Annealing kiln waste heat recycling method and related device

Abstract

The invention relates to an annealing kiln waste heat recycling method and a related device. The method comprises the following steps that the production batch condition and the production schedule of each annealing kiln are obtained; determining waste heat gas standard emission information of a production batch corresponding to the annealing kiln; acquiring current environment air temperature and current environment air pressure information corresponding to the annealing kiln to adjust waste heat gas emission information of the annealing kiln so as to obtain waste heat gas adjustment emission information; based on the current time and the environment temperature, the plan demand condition of waste heat is obtained; and controlling the opening degree of a non-return air valve of each gas buffer chamber and the power of a variable-frequency traction fan corresponding to a waste heat utilization project based on the waste heat gas adjustment emission information and the plan demand condition of the waste heat. Real-time adjustment can be achieved according to the actual working condition of the annealing kiln, so that the waste heat utilization efficiency is improved to the maximum extent, and the production quality of glass is guaranteed.

Description

Technical Field

[0001] The present application relates to the field of annealing kilns, and in particular to a method for recovering waste heat from an annealing kiln and related devices. Background Art

[0002] In the glass manufacturing industry, the annealing furnace is one of the key heat treatment equipment. Its main function is to reduce the stress in the glass by controlling the temperature gradient, thereby improving the physical properties and quality stability of the product. In the float glass production line, the continuously produced glass strip needs to be heat treated in the annealing furnace to meet the needs of subsequent processing and application. The annealing furnace is usually divided into multiple temperature zones (such as high temperature zone, medium temperature zone and low temperature zone), and the temperature of each zone decreases step by step to form a heat treatment environment suitable for different production stages.

[0003] During the heat treatment process, the annealing furnace will produce a large amount of high-temperature waste heat gas. How to efficiently recover and utilize these waste heat resources is an urgent problem facing the glass manufacturing industry. With the continuous rise in energy costs and the promotion of energy-saving and environmental protection policies, waste heat utilization has become an important means for companies to reduce production costs and carbon emissions. However, since the temperature of the high-temperature gas discharged from the annealing furnace varies greatly in different temperature zones, and the exhaust in each zone is independent of each other, how to recover and utilize the waste heat without affecting the quality of glass production has become a technical problem.

[0004] The high-temperature gases discharged from different temperature zones of each annealing lehr have independent flow paths. If they are directly connected for waste heat recovery, the gas flows between different annealing lehrs will interfere with each other, resulting in unstable air pressure and temperature, affecting the temperature control accuracy of the annealing lehr. This instability directly affects the uniformity of the glass annealing process, and thus affects the product yield. In actual production, the work schedules of different annealing lehrs are different, and the time and demand for waste heat discharge vary with the production plan. In addition, there are also differences in external conditions such as ambient temperature and air pressure in the annealing lehr. Especially in winter and summer or when the environment changes greatly during day and night, the gas temperature and flow fluctuations in different areas are more significant. Summary of the invention

[0005] In order to achieve real-time adjustment according to the actual working conditions of the annealing furnace, so as to maximize the waste heat utilization efficiency and ensure the production quality of glass, the present application provides an annealing furnace waste heat recovery method and related devices.

[0006] In the first aspect, the present application provides a method for recovering waste heat from an annealing kiln, which adopts the following technical solution:

[0007] A method for recovering waste heat from an annealing kiln comprises the following steps:

[0008] S1. Obtain the production batch information and production schedule of each annealing kiln;

[0009] S2. Determine the standard emission information of waste heat gas corresponding to the production batch of the annealing kiln; wherein the standard emission information of waste heat gas includes waste heat gas emission flow information, waste heat gas emission temperature information and waste heat gas emission pressure information;

[0010] S3. Obtain the current ambient temperature and current ambient pressure information corresponding to the annealing kiln to adjust the waste heat gas emission information of the annealing kiln to obtain the waste heat gas emission adjustment information;

[0011] S4. Based on the current time and ambient temperature, obtain the planned demand for waste heat;

[0012] S5. Based on the waste heat gas adjustment emission information and the planned demand for waste heat, the opening of the check valve of each gas buffer chamber and the power of the variable frequency traction fan corresponding to the waste heat utilization project are controlled.

[0013] Optionally, the S5 comprises the following steps:

[0014] S51. Based on the current temperature and time, matching the waste heat plan demand;

[0015] S52. According to the waste heat plan, the mixing chambers are allocated to different waste heat utilization projects, wherein one waste heat utilization project corresponds to a group of mixing chambers;

[0016] S53. Based on the waste heat gas adjustment emission information and the planned demand for waste heat, adjust the opening of the check valve of each gas buffer chamber and the power of the variable frequency traction fan corresponding to the waste heat utilization project to adjust the gas supply of the mixing chamber to the waste heat utilization project.

[0017] Optionally, the S53 includes the following steps:

[0018] S5301. After entering the working period when the annealing kiln starts working, a waste heat utilization plan is matched, wherein the gas buffer chamber is provided with an exhaust valve and a plurality of mixing valves, and different mixing valves are respectively connected to the communicating vessels corresponding to different waste heat utilization projects;

[0019] S5302. Open and adjust the check valve, and control the exhaust valve to open and the mixing valve to close to inflate and ventilate the gas buffer chamber of the new annealing furnace;

[0020] S5303. Detect the temperature and pressure until the temperature and pressure in the gas buffer chamber meet the standards;

[0021] S5304. Gradually open the mixing valve and gradually close the exhaust valve, and control the power of the variable frequency traction fan and the opening of the check air valve according to the waste heat utilization plan.

[0022] Optionally, the S5 further includes the following steps:

[0023] S5311. After entering the working period of reducing the work of the annealing kiln, and matching the waste heat utilization plan;

[0024] S5312 detects temperature and pressure, and continues to inflate the gas buffer chamber of the annealing furnace exiting production to maintain the annealing furnace pressure stable;

[0025] S5313. Gradually close the mixing valve and gradually open the exhaust valve, and control the power of the variable frequency traction fan and the opening of the check air valve according to the waste heat utilization plan.

[0026] Optionally, the S5 further includes the following steps:

[0027] S5321. Obtain the planned waste heat demand in adjacent time periods to calculate the change in waste heat demand;

[0028] S5322. Based on the change in waste heat demand, find the gas buffer chamber combination that needs to be adjusted accordingly;

[0029] S5323. Select a gas buffer chamber from the lowest priority combination that leads to the waste heat utilization project that needs to be adjusted, and adjust the opening. At the same time, control the power of the variable frequency traction fan and the opening of the check air valve according to the waste heat utilization plan.

