Hydrogen spray gun and hydrogen spray gun combustion system

Abstract

The invention relates to the technical field of float glass melting furnaces, in particular to a hydrogen spray gun and a hydrogen spray gun combustion system.The hydrogen spray gun comprises a spray gun middle pipe, a spray gun inner pipe and a spray gun outer pipe, the spray gun middle pipe is composed of a bent pipe section and a straight pipe section which are integrally formed, the bent pipe section is a hydrogen pipe connecting end and provided with a pipe inserting opening, and the tail end of the straight pipe section is a spray gun nozzle; one end of the spray gun inner pipe is an inner pipe nozzle, and the other end of the spray gun inner pipe serves as an oxygen pipe connecting end and extends out of the pipe inserting opening; the spray gun outer pipe covers the outer wall of the straight pipe section of the middle pipe, the spray gun nozzle extends out of the closed end, and the other end is a mixed gas connecting pipe end; an air guide hole is formed in the middle pipe close to the nozzle, so that the middle pipe is communicated with the outer pipe. Through the collaborative design of the movable inner pipe and the gas guide holes, the mixing state of hydrogen and combustion-supporting gas and the flame form are flexibly adjusted, and flame radiation and heating efficiency are enhanced while zero-carbon combustion is kept.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of float glass melting furnace, in particular to a hydrogen gas lance and a hydrogen gas lance combustion system. BACKGROUND

[0002] As the core thermal equipment for glass production, the performance of the combustion system of the float glass melting furnace directly affects the production energy consumption, glass quality and environmental emissions. At present, the melting furnace generally adopts the lance combustion technology mainly using traditional fossil fuels such as natural gas and heavy oil. This kind of technology has high maturity and relatively stable operation, but it will release a large amount of carbon dioxide and easily produce nitrogen oxides and other pollutants due to local high temperature or uneven mixing during combustion, which is difficult to meet the strict requirements of current green manufacturing and low-carbon development.

[0003] In order to reduce carbon emissions, hydrogen energy as a zero-carbon fuel has gradually attracted attention, and the corresponding hydrogen gas special-purpose lance technology has also been developed. Hydrogen combustion only generates water, which has significant environmental advantages, but its application in glass melting furnaces still has the following defects: 1) The hydrogen flame has low blackness, weak radiation heat transfer ability, and the flame shape is short and rigid, making it difficult to achieve uniform coverage and efficient heating of the glass liquid surface; 2) The existing hydrogen gas lance device is often complex in structure, high in manufacturing cost, and completely dependent on high-flow hydrogen, resulting in a substantial increase in operating costs, poor economy and practicability.

[0004] The above reasons make it difficult for the existing hydrogen combustion technology to balance the thermal performance and economy in the glass melting furnace, restricting its large-scale popularization and application. SUMMARY

[0005] In order to solve the above technical problems, the present application provides a technical scheme of a hydrogen gas lance and a hydrogen gas lance combustion system.

[0006] The technical problems solved by the present application can be realized by the following technical scheme: A hydrogen gas lance, comprising: A lance intermediate pipe, the lance intermediate pipe comprising an integrally formed elbow pipe section and a straight pipe section, the elbow pipe section serving as a hydrogen gas connection pipe end and being provided with a pipe insertion port, and the straight pipe section having a lance nozzle at one end away from the elbow pipe section; A lance inner pipe, the lance inner pipe being a straight pipe and movably penetrating the inside of the lance intermediate pipe; one end of the lance inner pipe close to the lance nozzle serving as an inner pipe nozzle, and the other end serving as an oxygen gas connection pipe end and extending out of the lance intermediate pipe through the pipe insertion port; The spray gun outer tube is a sleeve closed at one end, covering the outer wall of the straight section of the spray gun middle tube; the closed end of the spray gun outer tube is provided with a through hole, and the spray gun nozzle of the spray gun middle tube extends out from the through hole; the end of the spray gun outer tube near the curved section of the spray gun middle tube is the mixing gas connection end. An air guide hole is provided on the pipe wall of the spray gun intermediate tube near the spray gun nozzle so that the annular space between the spray gun intermediate tube and the spray gun outer tube is connected.

