Hydrogen-doped coal gas mixed fuel heating furnace low-carbon combustion system and control method

Abstract

The present application relates to the technical field of energy-saving combustion of metallurgical industrial furnace, in particular to a low-carbon combustion system and control method of heating furnace using hydrogen-doped coal gas mixed fuel, which comprises a heating furnace, air pipeline, coal gas pipeline and hydrogen pipeline connected with the heating furnace, and preheaters of each gas pipeline. An online calorific value instrument is arranged on the pipeline before preheating of the coal gas, and an electronic flow valve is arranged on each pipeline. An electronic flow valve is also arranged on the pipeline between the outlet of each preheater and each burner of the heating furnace. The heating furnace can detect the calorific value of the coal gas in real time, adjust the flow of the coal gas and hydrogen in real time according to the production temperature requirement, keep the temperature inside the heating furnace stable, and reduce the carbon emission of the heating furnace. The control method of the present application can improve the temperature stability inside the heating furnace, is flexible in control, and can effectively reduce the carbon emission of the heating furnace.

Description

Technical Field

[0001] This invention relates to the field of energy-saving combustion technology for furnaces and kilns in the metallurgical industry, specifically to a low-carbon combustion system and control method for a heating furnace using hydrogen-blended coal gas mixed fuel. Background Technology

[0002] With the continuous increase in steel production in recent years, the energy consumption of the steel industry has also been increasing. Among them, metallurgical heating furnaces are very important equipment in the steel industry, accounting for a high proportion of energy consumption in the entire steel industry. Therefore, they are key equipment for promoting energy conservation and emission reduction in the steel industry.

[0003] Traditional metallurgical heating furnaces typically use coal gas as fuel. However, coal gas has a relatively low calorific value and requires large quantities. With the price of coal gas gradually rising in recent years, the operating costs of these furnaces are also increasing. Furthermore, the combustion of coal gas produces high concentrations of pollutants, necessitating alternative fuels. Hydrogen, recognized as an environmentally friendly gas, boasts a high calorific value, low demand, and produces fewer pollutants, making it a popular choice for fuel.

[0004] However, existing heating furnace combustion systems lack a reasonable solution for utilizing hydrogen-blended coal gas as a mixed fuel, resulting in poor furnace temperature stability and insufficient carbon emission reduction, making it difficult to achieve the expected results. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a low-carbon combustion system and control method for a heating furnace using hydrogen-blended coal gas as a mixed fuel, which can improve the temperature stability inside the heating furnace and effectively reduce the carbon emissions of the heating furnace, in order to address the shortcomings of the existing technology.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0007] I. A low-carbon combustion system for a heating furnace using hydrogen-blended coal gas as fuel

[0008] This invention provides a low-carbon combustion system for a heating furnace using hydrogen-blended coal gas as a mixed fuel. The system mainly includes an air pipeline 1, a hydrogen pipeline 4, a coal gas pipeline 6, and a heating furnace 13. An air preheater 3 is installed on the air pipeline 1, a hydrogen preheater 5 is installed on the hydrogen pipeline 4, and an online coal gas calorific value analyzer 7 and a coal gas preheater 8 are installed on the coal gas pipeline 6. The heating furnace 13 has a primary heating section, a secondary heating section, and a homogenizing section, each equipped with a primary heating section burner 10, a secondary heating section burner 11, and a homogenizing section burner 12, respectively.

[0009] The output of the air preheater 3 is connected to the input of the first-stage burner 10, the second-stage burner 11, and the soaking section burner 12, respectively; the output of the hydrogen preheater 5 is directly connected to the input of the soaking section burner 12; the outputs of the hydrogen preheater 5 and the gas preheater 8 are connected to the input of the first-stage burner 10 after passing through the first hydrogen-gas mixer 9; the outputs of the hydrogen preheater 5 and the gas preheater 8 are connected to the input of the second-stage burner 11 after passing through the second hydrogen-gas mixer 29.

[0010] The air preheater 3, hydrogen preheater 5, online calorific value analyzer 7, and gas preheater 8 are all electrically connected to the combustion system controller.

[0011] Preferably, a first electronic flow valve 2 is provided between the air pipeline 1 and the air preheater 3, a second electronic flow valve 19 is provided between the hydrogen pipeline 4 and the hydrogen preheater 5, and a third electronic flow valve 20 is provided between the gas pipeline 6 and the gas preheater 8, and the first electronic flow valve 2, the second electronic flow valve 19, and the third electronic flow valve 20 are all electrically connected to the combustion system controller.

