Regulation and control method and regulation and control device for slag iron capacity of blast furnace hearth

Abstract

The invention discloses a method and a device for regulating and controlling slag and iron capacity of a blast furnace hearth. The regulation and control method comprises the steps that when a working iron notch cannot be normally opened, slag iron production parameters in a set time period are determined, and the set time period is the time period from the moment when the working iron notch is closed last time to the current moment; according to the slag iron production parameters and the maximum slag iron capacity of the hearth, determining the time required for increasing the slag iron in the blast furnace to the maximum slag iron capacity of the hearth; determining the fault processing duration for solving the working iron notch fault; determining whether the required duration is greater than or equal to the fault processing duration; if yes, controlling the furnace inlet air pressure of the blast furnace not to exceed the set air pressure; if not, the air volume in the blast furnace is controlled to be reduced by the set air volume value per minute. According to the regulation and control method and device for the slag and iron capacity of the blast furnace hearth, under the condition that the safety of the blast furnace hearth is ensured, the yield loss and the cost loss of the blast furnace when a working iron notch is abnormal and slag and iron cannot be discharged are reduced to the maximum extent.

Description

Technical Field

[0001] The invention relates to the technical field of blast furnace ironmaking, and in particular to a method and a device for controlling the amount of slag and iron contained in a blast furnace hearth. Background Art

[0002] During the blast furnace production process, the slag iron discharged from the iron mouth and the slag iron generated in the blast furnace are basically in a balanced state, which is a necessary condition for the normal production of the blast furnace. The slag iron generated by blast furnace smelting needs to be discharged from the iron mouth regularly. Once the balance is broken, it will inevitably lead to abnormal blast furnace production and deterioration of various production indicators.

[0003] At present, no matter how many tapholes there are in domestic blast furnaces, generally only one taphole can work alone. In the single taphole state, there are many factors that cannot open the taphole normally, such as leakage of slag iron groove, damage to tapping machine, damage to hydraulic gun, etc. Each major abnormality takes dozens of minutes or even hours to handle.

[0004] Once the amount of slag iron generated in the furnace is too much and cannot be removed in time, it is easy to cause safety accidents such as furnace burn-through and explosion. Therefore, under the existing technical conditions, when the iron mouth equipment and slag iron groove are abnormal before the iron mouth is opened, the blast furnace operator first considers reducing the air and oxygen to alleviate the slag iron generation rate in exchange for time to deal with the iron mouth abnormality, thereby ensuring the safety of the furnace. In order to ensure safety, the blast furnace operators all reduce the air volume entering the furnace to the minimum, stop oxygen operation, and reduce the risk at the slowest slag iron generation rate. Such operations will inevitably lead to increased blast furnace consumption, reduced output, and increased costs. In addition, when it is unclear when the iron mouth can be restored, the safety risk of the furnace is still increasing.

[0005] Usually, slag is on the upper surface of molten iron. When the slag cannot be discharged smoothly and a large amount of slag accumulates, as the molten iron level rises, the slag can easily enter the blast furnace tuyere area, causing the blast furnace tuyere to burn through. At present, there is no corresponding control method for the slag generated in the furnace when the iron mouth cannot be opened, so that operators generally operate based on experience, which leads to a very passive blast furnace production as the troubleshooting time is prolonged. Summary of the invention

[0006] The present invention provides a method and device for controlling the slag and iron capacity of a blast furnace hearth, which minimizes the blast furnace output loss and cost loss when the working iron mouth abnormally cannot discharge slag and iron under the condition of ensuring the safety of the blast furnace hearth.

[0007] According to one aspect of the present invention, a method for regulating the amount of slag and iron in a blast furnace hearth is provided, the method comprising:

[0008] When the working iron mouth cannot be opened normally, determining the slag iron production parameters within a set time period, wherein the set time period is a time period from the moment when the working iron mouth was closed last time to the current moment;

[0009] Determine the time required for the slag in the blast furnace to increase to the maximum slag capacity of the furnace according to the slag production parameters and the maximum slag capacity of the furnace;

[0010] Determine the troubleshooting time for resolving the working iron mouth trouble;

[0011] Determine whether the required time is greater than or equal to the fault handling time;

[0012] If yes, then controlling the inlet air pressure of the blast furnace not to exceed the set air pressure;

[0013] If not, the air volume in the blast furnace is controlled to decrease by a set air volume value per minute.

