An adjustable swirl concentration strong combustion pulverized coal burner

Abstract

The present application relates to a kind of adjustable swirl concentration of strong combustion coal burner, belong to coal combustion technical field;Including from inside to outside in turn cover and connect the center wind pipe, primary air pipe, inner secondary air pipe, outer secondary air pipe, center wind pipe outlet and primary air pipe outlet between being provided with concentration and dilution separation pipe, concentration and dilution separation pipe and center wind pipe between forming thick coal output channel, concentration and dilution separation pipe and primary air pipe between forming dilute coal output channel;Between center wind pipe and primary air pipe, adjustable coal powder concentration mechanism is provided, adjustable coal powder concentration mechanism includes compressed gas action cavity, compressed gas action cavity is located in the side of concentration and dilution separation pipe away from primary air pipe outlet, one circle compressed gas nozzle is set on compressed gas action cavity, the direction of emission of compressed gas nozzle is aimed at the entrance of thick coal output channel;Solved the problem of poor working stability of the coal powder concentration mechanism arranged in the primary air passage of the current swirl coal burner.

Description

Technical Field

[0001] This invention belongs to the field of pulverized coal combustion technology, specifically relating to an adjustable swirl concentration high-intensity pulverized coal burner. Background Technology

[0002] Existing swirl pulverized coal burners are mainly designed for burning bituminous coal with high volatile matter content (V). daf >25%), to control NO x Emissions typically employ a technology that combines dual-adjustment air distribution with concentrated and dilute pulverized coal distribution. This involves installing pulverized coal concentration mechanisms (such as louvers or baffles) within the primary air duct of the burner to create localized high-concentration pulverized coal zones (concentrated zones) and low-concentration zones (dilute zones) at the nozzle. The system operates based on the principle of "stable combustion with ignition in the concentrated zone and assisted combustion and graded nitrogen control in the dilute zone."

[0003] Existing swirl burners use mechanical adjustment devices (such as movable baffles and sliders) to regulate the pulverized coal concentration ratio. These devices suffer from problems such as easy jamming at high temperatures, severe wear, poor reliability, and difficulty in long-term normal operation. Therefore, existing swirl burners cannot achieve effective online adjustment of the pulverized coal concentration ratio, and thus cannot dynamically optimize the pulverized coal concentration required for ignition for different coal qualities (especially difficult-to-burn coals) and different loads (especially low loads).

[0004] Therefore, there is an urgent need for a swirl burner that can reliably adjust the concentration distribution of pulverized coal online to adapt to changes in coal quality and load, thus breaking through the performance bottleneck of existing swirl burners. Summary of the Invention

[0005] This invention overcomes the shortcomings of the prior art and proposes an adjustable swirl-type high-intensity pulverized coal burner; it also solves the problem of poor working stability of the pulverized coal concentration mechanism installed in the primary air channel of the current swirl-type pulverized coal burner.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution.

[0007] An adjustable swirl-type high-intensity pulverized coal burner has an overall central cylindrical structure, including a central air duct, a primary air duct, an inner secondary air duct, and an outer secondary air duct, which are sequentially connected from the inside out. A concentration-dispersion pipe is provided between the outlet of the central air duct and the outlet of the primary air duct, forming a concentrated pulverized coal output channel between the concentration-dispersion pipe and the central air duct, and a depleted pulverized coal output channel between the concentration-dispersion pipe and the primary air duct. An adjustable pulverized coal concentration mechanism is provided between the central air duct and the primary air duct. The adjustable pulverized coal concentration mechanism includes a compressed gas action chamber located on the side of the concentration-dispersion pipe away from the outlet of the primary air duct. A ring of compressed gas nozzles is provided on the compressed gas action chamber, and the spray direction of the compressed gas nozzles is inclined towards one side of the central air duct axis and aimed at the inlet of the concentrated pulverized coal output channel.

[0008] Furthermore, an ignition device is installed in the central air duct, and a central air inlet pipe is installed on the lower side of the end of the central air duct away from its outlet.

[0009] Furthermore, a primary air duct is formed between the central air duct and the primary air duct, and a primary air inlet pipe is installed at the end of the primary air duct away from its outlet, and the primary air inlet pipe is connected to the interior of the primary air duct.

