Combustor and rotary kiln

Abstract

The application discloses a burner and a rotary kiln, and the burner comprises a first pipe, a second pipe and an ignition device; one end of the first pipe is provided with a first air inlet, and the other end is provided with a first sealing plate; the inside of the second pipe is divided into a combustion section and an air inlet section, and a partition plate is provided with a communication hole; the air inlet section is provided with a second sealing plate, and the air inlet section is provided with a second air inlet; the first pipe is inserted into the air inlet section, and the end of the first pipe provided with the first sealing plate penetrates through the partition plate and extends to the combustion section; the pipe wall of the first pipe located in the combustion section is provided with a first air outlet hole at intervals; and the ignition end of the ignition device is arranged on the side of the first sealing plate away from the air inlet section. The propagation directions of the combustible gas entering the combustion section and the first combustion-supporting gas entering the combustion section are crossed, the combustible gas is driven by the first combustion-supporting gas and propagates towards the ignition end of the ignition device, is fully mixed with the combustible gas to form mixed gas, is more easily ignited, the combustion effect of the mixed gas is better, and the flame temperature after ignition is improved.

Description

Technical Field

[0001] This application relates to the field of rotary kiln technology, and more particularly to a burner and a rotary kiln. Background Technology

[0002] In smelting production, smelting slag is generated, which is a type of industrial solid waste. With the development of production, solid waste is increasing year by year, making its treatment an urgent problem. Solid waste is often treated by combustion in a rotary kiln, where the burner provides the kiln body with a high-temperature flame for smelting. In actual use, the burner needs to be supplied with combustible gas and combustion-supporting gas, and the mixture is ignited by an igniter. In existing technologies, the combustible gas and combustion-supporting gas are not fully mixed before the igniter ignites the mixture, making it difficult to ignite and resulting in poor ignition.

[0003] Therefore, improvements to existing technologies are necessary. Utility Model Content

[0004] This application aims to solve at least one of the technical problems existing in the prior art by providing a burner and a rotary kiln.

[0005] According to one aspect of this application, a burner is provided for use in a rotary kiln. The burner includes a first tube, a second tube, and an ignition element. The first tube has a first air inlet at one end and a first sealing plate at the other end. The first air inlet is configured to provide combustible gas into the first tube. The second tube is divided into a combustion section and an air inlet section along its axial direction by a partition plate. The partition plate has multiple connecting holes. The air inlet section has a second sealing plate at its end away from the combustion section, and the air inlet section has a second air inlet configured to provide a first combustion-supporting gas into the air inlet section. The first tube is inserted into the air inlet section, and the end of the first tube with the first sealing plate penetrates the partition plate and extends into the combustion section. The wall of the first tube located in the combustion section has multiple first air outlets spaced apart. The ignition element has its ignition end located on the side of the first sealing plate away from the air inlet section.

[0006] In one embodiment, the first tube and the second tube are coaxially arranged, and the end of the first tube with the first air inlet passes through the second sealing plate.

[0007] In one embodiment, the ignition element is inserted into the intake section, and the ignition end of the ignition element extends through the partition plate to the combustion section, and the end of the ignition element away from the ignition end extends through the second sealing plate.

[0008] In one embodiment, a flame detection element is further included, which is inserted into the air intake section, and the detection end of the flame detection element extends through the partition plate and into the combustion section; the detection end and the ignition end are respectively disposed on both sides of the first pipe radially.

[0009] In one embodiment, a third tube is further included, which is sleeved on the second tube to form a cavity between the second tube and the third tube; one end of the cavity is blocked by the second sealing plate, and the other end is provided with a third sealing plate; the third tube is provided with a third air inlet, which is configured to provide the first combustion-supporting gas into the cavity; the peripheral wall of the combustion section is provided with a plurality of second air outlets at intervals.

[0010] In one embodiment, the angle between the axis of the second vent and the axis of the second pipe is α, satisfying: 30°≤α≤60°.

