Method for predicting first tapping time during blow-in of blast furnace

Abstract

The invention provides a method for predicting blowing-in first tapping time of a blast furnace. The method comprises the following steps: acquiring iron content of a damping-down material; calculating the iron amount of a dead iron layer and the first appropriate iron storage amount of iron furnace steel; calculating the iron content of a normal material after air supply according to the iron content of a damping-down material, the iron content of a dead iron layer and the appropriate iron storage amount of iron furnace steel for the first time; the first tapping time is obtained according to the iron content of the normal material after air supply and the blanking speed, and the first furnace iron tapping time is predicted from the tapping essence by directly calculating the relationship between the total iron content and the iron content of the iron material, so that slag iron and heat are gathered in a hearth as much as possible, and the slag iron is smoothly separated and has good fluidity during the first tapping in blowing in; and the blast furnace can quickly and smoothly recover the furnace condition, and unnecessary fluctuation is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of blast furnace opening, and in particular to a method for predicting the first iron tapping time of a blast furnace opening. Background Art

[0002] 10 to 25 hours after the blast furnace is started is the period when the room temperature charge in the furnace heats up and begins to be reduced (the soft melting zone formation period), and the generated slag and iron melt is discharged for the first time. The successful discharge of the first furnace of slag and iron is crucial to the smooth recovery of the blast furnace. It is necessary to correctly grasp the level of generated slag and iron, and choose a reasonable time for the discharge of initial slag and initial iron. At the same time, sufficient preparations for iron tapping need to be made in front of the furnace, because the first slag and iron are often at a low temperature and the slag and iron separation is not good, so a temporary sand mouth needs to be prepared, and the slag and iron flow into the iron tank uniformly through the emergency swing nozzle.

[0003] From the perspective of heat reserve, the main difference between a blast furnace before opening and a blast furnace during normal production lies in the heat reserve of the hearth, including the heat reserve of the overall refractory materials and the materials in the hearth. The role of sleepers, clean coke, and light-load materials in the blast furnace opening charge is to provide the heat required for the loading of materials into the furnace, reduction reaction, slag iron melt, and the heating of the hearth refractory materials. The entire heating process is the process of the blast furnace resuming normal production. With the heat reserve of the hearth, the molten zone in the furnace is continuously raised to a normal level. In the early stage of furnace opening, the wind temperature is generally around 800°C, and the heat brought in by the blast is relatively small. The hearth is in a cooling state from the beginning, and gradually heats up. The heat of the slag iron formed in the early stage is seriously insufficient. When the first iron is produced, the physical heat of the slag iron is often low, resulting in poor fluidity of the slag iron and poor separation.

[0004] From the perspective of blast furnace opening in the industry, insufficient physical heat is a common problem and a limiting condition that is difficult to change. In the past, blast furnaces were accustomed to using the method of dealing with furnace cooling to deal with the iron discharge of new blast furnaces, frequently opening the iron mouth, and discharging the cold slag iron in the furnace as much as possible and as early as possible. However, such an operation will result in a small amount of slag iron, insufficient heat accumulation, and uneven slag phase for the first time, which will lead to poor fluidity of slag iron and difficulty in separation, and such operation is very unfavorable for the heat reserve of the furnace. The reason for dealing with furnace cooling is to discharge the cold slag iron into the furnace as much as possible because it is necessary to discharge the cold slag iron into the furnace before the still fluid cold slag iron is discharged to prevent the furnace condition from further deteriorating, so that this part of the slag iron forms a solidified crust and hinders the communication between the upper and lower parts of the furnace. Its prerequisite is that the heat of the furnace is basically in the production state, and there is already a considerable amount of iron stored in the furnace, and the slag iron is in a cold state; when the furnace is opened, these two conditions are not met, and the slag iron is in a hot state, and the heat of the slag iron needs to be gathered to further heat the furnace.

