Adjustable coal dust burner

Abstract

The present application relates to the field of boiler combustion technology of thermal power plant and discloses an adjustable pulverized coal burner, which comprises an outer cylinder, an air inlet pipe, an inner cylinder assembly and a flame stabilizer, the air inlet pipe is used for guiding the mixed gas flow carrying the pulverized coal into the outer cylinder, the inner cylinder assembly is arranged in the inner part of the outer cylinder, an annular channel is formed between the inner cylinder assembly and the outer cylinder, the inner cylinder assembly is used for dividing the mixed gas flow into a first-stage gas flow flowing through the inner cylinder assembly and a second-stage gas flow flowing through the annular channel, the flame stabilizer is arranged on the air inlet pipe, the working end of the flame stabilizer is located in the inner part of the air inlet pipe and faces the inner cylinder assembly, and the working end is used for spraying the flame and igniting the first-stage gas flow and the second-stage gas flow in sequence, wherein at least one of the flame stabilizer and the inner cylinder assembly is movable to adjust the relative distance between the two to realize the flow adjustment of the first-stage gas flow and the second-stage gas flow. The adjustable pulverized coal burner of the present application embodiment can realize quick ignition and stable and sufficient combustion by adapting to different coal types.

Description

Technical Field

[0001] This invention belongs to the field of boiler combustion technology in thermal power plants, and specifically relates to an adjustable pulverized coal burner. Background Technology

[0002] To address the challenges of pulverized coal ignition, stable combustion, and complete combustion during boiler start-up and low-load operation due to low furnace temperatures, existing technologies include pulverized coal burner systems that use high-concentration pulverized coal to form a stable central flame, igniting the main pulverized coal gas flow for combustion support. However, because the structural dimensions of pulverized coal burner systems are larger than traditional plasma igniters or micro-oil igniters, traditional burners are not compatible with them. Furthermore, ensuring gradual ignition of pulverized coal to reduce ignition difficulty, adapting to different types of pulverized coal, and achieving a reasonable internal pressure drop within the burner are also problems that need to be solved. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of the present invention provide an adjustable pulverized coal burner that can adapt to different coal types to achieve rapid ignition and stable, complete combustion.

[0004] An adjustable pulverized coal burner according to an embodiment of the present invention includes an outer cylinder, an air inlet pipe, an inner cylinder assembly, and a flame stabilizer. The air inlet pipe has an inlet end and an outlet end, and the outlet end is connected to the outer cylinder. The air inlet pipe is used to introduce a mixed airflow carrying pulverized coal and deliver it into the outer cylinder. The inner cylinder assembly is disposed inside the outer cylinder, and an annular channel is formed between the inner cylinder assembly and the outer cylinder. The inner cylinder assembly is used to split the mixed airflow into a primary airflow flowing through the inner cylinder assembly and a secondary airflow flowing through the annular channel. The flame stabilizer is disposed on the air inlet pipe and has a working end. The working end is located inside the air inlet pipe and faces the inner cylinder assembly. The working end is used to eject a flame and ignite the primary airflow and the secondary airflow sequentially. At least one of the flame stabilizer and the inner cylinder assembly can be moved to adjust the relative distance between them to achieve flow rate regulation of the primary airflow and the secondary airflow.

[0005] The adjustable pulverized coal burner of this invention divides the mixed airflow in the inlet pipe into a primary airflow and a secondary airflow, enabling the two airflows to be ignited sequentially. This reduces the heat required for a single ignition and lowers the difficulty of ignition by using a batch ignition method. Stable combustion is achieved, and unburned combustible gases in the secondary airflow can continue to burn with the secondary airflow, ensuring complete combustion. Therefore, it can be easily ignited and achieve fully stable combustion under startup and low-load conditions. Furthermore, in this embodiment, the secondary airflow in the annular channel can envelop the primary airflow burning in the inner cylinder, achieving air-fire envelopment. This preheating of the secondary airflow also controls the combustion process, preventing risks such as high-temperature burnout, ash accumulation, and coking of the burner. Additionally, this embodiment adjusts the ratio of the primary and secondary airflows by moving the burner or the inner cylinder assembly. This allows for the reasonable allocation of the primary airflow proportion according to the pulverized coal conditions, adapting to various types of pulverized coal and achieving ignition and fully stable combustion.

