Heating furnace temperature coupling type control system and control method based on grid temperature measurement

Abstract

The invention relates to a heating furnace temperature coupling type control system and method based on grid temperature measurement, and belongs to the field of industrial heating furnaces. The heating furnace comprises a heating furnace body, a grid temperature measurement system, a coupling type control system and a furnace temperature control method. The heating furnace body is divided into different areas, and the grid temperature measuring system is composed of a plurality of high-temperature gas sensors and used for measuring the flue gas temperature of the different areas in the furnace. The coupling type control system comprises a pulse type combustion control system and a section adjusting type combustion control system, operation of the combustor can be adjusted in real time according to the difference between the temperature in the furnace and the set temperature, and therefore accurate control over the temperature in the furnace is achieved. According to the control method, different control strategies are adopted according to furnace blanks in different temperature ranges. By means of the method, efficient and accurate control over the temperature in the heating furnace can be achieved, meanwhile, energy consumption is optimized, and heating quality is improved.

Description

Technical Field

[0001] The invention belongs to the field of industrial heating furnaces, and relates to a heating furnace temperature coupling control system and a control method based on grid temperature measurement. Background Art

[0002] The industrial heating furnace plays an important role in the entire steel process, connecting the continuous casting unit at the top and the steel rolling unit at the bottom. Its main function is to heat the hot billets of the continuous casting machine or the cold billets in the storage warehouse to the billet surface temperature and core temperature that meet the rolling requirements. As a key equipment in the steel rolling area, the industrial heating furnace plays a vital role in the billet heating quality. At the same time, the energy consumption of the heating furnace unit accounts for up to 80% of the energy consumption of the steel rolling process, which plays a decisive role in energy conservation and emission reduction in the steel rolling area.

[0003] In the actual production process, the challenges faced by industrial heating furnaces include the continuous fluctuation of market orders, the failure of a single device affecting production stability, and the overall lack of equipment configuration in the continuous casting unit and steel rolling unit. These factors cause the industrial heating furnace to sometimes face hot billets and sometimes face cold billets when the billets enter the furnace. If the heating system is completely considered according to the hot billets, it is easy to have insufficient heating capacity when heating cold billets; and if the heating furnace system is completely considered according to the cold billets, it is easy to cause energy waste when heating hot billets.

[0004] Therefore, according to different production conditions, different temperature billets and other external conditions, and taking into account factors such as investment return, heating efficiency, heating quality, and energy consumption, a heating furnace temperature coupling control system and control method based on grid temperature measurement is proposed. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a heating furnace temperature coupling control system and control method based on grid temperature measurement, which aims to solve the problems of drastic fluctuations in billet temperature, frequent changes in energy flow, and coexistence of good and poor heating quality in the actual production of the heating furnace, and to achieve the goal of optimizing energy consumption and improving heating quality in the billet heating process.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A heating furnace temperature coupling control system based on grid temperature measurement, comprising:

[0008] Heating furnace body;

[0009] A grid temperature measurement system, including X high-temperature gas sensors, is arranged on the heating furnace body;

[0010] Coupling control system, including pulse combustion control system and segment regulation combustion control system;

[0011] A pulse type combustion control system, comprising an air pulse ring pipe, a gas pulse ring pipe, N pulse burners, and N first air pipes and N first gas pipes connected to the pulse burners, wherein the first air pipe of each pulse burner is connected to the air pulse ring pipe, the first gas pipe is connected to the gas pulse ring pipe, and further connected to the air main pipe and the gas main pipe;

[0012] A segment-regulating combustion control system comprises an air segment flow orifice plate, an air segment regulating cut-off valve, a gas segment flow orifice plate, a gas segment regulating cut-off valve, M flat-flame burners, and M second air pipes and M second gas pipes connected with the flat-flame burners; the air segment flow orifice plate and the air segment regulating cut-off valve constitute an air segment pipe, and the gas segment flow orifice plate and the gas segment regulating cut-off valve constitute a gas segment pipe; the second air pipe of each flat-flame burner is connected with the air segment pipe, the second gas pipe is connected with the gas segment pipe, and further connected with the air main pipe and the gas main pipe.

