Stable-combustion bluff body slotted cluster pipe combustor
By setting a slotted bundle tube bluff body at the center of the primary air burner nozzle body, the problem of poor adaptability to coal types in traditional bluff body burners is solved, achieving efficient and stable operation of the burner and cost reduction.
Patent Information
- Application Number
- CN202511938143.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-22
- Publication Date
- 2026-02-27
AI Technical Summary
Traditional bluff burners have poor adaptability to different types of coal, leading to increased operating costs and reduced system economy.
Various shapes of slotted bundled tube blunt bodies are designed. By setting slotted bundled tube blunt bodies in the center of the primary air burner nozzle body, the coal powder velocity in the central area of the nozzle is reduced, the coal powder concentration is increased, and the ignition efficiency and combustion stability are improved.
It enhances adaptability to different coal types, improves combustion efficiency and stability, reduces blunt wear, and reduces operating costs.
Smart Images
Figure CN121576579A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of thermal power generation technology, and in particular to a stable combustion bluff body slotted bundled tube burner. Background Technology
[0002] In the field of pulverized coal combustion technology, the burner, as the core component of the boiler system, directly affects the effectiveness of pulverized coal ignition, stable combustion, burnout, and pollutant emission control through its structural design and operational performance. A bluff body burner is a combustion device that stabilizes the flame by creating a recirculation zone through a non-streamlined obstruction—a "bluff body"—in the airflow channel. It is widely used in gas turbines, industrial boilers, pulverized coal boilers, and aero engines, and is particularly suitable for stable combustion requirements under low-volatile coal types, low loads, or variable operating conditions.
[0003] Traditional primary air burners mostly adopt a straight cylindrical or simple bluff body structure, which has revealed many problems in actual operation. The existing bluff body structure has a single form and poor adaptability to different coal types. During operation, it is often necessary to assist in stabilizing combustion by increasing the primary air temperature or increasing the amount of auxiliary fuel oil, which leads to increased operating costs and reduced system economy.
[0004] Therefore, those skilled in the art need to provide a stable combustion bluff body slotted bundled tube burner, which enhances adaptability to different coal types and improves ignition efficiency and combustion stability by designing bluff bodies of various shapes of slotted bundled tubes. Summary of the Invention
[0005] The purpose of this invention is to provide a stable combustion bluff body slotted bundled tube burner. By optimizing the structure of the primary air burner nozzle body, the coal powder velocity in the central area of the nozzle is effectively reduced, the coal powder concentration is increased, and the ignition efficiency and combustion stability are improved. By designing bluff bodies with slotted bundled tubes of various shapes, the adaptability to different coal types is enhanced, and the combustion efficiency is improved.
[0006] To achieve the above objectives, the present invention provides a stable combustion bluff body slotted bundled tube burner, comprising a primary air burner nozzle body and a slotted bundled tube bluff body, wherein a plurality of slotted bundled tubes are arranged at intervals and connected together to form the slotted bundled tube bluff body, the slotted bundled tube bluff body is connected to the outlet end of the center of the primary air burner nozzle body, and the extension direction of the slotted bundled tubes is consistent with the flow direction of the primary air pulverized coal gas flow of the primary air burner nozzle body.
[0007] Preferably, the slotted bundled tubes are fixed together by welding steel bars to form a slotted bundled tube body, and the slotted bundled tubes are connected to the primary air burner nozzle body by welding steel bars.
[0008] Preferably, the overall shape of the slit bundle tube blunt body is rectangular, circular, or triangular.
[0009] Preferably, the two ends of the slotted bundle tube of the slotted bundle tube blunt body are uniformly provided with slots along the longitudinal direction, or the slotted bundle tube of the slotted bundle tube blunt body is uniformly provided with openings along the longitudinal direction.
[0010] Preferably, the slotted bundled tube of the slotted bundled tube blunt body is a tube of equal diameter.
[0011] Preferably, the slotted bundled tube of the slotted bundled tube blunt body is a conical tube.
[0012] Preferably, the slotted bundled tube is a hollow tube, and the outer surface of the slotted bundled tube is a smooth surface.
[0013] Preferably, the outer surface of the slotted bundle tube is provided with longitudinal ribs to enhance heat exchange.
[0014] The advantages and positive effects of the stable combustion bluff body slotted bundled tube burner described in this invention are: This invention utilizes a slit-type bundled tube blunt body located at the center of the primary air burner nozzle body. When the primary air-coal gas flows through the slit-type bundled tube, its velocity is reduced by friction between the inner and outer sides of the tube. The gas flow and coal powder particles slow down here, preventing the blunt body from burning out and reducing its wear. By reducing the gas flow velocity in the central area, the slit-type bundled tube reduces the velocity of the coal powder particles in the central area, thereby increasing the coal powder particle concentration, which is beneficial to ignition and combustion stability.
[0015] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of one structure of a fire-stabilized bluff body slotted bundled tube burner according to the present invention; Figure 2 for Figure 1 A longitudinal sectional view; Figure 3 This is a top enlarged view of the slotted bundle tube of the present invention; Figure 4 This is a schematic diagram of the second structure of the slotted bundle tube of the present invention; Figure 5 This is a schematic diagram of the third structure of the slotted bundle tube of the present invention; Figure 6 for Figure 5 A longitudinal sectional view; Figure 7 for Figure 5 A top-down magnified view; Figure 8 This is a longitudinal sectional view of the fourth structure of a fire-stabilized bluff body slotted bundled tube burner according to the present invention; Figures 9-11 This is a schematic diagram showing different overall shapes of a stable combustion bluff body slotted bundled tube burner according to the present invention.
