Method, device and equipment for controlling furnace pressure of normalizing furnace and medium

Abstract

The invention discloses a control method, device and equipment for furnace pressure of a normalizing furnace and a medium, and belongs to the technical field of metallurgy. The method comprises the steps that the furnace pressure of a normalizing furnace is obtained; and the furnace pressure is controlled to be gradually increased in the running direction of the strip steel in the normalizing furnace. The method can effectively prevent a large amount of combustion waste gas from flowing back to the rear half section of the normalizing furnace, reduce the pollution of the hearth atmosphere of the rear half section of the normalizing furnace, reduce the surface oxidation degree of the product and reduce the nodulation degree of the furnace roller, thereby reducing the quality defects of the product.

Description

Technical Field

[0001] The present invention relates to the field of metallurgical technology, and in particular to a method, device, equipment and medium for controlling the furnace pressure of a normalizing furnace. Background Art

[0002] Affected by a series of energy-saving and emission-reduction policies in industries such as new energy vehicles and new energy-efficient transformers, the market demand for high-silicon electrical steel has grown significantly. The normalizing pickling unit is the first process of high-silicon electrical steel. Its production technology level and product quality are directly related to the performance and quality of the finished product, and the normalizing furnace is the core equipment of the normalizing pickling unit. The normalizing furnace is a pre-rolling heat treatment furnace for high-grade non-oriented silicon steel and oriented silicon steel. The furnace pressure control of the normalizing furnace is crucial and directly affects the surface quality of the product.

[0003] At present, the inlet and outlet pressures of the normalizing furnace are controlled within the standard pressure range to improve the surface quality of the product. However, the above method only controls the inlet and outlet pressures of the normalizing furnace, and does not control the pressure in the middle of the normalizing furnace, resulting in a large amount of combustion exhaust gas generated in the front half of the normalizing furnace flowing back to the back half of the normalizing furnace, polluting the atmosphere of the furnace in the back half, causing surface oxidation of the product, aggravating the degree of nodulation of the furnace roller, and causing small black spot defects in the product, forming long stripe defects after rolling, which seriously affects the product quality. Summary of the invention

[0004] In view of the above problems, the present invention is proposed to provide a method, device, equipment and medium for controlling the furnace pressure of a normalizing furnace to solve the above problems. The furnace pressure can be controlled to gradually increase along the running direction of the strip in the normalizing furnace, thereby effectively preventing the combustion exhaust gas in the normalizing furnace from flowing back to the rear half of the normalizing furnace, reducing the pollution of the furnace atmosphere in the rear half, reducing the degree of oxidation on the product surface, reducing the degree of nodulation of the furnace rollers, and thus reducing product quality defects.

[0005] In a first aspect, the present invention provides a method for controlling a normalizing furnace pressure, the method comprising:

[0006] Obtaining the furnace pressure of the normalizing furnace;

[0007] The furnace pressure is controlled to gradually increase along the running direction of the strip steel in the normalizing furnace.

[0008] Optionally, the normalizing furnace includes a preheating furnace, an open flame heating furnace, a furnace throat, a soaking furnace and a slow cooling furnace in sequence along the running direction of the steel strip, the furnace pressure includes the furnace pressure of the open flame heating furnace and the furnace pressure of the soaking furnace, and the controlling the furnace pressure to gradually increase along the running direction of the steel strip includes:

[0009] The pressure difference of the furnace pressure in the soaking section minus the furnace pressure in the open flame heating section is controlled to be within a set pressure difference range.

[0010] Optionally, controlling the pressure difference of the furnace pressure in the soaking section minus the furnace pressure in the open flame heating section to be within a set pressure difference range includes:

[0011] If the pressure difference of the furnace pressure in the soaking section minus the furnace pressure in the open flame heating section is lower than the lower limit of the pressure difference range, the flow rate of nitrogen introduced into the slow cooling section is increased;

[0012] If the pressure difference of the furnace pressure in the soaking section minus the furnace pressure in the open flame heating section is higher than the upper limit of the pressure difference range, the flow rate of nitrogen introduced into the slow cooling section is reduced.