[0014] Optionally, the slag iron production parameters include the slag iron production speed of the blast furnace within the set time period and the slag iron amount of the blast furnace at the current moment;

[0015] The step of determining the time required for the slag in the blast furnace to increase to the maximum slag capacity of the furnace according to the slag production parameters and the maximum slag capacity of the furnace comprises:

[0016] Determine the blast furnace slag iron increase amount according to the difference between the maximum slag iron capacity of the furnace and the blast furnace slag iron amount at the current moment;

[0017] The required time is determined according to the increase in the blast furnace slag and the slag production speed.

[0018] Optionally, the set wind pressure includes the inlet wind pressure of the blast furnace before the working iron mouth cannot be opened normally.

[0019] Optionally, before controlling the air volume in the blast furnace to reduce a set air volume value per minute, the method includes:

[0020] Determine the unit air consumption of blast furnace;

[0021] The set air volume value is determined according to the slag iron production parameters, the blast furnace air consumption, the required time and the fault handling time.

[0022] Optionally, the determining, according to the slag production parameters and the maximum slag capacity of the furnace, the time required for the slag in the blast furnace to increase to the maximum slag capacity of the furnace includes:

[0023] Establish a calculation model for slag storage in the furnace when the blast furnace cannot discharge slag;

[0024] The maximum slag and iron capacity of the furnace is determined according to the calculation model for storing slag and iron in the furnace.

[0025] Optionally, the establishment of a calculation model for storing slag in a furnace when the blast furnace is unable to discharge slag includes:

[0026] The calculation model for storing slag in the hearth is determined according to the effective volume of the hearth, the safety factor of the blast furnace, the volume coefficient of the hearth, the density of molten iron and the density of slag.

[0027] Optionally, the furnace storage slag iron calculation model is determined by the following formula:

[0028] M=((V*φ1)+(V*φ2))*γ*Ψ;

[0029] Wherein, M represents the maximum slag and iron capacity of the furnace, V represents the effective volume of the furnace, φ1 represents the density of molten iron, φ2 represents the density of slag and iron, γ represents the safety factor of the blast furnace, and Ψ represents the volume coefficient of the furnace.

[0030] Optionally, when the required time is greater than or equal to the fault handling time, a spare iron mouth is mined.

[0031] Optionally, when the fault handling duration cannot be determined, the input of enriched oxygen into the blast furnace is stopped, the air volume in the blast furnace is reduced to a minimum value, and preparations for a wind stop are made for the blast furnace.

[0032] According to another aspect of the present invention, a device for controlling the amount of slag and iron in a blast furnace hearth is provided, the device comprising: a slag and iron parameter determination module, a duration determination module, a comparison module and a control module;

[0033] The slag iron parameter determination module is used to determine the slag iron production parameters within a set time period when the working iron mouth cannot be opened normally, wherein the set time period is the time period from the moment when the working iron mouth was closed last time to the current moment;

[0034] The duration determination module is used to determine the time required for the slag in the blast furnace to increase to the maximum slag capacity of the furnace according to the slag production parameters and the maximum slag capacity of the furnace, and to determine the fault handling time for solving the working iron mouth fault;

[0035] The comparison module is used to determine whether the required time is greater than or equal to the fault processing time;

[0036] The control module is used to control the inlet air pressure of the blast furnace not to exceed the set air pressure when the required time is greater than or equal to the fault handling time, and to control the air volume in the blast furnace to reduce the set air volume value per minute when the required time is less than the fault handling time.