[0005] How to increase the heat reserve of the hearth before the first iron tapping is the key to solving this problem; if the first iron tapping is advanced, the storage of slag iron is insufficient, resulting in insufficient heat storage in the hearth, and the temperature of the first molten iron may be lower than 1350℃. If the first iron tapping is appropriately delayed, as the amount of slag iron increases, the heat of the hearth increases accordingly, and the molten iron temperature is generally between 1380 and 1450℃, which is also a limiting factor for the free flow of slag iron when the furnace is opened. However, if the iron tapping time is too late, the slag iron level in the furnace will rise and even exceed the safe iron storage capacity of the hearth, causing the pressure difference in the furnace to increase, and even burning through the tuyere, which will bring huge passiveness to the recovery operation; therefore, it is of great significance to scientifically and reasonably determine the time of the first iron tapping.

[0006] In the prior art, a patent document with application number CN202310718547.4 discloses a method for predicting the timing of the first iron tapping when a blast furnace is opened, comprising the following steps: S1, calculating the volume of coke in the furnace core; S2, calculating the amount of coke in the furnace core; S3, calculating the amount of coke replacement after ignition; S4, deducing the amount of slag and iron generated and the number of loading batches after ignition; S5, predicting the slag seen at air injection and the corresponding cumulative air volume and cumulative number of loading batches at the first opening node; S6, correcting the predicted opening and iron tapping timing according to the actual time of slag blocking at air injection.

[0007] The patent document with application number CN202010366038.6 discloses a method for calculating the first iron-tapping time and a blast furnace opening method, including the following steps: batching, blast furnace distribution rules and basic matrix determination, furnace opening batching calculation and charging determination, first iron-tapping time determination, smelting process control after furnace opening, upper and lower operation systems during the smelting process and comprehensive smelting parameter control, and normal intensified smelting.

[0008] Patent document with application number CN201510050416.9 discloses a method for determining the cumulative air volume of the first batch of iron produced by a large blast furnace. The air volume during iron production reaches 5000-5200m 3 / min, the air supply ratio is 1.0, the iron tapping time is controlled at 20-22h after air supply, and the cumulative air volume is 4.9 million to 5.1 million m 3 The first furnace of iron is tapped at this time. The amount of molten iron produced reaches 400-500t, the amount of slag is 200-300t, and the temperature of the molten iron reaches above 1450℃ after the slag is seen.

[0009] The patent document with application number CN202111478172.6 discloses a method for controlling the first iron tapping of a large blast furnace. By controlling the time when the iron mouth is opened for the first time, the first iron tapping of molten iron and then primary slag is achieved after the furnace is opened.

[0010] However, the calculation process of the prior art methods is relatively complicated. Therefore, the present invention provides a method for predicting the first iron tapping time of a blast furnace. Summary of the invention

[0011] According to the above-mentioned deficiencies, a method for predicting the first iron tapping time of a blast furnace is provided. The present invention mainly obtains the iron content of the blast furnace; calculates the iron content of the dead iron layer and the suitable iron storage amount of the first iron furnace steel; calculates the iron content of the normal material after air supply according to the iron content of the blast furnace, the iron content of the dead iron layer and the suitable iron storage amount of the first iron furnace steel; obtains the first iron tapping time according to the iron content of the normal material after air supply and the material discharge speed, directly calculates the relationship between the total iron content and the iron content of the iron material, and predicts the first iron tapping time from the essence of iron tapping, so that the furnace gathers as much slag and heat as possible, ensuring that the slag and iron are separated smoothly and have good fluidity when the furnace is opened for the first time, which is conducive to the rapid and smooth recovery of the furnace condition of the blast furnace and reduces unnecessary fluctuations.

[0012] The technical means adopted by the present invention are as follows:

[0013] The present invention provides a method for predicting the first iron tapping time of a blast furnace, comprising:

[0014] Obtain the iron content of the resting material;

[0015] Calculate the amount of iron in the dead iron layer and the appropriate amount of iron stored in the first iron furnace;

[0016] Calculate the iron content of the normal material after air supply according to the iron content of the resting material, the iron content of the dead iron layer and the suitable iron storage amount of the first iron furnace steel;

[0017] The first iron tapping time is obtained according to the normal iron content of the material after air supply and the material feeding speed.