[0012] Preferably, a fourth electronic flow valve 21, a sixth electronic flow valve 23, and a ninth electronic flow valve 26 are respectively provided between the output end of the air preheater 3 and the input ends of the first-stage burner 10, the second-stage burner 11, and the soaking section burner 12, and the fourth electronic flow valve 21, the sixth electronic flow valve 23, and the ninth electronic flow valve 26 are all electrically connected to the combustion system controller.

[0013] Preferably, a fifth electronic flow valve 22 is provided between the output end of the hydrogen preheater 5 and the input end of the homogenizing section burner 12, and a seventh electronic flow valve 24 and a tenth electronic flow valve 27 are respectively provided between the output end of the hydrogen preheater 5 and the first hydrogen-gas mixer 9 and the second hydrogen-gas mixer 29, and the fifth electronic flow valve 22, the seventh electronic flow valve 24, and the tenth electronic flow valve 27 are all electrically connected to the combustion system controller.

[0014] Preferably, an eighth electronic flow valve 25 and an eleventh electronic flow valve 28 are respectively provided between the output end of the gas preheater 8 and the first hydrogen gas mixer 9 and the second hydrogen gas mixer 29, and the eighth electronic flow valve 25 and the eleventh electronic flow valve 28 are electrically connected to the combustion system controller.

[0015] Preferably, both the first hydrogen gas mixer 9 and the second hydrogen gas mixer 29 are provided with porous media material 14.

[0016] Preferably, an igniter 15 is provided at the center of both the first-stage burner 10 and the second-stage burner 11. The outer ring of the igniter 15 is provided with a circular primary air pipe 16, a hydrogen-coal gas mixture pipe 17 and a secondary air pipe 18 from the inside to the outside.

[0017] II. A control method for a low-carbon combustion system in a heating furnace

[0018] Based on the same inventive concept, the present invention also provides a control method for the low-carbon combustion system of the heating furnace as described above, specifically including the following steps:

[0019] S1, open the electronic flow valves corresponding to the air preheater and air pipeline, so that the preheated air is delivered to the first stage burner, the second stage burner, and the soaking stage burner respectively;

[0020] S2, open the electronic flow valves corresponding to the hydrogen preheater and hydrogen pipeline, so that the preheated hydrogen is supplied at the initial temperature T. 氢0 and initial flow Q 氢0 They are respectively fed to the first-stage burner, the second-stage burner, and the soaking burner;

[0021] S3, open the electronic flow valves corresponding to the gas preheater and gas pipeline, so that the preheated gas flows at the initial temperature T. 煤0 and initial flow Q 煤0 They are respectively fed to the first-stage burner and the second-stage burner;

[0022] S4. Based on the production target temperatures of the first heating section, the second heating section, and the homogenization section of the heating furnace, adaptive control of hydrogen preheating temperature and flow rate is performed through the electronic flow valves corresponding to the hydrogen preheater and the hydrogen pipeline.

[0023] S5, based on the production target temperature and gas calorific value detection results of the first and second heating sections of the heating furnace, adaptive control of gas preheating temperature and flow rate is performed through the electronic flow valves corresponding to the gas preheater and gas pipeline.

[0024] Preferably, the hydrogen preheating temperature and flow rate are adaptively controlled as follows:

[0025] T 氢 = (T1+T2+T3)×3%

[0026] Q 氢1 =Q 氢0 ×K1

[0027] Q 氢2 =Q 氢0 ×K2

[0028] Q 氢3 =Q 氢0 ×K3

[0029] In the formula, T 氢 Q represents the real-time preheating temperature of the hydrogen preheater. 氢1 Q 氢2 Q 氢3 T1, T2, and T3 represent the real-time hydrogen flow rates supplied to the first-stage burner, the second-stage burner, and the soaking-heat burner, respectively. T1, T2, and T3 represent the production target temperatures of the first-stage burner, the second-stage burner, and the soaking-heat burner, respectively. K1, K2, and K3 represent the flow rate correction coefficients that are proportional to the production target temperatures of the first-stage burner, the second-stage burner, and the soaking-heat burner, respectively.

