Energy-saving method and system for sequentially heating and stopping heating of tunnel furnace

Abstract

The invention discloses an energy-saving method and system for sequentially heating and stopping heating of a tunnel furnace, and relates to the technical field of tunnel furnace heat control. The energy-saving method comprises the steps that the tunnel furnace is divided into a plurality of independent heating areas, and sensors are configured to collect baking tray position and temperature data in real time; judging whether the heating area is activated or not according to the relative position of the baking tray and the temperature rise requirement; after activation, the control system carries out multi-factor composite adjustment on power output. And after the baking tray leaves the area, whether heating stop is delayed is determined according to the temperature and a thermal inertia model of the baking tray, and whether restart needs to be performed in advance is judged by combining follow-up baking tray track prediction, so that refined energy-saving control and continuous heat treatment management are realized. Through double-factor judgment of the baking tray position and the surface temperature, intelligent activation of the heating area is achieved, preheating in advance or mistaken starting is effectively avoided, the heating precision is improved, and energy consumption is reduced.

Description

Technical Field

[0001] This invention relates to the field of tunnel furnace thermal control technology, specifically to an energy-saving method and system for sequential heating and stopping heating in a tunnel furnace. Background Technology

[0002] Tunnel ovens, widely used continuous heat processing equipment in the food industry, are extensively employed in baking, roasting, ripening, and drying processes. Typical types include direct-fired tunnel ovens, zero-pressure proportional gas-fired tunnel ovens, centralized air-supply gas-fired tunnel ovens, hot air circulation tunnel ovens, and slate tunnel ovens. As modern food processing enterprises increasingly demand consistency in product quality, energy efficiency, and intelligent operation, traditional tunnel oven control methods relying on fixed-time, fixed-temperature heating curves are no longer sufficient to meet the needs of flexible production and refined control. In recent years, technologies such as PLC controllers, gas proportional valve assemblies, temperature sensors, and bus communication have become increasingly prevalent in food heat processing equipment, providing the foundation for more intelligent and responsive heating control systems.

[0003] Despite significant advancements in the structure and materials of tunnel oven systems in food processing, problems such as sluggish response, low energy efficiency, and lack of intelligent judgment persist in heating control strategies. Most current gas-fired tunnel ovens rely on preset heating curves or simple segmented constant temperature control methods, controlling only the entire oven cavity or coarse-grained heating zones, making it difficult to dynamically adjust different baking trays at different stages within the oven. For example, in slab-type and hot-air circulating tunnel ovens, the heating state of food baking trays fluctuates significantly due to differences in arrangement density and initial temperature difference, and traditional systems lack the ability to dynamically identify and control these details. Furthermore, traditional systems cannot judge or predict the heating status based on thermal inertia or tray condition after a baking tray enters or leaves a certain area, often shutting off heating with timed or fixed strategies, leading to energy waste and inconsistent product heat treatment. Especially in continuous food production lines, where the baking tray cycle is rapid and numerous, without establishing a collaborative judgment mechanism of "real-time tray trajectory + heat demand assessment + subsequent prediction," it will be impossible to achieve the optimal effect of simultaneously saving energy and controlling temperature. This invention addresses the aforementioned problems by providing a sequential heating and intelligent shutdown method based on state perception and predictive scheduling suitable for tunnel ovens used in food processing. This method significantly improves the accuracy of heating response, system energy efficiency ratio, and processing consistency. Summary of the Invention

[0004] In view of the above-mentioned problems, the present invention is proposed.

[0005] Therefore, the technical problem solved by this invention is that existing heating control methods for food tunnel ovens have problems such as coarse heating response, lack of real-time judgment mechanism, inability of power adjustment to adapt to changes in the state of the baking tray, inability of the heating stop strategy to take into account both thermal inertia and the predictive behavior of the baking tray, and how to construct an intelligent zone heating and energy-saving scheduling mechanism that can adapt to the continuous operation of multiple baking trays.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an energy-saving method for sequential heating and stopping heating in a tunnel oven, comprising dividing the tunnel oven into multiple independent heating zones along its length, configuring an independent heating device and temperature control device for each heating zone, configuring sensors for data acquisition, and acquiring data of the baking trays entering the tunnel oven in real time; determining whether to activate the corresponding heating zone based on the relative position of the baking tray and the heating zone combined with the temperature status; when the heating conditions are met, the control system performs composite adjustment of the heating output power; after the baking tray leaves the heating zone, determining whether to perform delayed heating stop based on the temperature of the baking tray leaving the zone and the thermal inertia characteristics of the heating zone, and predicting whether there is a new round of heating demand based on the operating status of other baking trays that have not yet entered the system, and controlling whether to maintain, shut down or restart.