[0018] Preferably, the amount of iron in the dead iron layer is calculated in the following manner:

[0019] M 层 =V 层 ×ρ 铁 ×ζ 层

[0020] Among them, M 层 is the amount of iron in the dead iron layer, in t, V 层 is the volume of the dead iron layer in the blast furnace, in m 3 , ρ 铁 is the density of molten iron, in kg / m3, ζ 层 is the iron capacity coefficient of the dead iron layer.

[0021] Preferably, the suitable iron storage amount of the first iron furnace steel is calculated as follows:

[0022] M 适 =1 / 4×π×D 2 ×h 高度差 ×ρ 铁 ×K×δ

[0023] Among them, M 适 is the suitable iron storage capacity of the first iron furnace steel, in t, D is the furnace diameter, in m, h 高度差 is the height difference between the center line of the tuyere and the center line of the tap hole, in m, ρ 铁 is the density of molten iron, the unit is Kg / m3, K is the furnace iron capacity coefficient, and δ is the suitability coefficient.

[0024] Preferably, the iron content of the normal material after air supply is calculated according to the iron content of the resting material, the iron content of the dead iron layer and the suitable iron storage amount of the first iron furnace steel, and is calculated in the following manner:

[0025] M 正 =M 层 +M 适 -M 休

[0026] Among them, M 正 is the normal iron content of the material after air supply, in t, M 层 is the amount of iron in the dead iron layer, in t, M 适 The first iron furnace steel suitable iron storage capacity, unit is t, M 休 It is the iron content of the resting material, in t.

[0027] Preferably, obtaining the first iron tapping time according to the normal material iron content after air supply and the material feeding speed comprises:

[0028] Providing multiple batches of normal materials according to the iron content of the normal materials after air supply, wherein the sum of the iron content of the multiple batches of normal materials is equal to the iron content of the normal materials after air supply;

[0029] Feeding multiple batches of the normal materials at the feeding speed, calculating the time for adding the multiple batches of the normal materials into the furnace and the smelting period for the multiple batches of the normal materials to be fed into the furnace;

[0030] The first iron tapping time is obtained by adding the time for adding multiple batches of the normal materials into the furnace and the smelting period for the multiple batches of the normal materials to be put into the furnace.

[0031] Preferably, the time for adding multiple batches of the normal material into the furnace is calculated as follows:

[0032]

[0033] Wherein, T1 is the time for adding multiple batches of normal materials into the furnace, in hours, Q i批铁 is the normal material of the i-th batch, N i is the feeding speed, in batches / hour, M 正 It is the normal iron content of the material after air supply, in t.

[0034] Preferably, the smelting period of multiple batches of normal materials to the furnace is calculated in the following manner:

[0035]

[0036] Wherein, μ is the material speed correction coefficient, T2 is the smelting cycle of multiple batches of normal materials to furnace steel, in hours, N i is the feeding speed, in batches / hour, V u is the effective working volume of the blast furnace, in m 3 , V 线 The throat volume above the material line, in m 3 , V 风 The effective volume of the blast furnace below the tuyere, in m 3 , V o The volume of ore in each batch of materials, in m 3 , V c is the volume of coke in each batch of material, in m 3 , γ is the compression coefficient of the charge in the furnace.

