A fuel control system and method for a float glass melting furnace utilizing hydrogen combustion

Abstract

The present invention relates to the technical field of hydrogen fuel application in the thermal industry, and specifically to a fuel control system and method for a float glass furnace utilizing hydrogen combustion. The present invention subdivides the fuel system into three-stage fuel supply modules, controls the natural gas fuel source through the first-stage module, controls the fuel hydrogen blending ratio through the second-stage module, and then regulates the flow and pressure of the fuel entering the glass furnace for combustion through the third-stage module. This allows for precise and effective control of the flame atmosphere in the glass furnace utilizing hydrogen combustion to reduce CO2 emissions. The present invention has wide applicability and provides a specific technical solution for the efficient utilization of hydrogen in float glass furnaces. This solution can be used in float glass furnaces fueled by natural gas, whether using a bottom-firing or side-firing method.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen fuel application in thermal industry, and in particular to a fuel control system and method for a float glass melting furnace utilizing hydrogen combustion. Background Art

[0002] More forceful policies and measures have been implemented, and a corresponding technical roadmap for carbon emissions and control has been developed. The goal is to achieve net-zero carbon dioxide emissions by balancing the total amount of carbon dioxide emitted with the amount removed from the environment (atmosphere). In addition to actively developing clean energy sources such as solar, wind, and hydrogen, my country's manufacturing industry also faces significant challenges and development opportunities.

[0003] The glass industry is a major energy consumer and carbon emitter, primarily using natural gas, heavy oil, producer gas, and petroleum coke. The combustion of these fossil fuels releases significant amounts of heat and CO2. To reduce CO2 emissions in the glass industry, fuels with low or no carbon content are needed.

[0004] Many countries around the world have gradually begun researching the blending of hydrogen into natural gas. The Netherlands began blending wind-generated hydrogen into its natural gas pipeline network in 2008, and by 2010, the average annual hydrogen blending rate reached 12% by volume. Mitsubishi Hitachi Power Systems, Ltd. in Japan, is testing hydrogen-blended natural gas through a large combustion turbine. Compared to burning natural gas alone, this method significantly reduces CO2 emissions. The United Kingdom and Germany will increase the hydrogen blending rate in their natural gas pipeline networks to 20% by 2020.

[0005] Currently, proposals are underway both domestically and internationally to utilize hydrogen combustion (fuel blended with hydrogen) in glass melting furnaces to reduce reliance on fossil fuels in the glassmaking process. As an ideal and efficient secondary energy source, hydrogen is being used to replace natural gas in glass production, enabling glass melting furnaces to operate with extremely low carbon emissions.

[0006] Melting heat transfer in float glass furnaces relies primarily on radiation. The flame's radiation heat transfer capacity depends on flame brightness, which in turn depends on the amount of carbon particles present during fuel combustion. The carbon-to-hydrogen mass ratio of hydrogen-blended natural gas decreases as the hydrogen content increases. As the hydrogen content increases, the amount of combustion air decreases, accelerating the diffusion of hydrogen and oxygen, resulting in a faster combustion rate than pure natural gas.

[0007] During the melting process of float glass, the batch material adopts reducing sulfur clarification technology, using Glauber's salt + carbon powder as clarifiers. The epoxy protection of carbon powder can prevent the Glauber's salt from decomposing prematurely. At the same time, it is necessary to strictly control the atmosphere distribution in the furnace along the length of the float glass melting furnace to ensure the decomposition of Glauber's salt at high temperature, the location of the foam zone, the viscosity control of the glass liquid surface and the discharge of tiny bubbles.

[0008] When hydrogen-doped natural gas in the prior art is burned in a float glass melting furnace, it can only form a strong oxidizing atmosphere, and it is difficult for CO to remain, forming a high-temperature oxygen-deficient environment. As a result, the atmosphere of the flame after combustion is difficult to control, and it is impossible to meet the production process requirements according to the actual production requirements of float glass.