[0030] Optionally, the control of the power of the variable frequency traction fan and the opening of the check valve according to the waste heat utilization scheme includes the following steps:

[0031] Obtain the waste heat plan demand and waste heat demand change to generate the power change curve of the variable frequency traction fan;

[0032] The waste heat gas adjustment emission information corresponding to each gas buffer chamber, the current opening information of the check valve and the opening change curve of the mixing valve of the newly added or exited gas buffer chamber are obtained, and together with the power change curve of the variable frequency traction fan, they are input into the pre-trained machine model to obtain the opening adjustment control curve of each gas buffer chamber.

[0033] In the second aspect, the present application provides an annealing kiln waste heat recovery and utilization device, which adopts the following technical solution:

[0034] An annealing kiln waste heat recovery and utilization device, comprising:

[0035] The production status acquisition module is used to obtain the production batch status and production schedule of each annealing kiln;

[0036] The waste heat gas information query module is used to determine the waste heat gas standard emission information of the production batch corresponding to the annealing kiln; wherein the waste heat gas standard emission information includes waste heat gas emission flow information, waste heat gas emission temperature information and waste heat gas emission pressure information;

[0037] The waste heat gas information adjustment module is used to obtain the current ambient temperature and current ambient pressure information corresponding to the annealing kiln to adjust the waste heat gas emission information of the annealing kiln to obtain the waste heat gas adjustment emission information;

[0038] A waste heat demand calculation module is used to obtain the planned waste heat demand based on the current time and ambient temperature;

[0039] An adjustment module is formed to control the opening of the check valve of each gas buffer chamber and the power of the variable frequency traction fan corresponding to the waste heat utilization project based on the waste heat gas adjustment emission information and the planned demand for waste heat.

[0040] In a third aspect, the present application provides a computer device, which adopts the following technical solution:

[0041] A computer device comprising:

[0042] one or more processors;

[0043] Memory;

[0044] one or more application programs, wherein the one or more application programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs being configured to:

[0045] Execute the above-mentioned annealing kiln waste heat recovery method.

[0046] In a fourth aspect, the present application provides a computer-readable storage medium, which adopts the following technical solution:

[0047] A computer-readable storage medium stores a computer program that can be loaded by a processor and execute the above method.

[0048] The storage medium stores at least one instruction, at least one program, a code set or an instruction set, and the at least one instruction, the at least one program, the code set or the instruction set is loaded and executed by the processor to implement:

[0049] Such as the above-mentioned annealing kiln waste heat recovery and utilization method.

[0050] In summary, the present application includes at least one of the following beneficial technical effects:

[0051] 1. This solution achieves the optimal allocation of waste heat resources by obtaining waste heat planning requirements and emission adjustment information in real time and dynamically allocating gas resources in the buffer room based on priority. Waste heat gas in different temperature zones is accurately allocated to projects with corresponding requirements, which improves the utilization efficiency of waste heat and avoids resource waste, especially ensuring the supply of key projects during high-demand periods, ensuring the overall energy efficiency of the system is maximized.

[0052] 2. This solution achieves a smooth transition of flow and pressure between the gas buffer chamber and the waste heat project by generating the fan power change curve, the check valve and the mixing valve opening change curve. The dynamic adjustment of the check valve reduces the pressure fluctuation caused by the connection between the buffer chamber and the communicating vessel, ensures the stability of the waste heat supply, and reduces the impact of the imbalance of system temperature and pressure on the annealing kiln and waste heat utilization project.

[0053] 3. The pre-trained machine model generates the optimal control curve based on historical data and real-time operating condition changes, ensuring that the waste heat system can be adjusted in real time according to the external temperature, demand fluctuations and equipment operating status. Through the closed-loop feedback mechanism of the control strategy, the system has the ability to automatically optimize operation under dynamic demand, thereby achieving a stable and efficient waste heat recovery process, reducing the fluctuation of waste heat gas during the flow process, and improving the reliability and operation stability of the overall system. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 A system block diagram of an annealing furnace waste heat recovery system capable of recovering waste heat in one embodiment of the present invention is shown.

[0055] Figure 2 A flowchart of a method for recovering waste heat from an annealing furnace executed by a control device in one embodiment of the present invention is shown.

[0056] Figure 3 A flowchart of sub-step S5 in one embodiment of the present invention is shown.

[0057] Figure 4 A schematic diagram of a computer device according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0058] The present application is further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0059] In the following description, for the purpose of explanation, many specific details are set forth in order to provide a thorough understanding of the inventive concept. As part of this specification, some of the drawings in the drawings of the present disclosure represent structures and devices in the form of block diagrams to avoid making the disclosed principles complicated and difficult to understand. For the sake of clarity, not all features of the actual implementation are necessary to be described. In addition, the language used in this disclosure has been selected primarily for readability and instructional purposes, and may not be selected to delineate or limit the subject matter of the present invention, thereby resorting to the necessary claims to determine such inventive subject matter. References to "a specific implementation" or "specific implementations" in this disclosure mean that the specific features, structures or characteristics described in conjunction with the specific implementation are included in at least one specific implementation, and multiple references to "a specific implementation" or "specific implementations" should not be understood as necessarily referring to the same specific implementation.

[0060] Unless expressly limited, the terms "a", "an", and "the" are not intended to refer to a singular entity, but rather to include general categories of which specific examples may be used for illustration. Thus, the use of the terms "a" or "an" may mean any number of at least one, including "one", "one or more", "at least one", and "one or more than one". The term "or" means any of the alternatives and any combination of the alternatives, including all alternatives, unless the alternatives are expressly indicated to be mutually exclusive. The phrase "at least one of" when combined with a list of items refers to a single item in the list or any combination of the items in the list. The phrase does not require all of the listed items unless expressly limited to that.

[0061] Reference Figure 1 , the embodiment of the present application discloses an annealing furnace waste heat recovery system capable of recovering waste heat, and the annealing furnace includes an annealing furnace working area, a gas buffer chamber, a connecting vessel and a control device. The annealing furnace working areas are respectively A area, B1 area, B2 area and C area. The thermal principle of the annealing furnace working area is radiation heat exchange, and each area is provided with an air cooling system. Heat exchangers are installed in the space above and below the glass belt. The glass belt radiates heat to the heat exchanger. The heat exchanger contains room temperature cold air, which runs in the opposite direction of the glass belt. The temperatures of the annealing furnace are about 540℃, 470℃, 300℃ and 210℃ in areas A, B1, B2 and C, respectively.

