Annealing furnace atmosphere control method, device, equipment and readable storage medium

Abstract

The embodiment of the present invention provides an annealing furnace atmosphere control method, device, equipment and readable storage medium. By obtaining a gas sample to be introduced into a target annealing furnace and determining the corresponding gas composition data based on the gas sample, the theoretical air-fuel ratio corresponding to the gas sample can be determined based on the gas composition data. Since the gas sample includes a target gas, the theoretical air-fuel ratio is first corrected based on the target gas and its preset range requirements, and the obtained first air-fuel ratio can be associated with the target gas. That is, once the target gas changes, the first air-fuel ratio will also change. Therefore, by using the first air-fuel ratio to control the combustion of the target annealing furnace, the atmosphere in the annealing furnace can be better controlled within a certain stable range, thereby solving the current technical problem of unstable atmosphere control in the annealing furnace.

Description

Technical Field

[0001] The present invention relates to the field of metallurgical technology, and in particular to an annealing furnace atmosphere control method, device, equipment and readable storage medium. Background Art

[0002] In the process of producing galvanized strip steel in hot-dip galvanizing production line, annealing furnace is used for surface annealing. When the horizontal direct-fired annealing furnace is heated, the atmosphere fluctuation in the direct-fired section is easy to cause the surface of the strip steel to be slightly oxidized. Once the slightly oxidized atmosphere is excessive, even if it is reduced in the soaking section, the strip steel is not easy to be reduced to spongy iron. Before the strip steel enters the pot, the adhesion of the zinc layer will deteriorate, resulting in zinc flow lines, dezincification and other defects.

[0003] Secondly, the stronger the reducing atmosphere is, the better it is. According to the reversible reaction theory, the higher the CO content, the more free carbon is produced, which is also not conducive to the quality of the strip surface. Moreover, when the reducing atmosphere is too strong, a large amount of residual combustible gas will gather in the preheating section and the flue for combustion, causing the exhaust gas temperature to exceed 860°C. If the heating capacity of the burner is limited at this time, the strip temperature will decrease, and zinc flow defects will occur.

[0004] Therefore, there is a need to stabilize the reducing atmosphere in the full direct-fired annealing furnace. Summary of the invention

[0005] The embodiments of the present invention provide an annealing furnace atmosphere control method, device, equipment and readable storage medium, thereby solving the technical problem of unstable atmosphere in the annealing furnace when controlling combustion in the annealing furnace in the prior art.

[0006] In a first aspect, the present invention provides an annealing furnace atmosphere control method through an embodiment of the present invention, comprising: obtaining a gas sample to be introduced into a target annealing furnace, and determining corresponding gas composition data based on the gas sample, so as to determine a theoretical air-fuel ratio corresponding to the gas sample based on the gas composition data; the gas sample comprises a target gas; based on the target gas and its preset range requirements, performing a first correction on the theoretical air-fuel ratio to obtain a first air-fuel ratio; and controlling the combustion of the target annealing furnace using the first air-fuel ratio.

[0007] As an optional implementation, after determining the theoretical air-fuel ratio corresponding to the gas sample based on the gas composition data, the method further includes: performing a second correction on the theoretical air-fuel ratio using a preset air excess coefficient to obtain a second air-fuel ratio.

[0008] As an optional implementation, performing the first correction on the theoretical air-fuel ratio to obtain the first air-fuel ratio includes: performing the second correction on the theoretical air-fuel ratio to obtain the second air-fuel ratio; performing the first correction on the second air-fuel ratio to obtain the first air-fuel ratio.

[0009] As an optional implementation, the target annealing furnace includes one or more combustion intervals, the preset excess air coefficient includes one or more sub-excess air coefficients, and each of the combustion intervals corresponds to a sub-excess air coefficient; the second air-fuel ratio includes one or more sub-air-fuel ratios;

[0010] The second correction of the theoretical air-fuel ratio to obtain the second air-fuel ratio includes: using the sub-air excess coefficient corresponding to each combustion interval to correct the theoretical air-fuel ratio of each combustion interval to obtain the corresponding sub-air-fuel ratio; and determining the second air-fuel ratio based on the sub-air-fuel ratio corresponding to each combustion interval.