[0037] The embodiment of the present invention provides a method for regulating the slag iron capacity of a blast furnace hearth, the method comprising: when the working iron mouth cannot be opened normally, determining the slag iron production parameters within a set time period, then determining the required time for the slag iron in the blast furnace to increase to the maximum slag iron capacity of the hearth according to the slag iron production parameters and the maximum slag iron capacity of the hearth, and determining the fault handling time for solving the working iron mouth fault. Then determine whether the required time is greater than or equal to the fault handling time, and when the required time is greater than or equal to the fault handling time, control the furnace inlet wind pressure of the blast furnace not to exceed the set wind pressure, and the set wind pressure can be the original furnace inlet wind pressure, so as to ensure that when the working iron mouth cannot be opened normally, the iron production of the blast furnace is still not reduced. When the required time is less than the fault handling time, control the air volume in the blast furnace to reduce the set air volume value per minute, so as to appropriately reduce the air volume in the blast furnace before the working iron mouth can be opened, thereby reducing the amount of slag iron produced by the blast furnace, which can avoid the oxygen stop operation of the blast furnace, and can also avoid the slag iron amount in the blast furnace reaching the maximum slag iron capacity of the hearth before the working iron mouth is opened. Compared with the prior art which simply stops oxygen operation when the working iron mouth cannot be opened, the method for controlling the slag and iron capacity of the blast furnace hearth provided in this embodiment can take corresponding measures according to the specific circumstances, while ensuring the safety of the blast furnace hearth, minimizing the blast furnace production loss and cost loss when the working iron mouth abnormally cannot discharge slag and iron.

[0038] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] 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 only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 It is a schematic flow chart of a method for controlling the amount of slag and iron in a blast furnace hearth provided in accordance with an embodiment of the present invention;

[0041] Figure 2 The present invention is a schematic structural diagram of a device for controlling the amount of slag and iron in a blast furnace hearth provided in accordance with an embodiment of the present invention. DETAILED DESCRIPTION

[0042] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0043] 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 data 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. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0044] Figure 1 is a flow chart of a method for controlling the amount of slag and iron in a blast furnace according to an embodiment of the present invention, with reference to Figure 1 The control method provided in this embodiment comprises the following steps:

[0045] S110. When the working tap hole cannot be opened normally, determine the slag iron production parameters within a set time period, wherein the set time period is a time period from the last time the working tap hole was closed to the current time.

[0046] Specifically, the working iron mouth refers to the iron mouth used to discharge slag. The current moment refers to the moment when it is found that the working iron mouth cannot be opened normally. When the working iron mouth cannot be opened normally, the slag in the blast furnace will not be able to be discharged. At this time, the time period from the last time the working iron mouth was closed to the time when the working iron mouth cannot be opened currently (that is, the set time period) is determined, and the slag production parameters within the set time period are determined. The slag production parameters may include the amount of blast furnace slag M1 produced by the blast furnace within the set time period t2, and the slag production speed S1 produced by the blast furnace per minute within the set time period. The slag production speed S1 may be: S1=M1 / t2.

[0047] When the working taphole was opened last time, all the slag in the blast furnace could be discharged. Therefore, the amount of slag M1 produced by the blast furnace in the set time period t2 can be the amount of slag M1 in the blast furnace at the current moment. The amount of slag M1 produced by the blast furnace in the set time period t2 can be calculated based on the coal consumption and oxygen consumption of the blast furnace.

[0048] S120, determining the time required for the slag in the blast furnace to increase to the maximum slag capacity of the furnace according to the slag production parameters and the maximum slag capacity of the furnace.

[0049] Specifically, the maximum slag iron capacity of the furnace is recorded as M. When the working iron mouth cannot be opened normally, the blast furnace slag iron amount M1 in the blast furnace at the current moment is determined, and the time required for the slag iron amount in the blast furnace to increase from M1 to the maximum slag iron capacity M of the furnace is determined. The required time t3 can be determined according to the slag iron production speed S1, the blast furnace slag iron amount M1 in the blast furnace at the current moment, and the maximum slag iron capacity M of the furnace. For example, the required time t3 can be determined according to the following formula:

[0050] t3 = (M-M1) / S1.

[0051] S130, determining the fault handling time for resolving the working iron mouth fault.

