JP2011219800A - Target distribution conversion device for blast furnace-charged material, target distribution conversion method for blast furnace-charged material used for the device, and target distribution conversion program for blast furnace-charged material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide: a target distribution conversion device for a blast furnace-charged material that converts a target charged material distribution into a distribution taking actual operation conditions of a blast furnace into consideration when the target charged material distribution is given during operation of the blast furnace; a target distribution conversion method for the blast furnace-charged material used for the device; and a target distribution conversion program for the blast furnace-charged material.SOLUTION: The conversion method is used for converting the charged material distribution as a distribution of layer thickness ratios of an ore layer and a coke layer, stacked alternately at a furnace top part of the blast furnace, at respective positions of a predetermined radius. The conversion method is characterized by acquiring amounts Vo and Vc of charging of ore O and coke C into the blast furnace for each batch, acquiring a target distribution F2(x) as the target charged material distribution during the operation of the blast furnace, and converting the target distribution F2(x) so that a distribution shape of the target distribution F2(x) resembles a distribution shape when the target distribution F2(x) is acquired and matches the respective acquired amounts of charging of the ore O and coke C.

Description

  The present invention provides a target distribution conversion device for a blast furnace charge that converts the charge distribution so as to be consistent with the operating conditions of the blast furnace when a target charge distribution at the top of the blast furnace furnace during operation is set. The present invention relates to a target distribution conversion method for a blast furnace charge and a target distribution conversion program for a blast furnace charge used in this apparatus.

  An important indicator for stable operation of the blast furnace is the charge distribution (layer thickness ratio distribution) at the top of the blast furnace. This charge distribution refers to the ratio of LO / (LO + CO) in the furnace radial direction when the layer thicknesses of the ore layer and the coke layer alternately stacked in the furnace are LO and LC, respectively. This is the distribution state at each position (see FIG. 8).

  This charge distribution is determined by changing the shape (surface profile) of the upper surface of the charge layer using a profile meter that utilizes microwave reflection each time charge such as ore and coke is charged into the furnace. Each layer thickness distribution along the furnace radial direction of the ore layer and the coke layer is obtained directly based on this surface profile, and obtained from these layer thickness distributions.

  As another method, the relationship between the charging conditions and the surface profile is determined from the past performance data, and various charging conditions (for example, armor stroke of the moving arm, the tilt angle of the chute, the charging weight of the charging material, There is known a method using a simulation model that calculates a surface profile under a calculation condition (such as a sounding level), estimates a layer thickness distribution of each layer based on the surface profile, and thereby obtains a charge distribution ( Patent Document 1).

  By operating based on the charge distribution obtained by these methods, stable operation of the blast furnace becomes possible. Specifically, the charge distribution is monitored by the above method in the blast furnace in operation, and when the charge distribution deviates from a distribution suitable for stable operation, the charge distribution is stabilized by the blast furnace. Change the operating conditions so that the distribution is suitable for the

JP 2001-323306 A

  If it is a blast furnace engineer who has knowledge about blast furnace operation, if the distribution shape of the current charge distribution is given, a distribution shape suitable for stable operation of the blast furnace can be assumed by changing a part of the distribution shape. . According to this method, if the current charge distribution in the blast furnace is obtained, a distribution shape (target distribution) that should be a target suitable for stable operation of the blast furnace can be obtained from the distribution shape without performing complicated calculations by a computer or the like. Shape) can be obtained easily and quickly.

  However, the target distribution shape obtained in this way is obtained by paying attention only to the shape, and since the actual operating conditions of the blast furnace are not considered, the distribution shape of the charge distribution of the blast furnace is Even if an operation condition that achieves the target distribution shape is obtained and the blast furnace is operated under this condition, there is a high possibility that the actual blast furnace charge distribution will have a distribution shape different from the target distribution shape.

  Therefore, when a target charge distribution in the operation of the blast furnace is given, a target distribution conversion device for the blast furnace charge that converts this charge distribution into a distribution that takes into account the actual blast furnace operation conditions, It is an object of the present invention to provide a target distribution conversion method and a target distribution conversion program for a blast furnace charge used in this apparatus.

