阅读说明：本技术 一种利用炉料下降速度判断死料柱状态方法 (Method for judging columnar state of dead charge by using descending speed of furnace charge ) 是由 陈令坤 刘栋梁 鲁婷 尹腾 于 2021-07-30 设计创作，主要内容包括：本发明提供一种利用炉料下降速度判断死料柱状态方法,包括以下步骤：获取各个批次的布料后中间火焰区域；获取各个批次的下料速度；获取火焰区域所覆盖的各个数据点通过雷达设备检测到的下料速度；计算每个批次中火焰区域所覆盖的所有数据点对应的下料速度的平均值、最大速度值、最小速度值以及最大速度和最小速度的差值；求取所有批次的下料平均速度的平均值；获取所有批次的下料最大速度中的最大值；获取所有批次的下料最小速度中的最小值；获取所有批次的下料速度差值中的最大值,作为最大差值；计算火焰区域最大速度偏差；根据总最大速度、最大差值、最大速度偏差判断死料柱状态。本发明可实现对高炉死料柱消耗状态评估。(The invention provides a method for judging a dead charge column state by using a furnace burden descending speed, which comprises the following steps of: obtaining the middle flame area after each batch of material distribution; obtaining the blanking speed of each batch; acquiring the blanking speed of each data point covered by the flame area, which is detected by radar equipment; calculating the average value, the maximum speed value, the minimum speed value and the difference value between the maximum speed and the minimum speed of the blanking speed corresponding to all data points covered by the flame area in each batch; calculating the average value of the average speeds of all batches of blanking; obtaining the maximum value of the maximum blanking speeds of all batches; obtaining the minimum value of the minimum blanking speeds of all batches; obtaining the maximum value of the blanking speed difference values of all batches as the maximum difference value; calculating the maximum speed deviation of the flame area; and judging the state of the dead material column according to the total maximum speed, the maximum difference value and the maximum speed deviation. The invention can realize the evaluation of the consumption state of the dead material column of the blast furnace.)

1. A method for judging a dead material column state by using a furnace burden descending speed is characterized by comprising the following steps: the method comprises the following steps:

acquiring the middle flame area after the material distribution of each batch in real time through radar equipment;

obtaining the blanking speed of each batch in real time through radar equipment; the method comprises the steps of acquiring the number of data points covered in a flame area of each batch detected by radar equipment, and acquiring the blanking speed of each data point covered in the flame area of each batch detected by the radar equipment;

calculating the average value, the maximum speed value, the minimum speed value and the difference value between the maximum speed and the minimum speed of the blanking speed respectively corresponding to all data points covered by the flame area in each batch, and taking the average speed, the maximum speed, the minimum speed and the difference value as the average speed, the maximum speed, the minimum speed and the difference value of the blanking speed of the corresponding batch;

calculating the average value of the average speeds of all batches of blanking as a total average speed;

acquiring the maximum value of the maximum blanking speeds of all batches as the total maximum speed;

acquiring the minimum value of the minimum blanking speeds of all batches as a total minimum speed;

obtaining the maximum value of the blanking speed difference values of all batches as the maximum difference value;

calculating the maximum speed deviation of the flame area;

and judging the state of the dead material column according to the total maximum speed, the maximum difference value and the maximum speed deviation.

2. The method for judging the columnar state of the dead charge by utilizing the descending speed of the charging material as claimed in claim 1, wherein the method comprises the following steps: further comprising the steps of:

uniformly and respectively carrying out 3 intervals on all batches according to the blanking time sequence: a first interval, a second interval and a third interval;

respectively calculating the average value of the maximum blanking speeds of all batches in the 3 intervals as a first maximum speed average value, a second maximum speed average value and a third maximum speed average value;

and judging the overall blanking speed variation trend according to the first maximum speed average value, the second maximum speed average value and the third maximum speed average value.

3. The method for judging the columnar state of the dead charge by utilizing the descending speed of the charging material as claimed in claim 2, wherein: further comprising the steps of:

and generating blast furnace adjustment measures according to the dead stock column state and the overall blanking speed variation trend.

4. The method for judging the columnar state of the dead charge by utilizing the descending speed of the charging material as claimed in claim 1, wherein the method comprises the following steps: and evaluating the blanking speed of the dead material column according to the parameter interval where the total maximum speed is located.

5. The method for judging the columnar state of the dead charge by utilizing the descending speed of the charging material as claimed in claim 1, wherein the method comprises the following steps: and evaluating the updating state of the dead stock column and the central state of the blast furnace according to the parameter interval where the maximum difference value is located.

