A prediction and treatment method for the stock hanging accident of a blast furnace at the 2000 level

Abstract

The present application provides a method for predicting and treating the hanging stock accident of a blast furnace at the 2000 level. The method includes: obtaining the current operating parameters of the blast furnace, the air volume, air pressure, top pressure, differential pressure at the previous acquisition moment, and the number of times the burden gauge has become sluggish within the current preset time period; if the change ranges of the current air volume, current air pressure, current top pressure, and current differential pressure compared with the air volume, air pressure, top pressure, and differential pressure at the previous acquisition moment are respectively less than the target air volume change value, greater than the target air pressure change value, greater than the target top pressure change value, and greater than the target differential pressure change value; and the differences between the current air pressure and the reference air pressure, the current top pressure and the reference top pressure, and the current differential pressure and the reference differential pressure are respectively greater than the target air pressure difference, the target top pressure difference, and the target differential pressure difference, and the number of times the burden gauge has become sluggish within the current preset time period exceeds the target sluggish number, then it is determined that the current operating condition is a sign before the occurrence of the hanging stock phenomenon. This solution has relatively accurate prediction.

Description

Technical Field

[0001] The present invention relates to the field of blast furnace ironmaking in the chemical industry, and particularly to a method for predicting and treating stock hanging accidents in 2000-level blast furnaces. Background Art

[0002] When the burden stops descending and its continuous time exceeds more than 2 batches of materials, it is called stock hanging. It can be divided into upper stock hanging, lower stock hanging, hot stock hanging, cold stock hanging, and stubborn stock hanging. Stubborn stock hanging refers to stock hanging that has been forced down three times or more. Some also call stock hanging that lasts for more than 4 hours as malignant stock hanging. Generally, for a stock-hanging blast furnace, only part of the blast volume is accepted, and only oxygen reduction and blast reduction are needed to force down the stock. In the case of severe stock hanging, the blast furnace does not accept the blast volume, and it is necessary to relieve the blast to force down the stock, which seriously affects the smooth operation of the blast furnace. Therefore, it is very necessary to find a method for predicting stock hanging in a blast furnace, giving an early warning in time before the occurrence of stock hanging in the blast furnace, reminding the operator to adjust and control in time, so as to eliminate the stock hanging accident in the blast furnace at the budding stage.

[0003] In recent years, with the enlargement of blast furnaces and the improvement of equipment levels, the functions of equipment have been continuously improved and perfected. At the same time, the level of burden preparation in blast furnaces has also been significantly improved, and the operation technology has also made great progress. In blast furnace production, the occurrence of abnormal furnace conditions such as stubborn stock hanging has been greatly reduced. However, due to the extremely complex blast furnace production system and numerous influencing factors, sometimes several unfavorable factors occur unexpectedly, and it may be "one misfortune after another", and it is still possible to cause stubborn stock hanging accidents, bringing huge losses to blast furnace production.

[0004] In the existing technical solutions, in order to predict the stock hanging phenomenon, relevant researchers have developed technical solutions for predicting blast furnace stock hanging by using mathematical algorithms, such as using the binary tree classifier algorithm, the twin hypersphere support vector method, the PCA-ICA process monitoring method to monitor the blast furnace process and design fault identification indicators, and designing the ABC (artificial bee colony) algorithm to optimize the input weights and hidden layer thresholds of the extreme learning machine (ELM), establishing an optimal extreme learning machine model, and bringing the actual production data into the optimal extreme learning machine model to realize the diagnosis of blast furnace faults. However, these methods all use mathematical algorithms to diagnose blast furnace faults, lack the support of blast furnace process rules, have high false negative rates and false positive rates of the system, and have high requirements for the performance of the computer.

[0005] Therefore, in the existing technical solutions, there is a lack of a technical solution that does not depend on the computer performance, aims at the real-time data of the blast furnace, combines the case characteristics of each blast furnace, and accurately predicts the stock hanging of the blast furnace. Summary of the Invention

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the defect of the prior art that there is a lack of a technical solution for accurately predicting the hanging material of a blast furnace by combining the real-time data of the blast furnace without relying on the computer performance and the case characteristics of each blast furnace, so as to provide a method for predicting and handling the hanging material accident of a 2000-level blast furnace.

[0007] In a first aspect, according to an embodiment of the present application, a method for predicting a hanging material accident of a 2000-level blast furnace is provided, including:

[0008] Step S12: Obtain the current operating parameters of the blast furnace, the air volume, air pressure, top pressure, differential pressure collected at the previous collection moment, and the number of times of the stock rod getting stuck within the current preset time period; the current operating parameters include the current air volume, current air pressure, current top pressure, and current differential pressure.