[0006] In some embodiments, the inner cylinder assembly includes a first straight cylinder section and a flow guide section, the first straight cylinder section and the flow guide section are connected, the flow guide section is a tapered sleeve with the larger diameter end facing the working end, the working end can be placed inside the flow guide section and is spaced apart from the inner wall surface of the flow guide section.

[0007] In some embodiments, the adjustable pulverized coal burner further includes a first connecting assembly for mounting the flame stabilizer, and the flame stabilizer is movable to adjust the relative distance between the flame stabilizer and the inner cylinder assembly.

[0008] In some embodiments, the first connecting assembly includes a first sleeve and a clamp. The first sleeve is connected to the air inlet pipe, and the flame stabilizer is installed inside the first sleeve and is movable along the axial direction of the first sleeve. The clamp is disposed on the outer wall surface of the first sleeve and the flame stabilizer and is used to connect the first sleeve and the flame stabilizer. The first sleeve has a first protrusion at one end connected to the clamp, and the flame stabilizer has a second protrusion at one end connected to the clamp. A limiting groove is provided on the inner wall surface of the clamp, and the first protrusion and the second protrusion can be placed within the limiting groove to keep the relative positions of the flame stabilizer and the first sleeve unchanged.

[0009] In some embodiments, the adjustable pulverized coal burner further includes a second connecting assembly for mounting the inner cylinder assembly, and the inner cylinder assembly is movable to adjust the relative distance between the inner cylinder assembly and the burner stabilizer.

[0010] In some embodiments, the second connecting component includes a connecting portion for connecting the inner cylinder assembly and the outer cylinder, wherein the connecting portion includes at least one of a connecting rod, a bolt, and a connecting plate.

[0011] In some embodiments, the second connecting assembly includes a guide rod, one end of which is connected to the inner cylinder assembly, and the other end of which passes through the side wall of the air inlet pipe and is positioned outside the air inlet pipe.

[0012] In some embodiments, the second connecting assembly further includes a second sleeve, a sealing component, and a collar. The second sleeve is mounted on the side wall of the air inlet pipe. The guide rod passes through the second sleeve and is movable along the axial direction of the second sleeve. The sealing component is sleeved on the guide rod and is movable along the guide rod. The sealing component is used to seal the connection between the guide rod and the second sleeve. The collar is sleeved on the first sleeve. The other end of the plurality of guide rods is connected to the collar. The collar is used to drive the plurality of guide rods to move synchronously.

[0013] In some embodiments, the adjustable pulverized coal burner further includes a first tapered section, a second straight section, and a second tapered section. The first tapered section is disposed between the air inlet end and the outer cylinder and serves to connect the air inlet end and the outer cylinder. The cross-sectional area of ​​the first tapered section gradually decreases along the direction from the air inlet end toward the outer cylinder. The second straight section communicates with the air inlet end and serves to connect to the power plant's supply assembly to provide the mixed airflow to the air inlet pipe. The second tapered section is disposed between the second straight section and the air inlet end and serves to connect the second straight section and the air inlet end. The cross-sectional area of ​​the second tapered section gradually decreases along the direction from the air inlet end toward the second straight section.

[0014] In some embodiments, the air inlet pipe is a bend.

[0015] In some embodiments, the flame stabilizer is fixed to the side wall of the air inlet pipe, and the working end has an axis that coincides with the axis of the first straight section.

[0016] In some embodiments, the flame stabilizer includes at least one of the following: a pulverized coal flame stabilizer, an oil flame stabilizer, a gas flame stabilizer, a plasma igniter, and a micro-oil igniter.

