Ceramic shuttle-type kiln

Abstract

The invention discloses a ceramic shuttle type kiln, and relates to the technical field of ultrafast imaging, the ceramic shuttle type kiln comprises a shuttle type kiln body, a gas burner, a hydrogen mixing device, a natural gas external supply pipeline, a hydrogen external supply pipeline, a combustion-supporting air pipeline and a smoke exhaust induced draft fan; a plurality of gas combustors are arranged on the side wall of the shuttle kiln body, and the technical characteristics that hydrogen is independently supplied, and the heads of the combustors are mixed are adopted, so that the safety of natural gas mixing of the shuttle kiln is guaranteed; meanwhile, a safety control strategy of firstly closing and then opening is adopted for hydrogen in working condition adjustment, the hydrogen mixing proportion can be set at will, the problem that combustion control and temperature control of the shuttle kiln are not matched is solved, safe and stable operation of hydrogen doping of natural gas of the shuttle kiln is guaranteed, and the device can be well applied to the firing production environment of ceramic products and has good application prospects. The emission of carbon dioxide is reduced, and a contribution is made to the carbon reduction work of an enterprise.

Description

Technical Field

[0001] This invention relates to the field of ultrafast imaging technology, and specifically to a ceramic shuttle kiln. Background Technology

[0002] In the combustion of hydrogen-blended natural gas, the combustion characteristics of the fuel vary greatly due to differences in its hydrogen blending ratio, calorific value, combustion rate, density, and other physical properties. To achieve efficient combustion of hydrogen-blended natural gas in ceramic kilns, system design and precise control are required, focusing on parameters such as combustion rate, stable combustion limit, air-fuel ratio, and temperature field distribution. Natural gas is a highly flammable fuel; its main component, methane, rapidly forms a short, thick flame after combustion, with the high-temperature zone concentrated in the front combustion section. Adding hydrogen, which has a faster combustion rate, to natural gas causes the localized high-temperature zone formed in the front combustion section to shift further forward. Improper control can easily lead to combustion instability issues such as flashback and flame lift-off, as well as incomplete combustion problems like yellow flame. Ceramic shuttle kilns are widely used small-scale intermittent production furnaces with advantages such as small size, flexible combustion control, and production flexibility. Achieving safe and stable combustion of hydrogen-blended natural gas in shuttle kiln combustion systems presents challenges such as safe mixing of hydrogen fuel, prevention of flashback due to combustion instability, and temperature control matching. Summary of the Invention

[0003] The purpose of this invention is to overcome the problems of safe mixing, combustion control, and temperature control matching caused by the blending of natural gas and hydrogen in ceramic shuttle kilns, and to provide a ceramic shuttle kiln that, by optimizing the fuel supply, mixing, and combustion system, ensures the safety and stability of kiln combustion while reducing carbon emissions, thus meeting the actual needs of ceramic kilns for natural gas-blended hydrogen combustion operation and carbon reduction.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] This invention provides a ceramic shuttle kiln, comprising a shuttle kiln body, gas burners, a hydrogen blending device, a natural gas external supply pipeline, a hydrogen external supply pipeline, a combustion air pipeline, and an exhaust fan. Multiple gas burners are arranged on the sidewall of the shuttle kiln body. The burners are designed with separate supply of natural gas and air, and mixed combustion at the head. Each burner is connected to the hydrogen blending device, which is connected to both the natural gas and hydrogen external supply pipelines. A fuel cut-off solenoid valve and an ignition controller are also installed on the pipeline connecting the hydrogen blending device and the burners. Each burner is also connected to the combustion air pipeline, and the shuttle kiln body is connected to a chimney via the exhaust fan.

[0006] As a further embodiment of the present invention, the shuttle kiln body is composed of a steel structure frame and an insulation layer, and a trolley for loading ceramic products is provided inside the shuttle kiln chamber of the shuttle kiln body; a movable furnace door is provided on the shuttle kiln body, and the movable furnace door is connected and fixed by a rotating shaft installed on the shuttle kiln body, so as to facilitate opening the movable furnace door to push in or push out the trolley loaded with ceramic products.