[0062] Table 1 Waste heat power of each zone of annealing furnace annealing section

[0063]

[0064] The working area of ​​the annealing furnace is connected to the gas buffer chamber through a check valve. Since the annealing furnace is very sensitive to temperature, once the system in the annealing furnace is disturbed, the control will be unstable, and the temperature of the annealing furnace will fluctuate, which will have an immeasurable impact on the quality and output of glass. Therefore, the use of a check valve to connect the gas buffer chamber and the working area of ​​the annealing furnace can avoid the phenomenon of gas backflow caused by the pressure change in the gas buffer chamber. The check valve adjusts the gas flow rate by adjusting its own opening, thereby reducing the impact of external pressure and temperature fluctuations on the annealing furnace. At the same time, the gas buffer chamber has a large volume, which can play a certain role in buffering when exhausting, avoiding the direct transmission of gas flow changes, pressure changes and temperature changes to the annealing furnace.

[0065] The gas buffer chamber is provided with an exhaust valve and several mixing valves, and different mixing valves are respectively connected to the communicating vessels corresponding to different waste heat utilization projects. The gases in different gas buffer chambers are mixed in the communicating vessels after passing through the mixing valves, and then enter the variable frequency traction fan, which pumps the mixed waste heat gas into the waste heat utilization device. The exhaust valve is used to discharge the waste heat gas in the gas buffer chamber to the outside, and can be used to balance or maintain the pressure in the gas buffer chamber. The control device is used to determine the waste heat gas emission information of the annealing furnace according to the production plan and actual production situation, and then combine the gas buffer chamber by opening and closing the mixing valve, and control the power of the variable frequency traction fan to control the waste heat gas flowing into the communicating vessel to enter the waste heat utilization device. The starting state and the end state in this change process are determined and balanced, but due to the influence of multiple factors, the gas pressure in the gas buffer chamber will be affected by various switching actions during this period. It is difficult to find a curve that perfectly matches the opening of each valve and the power change of the variable frequency traction fan to avoid affecting the temperature in the annealing furnace. Therefore, the control device adjusts the opening of the check air valve during this period to reduce the impact on the temperature in the annealing kiln.

[0066] Specifically, refer to Figure 2 The embodiment of the present application discloses a method for recovering waste heat from an annealing furnace for execution by a control device, comprising the following steps S1-S5.

[0067] S1. Obtain the production batch status and production schedule of each annealing kiln.

[0068] At present, the factory buildings of float glass production lines generally adopt steel structures, and most of the walls and roofs of the factory buildings use single-layer color steel tiles. In the winter in the north, the lowest outdoor temperature reaches minus 10℃, and the insulation effect of color steel tiles is extremely poor, and the temperature indoors and outdoors is almost the same. The production of wide-plate ultra-thin float glass has extremely stringent requirements on the environment and equipment. When the width of the original glass plate is 5.2m, the ambient temperature has a greater impact on the quality of the glass plate. When the ambient temperature is low, the glass plate is prone to bending, cracking, poor cutting edge quality, and the number of angles of the edge breaking. The annealing furnace is one of the three major thermal equipment in the float glass production line. The temperature of the continuous glass strip drawn from the tin bath is about 600℃. It enters the annealing furnace through the transition roller table and is properly cooled by the annealing furnace. The temperature of the glass plate at the outlet of the sealing area of ​​the annealing furnace is about 290℃. In actual production, different types of glass have different production temperatures and annealing temperatures, and different production batches require different glass outputs in the sound field. Therefore, the temperature and working hours of the annealing furnace are different every day. There are multiple glass production lines in the factory. The temperature influence of adjacent annealing kilns is not obvious. During production, the work of the annealing kilns needs to be scheduled according to actual production needs, in order to calculate the actual emission of waste heat gas from each annealing kiln at each time point and plan the gas waste heat utilization plan.

[0069] As an example, a day may be divided into a single time period after a number of equal-length time periods as working time periods, and a number of working time periods of an annealing kiln may be selected as the production schedule for a production batch.

[0070] S2. Determine the standard emission information of waste heat gas corresponding to the production batch of the annealing kiln; wherein the standard emission information of waste heat gas includes waste heat gas emission flow information, waste heat gas emission temperature information and waste heat gas emission pressure information.

[0071] In the production process of float glass, different glass types (such as thickness, composition, use, etc.) have different requirements for annealing temperature and cooling rate, which directly affects the emission of waste heat gas in the annealing furnace. For example, ultra-thin glass has more precise control over the cooling process and usually requires higher temperature balance; while thick plate glass or tempered glass tends to emit higher temperature waste heat gas during the annealing process.

[0072] For example, during the annealing process, for the production of 5.2-meter-wide ultra-thin float glass (such as high-transmittance glass for displays), the temperature may be required to be controlled in a lower range to prevent cracking and maintain a uniform temperature; at this time, the exhaust waste heat gas temperature is low. For architectural thick plate glass, its tolerance temperature and thermal stability requirements are higher, so it can withstand higher waste heat temperatures and the exhaust gas temperature is also higher.

[0073] In this step, measuring the waste heat gas emission information at standard temperature (usually 20°C) and standard air pressure (such as 101.325kPa) can eliminate the impact of environmental changes on the measurement results, making the emission information comparable under different conditions. Due to the large differences in temperature and air pressure inside and outside the factory, especially the heat exchange system in float glass production is very sensitive to temperature changes, the actual waste heat gas emissions may change at different temperatures and air pressures. In order to ensure the accuracy of the emission data, the emission data will be adjusted according to the actual temperature and air pressure conditions of the production environment to ensure the effectiveness and stability of the waste heat recovery system under different environmental conditions.

[0074] It should be noted that the temperature, flow rate and pressure of waste heat gas will change during the discharge and flow process due to the path, wind direction and other dynamic factors. Therefore, if you rely directly on real-time measurement data, the results may not be accurate. The predicted data is based on standard emission information and adjusted to take into account dynamic flow characteristics, which is a more reliable basis.

[0075] The float glass production process requires precise control of the temperature fluctuations of the annealing kiln. Therefore, before the emission information changes, the system needs to adjust the power and valve opening of the waste heat recovery equipment in advance to avoid the impact of sudden temperature fluctuations on the glass quality. If only relying on real-time measurement, it may cause a lag in temperature or pressure changes, resulting in adverse effects such as unstable glass quality. Therefore, by predicting the emission of waste heat gas, the system can make corresponding controls in advance to ensure production stability.

[0076] The waste heat gas discharge flow information refers to the volume or mass flow of the waste heat gas discharged from the annealing kiln within a certain period of time. The waste heat gas discharge temperature information refers to the temperature of the discharged waste heat gas. The waste heat gas discharge pressure information refers to the gas pressure of the waste heat gas at the moment of discharge, which directly affects the flow rate of the gas in the pipeline and the stability of the mixing process. Appropriate pressure control can ensure that the waste heat gas is evenly distributed in the buffer chamber to avoid the gas flow rate being too fast or too slow, which affects the waste heat recovery effect. The pressure information also determines the opening adjustment strategy of the exhaust valve and the mixing valve to achieve a balance in the utilization of waste heat in different areas.

