
Inventors: 谷茂; 董保军; 尚海涛; 朱玉田; 严帅
Original assignee: Jidong Cement Chongqing Hechuan Co ltd
Current assignee: Jidong Cement Chongqing Hechuan Co ltd
Priority date: 2021-05-26
Filing date: 2021-05-26
Publication date: 2021-08-17
Anticipated expiration: 2041-05-26
Also published as: CN113267059B

Abstract

The invention relates to the field of separating wheel cleaning, in particular to a coal dust separating wheel cleaning method, hot air in a rotary kiln is input into a separating wheel through a bent hot air pipeline, wherein the hot air pipeline comprises an air guiding pipe communicated with the rotary kiln and an air inlet pipe communicated with the separating wheel, and the connecting position of the air inlet pipe and the separating wheel is 60-90 degrees or 270-300 degrees of the separating wheel. When the technical scheme is adopted, the accumulation of raw coal in the dividing wheel is reduced.

Description

Coal dust separating wheel cleaning method

Technical Field

The invention relates to the field of separation wheel cleaning, in particular to a coal dust separation wheel cleaning method.

Background

The coal grinding system is an important component of cement kiln production, and the existing coal grinding system comprises a feed hopper, a separating wheel, a grinding chute and a coal grinding machine which are sequentially arranged from top to bottom, wherein the separating wheel comprises a shell, a rotating shaft and separating sheets which are uniformly distributed around the rotating shaft, the rotating shaft and the separating sheets are rotatably arranged in the shell, the shell is connected with the coal grinding machine through the grinding chute, and the coal grinding system directly closes the normal operation of the rotary kiln.

The separation wheel is one of key points for restricting the operation of the coal mill in the daily production process; the raw coal has large moisture which is usually between 12 and 15 percent, especially the raw coal has large moisture and low environmental temperature in winter, the raw coal is easy to accumulate in the separating wheel, the separating wheel is easy to be blocked and jumped when large blocks of the raw coal or other foreign matters are met, the mill is stopped, and the rotary kiln yield reduction and even the rotary kiln material stop accidents can be caused due to insufficient coal powder in serious cases.

Disclosure of Invention

The invention aims to provide a cleaning method for reducing or even eliminating the accumulation of raw coal in a dividing wheel by introducing hot air.

In order to achieve the purpose, the technical scheme of the invention provides a coal dust separating wheel cleaning method, hot air in a rotary kiln is input into a separating wheel through a bent hot air pipeline, wherein the hot air pipeline comprises an air guiding pipe communicated with the rotary kiln and an air inlet pipe communicated with the separating wheel, and the connecting position of the air inlet pipe and the separating wheel is 60-90 degrees or 270-300 degrees of the separating wheel.

The technical effect of the scheme is as follows: aiming at the conveying of raw coal with high humidity, hot air in the rotary kiln is conveyed into a shell of the separating wheel, the inner wall of the shell and the separating sheet are relatively dry, the coal accumulation amount is small, the area is small, and the production is controllable; wherein, hot-blast pipeline is the form of buckling, carries earlier hot-blast back down earlier and can make the dust granule in the hot-blast refluence along the induced duct, is favorable to reducing the interior deposition of air-supply line, avoids simultaneously to separating the raw coal in the wheel and mend impurity.

Because the negative pressure of the grinding chute below the dividing wheel is very high, the connecting position of the air inlet pipe and the dividing wheel is within 60-90 degrees or 270-300 degrees of the dividing wheel, hot air is not directly sucked into the grinding machine, so that the inside of the dividing wheel cannot be contacted with the hot air, the hot air is fully contacted with raw coal in the dividing wheel, the hot air can rapidly enter the grinding chute, the ventilation quantity of a hot air pipeline is ensured, the drying of the hot air on the raw coal is prevented from being influenced after the heat in the hot air pipeline is retained, and the accumulation of the raw coal in the dividing wheel is reduced.

Further, the wind in the air inlet pipe diffuses into the separation wheel. The technical effect of the scheme is as follows: is favorable for improving the contact area between the hot air and the separation wheel.

Furthermore, a cavity is arranged in the shell of the separating wheel, and wind energy in the air inlet pipe enters the cavity to heat the shell. The technical effect of the scheme is as follows: the heat transfer is beneficial to reduce the accumulation of raw coal inside the separation wheel.

