CN220759511U

CN220759511U - Explosion-proof device for coal mill and coal mill

Info

Publication number: CN220759511U
Application number: CN202322397286.9U
Authority: CN
Inventors: 尹立冰; 卢丽芳
Original assignee: Guoneng Hebei Longshan Power Generation Co ltd
Current assignee: Guoneng Hebei Longshan Power Generation Co ltd
Priority date: 2023-09-04
Filing date: 2023-09-04
Publication date: 2024-04-12
Anticipated expiration: 2033-09-04

Abstract

The present disclosure relates to an explosion-proof equipment and coal pulverizer for coal pulverizer, the coal pulverizer includes the coal pulverizer body and connects the air pipe on the coal pulverizer body, and explosion-proof equipment includes: one end of the explosion-proof pipe is in gas communication with the ventilating duct, and the other end of the explosion-proof pipe is formed into an explosion-proof port; the explosion-proof membrane is arranged on the explosion-proof opening; the fixing device is arranged at one end of the explosion-proof pipe, which is close to the explosion-proof opening, and is used for fixing the explosion-proof membrane; and the protective cover is arranged on one side of the explosion-proof membrane, which is far away from the explosion-proof opening, and is spaced from the explosion-proof membrane and used for accommodating fragments generated by the explosion-proof membrane. Use the explosion-proof equipment that this disclosure provided, with explosion-proof pipe and air pipe intercommunication to prolonged the flue gas circulation route, installed the explosion-proof mouth at explosion-proof pipe with the rupture membrane through fixing device, improved rupture membrane mounted position's stability, set up the protection casing simultaneously and prevent rupture membrane piece is scattered, got rid of the potential safety hazard that exists to on-the-spot staff, security when improving the coal pulverizer pressure release.

Description

Explosion-proof device for coal mill and coal mill

Technical Field

The disclosure relates to the technical field of coal mill explosion prevention, in particular to an explosion-proof device for a coal mill and the coal mill.

Background

Coal mills are key equipment for pulverizing power plants, equipment is seriously damaged when deflagration occurs in the coal mills, and huge economic loss is caused, so that the coal mills are generally required to have explosion-proof capability in the working process so as to prevent flammable gas or dust from explosion.

In the related art, a rupture membrane is one of common explosion-proof devices, and in order to secure operation with a coal mill, the rupture membrane is generally mounted on a housing or a closed portion of the coal mill, for example, on a mill air duct for circulating mill air. When the internal pressure of the coal mill exceeds the safety range, the explosion-proof membrane can be automatically exploded or broken to rapidly release the internal pressure of the coal mill, thereby avoiding the explosion of the coal mill or reducing the explosion power of the coal mill. Although the setting of rupture membrane can reduce certain potential safety hazard, can produce certain piece when rupture membrane burst pressure release to lead to other peripheral devices of rupture membrane or operating personnel to still have the risk of being impacted by the piece or injuring by a smash.

Disclosure of Invention

A first object of the present disclosure is to provide an explosion-proof apparatus for a coal mill, which can solve, at least in part, technical problems existing in the related art.

A second object of the present disclosure is to provide a coal pulverizer provided with the explosion-proof apparatus provided by the present disclosure.

In order to achieve the above object, the present disclosure provides an explosion-proof apparatus for a coal mill including a coal mill body and a ventilation duct connected to the coal mill body, the explosion-proof apparatus comprising:

one end of the explosion-proof pipe is in gas communication with the ventilating duct, and the other end of the explosion-proof pipe is formed into an explosion-proof port;

an explosion-proof membrane mounted on the explosion-proof port;

the fixing device is arranged at one end of the explosion-proof pipe, which is close to the explosion-proof opening, and is used for fixing the explosion-proof membrane; and

the protection casing is covered and is established the rupture membrane keep away from the one side of explosion vent, and with the rupture membrane looks interval is used for accomodating the piece that the rupture membrane produced.

Optionally, the rupture disk includes:

the membrane body is constructed into a sheet structure with the outer diameter matched with the inner diameter of the explosion-proof port; and

and a mounting portion extending radially outwardly from a periphery of the membrane body for mating with the securing means.