[0007] As a further embodiment of the present invention, the hydrogen blending device includes a natural gas inlet pipe connected to an external natural gas supply pipeline and a hydrogen inlet pipe connected to an external hydrogen supply pipeline. The hydrogen inlet pipe is disposed inside the natural gas inlet pipe and is connected to the outlet pipe of the hydrogen blending device. The outlet pipe of the hydrogen blending device is connected to a burner. A jet perforated plate is provided on the hydrogen inlet pipe facing the outlet pipe of the hydrogen blending device.

[0008] As a further aspect of the present invention, the hydrogen pressure in the hydrogen inlet pipe of the hydrogen blending device is higher than the natural gas pressure in the natural gas inlet pipe. The natural gas external supply pipeline is connected to the inlet of the hydrogen blending structure, and the hydrogen external supply pipeline is connected to an independent jet perforated plate inside the hydrogen blending device. The outlet of the jet perforated plate is directly opposite the outlet pipe of the hydrogen blending device. The hydrogen ejected from the jet perforated plate completes the fuel mixing by entraining and entraining the natural gas, thereby ensuring the uniformity and safety of the blended fuel.

[0009] As a further embodiment of the present invention, a natural gas pressure reducing valve, a natural gas electromagnetic flow controller, and a natural gas pipeline check valve are sequentially connected to the natural gas external supply pipeline. Natural gas in the natural gas external supply pipeline passes through the natural gas pressure reducing valve, the natural gas electromagnetic flow controller, and the natural gas pipeline check valve in sequence, and then is connected to the hydrogen blending device at the inlet of each burner through pipelines.

[0010] As a further aspect of the present invention, a hydrogen pressure reducing valve, a hydrogen electromagnetic flow controller, and a hydrogen fuel electromagnetic shut-off valve are sequentially connected to the hydrogen external supply pipeline. The externally supplied hydrogen fuel passes sequentially through the hydrogen pressure reducing valve, the hydrogen electromagnetic flow controller, the hydrogen fuel electromagnetic shut-off valve, the manual hydrogen balloon valve, and the hydrogen pipeline check valve installed on the hydrogen external supply pipeline, and is then connected to the inlet section of each burner via the hydrogen external supply pipeline. The manual hydrogen balloon valve and the hydrogen pipeline check valve are installed on the hydrogen external supply pipeline in the section inlet of the burner.

[0011] As a further embodiment of the present invention, the combustion air duct is connected to the combustion air interface at the front end of each burner inlet and is connected to the combustion air fan. The combustion air fan is connected to the shuttle kiln control system through a combustion air frequency converter. A combustion air electromagnetic regulating valve is also installed on the combustion air duct. The combustion air is supplied by the combustion air fan and is transported to the front end of the burner inlet through the combustion air duct. After passing through the combustion air electromagnetic regulating valve, it is connected to the combustion air interface at the burner head. The combustion air fan is controlled by the shuttle kiln control system through the equipped combustion air frequency converter.

[0012] As a further aspect of the present invention, a thermocouple for real-time temperature monitoring is also installed on the side wall of the shuttle kiln body. The thermocouple is used to collect signals and connect to and input them into the shuttle kiln control system. The shuttle kiln control system is connected to a natural gas electromagnetic flow controller, a hydrogen electromagnetic flow controller, a hydrogen fuel electromagnetic shut-off valve, a fuel shut-off electromagnetic valve, a combustion air electromagnetic regulating valve, a combustion air frequency converter, and an ignition controller. It is used to issue control commands to the natural gas electromagnetic flow controller, the hydrogen electromagnetic flow controller, the hydrogen fuel electromagnetic shut-off valve, the ignition controller, the combustion air electromagnetic regulating valve, and the combustion air frequency converter according to the temperature firing curve of the ceramic product.

[0013] In the above technical solution, the ceramic shuttle kiln provided by the present invention has the following beneficial effects:

[0014] 1. This invention uses a mixture of hydrogen and natural gas, replacing the traditional pure natural gas combustion method, which effectively reduces carbon dioxide emissions during combustion. Furthermore, because the mixed combustion of hydrogen and natural gas optimizes the calorific value utilization during combustion, this invention improves the overall energy efficiency of the fuel. During firing, hydrogen acts as a combustion-supporting gas, helping natural gas to burn more completely, reducing energy waste and improving thermal energy conversion efficiency. By optimizing the combustion method, this invention can reduce energy consumption and costs while increasing production efficiency, achieving a reduction in greenhouse gases during ceramic firing, meeting current environmental requirements for green manufacturing and low carbon emissions, and contributing to the ceramic industry's transformation towards sustainable development.

