KR100340571B1 - Behavior Prediction Device and Method for Bell-less Blast Charge - Google Patents

Abstract

The present invention predicts the falling trend of the charges for about 140 charges put into the blast furnace in the charging of the bell-less blast furnace, and quantitatively predicts the dropping position of the charges remaining in the blast furnace and the time of arrival of the charging hole. The present invention relates to a bell-less blast furnace charging predictive device and a method for accurately determining the timing of the operation action caused by the operator's misuse and disturbance factors. Although relying on the sensory judgment based on the operator's experience, the data calculated through the sixth step of the mathematical model of the present invention is systemized to quantify the drop position of the charges, the number of occupancy in the furnace, the prediction of the time of arrival of the charging hole, and the like. By allowing the trader to be recognized, it is easy to track and manage the contents accurately and keep balance. It has many effects on the blast furnace operation due to the increase and decrease of the photosensitive judgment, the prediction of the change of the yellowing, the determination of the rate of charge dropping, the lead at the time of the wrong loading, and the management of the balance of supply and demand of raw materials. The state has advantages.

Description

Behavior Prediction Device and Method for Bell-less Blast Charge

The present invention relates to a behavior prediction device and method of the bell-less blast furnace charging, in particular, in the charging of the bell-less blast furnace predicts the falling trend of the charge of about 140 charges put into the blast furnace Quantitatively predict and display the descent location of charges and the arrival time of the charging charges, so that the behavior of bell-less blast furnace charging can be accurately determined by the operator's misuse and disturbance factors. An apparatus and a method thereof are provided.

In general, a brief description of the method of charging by size of the conventional bell-less blast furnace, the coke (charge), the alternative ore charges, and the small ore charges in total, the first full charge, this full charge The charging process is repeated into the blast furnace, and this charging process is measured by the basis weight process as much as the input amount from the raw material preparation tank to the blast furnace, and then the charging amount is imported into the top loading hopper according to the measured amount and prepared for charging. Recognizing the position from the charge storage device at the position of the fuel and iron ore inside, and repeating the next charging on the basis of 1.0 ~ 1.2M, when the charged amount reaches the charging baseline 12, it is recycled (RECYCLING) 1 It carries about 140 charges a day.

In the charged charge consisting of coke, allele and small ore, the reduction reaction is performed by blowing high temperature hot air (1200 ° C.) through a plurality of circumferences (approximately 34) installed in the circumferential direction at the bottom of the blast furnace. Through the iron ore that is the charge is dissolved through the operator opening the exit port is discharged to the outside of the blast furnace.

In this conventional bell-less blast furnace charging method according to the size, in the process of charging more than 140 charges in the blast furnace due to the abnormalities such as the production process, the transportation process of the raw material to be fed into the blast furnace, the charging process, etc. If less than the desired amount of lead or raw material is added or excessively added, the amount of raw material, ie, COKE, should be compensated for more, and if less ore is added, the amount of molten iron will be less. In the related art, it is difficult to objectively judge an operation in performing an operation such as to compensate the amount as much as possible.

In addition, since there is no quantitative and objective way to directly observe the operation situation inside the blast furnace such as where the charging vehicle index is located in the blast furnace, and when is the discharged to the charter ship. Due to the conditions of the award, it was difficult to predict when certain charges reached the tug-of-war at the time of the tug-of-war and to predictively predict changes in the operation. There was a problem that we had to rely on sensory judgment based on experience.

In addition, as a method of determining which position of a particular charge of the charges charged into the blast furnace has been reached, approximately 140 charge charges per day are determined, and the charges are charged. It is to simply set the time interval between charges that are not considered disturbance factors to 10 minutes and to calculate the estimated charge time per charge number (NO) for 1 day. Therefore, it was only roughly judged whether the charging speed was increasing or slowing down, which is approximately 10 minutes per day, and the number of charges that the iron ore of the raw material was put in the furnace and stayed in the furnace. Doors that rely on rough manual work, with no judgment of variables such as the time of arrival of the tuyere, the location of descent of a particular load, etc. There was a problem.

The present invention has been made to solve the above problems, and therefore, the object of the present invention is to predict the falling trend of the charges for more than 140 charges put into the blast furnace, and then the charges that remain in the blast furnace accordingly The present invention provides a method for predicting the behavior of a bell-less blast furnace charging charge and a method for quantitatively predicting and displaying the water descent position and the charging bulb arrival time.