[0017] The adjustable pulverized coal burner of this invention, through its ingenious structural design, utilizes the installation method of the pulverized coal stabilizer and the layout of the inner cylinder assembly to achieve adjustment of the primary airflow ratio. The primary airflow ratio can be adjusted from low to high according to the ignition difficulty of the pulverized coal, progressing from difficult to easy. Combined with actual testing and software simulation, detailed parameters such as the primary airflow ratio are designed to achieve easy ignition of various types of pulverized coal, maintain sufficient and stable combustion, enhance pulverized coal ignition, and simultaneously reduce nitrogen oxide emissions. Furthermore, this embodiment optimizes the pressure drop within the burner through the bend design of the air inlet pipe, as well as the design of parameters such as the inner cylinder assembly, outer cylinder, stabilizer, first tapering section, and their spacing, achieving optimal flow conditions and optimal adjustment of the primary airflow ratio. Attached Figure Description

[0018] Figure 1 This is a perspective view of one embodiment of the present invention.

[0019] Figure 2 This is the present invention. Figure 1 Front view sectional view.

[0020] Figure 3 This is a perspective view of the first connecting component of the present invention.

[0021] Figure 4 This is the present invention. Figure 1 A schematic diagram of airflow.

[0022] Figure 5 This is a perspective view of another embodiment of the present invention.

[0023] Figure 6 This is the present invention. Figure 5 Front view sectional view.

[0024] Figure 7 This is a perspective view of the second connecting component of the present invention.

[0025] Figure 8 This is the present invention. Figure 5 A schematic diagram of airflow.

[0026] Figure 9 This is a schematic diagram showing the dimensions of the present invention.

[0027] Figure label:

[0028] 1. Outer cylinder;

[0029] 2. Air inlet duct;

[0030] 3. Inner cylinder assembly; 301. First straight cylinder section; 302. Guide section;

[0031] 4. Flame stabilizer; 401. Working end;

[0032] 5. Mixed airflow;

[0033] 6. Primary airflow;

[0034] 7. Secondary airflow;

[0035] 8. First connecting assembly; 801. First sleeve; 802. Clamp; 803. First protrusion; 804. Second protrusion; 805. Limiting groove;

[0036] 9. Second connecting assembly; 901. Connecting part; 902. Guide rod; 903. Second sleeve; 904. Sealing component; 905. Collar;

[0037] 10. First tapering section;

[0038] 11. Second straight section;

[0039] 12. Second tapering section. Detailed Implementation

[0040] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0041] like Figures 1-7 As shown, the multi-stage pulverized coal burner of this embodiment includes an outer cylinder 1, an air inlet pipe 2, an inner cylinder assembly 3, and a flame stabilizer 4. The air inlet pipe 2 has an air inlet end and an air outlet end, and the air outlet end is connected to the outer cylinder 1. The air inlet pipe 2 is used to introduce a mixed airflow 5 carrying pulverized coal and deliver it into the outer cylinder 1. The inner cylinder assembly 3 is located inside the outer cylinder 1, and an annular channel is formed between the inner cylinder assembly 3 and the outer cylinder 1. The inner cylinder assembly 3 is used to split the mixed airflow 5 into a primary airflow 6 flowing through the inner cylinder assembly 3 and a secondary airflow 7 flowing through the annular channel. The flame stabilizer 4 is located on the air inlet pipe 2 and has a working end 401. The working end 401 is located inside the air inlet pipe 2 and faces the inner cylinder assembly 3. The working end 401 is used to spray a flame and ignite the primary airflow 6 and the secondary airflow 7 in sequence. At least one of the flame stabilizer 4 and the inner cylinder assembly 3 can be moved to adjust the relative distance between them to achieve flow rate regulation of the primary airflow 6 and the secondary airflow 7.

