A pulverized coal burner

Abstract

The present invention discloses a pulverized coal burner, comprising a central tube, a swirl air duct, a pulverized coal tube and an axial flow air duct coaxially sleeved together from the inside to the outside, wherein the central tube, the swirl air duct, the pulverized coal tube and the axial flow air duct isolate an oil gun channel, a swirl air duct, a pulverized coal duct and an axial flow air duct from the inside to the outside, and the central tube is spliced ​​together by a head end and a tail end, and the head end is detachably connected to the tail end. When the burner is in use, if the head end is severely damaged and cannot be repaired under high temperature conditions, only the head end needs to be removed and replaced without replacing the entire central tube, thereby reducing the cost of use. When the head end is not severely damaged and can be repaired under high temperature conditions, the head end can be removed and taken to a suitable place for surfacing welding repair, which is not restricted by on-site conditions and is more convenient to operate. Alternatively, the head end can be removed and replaced with a spare head end to resume work first, and the damaged head end can be repaired later in a centralized manner, thereby improving work efficiency.

Description

Technical Field

[0001] The present invention relates to the field of burner equipment, in particular to a pulverized coal burner. Background Art

[0002] Existing pulverized coal burners are all made of metal materials such as carbon steel. When working, the hardness and wear resistance of the burner front end are significantly reduced in a high temperature environment, resulting in the front end of the burner being frequently damaged by the impact of coal powder. In particular, the front end of the center tube, which serves as the ignition point, is damaged very frequently and requires frequent surfacing welding repair or replacement. The center tube is located at the innermost part of the burner, which is extremely inconvenient to operate and requires a lot of time to waste, resulting in low work efficiency and high cost. Summary of the Invention

[0003] The object of the present invention is to provide a pulverized coal burner to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a pulverized coal burner, comprising a central tube, a swirl air duct, a pulverized coal tube and an axial flow air duct coaxially sleeved together from the inside to the outside, wherein the central tube, the swirl air duct, the pulverized coal tube and the axial flow air duct are used to isolate the oil gun channel, the swirl air duct, the pulverized coal duct and the axial flow air duct from the inside to the outside, and the central tube is spliced ​​by a head end and a tail end, and the head end is detachably connected to the tail end.

[0005] Preferably, for the pulverized coal burner, the head end of the center tube is a columnar body, the diameter of the columnar body is the same as the inner diameter of the swirl air duct, and the columnar body is embedded and fixed at the front end inside the swirl air duct so that it can be detachably spliced ​​on the tail end of the center tube, and the columnar body is provided with a first outlet connected to the oil gun channel and a second outlet connected to the swirl air duct.

[0006] Preferably, for the pulverized coal burner, the first outlet is a first channel axially penetrating the center of the columnar body, and the second outlet is a plurality of second channels surrounding the periphery of the first channel.

[0007] Preferably, for the pulverized coal burner, the first outlet is a first channel axially penetrating the center of the columnar body, and the second outlet is a plurality of arc-shaped grooves arranged in parallel and evenly distributed on the side wall of the columnar body.

[0008] Preferably, for the pulverized coal burner, the columnar body is made of metal material, and is further fixed to the front end of the swirl air duct by multi-point spot welding.

[0009] Preferably, for the pulverized coal burner, the columnar body is made of silicon carbide ceramic material and has a mounting hole on it. A welding intermediate body made of metal material is fastened to the columnar body by fitting a fixing bolt with the mounting hole. The welding intermediate body is connected to the central tube or swirl air duct by multi-point spot welding so that the columnar body is further fixed at the front end inside the swirl air duct.

[0010] Preferably, for the pulverized coal burner, the mounting hole is located on the inner end face of the columnar body, and the welding intermediate is a metal ring attached and fixed to the inner end face of the columnar body by the cooperation of the fastening bolts and the mounting hole, and the metal ring is welded to the center tube through multiple Z-shaped brackets.

[0011] Preferably, for the pulverized coal burner, a plurality of recessed receiving grooves are provided on the outer end surface of the columnar body, and black body materials are embedded in the receiving grooves.

[0012] Preferably, for the pulverized coal burner, an outer axial flow air duct is further provided outside the axial flow air duct, and an outer axial flow air duct is provided between the axial flow air duct and the outer axial flow air duct.

