JP5524020B2 - Blast furnace operating condition deriving method and blast furnace operating condition deriving apparatus using this method - Google Patents

Description

  The present invention relates to a method for deriving operation conditions for obtaining a target layer thickness distribution in a charge accumulation layer at the top of a blast furnace during operation, and a blast furnace operation condition deriving device using this method.

  In order to stabilize the operation of the blast furnace, it is important to maintain the layer thickness distribution of the charge accumulation layer in the blast furnace in an appropriate shape. For this purpose, after understanding the current layer thickness distribution of the charge deposit layer in the blast furnace in operation, predict how this layer thickness distribution will change, and based on this prediction, It is necessary to change the operating conditions so that the thickness distribution is an appropriate layer thickness distribution.

  As a method for predicting the layer thickness distribution of the charge deposit layer in the blast furnace, a method described in Patent Document 1 is known. In this method, the operating conditions and model parameters that best match the simulation results of the layer thickness distribution prediction using these operating conditions are saved from the past operating results data of the blast furnace, and the operating conditions are stored. When examining the change of the system, the operating condition closest to the proposed operating condition is extracted from the stored operating condition, and the simulation is performed using the model parameter corresponding to the extracted operating condition, thereby obtaining accuracy. Predict the layer thickness distribution of high deposit deposits.

Japanese Patent No. 3598824

  In the prediction of the layer thickness distribution, a blast furnace operator or the like creates a plurality of operation condition proposals based on experience and past operation results, and performs simulation based on these operation condition proposals. Predict the layer thickness distribution that occurs when the blast furnace is operated. If the predicted layer thickness distribution is an appropriate shape that realizes the desired blast furnace operation, the blast furnace operation is performed under the operating conditions used for the prediction, so that the layer thickness distribution of the blast furnace is an appropriate shape. Maintained. However, if the predicted layer thickness distribution is not an appropriate shape for realizing the desirable blast furnace operation, the operator or the like must again create a different operation condition plan and perform a simulation based thereon.

  Since the examination of the draft of the operating conditions and the change of the operating conditions by simulation are performed when the operating conditions are actually changed in order to make the blast furnace layer thickness distribution into an appropriate shape, The time cannot be secured for a long time. Therefore, it has been difficult to create a lot of operating condition proposals and perform simulations based on these operating condition proposals to predict a large number of layer thickness distributions. For this reason, it is difficult to reliably obtain a layer thickness distribution having a shape conforming to the appropriate layer thickness distribution from among the predicted layer thickness distributions, and as a result, it is possible to ensure operating conditions for obtaining an appropriate layer thickness distribution. It was difficult to derive.

  Furthermore, even if the operating conditions for obtaining an appropriate layer thickness distribution are obtained, when the operating conditions of the blast furnace are changed to the operating conditions obtained from the above simulation, the operating fluctuation of the blast furnace due to the change of the operating conditions If it is large, the operation state of the blast furnace may become unstable.

  Therefore, in view of the above problems, the present invention has an operating condition that makes the distribution of the charge accumulation layer in the blast furnace close to the target appropriate layer thickness distribution and stabilizes the operation state of the blast furnace. It is an object to provide a method for deriving and an operation condition deriving device using the method.