[0042] The adjustable pulverized coal burner of this embodiment divides the mixed airflow 5 in the air inlet pipe 2 into a primary airflow 6 and a secondary airflow 7, enabling the two airflows to be ignited sequentially. This reduces the heat required for a single ignition and lowers the difficulty of ignition by igniting in batches, achieving stable combustion. Furthermore, unburned combustible gases in the airflow can continue to burn with the secondary airflow 7, achieving complete combustion. Therefore, it can be easily ignited and achieve fully stable combustion under startup and low-load conditions. In addition, in this embodiment, the secondary airflow 7 in the annular channel can envelop the primary airflow 6 burning in the inner cylinder, achieving air-fire envelopment. This preheating of the secondary airflow 7 also controls the combustion process, preventing risks such as high-temperature burnout, ash accumulation, and coking of the burner. Moreover, this embodiment adjusts the ratio of the primary airflow 6 and the secondary airflow 7 by moving the burner 4 or the inner cylinder assembly. This allows for the reasonable allocation of the proportion of the primary airflow 6 according to the pulverized coal conditions, adapting to various types of pulverized coal and achieving ignition and fully stable combustion.

[0043] Specifically, for coal types with easy ignition (ignition temperature ≤800℃), the distance between the flame stabilizer 4 and the inner cylinder assembly 3 is reduced, as shown in the attached figure. Figure 4 4.a and Appendix Figure 8 As shown in Figure 8.b, the area of ​​the inner cylinder assembly 3 blocked by the flame stabilizer 4 increases, and the actual effective area of ​​the inner cylinder assembly 3 decreases, thereby reducing the flow rate of the primary airflow 6 and preventing high-temperature coking and burn-off. For coal types with difficult ignition (ignition temperature > 800℃), the opposite is true: by increasing the distance between the flame stabilizer 4 and the inner cylinder assembly 3, the actual effective area of ​​the inner cylinder assembly 3 increases, as shown in the attached figure. Figure 4 4.b and Appendix Figure 8 As shown in Figure 8.a, increasing the flow rate of the primary gas stream 6 increases the volatile matter concentration per unit volume, which is beneficial for pulverized coal ignition and stable combustion. This solves the problems of difficult pulverized coal ignition, stable combustion, and complete combustion, as well as the difficulty of stable combustion at low boiler loads.

[0044] In this embodiment of the adjustable pulverized coal burner, the air inlet end of the air inlet pipe 2 is connected to the pulverized coal supply unit of the power plant, such as a pulverizer or coal bunker. The pulverized coal output from the pulverizer or coal bunker is directly transported with the hot primary air through the primary air duct to the boiler's air inlet pipe 2, forming a mixed airflow 5. A portion of this mixed airflow enters the burner stabilizer 4 for pre-combustion. The pulverized coal flowing through the burner stabilizer 4 is ignited by the ignition device within the burner stabilizer 4 and kept burning continuously. Subsequently, the mixed airflow 5 enters the air inlet pipe 2 and is split into a primary airflow 6 and a secondary airflow 7. The working end 401 of the burner stabilizer 4, i.e., the flame outlet end, can eject a flame, which is directly facing the primary airflow 6, thus igniting the primary airflow 6. The ignited primary airflow 6 continues to be transported and mixed with the secondary airflow 7, igniting the secondary airflow 7. This achieves a gradual ignition effect. By igniting in batches, the heat required for a single ignition is reduced, and the unburned combustible gas in the mixed airflow 5 can mix with the oxygen in the secondary airflow 7 for secondary combustion, achieving complete combustion. Furthermore, the proportion of primary airflow 6 can be adjusted from high to low according to the difficulty of igniting pulverized coal, and detailed parameter designs such as the proportion of primary airflow 6 can be planned by combining actual tests and software simulations. Ultimately, this will enable easy ignition of various types of pulverized coal, maintain sufficient and stable combustion, enhance pulverized coal ignition, and reduce nitrogen content.

[0045] In some embodiments, the inner cylinder assembly 3 includes a first straight cylindrical section 301 and a flow guide section 302, which are connected. The flow guide section 302 is a tapered sleeve with the larger diameter end facing the working end 401. The working end 401 can be placed inside the flow guide section 302 and is spaced apart from the inner wall surface of the flow guide section 302.

[0046] In some specific embodiments, the working end 401 is a tapered sleeve, and the inclined surface of the working end 401 is aligned with the inclined surface of the guide section 302, or the inclined surface of the working end 401 is parallel to the inclined surface of the guide section 302.