[0007] As a preferred embodiment of the energy-saving method for sequential heating and stopping heating of the tunnel furnace described in this invention, wherein: dividing the tunnel furnace into multiple independent heating zones along its length includes dividing the length of each heating zone according to a preset distance; the heating device adopts an electric heating tube, a ceramic heating element, or an infrared heating plate; each heating zone is equipped with an independent temperature control device and a power control device; the temperature control device is a PLC controller; and the power control device is a relay.

[0008] As a preferred embodiment of the energy-saving method for sequential heating and stopping heating of the tunnel furnace described in this invention, the configuration of sensors for data acquisition includes setting a baking tray identification device at the entrance of the tunnel furnace to detect the entry of the baking tray and record the time and number; setting non-contact temperature sensors and position sensors at the entrance of each heating zone; setting a furnace cavity temperature sensor in the middle of the heating zone; and setting a surface temperature detector at the outlet of the heating zone.

[0009] As a preferred embodiment of the energy-saving method for sequential heating and stopping heating of the tunnel oven described in this invention, the step of determining whether to activate the corresponding heating zone based on the relative position of the baking tray and the heating zone combined with the temperature status includes determining the proximity state of the baking tray based on the distance relationship between the current position of the baking tray and the starting coordinate of the heating zone, and determining whether there is a temperature rise requirement based on the temperature difference between the current temperature of the baking tray and the target temperature of the heating zone, and triggering the heating power output.

[0010] As a preferred embodiment of the energy-saving method for sequential heating and stopping heating of the tunnel furnace described in this invention, the composite regulation includes the control system making a comprehensive judgment based on the current temperature difference status of the heating zone, the temperature change trend, and the historical temperature difference integral, and dynamically adjusting the power output signal to change the regulation strategy.

[0011] As a preferred embodiment of the energy-saving method for sequential heating and stopping heating of the tunnel oven described in this invention, the delayed heating includes: after the baking tray leaves a certain area, the sensor acquires the surface temperature and constructs a residual heating model based on the thermal decay characteristics of that area to evaluate whether to maintain the heating zone in a heat preservation state; when the residual heating is insufficient to meet the set temperature target and no subsequent baking tray arrives, the control system instructs the heating zone to switch to a standby or off state.

[0012] As a preferred embodiment of the energy-saving method for sequential heating and stopping heating of the tunnel oven described in this invention, the new round of heating demand includes the control system performing real-time trajectory analysis on all baking trays that have not yet entered the tunnel oven or are running in the previous area, and predicting the time point when they approach a specific heating zone based on speed, entry time and expected arrival time; if the system determines that a baking tray is about to enter the heating zone, it maintains or activates the heating state in advance.

[0013] Another objective of this invention is to provide an energy-saving system for sequential heating and stopping heating of a tunnel oven. This system solves the problems of single activation logic, delayed response, and low energy utilization efficiency in current tunnel oven zone heating control technologies by using a dynamic heating activation mechanism based on the fusion of baking pan position and temperature rise demand.

[0014] As a preferred embodiment of the energy-saving system for sequential heating and stopping heating of the tunnel oven described in this invention, the system includes: a zone sensing data acquisition module, a sequential heating module, and a heating maintenance module; the zone sensing data acquisition module is used to divide the tunnel oven into multiple independent heating zones along its length, and to configure an independent heating device and temperature control device for each heating zone, and to configure sensors for data acquisition to obtain data on the baking trays entering the tunnel oven in real time; the sequential heating module is used to determine whether to activate the corresponding heating zone based on the relative position of the baking tray and the heating zone and the temperature status; when the heating conditions are met, the control system performs composite adjustment of the heating output power; the heating maintenance module is used to determine whether to perform delayed heating stop after the baking tray leaves the heating zone based on the temperature of the baking tray leaving the zone and the thermal inertia characteristics of the heating zone, and to predict whether there is a new round of heating demand based on the operating status of other baking trays that have not yet entered the system, and to control whether to maintain, shut down, or restart.

[0015] A computer device includes a memory and a processor, the memory storing a computer program, the processor executing the computer program to implement an energy-saving method for sequential heating and stopping heating in a tunnel furnace.