[0009] In existing float glass melting furnaces, the burner arrangement can be divided into the following types: (1) bottom-fired type - the burner is arranged directly below the small furnace outlet, so that the combustion air covers the top of the fuel and burns vertically; (2) side-fired type - the burner is arranged on both sides of the side wall of the small furnace outlet, so that the combustion air and fuel burn horizontally. Regardless of the combustion method, the use of hydrogen combustion in float glass melting furnaces to reduce CO2 emissions will encounter the key technical problem of difficulty in controlling the flame atmosphere when hydrogen combustion is used to melt glass. Summary of the Invention

[0010] The technical problem to be solved by the present invention is: in response to the shortcomings of the existing technology, a fuel control system and method are provided that can utilize hydrogen energy for combustion in a float glass melting furnace. The fuel control system and method can conveniently and accurately regulate the proportion of hydrogen added to natural gas, effectively control the temperature system, atmosphere system and other key process parameters required for float glass melting, realize the effective utilization of hydrogen energy in the float glass melting furnace, and improve production efficiency.

[0011] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0012] A fuel control system for a float glass melting furnace utilizing hydrogen combustion comprises a main pipeline 1, wherein the input end of the main pipeline 1 is connected to a natural gas source, and the output end of the main pipeline 1 is respectively connected to the input ends of a plurality of secondary branch pipelines, wherein the number of the secondary branch pipelines is adapted to the number of processes for melting float glass;

[0013] The output end of each secondary branch pipeline is connected to a gas mixing device, which is also connected to a hydrogen pipeline. The inlet of the hydrogen pipeline is connected to a hydrogen gas source, and the outlet of the gas mixing device is connected to a mixed fuel pipeline. The hydrogen blending ratio of the natural gas in the gas mixing device is adapted to the flame atmosphere requirements of the process area.

[0014] The output end of each mixed fuel pipeline is connected to the input end of multiple three-level output pipelines, and the output end of each three-level output pipeline is connected to a corresponding small melting furnace. The excess air coefficient in the small melting furnace is adapted to the combustion temperature requirement of the process area, and the number of the small melting furnaces is adapted to the production scale of float glass melting.

[0015] Furthermore, a main regulating valve 2 is provided in the middle of the main pipeline 1 .

[0016] Furthermore, the secondary branch pipe specifically includes a high-temperature decomposition zone branch pipe 3, a foam zone branch pipe 17 and a clarification homogenization zone branch pipe 31; the high-temperature decomposition zone branch pipe 3 is connected to the high-temperature decomposition zone aeration device 11, the foam zone branch pipe 17 is connected to the foam zone aeration device 25, and the clarification homogenization zone branch pipe 31 is connected to the clarification homogenization zone aeration device 39.

[0017] Furthermore, a branch regulating valve 4, a branch flowmeter 5 and a branch pressure gauge 6 are provided in the middle of the high-temperature decomposition zone branch pipe 3; a branch regulating valve 18, a branch flowmeter 19 and a branch pressure gauge 20 are provided in the middle of the foam zone branch pipe 17; and a branch regulating valve 32, a branch flowmeter 33 and a branch pressure gauge 34 are provided in the middle of the clarification and homogenization zone branch pipe 31.

[0018] Furthermore, the high-temperature decomposition zone mixing device 11 is connected to a hydrogen pipeline 7, and a hydrogen regulating valve 8, a hydrogen flowmeter 9 and a hydrogen pressure gauge 10 are provided in the middle of the hydrogen pipeline 7; the foam zone mixing device 25 is connected to a hydrogen pipeline 21, and a hydrogen regulating valve 22, a hydrogen flowmeter 23 and a hydrogen pressure gauge 24 are provided in the middle of the hydrogen pipeline 21; the clarification and homogenization zone mixing device 39 is connected to a hydrogen pipeline 35, and a hydrogen regulating valve 36, a hydrogen flowmeter 37 and a hydrogen pressure gauge 38 are provided in the middle of the hydrogen pipeline 35.

