Hydrogen-doped natural gas combustion shuttle kiln and combustion control method

Abstract

The embodiment of the present application relates to the technical field of kiln combustion control, and discloses a shuttle kiln for natural gas hydrogen blending combustion and a combustion control method, the shuttle kiln for natural gas hydrogen blending combustion comprises a control system, a natural gas pipeline, a hydrogen pipeline, a blending pipeline, a fuel cut-off electromagnetic valve, an ignition controller, a burner, an auxiliary combustion air pipeline, an exhaust pipeline, a temperature detector and a kiln body, in the above manner, in terms of natural gas and hydrogen supply and mixing control, the strict cooperation of the ignition controller, the fuel cut-off electromagnetic valve and the burner is adopted, and a hydrogen-late control strategy is adopted, so that the two can be safely mixed and stably combusted; the control system controls the gas supply amount of the natural gas pipeline, the hydrogen pipeline and the auxiliary combustion air pipeline according to multi-dimensional real-time data and multi-dimensional dynamic firing parameter curves of the hearth, can intelligently, automatically and accurately control the hydrogen blending ratio, flow and auxiliary combustion air volume, and can accurately control the combustion temperature.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the technical field of kiln combustion control, in particular to a shuttle kiln for natural gas hydrogen blending combustion and a combustion control method. BACKGROUND

[0002] Natural gas is mainly composed of methane, which is an extremely flammable fuel. After combustion, a short and thick flame is quickly formed, and the high-temperature zone is concentrated in the front combustion zone. Adding hydrogen gas with faster combustion rate to natural gas will make the local high-temperature zone formed in the front of combustion continue to move forward, realizing efficient combustion of hydrogen-blended natural gas fuel.

[0003] At present, there are problems in the mixing control of hydrogen-blended natural gas fuel combustion in the shuttle kiln. The existing technology generally supplies natural gas and hydrogen gas in proportion through the adjustment of the valve. The supply and mixing control of hydrogen gas are not strict. Compared with natural gas, hydrogen gas is a more dangerous flammable gas due to its small molecules, fast diffusion speed and higher combustion heat. Therefore, slight improper control in hydrogen blending combustion can easily lead to safety problems such as hydrogen leakage and unstable combustion. In addition, the proportional supply of natural gas and hydrogen gas can easily lead to the problem of mismatching between combustion control and combustion temperature control for products with special requirements for temperature firing curve or different firing processes, making it difficult to accurately control the combustion temperature. Moreover, the existing technology only considers temperature control without comprehensively considering firing effects such as product firing quality, energy consumption and pollutant emission. SUMMARY

[0004] In view of the above problems, the embodiment of the present application provides a shuttle kiln for natural gas hydrogen blending combustion and a combustion control method to solve the above problems existing in the prior art.

[0005] According to one aspect of the embodiment of the present application, a shuttle kiln for natural gas hydrogen blending combustion is provided, which comprises a control system, a natural gas pipeline, a hydrogen gas pipeline, a blending pipeline, a fuel cut-off electromagnetic valve, an ignition controller, a burner, a combustion air pipeline, an exhaust gas pipeline, a temperature detector and a kiln body.

[0006] The natural gas pipeline is used to transport natural gas to the blending pipeline.

[0007] The hydrogen gas pipeline is used to transport hydrogen gas to the blending pipeline.

[0008] The blending pipeline is connected to the natural gas pipeline and the hydrogen gas pipeline, and is used to blend the hydrogen gas into the natural gas to obtain hydrogen-blended fuel gas.

[0009] The burner is connected to the blending pipeline, is arranged on the kiln body and has one end extending into the hearth of the kiln body, and is used to burn the hydrogen-blended fuel gas in the hearth.

[0010] The fuel cut-off electromagnetic valve is arranged between the burner and the mixing pipeline, the ignition controller is electrically connected with the burner and the fuel cut-off electromagnetic valve, is used for controlling the fuel cut-off electromagnetic valve to open according to the ignition instruction, controlling the burner to ignite according to the ignition instruction, and detecting the combustion flame, sending a feedback signal to the control system when the combustion flame is detected, and controlling the fuel cut-off electromagnetic valve to close when the combustion flame is not detected;

[0011] The output end of the combustion air pipeline is connected with the other end of the burner, and is used for conveying the combustion air into the burner.

[0012] The flue gas pipeline is connected with the kiln body, and is used for discharging flue gas for the kiln body.

[0013] The temperature detector is arranged on the kiln body and has one end extending into the hearth of the kiln body, and is used for detecting multi-dimensional real-time data of the hearth; the multi-dimensional real-time data of the hearth are data of the temperature detector, the flow meter, the pressure sensor and the flue gas analyzer received in real time.

[0014] The control system is electrically connected with the ignition controller, the temperature detector, the natural gas pipeline, the hydrogen pipeline and the combustion air pipeline, and is used for controlling the natural gas pipeline to supply gas, sending the ignition instruction to the ignition controller, controlling the hydrogen pipeline to supply gas after receiving the feedback signal of the ignition controller, and controlling the supply amount of the natural gas pipeline, the hydrogen pipeline and the combustion air pipeline according to the multi-dimensional real-time data of the hearth and the multi-dimensional dynamic firing parameter curve; the multi-dimensional dynamic firing parameter curve is a curve of temperature, hydrogen mixing ratio, combustion air amount and pressure value changing with time; the multi-dimensional dynamic firing parameter curve is a curve corresponding to the optimal firing effect after the machine learning algorithm is trained according to historical sintering data and corresponding historical firing effect; the historical sintering data are temperature, hydrogen mixing ratio, combustion air amount and pressure value collected in the firing process after each firing is completed; and the historical firing effect includes historical firing quality, historical energy consumption and historical pollutant emission.

[0015] In an optional manner, the mixing pipeline comprises a pipe body, two ends of the pipe body are connected with the output port of the natural gas pipeline and the fuel cut-off electromagnetic valve respectively, and the output end of the hydrogen pipeline extends into the pipe body from the side wall of the pipe body and is arranged in a bent manner, so that the output port of the hydrogen pipeline is opposite to the output port of the pipe body.

[0016] In an optional manner, the output port of the hydrogen pipeline is provided with a jet orifice plate, a plurality of through holes are arranged on the jet orifice plate, and the through holes are opposite to the output port of the pipe body.

[0017] In an alternative way, the pipe diameter of the pipe body is greater than the pipe diameter of the output port of the natural gas pipeline, and the pipe diameter of the output port of the hydrogen pipeline is less than the pipe diameter of the hydrogen pipeline.

[0018] In an alternative way, the natural gas pipeline is sequentially provided with a natural gas pressure reducing valve, a natural gas electromagnetic flow controller, and a natural gas check valve; the hydrogen pipeline is sequentially provided with a hydrogen pressure reducing valve, a hydrogen electromagnetic flow controller, a hydrogen electromagnetic cut-off valve, and a hydrogen check valve, the natural gas check valve and the hydrogen check valve are connected to the mixing pipeline; the combustion air pipeline is sequentially provided with a combustion air controller, a fan, and a combustion air electromagnetic regulating valve, the combustion air electromagnetic regulating valve is connected to the other end of the burner.

[0019] The control system is electrically connected to the natural gas electromagnetic flow controller, the hydrogen electromagnetic flow controller, the hydrogen electromagnetic cut-off valve, the combustion air controller, and the combustion air electromagnetic regulating valve.

[0020] In an alternative way, the control system further comprises:

[0021] The acquisition module is configured to acquire historical sintering data and corresponding historical firing effects, the historical sintering data including a multi-dimensional parameter setting curve and an actual value curve in a historical firing process, and key event point data.

