A shuttle kiln natural gas pure oxygen burner and a shuttle kiln

Abstract

The present invention discloses a shuttle kiln natural gas pure oxygen burner, which includes a primary gas transmission channel, a secondary gas transmission channel and a sleeve. The sleeve is provided with an ignition section, a contraction section and an outlet section. The ignition section is connected to the outlet section through the contraction section, and the outlet section is connected to the outside. The primary gas transmission channel is connected to the ignition section through the secondary gas transmission channel; an air inlet hole is provided at the connection between the ignition section and the secondary gas transmission channel, and the ignition section is connected to the outside through the air inlet hole; the diameter of the contraction section gradually decreases from the connection between the contraction section and the ignition section to the direction of the outlet section, so that the air pressure in the contraction section is lower than the air pressure in the ignition section. Correspondingly, the present invention also provides a shuttle kiln, which includes the above-mentioned shuttle kiln natural gas pure oxygen burner. By adopting the present invention, it has the advantages of effectively controlling the combustion power, increasing the convective heat transfer intensity, reducing the temperature of the core flame, and being applicable to ceramic firing.

Description

Technical Field

[0001] The present invention relates to the technical field of ceramic equipment, and in particular to a shuttle kiln natural gas pure oxygen burner and a shuttle kiln. Background Art

[0002] Since the ceramic industry highly depends on fossil energy and is a major carbon consumer of natural gas, realizing natural gas pure oxygen combustion in shuttle kilns can not only reduce the natural gas consumption of ceramic factories and lower costs, but also completely eliminate NOx pollution and reduce CO2 emissions, achieving multiple benefits.

[0003] Although the application of pure oxygen burner technology currently exists in the metallurgical industry and the glass industry, due to the different kiln shapes in the ceramic industry from those in the metallurgical industry and the glass industry, the shuttle kiln burners in the metallurgical industry and the glass industry cannot be directly applied to the shuttle kilns in the ceramic industry.

[0004] Specifically, the burner power in the current market is generally too large to be applied to ceramic shuttle kilns; moreover, the current burners cannot effectively control the high-temperature point of the flame, resulting in too high flame temperature and too wide fire channels, wasting the space inside the kiln and being unfavorable for ceramic forming. In addition, the temperature at the nozzle mouth of the current burner is too high, leading to a reduced service life of the nozzle, increasing the consumption of consumables and the maintenance cost, and being unfavorable for long-term use. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a shuttle kiln natural gas pure oxygen burner and a shuttle kiln, which can effectively control the combustion power, increase the convective heat transfer intensity, and reduce the temperature of the core flame to be applicable to ceramic firing.

[0006] To solve the above technical problem, the present invention provides a shuttle kiln natural gas pure oxygen burner, including a primary gas transmission channel, a secondary gas transmission channel, and a sleeve. The primary gas transmission channel is sleeved in the secondary gas transmission channel, and there is a preset distance between the inner wall of the secondary gas transmission channel and the outer wall of the primary gas transmission channel;

[0007] The sleeve is provided with an ignition section, a contraction section, and an outlet section. The ignition section is connected to the outlet section through the contraction section, and the outlet section is connected to the outside. The primary gas transmission channel is connected to the ignition section through the secondary gas transmission channel;

[0008] An air inlet hole is provided at the connection between the ignition section and the secondary gas transmission channel to enable the ignition section to be connected to the outside through the air inlet hole. The diameter of the contraction section gradually decreases from the connection between the contraction section and the ignition section towards the outlet section, so that the air pressure in the outlet section is lower than the external air pressure.

[0009] Preferably, the shuttle kiln natural gas pure oxygen burner further includes a support base, the support base is provided with a groove, the sleeve passes through the support base into the groove, and a preset distance is provided between the sleeve and the groove, so that an air supply area is formed between the sleeve and the groove, and the air inlet hole is communicated with the air supply area.

[0010] Preferably, a connection platform is provided between the secondary gas transmission channel and the ignition section, the air inlet hole penetrates through the connection platform, and the discharge ports are arranged at intervals around the secondary gas transmission channel.

[0011] Preferably, a primary gas pipe for conveying natural gas is provided in the primary gas transmission channel, a primary combustion-supporting pipe for conveying air is provided on the primary gas transmission channel, the primary gas pipe is inserted into the ignition section, and the primary combustion-supporting pipe is communicated with the ignition section;

[0012] The position of the primary combustion-supporting pipe is offset from the position of the primary gas pipe.