[0011] As an optional implementation, the sub-air excess coefficient corresponding to each combustion interval is used to correct the theoretical air-fuel ratio of each combustion interval to obtain the corresponding sub-air-fuel ratio, including: obtaining the sub-air-fuel ratio of the corresponding combustion interval based on the product of the sub-air excess coefficient and the theoretical air-fuel ratio.

[0012] As an optional embodiment, performing the first correction on the second air-fuel ratio to obtain the first air-fuel ratio includes: utilizing the difference between the target gas and the lower limit value required in the preset range, the difference between the upper limit value required in the preset range and the lower limit value required in the preset range, and the preset air excess coefficient, to perform the first correction on the second air-fuel ratio to obtain the first air-fuel ratio.

[0013] In a second aspect, the present invention provides an annealing furnace atmosphere control device through an embodiment of the present invention, comprising:

[0014] a first calculation unit, configured to obtain a gas sample to be introduced into a target annealing furnace, and determine corresponding gas composition data based on the gas sample, so as to determine a theoretical air-fuel ratio corresponding to the gas sample based on the gas composition data; the gas sample includes a target gas;

[0015] a correction unit, configured to perform a first correction on the theoretical air-fuel ratio based on the target gas and a preset range requirement thereof, so as to obtain a first air-fuel ratio;

[0016] A combustion control unit is used to control the combustion of the target annealing furnace by using the first air-fuel ratio.

[0017] As an optional implementation manner, the correction unit is further used to: perform a second correction on the theoretical air-fuel ratio using a preset air excess coefficient to obtain a second air-fuel ratio.

[0018] In a third aspect, the present invention provides an annealing furnace atmosphere control device through an embodiment of the present invention, comprising a memory, a processor, and a code stored in the memory and executable on the processor, wherein when the processor executes the code, any one of the implementations of the first aspect described above is implemented.

[0019] In a fourth aspect, the present invention provides a computer-readable storage medium through an embodiment of the present invention, on which a computer program is stored, and when the computer program is executed by a processor, any implementation of the above-mentioned first aspect is implemented.

[0020] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0021] First, obtain a gas sample that is to enter the target annealing furnace, and determine the gas composition data corresponding to the gas sample based on the gas sample, so that the theoretical air-fuel ratio corresponding to the gas sample can be determined based on the gas composition data. Since the gas sample includes a target gas, the theoretical air-fuel ratio is first corrected based on the target gas and its preset range requirements, and the obtained first air-fuel ratio can be associated with the target gas. That is, once the target gas changes, the first air-fuel ratio will also change. Therefore, using the first air-fuel ratio to control the combustion of the target annealing furnace can better control the atmosphere in the annealing furnace within a certain stable range, thereby solving the current technical problem of unstable atmosphere control in the annealing furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 Flow chart of the annealing furnace atmosphere control method in an embodiment of the present invention;

[0024] Figure 2 A schematic diagram of the relationship between the theoretical calorific value and the corresponding theoretical air-fuel ratio of a gas sample in one implementation manner of the present invention;

[0025] Figure 3 A schematic diagram of the corresponding relationship between the correction coefficient of the preset excess air coefficient and the carbon monoxide content value in an implementation manner of an embodiment of the present invention;

[0026] Figure 4 Schematic diagram of the structure of the annealing furnace atmosphere control device in an embodiment of the present invention;

[0027] Figure 5 Schematic diagram of the structure of the annealing furnace atmosphere control device in an embodiment of the present invention;

[0028] Figure 6 Schematic diagram of a computer-readable storage medium structure in an embodiment of the present invention. DETAILED DESCRIPTION

[0029] The embodiments of the present invention provide an annealing furnace atmosphere control method, device, equipment and readable storage medium, thereby solving the technical problem of unstable atmosphere in the annealing furnace when controlling combustion in the annealing furnace in the prior art.