[0007] Preferably, a spray gun slot guide rail is provided inside the middle tube of the spray gun and in the area near the inner tube nozzle, and the inner tube nozzle is engaged in the spray gun slot guide rail.

[0008] Preferably, it also includes a flame adjustment component, which includes a scale value for the inner tube of the spray gun and an adjustment button for the inner tube of the spray gun, and is located at the oxygen inlet end of the inner tube of the spray gun, for driving the inner tube of the spray gun to move along the guide rail of the spray gun slot.

[0009] Preferably, it also includes a spray gun cap, which is a hollow structure, fitted onto the spray gun nozzle, and covering the sealed end of the spray gun outer tube.

[0010] Preferably, a sealing gasket is provided at the insertion port.

[0011] Preferably, the air intake direction of the mixing gas inlet end of the spray gun outer tube is arranged vertically.

[0012] A hydrogen spray gun combustion system is also provided, comprising a hydrogen spray gun as described above, and further comprising: An oxygen supply line is connected to the oxygen connector end of the inner tube of the spray gun, and is used to introduce combustion-supporting oxygen to adjust the flame shape and promote the complete combustion of hydrogen. A hydrogen supply pipeline is connected to the hydrogen inlet of the spray gun's intermediate tube for introducing the main fuel hydrogen. A mixed gas supply pipeline is connected to the mixed gas inlet end of the outer pipe of the spray gun for introducing mixed gas, which includes natural gas and ammonia; wherein, the natural gas is used for cracking and carbon enrichment, and the ammonia is used for reducing nitrogen oxides; Multiple compressed air cooling lines are provided, each of which is connected to the oxygen supply line, hydrogen supply line, and mixed gas supply line, and is used to supply compressed air to each layer of the spray gun for cooling during non-combustion periods.

[0013] Preferably, the oxygen supply pipeline, hydrogen supply pipeline and mixed gas supply pipeline are each equipped with a first type of control valve group, and the compressed air cooling pipeline is equipped with a second type of control valve group; The first type of control valve group is configured in conjunction with the second type of control valve group to adjust the flame length, enhance radiative heat transfer, and reduce nitrogen oxide emissions by controlling the on / off state and flow rate of gas in the corresponding pipelines.

[0014] Preferably, the first type of control valve assembly includes: The regulating valve, connected to the corresponding connector of the spray gun via a hose, is used to regulate the flow rate of gas in the pipeline; A check valve, connected to the regulating valve via a distribution pipe, is used to prevent gas backflow. A ball valve, connected to the check valve, is used to cut off the gas supply.

[0015] Preferably, the second type of control valve assembly includes: A compressed air flange, connected to the distribution pipe via a compressed air hose, is used to connect to a compressed air source and distribute cooling air to various pipelines; A compressed air check valve, connected to the compressed air flange, is used to prevent compressed air backflow; A compressed air ball valve, connected to the compressed air check valve, is used to cut off the cooling air source.

[0016] Beneficial effects: Through the coordinated design of the movable inner tube and the gas guide hole, this invention achieves flexible adjustment of the mixing degree of hydrogen and combustion-supporting gas and the flame shape. While retaining the environmentally friendly advantage of zero carbon emissions from hydrogen combustion, this design effectively enhances the flame coverage and radiative heat transfer capacity, thereby significantly improving heating efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is an enlarged view of the nozzle region of the present invention; Figure 3 This is an enlarged view of the structure of the flame adjustment assembly of the present invention.