[0077] S3. Obtain the current ambient temperature and current ambient pressure information corresponding to the annealing kiln to adjust the waste heat gas emission information of the annealing kiln to obtain the waste heat gas adjustment emission information.

[0078] The current ambient temperature and pressure information obtained in this step is the actual data of the specific location in the plant where the annealing kiln is located. This is because the distribution locations of the annealing kilns in the plant are different, resulting in differences in air pressure and temperature. For example, the annealing kiln close to the door or the outer wall may be affected by greater external temperature and air pressure, while the annealing kiln near the center of the plant is relatively stable. The temperature difference directly affects the heat dissipation efficiency of the annealing kiln, thereby changing the exhaust temperature and flow rate of the waste heat gas.

[0079] In northern regions, the indoor and outdoor temperature difference is significant in winter, and the plant temperature may be much lower than the standard temperature, making the gas cooling effect stronger, while the higher temperature in summer may lead to a weakened cooling effect. Therefore, in summer and winter, it is necessary to dynamically adjust the waste heat gas emission information according to real-time environmental conditions to ensure that the waste heat recovery system can operate efficiently in different seasons. Similarly, the temperature difference between day and night will also have a similar impact.

[0080] As an example, ambient temperature, air pressure information, and waste heat gas emission information are input into a pre-trained machine model. The machine model has been trained based on historical data from different seasons and can automatically adjust emission information to suit current environmental conditions. The historical data input into the model includes environmental variables such as temperature and air pressure and their impact on waste heat emission temperature, pressure, flow, and other indicators, thereby helping the model generate emission information that is adapted to different seasons and environments.

[0081] For example, the input layer of the model receives three sets of data, namely the current temperature, air pressure and standard waste heat gas emission information. The machine model uses historical data from various seasons during training, which helps the model identify the influence of ambient temperature and air pressure on gas emission temperature, flow rate and pressure. For example, when the ambient temperature is low in winter, the model will lower the expected emission temperature based on the impact of low temperature on the cooling effect of waste heat gas; while under high temperature conditions in summer, the model will increase the standard value of waste heat emission temperature. The core of the machine model is to predict the adjusted waste heat gas emission information and optimize the control parameters in advance before the temperature or air pressure changes. The output layer of the model generates the adjusted emission flow rate, temperature and pressure information to ensure that the system can adjust the valve opening and fan power in advance to maintain the stability of waste heat recovery. In terms of air pressure adjustment, the machine model ensures that the system's air pressure balance is within a reasonable range. Air pressure information is a key factor in the uniformity of mixed gas and the efficiency of waste heat recovery. The adjustment of the model ensures that the flow of gas in the buffer chamber, connecting vessel and fan will not be excessively affected by environmental fluctuations.

[0082] S4. Based on the current time and ambient temperature, obtain the planned demand for waste heat.

[0083] The demand for waste heat varies significantly on different days and time periods. For example, heating demand is higher during the day in winter than at night because higher temperatures are needed for employees and equipment during the day; during the day in summer, factories may need more electricity to run air conditioning and refrigeration equipment, so the demand for steam power generation increases. Electricity demand is usually lower in the evening in summer than during the day, especially on cool nights.

[0084] In some extreme weather conditions (such as hot summer or severe winter), the demand for waste heat changes more significantly. For example, the demand for electricity is higher on hot summer nights because the demand for electricity increases when the air conditioner is running at high load. The demand for heating increases on cold winter nights, especially when the factory or equipment needs to maintain temperature for a long time, which puts higher demands on the waste heat demand of the heating device.

[0085] There are many types of waste heat utilization projects, such as waste heat power generation devices, waste heat water circuit heating devices, waste heat heating devices or waste heat combustion-supporting devices.

[0086] The waste heat steam power generation device converts high-temperature waste heat gas into steam to drive the generator set to generate electricity. The high-temperature gas passes through the heat exchange device in the steam generator, transfers heat energy to water, and the generated high-pressure steam drives the turbine to generate electricity. This device is suitable for production peaks that require a large amount of electricity, especially when the temperature is high (such as during the day in summer), and the waste heat can be converted into electricity to the maximum extent.

[0087] The waste heat exchange water circuit heating device uses waste heat gas to heat cold water and provide constant temperature hot water for the factory or production line through the circulating water system. It is suitable for industrial processes or heating systems that require water temperature. The device transfers waste heat to the water circuit through the heat exchanger to produce stable hot water. This equipment has a higher demand in low temperature environments (such as winter) to ensure constant water temperature.

[0088] The waste heat heating device directly uses waste heat to heat the factory or living area. This system introduces waste heat into the heating pipes or radiation panels, and provides heat sources in the form of hot air, hot water, etc. It is in high demand in the cold winter and can significantly reduce the impact of low temperatures on the factory temperature, ensuring that the temperature of the factory production and living areas is suitable.

[0089] The waste heat combustion device introduces waste heat gas into the combustion system to preheat the fuel and air to improve the combustion efficiency. This device is often used in industrial combustion processes that require a high temperature environment (such as high-temperature furnaces for glass and ceramics, etc.). Before the fuel enters the combustion chamber, the waste heat is used to increase the initial temperature of the fuel, reducing fuel consumption and energy requirements of the combustion process.

[0090] In order to achieve waste heat demand forecasting for different dates and time periods, the current time and ambient temperature information are input into the pre-trained machine model. Through these input features, the machine model can identify the demand changes of each waste heat utilization project under current conditions.

[0091] The machine model uses different time, temperature and waste heat demand data as training sets to learn the waste heat demand characteristics under different conditions. For example, the power demand data during the high temperature period in summer and the heating demand data during the low temperature period in winter are used as training data to help the model identify the relationship between temperature, time and waste heat utilization projects.

[0092] After receiving the current environmental data, the model calculates the demand in advance through historical trends and real-time input time and temperature, and distributes the demand to each waste heat utilization project. This ensures that before the peak demand arrives, the system has adjusted the waste heat distribution and adjusted the fan power, valve opening and other equipment operating parameters in advance.

[0093] S5. Based on the waste heat gas adjustment emission information and the planned demand for waste heat, the opening of the check valve of each gas buffer chamber and the power of the variable frequency traction fan corresponding to the waste heat utilization project are controlled.

[0094] In this step, the gas flow rate of each buffer room and the air intake power of each waste heat utilization project are adjusted according to the real-time data of waste heat gas emission and the predicted demand. By controlling the opening of the check valve and the fan power of the gas buffer room, the waste heat distribution of the system changes synchronously with the demand, thereby optimizing the resource utilization efficiency of each project.