Another object of the present invention is to accurately determine the timing of the operation action due to misoperation and disturbance factors of the operator, it is possible to accurately determine the timing of the operation action by the misoperation and disturbance factors of the operator to promote the yellowing stability and The present invention provides a bell-less blast furnace charging prediction device and a method for improving productivity by monitoring more effectively.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view of a blast furnace for calculating an effective contents of a charge inside a bell-less blast furnace according to the present invention.

2 is a schematic cross-sectional view of the interior of the blast furnace in which the charge (charge) charged in the interior of the blast furnace is accumulated and dropped.

FIG. 3 is a cross-sectional view of a charging primary charge according to the charging procedure of FIG. 2.

Figure 4 is a block diagram of the behavior prediction device of the bell-less blast furnace charging according to the present invention.

FIG. 5 is a screen display state displayed on the screen display device of FIG. 4, FIG. 5A is a view showing an entire drop position of a charge for a 1/110 blast furnace reduction model according to the present invention, and FIG. 5B is a view of FIG. 4 is an implementation data table through the method for predicting the furnace loading ore position of FIG. 4, and FIG. 5C is a table showing the number of wind charge reaching charges and the number of charges in the furnace stay charged according to the present invention.

Figure 6 is a flow chart showing a behavior prediction method of the bell-less blast furnace charging charge according to the present invention.

* Description of the symbols for the main parts of the drawings *

9: softening fusion zone 10: blast furnace

10-1: molten iron layer 10-2: slag layer

11: wind mouth 12: charging baseline

13: SOUNDING 13-1: weight

16 tap tap 20 opposing sintered ore layer

21 coke layer 22 sintered ore layer

25: center coke 26: 1 charge of the charge

30: charge drop direction line 50: charge event generating unit

51: low level computer ECC: electrical signal communication controller

ICC: Instrument Computer 52: HOST COMPUTER

53: process computer 54: display output device

55: LOGGING PRINTER

As a technical means for achieving the above object of the present invention, the device of the present invention is a bell-less blast furnace charging prediction device including a charge tracking device installed on top of the blast furnace to measure the charge level A charge event generation unit for providing operation data including a basis weight data of the charge event occurrence point data and the charges, and blast furnace data, data of the lead and raw materials to the lower level computer; A lower level computer which transmits various data from the charge event generating unit to the process computer, and converts the charge level detection signal from the charge tracking device 13 into digital data and transmits the digital data to the process computer; A host computer transferring charge lead and property data of raw materials to the process computer during the sintering process (before the blast furnace process); The operation is performed from the time of occurrence of the EVENT transmitted from the lower level computer, and according to the behavior prediction method for the blast furnace charging preloaded, the total volume inside the blast furnace, the reference effective contents, and the respective charging charges. After calculating the volume, the length of each charge in the contents of the standard effective contents, and the time to reach the tuyere at the time of charging, respectively, in sequence, the reduced position of the total charge of the contents of the charge is displayed on the reduced blast furnace model. A process computer for controlling to display the blast furnace loading ore position prediction data, the wind ball reaching charge index and the in-furnace holding charge number; A screen output device for outputting data predicting the behavior of the blast furnace charging under the control of the process computer; Characterized in having a.

In addition, as another technical means for achieving the object of the present invention, the method of the present invention is a method for predicting the behavior of the bell-less blast furnace charging charge, the pre-set from the charging baseline of the upper part of the blast furnace to the top of the blast furnace blast furnace A first step of obtaining the total volume inside the blast furnace by volume for each section; A second step of obtaining a reference effective contents for the contents of the blast furnace except for the space of the range measured by the contents tracking device in the total volume; A third step of obtaining a volume for each charging charge that can exist in the reference effective contents in the blast furnace; The length of the standard effective contents according to the volume of each charging charge is calculated, and the positions of the charges are divided by the intervals of the corresponding charging lengths from the charging baseline with respect to the charging charge number, and Calculating a length of each charge; Calculating the average descent time of the last three charges quantitatively with respect to the ore charged in the upper part of the blast furnace, and calculating the time to reach the top of the semi-molten state when the most recent charge of the charge is charged Step 5; Through the first to fifth steps, the charge number of the charges remaining in the blast furnace, the charge drop position for each charge, and the time prediction to the blowhole are respectively calculated, and then the charge charge of the blast furnace reduction model is calculated. A sixth step of finally displaying, on a screen output device, prediction data such as total descending position, implementation data through the method of predicting the loading ore position, data showing the number of windfall arrival charges and the occupancy charge in the furnace; Characterized in that made.