[0013] Optionally, controlling the furnace pressure to gradually increase along the running direction of the strip steel in the normalizing furnace includes:

[0014] If the furnace pressure does not gradually increase along the running direction of the steel strip in the normalizing furnace, the pressure of the nitrogen introduced into the slow cooling section is increased so that the furnace pressure gradually increases along the running direction of the steel strip in the normalizing furnace.

[0015] Optionally, increasing the pressure of the nitrogen gas introduced into the slow cooling section comprises:

[0016] The pressure of the nitrogen gas introduced into the slow cooling section is increased by a set multiple.

[0017] Optionally, the controlling the furnace pressure to gradually increase along the running direction of the strip steel in the normalizing furnace further includes:

[0018] If the furnace pressure does not gradually increase along the running direction of the steel strip in the normalizing furnace, the introduction of nitrogen into the furnace throat is stopped.

[0019] In a second aspect, the present invention provides a control device for a normalizing furnace pressure, the device comprising:

[0020] An acquisition module, used for acquiring the furnace pressure of the normalizing furnace;

[0021] The control module is used to control the furnace pressure to gradually increase along the running direction of the strip steel in the normalizing furnace.

[0022] Optionally, the normalizing furnace includes a preheating furnace, an open flame heating furnace, a furnace throat, a soaking furnace and a slow cooling furnace in sequence along the running direction of the steel strip, the furnace pressure includes the furnace pressure of the open flame heating furnace and the furnace pressure of the soaking furnace, and the control module includes:

[0023] The control unit is used to control the pressure difference of the furnace pressure in the soaking section minus the furnace pressure in the open flame heating section to be within a set pressure difference range.

[0024] Optionally, the control unit is further used for:

[0025] If the pressure difference of the furnace pressure in the soaking section minus the furnace pressure in the open flame heating section is lower than the lower limit of the pressure difference range, the flow rate of nitrogen introduced into the slow cooling section is increased;

[0026] If the pressure difference of the furnace pressure in the soaking section minus the furnace pressure in the open flame heating section is higher than the upper limit of the pressure difference range, the flow rate of nitrogen introduced into the slow cooling section is reduced.

[0027] In a third aspect, the present invention provides an electronic device comprising: a memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the method described in the first aspect by executing the computer instructions.

[0028] In a fourth aspect, the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable the computer to execute the method described in the first aspect.

[0029] The technical solution provided in the embodiments of the present invention has at least the following technical effects or advantages:

[0030] The embodiment of the present invention provides a control method, device, equipment and medium for the furnace pressure of a normalizing furnace, which obtains the furnace pressure of the normalizing furnace and understands the distribution of the furnace pressure; controls the furnace pressure to gradually increase along the running direction of the strip in the normalizing furnace, thereby effectively preventing a large amount of combustion exhaust gas from flowing back to the rear half of the normalizing furnace. The method can reduce the pollution of the furnace atmosphere in the rear half of the normalizing furnace, reduce the degree of oxidation on the product surface, reduce the degree of nodulation of the furnace roller, and thus reduce product quality defects.

[0031] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0033] Figure 1 It is a structural schematic diagram of a normalizing furnace provided by an embodiment of the present invention;

[0034] Figure 2 It is a flow chart of a method for controlling furnace pressure of a normalizing furnace provided by an embodiment of the present invention;

[0035] Figure 3 This is a structural block diagram of a control device for a normalizing furnace pressure provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0036] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0037] Before introducing in detail a method for controlling the furnace pressure of a normalizing furnace provided in an embodiment of the present invention, a brief introduction to the implementation environment involved is first given.

[0038] Normalizing furnace is a heat treatment furnace for heating strip steel. Figure 1 Schematic diagram of a normalizing furnace provided by an embodiment of the present invention. Figure 1 As shown, the strip runs from the entrance to the exit of the normalizing furnace, and the strip runs in the direction of the arrow. The normalizing furnace includes a preheating section 1, an open flame heating section 2, a furnace throat 3, a soaking section 4, and a slow cooling section 5 in the running direction of the strip. Pressure sensors P are arranged at the head of the preheating section 1, the tail of the open flame heating section 2, the head of the soaking section 4, and the tail of the slow cooling section 5 to detect the furnace pressure of each section.