Optionally, the fixing device includes:

the first flange piece is constructed into a first annular structure which can be fixedly sleeved on the periphery of the explosion-proof opening, and the mounting part is mounted on the end face of the first flange piece;

the second flange is in a second annular structure with the inner diameter not smaller than the outer diameter of the film body, and the end face of the second flange is used for pressing the mounting part on the end face of the first flange; and

and the locking piece is used for detachably connecting the first flange piece with the second flange piece.

Optionally, the locking member includes:

the threaded rod can sequentially pass through the first flange piece, the mounting part and the second flange piece; and

the two nuts are respectively connected with the two ends of the threaded rod in a threaded mode, and the two nuts clamp the first flange piece and the second flange piece from two sides.

Optionally, the explosion-proof device further comprises a rotating hinge with two ends fixedly connected with the protective cover and the second flange piece respectively.

Optionally, a clamping block is arranged on the second flange, a clamping groove corresponding to the clamping block is arranged at a side surface position, close to the second flange, of the protective cover, and the protective cover can be inserted into or extend out of the clamping groove through the clamping block so as to be clamped with or separated from the second flange.

Optionally, the explosion-proof device further comprises:

the first fixing hole is formed on the side wall of the clamping groove;

the second fixing hole is formed on the clamping block, and the second fixing hole is opposite to the first fixing hole when the clamping groove is buckled with the clamping block; and

the bolt is used for penetrating through the first fixing hole and extending into the second fixing hole.

Optionally, a hollowed-out area is formed at the position of the protective cover corresponding to the explosion-proof membrane.

Optionally, the explosion-proof pipe extends along the length direction perpendicular to the pipeline, and the explosion-proof opening is inclined by 35-40 degrees towards the axis direction close to the pipeline.

In a second aspect of the present disclosure, a coal mill is provided, the coal mill comprising a coal mill body and a ventilation duct for gas communication with the coal mill body, the ventilation duct being provided with an explosion protection device, the explosion protection device being in accordance with the above.

Through above-mentioned technical scheme, use the explosion-proof device that this disclosure provided, with explosion-proof pipe and air pipe intercommunication to extension flue gas circulation route installs the rupture disk in the explosion-proof mouth department through fixing device, improves the stability of rupture disk mounted position, sets up the protection casing simultaneously and prevents that rupture disk piece from flying in disorder, has got rid of the potential safety hazard that exists to on-the-spot staff, security when improving the coal pulverizer pressure release.

Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:

FIG. 1 is a schematic view of a partial construction of a coal pulverizer provided in an exemplary embodiment of the present disclosure;

FIG. 2 is a cross-sectional view of an explosion proof device for a coal pulverizer provided in an exemplary embodiment of the present disclosure;

FIG. 3 is an enlarged view of portion A of FIG. 2;

FIG. 4 is a schematic view of the overall structure of an rupture disc provided in an exemplary embodiment of the present disclosure;

fig. 5 is a schematic view of the overall structure of a protective cover provided in an exemplary embodiment of the present disclosure.

Description of the reference numerals

10-explosion-proof pipe; 11-explosion-proof port; 20-an explosion-proof film; 21-a membrane body; 22-mounting part; 22 a-vias; 30-a fixing device; 31-a first flange plate; 31 a-a first connection hole; 32-a second flange plate; 32 a-a second connection hole; 33-locking member; 33 a-a threaded rod; 33 b-nut; 40-protecting cover; 41-hollowed-out parts; 42-reinforcing ribs; 50-a rotating hinge; 61-clamping blocks; 62-clamping grooves; 63-a plug pin; 100-explosion-proof device; 200-coal mill body; 210-ventilation duct.

Detailed Description

Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.

In the present disclosure, unless otherwise indicated, the use of orientation words such as "inner" and "outer" are defined according to the environment of use and generally refer to the inner and outer of the own contours of the relevant parts, whereas for a rupture membrane, "inner" refers to the side thereof adjacent to the detonation tube and "outer" refers to the side thereof remote from the detonation tube and the outer side of the own contours of the other corresponding parts; the terms such as "top" and "bottom" are used based on the definition of the usage habit of the explosion-proof device provided by the present disclosure, specifically, reference may be made to the direction of the plane of the drawing shown in fig. 2, where the side pointed by the Z arrow is the top, and vice versa. The terms such as "first," "second," and the like, as used in this disclosure, are used for distinguishing one element from another and not necessarily for order or importance. Furthermore, the following description, when taken in conjunction with the accompanying drawings, like reference numerals designate the same or similar elements in different drawings.