[0095] This step uses the "adjusted emission information" and "waste heat planned demand situation" of waste heat gas as the basis for adjustment. The former is the gas emission data adjusted according to the actual ambient temperature and air pressure, and the latter is the demand predicted based on time and ambient temperature. Combining these two sets of data, real-time adjustment of each buffer room is achieved.

[0096] Specifically, the waste heat gas adjustment emission information includes real-time adjustment data of emission flow, temperature, and pressure. These data help the system understand the current waste heat resource situation through actual feedback of the current ambient temperature and air pressure. For example, when the temperature is high or the air pressure is low, the emission gas flow or temperature may deviate from the standard value, and the system makes adjustments in advance based on this information. At the same time, the adjusted waste heat gas information provides accurate opening data for the check valve of the buffer chamber to ensure the stability of the gas flow.

[0097] The waste heat planning demand is the real-time demand data predicted by the machine model based on the current time and ambient temperature, which determines the priority and demand of each waste heat project. By predicting demand fluctuations in the future period, the system can complete the pre-adjustment of valves and fans before the actual demand arrives.

[0098] Different waste heat utilization projects may have different priorities during peak and low demand periods. The system dynamically allocates gas supply to the buffer room based on demand, maintaining a stable waste heat flow on higher priority projects and reducing unnecessary resource consumption during low demand periods.

[0099] The control of the check valve opening is mainly based on the real-time air pressure and flow data of the gas buffer chamber. The valve opening controls the airflow in and out of the buffer chamber to achieve stable air pressure and airflow speed. The fan power and the check valve opening control need to be closely coordinated. The suction of the fan introduces the gas in the buffer chamber into the waste heat utilization project through the valve, while the valve opening control determines the air flow entering the fan. The coordinated regulation of the two keeps the gas flow rate and pressure within a reasonable range under different demand conditions.

[0100] Specifically, refer to Figure 3 , S5 includes the following steps S51-S53.

[0101] S51. Based on the current temperature and time, the waste heat plan demand is matched.

[0102] In this step, the current temperature and time information are matched with the waste heat plan demand to ensure that the system can flexibly adjust the resource allocation of each waste heat utilization project according to the actual situation. It should be noted that the waste heat plan demand varies in different time periods and will change. At the same time, the waste heat supply will also change. Therefore, in the subsequent steps, the combination of the check valve and the gas buffer chamber needs to be dynamically adjusted when the waste heat demand and waste heat supply change at the same time.

[0103] It should be noted that this application also includes setting priorities for different projects to achieve a reasonable allocation of resources. For example, under severe cold conditions in winter, the heating project has the highest priority, and the steam power generation project has the second highest priority; in summer, steam power generation has a higher priority to ensure the power needs of the plant cooling system and production equipment. According to the matched needs, the system will prioritize resources to waste heat projects with currently higher demand to ensure that these projects have sufficient waste heat resources during operation. The allocation strategy formed by priority setting and demand calculation provides a clear direction for resource allocation for subsequent steps, achieves optimal allocation within limited waste heat resources, and avoids ineffective consumption of resources.

[0104] An embodiment of the algorithm for allocating waste heat resources:

[0105] Input variables:

[0106] Total waste heat resources (Q): The amount of waste heat gas currently available for allocation (such as flow or heat).

[0107] The demand for each item (D i ): The demand for different waste heat utilization projects in the current period.

[0108] The priority weight of each project (P i ): Indicates the priority of the project, which can generally be set based on factors such as season and time period.

[0109] Output variables:

[0110] The amount of allocation each project receives (Q i ): The actual amount of waste heat resources allocated to each project.

[0111] Algorithm steps:

[0112] Step 1: Calculate demand weights

[0113] Calculate the demand share for each project:

[0114]

[0115] Among them, W i represents the demand weight of item i.

[0116] Step 2: Calculate priority weights

[0117] Set weight P according to priority i , the weight value can be dynamically adjusted based on the demand and importance of the project. For example, in winter, heating can have a higher priority; in summer, steam generation can have a higher priority.

[0118] Step 3: Calculate the comprehensive allocation weight

[0119] Combine the demand weight and priority weight to get the comprehensive allocation weight of each project (A i ), which is usually calculated as follows:

[0120] A i =W i ×P i

[0121] Among them, the comprehensive weight A i Represents the priority of item i in the allocation.

[0122] Step 4: Calculate the allocation ratio

[0123] Normalize the comprehensive allocation weight of each project to ensure that the total amount of resource allocation is equal to the total amount of waste heat Q:

[0124]

[0125] Among them, R iis the allocation ratio of project i.

[0126] Step 5: Calculate the actual amount allocated

[0127] According to the total amount of waste heat resources Q and the allocation ratio R i , calculate the actual allocation Q of each project i :

[0128] Q i =R i ×Q

[0129] S52. According to the waste heat plan, the mixing chambers are allocated to different waste heat utilization projects, wherein one waste heat utilization project corresponds to a group of mixing chambers.

[0130] In this step, waste heat gas is distributed from the gas buffer room to different waste heat utilization projects according to the waste heat demand plan. By dynamically controlling the mixing valves and connecting pipes of multiple buffer rooms, it is ensured that each waste heat project obtains appropriate gas supply within the required time and demand range.

[0131] The waste heat demand plan provides specific demand and priority for the allocation process, guiding the system to allocate the gas in the buffer chamber to different projects such as steam power generation, heating, heat exchange heating or combustion support as needed in different time periods. It should be noted that the annealing furnace is generally divided into multiple temperature zones, such as Zone A, Zone B1, Zone B2 and Zone C, with temperatures gradually decreasing from 540°C, 470°C, 300°C to 210°C. The waste heat gas in each temperature zone has different characteristics. The high temperature zone is suitable for providing waste heat with high calorific value, while the low temperature zone is suitable for projects with low temperature requirements. High temperature gas is usually used first for projects with high calorific value requirements, such as steam power generation or combustion support devices; medium temperature zone gas can be used for heating systems; and low temperature gas is suitable for general heat exchange heating devices. Therefore, when allocating waste heat gases of different temperatures, the required temperature of the project should be given priority to achieve the best match.

[0132] Each gas buffer chamber is connected to the annealing kiln working area through a check valve to form a relatively independent gas collection space. Since the gas temperature, flow rate and pressure of each buffer chamber may be different, in the subsequent steps, when distributing waste heat, the system needs to reasonably distribute these gas parameters. Each buffer chamber is connected to different waste heat projects through mixing valves and connecting pipes, and the mixing valves from each buffer chamber to the project are opened or closed according to current needs, and the gas supply route is adjusted to ensure that the gas flow direction and flow meet the requirements of each project. However, since the communicating vessel connects multiple buffer chambers, when the air pressure fluctuates in a single gas buffer chamber or the power of the variable frequency traction fan fluctuates, it will affect other buffer chambers. Therefore, adaptive adjustments are required in the subsequent steps.