[0013] Preferably, an ignition electrode tube is further provided in the primary gas transmission channel, the ignition electrode tube is inserted into the ignition section, and the outlet of the ignition electrode tube is arranged towards the outlet of the primary gas pipe;

[0014] A gap is provided between the ignition electrode tube and the primary gas pipe, and a gap is provided between the ignition electrode tube and the primary gas transmission channel, so that the primary combustion-supporting pipe is communicated with the ignition section through the gap.

[0015] Preferably, a limiting plate is further provided in the primary gas transmission channel, the primary gas pipe passes through the limiting plate into the ignition section, and air vent holes are provided on the limiting plate, and the air vent holes are communicated with the primary combustion-supporting pipe through the gap.

[0016] Preferably, the air vent holes include a first through hole and a second through hole, the first through hole is arranged around the primary gas pipe, and the second through hole is arranged around the first through hole and the primary gas pipe;

[0017] The second through hole is located at the edge of the limiting plate, and an inclined surface is provided in the second through hole, and the inclined surface is inclined in the clockwise or counterclockwise direction.

[0018] Preferably, the secondary gas transmission channel is provided with a secondary gas pipe for conveying natural gas and a secondary combustion-supporting pipe for conveying air, both the secondary gas pipe and the secondary combustion-supporting pipe are communicated with the ignition section, and the position of the secondary combustion-supporting pipe is offset from the position of the secondary gas pipe;

[0019] The secondary gas pipe is provided with an ignition end, which is inserted into the ignition section, and the insertion depth of the ignition end into the ignition section is greater than the insertion depth of the primary gas pipe into the ignition section.

[0020] Preferably, the ratio of natural gas conveyed by the primary gas pipe to air conveyed by the primary combustion-supporting pipe is 1:1 to 1:1.5; the ratio of natural gas conveyed by the secondary gas pipe to air conveyed by the secondary combustion-supporting pipe is 1:3 to 1:4.

[0021] The oxygen content rate of the air conveyed by the primary combustion-supporting pipe and the secondary combustion-supporting pipe is 90%-97%.

[0022] Correspondingly, the present invention provides a shuttle kiln, which includes a kiln wall and the above-mentioned shuttle kiln natural gas pure oxygen burner. The shuttle kiln natural gas pure oxygen burner is installed on the kiln wall, and the kiln wall is provided with a through hole. The shuttle kiln natural gas pure oxygen burner is connected to the inside of the shuttle kiln through the through hole.

[0023] Implementing the present invention has the following beneficial effects:

[0024] In the present invention, by providing a primary gas transmission channel, a secondary gas transmission channel and a sleeve, the primary gas transmission channel is sleeved in the secondary gas transmission channel, so that the gas conveyed by the primary gas transmission channel burns in the sleeve to form a core flame and generates primary combustion products; and the inner wall of the secondary gas transmission channel is separated from the outer wall of the primary gas transmission channel by a preset distance, so that the gas with a relatively high oxygen ratio conveyed by the secondary gas transmission channel will perform lean fuel combustion in the area around the core flame to generate secondary combustion products. The secondary combustion products will be entrained and carried by the core flame and form a firing flame with strong convective heat transfer ability outside the sleeve. At the same time, the temperature of the core flame in the sleeve is ensured to be stable and not too high, achieving the effects of effectively controlling the high-temperature point of the flame and effectively controlling the combustion power.

[0025] Furthermore, the sleeve is provided with an ignition section, a contraction section and a lead-out section. The ignition section is connected to the lead-out section through the contraction section, and the primary gas transmission channel is connected to the ignition section through the secondary gas transmission channel, so that the gases conveyed by the primary gas transmission channel and the secondary gas transmission channel can both burn in the ignition section. The lead-out section is connected to the outside, so that the core flame can burn towards the outside to form a firing flame.

[0026] Among them, an air inlet hole is provided at the connection between the ignition section and the secondary gas transmission channel, so that the ignition section is communicated with the outside through the air inlet hole, enabling external air to enter the ignition section through the air inlet hole; the diameter of the contraction section gradually decreases from the connection between the contraction section and the ignition section towards the direction of the export section to compress the gas and accelerate the gas flow rate, thereby reducing the air pressure in the contraction section to be lower than that in the ignition section, forming a low-pressure area. As a result, the external air entering through the air inlet hole will be adsorbed by the contraction section, enabling the external air to flow to the outside through the contraction section and the export section in sequence, and driving the primary combustion products and secondary combustion products remaining in the ignition section to flow towards the contraction section and the export section through the flow of the external air, so as to be heated and burned by the core flame, thereby forming a firing flame with stable state, reasonable temperature, moderate length, and strong convective heat transfer ability outside. Description of the Drawings