[0015] 2. This invention employs multiple safety designs to enhance the safety and stability of the kiln combustion process, such as a one-way valve for the hydrogen pipeline, an electromagnetic shut-off valve for hydrogen fuel, and an ignition controller. These features ensure multiple layers of protection during combustion, preventing safety hazards such as hydrogen leakage. The intelligent control system automatically adjusts the mixing ratio, flow rate, and combustion air volume of natural gas and hydrogen based on real-time kiln temperature and firing curves, ensuring precise temperature control during firing. This automated adjustment not only improves the stability of the ceramic firing process but also reduces manual intervention, lowers the risk of human error, and enhances the level of intelligence in the production process.

[0016] 3. This invention ensures flame stability and avoids problems such as flame instability and incomplete combustion through precise burner control and uniform gas distribution, thus guaranteeing the safe and stable operation of the kiln. Regarding hydrogen supply and control, this invention employs a "shut-down then turn-on" hydrogen control strategy, meaning that during shutdown and low-temperature stages, the hydrogen supply is shut off first, followed by a gradual shutdown of the natural gas supply, thereby avoiding the potential risk of hydrogen leakage. Furthermore, the hydrogen is mixed with natural gas through a perforated plate, ensuring fuel uniformity and preventing unstable combustion of the mixed gas within the kiln.

[0017] 4. The adjustable gas and hydrogen ratio control system of this invention can flexibly adjust the fuel ratio according to different ceramic firing process requirements, meeting the firing needs of different products. Whether it is high-temperature firing or products with special requirements for firing curves, precise gas mixing control can optimize firing quality, improve product consistency and yield. The adjustable gas and hydrogen ratio control system also enables more uniform and stable combustion, reducing problems such as carbon buildup and coking that may occur during firing, thereby reducing wear and scaling of the burner and kiln. The stability of the internal kiln environment increases the service life of the equipment, reduces the frequency and cost of equipment maintenance, and further optimizes the overall production cost.

[0018] In summary, by optimizing the blending and combustion control of natural gas and hydrogen, this invention not only improves energy utilization efficiency and reduces carbon dioxide emissions, but also enhances firing quality, production efficiency, and the service life of kiln equipment while ensuring production safety and stability. It has broad market application value and environmental significance. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0020] Figure 1 This is a schematic diagram of the structure of a ceramic shuttle kiln according to the present invention.

[0021] Figure 2 This is a side view of a ceramic shuttle kiln according to the present invention.

[0022] Figure 3 This is a schematic diagram of a hydrogen mixing device in a ceramic shuttle kiln according to the present invention.

[0023] Figure 4 This is a schematic diagram of a jet porous plate for a hydrogen mixing device in a ceramic shuttle kiln according to the present invention.

[0024] Figure label:

[0025] 1-Shuttle kiln control system; 2-Natural gas external supply pipeline; 3-Natural gas pressure reducing valve; 4-Natural gas electromagnetic flow controller; 5-Hydrogen external supply pipeline; 6-Hydrogen pressure reducing valve; 7-Hydrogen electromagnetic flow controller; 8-Hydrogen fuel electromagnetic shut-off valve; 9-Natural gas pipeline check valve; 10-Hydrogen pipeline check valve; 11-Manual hydrogen balloon valve; 12-Fuel shut-off solenoid valve; 13-Ignition controller; 14-Burner; 15-Steel Structural frame; 16-Insulation layer; 17-Shuttle kiln chamber; 18-Trolley; 19-Hydrogen blending device; 20-Combustion air electromagnetic regulating valve; 21-Thermocouple; 22-Combustion air fan; 23-Combustion air frequency converter; 24-Exhaust fan; 25-Chimney; 26-Rotating shaft; 27-Movable furnace door; 28-Natural gas inlet pipe; 29-Hydrogen inlet pipe; 30-Jet perforated plate; 31-Hydrogen blending device outlet pipe. Detailed Implementation

[0026] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings.