  Therefore, in order to solve the above-mentioned problems, the present invention provides a charge distribution that is a distribution of a layer thickness ratio at each position of a predetermined furnace radius between an ore layer and a coke layer that are alternately stacked at the top of the blast furnace. An apparatus for converting, a charge acquisition means for acquiring each charge per one batch of ore and coke into the blast furnace, and a target distribution that is a target distribution of charges in the operation of the blast furnace. Target distribution acquisition means for acquiring, conversion means for converting the acquired target distribution based on the respective charges of the acquired ore and coke, and output means for outputting the target distribution converted by the conversion means And comprising. Then, the conversion means approximates the shape of the target distribution acquired by the target distribution acquisition means, and has a distribution having a shape that matches the amounts of ore and coke acquired by the charge acquisition means. The target distribution is converted. Also, a method for converting a charge distribution, which is a distribution of a layer thickness ratio at each position of a predetermined furnace radius between an ore layer and a coke layer that are alternately stacked at the top of the blast furnace, A charging amount acquisition step for acquiring each charging amount per batch of ore and coke, a target distribution acquisition step for acquiring a target distribution that is a target distribution of charges in the operation of the blast furnace, and the target distribution Converting the target distribution into a distribution having a shape that approximates the shape of the target distribution acquired in the acquisition step and that matches the amount of ore and coke acquired in the charge acquisition step; It is characterized by providing. In the present invention, the charging unit of ore and coke into the blast furnace is a batch.

  According to such a configuration, even if the target distribution is set by focusing only on the distribution shape of the charge distribution without considering the operating conditions of the blast furnace, the distribution shape of the target distribution is a distribution considering the operating conditions of the blast furnace. The target distribution is adjusted to have a shape. Specifically, in actual blast furnace operation, when changing the operating conditions to change only the charge distribution (distribution shape), ore and coke charging method (if bellless blast furnace, tilting of chute) Note that only the angle and the armature stroke for the Belle Arma blast furnace are changed, and the charging amounts of ore and coke per batch are not changed. In other words, the target distribution is converted so that the distribution shape of the target distribution approximates the distribution shape of the target distribution at the time of acquisition and matches the charging amounts of ore and coke per batch in the blast furnace operation. The This makes it possible to obtain a target distribution that takes into account the operating conditions of the blast furnace, and to determine the operating conditions so that the charge distribution of the blast furnace becomes the target distribution after this conversion, and to operate the blast furnace according to those conditions. Thus, the distribution of the charge in the blast furnace can be made a distribution shape approximating the target distribution.

  The charge distribution in the operating blast furnace is monitored, and when the charge distribution deviates from the predetermined distribution, the operation condition is changed so that the charge distribution returns to the original distribution (predetermined distribution). Thus, it has been conventionally performed to reduce the risk of the state in the furnace becoming unstable by reducing the change in the charge distribution. In the above configuration, by changing only a part of the current charge distribution (distribution shape) of the blast furnace and setting the target distribution, the change in the charge distribution is reduced and the inside of the furnace becomes unstable. To reduce such risks. That is, since the distribution shape of the converted target distribution is approximate to the set distribution shape of the target distribution, it has a shape close to the distribution shape of the current charge distribution, and the current charge distribution is Even if the operating conditions of the blast furnace are changed so as to obtain the target distribution after conversion, the risk of the furnace becoming unstable can be suppressed.

  In the target distribution conversion apparatus for a blast furnace according to the present invention, the conversion means includes each volume per one batch of the ore and the coke based on each charge of ore and coke obtained by the charge acquisition means, When the target distribution before conversion is realized in the blast furnace, it is preferable to convert based on the ore and coke volumes constituting the target distribution.

  Thus, each parameter can be easily obtained by using the volume (charge amount) of the charges (ore and coke) as the parameters necessary for converting the target distribution. Specifically, the ore and coke charging amounts acquired by the charging amount acquisition means are indispensable items in actual blast furnace operation, and thus can be obtained without performing calculations. Further, when the target distribution before conversion is realized in the blast furnace, each volume of ore and coke constituting the target distribution can be obtained by simple calculation from the distribution shape of the target distribution before conversion.

  The conversion means converts the target distribution by multiplying a value of each layer thickness ratio in the target distribution by a predetermined coefficient, and the predetermined coefficient is one of the ore and coke obtained by the charging amount obtaining means. It is preferably defined based on each volume per batch and each volume of ore and coke based on the target distribution before conversion.