[0030] Preferably, the gas preheating temperature and flow rate are adaptively controlled as follows:

[0031] T 煤 = (T1+T2)×5%

[0032] Q 煤1 =Q 煤0 ×K1×C

[0033] Q 煤2 =Q 煤0 ×K2×C

[0034] In the formula, T 煤 Q represents the real-time preheating temperature of the gas preheater. 煤1 Q 煤2 These are the real-time flow rates of the gas supplied to the first and second stage burners, respectively, and C is the flow correction coefficient that is proportional to the gas calorific value detection result.

[0035] Compared with the prior art, the present invention has the following main advantages:

[0036] 1. This invention proposes a low-carbon combustion system for a hydrogen-blended coal gas mixed fuel heater, including a heater, an air pipeline, a coal gas pipeline and a hydrogen pipeline connected to the heater, and preheaters for each gas pipeline. An online calorific value meter is installed on the coal gas pipeline before preheating, and an electronic flow valve is installed on each pipeline. An electronic flow valve is also installed on the pipeline between the outlet of each preheater and each burner of the heater. The heater can monitor the calorific value of the coal gas in real time and adjust the flow rate of coal gas and hydrogen in real time according to the production temperature requirements to maintain a stable temperature inside the heater, thereby improving production efficiency and product quality.

[0037] 2. This invention proposes a control method for a low-carbon combustion system of a heating furnace. By combining adaptive control of hydrogen preheating temperature and flow rate with adaptive control of coal gas preheating temperature and flow rate, the temperature stability inside the heating furnace can be improved, and the control is flexible, which can effectively reduce the carbon emissions of the heating furnace. Attached Figure Description

[0038] Figure 1This is an overall schematic diagram of the low-carbon combustion system of the heating furnace for hydrogen-blended coal gas mixed fuel in an embodiment of the present invention;

[0039] Figure 2 This is a schematic diagram of a hydrogen-gas mixer in an embodiment of the present invention;

[0040] Figure 3 This is a cross-sectional view of the first and second stage burners in an embodiment of the present invention;

[0041] Figure 4 This is a flowchart of the control method in an embodiment of the present invention.

[0042] In the diagram: 1-Air pipeline, 2-First electronic flow valve, 3-Air preheater, 4-Hydrogen pipeline, 5-Hydrogen preheater, 6-Gas pipeline, 7-Gas online calorific value analyzer, 8-Gas preheater, 9-First hydrogen-gas mixer, 10-First stage burner, 11-Second stage burner, 12-Soaking zone burner, 13-Heating furnace, 14-Porous media material, 15-Igniter, 16-First stage air pipeline, 17-Hydrogen-gas mixture pipeline, 18-Second stage air pipeline, 19-Second electronic flow valve, 20-Third electronic flow valve, 21-Fourth electronic flow valve, 22-Fifth electronic flow valve, 23-Sixth electronic flow valve, 24-Seventh electronic flow valve, 25-Eighth electronic flow valve, 26-Ninth electronic flow valve, 27-Tenth electronic flow valve, 28-Eleventh electronic flow valve, 29-Second hydrogen-gas mixer. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be 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 illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0044] It should be noted that, depending on the implementation needs, the various steps / components described in this application can be broken down into more steps / components, or two or more steps / components or parts of the operation of steps / components can be combined into new steps / components to achieve the purpose of this invention.

[0045] Example 1: This example provides a low-carbon combustion system for a furnace using hydrogen-blended coal gas as fuel, such as... Figures 1-3 As shown, it mainly includes gas pipelines, online gas calorific value analyzers, electronic flow valves, gas preheaters, air pipelines, air preheaters, hydrogen pipelines, hydrogen preheaters, hydrogen-gas mixers, as well as heating furnaces and burners for different heating sections of the heating furnaces.

[0046] A heating furnace is generally divided into a preheating section, a primary heating section, a secondary heating section, and a soaking section. The preheating section does not have burners, while the primary, secondary, and soaking sections all have burners, and the temperature in these heating sections gradually increases. Since the calorific value of coal gas is lower than that of hydrogen and fluctuates in real time, this invention adds hydrogen to the primary and secondary heating sections of the heating furnace to mix with the coal gas for combustion, which can greatly maintain the stability of the flame shape and temperature. When the heating furnace is operating normally, the coal gas calorific value analyzer first detects the calorific value of the coal gas supplied by the gas plant in real time. Based on the coal gas calorific value detection results and production temperature requirements, the flow rates of coal gas, hydrogen, and air in the primary and secondary heating sections are adjusted in real time. Then, the coal gas and hydrogen are fully mixed through a hydrogen-coal gas mixer before being delivered to the burners for combustion. This greatly maintains the stability of the flame shape and heating temperature within the furnace. Since the soaking zone requires the highest temperature, only hydrogen is used as fuel in order to heat the steel billet more evenly. The hydrogen flow rate is adjusted by an electronic flow valve according to the on-site production temperature requirements. After being preheated by a hydrogen preheater, the hydrogen is directly delivered to the soaking zone for combustion. This combustion method ensures that the flame shape and flame temperature in the soaking zone do not fluctuate, and the structure of the burner can reduce the generation of high-temperature NOx.