[0037] Compared with the prior art, the present invention has the following advantages:

[0038] 1. The present invention provides a method for predicting the first iron tapping time when a blast furnace is opened, by obtaining the iron content of the blast-off material; calculating the iron content of the dead iron layer and the suitable iron storage amount of the first iron furnace steel; calculating the iron content of the normal material after air supply according to the iron content of the blast-off material, the iron content of the dead iron layer and the suitable iron storage amount of the first iron furnace steel; obtaining the first iron tapping time according to the iron content of the normal material after air supply and the material unloading speed, without considering the filling volume replacement of various materials, directly predicting the first iron tapping time from the essence of iron tapping by calculating the relationship between the total iron content and the iron content of the iron material, so that the furnace cylinder gathers as much slag and heat as possible, ensuring that the slag and iron are separated smoothly and the fluidity is good when the furnace is opened for the first iron tapping, which is conducive to the blast furnace to quickly and smoothly restore the furnace condition and reduce unnecessary fluctuations.

[0039] 2. The method provided by the present invention for predicting the first iron tapping time of a blast furnace is suitable for accurate opening of blast furnaces of different volumes. The calculation method is simple, the process is templated, the controllability is strong, and it is fast and accurate.

[0040] 3. The present invention provides a method for predicting the first iron-tapping time of a blast furnace. By predicting the first iron-tapping time of a blast furnace, it ensures that the physical heat of the slag and iron is sufficient, the fluidity is good, and the separation effect is good when the blast furnace is opened for the first time, so that the blast furnace can be smoothly restored to its condition, the recovery process can be accelerated, and the furnace can be opened and put into production ahead of schedule. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0042] Figure 1 A schematic flow chart of a method for predicting the first iron tapping time of a blast furnace provided by the present invention. DETAILED DESCRIPTION

[0043] 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.

[0044] 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.

[0045] Reference Figure 1 , Figure 1 A flow chart of a method for predicting the first iron-tapping time of a blast furnace provided by the present invention is provided to illustrate a specific embodiment of a method for predicting the first iron-tapping time of a blast furnace provided by the present invention, comprising:

[0046] Obtain the iron content of the resting material;

[0047] Calculate the amount of iron in the dead iron layer and the appropriate amount of iron stored in the first iron furnace;

[0048] Calculate the iron content of normal material after air supply based on the iron content of the resting material, the iron content of the dead iron layer and the suitable iron storage amount of the first iron furnace steel;

[0049] The first iron tapping time is obtained based on the normal iron content of the material after air supply and the material feeding speed.

[0050] It should be noted that the iron content of the off-air material is the preset total amount of iron stored in the furnace cylinder. The time for the first iron mouth opening when the furnace is opened is calculated by matching the preset total amount of iron stored in the furnace cylinder during iron tapping with the total amount of iron brought into the furnace charge and based on the material speed. The total amount of iron brought into the furnace charge is the iron content of the normal material after air supply, and the time for the first iron mouth opening when the furnace is opened is the first iron tapping time. The amount of molten iron in the furnace during the first iron tapping is generated by the iron content of the off-air material and the iron content of the normal material after air supply. The first iron tapping time is determined by the amount of iron stored in the furnace exceeding the iron content of the center line of the iron mouth to reach the appropriate iron storage amount for the first iron furnace steel. The iron storage amount in the furnace is composed of the amount of iron in the dead iron layer and the appropriate iron storage amount in the furnace cylinder for the first iron tapping.

[0051] It can be understood that the method provided in this embodiment uses the actual situation of slag blocking the iron mouth by empty spraying, compares the corresponding cumulative air volume and the cumulative number of batches of loading with the predicted value, judges the error of air volume and charge, and then corrects the prediction of the first iron tapping time, accurately judges the appropriate iron tapping time, and ensures the smooth progress of the furnace opening process. And the method provided in this embodiment realizes the iron tapping when the iron mouth is opened by establishing control over the first iron mouth opening time, forming the first iron tapping in which molten iron is discharged first and then the initial slag is discharged after the furnace is opened; then the iron mouth and the channels and accessories for conveying slag iron are respectively controlled or set, which serves for uniform iron tapping on the one hand, and provides a physical separation mechanism for the smooth separation of slag iron on the other hand; through the above comprehensive settings, the iron mouth is opened to see molten iron as a whole, without the need to pre-discharge initial slag, while ensuring uniform iron tapping and easy separation of slag iron, greatly reducing the consumption of a large amount of manpower and material resources during the furnace opening process.