[0018] Explanation of reference numerals in the attached diagram: 1. Spray gun guide rail; 2. Spray gun cap; 3. Spray gun air guide hole; 4. Spray gun inner tube; 41. Insertion port; 5. Spray gun outer tube; 51. Inner tube nozzle; 6. Spray gun intermediate tube; 7. Sealing gasket; 8. Spray gun inner tube scale value; 9. Spray gun inner tube adjustment button; 10. Oxygen hose; 101. Oxygen regulating valve; 102. Oxygen distribution pipe; 103. Oxygen check valve; 104. Oxygen ball valve; 11. Hydrogen... 111. Hydrogen regulating valve; 112. Hydrogen distribution pipe; 113. Hydrogen check valve; 114. Hydrogen balloon valve; 12. Mixed gas hose; 121. Mixed gas regulating valve; 122. Mixed gas distribution pipe; 123. Mixed gas check valve; 124. Mixed gas balloon valve; 13. Compressed air hose; 131. Compressed air flange; 132. Compressed air check valve; 133. Compressed air ball valve; 14. Spray gun nozzle. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of the invention.

[0022] Reference Figure 1 The present invention provides a hydrogen spray gun, comprising: The spray gun intermediate tube 4 includes an integrally formed bent section and a straight section. The bent section serves as the hydrogen connection end and is provided with an insertion port 41. The end of the straight section away from the bent section is the spray gun nozzle 14. The inner tube 5 of the spray gun is a straight tube that is movably inserted inside the middle tube 4 of the spray gun. One end of the inner tube 5 near the nozzle 14 of the spray gun is the inner tube nozzle 51, and the other end extends out of the middle tube 4 of the spray gun through the insertion port 41 as the oxygen connection end. The spray gun outer tube 6 is a sleeve with one end closed, covering the outer wall of the straight section of the spray gun intermediate tube 4; the closed end of the spray gun outer tube 6 is provided with a through hole, and the spray gun nozzle 14 of the spray gun intermediate tube 4 extends out from the through hole; the end of the spray gun outer tube 6 near the curved section of the spray gun intermediate tube 4 is the mixing gas connection end. An air guide hole 3 is provided on the pipe wall of the spray gun intermediate tube 4 near the spray gun nozzle 14 so that the annular space between the spray gun intermediate tube 4 and the spray gun outer tube 6 is connected.

[0023] Specifically, in this embodiment of the invention, in response to the problems of low flame emissivity, poor radiative heat transfer capacity, short and rigid flame shape of pure hydrogen combustion, as well as the high operating cost and easy generation of local high temperature nitrogen oxides of traditional all-hydrogen combustion, the technical defects of single hydrogen fuel combustion are avoided by using three-layer sleeve coordinated gas supply and flame staged control. This achieves efficient radiative heat transfer, flexible adjustment of flame shape and reduction of pollutant emissions at the source, while significantly reducing hydrogen dependence and operating costs.

[0024] Specifically, the spray gun structure adopts a three-layer concentric sleeve design, which includes an inner spray gun tube 5, a middle spray gun tube 4, and an outer spray gun tube 6 from the inside out. The inner spray gun tube 5 is nested inside the middle spray gun tube 4 and can move axially within a certain range to precisely adjust the oxygen spray position and the mixing intensity of hydrogen, thereby optimizing the flame shape and extending the flame length. This solves the problems of short flame and uneven heating in pure hydrogen combustion. At the same time, the internal oxygen supply reduces the amount of combustion air used, reduces exhaust heat loss, achieves energy saving, and extends the kiln life.

[0025] The outer pipe 6 of the spray gun is firmly welded to the straight section of the middle pipe 4 of the spray gun, forming an annular mixed gas channel for inputting the premixed gas of natural gas and ammonia. The inlet of the mixed gas pipe end is designed vertically, which facilitates pipe connection and provides sufficient premixing and cracking reaction time for the mixed gas. In a high-temperature and oxygen-deficient environment, the cracking of natural gas produces carbon black particles, which enhance the flame radiation heat transfer capacity and compensate for the low blackness of pure hydrogen flames. At the same time, by precisely controlling the excess ammonia coefficient, it reacts with the nitrogen oxides already generated in the kiln to achieve nitrogen oxide (NOx) emission reduction at the source and partially replace hydrogen to reduce fuel costs.