[0030] The technical solution provided by the embodiment of the present invention is to solve the above technical problems, and the overall idea is as follows:

[0031] First, a gas sample to be introduced into the target annealing furnace is obtained, and the gas composition data corresponding to the gas sample is determined based on the gas sample, so that the theoretical air-fuel ratio corresponding to the gas sample can be determined based on the gas composition data. Since the gas sample includes the target gas, the theoretical air-fuel ratio is first corrected based on the target gas and its preset range requirements, so that the obtained first air-fuel ratio is associated with the target gas. Finally, the first air-fuel ratio is used to control the combustion of the target annealing furnace.

[0032] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0033] First of all, the term "and / or" in this article is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0034] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein.

[0035] In the process of filing this application, the applicant discovered that: since galvanized steel strip, especially hot-dip zinc-aluminum-magnesium steel strip, has very high requirements for the stability of the atmosphere in the annealing furnace, the stability of the reducing atmosphere must be ensured in order to ensure the stability of the surface quality of the steel strip. In some optional implementations, the residual carbon monoxide content in the exhaust gas can be selected as an indicator of the stability of the atmosphere in the annealing furnace. The carbon monoxide content is mainly affected by factors such as the calorific value, air-fuel ratio and excess air coefficient of the atmosphere in the annealing furnace.

[0036] Generally, the combustible gas introduced into the annealing furnace is mainly coke oven gas, which may include hydrogen, methane, and carbon monoxide. In some embodiments, the annealing furnace may be a horizontal direct-fired annealing furnace, and the main gas introduced into the furnace is coke oven gas. It is not difficult to calculate the theoretical air-fuel ratio corresponding to each gas in the coke oven gas through the following reaction equation:

[0037] For hydrogen, the reaction equation is:

[0038]

[0039] Among them, 1 mole of H2 requires exactly 0.5 mole of O2 for complete combustion, so 2.387 moles of air are needed. The theoretical air-fuel ratio of H2 is calculated to be 2.387.

[0040] For methane, the reaction equation is:

[0041] CH4+2O2=2H2O+CO2

[0042] Among them, 1 mole of CH4 needs exactly 2 moles of O2 for complete combustion, so 9.547 moles of air are needed. The theoretical air-fuel ratio of CH4 is calculated to be 9.547.

[0043] For carbon monoxide, the reaction equation is:

[0044]

[0045] Among them, 1 mole of CO needs 0.5 mole of O2 to burn completely, so 2.387 moles of air are needed. The theoretical air-fuel ratio of CO is calculated to be 2.387.

[0046] For ethane, the reaction equation is:

[0047]

[0048] Among them, 1 mole of C2H6 requires 3.5 moles of O2 for complete combustion, so 16.708 moles of air are needed. The calculated theoretical air-fuel ratio of C2H6 is 16.708.

[0049] For ethylene, the reaction equation is:

[0050] C2H4+3O2=2H2O+2CO2

[0051] Among them, 1 mole of C2H4 needs exactly 3 moles of O2 to burn completely, so 14.321 moles of air are needed. The theoretical air-fuel ratio of C2H4 is calculated to be 14.321.

[0052] Through the above calculations of different fuel gases, it is not difficult to obtain the composition of coke oven gas. In some embodiments, the composition of coke oven gas and its air-fuel ratio and calorific value can be referred to as shown in the following Table 1:

[0053] Table 1. Composition of coke oven gas, its calorific value and air-fuel ratio

[0054]

[0055] However, in production practice, the atmosphere in the direct combustion section of the annealing furnace is always in a fluctuating state. The atmosphere fluctuation is mainly reflected in the fluctuation of the residual carbon monoxide and hydrogen content in the exhaust gas. The fluctuation of the carbon monoxide content is more obvious. Therefore, in practice, the combustion of the annealing furnace can be controlled according to the residual carbon monoxide content in the exhaust gas.

[0056] The embodiments of the present invention can be applied to hot-dip galvanizing production lines, especially to atmosphere control in annealing furnaces in hot-dip galvanizing production lines. The present invention mainly solves the problem of fluctuation of reducing atmosphere in the direct combustion section, and reduces the probability of defects such as zinc flow lines and dezincification in the strip by stabilizing the residual carbon monoxide value in the exhaust gas within the target range.