[0027] Figure 1 is a structural diagram of a shuttle kiln natural gas pure oxygen burner of the present invention;

[0028] Figure 2 is Figure 1 a cross-sectional view of the shown shuttle kiln natural gas pure oxygen burner;

[0029] Figure 3 is Figure 2 a partial enlarged view of the shown position A;

[0030] Figure 4 is Figure 1 a cross-sectional view of the shown shuttle kiln natural gas pure oxygen burner from another angle;

[0031] Figure 5 is Figure 1 a side view of the shown shuttle kiln natural gas pure oxygen burner;

[0032] Figure 6 is a structural diagram of the limit plate of the present invention. Detailed Description of the Invention

[0033] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. It is hereby declared that the orientation terms such as up, down, left, right, front, back, inside, and outside that appear or will appear in the text of the present invention are only based on the accompanying drawings of the present invention, and they do not specifically limit the present invention.

[0034] Combined with Figures 1 to 6 , the present invention provides a shuttle kiln natural gas pure oxygen burner, which includes a primary gas transmission channel 1, a secondary gas transmission channel 2, and a sleeve 3.

[0035] In the present invention, the primary gas transmission channel 1 is sleeved in the secondary gas transmission channel 2. The gas conveyed by the primary gas transmission channel 1 burns in the sleeve 3 to form a core flame and generate primary combustion products. Moreover, the inner wall of the secondary gas transmission channel 2 is separated from the outer wall of the primary gas transmission channel 1 by a preset distance, such that the gas with a relatively high oxygen proportion conveyed through the secondary gas transmission channel 2 undergoes lean fuel combustion in the area around the core flame, generating secondary combustion products. The secondary combustion products are entrained and carried by the core flame, and a firing flame with strong convective heat transfer ability is formed outside the sleeve 3. At the same time, the temperature of the core flame inside the sleeve 3 is stably maintained and will not be too high, achieving the effects of effectively controlling the high-temperature point of the flame and effectively controlling the combustion power.

[0036] Further, the sleeve 3 is provided with a ignition section 31, a contraction section 32, and an outlet section 33. The ignition section 31 is connected to the outlet section 33 through the contraction section 32, and the ignition section 31 is connected to both the primary gas transmission channel 1 and the secondary gas transmission channel 2, such that the gases conveyed by the primary gas transmission channel 1 and the secondary gas transmission channel 2 both burn in the ignition section 31. The outlet section 33 is connected to the outside, enabling the core flame to burn towards the outside so as to form a firing flame.

[0037] Among them, an air inlet hole 23 is provided at the connection between the ignition section 31 and the secondary gas transmission channel 2, enabling the ignition section 31 to be connected to the outside through the air inlet hole 23, such that external air can enter the ignition section 31 through the air inlet hole 23. The diameter of the contraction section 32 gradually decreases from the connection between the contraction section 32 and the ignition section 31 towards the outlet section 33 to compress the gas, accelerate the gas flow rate, thereby reducing the air pressure in the contraction section 32 to be lower than that in the ignition section 31, forming a low-pressure area. As a result, the external air entering through the air inlet hole 23 will be adsorbed by the contraction section 32, enabling the external air to flow to the outside through the contraction section 32 and the outlet section 33 in sequence, and driving the primary combustion products and secondary combustion products remaining in the ignition section 31 to flow towards the contraction section 32 and the outlet section 33 through the flow of the external air, so as to be heated and burned by the core flame, thereby forming a firing flame with stable state, reasonable temperature, moderate length, and strong convective heat transfer ability outside.

[0038] Specifically, in combination with Figures 1 to 4, to achieve the air supply effect, the shuttle kiln natural gas pure oxygen burner further includes a support base 4. The support base 4 is provided with a groove 41. The sleeve 3 passes through the support base 4 into the groove 41, and a preset distance is provided between the sleeve 3 and the groove 41, so that an air supply area is formed between the sleeve 3 and the groove 41. The air inlet hole 23 is communicated with the air supply area, so that the air located in the air supply area can flow into the ignition section 31 through the air inlet hole 23 to achieve the adsorption effect. And even if a part of the primary combustion products and secondary combustion products flow out from the air inlet hole 23, they will be limited within the air supply area, so as to ensure that the primary combustion products and secondary combustion products located in the air supply area can be guided by the air and return to the ignition section 31 through the air inlet hole 23 again to ensure the combustion effect.