[0009] Step S141: Determine whether the current air volume, current air pressure, current top pressure, and current differential pressure satisfy: the change range of the current air volume compared with the air volume at the previous collection moment is less than the target air volume change value, the change range of the current air pressure compared with the air pressure at the previous collection moment is greater than the target air pressure change value, and the change range of the current differential pressure compared with the differential pressure at the previous collection moment is greater than the target differential pressure change value; the change range of the current top pressure compared with the top pressure at the previous collection moment is greater than the target top pressure change value; and

[0010] Step S142: If satisfied, continue to determine whether the current air pressure, current top pressure, and current differential pressure also satisfy: the difference between the current air pressure and the reference air pressure is greater than the target air pressure difference, the difference between the current top pressure and the reference top pressure is greater than the target top pressure difference, and the difference between the current differential pressure and the reference differential pressure is greater than the target differential pressure difference.

[0011] Step S143: If satisfied, then continue to determine whether the number of times of the stock rod getting stuck within the current preset time period exceeds the target stuck times.

[0012] If the number of times of the stock rod getting stuck within the current preset time period exceeds the target stuck times, it is determined that the current operating condition is a sign before the hanging material phenomenon occurs.

[0013] In one embodiment, the previous collection moment is 30 minutes before the current moment, and the preset time period is not less than 2 hours before the current moment.

[0014] In one embodiment, the target air volume change value is 20 Nm 3 / min, the target air pressure change value is 10 kPa, the target differential pressure change value is 7 kPa, and the target top pressure change value is 3 kPa.

[0015] In one embodiment, the target air pressure difference is 20 kPa, the target top pressure difference is 5 kPa, and the target pressure difference is 15 kPa;

[0016] In one embodiment, the target number of stagnations is 3.

[0017] In one embodiment, the judgment criterion for the burden gauge showing a stagnant phenomenon is as follows:

[0018] When the burden gauge floats, the stock line is lower than the target stock line value, the material feeding time is higher than the target material feeding time, and the material feeding speed is lower than the target material feeding speed;

[0019] Wherein:

[0020] The target stock line value is 1.2 m, the target material feeding time is 2.5 min, and the target material feeding speed is 5.0 cm / min.

[0021] In one embodiment, the method further includes:

[0022] Obtain the historical data of the blast furnace, and select the historical case data of the hanging stock accident of the 2000-level blast furnace from the historical data; wherein, the standard for selecting the historical case data of the hanging stock accident of the 2000-level blast furnace is that the descending amplitude of the real-time sounding value within the preset time period is lower than the target descending amplitude, and the duration of the descending amplitude being lower than the target descending amplitude is longer than the descending time of 2 batches of materials;

[0023] For the historical case data, analyze the changes in air volume, air pressure, top pressure, pressure difference, temperature changes of the cross thermocouple gun, top temperature, heat load, temperatures of cast iron and copper cooling staves, the difference between the current air pressure and the reference air pressure, the difference between the current top pressure and the reference top pressure, the difference between the current pressure difference and the reference pressure difference, and the number of stagnations of the sounding within half an hour to one hour before the occurrence of the pipeline accident;

[0024] Based on the analysis results of the historical case data, determine the three judgment conditions of step S141, step S142, and step S143.

[0025] In one embodiment, the method further includes:

[0026] Determine the change curves of air volume and air pressure, air volume and top pressure during the blast furnace reblowing process;

[0027] Based on the determined change curves of air volume and air pressure, air volume and top pressure during the blast furnace reblowing process, fit them using a linear formula to obtain the first linear relationship between air pressure and air volume and the second linear relationship between top pressure and air volume;

[0028] Determine the corresponding reference air pressure and reference top pressure according to the current air volume, the first linear relationship, and the second linear relationship;

[0029] The reference differential pressure is obtained by subtracting the reference top pressure from the reference wind pressure.

[0030] In a second aspect, according to an embodiment of the present application, a method for handling the hanging burden accident of a 2000-level blast furnace is provided, which is used to adjust the operating condition of the blast furnace whose current operating condition determined by any one of the above is a sign before the hanging burden phenomenon occurs. The handling method includes:

[0031] If the current furnace temperature of the blast furnace is higher than the target furnace temperature, take the first measure; the first measure is: reduce the blast temperature by 20 - 30 °C and avoid 2 t / h of coal.

[0032] If the differential pressure in the blast furnace is still higher than the target differential pressure value after taking the first measure, reduce the blast volume entering the furnace at a preset rate.

[0033] If the differential pressure at the lower part of the blast furnace is higher than the target differential pressure value, and the stored slag and iron are higher than the target stored slag and iron value, increase the slag and iron tapping rate by a preset target amplitude; if the coke thermal strength is lower than the target coke strength value, reduce the ore-coke ratio.

[0034] If the differential pressure at the upper part of the blast furnace is high, and the particle size and powder content of the blast furnace raw materials are abnormal, increase the coke ratio by 10 - 15 kg / t.

[0035] If the differential pressure in the middle part of the blast furnace is high, and the ore softening performance index does not meet the requirements of the ore softening performance index, or the ore softening performance is abnormal, adjust the raw material ratio.