[0057] In a first aspect, an annealing furnace atmosphere control method provided by an embodiment of the present invention may include the following steps:

[0058] Step S101: obtaining a gas sample to be introduced into a target annealing furnace, and determining corresponding gas composition data based on the gas sample, so as to determine a theoretical air-fuel ratio corresponding to the gas sample based on the gas composition data.

[0059] Specifically, the fuel gas sample may include: carbon monoxide content value, methane content value, hydrogen content value, ethane content value and ethylene content value. Wherein, the fuel gas sample includes a target gas. In some optional embodiments, the target gas may be carbon monoxide generated after combustion of fuel gas in the annealing furnace.

[0060] In the specific implementation process, the gas composition data can be determined based on the theoretical calorific value of the gas sample, and the theoretical calorific value of the gas sample can be obtained using a calorimeter. The calorific value meter burns a small amount of gas sample, measures the temperature rise of the system air, and obtains the heat released during the combustion process to obtain the theoretical calorific value of the corresponding gas sample.

[0061] The calorimeter continuously measures a small amount of process gas. The heat generated by combustion causes the temperature to rise, which is transferred from the burner to the thermopile sensor through the cooling air source. When the heat rises, the thermopile sensor measures the electrical signal and converts it into the Wobbe index (kcal / Nm 3 ). The calorimeter calculates the theoretical calorific value of the gas sample based on the real-time Wobbe index and density specific gravity of the gas sample. The specific gravity sensor is built into the calorimeter, and the density specific gravity is generally the ratio of the gas density to the air density. In some optional embodiments, the calorimeter can be a combustion calorimeter.

[0062] For example, the theoretical calorific value of a gas sample can be calculated based on the following formula:

[0063]

[0064] Among them, Q is the corresponding theoretical calorific value, W is the corresponding Wobbe index, and B is the corresponding density ratio.

[0065] The calorific value meter can monitor the calorific value change of the atmosphere in the annealing furnace in real time, establish a relationship model between the theoretical calorific value and the theoretical air-fuel ratio, and then determine the theoretical air-fuel ratio change of the atmosphere according to the calorific value change of the atmosphere. In some optional embodiments, the relationship between the theoretical calorific value and the theoretical air-fuel ratio can be seen in the following Tables 2 and 3.

[0066] Table 2. A relationship between theoretical calorific value and theoretical air-fuel ratio

[0067]

[0068]

[0069] Table 3. Another relationship between theoretical calorific value and theoretical air-fuel ratio

[0070]

[0071] The fluctuation of theoretical calorific value of atmosphere in annealing furnace is mainly due to the fluctuation of composition among hydrogen, methane and carbon monoxide. Since the thermal base of hydrogen and carbon monoxide is not much different and their theoretical air-fuel ratio is the same, it can be assumed that the content of carbon monoxide remains unchanged. And since the proportion of ethane is small, the content of ethylene remains unchanged.

[0072] In one embodiment, if the content of hydrogen in the fuel gas sample to be introduced into the annealing furnace is X%, the content of carbon monoxide is 5%, the content of ethane is 1.9%, and the content of ethylene is 0.1%, then the content of methane is 83%-X%.

[0073] Combining the data in Table 2 and Table 3 above, the gas composition data corresponding to the gas sample can be obtained by calculating the theoretical calorific value corresponding to the gas sample. In some optional implementations, the theoretical calorific value corresponding to the gas sample can be calculated by the following formula:

[0074] Lo=[2.387X+(83-X)*9.547+2.387*5+16.708*1.9+14.321*0.1] / 100

[0075] Where Lo is the theoretical air-fuel ratio corresponding to the gas sample.

[0076] Then, the theoretical air-fuel ratio corresponding to the gas sample can be calculated by the following formula: LCVGas = [10790*X+35880*(83-X)+12640*5+71179*1.9+63400*0.1] / (100*4.186)

[0077] Where LCVGas is the theoretical calorific value of the gas sample, in kcal / Nm 3 .

