阅读说明：本技术 一种煤粉旋流燃烧器 (Pulverized coal cyclone burner ) 是由 蔡小峰 陈梅芳 于 2020-05-27 设计创作，主要内容包括：本发明公开了一种煤粉旋流燃烧器,包括：沿径向从内向外依次布置的一次风通道、内二次风通道和外二次风通道,一次风通道的出风口设置有喷嘴,还包括调风器。调风器包括外二次风套筒挡板和外二次风套筒挡板调节部、外二次风旋流叶片和外二次风旋流叶片调节部；外二次风套筒挡板调节部可驱动外二次风套筒挡板移动以调节外二次风通道的进风口的开度。外二次风旋流叶片调节部可驱动外二次风旋流叶片移动。本申请的煤粉旋流燃烧器无中心风设计,在燃烧器喷口形成更大的还原性区域,进入炉膛的煤粉能够快速着火和快速升温,在有限的时间内,可释放出煤种中更多CH基团,用以来还原燃烧器主燃区所生成的NOx,实现火焰内还原降低NOx。(The invention discloses a pulverized coal cyclone burner, which comprises: the air conditioner comprises a primary air channel, an inner secondary air channel and an outer secondary air channel which are sequentially arranged from inside to outside along the radial direction, wherein an air outlet of the primary air channel is provided with a nozzle, and the air conditioner also comprises an air regulator. The air regulator comprises an outer secondary air sleeve baffle, an outer secondary air sleeve baffle adjusting part, an outer secondary air swirl blade and an outer secondary air swirl blade adjusting part; the outer secondary air sleeve baffle adjusting part can drive the outer secondary air sleeve baffle to move so as to adjust the opening degree of an air inlet of the outer secondary air channel. The outer secondary air swirling flow blade adjusting part can drive the outer secondary air swirling flow blades to move. The pulverized coal cyclone burner has the advantages that the design of no central air is adopted, a larger reducing area is formed at the nozzle of the burner, pulverized coal entering a hearth can quickly catch fire and quickly rise in temperature, more CH groups in coal can be released in limited time, NOx generated in a main combustion area of the burner is reduced, and reduction in flame is realized.)

1. A pulverized coal cyclone burner comprising: the pulverized coal burner is characterized by also comprising a primary air channel (10), an inner secondary air channel (30) and an outer secondary air channel (20) which are sequentially arranged from inside to outside along the radial direction, wherein an air outlet of the primary air channel (10) is provided with a nozzle (40), and the pulverized coal burner is a flow equalizing burner and also comprises an air regulator (50) for controlling and regulating secondary air;

the air regulator (50) comprises an outer secondary air sleeve baffle (51), an outer secondary air sleeve baffle adjusting part (57), an outer secondary air swirl blade (53) and an outer secondary air swirl blade adjusting part (58);

the outer secondary air sleeve baffle (51) is sleeved at an air inlet of the outer secondary air channel (20), and the outer secondary air sleeve baffle adjusting part (57) can drive the outer secondary air sleeve baffle (51) to move in a preset range in the axial direction so as to adjust the opening degree of the air inlet of the outer secondary air channel (20);

the outer secondary wind swirl blades (53) are circumferentially arranged in the outer secondary wind channel (20), and the outer secondary wind swirl blade adjusting portion (58) can drive the outer secondary wind swirl blades (53) to move in the axial direction to adjust the position of the outer secondary wind swirl blades (53) in the outer secondary wind channel (20).

2. The pulverized coal cyclone burner according to claim 1, wherein the air regulator (50) further comprises an inner secondary air sleeve baffle (54) and an inner secondary air sleeve baffle adjusting part (59) which are sleeved at the air inlet of the inner secondary air channel (30); the inner secondary air sleeve baffle adjusting part (59) can drive the inner secondary air sleeve baffle (54) to move in the axial direction so as to adjust the opening degree of an air inlet of the inner secondary air channel (30).