[0010] Furthermore, an inner secondary air duct is formed between the primary air duct and the inner secondary air duct, and an outer secondary air duct is formed between the inner secondary air duct and the outer secondary air duct. A common secondary air box is installed at the end of the inner and outer secondary air ducts away from their outlets. An inner secondary air inlet cavity and an outer secondary air inlet cavity are installed inside the secondary air box. The inner secondary air inlet cavity is connected to the inner secondary air duct, and the outer secondary air inlet cavity is connected to the outer secondary air duct. An inner secondary air damper is installed inside the inner secondary air inlet cavity, and an outer secondary air damper is installed inside the outer secondary air inlet cavity.

[0011] Furthermore, a fixed axial swirl vane for the internal secondary air is installed at the outlet of the internal secondary air duct, and an adjustable axial swirl vane for the external secondary air is installed in the middle of the external secondary air duct.

[0012] Furthermore, a light pulverized coal nozzle is installed at the outlet of the light pulverized coal output channel, and a heavy pulverized coal nozzle is installed at the outlet of the heavy pulverized coal output channel.

[0013] Furthermore, individual nozzles are provided on the outer side of the outlets of the enrichment / dilute separation pipe, the primary air duct, and the inner secondary air duct, and all individual nozzles together constitute the burner nozzle; a swirl is provided on the outer side of the outlet of the outer secondary air duct, and the burner nozzle is located inside the swirl.

[0014] Furthermore, a central flame stabilizer is provided on the outside of the outlet of the central air duct. The central flame stabilizer is an outwardly expanding trumpet-shaped structure, and a ring of circularly arranged sawtooth structures is provided at the opening of one end of the central flame stabilizer.

[0015] Furthermore, the compressed gas action chamber is fixedly installed on the inner side of the primary air duct. The cross-section of the compressed gas action chamber is a triangular structure, and a ring of compressed gas nozzles is set on the side of the compressed gas action chamber facing the concentration-divergence separation pipe.

[0016] Furthermore, the adjustable pulverized coal thickening mechanism also includes a compressed gas main pipe, an airflow regulating valve, and a compressed gas inlet pipe; a compressed gas main pipe is provided on the outside of the external secondary air duct, and the compressed gas main pipe is connected to an external compressed gas source through a compressed gas input pipe. An airflow regulating valve is provided on the compressed gas input pipe, and multiple compressed gas inlet pipes are provided between the compressed gas main pipe and the compressed gas working chamber, with both ends of the compressed gas inlet pipes connected to the inside of the compressed gas main pipe and the inside of the compressed gas working chamber, respectively.

[0017] The beneficial effects of this invention compared to the prior art are as follows: (1) The dynamic, online and reliable adjustment of the coal powder concentration ratio is realized: This is the core advantage of the present invention. By adjusting the pressure and speed of the compressed gas jet, the coal powder concentration distribution at the light and dark powder nozzles and the thick powder nozzles can be changed steplessly, so that the burner can accurately adapt to changes in coal quality and flexibly respond to deep peak adjustment.

[0018] (2) It completely solves the reliability problem of the regulating mechanism: It adopts pure airflow non-contact regulation, without any mechanical parts that need to move in high temperature and high dust environment, fundamentally eliminating the stubborn problems of jamming, wear and failure of traditional mechanical regulating devices, and ensuring long-term, reliable and maintenance-free operation of the regulating function.

[0019] (3) Significantly improved combustion stability and efficiency: The combination of "adjustable airflow richness and leanness" and "serrated strong and stable combustion" structure creates dynamic and optimizable strong ignition and stable combustion conditions. Even under harsh coal quality and low load conditions, it can ensure flame stability, reduce the risk of flameout, improve combustion efficiency, and reduce unburned carbon loss.

[0020] (4) It retains the advantages of low-NOx combustion: While achieving flexible adjustment and enhanced stable combustion, it can still effectively organize staged combustion and control NO through the cooperation of the dual-adjustment swirl system. x Emissions have been reduced, achieving a multi-objective synergistic optimization of stable combustion, high efficiency, and environmental protection. Attached Figure Description

[0021] The present invention will now be described in further detail with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram showing the connection between the adjustable pulverized coal thickening mechanism and the primary air duct; Figure 3 yes Figure 2 Side sectional view at the compressed gas inlet pipe; Figure 4 This is an axial view of the central flame stabilizer; Among them, 1 is the central air duct, 2 is the primary air duct, 3 is the inner secondary air duct, 4 is the outer secondary air duct, 5 is the concentrated / dilute separation pipe, 6 is the compressed gas action chamber, 7 is the compressed gas nozzle, 8 is the ignition device, 9 is the central air input pipe, 10 is the primary air input pipe, 11 is the secondary air box, 12 is the inner secondary air damper, 13 is the outer secondary air damper, 14 is the inner secondary air fixed axial swirl vane, 15 is the outer secondary air adjustable axial swirl vane, 16 is the dilute powder nozzle, 17 is the concentrated powder nozzle, 18 is the burner nozzle, 19 is the swirl nozzle, 20 is the central flame stabilizer, 21 is the compressed gas main pipe, 22 is the airflow regulating valve, 23 is the compressed gas inlet pipe, and 24 is the baffle. Detailed Implementation