[0011] In one embodiment, a sealing ring is provided between the combustion section and the third pipe to divide the cavity into a first sub-cavity and a second sub-cavity, the second sub-cavity being located on the side of the sealing ring away from the air intake section; the sealing ring divides the combustion section along the axial direction of the second pipe into a combustion initiation section and a combustion tail section, the combustion initiation section being located between the combustion tail section and the air intake section; the burner further includes a fourth pipe, the fourth pipe being configured to provide a second combustion-supporting gas to the second sub-cavity, the third air intake being configured to provide a first combustion-supporting gas to the first sub-cavity, the oxygen content of the second combustion-supporting gas being higher than the oxygen content of the first combustion-supporting gas; the peripheral walls of both the combustion initiation section and the combustion tail section are provided with a second air outlet.

[0012] In one embodiment, the diameter of the second exhaust port in the combustion tail section is smaller than the diameter of the second exhaust port in the combustion initiation section.

[0013] In one embodiment, the fourth tube is inserted into the first sub-cavity, with one end of the fourth tube penetrating the sealing ring and the other end penetrating the second sealing plate.

[0014] According to another aspect of this application, a rotary kiln is provided, comprising any of the burners described above.

[0015] The beneficial effects of this application are as follows: the first combustion-supporting gas entering the combustion section through the connecting hole propagates axially along the second pipe, and the combustible gas entering the combustion section through the first outlet hole propagates radially along the first pipe. That is, the propagation directions of the combustible gas entering the combustion section and the first combustion-supporting gas entering the combustion section intersect. Under the driving force of the first combustion-supporting gas, the combustible gas propagates towards the ignition end of the ignition element. During the propagation of the first combustion-supporting gas towards the ignition end, it will fully mix with the combustible gas to form a mixed gas. When the mixed gas passes through the ignition end, it is easier to ignite, and the combustion effect of the mixed gas is better, which is conducive to increasing the flame temperature after ignition. It can provide a high-temperature flame for the rotary kiln and meet the smelting needs of the rotary kiln. Attached Figure Description

[0016] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0017] Figure 1 This is a schematic diagram of a burner provided in an embodiment of this application.

[0018] Figure 2 This is a schematic diagram of another burner provided in an embodiment of this application.

[0019] Figure 3 Figure 2 Enlarged view of point A in the middle.

[0020] Figure 4 yes Figure 2 Side view.

[0021] Figure 5 This is a schematic diagram of a second tube and a fourth tube provided in an embodiment of this application.

[0022] In the picture:

[0023] 10. First pipe; 11. First air inlet; 12. First sealing plate; 13. First air outlet;

[0024] 20. Second pipe; 21. Combustion section; 211. Initial combustion section; 212. Final combustion section; 2121. Second exhaust port; 22. Intake section; 23. Second sealing plate; 24. Second intake port;

[0025] 30. Third pipe; 31. Third sealing plate; 32. Third air inlet;

[0026] 40. Fourth pipe; 41. Fourth air inlet;

[0027] 50. Ignition element; 51. Ignition terminal;

[0028] 60. Spare plate; 61. Connecting hole;

[0029] 70. Washer ring;

[0030] 80. Flame detection component; 81. Detection end;

[0031] 90. Cavity; 91. First sub-cavity; 92. Second sub-cavity;

[0032] 100. Sealing ring;

[0033] 201. Flame arrester; 202. Electric regulating valve; 203. Solenoid valve; 204. Pressure switch; 205. Shut-off valve; 206. Fan. Detailed Implementation

[0034] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0035] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, 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 between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0036] The burner and rotary kiln of this application will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] In the prior art, before the ignition element ignites the gas mixture, the combustible gas and the combustion-supporting gas are not mixed sufficiently, making the gas mixture difficult to ignite and resulting in poor ignition effect.