[0013] Optionally, the heating furnace body is divided into a billet preheating zone, a billet heating zone and a billet equalizing zone along the furnace length direction. The billet preheating zone of the heating furnace is not heated, and the upper and lower parts of the billet heating zone adopt a furnace temperature pulse type combustion control system, the upper part of the billet equalizing zone adopts a furnace temperature segment adjustment type combustion control system, and the lower part of the billet equalizing zone adopts a furnace temperature pulse type combustion control system.

[0014] Optionally, the heating furnace body is divided into a furnace bottom, a side wall and a furnace top in the direction of the furnace height, the pulse burner is installed on the side wall of the heating furnace, and the flat flame burner is installed on the furnace top; in the direction of the furnace width, the heating furnace side wall and furnace top burners are symmetrically arranged.

[0015] Optionally, the high-temperature gas sensor is arranged on the top of the billet preheating zone, the side wall and / or top of the billet heating zone, and the side wall and / or top of the billet equalizing zone of the heating furnace; the high-temperature gas sensor is used to measure the flue gas temperature in the installation location area.

[0016] Optionally, a high temperature gas sensor is installed between every two pulse burners in the lower part of the billet heating zone as a temperature grid control zone, and its high temperature gas sensor is installed on the side wall;

[0017] A high-temperature gas sensor is installed between every two pulse burners in the upper part of the billet heating zone, which serves as a temperature grid control zone, and its high-temperature gas sensor is installed on the furnace top;

[0018] A high-temperature gas sensor is installed between every two pulse burners in the lower part of the billet equalizing zone, which serves as a temperature grid control zone, and its high-temperature gas sensor is installed on the side wall;

[0019] A high-temperature gas sensor is installed between multiple flat flame burners on the upper part of the billet equalizing zone as a temperature grid control zone, and its high-temperature gas sensor is installed on the furnace top.

[0020] A heating furnace temperature coupling control method based on grid temperature measurement, including pulse combustion control and segment regulation combustion control;

[0021] Pulse combustion control: When the working cycle of a single pulse burner is t (t = t 燃 +t 不燃 ), the difference △T between the actual temperature T1 and the set temperature T2 in the grid control area and the difference change rate are used as signals to control the percentage of the working cycle t of the pulse burner in the grid control area in real time (t 燃 ) to realize the temperature control of the grid control area;

[0022] Segment-regulated combustion control: Using the difference △T and the difference change rate between the actual temperature T1 of the flat flame burner grid control area and the set temperature T2 of the grid control area as signals, the opening of the gas segment regulating shut-off valve and the air segment regulating shut-off valve are controlled in real time to adjust the gas and air flow in the segment and realize the control of the temperature of the grid control area.

[0023] Optionally, the gas terminal pulse valve of the first gas pipeline and the air terminal pulse valve of the first air pipeline are in an interlocking relationship, that is, when one is opened, the other is opened accordingly, and when one is closed, the other is closed accordingly.

[0024] Optionally, the gas terminal orifice plate and the gas terminal butterfly valve of the first gas pipeline calibrate the pulse burner in the grid control area to the rated power;

[0025] The gas terminal ball valve of the first gas pipeline will manually cut off the gas supply to the pulse burner;

[0026] The gas terminal pulse valve of the first gas pipeline controls the percentage of the working cycle t of the pulse burner in the grid control area by turning the valve "on" and "off";

[0027] The air terminal orifice plate and air terminal butterfly valve of the first air duct calibrate the pulse burner in the grid control area to the rated power;

[0028] The gas terminal butterfly valve of the first air pipeline can also manually cut off the gas supply to the pulse burner;

[0029] The air terminal pulse valve of the first air duct controls the percentage of the working cycle t of the pulse burner in the grid control area by turning the valve "on" and "off";

[0030] The gas terminal pulse valve of the first gas pipeline and the air terminal pulse valve of the first air pipeline are in an interlocking relationship. When one is opened, the other is opened accordingly, and when one is closed, the other is closed accordingly.