[0022] To make the technical problem to be solved, the technical solution, and the beneficial effects of the present invention clearer, the present invention will be further described in detail with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solution of the present invention will be described in detail below with reference to the embodiments and accompanying drawings, but the scope of protection is not limited thereto.

[0023] like Figure 1 As shown in Figure 4, this invention provides an adjustable swirl-type high-intensity pulverized coal burner, which has a central cylindrical structure. It includes a central air duct 1, a primary air duct 2, an inner secondary air duct 3, and an outer secondary air duct 4, which are sequentially connected from the inside out. A concentration-dispersion pipe 5 is provided between the outlet of the central air duct 1 and the outlet of the primary air duct 2, forming a concentrated pulverized coal output channel between the concentration-dispersion pipe 5 and the central air duct 1, and a dilute pulverized coal output channel between the concentration-dispersion pipe 5 and the primary air duct 2. An adjustable pulverized coal concentration mechanism is provided between the central air duct 1 and the primary air duct 2. The adjustable pulverized coal concentration mechanism includes a compressed gas action chamber 6, located on the side of the concentration-dispersion pipe 5 away from the outlet of the primary air duct 2. A ring of compressed gas nozzles 7 is provided on the compressed gas action chamber 6, with the nozzles 7 inclined towards the axis of the central air duct 1 and aligned with the inlet of the concentrated pulverized coal output channel.

[0024] The end of the central air duct 1 away from its outlet is kept closed, and an ignition device 8 is installed in the central air duct 1. A central air inlet pipe 9 is provided on the lower side of the end of the central air duct 1 away from its outlet. The interior of the central air inlet pipe 9 is connected to the interior of the central air duct 1, and the axis of the central air inlet pipe 9 is perpendicular to the axis of the central air duct 1.

[0025] A ring-shaped primary air duct is formed between the central air duct 1 and the primary air duct 2, and a concentration-degradation separation pipe 5 is installed on the outlet side of the primary air duct. A primary air inlet pipe 10 is installed at the end of the primary air duct 2 away from its outlet. The axis of the primary air inlet pipe 10 is perpendicular to the axis of the primary air duct 2. The primary air inlet pipe 10 is connected to the interior of the primary air duct, and a mixed airflow of pulverized coal and primary air is introduced into the interior of the primary air duct through the primary air inlet pipe 10.

[0026] A ring-shaped inner secondary air duct is formed between the primary air duct 2 and the inner secondary air duct 3, and a ring-shaped outer secondary air duct is formed between the inner secondary air duct 3 and the outer secondary air duct 4. A common secondary air box 11 is installed at the ends of both the inner and outer secondary air ducts furthest from their outlets. Inside the secondary air box 11 are two independent secondary air inlet chambers: an inner secondary air inlet chamber and an outer secondary air inlet chamber. The inlet of the secondary air box 11 is connected to both secondary air inlet chambers. The inner secondary air inlet chamber is connected to the end of the inner secondary air duct furthest from its outlet, and the outer secondary air inlet chamber is connected to the end of the outer secondary air duct furthest from its outlet. An inner secondary air damper 12 is installed inside the inner secondary air inlet chamber to regulate the secondary air volume input from the secondary air box 11 to the inner secondary air duct; an outer secondary air damper 13 is installed inside the outer secondary air inlet chamber to regulate the secondary air volume input from the secondary air box 11 to the outer secondary air duct.

[0027] An internal secondary air fixed axial swirl vane 14 is installed at the outlet of the internal secondary air duct. The angle of the internal secondary air fixed axial swirl vane 14 is fixed, and the internal secondary air with stable swirl intensity is generated by the internal secondary air fixed axial swirl vane 14, and a stable swirl is output to the outside to establish a basic recirculation zone. An external secondary air adjustable axial swirl vane 15 is installed in the middle of the external secondary air duct. The angle of the external secondary air adjustable axial swirl vane 15 is adjustable, and the external secondary air with adjustable swirl intensity is generated by the external secondary air adjustable axial swirl vane 15, and the combustion aerodynamic field is flexibly organized. The internal secondary air and external secondary air output to the outside are mixed with the primary air at the burner outlet and combusted.