3. The pulverized coal cyclone burner as claimed in claim 2, characterized in that a plurality of inner cyclone vanes (56) circumferentially distributed around the inner secondary air passage (30) are arranged in the inner secondary air passage (30).

4. The pulverized coal cyclone burner of claim 1, characterized in that an outer secondary air flow equalizing cylinder (52) is installed at an air inlet of the outer secondary air channel (20), the outer secondary air flow equalizing cylinder (52) is communicated with the outer secondary air channel (20) and is densely distributed with flow equalizing holes on the surface, and air outside the burner enters the outer secondary air channel (20) from the outer secondary air flow equalizing cylinder (52) in the circumferential direction;

interior overgrate air flow equalizing barrel (55) are installed to the air intake of interior overgrate air passageway (30), interior overgrate air flow equalizing barrel (55) with interior overgrate air passageway (30) intercommunication and the surperficial dense flowing hole that has, the outer overgrate air of part in outer overgrate air duct (20) passes through interior overgrate air flow equalizing barrel (55) circumference gets into interior overgrate air duct (30).

5. The pulverized coal cyclone burner as claimed in claim 1, wherein the outer overgrate air sleeve baffle adjusting part (57) comprises a pulley guide rail (571) arranged along the axial direction of the burner, a pulley device (572) assembled in the pulley guide rail (571), and an outer overgrate air sleeve baffle pull rod (573) connected with the pulley device (572), the outer overgrate air sleeve baffle (51) is connected with the pulley device (572), and the outer overgrate air sleeve baffle pull rod (573) can push the pulley device (572) to slide in the pulley guide rail (571) so as to adjust the position of the outer overgrate air sleeve baffle (51).

6. The pulverized coal cyclone burner as claimed in claim 1, characterized in that the nozzle (40) comprises a plurality of inward-contracting parts (41) and outward-expanding parts (42) which are alternately arranged along the circumferential direction, the inward-contracting parts (41) and the outward-expanding parts (42) extend along the flow direction of the primary air, the inward-contracting parts (41) contract along the radial direction of the nozzle (40), and the outward-expanding parts (42) expand along the radial direction of the nozzle (40).

7. The pulverized coal cyclone burner as claimed in claim 6, wherein the inward-contracting part (41) of the nozzle (40) extends from the nozzle opening of the nozzle (40) to the inside of the primary air channel (10) along the direction opposite to the primary air flow, and the extension length L of the inward-contracting part (41) is 0.5-1.5 of the diameter D of the primary air channel (10).

8. Pulverized coal cyclone burner according to claim 7, characterized in that the flow area at the outlet of the nozzle (40) is the same as the flow area of the primary air channel (10).

9. Pulverized coal cyclone burner according to claim 8, characterized in that the flaring (42) is provided at the outlet of the nozzle (40) with combustion stabilizing teeth (43) extending outwards in the radial direction of the nozzle (40).

10. The pulverized coal cyclone burner as claimed in claim 1, characterized in that the air inlet of the first air channel (10) is connected with a burner elbow (60) and the air is fed through the burner elbow (60), and a pulverized coal flow equalizing plate (61) is arranged in the burner elbow (60).

Technical Field

The invention relates to the technical field of pulverized coal combustion, in particular to a pulverized coal cyclone burner.

Background

The cyclone burner is a device for burning pulverized coal which is widely applied to the current utility boiler and industrial boiler. With the continuous improvement of the environmental protection requirement and the development of ultra-low emission modification in recent years, the application of the low-nitrogen burner is the most economic nitrogen oxide emission reduction means and is the inevitable choice for denitration, but because of the excessive air staged combustion of the existing burner and the excessive pursuit of lower furnace outlet NOx emission, a series of problems are brought to the operation of the boiler.

