Nozzle structure of pulverized coal burner

Abstract

The utility model discloses a pulverized coal burner nozzle structure, which comprises a central air pipe and an annular thick-thin separation bluff body arranged on the central air pipe, the annular thick-thin separation bluff body comprises a support and a plurality of high-temperature-resistant splicing blocks, the support is fixed on the central air pipe, and the high-temperature-resistant splicing blocks are connected with the support. The problems of high-temperature burnout and expansion deformation damage of the annular dense-thin separation bluff body can be effectively solved, and the service life of a burner nozzle is prolonged.

Description

Technical Field

[0001] This utility model belongs to the field of burner technology, specifically relating to a pulverized coal burner nozzle structure. Background Technology

[0002] Existing swirl burners use a concentrator within the primary air duct, employing one or more stages, to create a concentrated distribution of pulverized coal gas flow. The applicant's prior patent application, CN210050797U, entitled "A Swirl Pulverized Coal Burner with Ultra-Low Emissions," proposes a method where an annular concentrated-dilute separation blunt body is installed at the nozzle end of the primary air duct to further separate the concentrated and dilute pulverized coal gas flow, achieving efficient concentrated-dilute combustion and thus reducing NOx emissions. Furthermore, after the pulverized coal gas flow passes through the annular concentrated-dilute separation blunt body, a significant negative pressure zone forms behind it, guiding the high-temperature flue gas backflow and effectively improving the ignition stability of the pulverized coal.

[0003] However, in actual engineering applications, the burner is in a high-temperature environment. Due to the high-temperature burning area at the burner nozzle, and the large temperature difference between the burner's fire-facing and fire-receiving surfaces, the front end of the annular rich-lean separation blunt body at the burner nozzle is prone to burn-out and expansion deformation damage. Utility Model Content

[0004] To address the aforementioned problems, this invention provides a pulverized coal burner nozzle structure that effectively solves the issues of high-temperature burnout and expansion deformation damage to the annular thick-thin separator, thereby improving the service life of the burner nozzle.

[0005] The embodiments of this utility model are achieved through the following technical solutions:

[0006] A pulverized coal burner nozzle structure includes a central air duct and an annular concentration-dilute separation blunt body disposed on the central air duct. The annular concentration-dilute separation blunt body includes a support and several high-temperature resistant splicing blocks. The support is fixed to the central air duct, and the high-temperature resistant splicing blocks are connected to the support.

[0007] In one embodiment of this utility model, the bracket is cylindrical with a smaller top and a larger bottom, and the smaller diameter end of the bracket is fixed to the central air duct.

[0008] In one embodiment of this utility model, the large-diameter end of the bracket is provided with a plurality of locking blocks, and the high-temperature resistant splicing block is matched with the locking blocks.

[0009] In one embodiment of this utility model, the high-temperature resistant splicing block and the clamping block are connected by bolts.

[0010] In one embodiment of this utility model, the high-temperature resistant splicing block is provided with a slot that matches the card block, and the high-temperature resistant splicing block is provided with a bolt hole, and the card block is provided with a threaded hole that matches the bolt hole.

[0011] In one embodiment of this utility model, the cross-section of the card block is trapezoidal, and the included angle α between the inner wall and the outer wall of the card block is 10 to 15°.

[0012] In one embodiment of this utility model, the cross-section of the high-temperature resistant splicing block is a right trapezoid, and the included angle β between the inner wall and the outer wall of the high-temperature resistant splicing block is 10 to 15°.

[0013] The technical solution of this utility model has at least the following advantages and beneficial effects:

[0014] This invention employs a ring-shaped thick-thin separation blunt body constructed by splicing high-temperature resistant splicing blocks and a support frame. This effectively solves the problems of high-temperature burnout and expansion deformation damage of the ring-shaped thick-thin separation blunt body, thereby improving the service life of the burner nozzle. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the nozzle structure of the pulverized coal burner in this utility model;

[0017] Figure 2 for Figure 1 A schematic diagram of the K-axis of the stent for the annular concentration-to-color separation blunt body;

[0018] Figure 3 for Figure 1 Schematic diagram of a scaffold for separating concentrations in a ring shape;

[0019] Figure 4 This is a first schematic diagram of the high-temperature resistant splicing block in this utility model;

[0020] Figure 5 This is a second schematic diagram of the high-temperature resistant splicing block in this utility model;

[0021] Figure 6 for Figure 1 A schematic diagram of the K-direction of the high-temperature resistant splicing block of the medium-ring concentrated and diluted separation blunt body.

