Annealing furnace and furnace pressure adjusting method, device and equipment of annealing furnace

Abstract

The invention discloses an annealing furnace and a furnace pressure adjusting method, device and equipment of the annealing furnace. The method comprises the steps that the current furnace pressure of the annealing furnace is obtained, the target opening degree corresponding to the current furnace pressure is determined according to the preset corresponding relation between the furnace pressure of the annealing furnace and a furnace pressure proportional valve, and the furnace pressure proportional valve is adjusted to the target opening degree; and the total waste gas amount in the smoke inlet pipeline is obtained, the target rotating speed of the smoke exhaust fan is determined according to the ratio of the total waste gas amount to a preset proportionality coefficient, the rotating speed of the smoke exhaust fan is adjusted to the target rotating speed, and the proportionality coefficient is the proportionality coefficient between the fan air volume and the rotating speed. According to the invention, linkage control can be carried out on the furnace pressure proportional valve and the smoke exhaust fan, so that the furnace pressure stability in the strip steel production process is ensured, and the product yield is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of strip steel production equipment control, and in particular, relates to an annealing furnace, an annealing furnace pressure regulating method, a device and equipment. Background Art

[0002] Hot-dip galvanized steel strip has the advantages of corrosion resistance and high strength, and is widely used in photovoltaic brackets, highway guardrails, livestock breeding towers, building trusses and other fields.

[0003] Annealing furnaces (such as horizontal annealing furnaces) are used to produce hot-dip galvanized steel strips. During the production process, the furnace pressure stability of the annealing furnace is an important part of improving the product yield of hot-dip galvanized steel strips. Therefore, it is necessary to control the furnace pressure of the annealing furnace to ensure production stability. Summary of the invention

[0004] The embodiments of the present application provide an annealing furnace, an annealing furnace pressure regulating method, a device and equipment, which ensure the stability of the furnace pressure during the strip production process and improve the product yield by linking the furnace pressure proportional valve and the smoke exhaust fan.

[0005] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by the practice of the present application.

[0006] According to a first aspect of an embodiment of the present application, a method for regulating furnace pressure of an annealing furnace is provided, wherein the annealing furnace comprises a rear burner zone, wherein the rear burner zone is provided with a furnace pressure proportional valve and a smoke exhaust fan, wherein the furnace pressure proportional valve is provided on a smoke inlet duct of the smoke exhaust fan, and the method comprises:

[0007] Acquire the current furnace pressure of the annealing furnace, determine the target opening corresponding to the current furnace pressure according to a preset correspondence between the furnace pressure of the annealing furnace and the furnace pressure proportional valve, and adjust the furnace pressure proportional valve to the target opening;

[0008] The total amount of exhaust gas in the smoke inlet pipeline is obtained, and the target speed of the smoke exhaust fan is determined according to the ratio between the total amount of exhaust gas and a preset proportional coefficient, and the speed of the smoke exhaust fan is adjusted to the target speed. The proportional coefficient is the proportional coefficient between the fan air volume and the speed.

[0009] Optionally, the annealing furnace includes a direct combustion section, a soaking section, and a hot tension roller chamber, and obtaining the current furnace pressure of the annealing furnace includes:

[0010] Respectively obtaining the detection furnace pressures of the direct combustion section, the soaking section, and the heat tensioning roller chamber;

[0011] Weight the detected furnace pressure based on a preset weight value to obtain a weighted furnace pressure, where the weight value of the direct combustion section is less than the weight value of the soaking section, and the weight value of the soaking section is less than the weight value of the hot tension roll chamber;

[0012] Take the mean value of each of the weighted furnace pressures as the current furnace pressure.

[0013] Optionally, the annealing furnace is used to heat the strip steel, and obtaining the total amount of waste gas in the flue gas inlet pipeline includes:

[0014] Obtain the gas flow rate required to heat the strip steel, the air-fuel ratio of gas to air, the proportion of nitrogen in the air, the proportion of each combustible gas in the gas, and the dilution air volume injected into the post-burner zone;

[0015] Weight the gas flow rate based on the proportion of each combustible gas in the gas to obtain a first waste gas volume, and weight the gas flow rate based on the ratio between the air-fuel ratio and the proportion of nitrogen to obtain a second waste gas volume;

[0016] Combine the first waste gas volume, the second waste gas volume, and the dilution air volume to obtain the total waste gas volume.

[0017] Optionally, after adjusting the speed of the exhaust gas fan to the target speed, the method further includes:

[0018] If the current furnace pressure is greater than or equal to a preset upper furnace pressure threshold value, obtain a first difference between the current furnace pressure and a preset lower corrected furnace pressure value, a second difference between a preset upper corrected furnace pressure value and the lower corrected furnace pressure value, and a preset upper corrected speed value;

[0019] Weight the first difference based on the upper corrected speed value to obtain a weighted difference, and take the ratio between the weighted difference and the second difference as the target corrected speed;

[0020] On the basis of the target speed, adjust the speed of the exhaust gas fan based on the target corrected speed.