[0036] The technical solution of the present invention has the following advantages:

[0037] The prediction method for the hanging burden accident of a 2000-level blast furnace provided by the embodiment of the present application is based on the current blast volume, current blast pressure, current top pressure and current differential pressure of the blast furnace, and depends on the blast volume, blast pressure, top pressure, differential pressure collected at the previous acquisition moment and the number of times of the stock rod stagnation phenomenon within the preset time period up to the current time; the current operating parameters include the current blast volume, current blast pressure, current top pressure and current differential pressure, and it is judged whether the conditions of step S141, step S142 and step S143 are met. If they are met, it is determined that the current operating condition is a precursor to an impending hanging burden accident, and a warning can be given for the hanging burden accident of the blast furnace, and then adjustment measures can be taken in time, thereby effectively avoiding the occurrence of the hanging burden accident of the blast furnace.

[0038] In addition, the prediction method for the hanging burden accident of a 2000-level blast furnace provided by the embodiments of the present application sets the determination conditions before the occurrence of the hanging burden accident of the blast furnace based on the historical operation parameters of the blast furnace, and uses them as the basis for determining whether there are precursors of the hanging burden accident according to the current operation parameters of the blast furnace, the air volume, air pressure, top pressure, differential pressure collected at the previous acquisition moment, and the number of times of sluggishness of the burden gauge within the preset time period up to the current time. In this solution, according to the common characteristics before the occurrence of the hanging burden accident in the blast furnace, the prediction standard for the hanging burden is formulated, thereby effectively ensuring the accuracy of the prediction of the occurrence of the hanging burden accident in the blast furnace.

[0039] The treatment method for the hanging burden accident of a 2000-level blast furnace provided by the embodiments of the present application can effectively handle the current operation status of the blast furnace that is about to have a hanging burden accident, effectively avoid the occurrence of the hanging burden accident in the blast furnace, and thus nip the hanging burden accident in the bud. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0041] Figures 1-3 Respectively, they are the flowcharts of the prediction method for the hanging burden accident of a 2000-level blast furnace provided in an embodiment of the present application;

[0042] Figure 4 They are the change curves of the air volume and air pressure of the No. 2 blast furnace in an embodiment of the present application;

[0043] Figure 5 They are the change curves of the air volume and top pressure of the No. 2 blast furnace in an embodiment of the present application;

[0044] Figure 6 They are the change curves of the air volume and air pressure of the No. 3 blast furnace in an embodiment of the present application;

[0045] Figure 7 They are the change curves of the air volume and top pressure of the No. 3 blast furnace in an embodiment of the present application;

[0046] Figure 8 They are the flowcharts of the treatment method for the hanging burden accident of a 2000-level blast furnace provided in an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0047] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0048] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0049] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and can also be the communication inside two elements. It can be a wireless connection or a wired connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0050] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0051] Embodiment 1

[0052] The embodiment of the present application provides a prediction method for the hanging stock accident of a 2000-level blast furnace, characterized in that the method includes:

[0053] Step S12: Obtain the current operating parameters of the blast furnace, the air volume, air pressure, top pressure, differential pressure collected at the previous collection moment, and the number of times of the sluggish phenomenon of the burden gauge within the preset time period up to the current time; the current operating parameters include the current air volume, current air pressure, current top pressure, and current differential pressure;

[0054] In the embodiment of the present application, based on the historical case data of the blast furnace, combined with the current operating parameters and the operating parameters within a set time period, subsequent judgment is made on whether the blast furnace will have a hanging stock accident. Specifically, the operating parameters within the set time period include the air volume, air pressure, top pressure, differential pressure collected at the previous acquisition moment, and the number of times the burden gauge has become sluggish within the current preset time period, and the analysis result of the historical case data of the blast furnace is used as the criterion for judging whether a hanging stock accident will occur. As a specific embodiment, the historical case data of the blast furnace can be analyzed first to determine the judgment conditions for an impending hanging stock accident. As a specific embodiment, the judgment conditions determined according to the historical case data of the blast furnace in the present application are as follows in steps S141 - S143.

[0055] Step S141: Judge whether the current air volume, current air pressure, current top pressure, and current differential pressure meet the following conditions: the change range of the current air volume compared with the air volume at the previous acquisition moment is less than the target air volume change value, and the change range of the current air pressure compared with the air pressure at the previous acquisition moment is greater than the target air pressure change value, and the change range of the current differential pressure compared with the differential pressure at the previous acquisition moment is greater than the target differential pressure change value; the change range of the current top pressure compared with the top pressure at the previous acquisition moment is greater than the target top pressure change value; and

[0056] Step S142: If it is satisfied, continue to judge whether the current air pressure, current top pressure, and current differential pressure also meet the following conditions: the difference between the current air pressure and the reference air pressure is greater than the target air pressure difference, the difference between the current top pressure and the reference top pressure is greater than the target top pressure difference, and the difference between the current differential pressure and the reference differential pressure is greater than the target differential pressure difference;

[0057] Step S143: If it is satisfied, then continue to judge whether the number of times the burden gauge has become sluggish within the current preset time period exceeds the target sluggish number;