[0078] Combining the above two formulas, it is not difficult to get:

[0079] Lo=0.001191457*LCVGas-0.7147397

[0080] Based on this, the relationship between the theoretical calorific value of the gas sample and the corresponding theoretical air-fuel ratio can be seen as follows: Figure 2 shown.

[0081] As an optional implementation, after determining the theoretical air-fuel ratio corresponding to the gas sample based on the gas composition data, it also includes: performing a second correction on the theoretical air-fuel ratio using a preset air excess coefficient to obtain a second air-fuel ratio.

[0082] Step S102: Based on the target gas and its preset range requirements, a first correction is made to the theoretical air-fuel ratio to obtain a first air-fuel ratio.

[0083] The less air passes through the surface of the strip, the less likely the strip is to be oxidized. If the amount of air passing through the surface of the strip is too high, the surface of the strip will be oxidized. During the galvanizing process, no intermediate inhibition layer is formed between the substrate and the zinc liquid, and the bonding strength between the zinc layer and the strip will become poor, resulting in defects such as zinc flow, dezincification, and missed plating.

[0084] However, if the amount of air passing through the surface of the strip is too small, the coke oven gas will not be able to burn completely, which will increase the amount of free carbon atoms. The free carbon atoms will float on the surface of the strip and reduce the adhesion between the zinc layer and the strip, which will also seriously affect the quality of the strip surface.

[0085] Therefore, when the theoretical air-fuel ratio is determined, in order to ensure excess coke oven gas in the annealing furnace, the theoretical air-fuel ratio must be multiplied by the excess air coefficient.

[0086] The applicant found that one condition for obtaining a reducing atmosphere is to increase the carbon monoxide content in the exhaust gas, and in order to increase the carbon monoxide content in the exhaust gas, the excess air coefficient must be less than 1. However, the smaller the excess air coefficient is, the better. When the excess air coefficient is less than 0.6, it is difficult to burn the coke oven gas, and the waste of coke oven gas is also very large.

[0087] In some optional implementations, the excess air coefficient may be any value between 0.86 and 0.96.

[0088] In the above step S102, the first correction is made to the theoretical air-fuel ratio to obtain the first air-fuel ratio, including: making a second correction to the theoretical air-fuel ratio to obtain the second air-fuel ratio; and making a first correction to the second air-fuel ratio to obtain the first air-fuel ratio.

[0089] Specifically, in an actual production process, the target annealing furnace may include one or more combustion zones, and the preset excess air coefficient may also include one or more sub-excess air coefficients, so that each combustion zone corresponds to a sub-excess air coefficient.

[0090] Since the coke oven gas in the downstream combustion zone burns more completely than that in the upstream combustion zone, in order to ensure that the reducing atmosphere becomes stronger and stronger, the excess air coefficient changes with the upstream and downstream relationship of the combustion zone. The closer to the downstream combustion zone, the smaller the corresponding sub-air excess coefficient.

[0091] In an optional implementation, if the target annealing furnace includes 8 combustion zones, which are zone 1, zone 2, zone 3, zone 4, zone 5, zone 6, zone 7 and zone 8 from top to bottom, the corresponding sub-air excess coefficient of each combustion zone can be shown in Table 4 below:

[0092] Table 4. Excess air coefficient corresponding to the combustion interval in one embodiment

[0093] Combustion range Zone 1 Zone 2 Zone 3 Zone 4 Zone 5 Zone 6 District 7 District 8 Excess air factor 0.96 0.95 0.94 0.92 0.90 0.90 0.89 0.88

[0094] Regarding how to make a second correction to the theoretical air-fuel ratio to obtain the second air-fuel ratio, specifically, the second air-fuel ratio includes one or more sub-air-fuel ratios. The theoretical air-fuel ratio of each combustion interval can be corrected using the sub-air excess coefficient corresponding to each combustion interval to obtain the corresponding sub-air-fuel ratio, and then the second air-fuel ratio is determined based on the sub-air-fuel ratio corresponding to each combustion interval.

