Steel rolling heating furnace hydrogen combustion system and control method thereof

Abstract

The invention relates to the technical field of steel rolling heating furnaces, in particular to a steel rolling heating furnace hydrogen combustion system and a control method thereof. The hydrogen embrittlement resisting composite pipeline structure is adopted, the hydrogen embrittlement resisting performance of the pipeline can be effectively improved, and hydrogen transportation safety is guaranteed; a pipeline monitoring controller is matched, so that accurate control and real-time monitoring of the hydrogen transportation process are realized; by adopting the four-order premixing dynamic combustor and combining an air-fuel ratio optimization algorithm, parameters of the combustor can be dynamically adjusted according to actual working conditions, and combustion efficiency and stability are improved. By monitoring the temperature field and the combustion efficiency of the heating furnace in real time, the combustion state in the furnace can be mastered in real time, efficient utilization of waste heat is achieved through application of a waste heat recovery and intelligent reversing method, and the overall energy efficiency of the system is improved. The safety, efficiency and energy efficiency of hydrogen combustion can be greatly improved, the device can be applied to an existing steel rolling heating furnace, the purpose of reducing CO2 emission is achieved, and the device is wide in application prospect and easy to popularize.

Description

Technical Field

[0001] The present invention relates to the technical field of steel rolling heating furnaces, and in particular to a hydrogen combustion system of a steel rolling heating furnace and a control method thereof. Background Art

[0002] In the steel rolling industry, heating furnaces are critical equipment for heating steel billets. The efficiency, safety, and environmental performance of their combustion systems directly impact rolled steel quality and energy costs. The use of clean fuels, such as hydrogen, in steel rolling furnaces is one of the primary approaches to decarbonizing and reducing heating furnace emissions. While hydrogen combustion offers advantages such as zero carbon emissions and high calorific value, its unique physical and chemical properties pose significant challenges to combustion system design.

[0003] The existing steel rolling heating furnace combustion system is mainly composed of blast furnace gas, coke oven gas, coke oven gas or a mixture of the three, or purchased natural gas. Hydrogen molecules are small and easy to leak, flammable and explosive, with a fast combustion speed, prone to backfire and flame shape change. The main technical bottlenecks of adding a hydrogen combustion system to the heating furnace are: Insufficient safety in gas pipeline transportation: Traditional metal pipelines are prone to hydrogen embrittlement and cracking in high-pressure hydrogen environments, leading to leakage risks; the existing monitoring system has a delayed response to pressure, flow and temperature fluctuations during hydrogen transportation, making it difficult to achieve precise control and posing a safety hazard.

[0004] The efficiency and stability of hydrogen combustion need to be improved: Conventional heating furnace burners mostly use a fixed premixing structure, which cannot dynamically adjust the air-fuel ratio according to the operating conditions in the furnace, easily causing problems such as incomplete combustion and unstable flame, leading to increased energy consumption and pollutant emissions.

[0005] Extensive furnace status monitoring and energy efficiency utilization: Traditional monitoring methods can only obtain single-point temperature data, lacking real-time quantitative assessment of the furnace temperature field and combustion efficiency; the waste heat recovery system relies on a fixed switching cycle and cannot intelligently match the combustion status, resulting in a large amount of waste heat resources being wasted.

[0006] While existing technologies have attempted to improve system performance through material improvements or local control optimization, they have yet to develop a comprehensive, comprehensive solution encompassing transportation, combustion, monitoring, and energy recovery. Therefore, there is an urgent need to develop a safe, efficient, and intelligent hydrogen combustion system for steel rolling mill heating furnaces to meet the needs of the green metallurgical industry. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a hydrogen combustion system for a steel rolling heating furnace and a control method thereof, which can realize the full process optimization of hydrogen transportation, combustion control, furnace monitoring and waste heat recovery, and can greatly improve the safety, efficiency and energy efficiency of hydrogen combustion.

[0008] In order to solve the above technical problems, the technical solution adopted by the present invention is: 1. A hydrogen combustion system for a steel rolling heating furnace The present invention provides a hydrogen combustion system for a steel rolling heating furnace, which mainly includes: a pipeline monitoring and control module, a hydrogen burner, a multi-dimensional monitoring module in the furnace, and a waste heat recovery and intelligent reversing module; the pipeline transportation and monitoring control module includes a hydrogen transportation pipeline 23 and a pipeline monitoring controller 19, one end of the hydrogen transportation pipeline 23 is connected to the hydrogen gas source through a compressor 1, and the other end is connected to the hydrogen burner 8 of the heating furnace 9, the heating furnace 9 is provided with a multi-dimensional monitoring module in the furnace, and the flue gas outlet of the heating furnace 9 is connected to the waste heat recovery and intelligent reversing module through a flue gas exhaust pipeline 11, and the pipeline monitoring controller 19, the multi-dimensional monitoring module in the furnace and the waste heat recovery and intelligent reversing module are all electrically connected to the central server 16.

