Oil-saving ignition pulverized coal burner with double high-concentration areas

Abstract

The invention relates to the technical field of pulverized coal fired boiler combustors, and particularly discloses a double-high-concentration-area oil-saving ignition pulverized coal combustor. The double-high-concentration-area oil-saving ignition pulverized coal burner comprises a flow guide device and an ignition device arranged in a combustion cylinder. The flow guide device comprises a main cylinder and a turbulent flow structure arranged on the periphery of the main cylinder, the main cylinder is connected to the inner wall of the combustion cylinder through a supporting piece, and the turbulent flow structure is of a structure protruding in the radial direction and used for disturbing the flow direction of mixed gas. Therefore, the problem that in the prior art, when the structural design of an oil-saving ignition pulverized coal burner is in a non-ignition working condition, the pulverized coal concentration distribution mode of'thick inside and thin outside 'is opposite to the design of'thick outside and thin inside' of an original burner of a boiler, and the air powder flow field characteristics of an outlet of the burner and the interior of a hearth are prone to being remarkably influenced is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of pulverized coal boiler burners, and particularly to a fuel-saving ignition pulverized coal burner with double high-concentration zones. Background Art

[0002] In order to save a large amount of fuel consumed during the startup process and stable combustion process of large power station boilers, one or more layers of burners with fuel-saving ignition functions are usually configured in the boiler. Fuel-saving ignition heat sources (such as micro-oil guns, plasma generators, etc.) are used to directly ignite pulverized coal to realize the boiler startup process, and are used for the stable combustion of the boiler during the shutdown process, low load and ultra-low load conditions. Since the ignition heat sources (micro-oil guns, plasma generators, etc.) used in fuel-saving ignition burners are smaller in size than conventional oil guns, and the ignition position and energy are more precise, in order to realize the direct ignition function of pulverized coal, a special burner structure design is required to complete the ignition process inside the pulverized coal burner. Pulverized coal burners of the front and rear wall opposed firing furnace type usually adopt the method of segmented ignition and step-by-step amplification. First, part of the high-concentration pulverized coal near the ignition source outlet is ignited, and then the ignited pulverized coal is used to continue to ignite the pulverized coal in other parts, and finally the ignition process of all the pulverized coal passing through the burner is realized, so as to achieve the purpose of starting the boiler with coal instead of oil.

[0003] Traditional pulverized coal burners usually adopt the method of fuel ignition during the startup process. This method not only has high costs, but also causes greater pollution to the environment, which does not conform to the development trend of energy conservation and emission reduction. With the development of technology, fuel-saving ignition pulverized coal burners have emerged. Currently, the common structure of fuel-saving ignition pulverized coal burners adopts the method of central concentration ignition and step-by-step amplification.

[0004] Specifically, in order to meet the requirement of installing an ignition source at the axial center position of the opposed firing furnace type, the pulverized coal concentration distribution in the burner shows the characteristic of "thick in the inner and thin in the outer". Through special structural design, pulverized coal burners of the front and rear wall opposed firing furnace type use the method of segmented ignition and step-by-step amplification. First, the high-concentration pulverized coal near the ignition source outlet is ignited, and then the ignited pulverized coal is used to ignite the pulverized coal in other parts, and finally the ignition of all the pulverized coal is realized, achieving the goal of starting the boiler with coal instead of oil. However, in the non-ignition condition, the "thick in the inner and thin in the outer" pulverized coal concentration distribution mode of this common fuel-saving ignition pulverized coal burner structure is opposite to the "thick in the outer and thin in the inner" design of the original boiler burner, which is likely to have a significant impact on the characteristics of the air-powder flow field at the burner outlet and inside the furnace, and further affects the stability and economy of boiler combustion.

[0005] Based on the above technical defects, it is still necessary to optimize and improve the structure of the pulverized coal burner in the existing technology, so that it can better adapt to the working conditions of the original boiler burner, thereby reducing the impact on the air-powder flow field at the burner outlet and inside the furnace, and ensuring the stability and economy of boiler combustion. Summary of the Invention

[0006] The object of the present invention is to provide a fuel-saving ignition pulverized coal burner with double high-concentration zones, so as to solve the problem that in the prior art, when the fuel-saving ignition pulverized coal burner is in a non-ignition working condition, the pulverized coal concentration distribution mode of "inner thick and outer thin" is opposite to the design of "outer thick and inner thin" of the original boiler burner, which is likely to have a significant impact on the characteristics of the air-powder flow field at the burner outlet and inside the furnace.

