A nozzle structure for a pulverized coal burner and a method of using the same

Abstract

The present application relates to the technical field of coal powder burner, and discloses a coal powder burner nozzle structure and a use method thereof, which comprises a shell, a primary air coal powder pipe is through and fixedly installed in the shell, a secondary air sleeve is sleeved and fixedly installed on the primary air coal powder pipe, a conveying pipe is communicated and fixedly installed at one end of the primary air coal powder pipe, a plurality of air inlet holes are annularly arranged on one side of the secondary air sleeve, an inner secondary annular air hole and an outer secondary annular air hole are arranged on the other side of the secondary air sleeve, and a fan is installed in the air inlet hole. The primary air coal powder pipe, the secondary air sleeve, the central air pipe, the air inlet hole, the fan, the inner annular part, the inner secondary annular air hole, the outer secondary annular air hole and the outer annular part are used in cooperation, so that a three-layer air duct form is formed around the flame, the contact probability of the coal powder and oxygen is increased, and the coal powder combustion effect is improved.

Description

Technical Field

[0001] This invention relates to the field of pulverized coal burner technology, specifically to a pulverized coal burner nozzle structure and its usage method. Background Technology

[0002] Pulverized coal burners are industrial devices used to mix pulverized coal with air and ensure stable combustion. They are mainly used in high-temperature industrial installations such as coal-fired boilers, cement kilns, and metallurgical furnaces. Their core function is to ensure that pulverized coal burns fully, stably, and efficiently in the furnace while controlling pollutant emissions. Pulverized coal burners have a specially designed multi-stage, multi-nozzle air supply and guiding structure, which can generate high-temperature vortices in pulverized coal in a short time. They have advantages such as complete combustion, high heat utilization rate, smoke and dust removal, high efficiency and energy saving, improved working conditions, and reduced labor intensity. They are ideal energy-saving and environmentally friendly products and are widely welcomed by customers.

[0003] The published patent document with announcement number CN223484212U discloses a pulverized coal burner nozzle structure. This published patent document uses an annular thick-thin separation blunt body composed of high-temperature resistant splicing blocks and brackets, which can effectively solve the problems of high-temperature burnout and expansion deformation damage of the annular thick-thin separation blunt body and improve the service life of the burner nozzle. However, the above-mentioned published patent document only has a primary air channel at the central air duct, which cannot realize a multi-layer air duct form around the flame, resulting in a reduced contact probability between pulverized coal and oxygen, thereby affecting the combustion effect of pulverized coal. Summary of the Invention

[0004] The purpose of this invention is to provide a pulverized coal burner nozzle structure and its usage method, which solves the problem mentioned in the background art that the inability to achieve a multi-layer air duct form around the flame leads to a reduced probability of contact between pulverized coal and oxygen, thereby affecting the pulverized coal combustion effect.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A pulverized coal burner nozzle structure includes a shell, a primary air pulverized coal pipe that runs through and is fixedly installed inside the shell, a secondary air assembly that is sleeved and fixedly installed on the primary air pulverized coal pipe, and a conveying pipe that is connected and fixedly installed at one end of the primary air pulverized coal pipe. A plurality of air inlets are arranged in a ring array on one side of the secondary air assembly, and an inner secondary annular air inlet and an outer secondary annular air inlet are arranged on the other side of the secondary air assembly. A fan is installed inside the air inlets. A matching inner annular component is fixedly connected inside the secondary air assembly. The inner secondary annular air inlet communicates with the inner edge of the secondary air assembly, and the outer secondary annular air inlet communicates with the outer edge of the secondary air assembly. A matching mounting seat is provided inside the conveying pipe. A central air duct that matches the primary air pulverized coal pipe is fixedly connected to one end of the mounting seat. The central air duct is located inside the primary air pulverized coal pipe, and a flame stabilizing blunt body is fixedly installed inside the central air duct.