[0017] Figure Labels 1. Primary air burner nozzle body; 2. Slotted bundled tube blunt body; 3. Reinforcing steel. Detailed Implementation
[0018] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0019] In this application, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. In case of any inconsistency, the meaning set forth in this specification or derived from the content described herein shall prevail. Furthermore, the terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit the scope of this application.
[0020] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
[0021] like Figures 1-11 As shown, a slit bundled tube burner with stable combustion includes a primary air burner nozzle body 1 and a slit bundled tube slit body 2. Multiple slit bundled tubes are arranged at intervals and connected together to form the slit bundled tube slit body 2. The slit bundled tube slit body 2 is connected to the outlet end of the center of the primary air burner nozzle body 1. The extension direction of the slit bundled tubes is consistent with the flow direction of the primary air pulverized coal gas flow of the primary air burner nozzle body 1.
[0022] The slotted bundled tubes are fixed together by welding steel bars 3 to form a blunt body of the slotted bundled tube. The slotted bundled tube is connected to the primary air burner nozzle body 1 by welding steel bars 3.
[0023] One implementation example Figures 1-3As shown, the overall shape of the slotted bundled tube blunt body 2 is rectangular. Slots are evenly distributed longitudinally at both ends of the slotted bundled tube of the slotted bundled tube blunt body 2. The slotted bundled tube of the slotted bundled tube blunt body 2 is a tube of equal diameter.
[0024] The second implementation example Figure 4 As shown, the overall shape of the slotted bundled tube blunt body 2 is rectangular. The slotted bundled tube of the slotted bundled tube blunt body 2 has openings evenly distributed along its longitudinal direction. The slotted bundled tube of the slotted bundled tube blunt body 2 is a tube of uniform diameter.
[0025] The third implementation example Figures 5-7 As shown, the overall shape of the slotted bundled tube blunt body 2 is rectangular. Slots are evenly distributed longitudinally at both ends of the slotted bundled tube of the slotted bundled tube blunt body 2. The slotted bundled tube of the slotted bundled tube blunt body 2 is a conical tube.
[0026] Fourth implementation example Figure 8 As shown, the overall shape of the slotted bundled tube blunt body 2 is rectangular. The slotted bundled tube of the slotted bundled tube blunt body 2 has openings evenly distributed along its longitudinal direction. The slotted bundled tube of the slotted bundled tube blunt body 2 is a conical tube.
[0027] In all the above embodiments, the overall shape of the slit bundle tube blunt body 2 can be replaced with a circle or a triangle, such as... Figures 9-11 As shown.
[0028] Specifically, the slotted bundled tube is a hollow tube with a smooth outer surface.
[0029] Specifically, longitudinal fins are provided on the outer surface of the slotted bundle tube to enhance heat exchange.
[0030] The present invention provides a slit bundle tube blunt body 2 at the center of the primary air burner nozzle body. When the primary air and coal flow through the slit bundle tube blunt body 2, its flow velocity is reduced by the friction between the inner and outer sides of the slit bundle tube. The air flow and coal powder particles are slowed down here, avoiding the burning of the blunt body and reducing the wear of the blunt body.
[0031] Furthermore, due to the forced action of the left and right walls of the cavity, the recirculation zone generated after the pulverized coal airflow passes through the bluff body is closed. This ensures that the pulverized coal airflow continues to converge into a single airflow after passing through the bluff body for a certain distance, without altering the original hydrodynamic field within the furnace. This effectively eliminates the possibility of airflow from the upper and lower ends of the bluff body in the bluff body burner being drawn into the recirculation zone, thus guaranteeing the high temperature of the recirculation zone. The slotted bundle tube bluff body 2 reduces the airflow velocity in the central region, thereby decreasing the velocity of the pulverized coal particles in the central region and increasing the pulverized coal particle concentration, which is beneficial for ignition and combustion stability.
[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.
Claims
1. A stable combustion bluff body slotted bundled tube burner, characterized in that: It includes a primary air burner nozzle body and a slotted bundle tube blunt body. Multiple slotted bundle tubes are arranged at intervals and connected together to form the slotted bundle tube blunt body. The slotted bundle tube blunt body is connected to the outlet end of the center of the primary air burner nozzle body. The extension direction of the slotted bundle tube is consistent with the flow direction of the primary air pulverized coal gas flow of the primary air burner nozzle body.
2. The stable combustion bluff body slotted bundled tube burner according to claim 1, characterized in that: The slotted bundled tubes are fixed together by welding steel bars to form a slotted bundled tube body. The slotted bundled tubes are connected to the primary air burner nozzle body by welding steel bars.
3. The stable combustion bluff body slotted bundled tube burner according to claim 2, characterized in that: The overall shape of the slit bundle tube blunt body is rectangular, circular, or triangular.
4. A stable combustion bluff body slotted bundled tube burner according to claim 3, characterized in that: The two ends of the slotted bundled tube of the slit bundled tube blunt body are uniformly provided with slots along the longitudinal direction, or the slotted bundled tube of the slit bundled tube blunt body is uniformly provided with openings along the longitudinal direction.
5. A stable combustion bluff body slotted bundled tube burner according to claim 4, characterized in that: The slotted bundled tube of the blunt body is a tube of equal diameter.
6. A stable combustion bluff body slotted bundled tube burner according to claim 4, characterized in that: The slotted bundled tube of the blunt body is a conical tube.
7. A stable combustion bluff body slotted bundled tube burner according to claim 3, characterized in that: The slotted bundled tube is a hollow tube, and the outer surface of the slotted bundled tube is a smooth surface.
8. A stable combustion bluff body slotted bundled tube burner according to claim 3, characterized in that: The outer surface of the slotted bundle tube is provided with longitudinal ribs to enhance heat exchange.