[0027] To achieve safe and stable combustion of natural gas with hydrogen in a shuttle kiln combustion system, several issues need to be addressed, including safe mixing of hydrogen fuel, prevention of backfire due to unstable combustion, and temperature control matching. The purpose of this invention is to provide a ceramic shuttle kiln that, by optimizing the fuel supply, mixing, and combustion system, ensures safe and stable combustion while reducing carbon emissions, thus meeting the practical needs of ceramic kilns for natural gas-hydrogen blended combustion and carbon reduction.

[0028] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0029] like Figure 1 and Figure 2As shown, one embodiment of the present invention provides a ceramic shuttle kiln, including a shuttle kiln body, a gas burner 14, a hydrogen blending device 19, a natural gas external supply pipeline 2, a hydrogen external supply pipeline 5, a combustion air pipeline, and an exhaust fan 24. Multiple gas burners 14 are arranged on the side wall of the shuttle kiln body. The burners 14 are designed with separate supply of natural gas and air, and mixed combustion at the head. Each burner 14 is connected to the hydrogen blending device 19, which is connected to both the natural gas external supply pipeline 2 and the hydrogen external supply pipeline 5. A fuel cut-off solenoid valve 12 and an ignition controller 13 are also installed on the supply pipeline between the hydrogen blending device 19 and the burners 14. Each burner 14 is also connected to the combustion air pipeline. The shuttle kiln body is also connected to a chimney 25 via the exhaust fan 24.

[0030] In the ceramic shuttle kiln of this embodiment, natural gas and hydrogen are connected together through their respective one-way valves and mixed in the hydrogen blending device 19. The mixed fuel is connected to the fuel cut-off solenoid valve 12 through the delivery pipeline. The mixed fuel after passing through the fuel cut-off solenoid valve 12 is finally connected to the fuel interface at the head of the burner 14. The ignition controller 13 installed on the delivery pipeline has functions such as ignition, monitoring the flame condition and cutting off the supply of mixed fuel. The combustion air is supplied to the front section of the burner 14 inlet through the combustion air pipeline and connected to the combustion air interface at the head of the burner 14 through the electromagnetic regulating valve for combustion support. The shuttle kiln body is also connected to the chimney 25 through the exhaust fan 24, which is responsible for exhausting the combustion flue gas in the shuttle kiln body.

[0031] In this embodiment, see Figure 1 and Figure 2 As shown, the shuttle kiln body is composed of a steel frame 15 and an insulation layer 16. The shuttle kiln chamber 17 of the shuttle kiln body is equipped with a trolley 18 for loading ceramic products. The shuttle kiln body is equipped with a movable furnace door 27, which is connected and fixed by a rotating shaft 26 installed on the shuttle kiln body, so as to facilitate the opening of the movable furnace door 27 to push in or push out the trolley 18 loaded with ceramic products.

[0032] In this embodiment, see Figures 1 to 4 As shown, the hydrogen blending device 19 includes a natural gas inlet pipe 28 connected to the natural gas external supply pipeline 2 and a hydrogen inlet pipe 29 connected to the hydrogen external supply pipeline 5. The hydrogen inlet pipe 29 is disposed inside the natural gas inlet pipe 28 and is connected to the hydrogen blending device outlet pipe 31. The hydrogen blending device outlet pipe 31 is connected to the burner 14. A jet perforated plate 30 is provided on the hydrogen inlet pipe 29 facing the hydrogen blending device outlet pipe 31.

[0033] In this embodiment, the hydrogen pressure in the hydrogen inlet pipe 29 of the hydrogen blending device 19 is higher than the natural gas pressure in the natural gas inlet pipe 28. The natural gas external supply pipe 2 is connected to the inlet of the hydrogen blending structure, and the hydrogen external supply pipe 5 is connected to the independent jet perforated plate 30 inside the hydrogen blending device 19. The outlet of the jet perforated plate 30 is directly opposite the outlet pipe 31 of the hydrogen blending device. The hydrogen ejected from the jet perforated plate 30 completes the fuel mixing by entraining and entraining the natural gas, thereby ensuring the uniformity and safety of the blended fuel.