[0058] In the embodiment of the present application, after obtaining the current air volume, current air pressure, current top pressure, and current differential pressure of the 2000-level blast furnace, first judge whether the first judgment condition is met. Before the hanging stock phenomenon occurs, the air volume of the blast furnace suddenly decreases, while the air pressure suddenly rises; or the air pressure suddenly rises, but the air volume does not increase proportionally but shows a straight line; the differential pressure suddenly rises and the top pressure is slightly higher. Therefore, the first judgment condition is set for the current air volume, current air pressure, current top pressure, and current differential pressure. The specific judgment condition is that the change range of the current air volume compared with the air volume at the previous acquisition moment is less than the target air volume change value, and the change range of the current air pressure compared with the air pressure at the previous acquisition moment is greater than the target air pressure change value, and the change range of the current differential pressure compared with the differential pressure at the previous acquisition moment is greater than the target differential pressure change value; the change range of the current top pressure compared with the top pressure at the previous acquisition moment is greater than the target top pressure change value;

[0059] After the current air volume, current blast pressure, current top pressure, and current differential pressure in the currently obtained operating parameters of the blast furnace satisfy the previous judgment condition, based on the deviation between the air volume charged into the blast furnace and the burden permeability index before the stock hanging accident, that is, the current air volume charged into the furnace is small, but the actual blast pressure and actual differential pressure are already significantly higher than the reference blast pressure and reference top pressure, resulting in a significant decrease in the permeability index. Therefore, another corresponding judgment condition is that the difference between the current blast pressure and the reference blast pressure is greater than the target blast pressure difference, the difference between the current top pressure and the reference top pressure is greater than the target top pressure difference, and the difference between the current differential pressure and the reference differential pressure is greater than the target differential pressure difference;

[0060] Further, in the embodiment of the present application, after the current blast pressure, current top pressure, and current differential pressure satisfy the judgment conditions in step S142, it is continuously determined whether the burden gauge shows a sluggish phenomenon within a preset time period, and whether the number of times of the sluggish phenomenon within the preset time period exceeds the target sluggish number. The target sluggish number can be set according to actual needs, such as 3 times; it is pointed out here that the judgment standard for the burden gauge showing a sluggish phenomenon is based on the burden line, the material discharging time, and the material discharging speed.

[0061] Step S16: If the number of times the burden gauge shows a sluggish phenomenon within the current preset time period exceeds the target sluggish number, it is determined that the current operating condition is a sign before the occurrence of the stock hanging phenomenon.

[0062] In the embodiment of the present application, when the judgment result of step S143 is that the number of times the burden gauge shows a sluggish phenomenon within the current preset time period exceeds the target sluggish number, it is determined that the current operating condition of the blast furnace is a sign before the occurrence of the stock hanging phenomenon.

[0063] As an optional embodiment of the present application, the previous acquisition moment involved is 30 minutes before the current moment. For example, if the change range of the current differential pressure compared with the differential pressure at the previous acquisition moment is less than the target differential pressure change value, it can be understood that the change range of the differential pressure corresponding to the current moment is smaller than the change range of the differential pressure collected 30 minutes ago; another example is that if the change range of the current top pressure compared with the top pressure at the previous acquisition moment is greater than the target top pressure change value, it can be understood that the change range of the top pressure corresponding to the current moment is larger than the change range of the top pressure collected 30 minutes ago.

[0064] As an alternative embodiment of the present application, the preset time period mentioned in the present application is not less than 2 hours before the current moment. As an alternative and preferred embodiment, the preset time period may be 2 hours before the current moment. For example, the "number of times the burden gauge has become sluggish within the current preset time period" involved in the present application may be the number of times the burden gauge has become sluggish within 2 hours before the current moment. It should be noted here that listing the preset time period as 2 hours before the current moment is only for the convenience of describing the specific embodiments involved in the present application, and is not used for specifically limiting the preset time period involved in the present application. Similarly, for the previous acquisition moment, it is also for the convenience of describing the specific embodiments, and is not a specific limitation on the previous acquisition moment. A technical solution that only changes the specific values of the previous acquisition moment and / or the preset time period without making creative labor still falls within the protection scope of the present application.

[0065] Further, in the embodiment of the present application, the target air volume change value is 20 Nm 3 / min, the target air pressure change value is 10 kPa, the target differential pressure change value is 7 kPa, and the target top pressure change value is 3 kPa. That is, the specific judgment condition in step S141 may be that the air volume change < 20 Nm 3 / min, and the air pressure change > 10 kPa, and the differential pressure change > 7 kPa, and the top pressure change > 3 kPa, and the time difference is 30 min.

[0066] Meanwhile, in the embodiment of the present application, the target air pressure difference is 20 kPa, the target top pressure difference is 5 kPa, and the target differential pressure difference is 15 kPa; that is, in step S142, it is judged that the difference between the current air pressure and the reference air pressure is greater than 20 kPa, the difference between the current top pressure and the reference top pressure is greater than 5 kPa, and the difference between the current differential pressure and the reference differential pressure is greater than 15 kPa.

[0067] Meanwhile, in the embodiment of the present application, the target number of sluggish times is 3. That is, in step S143, it is judged whether the number of times the blast furnace has become sluggish within the recent 2 hours exceeds 3 times.