[0007] The present invention is achieved through the following technical solutions: A fuel-saving ignition pulverized coal burner with double high-concentration zones includes an ignition device arranged in a combustion cylinder; the burner further includes a flow guiding device, and the flow guiding device includes a main cylinder and a flow disturbing structure arranged on the outer circumference of the main cylinder. Among them, the main cylinder is connected to the inner wall of the combustion cylinder through a support member, and the flow disturbing structure is formed into a structure protruding in the radial direction for disturbing the flow direction of the mixed gas.

[0008] Optionally, the flow disturbing structure is formed as follows: along the flow direction of the mixed gas, the flow disturbing structure has a flow disturbing section, a transition section, and a buffer section. Among them, the diameter of the flow disturbing section gradually increases, the diameter of the transition section is of equal diameter, and the diameter of the buffer section gradually decreases.

[0009] Optionally, the flow disturbing structure is in a wave shape and is arranged along the circumferential direction of the main cylinder, and the wave-shaped flow disturbing structure has wave crests and wave troughs.

[0010] Optionally, both the wave crests and the wave troughs are formed into curve shapes.

[0011] Optionally, the flow disturbing structure is formed into a plurality of convex platforms protruding in the radial direction, and the convex platforms are evenly spaced along the circumferential direction of the main cylinder.

[0012] Optionally, at least five convex platforms are provided.

[0013] Optionally, the outer surface of the convex platform is formed into an arc surface.

[0014] Optionally, the convex platform has an expansion section and a contraction section. Along the flow direction of the mixed gas, the width of the contraction section gradually decreases in the circumferential direction.

[0015] Optionally, the thickness of the contraction section gradually thickens along the flow direction of the mixed gas, and the thickness of the contraction section gradually thins along the flow direction of the mixed gas.

[0016] Optionally, the ignition device is fixedly connected to the combustion cylinder; and / or, the main cylinder is connected to the inner wall of the combustion cylinder through a support member, where the support member is formed into three support ribs spaced along the circumferential direction, and both ends of the support ribs are respectively fixedly connected to the main cylinder and the combustion cylinder.

[0017] The beneficial effects of the invention of the present disclosure compared with the prior art are as follows: Through the above technical solution, the spoiler structure can distribute the pulverized coal flow passing through the burner, so that the mixed gas entering the central part of the combustion cylinder continues to concentrate towards the central axis position, and then a high-concentration pulverized coal gas flow region is formed in the center for realizing the ignition process at the heat source outlet of the oil-saving ignition device. For the pulverized coal that does not enter the central part of the combustion cylinder, under the action of the diversion device, it diffuses radially towards the outer wall direction, and a high-concentration pulverized coal distribution region is formed in the region of the outer ring of the inner hole of the combustion cylinder. Two high-concentration pulverized coal regions can be formed on the cross section at the outlet of the burner: the central region and the wall-attached region. In the region between the two high-concentration pulverized coal regions, due to the intervention of the spoiler device, less gas diffuses, and the pulverized coal forms a low-concentration region.