[0047] Example 2: This example provides a low-carbon combustion system for a furnace using hydrogen-blended coal gas as a mixed fuel.

[0048] When the heating furnace is operating normally, the gas calorific value analyzer first detects the calorific value of the gas supplied by the gas plant in real time. Based on the gas calorific value detection results and production temperature requirements, it adjusts the flow rates of gas, hydrogen, and air in the first and second heating stages in real time. Then, the gas and hydrogen are preheated in a preheater, thoroughly mixed in a hydrogen-gas mixer, and then delivered to the burners for combustion. Since the soaking zone requires the highest temperature, to ensure more uniform heating of the steel billet, only hydrogen is used as fuel in the soaking zone. The flow rates of hydrogen and air are adjusted by electronic flow valves according to the on-site production temperature requirements. Hydrogen, after preheating in the preheater, is directly delivered to the soaking zone for combustion. Specifically:

[0049] (1) The temperature of the first heating section, the second heating section and the homogenization section gradually increases, and the calorific value of hydrogen is higher than that of coal gas. Therefore, the hydrogen-to-coal gas flow ratio in the second heating section is higher than that in the first heating section.

[0050] (2) The hydrogen-gas mixers in the first and second stages are filled with porous media materials to make the gas mixture more uniform.

[0051] (3) Since hydrogen has a high calorific value and is prone to producing high-temperature NOx, the burner structure is set as follows: the igniter is located in the center of the primary air pipe, the hydrogen and coal gas mixture pipe surrounds the primary air pipe, and the secondary air pipe surrounds the hydrogen and coal gas mixture pipe. This can greatly avoid the generation of high-temperature NOx.

[0052] (4) Compared with traditional heating furnaces, a large amount of hydrogen is used in the fuel, which greatly reduces the emission of CO2 in the flue gas.

[0053] Example 3: Based on the same inventive concept, this example also provides a control method for the low-carbon combustion system of the heating furnace as described above, such as... Figure 4 As shown, the specific steps include the following:

[0054] S1, open the electronic flow valves corresponding to the air preheater and air pipeline, so that the preheated air is delivered to the first stage burner, the second stage burner, and the soaking stage burner respectively;

[0055] S2, open the electronic flow valves corresponding to the hydrogen preheater and hydrogen pipeline, so that the preheated hydrogen is supplied at the initial temperature T. 氢0 and initial flow Q 氢0 They are respectively fed to the first-stage burner, the second-stage burner, and the soaking burner;

[0056] S3, open the electronic flow valves corresponding to the gas preheater and gas pipeline, so that the preheated gas flows at the initial temperature T. 煤0 and initial flow Q 煤0 They are respectively fed to the first-stage burner and the second-stage burner;

[0057] S4. Based on the production target temperatures of the first heating section, the second heating section, and the homogenization section of the heating furnace, adaptive control of hydrogen preheating temperature and flow rate is performed through the electronic flow valves corresponding to the hydrogen preheater and the hydrogen pipeline.

[0058] S5, based on the production target temperature and gas calorific value detection results of the first and second heating sections of the heating furnace, adaptive control of gas preheating temperature and flow rate is performed through the electronic flow valves corresponding to the gas preheater and gas pipeline.

[0059] Preferably, the hydrogen preheating temperature and flow rate are adaptively controlled as follows:

[0060] T 氢 = (T1+T2+T3)×3%

[0061] Q 氢1 =Q 氢0 ×K1

[0062] Q 氢2 =Q 氢0 ×K2

[0063] Q 氢3 =Q 氢0 ×K3

[0064] In the formula, T 氢 Q represents the real-time preheating temperature of the hydrogen preheater. 氢1 Q 氢2 Q氢3 T1, T2, and T3 represent the real-time hydrogen flow rates supplied to the first-stage burner, the second-stage burner, and the soaking-heat burner, respectively. T1, T2, and T3 represent the production target temperatures of the first-stage burner, the second-stage burner, and the soaking-heat burner, respectively. K1, K2, and K3 represent the flow rate correction coefficients that are proportional to the production target temperatures of the first-stage burner, the second-stage burner, and the soaking-heat burner, respectively.