[0052] Specifically, if the working iron mouth cannot be opened normally, it means that there is a fault in the working iron mouth. At this time, find out the fault type of the working iron mouth fault, and determine the time to solve the fault so that the working iron mouth can be opened normally according to the fault type, that is, the fault handling time t1.

[0053] S140: Determine whether the required time is greater than or equal to the fault handling time.

[0054] The required time t3 is compared with the fault processing time t1. If it is determined that the required time t3 is greater than or equal to the fault processing time t1, step S150 is executed; if it is determined that the required time t3 is less than the fault processing time t1, step S160 is executed.

[0055] S150, control the air pressure entering the blast furnace not to exceed the set air pressure.

[0056] Specifically, when the required time is greater than or equal to the fault handling time, it means that when the fault handling of the working iron mouth is completed, the amount of slag and iron in the blast furnace will not exceed the maximum slag and iron capacity M of the furnace. Therefore, when the required time is greater than or equal to the fault handling time, the working state of the blast furnace can be controlled unchanged, that is, the slag production speed of the blast furnace can continue to be maintained at S1, the oxygen stop operation does not need to be performed, and the amount of air entering the furnace can be reduced to a minimum, thereby not reducing the blast furnace output.

[0057] The set wind pressure may be the original wind pressure of the blast furnace, which may be the wind pressure of the blast furnace before the working iron mouth is found unable to open normally, and the wind pressure may be 5 kPa. The set wind pressure may also be appropriately smaller or larger than the original wind pressure.

[0058] S160, controlling the air volume in the blast furnace to reduce the set air volume value per minute.

[0059] Specifically, when the required time is less than the fault handling time, it means that the amount of slag iron in the blast furnace has reached the maximum slag iron capacity M of the furnace, and the fault of the working iron mouth has not been eliminated, and the working iron mouth still cannot be opened. In this case, it is necessary to reduce the air volume of the blast furnace, that is, control the blast furnace to reduce the set air volume value per minute based on the original air volume, so as to reduce the amount of slag iron produced by the blast furnace.

[0060] For example, the specific method of reducing wind operation can be: first determine the wind consumption required for the current blast furnace to produce 1 ton of slag iron, generally 1000m 3 ~2000m 3 The wind consumption of a blast furnace to produce 1 ton of iron is 1000m 3 ~1050m 3 , which means that it takes 1000m3 to produce 1 ton of slag iron. 3 ~1050m 3 The wind (different blast furnaces with different capacities have different smelting raw materials, so there are slight differences). Then determine the cumulative air reduction M3 = (t1-t3) * S1 * 1050, until the working iron mouth can be opened normally. The air reduction control amount required for the blast furnace is: M3 / t1m 3 / min. The set air volume value can be greater than or equal to M3 / t1.

[0061] The present embodiment provides a method for regulating the slag iron capacity of a blast furnace hearth, the method comprising: when the working iron mouth cannot be opened normally, determining the slag iron production parameters within a set time period, then determining the required time for the slag iron in the blast furnace to increase to the maximum slag iron capacity of the hearth according to the slag iron production parameters and the maximum slag iron capacity of the hearth, and determining the fault handling time for solving the working iron mouth fault. Then determine whether the required time is greater than or equal to the fault handling time, and when the required time is greater than or equal to the fault handling time, control the furnace inlet wind pressure of the blast furnace not to exceed the set wind pressure, and the set wind pressure can be the original furnace inlet wind pressure, so as to ensure that when the working iron mouth cannot be opened normally, the iron production of the blast furnace is still not reduced. When the required time is less than the fault handling time, control the air volume in the blast furnace to reduce the set air volume value per minute, so as to appropriately reduce the air volume in the blast furnace before the working iron mouth can be opened, thereby reducing the amount of slag iron produced by the blast furnace, which can avoid the oxygen stop operation of the blast furnace, and can also avoid the slag iron amount in the blast furnace reaching the maximum slag iron capacity of the hearth before the working iron mouth is opened. Compared with the prior art which simply stops oxygen operation when the working iron mouth cannot be opened, the method for controlling the slag and iron capacity of the blast furnace hearth provided in this embodiment can take corresponding measures according to the specific circumstances, while ensuring the safety of the blast furnace hearth, minimizing the blast furnace production loss and cost loss when the working iron mouth abnormally cannot discharge slag and iron.