[0133] S53. Based on the waste heat gas adjustment emission information and the planned demand for waste heat, adjust the opening of the check valve of each gas buffer chamber and the power of the variable frequency traction fan corresponding to the waste heat utilization project to adjust the gas supply of the mixing chamber to the waste heat utilization project.

[0134] In the previous steps, by adjusting the opening of the mixing valves of different buffer chambers, the flow direction of the waste heat gas is dynamically adjusted during high-demand or low-demand periods according to the priority of the waste heat utilization project. When the demand of the high-priority project increases, the gas buffer chamber of the low-priority project is connected to the connecting vessel of the high-priority project, so that more waste heat resources are preferentially allocated to the high-demand project.

[0135] In this step, since the newly added buffer chamber is connected to the connecting vessel of the high-demand project, the gas flow and pressure will fluctuate during the connection process, which may have an adverse effect on the stability of the system. Therefore, the adjustment of the check valve becomes a key means to buffer the fluctuation. The check valve can control the flow in the buffer chamber, gradually balance the air pressure, and avoid the impact of the sudden increase in flow on the mixing chamber and the supply of each project.

[0136] After the mixing valve between the low-priority buffer chamber and the high-priority connector is opened, the check valve adjusts the opening to smooth out the pressure fluctuation. Specifically, the check valve opening will be adjusted slightly at the beginning of the mixing valve opening to gradually release the gas in the buffer chamber, ensuring a smooth transition of the airflow to the high-priority connector to avoid sudden pressure shocks.

[0137] On the basis of the adjustment of the check valve, the power of the variable frequency traction fan is also adjusted synchronously according to the demand fluctuation. For example, when the demand of high-priority projects increases, the fan power increases accordingly to adapt to the additional gas flow from the buffer chamber to the connecting vessel; during low-demand periods, the fan power is moderately reduced to maintain a stable supply for low-priority projects. When the mixing valve is connected to the newly added buffer chamber, the opening adjustment of the check valve ensures a smooth inflow of airflow, and the fan gradually increases the power after the pressure is balanced to further stabilize the flow.

[0138] For example, when entering a new working period and adding an annealing kiln to start working in this working period, the new working period S53 can execute the following steps S5301-S5304.

[0139] S5301. After entering the working period when the annealing kiln is added to start working, the waste heat utilization plan is matched, wherein the gas buffer chamber is provided with an exhaust valve and a plurality of mixing valves, and different mixing valves are respectively connected to the communicating vessels corresponding to different waste heat utilization projects.

[0140] In this step, a high-priority waste heat utilization scheme is enabled during high-demand periods to match the waste heat project with the highest current demand, and the connection strategy for the gas buffer room is determined.

[0141] S5302. Open and adjust the check air valve, and control the exhaust valve to open and the mixing valve to close to inflate and ventilate the gas buffer chamber of the new annealing kiln.

[0142] S5303. Check the temperature and air pressure until the temperature and air pressure in the gas chamber meet the standards.

[0143] In both steps, the gas conditions are matched to the needs of the high-priority projects. This preparation step is intended to avoid flow or temperature fluctuations caused by mismatched buffer chamber gases.

[0144] S5304. Gradually open the mixing valve and gradually close the exhaust valve, and control the power of the variable frequency traction fan and the opening of the check air valve according to the waste heat utilization plan.

[0145] In this step, the mixing valves between the buffer chamber and the connecting vessel are gradually opened, and the drain valve is closed to ensure that the newly added buffer chamber is stably connected to the high-priority project. At the same time, the fan power and the opening of the check valve are controlled to smooth out the fluctuations in air pressure and flow.

[0146] In contrast, when entering a new working period and there is a plan to end the work of the annealing kiln in this working period, S5 can also perform the following steps S5311-S5313.

[0147] S5311. After entering the working period of reducing the work of the annealing kiln, match the waste heat utilization plan.

[0148] S5312. Detect the temperature and air pressure, and continue to inflate the gas buffer chamber of the annealing furnace that has exited production to maintain the air pressure of the annealing furnace stable.

[0149] S5313. Gradually close the mixing valve and gradually open the exhaust valve, and control the power of the variable frequency traction fan and the opening of the check air valve according to the waste heat utilization plan.

[0150] When the waste heat planning demand changes, S5 may also perform the following steps S5321-S5323.

[0151] S5321. Obtain the planned waste heat demand in adjacent time periods to calculate the change in waste heat demand.

[0152] S5322. Based on the change in waste heat demand, find the gas buffer chamber combination that needs to be adjusted accordingly.

[0153] S5323. Select a gas buffer chamber from the lowest priority combination that leads to the waste heat utilization project that needs to be adjusted, and adjust the opening. At the same time, control the power of the variable frequency traction fan and the opening of the check air valve according to the waste heat utilization plan.

[0154] Specifically, the above-mentioned method of controlling the power of the variable frequency traction fan and the opening of the check valve according to the waste heat utilization scheme includes the following steps ab:

[0155] a. Obtain the planned waste heat demand and waste heat demand changes to generate the power change curve of the variable frequency traction fan.

[0156] b. Obtain the waste heat gas adjustment emission information corresponding to each gas buffer chamber, the current opening information of the check valve and the opening change curve of the mixing valve of the newly added or exited gas buffer chamber, and input them together with the power change curve of the variable frequency traction fan into the pre-trained machine model to obtain the opening adjustment control curve of each gas buffer chamber.

[0157] First, the current waste heat demand plan and waste heat demand change are obtained. These two sets of data determine the system output state and power demand changes, and the impact of environmental factors (such as temperature and air pressure) on the system output is comprehensively considered.

[0158] Generation of power change curve: Generate the power change curve of the variable frequency traction fan based on the demand situation, so as to accurately control the power output of the fan in different demand periods. For example, generate an upward power curve in high demand period to ensure that the fan output matches the waste heat demand, and generate a downward power curve in low demand period to save energy and keep the system stable.

[0159] Control logic at the output end: The power change curve is used as the basis for the output control of the system, enabling the system to adjust the output power of the fan in real time to adapt to the fluctuation of waste heat demand. This curve directly affects the suction and flow control of the fan on the waste heat gas, thereby meeting the different requirements of various projects for waste heat gas.

[0160] Obtain input information: In this step, the system obtains the waste heat gas adjustment emission information and the current status of each gas buffer chamber, including the opening information of the check valve and the opening change curve of the mixing valve newly added or exited from the buffer chamber. As the input status information of the system, these data have taken into account the impact of environmental factors on the gas emission characteristics of the buffer chamber.