[0095] In the specific implementation process, the sub-air-fuel ratio of the corresponding combustion interval can be obtained based on the product of the sub-air excess coefficient and the theoretical air-fuel ratio. If the annealing furnace has one combustion interval, the second air-fuel ratio is the sub-air-fuel ratio corresponding to the combustion interval; if the annealing furnace has multiple combustion intervals, the second air-fuel ratio includes multiple sub-air-fuel ratios. After calculating the sub-air-fuel ratios corresponding to all combustion intervals, the second air-fuel ratio can be the average of all sub-air-fuel ratios.

[0096] Regarding how to make a first correction to the second air-fuel ratio to obtain the first air-fuel ratio, specifically, the first correction can be made to the second air-fuel ratio by utilizing the difference between the target gas and the lower limit value required in the preset range, the difference between the upper limit value required in the preset range and the lower limit value required in the preset range, and the preset air excess coefficient to obtain the first air-fuel ratio.

[0097] In a specific implementation process, the target gas may be carbon monoxide, and the first air-fuel ratio may be calculated using the following formula:

[0098] Lo 实际 =Lo×α×λ

[0099] In the formula, Lo 实际 is the first air-fuel ratio, Lo is the theoretical air-fuel ratio, α is the correction coefficient of the preset air excess coefficient, and λ is the preset air excess coefficient.

[0100] Among them, the correction coefficient of the preset air excess coefficient can be set according to actual needs, or it can be calculated using the following formula:

[0101]

[0102] In the formula, r min is the lower limit of the preset range of carbon monoxide content, r max is the upper limit of the preset range of carbon monoxide content, r is the carbon monoxide content, α min is the lower limit of the correction coefficient of the preset air excess coefficient, α max It is the upper limit value of the correction factor of the preset air excess factor.

[0103] The upper and lower limits of the correction coefficient of the preset air excess coefficient can be set according to the actual application scenario. In one embodiment, the corresponding relationship between the correction coefficient of the preset air excess coefficient and the carbon monoxide content value can be seen as follows: Figure 3 shown.

[0104] For example, assuming that the preset range of the carbon monoxide content value is 2.5±0.5%, that is, 2.0-3.0%, the preset air excess coefficient is corrected according to the carbon monoxide content value in the annealing furnace. If the lower limit value of the correction coefficient of the preset air excess coefficient is 0.95 and the upper limit value of the correction coefficient of the preset air excess coefficient is 1.05, then the first air-fuel ratio of the annealing furnace is:

[0105]

[0106] Among them, Lo 实际 is the first air-fuel ratio, Lo is the theoretical air-fuel ratio, and λ is the preset air excess coefficient.

[0107] Step S103: Controlling the combustion of the target annealing furnace by using the first air-fuel ratio.

[0108] Based on the above step S102, the first air-fuel ratio (actual air-fuel ratio) of each combustion zone of the annealing furnace can be obtained, so that the actual air-fuel ratio can be associated with the residual carbon monoxide content in the exhaust gas, and the atmosphere in the annealing furnace can be dynamically adjusted to ensure that the carbon monoxide content value is within the corresponding preset range requirements.

[0109] Under the premise that the other control conditions of the annealing furnace remain unchanged, only the atmosphere control mode of the annealing furnace is changed. Before applying the atmosphere control method provided by the embodiment of the present invention, the proportion of defects such as zinc flow and dezincification on the strip steel on a certain galvanized strip steel production line is 1.27%. After applying the atmosphere control method provided by the embodiment of the present invention, the proportion of defects such as zinc flow and dezincification on the strip steel on the galvanized strip steel production line is reduced to 0.29%. It can be seen that the annealing furnace atmosphere control method provided by the embodiment of the present invention can significantly reduce the probability of defects such as zinc flow and dezincification, and ensure the stability of the quality of galvanized products.

[0110] In the second aspect, based on the same inventive concept, the present invention provides an annealing furnace atmosphere control device through an embodiment of the present invention, see Figure 4 As shown, the annealing furnace atmosphere control device may include:

[0111] The first calculation unit 401 is used to obtain a gas sample to be introduced into the target annealing furnace, and determine corresponding gas composition data based on the gas sample, so as to determine a theoretical air-fuel ratio corresponding to the gas sample based on the gas composition data; the gas sample includes the target gas.