[0062] Optionally, the slag production parameters include a slag production speed S1 of the blast furnace within a set time period and a slag amount M1 of the blast furnace at a current moment.

[0063] The time required for the slag in the blast furnace to increase to the maximum slag capacity of the furnace is determined according to the slag production parameters and the maximum slag capacity of the furnace, including: determining the increase in blast furnace slag according to the difference between the maximum slag capacity of the furnace and the current amount of blast furnace slag; and determining the time required according to the increase in blast furnace slag and the slag production speed.

[0064] Specifically, the slag production speed S1 can be the ratio of the blast furnace slag amount M1 at the current moment to the set time period t2, that is, S1 = M1 / t2. The blast furnace slag increase M2 = M-M1, and the required time t3 can be the ratio of the blast furnace slag increase M2 to the slag production speed S1, that is, t3 = M2 / S1. That is, under the condition that the blast furnace production state remains unchanged, the time required for the slag amount in the blast furnace to reach the maximum slag capacity of the furnace from the current moment.

[0065] Optionally, the set wind pressure includes the blast furnace inlet wind pressure before the working taphole cannot be opened normally.

[0066] Specifically, when the inlet air pressure of the blast furnace is the inlet air pressure of the blast furnace before the working iron mouth cannot be opened normally, that is, when the inlet air pressure of the blast furnace remains unchanged, the amount of slag and iron in the blast furnace after the required time will not exceed the maximum slag and iron capacity of the furnace, thereby ensuring the safety of the blast furnace. Therefore, in this embodiment, when the required time is greater than or equal to the fault handling time, the inlet air pressure of the blast furnace is controlled to be the inlet air pressure of the blast furnace before the working iron mouth cannot be opened normally, which can ensure that the iron production of the blast furnace remains basically unchanged, and can also ensure that the amount of slag and iron in the blast furnace does not exceed the maximum slag and iron capacity of the furnace before the fault of the working iron mouth is resolved, thereby ensuring the safety of the blast furnace.

[0067] Optionally, controlling the air volume in the blast furnace to reduce the set air volume value per minute includes: determining the blast furnace air consumption; determining the set air volume value based on slag iron production parameters, blast furnace air consumption, required time and fault handling time.

[0068] Specifically, the blast furnace air consumption refers to the air volume consumed in the blast furnace production process per unit time. Before executing step S160, the set air volume value is first determined.

[0069] Determining the set air volume value specifically includes: first determining the blast furnace air consumption; then determining the set air volume value according to the slag iron production parameters, the blast furnace air consumption, the required time and the fault handling time. The cumulative air volume reduction required for the blast furnace can be determined according to the product of the slag iron production speed S1 in the slag iron production parameters and the blast furnace air consumption and the difference between the fault handling time and the required time, that is, the cumulative air volume reduction M3 = (t1-t3)*S1*h1, where h1 is the blast furnace air consumption. And the set air volume value is determined according to the ratio of the cumulative air volume reduction M3 to the fault handling time t1, that is, the set air volume value required to reduce the air volume in the blast furnace per minute before the working iron mouth fault is resolved, so that it can be set to ensure that the slag iron amount in the blast furnace does not exceed the maximum slag iron capacity M of the furnace before the working iron mouth is opened normally.

[0070] Optionally, the time required for the slag in the blast furnace to increase to the maximum slag capacity of the furnace is determined based on slag production parameters and the maximum slag capacity of the furnace, including: establishing a slag storage calculation model for the furnace when the blast furnace is unable to discharge slag; and determining the maximum slag capacity of the furnace based on the slag storage calculation model.