[0034] This invention uses a mixture of hydrogen and natural gas, replacing the traditional pure natural gas combustion method, which effectively reduces carbon dioxide emissions during combustion. Furthermore, because the mixed combustion of hydrogen and natural gas optimizes the calorific value utilization during combustion, this invention improves the overall energy efficiency of the fuel. During firing, hydrogen acts as a combustion-supporting gas, helping natural gas to burn more completely, reducing energy waste and improving thermal energy conversion efficiency. By optimizing the combustion method, this invention can reduce energy consumption and costs while increasing production efficiency, achieving a reduction in greenhouse gases during ceramic firing, meeting current environmental requirements for green manufacturing and low-carbon emissions, and contributing to the ceramic industry's transformation towards sustainable development.

[0035] In this embodiment, a natural gas pressure reducing valve 3, a natural gas electromagnetic flow controller 4, and a natural gas pipeline check valve 9 are sequentially connected to the natural gas external supply pipeline 2. Natural gas in the natural gas external supply pipeline 2 passes through the natural gas pressure reducing valve 3, the natural gas electromagnetic flow controller 4, and the natural gas pipeline check valve 9 in sequence, and then is connected to the hydrogen blending device 19 at the inlet of each burner 14 through pipelines.

[0036] In this embodiment, a hydrogen pressure reducing valve 6, a hydrogen electromagnetic flow controller 7, and a hydrogen fuel electromagnetic shut-off valve 8 are sequentially connected to the hydrogen external supply pipeline 5. The externally supplied hydrogen fuel passes sequentially through the hydrogen pressure reducing valve 6, the hydrogen electromagnetic flow controller 7, the hydrogen fuel electromagnetic shut-off valve 8, the manual hydrogen balloon valve 11, and the hydrogen pipeline check valve 10 provided on the hydrogen external supply pipeline 5, and is then connected to the inlet section of each burner 14 via the hydrogen external supply pipeline 5. The hydrogen external supply pipeline 5 at the inlet section of the burner 14 is equipped with a manual hydrogen balloon valve 11 and a hydrogen pipeline check valve 10.

[0037] The adjustable gas-hydrogen ratio control system of this invention can flexibly adjust the fuel ratio according to different ceramic firing process requirements, meeting the firing needs of different products. Whether it is high-temperature firing or products with special requirements for firing curves, precise gas mixing control can optimize firing quality, improve product consistency and yield. The adjustable gas-hydrogen ratio control system also enables more uniform and stable combustion, reducing problems such as carbon buildup and coking that may occur during firing, thereby reducing wear and scaling of the burner 14 and the kiln. The stability of the internal environment of the kiln increases the service life of the equipment, reduces the frequency and cost of equipment maintenance, and further optimizes the overall production cost.

[0038] In this embodiment, the combustion air duct is connected to the combustion air interface at the inlet of each burner 14 and is connected to the combustion air fan 22. The combustion air fan 22 is connected to the shuttle kiln control system 1 through the combustion air frequency converter 23. The combustion air duct is also equipped with a combustion air electromagnetic regulating valve 20. The combustion air is supplied by the combustion air fan 22 and is transported to the inlet of the burner 14 through the combustion air duct. After passing through the combustion air electromagnetic regulating valve 20, it is connected to the combustion air interface at the head of the burner 14. The combustion air fan 22 is controlled by the shuttle kiln control system 1 through the equipped combustion air frequency converter 23.

[0039] In this embodiment, a thermocouple 21 for real-time temperature monitoring is also installed on the side wall of the shuttle kiln body. The thermocouple 21 is used to collect signals and connect to and input them into the shuttle kiln control system 1. The shuttle kiln control system 1 is connected to the natural gas electromagnetic flow controller 4, the hydrogen electromagnetic flow controller 7, the hydrogen fuel electromagnetic shut-off valve 8, the fuel shut-off solenoid valve 12, the combustion air electromagnetic regulating valve 20, the combustion air frequency converter 23, and the ignition controller 13. It is used to issue control commands to the natural gas electromagnetic flow controller 4, the hydrogen electromagnetic flow controller 7, the hydrogen fuel electromagnetic shut-off valve 8, the ignition controller 13, the combustion air electromagnetic regulating valve 20, and the combustion air frequency converter 23 according to the temperature firing curve of the ceramic product.