Referring to fig. 1 and 2, the present disclosure provides an explosion protection apparatus for a coal pulverizer. The coal mill includes a coal mill body 200 and a ventilation duct 210 connected to the coal mill body 200. The explosion proof apparatus 100 may include an explosion proof tube 10, an explosion proof membrane 20, a fixing device 30, and a protection cover 40. One end of the explosion-proof pipe 10 is connected to the ventilation pipe 210, and the other end is formed with an explosion-proof port 11, thereby prolonging the flow path of the smoke and improving the explosion-proof effect. The rupture membrane 20 may be installed on the explosion vent 11, and when the coal mill body 200 has an explosion risk, the rupture membrane 20 may burst to release pressure on the coal mill body 200, thereby reducing the risk of serious damage to equipment caused by explosion occurring inside the coal mill. The fixing device 30 may be disposed at one end of the explosion-proof tube 10 near the explosion-proof opening 11, for fixing the explosion-proof membrane 20 at the explosion-proof opening 11, so that on one hand, the explosion-proof membrane 20 is convenient to be fixed and installed, and on the other hand, the reliability of the installation of the explosion-proof membrane 20 can be ensured. The protection cover 40 may be covered on a side of the rupture disk 20 away from the vent 11 and spaced apart from the rupture disk 20 for receiving fragments generated from the rupture disk 20.

Through above-mentioned technical scheme, use the explosion-proof equipment that this disclosure provided, with explosion-proof pipe 10 and air pipe 210 intercommunication to extension flue gas circulation path installs explosion-proof membrane 20 in explosion-proof mouth 11 department through fixing device 30, improves the stability of explosion-proof membrane 20 mounted position, sets up protection casing 40 simultaneously and prevents explosion-proof membrane 20 piece in disorder and flies, has got rid of the potential safety hazard that exists to on-the-spot staff, improves the security when the coal pulverizer pressure release.

Referring to fig. 2 and 4, the rupture membrane 20 may include a membrane body 21 and a mounting portion 22. Wherein, the membrane body 21 may be constructed in a sheet-like structure having an outer diameter matched with an inner diameter of the explosion-proof port 11, thereby securing an explosion-proof effect of the explosion-proof membrane 20. The mounting portion 22 may extend radially outwardly from the membrane body 21 for cooperation with the fixing device 30, thereby ensuring reliability of the mounting of the rupture membrane 20 without affecting the rupture effect of the rupture membrane 20. According to some embodiments provided by the present disclosure, the membrane body 21 and the mounting portion 22 may be an integrally formed structure, thereby further ensuring the mountable strength and the reliability of the explosion-proof membrane 20. When the fixing device 30 has the first flange piece 31 and the second flange piece 32 described below, the contact area of the rupture disc 20 and the first flange piece 31 can be effectively increased by providing the mounting portion 22, and the reliability of the mounting of the rupture disc 20 can be further ensured.

Referring to fig. 1-3, the fixture 30 may include a first flange piece 31, a second flange piece 32, and a locking member 33. The first flange 31 may be configured as a first ring-shaped structure that can be fixedly installed around the explosion vent 11, and an inner diameter of the ring-shaped structure may be matched with an outer diameter of the explosion vent 11, thereby ensuring connection strength and sealing between the first flange 31 and the explosion-proof pipe 10. The mounting portion 22 may be mounted on an end surface of the first flange 31, for example, may be fixed or set up on a top surface of the first flange 31 by welding, so that the first flange 31 not only can play a role in mounting the rupture disk 20, but also can play a certain supporting role on the rupture disk 20, so as to ensure stability of mounting the rupture disk 20 at the position of the rupture disk 11. The second flange piece 32 may be configured as a second ring-shaped structure having an inner diameter not smaller than the outer diameter of the membrane body 21, and the bottom end surface of the second flange piece 32 may be used to press the mounting portion 22 onto the top of the first flange piece 31, so as to apply a certain pressing force to the mounting portion 22 in the direction of the first flange piece 31, thereby improving the contact area between the explosion-proof membrane 20 and the second flange piece 32 and the first flange piece 31, and further improving the reliability of the mounting of the explosion-proof membrane 20. The locking member 33 may detachably connect the first flange piece 31 with the second flange piece 32 to detach the rupture disc 20 by separating the second flange piece 32 from the first flange piece 31 when the rupture disc 20 has a need for replacement or repair. And when the coal mill and the explosion-proof membrane 20 work normally, the explosion-proof membrane 20 is fixed between the first flange piece 31 and the second flange piece 32, so that the explosion-proof membrane 20 is stably installed at the explosion-proof port 11, and the tightness between the explosion-proof membrane 20 and the explosion-proof port 11 is improved.