[0071] Specifically, the maximum slag iron capacity of the furnace refers to the maximum amount of slag iron that the furnace can store. By determining the maximum slag iron capacity of the furnace, corresponding measures can be taken to control the amount of slag produced by the blast furnace before the slag iron in the furnace reaches the maximum slag iron capacity of the furnace, so as to avoid irreparable losses caused by the slag in the blast furnace exceeding the maximum slag iron capacity of the furnace.

[0072] Optionally, a calculation model for storing slag in the hearth when the blast furnace is unable to discharge slag is established, including: determining the calculation model for storing slag in the hearth according to the effective volume of the hearth, the safety factor of the blast furnace, the volume coefficient of the hearth, the density of molten iron and the density of slag.

[0073] Optionally, the calculation model for the furnace storage slag iron is determined by the following formula:

[0074] M=((V*φ1)+(V*φ2))*γ*Ψ; wherein, M represents the maximum slag and iron capacity of the furnace, V represents the effective volume of the furnace, φ1 represents the density of molten iron, φ2 represents the density of slag and iron, γ represents the safety factor of the blast furnace, and Ψ represents the volume coefficient of the furnace.

[0075] Specifically, the volume of the furnace below the lower edge of the tuyere of the blast furnace (the high-temperature slag iron contacts the tuyere and can quickly burn through the tuyere because the tuyere is made of metal and has no refractory material) is taken as the effective volume V of the furnace. Exemplarily, the maximum amount of slag iron that can be stored in the furnace is M = ((V*7)+(V*0.35))*0.75*0.35. Where: 0.35 represents the slag density φ2, in tons / m 3 ; 7 represents the density of molten iron φ1, in tons / m 3; 0.75 represents the safety factor γ that the blast furnace can accept. The safety factor can be any value between 0 and 1. The smaller the value, the smaller the ability of the blast furnace hearth to accept safety risks. The safety factor of the blast furnace can be between 0.7 and 0.8, which means that when the slag iron content in the blast furnace hearth reaches 80%, the blast furnace can implement wind-down safety operations. 0.35 represents the hearth volume coefficient Ψ, which means that most of the volume of the blast furnace hearth is occupied by coke, debris, etc. The hearth volume coefficient Ψ can be converted by the volume occupied by coke accumulated in the hearth after the blast furnace is shut down. It is a practical value after multiple blast furnace shutdowns, which means that during the blast furnace production period, the coke inside the hearth accounts for about 65% of the volume.

[0076] Optionally, when the required time is greater than or equal to the fault handling time, a spare iron mouth is mined.

[0077] Specifically, when the required time is greater than or equal to the fault handling time, the depth of the working iron mouth of the previous furnace is used as the reference value of the iron mouth of this furnace, and the refractory clay sealed on the outside of the iron mouth is drilled with a pneumatic drill to a depth of about 1 meter (about 20 minutes). Then, the medium-pressure oxygen is connected with a metal oxygen pipe and placed in the small hole drilled by the pneumatic drill. The oxygen is not turned on and the fire is not ignited, so as to complete the mining of the spare iron mouth. At this time, the heat of the blast furnace cannot be removed, which will cause the blast furnace wind pressure to increase. As the blast furnace wind pressure increases, the blast furnace operation adopts the operation method of reducing the wind temperature, reducing the amount of coal injection, and reducing the amount of oxygen enrichment to balance the heat of the furnace and keep the blast furnace inlet wind pressure not exceeding the original wind pressure of 5kpa.

[0078] Optionally, when the fault handling time cannot be determined, stop inputting enriched oxygen into the blast furnace, reduce the air volume in the blast furnace to the minimum value, and prepare for the blast furnace to stop blowing.

[0079] Specifically, the fault handling time t1 may be uncertain. For example, when a power outage occurs in a factory, the working tap cannot be opened normally. At this time, it is unknown when the factory will have power again. Therefore, the fault handling time t1 cannot be determined.

[0080] When the fault handling time t1 cannot be determined, the working iron mouth cannot be opened for a long time. When it is uncertain when the working iron mouth can be handled, the blast furnace operation immediately stops oxygen enrichment, immediately reduces the air flow to the lowest state, and implements the operation of adding resting air materials. After the resting air materials are added, the blast furnace is directly shut down, thereby reducing the probability of dangerous accidents in the furnace.