[0047] The adjustable pulverized coal burner of this embodiment of the invention comprises an inner cylinder assembly 3 consisting of a first straight cylindrical section 301 and a guide section 302. The guide section 302 is a conical sleeve with the same shape as the working end 401. On the one hand, the guide section 302 can increase the flow rate of the primary airflow 6 entering the inner cylinder assembly 3. On the other hand, when the burner stabilizer 4 and the inner cylinder assembly 3 move relative to each other, the distance between the outer surface of the working end 401 and the inner surface of the guide section 302 can be adjusted through the cooperation of the inclined surfaces. By adjusting this distance, the flow rate of the primary airflow 6 can be regulated.

[0048] In some embodiments, the adjustable pulverized coal burner further includes a first connecting assembly 8, which is used to install a flame stabilizer 4 and the flame stabilizer 4 is movable to adjust the relative distance between the flame stabilizer 4 and the inner cylinder assembly 3.

[0049] Specifically, the first connecting component 8 can be a sliding connection or a fixed connection. When the first connecting component 8 and the flame stabilizer 4 are fixed, the distance between them can be adjusted by adjusting the movement of the inner cylinder component 3.

[0050] In some embodiments, the first connecting assembly 8 includes a first sleeve 801, on which a clamping screw can be provided to achieve stepless adjustment and limiting of the position of the flame stabilizer 4. This satisfies the requirement for stepless adjustment of the distance between the flame stabilizer 4 and the inner cylinder assembly 3, providing more adjustment methods.

[0051] In some embodiments, the first connecting assembly 8 includes a first sleeve 801 and a clamp 802. The first sleeve 801 is connected to the air inlet pipe 2. The flame stabilizer 4 is installed inside the first sleeve 801 and can move along the axial direction of the first sleeve 801. The clamp 802 is provided on the outer wall surface of the first sleeve 801 and the flame stabilizer 4 and is used to connect the first sleeve 801 and the flame stabilizer 4. The first sleeve 801 is provided with a first protrusion 803 at one end connected to the clamp 802, and the flame stabilizer 4 is provided with a second protrusion 804 at one end connected to the clamp 802. The inner wall surface of the clamp 802 is provided with a limiting groove 805. The first protrusion 803 and the second protrusion 804 can be placed in the limiting groove 805 so that the relative position of the flame stabilizer 4 and the first sleeve 801 remains unchanged.

[0052] In some specific embodiments, the first protrusion 803 and the second protrusion 804 are both flanges, and the limiting groove 805 is an annular groove, and there are multiple limiting grooves 805.

[0053] The adjustable pulverized coal burner of this invention is shown in the appendix. Figure 2 As shown, the flame stabilizer 4 is installed inside the first sleeve 801, and the flame stabilizer 4 and the outer wall surface of the first sleeve 801 are in a clearance fit or a tight fit. The flame stabilizer 4 can move along the axial direction of the first sleeve 801, thereby adjusting the position of the flame stabilizer 4. At this time, the flame stabilizer 4 has two adjustment positions. When the first protrusion 803 and the second protrusion 804 are tightly fitted, the clamp 802 is not needed; the first protrusion 803 and the second protrusion 804 can be directly connected together. When it is necessary to increase the distance between the inner cylinder assembly 3 and the flame stabilizer 4, after adjusting the distance, the clamp 802 is used to place the first protrusion 803 and the second protrusion 804 into different annular grooves, and then the clamp 802 is fixed. In this way, the distance between the inner cylinder assembly 3 and the flame stabilizer 4 can be adjusted in stages, and multiple different distance levels can be preset, thus facilitating quick on-site adjustment.

[0054] In some embodiments, the adjustable pulverized coal burner further includes a second connecting assembly 9, which is used to install the inner cylinder assembly 3 and the inner cylinder assembly 3 is movable to adjust the relative distance between the inner cylinder assembly 3 and the burner stabilizer 4.

[0055] In some embodiments, the second connecting assembly 9 includes a connecting portion 901 for connecting the inner cylinder assembly 3 and the outer cylinder 1, wherein the connecting portion 901 includes at least one of a connecting rod, a bolt, and a connecting plate.