[0019] Furthermore, the outlet of the high-temperature decomposition zone mixing device 11 is connected to the high-temperature decomposition zone mixed fuel pipeline 12, and a mixed fuel regulating valve 13 is provided in the middle of the high-temperature decomposition zone mixed fuel pipeline 12; the outlet of the foam zone mixing device 25 is connected to the foam zone mixed fuel pipeline 26, and a mixed fuel regulating valve 27 is provided in the middle of the foam zone mixed fuel pipeline 26; the outlet of the clarification and homogenization zone mixing device 39 is connected to the clarification and homogenization zone mixed fuel pipeline 40, and a mixed fuel regulating valve 3 41 is provided in the middle of the clarification and homogenization zone mixed fuel pipeline 40.

[0020] Furthermore, the output end of the pyrolysis zone mixed fuel pipeline 12 is connected to a plurality of pyrolysis zone output pipelines 14, an output regulating valve 15 and an output pressure gauge 16 are provided in the middle of the pyrolysis zone output pipeline 14, and the output end of the pyrolysis zone output pipeline 14 is connected to the pyrolysis zone small furnace;

[0021] The output end of the foam zone mixed fuel pipeline 26 is connected to a plurality of foam zone output pipelines 28. The middle of the foam zone output pipeline 28 is provided with an output regulating valve 29 and an output pressure gauge 30. The output end of the foam zone output pipeline 28 is connected to the foam zone small furnace.

[0022] The output end of the clarification and homogenization zone mixed fuel pipeline 40 is connected to multiple clarification and homogenization zone output pipelines 42. An output regulating valve 3 43 and an output pressure gauge 3 44 are provided in the middle of the clarification and homogenization zone output pipeline 42. The output end of the clarification and homogenization zone output pipeline 42 is connected to the clarification and homogenization zone small furnace.

[0023] Based on the same inventive concept, the present application also provides a fuel control method for a float glass melting furnace utilizing hydrogen combustion, based on the above-mentioned fuel control system, specifically comprising the following steps:

[0024] S1, according to the number of float glass melting processes, the production area is divided into the high-temperature decomposition area of ​​​​glauber's salt, the foaming area and the clarification and homogenization area;

[0025] S2, the natural gas main pipeline is introduced into the high-temperature decomposition zone gas mixing device, the foam zone gas mixing device and the clarification and homogenization zone gas mixing device through three secondary branch pipelines respectively;

[0026] S3, according to the flame atmosphere requirement of the pyrolysis zone (specifically, reducing flame), by controlling the branch regulating valve 1 and the hydrogen regulating valve 1, adjusting the hydrogen content of the fuel in the gas mixing device of the pyrolysis zone (specifically, ≤10%);

[0027] S4, according to the flame atmosphere requirement of the foam zone (specifically, a neutral flame is adopted), by controlling the branch regulating valve 2 and the hydrogen regulating valve 2, adjusting the hydrogen content of the fuel in the foam zone mixing device (specifically, 10% to 30%);

[0028] S5, according to the flame atmosphere requirement of the clarification and homogenization zone (specifically, a strong oxidizing flame), by controlling the branch regulating valve 3 and the hydrogen regulating valve 3, adjusting the hydrogen content of the fuel in the mixing device of the clarification and homogenization zone (specifically, 30% to 60%);

[0029] S6, according to the combustion temperature requirement of the high-temperature decomposition zone, by controlling the output regulating valve 1, adjusting the excess air coefficient in the small furnace of the high-temperature decomposition zone (specifically ≤1.02);

[0030] S7, according to the combustion temperature requirement of the foam zone, by controlling the output regulating valve 2, adjusting the excess air coefficient in the small furnace of the foam zone (specifically 1.02 to 1.10);

[0031] S8, according to the combustion temperature requirement of the clarification and homogenization zone, adjust the excess air coefficient in the small furnace of the clarification and homogenization zone (specifically, about 1.15) by controlling the output regulating valve three.