[0021] Optionally, the annealing furnace includes a hot tension roll chamber, and the method further includes:

[0022] If the current furnace pressure is less than or equal to a preset lower furnace pressure threshold value, obtain a third difference between the lower furnace pressure threshold value and the detected furnace pressure of the hot tension roll chamber, a fourth difference between the lower furnace pressure threshold value and a preset dezincification risk furnace pressure value, and a preset upper nitrogen injection value;

[0023] Weight the ratio between the third difference and the fourth difference based on the upper nitrogen injection value to obtain a value of the nitrogen flow rate to be injected;

[0024] Inject nitrogen gas flow into the hot tension roller chamber according to the nitrogen gas flow value to be injected.

[0025] Optionally, a waste heat boiler and a boiler proportional valve are further provided in the post-burner area. The boiler proportional valve is arranged on the exhaust pipeline of the waste heat boiler. The method further includes:

[0026] Adjust the valve opening of the boiler proportional valve to 60%-70%.

[0027] According to a second aspect of the embodiments of the present application, there is provided a furnace pressure regulating device for an annealing furnace. The annealing furnace includes a post-burner area. A furnace pressure proportional valve and a smoke exhaust fan are arranged in the post-burner area. The furnace pressure proportional valve is arranged on the smoke inlet pipeline of the smoke exhaust fan. The device includes:

[0028] A first adjustment unit, configured to obtain the current furnace pressure of the annealing furnace, determine a target opening corresponding to the current furnace pressure according to a preset correspondence between the furnace pressure of the annealing furnace and the furnace pressure proportional valve, and adjust the furnace pressure proportional valve to the target opening;

[0029] A second adjustment unit, configured to obtain the total amount of waste gas in the smoke inlet pipeline, determine the target speed of the smoke exhaust fan according to the ratio between the total amount of waste gas and a preset proportionality coefficient, and adjust the speed of the smoke exhaust fan to the target speed. The proportionality coefficient is the proportionality coefficient between the air volume of the fan and the speed.

[0030] According to a third aspect of the embodiments of the present application, there is provided an annealing furnace, which includes:

[0031] A post-burner area, in which a furnace pressure proportional valve and a smoke exhaust fan are arranged. The furnace pressure proportional valve is arranged on the smoke inlet pipeline of the smoke exhaust fan;

[0032] A controller, communicatively connected to the furnace pressure proportional valve and the pressure exhaust fan, and configured to execute the method according to any one of the first aspect.

[0033] Optionally, the annealing furnace further includes:

[0034] A quickly-cooling section and a hot tension roller chamber which are connected to each other. A quickly-cooling fan is arranged in the quickly-cooling section. The quickly-cooling fan is provided with an air inlet and an air suction port. The air suction port is farther away from the hot tension roller chamber than the air inlet.

[0035] According to a fourth aspect of the embodiments of the present application, an electronic device includes one or more processors and one or more memories. At least one program code is stored in the one or more memories. The at least one program code is loaded and executed by the one or more processors to implement the operations performed by the method according to any one of the first aspect.

[0036] According to a fifth aspect of the embodiments of the present application, there is provided a computer-readable storage medium storing at least one computer program instruction, and the at least one computer program instruction is loaded and executed by a processor to implement the operations performed by the method according to any one of the first aspect.

[0037] One or more technical solutions provided by the embodiments of the present invention at least achieve the following technical effects or advantages:

[0038] In the annealing furnace furnace pressure regulation method of the present application, the annealing furnace includes a post-burner zone, and a furnace pressure proportional valve and an exhaust fan are arranged in the post-burner zone. The furnace pressure proportional valve is arranged on the smoke inlet pipeline of the exhaust fan. The method includes: obtaining the current furnace pressure of the annealing furnace, determining a target opening corresponding to the current furnace pressure according to a preset correspondence between the furnace pressure of the annealing furnace and the furnace pressure proportional valve, and adjusting the furnace pressure proportional valve to the target opening. Obtaining the total amount of waste gas in the smoke inlet pipeline, determining a target speed of the exhaust fan according to the ratio between the total amount of waste gas and a preset proportionality coefficient, and adjusting the speed of the exhaust fan to the target speed, where the proportionality coefficient is the proportionality coefficient between the air volume and the speed of the fan. Thus, the embodiments of the present application perform interlocking control on the furnace pressure proportional valve and the exhaust fan to ensure the stability of the furnace pressure during the strip production process and improve the product yield.

[0039] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The accompanying drawings herein are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application. Obviously, the accompanying drawings in the following description are only some embodiments of the present application, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts. In the drawings:

[0041] Figure 1 A schematic structural diagram of the annealing furnace according to the embodiment of the present application is shown;

[0042] Figure 2 A flowchart of the annealing furnace furnace pressure regulation method according to the embodiment of the present application is shown;

[0043] Figure 3 A structural diagram of the annealing furnace furnace pressure regulation device according to the embodiment of the present application is shown;

[0044] Figure 4 A schematic structural diagram of the fast cooling fan according to the embodiment of the present application is shown;

[0045] Figure 5The structural schematic diagram of a computer system of an electronic device suitable for implementing the embodiments of the present application is shown.