[0038] To address the aforementioned technical problems, this application provides a burner applied to a rotary kiln. The burner includes a first tube, a second tube, and an ignition element. The first tube has a first air inlet at one end and a first sealing plate at the other end. The first air inlet is configured to provide combustible gas into the first tube. The second tube is divided into a combustion section and an air inlet section along its axial direction by a partition plate, the partition plate having multiple connecting holes. The air inlet section has a second sealing plate at its end away from the combustion section, and a second air inlet is configured to provide a first combustion-supporting gas into the air inlet section. The first tube is inserted into the air inlet section, and the end of the first tube with the first sealing plate penetrates the partition plate and extends into the combustion section. The wall of the first tube located in the combustion section has multiple first air outlets spaced apart. The ignition element has its ignition end located on the side of the first sealing plate away from the air inlet section. The details are described below.

[0039] See Figures 1-4 The burner is used in a rotary kiln and includes a first tube 10, a second tube 20, and an ignition element 50. The first tube 10 has a first air inlet 11 at one end and a first sealing plate 12 at the other end. The first air inlet 11 is configured to supply combustible gas into the first tube 10. The second tube 20 is divided into a combustion section 21 and an air inlet section 22 along its axial direction by a partition plate 60. The partition plate 60 has multiple connecting holes 61. The end of the air inlet section 22 furthest from the combustion section 21 is... There is a second sealing plate 23, and the air intake section 22 is provided with a second air inlet 24, which is configured to provide a first combustion-supporting gas into the air intake section 22; a first pipe 10 is inserted into the air intake section 22, and the end of the first pipe 10 with the first sealing plate 12 passes through the partition plate 60 and extends to the combustion section 21; the pipe wall of the first pipe 10 located in the combustion section 21 is provided with a plurality of first air outlet holes 13 at intervals; the ignition element 50 has its ignition end 51 disposed on the side of the first sealing plate 12 away from the air intake section 22.

[0040] Combustible gas entering the first pipe 10 from the first air inlet 11 is passed toward the end of the first pipe 10 where the first sealing plate 12 is located, and finally discharged from the first air outlet 13. Since the first air outlet 13 is located in the part of the first pipe 10 located in the combustion section 21, the combustible gas enters the combustion section 21 through the first air outlet 13. The first combustion-supporting gas entering from the second air inlet 24 enters the air intake section 22 and then enters the combustion section 21 through the connecting hole 61 on the partition plate 60.

[0041] The first combustion-supporting gas, entering the combustion section 21 through the connecting hole 61, propagates axially along the second pipe 20. Figure 1From a perspective of right to left, the combustible gas entering the combustion section 21 through the first vent 13 propagates radially along the first pipe 10. That is, the propagation direction of the combustible gas entering the combustion section 21 intersects with that of the first combustion-supporting gas entering the combustion section 21. Under the driving force of the first combustion-supporting gas, the combustible gas propagates toward the ignition end 51 of the ignition element 50. During the propagation of the first combustion-supporting gas toward the ignition end 51, it will fully mix with the combustible gas to form a mixed gas. This mixed gas is easier to ignite when it passes through the ignition end 51, and the combustion effect of the mixed gas is better, which is conducive to increasing the flame temperature after ignition and providing a high-temperature flame for the rotary kiln to meet the smelting needs of the rotary kiln.

[0042] It should be noted that the ignition element 50 in this embodiment can be an ignition electrode, and the ignition end 51 of the ignition element 50 is the end that can ignite the gas. The ignition end 51 is located on the side of the first sealing plate 12 away from the air intake section 22, which can provide a sufficient propagation path for the mixing of combustible gas and the first combustion-supporting gas. That is, the mixed gas (combustible gas and first combustion-supporting gas) has a sufficient propagation distance to be fully mixed before reaching the ignition end 51.

[0043] It is worth mentioning that the first sealing plate 12 and the first pipe 10 can be connected as a whole by welding or other means. In some embodiments, the first sealing plate 12 and the first pipe 10 can also be set as a whole. Similarly, the arrangement between the second sealing plate 23 and the second pipe 20 is similar to the arrangement between the first pipe 10 and the first sealing plate 12, which will not be described in detail. In some embodiments, a gasket 70 can also be provided between the second pipe 20 and the second sealing plate 23 to ensure the airtightness of the air intake section 22. The gasket 70 can also be part of the second pipe 20 (i.e., the gasket 70 is set as a whole with the second pipe 20), which facilitates the connection operation between the second pipe 20 and the second sealing plate 23.

