CN211781197U - Anti-wind coal dropping pipe - Google Patents

Abstract

The utility model relates to a prevent wind coal breakage pipe that falls. The coal dropping pipe comprises a cylindrical coal dropping pipe body, wherein a coal inlet and a coal outlet are formed in two ends of the coal dropping pipe body respectively, a plurality of air inlet pipe groups are arranged on the outer side of the periphery of the coal dropping pipe body and comprise a plurality of air inlet pipes which are distributed at equal intervals along the outer wall of the periphery of the coal dropping pipe body and are positioned on the same plane, the air inlet pipes are perpendicular to the coal dropping pipe body, an arc-shaped part is arranged at the communication position of the inner wall of the coal dropping pipe body and the air inlet pipes, the arc-shaped part is formed on the outer side of the periphery of the contact position of the air inlet pipes and the inner wall of the coal dropping pipe body, a baffle which is arranged between two adjacent air inlet pipe groups in an opposite direction and can swing along the inner wall of the coal dropping pipe body so as to realize the opening and closing of the inner wall of the coal. The utility model has the advantages that: effectively avoids blockage in the coal dropping pipe body, prevents the generation of air return phenomenon and has good safety.

Description

Anti-wind coal dropping pipe

Technical Field

The utility model relates to a coal conveying equipment field, concretely relates to prevent anti-wind coal breakage pipe.

Background

At present, a large-scale coal-fired generating set with single-machine capacity of 300MW or more is largely provided with a double-inlet double-outlet coal mill and a positive-pressure direct-blowing type pulverizing system, raw coal is ground and dried by the coal mill and then is conveyed to a separator for separation by air flow, qualified coal powder is blown into a hearth by air, and the positive-pressure direct-blowing type pulverizing system has the advantages of simple system, fast load response and the like. However, in the actual operation process of the coal-fired power generating set, because the interior of the coal mill generally keeps a positive pressure of several kilopascals, once the raw coal bin and the connected raw coal hopper are empty, a large amount of hot air and coal powder in the coal mill can instantly pass through the coal feeder, the coal dropping pipe and the raw coal bin, the phenomena of coal breaking and air returning occur, the boiler combustion, the steam drum or the separator can be caused by light people, the belt of the coal feeder can be burnt and damaged due to hot air heating and the boiler can extinguish fire for heavy people, the unit is not planned to be shut down, and frequent coal breaking and air returning often occur in rainy seasons or when coal is wet and sticky in the actual operation, so that the stable operation of the generator and the power system and the safe operation of the whole power plant are seriously influenced.

In order to solve the defects of the prior art, people have long searched for and put forward various solutions. For example, the chinese patent document discloses a coal dropping pipe with a back-draft prevention device [ CN201410247412.5], which comprises a coal dropping pipe capable of preventing the back-draft of the coal from breaking in a positive pressure direct-fired pulverizing system, wherein the coal dropping pipe is provided with a baffle group, a weight mechanism and a sealing chamber, the baffle group is composed of at least one baffle, the baffle is hinged on the inner wall of the coal dropping pipe, the sealing chamber is arranged on the outer wall of the coal dropping pipe and is communicated with the inside of the coal dropping pipe through an opening arranged on the pipe wall of the coal dropping pipe, the weight mechanism is arranged in the sealing chamber, a connecting rod of the weight mechanism extends into the coal dropping pipe for supporting the baffle, and the baffle swings on the inner wall of the coal dropping pipe under the supporting action of the connecting rod to realize the opening and closing control of the coal dropping port of the coal dropping pipe.

The problem that an existing coal dropping barrel is prone to wind reversal is solved to a certain extent by the aid of the scheme, but the scheme still has many defects, such as: the coal powder directly contacts with the inner wall of the coal dropping cylinder, so that the coal dropping cylinder is easy to block.

Disclosure of Invention

The utility model aims at the above-mentioned problem, provide a reasonable in design, simple structure just is difficult for preventing coal breakage pipe that blows back of jam.