Furthermore, the air volume in the air inlet pipe can be adjusted. The technical effect of the scheme is as follows: the hot air quantity can be conveniently controlled according to the moisture conditions of the raw coal of different batches.

Furthermore, a heat-insulating layer is arranged on the outer side wall of the hot air pipeline. The technical effect of the scheme is as follows: the safety of field personnel and equipment is ensured.

Furthermore, the rotating shaft of the separating wheel is hollow, the separating sheets of the separating wheel are hinged with the scraping blades, the separating sheets are provided with holes, cleaning sheets capable of plugging the holes are arranged between the adjacent separating sheets, and the scraping blades can rotate to remove plugging of the cleaning sheets on the holes. The technical effect of the scheme is as follows: the scraping sheet rotates under the action of the gravity of raw coal at the grinding chute, so that the cleaning sheets are driven to move, and the raw coal between adjacent separating sheets is conveniently cleaned; and the special fan-shaped area between the adjacent separating wheels is utilized to remove the blockage of the cleaning sheet to the pore, the hot air in the hot air pipeline can smoothly enter the coal mill through the pore and the grinding chute, and the temperature and the air quantity of the hot air after the heat in the hot air pipeline is retained can not be reduced while heating the pulverized coal on the side wall of the grinding chute, so that the drying effect is ensured; in addition, the blockage of the cleaning sheet to the hole in the rotating process of the separating sheet is not influenced, and the dust flying condition is effectively avoided.

Drawings

FIG. 1 is a schematic diagram of an embodiment of the present invention;

FIG. 2 is a schematic view of a divider wheel;

fig. 3 is a partially enlarged view of a portion a in fig. 2.

Detailed Description

The following is further detailed by way of specific embodiments:

reference numerals in the drawings of the specification include: the device comprises a hot air pipeline 1, a feed hopper 2, a separating wheel 3, a grinding chute 4, a coal mill 5, a shell 6, a rotating shaft 7, a separating sheet 8, an air guiding pipe 9, an air inlet pipe 10, a bell mouth 11, a scraping sheet 12, a cavity 13, a pore 14, a sliding rod 15, a steel wire rope 16 and shielding cloth 17.

The first embodiment is as follows:

the coal dust separating wheel cleaning method is characterized in that hot air in the rotary kiln is input into the separating wheel 3 through the bent hot air pipeline 1, and the accumulation condition of raw coal in the dividing wheel is reduced in the rotating process of the separating wheel 3.

Specifically, as shown in fig. 1, the coal mill system includes a feed hopper 2, a separating wheel 3, a milling chute 4 and a coal mill 5 which are sequentially arranged from top to bottom, as shown in fig. 2, the separating wheel 3 includes a housing 6, a rotating shaft 7 and separating sheets 8 which are uniformly distributed around the rotating shaft 7, the rotating shaft 7 and the exterior of the housing 6 are coaxially welded or connected through a flange through an output shaft of a motor fixedly mounted on a rack through bolts, that is, the rotating shaft 7 and the separating sheets 8 are rotatably arranged in the housing 6, and the housing 6 is connected with the coal mill 5 through the milling chute 4.

As shown in fig. 1, the hot air duct 1 includes an induced duct 9 communicating with the rotary kiln and an air inlet duct 10 communicating with the separating wheel 3, the connection position of the air inlet duct 10 and the separating wheel 3 is 60 ° -90 ° or 270 ° -300 ° of the separating wheel 3, and when the separating wheel 3 rotates counterclockwise in this embodiment, the connection position of the air inlet duct 10 and the separating wheel 3 is 9-10 o.

As shown in fig. 2, a bell mouth 11 is opened on the housing 6, and the air inlet pipe 10 is communicated with the inside of the separation wheel 3 at the bell mouth 11; certainly, in order to adjust the amount of wind in the air inlet pipe 10, a gate valve can be installed on the air inlet pipe 10, in addition, a cavity is formed in the shell 6 and communicated with the bell mouth 11, wind energy in the air inlet pipe 10 enters the cavity to heat the shell 6, and in addition, in order to ensure the safety of personnel, a heat insulation layer, such as a rock wool board, can be wrapped on the outer side wall of the hot air pipeline 1.