6. The method for judging the columnar state of the dead charge by utilizing the descending speed of the charging material as claimed in claim 1, wherein the method comprises the following steps: and evaluating the updating speed of the dead material column according to the parameter interval where the maximum speed deviation is located.

7. The method for judging the columnar state of the dead charge by utilizing the descending speed of the charging material as claimed in claim 2, wherein: and evaluating the variation trend of the blanking speed according to the size relationship among the first maximum speed average value, the second maximum speed average value and the third maximum speed average value.

8. The method for judging the columnar state of the dead charge by utilizing the descending speed of the charging material as claimed in claim 2, wherein: and judging the states of the dead stock column flag bits according to the size relations among the parameter interval of the maximum speed, the parameter interval of the maximum difference, the parameter interval of the maximum speed deviation, the first maximum speed average value, the second maximum speed average value and the third maximum speed average value, and generating a judgment result of the dead stock column state according to the states of the dead stock column flag bits.

9. The method for determining the columnar state of the dead charge by utilizing the descending speed of the charging material as claimed in claim 8, wherein: and generating corresponding blast furnace adjustment measures according to the state of the dead charge column flag bit.

Technical Field

The invention belongs to the technical field of blast furnace state monitoring, and particularly relates to a method for judging a dead charge column state by using a furnace burden descending speed.

Background

The dead charge column refers to an area where the accumulation in the hearth formed during the operation of the blast furnace is updated slowly and has an important influence on the state of the blast furnace. The area is located in a central area of the blast furnace, a high-temperature convolution area is arranged around the blast furnace, the temperature is up to more than 2000 ℃, hot air reacts with coke in front of a tuyere after entering the tuyere to generate high-temperature coal gas comprising CO, CO2, H2 and N2, the coal gas rises, the coke on the upper part of the convolution area can be continuously consumed by O2, but the coke in the center of the blast furnace can only be gradually consumed by the rotation and friction of the convolution area, for the blast furnace with the coke being added in the center, the top of a dead stock column can extend to the position of a charge level on the upper part of the blast furnace, and the change state of the dead stock column can be reflected by the information of the width of an ore-free area in the center of the charge level of the blast furnace top, the descending speed of furnace burden, the blowing kinetic energy and the like.

Currently, dead charge adjustment is generally evaluated indirectly by means of some monitoring information. Document 1, "mahong repairing, zhangjian, jack new, permanent cure, king one jack, zheng pun super, exploration of erosion characteristics and erosion causes of a blast furnace hearth, steel, 9 months in 2018, vol.53, No.9, p 14-19", based on field data of a No. 1 blast furnace and a No.3 blast furnace of jingtang, the residual thickness of carbon bricks on the side wall of the hearth and the floating height of a dead charge column are calculated by establishing a model, and the result shows that the physical state and the floating state of the dead charge column change along with the change of production parameters and the state of the blast furnace, and the quality and the granularity of coke are ensured according to the actual production condition; the higher the strength of the coke after reaction, the higher the strength of the coke falling into the hearth correspondingly, the higher the porosity of the dead material column and the lighter the molten iron circulation. When the temperature of the furnace bottom is continuously reduced, remedial measures are taken for the blast furnace from various aspects such as upper and lower regulation, and the like, so that the activity of the furnace hearth is improved; the root position of the dead material column is changed, so that the root of the dead material column is far away from the erosion position, the erosion of the carbon bricks in the elephant foot area is reduced, and the long service life of the blast furnace is ensured. The document does not provide means and measures for on-line evaluation of the coke consumption state of the dead material column of the hearth.

In document 2, "xuwanren, zhanyongfaithful, characterization and improvement approach of activity state of blast furnace hearth", iron making, 6 months 2010, vol.29, No.3, P23-26 "uses dead charge column pressure difference H and dead charge column slag temperature intensity Q to establish index L for characterizing liquid permeability and activity of hearth, L can be calculated by tuyere sampling data, tuyere sampling can only be performed when blast furnace is shut down, and the index has great limitation in use process.

Document 3 "Tang Shuang Bing, Tai Tong 4350m3 blast furnace core temperature stabilizing production practice, steel, 2011 4 months, Vol.46, No.4, P19-24", by Tai Tong 4350m3 blast furnace in the production process of more than 3 years, the height fluctuation of the core temperature many times, it is concluded that the core dead charge column temperature has certain influence on the working state of the hearth, the side wall temperature of the hearth, the capacity of the blast furnace for receiving strengthening smelting and the like, and it is suggested to realize effective control of the core dead charge column temperature from several aspects of coke quality, gas flow, core dead charge column temperature, blast furnace capacity, slag iron component and the like.