The central wind barrel of the existing burner on the market is arranged in primary pulverized coal airflow, so that the central wind barrel is easy to wear and frequently replaced, the running and maintenance cost is increased, and the running reliability of a system is reduced. The consumption of the over-fire air adopted by a combustion system matched with the burner is large, the proportion of the over-fire air in the total air supply is usually more than 25%, excessive oxygen-deficient combustion in a hearth region is easily caused, high-temperature corrosion is easily caused, the combustion is delayed, the amount of the desuperheated water of a boiler is increased or even fully opened, and the economical efficiency of the boiler is deteriorated; a small amount of cooling air needs to be introduced into the central air when the boiler operates, and the existence of the part of air is easy to form an oxidizing atmosphere in a nozzle area of the combustor, so that the reduction of NOx in the combustion process is reduced; the combustor utilizes the mode of flaring to delay the mixture of primary air/secondary air, controls the formation of NOx in the burning through the mode of delaying burning, and the ability that reduces NOx is weak, and the flue gas that the seat was rolled up to too big flaring opening angle is easy to burn spout and flaring.

In addition, with the increasingly wide coal sources of power plants, the coal quality is more unstable, and the coal-fired units participate in deep peak shaving more frequently, so that new adjustment is provided for the operation of a burner system, and the comprehensive level of the conventional double-air-regulation cyclone pulverized coal burner needs to be further improved.

Disclosure of Invention

In order to solve the technical problem, the invention provides a pulverized coal cyclone burner.

According to an aspect of the present application, there is provided a pulverized coal cyclone burner, including: the pulverized coal cyclone burner is a flow equalizing burner and also comprises an air regulator for controlling and regulating secondary air; the air regulator comprises an outer secondary air sleeve baffle, an outer secondary air sleeve baffle adjusting part, an outer secondary air swirl blade and an outer secondary air swirl blade adjusting part; the outer secondary air sleeve baffle is sleeved at the air inlet of the outer secondary air channel, and the outer secondary air sleeve baffle adjusting part can drive the outer secondary air sleeve baffle to move in a preset range in the axial direction so as to adjust the opening of the air inlet of the outer secondary air channel; the outer secondary air swirl blade is annularly arranged in the outer secondary air channel, and the outer secondary air swirl blade adjusting part can drive the outer secondary air swirl blade to move in the axial direction so as to adjust the position of the outer secondary air swirl blade in the outer secondary air channel.

Optionally, the air regulator further comprises an inner secondary air sleeve baffle plate and an inner secondary air sleeve baffle plate adjusting part, wherein the inner secondary air sleeve baffle plate and the inner secondary air sleeve baffle plate adjusting part are sleeved at the air inlet of the inner secondary air channel; the inner secondary air sleeve baffle adjusting part can drive the inner secondary air sleeve baffle to move in the axial direction so as to adjust the opening degree of an air inlet of the inner secondary air channel.

Optionally, a plurality of inner swirl vanes circumferentially distributed in the inner secondary air channel are arranged in the inner secondary air channel.

Optionally, an outer secondary air flow equalizing cylinder is mounted at an air inlet of the outer secondary air channel, the outer secondary air flow equalizing cylinder is communicated with the outer secondary air channel, flow equalizing holes are densely distributed in the surface of the outer secondary air flow equalizing cylinder, and air outside the combustor enters the outer secondary air channel from the circumferential direction of the outer secondary air flow equalizing cylinder; an inner secondary air flow equalizing cylinder is installed at an air inlet of the inner secondary air channel, the inner secondary air flow equalizing cylinder is communicated with the inner secondary air channel, flow equalizing holes are densely distributed in the surface of the inner secondary air flow equalizing cylinder, and partial outer secondary air in the outer secondary air channel enters the inner secondary air channel through the circumferential direction of the inner secondary air flow equalizing cylinder.

Optionally, the outer secondary air sleeve baffle adjusting part comprises a roller-skating guide rail arranged along the axial direction of the combustor, a roller-skating device assembled in the roller-skating guide rail and an outer secondary air sleeve baffle pull rod connected with the roller-skating device, the outer secondary air sleeve baffle is connected with the roller-skating device, and the outer secondary air sleeve baffle pull rod can push the roller-skating device to slide in the roller-skating guide rail so as to adjust the position of the outer secondary air sleeve baffle.