[0046] Among them, 1 - preheating section, 2 - direct combustion section, 3 - soaking section, 4 - rapid cooling section, 5 - hot tension roll chamber, 6 - afterburner, 7 - rapid cooling fan, 71 - air suction port, 72 - air inlet, 8 - hot air heat exchanger, 9 - bypass proportional valve, 10 - waste heat boiler, 11 - boiler proportional valve, 12 - furnace pressure proportional valve, 13 - exhaust fan, 14 - chimney. Detailed implementation manners

[0047] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0048] In addition, the described features, structures or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, many specific details are provided to give a full understanding of the embodiments of the present application. However, those skilled in the art will realize that the technical solutions of the present application can be practiced without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, well-known methods, devices, implementations or operations are not shown or described in detail to avoid obscuring various aspects of the present application.

[0049] The block diagrams shown in the drawings are only functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software form, or in one or more hardware modules or integrated circuits, or in different models and / or processor devices and / or microcontroller devices.

[0050] The flowcharts shown in the drawings are only illustrative and do not necessarily include all the contents and operations / steps, nor do they necessarily need to be executed in the described order. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined. Therefore, the actual execution order may be changed according to the actual situation.

[0051] It should also be noted that the terms "first", "second", etc. in the description, claims and drawings of the present application are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence. It should be understood that the objects used in this way can be interchanged under appropriate circumstances so that the embodiments of the present application described here can be implemented in an order other than those shown or described.

[0052] Hot-based galvanized strip steel (such as hot-dip galvanized strip steel based on the improved Sendzimir method) has a series of advantages such as corrosion resistance and high strength. It is widely used in fields such as photovoltaic brackets, highway guardrails, livestock breeding feed towers, and building trusses.

[0053] While the application scope of hot-based zinc-aluminum-magnesium strip steel products is expanding, users' requirements for product quality are also increasing day by day. It is understandable that zinc-aluminum-magnesium products are more prone to quality defects than ordinary galvanized products, so higher requirements are also placed on production equipment and production processes.

[0054] An annealing furnace (such as a horizontal annealing furnace) is used to produce hot-based galvanized strip steel. During the production process, the stability of the furnace pressure in the annealing furnace is an important link in improving the product yield of hot-based galvanized strip steel. For example: during normal production, the inside of the annealing furnace is a positive-pressure anaerobic environment, the inside of the furnace is filled with hydrogen, and it is in a reducing atmosphere, so the strip steel will not be oxidized; once the furnace pressure drops below 80 Pa, according to the gas penetration principle, the outside air seeps into the furnace along the furnace wall, causing the actual oxygen content inside the furnace to increase, oxidizing the strip steel, and thus triggering dezincification defects. Therefore, it is necessary to control the furnace pressure of the annealing furnace to ensure production stability and improve the product yield.

[0055] Figure 1 The structural schematic diagram of the annealing furnace according to the embodiment of the present application is shown.

[0056] As Figure 1 shown, the annealing furnace includes a preheating section 1, a direct-firing section 2, a soaking section 3, a rapid cooling section 4, and a hot tension roll chamber 5 connected in sequence according to the process section. The strip steel is processed through each of the above process sections in sequence; in addition, the strip steel also includes a post-burner area, which can be arranged at the furnace outlet section, the front end of the waste gas treatment system, etc., to process the combustible gas or waste gas escaping from the annealing process, ensure that these gases are completely burned to reduce environmental pollution, and recover part of the heat; or, pre-treat the waste gas before it enters more complex purification equipment to remove most of the combustible components and reduce the subsequent treatment burden.

[0057] In some embodiments, the post-burner area is arranged at the furnace outlet, and includes a post-burner 6, a hot air heat exchanger 8, a waste heat boiler 10, a smoke exhaust fan 13, and a chimney 14 that are sequentially away from the furnace outlet. Among them, the hot air heat exchanger 8 is connected to the waste heat boiler 10 through a pipeline on the one hand, and is connected to the smoke exhaust fan 13 through a bypass branch on the other hand. A bypass proportional valve 9 is arranged on the bypass branch; the waste heat boiler 10 is connected to the smoke exhaust fan 13 through a main pipeline (the smoke inlet pipeline of the smoke exhaust fan 13), and a boiler proportional valve 11 and a furnace pressure proportional valve 12 are arranged on the main pipeline. The main pipeline and the bypass branch are connected at the connection point. The boiler proportional valve 11 is located on one side of the connection point, and the furnace pressure proportional valve 12 is located on the other side of the connection point.

[0058] Figure 2 The flowchart of the annealing furnace pressure regulation method according to an embodiment of the present application is shown.