[0026] Additionally, refer to Figure 1 and Figure 2 In the area near the nozzle 14 of the spray gun, a ring of air guide holes 3 is evenly opened along the circumference of the middle tube 4 of the spray gun to ensure that the mixed gas (natural gas and ammonia) is evenly introduced into the main flame area, thereby participating in the generation of carbon black to enhance radiation and achieve NOx reduction.

[0027] Furthermore, the diameters of the inner tube 5, the intermediate tube 4, and the outer tube 6 of the spray gun can be set to approximately DN15, DN65, and DN100, respectively. This size configuration ensures a high injection velocity of the central oxygen flow, a large-capacity supply of the main hydrogen flow, and a stable coverage of the outer layer of mixed gas, thus providing a structural basis for achieving efficient, stable, and controllable staged combustion.

[0028] In a preferred embodiment of the present invention, a spray gun slot guide rail 1 is provided in the area inside the spray gun intermediate tube 4 and near the inner tube nozzle 51, and the inner tube nozzle 51 is engaged in the spray gun slot guide rail 1.

[0029] Specifically, in the embodiments of the present invention, reference is made to... Figure 2 The straight section of the spray gun's intermediate tube 4, away from the curved section, serves as the spray gun nozzle 14 and is designed as a conical structure. To adapt to different process requirements, a ring-shaped spray gun slot guide rail 1 is coaxially arranged within this conical structure.

[0030] Correspondingly, the inner tube nozzle 51 of the spray gun inner tube 5 is also configured with a matching conical structure, and its cone tip extends into a cylindrical structure; the cylindrical structure is precisely engaged in the spray gun slot guide rail 1, so that the spray gun inner tube 5 can be precisely guided when moving axially, and always maintains concentricity with the spray gun middle tube 4.

[0031] This precise fit structure mechanically constrains the radial runout of the inner tube, ensuring not only the stability and predictability of the mixing of the central oxygen flow and the main hydrogen flow at the outlet, laying the structural foundation for precise control of the flame pattern, but also avoiding airflow scouring, vibration, or component wear caused by misalignment, thereby improving the reliability and service life of the spray gun.

[0032] As a preferred embodiment of the present invention, a flame adjustment component is also included. The flame adjustment component includes a spray gun inner tube scale value 8 and a spray gun inner tube adjustment button 9, which is disposed at the oxygen inlet end of the spray gun inner tube 5 and is used to drive the spray gun inner tube 5 to move along the spray gun slot guide rail 1.

[0033] Specifically, in the embodiments of the present invention, reference is made to... Figure 1 and Figure 3 The flame adjustment assembly includes a threaded collar fixed to the inner tube 5 of the spray gun. The inner tube adjustment button 9 of the spray gun is screwed into this collar as a screw. When the adjustment button 9 is rotated, its top end abuts against the wall of the curved section of the middle tube 4 of the spray gun as a force fulcrum. Through threaded transmission, the inner tube 5 of the spray gun with the collar fixed is driven to produce a precise axial displacement.

[0034] At the same time, the scale value 8 of the inner tube of the spray gun is clearly marked on the outer wall of the inner tube 5 of the spray gun, corresponding to the baseline on the fixing collar. The operator can intuitively read the displacement of the inner tube and realize quantitative and repeatable precise adjustment of the flame pattern.

[0035] As a preferred embodiment of the present invention, it also includes a spray gun cap 2, which is a hollow structure, sleeved on the spray gun nozzle 14, and covers the sealed end of the spray gun outer tube 6.

[0036] Specifically, since the spray gun nozzle 14 is exposed to a high-temperature environment for a long time, in order to protect its end structure, stabilize the outlet airflow, and prevent backfire, in this embodiment of the invention, refer to Figure 1 and Figure 2 The spray gun cap 2 is made of high-temperature resistant alloy, and its hollow internal structure matches the conical outlet section of the spray gun nozzle 14.

