CN-122004261-A - Energy-saving method and system for sequentially heating and stopping heating of tunnel furnace

CN122004261ACN 122004261 ACN122004261 ACN 122004261ACN-122004261-A

Abstract

The invention discloses an energy-saving method and a system for sequentially heating and stopping heating of a tunnel furnace, and relates to the technical field of tunnel furnace heat control, wherein the method comprises the steps of dividing the tunnel furnace into a plurality of independent heating areas, configuring a sensor to acquire the position and temperature data of a baking tray in real time, and judging whether to activate the heating areas according to the relative position and temperature rise requirements of the baking tray; after activation, the control system performs a multi-factor compound adjustment of the power output. After the baking tray leaves the zone, determining whether to delay stopping heating according to the temperature and the thermal inertia model, and simultaneously judging whether to restart in advance according to the follow-up baking tray track prediction, so as to realize refined energy-saving control and continuous heat treatment management. Through the double-factor judgment of the position and the surface temperature of the baking tray, the intelligent activation of the heating area is realized, the preheating or the false start in advance is effectively avoided, the heating accuracy is improved, and the energy consumption is reduced.

Inventors

ZHU ZELI
LI HONGYANG
ZHANG DAIRONG

Assignees

湖南蓝伯化工有限责任公司

Dates

Publication Date: 20260512
Application Date: 20251230

Claims (10)

1. An energy saving method for sequentially heating and stopping heating of a tunnel furnace, comprising: Dividing the tunnel furnace into a plurality of independent heating areas along the length direction, configuring an independent heating device and a temperature control device for each heating area, configuring a sensor for data acquisition, and acquiring data of a baking tray entering the tunnel furnace in real time; judging whether to activate the corresponding heating zone according to the relative position of the baking tray and the heating zone and combining the temperature state, and when the heating condition is met, performing compound adjustment on the heating output power by the control system; After the baking tray leaves the heating area, judging whether to execute delayed heat stopping based on the temperature of the baking tray leaving the heating area and the thermal inertia characteristic of the heating area, predicting whether a new heating requirement exists according to the running states of other baking trays which are not entered in the system, and controlling whether to maintain, close or restart.
2. The method for saving energy by sequentially heating and stopping heating of a tunnel furnace according to claim 1, wherein dividing the tunnel furnace into a plurality of independent heating areas along the length direction comprises dividing the length of each heating area according to a preset distance, wherein the heating device adopts an electric heating tube, a ceramic heating plate or an infrared heating plate, each heating area is provided with an independent temperature control device and a power control device, the temperature control device is a PLC, and the power control device is a relay.
3. The method for saving energy by sequentially heating and stopping heating of a tunnel furnace according to claim 2, wherein the configuration of the sensor for data acquisition comprises arranging a baking tray identification device at an inlet of the tunnel furnace for detecting the entering of the baking tray and recording time and number, arranging a non-contact temperature sensor and a position sensor at an inlet of each heating zone, arranging a furnace chamber temperature sensor at the middle part of the heating zone, and arranging a surface temperature detector at an outlet of the heating zone.
4. The method for saving energy by sequentially heating and stopping heating of a tunnel furnace according to claim 3, wherein judging whether to activate the corresponding heating zone according to the relative position of the baking tray and the heating zone and the temperature state comprises judging the approaching state of the baking tray according to the distance relation between the current position of the baking tray and the starting coordinate of the heating zone, and simultaneously determining whether a temperature rise requirement exists and triggering heating power output according to the temperature difference between the current temperature of the baking tray and the target temperature of the heating zone.
5. The method for saving energy by sequentially heating and stopping heating of a tunnel furnace according to claim 4, wherein the compound regulation comprises the step of dynamically regulating a power output signal according to comprehensive judgment of the temperature difference state, the temperature change trend and the historical temperature difference integration condition of the current heating zone by a control system to change a regulation strategy.
6. The method for saving energy by sequentially heating and stopping heating of a tunnel oven according to claim 5, wherein the delaying of stopping heating comprises the steps of acquiring surface temperature by a sensor after a baking tray leaves a certain area, constructing a residual heating model by combining heat attenuation characteristics of the area, and evaluating whether a heating area is maintained in a heat preservation state; When the residual heating is insufficient to meet the set temperature target and no baking tray arrives later, the control system instructs the heating zone to switch to a standby or off state.
7. The method for saving energy by sequentially heating and stopping heating of a tunnel oven according to claim 6, wherein the new heating request comprises real-time track analysis of all baking trays which are not entered into the tunnel oven or are running in the previous area by the control system, and predicting a time point approaching a specific heating area based on the speed, the entering time and the expected arrival time; If the system determines that the baking tray is about to enter the heating zone, the heating state is maintained or activated in advance.
8. A system adopting the energy-saving method for sequentially heating and stopping heating of the tunnel furnace according to any one of claims 1-7, which is characterized by comprising a partition sensing data acquisition module, a sequential heating module and a heating maintenance module; The partition sensing data acquisition module is used for dividing the tunnel furnace into a plurality of independent heating areas along the length direction, configuring an independent heating device and a temperature control device for each heating area, configuring a sensor for data acquisition, and acquiring data of a baking tray entering the tunnel furnace in real time; The sequential heating module is used for judging whether to activate the corresponding heating zone according to the relative position of the baking tray and the heating zone and the temperature state; The heating maintaining module is used for judging whether to execute delayed heat stopping based on the temperature of the baking tray leaving the heating area and the thermal inertia characteristic of the heating area after the baking tray leaves the heating area, predicting whether a new heating requirement exists according to the running states of other baking trays which are not entered in the system, and controlling whether to maintain, close or restart.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, carries out the steps of the energy saving method of sequential heating and stopping heating of a tunnel furnace according to any one of claims 1 to 7.
10. A computer-readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the energy saving method of sequential heating and stopping heating of a tunnel furnace according to any one of claims 1 to 7.