[0065] Preferably, the gas preheating temperature and flow rate are adaptively controlled as follows:

[0066] T 煤 = (T1+T2)×5%

[0067] Q 煤1 =Q 煤0 ×K1×C

[0068] Q 煤2 =Q 煤0 ×K2×C

[0069] In the formula, T 煤 Q represents the real-time preheating temperature of the gas preheater. 煤1 Q 煤2 These are the real-time flow rates of the gas supplied to the first and second stage burners, respectively, and C is the flow correction coefficient that is proportional to the gas calorific value detection result.

[0070] Furthermore, all parts of this application that are not described in detail are the same as or implemented using existing technology.

[0071] In summary:

[0072] 1. This invention proposes a low-carbon combustion system for a hydrogen-blended coal gas mixed fuel heater, including a heater, an air pipeline, a coal gas pipeline and a hydrogen pipeline connected to the heater, and preheaters for each gas pipeline. An online calorific value meter is installed on the coal gas pipeline before preheating, and an electronic flow valve is installed on each pipeline. An electronic flow valve is also installed on the pipeline between the outlet of each preheater and each burner of the heater. The heater can monitor the calorific value of the coal gas in real time and adjust the flow rate of coal gas and hydrogen in real time according to the production temperature requirements to maintain a stable temperature inside the heater, thereby improving production efficiency and product quality.

[0073] 2. This invention proposes a control method for a low-carbon combustion system of a heating furnace. By combining adaptive control of hydrogen preheating temperature and flow rate with adaptive control of coal gas preheating temperature and flow rate, the temperature stability inside the heating furnace can be improved, and the control is flexible, which can effectively reduce the carbon emissions of the heating furnace.

[0074] Those skilled in the art will readily understand that the above description is merely 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 within the scope of protection of the present invention.

Claims

1. A low-carbon combustion system for a furnace using hydrogen-blended coal gas as fuel, characterized in that, It includes an air pipeline (1), a hydrogen pipeline (4), a gas pipeline (6), and a heating furnace (13). The air pipeline (1) is equipped with an air preheater (3), the hydrogen pipeline (4) is equipped with a hydrogen preheater (5), the gas pipeline (6) is equipped with a gas online calorific value analyzer (7) and a gas preheater (8), and the heating furnace (13) is equipped with a first-stage burner (10), a second-stage burner (11), and a soaking section burner (12) in the first-stage, second-stage, and soaking sections, respectively. The output end of the air preheater (3) is connected to the input ends of the first-stage burner (10), the second-stage burner (11), and the soaking section burner (12), respectively; the output end of the hydrogen preheater (5) is directly connected to the input end of the soaking section burner (12); the output ends of the hydrogen preheater (5) and the gas preheater (8) are connected to the input end of the first-stage burner (10) after passing through the first hydrogen-gas mixer (9); the output ends of the hydrogen preheater (5) and the gas preheater (8) are connected to the input end of the second-stage burner (11) after passing through the second hydrogen-gas mixer (29); The air preheater (3), hydrogen preheater (5), online calorific value analyzer (7), and gas preheater (8) are all electrically connected to the combustion system controller.

2. The low-carbon combustion system for a heating furnace using hydrogen-blended coal gas as a mixed fuel according to claim 1, characterized in that, A first electronic flow valve (2) is provided between the air pipeline (1) and the air preheater (3), a second electronic flow valve (19) is provided between the hydrogen pipeline (4) and the hydrogen preheater (5), and a third electronic flow valve (20) is provided between the gas pipeline (6) and the gas preheater (8). The first electronic flow valve (2), the second electronic flow valve (19), and the third electronic flow valve (20) are all electrically connected to the combustion system controller.

3. The low-carbon combustion system for a heating furnace using hydrogen-blended coal gas as a mixed fuel according to claim 1, characterized in that, The output end of the air preheater (3) is provided with a fourth electronic flow valve (21), a sixth electronic flow valve (23), and a ninth electronic flow valve (26) between the output end of the first-stage burner (10), the second-stage burner (11), and the input end of the heat spreader burner (12), and the fourth electronic flow valve (21), the sixth electronic flow valve (23), and the ninth electronic flow valve (26) are all electrically connected to the combustion system controller.