[0059] As Figure 2 shown, according to the first aspect of the embodiments of the present application, a method for regulating the pressure of an annealing furnace is provided. The method can be executed by a controller, and the method includes:

[0060] Step S10. Obtain the current pressure of the annealing furnace, determine the target opening corresponding to the current pressure according to the preset corresponding relationship between the pressure of the annealing furnace and the pressure ratio valve, and adjust the pressure ratio valve to the target opening;

[0061] It can be understood that in order to ensure the stability of strip production, the pressure of the annealing furnace should be maintained within a certain range, for example, within the range of 120 - 280 Pa. Therefore, when the pressure of the annealing furnace drops below 120 Pa or rises above 280 Pa, it is necessary to adjust the pressure of the annealing furnace to ensure the stability of strip production.

[0062] In some embodiments, the current pressure may be the current pressure of the direct combustion section, and the preset corresponding relationship between the pressure of the annealing furnace and the pressure ratio valve may be a corresponding relationship of closed-loop control established based on a proportional-integral-derivative (PID) controller. The specific establishment process of the corresponding relationship can refer to the related art and will not be elaborated here. The current pressure of the direct combustion section is used as the input of the proportional-integral-derivative controller, and the opening of the corresponding pressure ratio valve is calculated based on the preset corresponding relationship.

[0063] It can be understood that the pressure ratio valve can accurately adjust the gas flow rate through the exhaust fan according to the set value, which means it can quickly respond to the change of the pressure in the furnace and make corresponding adjustments. The proportional valve usually has good linear characteristics and can provide any opening between fully closed and fully open to achieve fine control of the gas flow rate. Usually, the proportional valve is used in cooperation with one or more pressure sensors, which monitor the actual pressure in the furnace and feed the data back to the controller. The controller adjusts the opening of the proportional valve according to the feedback information to keep the pressure in the furnace within a set target range. For example, when the external environment changes, the furnace door is opened or closed, or other process parameters change, the pressure in the furnace may fluctuate. The proportional valve can quickly respond and compensate for these changes by increasing or decreasing the exhaust volume to maintain a stable pressure in the furnace. In addition, if the pressure in the furnace is unstable, it may cause too much air to enter the furnace, resulting in oxidation of the strip surface and thus dezincification. By precisely controlling the atmosphere in the furnace, this risk can be effectively reduced.

[0064] In some embodiments, the annealing furnace includes a direct-fired section, a soaking section, and a hot tension roll chamber. Obtaining the current furnace pressure of the annealing furnace includes:

[0065] Step S101. Respectively obtain the detected furnace pressures of the direct-fired section, the soaking section, and the hot tension roll chamber;

[0066] Step S102. Weight the detected furnace pressures based on preset weights to obtain a weighted furnace pressure, where the weight of the direct-fired section is less than the weight of the soaking section, and the weight of the soaking section is less than the weight of the hot tension roll chamber;

[0067] Step S103. Take the mean value of each of the weighted furnace pressures as the current furnace pressure.

[0068] It can be understood that in some cases, due to the furnace pressures of each section of the horizontal furnace showing P NOF >P soaking >P HB , where P NOF represents the furnace pressure of the direct-fired section, P soaking represents the furnace pressure of the soaking section, and P HB represents the furnace pressure of the hot tension roll chamber. Since the furnace pressure of the hot tension roll chamber is the smallest, it is most likely that the furnace pressure fluctuates to a smaller value, such as below 80 Pa, resulting in the risk of strip dezincification. On this basis, the present application embodiment proposes a control strategy for the average furnace pressure as follows:

[0069]

[0070] Among them, Pi represents the mean value of the weighted furnace pressure, α represents the weighted value of the direct-fired section, β represents the weighted value of the soaking section, and γ represents the weighted value of the hot tension roll chamber. It can be understood that since the hot tension roll chamber causes the greatest risk of strip dezincification, the weighted value of the hot tension roll chamber is set to be the largest, that is, α < β < γ. Exemplarily, 0.7 < α < 1.0, 0.85 < β < 1.15, 1.0 < β < 1.3.

[0071] Step S20. Obtain the total amount of waste gas in the smoke inlet pipeline, determine the target speed of the exhaust fan according to the ratio between the total amount of waste gas and a preset proportionality coefficient, and adjust the speed of the exhaust fan to the target speed. The proportionality coefficient is the proportionality coefficient between the fan air volume and the speed.

[0072] In some embodiments, the annealing furnace is used to heat the strip. Obtaining the total amount of waste gas in the smoke inlet pipeline includes:

[0073] Step S201. Obtain the gas flow rate required for heating the strip steel, the air-fuel ratio of gas to air, the proportion of nitrogen in the air, the proportion of each combustible gas in the gas, and the dilution air volume injected into the post-burner zone;

[0074] Step S202. Weight the gas flow rate based on the proportion of each combustible gas in the gas to obtain the first waste gas volume, and weight the gas flow rate based on the ratio between the air-fuel ratio and the proportion of nitrogen to obtain the second waste gas volume;

[0075] Step S203. Combine the first waste gas volume, the second waste gas volume, and the dilution air volume to obtain the total waste gas volume.

[0076] It can be understood that assuming the flow rate of the NH mixture (air) injected into the furnace is Q1, the actual gas flow rate used for heating the strip steel is Q2, the air-fuel ratio is R, and the dilution air volume injected into the post-burner area is Q3.