[0016] A computer-readable storage medium having a computer program stored thereon, the computer program being executed by a processor to implement the steps of an energy-saving method for sequential heating and stopping heating of a tunnel furnace.

[0017] The beneficial effects of this invention are as follows: The energy-saving method for sequential heating and stopping heating in the tunnel oven provided by this invention, by combining the heating activation control logic of the real-time position of the baking tray and the temperature rise requirement, can effectively avoid premature start-up or ineffective heating of the heating zone, improve energy efficiency and enhance temperature control accuracy. After the baking tray is removed, the system dynamically decides whether to stop heating based on thermal inertia and the future position of the baking tray, taking into account waste heat utilization and predictive response, avoiding frequent start-up and stop-up of the heating zone, and improving control continuity and energy utilization. Through the dual-factor judgment of baking tray position and surface temperature, intelligent activation of the heating zone is achieved, effectively avoiding preheating or false start-up, improving heating accuracy and reducing energy consumption. The sequential heating and intelligent stopping control method is particularly suitable for food processing equipment with significant thermal inertia and continuous process flow, such as direct-fired, hot air circulation, zero-pressure proportional, or slab-type gas tunnel ovens. Through the dynamic division of the heating zone, real-time perception of the food baking tray status, and predictive scheduling control mechanism, it can effectively solve the problems of energy waste and inconsistent product heating caused by uneven energy distribution, delayed temperature control response, or frequent start-up and stop-up of the heating zone in existing equipment. This invention improves the adaptive capability and operational stability of the entire production line's thermal energy management, exhibiting good process compatibility and industry-wide application value. This invention also achieves better results in terms of control precision and energy consumption reduction. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 The above is an overall flowchart of an energy-saving method for sequential heating and stopping heating of a tunnel furnace, provided in the first embodiment of the present invention. Detailed Implementation

[0020] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0021] Example 1, referring to Figure 1 As one embodiment of the present invention, an energy-saving method for sequential heating and stopping heating of a tunnel furnace is provided, comprising: S1: Divide the tunnel oven into multiple independent heating zones along its length, and equip each heating zone with an independent heating device and temperature control device. Configure sensors to collect data and obtain real-time data on the baking trays entering the tunnel oven.

[0022] Furthermore, the tunnel furnace is divided into multiple independent heating zones along its length, including dividing the length of each heating zone according to a preset distance. The heating device uses electric heating tubes, ceramic heating plates, or infrared heating plates. Each heating zone is equipped with an independent temperature control device and a power control device. The temperature control device is a PLC controller, and the power control device is a relay.

[0023] It should be noted that the tunnel furnace is first divided into multiple independent heating zones along its length from the feed end to the discharge end. These zones are physically independent in structure, but logically managed and scheduled by a central control system. The length of each heating zone is preferably set to 1.5 meters to 3 meters, more preferably 2 meters. The number of heating zones is set according to the total length of the tunnel furnace structure, and it is generally recommended to set it to 5 to 15 zones.

[0024] Each heating zone is equipped with an independent heating element, which can be a conventional industrial heat source such as an electric heating tube, ceramic heating element, or infrared heating plate. To achieve precise heating control, each heating zone is also equipped with an independent temperature control device and a power control device. The temperature control device is a PLC control module, and the power control device is a relay or solid-state relay. For ease of management and operation, the system numbers each heating zone as Z1, Z2, Z3, Z4… Z… n .

[0025] It should be noted that the data acquisition using sensors includes installing a baking tray identification device at the tunnel furnace entrance to detect the entry of the baking tray and record its time and number; installing non-contact temperature and position sensors at the entrances of each heating zone; installing a furnace cavity temperature sensor in the middle of the heating zone; and installing a surface temperature detector at the outlet of the heating zone. To achieve the sensing and control of the operating status and temperature field of the baking trays inside the furnace, the following types of sensors are deployed at key locations within the tunnel furnace: The baking tray enters the recognition device, which is set at the entrance of the tunnel furnace and is used to detect whether the baking tray enters the system. Devices such as infrared pair - emission switches and laser ranging sensors can be used to complete the recognition. The system combines barcode or RFID modules to achieve the unique identification record of the baking tray.

[0026] The inlet temperature sensor of the heating zone, one set is equipped for each heating zone, is used to detect whether the baking tray enters the current section and obtain its surface temperature, which is achieved by combining a non - contact infrared thermometer and a photoelectric detector.

[0027] The temperature sensor in the middle of the furnace cavity, 1 - 2 thermocouples or PT100 temperature probes are set in the middle of each heating zone, and are used to measure the internal furnace temperature of the heating zone as the feedback signal of the control system.