[0009] Preferably, the hydrogen transport pipeline 23 is provided with a pressure reducing valve group 2, a flow meter 3, a flame arrester 4, a gas-liquid separation tank 5, a filter 6 and a hydrogen flow regulating valve 7 in sequence, and a pressure sensor 20, a temperature sensor 21 and a leakage monitoring sensor 22 are installed in sequence at intervals of a preset length on the hydrogen transport pipeline 23; The pressure reducing valve group 2 , the flow meter 3 , the hydrogen flow regulating valve 7 , the pressure sensor 20 , the temperature sensor 21 and the leakage monitoring sensor 22 are all electrically connected to the pipeline monitoring controller 19 .

[0010] Preferably, the hydrogen transport pipeline 23 is a three-layer composite structure, which includes, from inside to outside: a nickel-based alloy corrosion-resistant layer, a carbon fiber reinforced resin-based anti-hydrogen embrittlement reinforcement layer, and a high-hardness stainless steel wear-resistant protective layer. Each layer of the pipeline is formed by a hot pressing composite process, and the connection is sealed with a metal-resin transition joint.

[0011] Preferably, the hydrogen burner 8 is a four-stage premixing dynamic burner, which includes a first premixing section, a second premixing section, a third premixing section and a fourth premixing section connected in sequence, and each premixing section is provided with a hydrogen inlet and an air inlet; The first premixing section has a spiral guide vane on its inner wall, and its hydrogen inlet and air inlet are arranged at opposite tangents to form turbulent mixing. The second and third premixing sections both have built-in Venturi tubes, and their throats are equipped with atomizing nozzles to achieve gas-liquid shear mixing through the Venturi effect. The fourth premixing section has a smooth inner wall, and a flow stabilizer is provided at its outlet to ensure that the uniformity deviation of the mixed gas flow rate is within the budget range. The hydrogen inlet and the air inlet are both provided with electric regulating ball valves, and the opening of each ball valve is adjusted in stages according to the dynamic air-fuel ratio optimization algorithm so that the mixed gas in each premixing section has a concentration gradient distribution.

[0012] Preferably, the dynamic air-fuel ratio optimization algorithm includes: collecting the operating parameters of the burner and constructing an air-fuel ratio prediction model based on the LSTM neural network, outputting the optimal air-fuel ratio through historical data training, and adjusting the opening of the hydrogen and air inlet ball valves of each premixing section according to the optimal air-fuel ratio to perform dynamic optimization adjustment of the air-fuel ratio.

[0013] Preferably, the operating parameters of the burner include hydrogen flow rate, air flow rate, combustion temperature and combustion efficiency; The air-fuel ratio prediction model is constructed, comprising: Based on the current burner operating parameters and control sequences , predict the air-fuel ratio:

[0014] Among them, the control input is: , Operating parameters , A(t) Air flow ,F(t) is the hydrogen flow rate, T(t) is the combustion temperature.

[0015] Preferably, the multi-dimensional monitoring module in the furnace includes a flame online monitoring device 24 and a temperature and pressure online monitoring device 25. The flame online monitoring device 24 and the temperature and pressure online monitoring device 25 collect data through multiple sampling points 10 evenly arranged on the inner wall of the heating furnace 9 to monitor the temperature field distribution state in the furnace in real time, and cooperate with the flue gas composition and temperature online monitoring device 12 provided on the flue gas exhaust pipeline 11 to monitor the combustion efficiency of the heating furnace in real time and generate a combustion efficiency cloud map.

[0016] Preferably, the waste heat recovery and intelligent reversing module includes a heat exchanger 13, in which a flue gas heat exchange channel and an air heat exchange channel are provided, which are respectively used to recover the heat of the flue gas discharged from the heating furnace 9 and preheat the air entering the hydrogen burner 8.

[0017] The inlet of the air heat exchange channel is connected to an air source, and the outlet of the air heat exchange channel is connected to the input end of a reversing regulating valve 26 via an induced draft fan 17. The two output ends of the reversing regulating valve 26 are respectively connected to an air delivery pipe and an air return pipe; the air delivery pipe is connected to the hydrogen burner 8, and the air return pipe is connected to the inlet of the air heat exchange channel. An air flow regulating valve 14 and an air flow regulating valve 2 15 are respectively installed on the air return pipe and the air delivery pipe. The inlet of the flue gas heat exchange channel is connected to the flue gas exhaust pipeline 11 of the heating furnace 9, the outlet of the flue gas heat exchange channel is connected to the input end of the reversing regulating valve 27, and the two output ends of the reversing regulating valve 27 are respectively connected to the exhaust chimney and the flue gas return pipe; the flue gas return pipe is connected to the inlet of the flue gas heat exchange channel, and the flue gas return pipe is provided with an induced draft fan 2 18.

