Nozzle assembly, flame stabilizer and pulverized coal burner

Abstract

An embodiment of the present invention provides a nozzle assembly, a flame stabilizer, and a pulverized coal burner, wherein the nozzle assembly includes a combustion tube, a wear-resistant tube, and a fixed cone ring. The combustion tube includes a diffusion cone tube and a silicon carbide cone tube connected in its axial direction; the wear-resistant tube is sleeved on the outside of the combustion tube, and the wear-resistant tube is connected to the diffusion cone tube; the outer peripheral surface of the silicon carbide cone tube includes a conical surface, and a fixed cone ring is provided between the conical surface and the inner wall surface of the wear-resistant tube, the outer peripheral surface of the fixed cone ring is connected to the inner wall surface of the wear-resistant tube, and the inner peripheral surface of the fixed cone ring is offset from the conical surface. The nozzle assembly of the embodiment of the present invention has the characteristics of high high temperature resistance, long service life, and high stability.

Description

Technical Field

[0001] The invention belongs to the technical field of combustion stabilizers, and in particular relates to a nozzle assembly, a combustion stabilizer and a pulverized coal burner. Background Art

[0002] The flame stabilizer is often used as the igniter of the burner to ignite the pulverized coal introduced into the burner.

[0003] When the flame stabilizer is burning, the temperature of the flame stabilizer's nozzle assembly is usually 1200°C. The flame stabilizer's nozzle assembly in the related art is usually made of steel. At a temperature of 1200°C, steel is prone to deformation and coking, which causes the flame stabilizer to not work normally, thereby shortening the flame stabilizer's service life. Summary of the Invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, an embodiment of the present invention provides a spray head assembly.

[0006] The nozzle assembly of the embodiment of the present invention includes:

[0007] The combustion tube includes a diffusion cone and a silicon carbide cone connected in the axial direction.

[0008] A wear-resistant cylinder, which is sleeved on the outside of the combustion cylinder and connected to the diffusion cone cylinder;

[0009] The outer circumference of the silicon carbide cone includes a conical surface. A fixed cone ring is provided between the conical surface and the inner wall of the wear-resistant cylinder. The outer circumference of the fixed cone ring is connected to the inner wall of the wear-resistant cylinder, and the inner circumference of the fixed cone ring is against the conical surface.

[0010] In some embodiments, the inner diameter of the diffusion cone increases in a direction approaching the silicon carbide cone; and the inner diameter of the silicon carbide cone decreases in a direction away from the diffusion cone.

[0011] In some embodiments, the outer peripheral surface of the silicon carbide cone further includes a matching surface adapted to match the inner wall surface of the wear-resistant cylinder, and the matching surface abuts against the inner wall surface of the wear-resistant cylinder.

[0012] An embodiment of the present invention further provides a combustion stabilizer, comprising:

[0013] The nozzle assembly as described in the above embodiment;

[0014] A pulverized coal pipe, part of which is arranged in the combustion tube, and one end of the pulverized coal pipe located in the combustion tube is provided with a backflush channel;

[0015] The cylinder body and the panels and back plates are respectively arranged at both ends of the cylinder body, and the combustion cylinder and the wear-resistant cylinder of the nozzle assembly are connected to the back plate;

[0016] The cylinder is provided with a partition perpendicular to the axial direction of the cylinder, the partition divides the cylinder into an ignition chamber and a secondary air chamber, and the partition is provided with a secondary air hole connecting the ignition chamber and the secondary air chamber;

[0017] The inlet of the combustion cylinder is connected to the ignition chamber.

[0018] In some embodiments, the flame stabilizer of the embodiment of the present invention further includes a secondary air swirl assembly, the air inlet of the secondary air swirl assembly is connected to the ignition chamber, and the air outlet of the secondary swirl assembly is connected to the inlet of the combustion tube.

[0019] In some embodiments, the secondary air swirl assembly includes a swirl tube and swirl blades, one end of the swirl tube is connected to the ignition chamber, the other end of the swirl tube is connected to the inlet of the combustion tube, and the swirl blades are arranged in the swirl tube.

[0020] In some embodiments, the space between the wear-resistant cylinder and the diffusion cone is filled with heat-insulating material.

[0021] In some embodiments, the combustion stabilizer of the embodiment of the present invention further includes a soot blowing assembly, which includes a soot blowing cannon and a soot blowing pipe, one end of the soot blowing pipe is connected to the inlet of the combustion tube, and the other end of the soot blowing pipe is connected to the soot blowing cannon.