[0068] Further, in the embodiment of the present application, the judgment criterion for determining that the burden gauge has become sluggish is:

[0069] When the burden gauge is floating, the stock line is lower than the target stock line value, and the charging time is higher than the target charging time, and the charging speed is lower than the target charging speed; where: the target stock line value is 1.2 m, the target charging time is 2.5 min, and the target charging speed is 5.0 cm / min.

[0070] Further, as shown in Figure 2 shown, the method further includes:

[0071] Step S101: Obtain the historical data of the blast furnace, and select the historical case data of the hanging stock accident of the 2000-level blast furnace from the historical data. Among them, the criteria for selecting the historical case data of the hanging stock accident of the 2000-level blast furnace are: the decline rate of the real-time stock line value within the preset time period is lower than the target decline rate, and its duration is longer than the decline time of 2 batches of materials.

[0072] Step S102: For the historical case data, analyze the changes in air volume, blast pressure, top pressure, differential pressure, temperature of the cross thermocouple gun, top temperature, heat load, temperature of cast iron and copper cooling walls, the difference between the current blast pressure and the reference blast pressure, the difference between the current top pressure and the reference top pressure, the difference between the current differential pressure and the reference differential pressure, and the number of times the stock rod becomes sluggish.

[0073] Step S103: Based on the analysis results of the historical case data, determine the three judgment conditions of Step S141, Step S142, and Step S143.

[0074] In the embodiment of the present application, first, based on the historical case data of the blast furnace, determine the three judgment conditions of Step S141, Step S142, and Step S143. In order to obtain the precursors for determining whether the blast furnace is about to have a hanging stock accident, first, obtain the historical data of the blast furnace, and select the historical case data of the hanging stock accident of the 2000-level blast furnace from the historical data. Then, based on the selected historical case data, analyze the changes in blast pressure and air volume, and differential pressure within half an hour to one hour, and at the same time record the number of times the stock rod shows a lag phenomenon within 2 hours before the hanging stock accident, and then determine the three judgment conditions of Step S141, Step S142, and Step S143, which are used as the basis for subsequent determination of whether the current operating parameters are precursors of a hanging stock accident.

[0075] In the embodiment of the present application, as shown in Figure 3 The method further includes:

[0076] Step S111: Determine the change curves of air volume and blast pressure, and air volume and top pressure during the blast furnace reblowing process.

[0077] Step S112: Based on the determined change curves of air volume and blast pressure, and air volume and top pressure during the blast furnace reblowing process, fit them using a linear formula to obtain the first linear relationship between blast pressure and air volume, and the second linear relationship between top pressure and air volume.

[0078] Step S113: Determine the corresponding reference blast pressure and reference top pressure according to the current air volume, the first linear relationship, and the second linear relationship.

[0079] Step S114: Obtain the reference differential pressure according to the reference blast pressure and the reference top pressure.

[0080] In the embodiment of the present application, in the specific determination process, the reference air volume, reference air pressure, and reference differential pressure corresponding to the current operating parameters are used. Therefore, in this solution, first, the reference air volume, reference air pressure, and reference differential pressure corresponding to the current operating parameters are determined, mainly by fitting the change curves of the air volume and air pressure, and the air volume and top pressure during the blast furnace reblowing process to obtain the first linear relationship between the air pressure and the air volume, and the second linear relationship between the top pressure and the air volume. Then, based on the current air volume in the current operating parameters of the blast furnace and the determined first and second linear relationships, the corresponding reference air pressure and reference top pressure are determined. Among them, the first linear relationship can be the linear relationship between the current air volume and the reference air pressure, and the second relationship can be the linear relationship between the current air volume and the reference top pressure.

[0081] The following is a specific embodiment for illustration:

[0082] Step 1: Determine the relationships of the reference air pressure and reference top pressure of BF No. 2 and BF No. 3.

[0083] In the embodiment of the present application, the reference air pressure and reference top pressure of BF No. 2 and BF No. 3 are obtained according to the change curves of the corresponding air volume and air pressure, and the air volume and top pressure during the reblowing process of the corresponding blast furnace, and then the first linear relationship between the air pressure and the air volume, and the second linear relationship between the top pressure and the air volume are obtained. Then, based on the current air volume in the historical cases of the blast furnace and the determined first and second linear relationships, the corresponding reference air pressure and reference top pressure are determined. Finally, the reference differential pressure is obtained by subtracting the reference air pressure from the reference top pressure. See Figures 4-7 。

[0084] Step 2: Obtain the historical data of the blast furnace, and select the historical case data of the BF suspension accidents at the 2000 level from the historical data; this application mainly focuses on BF No. 2 and BF No. 3.

[0085] Step 3: Analyze the changes in the blast furnace parameters within half an hour before the suspension accident for the historical case data. The specific parameters are shown in Tables 1 - 3.