[0028] The baking tray status detector at the outlet of the heating zone, an infrared thermometer and a photoelectric switch are arranged, and are used to monitor whether the baking tray has passed through this area and the surface temperature when leaving the area.

[0029] The data acquisition frequency is preferably updated once every 1 to 2 seconds, and is flexibly adjusted according to the running speed of the baking tray.

[0030] S2: Determine whether to activate the corresponding heating zone according to the relative position of the baking tray and the heating zone combined with the temperature state. When the heating conditions are met, the control system performs a compound adjustment on the heating output power.

[0031] Furthermore, determining whether to activate the corresponding heating zone according to the relative position of the baking tray and the heating zone combined with the temperature state includes judging the approaching state of the baking tray according to the distance relationship between the current position of the baking tray and the starting coordinate of the heating zone, and at the same time, combining the temperature difference between the current temperature of the baking tray and the target temperature of the heating zone to determine whether there is a temperature rise requirement and trigger the heating power output. The compound adjustment includes that the control system comprehensively judges according to the temperature difference state, temperature change trend and historical temperature difference integration situation of the current heating zone, dynamically adjusts the power output signal, and changes the control strategy.

[0032] In the tunnel furnace, although each heating zone is physically an independent section, in the heating control logic, it should have the characteristic of linkage response to adapt to the dynamic characteristics of the continuous operation of the baking tray. Through constructing a fusion model of baking tray position perception and temperature rise demand, intelligent activation and response control of the heating zone are carried out.

[0033] The control system collects through sensors the initial time when each baking tray enters the tunnel furnace , and combines the baking tray speed obtained by the inlet speed sensor to estimate in real - time the displacement position of the baking tray at any moment

[0034] in, For the first Each baking tray at time The location. This refers to the baking pan's running speed. This refers to the time when the baking tray enters the tunnel oven.

[0035] To determine whether the baking pan is about to enter a certain heating zone The system uses the Sigmoid function to build a proximity judgment model. , represented as:

[0036] in, For the first The baking tray for the first The proximity of the districts. For the first The slope coefficient of the control response in the zone. For the first The physical starting point of the heating zone.

[0037] Output value in the range Between these values, the closer the value is to 1, the closer the baking pan is to the heating zone.

[0038] After the proximity assessment, the control system further calculates whether the baking pan requires a temperature rise. This is done by measuring the current surface temperature of the baking pan. Combined with the target set temperature of the heating zone A temperature rise model was established using a time decay integral model. , represented as:

[0039] in, heating zone The target temperature. For baking pans at a historic moment Surface temperature. For the first Temperature difference response attenuation coefficient in the heating zone. To minimize the amount and prevent division by zero anomalies. This is the time variable for integration.

[0040] By combining the proximity judgment function with the temperature rise demand function, the system generates a comprehensive activation output model of the heating zone for the baking pan. , represented as:

[0041] in, heating zone The maximum output ratio. This is the normalization coefficient for temperature difference. In response to offset adjustment.

[0042] The output range of this model is This indicates that at a certain moment, the baking pan... For heating zone The degree of power activation can be directly used as the basis for outputting PWM duty cycle, voltage regulation percentage, or other proportional control signals.

[0043] The controller operates at a preset cycle frequency. Perform the sampling and update process to obtain the activation functions of each region. The output value is then transmitted to the corresponding heating actuator.

[0044] If a certain heating zone Continuously below the set power threshold If the system determines that there is no need to activate the area, it will control the area to enter the skip zone state or standby mode to avoid energy waste.

[0045] S3: After the baking pan leaves the heating zone, determine whether to perform delayed heating based on the temperature of the baking pan leaving the zone and the thermal inertia characteristics of the heating zone. Combine the operating status of other baking pans that have not yet entered the system to predict whether there is a new round of heating demand, and control whether to maintain, shut down or restart.

[0046] Furthermore, delayed heating includes the following: after the baking tray leaves a certain area, the sensor acquires the surface temperature and constructs a residual heating model based on the heat decay characteristics of that area to assess whether to keep the heating zone in a heat preservation state. When the residual heating is insufficient to meet the set temperature target and no subsequent baking tray arrives, the control system instructs the heating zone to switch to standby or off state.