[0040] This invention employs multiple safety designs to enhance the safety and stability of the kiln combustion process, such as a one-way valve 10 for the hydrogen pipeline, an electromagnetic shut-off valve 8 for hydrogen fuel, and an ignition controller 13. These features ensure multiple layers of protection during combustion, preventing safety hazards such as hydrogen leakage. The intelligent control system automatically adjusts the mixing ratio, flow rate, and combustion air volume of natural gas and hydrogen based on real-time kiln temperature and firing curves, ensuring precise temperature control during firing. This automated adjustment not only improves the stability of the ceramic firing process but also reduces manual intervention, lowers the risk of human error, and enhances the level of intelligence in the production process.

[0041] The working principle of the ceramic shuttle kiln provided by this invention is as follows:

[0042] When the shuttle kiln starts up, the combustion air fan 22 and the exhaust fan 24 are turned on first to maintain the normal operation of the flue gas system inside the furnace. The shuttle kiln control system 1 sends commands to the combustion air electromagnetic regulating valve 20 and the combustion air frequency converter 23 to adjust the set parameters of the combustion air. Then, the shuttle kiln control system 1 sends a command to the natural gas electromagnetic flow controller 4 to open the natural gas external supply pipeline 2 to supply gas to the burner 14. After that, the shuttle kiln control system 1 sends an ignition command to the ignition controller 13, which opens the fuel cut-off solenoid valve 12 and connects the ignition electrode current of the burner 14 for ignition. The natural gas and combustion air supplied to the burner 14 mix at the head of the burner 14, and the natural gas is ignited under the action of the ignition electrode, and a natural gas combustion flame appears in the burner 14, completing the ignition. Once the ignition controller 13 detects a flameout, it will immediately close the fuel cut-off solenoid valve 12 to ensure the safety of the burner 14 and the furnace chamber 17 of the shuttle kiln.

[0043] After the shuttle kiln is ignited normally, a natural gas combustion flame appears in the burner 14. At this time, the shuttle kiln control system 1 sends a command to the hydrogen electromagnetic flow controller 7 and the hydrogen fuel electromagnetic shut-off valve 8 to open the hydrogen external supply pipeline 5 to supply gas. After passing through the hydrogen pressure reducing valve 6, the hydrogen electromagnetic flow controller 7, the hydrogen fuel electromagnetic shut-off valve 8, the hydrogen pipeline check valve 10, and the manual hydrogen balloon valve 11, the hydrogen is mixed with the natural gas in the hydrogen blending device 19 and sent into the burner 14 to form a natural gas-hydrogen blended flame.

[0044] When the shuttle kiln is running normally, the shuttle kiln control system 1 compares the temperature signal returned by the temperature measuring thermocouple 21 with the temperature firing curve setting parameters of the ceramic product. When the temperature is greater than the firing curve setting parameters, it first sends a command to the hydrogen electromagnetic flow controller 7 to reduce the hydrogen flow rate to the minimum set value according to the set hydrogen blending ratio. After a delay of 0.5 to 1 second, it sends control commands to the natural gas electromagnetic flow controller 4 and the combustion air frequency converter 23 to reduce the natural gas flow rate and the combustion air flow rate to the minimum set value.

[0045] When the shuttle kiln is operating normally, if the temperature is lower than the set parameters of the firing curve, a control command is first sent to the natural gas electromagnetic flow controller 4 and the combustion air frequency converter 23 to increase the natural gas flow and combustion air flow to the maximum set value. After a delay of 0.5 to 1 second, a control command is sent to the hydrogen electromagnetic flow controller 7 to increase the hydrogen flow to the maximum set value according to the set hydrogen blending ratio, until the temperature monitored by the thermocouple 21 is equal to the set parameters of the firing curve. Then, the existing combustion parameters are kept unchanged until the next adjustment condition.