[0028] A low-concentration coal powder nozzle 16 is installed at the outlet of the low-concentration coal powder output channel. The low-concentration coal powder is sprayed out to the outside through the low-concentration coal powder nozzle 16 to provide initial oxygen and assist in combustion.

[0029] A concentrated pulverized coal nozzle 17 is installed at the outlet of the concentrated pulverized coal output channel. High-concentration pulverized coal is sprayed out through the concentrated pulverized coal nozzle 17 to form a fuel-rich zone to stabilize combustion and suppress NO. x .

[0030] An outwardly flared, funnel-shaped individual nozzle is provided on the outside of the outlets of the concentration-lean separation pipe 5, the primary air pipe 2, and the inner secondary air pipe 3. All individual nozzles together constitute the burner nozzle 18, and the final ejected flow pattern is determined by the burner nozzle 18.

[0031] An outwardly flared swirl 19 is provided on the outside of the outlet of the external secondary air duct 4. The burner nozzle 18 is located inside the swirl 19. The internal area of ​​the swirl 19 is the key area where the various air streams finally mix, form, and are injected into the furnace.

[0032] A central flame stabilizer 20 is provided on the outside of the outlet of the central duct 1. The central flame stabilizer 20 is an outwardly flared structure. A circular array of sawtooth structures is provided at the opening of one end of the central flame stabilizer 20. The sawtooth structure is used to enhance the mixing and combustion effect between the high-concentration pulverized coal airflow and the high-temperature flue gas.

[0033] The compressed gas action chamber 6 has a circular structure and is fixedly installed on the inner side of the primary air duct 2. The cross-section of the compressed gas action chamber 6 is triangular, and a ring of compressed gas nozzles 7 is located on the side of the compressed gas action chamber 6 facing the concentration-divergence separation pipe 5, and the ring of compressed gas nozzles 7 is arranged in a circular array around the axis of the central air duct 1.

[0034] The adjustable pulverized coal thickening mechanism also includes a compressed gas main pipe 21, an airflow regulating valve 22, and compressed gas inlet pipes 23. A circular compressed gas main pipe 21 is located outside the external secondary air duct 4. The compressed gas main pipe 21 is connected to an external compressed gas source via a compressed gas inlet pipe. An airflow regulating valve 22 is installed on the compressed gas inlet pipe to control the flow rate of compressed gas entering the compressed gas main pipe 21. Eight compressed gas inlet pipes 23 are arranged in a circular array between the compressed gas main pipe 21 and the compressed gas working chamber 6. The compressed gas inlet pipes 23 extend radially along the central air duct 1, passing through the external secondary air duct 4, the inner secondary air duct 3, and the primary air duct 2. Both ends of the compressed gas inlet pipes 23 are connected to the interior of the compressed gas main pipe 21 and the interior of the compressed gas working chamber 6, respectively.

[0035] Compressed gas from the compressed gas source enters the compressed gas main pipe 21 through the compressed gas inlet pipe. The compressed gas inside the main pipe 21 then enters the compressed gas action chamber 6 through eight compressed gas inlet pipes. The compressed gas inside the action chamber 6 is then ejected into the primary air duct 2 through a ring of compressed gas nozzles 7. The pressure of the compressed gas inside the action chamber 6 can be adjusted by controlling the opening of the airflow regulating valve 22, thereby regulating the flow rate of the compressed gas jet ejected from the nozzles 7.

[0036] A pressure monitoring device is installed inside the compressed gas main pipe 21 to monitor the pressure inside the compressed gas main pipe 21.

[0037] Inside the primary air duct 2, a baffle 24 is also installed. The baffle 24 is located between the compressed gas action chamber 6 and the concentration separation pipe 5. The baffle 24 has a trumpet-shaped structure. The inner diameter of the opening of the baffle 24 on the side closer to the compressed gas action chamber 6 is larger than the inner diameter of the opening of the baffle 24 on the side closer to the concentration separation pipe 5. The baffle 24 maintains a gap with the compressed gas action chamber 6 and the support of the concentration separation pipe 5.