[0161] Control basis of buffer chamber status: The discharge information (temperature, flow, pressure) at the input end provides the current status benchmark for the system to control valves and fans. Through this information, the system can understand the waste heat gas status of each buffer chamber in real time, so as to accurately adjust the fan power and valve opening.

[0162] When the gas in different buffer chambers enters the communicating vessel through the mixing valve, the gas temperature and pressure gradually tend to balance. The opening change curve of the mixing valve must correspond to the power change curve of the variable frequency traction fan to ensure the controllability of the gas flow and temperature changes. The opening curve of the mixing valve is designed according to the fan power change curve so that the gas flow and pressure are adjusted synchronously when the power changes. Due to different external pressures, the mixing valve and the exhaust valve follow a specific change curve when they are opened. This curve design ensures that the gas is buffered, mixed, and forms a stable temperature and pressure change before entering the fan, avoiding system instability caused by airflow fluctuations.

[0163] The above-obtained waste heat gas adjustment emission information, the current opening of the check valve, the opening change curve of the mixing valve, and the fan power change curve are input into the pre-trained machine model. The model uses these data to output the check valve opening adjustment control curve of each gas buffer chamber to meet the flow and temperature requirements of different waste heat projects.

[0164] It should be noted that the loss function of the model is specifically designed to minimize the fluctuation of the adjustment emission information of the waste heat gas while meeting the waste heat demand. The control curve generated by the model based on the input data must strictly correspond to each time point to ensure that the changes of the check valve, fan power and mixing valve are executed synchronously.

[0165] As an example, the machine model for controlling the power of the variable frequency traction fan, the opening of the check valve and the opening of the mixing valve to ensure the smooth operation of the waste heat system under dynamic demand is given here.

[0166] The input data required by the machine model include:

[0167] Waste heat plan demand: The waste heat demand of the system at different times, usually including the waste heat demand of heating, steam power generation, heat exchange heating, combustion support and other projects. These demand data can be collected at different peak and trough periods.

[0168] Waste heat demand changes: Demand change trends calculated based on historical demand and changes in environmental conditions. Daily, monthly, seasonal and other factors are taken into account.

[0169] Waste heat gas adjustment emission information: The actual temperature, flow rate and pressure changes of the waste heat gas reflect the impact of environmental factors on emissions.

[0170] Current buffer chamber status: including the opening of the check valve of each gas buffer chamber, the opening of the mixing valve, and the current fan power.

[0171] The status of newly added or exited buffer chamber: including the mixing valve opening, gas temperature, and gas pressure change curve after the buffer chamber is added or exited.

[0172] Target output: opening control curve of the check air valve of each gas buffer chamber.

[0173] Reference output: generated fan power variation curve and mixing valve opening variation curve.

[0174] The model structure of the machine model is a deep neural network (such as an LSTM network), including an input layer, a hidden layer, and an output layer.

[0175] Input layer: Multiple input nodes correspond to input data such as waste heat demand, emission information, current buffer room and valve status, and newly added or exited buffer room status.

[0176] The hidden layers include LSTM layers and fully connected layers.

[0177] LSTM layer: used to process time series information and can learn the dependency between historical demand and control variables.

[0178] Fully connected layers: The output of the LSTM layer is followed by several fully connected layers to further extract features and generate output.

[0179] Output layer: The model outputs three curves: the power change curve of the variable frequency traction fan, the opening curve of the check valve, and the opening change curve of the mixing valve.

[0180] The core of this model is to minimize the fluctuation of waste heat gas adjustment emission information while meeting the needs of various waste heat projects. Therefore, the designed loss function consists of two parts:

[0181] Steady loss: used to minimize the fluctuation of the waste heat gas adjustment emission information. Assuming that the emission information includes temperature T, flow F, and pressure P, the steady loss can be defined as:

[0182]

[0183] Where α is the weight parameter of the stationary loss, and Δ represents the change of the variable at time point t.

[0184] Demand matching loss: used to minimize the deviation between actual output and demand, ensuring that the generated power and valve opening meet the demand. If D is the demand curve and Q is the model output curve, the demand matching loss can be defined as:

[0185]

[0186] Among them, β is the weight of demand loss.

[0187] Comprehensive loss function:

[0188] L 总 =L平稳 +L 需求

[0189] By adjusting the weights of α and β, the optimal balance between stability and demand matching can be found.

[0190] The model can be trained through the following steps AG to obtain a machine model for controlling the power of the variable frequency traction fan, the opening of the check air valve and the opening of the mixing valve to ensure the smooth operation of the waste heat system under dynamic demand.

[0191] A. Divide the dataset into training set, validation set and test set.

[0192] B. Use Adam optimizer.

[0193] C. Use mini-batch stochastic gradient descent (mini-batch SGD). Each batch contains data from consecutive time periods, which makes it easier for the model to capture temporal dependencies.

[0194] D. Add Dropout regularization to the hidden layer to prevent overfitting.

[0195] E. During the training process, the stability and demand matching ability of the model are monitored through the validation set to evaluate the effect of the model.

[0196] F. Adjust the model’s hyperparameters (such as the number of LSTM layers, the number of hidden layer nodes, loss weight parameters, etc.) to minimize the comprehensive loss function of the validation set.

[0197] G. The k-fold cross-validation method was used to further evaluate the model.

[0198] The trained model is used to control the waste heat system in real time. The model will input the status information and demand data of each buffer chamber and valve in real time, and output the corresponding control curve.

[0199] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0200] In one embodiment, an annealing furnace waste heat recovery device is provided, and the annealing furnace waste heat recovery device corresponds to the annealing furnace waste heat recovery device method in the above embodiment. The annealing furnace waste heat recovery device includes a production status acquisition module, a waste heat gas information query module, a waste heat gas information adjustment module, a waste heat demand calculation module and a component adjustment module. The functional modules are described in detail as follows:

[0201] The production status acquisition module is used to obtain the production batch status and production schedule of each annealing kiln;

[0202] The waste heat gas information query module is used to determine the waste heat gas standard emission information of the production batch corresponding to the annealing kiln; wherein the waste heat gas standard emission information includes waste heat gas emission flow information, waste heat gas emission temperature information and waste heat gas emission pressure information;

[0203] The waste heat gas information adjustment module is used to obtain the current ambient temperature and current ambient pressure information corresponding to the annealing kiln to adjust the waste heat gas emission information of the annealing kiln to obtain the waste heat gas adjustment emission information;

[0204] A waste heat demand calculation module is used to obtain the planned waste heat demand based on the current time and ambient temperature;

[0205] An adjustment module is formed to control the opening of the check valve of each gas buffer chamber and the power of the variable frequency traction fan corresponding to the waste heat utilization project based on the waste heat gas adjustment emission information and the planned demand for waste heat.