[0031] Optionally, the gas terminal butterfly valve of the second gas pipeline will calibrate the flat flame burner in the grid control area to the rated power, and the gas terminal ball valve of the second gas pipeline will manually cut off the gas supply to the flat flame burner;

[0032] The air terminal butterfly valve of the second air duct calibrates the flat flame burner in the grid control area to the rated power and manually cuts off the gas supply to the flat flame burner;

[0033] The gas section regulating cut-off valve and the air section regulating cut-off valve of the section regulating type combustion control system are in an inter-regulating and inter-cutting relationship. If one side is adjusted up, the other side will be adjusted up accordingly, and if one side is closed, the other side will be closed accordingly.

[0034] Optionally, the first control method is used when the blanks entering the heating furnace are all cold blanks at 20°C-400°C, the second control method is used when the blanks entering the heating furnace are mixed cold and hot blanks, and the third control method is used when the blanks entering the heating furnace are all hot blanks at 400°C-900°C;

[0035] The control method of the heating furnace temperature coupling control system comprises the following steps: a. judging the temperature interval of the blank entering the heating furnace, and selecting the control method of the corresponding temperature interval; b. heating the heating furnace temperature according to the selected control method;

[0036] Among them, the first control method is to set the temperature of each zone of the heating furnace to T 冷预 , T 冷加 , T 冷均 After the cold billet enters the heating furnace, it is heated according to the set temperature. At this time, the pulse burner working cycle is the burning time t within t 燃 The proportion is high, and the V value of the section regulating cut-off valve opening is high;

[0037] Among them, the second control method is to set the temperature of each zone of the heating furnace to T 混预 , T 混加 , T 混均 After the hot and cold mixed blanks enter the heating furnace, they are heated according to the set temperature. At this time, the pulse burner working cycle is the burning time t within t 燃 The duty ratio is in the middle, and the V value of the section regulating cut-off valve opening is in the middle;

[0038] Among them, the third control method is to set the temperature of each zone of the heating furnace to T 热预 , T 热加 , T 热均After the hot billet enters the heating furnace, it is heated according to the set temperature. At this time, the pulse burner working cycle is the burning time t within t 燃 The proportion is low, and the V value of the section regulating cut-off valve opening is low.

[0039] The beneficial effects of the present invention are:

[0040] The present invention divides the heating furnace body into grids, which can achieve accurate control of the temperature inside the furnace;

[0041] The present invention adopts a pulse combustion control system in the upper and lower heating zones and the lower soaking zone of the heating furnace to ensure that each pulse burner is 燃 Working at rated load during the cycle can avoid the problem of small flow regulation of burners and valves, ensure full combustion of fuel, and achieve uniformity of flame length and furnace temperature along the furnace width, which can not only improve the heating quality of billets, but also save combustion consumption;

[0042] The present invention adopts a segment-regulated combustion control system in the upper part of the heating furnace soaking zone to ensure the full combustion of gas and air, thereby improving the combustion efficiency, reducing the loss of iron oxide scale, ensuring the temperature uniformity of the billet in the furnace width direction, reducing the temperature difference of the billet cross section, and improving the heating quality of the billet;

[0043] The present invention will rely on the coupled control system to formulate three control methods, respectively targeting the three states of the billets entering the furnace being fully cold loaded, mixed cold and hot loaded, and fully hot loaded, so as to control the pulse type combustion control system and the segment adjustment type combustion control system, and realize precise grid-based control of the furnace body temperature partitions, thereby meeting the goal of "high quality, high efficiency, and low consumption" continuous production of the heating furnace.

[0044] This solution uses a grid-based temperature measurement system to achieve precise temperature control of different areas in the industrial heating furnace, thereby significantly improving the heating quality and efficiency. This innovative technology can not only use different control strategies according to the temperature range of the billet entering the furnace to optimize energy consumption and achieve energy conservation and emission reduction, but also has extremely high flexibility and adaptability, and can effectively cope with the challenges of temperature fluctuations in the production process.

[0045] In addition, the system is designed with ease of operation in mind, reducing operational difficulty and maintenance costs, helping to improve the stability of the production process, reducing equipment wear caused by improper temperature control, and extending the service life of the heating furnace and related equipment. By precisely controlling the temperature inside the furnace, this solution helps to improve the stability of the production process, reduce production problems caused by temperature fluctuations, and ensure the continuity and reliability of production.