[0086] Table 1 Historical case data of BF at the 2000 level (current air volume, current air pressure, current top pressure, current differential pressure, air volume change, air pressure change, differential pressure change, top pressure change)

[0087]

[0088]

[0089] Table 2 Historical case data of BF at the 2000 level (reference air pressure, reference top pressure, reference differential pressure, air pressure difference, top pressure difference, differential pressure difference, number of times of stock rod sluggishness)

[0090]

[0091] Table 3 Historical Case Data of 2000-level Blast Furnaces (Cross Temperature Measurement, Edge Temperature Change, Top Temperature / Average Value Change, Top Temperature / Uniformity, Heat Load Change, Cast Iron / 27m Temperature Change, Copper / 25m Temperature Change, Copper / 23m Temperature Change, Copper / 21m Temperature Change)

[0092]

[0093] Step 4: From the results of the above historical case data, it can be seen that compared with half an hour ago, the blast volume of the cases in Table 1 is decreasing, with some having a large amplitude and some having an insignificant amplitude. However, the blast pressure is increasing significantly (the increase amplitude exceeds the target blast pressure difference), and the differential pressure also increases synchronously with the blast pressure (the increase amplitude exceeds the target differential pressure difference), and the top pressure increases slightly. Thus, the first judgment condition for stock hanging is determined, that is, step S141; the blast pressure difference, top pressure difference, and differential pressure difference of all cases are relatively large, indicating that the current blast pressure, current top pressure, and current differential pressure are significantly higher than the reference blast pressure, reference top pressure, and reference differential pressure corresponding to the current blast volume. Thus, the second judgment condition for the stock hanging accident is determined, that is, step S142; in all cases, the number of times the sounding rod is sluggish within 2 hours is significantly higher than the average level during normal operation of the blast furnace. Thus, the third judgment condition for the stock hanging accident is determined, that is, step S143, while the changes in other parameters have both positive and negative growth and are not representative.

[0094] Step 5: Obtain the current operating parameters. For example, the operating parameters and calculated parameter changes of the No. 3 blast furnace at two time points are shown in Table 4-5. It can be seen from Table 4-5 that the current operating parameters and calculated parameters of the No. 3 blast furnace at 12:30 on November 8, 2021, meet the judgment conditions for the stock hanging accident, and it is determined that the current operating condition is a precursor to an impending stock hanging accident; while at 14:25 on November 9, 2021, some parameters of the blast furnace do not meet the judgment conditions for the stock hanging accident, and it is determined that there is no precursor to the stock hanging accident in the current operating condition of the blast furnace.

[0095] Table 4 Current Operating Parameters and Calculated Parameters of No. 3 Blast Furnace (Current Blast Volume, Current Blast Pressure, Current Top Pressure, Current Differential Pressure, Blast Volume Change, Blast Pressure Change, Differential Pressure Change, Top Pressure Change)

[0096]

[0097] Table 5 Current Operating Parameters and Calculated Parameters of No. 3 Blast Furnace (Reference Blast Pressure, Reference Top Pressure, Reference Differential Pressure, Blast Pressure Difference, Top Pressure Difference, Differential Pressure Difference, Number of Times the Sounding Rod is Sluggish, Whether there are Signs of Stock Hanging)

[0098]

[0099] The prediction method for the hanging stock accident of a 2000-level blast furnace provided by the embodiment of the present application is based on the current blast volume, current blast pressure, current top pressure and current differential pressure of the blast furnace, and depends on the blast volume, blast pressure, top pressure, differential pressure collected at the previous collection moment, and the number of times of sluggishness of the burden gauge within the current preset time period; the current operating parameters include the current blast volume, current blast pressure, current top pressure and current differential pressure, and it is judged whether the conditions of step S141, step S142 and step S143 are met. If they are met, it is determined that the current operating condition is a precursor to an impending hanging stock accident, and a warning can be given for the hanging stock accident of the blast furnace, and then adjustment measures can be taken in time, thereby effectively avoiding the occurrence of the hanging stock accident of the blast furnace.

[0100] In addition, the prediction method for the hanging stock accident of a 2000-level blast furnace provided by the embodiment of the present application sets the determination conditions before the occurrence of the hanging stock accident of the blast furnace according to the historical operating parameters of the blast furnace, as the determination basis for determining whether there is a precursor to the hanging stock accident based on the current operating parameters of the blast furnace, the blast volume, blast pressure, top pressure, differential pressure collected at the previous collection moment, and the number of times of sluggishness of the burden gauge within the current preset time period. In this solution, according to the common characteristics before the historical hanging stock accident of the blast furnace, the prediction standard for hanging stock is formulated, thereby effectively ensuring the accuracy of the prediction of the occurrence of the hanging stock accident of the blast furnace.