[0037] The spray gun cap 2 is tightly fitted onto the outside of the spray gun nozzle 14 by means of threaded connection or interference fit, and its tail end is completely covered and sealed to the sealed end of the spray gun outer tube 6.

[0038] This design not only provides physical protection for the core nozzle, but also ensures, through a sealed fit with the outer tube 6, that the outer layer of mixed gas flowing out from the air guide hole 3 is completely guided in front of the nozzle, effectively maintaining the stable shape of the flame and combustion efficiency.

[0039] In a preferred embodiment of the present invention, a sealing gasket 7 is provided at the insertion port 41.

[0040] Specifically, considering that the inner tube 5 of the spray gun needs to reciprocate at the insertion port 41 to adjust the flame, and at the same time it is necessary to strictly prevent the high-pressure hydrogen gas in the intermediate tube 4 of the spray gun from leaking from here, in this embodiment of the invention, referring to Figure 1 A sealing gasket 7 is installed between the insertion port 41 and the inner tube 5 of the spray gun. This sealing gasket 7 is made of high-temperature resistant and wear-resistant flexible graphite or metal winding material, which can adapt to the axial displacement of the inner tube and the high-temperature working environment while ensuring dynamic sealing effect. In addition, this sealing structure design facilitates maintenance and replacement. When the seal wears due to long-term use, the sealing gasket 7 can be replaced separately without disassembling the entire spray gun system, which significantly reduces maintenance costs and downtime.

[0041] Reference Figure 1 The present invention also provides a hydrogen spray gun combustion system, comprising a hydrogen spray gun as described above, and further comprising: Oxygen supply line A is connected to the oxygen connector end of the inner tube 5 of the spray gun, and is used to introduce combustion-supporting oxygen to adjust the flame shape and promote the complete combustion of hydrogen. Hydrogen supply line B is connected to the hydrogen connection end of the spray gun intermediate pipe 4 and is used to introduce the main fuel hydrogen. The mixed gas supply pipeline C is connected to the mixed gas inlet end of the outer pipe 6 of the spray gun, and is used to introduce mixed gas, which includes natural gas and ammonia; wherein, the natural gas is used for cracking and carbonization, and the ammonia is used for reducing nitrogen oxides; Multiple compressed air cooling pipes D are provided, each of which is connected to the oxygen supply pipe A, the hydrogen supply pipe B, and the mixed gas supply pipe C, respectively, and are used to supply compressed air to each layer of the spray gun for cooling during non-combustion periods.

[0042] Specifically, in this embodiment of the invention, a collaborative combustion system is constructed by precisely connecting the aforementioned four functional pipelines to a three-layer sleeve-type spray gun. This system comprises three independent compressed air cooling pipelines D, which together constitute a complete compressed air cooling system. The system adopts a parallel branch design, with each process gas pipeline (A, B, C) independently configured with a compressed air cooling pipeline D. This one-to-one parallel design ensures that, when the cooling mode is activated, compressed air can be independently and synchronously delivered to the inner, middle, and outer pipes of the spray gun, achieving comprehensive, uniform, and efficient cooling of the three layers of piping.

[0043] Specifically, during the combustion period, three gas supply pipelines (A, B, and C) supply gas to the spray gun according to a preset ratio. Through the unique structure of the spray gun, staged mixing and combustion are achieved at the outlet, thereby forming an optimized flame with strong radiation, controllable length, and low pollutant generation in the kiln. During non-combustion periods such as shutdown or maintenance, the system switches to cooling mode. Room temperature compressed air is blown into each layer of pipes through compressed air cooling pipeline D. This airflow can effectively remove residual combustible gas in the pipes, ensuring safety. At the same time, the heat accumulated at the spray gun head is dissipated through convection heat exchanger, preventing the spray gun from being damaged due to overheating, thus ensuring the long-term safe operation and lifespan of the equipment.