[0022] The performance evaluation module is configured to determine a performance deviation, the performance deviation including a comprehensive deviation between an actual temperature curve and a target temperature curve, a unit product comprehensive energy consumption of the present firing, and a comparison result with a historical best value or a theoretical value.

[0023] The root cause analysis reasoning module is configured to perform correlation analysis on the performance deviation and operation parameters in the firing process, and perform analysis and reasoning by using a thermodynamic model, a heat transfer model, and a gradient boosting decision tree (GBDT) to obtain a root cause analysis result.

[0024] The curve updating module is configured to generate a fine-tuned parameter optimization strategy based on the root cause analysis result, and update a multi-dimensional dynamic firing parameter curve for the next firing according to the parameter optimization strategy.

[0025] In an alternative way, a manual ball valve is further arranged between the hydrogen electromagnetic cut-off valve and the hydrogen check valve.

[0026] According to another aspect of the embodiment of the present application, a combustion control method is provided, which is applied to the above-mentioned natural gas hydrogen-doped combustion shuttle kiln, and the combustion control method comprises:

[0027] After the combustion air pipeline and the exhaust gas pipeline are normally operated, the control system controls the natural gas pipeline to supply gas and sends an ignition instruction to the ignition controller;

[0028] The ignition controller controls the fuel cut-off electromagnetic valve to open according to the ignition instruction, controls the burner to ignite according to the ignition instruction, and detects the combustion flame, sends a feedback signal to the control system when the combustion flame is detected, and controls the fuel cut-off electromagnetic valve to close when the combustion flame is not detected;

[0029] After receiving the feedback signal, the control system controls the hydrogen pipeline to supply gas to mix natural gas and hydrogen in the mixing pipeline to obtain hydrogen-doped fuel gas, and controls the supply amount of the natural gas pipeline, the hydrogen pipeline and the combustion air pipeline according to the multi-dimensional real-time data of the hearth and the multi-dimensional dynamic firing parameter curve when the hydrogen-doped fuel gas is burned; wherein the multi-dimensional dynamic firing parameter curve is a curve of temperature, hydrogen mixing ratio, combustion air volume and pressure value changing with time; the multi-dimensional dynamic firing parameter curve is a curve corresponding to the optimal firing effect obtained by training the machine learning algorithm according to the historical sintering data and the corresponding historical firing effect; the historical sintering data is the temperature, hydrogen mixing ratio, combustion air volume and pressure value collected during the firing process after each firing is completed; the multi-dimensional real-time data of the hearth is the data of the temperature detector, flow meter, pressure sensor and flue gas analyzer received in real time, and the historical firing effect includes historical firing quality, historical energy consumption and historical pollutant emission.

[0030] In an optional manner, the control of the supply amount of the natural gas pipeline, the hydrogen pipeline and the combustion air pipeline according to the multi-dimensional real-time data of the hearth and the multi-dimensional dynamic firing parameter curve comprises:

[0031] Comparing the current temperature, current hydrogen mixing ratio, current combustion air volume and current pressure value of the hearth with the corresponding parameters of the multi-dimensional dynamic firing parameter curve respectively;

[0032] Adjusting the current temperature, current hydrogen mixing ratio, current combustion air volume and current pressure value according to the difference of the parameters respectively.

[0033] In an optional manner, the control of the supply amount of the natural gas pipeline, the hydrogen pipeline and the combustion air pipeline according to the multi-dimensional real-time data of the hearth and the multi-dimensional dynamic firing parameter curve further comprises:

[0034] When the shuttle kiln is shut down, the control system controls the hydrogen pipeline to gradually reduce the hydrogen flow to the first minimum value, then controls the hydrogen pipeline to stop supplying gas until the hydrogen flow in the hydrogen pipeline is zero, delays for the preset time, and then controls the natural gas pipeline to reduce the natural gas flow until the natural gas flow is zero.

[0035] In an alternative way, when the control system controls the supply amounts of the natural gas pipeline and the hydrogen pipeline respectively, the control system also controls the hydrogen pressure to be greater than the natural gas pressure, so that the hydrogen flowing out of the hydrogen pipeline entrains and absorbs the natural gas flowing out of the natural gas pipeline.

[0036] According to still another aspect of the embodiments of the present application, a computer readable storage medium is provided, and the storage medium stores at least one executable instruction, and the executable instruction, when executed on a computer device, causes the computer device to perform the method as described above.

[0037] In the embodiments of the present application, the natural gas and the hydrogen are respectively transported to the mixing pipeline through separate pipelines. First, the control system controls the ignition controller, the ignition controller controls the fuel cut-off electromagnetic valve to open, so that the natural gas is transported to the mixing pipeline, the ignition controller controls the burner to ignite and detect the combustion flame, and when the combustion flame is detected, a feedback signal is sent to the control system. The control system controls the hydrogen pipeline to supply gas according to the feedback signal, so that the hydrogen is mixed into the natural gas in the mixing pipeline, and finally the hydrogen-mixed fuel gas is burned in the burner. In the embodiments of the present application, in the aspects of natural gas and hydrogen supply and mixing control, the ignition controller, the fuel cut-off electromagnetic valve and the burner are strictly matched, and the hydrogen is controlled to enter backward, that is, the natural gas enters first, and the hydrogen enters after the natural gas is burned, so that the two can be safely mixed and stably burned. The control system controls the supply amounts of the natural gas pipeline, the hydrogen pipeline and the combustion air pipeline according to the multi-dimensional real-time data of the hearth and the multi-dimensional dynamic firing parameter curve, so that the hydrogen mixing ratio, the flow and the combustion air amount can be intelligently, automatically and accurately controlled, the temperature requirements of different firing processes can be met, the combustion control and the temperature control can be matched, the combustion temperature can be accurately controlled, the stability of the firing process can be improved, the firing quality of the product can be optimized, and the human operation risk is reduced.

[0038] The above description is only a summary of the technical solutions of the embodiments of the present application, in order to more clearly understand the technical means of the embodiments of the present application, the embodiments of the present application can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the embodiments of the present application more obvious and easy to understand, the specific embodiments of the present application are described below. BRIEF DESCRIPTION OF DRAWINGS

[0039] The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification. In the drawings:

[0040] Figure 1 Fig. 1 shows a structure schematic diagram of a shuttle kiln provided by the embodiment of the application in one angle of natural gas hydrogen blending combustion;

[0041] Figure 2 Fig. 2 shows a structure schematic diagram of a shuttle kiln provided by the embodiment of the application in another angle of natural gas hydrogen blending combustion;

[0042] Figure 3 Fig. 3 shows a cross-section structure schematic diagram of a mixing pipeline in a shuttle kiln provided by the embodiment of the application in natural gas hydrogen blending combustion;

[0043] Figure 4 Fig. 4 shows a right view of the shuttle kiln provided by the embodiment of the application; Figure 3

[0044] Figure 5 Fig. 5 shows a flow schematic diagram of a combustion control method provided by the embodiment of the application.

[0045] The reference signs in the detailed description are as follows:

[0046] Control system 1, natural gas pipeline 2, hydrogen pipeline 3, mixing pipeline 4, fuel cut-off electromagnetic valve 5, ignition controller 6, burner 7, combustion air pipeline 8, exhaust pipeline 9, temperature detector 10, kiln body 11, natural gas pressure reducing valve 21, natural gas electromagnetic flow controller 22, natural gas check valve 23, hydrogen pressure reducing valve 31, hydrogen electromagnetic flow controller 32, hydrogen electromagnetic cut-off valve 33, hydrogen check valve 34, manual ball valve 35, combustion air controller 81, fan 82, combustion air electromagnetic regulating valve 83, pipe body 41, jet orifice plate 36, through hole 361, exhaust induced draft fan 91, chimney 92. DETAILED DESCRIPTION

[0047] Exemplary embodiments of the present application will be described herein below with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it is understood that the present application can be embodied in various forms and should not be limited by the embodiments set forth herein.