[0046] More importantly, precise temperature control not only improves the heating efficiency of the blank, but also further improves the production efficiency of the entire production line. This efficient heating process can not only meet production needs, but also reduce production costs, bringing higher economic benefits to the enterprise.

[0047] In summary, this solution has significant advantages in improving production efficiency, saving energy and reducing consumption, reducing production costs and extending equipment life, and provides strong technical support for the advancement of industrial heating furnace technology and the improvement of production efficiency.

[0048] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0050] Figure 1 It is an overall schematic diagram of the "heating furnace temperature coupling control system and control method based on grid temperature measurement" of the present invention.

[0051] Reference numerals:

[0052] 1. Gas main butterfly valve, 2. Gas main blind valve, 3. Gas main regulating cut-off valve, 4. Gas main flow orifice plate, 5. Gas section pipe flow orifice plate, 6. Gas section regulating cut-off valve, 7. Gas terminal flow orifice plate, 8. Gas terminal butterfly valve, 9. Gas terminal ball valve, 10. Gas terminal pulse valve, 11. Combustion-supporting fan, 12. Fan outlet plug valve, 13. Air main flow orifice plate, 14. Air section pipe flow orifice plate, 15. Air section regulating cut-off valve, 16. Air terminal flow orifice plate, 17. Air terminal butterfly valve, 18. Air terminal pulse valve, 19. Pulse burner, 20. Flat flame burner, 21. High temperature gas sensor. DETAILED DESCRIPTION

[0053] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0054] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0055] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0056] See also Figure 1 , which is a heating furnace temperature coupling control system based on grid temperature measurement, including a heating furnace body, a grid temperature measurement system, a coupling control system and a furnace temperature control method;

[0057] The heating furnace body includes a billet preheating zone, a billet heating zone, and a billet equalizing zone; the grid temperature measurement system includes X high-temperature gas sensors 21, which are arranged in the heating furnace body; the coupling control system includes a pulse combustion control system and a segment adjustment combustion control system; the pulse combustion control system includes an air pulse ring pipe, a gas pulse ring pipe, N pulse burners 19, and N first air pipes and N second gas pipes connected to the pulse burners 19; the segment adjustment combustion control system includes an air segment pipe flow orifice plate 14, an air segment adjustment shut-off valve 15, a gas segment pipe flow orifice plate 5, a gas segment adjustment shut-off valve 6, M flat flame burners 20, and M second air pipes and M second gas pipes connected to the flat flame burners 20;

[0058] The pulse burner 19 includes an air interface and a gas interface, the air interface is connected to the first air pipeline, and the gas interface is connected to the first gas pipeline; the first air pipeline includes an air terminal pipeline, an air terminal flow orifice plate 16, an air terminal butterfly valve 17, and an air terminal pulse valve 18; the first gas pipeline includes a gas terminal pipeline, a gas terminal flow orifice plate 7, a gas terminal butterfly valve 8, a gas terminal ball valve 9, and a gas terminal pulse valve 10;

[0059] The flat flame burner 20 includes an air interface and a gas interface, the air interface is connected to the second air pipeline, and the gas interface is connected to the second gas pipeline; the second air pipeline includes an air terminal pipeline and an air terminal butterfly valve 17; the second gas pipeline includes a gas terminal pipeline, a gas terminal butterfly valve 8, and a gas terminal ball valve 9;

[0060] The first air pipeline and the first gas pipeline of each pulse burner 19 are respectively connected with the air pulse ring pipe and the gas pulse ring pipe, and then connected with the air main pipeline and the gas main pipeline. The gas main pipeline is provided with a gas main butterfly valve 1, a gas main blind plate valve 2, a gas main regulating cut-off valve 3, and a gas main flow orifice plate 4; the air main pipeline is provided with a combustion-supporting fan 11, a fan outlet plug valve 12, and an air main flow orifice plate 13;

[0061] The second air pipeline and the second gas pipeline of each flat flame burner 20 are respectively connected to the air section pipe (including the air orifice plate and the air section regulating and shutting off valve 15) and the gas section pipe (including the gas orifice plate and the gas section regulating and shutting off valve 6), and then connected to the air main pipeline and the gas main pipeline;