[0044] In addition, in some embodiments, the surface of the first sealing plate 12 facing the first air inlet 11 (i.e. the surface located inside the first pipe 10) is curved. The combustible gas entering the first pipe 10 can be better guided into the first air outlet 13 by the curved surface. The specific shape of the curved surface can be determined according to the orientation of the first air outlet 13, which will not be described in detail here.

[0045] In some embodiments, the combustible gas may be a gas such as hydrogen, and the first combustion-supporting gas may be a gas such as air (which may be provided by the fan 206). No specific limitation is made here, and the relevant gas is determined according to the actual ignition requirements.

[0046] In some embodiments, the first tube 10 and the second tube 20 are coaxially arranged, and the end of the first tube 10 with the first air inlet 11 passes through the second sealing plate 23.

[0047] The first tube 10 and the second tube 20 are coaxially arranged. The space around the wall of the first tube 10 in the combustion section 21 (the radial distance between the outer wall of the first tube 10 and the inner wall of the second tube 20 is the same) is uniform, that is, the concentration of the mixed gas in each part is uniform. After ignition, the flame is stable, which is conducive to the control of the flame position after ignition. After ignition, the flame can be controlled near the central axis of the combustion section 21 of the second tube 20. When heating in a rotary kiln for smelting, the position of the flame in the rotary kiln can be precisely controlled, which is beneficial to the smelting of materials in the rotary kiln.

[0048] When the first tube 10 and the second tube 20 are not coaxial (i.e., eccentrically set), there will be differences in the space around the tube wall of the first tube 10 in the combustion section 21, and the concentration of the mixed gas in each part will be different, which may lead to unstable flame after ignition.

[0049] It is worth mentioning that the end of the first tube 10 with the first air inlet 11 passes through the second sealing plate 23, that is, the first air inlet 11 is located on the side of the second sealing plate 23 away from the second tube 20, that is, the first air inlet 11 is away from the ignition end of the ignition element 50, which is conducive to improving the safety of use.

[0050] In some embodiments, the ignition element 50 is inserted into the intake section 22, and the ignition end 51 of the ignition element 50 extends through the partition plate 60 to the combustion section 21, and the end of the ignition element 50 away from the ignition end 51 extends through the second sealing plate 23.

[0051] In this embodiment, the ignition end 51 of the ignition element 50 penetrates the partition plate 60, and the other end penetrates the second sealing plate 23. That is, the ignition element 50 extends along the axial direction of the second pipe 20 (the ignition element 50 can be arranged parallel to the axial direction of the second pipe 20, or at a certain angle to the axial direction of the second pipe 20, etc. The overall extension trend of the ignition element 50 is along the axial direction of the second pipe 20). The ignition element 50 is inserted into the partition plate 60. Since the partition plate 60 is provided with a connecting hole 61, that is, the ignition element 50 is provided with a connecting hole 61 on its periphery, the first combustion-supporting gas (propagating along the axial direction of the second pipe 20) entering the combustion section 21 through the connecting hole 61 can be guided to the ignition end 51 of the ignition element 50 under the guidance of the ignition element 50. After the mixed gas is ignited, the heat of the ignition end 51 can be carried away, preventing the ignition element 50 from being damaged due to high temperature. At the same time, it reduces the formation of carbon deposits on the ignition end 51, which is beneficial to improving the service life of the ignition element 50 and improving the ignition effect of the ignition element 50.

[0052] It is worth mentioning that the part of the ignition element 50 located in the intake section 22 is surrounded by the first combustion-supporting gas entering the intake section 22. The first combustion-supporting gas can carry away the heat of this part of the ignition element 50, preventing the ignition element 50 from overheating and improving the service life of the ignition element 50.