[0022] The embodiment of the present invention further provides a pulverized coal burner, comprising:

[0023] As described in the above embodiment, the combustion stabilizer

[0024] ontology,

[0025] Bend pipe, the bend pipe includes a combustion stabilization tube and a coal powder tube,

[0026] The combustion stabilization tube has a first end and a second end opposite to each other in the axial direction thereof, the first end is connected to the body, and the second end is connected to the combustion stabilization device, so that the nozzle assembly of the combustion stabilization device is arranged in the combustion stabilization tube;

[0027] The pulverized coal cylinder is connected to the combustion stabilizing cylinder so as to transport the pulverized coal into the body through the combustion stabilizing cylinder;

[0028] The inner wall of the pulverized coal cylinder is provided with a sedimentation area, and the sedimentation area is provided with a flow disturbance structure.

[0029] In some embodiments, a wear-resistant layer is provided on the inner wall surface of the bent pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 1 is a schematic structural diagram of a nozzle assembly according to an embodiment of the present invention;

[0031] Figure 2 yes Figure 1 A partial enlarged view of part A in the middle;

[0032] Figure 3 1 is a schematic structural diagram of a pulverized coal burner according to an embodiment of the present invention;

[0033] Figure 4 It is a structural schematic diagram of another embodiment of the pulverized coal burner of the embodiment of the present invention.

[0034] Figure Number:

[0035] 100, nozzle assembly; 200, combustion stabilizer; 300, burner;

[0036] 1. Combustion tube;

[0037] 101, diffusion cone; 1011, first opening; 1012, second opening;

[0038] 102, silicon carbide cone; 1021, tapered surface; 1022, mating surface; 1023, third opening; 1024, fourth opening;

[0039] 2. Wear-resistant cylinder;

[0040] 3. Fix the cone ring;

[0041] 4. Pulverized coal pipe; 401. Backflush channel;

[0042] 5. Cylinder; 501. Ignition chamber; 502. Secondary air chamber; 503. Partition; 5031. Secondary air hole; 504. Secondary air channel;

[0043] 6. Panel;

[0044] 7. Back panel;

[0045] 8. Secondary air swirl assembly; 801. Swirl cylinder; 802. Swirl blade;

[0046] 9. Sootblowing assembly; 901. Sootblowing cannon; 902. Sootblowing tube;

[0047] 10. Ontology;

[0048] 11. Bend pipe; 111. Combustion stabilization tube; 112. Pulverized coal tube; 113. Wear-resistant layer;

[0049] 12. Spoiler block; 13. Spoiler hole; 14. Thermal insulation material. DETAILED DESCRIPTION

[0050] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0051] The following is based on the attached Figure 1 A showerhead assembly 100 according to an embodiment of the present invention will be described.

[0052] The nozzle assembly 100 according to the embodiment of the present invention is applied to a combustion stabilizer 200 , wherein the nozzle assembly 100 includes a combustion tube 1 , a wear-resistant tube 2 and a fixed cone ring 3 .

[0053] The combustion tube 1 includes a diffusion cone 101 and a silicon carbide cone 102 connected in the axial direction;

[0054] The wear-resistant cylinder 2 is sleeved on the outside of the combustion cylinder 1 and is connected to the diffusion cone 101;

[0055] The outer circumference of the silicon carbide cone 102 includes a conical surface 1021. A fixed cone ring 3 is provided between the conical surface 1021 and the inner wall surface of the wear-resistant cylinder 2. The outer circumference of the fixed cone ring 3 is connected to the inner wall surface of the wear-resistant cylinder 2, and the inner circumference of the fixed cone ring 3 is against the conical surface 1021.

[0056] It is understandable that in the related art, the temperature of the nozzle of the flame stabilizer 200 is usually around 1200°C, and the nozzle assembly 100 of the flame stabilizer 200 is usually made of steel, which is prone to deformation and coking at a temperature of 1200°C. The deformed and coked nozzle assembly 100 cannot be used normally, which results in a short service life of the flame stabilizer 200.

[0057] To this end, the nozzle assembly 100 of the embodiment of the present invention is configured to have the combustion tube 1 be divided into two parts. The front section of the combustion tube 1 is a diffusion cone 101 made of steel, and the rear section is a silicon carbide cone 102 made of silicon carbide.