[0018] 2. A control method for the hydrogen combustion system of a steel rolling heating furnace Based on the same inventive concept, the present invention also provides a method for controlling the hydrogen combustion system of the steel rolling heating furnace as described above, comprising the following steps: S1, collects the flow, temperature, pressure and leakage data of the hydrogen transport pipeline in real time through the pipeline monitoring controller, and controls the opening of the hydrogen flow regulating valve to adjust the hydrogen flow input to the burner in real time; S2, based on the dynamic air-fuel ratio optimization algorithm, gradedly adjusts the opening of the hydrogen and air inlet ball valves of each premixing section of the fourth-stage premixed burner to perform dynamic optimization of the air-fuel ratio; S3, monitors the temperature distribution in the heating furnace in real time through the multi-dimensional monitoring module inside the furnace, and calculates the combustion efficiency of the heating furnace in real time by combining the flue gas composition and temperature online monitoring device on the flue gas exhaust pipeline; S4, by adjusting the reversing control valve 1 and the reversing control valve 2 of the waste heat recovery and intelligent reversing module, performs intelligent reversing control of flue gas and air to improve the waste heat recovery efficiency.

[0019] The intelligent switching control of flue gas and air includes: 1) When the air temperature at the outlet of the air heat exchange channel is lower than the preset air temperature threshold, the opening ratio of one or two output ends of the reversing control valve is adjusted to return the preset proportion of air to the heat exchanger through the air return pipe for secondary preheating; 2) When the flue gas temperature at the outlet of the flue gas heat exchange channel is higher than the preset flue gas temperature threshold, the opening ratio of the two output ends of the reversing regulating valve 2 is adjusted to return the preset proportion of flue gas to the heat exchanger through the flue gas return pipe for secondary recovery of flue gas waste heat.

[0020] Compared with the prior art, the present invention has the following main advantages: 1. The present invention adopts a hydrogen embrittlement-resistant composite pipeline structure, which can effectively improve the pipeline's hydrogen embrittlement resistance and ensure the safety of hydrogen transportation. In combination with a pipeline monitoring controller, it can achieve precise control and real-time monitoring of the hydrogen transportation process. At the same time, by adopting a fourth-order premixed dynamic burner and combining it with an air-fuel ratio optimization algorithm, the burner parameters can be dynamically adjusted according to actual operating conditions to improve combustion efficiency and stability.

[0021] 2. The present invention monitors the temperature field and combustion efficiency of the heating furnace in real time by rationally arranging multiple sensors, and can grasp the combustion status in the furnace in real time. By applying waste heat recovery and intelligent reversing methods, the efficient utilization of waste heat is achieved, thereby improving the overall energy efficiency of the system.

[0022] 3. The present invention can significantly improve the safety, efficiency and energy efficiency of hydrogen combustion by optimizing the entire process of hydrogen transportation, combustion control, furnace monitoring and waste heat recovery. It can be applied to existing steel rolling heating furnaces to achieve the goal of reducing CO2 emissions. It has broad application prospects and is easy to promote. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is an overall schematic diagram of a hydrogen combustion system for a steel rolling heating furnace according to an embodiment of the present invention; Figure 2 Schematic diagram of the cross-sectional structure of a hydrogen transport pipeline in an embodiment of the present invention; Figure 3 This is a schematic structural diagram of a hydrogen burner in an embodiment of the present invention; Figure 4 Schematic diagram of the principle of the waste heat recovery and intelligent reversing module in an embodiment of the present invention.

[0024] In the figure: 1- compressor, 2- pressure reducing valve group, 3- flow meter, 4- flame arrester, 5- gas-liquid separation tank, 6- filter, 7- hydrogen flow regulating valve, 8- burner, 9- heating furnace, 10- sampling point, 11- flue gas exhaust pipeline, 12- flue gas composition and temperature online monitoring device, 13- heat exchanger, 14- air flow regulating valve 1, 15- air flow regulating valve 2, 16- central server, 17- induced draft fan 1, 18- induced draft fan 2, 19- pipeline monitoring controller, 20- pressure sensor, 21- temperature sensor, 22- leakage monitoring sensor, 23- hydrogen transport pipeline, 24- flame online monitoring device, 25- temperature and pressure online monitoring device, 26- reversing regulating valve 1, 27- reversing regulating valve 2. DETAILED DESCRIPTION

[0025] 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.

[0026] 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.