[0112] The correction unit 402 is used to perform a first correction on the theoretical air-fuel ratio based on the target gas and its preset range requirement to obtain a first air-fuel ratio.

[0113] The combustion control unit 403 is used to control the combustion of the target annealing furnace by using the first air-fuel ratio.

[0114] As an optional implementation, the correction unit 402 is further used to: perform a second correction on the theoretical air-fuel ratio by using a preset air excess coefficient to obtain a second air-fuel ratio.

[0115] As an optional implementation, the correction unit 402 includes:

[0116] A first correction subunit, used for performing a second correction on the theoretical air-fuel ratio to obtain a second air-fuel ratio;

[0117] The second correction subunit is used to perform a first correction on the second air-fuel ratio to obtain a first air-fuel ratio.

[0118] As an optional implementation, if the target annealing furnace includes one or more combustion intervals, the preset air excess coefficient includes one or more sub-air excess coefficients, each combustion interval corresponds to a sub-air excess coefficient; the second air-fuel ratio includes one or more sub-air-fuel ratios; then the first correction subunit is specifically used to:

[0119] The theoretical air-fuel ratio of each combustion interval is corrected by using the sub-air excess coefficient corresponding to each combustion interval to obtain the corresponding sub-air-fuel ratio; and the second air-fuel ratio is determined based on the sub-air-fuel ratio corresponding to each combustion interval.

[0120] As an optional implementation manner, the first correction sub-unit obtains the sub-air-fuel ratio of the corresponding combustion interval based on the product of the sub-air excess coefficient and the theoretical air-fuel ratio.

[0121] As an optional implementation manner, the first correction subunit is specifically configured to:

[0122] The second air-fuel ratio is corrected by using the difference between the target gas and the preset range required lower limit value, the difference between the preset range required upper limit value and the preset range required lower limit value, and the preset air excess coefficient to obtain the first air-fuel ratio.

[0123] Since the annealing furnace atmosphere control device introduced in this embodiment is an electronic device used to implement the annealing furnace atmosphere control method in the embodiment of the present invention, based on the annealing furnace atmosphere control method introduced in the embodiment of the present invention, the technical personnel of the field can understand the specific implementation of the electronic device of the present embodiment and its various variations, so how the electronic device implements the method in the embodiment of the present invention is not described in detail here. As long as the technical personnel of the field implement the electronic device used in the annealing furnace atmosphere control method in the embodiment of the present invention, it belongs to the scope of protection of the present invention.

[0124] In a third aspect, based on the same inventive concept, an embodiment of the present invention provides an annealing furnace atmosphere control device.

[0125] refer to Figure 5 As shown, the annealing furnace atmosphere control device provided by the embodiment of the present invention includes: a memory 501, a processor 502 and a code stored in the memory and executable on the processor 502. When executing the code, the processor 502 implements any implementation of the annealing furnace atmosphere control method described above.

[0126] Among them, Figure 5 In the embodiment of the present invention, a bus architecture (represented by bus 500) is shown, which may include any number of interconnected buses and bridges, and bus 500 links various circuits including one or more processors represented by processor 502 and memory represented by memory 501. Bus 500 may also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and are therefore not further described herein. Bus interface 505 provides an interface between bus 500 and receiver 503 and transmitter 504. Receiver 503 and transmitter 504 may be the same element, namely a transceiver, providing a unit for communicating with various other devices over a transmission medium. Processor 502 is responsible for managing bus 500 and general processing, while memory 501 may be used to store data used by processor 502 when performing operations.

[0127] Fourthly, Figure 6 As shown, based on the same inventive concept, the present invention provides a computer-readable storage medium 600 through an embodiment of the present invention, on which a computer program 601 is stored. When the computer program 601 is executed by a processor, any implementation method of the annealing furnace atmosphere control method described above is implemented.