[0044] In a preferred embodiment of the present invention, a first type of control valve group is provided on the oxygen supply pipeline A, the hydrogen supply pipeline B and the mixed gas supply pipeline C, and a second type of control valve group is provided on the compressed air cooling pipeline D. The first type of control valve group is configured in conjunction with the second type of control valve group to adjust the flame length, enhance radiative heat transfer, and reduce nitrogen oxide emissions by controlling the on / off state and flow rate of gas in the corresponding pipelines.

[0045] Specifically, in this embodiment of the invention, the first type of control valve group and the second type of control group work together through a central control system to construct a complete combustion and cooling control logic.

[0046] Under normal combustion conditions, the first type of control valve group independently and precisely adjusts the flow rates of each process gas according to preset process parameters. Among them, the oxygen flow rate determines the flame shape and length, the hydrogen flow rate ensures the basic heat load, and the mixture ratio simultaneously optimizes the radiative heat transfer and nitrogen oxide reduction effect.

[0047] When the system needs to switch to cooling mode, the central control system first cuts off all process gas supplies according to a predetermined program, and then automatically starts the compressed air cooling system.

[0048] This orderly and coordinated control mechanism not only ensures the airtight safety of the mode switching process and avoids the risk of gas crosstalk, but also achieves comprehensive optimization of flame characteristics and emission performance through precise management of multi-parameter coupling, ultimately achieving energy conservation and emission reduction goals while ensuring thermal performance.

[0049] In a preferred embodiment of the present invention, the first type of control valve assembly includes: The regulating valve, connected to the corresponding connector of the spray gun via a hose, is used to regulate the flow rate of gas in the pipeline; A check valve, connected to the regulating valve via a distribution pipe, is used to prevent gas backflow. A ball valve, connected to the check valve, is used to cut off the gas supply.

[0050] Specifically, in order to achieve precise control and safety interlocking of three process gases (oxygen, hydrogen, and a mixture), in this embodiment of the invention, reference is made to... Figure 1 The first type of control valve group adopts a modular design, with ball valve, check valve and regulating valve arranged sequentially along the gas flow direction.

[0051] Taking oxygen supply pipeline A as an example, its control valve group consists of the following components connected in series according to the gas flow path: oxygen ball valve 104 → oxygen check valve 103 → oxygen distribution pipe 102 → oxygen regulating valve 101 → oxygen hose 10. The components are functionally connected through this series structure, specifically as follows: Oxygen ball valve 104 serves as the main gas source shut-off valve at the beginning of the pipeline, used for rapid isolation of the gas source during equipment maintenance or emergencies. The oxygen check valve 103 is directly connected downstream of the oxygen ball valve 104. It can automatically prevent gas backflow and effectively avoid oxygen backflow caused by pressure fluctuations, thus fundamentally eliminating the risk of backfire. The inlet end of the oxygen distribution pipe 102 is connected to the oxygen check valve 103, and the outlet end is connected to the oxygen regulating valve 101, which serves to integrate the flow channels and stabilize the pressure. The oxygen regulating valve 101 is located closest to the spray gun. Its inlet is connected to the oxygen distribution pipe 102 and its outlet is connected to the oxygen hose 10. It is used to receive control signals and precisely regulate the oxygen flow to the inner tube 5 of the spray gun. It is the core actuator for achieving precise control of the flame pattern. The oxygen hose 10 is connected between the outlet of the oxygen regulating valve 101 and the oxygen inlet port of the spray gun inner tube 5. Its flexibility facilitates the fine adjustment and installation of the spray gun.