[0077] Exemplarily, the fuel for the annealing furnace of the hot-dip galvanizing production line uses coke oven gas, whose main components include H2 (hydrogen), CH4 (methane), CO (carbon monoxide), C2H6 (ethane), C2H4 (ethylene), etc. The combustible gas reacts chemically with air to release heat. The composition of the desulfurized coke oven gas is shown in Table 1, and the chemical equation is shown in Formula (2). Each mole of H2, CH4, CO, C2H6, C2H4 requires 2.387 moles, 9.547 moles, 2.387 moles, 16.708 moles, and 14.321 moles of air for combustion respectively, and the corresponding air-fuel ratios are 2.387, 9.547, 2.387, 16.708, and 14.321 respectively.

[0078]

[0079] Table 1 Composition and calorific value of the second-phase coke oven gas

[0080]

[0081] As shown in Table 1, assuming the CO content is k, the proportion of H2 is x, the proportion of CH4 is y, the proportion of C2H6 is z, and the proportion of C2H4 is m. Then the air-fuel ratio R = [2.387x + 9.547y + 2.387k + 16.708z + 14.321m].

[0082] Then, the first exhaust gas volume Q2(2y + 4z + 3m) is obtained by weighting the gas flow based on the proportion of each combustible gas in the gas. The second exhaust gas volume R×Q2 / n is obtained by weighting the gas flow based on the ratio between the air-fuel ratio and the nitrogen proportion n. Combining the first exhaust gas volume, the second exhaust gas volume, and the dilution air volume, the total exhaust gas volume Q = Q2(2y + 4z + 3m) + R*Q2 / n + Q3.

[0083] Thus, the rotational speed ramp of the exhaust fan = [Q2*(2y + 4z + 3m) + R*Q2 / n + Q3] / k, where k represents the proportionality coefficient.

[0084] In some embodiments, after adjusting the rotational speed of the exhaust fan to the target rotational speed, the method further includes:

[0085] Step S301. If the current furnace pressure is greater than or equal to the preset upper furnace pressure threshold, obtain the first difference between the current furnace pressure and the preset lower corrected furnace pressure value, the second difference between the preset upper corrected furnace pressure value and the lower corrected furnace pressure value, and the preset upper corrected rotational speed value;

[0086] Step S302. Weight the first difference based on the upper corrected rotational speed value to obtain a weighted difference, and use the ratio between the weighted difference and the second difference as the target corrected rotational speed;

[0087] Step S303. Based on the target corrected rotational speed, adjust the rotational speed of the exhaust fan on the basis of the target rotational speed.

[0088] It should be noted that since the PID controller adjusts the furnace pressure proportional valve with a certain response time, there is a lag in the response of the PID controller. To prevent the furnace pressure from exceeding the upper furnace pressure threshold and causing a failure of the annealing furnace, for example, when it exceeds 300 Pa, the embodiment of the present application proposes a linkage control between the PID controller and the exhaust fan to compensate the rotational speed of the exhaust fan based on the input of the PID controller.

[0089] For ease of understanding, it will be described below by formula (3).

[0090]

[0091] Wherein, △r is the target correction rotational speed when the furnace pressure increases, s represents the preset upper limit value of the correction rotational speed (for example, 5%-10% of the maximum rotational speed of the exhaust fan), Pi is the input value of the PID controller (for example, the mean value of the weighted furnace pressure mentioned above), Pmin represents the lower limit value of the corrected furnace pressure (for example, 300 pa), and Pmax represents the upper limit value of the corrected furnace pressure (for example, 500 pa, that is, the correction of the furnace pressure cannot exceed this upper limit).

[0092] In some embodiments, the annealing furnace includes a hot tension roll chamber, and the method further includes:

[0093] Step S401. If the current furnace pressure is less than or equal to the preset lower threshold of the furnace pressure, obtain the third difference between the lower threshold of the furnace pressure and the detected furnace pressure of the hot tension roll chamber, the fourth difference between the lower threshold of the furnace pressure and the preset dezincification risk furnace pressure value, and the preset upper limit value of nitrogen injection;

[0094] Step S402. Weight the ratio between the third difference and the fourth difference based on the upper limit value of nitrogen injection to obtain the value of the nitrogen flow rate to be injected;

[0095] Step S403. Inject the nitrogen flow rate into the hot tension roll chamber according to the value of the nitrogen flow rate to be injected.

[0096] As described above, the hot tension roll chamber has the greatest risk of causing dezincification of the strip steel. Therefore, when the furnace pressure in the hot tension roll chamber drops to a certain range (for example, below 110 Pa), the nitrogen flow rate is increased into the hot tension roll chamber to make up for the trend of the furnace pressure decrease. The increased nitrogen flow rate is:

[0097]

[0098] Wherein, ΔQ N2 is the value of the nitrogen flow rate to be injected, Q N2-maximumflow represents the upper limit value of nitrogen injection (that is, not too much nitrogen can be injected and cannot exceed this upper limit value), P low value represents the lower threshold of the furnace pressure, that is, the starting value of the nitrogen flow rate that needs to be injected into the hot tension roll chamber. When the furnace pressure is lower than this lower threshold of the furnace pressure, nitrogen flow rate needs to be injected into the hot tension roll chamber, P minimumvalue represents the dezincification risk furnace pressure value, that is, when the strip steel has a dezincification risk when the furnace pressure is lower than this dezincification risk furnace pressure value.

