Anti-blocking coal dropping pipe of coal mill

Abstract

The utility model relates to the technical field of industrial equipment, in particular to an anti-blocking coal dropping pipe of a coal mill, which comprises a coal receiving pipe, a transition pipe and a coal dropping main pipe which are sequentially connected from top to bottom, and the inner diameter of a top port of the transition pipe is larger than that of a bottom port of the transition pipe; a purging device is arranged on the transition pipe, and the output end of the purging device extends into the transition pipe; the coal drop pipe is composed of a three-section structure, transition between the coal receiving pipe and the coal drop main pipe is smoother by arranging the transition pipe, and the situation that raw coal is blocked in the coal drop pipe due to raw coal retention and clamping caused by friction between the raw coal and the coal drop pipe is avoided; meanwhile, the purging device is arranged in the transition pipe, air can be blown into the transition pipe in the working process, so that an air film exists between raw coal and the inner wall of the transition pipe, online unblocking of the coal falling pipe in the coal mill is achieved, faults such as shutdown caused by blocking of the coal falling pipe are avoided, normal operation of equipment is guaranteed, meanwhile, stable and reliable production is guaranteed, and the service life of the coal mill is prolonged. The actual production requirements are met.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial equipment, in particular to an anti-blocking coal drop pipe of a coal mill. Background Art

[0002] In industrial production, the coal mill is used to receive raw coal from the coal feeder and grind the raw coal into coal powder for supplying to the burner for combustion.

[0003] A coal drop pipe is provided in the coal mill for delivering the raw coal from the coal feeder to the inside of the coal mill. In the actual working process, there is a problem of raw coal being blocked in the coal drop pipe. Specifically, due to the rough surface of the raw coal and the rough inner wall of the coal drop pipe, the friction between the raw coal and the coal drop pipe is relatively large, resulting in part of the raw coal being retained and blocked in the coal drop pipe. Moreover, when the moisture content of the raw coal is high (over 14%), the raw coal is very easy to adhere to the inner wall of the coal drop pipe. At the same time, the coal drop pipe is very easy to dry and firmly adhere to the inner wall of the coal drop pipe after being subjected to the hot air in the coal mill, so that the coal drop channel of the coal drop pipe is gradually reduced, thereby blocking the coal drop pipe, resulting in the inability to feed the raw coal normally, and easily leading to problems such as the combustion boiler jumping. On the one hand, it is easy to cause equipment damage and increase maintenance and repair costs. On the other hand, manual dredging operations are required, and shutdown for maintenance increases the difficulty of operations and reduces production efficiency.

[0004] Although, the Chinese utility model patent with publication number CN219943132U discloses a coal mill coal chute dredging device, including multiple dredging devices that are detachably connected at the head and tail, the dredging device includes a support rod, a guide ring coaxially arranged with the support rod, a connecting rod for connecting the guide ring and the support rod, a clamping plate arranged on the side wall of the support rod, and a high-pressure water pipe; the clamping plate is used to clamp the high-pressure water pipe, and the support rod is hinged with the adjacent support rod; through this device, it can extend to the interior of the coal chute and clean the inner wall of the coal chute by spraying high-pressure water.

[0005] Although the above-mentioned device can clean the coal drop pipe, when using the device for cleaning, on the one hand, it is necessary to shut down the machine and clean the coal drop pipe separately, so that the burner also needs to be shut down and wait, which leads to reduced work efficiency; on the other hand, the inner wall of the coal drop pipe is cleaned by high-pressure water, so that the raw coal and water are mixed and cannot participate in combustion. At the same time, the coal drop pipe needs to wait for it to dry before use, which further increases the downtime and reduces production efficiency. Utility Model Content

[0006] The utility model aims to provide a coal mill anti-blocking coal drop pipe to solve the problem that the coal drop pipe in the current coal mill is easily blocked and cannot be cleaned online.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A coal pulverizer anti-blocking coal drop pipe comprises a coal receiving pipe, a transition pipe and a coal drop main pipe connected in sequence from top to bottom, wherein the inner diameter of the top port of the transition pipe is larger than the inner diameter of the bottom port of the transition pipe; a purge device is provided on the transition pipe, and the output end of the purge device extends to the interior of the transition pipe.