  By multiplying the value of each layer thickness ratio in the target distribution by such a predetermined coefficient, a distribution whose distribution shape is proportional (approximate) to the distribution shape of the target distribution is obtained. In addition, the predetermined coefficient can be easily derived by using the volume of the charge obtained easily as a parameter that defines the predetermined coefficient.

  In addition, in order to solve the above-mentioned problems, the present invention provides a charge distribution that is a distribution of a layer thickness ratio at each position of a predetermined furnace radius between an ore layer and a coke layer that are alternately stacked at the top of the blast furnace. A program for converting, receiving a charge distribution per batch of ore and coke into the blast furnace and a target distribution that is a target distribution of charges in the operation of the blast furnace, It is characterized by functioning as means for converting the target distribution into a distribution having a shape that approximates the shape of the received target distribution and matches the amount of each of the received ore and coke.

  By incorporating such a program into the computer, the target distribution set by paying attention only to the distribution shape of the charge distribution without considering the operating conditions of the blast furnace, and each ore and coke per batch of blast furnace When the charging amount is input to the computer, the computer converts the target distribution into a distribution that takes into account the operating conditions of the blast furnace.

  As described above, according to the present invention, when a target charge distribution is given in the operation of the blast furnace, the charge distribution is converted into a distribution taking into consideration the actual operating conditions of the blast furnace. An object target distribution conversion apparatus, a target distribution conversion method used in the apparatus, and a target distribution conversion program for a blast furnace charge can be provided.

It is a block diagram of the target distribution conversion apparatus according to the present embodiment. (A) is a figure for demonstrating the function F (x) showing the distribution shape of a charge distribution, (B) demonstrates the method of calculating | requiring the volume ratio of an ore and coke based on a distribution shape. FIG. It is a figure which shows the distribution shape of the present charge distribution. It is a figure which shows the target distribution set based on the present charge distribution. It is a figure which shows the target distribution after the conversion in a conversion means. It is a figure which shows the flow when converting target distribution in the said target distribution conversion apparatus. (A) is a figure which shows the charge distribution at the time of continuing operation on the operation conditions calculated | required based on the target distribution after conversion with a target distribution converter, (B) is based on the target distribution before conversion. It is a figure which shows the burden distribution at the time of continuing operation on the operation conditions calculated | required. It is a figure for demonstrating a charge distribution.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

  The target distribution conversion device (hereinafter also simply referred to as “conversion device”) for the blast furnace charge is set when the target charge distribution (target distribution) at the top of the operating blast furnace furnace is set. Is converted to match the operating conditions of the blast furnace. In this embodiment, the charge distribution is the ratio of LO / (LO + CO) when the layer thicknesses of the ore layer and the coke layer alternately stacked at the top of the blast furnace are LO and LC, respectively. ) In the radial direction of the furnace (see FIG. 8). The distribution shape is a shape representing the relationship between each position of the furnace radius and the layer thickness ratio at that position.

  Specifically, as illustrated in FIG. 1, the conversion device 10 includes an acquisition unit 11, a computer main body 14 that processes information from the acquisition unit 11, and information processed in the computer main body 14 (a conversion result described later). ) To the outside.

  The acquisition means 11 is for inputting predetermined information by an operator such as a blast furnace engineer and transmitting the information acquired by this input to the computer main body 14. The acquisition means 11 of the present embodiment includes a charge acquisition means 12 for acquiring each charge (volume) per batch of a charge to the blast furnace, specifically, ore O and coke C, and a blast furnace in operation. And target distribution acquisition means 13 for acquiring the target distribution at. The charging amount acquisition means 12 is acquired when the operator inputs each charging amount of ore O and coke C per batch charged in the blast furnace in actual operation, and this is input to the computer main body 14. Send. Further, the target distribution acquisition means 13 acquires the target distribution when the operator inputs it, and transmits it to the computer main body 14. In the present embodiment, the charging amount acquisition unit 12 and the target distribution acquisition unit 13 are configured by a common keyboard. The specific configurations of the charging amount acquisition unit 12 and the target distribution acquisition unit 13 are not limited, and are a keyboard in this embodiment, but may be a touch panel or the like. The charging amount acquisition unit 12 and the target distribution acquisition unit 13 may be configured separately and each may be independently connected to the computer main body 14. Further, the charging amount acquisition unit 12 and the target distribution acquisition unit 13 may be configured to directly acquire each of the above information from a computer or the like used for blast furnace control or the like by wire or wireless.