[0032] Compared with the prior art, the present invention has the following main advantages:

[0033] 1. The present invention divides the fuel system into three-stage fuel supply modules. The first-stage module controls the natural gas fuel source, the second-stage module controls the fuel hydrogen blending ratio, and the third-stage module regulates the flow and pressure of the fuel entering the glass melting furnace for combustion. This allows for precise and effective control of the flame atmosphere in the glass melting furnace during hydrogen combustion to reduce CO2 emissions.

[0034] 2. The present invention has wide applicability and provides a specific technical solution for the efficient utilization of hydrogen energy in float glass melting furnaces. This solution can be used in float glass melting furnaces fueled by natural gas, regardless of whether bottom firing or side firing is used.

[0035] 3. The present invention is simple and effective in controlling the float glass melting process. The hydrogen energy addition ratio can be flexibly changed according to the requirements of the specific glass type for the melting atmosphere, thereby realizing the effective utilization of hydrogen energy in the float glass melting furnace and improving production efficiency.

[0036] 4. The present invention utilizes hydrogen energy to reduce the amount of natural gas used, wherein the volume ratio of hydrogen added can range from 0 to 80%, and at the same time can reduce CO2 emissions generated by fuel combustion by about 0 to 30%. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 Schematic diagram of a fuel control system in an embodiment of the present invention;

[0038] Figure 2 This is a flow chart of the fuel control method in an embodiment of the present invention.

[0039] In the figure: 1. Main pipeline; 2. Main regulating valve; 3. Branch pipeline of high-temperature decomposition zone; 4. Branch regulating valve 1; 5. Branch flowmeter 1; 6. Branch pressure gauge 1; 7. Hydrogen pipeline 1; 8. Hydrogen regulating valve 1; 9. Hydrogen flowmeter 1; 10. Hydrogen pressure gauge 1; 11. Gas mixing device of high-temperature decomposition zone; 12. Mixed fuel pipeline of high-temperature decomposition zone; 13. Mixed fuel regulating valve 1; 14. Output pipeline of high-temperature decomposition zone; 15. Output regulating valve 1; 16. Output pressure gauge 1; 17. Branch pipeline of foam zone; 18. Branch regulating valve 2; 19. Branch flowmeter 2; 20. Branch pressure gauge 2; 21. Hydrogen pipeline 2; 22. Hydrogen regulating valve 2; 23. Hydrogen flowmeter 2 ; 24. Hydrogen pressure gauge 2; 25. Foam zone mixing device; 26. Foam zone mixed fuel pipeline; 27. Mixed fuel regulating valve 2; 28. Foam zone output pipeline; 29. ​​Output regulating valve 2; 30. Output pressure gauge 2; 31. Clarification and homogenization zone branch pipeline; 32. Branch regulating valve 3; 33. Branch flowmeter 3; 34. Branch pressure gauge 3; 35. Hydrogen pipeline 3; 36. Hydrogen regulating valve 3; 37. Hydrogen flowmeter 3; 38. Hydrogen pressure gauge 3; 39. Clarification and homogenization zone mixing device; 40. Clarification and homogenization zone mixed fuel pipeline; 41. Mixed fuel regulating valve 3; 42. Clarification and homogenization zone output pipeline; 43. Output regulating valve 3; 44. Output pressure gauge 3. DETAILED DESCRIPTION

[0040] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0041] It should be pointed out that, according to the needs of implementation, the various steps / components described in this application can be split into more steps / components, or two or more steps / components or partial operations of steps / components can be combined into new steps / components to achieve the purpose of the present invention.

[0042] 1. A fuel control system for a float glass melting furnace using hydrogen combustion

[0043] like Figure 1 As shown, the present invention provides a fuel control system for a float glass melting furnace that utilizes hydrogen combustion. Based on the characteristics of the float glass melting furnace's fuel supply system, the pipeline from the natural gas supply system to the melting furnace is divided into three blocks; each block is equipped with its own hydrogen fuel blending device, which adds hydrogen fuel to natural gas in a required proportion to form a mixed gas; the mixed gas blended with hydrogen fuel is then delivered to each small furnace for combustion.