In order to achieve the above purpose, the utility model adopts the following technical proposal: the utility model provides a prevent anti-blowback coal breakage pipe, including the coal breakage body that is the tube-shape, coal breakage body both ends are equipped with respectively and advance coal mouth and the coal outlet that is subtend setting, and coal breakage body week outside is equipped with a plurality of air inlet pipe groups, the air inlet pipe group includes a plurality of air-supply lines that distribute and lie in the coplanar along coal breakage body circumference outer wall equidistance, and air-supply line and coal breakage body are perpendicular setting, and the air-supply line link up each other with the inner chamber of coal breakage body, coal breakage body circumference inner wall is equipped with the arc portion with air-supply line intercommunication department, and the arc portion is formed in the circumference outside of air-supply line and coal breakage body inner wall contact department, thereby coal breakage body inner wall is located to be equipped with between two adjacent air-supply line groups and is subtend setting and can realize the baffle that coal breakage body inner wall opened and shut along the swing of coal breakage body inner. The automatic opening and closing of the baffle can effectively solve the accident that the belt is burnt out by the hot wind of the furnace through the coal dropping pipe body in the coal feeding process of the coal feeder, and meanwhile, the arrangement of the arc-shaped part can prevent the coal particles from being in direct contact with the inner wall of the coal dropping pipe body in the descending process, so that the blockage in the coal dropping pipe body is avoided.

In the anti-wind coal breakage pipe, one end between the arc parts forms a contraction end, the other end between the arc parts forms a diffusion end, a throat in the cavity of the coal breakage pipe body is formed between the contraction end and the diffusion end together, the radian of the contraction end is smaller than that of the diffusion end, the radian of the contraction end is gradually reduced from the throat to the coal inlet, and the radian of the diffusion end is gradually reduced from the throat to the coal outlet.

In the anti-back-wind coal dropping pipe, an air outlet is arranged at the contact part of the air inlet pipe and the inner cavity of the coal dropping pipe body, an air inlet is arranged at one end of the air inlet pipe, which is far away from the coal dropping pipe body, and the central axes of the air inlet pipes in the same air inlet pipe group are intersected and form an included angle. The air inlet pipes are arranged at equal intervals, so that the circumferential air supply of the coal falling pipe body is uniform.

In the anti-back-wind coal dropping pipe, the air inlet pipe and the coal dropping pipe body are integrally formed and made of wear-resistant metal materials. Therefore, the service life of the coal dropping pipe body can be prolonged, and abrasion caused by long-time use is avoided.

In foretell anti-wind coal breakage pipe, damping pendulous device includes the damping barrel, and the damping barrel is the circumference outer wall that the subtend set up at the coal breakage body respectively, and has the cavity in the damping barrel, and the upper end is equipped with damping spring in the cavity.

In foretell anti-wind coal breakage pipe, baffle one end is passed through rolling bearing and is set up in the inner chamber of coal breakage body, and the other end setting of baffle is in the cavity of damping barrel, and the one end that the baffle is arranged in the cavity of damping barrel leans on the setting with damping spring one end. The arrangement can lead the baffle plate to be automatically opened when coal particles enter the coal dropping pipe body.

In foretell anti-wind coal breakage pipe, when the baffle keeps balanced state, the one end that the damping barrel was kept away from to the baffle supports the setting each other, and when the baffle kept the slope, the one end that the damping barrel was kept away from to the baffle separated each other and formed the coal breakage entry.

In the anti-wind coal breakage pipe, the stop dog used for preventing the baffle from contacting with the inner wall of the coal breakage pipe body is arranged at the lower end of the damping cylinder body and positioned on the inner wall of the coal breakage pipe body, and the stop dog is made of flexible materials. The baffle can be prevented from swinging too much to collide with the inner wall of the coal dropping pipe body by the arrangement of the baffle.

Compared with the prior art, the utility model has the advantages of: simple structure, low cost through setting up arc portion at the coal breakage body inner wall, makes the coal breakage body form two venturi, has effectively avoided the coal grain to produce the contact with the coal breakage barrel inner wall at the decline in-process, has avoided producing in the coal breakage barrel to block up, and simultaneously, the common cooperation of damping pendulous device and baffle has effectively prevented the production of return air phenomenon, and the security is good.

Drawings

FIG. 1 is a cross-sectional view of the baffle of the present invention after it is closed;

fig. 2 is a cross-sectional view of the present invention with the flapper open;

fig. 3 is a plan view of the present invention.

In the figure, a coal dropping pipe body 1, a coal inlet 11, a coal outlet 12, an air inlet pipe group 2, an air inlet pipe 21, an air outlet 22, an air inlet 23, an arc-shaped part 3, a contraction end 31, a diffusion end 32, a throat 33, a baffle plate 4, a rotating bearing 41, a damping swinging device 5, a damping cylinder body 51, a cavity 52, a damping spring 53, a coal dropping inlet 6 and a stop 7.