[0018] Compared with the "inner concentrated and outer lean" pulverized coal distribution characteristic of the conventional ignition burner, the double high-concentration region burner structure reduces the central air rate and central pulverized coal rate in the central combustion cylinder, forming a double-region high-concentration pulverized coal region distribution characteristic at the center and outer ring of the heat source outlet. Among them, the central concentration of the first-stage cylinder continues to match the primary air velocity, continuously meeting the functional requirements of the oil-saving ignition working condition. The annular high-concentration distribution characteristic of the outer ring wall-attached region is closer to the "outer concentrated and inner lean" distribution characteristic of the original burner (non-oil-saving ignition type), and is closer to the design characteristic of the original boiler burner in the non-ignition state, reducing the change and influence of the non-ignition working condition on the furnace internal flow field, which is beneficial to the working condition adjustment of the boiler operation, thus solving the problems of the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings required for the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts. In the drawings: Figure 1 is a schematic cross-sectional structure view of the double high-concentration region oil-saving ignition pulverized coal burner provided by the present invention in one embodiment; Figure 2 is a schematic three-dimensional structure view of the diversion device in the double high-concentration region oil-saving ignition pulverized coal burner provided by the present invention in one embodiment; Figure 3 is a schematic side view structure view of the diversion device in the double high-concentration region oil-saving ignition pulverized coal burner provided by the present invention in one embodiment; Figure 4 is a schematic cross-sectional structure view of the double high-concentration region oil-saving ignition pulverized coal burner provided by the present invention in another embodiment; Figure 5 Schematic three - dimensional structure diagram of the flow - guiding device in another embodiment of the double - high - concentration - zone fuel - saving ignition pulverized coal burner provided by the present invention; Figure 6 Schematic side - view structure diagram of the flow - guiding device in another embodiment of the double - high - concentration - zone fuel - saving ignition pulverized coal burner provided by the present invention; Figure 7 Schematic cross - sectional structure diagram of the double - high - concentration - zone fuel - saving ignition pulverized coal burner provided by the present invention in yet another embodiment; Figure 8 Schematic three - dimensional structure diagram of the flow - guiding device in yet another embodiment of the double - high - concentration - zone fuel - saving ignition pulverized coal burner provided by the present invention; Figure 9 Schematic side - view structure diagram of the flow - guiding device in yet another embodiment of the double - high - concentration - zone fuel - saving ignition pulverized coal burner provided by the present invention; Figure 10 Schematic partially - enlarged structure diagram of the flow - guiding device in yet another embodiment of the double - high - concentration - zone fuel - saving ignition pulverized coal burner provided by the present invention; Figure 11 Schematic mapping relationship diagram of the double - high - concentration - zone fuel - saving ignition pulverized coal burner provided by the present invention in one embodiment. Among them, the left - hand part of the drawing is the schematic diagram of the mixed gas flow direction of the pulverized coal burner, and the right - hand part of the drawing is the side - view of the pulverized coal burner, and shows the high - concentration zone and low - concentration zone of pulverized coal.

[0020] Reference numerals in the drawings and corresponding component names: 1 - combustion cylinder, 2 - ignition device, 3 - flow - guiding device, 31 - main cylinder, 32 - flow - disturbing structure, 3211 - flow - disturbing section, 3212 - transition section, 3213 - buffer section, 3221 - wave crest, 3221 - wave trough, 323 - convex platform, 3231 - expansion section, 3232 - contraction section, 4 - concentration ring, 5 - support member, 6 - high - concentration zone, 7 - low - concentration zone. Detailed implementation manners

[0021] The present invention will be further described below in conjunction with the drawings and specific embodiments. It should be noted here that although the description of these embodiments is used to help understand the present invention, it does not constitute a limitation to the present invention. The specific structural and functional details disclosed herein are only used to describe the embodiments of the examples of the present invention. However, the present invention can be embodied in many alternative forms and should not be construed as limited to the embodiments set forth herein.

[0022] According to the specific implementation manners of the present disclosure, a double - high - concentration - zone fuel - saving ignition pulverized coal burner is provided. Among them, Figures 1 to 11 Its specific embodiments are shown.

[0023] Refer to Figures 1 to 11As shown in the figure, the double high-concentration zone fuel-saving ignition pulverized coal burner includes an ignition device 2 arranged in a combustion cylinder 1. The burner further includes a flow guiding device 3, and the flow guiding device 3 includes a main cylinder 31 and a flow disturbing structure 32 arranged on the outer periphery of the main cylinder 31. Among them, the main cylinder 31 is connected to the inner wall of the combustion cylinder 1, and the flow disturbing structure 32 is formed into a structure protruding in the radial direction for disturbing the flow direction of the mixed gas.