[0056] The adjustable pulverized coal burner of this invention is shown in the appendix. Figure 2 The air inlet pipe 2 and the inner cylinder assembly 3 are fixedly connected by a connecting plate, with the connecting plate facing the airflow direction to avoid obstructing the airflow. At this time, the position of the inner cylinder assembly 3 cannot be adjusted; the proportion of the primary airflow 6 is adjusted by adjusting the position of the flame stabilizer 4.

[0057] In some embodiments, the second connecting component 9 includes a guide rod 902, one end of which is connected to the inner cylinder component 3, and the other end of which passes through the side wall of the air inlet pipe 2 and is placed outside the air inlet pipe 2.

[0058] As attached Figure 5-7 As shown, multiple guide rods 902 are installed on the air inlet pipe 2. One end of each guide rod 902 is placed inside the air inlet pipe 2 and connected to the inner cylinder assembly 3 to support and move the inner cylinder assembly 3. By pulling the guide rods 902, the position of the inner cylinder assembly 3 can be adjusted, thereby adjusting the distance between the inner cylinder assembly 3 and the flame stabilizer 4.

[0059] In some embodiments, the second connecting assembly 9 further includes a second sleeve 903, a sealing component 904, and a collar 905. The second sleeve 903 is mounted on the side wall of the air inlet pipe 2. The guide rod 902 passes through the second sleeve 903 and can move along the axial direction of the second sleeve 903. The sealing component 904 is sleeved on the guide rod 902 and can move along the guide rod 902. The sealing component 904 is used to seal the connection between the guide rod 902 and the second sleeve 903. The collar 905 is sleeved on the first sleeve 801. The other end of the plurality of guide rods 902 is connected to the collar 905. The collar 905 is used to drive the plurality of guide rods 902 to move synchronously.

[0060] In some specific embodiments, the sealing component 904 and the second sleeve 903 are connected by threads. The sealing component 904 and the guide rod 902 are in a tight fit or an interference fit, which can realize the movement of the sealing component 904 relative to the guide rod 902, and can also realize the stable connection between the sealing component 904 and the guide rod 902 when stationary.

[0061] As attached Figure 8As shown, the adjustable pulverized coal burner of this embodiment of the invention is connected to multiple guide rods 902 via a collar 905 to improve the support stability of the inner cylinder assembly 3. Furthermore, during movement, the multiple guide rods 902 can move synchronously, achieving accurate movement of the inner cylinder assembly 3. In this embodiment, the guide rods 902 and the second sleeve 903 are in a clearance fit to facilitate movement. Once the guide rods 902 are in position, they can be connected to the second sleeve 903 via a sealing component 904 to fix their position. The sealing component 904 has a sealing ring inside. By moving the sealing component 904 and connecting it to the second sleeve 903, the guide rods 902 can be fixed, and the connection between the guide rods 902 and the second sleeve 903 can be sealed.

[0062] In some embodiments, the adjustable pulverized coal burner further includes a first tapered section 10, a second straight section 11, and a second tapered section 12. The first tapered section 10 is disposed between the air inlet end and the outer cylinder 1 and is used to connect the air inlet end and the outer cylinder 1. The cross-sectional area of ​​the first tapered section 10 gradually decreases along the direction from the air inlet end toward the outer cylinder 1. The second straight section 11 is connected to the air inlet end and is used to connect the power plant's supply assembly to provide mixed airflow 5 to the air inlet pipe 2. The second tapered section 12 is disposed between the second straight section 11 and the air inlet end and is used to connect the second straight section 11 and the air inlet end. The cross-sectional area of ​​the second tapered section 12 gradually decreases along the direction from the air inlet end toward the second straight section 11.

[0063] In some specific embodiments, the slope of the first tapering section 10 is parallel to the slope of the guide section 302 or the working end 401. This allows the mixed airflow 5 to smoothly enter the annular channel or inner cylinder assembly 3 along the first tapering section 10.