[0027] In the present invention, unless otherwise expressly specified or limited, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "plurality" means at least two, for example, two, three, etc., unless otherwise expressly specified or limited.

[0028] Example 1: This example provides a hydrogen combustion system for a steel rolling heating furnace. Figure 1 As shown, it mainly includes: pipeline monitoring and control module, hydrogen burner, furnace multi-dimensional monitoring module, waste heat recovery and intelligent reversing module; Among them, the pipeline transportation and monitoring control module includes a hydrogen transportation pipeline 23 and a pipeline monitoring controller 19. One end of the hydrogen transportation pipeline 23 is connected to the hydrogen gas source through the compressor 1, and the other end is connected to the hydrogen burner 8 of the heating furnace 9. The heating furnace 9 is provided with an in-furnace multi-dimensional monitoring module. The flue gas outlet of the heating furnace 9 is connected to the waste heat recovery and intelligent reversing module through the flue gas exhaust pipeline 11, and the pipeline monitoring controller 19, the in-furnace multi-dimensional monitoring module and the waste heat recovery and intelligent reversing module are all electrically connected to the central server 16.

[0029] Furthermore, the hydrogen transport pipeline 23 is provided with a pressure reducing valve group 2, a flow meter 3, a flame arrester 4, a gas-liquid separation tank 5, a filter 6 and a hydrogen flow regulating valve 7 in sequence, and a pressure sensor 20, a temperature sensor 21 and a leakage monitoring sensor 22 are installed in sequence at each preset length on the hydrogen transport pipeline 23; The pressure reducing valve group 2 , the flow meter 3 , the hydrogen flow regulating valve 7 , the pressure sensor 20 , the temperature sensor 21 and the leakage monitoring sensor 22 are all electrically connected to the pipeline monitoring controller 19 .

[0030] Furthermore, the hydrogen transport pipeline 23 is a three-layer composite structure, which includes, from the inside to the outside: a nickel-based alloy corrosion-resistant layer, a carbon fiber reinforced resin-based anti-hydrogen embrittlement reinforcement layer, and a high-hardness stainless steel wear-resistant protective layer. Each layer of the pipeline is formed by a hot pressing composite process, and the joints are sealed with metal-resin transition joints.

[0031] Furthermore, the hydrogen burner 8 adopts a four-stage premixing dynamic burner, which includes a first premixing section, a second premixing section, a third premixing section and a fourth premixing section connected in sequence, and each premixing section is provided with a hydrogen inlet and an air inlet; The first premixing section has a spiral guide vane on its inner wall, and its hydrogen inlet and air inlet are arranged at opposite tangents to form turbulent mixing. The second and third premixing sections both have built-in Venturi tubes, and their throats are equipped with atomizing nozzles to achieve gas-liquid shear mixing through the Venturi effect. The fourth premixing section has a smooth inner wall, and a flow stabilizer is provided at its outlet to ensure that the uniformity deviation of the mixed gas flow rate is within the budget range. The hydrogen inlet and the air inlet are both provided with electric regulating ball valves, and the opening of each ball valve is adjusted in stages according to the dynamic air-fuel ratio optimization algorithm so that the mixed gas in each premixing section has a concentration gradient distribution.

[0032] Furthermore, the dynamic air-fuel ratio optimization algorithm includes: collecting the operating parameters of the burner and constructing an air-fuel ratio prediction model based on the LSTM neural network, outputting the optimal air-fuel ratio through historical data training, and adjusting the opening of the hydrogen and air inlet ball valves of each premixing section according to the optimal air-fuel ratio to perform dynamic optimization adjustment of the air-fuel ratio.

[0033] Furthermore, the multi-dimensional monitoring module in the furnace includes a flame online monitoring device 24 and a temperature and pressure online monitoring device 25. The flame online monitoring device 24 and the temperature and pressure online monitoring device 25 collect data through multiple sampling points 10 evenly arranged on the inner wall of the heating furnace 9 to monitor the temperature field distribution state in the furnace in real time, and cooperate with the flue gas composition and temperature online monitoring device 12 provided on the flue gas exhaust pipeline 11 to monitor the combustion efficiency of the heating furnace in real time and generate a combustion efficiency cloud map.

[0034] Furthermore, the waste heat recovery and intelligent reversing module includes a heat exchanger 13, which is provided with a flue gas heat exchange channel and an air heat exchange channel, which are respectively used to recover the heat of the flue gas discharged from the heating furnace 9 and preheat the air entering the hydrogen burner 8.