[0062] In this embodiment, the billet preheating zone of the heating furnace is not heated, the upper and lower parts of the billet heating zone adopt a furnace temperature pulse type combustion control system, the upper part of the billet equalizing zone adopts a furnace temperature segment adjustment type combustion control system, and the lower part of the billet equalizing zone adopts a furnace temperature pulse type combustion control system;

[0063] The heating furnace body can be divided into a billet preheating zone, a billet heating zone, and a billet soaking zone according to the furnace length direction; it can be divided into a furnace bottom, a side wall, and a furnace top according to the furnace height direction; the pulse burner 19 is installed on the side wall of the heating furnace, and the flat flame burner 20 is installed on the furnace top; according to the furnace width direction, the burners on the side wall and the furnace top of the heating furnace are arranged symmetrically;

[0064] The high temperature gas sensor 21 is arranged on the furnace top of the billet preheating zone, the side wall / furnace top of the billet heating zone, and the side wall / furnace top of the billet soaking zone of the heating furnace; the high temperature gas sensor 21 is used to measure the flue gas temperature in the installation location area;

[0065] In this embodiment, a high temperature gas sensor 21 is installed between every two pulse burners 19 in the lower part of the billet heating zone, which serves as a temperature grid control zone, and its high temperature gas sensor 21 is installed on the side wall;

[0066] A high temperature gas sensor 21 is installed between every two pulse burners 19 in the upper part of the billet heating zone, which serves as a temperature grid control zone, and its high temperature gas sensor 21 is installed on the furnace top;

[0067] A high temperature gas sensor 21 is installed between every two pulse burners 19 in the lower part of the billet equalizing zone, which serves as a temperature grid control zone, and its high temperature gas sensor 21 is installed on the side wall;

[0068] A high temperature gas sensor 21 is installed between the multiple flat flame burners 20 at the upper part of the billet equalizing zone, which serves as a temperature grid control zone, and its high temperature gas sensor 21 is installed on the furnace top;

[0069] The gas terminal flow orifice plate 7 and the gas terminal butterfly valve 8 of the first gas pipeline calibrate the pulse burner 19 in the grid control area to the rated power; the gas terminal ball valve 9 of the first gas pipeline manually cuts off the gas supply to the pulse burner 19; the gas terminal pulse valve 10 of the first gas pipeline controls the percentage of the working cycle t of the pulse burner 19 in the grid control area by turning the valve "on" and "off";

[0070] The air terminal flow orifice plate 16 and the air terminal butterfly valve 17 of the first air pipeline calibrate the pulse burner 19 in the grid control area to the rated power; the gas terminal butterfly valve 8 of the first air pipeline can also manually cut off the gas supply to the pulse burner 19; the air terminal pulse valve 18 of the first air pipeline controls the percentage of the working cycle t of the pulse burner 19 in the grid control area by turning the valve "on" and "off";

[0071] The gas terminal pulse valve 10 of the first gas pipeline and the air terminal pulse valve 18 of the first air pipeline are in an interlocking relationship, which means that when one is opened, the other is opened accordingly, and when one is closed, the other is closed accordingly;

[0072] The gas terminal butterfly valve 8 of the second gas pipeline will calibrate the flat flame burner 20 in the grid control area to the rated power, and the gas terminal ball valve 9 of the second gas pipeline will manually cut off the gas supply to the flat flame burner 20;

[0073] The air terminal butterfly valve 17 of the second air duct calibrates the flat flame burner 20 in the grid control area to the rated power and manually cuts off the gas supply to the flat flame burner 20;

[0074] The gas section regulating cut-off valve 6 and the air section regulating cut-off valve 15 of the section regulating combustion control system are in a mutually regulating and mutually cutting relationship, which means that if one is adjusted up, the other is adjusted up accordingly, and if one is closed, the other is closed accordingly;

[0075] A heating furnace temperature coupling control method based on grid temperature measurement, relying on the furnace temperature coupling control system, adopts a first control method when the billets entering the heating furnace are all cold billets (20°C-400°C), adopts a second control method when the billets entering the heating furnace are mixed cold and hot, and adopts a third control method when the billets entering the heating furnace are all hot billets (400°C-900°C);