Hereinafter, a behavior prediction apparatus for a bell-less blast furnace charging charge according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view of a blast furnace for calculating a load effective content inside a bell-less blast furnace according to the present invention, and FIG. 1 illustrates a load effective contents (RVV) inside the blast furnace to be described below. 10) is a diagram for dividing the inside from the charging reference line 12 shown in the upper part to the tuyere 11, and also in the upper predetermined portion of the blast furnace 10 of Figure 1 is equipped with a charge tracking device (13). .

FIG. 2 is a schematic cross-sectional view of the inside of a blast furnace in which charges charged in the blast furnace are piled up and dropped, and FIG. 3 is a cross-sectional view of a charge based on the charging sequence of FIG. 2. 4 is a block diagram of a behavior prediction device for a bell-less blast furnace charging charging according to the present invention.

1 to 4, the bell-less blast furnace charging prediction device according to the present invention is installed on the blast furnace 10, the charge tracking device 13 for measuring the charge level and generation of the charge event The charge event generator 50 provides the low-level computer 15 with operation data including the basis weight data for the viewpoint data and the charges, the blast data, the lead and the raw materials, and the charge event generator ( A low-level computer 15 for transferring various data from 50) to the process computer, converting the charge level detection signal from the charge tracking device 13 into digital data, and transmitting the digital data to the process computer; From the time of charge event (EVENT) transmitted from the host computer 52 which transfers the charge lead of the process (the previous process of the blast furnace process), and the property data of the raw material to the process computer, and the lower level computer 15. According to the behavior prediction method for the blast furnace charging charged in advance, the total volume inside the blast furnace (VVV), the reference effective content (RVV), the volume of each charging (CV), and the reference effective charge After calculating each charge length (CL) and the arrival time (RT) to the tuyere at charge loading in sequence, display the drop position of the total charge of the charge in the reduced blast furnace model. At the same time as controlling, the process computer 53 for controlling the display of the blast furnace loading ore position prediction data, the number of wind charge arrival charges and the number of charges in the furnace stay, and the process computer 53 And a screen output device 54 for outputting the predicted data of the blast furnace charging according to the control.

The lower level computer 15 is an electric signal communication controller (ECC) for transmitting basis weight data through the basis weight process from the charge event generator 50 to the process computer 53, and the charge event generator 50. The operation data including the blast furnace data, the lead and the raw material data from) is transmitted to the process computer 53, and the charge level detection signal from the charge tracking device 13 is converted into digital data. Instrumentation computer (ICC), which transmits the data to the process computer 53.

The screen output device 54 is a device capable of outputting an image such as a CRT, and the behavior prediction device of the bell-less blast furnace charging charge can also print contents output to the screen output device 54. It further includes a logging printer.

FIG. 5 is a screen display state displayed on the screen display device of FIG. 4, FIG. 5A is a view showing an entire drop position of a charge for a 1/110 blast furnace reduction model according to the present invention, and FIG. 5B is a view of FIG. 4 is an implementation data table through the method for predicting the furnace loading ore position of FIG. 4, and FIG. 5C is a table showing the number of wind charge reaching charges and the number of charges in the furnace stay charged according to the present invention. And, Figure 6 is a flow chart showing a behavior prediction method of the bell-less blast furnace charging charge according to the present invention.

Operation according to the present invention configured as described above will be described in detail below based on the accompanying drawings.

Referring to FIG. 1 to FIG. 6, first, referring to FIG. 1, in FIG. 1, the inside of the blast furnace 10 is described in FIG. To each of the charging reference line 12 shown in the upper part from the tuyere 11, and also the charge tracking device 13 installed in the upper predetermined portion of the blast furnace 10 of Figure 1 is charged in the blast furnace 10. The charge level for the charged item is detected and provided to the lower level computer 15.