[0046] When the shuttle kiln is shut down normally, the shuttle kiln control system 1 first sends a control command to the hydrogen electromagnetic flow controller 7 to gradually reduce the hydrogen flow rate to the minimum set value. Then, the shuttle kiln control system 1 sends a command to the hydrogen fuel electromagnetic shut-off valve 8 to close the valve, reducing the hydrogen flow rate in the pipeline to zero. After a delay of 0.5 to 1 second, it sends a command to the natural gas electromagnetic flow controller 4 to reduce the natural gas flow rate to zero. After the flame of the burner 14 is extinguished, the ignition controller 13 automatically closes the fuel shut-off electromagnetic valve 12 before the burner 14, thereby ensuring the safety of the system. At the same time, this achieves the purpose of reducing carbon dioxide emissions from the system by blending hydrogen into the natural gas in the shuttle kiln.

[0047] In this embodiment, during hydrogen blending, natural gas first enters the inlet pipe 28 of the blending device 19, and high-pressure hydrogen enters the hydrogen inlet pipe 29 of the blending device. It is then sprayed out through the internal jet perforated plate 30 and entrains the natural gas in the blending device. After safe mixing, it is discharged from the outlet pipe 31 of the blending device and sent to the combustion system.

[0048] For example, this technology is applied in a gas-fired ceramic shuttle kiln, employing a separate hydrogen supply and mixing at the burner head; simultaneously, a safety control strategy of shutting off the hydrogen supply before turning it on is adopted during operation. The instantaneous flow rate of natural gas during normal firing in the ceramic shuttle kiln is 40 Nm³. 3 / h, the hydrogen blending ratio is set to 32%, and the shuttle kiln control system 1 gradually adjusts the hydrogen electromagnetic flow controller 7 to the set value of 19 Nm. 3 / h, the actual hydrogen blending ratio is 32.2%. At this time, the temperature measured by thermocouple 21 is 1260℃, and the firing temperature of the ceramic product is 1280℃. When the temperature measured by thermocouple 21 is 1285℃, which exceeds the set temperature, the shuttle kiln control system 1 first adjusts the parameters of the hydrogen electromagnetic flow controller 7 to the set value of 4.71 Nm. 3 / h; After a delay of 0.5 to 1 second, the shuttle kiln control system 1 adjusts the parameters of the natural gas electromagnetic flow controller 4 to the set value of 10 Nm. 3 / h, maintaining a hydrogen blending ratio of 32%, achieving a safe strategy of turning off hydrogen first and then turning it on, while reducing carbon dioxide emissions of the shuttle kiln by 11.42%.

[0049] In this invention, precise control of the burner 14 and uniform distribution of the mixed gas ensure flame stability, avoiding problems such as flame instability and incomplete combustion, thus ensuring the safe and stable operation of the kiln. Regarding hydrogen supply and control, this invention employs a "shut-down then turn-on" hydrogen control strategy, that is, during furnace shutdown and low-temperature stages, the hydrogen supply is shut off first, followed by a gradual shutdown of the natural gas supply, thereby avoiding the potential risk of hydrogen leakage. Furthermore, the hydrogen is mixed with natural gas through a perforated plate, ensuring fuel uniformity and preventing unstable combustion of the mixed gas in the kiln.

[0050] In summary, by optimizing the blending and combustion control of natural gas and hydrogen, this invention not only improves energy utilization efficiency and reduces carbon dioxide emissions, but also enhances firing quality, production efficiency, and the service life of kiln equipment while ensuring production safety and stability. It has broad market application value and environmental significance.

[0051] The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular forms “a,” “the,” and “the” used in this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associatedly listed items.

[0052] It should be understood that although the terms first, second, third, etc., may be used in this invention to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, first information may also be referred to as second information without departing from the scope of this invention, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to a determination."

[0053] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A ceramic shuttle kiln, characterized in that, The system includes a shuttle kiln body, a gas burner (14), a hydrogen blending device (19), a natural gas external supply pipeline (2), a hydrogen external supply pipeline (5), a combustion air pipeline, and an exhaust fan (24). The shuttle kiln body has multiple gas burners (14) arranged on its side wall. The burners (14) are designed to be supplied with natural gas and air separately and mixed at the head for combustion. Each burner (14) is connected to the hydrogen blending device (19). The hydrogen blending device (19) is connected to the natural gas external supply pipeline (2) and the hydrogen external supply pipeline (5). A fuel cut-off solenoid valve (12) and an ignition controller (13) are also installed on the pipeline between the hydrogen blending device (19) and the burner (14). Each burner (14) is also connected to the combustion air pipeline. The shuttle kiln body is also connected to the chimney (25) through the exhaust fan (24).