Detailed Description

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

As shown in figures 1-3, the anti-back wind coal breakage pipe comprises a cylindrical coal breakage pipe body 1, wherein a coal inlet 11 and a coal outlet 12 which are oppositely arranged are respectively arranged at two ends of the coal breakage pipe body 1, a plurality of air inlet pipe groups 2 are arranged at the circumferential outer side of the coal breakage pipe body 1, the air inlet pipe groups 2 comprise a plurality of air inlet pipes 21 which are equidistantly distributed along the circumferential outer wall of the coal breakage pipe body 1 and are positioned on the same plane, the air inlet pipes 21 are vertically arranged with the coal breakage pipe body 1, the air inlet pipes 21 are communicated with the inner cavity of the coal breakage pipe body 1, an arc part 3 is arranged at the communication position of the circumferential inner wall of the coal breakage pipe body 1 and the air inlet pipes 21, the arc part 3 is formed at the circumferential outer side of the contact position of the air inlet pipes 21 and the inner wall of the coal breakage pipe body 1, a baffle 4 which is oppositely arranged and can swing along the inner wall of the coal breakage pipe body 1 is arranged between two adjacent, and one end of the baffle 4 is provided with a damping swinging device 5 positioned on the outer wall of the coal dropping pipe body 1. Set up baffle 4 through the 1 inner wall of coal breakage body and can effectively prevent the return air, the setting of arc portion 3 has prevented that the coal grain from producing the contact with 1 inner wall of coal breakage body moreover, has avoided producing in the coal breakage body 1 and has blockked up.

Wherein, one end between the arc portion 3 forms shrink end 31, and the other end between the arc portion 3 forms diffusion end 32, and forms throat 33 that is located coal breakage body 1 cavity 52 between shrink end 31 and the diffusion end 32 jointly, and the radian of shrink end 31 is less than the radian of diffusion end 32, and shrink end 31 diminishes gradually from throat 33 department towards coal inlet 11 department radian, and diffusion end 32 diminishes gradually from throat 33 department towards coal outlet 12 department radian. This arrangement forms a vacuum region behind the diffusion end 32, which facilitates the adsorption of coal particles when they approach, thereby preventing clogging.

Specifically, an air outlet 22 is arranged at the contact position of the air inlet pipe 21 and the inner cavity of the coal dropping pipe body 1, an air inlet 23 is arranged at one end of the air inlet pipe 21 far away from the coal dropping pipe body 1, and the central axes of the air inlet pipes 21 in the same air inlet pipe group 2 are intersected and form an included angle of 120 degrees.

Further, the air inlet pipe 21 and the coal dropping pipe body 1 are integrally formed, and are made of wear-resistant metal materials.

Obviously, the damping swing device 5 comprises damping cylinders 51, the damping cylinders 51 are respectively arranged on the circumferential outer wall of the coal dropping pipe body 1 in an opposite manner, a cavity 52 is arranged in the damping cylinders 51, and a damping spring 53 is arranged at the upper end in the cavity 52.

As can be seen, one end of the baffle 4 is arranged in the inner cavity of the coal dropping pipe body 1 through the rotating bearing 41, the other end of the baffle 4 is arranged in the cavity 52 of the damping cylinder 51, and one end of the baffle 4 in the cavity 52 of the damping cylinder 51 is abutted against one end of the damping spring 53. The upward force of the end of the baffle 4 in the cavity 52 of the damping cylinder 51 is equal to the downward force of the damping spring, so that the end of the baffle 4 in the inner cavity of the coal dropping pipe body 1 can be kept balanced.

Further, when the baffle 4 is kept in a balanced state, the ends of the baffle 4 away from the damper cylinder 51 are abutted against each other, and when the baffle 4 is kept inclined, the ends of the baffle 4 away from the damper cylinder 51 are spaced from each other and form the coal drop inlet 6.

In detail, the lower end of the damping cylinder 51, which is located on the inner wall of the coal dropping pipe body 1, is provided with a stopper 7 for preventing the baffle 4 from contacting the inner wall of the coal dropping cylinder, and the stopper 7 is made of a flexible material. The stopper 7 is to prevent the baffle 4 from colliding with the inner wall of the coal dropping pipe body 1.