[0081] In order to better understand the method for controlling the amount of slag and iron in the blast furnace provided by the embodiment of the present invention, a specific embodiment will be introduced below to help understand:

[0082] Blast furnace effective volume 1050m 3, under normal production conditions, slag is discharged from two iron mouths of the blast furnace. In October 2023, the main ditch of one iron mouth of the blast furnace was under repair, and iron was discharged from one iron mouth of the blast furnace. In a certain batch, the single iron mouth in front of the blast furnace could not discharge slag normally, and the main machine of the opening machine in front of the furnace was broken. It took about 120 minutes to replace the main machine of the opening machine. The blast furnace was blocked 28 minutes after the last batch, and the air volume of the blast furnace was 2300m 3 / min (air volume includes oxygen enrichment), the volume below the tuyere of the blast furnace is 108m 3 , the maximum amount of slag iron that the blast furnace hearth can store is M=(108*7+108*3.5)*0.75*0.35=298 tons; after blocking the mouth for 28 minutes, the hearth generates 80.6 tons of slag iron, and the amount of slag iron generated per minute is S1=80.6 / 28=2.88 tons; the time t3 required for the blast furnace hearth to generate slag iron reaching M is t3=(289-80.6) / 2.88=72.36 minutes, 72.36 minutes is the required time, and the 120 minutes required to replace the main machine of the opening machine is the fault handling time. The fault handling time is longer than the required time, indicating that the amount of slag iron stored in the hearth is at a controllable level before the iron mouth is opened normally. At this time, in this state, the depth of the iron mouth of the previous furnace is estimated to be L = 2300mm, and the refractory clay that blocks the outside of the iron mouth is drilled with a pneumatic drill. The drilling depth is about 1.6 meters, which takes 36 minutes. Then the medium-pressure oxygen is connected with a metal oxygen pipe and placed in the small hole drilled by the pneumatic drill. The oxygen is not turned on and the fire is not ignited. Because the heat of the blast furnace cannot be removed, the blast furnace wind pressure increases. The wind pressure increases by 3kpa, and the blast furnace wind temperature decreases by 10℃. At the same time, the coal injection volume is reduced by 0.5t / h and the oxygen enrichment volume is reduced by 1000m 3 / h, used to balance the heat of the furnace and keep the air pressure entering the blast furnace stable within 320kPa.

[0083] Figure 2 Schematic diagram of a control device for controlling the amount of slag and iron in a blast furnace provided by an embodiment of the present invention, with reference to Figure 2The control device provided in this embodiment includes: a slag parameter determination module 210, a duration determination module 220, a comparison module 230 and a control module 240; the slag parameter determination module 210 is used to determine the slag production parameters within a set time period when the working iron mouth cannot be opened normally, wherein the set time period is the time period from the moment when the working iron mouth was closed last time to the current moment; the duration determination module 220 is used to determine the time required for the slag in the blast furnace to increase to the maximum slag capacity of the furnace according to the slag production parameters and the maximum slag capacity of the furnace, and to determine the fault handling time for solving the working iron mouth fault; the comparison module 230 is used to determine whether the required time is greater than or equal to the fault handling time; the control module 240 is used to control the blast furnace inlet air pressure not to exceed the set air pressure when the required time is greater than or equal to the fault handling time, and to control the air volume in the blast furnace to reduce the set air volume value per minute when the required time is less than the fault handling time.

[0084] The device for controlling the slag and iron capacity of a blast furnace hearth provided in this embodiment has corresponding beneficial effects as does the method for controlling the slag and iron capacity of a blast furnace hearth provided in any embodiment of the present invention. For technical details not detailed in this embodiment, please refer to the method for controlling the slag and iron capacity of a blast furnace hearth provided in any embodiment of the present invention.