[0013] Preferably, for the pulverized coal burner, a plurality of rake nails are provided on the outside of the outer axial flow air duct to facilitate installation and fixation of the pulverized coal burner.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The present invention provides a pulverized coal burner, in which the head end of the central tube is detachably connected to the tail end. When the head end is damaged under high temperature, the head end can be conveniently removed. On the one hand, when the damage is serious and needs to be replaced, only the head end needs to be replaced without replacing the entire inner tube, thereby reducing practical costs. On the other hand, when the damage is not serious and needs to be repaired, the head end can be removed and then welded at a convenient site, which is easy to operate. The head end can also be removed and quickly replaced with a spare head end, and the damaged head end can be repaired later, thereby improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a front end view of the columnar body of the present invention when it is made of metal material;

[0017] Figure 2 It is an axial cross-sectional view of the cylindrical body of the present invention when it is made of metal material;

[0018] Figure 3 This is a front end view of the columnar body of the present invention when it is made of silicon carbide ceramic material;

[0019] Figure 4It is an axial cross-sectional view of the columnar body of the present invention when it is made of silicon carbide ceramic material; DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] See also Figure 1-2 The present invention provides a technical solution: a pulverized coal burner, comprising a central tube 6, a swirl air duct 5, a pulverized coal tube 4 and an axial flow air duct 3 coaxially sleeved together from the inside to the outside, the central tube 6, the swirl air duct 5, the pulverized coal tube 4 and the axial flow air duct 3 are all made of metal materials, preferably carbon steel, and the central tube 6, the swirl air duct 5, the pulverized coal tube 4 and the axial flow air duct 3 are used to isolate the oil gun channel 7, the swirl air duct 8, the pulverized coal air duct 9 and the axial flow air duct 10 from the inside to the outside, the central tube 6 is spliced ​​by a head end and a tail end, and the head end is detachably connected to the tail end.

[0022] In this structure, the head end of the central tube 6 can be easily separated from the tail end. During actual use, when the head end is severely damaged and cannot be repaired under high temperature conditions, it is only necessary to remove the head end and replace it without replacing the entire central tube 6, which reduces the cost of use. When the head end is not seriously damaged and can be repaired under high temperature conditions, the head end can be removed and taken to a suitable place for surfacing repair, which is not restricted by site conditions and is more convenient to operate. The head end can also be removed and replaced with a spare head end to resume work first, and the damaged head end can be repaired later, which improves work efficiency.

[0023] In another embodiment, the head end of the central tube 6 is further formed into a columnar body 16. The diameter of the columnar body 16 is the same as the inner diameter of the swirl duct 5. The columnar body 16 is embedded and fixed at the front end of the swirl duct 5 so as to be detachably connected to the rear end of the central tube 6. The columnar body 16 is provided with a first outlet connected to the oil gun passage 7 and a second outlet connected to the swirl duct 8. In this embodiment, the columnar body 16 serves as the head end and can be directly embedded and fixed at the front end of the swirl duct 5 to achieve the aforementioned detachable connection. The first and second outlets ensure unobstructed flow of the oil gun passage 7 and the swirl duct 8.

[0024] In another embodiment, the first outlet is a first channel axially extending through the center of the columnar body 16, and the second outlet is a plurality of second channels (not shown) surrounding the first channel. This embodiment provides one form of the first and second outlets. In this embodiment, the oil gun channel 7 is identical to conventional burner products, while the front end of the swirl air channel 8 is split into multiple streams of direct air. While the air volume remains unchanged and the volume is reduced, the air pressure increases at the outlet, thereby improving the combustion effect.

[0025] In another embodiment, further, the first outlet is a first channel 12 axially extending through the center of the column 16, and the second outlet is a plurality of arc-shaped grooves 13 arranged in parallel and evenly distributed on the side wall of the column 16. This embodiment provides another form of the first outlet and the second outlet. In this embodiment, the oil gun channel 7 is no different from a conventional burner product, and the swirl air duct 8 is divided into multiple swirl winds at the front end for delivery. The swirl wind allows the coal powder at the burner outlet to be fully mixed and burned, resulting in an excellent combustion effect. In this form of burner, the arc-shaped grooves opened on the side wall of the column 16 are preferred for forming the swirl wind, rather than the arc-shaped channels opened in the middle of the column 16, because the process of opening an arc-shaped channel in the middle of the column 16 is extremely difficult and the process cost is high, while the process of opening an arc-shaped groove 13 on the side wall is simple and the cost is low.

[0026] In another embodiment, the columnar body 16 is further made of a metal material and is further fixed to the front end of the swirl duct 5 by multi-point spot welding. The aforementioned fixing method of directly embedding the columnar body 16 into the front end of the swirl duct 5 is not stable enough, and there is a problem that the head end is easy to fall off under the impact of airflow in actual use. Using a metal material to make the columnar body 16 and further fixing it by multi-point spot welding can ensure that the head end is not easy to fall off and is also easy to disassemble.