Document 4, "bunbin, horse steel a # blast furnace condition malfunction reason analysis, proceedings of the institute of metallurgical technology and technology, 4 months in 2017, vol.27, No.2, P22-24", judges that the increase of the dead charge column is the cause of the furnace condition malfunction by analyzing the temperature trend of the dead charge column of the furnace core, and then searches the main cause of the furnace condition malfunction by analyzing the symptoms. The document judges the state of the dead material column through the temperature of the dead material column of the furnace core, only pays attention to temperature information, and cannot reflect information such as the structure, consumption, update and the like of the dead material column.

In document 5, "li chun liang, liang chen, measures of activating a hearth of a high furnace with a horse steel 4000m3, iron making, 12 months in 2017, vol.36, No.6, P51-54" analyzes main factors influencing working conditions of the hearth, considers that the activated hearth needs to continuously improve the quality of coke, improve the granularity and carbon content of the coke in a dead stock column region, increase of the content of (Al2O3) in slag can increase the difficulty of permeation of iron slag through coke gaps, is not beneficial to activating the hearth, and greatly improves indexes of the high furnace by adjusting measures such as upper material preparation, ensuring the furnace temperature to be sufficient, controlling proper blast kinetic energy, optimizing operation in front of the furnace and the like. This document proposes a statistically significant measure and lacks an evaluation of the current state of the blast furnace.

As shown in documents 1 to 5, the 5 documents accurately identify several influence factors of the dead stock, such as gas flow in a raceway, coke quality, furnace temperature control, iron slag emission, and the like, and document 1 does not provide means and measures for online evaluation of coke consumption state of the dead stock in a hearth. Document 2 proposes a dead charge column state index L, which has a great limitation in the use process and can be calculated only by sampling from a tuyere when a blast furnace is shut down. Documents 3 and 5 propose that the temperature of the dead column of the furnace core is effectively controlled from the aspects of coke quality, coal gas flow, the temperature of the dead column of the furnace core, blast furnace capacity, slag iron components and the like, and the state of the dead column of the furnace core is improved by means of measures such as adjusting upper material preparation, ensuring abundant furnace temperature, controlling proper blast kinetic energy, optimizing stokehold operation and the like, which are measures in statistical significance and lack of evaluation means for the current state of the blast furnace. Document 4 judges the dead charge column state by the dead charge column temperature of the furnace core, only concerns the temperature information, and cannot reflect the information of the dead charge column structure, consumption, update, and the like.

Disclosure of Invention

The invention aims to solve the defects in the prior art, and provides a method for judging the dead charge column state by using the descending speed of furnace burden, which estimates the blanking speed by using the data measured by scanning radar and realizes the evaluation of the consumption state of the dead charge column of a blast furnace.

The technical scheme adopted by the invention is as follows: a method for judging a dead charge column state by using a furnace burden descending speed comprises the following steps:

acquiring the middle flame area after the material distribution of each batch in real time through radar equipment;

obtaining the blanking speed of each batch in real time through radar equipment;

respectively acquiring the number of data points which are arranged in the flame area of each batch and cover the lightning equipment, and acquiring the blanking speed of each data point covered by the flame area, which is detected by the radar equipment;

calculating the average value, the maximum speed value, the minimum speed value and the difference value between the maximum speed and the minimum speed of the blanking speed corresponding to all data points covered by the flame area in each batch to serve as the difference value of the average speed, the maximum speed, the minimum speed and the blanking speed of the corresponding batch;

calculating the average value of the average speeds of all batches of blanking as a total average speed;

acquiring the maximum value of the maximum blanking speeds of all batches as the total maximum speed;

acquiring the minimum value of the minimum blanking speeds of all batches as a total minimum speed;

obtaining the maximum value of the blanking speed difference values of all batches as the maximum difference value;

calculating the maximum speed deviation of the flame area;

and judging the state of the dead material column according to the total maximum speed, the maximum difference value and the maximum speed deviation.

In the above technical solution, the method further comprises the following steps:

uniformly and respectively carrying out 3 intervals on all batches according to the blanking time sequence: a first interval, a second interval and a third interval;

respectively calculating the average value of the maximum blanking speeds of all batches in the 3 intervals as a first maximum speed average value, a second maximum speed average value and a third maximum speed average value;

and judging the overall blanking speed variation trend according to the first maximum speed average value, the second maximum speed average value and the third maximum speed average value.

In the above technical solution, the method further comprises the following steps:

and generating blast furnace adjustment measures according to the dead stock column state and the overall blanking speed variation trend.