[0058] Silicon carbide has extremely high high temperature resistance, which can prevent the nozzle assembly 100 from deforming under the high temperature of the flame and affecting the normal use of the stabilizer 200, thereby greatly improving the high temperature resistance of the nozzle assembly 100 and extending the service life of the nozzle assembly 100.

[0059] Since silicon carbide and steel cannot be welded, in order to connect and fix the silicon carbide cone 102 and the diffusion cone 101, the nozzle assembly 100 of the embodiment of the present invention is provided with a wear-resistant cylinder 2 and a fixed cone ring 3.

[0060] The wear-resistant cylinder 2 is sleeved on the outside of the combustion cylinder 1, and one end of the wear-resistant cylinder 2 adjacent to the diffusion cone cylinder 101 is connected and fixed to the diffusion cone cylinder 101, and one end of the wear-resistant cylinder 2 adjacent to the silicon carbide cone cylinder 102 is connected and fixed to the carbide cone cylinder through a fixed cone ring 3.

[0061] The diffusion cone 101 and the wear-resistant cylinder 2 can be indirectly connected through a connecting piece. For example, the wear-resistant cylinder 2 and the diffusion cone 101 are connected to a plate together, and the wear-resistant cylinder 2 and the diffusion cone 101 are connected and fixed to the plate using fasteners. In this way, the end of the wear-resistant cylinder 2 adjacent to the diffusion cone 101 can also be connected and fixed to the diffusion cone 101.

[0062] It is understandable that there are various ways to connect the end of the wear-resistant cylinder 2 adjacent to the diffusion cone 101 with the diffusion cone 101 . Those skilled in the art can select a suitable connection form according to actual conditions, which will not be described in detail here.

[0063] On the basis of the wear-resistant cylinder 2 and the diffusion cone cylinder 101 being connected and fixed, a fixed cone ring 3 is arranged on the conical surface 1021 of the carbide cone cylinder and the inner wall surface of the wear-resistant cylinder 2, which can apply pressure to the silicon carbide cone cylinder 102 toward the diffusion cone cylinder 101 to squeeze the diffusion cone cylinder 101, thereby achieving the effect of connecting and fixing the carbide cone cylinder and the diffusion cone cylinder 101.

[0064] Therefore, the nozzle assembly 100 of the embodiment of the present invention improves the high temperature resistance of the nozzle assembly 100 and extends the service life of the nozzle assembly 100 by providing a silicon carbide cone cylinder 102 and a fixed cone ring 3. On the other hand, the diffusion cone cylinder 101 and the silicon carbide cone cylinder 102 that cannot be welded are connected, thereby improving the connection stability between the various components of the nozzle assembly 100.

[0065] Therefore, the nozzle assembly 100 according to the embodiment of the present invention has the characteristics of high temperature resistance, long service life and high stability.

[0066] The following is based on the attached Figure 1 The showerhead assembly 100 according to an embodiment of the present invention is further described.

[0067] The nozzle assembly 100 according to the embodiment of the present invention is applied to a combustion stabilizer 200 , wherein the nozzle assembly 100 includes a combustion tube 1 , a wear-resistant tube 2 and a fixed cone ring 3 .

[0068] The combustion tube 1 includes a diffusion cone 101 and a silicon carbide cone 102 connected in the axial direction.

[0069] like Figure 1 As shown, the combustion tube 1 has a combustion inlet and a combustion outlet arranged opposite to each other in its axial direction.

[0070] like Figure 1As shown, the diffusion cone 101 has a first opening 1011 and a second opening 1012 arranged opposite each other in the axial direction, and the silicon carbide cone 102 has a third opening 1023 and a fourth opening 1024 arranged opposite each other in the axial direction. The second opening 1012 of the diffusion cone 101 is connected to the third opening 1023 of the silicon carbide cone, wherein the first opening 1011 of the diffusion cone 101 forms the combustion inlet, and the fourth opening 1024 of the silicon carbide cone forms the combustion outlet.

[0071] The wear-resistant cylinder 2 is sleeved on the outside of the combustion cylinder 1 and is connected to the diffusion cone 101;

[0072] The outer circumference of the silicon carbide cone 102 includes a conical surface 1021. A fixed cone ring 3 is provided between the conical surface 1021 and the inner wall surface of the wear-resistant cylinder 2. The outer circumference of the fixed cone ring 3 is connected to the inner wall surface of the wear-resistant cylinder 2, and the inner circumference of the fixed cone ring 3 is against the conical surface 1021.