[0035] The inlet of the air heat exchange channel is connected to an air source, and the outlet of the air heat exchange channel is connected to the input end of a reversing regulating valve 26 via an induced draft fan 17. The two output ends of the reversing regulating valve 26 are respectively connected to an air delivery pipe and an air return pipe; the air delivery pipe is connected to the hydrogen burner 8, and the air return pipe is connected to the inlet of the air heat exchange channel. An air flow regulating valve 14 and an air flow regulating valve 2 15 are respectively installed on the air return pipe and the air delivery pipe. The inlet of the flue gas heat exchange channel is connected to the flue gas exhaust pipeline 11 of the heating furnace 9, the outlet of the flue gas heat exchange channel is connected to the input end of the reversing regulating valve 27, and the two output ends of the reversing regulating valve 27 are respectively connected to the exhaust chimney and the flue gas return pipe; the flue gas return pipe is connected to the inlet of the flue gas heat exchange channel, and the flue gas return pipe is provided with an induced draft fan 2 18.

[0036] In a second embodiment, a hydrogen combustion system for a steel rolling heating furnace is provided, comprising a pipeline transport and monitoring control module, a hydrogen burner, a multi-dimensional furnace monitoring module, and a waste heat recovery and intelligent reversing module. The hydrogen transport pipeline is connected to the burner, which is connected to the heating furnace and positioned at a corresponding location within the furnace. The furnace flue gas outlet is connected to a heat exchanger, and the heat exchanger flue gas and air outlets are connected to an intelligent reversing device. The intelligent control module is connected to a central server via sensors at each node. The central server processes the generated execution signal and sends it to each actuator.

[0037] Furthermore, the output end of the pipeline transportation and monitoring control module is connected to the input end of the hydrogen burner, the hydrogen burner is installed in the furnace body of the heating furnace, and the multi-dimensional monitoring module in the furnace is distributed inside the heating furnace and at the flue gas outlet end. The three realize data interaction and collaborative control through industrial Ethernet.

[0038] Furthermore, the pipeline transport and monitoring control module includes a hydrogen transport pipeline (hydrogen embrittlement-resistant composite pipeline structure) and a pipeline monitoring controller: the hydrogen transport pipeline (hydrogen embrittlement-resistant composite pipeline structure) adopts a three-layer composite structure, from the inside to the outside: inner layer: nickel-based alloy corrosion-resistant layer, used to resist erosion by corrosive media in hydrogen; middle layer: carbon fiber reinforced resin-based hydrogen embrittlement reinforcement layer, which improves the resistance to hydrogen atom penetration through the carbon fiber orthogonal weaving process; outer layer: high-hardness stainless steel wear-resistant protective layer, which meets the mechanical strength and wear resistance requirements of the pipeline. The various layers of the pipeline are formed by a hot pressing composite process, and the joints are sealed with metal-resin transition joints, with a leakage rate of ≤1×10⁻ 9 m³ / s.

[0039] Furthermore, pressure sensors, ultrasonic flow sensors, and temperature sensors are installed every 5 meters along the axial direction of the pipeline to collect hydrogen transportation parameters in real time; the PLC controller has built-in PID and fuzzy control algorithms, which dynamically adjust the pipeline electric regulating valve according to the detection data to achieve precise control of the transportation pressure and flow; when the detection parameters exceed the safety threshold, the system automatically triggers the sound and light alarm and links the shut-off valve to close, with a response time of less than 100ms.

[0040] Furthermore, the hydrogen burner includes a four-stage premixed dynamic burner and a dynamic air-fuel ratio optimization algorithm. The main body of the four-stage premixed dynamic burner is a four-stage cylindrical cavity connected in series. The first premixing section has spiral guide vanes on the inner wall, and the hydrogen inlet and air inlet are arranged at opposite tangents to form turbulent mixing. The second and third premixing sections have built-in Venturi tubes and atomizing nozzles at the throat to enhance gas-liquid shear mixing through the Venturi effect. The fourth premixing section has a smooth inner cavity wall and a flow stabilization grid at the outlet to ensure that the uniformity deviation of the mixed gas flow rate is less than 5%. The hydrogen / air inlet of each premixing section is equipped with an electric regulating ball valve, and the mixed gas concentration gradient distribution is achieved through staged premixing.

[0041] Furthermore, the system status and air-fuel ratio are defined as follows: State variables:

[0042] in, A(t) Air flow ,F(t) is the hydrogen flow rate, T(t) is the combustion temperature.

[0043] Control input:

[0044] Air-fuel ratio:

[0045] The goal is to Tracking the optimal value (such as stoichiometric ratio).

[0046] Further, the ideal dynamic model: State transition equation:

[0047] Among them, the state transfer matrix A Under ideal conditions with no delay, it is the identity matrix I , input matrix B Characterizes the direct effect of control input on the state.

[0048] Furthermore, the model predictive control (MPC) objective function is: In the prediction domain N p Minimize the following cost function:

[0049] Where: the first term is the sum of squares of the air-fuel ratio tracking error, the second term is the control input cost, N u To control the time domain.