  The computer main body 14 is a so-called computer capable of processing various types of information. A predetermined program is incorporated in the computer main body 14, and the conversion means 15 is functionally configured by executing the program. This conversion means 15 converts the target distribution based on the operating conditions of the blast furnace acquired by the acquisition means 11. The conversion means 15 of this embodiment converts a target distribution based on each charge of ore O and coke C per batch. Specifically, the converting means 15 approximates the shape of the target distribution (target distribution shape) acquired by the acquiring means 11 and each charge amount of the ore O and coke C per batch acquired by the acquiring means 11. Convert the target distribution to a distribution with a shape that matches Specifically, the conversion means 15 converts the target distribution by multiplying the value of each layer thickness ratio in the target distribution by a predetermined coefficient α. In other words, the conversion means 15 performs conversion such that y = α · f (x) when the charge distribution (target distribution) is expressed as y = f (x). Thereby, a distribution (y = α · f (x)) having a shape proportional to (approximating) the distribution shape of the target distribution (y = f (x)) is obtained.

  Here, the shape of the charge distribution that approximates the shape of the specific charge distribution differs from the absolute value of the layer thickness ratio at each position in the furnace radial direction. It means that the increase / decrease tendency of the value of thickness ratio is common. Further, a predetermined coefficient α (hereinafter simply referred to as “α”) is converted into each volume (specifically, volume ratio) per batch of ore O and coke C acquired by the acquisition unit 11. It is a coefficient defined based on each volume (specifically, volume ratio) of ore O and coke C based on the previous target distribution. Specifically, α is represented by the following formula (1).

  Hereinafter, α will be described in detail. Before that, the volume of the ore O and the coke C based on the distribution shape of the charge distribution and how to obtain the ratio will be described.

  As shown in FIG. 2 (A), the charge distribution y = f (x) is obtained by measuring the layer thickness ratio of N points at a predetermined furnace radius including the furnace center and the furnace wall, and measuring the surface profile in the furnace. It is obtained from the value and interpolated between two adjacent points with a straight line.

And
Vo1: y = f (x), x = 0, x = R, the volume of the passing region of this surface when the surface surrounded by the x axis is rotated about the y axis as the rotation center
Vc1: The surface surrounded by y = f (x), x = 0, x = R, y = 1 is defined as the volume of the passing region of this surface when rotated about the y axis.

と表せる。この式（２）を変形することで

が得られる。この式（３）によれば、Ｖｏ１を与えることによってＶｃ１が求まることがわかる。 Since Vo1 + Vc1 is the volume of the passing region of this surface when the surface surrounded by x = 0, x = R, y = 1 is rotated about the y-axis,

It can be expressed. By transforming this equation (2)

Is obtained. According to this equation (3), it can be seen that Vc1 can be obtained by giving Vo1.

  Vo1 can be obtained as follows.

以下の式（６）に示すように、このＶ_ｉをｉ＝１〜Ｎ−１まで足し合わせるとＶｏ１が求まる。

高炉において、鉱石ＯとコークスＣとの層厚の和（ＬＯ＋ＬＣ）は、炉半径方向において一定とみなすことができる。従って、Ｖｏ１とＶｃ１との比は、高炉に装入される鉱石ＯとコークスＣとの体積比Ｖｏ：Ｖｃと等しい。即ち、

が成り立つ。ここで、Ｖｏは、実際に操業中の高炉へ装入される１バッチあたりの鉱石Ｏの装入量であり、Ｖｃは、実際に操業中の高炉へ装入される１バッチあたりのコークスＣの装入量である。 Since the function f (x) linearly interpolates N points, it can be divided into N-1 sections in the radial direction, and each section is represented by a straight line. The i-th section from the furnace center is a straight line connecting (x _i , y _i ) and (x _{i + 1} , y _{i + 1} ). Passing through this surface when the surface surrounded by y = f _i (x), x axis, x = x _i , x = x _{i + 1} shown in FIG. Assuming that the volume of the region is V _i , f _i (x) and V _i can be obtained as in the following equations (4) and (5).