Referring to FIG. 2, after the charging charge is charged from the softening fusion zone 9 to the charging baseline 12 in the blast furnace 10, the charging charge is transferred to the molten iron by the combustion reaction in the softening fusion zone 9. As it is generated, it is a cross-sectional view showing that the charging charge is lowered downward.

Referring to FIG. 3, a diagram for describing a charge charged into the blast furnace 10 is referred to as a primary raw material for each one raw material layer. Charge, a small ore primary charge is repeatedly charged into the blast furnace 10, wherein the coke (1), coarse (1) alternative ore, 1 small ore combined charge. This entire charge is repeatedly charged into the blast furnace 10, and this charging process is measured through a basis weight process as much as the input amount from the raw material preparation tank to the blast furnace, and then the charging amount is imported into the top loading hopper according to the measured amount. After preparing for charging, the charging position is recognized by the charge storage device 13 at the position where fuel and iron ore in the blast furnace exist, and the next charging is repeatedly performed based on 1.0 ~ 1.2M. When it is reached, it is recycled (RECYCLING) and performs charging about 140 times a day.

In the charged charge consisting of the coke and alleles and small ore, the reduction reaction by blowing a high temperature hot air (1200 ℃) through a plurality of circumference (approximately 34) installed in the circumferential direction at the bottom of the blast furnace ( Or the combustion reaction), the iron ore as the charge is dissolved and the molten iron produced by the operator opening the exit port is discharged to the outside of the blast furnace.

In such a blast furnace process, the operation of the device according to the present invention with respect to the behavior prediction of the bell-less blast furnace charging according to the present invention is described in the first step for the charge charging behavior prediction performed by the process computer. The sixth step will be described in detail below.

First, referring to FIG. 4, the charge event generating unit 50 subtracts the basis weight data through the basis weight process and the operation data including data about blast furnace data, lead, and raw materials including a radius γ of the upper part of the blast furnace. The instrumentation computer (ICC) of the lower level computer 15 transmits the operation data from the charge event generation unit 50 to the process computer 53, and at the same time, the charge tracking device. The charging signal from (13) is converted into digital data and then transferred to the process computer 53. In addition, the electrical signal communication controller (ECC) of the lower level computer 15 transmits the basis weight data from the charge event generating unit 50 to the process computer 53.

The host computer 52 then transfers the charge lead of the sintering process (pre-process of the blast furnace process) and the property data (particle size; -10 mm, Sl, RDI, W-DI) of the raw material to the process computer 53. do.

The process computer 53 refers to data received from the lower-level computer 15 and the host computer 52, predicts the charging charge behavior as follows according to a pre-built program, and predicts the result of FIG. 5. The screen is displayed as shown in. Accordingly, the manipulator was to be compared in the case of abnormal signs of blast furnace blasting, mainly based on the lead, raw materials charged from the screen output device (54).

The process computer 53 calculates the average descent speed of the closest three charges from the time of transmission of the charged event and calculates the volume from the lower level computer 51 to the collected level position. The remaining reference effective content (RVV) minus the volume is calculated, and the length CL of each charge charge is calculated based on the weight of lead and raw materials on which charging is collected from the lower level computer 51. .

In particular, the process computer 53 stores a total of 40 charge event occurrence points and volume calculations per charge, and determines the number of charges in the blast furnace staying through the sum of charged charge volumes that can enter the standard effective contents. Shown in the diagram as shown.

In addition, the charging time of the charging charges 11 is calculated by calculating the average charge drop rate of the previously charged three charges, and the descending position is calculated by calculating the length in the furnace directly under the furnace by the volume of each charged number. By using the display output device 54 as shown in Fig. 5A to display the reduced blast furnace model, as shown in Fig. 5B, each data can be displayed in the form of a table so that the operator can determine an abnormal symptom of the yellowing. It becomes possible.

Referring to FIG. 6, in the first step 61, in order to recognize the lowered position of the charging ore charge in the blast furnace, the timing of the action of the heating and the heating during operation are determined in the event of the charging charge charged in the blast furnace. In order to predict the exact location of the charge in the furnace, the number of stays in the furnace, and to estimate the flight time to reach the tufts of the charge charged from the top of the blast furnace, as shown in FIG. Therefore, the exact total volume (VVV) of each section (15-1 to 15-5) from the charging baseline 12 of the upper part of the blast furnace to the upper part of the tuyere 11 of the lower part of the blast furnace (where the ore is located in an anti-melt state) This is obtained by using Equation 1 below, wherein 15-1 to 15-5 are sections corresponding to the charge effective volumes V1 to V5.