According to the technical scheme, the blanking speed of the dead material column is evaluated according to the parameter interval where the total maximum speed is located.

In the technical scheme, the updating state of the dead stock column and the central state of the blast furnace are evaluated according to the parameter interval where the maximum difference value is located.

In the technical scheme, the updating speed of the dead material column is evaluated according to the parameter interval where the maximum speed deviation is located.

In the technical scheme, the blanking speed variation trend is evaluated according to the size relationship among the first maximum speed average value, the second maximum speed average value and the third maximum speed average value.

In the above technical scheme, the states of the plurality of dead charge column flag bits are respectively judged according to the size relationship among the parameter interval of the maximum speed, the parameter interval of the maximum difference, the parameter interval of the maximum speed deviation, the first maximum speed average value, the second maximum speed average value and the third maximum speed average value, and the judgment result of the dead charge column state is generated according to the states of the dead charge column flag bits.

In the technical scheme, corresponding blast furnace adjustment measures are generated according to the state of the dead charge column flag bit.

The invention has the beneficial effects that: the invention utilizes the furnace top infrared image to determine the range of the flame area, and detects and obtains the measured blanking speed of the scanning radar in real time and stores the blanking speed in the database, thereby being convenient for calling when evaluating the state of a dead material library. And secondly, by utilizing the blanking speed distribution of each data point measured by the scanning radar, the consumption speed of the dead charge column is dynamically evaluated in real time under the normal furnace condition, the working condition of the dead charge column can be effectively evaluated, and real-time and quantitative indexes are provided for controlling the stability of the state of the blast furnace hearth.

Drawings

FIG. 1 is a schematic diagram of the structure and flow of the present invention.

Detailed Description

The invention will be further described in detail with reference to the following drawings and specific examples, which are not intended to limit the invention, but are for clear understanding.

As shown in FIG. 1, the present invention provides a method for determining a dead charge column state by using a burden descending speed. The invention is 3200m³The blast furnace is taken as an example to provide an implementation case.

A 3200m3 blast furnace, the radius of the circumference of the furnace top is 4.5m, and the distribution matrix is 85 tons of ore batch, 16 tons of coke batch and 1.3 meters of material line, wherein an infrared image monitoring system and a scanning radar system are arranged at the top of the furnace, and a blast furnace enables the furnace to be usedThe data is saved by an Oracle database, the relevant data is recorded in each batch, and the speed data of 20 data points is saved in the radial direction. Stored in a database. The infrared image monitoring system and the scanning radar system positioned on the furnace top scan the central flame area of the charge level to obtain the position and the number of data points positioned in the flame area. The data points are arranged on the charge level, the charge level is changed, the radar waves are scanned to the charge level and reflected back, the specific points on the charge level and the distances between the data points are determined through the recovery of the radar waves, the descending speed of the data points is calculated, the radar is provided with a circuit board, a signal transmitting and receiving device and signal processing software, the received radar signals and the processing results are stored in a computer, and related information and cloth information are linked.

The process of executing the method in this embodiment specifically includes the following steps:

step 1: obtaining the width of the middle non-mining area after distributing, namely the width of the flame area: and obtaining the distribution of the infrared images of the furnace burden after the ore is distributed by simple image processing on the basis of the infrared image of the furnace top before the distribution at each time, thereby obtaining the middle flame width W _ O of the ore.

Step 2: constructing a cloth flame width database: the intermediate ore level flame width W _ O is stored in a database TG _ Dis.

And step 3: obtaining the blanking speed: and calculating the blanking speed Viso of the ore by scanning radar. Wherein, the data point position is measured once before each coke charging, the data point position on the charge level after charging is obtained after the charging, the charge level can descend after a period of time, the data point position on the charge level is measured again before the next charging, the descending speed of each data point of the charge level can be calculated through the charge level change before and after the charging, and the measurement result is stored in a database Dis_OreIn (1). Database Dis_OreThe detected ore blanking speed per data point in each batch is saved.