[0039] As one of the embodiments, in combination with Figures 3 to 5 , since the diameter of the sleeve 3 is usually larger than that of the secondary gas transmission channel 2, therefore, a connecting platform 24 can be provided between the secondary gas transmission channel 2 and the ignition section 31 to connect the secondary gas transmission channel 2 with the ignition section 31. Among them, the air inlet hole 23 penetrates through the connecting platform 24. By arranging the air inlet hole 23 in an area with higher air pressure, it is convenient for external air to flow in. Further, the air inlet holes 23 can be arranged at intervals around the secondary gas transmission channel 2, so that external air can fully flow in to guide the primary combustion products and secondary combustion products to be fully burned by the core flame at the contraction section 32 and the ignition section 33, so as to further ensure the formation of a firing flame with strong convective heat transfer ability outside the sleeve 3.

[0040] Preferably, the shuttle kiln natural gas pure oxygen burner may further include a sealing plate 5. The sealing plate 5 is installed on the support base 4 to seal the gap between the sleeve 3 and the support base 4 to achieve the sealing effect. More preferably, the length of the outlet section 33 is less than the length of the contraction section 32 to facilitate the formation of a pressure difference to achieve the adsorption effect.

[0041] At the same time, in combination with Figures 2 to 4 , to form a core flame, a primary gas pipe 11 for transporting natural gas is provided in the primary gas transmission channel 1. A primary combustion-supporting pipe 12 for transporting air with a high oxygen content is provided on the primary gas transmission channel 1. The primary gas pipe 11 is inserted into the ignition section 31, and the primary combustion-supporting pipe 12 is communicated with the ignition section 31, so that natural gas and oxygen in the air can be mixed in the ignition section 31 and be ignited to form a core flame and generate primary combustion products. Among them, the position of the primary combustion-supporting pipe 12 is staggered from the position of the primary gas pipe 11, so that the air input by the primary combustion-supporting pipe 12 can also cool the gas channel and improve the product life.

[0042] Further, to ignite the mixed natural gas and oxygen, an ignition electrode tube 13 is also provided in the primary gas transmission channel 1. The ignition electrode tube 13 is inserted into the ignition section 31, and the outlet of the ignition electrode tube 13 is arranged towards the outlet of the primary gas pipe 11 to ignite the oxygen in the air and the mixed natural gas, and form a core flame at the outlet of the primary gas pipe 11 to ensure stable combustion. Among them, there is a gap between the ignition electrode tube 13 and the primary gas pipe 11, and there is a gap between the ignition electrode tube 13 and the primary gas transmission channel 1. The air entering from the primary combustion-supporting pipe 12 can communicate with the ignition section 31 through the gap, and the air entering from the primary combustion-supporting pipe 12 can also cool down and cool the ignition electrode tube 13 and the primary gas transmission channel 1. Preferably, a flame monitoring electrode tube 16 can also be arranged near the ignition electrode tube 13.

[0043] It should be noted that, to reduce the temperature of the core flame, the ratio of the natural gas conveyed by the primary gas pipe 11 to the air conveyed by the primary combustion-supporting pipe 12 is 1:1 to 1:1.5, so that the natural gas and oxygen mixture burns in a sub-stoichiometric ratio state, and the combustion temperature is lower than the theoretical combustion temperature (about 3000 °C), so that the core flame is an incomplete combustion, reducing the high-temperature points within the range of the core flame, making the core flame temperature distribution more uniform, and also reducing the influence of the high-temperature points on the service life of the sleeve 3 and the refractory material on the sleeve 3, achieving the effect of effectively controlling the core flame and effectively controlling the combustion power.

[0044] In addition, combined with Figures 2 to 6 , to ensure the structural stability, a limiting plate 14 is also provided in the primary gas transmission channel 1. The primary gas pipe 11 passes through the limiting plate 14 and extends into the ignition section 31, and the limiting plate 14 is provided with ventilation holes 15. The ventilation holes 15 are communicated with the primary combustion-supporting pipe 12 through the gap.

[0045] Among them, the ventilation holes 15 include a first through hole 151 and a second through hole 152. The first through hole 151 is arranged around the primary gas pipe 11, so that the natural gas conveyed by the primary gas pipe 11 can be evenly mixed with the oxygen in the air output from the surrounding first through holes 151; the second through hole 152 is arranged around the first through hole 151 and the primary gas pipe 11 to increase the swirl and make the mixing of natural gas and oxygen more uniform. Preferably, an inclined surface 153 is provided in the second through hole 152, and the inclined surface 153 is inclined in the clockwise or counterclockwise direction to form a swirl. More preferably, the second through hole 152 can be located at the edge of the limiting plate 14 to provide sufficient space for the formation of the swirl.

