KR20140016635A - Dropping judgment method of charging material into blast furnace - Google Patents

Abstract

The present invention relates to a method for determining a drop of a charging material into a blast furnace. At a pressure detection point which is prepared toward every direction, and which is separated upward from the blast furnace, a pressure value is extracted. The extracted pressure value is used to calculate the root location of a softening fuser, to determine whether the root location of the softening fuser is within an edge tolerance, and then to alert a user. The drop status of a charging material inside the blast furnace is accurately confirmed, in order to predict and determine the faulty drop status, so as to enhance the blast furnace stability and facilitate the productivity and the quality of the molten iron. [Reference numerals] (AA) Start; (BB) End; (S100) Extract pressure data; (S200) Calculate root location; (S301) Root location is normal?; (S302) Report; (S400) Stop blast furnace operation

Description

[0001] DROPPING JUDGMENT METHOD OF CHARGING MATERIAL INTO BLAST FURNACE [0002]

The present invention relates to a method for determining the inclusion of a charge in a blast furnace. More particularly, the present invention relates to a method for determining the inclusion of a blast furnace in a blast furnace.

In general, the blast furnace operation is molten iron or sintered ore charged into the upper part of the blast furnace is melted by the hot air supplied through the tuyere to produce a melt (melting and slag), the melt accumulated in the furnace bottom continuously through the outlet The process is discharged to.

Coke is used as a heat source in blast furnace operation. Coke is a raw material used as a heat source of the blast furnace and also serves as a reducing agent for reducing iron ore.

The blast furnace operation is to charge the coke and iron ore or sintered ore as described above, and to supply the hot air to the bottom of the blast furnace to manufacture molten iron.

The present invention and related prior art are disclosed in Korean Patent Laid-Open No. 10-2012-0023057 (March 12, 2012, blast furnace operation method).

An object of the present invention is to provide a method for determining the inclusion of a blast furnace in a blast furnace, which can accurately predict a falling state of blast furnace charge and predict an overflow drop.

A pressure value extracting step of extracting a pressure value measured at a pressure measuring point provided for each circumferential direction of the furnace body at each pressure detection height point with a pressure detection height point spaced apart in the height direction of the furnace body;

A root position calculation step of calculating a root position of the softened welded part through the pressure value extracted in the pressure value extraction step;

And a notification step of determining whether the position of the root of the softened welded joint calculated in the root position calculation step is in the normal range and notifying that the position of the root of the softened welded joint is in the normal range.

The present invention has the effect of accurately confirming the falling state of the charge in the blast furnace, predicting and determining the dropout state during the blast furnace operation, improving the stability of the blast furnace operation, and facilitating the management of the quality and yield of the molten iron.

The present invention has the effect of standardizing the operation management and preventing misrepresentation of the operator.

Fig. 1 is a schematic diagram of an indoor situation. Fig.
FIG. 2 is a flowchart showing a method for determining a charge drop of a blast furnace according to the present invention
Fig. 3 is a schematic view of the present invention,
Fig. 4 is a schematic view showing a state in which the in-
5 is a block diagram showing the step of calculating the root position in the present invention
6 is a view showing an example of a table showing exponent values by pressure measurement points in the step of calculating the root position of the present invention
7 to 9 are graphs showing the position of the root of the softened welded joint calculated by the root position calculating step of the present invention

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1, the situation in the furnace body is divided into a mass bar A, a softened welded belt B, a load cell C, a combustion chamber D and a furnace opponent E from above. The shape of the furnace body in the softened welded joint is distributed in the inverse V shape, horizontal shape, W shape, and the like depending on the heat flow rate of the charge and the rising gas in the radial direction and height direction of the furnace body. The indirect reduction and direct reduction of iron ore proceeds in the softened welded zone, and the reduced iron or unreduced iron (FeO) reacts with the slag component to become a semi-molten state, and the cokes form a slit layer therebetween. When the temperature reaches about 1520 ~ 1620K (1247 ~ 1347 ℃), metal iron and slag phase become liquid phase and start to drop. When the soft welded joint is distributed in the reverse V from the upper part to the lower part of the Bosch, the cross-sectional area of the coke slit layer which is very easy to breathe is wide, so the aging can be stabilized and the high exit work can be performed by increasing the blowing amount. On the other hand, when the softened welded joint is distributed downward, the aeration resistance (pressure loss) becomes large, so that an abnormal operation such as a slip phenomenon in which a charge temporarily dips and a hanging phenomenon in which a downward stagnation occurs occur, . As described above, the shape of the soft welded joint greatly affects the air permeability of the hot reducing gas, and as a result, the temperature distribution in the furnace body, the reduction of iron ore, It is important.