Optionally, the nozzle includes a plurality of inwardly contracting portions and outwardly expanding portions alternately arranged along the circumferential direction, the inwardly contracting portions and the outwardly expanding portions extend along the flow direction of the primary air, and the inwardly contracting portions contract along the radial direction of the nozzle, and the outwardly expanding portions expand along the radial direction of the nozzle.

Optionally, the inward-contracting part of the nozzle extends into the primary air channel from the nozzle of the nozzle along the direction opposite to the primary air circulation, and the extension length L of the inward-contracting part is 0.5-1.5 of the diameter D of the primary air channel.

Alternatively, the flow area at the outlet of the nozzle is the same as the flow area of the primary air passage.

Optionally, the flaring portion is provided at the outlet of the nozzle with combustion stabilizing teeth extending outwardly in the radial direction of the nozzle.

Optionally, the air inlet of the first air channel is connected with the burner elbow to supply air through the burner elbow, and a pulverized coal flow equalizing plate is arranged in the burner elbow.

The pulverized coal cyclone burner has the advantages that the design of no central air is adopted, a larger reducing area is formed at the nozzle of the burner, pulverized coal entering a hearth can quickly catch fire and quickly rise in temperature, more CH groups in coal can be released in limited time, NOx generated in a main combustion area of the burner is reduced, and reduction in flame is realized.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic structural view of a pulverized coal cyclone burner of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. It should be noted that, in the embodiments and examples of the present application, the feature vectors may be arbitrarily combined with each other without conflict.

The general disadvantages of the existing burner structure design are as follows: the central wind barrel is arranged in primary pulverized coal airflow, is easy to wear and frequently replaced, increases the operation and maintenance cost, and reduces the operation reliability of the system. The central air needs to be introduced with a small amount of cooling air when the boiler operates, and the existence of the central air is easy to form an oxidizing atmosphere in a nozzle area of the combustor, so that the reduction of NOx in the combustion process is reduced. The stable combustion teeth are arranged on the inner wall of the primary air nozzle, the formed central backfire burner nozzle is easy to burn, and the problem of nozzle burning loss generally exists in the existing boiler operation burner. The combustor utilizes the mode of flaring to delay the mixing of primary air/secondary air, controls the formation of NOx in the burning through the mode of delaying burning, and the ability that reduces NOx is weak, and the flue gas that too big flaring opening angle coiled the seat easily burns spout and flaring. The overfire air quantity that the combustion system who matches with the combustor adopted is big, the overfire air accounts for more than 25% at total supply air volume usually, easily cause the regional excessive oxygen deficiency burning of furnace, easily cause high temperature corrosion, the burning is postponed, the boiler desuperheating water yield rises and is full even, boiler economy variation, the total overgrate air adjusting sleeve of combustor arranges in the environment that the boiler bellows is grey, the adjusting device of hoop hinge structure often takes place the bite and makes the structure that combustor unadjustable combustor whirl intensity blade passes through hoop hinge structure angle of adjustment, because of arranging in the environment that the boiler bellows is grey and easily take place the bite and make the combustor unadjustable.

To this end the present application provides a pulverized coal cyclone burner comprising: the combustor comprises a primary air channel 10, an inner secondary air channel 30 and an outer secondary air channel 20 which are sequentially arranged from inside to outside along the radial direction, wherein an air outlet of the primary air channel 10 is provided with a nozzle 40, and the combustor further comprises an air regulator 50 for controlling and regulating secondary air. The pulverized coal cyclone burner has the advantages that the design of no central air is adopted, a larger reducing area is formed at the nozzle of the burner, the pulverized coal entering the hearth is quickly ignited and quickly heated, more CH groups in coal can be released in limited time, the generated NOx in the main combustion area of the burner is reduced, and the reduction in flame is realized.