As shown in the following equation (6), Vo1 is obtained when added together the _{V i} until i = 1~N-1.

In the blast furnace, the sum of the layer thicknesses of ore O and coke C (LO + LC) can be considered constant in the furnace radial direction. Therefore, the ratio between Vo1 and Vc1 is equal to the volume ratio Vo: Vc between ore O and coke C charged in the blast furnace. That is,

Holds. Here, Vo is the amount of ore O charged per batch charged into the actually operating blast furnace, and Vc is the coke C per batch charged into the actually operating blast furnace. The amount of charge.

  Next, α will be described.

  For example, when the distribution shape of the current charge distribution in the blast furnace in operation is the shape as shown in FIG. 3, the operator can use the distribution shape suitable for stable operation based on the previous operation experience. It can be determined that the layer thickness ratio of the portion in the vicinity of the furnace wall (dotted oval) is excessively raised toward the furnace wall. Based on this determination, the operator can set the target distribution shape for maintaining the stable operation of the blast furnace to a shape as shown in FIG. The target distribution shape set at this time is set paying attention only to the shape of the distribution shape. That is, when setting the target distribution shape, the operating conditions of the blast furnace (specifically, the amounts of ore O and coke C charged per batch) are not considered.

  This shape is y = F2 (x), and Vo2 and Vc2 corresponding to Vo1 and Vc1 are obtained in the same manner as described above. Α is defined using Vo2 and Vc2 thus determined and Vo and Vc (the amounts of ore O and coke C charged per batch actually charged into the blast furnace). Thus, α can be easily obtained by using the volumes (charges) Vo, Vc, Vo2, and Vc2 of the charges (ore O and coke C) as parameters that define α. Specifically, the charging amounts Vo and Vc of the ore O and the coke C acquired by the acquiring unit 11 are indispensable items in actual blast furnace operation, and thus can be easily obtained without performing calculations or the like. . When the target distribution F2 (x) before conversion is realized in the blast furnace, the volumes Vo2 and Vc2 of the ore O and coke C constituting the target distribution F2 (x) are the target distribution F2 before conversion. It can be obtained from the distribution shape of (x) (see FIG. 4) by simple calculation (see equations (3) to (6)).

と表す。 Here, the target distribution converted by the conversion means 15 is

It expresses.

ここで、式（３）より、

となり、

が得られる。これにより、変換手段１５により変換された目標分布Ｆ３（ｘ）に基づく１バッチあたりの鉱石ＯとコークスＣとの各装入量（体積比Ｖｏ３：Ｖｃ３）と、実際の高炉に装入される１バッチあたりの鉱石ＯとコークスＣとの各装入量（体積比Ｖｏ：Ｖｃ）との整合が取れていることがわかる。 Vo3 and Vc3 corresponding to the above Vo1 and Vc1 in the new charge distribution (converted target distribution) y = F3 (x) are obtained. Vo3 is α times Vo2 from equation (8).

Here, from equation (3),

And

Is obtained. Thereby, each charging amount (volume ratio Vo3: Vc3) of ore O and coke C per batch based on the target distribution F3 (x) converted by the converting means 15 and the actual blast furnace are charged. It can be seen that there is a match with each charge (volume ratio Vo: Vc) of ore O and coke C per batch.

  The conversion means 15 converts the target distribution F2 (x) set by the operator and input to the acquisition means 11 using such α, and outputs the conversion result (converted target distribution F3 (x)). Output to means 16.

  The output means 16 receives the conversion result output from the computer main body 14 (specifically, the conversion means 15) and outputs it to the outside. Although the output means 16 of this embodiment is comprised by display means, such as a CRT display, a liquid crystal display, and PDP, it is not limited to this, Printing means, such as a printer, Other apparatuses (For example, control of a blast furnace, etc.) The computer may be configured to output to a computer etc. The output unit 16 may be a combination of these.

  In the conversion apparatus 10 configured as described above, the target distribution F2 (x) is converted as described below with reference to FIG.