[0052] Compared with the prior art, the present embodiment provides a method for predicting the first iron tapping time when a blast furnace is opened, by obtaining the iron content of the blast-off material; calculating the iron content of the dead iron layer and the suitable iron storage amount of the first iron furnace steel; calculating the iron content of the normal material after air supply according to the iron content of the blast-off material, the iron content of the dead iron layer and the suitable iron storage amount of the first iron furnace steel; obtaining the first iron tapping time according to the iron content of the normal material after air supply and the material unloading speed, without considering the filling volume replacement of various materials, directly predicting the first iron tapping time from the essence of iron tapping by calculating the relationship between the total iron content and the iron content of the iron material, so that the furnace cylinder gathers as much slag and heat as possible, ensuring smooth separation of slag and iron when the furnace is opened for the first time, with good fluidity, which is conducive to the rapid and smooth restoration of the furnace condition of the blast furnace, and reduces unnecessary fluctuations. It is suitable for the precise opening of blast furnaces of different volumes, and the calculation method is simple, the process is templated, and the controllability is strong and it is fast and accurate. In addition, the method provided in this embodiment predicts the time for tapping the first batch of iron when the blast furnace is opened, thereby ensuring that the physical heat of the iron slag is sufficient, the fluidity is good, and the separation effect is good when the blast furnace is opened for the first time, thereby achieving smooth recovery of the blast furnace condition, accelerating the recovery process, and starting the furnace and reaching production ahead of schedule.

[0053] In some optional embodiments, the amount of iron in the dead iron layer is calculated as follows:

[0054] M 层 =V 层 ×ρ 铁 ×ζ 层

[0055] Among them, M 层 is the amount of iron in the dead iron layer, in t, V 层 is the volume of the dead iron layer in the blast furnace, in m 3 , ρ 铁 is the density of molten iron, in kg / m3, ζ 层 is the iron capacity coefficient of the dead iron layer.

[0056] In some optional embodiments, the suitable iron storage amount of the first iron furnace steel is calculated as follows:

[0057] M 适 =1 / 4×π×D 2 ×h 高度差 ×ρ 铁 ×K×δ

[0058] Among them, M 适 is the suitable iron storage capacity of the first iron furnace steel, in t, D is the furnace diameter, in m, h 高度差 is the height difference between the center line of the tuyere and the center line of the tap hole, in m, ρ 铁 is the density of molten iron, the unit is Kg / m3, K is the furnace iron capacity coefficient, and δ is the suitability coefficient.

[0059] It can be understood that the value range of the furnace hearth iron coefficient K is 60%-70%, and the suitable coefficient δ is a suitable coefficient, and its value range is 20%-40%.

[0060] In some optional embodiments, the iron content of the normal material after air supply is calculated according to the iron content of the resting material, the iron content of the dead iron layer and the suitable iron storage amount of the first iron furnace steel, and is calculated in the following manner:

[0061] M 正 =M 层 +M 适 -M 休

[0062] Among them, M 正 is the normal iron content of the material after air supply, in t, M 层 is the amount of iron in the dead iron layer, in t, M 适 The first iron furnace steel suitable iron storage capacity, unit is t, M 休 It is the iron content of the resting material, in t.

[0063] It can be understood that the normal iron content of the material after air supply is the normal iron content of the material required to be supplemented when the furnace hearth accumulates to the amount of molten iron in the furnace when the first iron is tapped.

[0064] In some optional embodiments, the first iron tapping time is obtained according to the normal iron content of the material after air supply and the material feeding speed, including:

[0065] Provide multiple batches of normal materials according to the iron content of the normal materials after air supply, and the sum of the iron content of the multiple batches of normal materials is equal to the iron content of the normal materials after air supply;

[0066] Multiple batches of normal materials are fed into the furnace according to the feeding speed, and the time for multiple batches of normal materials to be added into the furnace and the smelting cycle of multiple batches of normal materials fed into the furnace are calculated;

[0067] The time for adding multiple batches of normal materials into the furnace and the smelting cycle of multiple batches of normal materials into the furnace are added together to obtain the first iron tapping time.