[0206] For the specific definition of the annealing kiln waste heat recovery and utilization device, please refer to the definition of the annealing kiln waste heat recovery and utilization method above, which will not be repeated here. Each module in the above-mentioned annealing kiln waste heat recovery and utilization device can be implemented in whole or in part by software, hardware and their combination. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0207] In one embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as follows: Figure 4 As shown. The computer device includes a processor, a memory, a network interface and a database connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used for data related to the annealing furnace waste heat recovery method. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a method for recovering and utilizing waste heat from an annealing furnace is implemented.

[0208] In one embodiment, a computer device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the above-mentioned embodiment of the annealing furnace waste heat recovery method when executing the computer program. Alternatively, the processor implements the functions of each module / unit of the annealing furnace waste heat recovery device in the above-mentioned embodiment when executing the computer program. To avoid repetition, it will not be repeated here.

[0209] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the method for recovering waste heat from an annealing kiln in the above embodiment is implemented. Alternatively, when the computer program is executed by a processor, the functions of each module / unit in the device for recovering waste heat from an annealing kiln in the above device embodiment are implemented. To avoid repetition, it will not be described here.

[0210] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments of the present application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0211] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0212] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention.

Claims

1. A method for recovering waste heat from an annealing kiln, characterized in that: The following steps are involved: S1. Obtain the production batch information and production schedule of each annealing kiln; S2. Determine the standard emission information of waste heat gas corresponding to the production batch of the annealing kiln; wherein the standard emission information of waste heat gas includes waste heat gas emission flow information, waste heat gas emission temperature information and waste heat gas emission pressure information; S3. Obtain the current ambient temperature and current ambient pressure information corresponding to the annealing kiln to adjust the waste heat gas emission information of the annealing kiln to obtain the waste heat gas emission adjustment information; S4. Based on the current time and ambient temperature, obtain the planned demand for waste heat; S5. Based on the waste heat gas adjustment emission information and the planned demand for waste heat, the opening of the check valve of each gas buffer chamber and the power of the variable frequency traction fan corresponding to the waste heat utilization project are controlled.

2. The method for recovering waste heat from an annealing furnace according to claim 1, characterized in that: The S5 comprises the following steps: S51. Based on the current temperature and time, matching the waste heat plan demand; S52. According to the waste heat plan, the mixing chambers are allocated to different waste heat utilization projects, wherein one waste heat utilization project corresponds to a group of mixing chambers; S53. Based on the waste heat gas adjustment emission information and the planned demand for waste heat, adjust the opening of the check valve of each gas buffer chamber and the power of the variable frequency traction fan corresponding to the waste heat utilization project to adjust the gas supply of the mixing chamber to the waste heat utilization project.

3. The method for recovering waste heat from an annealing furnace according to claim 2, characterized in that: The S53 comprises the following steps: S5301. After entering the working period when the annealing kiln starts working, a waste heat utilization plan is matched, wherein the gas buffer chamber is provided with an exhaust valve and a plurality of mixing valves, and different mixing valves are respectively connected to the communicating vessels corresponding to different waste heat utilization projects; S5302. Open and adjust the check valve, and control the exhaust valve to open and the mixing valve to close to inflate and ventilate the gas buffer chamber of the new annealing furnace; S5303. Detect the temperature and pressure until the temperature and pressure in the gas buffer chamber meet the standards; S5304. Gradually open the mixing valve and gradually close the exhaust valve, and control the power of the variable frequency traction fan and the opening of the check air valve according to the waste heat utilization plan.

4. The method for recovering waste heat from an annealing furnace according to claim 2, characterized in that: The S5 further comprises the following steps: S5311. After entering the working period of reducing the work of the annealing kiln, and matching the waste heat utilization plan; S5312 detects temperature and pressure, and continues to inflate the gas buffer chamber of the annealing furnace exiting production to maintain the annealing furnace pressure stable; S5313. Gradually close the mixing valve and gradually open the exhaust valve, and control the power of the variable frequency traction fan and the opening of the check air valve according to the waste heat utilization plan.

5. The method for recovering waste heat from an annealing furnace according to claim 2, characterized in that: The S5 further comprises the following steps: S5321. Obtain the planned waste heat demand in adjacent time periods to calculate the change in waste heat demand; S5322. Based on the change in waste heat demand, find the gas buffer chamber combination that needs to be adjusted accordingly; S5323. Select a gas buffer chamber from the lowest priority combination that leads to the waste heat utilization project that needs to be adjusted, and adjust the opening. At the same time, control the power of the variable frequency traction fan and the opening of the check air valve according to the waste heat utilization plan.

6. The method for recovering waste heat from an annealing furnace according to any one of claims 3 to 5, characterized in that: The method of controlling the power of the variable frequency traction fan and the opening of the check valve according to the waste heat utilization scheme includes the following steps: Obtain the waste heat plan demand and waste heat demand change to generate the power change curve of the variable frequency traction fan; The waste heat gas adjustment emission information corresponding to each gas buffer chamber, the current opening information of the check valve and the opening change curve of the mixing valve of the newly added or exited gas buffer chamber are obtained, and together with the power change curve of the variable frequency traction fan, they are input into the pre-trained machine model to obtain the opening adjustment control curve of each gas buffer chamber.

7. An annealing kiln waste heat recovery device, characterized in that: include: The production status acquisition module is used to obtain the production batch status and production schedule of each annealing kiln; The waste heat gas information query module is used to determine the waste heat gas standard emission information of the production batch corresponding to the annealing kiln; wherein the waste heat gas standard emission information includes waste heat gas emission flow information, waste heat gas emission temperature information and waste heat gas emission pressure information; The waste heat gas information adjustment module is used to obtain the current ambient temperature and current ambient pressure information corresponding to the annealing kiln to adjust the waste heat gas emission information of the annealing kiln to obtain the waste heat gas adjustment emission information; The waste heat demand calculation module is used to obtain the planned demand for waste heat based on the current time and ambient temperature; the adjustment module is used to control the opening of the check valve of each gas buffer chamber and the power of the variable frequency traction fan corresponding to the waste heat utilization project based on the waste heat gas emission adjustment information and the planned demand for waste heat.

8. A computer device, characterized in that: It includes: one or more processors; Memory; One or more application programs, wherein the one or more application programs are stored in the memory and are configured to be executed by the one or more processors, and the one or more programs are configured to: execute the annealing kiln waste heat recovery method according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that: The storage medium stores at least one instruction, at least one program, a code set or an instruction set, and the at least one instruction, the at least one program, the code set or the instruction set are loaded and executed by the processor to implement: the annealing kiln waste heat recovery method as described in any one of claims 1 to 6.

Images