Referring to FIG. 2, in the method for determining the charge drop of the blast furnace according to the present invention, there is a pressure detection height point spaced in the height direction of the furnace body, and the pressure measured at a pressure measuring point provided for each circumferential direction of the furnace at each pressure detection height point A pressure value extraction step (S100) for extracting a value;

A root position calculation step (S200) of calculating a root position of the softened welded portion through the pressure value extracted in the pressure value extraction step (S100); And

(S300) of determining whether the root position of the softened welded joint calculated in the root position calculation step (S200) is in the normal range (S301) and notifying the position (S302).

In addition, the present invention is characterized in that when the blast furnace shutdown is confirmed and the operation is not stopped, the operation stop confirmation step (S400) for repeating the pressure value extraction step (S100), the root position calculation step (S200), and the notification step (S300) .

The pressure value extracting step S100 is a step of setting a pressure detection height point spaced apart in the height direction of the furnace body and providing a pressure measurement point for each circumferential direction of the furnace body at each pressure detection height point, do.

3, there is a pressure detection height point spaced in the height direction of the furnace body in the furnace body. In the present invention, the pressure detection height point is set to 1 at the lowest pressure detection height point of the furnace body, Numbered in order, and divided into forty blocks between the lowermost pressure detection end and the uppermost pressure detection end of the blast furnace. The pressure detection height point is spaced apart from the valley portion of the blast furnace to the shaft portion of the blast furnace. When the shaft portion of the blast furnace is divided into nine stages, the height range from the valley portion of the blast furnace to the sixth- 40 pressure detection height points. Referring to FIG. 4, the pressure detection height point has a plurality of pressure measurement points arranged in the circumferential direction, and the pressure measurement point is equipped with a pressure measurement sensor to measure the pressure. The pressure measuring points are provided at intervals of 18 degrees from the center of the furnace body. The pressure value extraction step (S100) is to measure and extract pressure at each pressure measurement point arranged in the circumferential direction at the pressure detection height points from 1 to 41.

That is, the non-body has a total of 820 pressure measurement points in 20 pressure measurement points in the circumferential direction at each of 41 pressure detection height points, and the pressure value extraction step (S100) extracts pressure values measured at the 820 pressure measurement points do.

Table 1 shows the pressure value data measured and measured at the 81 pressure measurement points of the present invention.

As shown in Table 1, the pressure value extraction step S100 measures and extracts pressure values at respective pressure measurement points provided for the circumferential direction of the furnace body at the pressure detection height points spaced apart in the height direction of the furnace body.

Referring to FIG. 4, the root position calculation step S200 calculates a standard deviation of pressure values in the circumferential direction in the predetermined height interval based on the pressure measurement points, calculates a standard deviation of the pressure measurement points in the circumferential direction A standard deviation calculation step (S201) of extracting a value; An average standard deviation calculating step (S202) of obtaining an average value of the standard deviation values extracted in the standard deviation calculating step (S201); (S204) of determining a root confirmation reference value by comparing the average value calculated in the average standard deviation calculation step (S202) with a predetermined reference value; And a root sensing point check step (S204) of comparing the root confirmation reference value with each standard deviation value calculated in the standard deviation calculation step (S201) and confirming the root sensing at each pressure detection height point.

The standard deviation calculation step (S201) calculates a standard deviation value of the pressure values in the circumferential direction in the same height section within a preset height interval based on each pressure measurement point in the pressure value extraction step (S100). Each calculated standard deviation is the standard deviation of each pressure measurement point.