[0068] It can be understood that the time it takes for multiple batches of normal materials to be added into the furnace is the time it takes for the last batch of normal materials to be added into the furnace to replenish the amount of molten iron in the furnace from the time the furnace is opened for air supply to the time the first iron is tapped.

[0069] In some optional embodiments, the time for adding multiple batches of normal materials into the furnace is calculated as follows:

[0070]

[0071] Wherein, T1 is the time for adding multiple batches of normal materials into the furnace, in hours, Q i批铁 is the normal material of the i-th batch, N i is the feeding speed, in batches / hour, M 正 It is the normal iron content of the material after air supply, in t.

[0072] In some optional embodiments, the smelting period of multiple batches of normal materials into the furnace is calculated as follows:

[0073]

[0074] Wherein, μ is the material speed correction coefficient, T2 is the smelting cycle of multiple batches of normal materials to furnace steel, in hours, N i is the feeding speed, in batches / hour, V u is the effective working volume of the blast furnace, in m 3 , V 线 The throat volume above the material line, in m 3 , V 风 The effective volume of the blast furnace below the tuyere, in m 3 , V o The volume of ore in each batch of materials, in m3 , V c is the volume of coke in each batch of material, in m 3 , γ is the compression coefficient of the charge in the furnace.

[0075] It is understandable that if the blast furnace is a large or medium-sized blast furnace, the compression coefficient γ of the charge in the furnace ranges from 10% to 15%; if the blast furnace is a small blast furnace, the compression coefficient γ of the charge in the furnace ranges from 8% to 10%. Since both air addition and material change will cause the hourly material discharge speed to change during normal recovery, but considering that the hourly material discharge speed increases after air addition and the hourly material speed slows down after material change and batch weight increase, it offsets to a certain extent, and under normal circumstances, μ is 1.

[0076] In some optional embodiments, 4000m is calculated 3 The time of first iron tapping after the blast furnace overhaul, the volume of dead iron layer is known to be 308.5m 3 , the dead iron layer iron coefficient is 0.5, the furnace throat diameter is 9.6m, the height is 2m, the material line zero position is the upper edge of the furnace throat steel brick, the distance from the center line of the tuyere to the center line of the iron mouth is 4.75m, the furnace cylinder diameter is 13.3m, the wind-off material contains 490t of iron, after the air supply time T1, the normal loading ore batch weight is 60t, the coke batch weight is 21.72t, the ore density is 1.95Kg / m3, the coke density is 0.55Kg / m3, and the iron density is 7.85kg / m 3 The appropriate coefficient δ is 0.2, the furnace iron capacity coefficient is 0.6, the distance from the center line of the tuyere to the upper edge of the furnace is 0.65m, and after the air supply time T1, the material line is 1.3m.

[0077] According to M 层 =V 层 ×ρ 铁 ×ζ 层 , calculate M 层 =308.5×7.85×0.5=1210t;

[0078] According to M 适 =1 / 4×π×D 2 ×h 高度差 ×ρ 铁 ×K×δ, calculate M 适 =1 / 4×3.14×(13.3) 2 ×4.75×7.85×0.6×0.2=621t;

[0079] Known M 休 =490t;

[0080] According to M 正 =M 层 +M 适 -M 休 , calculate M 正=1210+621-490=1341t;

[0081] according to The blast furnace operation data is counted and T1 = 20.5 hours is obtained;

[0082] Calculate V u -V 线 -V 风 =4038-3.14×4.8×4.8×(2-1.3)-650=3337m 3 ;

[0083] After the air supply T1 time, the V o =32.8m 3 , V c =39.5m 3 , the compression coefficient γ is taken as 12%;

[0084] according to Calculate T2 = 6 hours;

[0085] According to T=T1+T2, we get T=26.5 hours, so the most suitable time for tapping iron is 26.5 hours after the furnace is opened.