[0076] The control method of the heating furnace temperature coupling control system comprises the following steps:

[0077] S1, determine the temperature range of the blank entering the heating furnace, and select the control method for the corresponding temperature range;

[0078] S2, heating the heating furnace according to the selected control method;

[0079] When the first control method is selected in step S2, the temperatures of each zone of the heating furnace are T 冷预 , T 冷加 , T 冷均 Because the temperature of the billet entering the heating furnace is low, the furnace temperature drops sharply, and the difference △T between the actual temperature T1 of the grid control area and the set temperature T2 of the grid control area in the pulse combustion system is large, the control method will trigger a signal to increase the t of the pulse burner in the grid control area. 燃 In the working cycle t, the proportion; at the same time, because the difference △T between the actual temperature T1 of the grid control area and the set temperature T2 of the grid control area in the segment-regulated combustion system is large, the control method will trigger a signal to increase the opening of the gas segment regulating cut-off valve 6 and the air segment regulating cut-off valve 15, increase the gas flow and air flow, and gradually increase the temperature of the grid control area;

[0080] In the process that the difference △T between the actual temperature T1 of the grid control area and the set temperature T2 of the grid control area and the rate of change of the difference gradually decrease, the control method will trigger a signal to gradually reduce the t of the pulse burner in the grid control area. 燃 In the working cycle t, the opening of the gas section regulating cut-off valve 6 and the air section regulating cut-off valve 15 is gradually reduced to ensure that the actual temperature T1 of the grid control area gradually approaches the set temperature T2 of the grid control area, so as to achieve precise temperature control;

[0081] When the second control method is selected in step S2, the temperatures of each zone of the heating furnace are T 混预 , T 混加 , T 混均 Because the temperature of the billet entering the heating furnace is moderate, the degree of furnace temperature reduction is moderate, and the difference △T between the actual temperature T1 of the grid control area and the set temperature T2 of the grid control area in the pulse combustion system is moderate, the control method will trigger a signal to increase the t of the pulse burner in the grid control area. 燃 In the working cycle t, the proportion; at the same time, because the difference △T between the actual temperature T1 of the grid control area and the set temperature T2 of the grid control area in the segment-regulated combustion system is moderate, the control method will trigger a signal to increase the opening of the gas segment regulating cut-off valve 6 and the air segment regulating cut-off valve 15, increase the gas flow and air flow, and gradually increase the temperature of the grid control area;

[0082] In the process that the difference △T between the actual temperature T1 of the grid control area and the set temperature T2 of the grid control area and the rate of change of the difference gradually decrease, the control method will trigger a signal to gradually reduce the t of the pulse burner in the grid control area.燃 In the working cycle t, the opening of the gas section regulating cut-off valve 6 and the air section regulating cut-off valve 15 is gradually reduced to ensure that the actual temperature T1 of the grid control area gradually approaches the set temperature T2 of the grid control area, so as to achieve precise temperature control;

[0083] When the third control method is selected in step S2, the temperatures of each zone of the heating furnace are T 热预 , T 热加 , T 热均 Because the temperature of the billet entering the heating furnace is high, the furnace temperature is weakly reduced. Because the difference △T between the actual temperature T1 of the grid control area and the set temperature T2 of the grid control area in the pulse combustion system is small, the control method will trigger a signal to reduce the t of the pulse burner in the grid control area. 燃 In the working cycle t, the proportion; at the same time, because the difference △T between the actual temperature T1 of the grid control area and the set temperature T2 of the grid control area in the segment-regulated combustion system is small, the control method will trigger a signal to reduce the opening of the gas segment regulating cut-off valve 6 and the air segment regulating cut-off valve 15, reduce the gas flow and air flow, and stabilize the temperature of the grid control area;

[0084] In the process that the difference △T between the actual temperature T1 of the grid control area and the set temperature T2 of the grid control area and the rate of change of the difference gradually decrease, the control method will trigger a signal to gradually reduce the proportion of the pulse burner 19 in the grid control area in the working cycle t, and gradually reduce the opening of the gas section regulating cut-off valve 6 and the air section regulating cut-off valve 15, so as to ensure that the actual temperature T1 of the grid control area gradually approaches the set temperature T2 of the grid control area, so as to achieve precise temperature control;