After the standard deviation calculation step S201, an average standard deviation calculation step S202 for obtaining an average value of the standard deviation values is performed. The average standard deviation calculation step (S202) calculates an average value of all standard deviation values within a predetermined range. The predetermined range is preferably a range within a height range in which a root is generally formed in a predetermined range to calculate an average value of standard deviation values.

For example, the standard deviation calculation step (S201) may calculate standard deviations of five pressure measurement points including four pressure measurement points, that is, an upper portion of a reference pressure measurement point in the example of Table 1, The standard deviation is extracted as the corresponding standard deviation value of the reference pressure measurement point.

For example, in Table 1, the standard deviation value for the pressure measurement point of 0 degree at the first pressure detection height point is the standard deviation value for the pressure measurement point of each 0 degree at the pressure detection height point of the first to fifth points.

The standard deviation of each pressure measurement point is calculated from the pressure measurement value data of Table 1 by the above method, i.e., the standard deviation of five pressure measurement points including the corresponding pressure measurement point, The extracted standard deviation values of the measurement points are shown in Table 2 below.

The average standard deviation calculation step (S202) calculates an average value of all standard deviation values within a predetermined range, and the predetermined range is a height at which a root is generally formed in a predetermined range to calculate an average value of standard deviation values Range.

Since the root in the furnace body occurs at the lower portion with respect to the center of the furnace body, the average standard deviation calculation step (S202) calculates an average value of all the standard deviation values of the pressure detection height points located at the lower portion with respect to the furnace body central portion. In addition, since the root portion of the furnace body is located within a height section up to 1/2 of the entire lower portion with respect to the furnace body center, all standard deviation values of the pressure detection height points within the height section up to 1/2 of the lower portion based on the central portion of the furnace body Is calculated.

The average standard deviation calculation step (S202) calculates an average of all the standard deviation values of the pressure measurement point between the eleventh pressure detection height point and the 20th pressure detection height point. That is, the average of all the standard deviation values in each circumferential direction is calculated from the pressure detection height 11 and the pressure detection height 20.

The root confirmation reference value determining step (S204) compares the average standard deviation value with a preset reference value to determine a root reference reference value. In the root confirmation reference value determination step (S204), if the average standard deviation value is greater than a preset reference value, the root confirmation reference value is determined as a first reference value, and if the average standard deviation value is less than a preset reference value, For example, the preset reference value is 45, the first reference value is 40, and the second reference value is 30. The predetermined reference value and the root confirmation reference value are derived from the test data actually experienced in the furnace body in the blast furnace, respectively.

In the root sensing point confirmation step (S204), the standard deviation value of each pressure measurement point is compared with the root confirmation standard value. If the standard deviation value exceeds the root confirmation standard value, the corresponding pressure measurement point is displayed as 1. If the standard deviation value is the root confirmation standard value And a process of indexing the position of the root by the pressure measuring point indicating the pressure measurement point as zero.

Table 3 below shows an example of performing the root position indexing process for each pressure measurement point through the embodiment of Table 2 above.

In another embodiment, the table in which the root position index for each pressure measurement point is calculated is shown as 0 or 1 in the root position index for each pressure measurement point as shown in FIG. 6, and the portion denoted by 1 represents the position where the root is formed.

In the present invention, the root position calculation step (S200) includes a graph display process of displaying a pressure measurement point having a root position index of 1 among the root position indexes per pressure measurement point as a graph. In the graph display process, the space of the pressure measurement point where the root position index X-axis is divided by the pressure measurement height point, the Y-axis is divided by the circumferential angle, each space is the pressure measurement point, and the root position index is 1, Outputs the graph indicated by the root as a monitor.

The graph of the graph display process can be seen in FIGS. 7 to 9. FIG.

Figs. 7 to 9 are graphs showing the case of a blast furnace falling in the blast furnace. The informing step (S300) is to judge whether the root position of the softened welded zone identified in the graph is in the normal range, and notify when it is abnormal.