VVV (total volume of the blast furnace) = (V1 + V2 + V3 + V4 + V5) ≒ (3225m ³ )

In the second step 62, the charge tracking device is loaded at the charging reference line 12 (the top surface of the charge inside the furnace), which serves as a reference for the charging charge for charging into the furnace from the above-mentioned working volum. 13) The volume of the charging unit measuring space part up to 13) is changed from time to time according to the charging characteristics, so that it is obtained for each condition, and the contents of the furnace contents except for the space in the range measured by the charge tracking device 13 in the total volume (VVV) are valid. EP to find the product (RVV), which uses the following equations (2a, 2b and 2c).

Equation 2a corresponds to a condition where the current charging baseline is 1.56M or less.

RVV = VVV- (πγ ² SL)

Where -γ; radius of blast furnace top (4.8M)

-SL; stock level measured by sounging

Equation 2b below corresponds to a condition where the current charging baseline is 1.57 to 19.2M.

RVV = VVV-V1- (πγ ² HX)

Where V1: blast furnace upper volume

γ: Radius of the blast furnace (4.8M) xX

(Radius (12) for portions above radius 4.8M at "V1" if the current charging baseline exceeds 1,57)

HX: Depth (12) directly from "A"

In the third step 63, in order to calculate the number of charge charges that may exist in the blast furnace load standard effective content (RVV), the volume of each charge charge is calculated and accumulated until the standard effective content (RVV) is departed. In this case, the volume CV of each charge charged in the furnace where the accumulated number stays in the furnace is calculated by the following equation.

Where CV is the Charge Volume.

CB: Coke Total Base

CG: Coke Gravity

OB: Ore Total Base

SR: Sinter Ratio of Iron Ore

SG: Sinter Gravity

OG: Ore Gravity

100-SR: ORE accounts for iron ore

Next, in the fourth step 64, in order to determine the drop position of the charge of the charge, the range of the reference effective content according to the volume of each charge is different, so that the length of the reference effective charge according to the volume of each charge is the content. The reference effective charge contents (RVV) for determining the falling position of the charges by calculating the position and distinguishing the positions of the charges at intervals corresponding to the corresponding charge length from the charge reference line 12 with respect to the charged charge number 31. The length CL of each charge is calculated by Equation 4 below.

Where CL = length of each charge (M)

BFL: Distance from the top of blast furnace to Punggu (26.27M)

SL: Stock level (m)

CV: Each charge volume (m3)

In the fifth step 65, the time when the charge of the ore charged in the upper part of the blast furnace reaches the tuyere 11 (wind blowing place), which is the lower end of the blast furnace, is quantitatively calculated by the following equation (5). When the charge T1 of the charges shown in Fig. 2 is charged, the time RT to reach the upper part of the tuyere 11 in the semi-melt state is calculated by the following equation (6).

Where T is the average rate of descent of the last three charges relative to the current point

T1, T2, T3: last 3 charges

Where T is the average speed of the last 3 charges

BFL: Distance from the top of blast furnace to Punggu (26.27M)

SL: Charging baseline (m)

CL: Length of each charge (M)

In the sixth step 66, through the first step 61 through the fifth step 65, the number of charges remaining in the blast furnace, the charge drop position for each charge, and the time prediction to the balloon line After each calculation, for the blast furnace reduction model, the prediction data such as the total drop position of the charge occupancy, the execution data through the prediction method of the furnace loading ore position, and the data showing the wind-charge reaching charge index and the in-furnace charge occupancy charge are obtained. As shown in 5A, 5B, and 5C, the final display is performed by the screen output device 54.

According to the present invention as described above, the determined result of the drop position, the number of charges remaining in the furnace and the time of arrival of the tuyere arrival time of the charge charge can be displayed in the blast furnace reduction model as shown in Figure 5A There is a special effect of identifying and predicting the changes in the yellowing depending on the descent location and the load characteristics.