[0009] It is further defined that the top port of the coal receiving pipe is square, the bottom port of the coal receiving pipe is circular, and the side length of the top port of the coal receiving pipe is greater than the inner diameter of the bottom port of the coal receiving pipe.

[0010] It is further defined that the inner diameter of the top port of the transition pipe is 450 mm to 500 mm, and the inner diameter of the bottom port of the transition pipe is 370 mm to 380 mm.

[0011] It is further defined that the purge device includes an air inlet pipe, an air supply pipe and a plurality of bronchial pipes, the air supply pipe is sleeved on the outside of the transition pipe, the outside of the air supply pipe is connected to the air inlet pipe, one end of the bronchial pipe is connected to the inside of the air supply pipe, and the other end of the bronchial pipe passes through the transition pipe and extends to the inside of the transition pipe.

[0012] It is further defined that the plurality of bronchi are circumferentially arranged at equal intervals around the axis of the transition tube.

[0013] It is further defined that the number of the bronchi is 4 to 8.

[0014] It is further defined that the bronchus is arranged to be inclined downward.

[0015] It is further defined that the angle between the axis of the bronchus and the tangent of the bronchus at the connection position of the bronchus is less than 90°.

[0016] It is further defined that the coal connecting pipe is an integrated structure.

[0017] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0018] 1. The utility model coal drop pipe is composed of a three-section structure. The transition pipe is arranged to make the transition between the coal receiving pipe and the coal drop main pipe smoother, thereby avoiding the friction between the raw coal and the coal drop pipe causing the raw coal to be retained and stuck, causing the raw coal to be blocked in the coal drop pipe; at the same time, a purge device is arranged in the transition pipe, which can blow air into the transition pipe during operation, so that there is an air film between the raw coal and the inner wall of the transition pipe, thereby realizing online clearing of the coal drop pipe in the coal mill, avoiding failures such as shutdown caused by blockage of the coal drop pipe, ensuring the normal operation of the equipment, and at the same time ensuring stable and reliable production to meet actual production needs.

[0019] 2. The utility model provides a plurality of bronchial tubes, and sets the bronchial tubes to be tilted downward and / or deflected, so as to provide a downward force on the raw coal in the coal drop pipe, so that the raw coal can pass through quickly, further avoiding blockage of the coal drop pipe and improving the anti-blockage effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0021] Figure 2 This is a schematic diagram of the top view structure of the transition tube of the utility model;

[0022] In the figure: 1- coal connecting pipe; 2- transition pipe; 3- coal dropping main pipe; 4- purge device; 5- air inlet pipe; 6- air supply pipe; 7- bronchial pipe. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only part of the embodiments of the present utility model, not all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present utility model.

[0024] The existing coal drop pipe comprises a coal receiving pipe 1 and a coal drop main pipe 3 connected to the coal receiving pipe 1, and the coal receiving pipe 1 is formed by welding a plurality of steel plates.

[0025] In actual work, due to the high water content of the raw coal, the coal drop pipe is often blocked and the coal cannot be dropped normally. When clearing the blockage, it is often because the transition between the coal receiving pipe 1 and the coal drop main pipe 3 is not smooth. At the same time, there are too many welds on the inner wall of the coal receiving pipe 1, which increases the friction of the inner wall, reduces the feeding speed of the raw coal, and increases the accumulation of coal powder, which causes the blockage position to be mostly located at the connection position between the coal receiving pipe 1 and the coal drop main pipe 3 of the coal drop pipe.

[0026] Example 1

[0027] refer to Figure 1 The present embodiment provides a coal mill anti-blocking coal drop pipe, comprising a coal receiving pipe 1, a transition pipe 2 and a coal drop main pipe 3 connected in sequence from top to bottom, wherein the transition pipe 2 is a truncated cone-shaped structure with an inner diameter of a top port larger than an inner diameter of a bottom port, so that the connection transition between the coal receiving pipe 1 and the coal drop main pipe 3 is smoother, avoiding obstruction of the raw coal by the edges and corners of the transition part, thereby allowing the raw coal to pass more smoothly and preventing the coal drop pipe from being blocked.