As shown in fig. 1, the pulverized coal cyclone burner of the present application includes: the pulverized coal burner comprises a primary air channel 10, an inner secondary air channel 20 and an outer secondary air channel 30 which are sequentially arranged from inside to outside along the radial direction, wherein an air outlet of the primary air channel 10 is provided with a nozzle 40, the pulverized coal cyclone burner is a flow equalizing burner, and the burner further comprises an air regulator 50 for controlling and regulating secondary air. The air register 50 includes an outer secondary air sleeve baffle 51, an outer secondary air sleeve baffle adjusting part 57, an outer secondary air swirl vane 53 and an outer secondary air swirl vane adjusting part 58. Compare conventional combustor and come the design of control total intake and whirl intensity through adjustment vane angle, this application has realized the total amount of wind of overgrate air and outer overgrate air whirl intensity independent control.

The outer secondary air sleeve baffle 51 is sleeved at the air inlet of the outer secondary air channel 20, and the outer secondary air sleeve baffle adjusting part 57 can drive the outer secondary air sleeve baffle 51 to move within a predetermined range of the axial direction so as to adjust the opening degree of the air inlet of the outer secondary air channel 20 and further control the total secondary air quantity entering the combustor.

The outer secondary wind swirl blades 53 are circumferentially provided in the outer secondary wind passage 20, and the outer secondary wind swirl blade regulating portion 58 can drive the outer secondary wind swirl blades 53 to regulate the position of the outer secondary wind swirl blades 53 in the axial direction to regulate the amount of outer secondary wind swirl-enhanced by the outer secondary wind swirl blades 53. The outer secondary air swirl blade adjusting portion 58 moves the outer swirl blades 53 to the inner portion of the outer secondary air channel 20, all outer secondary air entering from the air inlet of the outer secondary air channel 20 is swirl-enhanced through the outer secondary air swirl blades 53, the outer secondary air swirl blade adjusting portion 58 moves the outer swirl blades 53 to the air inlet of the outer secondary air channel 20, the outer secondary air entering from the air inlet of the outer secondary air channel 20 cannot completely pass through the outer secondary air swirl blades 53, and the effect of adjusting the swirl strength of the outer secondary air is achieved.

As an example, a plurality of outer swirl blades 53 circumferentially distributed around the outer secondary air channel 20 are arranged in the outer secondary air channel 20, the plurality of outer swirl blades 53 are arranged on a blade base circumferentially arranged around the outer secondary air channel 20 and are connected with the blade base into a whole, and the outer secondary air swirl blade adjusting part 58 is connected with the blade base and drives the blade base to integrally drive the outer swirl blades 53 to move in the outer secondary air channel 20.

As an example, the damper 50 further includes an inner overgrate air sleeve damper 54 and an inner overgrate air sleeve damper adjusting portion 59, which are sleeved at the air inlet of the inner overgrate air passage 30; the inner overgrate air sleeve damper adjustment portion 59 may drive the inner overgrate air sleeve damper 54 to move in the axial direction to adjust the opening of the air inlet of the inner overgrate air duct 30 to control the amount of inner overgrate air entering the inner overgrate air duct 30.

As an example, the inner overfire air duct 30 has disposed therein a plurality of inner swirl vanes 56 circumferentially distributed about the inner overfire air duct 30.

Based on the above example, in one possible implementation, the position of the inner swirl vanes 56 in the inner overfire air duct 30 is fixed, and the inner overfire air entering the inner overfire air duct 30 is all swirl-enhanced by the inner swirl vanes 56.

As an example, as shown in fig. 1, the outer overgrate air sleeve damper adjustment part 57 includes a pulley guide 571 arranged along the axial direction of the combustor, a pulley device 572 assembled in the pulley guide 571, and an outer overgrate air sleeve damper pull rod 573, the outer overgrate air sleeve damper 51 is connected to the pulley device 572, and the outer overgrate air sleeve damper pull rod is connected to the pulley device 572 to push the pulley device to slide in the pulley guide 571 so as to move the position of the outer overgrate air sleeve damper 51.