[0064] In some specific embodiments, the projected lengths of the first tapering section 10, the guide section 302, and the working end 401 in the axial direction of the outer cylinder 1 are equal.

[0065] In some embodiments, the air inlet pipe 2 is a bend. In the adjustable pulverized coal burner of this embodiment, the size of the air inlet pipe 2 is larger than the size of the flame stabilizer 4. After the flame stabilizer 4 is installed in the air inlet pipe 2, there is still enough space in the air inlet pipe 2 for the flow of pulverized coal airflow. Furthermore, the bend in the air inlet pipe 2 can reduce the resistance to the flow of the mixed airflow 5 in the air inlet pipe 2, improve the flowability, and prevent pulverized coal residue from remaining in the air inlet pipe 2.

[0066] In some embodiments, the flame stabilizer 4 is fixed to the side wall of the air inlet pipe 2, and the working end 401 has an axis that coincides with the axis of the first cylindrical section 301. The adjustable pulverized coal burner of this embodiment, through its axis coincidence design, enables the flame ejected from the flame stabilizer 4 to be directly aligned with the inner cylinder assembly 3, thereby completely igniting the pulverized coal within the inner cylinder assembly 3.

[0067] In some embodiments, the flow rate of the mixed airflow 5 is Q, the flow rate of the primary airflow 6 is R, and the inner diameter of the first cylindrical section 301 is D. t1 The inner diameter of the large end of the guide section 302 is D. t2 The projected length of the guide section 302 on the axis of the outer cylinder 1 is L. tJS The inner diameter of the outlet is D. tw The inner diameter of the large end of the working end 401 is D. WH1 The inner diameter of the small end of the working terminal 401 is D. WH2 The projected length of the working end 401 along the axial direction of the outer cylinder 1 is L. WH The inner diameter of the working end 401 in the longitudinal section along the larger end of the guide section 302 is D. cWH1 The distance between the large end of the working end 401 and the large end of the guide section 302 is D. y The wall thickness of the adjustable pulverized coal burner 4 is d. w .

[0068] When the large end of the working end 401 is flush with the large end of the guide section 302, as shown in the attached figure. Figure 6 As shown, (i.e.) When ), R is approximately:

[0069] .

[0070] Specifically, when the large end of the working end 401 is not flush with the large end of the guide section 302, and the large end of the working end 401 is placed inside or outside the guide section 302, as shown in the attached figure. Figure 4 As shown, at this time:

[0071]

[0072] .

[0073] The adjustable pulverized coal burner of this invention can, through the above formula, select the design parameters such as the inner cylinder assembly 3, outer cylinder 1, flame stabilizer 4, first tapering section 10, and the spacing between them by computer calculation or software simulation. This can optimize the pressure drop inside the entire burner to achieve the best flow state and the optimal parameter adjustment of the proportion of the primary airflow 6, thereby meeting the needs of various coal types.

[0074] 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 are not intended to 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.