[0048] Figure 1 Fig. 1 shows a structure schematic diagram of a shuttle kiln provided by the embodiment of the application in one angle of natural gas hydrogen blending combustion; Figure 2 Fig. 2 shows a structure schematic diagram of a shuttle kiln provided by the embodiment of the application in another angle of natural gas hydrogen blending combustion; Figure 1 Fig. 3 shows a cross-section structure schematic diagram of a mixing pipeline in a shuttle kiln provided by the embodiment of the application in natural gas hydrogen blending combustion; Figure 2 ​As shown, the shuttle kiln for natural gas hydrogen combustion includes a control system 1, a natural gas pipeline 2, a hydrogen pipeline 3, a mixing pipeline 4, a fuel cut-off electromagnetic valve 5, an ignition controller 6, a burner 7, an air pipeline 8, an exhaust pipeline 9, a temperature detector 10, and a kiln body 11. The kiln body 11 is composed of an external steel structure frame and an internal heat preservation layer. The hearth of the kiln body 11 is used for gas combustion and is used for firing various industrial materials or ceramic products. As an example, the shuttle kiln is used for firing ceramic products. As shown, the hearth has a trolley for loading ceramic products. The kiln body 11 is provided with a movable furnace door. The kiln body 11 is provided with a rotating shaft. The movable furnace door is connected to the rotating shaft through the rotating shaft, so as to facilitate opening the movable furnace door and pushing the trolley with ceramic products into or out of the kiln.

[0049] The natural gas pipeline 2 is used for separately conveying natural gas to the mixing pipeline 4. The hydrogen pipeline 3 is used for separately conveying hydrogen to the mixing pipeline 4. The mixing pipeline 4 is connected to the natural gas pipeline 2 and the hydrogen pipeline 3 and is used for mixing hydrogen into natural gas to obtain hydrogen-containing combustion gas. Hydrogen has a combustion-supporting effect when natural gas is burned. The mixing pipeline 4 of the present embodiment can realize safe mixing of natural gas and hydrogen.

[0050] The burner 7 is connected to the mixing pipeline 4. The burner 7 is arranged on the kiln body 11 and has one end extending into the hearth of the kiln body 11, so that the hydrogen-containing combustion gas can be burned in the hearth. In order to improve safety, the fuel cut-off electromagnetic valve 5 is further arranged between the burner 7 and the mixing pipeline 4. The ignition controller 6 is electrically connected to the burner 7 and the fuel cut-off electromagnetic valve 5. The ignition controller 6 has the functions of controlling ignition, monitoring flame condition, and controlling the on-off of the fuel cut-off electromagnetic valve 5. After the ignition instruction is issued by the control system 1, the ignition controller 6 controls the fuel cut-off electromagnetic valve 5 to open, so that the natural gas in the mixing pipeline 4 flows into the burner 7. The ignition controller 6 also controls the burner 7 to ignite according to the ignition instruction. The ignition controller 6 connects the current of the ignition electrode of the burner 7 to ignite. Under the action of the ignition electrode, the natural gas is ignited, and the combustion flame of the natural gas appears in the burner 7. The ignition controller 6 also detects the combustion flame to determine whether the combustion flame exists or the combustion flame is extinguished. When the combustion flame is detected, a feedback signal is sent to the control system 1, so that the control system 1 controls the hydrogen pipeline 3 to supply hydrogen, and the hydrogen is mixed into the natural gas in the mixing pipeline 4. When the ignition controller 6 does not detect the combustion flame, the fuel cut-off electromagnetic valve 5 is controlled to be closed to prevent gas leakage. The ignition controller 6 and the fuel cut-off electromagnetic valve 5 are important safety control devices of the present embodiment. The ignition controller 6 integrates three functions. After being matched with the fuel cut-off electromagnetic valve 5 and the burner 7, the ignition controller 6 can improve the safety and stability of the combustion process.

[0051] The output end of the combustion-supporting air pipeline 8 is connected to the other end of the burner 7, for conveying combustion-supporting air into the burner 7, and the combustion-supporting air pipeline 8 can use a fan to directly convey air flow into the burner 7 for combustion-supporting. The smoke exhaust pipeline 9 is connected to the kiln body 11, for exhausting smoke for the kiln body 11, and the smoke exhaust pipeline 9 can include a smoke exhaust induced draft fan 91 and a chimney 92, through which the smoke generated by combustion is exhausted to the chimney 92 and finally exhausted to the outside through the chimney 92.

[0052] The temperature detector 10 is arranged on the kiln body 11 and has one end extending into the hearth of the kiln body 11, for detecting multi-dimensional real-time data of the hearth, wherein the temperature detector 10 can be a thermocouple which converts a temperature signal into an electric signal and sends it to the control system 1. The hearth and the corresponding positions of the natural gas pipeline 2, the hydrogen pipeline 3 and the combustion-supporting air pipeline 2 are also respectively provided with one or more flow meters, pressure sensors and smoke analyzers (not shown in the figure) for respectively detecting the flow, pressure value and smoke substance content at each position in real time.

[0053] The control system 1 of the present embodiment is electrically connected to the ignition controller 6, the temperature detector 10, the natural gas pipeline 2, the hydrogen pipeline 3 and the combustion-supporting air pipeline 8, and is used to control the natural gas pipeline 2 to supply gas. After the natural gas pipeline 2 supplies gas, the control system 1 issues an ignition instruction to the ignition controller 6, and when a feedback signal from the ignition controller 6 is received, it indicates that ignition is successful. The control system 1 controls the hydrogen pipeline 3 to supply gas, so that hydrogen is mixed into natural gas in the mixing pipeline 4, and finally the hydrogen-mixed fuel gas is burned in the burner 7. In the present embodiment, natural gas is burned before hydrogen, and after natural gas is burned, hydrogen is mixed into natural gas for combustion. This way can improve the safety of hydrogen mixed combustion. In addition, when natural gas is mixed with hydrogen for combustion, hydrogen acts as a combustion-supporting gas, which can help natural gas to burn more completely, improve the overall energy efficiency of the fuel, and reduce energy consumption and energy waste.

[0054] The control system 1 also controls the gas supply amount of the natural gas pipeline 2, the hydrogen pipeline 3 and the combustion air pipeline 8 according to the multi-dimensional real-time data of the furnace and the multi-dimensional dynamic firing parameter curve. The multi-dimensional dynamic firing parameter curve is a curve of temperature, hydrogen mixing ratio, combustion air volume and pressure value changing with time. The multi-dimensional dynamic firing parameter curve is a curve corresponding to the optimal firing effect obtained by training the machine learning algorithm according to historical sintering data and corresponding historical firing effect. The historical sintering data is the temperature, hydrogen mixing ratio, combustion air volume and pressure value collected during the firing process after each firing is completed. The multi-dimensional real-time data of the furnace is the data of the temperature detector, flow meter, pressure sensor and flue gas analyzer received in real time. The historical firing effect includes historical firing quality, historical energy consumption and historical pollutant emission. The control system 1 of the embodiment controls the gas supply amount of the natural gas pipeline 2, the hydrogen pipeline 3 and the combustion air pipeline 8. Whether it is high-temperature firing or a product with special requirements for the multi-dimensional dynamic firing parameter curve, the control system 1 can automatically and accurately control the temperature, hydrogen mixing ratio and other parameters according to the multi-dimensional parameter changes required by different firing processes, so as to achieve optimal firing quality, optimal energy consumption and optimal pollutant emission, solve the problem of inaccurate firing control and temperature control of the shuttle kiln and not comprehensively considering the firing effect such as product firing quality, energy consumption and pollutant emission, and thus optimize the firing quality of the product and improve the consistency and yield of the product.