[0039] Figure 2 : is a flow chart of a method for controlling furnace pressure of a normalizing furnace provided by an embodiment of the present invention. Figure 1 As shown, the method includes:

[0040] Step S210, obtaining the furnace pressure of the normalizing furnace.

[0041] In this embodiment, the furnace pressure detected by each pressure sensor P is collected, and all the furnace pressures are summarized to obtain the furnace pressure of the normalizing furnace, so as to understand the distribution of the furnace pressure in the normalizing furnace.

[0042] Step S220, controlling the furnace pressure to gradually increase along the running direction of the strip steel in the normalizing furnace.

[0043] In this embodiment, when the normalizing furnace is working, the exhaust gas generated by combustion will flow back to the rear half. Without any control, the furnace pressure in the rear half of the normalizing furnace will gradually decrease along the running direction of the strip, intensifying the flow of the exhaust gas to the rear half of the normalizing furnace, polluting the atmosphere of the soaking furnace and the slow cooling section, causing the surface oxidation of the strip, intensifying the degree of nodulation of the furnace roller, and causing small black spot defects in the product, forming long stripe defects after rolling, seriously affecting the product quality. Therefore, the above situation should be controlled to improve the product quality.

[0044] Specifically, the furnace pressure is controlled to gradually increase along the running direction of the strip in the normalizing furnace, preventing the combustion exhaust gas from flowing to the rear half of the normalizing furnace, reducing the pollution of the furnace atmosphere in the rear half of the normalizing furnace, reducing the degree of surface oxidation of the product, and reducing the degree of nodulation of the furnace rollers, thereby reducing product quality defects.

[0045] Optionally, step S220 includes step S2201.

[0046] Step S2201, control the pressure difference of the furnace pressure in the soaking section minus the furnace pressure in the open flame heating section to be within a set pressure difference range.

[0047] In this embodiment, the furnace pressure may include the furnace pressure of the preheating section, the furnace pressure of the open flame heating section, the furnace pressure of the soaking section, and the furnace pressure of the slow cooling section, that is, the furnace pressure of the preheating section, the furnace pressure of the open flame heating section, the furnace pressure of the soaking section, and the furnace pressure of the slow cooling section are controlled to increase gradually, that is, the furnace pressure of the preheating section < the furnace pressure of the open flame heating section < the furnace pressure of the soaking section < the furnace pressure of the slow cooling section. On this basis, the degree to which the furnace pressure of the open flame heating section is smaller than the furnace pressure of the soaking section can also be additionally controlled, that is, the pressure difference of the furnace pressure of the soaking section minus the furnace pressure of the open flame heating section is controlled to be within the set pressure difference range.

[0048] It can be understood that the furnace pressure in the open flame heating section should be smaller than that in the equalizing section within the pressure difference range, which can more effectively prevent the large amount of combustion exhaust gas in the open flame heating section from flowing back to the equalizing section, thereby improving product quality.

[0049] Exemplarily, the pressure difference ranges from 20-100 Pa.

[0050] Optionally, step S2201 includes:

[0051] If the pressure difference between the furnace pressure in the soaking section and the furnace pressure in the open flame heating section is lower than the lower limit of the pressure difference range, the flow rate of nitrogen entering the slow cooling section shall be increased; if the pressure difference between the furnace pressure in the soaking section and the furnace pressure in the open flame heating section is higher than the upper limit of the pressure difference range, the flow rate of nitrogen entering the slow cooling section shall be reduced.

[0052] In this embodiment, nitrogen can be introduced into the furnace throat to adjust the furnace pressure in the soaking section. Therefore, if it is found that the pressure difference between the furnace pressure in the soaking section and the furnace pressure in the open flame heating section is not within the pressure difference range, the flow rate of nitrogen introduced into the furnace throat is adjusted to fine-tune the furnace pressure in the soaking section by adjusting the nitrogen flow rate.