[0052] The valve assembly configuration and connection relationship of hydrogen supply line B and mixed gas supply line C are completely consistent with those of oxygen supply line A. Specifically, hydrogen supply line B is connected in series with hydrogen balloon valve 114, hydrogen check valve 113, hydrogen distribution pipe 112, hydrogen regulating valve 111, and hydrogen hose 11, and finally connected to the hydrogen connection port of the spray gun intermediate pipe 4; mixed gas supply line C is connected in series with mixing balloon valve 124, mixed gas check valve 123, mixed gas distribution pipe 122, mixed gas regulating valve 121, and mixed gas hose 12, and finally connected to the mixed gas connection port of the spray gun outer pipe 6.

[0053] This modular and standardized valve configuration not only ensures the accuracy and independence of each gas path control, but also creates multiple safety barriers through the synergy of check valves and ball valves, ensuring the efficient and safe operation of the entire combustion system.

[0054] As a preferred embodiment of the present invention, the second type of control valve assembly includes: The compressed air flange 131 is connected to the distribution pipe via the compressed air hose 13, and is used to connect to the compressed air source and distribute the cooling air to each pipeline. A compressed air check valve 132 is connected to the compressed air flange 131 to prevent compressed air backflow; The compressed air ball valve 133 is connected to the compressed air check valve 132 and is used to cut off the cooling air source.

[0055] Specifically, since it is necessary to effectively cool the spray gun during non-combustion periods and prevent the cooling gas from interfering with the process gas, in this embodiment of the invention, reference is made to... Figure 1 The system also includes a second type of control valve assembly on each compressed air cooling pipeline D. This second type of control valve assembly consists of a compressed air ball valve 133, a compressed air check valve 132, and a compressed air flange 131 connected in series along the airflow direction, forming an independently controllable cooling air path. The compressed air ball valve 133 acts as the main air source switch for rapid on / off switching, the compressed air check valve 132 strictly prevents process gas backflow, and the compressed air flange 131 ensures reliable connection to the external air source and system integration.

[0056] Furthermore, referring to Figure 1 Each compressed air cooling pipeline D is connected to a dedicated air inlet on the distribution pipe (oxygen distribution pipe 102, hydrogen distribution pipe 112, mixed gas distribution pipe 122) in the corresponding gas supply pipeline via a compressed air hose 13 at its end, so as to realize the safe convergence of the cooling gas pipeline and the process gas pipeline downstream of the valve group.

[0057] Specifically, when the kiln is switched or shut down, the compressed air ball valve 133 is opened, and the cooling airflow flows sequentially through the compressed air check valve 132 and the compressed air hose 13, enters from the dedicated interface of the distribution pipe, and blows back to the corresponding pipe of the spray gun, so as to achieve rapid cooling of the gun body from the inside to the outside and removal of residual combustible gases. This integrated design effectively improves the operational safety and maintenance convenience of the system while ensuring the uniformity of cooling.

[0058] In summary, this invention provides a hydrogen lance and a hydrogen lance combustion system. Through an innovative three-layer sleeve structure design, staged combustion organization, and multi-medium coordinated control technology, it achieves efficient, clean, and stable application of hydrogen fuel in glass melting furnaces. Compared with existing technologies, this invention not only successfully solves the core technical bottlenecks of low flame emissivity and difficulty in morphology control during pure hydrogen combustion, but also significantly improves the system's environmental friendliness, safety, and economy while ensuring excellent thermal performance by introducing an outer layer mixed gas cracking carbonization and NOx in-situ reduction mechanism, and integrating a compressed air cooling system. This provides a practical and feasible technical path for the low-carbon transformation of the glass industry.