[0044] The specific plan is:

[0045] (1) The combustion system is subdivided into three-level fuel supply blocks. The first-level fuel block uses natural gas as fuel. Its natural gas source comes from the natural gas station within the enterprise. According to the production scale of the float glass melting furnace, 2 to 4 second-level branch blocks are designed.

[0046] (2) The secondary branch assembly mainly includes a natural gas transmission pipeline, a regulating valve, a flow meter, a pressure gauge, a hydrogen gas source transmission pipeline, a regulating valve, a flow meter, a pressure gauge, and a natural gas and hydrogen proportional blending device. The mixed gas after the natural gas and hydrogen proportional blending can enter the tertiary branch assembly.

[0047] (3) The three-level branch module mainly includes the transportation pipeline, regulating valve, and transportation pipeline to each small furnace for the mixed gas mixed with natural gas and hydrogen in a certain proportion. The regulating valve and pressure gauge are provided. In each small furnace area, 2 to 3 burners can be set according to the scale of production.

[0048] (4) During float glass production, the ratio of natural gas to hydrogen can be controlled based on actual production needs. This means that the hydrogen content in the fuel can be controlled based on the flame atmosphere requirements of the glass batch in the float glass furnace, creating mixed fuels with varying hydrogen content. The volume ratio of hydrogen in hydrogen-blended natural gas can be controlled between 0 and 80%, reducing CO2 emissions from fuel combustion by approximately 0 to 30%.

[0049] In this example, during the melting process of -700t / d float glass, the atmosphere in the front section of the melting furnace, 1#, 2#, and 3# small furnaces needs to be strictly controlled to be a reducing flame to ensure that the saltpeter is decomposed at high temperature; 4# and 5# small furnaces are foaming areas and require a neutral flame, not an oxidizing flame, otherwise the foaming area will move to the clarifying area, causing material leakage, and a large number of bubbles and stones will appear on the glass plate; 6# and 7# small furnaces are clarifying and homogenizing areas and require a strong oxidizing flame to reduce the viscosity of the glass liquid surface and promote the discharge of tiny bubbles.

[0050] 2. A fuel control method for a float glass melting furnace using hydrogen combustion

[0051] Based on the same inventive concept, the embodiment of the present application also provides a fuel control method for a float glass melting furnace using hydrogen combustion, based on the fuel control system as described above, such as Figure 2 As shown, the following steps are included:

[0052] S1, according to the number of float glass melting processes, the production area is divided into the high-temperature decomposition area of ​​​​glauber's salt, the foaming area and the clarification and homogenization area;

[0053] S2, the natural gas main pipeline is introduced into the high-temperature decomposition zone gas mixing device, the foam zone gas mixing device and the clarification and homogenization zone gas mixing device through three secondary branch pipelines respectively;

[0054] S3, according to the flame atmosphere requirements of the pyrolysis zone, by controlling the branch regulating valve 1 and the hydrogen regulating valve 1, adjusting the hydrogen content of the fuel in the gas mixing device of the pyrolysis zone;

[0055] S4, according to the flame atmosphere requirements of the foam zone, by controlling the branch regulating valve 2 and the hydrogen regulating valve 2, adjusting the hydrogen content of the fuel in the foam zone mixing device;

[0056] S5, according to the flame atmosphere requirements of the clarification and homogenization zone, by controlling the branch regulating valve 3 and the hydrogen regulating valve 3, adjusting the hydrogen content of the fuel in the gas mixing device of the clarification and homogenization zone;

[0057] S6, according to the combustion temperature requirement of the high temperature decomposition zone, adjust the excess air coefficient in the small furnace of the high temperature decomposition zone by controlling the output regulating valve 1;

[0058] S7, according to the combustion temperature requirement of the foam zone, adjust the excess air coefficient in the small furnace of the foam zone by controlling the output regulating valve 2;

[0059] S8, according to the combustion temperature requirement of the clarification and homogenization zone, adjust the excess air coefficient in the small furnace of the clarification and homogenization zone by controlling the output regulating valve three.