  Therefore, in order to solve the above problems, the present invention includes a furnace body that surrounds an internal space, and a charging portion that charges the charged material into the internal space to form a charged material accumulation layer. In the blast furnace in which the charging portion can change the charging position of the charge on the charge deposit layer, the layer thickness distribution of the charge deposit layer in the blast furnace is made close to the target layer thickness distribution. A method for deriving an operation condition, which is set in a reference setting step for setting a reference operation condition that is a blast furnace operation condition including a parameter related to the charging position for adjusting the layer thickness distribution, and the reference setting step A calculation condition creation step for creating a plurality of calculation operation conditions obtained by changing parameters included in the reference operation condition from the reference operation conditions, and a plurality of calculation operation conditions created in the calculation condition creation step. Of which, the charging position Excluded step for excluding predetermined conditions relating to requirements that lead to an increase in operational fluctuations, and for each operation remaining without removing the operation of the blast furnace from the reference operating conditions in the excluded step A prediction step for predicting a layer thickness distribution generated in the blast furnace after the change of the operation condition as a predicted layer thickness distribution when the operation condition is changed, and the target layer from the predicted layer thickness distribution predicted in the prediction step One or a plurality of predicted layer thickness distributions whose distribution states are similar to the thickness distribution, and the operation for calculation used when the predicted layer thickness distribution is predicted in the prediction step for at least a part of the selected predicted layer thickness distribution A selection step in which the condition is a selection operation condition.

  In this way, multiple operation conditions are created and the predicted layer thickness distribution that occurs in the blast furnace when the blast furnace is operated under each operation condition is predicted, corresponding to the predicted results, that is, multiple operation conditions. A suitable operating condition can be obtained by selecting a condition in which the layer thickness distribution close to the target layer thickness distribution is predicted from the layer thickness distributions to be performed.

  In addition, out of the multiple operational operating conditions created, the operational operating conditions corresponding to the requirements that lead to an increase in blast furnace operational fluctuations are excluded, and the selected operational conditions are selected from the remaining operational operational conditions. The fluctuation in operation when the operating condition of the blast furnace is changed from the operating condition to the selected operating condition can be suppressed, and thereby the operating state of the blast furnace after changing the operating condition can be stabilized.

  For example, in the exclusion step, the operation conditions for calculation in which a predetermined amount or more of charge is concentrated and charged in a specific region on the charge accumulation layer are excluded, and the remaining calculation operation conditions are excluded. By selecting the selected operating conditions, it is possible to suppress fluctuations in operation when the operating conditions of the blast furnace are changed from the standard operating conditions to the selected operating conditions, thereby stabilizing the operating state of the blast furnace after changing the operating conditions. Can do.

  Specifically, when the charge is concentrated and charged in a specific area on the charge accumulation layer, the charge accumulated like a mountain collapses in the area and flows into the adjacent area, resulting in particle size segregation. (Operational fluctuation) increases. When the particle size segregation increases in the charge deposit layer, the ventilation state in the charge deposit layer changes and the operation state becomes unstable. For this reason, the operation condition for calculation in which a predetermined amount or more of charge is concentrated and charged in a specific region on the charge accumulation layer is excluded, and the selected operation condition is selected from the remaining operation condition for calculation. By doing so, it is possible to suppress the flow of the charged material when the operating condition of the blast furnace is changed from the standard operating condition to the selected operating condition, and it is possible to suppress the operation fluctuation (flow segregation) caused by this flowing.

  Usually, the furnace body of the blast furnace has an inner wall surface having a circular cross section in the horizontal direction at a height position where the charge deposit layer is formed, and a charge portion is formed on the charge deposit layer. It is possible to change the radius of the circumference while charging the charge along the circumference around the central axis of the blast furnace. Therefore, in the exclusion process, the operating conditions of the blast furnace are changed from the standard operating condition to the selected operating condition by excluding the operating condition for calculation in which a predetermined amount or more of charges are concentrated and charged in the same circumferential area. It is possible to suppress the flow of the charged material when changing the flow rate, and to suppress the operation fluctuation (flow segregation) caused by this flow.