[0053] In some embodiments, the burner further includes a flame detection element 80, which is inserted into the air intake section 22. The detection end 81 of the flame detection element 80 extends through the partition plate 60 and into the combustion section 21. The detection end 81 and the ignition end 51 are respectively disposed on both sides of the first tube 10 in the radial direction.

[0054] The detection end 81 and the ignition end 51 are respectively located on both sides of the radial direction of the first tube 10, which helps to ensure that there is sufficient distance between the two (detection end 81 and ignition end 51) and avoid the spark of the ignition end 51 from affecting the detection result of the detection end 81; and the first combustion-supporting gas can also carry away the heat of the detection end 81 (see the above embodiment for details), avoid the flame detection element 80 from getting too hot, and improve its service life.

[0055] In some embodiments, the burner further includes a third tube 30, which is sleeved on the second tube 20 to form a cavity 90 between the second tube 20 and the third tube 30; one end of the cavity 90 is blocked by a second sealing plate 23, and the other end is provided with a third sealing plate 31; the third tube 30 is provided with a third air inlet 32, which is configured to provide a first combustion-supporting gas into the cavity 90; the peripheral wall of the combustion section 21 is provided with a plurality of second air outlets 2121 at intervals.

[0056] The first combustion-supporting gas is introduced into the cavity 90 through the third air inlet 32. Part of the first combustion-supporting gas entering the cavity 90 enters the intake section 22 through the second air inlet 24 and propagates into the combustion section 21 along the axial direction of the second pipe 20 through the connecting hole 61. The other part moves along the cavity 90 to the second air outlet 2121 on the combustion section 21 and enters the combustion section 21 through the second air outlet 2121. The first combustion-supporting gas can be provided to the cavity 90 and the intake section 22 through the third air inlet 32, which reduces the design of external pipelines (there is no need to lay pipelines separately to introduce the first combustion-supporting gas into the second air inlet 24), simplifies the structure, and reduces production costs.

[0057] Meanwhile, the flame formed by the ignition element 50 is further combusted under the action of the first combustion-supporting gas (the first combustion-supporting gas entering through the second vent 2121). By increasing the concentration of the first combustion-supporting gas, the flame temperature is increased (higher than the flame temperature of the ignition end 51). The air intake from the periphery of the combustion section 21 helps to concentrate the flame near the axis of the second pipe 20 (the middle position of the combustion section 21 of the second pipe 20), which constrains the flame (constrains the combustible gas in the middle position of the second pipe 20), prevents the flame from getting out of control, and the flame energy is more concentrated, which helps to increase the flame temperature.

[0058] It should be noted that the third sealing plate 31 is annular and is disposed between the second tube 20 and the third tube 30. The assembly operation can be completed by welding. In some embodiments, the third sealing plate 31 can also be part of the third tube 30, that is, the third sealing plate 31 and the third tube 30 are integrally disposed, but it is not limited to this.

[0059] In some embodiments, the second vent holes 2121 on the same circumference of the second tube 20 are referred to as vent unit groups. Multiple vent unit groups are spaced apart along the axial direction of the second tube 20. The orthographic projection interval of each second vent hole 2121 in adjacent vent unit groups on the projection plane (the plane perpendicular to the axial direction of the second tube 20) avoids the second vent holes 2121 on the same circumference being too dense, which would affect the rigidity of the second tube 20 (combustion section 21). This arrangement can ensure the rigidity of the second tube 20 and ensure that the first combustion-supporting gas (entering through the second vent holes 2121) covers a large area and can fully react with the flame to increase the flame temperature.

[0060] In some embodiments, the angle between the axis of the second vent 2121 and the axis of the second tube 20 is α, satisfying: 30°≤α≤60°, such as 30°, 35°, 40°, 45°, 50°, 55°, 60°, etc.

[0061] The axis of the second vent 2121 is set at an angle to the axis of the second tube 20, that is, the second vent 2121 is set at an angle. The first combustion aid entering the combustion section 21 from the second vent 2121 can enter the combustion section 21 at an angle (to the left in the figure). It exerts a force on the flame toward the end of the combustion section 21 away from the air inlet section 22 (to the left), which increases the flame injection speed and injection pressure, and increases the flame penetration. When used in a rotary kiln, the flame can heat the far end of the rotary kiln (the end away from the burner), thereby improving the quality of material processing in the rotary kiln.