[0024] During the working process, after the mixed gas formed by the pulverized coal and air enters the combustion cylinder 1, it will flow through the main cylinder 31 of the flow guiding device 3. The main cylinder 31 is firmly connected to the inner wall of the combustion cylinder 1, providing a preliminary guiding channel for the mixed gas, so that the mixed gas can flow more orderly towards the outlet direction of the ignition device 2. When the mixed gas continues to move forward and encounters the flow disturbing structure 32 protruding in the radial direction on the outer periphery of the main cylinder 31, its flow direction will be disturbed. The flow disturbing structure 32 breaks the original laminar flow state of the mixed gas, prompting the mixed gas to generate turbulent motion. This turbulent motion can greatly increase the contact area and mixing uniformity between the pulverized coal and air. On the one hand, more sufficient mixing helps the pulverized coal to be quickly ignited near the outlet of the ignition device 2, improving the ignition efficiency; on the other hand, the turbulent motion can also make the heat generated by combustion spread more evenly, contributing to the stable combustion of the subsequent pulverized coal, reducing the situation of incomplete local combustion or too high or too low temperature, and enhancing the stability of combustion.

[0025] Through the above technical solution, the flow disturbing structure 32 can distribute the pulverized coal flow passing through the burner, enabling the mixed gas entering the central part of the combustion cylinder 1 to continue to concentrate towards the central axis position, and then forming a high-concentration pulverized coal gas flow region in the center for realizing the ignition process at the heat source outlet of the fuel-saving ignition device 2. For the pulverized coal that does not enter the central part of the combustion cylinder 1, under the action of the flow guiding device 3, it diffuses radially towards the outer wall direction, forming a high-concentration pulverized coal distribution area in the area of the outer ring of the inner hole of the combustion cylinder 1. Two high-concentration pulverized coal zones can be formed on the cross section of the burner outlet: the central area and the wall-attached area. And in the area between the two high-concentration pulverized coal zones, due to the intervention of the flow disturbing device, less gas diffuses, and the pulverized coal forms a low-concentration zone 7.

[0026] Compared with the "inner rich and outer lean" pulverized coal distribution characteristic of the conventional ignition burner, the structure of the double high-concentration zone 6 burner reduces the central air rate and central pulverized coal rate in the combustion cylinder, forming a double-region high-concentration pulverized coal region distribution characteristic at the center and outer ring of the heat source outlet. Among them, the central concentration of the first-stage cylinder continues to match the wind speed, continuously meeting the functional requirements of the fuel-saving ignition working condition. The annular high-concentration distribution characteristic of the outer wall-attached area is closer to the "outer rich and inner lean" distribution characteristic of the original burner (non-fuel-saving ignition type). In the non-ignition state, it is closer to the design characteristics of the original boiler burner, reducing the change and influence of the non-ignition working condition on the furnace internal flow field, which is beneficial to the working condition adjustment of boiler operation, thus solving the existing technical problems.

[0027] It should be noted that the orientation terms such as "inside" and "outside" refer to the "inside" and "outside" relative to the contour of the component. The direction towards the axis of the component (which can be understood in combination with Figure 1 for understanding) is "inside", and vice versa is "outside". In addition, it should be noted that the terms such as "first" and "second" are used to distinguish one element from another, and do not have sequentiality and importance. Furthermore, in the following description of the drawings, the same reference numerals in different drawings represent the same elements.

[0028] In an embodiment provided by the present disclosure, the spoiler structure 32 is formed as follows: along the flow direction of the mixed gas, the spoiler structure 32 has a spoiler section 3211, a transition section 3212, and a buffer section 3213. Among them, the diameter of the spoiler section 3211 gradually increases, the diameter of the transition section 3212 is of equal diameter, and the diameter of the buffer section 3213 gradually decreases.

[0029] Based on the structure of the spoiler section 3211, the gas can gradually come into contact with the inclined surface, thereby disrupting the flow direction of the mixed gas, causing the pulverized coal that has not entered the central combustion cylinder 1 to diffuse radially outward along the outer wall under the action of the spoiler section 3211, forming a high-concentration pulverized coal distribution area in the outer circle of the burner. The transition section 3212 and the buffer section 3213 are beneficial for guiding the flow of the mixed gas and moderate residence, and indirectly form a low-concentration area 7. Compared with the spoiler structure 32 of a single structure, the segmented design can achieve differential spoilers in different flow channel regions, avoiding problems such as a sharp increase in resistance or insufficient mixing caused by excessive disturbance of the traditional spoiler structure 32, and can better meet the requirements of the double high-concentration area 6 burner for the pulverized coal concentration distribution and the stability of the flow field.