[0055] The machine learning algorithm module built in the control system 1 has a self-optimization process which is a rigorous, data-driven closed-loop feedback control cycle. This process not only performs real-time fine tuning in a single firing, but more importantly, after each firing is completed, it performs deep data analysis and optimizes the initial parameter settings for the next firing. Specifically, the control system 1 performs the following operations:

[0056] First step: multi-dimensional data acquisition and storage.

[0057] Wherein, in the present firing process (denoted as the Nth firing), the system synchronously collects and time-stamps aligns the following data streams at a high frequency (e.g. once per second) to form a complete set of “firing history” data. First, set the value curve, the temperature target value T_target(t) changing with time, the hydrogen blending ratio set value H2%_target(t), the combustion air volume set value Air_target(t). Then determine the actual value curve, record the actual furnace temperature T_actual(t) fed back by the temperature detector (10), the actual natural gas flow Gas_actual(t) fed back by the natural gas electromagnetic flow controller (22), the actual hydrogen flow H2_actual(t) fed back by the hydrogen electromagnetic flow controller (32), and the actual air volume Air_actual(t) fed back by the combustion air controller (81) in real time. Wherein, the embodiment of the present application also records the data of key event points, including the ignition success time, the switching time of each heating stage, the time when the peak temperature is reached, and the time when the cooling starts. Finally, determine the result index, that is, the index recorded after the firing is completed or calculated by the system, including the total natural gas consumption, the total hydrogen consumption, and the product firing quality detection result of the present firing. Wherein, the product firing quality detection result includes the rate of superior products, whether it cracks, deformation degree, etc. This data can be input into the system by the operator according to the inspection result after the furnace is discharged.

[0058] Second step: performance evaluation and deviation calculation

[0059] After the firing is completed, the machine learning algorithm starts the analysis program: performs temperature tracking deviation analysis, calculates the comprehensive deviation between the actual temperature curve and the target temperature curve in the entire firing process. This not only includes the simple mean absolute error (MAE), but also focuses on analyzing the maximum deviation, overshoot and stable time in the key process window (such as the crystal transformation temperature interval). For example, the system can identify that in the “600-800℃ oxidation stage”, the actual temperature rises too fast and exceeds the allowable fluctuation range of the curve. Perform energy efficiency analysis, calculate the comprehensive energy consumption per unit product of the present firing ((total natural gas heat value + total hydrogen heat value) / product yield), and compare it with the historical best value or theoretical value. Perform blending uniformity and stability analysis, including analyzing the hydrogen flow fluctuation, and evaluating the stability of the blending process.

[0060] Third step: root cause analysis and large model reasoning.

[0061] The system analyzes the performance deviation and the operation parameters in the firing process by algorithm, and uses the built-in process model and the trained machine learning model for reasoning. The process model includes thermodynamic model and heat transfer model, and the machine model can be gradient boosting decision tree (GBDT) or long short-term memory network (LSTM). The reasoning process includes: 1. Identifying problems, such as analyzing that the rapid temperature rise in the 600-800℃ stage is caused by the excessive rising slope of natural gas flow at the beginning of the stage and the lagging matching of combustion air volume. 2. Finding optimization points, such as in the 1250℃ holding stage, if the hydrogen mixing ratio is maintained at 32%, the oxygen content in the flue gas is high, indicating that the combustion air volume is excessive, resulting in heat loss. Through model reasoning, it is suggested that the mixing ratio can be increased to 33% in this stage, and the combustion air volume can be reduced at the same time, to improve the thermal efficiency under the premise of sufficient combustion. 3. Learning from successful experience: the temperature control in the reduction stage is very stable, and the algorithm records the successful cooperation parameters (such as flow rate, proportion relationship) of natural gas, hydrogen and combustion air in this stage, and strengthens them as an effective rule.

[0062] Fourth step: generating optimization strategy and updating firing curve

[0063] In the embodiment of the present application, based on the root cause analysis result, the algorithm generates a set of targeted and fine-tuned parameter optimization strategies for updating the "multi-dimensional firing curve" of the next (N+1) firing. The multi-dimensional firing curve is updated. The parameters are adjusted to generate new control instructions, such as for the above-mentioned rapid temperature rise stage, the algorithm automatically generates new control instructions to reduce the natural gas flow rising slope at the beginning of the 600-800℃ stage by 10%, and to increase the combustion air volume setting value by 5 seconds in advance to improve the air-fuel ratio. The curve is updated: these optimized parameters (such as new flow rate, new proportion setting value) are seamlessly integrated into the preset curve of the next firing. Therefore, the curve used in the N+1 firing is an intelligent and fine-tuned version of the N curve, rather than a fixed version.

[0064] Fifth step: safety boundary verification and manual confirmation

[0065] Before applying the new multi-dimensional firing curve, the system automatically verifies the optimized parameters with the built-in dynamic safety boundary library to ensure that all adjustments are within the absolute safety range, such as the hydrogen mixing ratio will not exceed the safety upper limit at the current temperature. Subsequently, the optimized curve and suggestions are presented to the operator through the HMI interface, and the operator has the final confirmation right, which can choose to apply immediately, not to apply temporarily or to apply manually after fine-tuning. This "man-machine cooperation" mode ensures the safety and reliability of automation.

[0066] In the embodiment of the present application, the above process is repeated. Each firing provides new and high-quality data for the machine learning model, enabling it to better understand the thermal characteristics of the kiln, fuel reaction, and product process, thereby making increasingly accurate predictions and optimizations, and ultimately achieving continuous self-optimization of the firing process, approaching the "golden process" point of optimal firing quality, minimum energy consumption, and minimum pollutant emissions.

[0067] It is worth noting that the natural gas pipeline 2, hydrogen pipeline 3, mixing pipeline 4, and combustion air pipeline 8 can be divided into multiple branches, and the corresponding fuel shut-off electromagnetic valve 5, ignition controller 6, and burner 7 are arranged on each branch, as shown in Figure 1 The shuttle kiln is provided with four branches, and the four burners 7 are evenly distributed in the furnace chamber, which can quickly reach the predetermined temperature and ensure the stability of the temperature.

[0068] In this embodiment, natural gas and hydrogen are delivered through separate pipelines to the mixing pipeline 4. First, the ignition controller 6 is controlled by the control system 1, the fuel shut-off electromagnetic valve 5 is opened by the ignition controller 6, and the natural gas is delivered to the mixing pipeline 4. The burner 7 is ignited and the combustion flame is detected by the ignition controller 6. When the combustion flame is detected, a feedback signal is sent to the control system 1. The control system 1 controls the hydrogen pipeline 3 to supply gas based on the feedback signal, so that hydrogen is mixed with natural gas in the mixing pipeline 4. Finally, the hydrogen-containing fuel gas is burned in the burner 7. In this embodiment, the strict cooperation of the ignition controller 6, fuel shut-off electromagnetic valve 5, and burner 7, as well as the control strategy of hydrogen entering last, i.e., natural gas entering first and hydrogen entering after natural gas burning, enable safe mixing and stable combustion of the two. The control system 1 controls the gas supply of the natural gas pipeline 2, hydrogen pipeline 3, and combustion air pipeline 8 based on multi-dimensional real-time data and multi-dimensional dynamic firing parameter curves, intelligently, automatically, and accurately controls the hydrogen mixing ratio, flow rate, and combustion air volume, meets the temperature requirements of different firing processes, matches the combustion control and temperature control, accurately controls the combustion temperature, improves the stability of the firing process, optimizes the firing quality of the product, and reduces the risk of human operation.