[0101] Embodiment 2

[0102] The embodiment of the present application also provides a processing method for the hanging stock accident of a 2000-level blast furnace, which is used to adjust the operating condition of the blast furnace whose current operating condition is determined as a sign before the occurrence of the hanging stock phenomenon in the previous embodiment. See Figure 8 As shown, the processing method includes:

[0103] Step S21: If the current furnace temperature is higher than the target furnace temperature (the percentage of Si content in hot metal is 0.6%), take the first measure; the first measure is: reduce the blast temperature by 20 - 30°C and avoid coal by 2t / h;

[0104] Step S22: If the differential pressure in the blast furnace is still higher than the target differential pressure value after the target time period of taking the first measure, reduce the blast volume entering the furnace at a preset rate (5% of the normal blast volume each time) until the current differential pressure of the blast furnace drops; if the blast volume has been reduced to less than 10% of the normal blast volume and the differential pressure of the blast furnace is still higher than the target differential pressure value, while reducing the blast at a preset rate, it is necessary to reduce the top pressure by 10 kPa at a preset frequency.

[0105] Step S23: If the differential pressure below the first height of the blast furnace is higher than the target differential pressure value and the slag and iron storage value in the blast furnace is higher than the target slag and iron storage value, increase the slag and iron tapping rate by a preset target amplitude; if the coke thermal strength is lower than the target coke strength value, reduce the ore-coke ratio;

[0106] Step S24: If the differential pressure above the second height of the blast furnace is high, and the particle size of the original fuel of the blast furnace is lower than the target particle size value and the powder content ratio of the raw materials is higher than the target ratio, then increase the coke ratio by 10 - 15 kg / t;

[0107] Step S25: If the differential pressure in the part between the first height and the second height of the blast furnace is higher than the preset differential pressure value and the softening performance of the ore is abnormal, then adjust the raw fuel ratio; the first height is lower than the second height;

[0108] If the differential pressure in the middle of the blast furnace is high and the softening range of the ore exceeds the target range by 100 °C, and it is further found that this is mainly because the softening range of the sinter exceeds the target softening range, then it is necessary to promptly adjust and optimize the sinter blending structure.

[0109] As a specific embodiment, the first height can be one - third of the furnace height from the bottom of the blast furnace, and the second height is one - third of the furnace height from the top of the blast furnace.

[0110] The method for handling the hanging - charge accident of a 2000 - level blast furnace provided by the embodiment of the present application first judges the current furnace temperature of the blast furnace. If the current furnace temperature is higher than the target furnace temperature, then immediately reduce the blast temperature by 20 - 30 °C and reduce the coal by 2 t / h for avoidance. If the differential pressure still does not drop, that is, after taking the above - mentioned first measure, the differential pressure in the blast furnace is still higher than the target differential pressure value, then appropriately reduce the blast volume of the blast furnace, that is, reduce the blast volume entering the furnace at a preset rate; and if the cause is not clear, then immediately reduce the blast volume entering the blast furnace by a preset amplitude. After the target reduction time period, gradually reduce the top pressure of the blast furnace; if the differential pressure in the lower part of the blast furnace is higher than the target differential pressure value and the slag - iron storage is higher than the target slag - iron storage value, it indicates that the differential pressure in the lower part is high. If at the same time the slag - iron storage of the blast furnace is higher than the target slag - iron storage value, then increase the slag - iron tapping rate by a preset target amplitude, that is, strengthen the slag - iron tapping; if the coke thermal strength is lower than the target coke strength value, it indicates that the coke thermal strength is poor, then implement the withdrawal of ore - coke ratio process; if the differential pressure in the upper part of the blast furnace is high and the particle size and powder content of the original fuel of the blast furnace are abnormal, then increase the coke ratio by 10 - 15 kg / t; if the differential pressure in the middle of the blast furnace is high and the softening performance of the ore is abnormal, then adjust the raw fuel ratio. Through this solution, it is possible to effectively handle the current operating conditions of the blast furnace for an impending hanging - charge accident, effectively avoid the occurrence of the hanging - charge accident of the blast furnace, and thus nip the hanging - charge accident of the blast furnace in the bud.

[0111] The prediction method for the stock hanging accident of a 2000-level blast furnace provided in the embodiments of the present application uses the historical real-time data of the blast furnace and combines the characteristic data when the stock hanging accident occurs in the blast furnace case to predict the stock hanging accident of the blast furnace. When it is predicted that the current operating condition is a precursor to the occurrence of a stock hanging accident, the operating conditions and operating parameters of the blast furnace are adjusted by using the treatment method for the stock hanging accident of a 2000-level blast furnace provided in the present application, so as to nip the stock hanging accident of the blast furnace in the bud. This solution is based on the analysis and prediction of the historical data of the blast furnace stored in the database, without involving strong practicability and higher accuracy.

[0112] Obviously, the above embodiments are merely examples for clear illustration and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or alterations can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or alterations derived therefrom still fall within the protection scope of the present invention.