[0073] On the basis of the wear-resistant cylinder 2 and the diffusion cone cylinder 101 being connected and fixed, a fixed cone ring 3 is arranged on the conical surface 1021 of the carbide cone cylinder and the inner wall surface of the wear-resistant cylinder 2, which can apply pressure to the silicon carbide cone cylinder 102 toward the diffusion cone cylinder 101 to squeeze the diffusion cone cylinder 101, thereby achieving the effect of connecting and fixing the carbide cone cylinder and the diffusion cone cylinder 101.

[0074] Therefore, the nozzle assembly 100 of the embodiment of the present invention improves the high temperature resistance of the nozzle assembly 100 by providing a silicon carbide cone cylinder 102 and a fixed cone ring 3. On the other hand, the diffusion cone cylinder 101 and the silicon carbide cone cylinder 102 that cannot be welded are connected, thereby improving the connection stability between the various components of the nozzle assembly 100.

[0075] In some embodiments, the wear-resistant cylinder 2 and the fixed cone ring 3 are connected and fixed by fasteners (not shown in the figure), wherein there are multiple fasteners, and the multiple fasteners are arranged at intervals in the circumferential direction of the fixed cone ring 3.

[0076] In some embodiments, as Figure 1 As shown, the inner diameter of the diffusion cone 101 increases in the direction approaching the silicon carbide cone 102 ; and the inner diameter of the silicon carbide cone 102 decreases in the direction away from the diffusion cone 101 .

[0077] In other words, the inner diameter of the diffusion cone 101 increases from the first opening 1011 to the second opening 1012 , and the inner diameter of the silicon carbide cone 102 increases from the third opening 1023 to the fourth opening 1024 .

[0078] Furthermore, if Figure 1 As shown, the outer diameter of the diffusion cone 101 increases in the direction from the first opening 1011 to the second opening 1012 .

[0079] In some embodiments, the outer peripheral surface of the silicon carbide cone 102 further includes a matching surface 1022 adapted to match the inner wall surface of the wear-resistant cylinder 2 , and the matching surface 1022 abuts against the inner wall surface of the wear-resistant cylinder 2 .

[0080] By providing a mating surface 1022 on the outer peripheral surface of the silicon carbide cone cylinder 102 that matches the inner wall surface of the wear-resistant cylinder 2, the mating surface 1022 and the inner wall surface of the wear-resistant cylinder 2 abut against each other, which can further fix the silicon carbide cone ring and improve the stability of the nozzle assembly 100.

[0081] The embodiment of the present invention further provides a combustion stabilizer 200 , comprising the nozzle assembly 100 described in the above embodiment, a pulverized coal pipe 4 , a cylinder 5 , and a panel 6 and a back plate 7 respectively provided at both ends of the cylinder 5 .

[0082] Part of the pulverized coal pipe 4 is arranged in the combustion tube 1. In other words, as shown in the figure, one end of the pulverized coal pipe 4 extends into the combustion tube 1, and the other end of the pulverized coal pipe 4 extends out of the combustion tube 1, and the other end can be connected to a device for conveying pulverized coal to convey pulverized coal into the combustion tube 1 through the pulverized coal pipe 4.

[0083] like Figure 2 As shown, a backflush channel 401 is provided at one end of the pulverized coal pipe 4 located in the combustion tube 1 .

[0084] The angle between the direction of the backflush channel 401 and the pulverized coal conveying direction in the pulverized coal pipe 4 is a, where 0°≤a≤90°.

[0085] Furthermore, there are multiple backflush channels 401 , which are spaced apart on the wall of the pulverized coal pipe 4 in the circumferential direction of the pulverized coal pipe 4 .

[0086] By setting the angle a between the direction of the backflush channel 401 and the coal powder conveying direction in the coal powder pipe 4, where 0°≤a≤90°, the coal powder can be fully mixed and contacted with the air flow in the combustion tube 1, thereby achieving more complete combustion.

[0087] The cylinder 5 and the panels 6 and the back plate 7 are respectively provided at both ends of the cylinder 5. The combustion cylinder 1 and the wear-resistant cylinder 2 of the nozzle assembly 100 are connected to the back plate 7.

[0088] The cylinder 5 is provided with a partition 503 perpendicular to the axial direction of the cylinder 5. The partition 503 divides the cylinder 5 into an ignition chamber 501 and a secondary air chamber 502. The partition 503 is provided with a secondary air hole 5031 connecting the ignition chamber 501 and the secondary air chamber 502.