Description

Energy-saving method and system for sequentially heating and stopping heating of tunnel furnace Technical Field The invention relates to the technical field of tunnel furnace heat control, in particular to an energy-saving method and an energy-saving system for sequentially heating and stopping heating of a tunnel furnace. Background The tunnel furnace is widely used as continuous thermal processing equipment in the food industry and is widely used for baking, roasting, curing, drying and other links, and typical forms of the tunnel furnace comprise a direct-fired tunnel furnace, a zero-pressure proportional gas tunnel furnace, a concentrated air supply type gas tunnel furnace, a hot air circulation type tunnel furnace, a stone slab tunnel furnace and the like. Along with the increasing demands of modern food processing enterprises on product quality consistency, energy utilization efficiency and intelligent level, the traditional tunnel furnace control mode which depends on a fixed time and a fixed temperature heating curve is difficult to meet the demands of flexible production and fine control. In recent years, technologies such as a PLC (programmable logic controller), a fuel gas proportional valve group, temperature sensing, bus communication and the like are gradually popularized in food thermal processing equipment, and basic conditions are provided for realizing a more intelligent and responsive heating control system. Although tunnel oven systems in the food processing field have made great progress in terms of structure and materials, problems of response delay, low energy efficiency utilization, lack of intelligent judgment, and the like are still common in the aspect of heating control strategies. Most of the current gas-fired tunnel furnaces rely on a preset heating curve or a simple sectional constant temperature control mode, the control object is a furnace chamber integral or coarse-grain heating zone, and dynamic adjustment of different baking trays in the furnace at different stages is difficult to realize. For example, dan Banshi and hot air circulating tunnel ovens exhibit significant fluctuations in the heated state of the food baking trays due to differences in arrangement density, initial temperature differentials, etc., whereas conventional systems lack the ability to dynamically identify and regulate such details. In addition, after the baking tray enters or leaves a certain area, the traditional system cannot judge and predict based on thermal inertia or the state of the baking tray, and heating is often turned off in a timing or fixed strategy, so that the problems of energy waste and inconsistent heat treatment of products are caused. Especially in a continuous food production line, the baking tray beats are rapid and large in number, and if a cooperative judgment mechanism of 'real-time track of the baking tray, heat demand evaluation and follow-up prediction' cannot be established, the energy-saving and temperature-control and re-optimization effects cannot be realized. The invention aims at the problems, and provides a sequential heating and intelligent heat stopping method based on state sensing and predictive scheduling, which is suitable for a food processing tunnel furnace, so that the accuracy of heating response, the energy efficiency ratio of a system and the processing consistency are obviously improved. Disclosure of Invention The present invention has been made in view of the above-described problems. Therefore, the technical problems that the heating response is rough, a real-time judging mechanism is lacked, the power adjustment cannot adapt to the change of the baking tray state, the heat stopping strategy cannot consider both the thermal inertia and the baking tray prediction behavior, and the intelligent partition heating and energy-saving scheduling mechanism adapting to the continuous operation of a plurality of baking trays are constructed in the conventional heating control method of the food tunnel furnace are solved. The energy-saving method for sequentially heating and stopping heating of the tunnel furnace comprises the following steps of dividing the tunnel furnace into a plurality of independent heating areas along the length direction, configuring an independent heating device and a temperature control device for each heating area, configuring a sensor to acquire data of a baking tray entering the tunnel furnace in real time, judging whether a corresponding heating area is activated according to the relative position of the baking tray and the heating area and the temperature state, carrying out compound regulation on heating output power by a control system when heating conditions are met, judging whether delayed stopping heating is carried out or not based on the temperature of the baking tray leaving the heating area and the thermal inertia characteristics of the heating area after the baking tray leaves the heating area, predicting whether a new h