Example two:

on the basis of the first embodiment, the raw coal in the separating wheel 3 is cleaned through hot air drying, and the separating wheel 3 is convenient to clean coal powder.

Specifically, as shown in fig. 2, the rotating shaft 7 of the separating wheel 3 is hollow, as shown in fig. 3, the separating sheet 8 of the separating wheel 3 is hinged with a scraping blade 12 through a pin shaft, a cavity 13 is formed in the separating sheet 8, and a pore 14 communicated with the cavity 13 is formed in the separating sheet 8; a cleaning sheet capable of plugging the pore 14 is arranged between the adjacent separating sheets 8 in a sliding manner, specifically, the section of the cleaning sheet is in a fan shape, a through hole in a shape of Chinese character 'zhong' is formed in the side wall of the rotating shaft 7, a sliding rod 15 is arranged in the through hole in a sliding manner, one end of the sliding rod 15 is fixedly connected with the cleaning sheet, for example, welded, and a spring is sleeved on the sliding rod 15; the other end of the sliding rod 15 is fixedly connected with a steel wire rope 16, such as knotting, and the other end of the steel wire rope 16 penetrates through the side wall of the rotating shaft 7 and the separating sheet 8 and then is fixedly connected with the scraping blade 12. Alternatively, a screen cloth 17 may be pinned between the doctor blade 12 and the separator 8, and a filter mesh may be mounted at the aperture 14.

During cleaning, after hot air enters the separating wheel 3 through the hot air pipeline 1, the raw coal is dried by the hot air so as to reduce the accumulation of the raw coal inside the separating wheel 3; in the rotating process of the separating wheel 3, when the separating sheets 8 and the scraping sheets 12 rotate to the grinding chute 4, as shown in fig. 3, the scraping sheets 12 rotate under the action of the gravity of raw coal, so that the sliding rods 15 and the cleaning sheets are driven by the steel wire ropes 16 to move, and the raw coal at a dead angle between the adjacent separating sheets 8 is cleaned; after the cleaning sheets are used for removing the blockage of the holes 14 by utilizing the special fan-shaped areas between the adjacent separating wheels 3, hot air in the hot air pipeline 1 can smoothly enter the coal grinding machine 5 through the holes 14 and the grinding chute 4, and the temperature and the air quantity of the hot air after heat in the hot air pipeline 1 is retained can not be reduced when coal powder on the side wall of the grinding chute 4 is heated, so that the drying effect is ensured; in addition, after the scraping sheet 12 leaves the grinding chute 4, the cleaning sheet plugs the pore 14, so that the condition of pulverized coal dust emission is effectively avoided.

The foregoing is merely an example of the present invention and common general knowledge of known specific structures and features of the embodiments is not described herein in any greater detail. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent.

Claims

1. The coal dust separating wheel cleaning method is characterized by comprising the following steps: the hot air in the rotary kiln is input into the separating wheel through a bent hot air pipeline, wherein the hot air pipeline comprises an air guiding pipe communicated with the rotary kiln and an air inlet pipe communicated with the separating wheel, and the connecting position of the air inlet pipe and the separating wheel is 60-90 degrees or 270-300 degrees of the separating wheel.

2. The method for cleaning the pulverized coal separation wheel according to claim 1, wherein: the wind in the air inlet pipe diffuses into the separation wheel.

3. The method for cleaning the pulverized coal separation wheel according to claim 2, wherein: a cavity is arranged in the shell of the separating wheel, and wind energy in the air inlet pipe enters the cavity to heat the shell.

4. The method for cleaning the pulverized coal separation wheel according to claim 3, wherein: the air quantity in the air inlet pipe can be adjusted.

5. The method for cleaning the pulverized coal separating wheel according to claim 4, wherein: the outer side wall of the hot air pipeline is provided with a heat preservation layer.

6. The method for cleaning the pulverized coal separating wheel according to claim 5, wherein: the rotating shaft of the separating wheel is hollow, the separating sheets of the separating wheel are hinged with the scraping blades, the separating sheets are provided with holes, cleaning sheets capable of plugging the holes are arranged between the adjacent separating sheets, and the holes can be plugged by the cleaning sheets when the scraping blades rotate.