[0089] In order to allow the secondary air to be introduced into the secondary air bin 502 , a secondary air passage 504 communicating with the secondary air bin 502 may be provided on the cylinder 5 .

[0090] The combustion inlet of the combustion tube 1 is connected to the ignition chamber 501 , so that the air flow can enter the combustion tube 1 through the ignition chamber 501 .

[0091] In some embodiments, the embodiment of the present invention further includes a secondary air swirl assembly 8 , the air inlet of the secondary air swirl assembly 8 is connected to the ignition chamber 501 , and the air outlet of the secondary swirl assembly is connected to the combustion inlet of the combustion tube 1 .

[0092] In some embodiments, the secondary air swirl assembly 8 includes a swirl tube 801 and a swirl blade 802 . One end of the swirl tube 801 is connected to the ignition chamber 501 , and the other end of the swirl tube 801 is connected to the inlet of the combustion tube 1 . The swirl blade 802 is arranged in the swirl tube 801 .

[0093] By setting a secondary air swirl component 8 between the ignition chamber 501 and the combustion inlet of the combustion tube 1, the secondary air can enter the ignition chamber 501 in a swirl manner, and then can be fully mixed with the coal powder in the ignition chamber 501, so that the coal powder in the combustion tube 1 can be fully burned, thereby improving the combustion efficiency.

[0094] In some embodiments, a heat-insulating material 14 is filled between the wear-resistant cylinder 2 and the diffusion cone 101 .

[0095] During the ignition process of the burner stabilizer 200, the temperature of the coal powder introduced into the combustion tube 1 is relatively low and is not easy to ignite.

[0096] By filling the heat-insulating material 14 between the wear-resistant cylinder 2 and the diffusion cone 101 , the temperature of the pulverized coal in the combustion cylinder 1 rises rapidly during the ignition process, thereby reducing the difficulty of ignition of the stabilizer 200 .

[0097] Furthermore, the thermal insulation material 14 may be thermal insulation cotton.

[0098] In some embodiments, the stabilizer 200 of the embodiment of the present invention also includes a soot blowing assembly 9, which includes a soot blowing cannon 901 and a soot blowing pipe 902, one end of the soot blowing pipe 902 is connected to the inlet of the combustion tube 1, and the other end of the soot blowing pipe 902 is connected to the soot blowing cannon 901.

[0099] When a lot of ash is accumulated in the combustion tube 1 of the combustion stabilizer 200 , a high-pressure airflow can be introduced into the combustion tube 1 through the ash blowing cannon 901 to achieve the effect of cleaning the ash accumulated in the combustion tube 1 .

[0100] The embodiment of the present invention further provides a pulverized coal burner 300, such as Figure 3 As shown, it includes a main body 10, a bent pipe 11 and a flame stabilizer 200.

[0101] The bent pipe 11 includes a combustion stabilization tube 111 and a coal powder tube 112.

[0102] The combustion stabilization cylinder 111 has a first end and a second end opposite to each other in the axial direction thereof, the first end is connected to the body 10, and the second end is connected to the combustion stabilization device 200, so that the nozzle assembly 100 of the combustion stabilization device 200 is arranged in the combustion stabilization cylinder 111;

[0103] The pulverized coal cylinder 112 is connected to the combustion stabilizing cylinder 111 so as to transport the pulverized coal into the main body 10 through the combustion stabilizing cylinder 111. The inner wall of the pulverized coal cylinder 112 has a sedimentation area, and the sedimentation area is provided with a turbulent flow structure.

[0104] It is understandable that during the transportation of coal powder in the bent pipe 11, it is easy to settle in the coal powder tube 112. The position of the settlement area on the inner wall of the coal powder tube 112 can be calculated based on the maximum particle size of the coal powder actually used in the coal powder burner 300, combined with the settling velocity of the coal powder particles and the wind speed.

[0105] In some embodiments, as Figure 4 As shown, the flow disturbance structure is a flow disturbance block 12. By arranging the flow disturbance block 12 in the sedimentation area, the flow direction of the pulverized coal in the pulverized coal tube 112 can be changed, thereby preventing the pulverized coal from settling.

[0106] In some embodiments, as Figure 3 As shown, the flow disturbance structure is a flow disturbance hole 13. By setting the flow disturbance hole 13 in the sedimentation area and introducing air flow into the pulverized coal tube 112 through the flow disturbance hole 13, the flow direction of the pulverized coal in the pulverized coal tube 112 is changed, thereby preventing the pulverized coal from settling.