  Specifically, the charging unit is configured to load a supported portion supported so as to be capable of turning about the center axis of the blast furnace and a position away from the supported portion in the turning radius direction. And a position of the charging portion that changes in the turning radius direction. Therefore, in the operation condition for calculation, the upper surface of the charge accumulation layer is divided into a plurality of concentric circular regions arranged concentrically around the central axis of the blast furnace, and at each position in the turning radius direction corresponding to each concentric circular region. The upper limit value of the number of turns of the input unit is included as a parameter, and in the exclusion step, of the number of turns of the input unit at each position in the turning radius direction corresponding to each concentric circle region An operation condition for calculation that is at least partially larger than the upper limit value of the number of turns at the corresponding position in the turning radius direction in the parameter is excluded. By doing so, when the selected operating condition is selected from the remaining operating conditions for operation and the operating condition of the blast furnace is changed from the standard operating condition to the selected operating condition, the same circumferential area on the charge accumulation layer ( It is possible to prevent the charge from being concentrated and charged in the circumferential area. As a result, the inflow is suppressed and the operation fluctuation (flow segregation) due to this can be suppressed.

  Further, when the charging portion has the above-mentioned supported portion and the charging portion, a plurality of concentric regions arranged in a concentric manner with the upper surface of the charge deposit layer centered on the central axis of the blast furnace as the operation condition for calculation Divided into a plurality of concentric circular regions and a plurality of concentric circular regions adjacent to each other to form a plurality of region sets, and each region set at each position in the turning radius direction corresponding to each region set The upper limit value of the number of turns of the throwing portion is set as a parameter, and in the exclusion step, at least of the number of turns of the throwing portion at each position in the turning radius direction corresponding to each region set, respectively. An operation condition for calculation that is partly larger than the upper limit value of the number of turns in the corresponding region set in the parameter is excluded. Here, the number of turns of the making unit at the position in the turning radius direction corresponding to the region set is the number of turns of the making unit at each position in the turning radius direction corresponding to the plurality of concentric regions included in the region set. Is the sum of

  Even in this case, when the selected operation condition is selected from the remaining calculation operation conditions and the operation condition of the blast furnace is changed from the reference operation condition to the selected operation condition, it is adjacent to the turning radius direction on the charge accumulation layer. As a result, the amount of charged material charged into the plurality of circumferential regions is limited, and thus flow can be suppressed. As a result, operation fluctuation (particle size segregation) due to this flow can be suppressed.

  Further, when the charging portion has the above-mentioned supported portion and the charging portion, a plurality of concentric regions arranged in a concentric manner with the upper surface of the charge deposit layer centered on the central axis of the blast furnace as the operation condition for calculation The upper limit value of the number of turns of the charging portion at each position in the turning radius direction corresponding to each concentric region is respectively included as a first parameter, and the upper surface of the charge accumulation layer is Dividing into a plurality of concentric regions arranged concentrically around the central axis of the blast furnace, forming a plurality of region sets that are a part of these concentric regions and a plurality of concentric regions adjacent to each other. The upper limit value of the number of turns of the throwing portion at each position in the turning radius direction corresponding to each region set is included as a second parameter, and in the exclusion step, each corresponding to each concentric circle region. Operating conditions for calculation in which at least a part of the number of turns of the input portion at each position in the turning radius direction is larger than the upper limit value of the number of turns at the corresponding position in the turning radius direction in the first parameter; and There is a calculation operation condition in which at least a part of the number of turns of the input portion at each position in the turning radius direction corresponding to each region set is larger than the upper limit value of the number of turns in the region set corresponding to the second parameter. It is preferable to be excluded. Here, the number of turns of the making unit at the position in the turning radius direction corresponding to the region set is the number of turns of the making unit at each position in the turning radius direction corresponding to the plurality of concentric regions included in the region set. Is the sum of

  In this way, when the selected operating condition is selected from the remaining operational operating conditions and the operating condition of the blast furnace is changed from the standard operating condition to the selected operating condition, the same circumferential region on the charge accumulation layer is obtained. The amount of charge to be charged is limited, and the amount of charge to be charged to a plurality of circumferential regions adjacent to each other in the turning radius direction is limited. it can.

  The calculation condition creation step, the exclusion step, the prediction step, and the selection step are repeated in order, and the calculation condition creation step uses the selected operation condition selected in the selection step as the reference operation condition. It is preferred that operational conditions are created.