[0085] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0086] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for regulating the amount of slag and iron in a blast furnace hearth, characterized in that: include: When the working iron mouth cannot be opened normally, determining the slag iron production parameters within a set time period, wherein the set time period is a time period from the moment when the working iron mouth was closed last time to the current moment; Determine the time required for the slag in the blast furnace to increase to the maximum slag capacity of the furnace according to the slag production parameters and the maximum slag capacity of the furnace; Determine the troubleshooting time for resolving the working iron mouth trouble; Determine whether the required time is greater than or equal to the fault handling time; If yes, then controlling the inlet air pressure of the blast furnace not to exceed the set air pressure; If not, the air volume in the blast furnace is controlled to decrease by a set air volume value per minute.

2. The control method according to claim 1, characterized in that: The slag iron production parameters include the slag iron production speed of the blast furnace within the set time period and the slag iron amount of the blast furnace at the current moment; The step of determining the time required for the slag in the blast furnace to increase to the maximum slag capacity of the furnace according to the slag production parameters and the maximum slag capacity of the furnace comprises: Determine the blast furnace slag iron increase amount according to the difference between the maximum slag iron capacity of the furnace and the blast furnace slag iron amount at the current moment; The required time is determined according to the increase in the blast furnace slag and the slag production speed.

3. The control method according to claim 1, characterized in that: The set air pressure includes the air pressure entering the blast furnace before the working taphole cannot be opened normally.

4. The control method according to claim 1, characterized in that: The controlling of the air volume in the blast furnace to reduce the set air volume value per minute comprises: Determine the unit air consumption of blast furnace; The set air volume value is determined according to the slag iron production parameters, the blast furnace air consumption, the required time and the fault handling time.

5. The control method according to claim 1, characterized in that: The method of determining the time required for the slag in the blast furnace to increase to the maximum slag capacity of the furnace according to the slag production parameters and the maximum slag capacity of the furnace includes: Establish a calculation model for slag storage in the furnace when the blast furnace cannot discharge slag; The maximum slag and iron capacity of the furnace is determined according to the calculation model for storing slag and iron in the furnace.

6. The control method according to claim 5, characterized in that: The establishment of a calculation model for storing slag in a furnace when the blast furnace is unable to discharge slag includes: The calculation model for storing slag in the hearth is determined according to the effective volume of the hearth, the safety factor of the blast furnace, the volume coefficient of the hearth, the density of molten iron and the density of slag.

7. The control method according to claim 6, characterized in that: The calculation model for furnace slag storage is determined by the following formula: M=((V*φ1)+(V*φ2))*γ*Ψ; Wherein, M represents the maximum slag and iron capacity of the furnace, V represents the effective volume of the furnace, φ1 represents the density of molten iron, φ2 represents the density of slag and iron, γ represents the safety factor of the blast furnace, and Ψ represents the volume coefficient of the furnace.

8. The control method according to claim 1, characterized in that: When the required time is greater than or equal to the fault handling time, the spare iron mouth is mined.

9. The control method according to claim 1, characterized in that: When the fault handling duration cannot be determined, the input of enriched oxygen into the blast furnace is stopped, the air volume in the blast furnace is reduced to a minimum value, and preparations for shutting down the blast furnace are made.

10. A device for controlling the amount of slag and iron in a blast furnace, characterized in that: include: Slag iron parameter determination module, duration determination module, comparison module and control module; The slag iron parameter determination module is used to determine the slag iron production parameters within a set time period when the working iron mouth cannot be opened normally, wherein the set time period is the time period from the moment when the working iron mouth was closed last time to the current moment; The duration determination module is used to determine the time required for the slag in the blast furnace to increase to the maximum slag capacity of the furnace according to the slag production parameters and the maximum slag capacity of the furnace, and to determine the fault handling time for solving the working iron mouth fault; The comparison module is used to determine whether the required time is greater than or equal to the fault processing time; The control module is used to control the inlet air pressure of the blast furnace not to exceed the set air pressure when the required time is greater than or equal to the fault handling time, and to control the air volume in the blast furnace to reduce the set air volume value per minute when the required time is less than the fault handling time.

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