[0062] When α is less than 30°, the axis of the second vent 2121 is close to parallel to the axis of the second tube 20, and the flow direction of the first combustion-supporting gas entering from the second vent 2121 is close to parallel to the flame, resulting in a moderate flame-raising effect. When α is greater than 60°, the axis of the second vent 2121 is close to perpendicular to the axis of the second tube 20, and the flow direction of the first combustion-supporting gas entering from the second vent 2121 is close to perpendicular to the flame, which is not conducive to the flame extending to the left, and the flame size in the axial direction of the second tube 20 is relatively small.

[0063] See Figure 2 as well as Figure 5In some embodiments, a sealing ring 100 is provided between the combustion section 21 and the third pipe 30 to divide the cavity 90 into a first sub-cavity 91 and a second sub-cavity 92. The second sub-cavity 92 is located on the side of the sealing ring 100 away from the intake section 22. The sealing ring 100 divides the combustion section 21 along the axial direction of the second pipe 20 into a combustion initiation section 211 and a combustion tail section 212. The combustion initiation section 211 is located between the combustion tail section 212 and the intake section 22. The burner also includes a fourth pipe 40, which is configured to provide a second combustion-supporting gas to the second sub-cavity 92. The third intake port 32 is configured to provide a first combustion-supporting gas to the first sub-cavity 91. The oxygen content of the second combustion-supporting gas is higher than that of the first combustion-supporting gas. The peripheral walls of both the combustion initiation section 211 and the combustion tail section 212 are provided with second exhaust ports 2121.

[0064] By setting the sealing ring 100, the cavity 90 is divided into a first sub-cavity 91 and a second sub-cavity 92. A first combustion-supporting gas is introduced into the first sub-cavity 91, and the first combustion-supporting gas in the first sub-cavity 91 enters the second pipe 20 through the second vent 2121 on the combustion initiation section 211. A second combustion-supporting gas is introduced into the second sub-cavity 92, and the second combustion-supporting gas enters the second pipe 20 through the second vent 2121 on the combustion tail section 212. After the combustible gas is ignited at the ignition end 51, the flame passes through the combustion initiation section 211 and the combustion tail section 212 in sequence, that is, it passes through the first combustion-supporting gas and the second combustion-supporting gas in sequence.

[0065] Under the action of the first combustion-supporting gas (the first combustion-supporting gas entering through the second vent 2121), the flame temperature initially rises (higher than the flame temperature at the ignition end 51). Then, under the action of the second combustion-supporting gas (the second combustion-supporting gas has a higher oxygen content than the first combustion-supporting gas), the flame temperature can be further increased, so that the flame temperature gradually increases to meet the requirements of the rotary kiln. Through a simple structure, the flame temperature is gradually increased. Specifically, the first combustion-supporting gas and the combustible gas near the ignition end 51 are fully mixed, and the combustible gas is fully burned, which increases the flame temperature. Then, by passing through the two sections of the second vent 2121, the flame temperature is gradually increased, and finally the burner can obtain a flame with a high temperature.

[0066] It is worth mentioning that as the flame temperature gradually increases, the ignition end 51 is moved away from the end with the higher flame temperature, preventing the ignition element 50 from being damaged due to high temperature and extending its service life. In addition, under the action of the first combustion-supporting gas (entering through the second vent 2121 on the combustion initiation section 211), the flame is constrained to the middle position of the second tube 20 (see the aforementioned embodiment for details), and the flame is relatively stable (it will not stray radially along the second tube 20). The stable flame entering the second combustion-supporting gas (with high oxygen content) helps to improve the overall safety of the burner.

[0067] It should be noted that, in this embodiment, the second combustion-supporting gas can be oxygen. In some embodiments, one end of the fourth pipe 40 passes through the sealing ring 100, and the other end passes through the first sub-cavity 91 and then through the second sealing plate 23, resulting in a reasonable overall structural arrangement.