[0069] Further, as shown in Figure 3 and Figure 4 The mixing pipeline 4 includes a pipe body 41, the output port of the natural gas pipeline 2 and the fuel shut-off electromagnetic valve 5 are connected to the two ends of the pipe body 41, the output end of the hydrogen pipeline 3 extends into the pipe body 41 from the side wall of the pipe body 41 and is bent to make the output port of the hydrogen pipeline 3 face the output port of the pipe body 41.

[0070] The natural gas is transported from the output port of the natural gas pipeline 2 to the pipe body 41 and flows out from the output port of the pipe body 41, the hydrogen gas flows into the pipe body 41 from the side wall of the pipe body 41 through the hydrogen gas pipeline 3 and directly flows to the output port of the pipe body 41 after entering the pipe body 41, in this way of separate supply, the natural gas mixed with the hydrogen gas near the output port of the pipe body 41, so that the natural gas cannot flow back to the hydrogen gas pipeline 3 and the hydrogen gas cannot flow back to the natural gas pipeline 2, and the two can be well mixed, and after mixing, it is sent into the burner 7 for combustion, which can improve the safety of gas mixing. Preferably, pressure gauges are arranged between the natural gas pressure reducing valve 21 and the natural gas electromagnetic flow controller 22, and between the hydrogen gas pressure reducing valve 31 and the hydrogen gas electromagnetic flow controller 32, the pressure gauges are used to detect the gas flow pressure, and the pressure gauges are electrically connected with the control system 1, the control system 1 controls the natural gas flow pressure and the hydrogen gas flow pressure, so that the hydrogen gas flow speed is higher than the natural gas flow speed and the gas pressure is larger, when the hydrogen gas flow flows out from the output port of the hydrogen gas pipeline 3, it can induce and suck the natural gas, which can further improve the safety of gas mixing.

[0071] Further, the output port of the hydrogen gas pipeline 3 is provided with a jet multi-hole plate 36, the jet multi-hole plate 36 is provided with a plurality of through holes 361, as shown in the figure, the through holes 361 are opposite to the output port of the pipe body 41. When the hydrogen gas flow flows to the output port of the hydrogen gas pipeline 3, it flows out through the through holes 361 of the jet multi-hole plate 36, the hydrogen gas flow flowing out through the through holes 361 can be better mixed with the natural gas, the gas mixing is more uniform, the combustion is more sufficient, and the problem of unstable combustion is avoided. Figure 4

[0072] Further, as shown in the figure, the pipe diameter of the pipe body 41 is larger than the pipe diameter of the output port of the natural gas pipeline 2, the space of the pipe body 41 is larger, so that a large space is filled with a large amount of natural gas, the pipe diameter of the output port of the hydrogen gas pipeline 3 is smaller than the pipe diameter of the hydrogen gas pipeline 3, which is conducive to the formation of high-pressure and high-speed hydrogen gas flow and the mixing with a large amount of natural gas in the pipe body 41, further improving the uniformity of gas mixing. Figure 3

[0073] Further, the natural gas pipeline 2 is sequentially provided with a natural gas pressure reducing valve 21, a natural gas electromagnetic flow controller 22, a natural gas check valve 23; the hydrogen gas pipeline 3 is sequentially provided with a hydrogen gas pressure reducing valve 31, a hydrogen gas electromagnetic flow controller 32, a hydrogen gas electromagnetic cut-off valve 33 and a hydrogen gas check valve 34, the natural gas check valve 23 and the hydrogen gas check valve 34 are respectively connected with the mixing pipeline 4; the combustion air pipeline 8 is sequentially provided with a combustion air controller 81, a fan 82 and a combustion air electromagnetic regulating valve 83, the combustion air electromagnetic regulating valve 83 is connected with the other end of the burner 7; the control system 1 is electrically connected with the natural gas electromagnetic flow controller 22, the hydrogen gas electromagnetic flow controller 32, the hydrogen gas electromagnetic cut-off valve 33, the combustion air controller 81 and the combustion air electromagnetic regulating valve 83. ​​

[0074] The natural gas in the natural gas pipeline 2 flows to the mixing pipeline 4 through the natural gas pressure reducing valve 21, the natural gas electromagnetic flow controller 22 and the natural gas check valve 23. The hydrogen gas in the hydrogen gas pipeline 3 flows to the mixing pipeline 4 through the hydrogen gas pressure reducing valve 31, the hydrogen gas electromagnetic flow controller 32, the hydrogen gas electromagnetic cut-off valve 33 and the hydrogen gas check valve 34. In order to improve safety, the hydrogen gas pipeline 3 is further provided with the controllable hydrogen gas electromagnetic cut-off valve 33, which can be used to cut off the hydrogen gas supply in abnormal conditions. The combustion air pipeline 8 is sequentially provided with the combustion air controller 81, the fan 82 and the combustion air electromagnetic regulating valve 83, wherein the combustion air controller 81 can be a frequency conversion controller. The control system 1 can control the flow of the natural gas by controlling the natural gas electromagnetic flow controller 22. The control system 1 realizes double safety control of the hydrogen gas by controlling the hydrogen gas electromagnetic flow controller 32 and the hydrogen gas electromagnetic cut-off valve 33, wherein the flow of the hydrogen gas can be controlled by the hydrogen gas electromagnetic flow controller 32, and the hydrogen gas pipeline 3 can be controlled by the hydrogen gas electromagnetic cut-off valve 33. The control system 1 realizes double safety control of the combustion air by controlling the combustion air controller 81 and the combustion air electromagnetic regulating valve 83, wherein the air volume and the air speed generated by the fan 82 can be controlled, and the air volume entering the burner 7 can be controlled by controlling the combustion air electromagnetic regulating valve 83.

[0075] The natural gas in the natural gas pipeline 2 flows to the mixing pipeline 4 through the natural gas pressure reducing valve 21, the natural gas electromagnetic flow controller 22 and the natural gas check valve 23. The hydrogen gas in the hydrogen gas pipeline 3 flows to the mixing pipeline 4 through the hydrogen gas pressure reducing valve 31, the hydrogen gas electromagnetic flow controller 32, the hydrogen gas electromagnetic cut-off valve 33 and the hydrogen gas check valve 34. In order to improve safety, the hydrogen gas pipeline 3 is further provided with the controllable hydrogen gas electromagnetic cut-off valve 33, which can be used to cut off the hydrogen gas supply in abnormal conditions. The combustion air pipeline 8 is sequentially provided with the combustion air controller 81, the fan 82 and the combustion air electromagnetic regulating valve 83, wherein the combustion air controller 81 can be a frequency conversion controller. The control system 1 can control the flow of the natural gas by controlling the natural gas electromagnetic flow controller 22. The control system 1 realizes double safety control of the hydrogen gas by controlling the hydrogen gas electromagnetic flow controller 32 and the hydrogen gas electromagnetic cut-off valve 33, wherein the flow of the hydrogen gas can be controlled by the hydrogen gas electromagnetic flow controller 32, and the hydrogen gas pipeline 3 can be controlled by the hydrogen gas electromagnetic cut-off valve 33. The control system 1 realizes double safety control of the combustion air by controlling the combustion air controller 81 and the combustion air electromagnetic regulating valve 83, wherein the air volume and the air speed generated by the fan 82 can be controlled, and the air volume entering the burner 7 can be controlled by controlling the combustion air electromagnetic regulating valve 83.