[0075] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0076] 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 connection that allows communication between them; 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0077] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0078] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0079] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. An adjustable pulverized coal burner, characterized in that, include: Outer cylinder (1); Air inlet pipe (2), the air inlet pipe (2) has an air inlet end and an air outlet end, the air outlet end is connected to the outer cylinder (1), the air inlet pipe (2) is used to introduce the mixed airflow (5) carrying coal powder and transport it into the outer cylinder (1); Inner cylinder assembly (3), the inner cylinder assembly (3) is disposed inside the outer cylinder body (1), an annular channel is formed between the inner cylinder assembly (3) and the outer cylinder body (1), the inner cylinder assembly (3) is used to split the mixed airflow (5) into a primary airflow (6) flowing through the inner cylinder assembly (3) and a secondary airflow (7) flowing through the annular channel. A flame stabilizer (4) is provided on the air inlet pipe (2). The flame stabilizer (4) has a working end (401). The working end (401) is located inside the air inlet pipe (2) and faces the inner cylinder assembly (3). The working end (401) is used to spray out flames and ignite the primary airflow (6) and the secondary airflow (7) in sequence. Among them, at least one of the flame stabilizer (4) and the inner cylinder assembly (3) can be moved to adjust the relative distance between them to achieve flow regulation of the primary airflow (6) and the secondary airflow (7); The inner cylinder assembly (3) includes a first straight cylinder section (301) and a flow guide section (302). The first straight cylinder section (301) and the flow guide section (302) are connected. The flow guide section (302) is a conical sleeve with the larger diameter end facing the working end (401). The working end (401) can be placed inside the flow guide section (302) and is spaced from the inner wall surface of the flow guide section (302). A first connecting component (8) is used to install the flame stabilizer (4) and the flame stabilizer (4) is movable to adjust the relative distance between the flame stabilizer (4) and the inner cylinder assembly (3); The first connecting assembly (8) includes a first sleeve (801) and a clamp (802). The first sleeve (801) is connected to the air inlet pipe (2). The flame stabilizer (4) is installed inside the first sleeve (801) and can move along the axial direction of the first sleeve (801). The clamp (802) is provided on the outer wall surface of the first sleeve (801) and the flame stabilizer (4) and is used to connect the first sleeve (801) and the flame stabilizer (4). The first sleeve (801) is provided with a first protrusion (803) at the end connected to the clamp (802), and the flame stabilizer (4) is provided with a second protrusion (804) at the end connected to the clamp (802). The inner wall surface of the clamp (802) is provided with a limiting groove (805). The first protrusion (803) and the second protrusion (804) can be placed in the limiting groove (805) so that the relative position of the flame stabilizer (4) and the first sleeve (801) remains unchanged.

2. The adjustable pulverized coal burner according to claim 1, characterized in that, It also includes a second connecting component (9) for mounting the inner cylinder assembly (3) and the inner cylinder assembly (3) being movable to adjust the relative distance between the inner cylinder assembly (3) and the flame stabilizer (4).

3. The adjustable pulverized coal burner according to claim 2, characterized in that, The second connecting assembly (9) includes a connecting part (901) for connecting the inner cylinder assembly (3) and the outer cylinder (1), wherein the connecting part (901) includes at least one of a connecting rod, a bolt, and a connecting plate.

4. The adjustable pulverized coal burner according to claim 2, characterized in that, The second connecting component (9) includes a guide rod (902), one end of which is connected to the inner cylinder component (3), and the other end of which passes through the side wall of the air inlet pipe (2) and is placed outside the air inlet pipe (2).

5. The adjustable pulverized coal burner according to claim 4, characterized in that, The second connection component (9) further includes: The second sleeve (903) is installed on the side wall of the air inlet pipe (2), and the guide rod (902) passes through the second sleeve (903) and can move along the axial direction of the second sleeve (903); A sealing component (904) is sleeved on the guide rod (902). The sealing component (904) can move along the guide rod (902). The sealing component (904) is used to seal the connection between the guide rod (902) and the second sleeve (903). A collar (905) is sleeved on the first sleeve (801), and the other ends of the plurality of guide rods (902) are connected to the collar (905). The collar (905) is used to drive the plurality of guide rods (902) to move synchronously.

6. The adjustable pulverized coal burner according to any one of claims 1-5, characterized in that, Also includes: The first tapering section (10) is located between the air inlet end and the outer cylinder (1) and is used to connect the air inlet end and the outer cylinder (1). The cross-sectional area of ​​the first tapering section (10) gradually decreases along the direction from the air inlet end toward the outer cylinder (1). The second straight section (11) is connected to the air inlet end and is used to connect the power plant's supply components to provide the mixed airflow (5) to the air inlet pipe (2). The second tapering section (12) is located between the second straight section (11) and the air inlet and is used to connect the second straight section (11) and the air inlet. The cross-sectional area of ​​the second tapering section (12) gradually decreases along the direction from the air inlet toward the second straight section (11).

7. The adjustable pulverized coal burner according to claim 1, characterized in that, The air inlet pipe (2) is a bent pipe; And / or, the flame stabilizer (4) is fixed on the side wall of the air inlet pipe (2), the working end (401) has an axis, and the axis of the working end (401) coincides with the axis of the first straight section (301).

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