[0050] Furthermore, the air-fuel ratio prediction model: Based on the current state and control sequences , predict the air-fuel ratio:

[0051] Objective function:

[0052] Control input execution and status update:

[0053] Furthermore, the billet heating stage, temperature field average, hydrogen purity, and furnace pressure are obtained; an air-fuel ratio prediction model is constructed based on the LSTM neural network, and the optimal air-fuel ratio is output through historical data training; the variable frequency fan and hydrogen regulating valve at the air inlet of each premixing section are adjusted in real time according to the algorithm results to achieve dynamic air-fuel ratio matching and adapt to 20%-120% rated load fluctuations.

[0054] Furthermore, the multi-dimensional furnace monitoring module includes a temperature field monitoring device and an intelligent waste heat recovery reversing system. Sixteen infrared thermal imagers are evenly distributed on the top and side walls of the heating furnace. Combined with the furnace's thermocouple array, a distributed data fusion algorithm is used to construct a temperature field distribution with a spatial resolution of 0.5m x 0.5m. Eight flue gas analyzers are installed at the flue gas outlet to calculate combustion efficiency in real time based on combustion stoichiometry formulas and generate a combustion efficiency cloud map.

[0055] Furthermore, the heat exchanger adopts a plate-type waste heat heat exchanger, and the flue gas side and air side channels are independent. The temperature of the combustion air is raised to 300-500°C after preheating; a pneumatic sealing baffle is set at the flue gas outlet of the heat exchanger, and part of the flue gas is returned to the flue gas inlet of the heating furnace through the second induced draft fan to mix with the original flue gas for cooling; a third induced draft fan is set at the air outlet of the heat exchanger, and when the air temperature after preheating is less than 300°C, part of the low-temperature air is returned to the heat exchanger inlet to mix with fresh air; the reversing flow of flue gas and air is realized by intelligently controlling the reversing regulating valves one and two, thereby improving the waste heat recovery efficiency.

[0056] Furthermore, the drain outlet of the gas-liquid separator 5 is normally closed, and the drain valve is opened when the discharge liquid level is reached. The opening time of the drain valve is controlled by a program according to actual needs.

[0057] Furthermore, the pressure reducing valve group 2 is connected to the pipeline monitoring controller 19, and the opening of the pressure reducing valve group 2 is controlled by a program according to actual needs.

[0058] Furthermore, based on the fuzzy neural network algorithm, the commutation period is dynamically adjusted according to the combustion efficiency and flue gas temperature fluctuations, which improves the commutation efficiency by more than 20% compared with the traditional fixed period.

[0059] Furthermore, the system integrates an industrial control computer as the central processor and a built-in data storage module to store transportation parameters, combustion data, furnace monitoring data and air-fuel ratio algorithm optimization results in real time, supports historical data tracing and system self-learning optimization, and the operation interface integrates a visualization module to display the temperature field distribution in the furnace and the equipment operating status in real time.

[0060] Example 3: Based on the same inventive concept, this embodiment further provides a method for controlling the hydrogen combustion system of the steel rolling heating furnace as described above, comprising the following steps: S1, collects the flow, temperature, pressure and leakage data of the hydrogen transport pipeline in real time through the pipeline monitoring controller, and controls the opening of the hydrogen flow regulating valve to adjust the hydrogen flow input to the burner in real time; S2, based on the dynamic air-fuel ratio optimization algorithm, gradedly adjusts the opening of the hydrogen and air inlet ball valves of each premixing section of the fourth-stage premixed burner to perform dynamic optimization of the air-fuel ratio; S3, monitors the temperature distribution in the heating furnace in real time through the multi-dimensional monitoring module inside the furnace, and calculates the combustion efficiency of the heating furnace in real time by combining the flue gas composition and temperature online monitoring device on the flue gas exhaust pipeline; S4, by adjusting the reversing control valve 1 and the reversing control valve 2 of the waste heat recovery and intelligent reversing module, performs intelligent reversing control of flue gas and air to improve the waste heat recovery efficiency.

[0061] The intelligent switching control of flue gas and air includes: 1) When the air temperature at the outlet of the air heat exchange channel is lower than the preset air temperature threshold, the opening ratio of one or two output ends of the reversing control valve is adjusted to return the preset proportion of air to the heat exchanger through the air return pipe for secondary preheating; 2) When the flue gas temperature at the outlet of the flue gas heat exchange channel is higher than the preset flue gas temperature threshold, the opening ratio of the two output ends of the reversing regulating valve 2 is adjusted to return the preset proportion of flue gas to the heat exchanger through the flue gas return pipe for secondary recovery of flue gas waste heat.