[0006] A further improvement of the present invention is that the inner wall of the primary air pulverized coal pipe is provided with a plurality of impedance-reducing pulverized coal accumulation grooves in an annular array.

[0007] A further improvement of the present invention is that three outer ring parts are fixedly installed on one side of the secondary air kit.

[0008] A further improvement of the present invention is that the inner secondary annular air hole and the outer secondary annular air hole are located between the three outer annular components.

[0009] A further improvement of the present invention is that a primary air pulverized coal inlet is welded and connected to the conveying pipe.

[0010] A further improvement of the present invention is that matching shell covers are symmetrically arranged on the front and rear sides of the shell.

[0011] A further improvement of the present invention is that threaded holes are provided at the four corners of the front and rear sides of the shell cover, and internal hex bolts that match the threaded holes are threaded through and connected to the four corners of the shell cover.

[0012] A further improvement of the present invention is that the shell cover has several through holes.

[0013] A further improvement of the present invention is that the flame stabilizing blunt body is a V-shaped flame stabilizing blunt body.

[0014] A method of using a pulverized coal burner nozzle structure includes: Coal powder and primary air are conveyed to the conveying pipe and primary air coal powder pipe through the primary air coal powder inlet. The primary air coal powder pipe and the central air pipe form a primary air duct. The fan delivers outside air to the secondary air kit through the air inlet. The inner annular part makes the air entering the secondary air kit form inner air and outer air. The air is then discharged through the inner secondary annular air hole and the outer secondary annular air hole, forming a secondary air duct and a tertiary air duct. This creates a three-layer air duct around the flame, increasing the probability of contact between coal powder and oxygen. The flame stabilizer forms a stable recirculation zone in the high-speed airflow, achieving flame stability.

[0015] Compared with the prior art, the present invention has at least the following beneficial technical effects: This invention utilizes the coordinated use of a primary air pulverized coal pipe, a secondary air kit, a central air duct, an air inlet, a fan, an inner annular component, an inner secondary annular air inlet, an outer secondary annular air inlet, and an outer annular component to create a three-layer air duct around the flame, increasing the probability of contact between pulverized coal and oxygen, thereby enhancing the combustion effect of pulverized coal.

[0016] This invention achieves a stable and powerful flame by using a flame-stabilizing blunt body to form a stable recirculation zone in a high-speed airflow and by designing a drag-reducing powder accumulation groove to prevent slag blockage. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the structure of the shell and the primary air pulverized coal pipe of the present invention; Figure 3 This is a schematic diagram of the secondary air kit of the present invention; Figure 4 This is a cross-sectional view of the secondary air kit of the present invention from the front view; Figure 5 This is a schematic diagram of the mounting base and central air duct of the present invention.

[0019] Explanation of reference numerals in the attached figures: 1. Shell; 2. Primary air pulverized coal pipe; 3. Secondary air kit; 4. Conveying pipe; 5. Mounting base; 6. Primary air pulverized coal inlet; 7. Shell cover; 8. Through hole; 9. Socket head bolt; 10. Threaded hole; 11. Impedance-reducing dust accumulation groove; 12. Air inlet; 13. Fan; 14. Outer annular component; 15. Inner secondary annular air hole; 16. Outer secondary annular air hole; 17. Inner annular component; 18. Central air duct; 19. Flame stabilizer. Detailed Implementation