In addition, although the present invention relies on the sensory judgment based on the operator's experience because it is impossible to accurately manage the charges in the prior art, the position of the drop of the charges is determined through the systemization of the data calculated through the sixth step of the mathematical model of the present invention, and the occupancy rate in the furnace is maintained. By quantifying the number of charging and charging time forecasts for charging outlets, the operator can be recognized to facilitate the precise progress and tracking of the charges, the increase of the balance for adjustment of the balance and the ease of photosensitive judgment, and the change of yellowing. Prediction, judging load drop rate, lead length at the time of loading, and balance of raw material supply and demand balance (BALANCE) management have many advantages for operators in blast furnace operation.

The above description is only a description of one embodiment of the present invention, the present invention is capable of various changes and modifications within the scope of the configuration.

Claims (3)

In the bell-less blast furnace charging charging device comprising a charge tracking device 13 installed on the blast furnace 10 to measure the charge level, A charge event generating unit 50 for providing the lower level computer 15 with operation data including charge point occurrence time data and basis weight data for charges, blast furnace data, lead, and raw material data; The lower level computer which transmits various data from the charge event generating unit 50 to the process computer, and converts the charge level detection signal from the charge tracking device 13 into digital data and transmits the digital data to the process computer. (15); A host computer 52 which transfers charge lead and property data of raw materials to the process computer during the sintering step (pre-blast furnace step); The operation is performed starting from the occurrence of the charge event (EVENT) transmitted from the lower level computer 15, and according to the behavior prediction method for the blast furnace charging, which is built in advance, the total volume (VVV) of the blast furnace and the contents of mood validity After sequentially calculating the product (RVV), the volume of each charging charge (CV), each charge length (CL) in the reference effective charge contents, and the arrival time (RT) to the windball at the charge charging, respectively, The blast furnace model controls the display to display the descent position for the entire charge of the charge, and also displays the blast furnace charge ore position prediction data, the number of charges to reach the blast furnace and the number of charges to stay in the furnace. A process computer 53 which controls to display; A screen output device (54) for outputting data predicting the behavior of the blast furnace charging charges under the control of the process computer (53); Bell-less blast furnace charging prediction device characterized in that it comprises a. In the behavior prediction method of the bell-less blast furnace charging, The volume of each section 15-1 to 15-5 set in advance from the charging baseline 12 of the upper part of the blast furnace to the upper part of the tuyere 11 of the blast furnace 10 (VVV) A first step 61 of obtaining; A second step (62) of obtaining a reference effective contents (RVV) for the contents of the blast furnace, excluding the space of the range measured by the charge tracking device (13) in the total volume (VVV); A third step (63) of obtaining a volume for each charging charge (CV) that can exist in the reference effective contents (RVV) in the blast furnace; The length of the reference effective content (RVV) according to the volume (CV) of each charging charge is calculated, and the position of the charge at intervals corresponding to the corresponding charging length from the charging reference line 12 for the charging charge number 31. A fourth step (64) of classifying and calculating the length (CL) of each charge in the charge reference effective content (RVV); After the quantitative calculation of the average descent time (T) of the last three charges for the ore charged in the upper part of the blast furnace, when the most recent charge (T1) of the charge is charged in the molten state (11) A fifth step 65 of calculating a time RT reaching the top; Through the first to fifth steps, the charge number of the charges remaining in the blast furnace, the charge drop position for each charge, and the time prediction to the blowhole are respectively calculated, and then the charge charge of the blast furnace reduction model is calculated. The final display of forecasting data such as the overall descent position, implementation data through the method of predicting the loading ore position, data showing the wind-up arrival charge index, and the occupancy charge in the furnace is displayed on the screen output device 54. Six (66); Method for predicting the behavior of the bell-less blast furnace charging characterized in that consisting of. The method of claim 2, wherein the fifth step 65 in the method of predicting the behavior of the bell-less blast furnace charging is to calculate the time (RT) to reach the upper part of the tuyere 11 in a semi-melt state, that is, Where T is the average speed of the last 3 charges BFL: Distance from the top of blast furnace to Punggu (26.27M) SL: Charging baseline (m) CL: Length of each charge (M)) A method for predicting the behavior of a charged bell-less blast furnace characterized in that it is calculated by.