[0062] Furthermore, all parts of this application that are not described in detail are the same as the existing technology or are implemented using the existing technology.

[0063] In summary, the hydrogen combustion system and control method for a steel rolling heating furnace provided by the present invention can achieve the following comprehensive benefits: 1) Significantly improved safety: Through material compounding and structural optimization, the hydrogen embrittlement-resistant composite pipeline has improved its hydrogen embrittlement resistance by more than three times compared to traditional stainless steel pipelines. Combined with the real-time control and early warning functions of the intelligent transportation monitoring system, the risk of hydrogen leakage during transportation is reduced by 80%; 2) Optimized combustion efficiency and stability: A fourth-order premixed burner, combined with an AI air-fuel ratio algorithm, achieves combustion efficiency ≥ 99% (compared to approximately 95% for traditional systems), improves flame stability by 40%, reduces NOx emissions by 30% (below 50mg / m³), and adapts to load fluctuations ranging from 20% to 120% of rated load. 3) Breakthroughs in energy efficiency and intelligence: The temperature field monitoring accuracy reaches 0.5m spatial resolution, the real-time calculation error of combustion efficiency is less than 2%, and the waste heat recovery system increases the comprehensive thermal efficiency of the heating furnace to 88% (about 80% of the traditional system), reducing energy consumption per ton of steel by more than 15%. The system achieves self-learning optimization through a closed-loop data system, reducing the frequency of manual intervention by 60%, and significantly improving the intelligence level of the steel rolling heating process.

[0064] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0065] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0066] It will be easily understood by those skilled in the art 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 in the scope of protection of the present invention.

Claims

1. A hydrogen combustion system for a steel rolling heating furnace, characterized by: The invention comprises a pipeline monitoring control module, a hydrogen burner, a furnace multi-dimensional monitoring module, and a waste heat recovery and intelligent reversing module; the pipeline transport and monitoring control module comprises a hydrogen transport pipeline (23) and a pipeline monitoring controller (19), one end of the hydrogen transport pipeline (23) is connected to a hydrogen gas source through a compressor (1), and the other end is connected to a hydrogen burner (8) of a heating furnace (9), the heating furnace (9) is provided with a furnace multi-dimensional monitoring module, the flue gas outlet of the heating furnace (9) is connected to the waste heat recovery and intelligent reversing module through a flue gas exhaust pipeline (11), and the pipeline monitoring controller (19), the furnace multi-dimensional monitoring module and the waste heat recovery and intelligent reversing module are all electrically connected to a central server (16).

2. The hydrogen combustion system for a steel rolling heating furnace according to claim 1, characterized in that: The hydrogen transport pipeline (23) is provided with a pressure reducing valve group (2), a flow meter (3), a flame arrester (4), a gas-liquid separation tank (5), a filter (6), and a hydrogen flow regulating valve (7) in sequence, and a pressure sensor (20), a temperature sensor (21), and a leakage monitoring sensor (22) are installed in sequence at intervals of a preset length on the hydrogen transport pipeline (23); The pressure reducing valve group (2), flow meter (3), hydrogen flow regulating valve (7), pressure sensor (20), temperature sensor (21) and leakage monitoring sensor (22) are all electrically connected to the pipeline monitoring controller (19).

3. The hydrogen combustion system for a steel rolling heating furnace according to claim 2, characterized in that: The hydrogen transport pipeline (23) is a three-layer composite structure, which comprises, from the inside to the outside, a nickel-based alloy corrosion-resistant layer, a carbon fiber reinforced resin-based hydrogen embrittlement-resistant reinforcement layer, and a high-hardness stainless steel wear-resistant protective layer. Each layer of the pipeline is formed by a hot pressing composite process, and the connection is sealed with a metal-resin transition joint.

4. The hydrogen combustion system for a steel rolling heating furnace according to claim 1, characterized in that: The hydrogen burner (8) adopts a four-stage premixing dynamic burner, which includes a first premixing section, a second premixing section, a third premixing section and a fourth premixing section connected in sequence, and each premixing section is provided with a hydrogen inlet and an air inlet; The first premixing section has a spiral guide vane on its inner wall, and its hydrogen inlet and air inlet are arranged at opposite tangents to form turbulent mixing. The second and third premixing sections both have built-in Venturi tubes, and their throats are equipped with atomizing nozzles to achieve gas-liquid shear mixing through the Venturi effect. The fourth premixing section has a smooth inner wall, and a flow stabilizer is provided at its outlet to ensure that the uniformity deviation of the mixed gas flow rate is within the budget range. The hydrogen inlet and the air inlet are both provided with electric regulating ball valves, and the opening of each ball valve is adjusted in stages according to the dynamic air-fuel ratio optimization algorithm so that the mixed gas in each premixing section has a concentration gradient distribution.