[0046] On the other hand, combined with Figures 2 to 5, to further form a firing flame with strong convective heat transfer ability, the secondary gas supply channel 2 is provided with a secondary gas burner pipe 21 for transporting natural gas and a secondary combustion air pipe 22 for transporting air with a high oxygen content. Both the secondary gas burner pipe 21 and the secondary combustion air pipe 22 are connected to the ignition section 31, enabling lean fuel combustion at the secondary gas burner pipe 21 and generating secondary combustion products. Among them, a part of the secondary combustion products will be burned by the core flame together with the primary combustion products in the sleeve 3, and the other part of the primary combustion products and secondary combustion products discharged to the outside will be adsorbed back to the outlet section 33 and thus also be ignited by the core flame, so as to form a firing flame with strong convective heat transfer ability outside the sleeve 3.

[0047] Preferably, an ignition end 211 is provided on the secondary gas burner pipe 21. The ignition end 211 is inserted into the ignition section 31, and the natural gas output from the secondary gas burner pipe 21 is output towards the ignition section 31 via the ignition end 211. After the natural gas is mixed with oxygen, it will be directly ignited to generate secondary combustion products. Among them, the depth of the ignition end 211 inserted into the ignition section 31 is greater than the depth of the primary gas burner pipe 11 inserted into the ignition section 31, so as to facilitate the secondary combustion products being entrained by the core flame and more easily generate a firing flame with strong convective heat transfer ability. More preferably, the secondary combustion air pipe 22 is staggered from the secondary gas burner pipe 21 to facilitate gas mixing and help the secondary combustion air pipe 22 cool the secondary gas burner pipe 21.

[0048] In addition, to achieve lean fuel combustion, the ratio of the natural gas transported by the secondary gas burner pipe 21 to the air with a high oxygen content transported by the secondary combustion air pipe 22 is 1:3 to 1:4, with less natural gas and more air to ensure that the combustion temperature at the secondary gas burner pipe 21 is lower than its peak temperature.

[0049] It should be noted that to further achieve incomplete combustion of the core flame and lean fuel combustion at the secondary gas supply channel 2, the oxygen content of the air transported by the primary combustion air pipe 12 and the secondary combustion air pipe 22 is 90%-97%. By increasing the oxygen content in the air, it is ensured that the combustion temperature will not reach the peak temperature. Among them, the primary combustion products and secondary combustion products are mainly convective high-temperature gases formed after the combustion of natural gas and oxygen, and the main components of the high-temperature gases are volatile substances such as carbon dioxide, water vapor, and oxygen.

[0050] In addition, the present invention also provides a shuttle kiln, including a kiln wall and the above-mentioned shuttle kiln natural gas pure oxygen burner. The shuttle kiln natural gas pure oxygen burner is installed on the kiln wall through the support seat 4, and the kiln wall is provided with a through hole. The groove 41 of the shuttle kiln natural gas pure oxygen burner and the sleeve 3 can communicate with the inside of the shuttle kiln through the through hole, so that the firing flame can lead to the inside of the shuttle kiln.

[0051] The working principle of the present invention is as follows:

[0052] First, the industrial control computer conveys natural gas and oxygen with high oxygen content to the primary gas pipeline 11. The natural gas and oxygen will be mixed in the combustion section and ignited to form a core flame and generate primary combustion products.

[0053] Subsequently, the industrial control computer conveys natural gas and oxygen with high oxygen content to the secondary gas pipeline 21, enabling lean fuel combustion in the area around the core flame and generating secondary combustion products.

[0054] The ignition section 31 is connected to the outside through the air inlet hole 23, so that the primary combustion products and the secondary combustion products can be transported to the outside through the air inlet hole 23; the diameter of the contraction section 32 gradually decreases from the connection between the contraction section 32 and the ignition section 31 towards the direction of the outlet section 33 to compress the gas and accelerate the gas flow rate, thereby reducing the air pressure in the contraction section 32 and the outlet section 33 to be lower than the external air pressure, forming an air pressure difference, so that the primary combustion products, the secondary combustion products and the external air will move towards the outlet section 33 and be adsorbed into the outlet section 33 to be heated and burned by the core flame, further forming a firing flame with stable state, reasonable temperature, moderate length and strong convective heat transfer ability.