[0068] In some embodiments, the diameter of the second vent 2121 of the combustion tail section 212 is smaller than the diameter of the second vent 2121 of the combustion initiation section 211.

[0069] The smaller the diameter of the second vent 2121, the higher the gas velocity after passing through the second vent 2121; that is, the velocity of the second combustion-supporting gas entering (entering the second pipe 20) in the combustion tail section 212 is greater than the velocity of the first combustion-supporting gas entering (entering the second pipe 20) in the combustion initial section 211, which can gradually enhance the flame jet speed and jet pressure, and increase the flame penetration.

[0070] In some embodiments, the second vent 2121 is inclined (the axis of the second vent 2121 is at an angle to the axis of the second tube 20, see the foregoing embodiments for details), which can increase the length of the flame and enable the flame to heat the far end (the end away from the burner) inside the rotary kiln, thereby improving the quality of material processing inside the rotary kiln.

[0071] In some embodiments, the fourth tube 40 is inserted into the first sub-cavity 91, and one end of the fourth tube 40 passes through the sealing ring 100, and the other end passes through the second sealing plate 23.

[0072] In this embodiment, the fourth tube 40 utilizes the space of the first sub-cavity 91, which reduces space occupation compared to setting it on the outside of the third tube 30. The structure is reasonably arranged, and the third tube 30 has a protective effect on the fourth tube 40, preventing the leakage of the second combustion-supporting gas with high oxygen content in the fourth tube 40. With this setting, even if there is a leak, it will leak inside the third tube 30, improving the safety of the burner.

[0073] The fourth tube 40 penetrates the sealing ring 100, eliminating the need for drilling holes in the peripheral wall of the third tube 30, which improves the integrity of the third tube 30 and enhances the overall airtightness. Additionally, the other end of the fourth tube 40 (which has a fourth air inlet 41) penetrates the second sealing plate 23. In some embodiments, the fourth air inlet 41, the first air inlet 11, the end of the ignition element 50, and the end of the flame detection element 80 are all located on the second sealing plate 23. Figure 2 From the perspective of the second sealing plate 23 (located to the right), it is conducive to the centralized arrangement of external pipelines and to improving assembly efficiency.

[0074] It is worth mentioning that, in some embodiments, the first air inlet 11 is connected to a flame arrester 201, an electric regulating valve 202, a solenoid valve 203, a pressure switch 204, and a shut-off valve 205. The electric regulating valve 202 and the solenoid valve 203 can automatically regulate the gas flow rate entering the first air inlet 11. The flame arrester 201 can prevent the flame from spreading backward and coming into contact with the external gas supply pipeline of the combustible gas, thus improving the safety of use. In an emergency, the pipeline can also be cut off by the shut-off valve 205 to ensure safe use.

[0075] In some embodiments, the fourth air inlet 41 and the third air inlet 32 ​​may also be connected to components such as an electric regulating valve 202, a solenoid valve 203, and a pressure switch 204. These will not be described in detail here, but will be determined according to the actual pipeline connection requirements.

[0076] On the other hand, this application also relates to a rotary kiln, including any of the aforementioned burners.

[0077] Using the technical solution provided in this application embodiment, the first combustion-supporting gas entering the combustion section 21 through the connecting hole 61 propagates axially along the second pipe 20, and the combustible gas entering the combustion section 21 through the first exhaust hole 13 propagates radially along the first pipe 10. That is, the propagation directions of the combustible gas entering the combustion section 21 and the first combustion-supporting gas entering the combustion section 21 intersect. Under the driving action of the first combustion-supporting gas, the combustible gas propagates toward the ignition end 51 of the ignition element 50. During the propagation of the first combustion-supporting gas toward the ignition end 51, it will fully mix with the combustible gas to form a mixed gas. This mixed gas is easier to ignite when it passes through the ignition end 51, and the combustion effect of the mixed gas is better, which is conducive to increasing the flame temperature after ignition and providing a high-temperature flame for the rotary kiln to meet the smelting needs of the rotary kiln.