[0028] The inner diameter of the top port of the transition pipe 2 can be selected to be 450mm~500mm, preferably 478mm; the inner diameter of the bottom port of the transition pipe 2 can be selected to be 370mm~380mm, preferably 377mm. The transition pipe 2 is a concentric reducer pipe. The diameters of the top port of the transition pipe 2 and the bottom port of the coal receiving pipe 1 are increased to facilitate the falling of more raw coal and avoid congestion of raw coal caused by small diameters; the bottom port of the transition pipe 2 and the inner diameter of the coal dropping main pipe 3 remain unchanged with the existing structure, avoiding modification of the coal dropping main pipe 3 and adapting to its installation and modification in the coal mill, reducing costs and having a wider range of applications.

[0029] The top port of the coal receiving pipe 1 can be selected as a square structure, and the bottom port of the coal receiving pipe 1 can be selected as a circular structure, which is convenient for connecting the coal receiving pipe 1 with the top of the transition pipe 2, while avoiding blockage caused by the presence of sharp edges in the connection to slow down the fall of the raw coal.

[0030] The coal receiving pipe 1 is preferably integrally formed by casting to avoid the weld increasing the friction between the raw coal and the raw coal, and reduce the adhesion effect between the raw coal and the inner wall of the coal receiving pipe 1, thereby further preventing the coal drop pipe from being blocked.

[0031] To further illustrate, the coal receiving pipe 1 can be made of the rare earth alloy ZG40Cr material to improve the structural strength of the coal receiving pipe 1, reduce the friction coefficient of the inner wall of the coal receiving pipe 1, and further improve the anti-blocking effect of the coal drop pipe; the transition pipe 2 can also be made of the rare earth alloy ZG40Cr material.

[0032] Example 2

[0033] refer to Figure 1 and Figure 2 On the basis of Example 1, the coal mill anti-blocking coal drop pipe provided in this embodiment also includes a purging device 4, which is arranged on the transition pipe 2, and the air inlet end of the purging device 4 is connected to the compressed air source, and the air outlet end of the purging device 4 extends to the inside of the transition pipe 2, which is used to purge the raw coal accumulated in the transition pipe 2 to prevent the raw coal from accumulating in the transition pipe 2 and sticking to the transition pipe 2, thereby further realizing active online anti-blocking of the coal drop pipe, further improving the anti-blocking effect, and meeting actual work needs.

[0034] To further explain, the purging device 4 can select multiple purging mechanisms extending from the outside of the coal mill to the inside of the transition pipe 2. Each purging mechanism can independently control the release of high-pressure gas. When in use, the purging mechanism can be switched on and off to clean the raw coal and coal slag accumulated and / or adhered in the transition pipe 2, thereby achieving online blockage clearing.

[0035] The purging device 4 can also optionally include an air intake pipe 5, an air supply pipe 6 and multiple bronchial pipes 7, wherein one end of the air intake pipe 5 extends to the outside of the coal mill and is connected to a compressed air source, such as an air compressor, to provide high-pressure air; the other end of the air intake pipe 5 is connected to the air supply pipe 6, and the air supply pipe 6 is connected to all the bronchial pipes 7. High-pressure air is provided to all the bronchial pipes 7 through an air supply pipe 6, so that all the bronchial pipes 7 can perform high-pressure purge on the inside of the transition pipe 2 to clear the blockage in the coal drop pipe and prevent the blockage of the coal drop pipe, thereby avoiding production stagnation caused by the blockage of the coal drop pipe, thereby meeting the actual production needs.