2. A ceramic shuttle kiln according to claim 1, characterized in that, The shuttle kiln body is composed of a steel frame (15) and an insulation layer (16). The shuttle kiln furnace chamber (17) of the shuttle kiln body is equipped with a trolley (18) for loading ceramic products. The shuttle kiln body is equipped with a movable furnace door (27), which is connected and fixed by a rotating shaft (26) installed on the shuttle kiln body.

3. A ceramic shuttle kiln according to claim 1, characterized in that, The hydrogen blending device (19) includes a natural gas inlet pipe (28) connected to the natural gas external supply pipeline (2) and a hydrogen inlet pipe (29) connected to the hydrogen external supply pipeline (5). The hydrogen inlet pipe (29) is located inside the natural gas inlet pipe (28) and is connected to the hydrogen blending device outlet pipe (31). The hydrogen blending device outlet pipe (31) is connected to the burner (14). A jet perforated plate (30) is provided on the hydrogen inlet pipe (29) facing the hydrogen blending device outlet pipe (31).

4. A ceramic shuttle kiln according to claim 3, characterized in that, The hydrogen pressure in the hydrogen inlet pipe (29) of the hydrogen blending device (19) is higher than the natural gas pressure in the natural gas inlet pipe (28). The natural gas external supply pipe (2) is connected to the inlet of the hydrogen blending structure, and the hydrogen external supply pipe (5) is connected to the independent jet perforated plate (30) inside the hydrogen blending device (19). The outlet of the jet perforated plate (30) is directly opposite the outlet pipe (31) of the hydrogen blending device. The hydrogen ejected from the jet perforated plate (30) completes the fuel mixing by inducing the natural gas.

5. A ceramic shuttle kiln according to claim 4, characterized in that, The natural gas external supply pipeline (2) is connected in sequence to a natural gas pressure reducing valve (3), a natural gas electromagnetic flow controller (4), and a natural gas pipeline check valve (9). The natural gas in the natural gas external supply pipeline (2) passes through the natural gas pressure reducing valve (3), the natural gas electromagnetic flow controller (4), and the natural gas pipeline check valve (9) in sequence, and then is connected to the hydrogen blending device (19) at the inlet of each burner (14) through the pipeline.

6. A ceramic shuttle kiln according to claim 5, characterized in that, The hydrogen external supply pipeline (5) is connected in sequence to a hydrogen pressure reducing valve (6), a hydrogen electromagnetic flow controller (7), and a hydrogen fuel electromagnetic shut-off valve (8); the externally supplied hydrogen fuel is connected to the inlet section of each burner (14) through the hydrogen external supply pipeline (5), and the hydrogen external supply pipeline (5) in the inlet section of the burner (14) is equipped with a manual hydrogen balloon valve (11) and a hydrogen pipeline check valve (10).

7. A ceramic shuttle kiln according to claim 6, characterized in that, The combustion air duct is connected to the combustion air interface at the inlet of each burner (14) and is connected to the combustion air fan (22). The combustion air fan (22) is connected to the shuttle kiln control system (1) through the combustion air frequency converter (23). The combustion air duct is also equipped with a combustion air electromagnetic regulating valve (20).

8. A ceramic shuttle kiln according to claim 7, characterized in that, The shuttle kiln body is also equipped with a thermocouple (21) for real-time temperature monitoring on the side wall of the shuttle kiln. The thermocouple (21) is used to collect signals and connect and input them into the shuttle kiln control system (1). The shuttle kiln control system (1) is connected to the natural gas electromagnetic flow controller (4), the hydrogen electromagnetic flow controller (7), the hydrogen fuel electromagnetic shut-off valve (8), the fuel shut-off electromagnetic valve (12), the combustion air electromagnetic regulating valve (20), the combustion air frequency converter (23), and the ignition controller (13).

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