[0038] The working principle of this invention is as follows: When the boiler is running, the primary air flow containing pulverized coal flows through the compressed gas action chamber 6 and the baffle 24. Under the action of the baffle 24, some of the pulverized coal particles in the primary air flow are guided into the concentrated pulverized coal output channel. At the same time, the high-speed compressed gas jet (80-120m / s) ejected from the compressed gas nozzles 7 on the compressed gas action chamber 6 directly acts on the primary air flow containing pulverized coal. Using the momentum of the high-speed air flow, it continues to "push" some of the pulverized coal particles into the inner concentrated pulverized coal output channel. This results in an increase in the amount of coal powder entering the concentrated coal powder output channel and a decrease in the amount entering the dilute coal powder output channel. Consequently, the primary airflow flowing into the concentrated coal powder output channel contains more coal powder, causing the concentrated coal powder nozzle 17 at the outlet of the concentrated coal powder output channel to eject a high-concentration coal powder airflow. Conversely, the primary airflow flowing into the dilute coal powder output channel contains less coal powder, causing the dilute coal powder nozzle 16 at the outlet of the dilute coal powder output channel to eject a low-concentration coal powder airflow. This creates a distribution of concentrated coal powder in the center and dilute coal powder on the periphery at the burner nozzle.

[0039] When it is necessary to increase the pulverized coal concentration inside the concentrated pulverized coal output channel, the opening of the airflow regulating valve 22 is increased, which increases the compressed gas pressure inside the compressed gas action chamber 6 and the compressed gas velocity ejected from the compressed gas nozzle 7. This guides more primary air containing pulverized coal into the inner concentrated pulverized coal output channel. Thus, the primary air flowing into the concentrated pulverized coal output channel contains more pulverized coal, resulting in a significant increase in the pulverized coal concentration at the concentrated pulverized coal nozzle 17 area near the central flame stabilizer 20, while the pulverized coal concentration at the desalinated pulverized coal nozzle 16 area away from the central flame stabilizer 20 is relatively reduced, i.e., the concentration-to-lean ratio increases. This adjustment method has no high-temperature mechanical moving parts, fundamentally avoiding jamming and wear problems, achieving high reliability, sensitivity, and durability in adjustment. This is a fundamental characteristic that distinguishes it from traditional fixed or mechanically adjustable burners.

[0040] After the high-concentration pulverized coal gas stream is ejected, it immediately mixes with the strongly rotating internal secondary air generated by the fixed axial swirl blades 14, forming a strong and stable recirculation zone at the tail of the central flame stabilizer 20. The airflow output from the central duct 1 generates strong turbulent airflow under the action of the sawtooth structure of the central flame stabilizer 20, promoting rapid mixing and combustion of the high-temperature recirculation flue gas with the high-concentration pulverized coal, ensuring timely ignition and stable combustion, and significantly improving the burner's low-load stable combustion capability and adaptability to difficult-to-burn coal types. Simultaneously, the external secondary air with adjustable swirl intensity is timely mixed into the outer periphery of the flame, completing combustion and controlling NO. x generate.

[0041] By adjusting the compressed gas pressure inside the compressed gas action chamber 6 in real time, the concentration distribution of pulverized coal can be changed effectively and reliably online, so that the pulverized coal combustion is always in the best working state, achieving safe, stable, efficient and low-NOx operation under all working conditions from full load to deep low load.

[0042] This invention retains the mature dual-adjustable swirl air distribution system and organically combines it with adjustable concentration technology. The stable swirl of the inner secondary air and the central flame stabilizer 20 together construct the basic recirculation zone; the adjustable outer secondary air achieves air grading around the flame, controlling NO. x The innovative "pneumatic concentration adjustment" system allows the burner to dynamically shape the pulverized coal concentration field most favorable to the current coal quality and different loads, ensuring the burner operates at its optimal condition.

[0043] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A high-intensity pulverized coal burner with adjustable swirl concentration, characterized in that: The whole is a central cylindrical structure, including a central air duct (1), a primary air duct (2), an inner secondary air duct (3), and an outer secondary air duct (4) connected sequentially from the inside to the outside. A concentration separation pipe (5) is set between the outlet of the central air duct (1) and the outlet of the primary air duct (2). A concentrated coal powder output channel is formed between the concentration separation pipe (5) and the central air duct (1), and a dilute coal powder output channel is formed between the concentration separation pipe (5) and the primary air duct (2). An adjustable coal powder concentration mechanism is set between the central air duct (1) and the primary air duct (2). The adjustable coal powder concentration mechanism includes a compressed gas action chamber (6). The compressed gas action chamber (6) is located on the side of the concentration separation pipe (5) away from the outlet of the primary air duct (2). A ring of compressed gas nozzles (7) is set on the compressed gas action chamber (6). The spray direction of the compressed gas nozzles (7) is inclined towards the axis of the central air duct (1) and is aligned with the entrance of the concentrated coal powder output channel. Inside the primary air duct (2), a baffle (24) is installed. The baffle (24) is located between the compressed gas action chamber (6) and the concentration separation pipe (5). The baffle (24) has a trumpet-shaped structure. The inner diameter of the opening of the baffle (24) near the compressed gas action chamber (6) is larger than the inner diameter of the opening of the baffle (24) near the concentration separation pipe (5). The baffle (24) maintains a gap with the compressed gas action chamber (6) and the concentration separation pipe (5).