And 4, step 4: calculating the change of the ore blanking speed: calling database TG _ Dis and database Dis_OreDetermining the number of data points of the ore burden surface speed measured in the interval according to the size of the flame areaAnd the measured blanking speed of each data point, by Num_OrePoints in the table, denoted Vi_{Ore_i}And the blanking speed of the ith data point is shown, wherein i is the number of the data point. The average value of the blanking speeds corresponding to all data points of the flame area of each batch in 15 batches of charging materials is calculated as the average speed Me _ V _ O. The maximum value of the blanking speed corresponding to all the covered data points of the flame area of each batch in 15 batches of charge materials is calculated as the maximum speed Ma _ V _ O. The minimum value of the blanking speed corresponding to all data points covered by the flame area of each batch in 15 batches of charging materials is taken as the minimum speed Mi _ V _ O. The difference between the maximum speed and the minimum speed of the blanking corresponding to all the covered data points of the flame area of each batch of 15 batches of charge materials is used as the maximum minimum difference D _ ai _ O, which is shown in the following table:

the average flame zone velocities Me15_ V _ O in 15 batches, the maximum flame zone velocities Ma15_ V _ O in 15 batches, the minimum flame zone velocities Mi15_ V _ O in 15 batches and the maximum difference D15_ ai _ O in 15 batches were calculated on a per batch basis as shown in the following table.

In the formula:

and 5: counting the change situation of the blanking speed of 15 batches of ores: and calculating the maximum speed deviation Del _ Mav _ O of the flame area, the average value Ma15_ v _ O of the maximum speed of the flame area in 15-11 batches of furnace materials, the average value Ma10_ v _ O of the maximum speed of the flame area in 10-6 batches of furnace materials and the average value Ma5_ v _ O of the maximum speed top of the flame area in 5-1 batches of furnace materials. Wherein, the maximum speed deviation of the flame area is calculated by adopting a general formula: deviation refers to the algebraic difference of a certain dimension (real, ultimate, etc.) minus its basic dimension. Dimensional deviation is the algebraic difference between a certain dimension and its basic dimension, called dimensional deviation, or deviation for short. The calculation results are as follows:

step 6: evaluating the blanking speed of the dead material column: and judging the updating condition of the dead material column according to the ore blanking speed characteristics, as shown in the following table.

Me15_ V _ O data for 15 batches of ore were evaluated according to the following criteria, wherein: me15_ VO _ L1 takes a value of 8, Me15_ VO _ L2 takes a value of 10, Me15_ VO _ L3 takes a value of 11.5, Me15_ VO _ L4 takes a value of 13:

the determination result of the present embodiment is that Me15_ V _ O is not less than 10 and not more than 11.5, DeadMan _ F3 is 1, and the blanking of the dead material column is general.

The D _ ai _ O data for 15 batches of ore were evaluated according to the following criteria, wherein: d15_ ai _ O _ L1 takes the value 3, D15_ ai _ O _ L1 takes the value 5, D15_ ai _ O _ L3 takes the value 8, D15_ ai _ O _ L4 takes the value 10:

the determination result of this embodiment is: d15_ ai _ O is more than or equal to 8 and less than or equal to 10, DeadMan _ F9 is 1, and the center of the dead material column is more active.

The Del _ Mav _ C data for 15 batches of ore were evaluated according to the following criteria, in which: del _ Mav _ O _ L1 takes a value of 1.6, Del _ Mav _ O _ L2 takes a value of 1.9:

the determination result of this embodiment is: del _ Mav _ O is less than or equal to 1.6, DeadMan _ F11 is equal to 1, and the updating speed of the dead material column is uniform.

The Ma15_ v _ O, Ma10_ v _ O, Ma5_ v _ O data for 15 batches of ore was evaluated according to the following criteria:

parameter range	Dead material column mark	Description of the invention
			Ma15_v_O≤Ma10_v_O≤Ma5_v_O	DeadMan_F14＝1	The blanking speed is gradually accelerated
Ma15_v_O≥Ma10_v_O≥Ma5_v_O	DeadMan_F15＝1	The blanking speed gradually becomes slower
			Ma15_v_O≤Ma10_v_O≥Ma5_v_O	DeadMan_F16＝1	The blanking speed is fast first and slow second
Ma15_v_O≥Ma10_v_O≤Ma5_v_O	DeadMan_F17＝1	The blanking speed is slow first and fast later

The determination result of this embodiment is: ma15_ v _ O is not more than Ma10_ v _ O is not less than Ma5_ v _ O, DeadMan _ F16 is 1, and the blanking speed is fast first and slow later.

And 7: and (3) carrying out blast furnace regulation aiming at a dead material column state: the blast furnace is pertinently adjusted aiming at the phenomena of slow updating, abnormal updating speed and the like of the dead material column, the heat intensity of coke is ensured, stable blast kinetic energy is kept, the discharge frequency of slag iron is increased, the furnace temperature is stabilized, and the alkalinity of the slag is recommended to be controlled within the range of 1.1-1.15. That is, a corresponding adjustment strategy is generated according to the dead charge column flag with the flag bit of 1, as shown in the following table.

Based on the determination result of the present embodiment, the finally generated adjustment measures are as follows:

those not described in detail in this specification are within the skill of the art.