[0085] In this embodiment, the system sets the temperature relationship between the heating furnace zones: T 预 <T 均 <T 加 ;

[0086] In this embodiment, the air main flow orifice plate 13 and the gas main flow orifice plate 4 are used for air and gas flow metering; the air segment pipe flow orifice plate 14 and the gas segment pipe flow orifice plate 5 are used for segment pipe flow regulation and regulating valve opening feedback; the air terminal orifice plate of the first air pipeline and the gas terminal orifice plate of the first gas pipeline are used to calibrate the pulse burner 19 in the grid control area to the rated state.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A heating furnace temperature coupling control system based on grid temperature measurement, characterized in that: include: Heating furnace body; A grid temperature measurement system, including X high-temperature gas sensors, is arranged on the heating furnace body; Coupling control system, including pulse combustion control system and segment regulation combustion control system; A pulse type combustion control system, comprising an air pulse ring pipe, a gas pulse ring pipe, N pulse burners, and N first air pipes and N first gas pipes connected to the pulse burners, wherein the first air pipe of each pulse burner is connected to the air pulse ring pipe, the first gas pipe is connected to the gas pulse ring pipe, and further connected to the air main pipe and the gas main pipe; A segment-regulating combustion control system comprises an air segment flow orifice plate, an air segment regulating cut-off valve, a gas segment flow orifice plate, a gas segment regulating cut-off valve, M flat-flame burners, and M second air pipes and M second gas pipes connected with the flat-flame burners; the air segment flow orifice plate and the air segment regulating cut-off valve constitute an air segment pipe, and the gas segment flow orifice plate and the gas segment regulating cut-off valve constitute a gas segment pipe; the second air pipe of each flat-flame burner is connected with the air segment pipe, the second gas pipe is connected with the gas segment pipe, and further connected with the air main pipe and the gas main pipe.

2. The heating furnace temperature coupling control system based on grid temperature measurement according to claim 1 is characterized in that: The heating furnace body is divided into billet preheating zone, billet heating zone and billet equalizing zone according to the furnace length direction. The billet preheating zone of the heating furnace is not heated. The upper and lower parts of the billet heating zone adopt a furnace temperature pulse type combustion control system. The upper part of the billet equalizing zone adopts a furnace temperature segment adjustment type combustion control system, and the lower part of the billet equalizing zone adopts a furnace temperature pulse type combustion control system.

3. The heating furnace temperature coupling control system based on grid temperature measurement according to claim 1 is characterized in that: The heating furnace body is divided into furnace bottom, side wall and furnace top according to the furnace height direction. The pulse burner is installed on the side wall of the heating furnace, and the flat flame burner is installed on the furnace top. According to the furnace width direction, the heating furnace side wall and furnace top burners are arranged symmetrically.

4. The heating furnace temperature coupling control system based on grid temperature measurement according to claim 3 is characterized in that: The high temperature gas sensor is arranged on the furnace top of the billet preheating zone, the side wall and / or the furnace top of the billet heating zone, and the side wall and / or the furnace top of the billet soaking zone; the high temperature gas sensor is used to measure the flue gas temperature in the installation location area.

5. The heating furnace temperature coupling control system based on grid temperature measurement according to claim 2 is characterized in that: A high temperature gas sensor is installed between every two pulse burners in the lower part of the billet heating zone, which serves as a temperature grid control zone, and its high temperature gas sensor is installed on the side wall; A high-temperature gas sensor is installed between every two pulse burners in the upper part of the billet heating zone, which serves as a temperature grid control zone, and its high-temperature gas sensor is installed on the furnace top; A high-temperature gas sensor is installed between every two pulse burners in the lower part of the billet equalizing zone, which serves as a temperature grid control zone, and its high-temperature gas sensor is installed on the side wall; A high-temperature gas sensor is installed between multiple flat flame burners on the upper part of the billet equalizing zone as a temperature grid control zone, and its high-temperature gas sensor is installed on the furnace top.