[0099] In some embodiments, a waste heat boiler and a boiler proportional valve are further provided in the post-burner area, and the boiler proportional valve is arranged on the exhaust pipeline of the waste heat boiler. The method further includes:

[0100] Adjust the valve opening of the boiler proportional valve to 60%-70%, such as 60%, 65%, 70%, etc.

[0101] It can be understood that the boiler proportional valve can significantly improve the reduction of furnace pressure. Once this valve is fully opened during production, the gas in the furnace cannot maintain pressure, resulting in large fluctuations. Reducing the opening of the boiler proportional valve to between 60%-70% can ensure that the gas is stored in the furnace and the pressure is maintained; thus further realizing the stability of the furnace pressure.

[0102] Based on the above disclosed content, the embodiments of the present application implement PID control of the furnace pressure and the furnace pressure proportional valve according to the change of the furnace pressure; according to the flow rate of the NH mixed gas, the flow rates of air and gas, calculate the mathematical model (formula 2) of the flow rate after the chemical reaction, so as to determine the rotation speed of the induced draft fan. 3) Through the weighted control of the furnace pressure in the open flame section, soaking section and roller hearth furnace pressure, the purpose of increasing the roller hearth furnace pressure is achieved; through the linkage control of the PID control of the induced draft proportional valve and the rotation speed of the induced draft fan, the stable operation of the furnace pressure is realized; for the abnormal disturbance problem of the furnace pressure, a compensation strategy is formulated: measures such as increasing N2 to compensate the furnace pressure are taken to improve the anti-interference ability of the furnace pressure. After adopting the above embodiments, the furnace pressure fluctuation of the hot tensioning roller hearth furnace has increased from the original 5pa to 123pa to 101-159pa, the range of furnace pressure fluctuation has been reduced, the problem of dezincification caused by furnace pressure fluctuation has been solved, and the improvement effect on furnace pressure control is obvious.

[0103] Figure 3 The structure diagram of the annealing furnace pressure regulating device according to the embodiment of the present application is shown.

[0104] According to the second aspect of the embodiments of the present application, an annealing furnace pressure regulating device 200 is provided. The annealing furnace includes a post-burner area. The post-burner area is provided with a furnace pressure proportional valve and an induced draft fan. The furnace pressure proportional valve is arranged on the flue gas inlet pipeline of the induced draft fan. The device 200 includes:

[0105] The first adjustment unit 201 is configured to obtain the current furnace pressure of the annealing furnace, determine the target opening corresponding to the current furnace pressure according to the preset corresponding relationship between the furnace pressure of the annealing furnace and the furnace pressure proportional valve, and adjust the furnace pressure proportional valve to the target opening;

[0106] The second adjustment unit 202 is configured to obtain the total amount of waste gas in the flue gas inlet pipeline, determine the target rotation speed of the induced draft fan according to the ratio of the total amount of waste gas to a preset proportionality coefficient, and adjust the rotation speed of the induced draft fan to the target rotation speed. The proportionality coefficient is the proportionality coefficient between the fan air volume and the rotation speed.

[0107] Continue to refer to Figure 1, according to the third aspect of the embodiments of the present application, an annealing furnace is provided, and the annealing furnace includes:

[0108] A post-burner zone, where a furnace pressure proportional valve 12 and an exhaust fan 13 are provided. The furnace pressure proportional valve 12 is arranged on the smoke inlet pipe of the exhaust fan 13;

[0109] A controller (not shown), which is communicatively connected to the furnace pressure proportional valve 12 and the exhaust pressure fan, and is used to execute the method described in any one of the first aspect.

[0110] Figure 4 The structural schematic diagram of the rapid cooling fan according to the embodiments of the present application is shown.

[0111] In some embodiments, the annealing furnace further includes:

[0112] A rapid cooling section 4 and a hot tensioning roll chamber 5 that are interconnected. The rapid cooling section 4 is provided with a rapid cooling fan 7. The rapid cooling fan 7 is provided with an air inlet 72 and an air suction port 71. The air suction port 71 is farther away from the hot tensioning roll chamber 5 than the air inlet 72.

[0113] It should be noted that in the traditional air suction port, it is closer to the hot tensioning roll chamber than the air inlet. Since the pressure in the roll chamber area is about 90 Pa, the gas in the roll chamber is easily absorbed by the air suction port, resulting in a decrease in the pressure in the roll chamber area, for example, dropping below 80 Pa, thus there is a risk of dezincification.

[0114] In the embodiments of the present application, the air suction port is arranged farther away from the hot tensioning roll chamber than the air inlet, so that the pressure in the roll chamber significantly rises to 140 Pa, thereby improving the current situation of the furnace pressure in the rapid cooling and roll chamber areas by changing the position of the air suction port.