[0060] In specific implementation, natural gas from the gas station passes through the main pipeline 1 and the regulating valve 2, and is divided into three branches and enters the secondary branch module:

[0061] Branch 1 enters the gas mixing device 11 through pipeline 3, regulating valve 4, flowmeter 5, and pressure gauge 6 in sequence. At the same time, hydrogen enters the gas mixing device 11 through pipeline 7, regulating valve 8, flowmeter 9, and pressure gauge 10 to mix with natural gas. Since the atmosphere of the 1#, 2#, and 3# small furnaces in the front section of the melting furnace needs to be controlled to a reducing flame, the volume ratio of hydrogen in this branch's hydrogen-blended natural gas fuel is controlled within 10%. The mixed fuel mixed by the gas mixing device 11 enters the three-level branch block through pipeline 12 and regulating valve 13, and is then transported to the 1#, 2#, and 3# small furnaces through pipeline 14, regulating valve 15, and pressure gauge 16. The excess air coefficient configured for the 1#, 2#, and 3# small furnaces needs to be controlled below 1.02.

[0062] Branch 2 enters the gas mixing device 25 through pipeline 17, regulating valve 18, flowmeter 19, and pressure gauge 20. Meanwhile, hydrogen enters the gas mixing device 25 through pipeline 21, regulating valve 22, flowmeter 23, and pressure gauge 24 to mix with natural gas. Since furnaces 4# and 5# are in the foam zone with neutral flames, this area is also the hotspot of the furnace. The volume ratio of hydrogen in the hydrogen-blended natural gas fuel in this branch can be controlled between 10% and 30%. The mixed fuel from gas mixing device 25 enters the three-stage branch assembly through pipeline 26 and regulating valve 27, and is then delivered to the pilot furnaces 4# and 5# via pipeline 28, regulating valve 29, and pressure gauge 30. The excess air coefficient configured for pilot furnaces 4# and 5# needs to be controlled between 1.02 and 1.10.

[0063] Branch three enters the gas mixing device 39 in sequence through pipeline 31, regulating valve 32, flow meter 33, and pressure gauge 34. At the same time, hydrogen enters the gas mixing device 39 through pipeline 35, regulating valve 36, flow meter 37, and pressure gauge 38 to mix with natural gas. Since the 6# and 7# small furnaces require a strong oxidizing flame, the glass melt is clarified in this area. The volume ratio of hydrogen in the hydrogen-blended natural gas fuel in this branch can be controlled at 30% to 60%. The mixed fuel mixed by the gas mixing device 39 enters the three-level branch assembly through pipeline 40 and regulating valve 41, and is transported to the 6# and 7# small furnaces through pipeline 42, regulating valve 43, and pressure gauge 44. The excess air coefficient configured for the 6# and 7# small furnaces needs to be controlled at approximately 1.15.

[0064] After the implementation of this technology, CO2 emissions from float glass furnace flue gas were reduced by about 12%, and the furnace flame atmosphere met the glass melting requirements.

[0065] In summary:

[0066] 1. The present invention divides the fuel system into three-stage fuel supply modules. The first-stage module controls the natural gas fuel source, the second-stage module controls the fuel hydrogen blending ratio, and the third-stage module regulates the flow and pressure of the fuel entering the glass melting furnace for combustion. This allows for precise and effective control of the flame atmosphere in the glass melting furnace during hydrogen combustion to reduce CO2 emissions.

[0067] 2. The present invention has wide applicability and provides a specific technical solution for the efficient utilization of hydrogen energy in float glass melting furnaces. This solution can be used in float glass melting furnaces fueled by natural gas, regardless of whether bottom firing or side firing is used.

[0068] 3. The present invention is simple and effective in controlling the float glass melting process. The hydrogen energy addition ratio can be flexibly changed according to the requirements of the specific glass type for the melting atmosphere, thereby realizing the effective utilization of hydrogen energy in the float glass melting furnace and improving production efficiency.