[0053] Specifically, if the pressure difference between the furnace pressure of the soaking section and the furnace pressure of the open flame heating section is lower than the lower limit of the pressure difference range, it means that the pressure difference between the two is too small, then the flow rate of nitrogen introduced into the furnace throat is increased, the furnace pressure of the soaking section is increased, and the pressure difference between the two is increased; if the pressure difference between the furnace pressure of the soaking section and the furnace pressure of the open flame heating section is higher than the upper limit of the pressure difference range, it means that the pressure difference between the two is too large, then the flow rate of nitrogen introduced into the furnace throat is reduced, the furnace pressure of the soaking section is reduced, and the pressure difference between the two is reduced, so as to better prevent the exhaust gas from flowing back. Among them, introducing nitrogen into the furnace throat can also prevent the combustion exhaust gas generated by the open flame heating section from flowing into the soaking section.

[0054] Optionally, step S220 also includes step S2202.

[0055] Step S2202: If the furnace pressure does not gradually increase along the running direction of the steel strip in the normalizing furnace, the pressure of the nitrogen introduced into the slow cooling section is increased so that the furnace pressure gradually increases along the running direction of the steel strip in the normalizing furnace.

[0056] In this embodiment, the furnace pressure can be gradually increased along the running direction of the strip in the normalizing furnace by introducing nitrogen into the slow cooling section, and the pressure of the introduced nitrogen is adjusted according to actual conditions.

[0057] Specifically, the furnace pressure does not gradually increase along the running direction of the strip in the normalizing furnace, which means that the furnace pressure in a certain section of the normalizing furnace suddenly increases and is higher than the furnace pressure in the subsequent section. At this time, the pressure of the nitrogen introduced into the slow cooling section can be increased to increase the furnace pressure in the subsequent section of the normalizing furnace. Moreover, the nitrogen will slowly spread toward the inlet of the normalizing furnace, thereby adjusting the furnace pressure of each section and promoting the combustion exhaust gas to flow toward the inlet, so that the furnace pressure of each section can eventually continue to increase along the running direction of the strip, while the combustion exhaust gas will flow in the opposite direction of the running direction of the strip.

[0058] For example, if the furnace pressure in the soaking section is higher than that in the slow cooling section, resulting in the furnace pressure not gradually increasing along the running direction of the strip in the normalizing furnace, the pressure of the nitrogen introduced into the slow cooling section is increased to increase the furnace pressure in the slow cooling section, so that the furnace pressure remains gradually increasing along the running direction of the strip in the normalizing furnace, thereby realizing closed-loop control of the furnace pressure.

[0059] Optionally, step S2202 includes:

[0060] Increase the pressure of the nitrogen gas introduced into the slow cooling section by a set multiple.

[0061] In this embodiment, the current pressure of the nitrogen gas introduced into the slow cooling section can be obtained, and the pressure of the nitrogen gas introduced into the slow cooling section can be adjusted to N times the current pressure. The size of N can be set according to the actual situation of the normalizing furnace. For example, if the combustion exhaust gas backflow is serious, N can be set larger; if the backflow is not particularly serious, N can be set smaller.

[0062] Exemplarily, N is 1.8-2.5.

[0063] Based on the same inventive concept, the embodiment of the present invention also provides a control device for the furnace pressure of a normalizing furnace. Figure 3 is a structural block diagram of a control device for a normalizing furnace pressure provided by an embodiment of the present invention, such as Figure 3 As shown, the device 300 includes an acquisition module 301 and a control module 302 .

[0064] An acquisition module 301 is used to acquire the furnace pressure of the normalizing furnace;

[0065] The control module 302 is used to control the furnace pressure to gradually increase along the running direction of the strip steel in the normalizing furnace.

[0066] Optionally, the normalizing furnace includes a preheating furnace, an open flame heating furnace, a furnace throat, a soaking furnace and a slow cooling furnace in sequence along the running direction of the steel strip, and the furnace pressure includes the furnace pressure of the open flame heating furnace and the furnace pressure of the soaking furnace. The control module 302 includes:

[0067] The control unit is used to control the pressure difference between the furnace pressure in the soaking section and the furnace pressure in the open flame heating section to be within a set pressure difference range.