[0030] In another embodiment provided by the present disclosure, the spoiler structure 32 is wavy and is arranged along the circumferential direction of the main cylinder 31. The wavy spoiler structure 32 has wave crests 3221 and wave troughs 3221. The wavy spoiler structure 32 is continuously distributed along the circumferential direction of the main cylinder 31, and its wave crests 3221 and wave troughs 3221 form a periodic concave-convex surface (such as a sine curve profile). When the mixed gas flows through the wave crests 3221, the fluid is forced to flow around the convex surface, and the boundary layer separates at the trailing edge of the wave crests 3221, forming vortices, which is beneficial for forming a high-concentration pulverized coal distribution state in the area outside the outer diameter of the main cylinder 31.

[0031] Furthermore, both the wave crests 3221 and the wave troughs 3221 are formed as curved shapes. The curved surface enables the mixed gas to pass through smoothly, which is beneficial for reducing the dead corners of dust accumulation at the corners, so that a high-concentration mixing area can be formed after the mixed gas flows through.

[0032] In yet another embodiment provided by the present disclosure, the spoiler structure 32 is formed as a plurality of radially protruding bosses 323, and the bosses 323 are evenly spaced along the circumferential direction of the main cylinder 31. Based on the arrangement of the bosses 323, on the one hand, it is beneficial to play a certain disturbing role in the flow direction of the mixed gas, so that the mixed gas gathers towards the grooves between the bosses 323, thereby forming a high-concentration pulverized coal area in the combustion cylinder 1, thus better adapting to the working condition of "thick outside and thin inside" of the original burner of the boiler and improving the stability and economy of boiler combustion.

[0033] Specifically, the bosses 323 are configured to be at least five. When the number n of the bosses 323 < 5 (such as n = 4), the circumferential interval θ > 90°, and the distance between adjacent bosses 323 is relatively large, it is difficult to form a stable high-concentration pulverized coal area. When n = 5, θ = 72°, which is beneficial to help the pulverized coal in the mixed gas gather better. For the number of the bosses 323, those skilled in the art can flexibly configure it under the technical concept of the present disclosure.

[0034] Furthermore, the outer surface of the boss 323 is formed as an arc surface. Due to the arrangement of the arc surface, it guides the high-speed airflow to form a spiral vortex. At the same time, based on the smooth design of the gas, it is also beneficial to guide the smooth flow of the mixed gas.

[0035] Furthermore, the boss 323 has an expansion section 3231 and a contraction section 3232. Along the flow direction of the mixed gas, the width of the contraction section 3232 gradually becomes smaller in the circumferential direction. The expansion section 3231 causes the fluid to have radial diffusion, and the contraction section 3232 can appropriately reduce the flow rate to help form a high-concentration pulverized coal area.

[0036] Even further, the thickness of the contraction section 3232 gradually becomes thicker along the flow direction of the mixed gas, and the thickness of the contraction section 3232 gradually becomes thinner along the flow direction of the mixed gas. This is beneficial to guiding the mixed gas to gather and forming a dynamic recirculation area, thereby ensuring the pulverized coal concentration in this area.

[0037] In an embodiment provided by the present disclosure, the ignition device 2 is fixedly connected to the combustion cylinder 1. Specifically, the ignition device 1 is welded to the combustion cylinder 1 to ensure the connection strength between the two. Furthermore, the combustion cylinder 1 is also provided with a reinforcing rib, and both ends of the reinforcing rib are respectively connected to the inner wall of the combustion cylinder and the ignition device 2, thereby playing a further supporting and strengthening role for the ignition device 2 to ensure the reliability of the position of the ignition device 2.

[0038] It should be noted that for the "and / or" appearing in the text, it refers to A and / or B, which is intended to represent that there can be three scenarios: only the A scheme exists, only the B scheme exists, and both the A and B schemes exist simultaneously. And for the " / and" appearing in the text, it refers to A / and B, which is intended to represent that there can be two scenarios: only the A scheme exists and both the A and B schemes exist simultaneously.

[0039] In the present disclosure, the main cylinder 31 is connected to the inner wall of the combustion cylinder 1 through the support member 5. Herein, the support member 5 is formed as three support ribs spaced apart in the circumferential direction, and both ends of the support ribs are fixedly connected to the main cylinder 31 and the combustion cylinder 1 respectively.