[0086] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0087] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for predicting the first iron tapping time of a blast furnace, characterized in that: include: Obtain the iron content of the resting material; Calculate the amount of iron in the dead iron layer and the appropriate amount of iron stored in the first iron furnace; Calculate the iron content of the normal material after air supply according to the iron content of the resting material, the iron content of the dead iron layer and the suitable iron storage amount of the first iron furnace steel; The first iron tapping time is obtained according to the normal iron content of the material after air supply and the material feeding speed.

2. A method for predicting the first iron tapping time of a blast furnace according to claim 1, characterized in that: The amount of iron in the dead iron layer is calculated as follows: M 层 =V 层 ×ρ 铁 ×ζ 层 Among them, M 层 is the amount of iron in the dead iron layer, V 层 is the volume of the dead iron layer in the blast furnace, ρ 铁 is the density of molten iron, ζ 层 is the iron capacity coefficient of the dead iron layer.

3. A method for predicting the first iron tapping time of a blast furnace according to claim 1 or 2, characterized in that: The suitable iron storage amount of the first iron furnace steel is calculated as follows: M 适 =1 / 4×π×D 2 ×h 高度差 ×ρ 铁 ×K×δ Among them, M 适 is the appropriate iron storage capacity of the first iron furnace steel, D is the furnace diameter, h is 高度差 is the height difference between the center line of the tuyere and the center line of the taphole, ρ 铁 is the density of molten iron, K is the furnace iron capacity coefficient, and δ is the suitable coefficient.

4. A method for predicting the first iron tapping time of a blast furnace according to claim 1 or 2, characterized in that: The iron content of the normal material after air supply is calculated according to the iron content of the air-resting material, the iron content of the dead iron layer and the suitable iron storage amount of the first iron furnace steel, and is calculated in the following way: M 正 =M 层 +M 适 -M 休 Among them, M 正 is the normal iron content of the material after air supply, M 层 is the amount of iron in the dead iron layer, M 适 is the appropriate iron storage amount of the first iron furnace steel, M 休 is the iron content of the resting material.

5. The method for predicting the first iron tapping time of a blast furnace according to claim 1, characterized in that: Obtaining the first iron tapping time according to the normal material iron content after air supply and the material feeding speed includes: Providing multiple batches of normal materials according to the iron content of the normal materials after air supply, wherein the sum of the iron content of the multiple batches of normal materials is equal to the iron content of the normal materials after air supply; Feeding multiple batches of the normal materials at the feeding speed, calculating the time for adding the multiple batches of the normal materials into the furnace and the smelting period for the multiple batches of the normal materials to be fed into the furnace; The first iron tapping time is obtained by adding the time for adding multiple batches of the normal materials into the furnace and the smelting period for the multiple batches of the normal materials to be put into the furnace.

6. A method for predicting the first iron tapping time of a blast furnace according to claim 5, characterized in that: The time for adding multiple batches of normal materials into the furnace is calculated as follows: Wherein, T1 is the time for adding multiple batches of normal materials into the furnace, Q i批铁 is the normal material of the i-th batch, N i is the feeding speed, M 正 It is the normal iron content of the material after air supply.

7. A method for predicting the first iron tapping time of a blast furnace according to claim 5, characterized in that: The smelting cycle of multiple batches of normal materials to the furnace is calculated as follows: Wherein, μ is the material speed correction coefficient, T2 is the smelting cycle of multiple batches of normal materials to furnace steel, N i is the feeding speed, V u is the effective working volume of the blast furnace, V 线 V is the throat volume above the material line, 风 V is the effective volume of the blast furnace below the tuyere, o is the volume of ore in each batch, V c is the volume of coke in each batch of material, and γ is the compression coefficient of the charge in the furnace.

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