The roller guide rails 571 can be set to be single-rail rails or double-rail rails according to the needs of the device, the roller guide rails 571 are arranged at the tops of the outer secondary air ducts 20 along the axial direction, the outer secondary air sleeve baffles 51 can slidably adjust the opening degree of the air inlets of the outer secondary air ducts 20 along the roller guide rails 571, the method for adjusting the total secondary air volume entering the outer secondary air ducts 20 is more suitable for the multi-ash air duct operation environment of the boiler, the adjusting method is flexible and not prone to jamming, and long-time flexible adjustment can be guaranteed.

Based on the above example, in a possible implementation mode, the burner of the present application is disposed on the burner bracket, and the pulley rail 571 is connected with the burner bracket and suspended above the outer secondary air duct 20 of the burner.

Based on the above example, both the outer secondary wind swirl vane adjustment portion 58 and the inner secondary wind sleeve baffle adjustment portion 59 may be designed as push rods.

Wherein, the air inlet of the outer overgrate air channel 20 is provided with an outer overgrate air flow equalizing cylinder 52, the outer overgrate air flow equalizing cylinder 52 is communicated with the outer overgrate air channel 20 and is densely provided with flow equalizing holes on the surface, overgrate air enters the outer overgrate air channel 20 along the circumferential direction of the outer overgrate air flow equalizing cylinder 52 to uniformly supply air into the outer overgrate air channel 20, the outer overgrate air at the air outlet of the outer overgrate air channel 20 and pulverized coal in primary air sprayed out of the primary air channel 10 are uniformly combusted, and the condition that flame of a burner is burnt off can be effectively avoided.

Furthermore, an inner secondary air flow equalizing sleeve 55 is installed at an air inlet of the inner secondary air channel 30, the inner secondary air flow equalizing sleeve 55 is communicated with the inner secondary air channel 30, flow equalizing holes are densely distributed in the surface of the inner secondary air flow equalizing sleeve 55, part of outer secondary air enters the inner secondary air channel 30 through the circumferential direction of the inner secondary air flow equalizing sleeve 55 and uniformly enters the inner secondary air channel 30 in the circumferential direction of the inner secondary air channel 30, pulverized coal in primary air sprayed from an air outlet of the inner secondary air channel 30 and pulverized coal in primary air sprayed from the primary air channel 10 are uniformly combusted, and the condition that flame of a burner is burnt partially can be effectively avoided.

As an example, the nozzle 40 of the pulverized coal cyclone burner of the present application comprises a plurality of inward contracting portions 41 and outward expanding portions 42 alternately arranged along the circumferential direction, the inward contracting portions 41 and the outward expanding portions 42 extend along the flow direction of the primary air, and the inward contracting portions 41 contract along the radial direction of the nozzle 40, and the outward expanding portions 42 expand along the radial direction of the nozzle 40. Under the condition, the outward-expanding part 42 and the two adjacent inward-contracting parts 41 form a cutting channel, primary air in the primary air channel 10 enters the nozzle 40 and then is cut into a plurality of coal dust airflows through the cutting channel, the contact area of the coal dust airflows and high-temperature smoke of a hearth is enlarged, the temperature rise rate and the temperature of the coal dust airflows are rapidly improved, the ignition efficiency of the coal dust airflows is enhanced, the early large-scale separation of volatile components in coal dust is facilitated, meanwhile, the gas burner has no central air channel, and a plurality of coal dust airflows can form a larger reducing area in a nozzle area of the burner, so that the formation of early NOx of the burner is controlled.

Based on the above example, in a possible embodiment, the nozzle 40 includes 4 to 8 inward contracting portions 41 and outward expanding portions 42, and the inward contracting portions 41 and the outward expanding portions 42 of the nozzle 40 have the same size. And after the primary air pulverized coal airflow of the primary air channel enters the nozzle, the primary air pulverized coal airflow is divided into 4-8 strands of pulverized coal airflow.