[0022] Icons: 1-Central duct, 2-Annular concentrated / diluted separation blunt body, 21-Bracket, 211-Card block, 22-High temperature resistant splicing block, 221-Card slot, 222-Bolt hole, 3-Rib plate. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0025] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0026] In the description of this utility model, it should be noted that if terms such as "inner" or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model.

[0027] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "configure," 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 connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] Example

[0029] Please refer to Figure 1-6This embodiment provides a pulverized coal burner nozzle structure, including a central air duct 1 and an annular rich-lean separation blunt body 2 disposed on the central air duct 1. The annular rich-lean separation blunt body 2 includes a support 21 and several high-temperature resistant splicing blocks 22. The support 21 is fixed on the central air duct 1. Specifically, the support 21 is cylindrical with a smaller diameter at the top and a larger diameter at the bottom. The smaller diameter end of the support 21 is welded to the central air duct 1, and the larger diameter end of the support 21 is provided with several locking blocks 211. At the same time, a rib plate 3 is also provided between the support 21 and the central air duct 1. The cross-section of the locking block 211 is trapezoidal, and the included angle α between the inner wall and the outer wall of the locking block 211 is 10-15°. The high-temperature resistant splicing block 22 is connected to the bracket 21 via a locking block 211. The high-temperature resistant splicing block 22 is made of high-temperature resistant material and has a right-angled trapezoidal cross-section. The angle β between the inner and outer walls of the high-temperature resistant splicing block 22 is 10–15°. The high-temperature resistant splicing block 22 has a locking groove 221 that matches the locking block 211, and it also has bolt holes 222. The locking block 211 has threaded holes that match the bolt holes 222. During assembly, the locking groove 221 of the high-temperature resistant splicing block 22 is spliced ​​with the locking block 211, and then the bolt is passed through the bolt hole 222 and connected to the threaded hole until the bolt connects the high-temperature resistant splicing block 22 to the locking block 211. The locking groove 221 and the locking block 211 of the high-temperature resistant splicing block 22 use an interlocking structure to achieve splicing, preventing them from sliding and falling off.

[0030] This utility model uses a ring-shaped thick and thin separation blunt body 2 formed by splicing a high-temperature resistant splicing block 22 and a bracket 21, which can effectively solve the problems of high-temperature burnout and expansion deformation damage of the ring-shaped thick and thin separation blunt body 2, and improve the service life of the burner nozzle.

[0031] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A pulverized coal burner nozzle structure, comprising a central air duct and an annular concentration-lean separation blunt body disposed in the central air duct, characterized in that, The annular concentration-to-dilute separation blunt body includes a support frame and several high-temperature resistant splicing blocks. The support frame is fixed to the central air duct, and the high-temperature resistant splicing blocks are connected to the support frame.

2. The pulverized coal burner nozzle structure according to claim 1, characterized in that, The bracket is cylindrical in shape, with a smaller diameter at the top and a larger diameter at the bottom. The smaller diameter end of the bracket is fixed to the central air duct.

3. The pulverized coal burner nozzle structure according to claim 2, characterized in that, The large-diameter end of the bracket is provided with several locking blocks, and the high-temperature resistant splicing block is matched with the locking blocks.

4. The pulverized coal burner nozzle structure according to claim 3, characterized in that, The high-temperature resistant splicing block and the clamping block are connected by bolts.

5. The pulverized coal burner nozzle structure according to claim 4, characterized in that, The high-temperature resistant splicing block is provided with a slot that matches the card block, and the high-temperature resistant splicing block is provided with bolt holes, and the card block is provided with threaded holes that match the bolt holes.

6. The pulverized coal burner nozzle structure according to claim 3, characterized in that, The cross-section of the card block is trapezoidal, and the included angle α between the inner and outer walls of the card block is 10 to 15°.

7. The pulverized coal burner nozzle structure according to claim 1, characterized in that, The cross-section of the high-temperature resistant splicing block is a right-angled trapezoid, and the included angle β between the inner and outer walls of the high-temperature resistant splicing block is 10 to 15°.

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