[0115] According to the fourth aspect of the embodiments of the present application, an electronic device includes one or more processors and one or more memories. At least one program code is stored in the one or more memories, and the at least one program code is loaded and executed by the one or more processors to implement the operations performed by the method described in any one of the first aspect.

[0116] As Figure 5 shown, the electronic device 400 is presented in the form of a general computing device. The components of the electronic device 400 may include, but are not limited to: the above-mentioned at least one processing unit 410, the above-mentioned at least one storage unit 420, and a bus 430 connecting different system components (including the storage unit 420 and the processing unit 410).

[0117] Among them, the storage unit stores program code that can be executed by the processing unit 410, so that the processing unit 410 executes the steps according to various exemplary embodiments of the present application described in the "Embodiment Method" section of this specification.

[0118] The storage unit 420 may include a readable medium in the form of a volatile storage unit, such as a random access storage unit (RAM) 421 and / or a cache 422, and may further include a read-only storage unit (ROM) 423.

[0119] The storage unit 420 may further include a program / utilities 424 having a set (at least one) of program modules 425. Such program modules 425 include, but are not limited to: an operating system, one or more application programs, other program modules, and program data. Each or some combination of these examples may include an implementation of a network environment.

[0120] The bus 430 may represent one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, a processing unit, or a local bus using any of a variety of bus structures.

[0121] The electronic device 400 may also communicate with one or more external devices 500 (such as a keyboard, a pointing device, a Bluetooth device, etc.), may also communicate with one or more devices that enable a user to interact with the electronic device 400, and / or communicate with any device that enables the electronic device 400 to communicate with one or more other computing devices (such as a router, a modem, etc.). Such communication may be performed through an I / O (input / output) interface 450. Among them, the I / O interface 450 may also be connected to the display unit 440 to display the communication content through the display unit 440. In addition, the electronic device 400 may also communicate with one or more networks (such as a local area network (LAN), a wide area network (WAN), and / or a public network, such as the Internet) through a network adapter 460. As shown in the figure, the network adapter 460 communicates with other modules of the electronic device 400 through the bus 430. It should be understood that although not shown in the figure, other hardware and / or software modules may be used in combination with the electronic device 400, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems, etc.

[0122] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted via a computer-readable medium as one or more instructions or code. Other examples and implementations are within the scope and spirit of the present invention and the appended claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hardwiring, or any combination thereof. In addition, each functional unit may be integrated in one processing unit, may exist separately as individual physical units, or two or more units may be integrated in one unit.

[0123] In several embodiments provided in the present application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are merely illustrative. For example, the division of units can be a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the couplings or direct couplings or communication connections shown or discussed with each other can be through some interfaces. The indirect couplings or communication connections of units or modules can be in electrical or other forms.

[0124] The units described as separate components may or may not be physically separated. The components serving as control devices may or may not be physical units, that is, they may be located in one place or distributed to multiple units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0125] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods of the various embodiments of the present invention. The aforementioned storage medium includes: USB flash drives, read-only memories (ROMs), random access memories (RAMs), mobile hard disks, magnetic disks, or optical discs, etc., which can store program codes.

[0126] According to a fifth aspect of the embodiments of the present application, there is provided a computer-readable storage medium storing at least one computer program instruction, and the at least one computer program instruction is loaded and executed by a processor to implement the operations performed by the method according to any one of the first aspect.

[0127] The computer-readable storage medium may be a portable compact disc read-only memory (CD-ROM) and includes program code, and may be run on a terminal device such as a personal computer. However, the computer-readable storage medium of the present application is not limited thereto. In the present application, the readable storage medium may be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0128] The readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the above. More specific examples of the readable storage medium (a non-exhaustive list) include: an electrical connection having one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0129] The program code for performing the operations of the present application may be written in any combination of one or more programming languages, including object-oriented programming languages such as Java, C++, etc., and also including conventional procedural programming languages such as the "C" language or similar programming languages. The program code may be executed entirely on the user's computing device, partially on the user's device, executed as a stand-alone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server. In the case of a remote computing device, the remote computing device may be connected to the user's computing device through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computing device (e.g., by connecting through an Internet service provider via the Internet).

[0130] The above are only the embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims

1. A method for regulating the furnace pressure of an annealing furnace, characterized in that: The annealing furnace comprises a rear burner zone, the rear burner zone is provided with a furnace pressure proportional valve and a smoke exhaust fan, the furnace pressure proportional valve is provided on a smoke inlet pipe of the smoke exhaust fan, and the method comprises: Acquire the current furnace pressure of the annealing furnace, determine the target opening corresponding to the current furnace pressure according to a preset correspondence between the furnace pressure of the annealing furnace and the furnace pressure proportional valve, and adjust the furnace pressure proportional valve to the target opening; The total amount of exhaust gas in the smoke inlet pipeline is obtained, and the target speed of the smoke exhaust fan is determined according to the ratio between the total amount of exhaust gas and a preset proportional coefficient, and the speed of the smoke exhaust fan is adjusted to the target speed. The proportional coefficient is the proportional coefficient between the fan air volume and the speed.