Based on the above example, in a possible embodiment, the inward-contracting portion 41 of the nozzle 40 extends from the nozzle opening of the nozzle 40 to the inside of the primary air channel 10 along the direction opposite to the primary air flow, and the extending length L of the inward-contracting portion 41 is 0.5-1.5 of the diameter D of the primary air channel 10. Under this condition, the extension length of the inward contracting portion 41 is sufficient to cut the primary air entering the nozzle 40 into several streams, and the primary air from the nozzle opening of the nozzle 40 is uniformly combusted with the inner secondary air and the outer secondary air at the nozzle opening to form a larger reducing region.

Based on the above example, in a possible embodiment, the flow area at the outlet of the nozzle 40 is the same as the flow area of the primary air channel 10, and the primary air enters the nozzle 40 with sufficient flow space to help heat the pulverized coal and enhance combustion.

Based on the above example, in one possible embodiment, the flaring 42 is provided with a flame stabilizing tooth 43 on the outlet of the nozzle, extending outwards in the radial direction of the nozzle 40. The secondary air sprayed from the inner secondary air channel 30 and the outer secondary air channel 20 flows to the combustion stabilizing teeth 43 and flows back to the two sides of the combustion stabilizing teeth 43, which is beneficial to heating coal powder and strengthening combustion. The combustor surely fires tooth 43 of this application outwards extends along the radial direction of nozzle, sets up surely with traditional combustor in the nozzle inboard and fires tooth structure and compare, is difficult for burning loss spout, and nozzle life is longer.

As an example, the air inlet of the first air channel 10 is connected with the burner elbow to supply air through the burner elbow 60, and the burner elbow 60 is provided with a pulverized coal flow equalizing plate 61. The concentration of the coal powder in the primary air entering the first air channel 10 is uniform, the coal powder in the primary air sprayed out from the primary air channel 10 can be uniformly combusted, the coal powder aggregation caused by different weights of the coal powder in the primary air is avoided, the burnout effect caused by the over-concentrated concentration of the local coal powder in the first air channel 10 is poor, and the problem of over-high NOx production caused by the over-dilute and over-enriched oxygen of the coal powder concentration is solved.

Based on the above examples, in a possible embodiment, the burner elbow 60 is a right-angle elbow, the burner elbow 60 includes a wind-powder airflow inlet, a wind-powder airflow outlet, and a pulverized coal flow equalizing plate 61 disposed in the burner elbow 60, the pulverized coal flow equalizing plate 61 includes a first flow equalizing plate disposed on a horizontal section of the elbow and a second flow equalizing plate disposed on a vertical section of the elbow in an inclined manner, the first flow equalizing plate is horizontally disposed on a center line of the horizontal section of the elbow, an included angle between the second flow equalizing plate and the first flow equalizing plate is 120-150 °, the pulverized coal airflow entering from the wind-powder airflow inlet of the burner elbow passes through the pulverized coal flow equalizing plate 61, and the pulverized coal flow equalizing plate 61 blocks the pulverized coal in the pulverized coal airflow from being gathered upwards under the action of centrifugal force so as to make the pulverized coal in the primary wind entering the first wind channel 10 uniform in concentration.

In the application process, the structure of the burner elbow 60 is not limited to the structure shown in the embodiment, and any burner elbow structure capable of separating the coal dust into different colors may be selected according to the coal dust category.

As an example, the cyclone burner of the present application is further provided with an outer secondary air expanding cone 42 at the air outlet of the outer secondary air passage 20.

It is to be noted that, in this document, the terms "comprises", "comprising" or any other variation thereof are intended to cover a non-exclusive inclusion, so that an article or apparatus including a series of elements includes not only those elements but also other elements not explicitly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of additional like elements in the article or device comprising the element.

The above embodiments are merely to illustrate the technical solutions of the present invention and not to limit the present invention, and the present invention has been described in detail with reference to the preferred embodiments. It will be understood by those skilled in the art that various modifications and equivalent arrangements may be made without departing from the spirit and scope of the present invention and it should be understood that the present invention is to be covered by the appended claims.