6. A control method for a heating furnace temperature coupling control system based on grid temperature measurement according to any one of claims 1 to 5, characterized in that: Including pulse combustion control and segment regulation combustion control; Pulse combustion control: When the working cycle of a single pulse burner is t (t = t 燃 +t 不燃 ), the difference △T between the actual temperature T1 and the set temperature T2 in the grid control area and the difference change rate are used as signals to control the percentage of the working cycle t of the pulse burner in the grid control area in real time (t 燃 ) to realize the temperature control of the grid control area; Segment-regulated combustion control: Using the difference △T and the difference change rate between the actual temperature T1 of the flat flame burner grid control area and the set temperature T2 of the grid control area as signals, the opening of the gas segment regulating shut-off valve and the air segment regulating shut-off valve are controlled in real time to adjust the gas and air flow in the segment and realize the control of the temperature of the grid control area.

7. The control method according to claim 6, characterized in that: The gas terminal pulse valve of the first gas pipeline and the air terminal pulse valve of the first air pipeline are in an interlocking relationship. When one is opened, the other is opened accordingly, and when one is closed, the other is closed accordingly.

8. The control method according to claim 6, characterized in that: The gas terminal orifice plate and gas terminal butterfly valve of the first gas pipeline calibrate the pulse burner in the grid control area to the rated power; The gas terminal ball valve of the first gas pipeline will manually cut off the gas supply to the pulse burner; The gas terminal pulse valve of the first gas pipeline controls the percentage of the working cycle t of the pulse burner in the grid control area by turning the valve "on" and "off"; The air terminal orifice plate and air terminal butterfly valve of the first air duct calibrate the pulse burner in the grid control area to the rated power; The gas terminal butterfly valve of the first air pipeline can also manually cut off the gas supply to the pulse burner; The air terminal pulse valve of the first air duct controls the percentage of the working cycle t of the pulse burner in the grid control area by turning the valve "on" and "off"; The gas terminal pulse valve of the first gas pipeline and the air terminal pulse valve of the first air pipeline are in an interlocking relationship. When one is opened, the other is opened accordingly, and when one is closed, the other is closed accordingly.

9. The control method according to claim 6, characterized in that: The gas terminal butterfly valve of the second gas pipeline will calibrate the flat flame burner in the grid control area to the rated power, and the gas terminal ball valve of the second gas pipeline will manually cut off the gas supply to the flat flame burner; The air terminal butterfly valve of the second air duct calibrates the flat flame burner in the grid control area to the rated power and manually cuts off the gas supply to the flat flame burner; The gas section regulating cut-off valve and the air section regulating cut-off valve of the section regulating type combustion control system are in an inter-regulating and inter-cutting relationship. If one side is adjusted up, the other side will be adjusted up accordingly, and if one side is closed, the other side will be closed accordingly.

10. The control method according to claim 6, characterized in that: The first control method is used when the blanks entering the heating furnace are all cold blanks at 20°C-400°C, the second control method is used when the blanks entering the heating furnace are mixed cold and hot, and the third control method is used when the blanks entering the heating furnace are all hot blanks at 400°C-900°C; The control method of the heating furnace temperature coupling control system comprises the following steps: a. judging the temperature interval of the blank entering the heating furnace, and selecting the control method of the corresponding temperature interval; b. heating the heating furnace temperature according to the selected control method; Among them, the first control method is to set the temperature of each zone of the heating furnace to T 冷预 、T 冷加 、T 冷均 After the cold billet enters the heating furnace, it is heated according to the set temperature. At this time, the pulse burner working cycle is the burning time t within t 燃 The proportion is high, and the V value of the section regulating cut-off valve opening is high; Among them, the second control method is to set the temperature of each zone of the heating furnace to T 混预 、T 混加 、T 混均 After the hot and cold mixed blanks enter the heating furnace, they are heated according to the set temperature. At this time, the pulse burner working cycle is the burning time t within t 燃 The duty ratio is in the middle, and the V value of the section regulating cut-off valve opening is in the middle; Among them, the third control method is to set the temperature of each zone of the heating furnace to T 热预 , T 热加 , T 热均 After the hot billet enters the heating furnace, it is heated according to the set temperature. At this time, the pulse burner working cycle is the burning time t within t 燃 The proportion is low, and the V value of the section regulating cut-off valve opening is low.

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