[0107] In some embodiments, a wear-resistant layer 113 is provided on the inner wall surface of the bent pipe 11 . In other words, a wear-resistant layer 113 is provided on the inner wall surfaces of the combustion stabilization cylinder 111 and the pulverized coal cylinder 112 .

[0108] Optionally, the wear-resistant layer 113 is made of ceramic material.

[0109] It can be understood that ceramic materials have extremely high wear resistance and corrosion resistance. By providing a wear-resistant layer 113 made of ceramic material on the inner wall surface of the bent pipe 11, the damage to the bent pipe 11 caused by the flowing coal powder particles can be reduced, thereby extending the service life of the bent pipe 11.

[0110] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0111] 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0112] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0113] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0114] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0115] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A nozzle assembly, characterized in that: include: The combustion tube comprises a diffusion cone and a silicon carbide cone connected in the axial direction thereof, wherein the inner diameter of the diffusion cone increases in a direction approaching the silicon carbide cone; and the inner diameter of the silicon carbide cone decreases in a direction away from the diffusion cone; A wear-resistant cylinder, which is sleeved on the outside of the combustion cylinder and connected to the diffusion cone cylinder; The outer circumference of the silicon carbide cone includes a conical surface. A fixed cone ring is provided between the conical surface and the inner wall of the wear-resistant cylinder. The outer circumference of the fixed cone ring is connected to the inner wall of the wear-resistant cylinder, and the inner circumference of the fixed cone ring is against the conical surface.

2. The nozzle assembly according to claim 1, wherein: The outer peripheral surface of the silicon carbide cone also includes a matching surface suitable for matching with the inner wall surface of the wear-resistant cylinder, and the matching surface is against the inner wall surface of the wear-resistant cylinder.

3. A combustion stabilizer, characterized in that: include: The nozzle assembly according to any one of claims 1 to 2; A pulverized coal pipe, a portion of which is disposed in the combustion tube, and a backflush channel is provided at one end of the pulverized coal pipe located in the combustion tube; A cylinder and a panel and a back plate respectively provided at both ends of the cylinder, wherein the combustion cylinder and the wear-resistant cylinder of the nozzle assembly are connected to the back plate; The cylinder is provided with a partition perpendicular to the axial direction of the cylinder, the partition divides the cylinder into an ignition chamber and a secondary air chamber, and the partition is provided with a secondary air hole connecting the ignition chamber and the secondary air chamber; The inlet of the combustion cylinder is connected to the ignition chamber.

4. The combustion stabilizer according to claim 3, characterized in that: It also includes a secondary air swirl component, the air inlet of the secondary air swirl component is connected to the ignition chamber, and the air outlet of the secondary air swirl component is connected to the inlet of the combustion tube.

5. The combustion stabilizer according to claim 4, characterized in that: The secondary air swirl assembly includes a swirl tube and swirl blades. One end of the swirl tube is connected to the ignition chamber, and the other end of the swirl tube is connected to the inlet of the combustion tube. The swirl blades are arranged in the swirl tube.

6. The combustion stabilizer according to claim 3, characterized in that: The space between the wear-resistant cylinder and the diffusion cone is filled with heat-insulating material.

7. The combustion stabilizer according to claim 3, characterized in that: It also includes a soot blowing assembly, which includes a soot blowing cannon and a soot blowing pipe. One end of the soot blowing pipe is connected to the inlet of the combustion tube, and the other end of the soot blowing pipe is connected to the soot blowing cannon.

8. A pulverized coal burner, characterized in that: The flame stabilizer according to any one of claims 3 to 7 further comprises: ontology, Bend pipe, the bend pipe includes a combustion stabilization tube and a coal powder tube, The combustion stabilization tube has a first end and a second end opposite to each other in the axial direction thereof, the first end is connected to the body, and the second end is connected to the combustion stabilization device, so that the nozzle assembly of the combustion stabilization device is arranged in the combustion stabilization tube; The pulverized coal cylinder is connected to the combustion stabilizing cylinder so as to transport the pulverized coal into the body through the combustion stabilizing cylinder; The inner wall of the pulverized coal cylinder is provided with a sedimentation area, and the sedimentation area is provided with a flow disturbance structure.

9. The pulverized coal burner according to claim 8, characterized in that: A wear-resistant layer is provided on the inner wall surface of the bent pipe member.

Images