[0068] Optionally, the control unit is further configured to:

[0069] If the pressure difference between the furnace pressure in the soaking section and the furnace pressure in the open flame heating section is lower than the lower limit of the pressure difference range, the flow rate of nitrogen introduced into the slow cooling section is increased;

[0070] If the pressure difference of the furnace pressure in the soaking section minus the furnace pressure in the open flame heating section is higher than the upper limit of the pressure difference range, the flow rate of nitrogen entering the slow cooling section is reduced.

[0071] Optionally, the control module 302 further includes:

[0072] The increasing unit is used to increase the pressure of the nitrogen introduced into the slow cooling section if the furnace pressure does not gradually increase along the running direction of the strip in the normalizing furnace, so that the furnace pressure gradually increases along the running direction of the strip in the normalizing furnace.

[0073] Optionally, the boost unit is also used to:

[0074] Increase the pressure of the nitrogen gas introduced into the slow cooling section by a set multiple.

[0075] It can be understood that the device provided in the above embodiment is only illustrated by the division of the above functional modules. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0076] An embodiment of the present invention further provides an electronic device, which may include a processor and a memory, wherein the processor and the memory may be communicatively connected to each other via a bus or other means.

[0077] The processor may be a central processing unit (CPU) or an application specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiments of the present application.

[0078] The memory may include a large capacity memory for data or instructions. By way of example and not limitation, the memory may include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive or a combination of two or more of these. Where appropriate, the memory may include a removable or non-removable (or fixed) medium. Where appropriate, the memory may be inside or outside the electronic device. In a particular embodiment, the memory may be a non-volatile solid-state memory.

[0079] In one example, the memory may be a read-only memory (ROM). In one example, the ROM may be a mask-programmed ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), an electrically rewritable ROM (EAROM), or a flash memory, or a combination of two or more of these.

[0080] The processor implements any one of the normalizing furnace pressure control methods in the above embodiments by reading and executing computer program instructions stored in the memory.

[0081] In one example, the electronic device may further include a communication interface and a bus. Among them, the processor, memory, and communication interface are connected through a bus and communicate with each other. The communication interface is mainly used to realize the communication between the modules, devices, units and / or devices in the embodiment of the present application. Where appropriate, the bus may include one or more buses.

[0082] In addition, in combination with the control method of the normalizing furnace pressure in the above embodiment, the embodiment of the present invention can provide a computer-readable storage medium for implementation. The computer-readable storage medium stores computer program instructions; when the computer program instructions are executed by the processor, any one of the control methods of the normalizing furnace pressure in the above embodiment is implemented.

[0083] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0084] The embodiment of the present invention provides a control method, device, equipment and medium for the furnace pressure of a normalizing furnace, which obtains the furnace pressure of the normalizing furnace and understands the distribution of the furnace pressure; controls the furnace pressure to gradually increase along the running direction of the strip in the normalizing furnace, thereby effectively preventing a large amount of combustion exhaust gas from flowing back to the rear half of the normalizing furnace. The method can reduce the pollution of the furnace atmosphere in the rear half of the normalizing furnace, reduce the degree of oxidation on the product surface, reduce the degree of nodulation of the furnace roller, and thus reduce product quality defects.

[0085] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0086] Similarly, it should be understood that in order to streamline the present disclosure and aid in understanding one or more of the various inventive aspects, in the above description of exemplary embodiments of the present invention, various features of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, this disclosed method should not be interpreted as reflecting the intention that the claimed invention requires more features than those explicitly recited in each claim. More specifically, as reflected in the claims below, inventive aspects lie in less than all the features of the individual embodiments disclosed above. Therefore, the claims that follow the specific embodiment are hereby expressly incorporated into the specific embodiment, with each claim itself serving as a separate embodiment of the present invention.