5. The hydrogen combustion system for a steel rolling heating furnace according to claim 4, characterized in that: The dynamic air-fuel ratio optimization algorithm includes: collecting burner operating parameters and building an air-fuel ratio prediction model based on an LSTM neural network, outputting the optimal air-fuel ratio through historical data training, and adjusting the opening of the hydrogen and air inlet ball valves in each premixing section according to the optimal air-fuel ratio to perform dynamic optimization of the air-fuel ratio.

6. The hydrogen combustion system for a steel rolling heating furnace according to claim 5, characterized in that: The operating parameters of the burner include hydrogen flow rate, air flow rate, combustion temperature and combustion efficiency; The air-fuel ratio prediction model is constructed, comprising: Based on the current burner operating parameters and control sequences , predict the air-fuel ratio: Among them, the control input is: , Operating parameters , A(t) Air flow ,F(t) is the hydrogen flow rate, T(t) is the combustion temperature.

7. The hydrogen combustion system for a steel rolling heating furnace according to claim 1, characterized in that: The multi-dimensional monitoring module in the furnace includes an online flame monitoring device (24) and an online temperature and pressure monitoring device (25). The online flame monitoring device (24) and the online temperature and pressure monitoring device (25) collect data through multiple sampling points (10) evenly arranged on the inner wall of the heating furnace (9) to monitor the temperature field distribution state in the furnace in real time, and cooperate with the online flue gas composition and temperature monitoring device (12) provided on the flue gas exhaust pipeline (11) to monitor the combustion efficiency of the heating furnace in real time and generate a combustion efficiency cloud map.

8. The hydrogen combustion system for a steel rolling heating furnace according to claim 1, characterized in that: The waste heat recovery and intelligent reversing module comprises a heat exchanger (13), wherein a flue gas heat exchange channel and an air heat exchange channel are provided in the heat exchanger (13), which are respectively used to recover the heat of flue gas discharged from the heating furnace (9) and to preheat the air entering the hydrogen burner (8). The inlet of the air heat exchange channel is connected to the air source, and the outlet of the air heat exchange channel is connected to the input end of the reversing regulating valve (26) through the induced draft fan (17), and the two output ends of the reversing regulating valve (26) are respectively connected to the air delivery pipeline and the air return pipeline; the air delivery pipeline is connected to the hydrogen burner (8), and the air return pipeline is connected to the inlet of the air heat exchange channel, and the air flow regulating valve (14) and the air flow regulating valve (2) (15) are respectively installed on the air return pipeline and the air delivery pipeline; The inlet of the flue gas heat exchange channel is connected to the flue gas exhaust pipeline (11) of the heating furnace (9), the outlet of the flue gas heat exchange channel is connected to the input end of the reversing regulating valve (27), and the two output ends of the reversing regulating valve (27) are respectively connected to the exhaust chimney and the flue gas return pipe; the flue gas return pipe is connected to the inlet of the flue gas heat exchange channel, and the flue gas return pipe is provided with an induced draft fan (18).

9. A method for controlling a hydrogen combustion system of a steel rolling heating furnace according to any one of claims 1 to 8, characterized in that: The steps include: S1, collects the flow, temperature, pressure and leakage data of the hydrogen transport pipeline in real time through the pipeline monitoring controller, and controls the opening of the hydrogen flow regulating valve to adjust the hydrogen flow input to the burner in real time; S2, based on the dynamic air-fuel ratio optimization algorithm, gradedly adjusts the opening of the hydrogen and air inlet ball valves of each premixing section of the fourth-stage premixed burner to perform dynamic optimization of the air-fuel ratio; S3, monitors the temperature distribution in the heating furnace in real time through the multi-dimensional monitoring module inside the furnace, and calculates the combustion efficiency of the heating furnace in real time by combining the flue gas composition and temperature online monitoring device on the flue gas exhaust pipeline; S4, by adjusting the reversing control valve 1 and reversing control valve 2 of the waste heat recovery and intelligent reversing module, performs intelligent reversing control of flue gas and air to improve the waste heat recovery efficiency.

10. The control method according to claim 9, characterized in that: The intelligent switching control of flue gas and air includes: 1) When the air temperature at the outlet of the air heat exchange channel is lower than the preset air temperature threshold, the opening ratio of one or two output ends of the reversing control valve is adjusted to return the preset proportion of air to the heat exchanger through the air return pipe for secondary preheating; 2) When the flue gas temperature at the outlet of the flue gas heat exchange channel is higher than the preset flue gas temperature threshold, the opening ratio of the two output ends of the reversing regulating valve 2 is adjusted to return the preset proportion of flue gas to the heat exchanger through the flue gas return pipe for secondary recovery of flue gas waste heat.

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