[0020] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0021] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this 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 this invention.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0023] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0024] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0025] It should be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0026] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0027] The accompanying drawings illustrate various structural schematic diagrams according to embodiments disclosed in this invention. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0028] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0029] Please see Figure 1-5This invention provides a pulverized coal burner nozzle structure, including a shell 1. A primary air pulverized coal pipe 2 is installed through and fixedly mounted inside the shell 1. A secondary air assembly 3 is sleeved and fixedly mounted on the primary air pulverized coal pipe 2. One end of the primary air pulverized coal pipe 2 is connected to and fixedly mounted with a conveying pipe 4. A plurality of air inlets 12 are arranged in a ring array on one side of the secondary air assembly 3, and an inner secondary annular air hole 15 and an outer secondary annular air hole 16 are arranged on the other side of the secondary air assembly 3. A fan 13 is installed inside the air inlets 12. A matching inner annular component 17 is fixedly connected inside the secondary air assembly 3. The inner secondary annular air hole 15 is connected to the inner edge of the secondary air assembly 3, and the outer secondary annular air hole 16 is connected to the outer edge of the secondary air assembly 3. A matching mounting seat 5 is provided inside the conveying pipe 4. One end of the mounting seat 5 is fixedly connected to a central air duct 18 that matches the primary air pulverized coal pipe 2. The central air duct 18 is located inside the primary air pulverized coal pipe 2, and a flame stabilizer 19 is fixedly installed inside the central air duct 18.

[0030] In this technical solution, a primary air duct is formed between the primary air pulverized coal pipe 2 and the central air duct 18. The fan 13 delivers outside air to the secondary air kit 3 through the air inlet 12. The inner annular component 17 causes the air entering the secondary air kit 3 to form inner and outer air. The air is then discharged through the inner secondary annular air hole 15 and the outer secondary annular air hole 16, forming a secondary and tertiary air duct. This creates a three-layer air duct around the flame, increasing the probability of contact between pulverized coal and oxygen, thereby increasing the combustion effect of pulverized coal. Furthermore, the flame stabilizer 19 forms a stable recirculation zone in the high-speed airflow, achieving flame stability.

[0031] In some technical solutions, such as Figure 2 As shown, the inner wall of the primary air pulverized coal pipe 2 is provided with a number of impedance-reducing pulverized coal accumulation grooves 11 in a ring array.

[0032] When in use, the design of the impedance-reducing powder accumulation groove 11 achieves the anti-clogging effect, thereby ensuring a stable and powerful flame.

[0033] In some technical solutions, such as Figure 3-4 As shown, three outer annular components 14 are fixedly installed on one side of the secondary air kit 3, and the inner secondary annular air hole 15 and the outer secondary annular air hole 16 are located between the three outer annular components 14.

[0034] During use, the three outer annular parts 14, along with the inner secondary annular air holes 15 and the outer secondary annular air holes 16, ensure the stability of the airflow from the secondary and tertiary air ducts.

[0035] In some technical solutions, such as Figure 1-2 As shown, a primary air pulverized coal inlet 6 is welded and connected to the conveying pipe 4.

[0036] In use, coal powder and primary air can be conveyed to conveying pipe 4 and primary air coal powder pipe 2 through primary air coal powder inlet 6.

[0037] In some technical solutions, such as Figure 1-2 As shown, the front and rear sides of the housing 1 are symmetrically provided with matching housing covers 7, and threaded holes 10 are provided at the four corners of the front and rear sides of the housing cover 7. The four corners of the housing cover 7 are connected with internal hex bolts 9 that match the threaded holes 10.

[0038] In use, the housing cover 7 can be installed by rotating each of the internal hex bolts 9 into the corresponding threaded holes 10, which facilitates the installation and removal of the housing cover 7, thereby making it convenient to inspect the inside of the burner nozzle structure.

[0039] In some technical solutions, such as Figure 1 As shown, the cover 7 has several through holes 8.

[0040] During use, multiple through holes 8 ensure that air can pass through the cover 7 and enter the secondary air kit 3.

[0041] Working principle: During use, coal powder and primary air are conveyed to the conveying pipe 4 and the primary air coal powder pipe 2 through the primary air coal powder inlet 6. The primary air coal powder pipe 2 and the central air pipe 18 form a primary air duct. The fan 13 delivers outside air to the secondary air kit 3 through the air inlet 12. The inner annular part 17 makes the air entering the secondary air kit 3 form inner air and outer air. Then, the air is discharged through the inner secondary annular air hole 15 and the outer secondary annular air hole 16, forming a secondary air duct and a tertiary air duct. This forms a three-layer air duct around the flame, increasing the contact probability between coal powder and oxygen. The flame stabilizer bluff body 19 forms a stable backflow zone in the high-speed airflow, achieving flame stability. The design of the impedance-reducing coal accumulation groove 11 achieves the anti-clogging effect, thereby ensuring a stable and strong flame.