[0047] This invention achieves intelligent activation of the baking pan before it enters the heating zone, and also addresses the energy management problem after the baking pan leaves. It constructs a sequential shutdown strategy that integrates thermal inertia response and predictive control, which is divided into three stages: baking pan departure detection, heat preservation delay modeling, and future baking pan prediction and evaluation. Finally, it dynamically determines whether to maintain, shut down or reactivate the heating zone.

[0048] When the baking pan is removed When the heating zone is activated, the exit photoelectric sensor or infrared detection device will trigger the recording of the departure time. At the same time, the system acquires the surface temperature of the baking pan. This temperature value is related to the target temperature of the heating zone. The difference will be used as the basis for judging whether the heating is sufficient.

[0049] To fully utilize regional thermal inertia and avoid abruptly stopping heating before the baking pan is fully heated, residual heating is analyzed to determine whether to delay the heating shutdown. Residual heat control function. The expression is as follows: Delay control function:

[0050] in, For the first The baking tray left the first After the zone, the intensity of delayed insulation demand at the current moment. heating zone The thermal decay coefficient. For the first The baking tray left the first The time in the district. This is the actual surface temperature of the baking pan when it leaves the zone. Set a target temperature for the heating zone.

[0051] The larger the output value, the less residual heat there is, the greater the temperature difference, and the shorter the current time is from the baking pan to the heat zone. The system will tend to continue heating and keeping the food warm. To avoid accidental shutdown of the heating zone due to the approaching baking tray, the heating is adjusted based on the subsequent activation trend of the baking tray using the activation star, as shown below:

[0052] in, For all baking pans at the current moment, the first... Predicted activation trend of the heating zone. For the first The position of the baking pan at the current moment. For the first The coordinates of the entrance to the area. This is the distance activation slope factor. For the first The baking time for each baking tray. This is the time decay coefficient, which decays the prediction effect at times far from the predicted time.

[0053] The distance between the baking tray and the target heating zone, as well as the time it takes to enter the oven, are taken into account to dynamically assess whether a baking tray is about to enter the current area.

[0054] The system compares the delayed response functions. With predictive activation function The magnitude of the value determines whether heating should continue. The control input is represented as:

[0055] in, heating zone The current input for the heat preservation or heating maintenance decision. If And the duration is greater than the threshold If this occurs, the system will shut off heating in that area. If during this period... If the temperature rises above the threshold again, the system will interrupt the cooling process and reactivate the zone.

[0056] The entire heating shutdown logic is based on With a refresh cycle of one second, the system continuously updates itself, making the heating zone more intelligent and timely, effectively avoiding energy redundancy and temperature control imbalance.

[0057] It should be noted that the new round of heating demand includes the control system performing real-time trajectory analysis on all baking trays that have not yet entered the tunnel oven or are running in the previous area, predicting the time point when they approach a specific heating zone based on speed, entry time and expected arrival time.

[0058] If the system determines that a baking tray is about to enter the heating zone, it will maintain or activate the heating state in advance.

[0059] Example 2 is the second embodiment of the present invention, which differs from the previous embodiment in that: If a function is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0060] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-including system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device.

[0061] More specific examples (a non-exhaustive list) of computer-readable media include: electrical connections (electronic devices) having one or more wires, portable computer disk drives (magnetic devices), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Furthermore, computer-readable media can even be paper or other suitable media on which programs can be printed, because programs can be obtained electronically, for example, by optically scanning the paper or other media, followed by editing, interpreting, or otherwise processing as necessary, and then stored in computer memory.

[0062] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0063] Example 3 is the third embodiment of the present invention. This embodiment provides a system for wind turbine abnormality detection and fault early warning method, including a zone sensing data acquisition module, a sequential heating module, and a heating maintenance module.

[0064] The system comprises several modules: a zone-based sensing data acquisition module, which divides the tunnel oven into multiple independent heating zones along its length, and an independent heating device and temperature control device for each zone; sensors for data acquisition, obtaining real-time data on the baking trays entering the tunnel oven; a sequential heating module, which determines whether to activate a corresponding heating zone based on the relative position of the baking tray and the temperature status; and a heating maintenance module, which determines whether to implement delayed heating shutdown after the baking tray leaves the heating zone based on the tray's temperature and the thermal inertia characteristics of the heating zone, and predicts whether a new round of heating demand will occur based on the operating status of other baking trays not yet entering the system, controlling whether to maintain, shut down, or restart the heating.