[0036] Specifically, the air supply pipe 6 is a circular ring structure, and the air supply pipe 6 is sleeved on the outside of the transition pipe 2. A plurality of bronchial pipes 7 are equidistantly arranged around the axis of the air supply pipe 6. One end of the bronchial pipe 7 is connected to the air supply pipe 6, and the other end of the bronchial pipe 7 passes through the pipe wall of the transition pipe 2 and extends to the interior of the transition pipe 2 to blow and clean the interior of the transition pipe 2, thereby realizing online cleaning and anti-blocking.

[0037] The number of the bronchial pipes 7 can be selected to be multiple, for example, 4 to 8, and 6 are taken as an example for illustration. The bronchial pipes 7 are sealed with the transition pipe 2 to prevent fly ash from overflowing to the outside of the coal drop pipe and reducing the service life of the coal mill.

[0038] It is further explained that the bronchial pipes 7 are all arranged to be inclined downward, that is, the angle between the bronchial pipes 7 and the axis of the transition pipe 2 in the vertical direction is less than 90°. On the one hand, the damage to the bronchial pipes 7 caused by the direct impact between the raw coal and the bronchial pipes 7 is reduced, the actual service life is increased, and the raw coal is prevented from being blocked at the air outlet of the bronchial pipes 7; on the other hand, the blowing direction of the bronchial pipes 7 is downward, so that the raw coal and the adhered coal powder are pushed downward after blowing, which promotes the falling effect of the raw coal and improves the anti-blocking effect.

[0039] The bronchial pipes 7 can also be selected to be inclined in the same direction, that is, the angle between the axis of the bronchial pipe 7 and the tangent of the connection position with the air supply pipe 6 is less than 90°, further reducing the impact between the raw coal and the bronchial pipe 7, while avoiding blockage of the air outlet end of the bronchial pipe 7 and ensuring the clearing effect.

[0040] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A coal pulverizer anti-blocking coal drop pipe, characterized in that: The invention comprises a coal receiving pipe (1), a transition pipe (2) and a coal dropping main pipe (3) which are connected in sequence from top to bottom, wherein the inner diameter of the top port of the transition pipe (2) is larger than the inner diameter of the bottom port of the transition pipe (2); a purge device (4) is provided on the transition pipe (2), and the output end of the purge device (4) extends to the interior of the transition pipe (2).

2. The anti-blocking coal drop pipe of the coal mill according to claim 1, characterized in that: The top port of the coal receiving pipe (1) is square, the bottom port of the coal receiving pipe (1) is circular, and the side length of the top port of the coal receiving pipe (1) is greater than the inner diameter of the bottom port of the coal receiving pipe (1).

3. The anti-blocking coal drop pipe of the coal mill according to claim 2, characterized in that: The inner diameter of the top port of the transition pipe (2) is 450 mm to 500 mm, and the inner diameter of the bottom port of the transition pipe (2) is 370 mm to 380 mm.

4. The anti-blocking coal drop pipe of the coal mill according to claim 3, characterized in that: The purging device (4) comprises an air inlet pipe (5), an air supply pipe (6) and a plurality of bronchial pipes (7); the air supply pipe (6) is sleeved on the outer side of the transition pipe (2); the outer side of the air supply pipe (6) is connected to the air inlet pipe (5); one end of the bronchial pipe (7) is connected to the inner side of the air supply pipe (6); and the other end of the bronchial pipe (7) passes through the transition pipe (2) and extends to the interior of the transition pipe (2).

5. The anti-blocking coal drop pipe of the coal mill according to claim 4, characterized in that: The plurality of bronchi (7) are arranged at equal intervals around the axis of the transition pipe (2).

6. The anti-blocking coal drop pipe of the coal mill according to claim 5, characterized in that: The number of the bronchi (7) is 4 to 8.

7. The anti-blocking coal drop pipe of a coal mill according to claim 6, characterized in that: The bronchus (7) is arranged to be inclined downward.

8. The anti-blocking coal drop pipe of a coal mill according to claim 6 or 7, characterized in that: The angle between the axis of the bronchus (7) and the tangent of the bronchus (7) at the connection position with the air supply pipe (6) is less than 90°.

9. The anti-blocking coal drop pipe of a coal mill according to claim 8, characterized in that: The coal receiving pipe (1) is an integrated structure.

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