[0042] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the 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 illustrative and non-limiting in all respects, 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 scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0043] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A pulverized coal burner nozzle structure, comprising a shell (1), characterized in that, A primary air pulverized coal pipe (2) is installed through and fixedly mounted inside the housing (1). A secondary air assembly (3) is fitted and fixedly mounted on the primary air pulverized coal pipe (2). One end of the primary air pulverized coal pipe (2) is connected to and fixedly mounted with a conveying pipe (4). A number of air inlets (12) are arranged in a ring array on one side of the secondary air assembly (3), and an inner secondary annular air inlet (15) and an outer secondary annular air inlet (16) are arranged on the other side of the secondary air assembly (3). A fan (13) is installed inside the air inlet (12). The secondary air assembly (3) is fixed inside. A matching inner annular part (17) is connected. The inner secondary annular air hole (15) is connected to the inner edge of the secondary air kit (3). The outer secondary annular air hole (16) is connected to the outer edge of the secondary air kit (3). A matching mounting seat (5) is provided inside the conveying pipe (4). One end of the mounting seat (5) is fixedly connected to a central air duct (18) that matches the primary air pulverized coal pipe (2). The central air duct (18) is located inside the primary air pulverized coal pipe (2), and a flame stabilizing blunt body (19) is fixedly installed inside the central air duct (18).

2. The pulverized coal burner nozzle structure according to claim 1, characterized in that, The inner wall of the primary air pulverized coal pipe (2) is provided with a number of impedance-reducing pulverized coal accumulation grooves (11).

3. The pulverized coal burner nozzle structure according to claim 1, characterized in that, Three outer ring parts (14) are fixedly installed on one side of the secondary air kit (3).

4. The pulverized coal burner nozzle structure according to claim 3, characterized in that, The inner secondary annular air hole (15) and the outer secondary annular air hole (16) are located between the three outer annular components (14).

5. The pulverized coal burner nozzle structure according to claim 1, characterized in that, The conveying pipe (4) is welded to and connected to a primary air pulverized coal inlet (6).

6. The pulverized coal burner nozzle structure according to claim 1, characterized in that, The front and rear sides of the housing (1) are symmetrically provided with matching shell covers (7).

7. The pulverized coal burner nozzle structure according to claim 6, characterized in that, The cover (7) has threaded holes (10) at the four corners on the front and rear sides. The cover (7) has internal hex bolts (9) that are threaded through and connected to the four corners of the cover (7) and match the threaded holes (10).

8. The pulverized coal burner nozzle structure according to claim 7, characterized in that, The shell cover (7) has several through holes (8).

9. The pulverized coal burner nozzle structure according to claim 1, characterized in that, The flame stabilizer (19) is a V-shaped flame stabilizer.

10. A method of using the nozzle structure of a pulverized coal burner according to any one of claims 1 to 9, characterized in that, include: Coal powder and primary air are conveyed to the conveying pipe (4) and the primary air coal powder pipe (2) through the primary air coal powder inlet (6). A primary air duct is formed between the primary air coal powder pipe (2) and the central air duct (18). The fan (13) delivers outside air to the secondary air kit (3) through the air inlet (12). The inner annular part (17) makes the air entering the secondary air kit (3) form inner air and outer air. The air is then discharged through the inner secondary annular air hole (15) and the outer secondary annular air hole (16), forming a secondary air duct and a tertiary air duct. This forms a three-layer air duct around the flame, increasing the contact probability between coal powder and oxygen. A stable recirculation zone is formed in the high-speed airflow through the flame stabilizer (19), thus stabilizing the flame.

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