[0040] The structure of the concentration ring 4 can converge the mixed gas (a mixture of fuel and air), locally increasing the fuel concentration in the ignition area. At the moment of ignition, a higher fuel concentration is more likely to reach the flammable limit, thereby improving the ignition success rate, especially with significant effects in low-load or startup stages. Thus, through the cooperation of the concentration ring 4 and the inner bore of the combustion cylinder 1, the position of the ignition device 2 is defined, keeping it always in the optimal ignition area (such as an area with high turbulent intensity and suitable temperature of the mixed gas).

[0041] The support member 5 is formed as three support ribs spaced apart in the circumferential direction, which can form a stable structure similar to a triangle, being beneficial to evenly bear the radial force and thermal stress between the combustion cylinder 1 and the main cylinder 31, and avoiding deformation or fracture caused by single-point stress. Compared with continuous support or more support ribs, the design of three support ribs can reduce the obstruction to the air flow. The gaps arranged at intervals allow the mixed gas to pass more smoothly, reducing the flow pressure loss and avoiding the influence on the air flow rate and back pressure of the burner due to excessive resistance.

[0042] The above specific embodiments have further elaborated in detail the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

[0043] Finally, it should be noted that the present invention is not limited to the above optional embodiments, and anyone can obtain other various forms of products under the inspiration of the present invention. The above specific embodiments should not be construed as limiting the protection scope of the present invention, and the protection scope of the present invention should be defined by the claims, and the description can be used to interpret the claims.

Claims

1. A double high-concentration zone fuel-saving ignition pulverized coal burner, comprising an ignition device arranged in a combustion cylinder, characterized in that, The burner further includes a flow guiding device, and the flow guiding device includes a main cylinder and a flow disturbing structure arranged on the outer periphery of the main cylinder. Among them, the main cylinder is connected to the inner wall of the combustion cylinder through a support member, and the flow disturbing structure is formed into a structure protruding in the radial direction for disturbing the flow direction of the mixed gas.

2. The double-high-concentration-zone fuel-saving ignition pulverized coal burner according to claim 1, wherein The flow disturbing structure is formed as follows: along the flow direction of the mixed gas, the flow disturbing structure has a flow disturbing section, a transition section, and a buffer section. Among them, the diameter of the flow disturbing section gradually increases, the diameter of the transition section is equal in diameter, and the diameter of the buffer section gradually decreases.

3. The double-high-concentration-zone fuel-saving ignition pulverized coal burner according to claim 1, characterized in that, The flow disturbing structure is wavy and arranged along the circumferential direction of the main cylinder. The wavy flow disturbing structure has wave crests and wave troughs.

4. The double-high-concentration-zone fuel-saving ignition pulverized coal burner according to claim 3, wherein Both the wave crest and the wave trough are formed into curved shapes.

5. The double-high-concentration-zone fuel-saving ignition pulverized coal burner according to claim 1, characterized in that, The flow disturbing structure is formed into a plurality of bosses protruding in the radial direction, and the bosses are evenly spaced along the circumferential direction of the main cylinder.

6. The double-high-concentration-zone fuel-saving ignition pulverized coal burner according to claim 5, wherein The bosses are configured to be at least five.

7. The double-high-concentration-zone fuel-saving ignition pulverized coal burner according to claim 5, wherein, The outer surface of the boss is formed into an arc surface.

8. The double-high-concentration-zone fuel-saving ignition pulverized coal burner according to claim 5, characterized in that, The boss has an extended section and a contracted section. Along the flow direction of the mixed gas, the width of the contracted section gradually decreases in the circumferential direction.

9. The high-concentration and high-efficiency fuel-saving ignition pulverized coal burner according to claim 8, characterized in that, The thickness of the contracted section gradually thickens along the flow direction of the mixed gas, and the thickness of the contracted section gradually thins along the flow direction of the mixed gas.

10. The double-high-concentration-zone fuel-saving ignition pulverized coal burner according to claim 1, characterized in that, The ignition device is fixedly connected to the combustion cylinder; and / or, the main cylinder is connected to the inner wall of the combustion cylinder through a support member, where the support member is formed into three support ribs spaced along the circumferential direction, and both ends of the support ribs are fixedly connected to the main cylinder and the combustion cylinder respectively.

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