The principle of the embodiment is as follows: when not having the coal cinder in the coal breakage body 1, baffle 4 keep balance makes 1 inner chamber of coal breakage body be in the closure state, when the coal cinder falls into in the coal breakage body 1, baffle 4 is touched to the coal cinder, thereby make baffle 4 unbalance form coal breakage entry 6, the coal cinder passes through behind coal breakage entry 6, baffle 4 resets, seal 1 inner chamber of coal breakage body, prevent the return air, and, through setting up arc portion 3 at 1 inner wall of coal breakage body, the shrinkage end 31 on the arc portion 3 is by the coarse thinning to the air current, in order to accelerate the gas velocity of flow, make gaseous rear side at diffusion end 32 export form a vacuum area, can produce certain adsorption to the coal cinder when this vacuum area is close to the coal cinder, this adsorption concentrates on the middle part to the coal cinder, coal cinder and 1 inner wall direct contact of coal breakage body have been avoided, the jam has been reduced.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Although the terms of the coal dropping pipe body 1, the coal inlet 11, the coal outlet 12, the air inlet pipe group 2, the air inlet pipe 21, the air outlet 22, the air inlet 23, the arc-shaped portion 3, the contraction end 31, the diffusion end 32, the throat 33, the baffle 4, the rotary bearing 41, the damping swing device 5, the damping cylinder 51, the cavity 52, the damping spring 53, the coal dropping inlet 6, the stopper 7, etc. are used more frequently, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed in a manner that is inconsistent with the spirit of the invention.

Claims (8)

1. The utility model provides a prevent anti-blowback coal breakage pipe, is including the coal breakage body (1) that is the tube-shape, coal breakage body (1) both ends be equipped with respectively and advance coal mouth (11) and go out coal mouth (12) that are the subtend setting, and coal breakage body (1) circumference outside is equipped with a plurality of air-intake pipe group (2), air-intake pipe group (2) including a plurality of air-intake pipes (21) that distribute and lie in the coplanar along coal breakage body (1) circumference outer wall equidistance, and air-intake pipe (21) and coal breakage body (1) are perpendicular setting, just air-intake pipe (21) link up each other with the inner chamber of coal breakage body (1) its characterized in that, coal breakage body (1) circumference inner wall be equipped with arc portion (3) with air-intake pipe (21) intercommunication department, and arc portion (3) are formed in the circumference outside of air-intake pipe (21) and coal breakage body (1) inner wall contact department, coal breakage body (1) inner wall be located and be equipped with between two adjacent pipe groups (2) and be the subtend setting Thereby baffle (4) that the inner wall of coal breakage body (1) opened and shut are realized in the swing of coal breakage body (1) inner wall, and baffle (4) one end is equipped with damping pendulous device (5) that are located coal breakage body (1) outer wall.

2. The anti-wind-back coal dropping pipe according to claim 1, characterized in that a contraction end (31) is formed at one end between the arc parts (3), a diffusion end (32) is formed at the other end between the arc parts (3), a throat (33) located in a cavity (52) of the coal dropping pipe body (1) is formed between the contraction end (31) and the diffusion end (32), the radian of the contraction end (31) is smaller than that of the diffusion end (32), the radian of the contraction end (31) is gradually reduced from the throat (33) to the coal inlet (11), and the radian of the diffusion end (32) is gradually reduced from the throat (33) to the coal outlet (12).

3. The anti-downdraft coal dropping pipe according to claim 2, wherein an air outlet (22) is formed at a contact position of the air inlet pipe (21) and an inner cavity of the coal dropping pipe body (1), an air inlet (23) is formed at one end, far away from the coal dropping pipe body (1), of the air inlet pipe (21), and central axes of the air inlet pipes (21) in the same air inlet pipe group (2) are intersected to form an included angle of 120 degrees.

4. An anti-downdraft coal dropping pipe according to claim 2 or 3, wherein the air inlet pipe (21) and the coal dropping pipe body (1) are integrally formed and made of wear-resistant metal materials.

5. The anti-wind-back coal dropping pipe according to claim 1, wherein the damping swinging device (5) comprises damping cylinders (51), the damping cylinders (51) are respectively oppositely arranged on the circumferential outer wall of the coal dropping pipe body (1), a cavity (52) is arranged in each damping cylinder (51), and a damping spring (53) is arranged at the inner upper end of each cavity (52).

6. Anti-wind-return coal dropping pipe according to claim 5, characterized in that one end of the baffle (4) is arranged in the inner cavity of the coal dropping pipe body (1) through the rotating bearing (41), the other end of the baffle (4) is arranged in the cavity (52) of the damping cylinder (51), and one end of the baffle (4) in the cavity (52) of the damping cylinder (51) is abutted against one end of the damping spring (53).

7. Anti-wind-back coal dropping pipe according to claim 6, characterized in that when the baffle (4) keeps the balance state, the ends of the baffle (4) far away from the damping cylinder (51) are arranged against each other, and when the baffle (4) keeps inclining, the ends of the baffle (4) far away from the damping cylinder (51) are mutually separated and form the coal dropping inlet (6).

8. An anti-wind-return coal dropping pipe according to claim 7, characterized in that the lower end of the damping cylinder (51) is provided with a stop (7) for preventing the baffle (4) from contacting the inner wall of the coal dropping pipe body (1), and the stop (7) is made of flexible material.

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