[0065] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An energy-saving method for sequential heating and stopping heating in a tunnel furnace, characterized in that, include: The tunnel oven is divided into multiple independent heating zones along its length, and each heating zone is equipped with an independent heating device and temperature control device. Sensors are configured to collect data and obtain real-time data on the baking trays entering the tunnel oven. The control system determines whether to activate the corresponding heating zone based on the relative position of the baking pan and the heating zone and the temperature status. When the heating conditions are met, the control system performs a composite adjustment of the heating output power. After the baking pan leaves the heating zone, the system determines whether to perform a delayed heating shutdown based on the temperature of the baking pan leaving the zone and the thermal inertia characteristics of the heating zone. It also predicts whether there will be a new round of heating demand by combining the operating status of other baking pans that have not yet entered the system, and controls whether to maintain, shut down or restart the heating.

2. The energy-saving method for sequential heating and stopping heating of a tunnel furnace as described in claim 1, characterized in that: The process of dividing the tunnel furnace into multiple independent heating zones along its length includes dividing the length of each heating zone according to a preset distance. The heating device uses electric heating tubes, ceramic heating plates, or infrared heating plates. Each heating zone is equipped with an independent temperature control device and a power control device. The temperature control device is a PLC controller, and the power control device is a relay.

3. The energy-saving method for sequential heating and stopping heating of a tunnel furnace as described in claim 2, characterized in that: The configuration of sensors for data acquisition includes setting up a baking tray identification device at the entrance of the tunnel oven to detect the entry of the baking tray and record the time and number; setting up non-contact temperature sensors and position sensors at the entrance of each heating zone; setting up a furnace cavity temperature sensor in the middle of the heating zone; and setting up a surface temperature detector at the outlet of the heating zone.

4. The energy-saving method for sequential heating and stopping heating of a tunnel furnace as described in claim 3, characterized in that: The step of determining whether to activate the corresponding heating zone based on the relative position of the baking pan and the heating zone and the temperature status includes determining the proximity of the baking pan based on the distance relationship between the current position of the baking pan and the starting coordinate of the heating zone, and determining whether there is a temperature rise requirement based on the temperature difference between the current temperature of the baking pan and the target temperature of the heating zone, and triggering the heating power output.

5. The energy-saving method for sequential heating and stopping heating of a tunnel furnace as described in claim 4, characterized in that: The composite regulation includes the control system making a comprehensive judgment based on the current temperature difference status of the heating zone, the temperature change trend, and the historical temperature difference integral, and dynamically adjusting the power output signal to change the regulation strategy.

6. The energy-saving method for sequential heating and stopping heating of a tunnel furnace as described in claim 5, characterized in that: The delayed heating shutdown includes, after the baking pan leaves a certain area, the sensor acquires the surface temperature and, in conjunction with the thermal decay characteristics of that area, constructs a residual heating model to assess whether to maintain the heating zone in a heat preservation state. When the residual heating is insufficient to meet the set temperature target and no subsequent baking tray arrives, the control system instructs the heating zone to switch to standby or off state.

7. The energy-saving method for sequential heating and stopping heating of a tunnel furnace as described in claim 6, characterized in that: The new round of heating demand includes the control system performing real-time trajectory analysis on all baking trays that have not yet entered the tunnel oven or are running in the previous area, and predicting the time point when they approach a specific heating zone based on speed, entry time and expected arrival time. If the system determines that a baking tray is about to enter the heating zone, it will maintain or activate the heating state in advance.

8. A system employing an energy-saving method for sequential heating and stopping heating of a tunnel furnace as described in any one of claims 1 to 7, characterized in that: It includes a zone-sensing data acquisition module, a sequential heating module, and a heating maintenance module; The partition sensing data acquisition module is used to divide the tunnel oven into multiple independent heating zones along its length, and to configure an independent heating device and temperature control device for each heating zone. It is also equipped with sensors to collect data and obtain data on the baking trays entering the tunnel oven in real time. The sequential heating module is used to determine whether to activate the corresponding heating zone based on the relative position of the baking pan and the heating zone and the temperature status; when the heating conditions are met, the control system performs a composite adjustment of the heating output power. The heating maintenance module is used to determine whether to perform delayed heating stop after the baking pan leaves the heating zone based on the temperature of the baking pan leaving the zone and the thermal inertia characteristics of the heating zone. It also predicts whether there will be a new round of heating demand by combining the operating status of other baking pans that have not yet entered the system, and controls whether to maintain, shut down or restart the heating.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the energy-saving method for sequential heating and stopping heating of the tunnel furnace according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the energy-saving method for sequential heating and stopping heating of the tunnel furnace according to any one of claims 1 to 7.

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