As described above, in the notification step (S300), when the abnormality detection for the charge drop of the blast furnace is notified, the blast furnace is operated to take the action of the hot wind blowing into the blast furnace or the charging of the coke into the blast furnace, It can be stably maintained in a steady state.

The normal range in which the root of the softened welded joint is formed is, for example, one to the first stage of the shaft when the valley portion and the shaft portion are divided from the first stage to the ninth stage from the bottom.

7 and 9, when the number of squares deviating from the normal range, that is, the number of pressure measurement points is detected to be equal to or greater than a predetermined number, the notification step S300 determines that the charge falls in the blast furnace, It is to be notified as above the charge drop of the blast furnace.

8, when the root of the softened welded joint is divided into two parts, it is determined that the burden of the blast furnace is greater than or equal to the amount of blast furnace charge.

In the present invention, when there is an abnormality in the root position of the softened welded band as described above, it is detected and notified. At this time, it can be confirmed that a drop phenomenon such as a slip phenomenon or a hanging phenomenon occurs at a time difference after the occurrence of an abnormality in the root position of the softened welded joint. Therefore, the present invention is capable of predicting descending anomalous phenomena according to the criteria for the normal range in which the root of the softened welded zone is formed.

The present invention accurately ascertains the charge drop state in the blast furnace, predicts and judges the dropout state during blast furnace operation, improves the stability of the blast furnace operation, and facilitates the management of the quality and yield of the wire. The present invention standardizes the operation management to prevent misrepresentation of the operator.

It will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the present invention.

S100: pressure value extraction step S200:
S300: Notification phase

Claims (7)

A pressure value extracting step of extracting a pressure value measured at a pressure measuring point provided at each pressure detecting height point in the circumferential direction of the furnace body, wherein the pressure detecting height point is spaced apart in the height direction of the furnace body;
A root position calculation step of calculating a root position of the softened welded part through the pressure value extracted in the pressure value extraction step;
And a notification step of determining whether or not the vicinity of the softened fusion zone calculated in the near position calculation is in the normal range. The method according to claim 1,
Wherein the calculating the root position comprises:
A standard deviation calculation step of obtaining a standard deviation of pressure values in the same circumferential direction within a preset height interval based on each pressure measurement point and extracting a standard deviation value of pressure measurement points in the circumferential direction at each pressure measurement point;
An average standard deviation calculating step of obtaining an average value of the standard deviation values extracted in the standard deviation calculating step;
Determining a root confirmation reference value by comparing the average value calculated in the average standard deviation calculation step with a predetermined reference value to determine a root confirmation reference value; And
Comparing the root confirmation reference value with each standard deviation value calculated in the standard deviation calculation step and confirming the root detection at each pressure detection height point. The method according to claim 2,
The root sensing point checking step may include:
The standard deviation value of each pressure measurement point is compared with the root confirmation standard value. If the standard deviation value exceeds the root confirmation standard value, the corresponding pressure measurement point is displayed as 1. If the standard deviation value is below the root confirmation standard value, Wherein the method comprises a step of exposing a location of a root by a pressure measurement point. The method according to claim 3,
Wherein the calculating the root position comprises:
And a graph display step of displaying a pressure measurement point having a root position index of 1 among the root position indexes per pressure measurement point as a graph. The method of claim 4,
The graph display process may include:
The graph of the root position index X-axis is divided by the pressure measurement height point, the Y-axis is divided by the circumferential angle, each column is the pressure measurement point, and the root position index is 1, To the monitor. The method of claim 1, The method according to claim 5,
Wherein the notifying step determines that the charge is lower than a charge drop in the blast when the number of pressure measurement points deviating from a normal range in the graph is greater than a predetermined number, and notifies the blast water drop determination method. The method according to claim 5,
Wherein,
Wherein when the root of the softened welded joint is divided into two pieces, it is determined that the burden of the blast furnace is higher than the blast furnace descent, and the blast furnace is informed of the blast furnace lowering of the blast furnace.

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