Referring to fig. 2 and 3, the locking member 33 may include a threaded rod 33a and two nuts 33b, the threaded rod 33a being capable of passing through the first flange piece 31, the mounting portion 22, and the second flange piece 32 in order. Two nuts 33b may be screwed to both ends of the threaded rod 33a, respectively, and the two nuts 33b clamp the first flange piece 31 and the second flange piece 32 from both sides. According to some embodiments provided by the present disclosure, the first flange piece 31 may be formed thereon with a first connection hole 31a, and the mounting portion 22 may be formed at the corresponding first connection hole 31a with a via hole 22a, and the second flange piece 32 may be formed at the corresponding first connection hole 31a with a second connection hole 32a, such that the threaded rod 33a may sequentially pass the first connection hole 31a, the via hole 22a, and the second connection hole 32a through the first flange piece 31, the mounting portion 22, and the second flange piece 32. Through two nuts 33b and threaded rod 33a threaded connection to when having realized that first flange piece 31 and second flange piece 32 can dismantle the connection, can increase the clamping force that first flange piece 31 and second flange piece 32 applyed rupture disk 20 effectively, thereby improved reliability and the leakproofness of rupture disk 20 installation, and then guaranteed the explosion-proof effect of rupture disk 20.

As shown in fig. 4, according to some embodiments provided by the present disclosure, the number of the through holes 22a may be plural, and the plural through holes 22a may be arranged at intervals along the circumferential direction of the mounting portion 22, and accordingly, at positions corresponding to the plural through holes 22a, the first flange piece 31 may be formed with plural first connection holes 31a, and the second flange piece 32 may be formed with plural second connection holes 32a, so as to satisfy the mounting requirement of the rupture disc 20, and further improve the connection strength between the rupture disc 20 and the fixing device 30.

Referring to fig. 2 and 3, the explosion-proof apparatus 100 further includes a rotation hinge 50 having both ends fixedly connected to the protection cover 40 and the second flange 32, respectively, so that the protection cover 40 can be rotatably connected to the second flange 32, and the protection cover 40 is covered on the outside of the explosion-proof film 20 when the protection cover 40 is rotated in a clockwise direction (right side of the drawing direction shown in fig. 2), and is opened to be away from the explosion-proof film 20 when the protection cover 40 is rotated in a counterclockwise direction (right side of the drawing direction shown in fig. 2). On the other hand, the protection cover 40 is connected with the fixing device 30 through the rotating hinge, so that the protection cover 40 still cannot be completely separated from the second flange piece 32 when being opened, and the loss of the protection cover 40 is avoided.

Referring to fig. 2 and 3, the second flange 32 is provided with a clamping block 61, and the side of the protection cover 40, which is close to the second flange 32, corresponds to a clamping groove 62 provided by the clamping block 61, and the protection cover 40 can be inserted into or extend out of the clamping groove 62 through the clamping block 61 to be clamped with or separated from the second flange 32, that is, when the protection cover 40 rotates in the opening direction, the clamping block 61 and the clamping groove 62 can be automatically separated, and when the protection cover 40 rotates in the closing direction, the clamping block 61 and the clamping groove 62 can be automatically clamped, so that the protection cover 40 can be timely buckled or opened according to the requirement of the explosion-proof film 20, and the connection strength of the protection cover 40 and the second flange 32 when buckled is improved. In the embodiment provided by the present disclosure, the clamping block 61 and the clamping groove 62 may be disposed opposite to the rotation hinge 50 along the radial direction of the explosion vent 11, so that the connection strength of the clamping block 61 and the clamping groove 62 during buckling can be improved. The clamping groove 62 and the clamping block 61 can be buckled when the rupture disk 20 is not broken, so that fragments of the rupture disk 20 are prevented from splashing, and the rupture disk 20 is opened after being broken, so that the rupture disk 20 is cleaned conveniently.