  According to this configuration, it is possible to efficiently obtain the operating conditions of the blast furnace to be changed from the reference operating conditions in order to make the layer thickness distribution in the blast furnace closer to the target layer thickness distribution. That is, by creating the operation condition for calculation based on the operation condition selected in the selection process, the layer thickness in the distribution state closer to the target layer thickness distribution than the predicted layer thickness distribution selected in the previous selection process The blast furnace to be changed from the standard operating conditions in order to bring the layer thickness distribution in the blast furnace closer to the target layer thickness distribution by searching for the operating conditions in which the distribution can be obtained and this layer thickness distribution is predicted Operating conditions can be obtained.

  In order to solve the above problems, the present invention comprises a furnace body that surrounds an internal space, and a charging portion that charges the charged material into the internal space to form a charged material accumulation layer. In the blast furnace in which the charging portion can change the charging position of the charge on the charge deposit layer, the layer thickness distribution of the charge deposit layer in the blast furnace is made close to the target layer thickness distribution. An apparatus for deriving an operation condition, wherein a reference operation condition that is a blast furnace operation condition including a parameter relating to the charging position for adjusting the layer thickness distribution is set, so that the set reference operation condition is set. A calculation condition creating unit that creates and stores a plurality of calculation operation conditions obtained by changing included parameters, and among the plurality of calculation operation conditions stored in the calculation condition creation unit, the device Pre-determined conditions for entry position And an exclusion unit that stores the remaining operation conditions for calculation excluding those corresponding to requirements that lead to an increase in operation fluctuations, and for each calculation stored in the exclusion unit from the reference operation conditions for the operation of the remaining blast furnace When the operating conditions are changed, the layer thickness distribution generated in the blast furnace after changing the operating conditions is predicted as the predicted layer thickness distribution, and each predicted layer thickness distribution and the predicted layer thickness distribution are used for the calculation. Selecting one or a plurality of predicted layer thickness distributions whose distribution states are similar to the target layer thickness distribution from among the predicted layer thickness distributions stored in association with the operational conditions, A selection unit that uses the operation condition for calculation associated with the predicted layer thickness distribution as the selected operation condition for at least a part of the selected predicted layer thickness distribution, and an output that outputs the selected operation condition selected by the selection unit to the outside Dress Provided with a door.

  In this way, multiple operation conditions are created and the predicted layer thickness distribution that occurs in the blast furnace when the blast furnace is operated under each operation condition is predicted, corresponding to the predicted results, that is, multiple operation conditions. A suitable operating condition can be obtained by selecting a condition in which the layer thickness distribution close to the target layer thickness distribution is predicted from the layer thickness distributions to be performed.

  In addition, when the operating conditions are changed from among the plurality of operating operating conditions created, by excluding the operating operating conditions with large blast furnace operating fluctuations, and selecting the selected operating conditions from the remaining operating operating conditions, Operational fluctuations when the operating conditions of the blast furnace are changed from the standard operating conditions to the selected operating conditions are suppressed, thereby stabilizing the operating state of the blast furnace after the operating conditions are changed.

  In addition, since the operation condition for calculation selected by the selection unit is output by the output device, it becomes possible for a blast furnace operator or the like to acquire the target operation condition quickly and accurately.

  For example, the selection unit excludes a calculation operation condition in which a predetermined amount or more of charge is concentrated and charged in a specific region on the charge accumulation layer, so that the selection unit remains Since the selected operating conditions are selected from the operational operating conditions, fluctuations in the operating conditions when the operating conditions of the blast furnace are changed from the standard operating conditions to the selected operating conditions can be suppressed, and the operating conditions of the blast furnace after the operating conditions are changed Can be stabilized.