  First, the current charge distribution in the operating blast furnace is obtained. This current charge distribution may be obtained by directly measuring the surface profile in the blast furnace with a profile meter or the like, or may be obtained by simulation from past results data, charging conditions, or the like.

  The resulting charge distribution is shown in FIG. Based on the distribution shape of the charge distribution F1 (x), the operator is based on the previous operation experience and the like, and the layer in the vicinity of the furnace wall (dotted oval) compared to the distribution shape suitable for stable operation. It can be determined that the thickness ratio is too high toward the furnace wall. And an operator sets the target distribution shape for maintaining the stable operation of a blast furnace based on this judgment. Specifically, as shown in FIG. 4, the operator sets a target distribution F2 (x) having a distribution shape obtained by correcting a part of the obtained distribution shape. Specifically, the operator horizontally corrects a portion that is determined to have an excessively increased layer thickness ratio in the above determination, and sets this as a target distribution F2 (x).

  As described above, the target distribution F2 (x) is set based on the operator's knowledge and the like, so that the target distribution F2 (x) is quickly set without performing a complicated calculation. However, since this target distribution F2 (x) is a distribution set by paying attention only to the distribution shape, the actual blast furnace operating conditions are not considered. Therefore, even if the operation conditions are changed based on the target distribution F2 (x), the actual charge distribution is likely to be different from the target distribution F2 (x). Therefore, the conversion device 10 converts the target distribution F2 (x) into a distribution in which the operation conditions are considered.

  The acquisition unit 11 acquires the target distribution F2 (x) by being input by the operator (step S1A). At this time, by the input by the operator, the acquisition means 11 also acquires the charging amounts Vo and Vc of ore O and coke C per batch in the operating blast furnace (step S1B). This step S1B need not be performed simultaneously with step S1A, and may be performed before or after step S1A.

  The acquisition unit 11 transmits the target distribution F2 (x) and the charging amounts Vo and Vc of the ore O and the coke C to the conversion unit 15 of the computer main body 14.

  Receiving this, the conversion means 15 obtains Vo2 and Vc2 from the target distribution F2 (x) as described above (step S2). The conversion means 15 calculates α from the calculated Vo2 and Vc2 and the charged amounts Vo and Vc of the ore O and coke C acquired from the acquisition means 11 (step S3).

  Then, using the α thus obtained, the conversion means 15 converts the target distribution F2 (x) into F3 (x) (specifically, conversion such that F3 (x) = α · F2 (x)). (Step S4). That is, in the conversion means 15, the target distribution F2 (x) set without considering the operating conditions is multiplied by the value of each layer thickness ratio in the target distribution F2 (x), so that the operating conditions are considered. The distribution F3 (x) is converted. The target distribution F3 (x) after the conversion has a distribution shape as shown in FIG.

  Here, Vo3 and Vc3 are obtained from F3 (x) as described above, and compared with the charges Vo and Vc of ore O and coke C actually charged in the blast furnace, the equation (11) It can be seen that In other words, the target distribution F3 (x) after conversion is consistent with the charging amounts of the ore O and coke C actually charged in the blast furnace, and has a distribution shape that takes into account the operating conditions. Yes.

On the other hand, the ratio Vo2: Vc2 of Vo2 and Vc2 obtained from the target distribution F2 (x) is:
Vo: Vc ≠ Vo2: Vc2
It becomes. Therefore, the target distribution F2 (x) is a distribution shape that is not consistent with the charging amounts of the ore O and the coke C actually charged in the blast furnace, and does not consider the operating conditions. I understand.

  The target distribution F3 (x) after being converted by the conversion means 15 in this way is output to the output means 16 as a conversion result. The output means 16 that has received the conversion result from the conversion means 15 displays it (step S5).

  Thereafter, the operator who viewed the displayed target distribution F3 (x) after conversion obtains the operating conditions such that the distribution shape of the charge distribution of the blast furnace becomes the target distribution F3 (x) after conversion. The operating conditions are changed to the obtained operating conditions. Thereby, the charge distribution of the blast furnace becomes the target distribution F3 (x) after conversion from the charge distribution F1 (x), and the stable operation of the blast furnace is maintained.