[0055] The above is the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of the present invention.

Claims

1. A shuttle kiln natural gas pure oxygen burner, characterized in that It includes a primary gas delivery channel, a secondary gas delivery channel and a sleeve. The primary gas delivery channel is sleeved in the secondary gas delivery channel, and there is a preset distance between the inner wall of the secondary gas delivery channel and the outer wall of the primary gas delivery channel; The sleeve is provided with an ignition section, a contraction section and a lead-out section. The ignition section is connected to the lead-out section through the contraction section, and the lead-out section is connected to the outside. The primary gas delivery channel is connected to the ignition section through the secondary gas delivery channel; An air inlet hole is provided at the connection between the ignition section and the secondary gas delivery channel. The ignition section is connected to the outside through the air inlet hole; the diameter of the contraction section gradually decreases from the connection between the contraction section and the ignition section towards the lead-out section, so that the air pressure in the contraction section is lower than the air pressure in the ignition section; The shuttle kiln natural gas pure oxygen burner further includes a support seat. The support seat is provided with a groove. The sleeve passes through the support seat into the groove, and there is a preset distance between the sleeve and the groove, so that a gas supply area is formed between the sleeve and the groove. The air inlet hole is connected to the gas supply area; A primary gas pipe for transporting natural gas is arranged in the primary gas delivery channel, and a primary combustion-supporting pipe for transporting air is arranged on the primary gas delivery channel. The primary gas pipe is inserted into the ignition section, and the primary combustion-supporting pipe is connected to the ignition section; The secondary gas delivery channel is provided with a secondary gas pipe for transporting natural gas and a secondary combustion-supporting pipe for transporting air. Both the secondary gas pipe and the secondary combustion-supporting pipe are connected to the ignition section; The position of the primary combustion-supporting pipe is staggered from the position of the primary gas pipe; An ignition electrode pipe is further arranged in the primary gas delivery channel. The ignition electrode pipe is inserted into the ignition section, and the ignition electrode pipe is arranged towards the primary gas pipe; There is a gap between the ignition electrode pipe and the primary gas pipe, and there is a gap between the ignition electrode pipe and the primary gas delivery channel, so that the primary combustion-supporting pipe is connected to the ignition section through the gap; A limiting plate is further arranged in the primary gas delivery channel. The primary gas pipe passes through the limiting plate into the ignition section, and the limiting plate is provided with a ventilation hole. The ventilation hole is connected to the primary combustion-supporting pipe through the gap; 2. The shuttle kiln natural gas pure oxygen burner according to claim 1, characterized in that, A connection platform is arranged between the secondary gas delivery channel and the ignition section. The air inlet hole penetrates through the connection platform, and the air inlet holes are arranged at intervals around the secondary gas delivery channel; 3. The shuttle kiln natural gas pure oxygen burner according to claim 1, characterized in that, The ventilation hole includes a first through hole and a second through hole. The first through hole is arranged around the primary gas pipe, and the second through hole is arranged around the first through hole and the primary gas pipe; The second through hole is located at the edge of the limiting plate, and an inclined surface is arranged in the second through hole. The inclined surface is inclined in the clockwise or counterclockwise direction; 4. The shuttle kiln natural gas pure oxygen burner according to claim 1, characterized in that The position of the secondary combustion-supporting pipe is staggered from the position of the secondary gas pipe; An ignition end is arranged on the secondary gas pipe. The ignition end is inserted into the ignition section, and the depth of the ignition end inserted into the ignition section is greater than the depth of the primary gas pipe inserted into the ignition section.

5. The shuttle kiln natural gas pure oxygen burner according to claim 4, characterized in that, The ratio of the natural gas conveyed by the primary gas pipe to the air conveyed by the primary combustion-supporting pipe is 1:1 to 1:1.5; the ratio of the natural gas conveyed by the secondary gas pipe to the air conveyed by the secondary combustion-supporting pipe is 1:3 to 1:4; The oxygen content rate of the air conveyed by the primary combustion-supporting pipe and the secondary combustion-supporting pipe is 90% - 97%.

6. A shuttle kiln, characterized in that, It includes a kiln wall and a shuttle kiln natural gas pure oxygen burner as described in any one of claims 1-5. The shuttle kiln natural gas pure oxygen burner is installed on the kiln wall, and the kiln wall is provided with a through hole. The shuttle kiln natural gas pure oxygen burner is connected to the inside of the shuttle kiln through the through hole.

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