[0069] 4. The present invention utilizes hydrogen energy to reduce the amount of natural gas used, wherein the volume ratio of hydrogen added can range from 0 to 80%, and at the same time can reduce CO2 emissions generated by fuel combustion by about 0 to 30%.

[0070] It is easy for technicians to understand that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A fuel control system for a float glass melting furnace utilizing hydrogen combustion, characterized in that: It comprises a main pipeline (1), the input end of the main pipeline (1) is connected to a natural gas source, the output end of the main pipeline (1) is respectively connected to the input ends of a plurality of secondary branch pipelines, and the number of the secondary branch pipelines is adapted to the number of processes of melting float glass; The output end of each secondary branch pipeline is connected to a gas mixing device, which is also connected to a hydrogen pipeline. The inlet of the hydrogen pipeline is connected to a hydrogen gas source, and the outlet of the gas mixing device is connected to a mixed fuel pipeline. The hydrogen blending ratio of the natural gas in the gas mixing device is adapted to the flame atmosphere requirements of the process area. The output end of each mixed fuel pipeline is respectively connected to the input end of multiple three-stage output pipelines, and the output end of each three-stage output pipeline is connected to a corresponding melting furnace. The excess air coefficient in the melting furnace is adapted to the combustion temperature requirement of the process area, and the number of the melting furnaces is adapted to the production scale of float glass melting. The secondary branch pipeline specifically includes a high-temperature decomposition zone branch pipeline (3), a foam zone branch pipeline (17), and a clarification and homogenization zone branch pipeline (31); the high-temperature decomposition zone branch pipeline (3) is connected to the high-temperature decomposition zone aeration device (11), the foam zone branch pipeline (17) is connected to the foam zone aeration device (25), and the clarification and homogenization zone branch pipeline (31) is connected to the clarification and homogenization zone aeration device (39); The outlet of the high-temperature decomposition zone aeration device (11) is connected to the high-temperature decomposition zone mixed fuel pipeline (12), and a mixed fuel regulating valve (13) is provided in the middle of the high-temperature decomposition zone mixed fuel pipeline (12); the outlet of the foam zone aeration device (25) is connected to the foam zone mixed fuel pipeline (26), and a mixed fuel regulating valve (27) is provided in the middle of the foam zone mixed fuel pipeline (26); the outlet of the clarification and homogenization zone aeration device (39) is connected to the clarification and homogenization zone mixed fuel pipeline (40), and a mixed fuel regulating valve (41) is provided in the middle of the clarification and homogenization zone mixed fuel pipeline (40).

2. The fuel control system for a float glass melting furnace utilizing hydrogen combustion according to claim 1, characterized in that: A main regulating valve (2) is provided in the middle of the main pipeline (1).

3. The fuel control system for a float glass melting furnace utilizing hydrogen combustion according to claim 1, characterized in that: The branch pipe (3) of the high-temperature decomposition zone is provided with a branch regulating valve (4), a branch flow meter (5) and a branch pressure gauge (6) in the middle; the branch pipe (17) of the foam zone is provided with a branch regulating valve (18), a branch flow meter (19) and a branch pressure gauge (20) in the middle; the branch pipe (31) of the clarification and homogenization zone is provided with a branch regulating valve (32), a branch flow meter (33) and a branch pressure gauge (34) in the middle.

4. The fuel control system for a float glass melting furnace utilizing hydrogen combustion according to claim 1, characterized in that: The high-temperature decomposition zone mixing device (11) is connected to a hydrogen pipeline (7), and a hydrogen regulating valve (8), a hydrogen flow meter (9) and a hydrogen pressure gauge (10) are provided in the middle of the hydrogen pipeline (7); the foam zone mixing device (25) is connected to a hydrogen pipeline (21), and a hydrogen regulating valve (22), a hydrogen flow meter (23) and a hydrogen pressure gauge (24) are provided in the middle of the hydrogen pipeline (21); the clarification and homogenization zone mixing device (39) is connected to a hydrogen pipeline (35), and a hydrogen regulating valve (36), a hydrogen flow meter (37) and a hydrogen pressure gauge (38) are provided in the middle of the hydrogen pipeline (35).