2. The method according to claim 1, characterized in that The annealing furnace includes a direct combustion section, a soaking section and a hot tension roller chamber, and the obtaining of the current furnace pressure of the annealing furnace includes: Respectively obtaining the detection furnace pressures of the direct combustion section, the soaking section, and the heat tensioning roller chamber; The detected furnace pressure is weighted based on a preset weight to obtain a weighted furnace pressure, wherein the weight of the direct combustion section is smaller than the weight of the soaking section, and the weight of the soaking section is smaller than the weight of the heat tension roller chamber; The average of the weighted furnace pressures is used as the current furnace pressure.

3. The method according to claim 1, characterized in that The annealing furnace is used to heat the steel strip, and the obtaining of the total amount of exhaust gas in the smoke inlet pipeline includes: Obtaining the gas flow rate required for heating the steel strip, the air-fuel ratio of gas to air, the proportion of nitrogen in the air, the proportion of each combustible gas in the gas, and the dilution air volume injected into the post-burner zone; The coal gas flow is weighted based on the proportion of each combustible gas in the coal gas to obtain a first exhaust gas volume, and the coal gas flow is weighted based on the ratio between the air-fuel ratio and the nitrogen ratio to obtain a second exhaust gas volume; The total amount of exhaust gas is obtained by combining the first exhaust gas amount, the second exhaust gas amount and the dilution air volume.

4. The method according to claim 1, characterized in that After adjusting the speed of the smoke exhaust fan to the target speed, the method further includes: If the current furnace pressure is greater than or equal to the preset furnace pressure upper limit threshold, then obtaining a first difference between the current furnace pressure and a preset corrected furnace pressure lower limit value, a second difference between a preset corrected furnace pressure upper limit value and the corrected furnace pressure lower limit value, and a preset corrected speed upper limit value; weighting the first difference based on the modified speed upper limit to obtain a weighted difference, and taking the ratio between the weighted difference and the second difference as the target modified speed; On the basis of the target rotational speed, the rotational speed of the smoke exhaust fan is adjusted based on the target corrected rotational speed.

5. The method according to claim 1, characterized in that The annealing furnace includes a heat tensioning roller chamber, and the method further includes: If the current furnace pressure is less than or equal to a preset furnace pressure lower limit threshold, a third difference between the furnace pressure lower limit threshold and the detected furnace pressure of the hot tension roller chamber, a fourth difference between the furnace pressure lower limit threshold and a preset dezincification risk furnace pressure value, and a preset nitrogen injection upper limit value are obtained; Weighting the ratio between the third difference and the fourth difference based on the nitrogen injection upper limit value to obtain a flow value of the nitrogen to be injected; Inject nitrogen flow into the heat tensioning roller chamber according to the flow value of the nitrogen to be injected.

6. The method according to claim 1, characterized in that The post-burner zone is further provided with a waste heat boiler and a boiler proportional valve, and the boiler proportional valve is provided on an exhaust pipe of the waste heat boiler. The method further comprises: The valve opening of the boiler proportional valve is adjusted to 60%-70%.

7. An annealing furnace pressure regulating device, characterized in that: The annealing furnace comprises a rear burner zone, the rear burner zone is provided with a furnace pressure proportional valve and a smoke exhaust fan, the furnace pressure proportional valve is arranged on the smoke inlet pipe of the smoke exhaust fan, and the device comprises: a first regulating unit, configured to obtain a current furnace pressure of the annealing furnace, determine a target opening corresponding to the current furnace pressure according to a preset corresponding relationship between the furnace pressure of the annealing furnace and the furnace pressure proportional valve, and regulate the furnace pressure proportional valve to the target opening; The second regulating unit is used to obtain the total amount of exhaust gas in the smoke inlet pipeline, determine the target speed of the smoke exhaust fan according to the ratio between the total amount of exhaust gas and a preset proportional coefficient, and adjust the speed of the smoke exhaust fan to the target speed, wherein the proportional coefficient is the proportional coefficient between the fan air volume and the speed.

8. An annealing furnace, characterized in that: The annealing furnace comprises: A rear burner zone, wherein the rear burner zone is provided with a furnace pressure proportional valve and a smoke exhaust fan, and the furnace pressure proportional valve is arranged on a smoke inlet pipe of the smoke exhaust fan; A controller is communicatively connected with the furnace pressure proportional valve and the exhaust pressure fan, and is used to execute the method according to any one of claims 1 to 6.

9. The annealing furnace according to claim 8, characterized in that: The annealing furnace also includes: The quick cooling section and the hot tension roller chamber are connected to each other, the quick cooling section is provided with a quick cooling fan, the quick cooling fan is provided with an air inlet and an air suction port, and the air suction port is farther away from the hot tension roller chamber than the air inlet.

10. An electronic device, characterized in that: The method comprises one or more processors and one or more memories, wherein at least one program code is stored in the one or more memories, and the at least one program code is loaded and executed by the one or more processors to implement the operations performed by the method according to any one of claims 1 to 6.

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