[0076] Further, the manual ball valve 35 is further arranged between the hydrogen gas electromagnetic cut-off valve 33 and the hydrogen gas check valve 34, and the manual ball valve 35 is manually opened or closed. When the hydrogen gas electromagnetic flow controller 32 and / or the hydrogen gas electromagnetic cut-off valve 33 fails, the hydrogen gas can be cut off by further arranging the manual ball valve 35 considering the danger of the hydrogen gas. The safety device design of the manual ball valve 35 can further improve safety.

[0077] Figure 5 The flow chart of the combustion control method of the shuttle kiln applied to the natural gas hydrogen blending combustion is shown in the embodiment of the present application, as shown in Figure 5As shown, the method comprises the following steps:

[0078] S100, after the combustion air pipeline and the exhaust pipeline are normally operated, the control system controls the natural gas pipeline to supply gas and issues an ignition instruction to the ignition controller;

[0079] After the shuttle kiln is started, first, the combustion air pipeline and the exhaust pipeline are opened, and the normal operation of the air and smoke system in the furnace is maintained. Then, the control system issues a command to the combustion air pipeline, for example, by issuing a command to the combustion air electromagnetic regulating valve and the combustion air frequency converter controller to adjust the parameters of the combustion air. After that, the control system controls the natural gas pipeline to supply gas, for example, by issuing an opening command to the natural gas electromagnetic flow controller to make the natural gas pipeline supply gas, and the natural gas flows to the mixing pipeline. After the natural gas is supplied, the control system issues an ignition command to the ignition controller to ignite.

[0080] S200, the ignition controller controls the fuel cut-off electromagnetic valve to open according to the ignition instruction, controls the burner to ignite according to the ignition instruction, and detects the combustion flame, and sends a feedback signal to the control system when the combustion flame is detected, and controls the fuel cut-off electromagnetic valve to close when the combustion flame is not detected;

[0081] After the ignition controller receives the ignition instruction, the fuel cut-off electromagnetic valve is controlled to open according to the ignition instruction, and the natural gas in the natural gas pipeline continues to flow to the burner from the mixing pipeline. Then, the burner is ignited according to the ignition instruction, and the natural gas and the combustion air are mixed in the burner. Under the action of the ignition electrode, the natural gas is ignited, and the combustion flame of the natural gas appears in the burner. The ignition controller detects the combustion flame, and sends a feedback signal to the control system when the combustion flame is detected, so as to control the hydrogen pipeline to supply gas, for example, by issuing an opening command to the hydrogen electromagnetic flow controller and the hydrogen electromagnetic cut-off valve to make the hydrogen pipeline supply gas. If the combustion flame is not detected, it is in the state of extinguishing, and the fuel cut-off electromagnetic valve is controlled to close to prevent gas leakage.

[0082] In addition, after the hydrogen is mixed into the natural gas, the ignition controller also detects in real time whether there is a combustion flame, and immediately controls the fuel cut-off electromagnetic valve to close once it is found that there is no combustion flame.

[0083] S300, after receiving the feedback signal, the control system controls the hydrogen pipeline to supply gas to mix hydrogen and natural gas in the mixing pipeline to obtain hydrogen-mixed fuel gas. When the hydrogen-mixed fuel gas is burned, the supply amount of the natural gas pipeline, the hydrogen pipeline and the combustion air pipeline is controlled according to the multi-dimensional real-time data of the hearth and the multi-dimensional dynamic firing parameter curve. The specific process of the control system for detecting the multi-dimensional real-time data of the hearth and generating the multi-dimensional dynamic firing parameter curve is basically the same as that of the foregoing embodiments, which will not be described here.

[0084] The control system controls the hydrogen pipeline to supply gas after receiving the feedback signal of the ignition controller, wherein the control system controls the hydrogen gas flow pressure to be greater than the natural gas flow pressure, so that the high-pressure high-speed hydrogen gas flow flows to the mixing pipeline and entrains and sucks the natural gas, realizes mixing with the natural gas, obtains hydrogen-doped fuel gas, and the hydrogen-doped fuel gas is burned in the burner. The natural gas of the embodiment is burned before the hydrogen, which can improve the safety of hydrogen mixed combustion.

[0085] When the hydrogen-doped fuel gas is burned, the temperature detector detects the multi-dimensional real-time data of the furnace, and converts the temperature signal into an electric signal and sends it to the control system. The control system also controls the gas supply amount of the natural gas pipeline, the hydrogen pipeline and the combustion air pipeline according to the multi-dimensional real-time data of the furnace and the multi-dimensional dynamic firing parameter curve, to realize intelligent, automatic and accurate control of the hydrogen mixing ratio, flow and combustion air volume.

[0086] Specifically, the control system controls the hydrogen pipeline to supply gas after receiving the feedback signal to mix natural gas and hydrogen in the mixing pipeline to obtain hydrogen-doped fuel gas, and controls the gas supply amount of the natural gas pipeline, the hydrogen pipeline and the combustion air pipeline according to the multi-dimensional real-time data of the furnace and the multi-dimensional dynamic firing parameter curve when the hydrogen-doped fuel gas is burned; wherein the multi-dimensional dynamic firing parameter curve is a curve of temperature, hydrogen mixing ratio, combustion air volume and pressure value parameters changing with time; the multi-dimensional dynamic firing parameter curve is a curve corresponding to the optimal firing effect obtained by training the machine learning algorithm according to the historical sintering data and the corresponding historical firing effect; the historical sintering data is the temperature, hydrogen mixing ratio, combustion air volume and pressure value collected during the firing process after each firing is completed; the multi-dimensional real-time data of the furnace is the data of the temperature detector, flow meter, pressure sensor and flue gas analyzer received in real time; and the historical firing effect includes historical firing quality, historical energy consumption and historical pollutant emission. Wherein, the current temperature, current hydrogen mixing ratio, current combustion air volume and current pressure value of the furnace are compared with the corresponding parameters of the multi-dimensional dynamic firing parameter curve; and the current temperature, current hydrogen mixing ratio, current combustion air volume and current pressure value are adjusted according to the difference between the parameters.

[0087] Further, the above-mentioned control of the gas supply amount of the natural gas pipeline, the hydrogen pipeline and the combustion air pipeline according to the multi-dimensional real-time data of the furnace and the multi-dimensional dynamic firing parameter curve comprises:

[0088] comparing the multi-dimensional real-time data of the furnace with the corresponding temperature of the multi-dimensional dynamic firing parameter curve;

[0089] When the multi-dimensional real-time data of the furnace is greater than the temperature corresponding to the multi-dimensional dynamic firing parameter curve, the hydrogen pipeline is controlled to reduce the hydrogen flow to a preset first minimum value according to the preset hydrogen mixing ratio, and after a preset time delay, the natural gas pipeline and the combustion air pipeline are controlled to reduce the natural gas flow and the combustion air flow to a preset second minimum value, until the multi-dimensional real-time data of the furnace is equal to the temperature corresponding to the multi-dimensional dynamic firing parameter curve.