[0078] In the various embodiments of this application, unless otherwise specified or logically conflicting, the terminology or descriptions between different embodiments are consistent and can be referenced mutually. Technical features in different embodiments can be combined to form new embodiments based on their inherent logical relationships. In this application, "at least one" means one or more, and "more than one" means two or more.

[0079] It is understood that the various numerical designations used in the embodiments of this application are merely for descriptive convenience and are not intended to limit the scope of the embodiments of this application. The order of the process numbers described above does not imply the order of execution; the execution order of each process should be determined by its function and internal logic.

[0080] The burner and rotary kiln provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand this application and its core ideas. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A burner, characterized by The burner, used in a rotary kiln, comprises: The first pipe has a first air inlet at one end and a first sealing plate at the other end. The first air inlet is configured to provide combustible gas into the first pipe. The second pipe is internally divided into a combustion section and an air intake section along the axial direction of the second pipe by a partition plate. The partition plate has multiple connecting holes. The end of the air intake section away from the combustion section is provided with a second sealing plate, and the air intake section is provided with a second air inlet. The second air inlet is configured to provide a first combustion-supporting gas into the air intake section. The first pipe is inserted into the intake section, and the end of the first pipe with the first sealing plate penetrates the partition plate and extends to the combustion section; the pipe wall of the first pipe located in the combustion section is provided with a plurality of first air outlet holes at intervals; and The ignition element has its ignition end located on the side of the first sealing plate away from the air intake section.

2. The burner as claimed in claim 1, characterized in that, The first tube and the second tube are coaxially arranged, and the end of the first tube with the first air inlet passes through the second sealing plate.

3. The burner as described in claim 1, characterized in that, The ignition element is inserted into the intake section, and the ignition end of the ignition element extends through the partition plate to the combustion section, while the end of the ignition element away from the ignition end extends through the second sealing plate.

4. The burner as described in claim 3, characterized in that, It also includes a flame detection element, which is inserted into the air intake section, and the detection end of the flame detection element extends through the partition plate and into the combustion section; The detection end and the ignition end are respectively located on both sides of the radial direction of the first tube.

5. The burner as claimed in claim 1, characterized in that, It also includes a third tube, which is sleeved on the second tube to form a cavity between the second tube and the third tube; one end of the cavity is blocked by the second sealing plate, and the other end is provided with the third sealing plate; The third pipe is provided with a third air inlet, which is configured to provide the first combustion-supporting gas into the cavity; the peripheral wall of the combustion section is provided with a plurality of second air outlets at intervals.

6. The burner as described in claim 5, characterized in that, The angle between the axis of the second air outlet and the axis of the second pipe is α, which satisfies: 30°≤α≤60°.

7. The burner as claimed in claim 5, characterized in that, A sealing ring is provided between the combustion section and the third pipe to divide the cavity into a first sub-cavity and a second sub-cavity. The second sub-cavity is located on the side of the sealing ring away from the intake section. The sealing ring divides the combustion section along the axial direction of the second pipe into a combustion initiation section and a combustion tail section, with the combustion initiation section located between the combustion tail section and the intake section; The burner further includes a fourth tube configured to provide a second combustion-supporting gas to the second sub-chamber, and a third air inlet configured to provide a first combustion-supporting gas to the first sub-chamber, wherein the oxygen content of the second combustion-supporting gas is higher than that of the first combustion-supporting gas. The peripheral walls of both the initial combustion section and the final combustion section are provided with the second air outlet.

8. The burner as claimed in claim 7, characterized in that, The diameter of the second exhaust port in the combustion tail section is smaller than the diameter of the second exhaust port in the combustion initiation section.

9. The burner as claimed in claim 7, characterized in that, The fourth tube is inserted into the first sub-cavity, with one end of the fourth tube penetrating the sealing ring and the other end penetrating the second sealing plate.

10. A rotary kiln characterized by, Includes the burner as described in any one of claims 1 to 9.

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