[0059] The above description is merely a preferred embodiment of the present invention and does not limit the implementation and protection scope of the present invention. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. A hydrogen spray gun, characterized in that, include: The spray gun intermediate tube (4) includes an integrally formed bent section and a straight section. The bent section serves as the hydrogen connection end and is provided with a pipe inlet (41). The end of the straight section away from the bent section is the spray gun nozzle (14). The inner tube (5) of the spray gun is a straight tube that is movably inserted inside the middle tube (4) of the spray gun. One end of the inner tube (5) near the nozzle (14) of the spray gun is the inner tube nozzle (51), and the other end extends out of the middle tube (4) of the spray gun as the oxygen connector end through the insertion port (41). The spray gun outer tube (6) is a sleeve with one end closed, covering the outer wall of the straight section of the spray gun middle tube (4); the closed end of the spray gun outer tube (6) is provided with a through hole, and the spray gun nozzle (14) of the spray gun middle tube (4) extends out from the through hole; the end of the spray gun outer tube (6) near the bend section of the spray gun middle tube (4) is the mixing gas connection end; An air guide hole (3) is provided on the pipe wall of the spray gun intermediate tube (4) near the spray gun nozzle (14) so ​​that the annular space between the spray gun intermediate tube (4) and the spray gun outer tube (6) is connected.

2. A hydrogen spray gun according to claim 1, characterized in that, The spray gun is provided with a spray gun slot guide rail (1) in the area inside the middle tube (4) of the spray gun and near the inner tube nozzle (51), and the inner tube nozzle (51) is engaged in the spray gun slot guide rail (1).

3. A hydrogen spray gun according to claim 2, characterized in that, It also includes a flame adjustment component, which includes a spray gun inner tube scale value (8) and a spray gun inner tube adjustment button (9), which is located at the oxygen inlet end of the spray gun inner tube (5) and is used to drive the spray gun inner tube (5) to move along the spray gun slot guide rail (1).

4. A hydrogen spray gun according to claim 1, characterized in that, It also includes a spray gun cap (2), which is a hollow structure, fitted onto the spray gun nozzle (14), and covering the sealed end of the spray gun outer tube (6).

5. A hydrogen spray gun according to claim 1, characterized in that, A sealing gasket (7) is provided at the insertion port (41).

6. A hydrogen spray gun according to claim 1, characterized in that, The air intake direction of the mixing gas pipe end of the spray gun outer tube (6) is arranged vertically.

7. A hydrogen spray gun combustion system, characterized in that, The hydrogen spray gun, as described in any one of claims 1-6, further includes: The oxygen supply line (A) is connected to the oxygen connector end of the inner tube (5) of the spray gun for supplying combustion-supporting oxygen; The hydrogen supply line (B) is connected to the hydrogen connection end of the spray gun intermediate pipe (4) for introducing the main fuel hydrogen; A mixed gas supply pipeline (C) is connected to the mixed gas inlet end of the outer pipe (6) of the spray gun for introducing mixed gas, which includes natural gas and ammonia; wherein the natural gas is used for cracking and carbonization, and the ammonia is used for reducing nitrogen oxides; Multiple compressed air cooling pipes (D) are connected to the oxygen supply pipe (A), hydrogen supply pipe (B), and mixed gas supply pipe (C) respectively, and are used to supply compressed air to each layer of the spray gun for cooling during non-combustion periods.

8. A hydrogen spray gun combustion system according to claim 7, characterized in that, The oxygen supply line (A), hydrogen supply line (B), and mixed gas supply line (C) are all equipped with a first-class control valve group, and the compressed air cooling line (D) is equipped with a second-class control valve group.

9. A hydrogen spray gun combustion system according to claim 8, characterized in that, The first type of control valve assembly includes: The regulating valve, connected to the corresponding connector of the spray gun via a hose, is used to regulate the flow rate of gas in the pipeline; A check valve, connected to the regulating valve via a distribution pipe, is used to prevent gas backflow. A ball valve, connected to the check valve, is used to cut off the gas supply.

10. A hydrogen spray gun combustion system according to claim 9, characterized in that, The second type of control valve assembly includes: A compressed air flange (131) is connected to the distribution pipe via a compressed air hose (13) for connecting a compressed air source and distributing cooling air to various pipelines; A compressed air check valve (132), connected to the compressed air flange (131), is used to prevent compressed air backflow; A compressed air ball valve (133) is connected to the compressed air check valve (132) and is used to cut off the cooling air source.

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