[0090] When the multi-dimensional real-time data of the furnace is less than the temperature corresponding to the multi-dimensional dynamic firing parameter curve, the natural gas pipeline and the combustion air pipeline are controlled to increase the natural gas flow and the combustion air flow to a preset first maximum value, and after a preset time delay, the hydrogen pipeline is controlled to increase the hydrogen flow to a preset second maximum value according to the preset hydrogen mixing ratio, until the multi-dimensional real-time data of the furnace is equal to the parameter in the multi-dimensional dynamic firing parameter curve.

[0091] For example, for temperature adjustment, the parameter value is adjusted according to the multi-dimensional real-time data of the furnace, such as when the temperature is low, an instruction is sent to the hydrogen electromagnetic flow controller to adjust the hydrogen electromagnetic flow controller so that the hydrogen flow is reduced, the hydrogen pipeline reduces the hydrogen flow to a preset first minimum value according to the preset hydrogen mixing ratio, and after a preset time delay, for example, a delay of 0.5-1 seconds, an instruction is sent to the natural gas electromagnetic flow controller and the combustion air controller to adjust the natural gas electromagnetic flow controller and the combustion air controller so that the natural gas flow and the combustion air are both reduced, until the multi-dimensional real-time data of the furnace is equal to the temperature corresponding to the multi-dimensional dynamic firing parameter curve.

[0092] Conversely, when the temperature in the multi-dimensional real-time data of the furnace is less than the temperature corresponding to the multi-dimensional dynamic firing parameter curve, first, an instruction is sent to the natural gas electromagnetic flow controller and the combustion air controller to adjust the natural gas electromagnetic flow controller and the combustion air controller so that the natural gas flow and the combustion air are both increased to a preset first maximum value, and after a preset time delay, for example, a delay of 0.5-1 seconds, an instruction is sent to the hydrogen electromagnetic flow controller to adjust the hydrogen electromagnetic flow controller so that the hydrogen flow is increased, and the hydrogen pipeline increases the hydrogen flow to a preset second maximum value according to the preset hydrogen mixing ratio, until the multi-dimensional real-time data of the furnace is equal to the temperature corresponding to the multi-dimensional dynamic firing parameter curve, so that intelligent, automatic and accurate control of the hydrogen mixing ratio can be achieved according to the multi-dimensional real-time data of the furnace and the multi-dimensional dynamic firing parameter curve.

[0093] In addition, considering the danger of hydrogen, the embodiment adopts a "retreat first and advance later" control strategy for the supply and control of hydrogen. When the temperature in the hearth is reduced, the hydrogen flow is first reduced, and then the natural gas and combustion air flow is reduced. When the temperature in the hearth is increased, the natural gas and combustion air flow is first increased, and then the hydrogen flow is increased. The "retreat first and advance later" control strategy can avoid hydrogen leakage and further ensure the safety and stability of combustion.

[0094] Further, the above-mentioned control of the supply amount of the natural gas pipeline, the hydrogen pipeline and the combustion air pipeline according to the multi-dimensional real-time data of the hearth and the multi-dimensional dynamic firing parameter curve further comprises:

[0095] When the shuttle kiln is shut down, the control system controls the hydrogen pipeline to gradually reduce the hydrogen flow to the first minimum value, then controls the hydrogen pipeline to stop supplying gas until the hydrogen flow in the hydrogen pipeline is zero, delays for the preset time, and then controls the natural gas pipeline to reduce the natural gas flow until the natural gas flow is zero.

[0096] When the shuttle kiln is shut down, the embodiment corresponds to the operation of reducing the multi-dimensional real-time data of the hearth. First, the hydrogen flow is gradually reduced to zero, and then the natural gas and combustion air flow is gradually reduced to zero. The control of the hydrogen flow also adopts a "retreat first" control strategy, which can avoid hydrogen leakage and further ensure the safety and stability of combustion.

[0097] In addition, when the shuttle kiln is shut down, the ignition controller also detects the combustion flame. When no combustion flame is detected, the fuel cut-off electromagnetic valve is automatically closed to ensure that no fuel enters the burner.

[0098] For example, in a certain gas ceramic shuttle kiln, the hydrogen gas is supplied and burned separately, and the burner head is mixed. In the working condition adjustment, a safety control strategy of "closing first and opening later" is adopted for hydrogen. When the ceramic shuttle kiln is normally fired, the instantaneous flow of natural gas is 40 Nm 3 / h, the hydrogen mixing ratio is set to 32%, the control system gradually adjusts the hydrogen electromagnetic flow controller to the set value of 19 Nm 3 / h, at this time the actual hydrogen mixing ratio is 32.2%, and the thermocouple measures the temperature as 1260°C, and the firing temperature of the ceramic product is 1280°C. As the combustion temperature increases, when the thermocouple measures the temperature of 1285°C, which exceeds the firing temperature, the control system first adjusts the hydrogen electromagnetic flow controller parameter to the set value of 4.71 Nm 3 / h, after a delay of 0.5-1 seconds, the control system adjusts the natural gas electromagnetic flow controller parameter to the set value of 10 Nm 3The hydrogen mixing ratio is maintained at 32%, and the safety strategy of hydrogen closing first and opening later is realized, and the carbon dioxide emission of the shuttle kiln is reduced by 11.42%.

[0099] In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the application can be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

[0100] Similarly, it is to be understood that the embodiments of the application can be used in the exact form disclosed herein, or with minor modifications, and the present disclosure is not limited to the exact form disclosed herein. It is also to be understood that the embodiments of the application can be used in combination with other forms disclosed herein.

[0101] It is understood by those skilled in the art that modules or units or components in embodiments can be combined into one module or unit or component, and can be divided into multiple sub-modules or sub-units or sub-components. Except that at least some of such features and / or processes or units are mutually exclusive, all features disclosed in the specification (including the accompanying claims, abstract and drawings) and all processes or units of any method or computer device disclosed can be combined in any combination. Unless explicitly stated otherwise, each feature disclosed in the specification (including the accompanying claims, abstract and drawings) can be replaced by an alternative feature providing the same, equivalent or similar purpose.

[0102] It should be noted that the above-mentioned embodiments illustrate rather than limit the application, and that one skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The application can be implemented by means of both hardware and software, and any combination thereof. In a unit claim, several devices can be listed with a comma. These are considered individually listed elements. The use of the term "about" along with a numerical value indicates that the value includes normal fluctuations of the value to be expected by one of ordinary skill in the art, and also encompasses an exact value of the numerical value.