4. The low-carbon combustion system for a heating furnace using hydrogen-blended coal gas as a mixed fuel according to claim 1, characterized in that, A fifth electronic flow valve (22) is provided between the output end of the hydrogen preheater (5) and the input end of the homogenizing section burner (12). A seventh electronic flow valve (24) and a tenth electronic flow valve (27) are respectively provided between the output end of the hydrogen preheater (5) and the first hydrogen-coal gas mixer (9) and the second hydrogen-coal gas mixer (29). The fifth electronic flow valve (22), the seventh electronic flow valve (24), and the tenth electronic flow valve (27) are all electrically connected to the combustion system controller.

5. The low-carbon combustion system for a heating furnace using hydrogen-blended coal gas as a mixed fuel according to claim 1, characterized in that, The output end of the gas preheater (8) is provided with an eighth electronic flow valve (25) and an eleventh electronic flow valve (28) between the first hydrogen gas mixer (9) and the second hydrogen gas mixer (29), respectively, and the eighth electronic flow valve (25) and the eleventh electronic flow valve (28) are electrically connected to the combustion system controller.

6. The low-carbon combustion system for a heating furnace using hydrogen-blended coal gas as a mixed fuel according to claim 1, characterized in that, Both the first hydrogen gas mixer (9) and the second hydrogen gas mixer (29) are provided with porous media material (14).

7. The low-carbon combustion system for a heating furnace using hydrogen-blended coal gas as a mixed fuel according to claim 1, characterized in that, Ignition devices (15) are provided at the center of both the first-stage burner (10) and the second-stage burner (11). The outer ring of the ignition device (15) is provided with a circular primary air pipe (16), a hydrogen-coal gas mixture pipe (17), and a secondary air pipe (18) from the inside to the outside.

8. A control method for a low-carbon combustion system of a heating furnace according to any one of claims 1 to 7, characterized in that, Includes the following steps: S1, open the electronic flow valves corresponding to the air preheater and air pipeline, so that the preheated air is delivered to the first stage burner, the second stage burner, and the soaking stage burner respectively; S2, open the electronic flow valves corresponding to the hydrogen preheater and hydrogen pipeline, so that the preheated hydrogen is supplied at the initial temperature T. 氢0 and initial flow Q 氢0 They are respectively fed to the first-stage burner, the second-stage burner, and the soaking burner; S3, open the electronic flow valves corresponding to the gas preheater and gas pipeline, so that the preheated gas flows at the initial temperature T. 煤0 and initial flow Q 煤0 They are respectively fed to the first-stage burner and the second-stage burner; S4. Based on the production target temperatures of the first heating section, the second heating section, and the homogenization section of the heating furnace, adaptive control of hydrogen preheating temperature and flow rate is performed through the electronic flow valves corresponding to the hydrogen preheater and the hydrogen pipeline. S5, based on the production target temperature and gas calorific value detection results of the first and second heating sections of the heating furnace, adaptive control of gas preheating temperature and flow rate is performed through the electronic flow valves corresponding to the gas preheater and gas pipeline.

9. The control method according to claim 8, characterized in that, The adaptive control of hydrogen preheating temperature and flow rate is as follows: T 氢 (T1+T2+T3)×3% Q 氢1 =Q 氢0 ×K1 Q 氢2 =Q 氢0 ×K2 Q 氢3 =Q 氢0 ×K3 In the formula, T 氢 Q represents the real-time preheating temperature of the hydrogen preheater. 氢1 Q 氢2 Q 氢3 T1, T2, and T3 represent the real-time hydrogen flow rates supplied to the first-stage burner, the second-stage burner, and the soaking-heat burner, respectively. T1, T2, and T3 represent the production target temperatures of the first-stage burner, the second-stage burner, and the soaking-heat burner, respectively. K1, K2, and K3 represent the flow rate correction coefficients that are proportional to the production target temperatures of the first-stage burner, the second-stage burner, and the soaking-heat burner, respectively.

10. The control method according to claim 8, characterized in that, The adaptive control of the gas preheating temperature and flow rate is as follows: T 煤 =(T1+T2)×5% Q 煤1 =Q 煤0 ×K1×C Q 煤2 =Q 煤0 ×K2×C In the formula, T 煤 Q represents the real-time preheating temperature of the gas preheater. 煤1 Q 煤2 These are the real-time flow rates of the gas supplied to the first and second stage burners, respectively, and C is the flow correction coefficient that is proportional to the gas calorific value detection result.

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