  According to the converter 10 as described above, even if the target distribution F2 (x) is set by paying attention only to the distribution shape of the charge distribution without considering the operating conditions of the blast furnace, the target distribution F2 (x ) Is adjusted so that the distribution shape F3 (x) takes into account the operating conditions of the blast furnace. Specifically, in actual blast furnace operation, when changing the operation conditions in order to change only the charge distribution (distribution shape), the charging method of ore O and coke C is usually used (if a bellless blast furnace, a chute Note that only the tilt angle, the armature stroke in the case of the Belarmor blast furnace, is changed, and the charging amounts of ore O and coke C per batch are not changed. That is, the distribution shape of the target distribution F2 (x) approximates the distribution shape of the target distribution F2 (x) at the time of acquisition, and the charging amounts of ore O and coke C per batch in the blast furnace operation The target distribution F2 (x) is converted so as to match. Thereby, the target distribution F3 (x) in which the operating conditions of the blast furnace are taken into consideration can be obtained, and the operating conditions such that the charge distribution of the blast furnace becomes the converted target distribution F3 (x) are obtained. By operating the blast furnace according to the conditions, the blast furnace charge distribution F1 (x) can be made the target distribution F3 (x) after conversion. Since the distribution shape of the target distribution F3 (x) after conversion is approximate to the distribution shape of the target distribution F2 (x) before conversion, the charge distribution obtained in the blast furnace by changing the operation conditions Is approximate to the distribution shape of the target distribution F2 (x). That is, it is possible to obtain a charge distribution that approximates the target distribution shape.

  Further, according to the conventional method, the charge distribution in the operating blast furnace is monitored, and when the charge distribution deviates from the predetermined distribution, the charge distribution is changed to the original distribution (the predetermined distribution). The operating conditions are changed to return to (). Thereby, the change of a charge distribution can be made small and the risk that the state in a furnace becomes unstable can be suppressed. On the other hand, according to the converter 10, only a part of the current charge distribution (distribution shape) F1 (x) of the blast furnace (part near the furnace wall in FIG. 3) is changed to change the target distribution F2 (x ) (See FIG. 4), the change in the charge distribution can be reduced. That is, since the distribution shape of the converted target distribution F3 (x) is approximate to the set distribution shape of the target distribution F2 (x), the shape is close to the distribution shape of the current charge distribution F1 (x). Even if the operating conditions of the blast furnace are changed so that the current charge distribution F1 (x) becomes the target distribution F3 (x) after conversion, there is a risk that the furnace becomes unstable. Can be suppressed.

  In addition, the target distribution conversion apparatus of the blast furnace charge of the present invention, the target distribution conversion method used in this apparatus, and the target distribution conversion program of the blast furnace charge are not limited to the above-described embodiments, but the present invention. Of course, various changes can be made without departing from the scope of the present invention.

  The specific method of setting the target distribution is not limited. For example, in this embodiment, the target distribution F2 (x) is set by changing a part of the distribution shape based on the current charge distribution F1 (x). It may not be set based on the distribution F1 (x). In addition, the target distribution may be set by changing a plurality of locations in the current charge distribution F1 (x).

  In the above embodiment, the blast furnace obtained from the current charge distribution F1 (x) is used as an analysis model, and the charge distribution obtained in the blast furnace when the operation condition is changed to a predetermined operation condition and the operation is continued. Was obtained by simulation (charge simulation).

The specific method for obtaining the operating conditions to be changed in order to obtain the target charge distribution in the blast furnace is obtained by changing the operating conditions (charge conditions) and executing the charge distribution simulation many times. The obtained charge distribution is compared with the converted target distribution F3 (x). By repeating this many times, the changed operating conditions are obtained. That is, this set is made by changing the operating conditions, executing the simulation under the changed operating conditions, and comparing the charge distribution obtained by the simulation with the converted target distribution F3 (x). The operation condition to be changed is set as the operation condition to be changed when it is repeated many times and the charge distribution most similar to the converted target distribution F3 (x) is obtained. Specifically, the layer thickness ratio of the target distribution F3 (x) after conversion at N radial positions shown in FIG. 2A is y _i , and the simulation result of the layer thickness ratio at the radial position is s _i . The difference E between y _i and s _i is expressed by the following equation (12). Then, the operating condition (charging condition) when the value of E becomes the smallest and the distribution of the charged material as the simulation result are obtained.