Claims

1. A shuttle kiln for hydrogen-blended combustion of natural gas, characterized in that, The shuttle kiln for hydrogen-blended combustion of natural gas includes a control system, a natural gas pipeline, a hydrogen pipeline, a blending pipeline, a fuel shut-off solenoid valve, an ignition controller, a burner, a combustion air pipeline, a flue gas pipeline, a temperature detector, and the kiln body. The natural gas pipeline is used to transport natural gas to the blending pipeline; The hydrogen pipeline is used to deliver hydrogen to the mixing pipeline; The blending pipeline connects the natural gas pipeline and the hydrogen pipeline, and is used to blend the hydrogen into the natural gas to obtain hydrogen-blended fuel gas; The burner is connected to the mixing pipeline. The burner is mounted on the kiln body and one end extends into the furnace chamber of the kiln body for burning the hydrogen-blended gas in the furnace chamber. The fuel cut-off solenoid valve is located between the burner and the mixing pipeline. The ignition controller is electrically connected to the burner and the fuel cut-off solenoid valve. It is used to control the fuel cut-off solenoid valve to open according to the ignition command, control the burner to ignite according to the ignition command, and detect the combustion flame. When the combustion flame is detected, it sends a feedback signal to the control system. When the combustion flame is not detected, it controls the fuel cut-off solenoid valve to close. The output end of the combustion air duct is connected to the other end of the burner, and is used to deliver combustion air to the burner. The exhaust pipe is connected to the kiln body and is used to exhaust flue gas from the kiln body. The temperature detector is installed on the kiln body and one end extends into the furnace chamber of the kiln body, and is used to detect multidimensional real-time data of the furnace chamber; the multidimensional real-time data of the furnace chamber is the data received in real time from the temperature detector, flow meter, pressure sensor and flue gas analyzer. The control system is electrically connected to the ignition controller, the temperature detector, the natural gas pipeline, the hydrogen pipeline, and the combustion air pipeline. It is used to control the natural gas pipeline to supply gas, send ignition commands to the ignition controller, control the hydrogen pipeline to supply gas upon receiving feedback signals from the ignition controller, and control the gas supply to the natural gas pipeline, hydrogen pipeline, and combustion air pipeline respectively based on multi-dimensional real-time data and multi-dimensional dynamic firing parameter curves of the furnace. The multi-dimensional dynamic firing parameter curves are curves representing temperature, hydrogen blending ratio, combustion air volume, and pressure values ​​that change over time. These curves are also curves corresponding to the optimal firing effect achieved by training a machine learning algorithm using historical sintering data and corresponding historical firing results. The historical sintering data includes temperature, hydrogen blending ratio, combustion air volume, and pressure values ​​collected after each firing process. The historical firing effect includes historical firing quality, historical energy consumption, and historical pollutant emissions.

2. The shuttle kiln for hydrogen-blended natural gas combustion according to claim 1, characterized in that, The blending pipeline includes a pipe body, with the two ends of the pipe body connected to the output port of the natural gas pipeline and the fuel cut-off solenoid valve, respectively. The output end of the hydrogen pipeline extends into the pipe body from the side wall of the pipe body and is bent so that the output port of the hydrogen pipeline is directly opposite the output port of the pipe body.

3. The shuttle kiln for hydrogen-blended natural gas combustion according to claim 2, characterized in that, The outlet of the hydrogen pipeline is provided with a jet perforated plate, and the jet perforated plate is provided with multiple through holes, which are directly opposite the outlet of the pipe body.

4. The shuttle kiln for hydrogen-blended natural gas combustion according to claim 2, characterized in that, The diameter of the pipe body is larger than the diameter of the outlet of the natural gas pipeline, and the diameter of the outlet of the hydrogen pipeline is smaller than the diameter of the hydrogen pipeline.

5. The shuttle kiln for hydrogen-blended natural gas combustion according to claim 1, characterized in that, The natural gas pipeline is sequentially equipped with a natural gas pressure reducing valve, a natural gas electromagnetic flow controller, and a natural gas check valve; the hydrogen pipeline is sequentially equipped with a hydrogen pressure reducing valve, a hydrogen electromagnetic flow controller, a hydrogen electromagnetic shut-off valve, and a hydrogen check valve, with the natural gas check valve and the hydrogen check valve respectively connected to the blending pipeline; the combustion air pipeline is sequentially equipped with a combustion air controller, a fan, and a combustion air electromagnetic regulating valve, with the combustion air electromagnetic regulating valve connected to the other end of the burner. The control system is electrically connected to the natural gas electromagnetic flow controller, the hydrogen electromagnetic flow controller, the hydrogen electromagnetic shut-off valve, the combustion air controller, and the combustion air electromagnetic regulating valve.

6. The shuttle kiln for hydrogen-blended natural gas combustion according to claim 5, characterized in that, The control system further includes: The acquisition module is used to acquire historical sintering data and corresponding historical firing effects. The historical sintering data includes multi-dimensional parameter setting curves and actual value curves during the historical firing process, as well as key event point data. The performance evaluation module is used to determine the performance deviation, which includes the comprehensive deviation between the actual temperature curve and the target temperature curve, the comprehensive energy consumption per unit product in this firing, and the comparison results with the historical best value or theoretical value. The root cause analysis and reasoning module is used to correlate the performance deviation with the operating parameters in the firing process, and to perform analysis and reasoning using thermodynamic models, heat transfer models and gradient boosting decision tree (GBDT) to obtain the root cause analysis results. The curve update module is used to generate a fine-tuning parameter optimization strategy based on the root cause analysis results, and update the multi-dimensional dynamic firing parameter curve for the next firing according to the parameter optimization strategy.

7. A combustion control method, characterized in that, The combustion control method is applied to the shuttle kiln for hydrogen-blended natural gas combustion according to any one of claims 1-6, and the combustion control method includes: After the combustion air pipeline and flue gas pipeline are operating normally, the control system controls the natural gas pipeline to supply gas and sends ignition commands to the ignition controller. The ignition controller controls the fuel cut-off solenoid valve to open according to the ignition command, controls the burner to ignite according to the ignition command, and detects the combustion flame. When the combustion flame is detected, it sends a feedback signal to the control system, and when the combustion flame is not detected, it controls the fuel cut-off solenoid valve to close. Upon receiving the feedback signal, the control system controls the hydrogen pipeline to supply gas, thereby blending natural gas and hydrogen in the blending pipeline to obtain hydrogen-blended fuel gas. During combustion of the hydrogen-blended fuel gas, the system controls the gas supply to the natural gas pipeline, the hydrogen pipeline, and the combustion air pipeline respectively, based on the multidimensional real-time data and multidimensional dynamic firing parameter curves of the furnace. The multidimensional dynamic firing parameter curves are curves representing temperature, hydrogen blending ratio, combustion air volume, and pressure values ​​that change over time. These curves are also the curves corresponding to the optimal firing effect achieved by training a machine learning algorithm using historical sintering data and corresponding historical firing results. The historical sintering data includes the temperature, hydrogen blending ratio, combustion air volume, and pressure values ​​collected after each firing process. The multidimensional real-time data of the furnace includes data received in real-time from temperature detectors, flow meters, pressure sensors, and flue gas analyzers. The historical firing effect includes historical firing quality, historical energy consumption, and historical pollutant emissions.

8. The combustion control method according to claim 7, characterized in that, The step of controlling the gas supply to the natural gas pipeline, the hydrogen pipeline, and the combustion air pipeline based on the multidimensional real-time data and multidimensional dynamic firing parameter curves of the furnace includes: The current temperature, current hydrogen blending ratio, current combustion air volume, and current pressure value of the furnace are compared with the parameters corresponding to the multidimensional dynamic firing parameter curve. Adjust the current temperature, current hydrogen blending ratio, current combustion air volume, and current pressure value based on the differences in the parameters.

9. The combustion control method according to claim 8, characterized in that, The method of controlling the gas supply to the natural gas pipeline, the hydrogen pipeline, and the combustion air pipeline based on the multidimensional real-time data and multidimensional dynamic firing parameter curves of the furnace further includes: When the shuttle kiln is shut down, the control system controls the hydrogen pipeline to gradually reduce the hydrogen flow rate to a first minimum value, and then controls the hydrogen pipeline to stop supplying gas until the hydrogen flow rate in the hydrogen pipeline is zero. After a preset delay, the control system controls the natural gas pipeline to reduce the natural gas flow rate until the natural gas flow rate is zero.

10. The combustion control method according to claim 7, characterized in that, When the control system controls the gas supply of the natural gas pipeline and the hydrogen pipeline respectively, it also controls the hydrogen pressure to be greater than the natural gas pressure, so that the hydrogen flowing out of the hydrogen pipeline ejects and entrains the natural gas flowing out of the natural gas pipeline.

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