[0087] It should be noted that the above embodiments illustrate the present invention rather than limit it, and that those skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets shall not be construed as a limitation on the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claims. The word "one" or "an" preceding a component does not exclude the presence of a plurality of such components. The present invention may be implemented by means of hardware comprising a number of different components and by means of a suitably programmed computer. In a unit claim enumerating a number of devices, several of these devices may be embodied by the same hardware item. The use of the words first, second, and third, etc., does not indicate any order. These words may be interpreted as names.

Claims

1. A method for controlling the furnace pressure of a normalizing furnace, characterized in that: The method comprises: Obtaining the furnace pressure of the normalizing furnace; The furnace pressure is controlled to gradually increase along the running direction of the strip steel in the normalizing furnace.

2. The method for controlling the furnace pressure of a normalizing furnace according to claim 1, characterized in that: The normalizing furnace includes a preheating furnace, an open flame heating furnace, a furnace throat, a soaking furnace and a slow cooling furnace in sequence along the running direction of the steel strip, the furnace pressure includes the furnace pressure of the open flame heating furnace and the furnace pressure of the soaking furnace, and the controlling the furnace pressure to gradually increase along the running direction of the steel strip includes: The pressure difference of the furnace pressure in the soaking section minus the furnace pressure in the open flame heating section is controlled to be within a set pressure difference range.

3. The method for controlling the furnace pressure of a normalizing furnace according to claim 2, characterized in that: The step of controlling the pressure difference between the furnace pressure in the soaking section and the furnace pressure in the open flame heating section to be within a set pressure difference range includes: If the pressure difference of the furnace pressure in the soaking section minus the furnace pressure in the open flame heating section is lower than the lower limit of the pressure difference range, the flow rate of nitrogen introduced into the slow cooling section is increased; If the pressure difference of the furnace pressure in the soaking section minus the furnace pressure in the open flame heating section is higher than the upper limit of the pressure difference range, the flow rate of nitrogen introduced into the slow cooling section is reduced.

4. The method for controlling the furnace pressure of a normalizing furnace according to claim 1, characterized in that: The step of controlling the furnace pressure to gradually increase along the running direction of the strip steel in the normalizing furnace comprises: If the furnace pressure does not gradually increase along the running direction of the steel strip in the normalizing furnace, the pressure of the nitrogen introduced into the slow cooling section is increased so that the furnace pressure gradually increases along the running direction of the steel strip in the normalizing furnace.

5. The method for controlling the furnace pressure of a normalizing furnace according to claim 4, characterized in that: The step of increasing the pressure of the nitrogen gas introduced into the slow cooling section comprises: The pressure of the nitrogen gas introduced into the slow cooling section is increased by a set multiple.

6. A control device for normalizing furnace pressure, characterized in that: The device comprises: An acquisition module, used for acquiring the furnace pressure of the normalizing furnace; The control module is used to control the furnace pressure to gradually increase along the running direction of the strip steel in the normalizing furnace.

7. The control device for normalizing furnace pressure according to claim 6, characterized in that: The normalizing furnace includes a preheating furnace, an open flame heating furnace, a furnace throat, a soaking furnace and a slow cooling furnace in sequence along the running direction of the steel strip, the furnace pressure includes the open flame heating furnace pressure and the soaking furnace pressure, and the control module includes: The control unit is used to control the pressure difference of the furnace pressure in the soaking section minus the furnace pressure in the open flame heating section to be within a set pressure difference range.

8. The control device for normalizing furnace pressure according to claim 7, characterized in that: The control unit is also used for: If the pressure difference of the furnace pressure in the soaking section minus the furnace pressure in the open flame heating section is lower than the lower limit of the pressure difference range, the flow rate of nitrogen introduced into the slow cooling section is increased; If the pressure difference of the furnace pressure in the soaking section minus the furnace pressure in the open flame heating section is higher than the upper limit of the pressure difference range, the flow rate of nitrogen introduced into the slow cooling section is reduced.

9. An electronic device, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the method according to any one of claims 1 to 5 by executing the computer instructions.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable the computer to execute the method according to any one of claims 1 to 5.

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