[0128] The technical solutions in the above embodiments of the present invention have at least the following technical effects or advantages:

[0129] By obtaining a gas sample that is to enter the target annealing furnace and determining the theoretical calorific value corresponding to the gas sample, the theoretical air-fuel ratio corresponding to the gas sample can be determined based on the theoretical calorific value. Since the gas sample includes a target gas, the theoretical air-fuel ratio is first corrected based on the target gas and its preset range requirements, and the obtained first air-fuel ratio can be associated with the target gas. That is, once the target gas changes, the first air-fuel ratio will also change. Therefore, by using the first air-fuel ratio to control the combustion of the target annealing furnace, the atmosphere in the annealing furnace can be better controlled within a certain stable range, thereby solving the current technical problem of unstable atmosphere control in the annealing furnace.

[0130] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable code.

[0131] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer instructions. These computer instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0132] These computer instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0133] These computer instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0134] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0135] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for controlling the atmosphere of an annealing furnace, characterized in that: include: Acquire a gas sample to be introduced into a target annealing furnace, and determine corresponding gas composition data based on the gas sample, so as to determine a theoretical air-fuel ratio corresponding to the gas sample based on the gas composition data; The gas sample includes a target gas; Performing a second correction on the theoretical air-fuel ratio by using a preset excess air coefficient to obtain a second air-fuel ratio; Based on the target gas and its preset range requirement, the second air-fuel ratio is corrected by a first correction using a difference between the target gas and a lower limit value of the preset range requirement, a difference between an upper limit value of the preset range requirement and a lower limit value of the preset range requirement, and the preset air excess coefficient to obtain a first air-fuel ratio; Combustion in the target annealing furnace is controlled using the first air-fuel ratio.

2. The method according to claim 1, characterized in that The target annealing furnace includes one or more combustion intervals, the preset excess air coefficient includes one or more sub-excess air coefficients, and each of the combustion intervals corresponds to a sub-excess air coefficient; the second air-fuel ratio includes one or more sub-air-fuel ratios; The performing the second correction on the theoretical air-fuel ratio to obtain the second air-fuel ratio includes: Using the sub-air excess coefficient corresponding to each combustion interval, the theoretical air-fuel ratio of each combustion interval is corrected to obtain the corresponding sub-air-fuel ratio; The second air-fuel ratio is determined based on the sub-air-fuel ratio corresponding to each of the combustion intervals.

3. The method according to claim 2, characterized in that The method of using the sub-air excess coefficient corresponding to each combustion interval to correct the theoretical air-fuel ratio of each combustion interval to obtain the corresponding sub-air-fuel ratio includes: Based on the product of the sub-air excess coefficient and the theoretical air-fuel ratio, a sub-air-fuel ratio corresponding to the combustion range is obtained.

4. A device for implementing the annealing furnace atmosphere control method according to any one of claims 1 to 3, characterized in that: include: A first calculation unit is used to obtain a gas sample to be introduced into a target annealing furnace, and determine corresponding gas composition data based on the gas sample, so as to determine a theoretical air-fuel ratio corresponding to the gas sample based on the gas composition data; The gas sample includes a target gas; Performing a second correction on the theoretical air-fuel ratio by using a preset excess air coefficient to obtain a second air-fuel ratio; a correction unit, configured to perform a first correction on the theoretical air-fuel ratio based on the target gas and its preset range requirement, using a difference between the target gas and a lower limit value of the preset range requirement, a difference between an upper limit value of the preset range requirement and a lower limit value of the preset range requirement, and a preset air excess coefficient, so as to obtain a first air-fuel ratio; A combustion control unit is used to control the combustion of the target annealing furnace by using the first air-fuel ratio.

5. The device according to claim 4, characterized in that The correction unit is further used for: The theoretical air-fuel ratio is corrected for a second time using a preset air excess coefficient to obtain a second air-fuel ratio.

6. An annealing furnace atmosphere control device, comprising a memory, a processor, and a code stored in the memory and executable on the processor, characterized in that: When the processor executes the code, the method according to any one of claims 1 to 3 is implemented.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 3 is implemented.

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