Claims

1. A prediction method for the hanging charge accident of a blast furnace at the 2000 level, characterized in that, the method includes: Step S12: Obtain the current operating parameters of the blast furnace, the air volume, air pressure, top pressure, differential pressure collected at the previous collection moment, and the number of times the burden gauge has shown a sluggish phenomenon within the current preset time period; the current operating parameters include the current air volume, current air pressure, current top pressure, and current differential pressure; Step S141: Judge whether the current air volume, current air pressure, current top pressure, and current differential pressure satisfy: the change range of the current air volume compared with the air volume at the previous collection moment is less than the target air volume change value, and the change range of the current air pressure compared with the air pressure at the previous collection moment is greater than the target air pressure change value, and the change range of the current differential pressure compared with the differential pressure at the previous collection moment is greater than the target differential pressure change value; the change range of the current top pressure compared with the top pressure at the previous collection moment is greater than the target top pressure change value; and Step S142: If satisfied, continue to judge whether the current air pressure, current top pressure, and current differential pressure also satisfy: the difference between the current air pressure and the reference air pressure is greater than the target air pressure difference, the difference between the current top pressure and the reference top pressure is greater than the target top pressure difference, and the difference between the current differential pressure and the reference differential pressure is greater than the target differential pressure difference; Step S143: If satisfied, then continue to judge whether the number of times the burden gauge has shown a sluggish phenomenon within the current preset time period exceeds the target sluggish number; Step S16: If the number of times the burden gauge has shown a sluggish phenomenon within the current preset time period exceeds the target sluggish number, then determine that the current operating condition is a sign before the hanging charge phenomenon occurs; The method further includes: Determine the change curves of the air volume and air pressure, air volume and top pressure during the blast furnace reblowing process, and perform fitting using a linear formula to obtain the first linear relationship between the air pressure and the air volume, and the second linear relationship between the top pressure and the air volume; Determine the reference air pressure and reference top pressure according to the current air volume, the first linear relationship, and the second linear relationship; Obtain the reference differential pressure according to the reference air pressure and reference top pressure.

2. The method according to claim 1, characterized in that, the previous collection moment is 30 minutes before the current moment, and the preset time period is not less than 2 hours before the current moment.

3. The method according to claim 1, characterized in that, The target air volume change value is 20 Nm 3 / min, the target wind pressure change value is 10 kPa, the target differential pressure change value is 7 kPa, and the target top pressure change value is 3 kPa.

4. The method according to claim 1, characterized in that, the target air pressure difference is 20 kPa, the target top pressure difference is 5 kPa, and the target differential pressure difference is 15 kPa.

5. The method according to claim 1, characterized in that, the target sluggish number is 3.

6. The method according to claim 5, characterized in that, the judgment criterion for the burden gauge showing a sluggish phenomenon is: When the burden gauge is floating, the stock line is lower than the target stock line value, and the charging time is higher than the target charging time, and the charging speed is lower than the target charging speed; Wherein: the target stock line value is 1.2 m, the target charging time is 2.5 min, and the target charging speed is 5.0 cm / min.

7. The method according to any one of claims 1-6, characterized in that, further includes: Obtain the historical data of the blast furnace, and select the historical case data of the hanging stock accident of the 2000-level blast furnace from the historical data; among them, the criteria for selecting the historical case data of the hanging stock accident of the 2000-level blast furnace are: the decrease amplitude of the real-time sounding value within the preset time period is lower than the target decrease amplitude, and its duration is longer than the decrease time of 2 batches of materials; For the historical case data, analyze the changes in air volume, blast pressure, top pressure, differential pressure, temperature of the cross thermocouple gun, top temperature, heat load, temperatures of cast iron and copper cooling stave, the difference between the current blast pressure and the reference blast pressure, the difference between the current top pressure and the reference top pressure, the difference between the current differential pressure and the reference differential pressure, and the number of times the sounding becomes sluggish; Based on the analysis results of the historical case data, determine the three judgment conditions of step S141, step S142 and step S143.

8. A method for handling the hanging stock accident of a 2000-level blast furnace, which is used to adjust the operating condition of a blast furnace whose current operating condition determined by any one of claims 1-7 is a sign before the occurrence of the hanging stock phenomenon, Characterized in that, The handling method includes: If the current furnace temperature of the blast furnace is higher than the target furnace temperature, take the first measure; the first measure is: reduce the blast temperature by 20-30°C and reduce the hourly coal volume by 2t / h; If the differential pressure in the blast furnace is still higher than the target differential pressure after the target time period of taking the first measure, reduce the blast volume entering the furnace at a preset rate until the current differential pressure of the blast furnace drops; if the blast volume has been reduced to less than 10% of the normal blast volume and the differential pressure of the blast furnace is still higher than the target differential pressure, while reducing the blast at a preset rate, it is necessary to reduce the top pressure by 10 kPa at a preset frequency; If the differential pressure below the first height of the blast furnace is higher than the target differential pressure and the slag and iron storage value in the blast furnace is higher than the target slag and iron storage value, increase the slag and iron tapping rate by a preset target amplitude; if the coke thermal strength is lower than the target coke strength value, retreat the ore-coke ratio; If the differential pressure above the second height of the blast furnace is high and the raw materials and fuels particle size of the blast furnace is lower than the target particle size value and the powder content ratio of the raw materials is higher than the target ratio, increase the coke ratio by 10-15 kg / t; If the differential pressure between the first height and the second height of the blast furnace is high and the softening and melting performance of the ore is abnormal, adjust the raw material and fuel ratio; the first height is lower than the second height.

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