Referring to fig. 3, the explosion-proof apparatus 100 may further include a first fixing hole, a second fixing hole, and a latch 63. The first fixing hole may be formed on a sidewall of the card slot 62 and may be configured as a through hole; the second fixing hole may be formed on the latch 61 and may be configured as a blind hole. Meanwhile, the second fixing hole can be opposite to the first fixing hole when the clamping groove 62 and the clamping block 61 are buckled, so that when the bolt 63 passes through the first fixing hole, the bolt 63 can extend into the second fixing hole to connect the clamping groove 62 and the clamping block 61, so that the connection strength of the protective cover 40 and the second flange piece 32 can be improved when the protective cover 40 and the second flange piece 32 are buckled, and when the protective cover 40 has opening requirements, the protective cover 40 can be timely opened by pulling out the bolt 63 to timely clean fragments of the explosion-proof film 20, and the normal operation of the coal mill can be recovered as soon as possible.

Referring to fig. 2 and 5, a hollowed portion 41 may be formed at a position of the protection cover 40 corresponding to the explosion-proof membrane 20, the hollowed portion 41 may be a mesh structure having a plurality of meshes, and a plurality of reinforcing ribs 42 disposed at intervals may be installed on the mesh structure, so that pressure relief of the explosion-proof membrane 20 is not blocked when sufficient protection strength of the protection cover 40 is ensured. The hollowed-out area (e.g. the aperture of the mesh) of the hollowed-out portion should be designed small enough to be able to intercept most of the fragments without affecting the pressure relief. According to some embodiments provided by the present disclosure, the protection cover 40 may be made of a metal material to ensure that the protection cover 40 has sufficient rigidity and strength so that the protection cover 40 is not damaged when the explosion proof film 20 explodes.

Referring to fig. 1 and 2, the explosion-proof pipe 10 may extend in a length direction perpendicular to the pipe 210 to extend a flow path of the smoke at most, and the explosion-proof pipe 10 may extend outside the working site to the outside atmosphere to integrally set the explosion-proof device in the atmosphere, thereby improving the safety of the coal mill. The explosion vent 11 can be inclined by 35-40 degrees towards the axis direction close to the pipeline 210, so that a worker can observe the action of the explosion-proof membrane 20 conveniently, and take corresponding measures in time.

Referring to fig. 1, according to a second aspect of the present disclosure, there is also provided a coal pulverizer that may include a coal pulverizer body 200 and a ventilation duct 210 for gas communication with the coal pulverizer body 200, the ventilation duct 210 may be provided with an explosion-proof device 100, the explosion-proof device 100 being the explosion-proof device described above. The coal mill has all the beneficial effects of the explosion-proof device provided by the disclosure, and the description is omitted here.

The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.

In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the present disclosure does not further describe various possible combinations.

Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.

Claims

1. An explosion-proof apparatus for a coal pulverizer, the coal pulverizer including a coal pulverizer body and a vent conduit connected to the coal pulverizer body, the explosion-proof apparatus comprising:

an explosion-proof membrane mounted on the explosion-proof port;

2. The explosion-proof device of claim 1, wherein the explosion-proof membrane comprises:

3. The explosion-proof device of claim 2, wherein the securing means comprises:

4. The explosion-proof apparatus of claim 3, wherein the locking member comprises:

5. The explosion-proof apparatus according to claim 3, further comprising a rotary hinge fixedly connected at both ends thereof to the shield and the second flange plate, respectively.

6. The explosion-proof device according to claim 5, wherein a clamping block is arranged on the second flange, a clamping groove corresponding to the clamping block is arranged on the side face, close to the second flange, of the protective cover, and the protective cover is inserted into or stretches out of the clamping groove through the clamping block to be clamped with or separated from the second flange.

7. The explosion proof device of claim 6, further comprising:

the first fixing hole is formed on the side wall of the clamping groove;

8. The explosion-proof device according to claim 1, wherein a hollowed-out portion is formed at a position of the protective cover corresponding to the explosion-proof membrane.

9. The explosion-proof apparatus according to claim 1, wherein the explosion-proof pipe extends in a direction perpendicular to a length direction of the pipe, and the explosion-proof port is inclined by 35 ° to 40 ° toward an axis direction near the pipe.

10. A coal mill characterized in that the coal mill comprises a coal mill body and a ventilation pipe for gas communication with the coal mill body, wherein an explosion-proof device is arranged on the ventilation pipe, and the explosion-proof device is the explosion-proof device according to any one of claims 1-9.