5. The fuel control system for a float glass melting furnace utilizing hydrogen combustion according to claim 1, characterized in that: The output end of the high-temperature decomposition zone mixed fuel pipeline (12) is connected to a plurality of high-temperature decomposition zone output pipelines (14), an output regulating valve (15) and an output pressure gauge (16) are provided in the middle of the high-temperature decomposition zone output pipeline (14), and the output end of the high-temperature decomposition zone output pipeline (14) is connected to the small furnace of the high-temperature decomposition zone; The output end of the foam zone mixed fuel pipeline (26) is connected to a plurality of foam zone output pipelines (28), a second output regulating valve (29) and a second output pressure gauge (30) are provided in the middle of the foam zone output pipeline (28), and the output end of the foam zone output pipeline (28) is connected to the foam zone small furnace; The output end of the clarification and homogenization zone mixed fuel pipeline (40) is connected to a plurality of clarification and homogenization zone output pipelines (42), an output regulating valve (43) and an output pressure gauge (44) are provided in the middle of the clarification and homogenization zone output pipeline (42), and the output end of the clarification and homogenization zone output pipeline (42) is connected to the clarification and homogenization zone small furnace.

6. A fuel control method for a float glass melting furnace utilizing hydrogen combustion, using the fuel control system according to any one of claims 1 to 5, characterized in that: The steps include: S1, according to the number of float glass melting processes, the production area is divided into the high-temperature decomposition area of ​​​​glauber's salt, the foaming area and the clarification and homogenization area; S2, the natural gas main pipeline is introduced into the high-temperature decomposition zone gas mixing device, the foam zone gas mixing device and the clarification and homogenization zone gas mixing device through three secondary branch pipelines respectively; S3, according to the flame atmosphere requirements of the pyrolysis zone, by controlling the branch regulating valve 1 and the hydrogen regulating valve 1, adjusting the hydrogen content of the fuel in the gas mixing device of the pyrolysis zone; S4, according to the flame atmosphere requirements of the foam zone, by controlling the branch regulating valve 2 and the hydrogen regulating valve 2, adjusting the hydrogen content of the fuel in the foam zone mixing device; S5, according to the flame atmosphere requirements of the clarification and homogenization zone, by controlling the branch regulating valve 3 and the hydrogen regulating valve 3, adjusting the hydrogen content of the fuel in the gas mixing device of the clarification and homogenization zone; S6, according to the combustion temperature requirement of the high temperature decomposition zone, adjust the excess air coefficient in the small furnace of the high temperature decomposition zone by controlling the output regulating valve 1; S7, according to the combustion temperature requirement of the foam zone, adjust the excess air coefficient in the small furnace of the foam zone by controlling the output regulating valve 2; S8, according to the combustion temperature requirement of the clarification and homogenization zone, adjust the excess air coefficient in the small furnace of the clarification and homogenization zone by controlling the output regulating valve three.

7. The fuel control method according to claim 6, characterized in that: The high temperature decomposition zone specifically adopts a reducing flame, and the hydrogen content of the fuel in the gas mixing device of the high temperature decomposition zone is not greater than 10%; The foam zone specifically adopts a neutral flame, and the hydrogen content of the fuel in the foam zone mixing device is greater than 10% and less than 30%; The clarification and homogenization zone specifically adopts a strong oxidizing flame, and the hydrogen content of the fuel in the gas mixing device of the clarification and homogenization zone is not less than 30% and not more than 60%.

8. The fuel control method according to claim 6, characterized in that: The excess air coefficient in the small furnace of the high-temperature decomposition zone is not greater than 1.02; the excess air coefficient in the small furnace of the foaming zone is greater than 1.02 and less than 1.10; the excess air coefficient in the small furnace of the clarification and homogenization zone is not less than 1.10 and not greater than 1.15.

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