FIG. 7A shows the charge distribution as a simulation result when the value of E is the smallest.

  On the other hand, using the target distribution F2 (x) before conversion, similarly to the above, the operating condition (charging condition) when the value of E was the smallest and the charging distribution as a simulation result were obtained. FIG. 7B shows the charge distribution as a simulation result when the value of E is the smallest.

  In FIG. 7A, the distribution shape of the charge distribution in the vicinity of the furnace wall (the dotted elliptical portion in FIG. 3) is a flat shape set as a substantially target distribution. On the other hand, in FIG. 7B, a mountain shape having a peak at the position of the arrow in the figure appears. This is considered to be because the distribution shape of the target distribution F2 (x) before conversion is not consistent with the charging amounts of the ore O and the coke C.

  From the above, even if the target distribution F2 (x) is set by paying attention only to the distribution shape of the charge distribution without considering the operating conditions of the blast furnace, the target distribution F2 (x) is taken into consideration of the operating conditions of the blast furnace. By converting to a distribution shape F3 (x), and obtaining operating conditions such that the distribution of the blast furnace charge becomes the target distribution F3 (x) after the conversion, and operating the blast furnace according to the conditions. It was confirmed that the charge distribution F1 (x) of the blast furnace could be the target distribution F3 (x).

DESCRIPTION OF SYMBOLS 10 Target distribution converter 11 Acquisition means 12 Charge amount acquisition means 13 Target distribution acquisition means 15 Conversion means 16 Output means F1 (x) Current charge distribution F2 (x) Target distribution F3 (x) Target distribution after conversion C Coke O ore

Claims (5)

An apparatus for converting a charge distribution, which is a distribution of a layer thickness ratio at each position of a predetermined furnace radius between an ore layer and a coke layer stacked alternately at the top of a blast furnace,
Charge amount acquisition means for acquiring each charge amount per batch of ore and coke into the blast furnace;
Target distribution acquisition means for acquiring a target distribution which is a target charge distribution in the operation of the blast furnace;
Conversion means for converting the acquired target distribution based on the respective charges of the acquired ore and coke;
Output means for outputting the target distribution converted by the conversion means,
The conversion means approximates the shape of the target distribution acquired by the target distribution acquisition means and has a distribution having a shape that matches the ore and coke charging amounts acquired by the charge acquisition means. A target distribution conversion device for a blast furnace charge, characterized by converting the distribution. The target distribution conversion device according to claim 1, wherein
The conversion means comprises ores and coke per batch obtained by the charging amount acquisition means, and ores constituting the target distribution when the target distribution before conversion is realized in the blast furnace. And a target distribution conversion device for a blast furnace charge, wherein conversion is performed based on each volume of coke. The target distribution conversion device according to claim 1, wherein
The converting means converts the target distribution by multiplying a value of each layer thickness ratio in the target distribution by a predetermined coefficient,
The predetermined coefficient is based on each volume per batch of ore and coke obtained by the charging amount obtaining means and each volume of ore and coke based on the target distribution before conversion. A target distribution conversion device for a blast furnace charge characterized by being defined. A method for converting a charge distribution, which is a distribution of a layer thickness ratio at each position of a predetermined furnace radius between an ore layer and a coke layer that are alternately stacked at the top of a blast furnace,
A charge acquisition step of acquiring each charge per batch of ore and coke into the blast furnace;
A target distribution acquisition step of acquiring a target distribution which is a target charge distribution in the operation of the blast furnace;
Conversion that converts the target distribution into a distribution that has a shape that approximates the shape of the target distribution acquired in the target distribution acquisition step and that matches the amount of ore and coke acquired in the charge acquisition step. And a target distribution conversion method for a blast furnace charge, characterized by comprising the steps of: A program for converting a charge distribution that is a distribution of a layer thickness ratio at each position of a predetermined furnace radius between an ore layer and a coke layer stacked alternately at the top of a blast furnace,
Computer
Receiving each charge per batch of ore and coke into the blast furnace and a target distribution that is a target charge distribution in the operation of the blast furnace, approximating and receiving the shape of the received target distribution A program for converting a target distribution of a blast furnace charge, which causes the target distribution to function as a means for converting the target distribution into a distribution having a shape that matches each charge of ore and coke.

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