2. The adjustable swirl concentration high-intensity pulverized coal burner according to claim 1, characterized in that: An ignition device (8) is installed in the central air duct (1), and a central air inlet pipe (9) is provided on the lower side of the end of the central air duct (1) away from its outlet.

3. The adjustable swirl concentration high-intensity pulverized coal burner according to claim 1, characterized in that: A primary air duct is formed between the central air duct (1) and the primary air duct (2). A primary air inlet pipe (10) is provided at the end of the primary air duct (2) away from its outlet. The primary air inlet pipe (10) is connected to the interior of the primary air duct.

4. The adjustable swirl concentration high-intensity pulverized coal burner according to claim 1, characterized in that: An inner secondary air duct is formed between the primary air duct (2) and the inner secondary air duct (3), and an outer secondary air duct is formed between the inner secondary air duct (3) and the outer secondary air duct (4). The same secondary air box (11) is provided at the end of the inner secondary air duct (3) and the outer secondary air duct (4) away from their outlets. An inner secondary air inlet cavity and an outer secondary air inlet cavity are provided inside the secondary air box (11). The inner secondary air inlet cavity is connected to the inner secondary air duct, and the outer secondary air inlet cavity is connected to the outer secondary air duct. An inner secondary air damper (12) is installed inside the inner secondary air inlet cavity, and an outer secondary air damper (13) is installed inside the outer secondary air inlet cavity.

5. The adjustable swirl concentration high-intensity pulverized coal burner according to claim 4, characterized in that: An internal secondary air fixed axial swirl vane (14) is installed at the outlet of the internal secondary air duct, and an external secondary air adjustable axial swirl vane (15) is installed in the middle of the external secondary air duct.

6. The adjustable swirl concentration high-intensity pulverized coal burner according to claim 1, characterized in that: A light pulverized coal outlet (16) is installed at the outlet of the light pulverized coal output channel, and a heavy pulverized coal outlet (17) is installed at the outlet of the heavy pulverized coal output channel.

7. The adjustable swirl concentration high-intensity pulverized coal burner according to claim 1, characterized in that: Individual nozzles are provided on the outside of the outlets of the dilute / rich separation pipe (5), the primary air pipe (2), and the inner secondary air pipe (3), and all individual nozzles together constitute the burner nozzle (18); a swirl (19) is provided on the outside of the outlet of the outer secondary air pipe (4), and the burner nozzle (18) is located inside the swirl (19).

8. The adjustable swirl concentration high-intensity pulverized coal burner according to claim 1, characterized in that: A central flame stabilizer (20) is provided on the outside of the outlet of the central air duct (1). The central flame stabilizer (20) is an outwardly expanding trumpet-shaped structure. A circular array of sawtooth structures is provided at the opening of one end of the central flame stabilizer (20).

9. The adjustable swirl concentration high-intensity pulverized coal burner according to claim 1, characterized in that: The compressed gas action chamber (6) is fixedly installed on the inner side of the primary air duct (2). The cross-section of the compressed gas action chamber (6) is a triangular structure, and a ring of compressed gas nozzles (7) is set on the side of the compressed gas action chamber (6) facing the concentration separation pipe (5).

10. The adjustable swirl concentration high-intensity pulverized coal burner according to claim 9, characterized in that: The adjustable coal powder thickening mechanism also includes a compressed gas main pipe (21), an airflow regulating valve (22), and a compressed gas inlet pipe (23). A compressed gas main pipe (21) is provided on the outside of the external secondary air duct (4). The compressed gas main pipe (21) is connected to an external compressed gas source through a compressed gas inlet pipe. An airflow regulating valve (22) is provided on the compressed gas inlet pipe. Multiple compressed gas inlet pipes (23) are provided between the compressed gas main pipe (21) and the compressed gas action chamber (6). The two ends of the compressed gas inlet pipes (23) are respectively connected to the inside of the compressed gas main pipe (21) and the inside of the compressed gas action chamber (6).

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