[0027] In another embodiment, further, the columnar body 16 is made of silicon carbide ceramic material and has a mounting hole thereon. A welding intermediate body made of a metal material is fastened to the columnar body 16 by fitting a fastening bolt 18 with the mounting hole. The welding intermediate body is connected to the central tube 6 or the swirl air duct 5 by multi-point spot welding, so that the columnar body 16 is further fixed at the front end inside the swirl air duct 5. In actual use, the columnar body 9 of the metal material is still frequently damaged when subjected to high temperature. As a further improvement, this embodiment uses a silicon carbide ceramic material to make the columnar body 16. The silicon carbide ceramic material has excellent high temperature resistance and wear resistance, and is not easily damaged when used at high temperature. It can reduce the frequency of head end replacement, further reduce costs and improve efficiency. However, the columnar body 16 made of silicon carbide ceramic material cannot be directly welded and fixed to the central tube 6 or the swirl air duct 5, and there is a problem of easy falling off. To address this problem, this embodiment also proposes a method for further fixing the columnar body 16 of the silicon carbide ceramic material, that is, first use a tightening bolt 18 to fasten a welding intermediate of a metal material to the mounting hole of the columnar body 16, and then spot weld the welding intermediate to the central tube 6 or the swirl air duct 5, thereby achieving relative fixation between the silicon carbide ceramic columnar body 16 and the central tube 6 or the swirl air duct 5.

[0028] In another embodiment, further, the mounting hole is located on the inner end face of the column 16, and the welding intermediate is a metal ring 19 attached to the inner end face of the column 16 by the cooperation of the fastening bolt 18 and the mounting hole. The metal ring 19 is welded to the central tube 6 through a plurality of Z-shaped brackets 20. This embodiment provides a specific method for fixing the column 16 of silicon carbide ceramic material by welding the intermediate, such as Figure 4 As shown, in this method, the fastening bolt 18 and the metal ring 19 are located on the inner end face of the column 16, reducing the influence of high temperature, making the connection between the metal ring 19 and the column 16 stable and firm, and the fixation is completed by spot welding between the Z-shaped bracket 20 and the central tube 6, which is convenient for disassembly.

[0029] In another embodiment, the outer end surface of the columnar body 16 is further provided with a plurality of recessed receiving grooves 15, and the receiving grooves 15 are embedded with black body material 14. The columnar body 16 made of silicon carbide ceramic material has excellent high temperature and wear resistance, but its thermal conductivity is somewhat lacking. This embodiment provides a further improvement by forming receiving grooves 15 on the columnar body 16 and embedding black body material 14 in the receiving grooves 15. The excellent thermal radiation performance of the black body material 14 is utilized to improve the overall thermal conductivity of the columnar body 16.

[0030] In another embodiment, further, an outer axial flow air duct 2 is provided outside the axial flow air duct 3 , and an outer axial flow air duct 11 is provided between the axial flow air duct 3 and the outer axial flow air duct 2 .

[0031] In another embodiment, further, a plurality of rake nails 1 are provided on the outside of the outer axial flow duct 2 to facilitate installation and fixation of the pulverized coal burner.

[0032] While 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 these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A pulverized coal burner, comprising a central tube (6), a swirl air duct (5), a pulverized coal tube (4) and an axial flow air duct (3) coaxially sleeved together from the inside to the outside, wherein an oil gun channel (7), a swirl air duct (8), a pulverized coal air duct (9) and an axial flow air duct (10) are separated from the inside to the outside by the central tube (6), the swirl air duct (5), the pulverized coal tube (4) and the axial flow air duct (3), and characterized in that: The central tube (6) is formed by splicing a head end and a tail end, and the head end is detachably connected to the tail end; The head end of the central tube (6) is a columnar body (16), the diameter of the columnar body (16) is the same as the inner diameter of the cyclone air duct (5), and the columnar body (16) is embedded and fixed at the front end of the cyclone air duct (5) so as to be detachably spliced ​​to the tail end of the central tube (6). The columnar body (16) is provided with a first outlet connected to the oil gun channel (7) and a second outlet connected to the cyclone air duct (8); The first outlet is a first channel (12) axially extending through the center of the columnar body (16), and the second outlet is a plurality of arc-shaped grooves (13) arranged in parallel and evenly distributed on the side wall of the columnar body (16); The columnar body (16) is made of silicon carbide ceramic material and has a mounting hole thereon. A welding intermediate body made of a metal material is fastened to the columnar body (16) by means of a fastening bolt (18) engaging with the mounting hole. The welding intermediate body is connected to the central tube (6) or the cyclone duct (5) by means of multi-point spot welding, so that the columnar body (16) is further fixed to the front end inside the cyclone duct (5); The mounting hole is located on the inner end surface of the columnar body (16); the welding intermediate body is a metal ring (19) attached and fixed to the inner end surface of the columnar body (16) through the cooperation of a fastening bolt (18) and the mounting hole; the metal ring (19) is welded to the central tube (6) through a plurality of Z-shaped brackets (20); A plurality of recessed accommodating grooves (15) are provided on the outer end surface of the columnar body (16), and black body material (14) is embedded in the accommodating grooves (15).

2. The pulverized coal burner according to claim 1, characterized in that: An external axial flow air duct (2) is further provided outside the axial flow air duct (3), and an external axial flow air duct (1110) is provided between the axial flow air duct (3) and the external axial flow air duct (2).

3. The pulverized coal burner according to claim 2, characterized in that: A plurality of rake nails (1) are provided on the outside of the outer axial flow air duct (1110) to facilitate installation and fixation of the pulverized coal burner.

Images