  Usually, the furnace body of the blast furnace has an inner wall surface having a circular cross section in the horizontal direction at a height position where the charge deposit layer is formed, and a charge portion is formed on the charge deposit layer. It is possible to change the radius of the circumference while charging the charge along the circumference around the central axis of the blast furnace. Therefore, the exclusion unit excludes the operation condition for calculation in which a predetermined amount or more of charge is concentrated in the same circumferential area, thereby changing the operation condition of the blast furnace from the standard operation condition to the selection part. It is possible to suppress the flow of the charged material when changing to the selected selected operation condition, and it is possible to suppress the operation fluctuation (flow segregation) due to this flow.

  The system further includes a requirement creation unit that creates an exclusion requirement based on the operation conditions by inputting a plurality of past operation conditions of the blast furnace, and the exclusion unit corresponds to the exclusion requirement created by the requirement creation unit The requirement creation unit may create the exclusion requirement based on the parameters relating to the charging position for adjusting the layer thickness distribution in each of the past operation conditions that are input. Good.

  According to such a configuration, if past operating conditions are input, an exclusion condition is created based on this, so that compared with the case where the operator etc. sets the exclusion condition, the experience and knowledge of the blast furnace operation by the operator Appropriate exclusion requirements can be created regardless of the above.

  As described above, according to the present invention, a method for deriving an operation condition that makes the distribution of the charge accumulation layer in the blast furnace close to the target appropriate layer thickness distribution and stabilizes the operation state of the blast furnace. And an operation condition deriving device using this method can be provided.

It is a block diagram which shows schematic structure of the blast furnace which concerns on 1st Embodiment. It is an enlarged view which shows the upper part of the said blast furnace. It is a conceptual diagram for demonstrating the concentric area | region in the upper surface of the charge deposit layer in the said blast furnace. It is a functional block diagram which shows the structure of the operating condition derivation | leading-out apparatus of the blast furnace which concerns on this embodiment. It is a flowchart when deriving an operation condition in the operation condition deriving device. It is a figure which shows an example of reference | standard operation conditions. It is a figure which shows an example of the exclusion conditions prescribed | regulated by the number of turning of the turning chute in a tilting point. It is a functional block diagram which shows the structure of the operating condition derivation | leading-out apparatus of the blast furnace which concerns on 2nd Embodiment. It is a flowchart when deriving an operation condition in the operation condition deriving device. It is a figure which shows an example of the exclusion condition which the exclusion condition preparation part of the said operating condition derivation apparatus created. It is a figure which shows an example of the exclusion conditions prescribed | regulated by the turning number of the turning chute in a point group. It is a figure which shows an example of target layer thickness distribution.

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

  The operation condition deriving device (hereinafter also simply referred to as “derivative device”) for the blast furnace according to the present embodiment is a layer thickness distribution (target layer thickness distribution) that targets the layer thickness distribution of the charge accumulation layer in the blast furnace. The operating conditions of the blast furnace to obtain a distribution close to

  As shown in FIGS. 1 and 2, the blast furnace from which the operating conditions are derived by the deriving device includes a furnace main body having an inner wall surface 102 with a circular cross section in the horizontal direction, and an inner space surrounded by the inner wall surface 102. And a charging section 104 for charging the charged material into S. In the blast furnace 100 (that is, in the internal space S), a charge deposit layer is formed by depositing charges such as coke c and iron ore o charged by the charge portion 104. The operating state of the blast furnace 100 varies depending on the layer thickness distribution (or layer thickness ratio distribution) in the furnace radial direction in the charge deposit layer.

  The charging unit 104 can change the charging position of the charging material on the charging material accumulation layer. Specifically, the charging unit 104 can charge the charge along the circumference around the central axis Ce of the blast furnace 100 on the charge accumulation layer and change the radius of the circumference. Is possible. The charging section 104 includes a supported section 104a that is supported so as to be turnable about the center axis Ce of the blast furnace 100, and a charge that is charged at a position away from the supported portion in the turning radius direction. It is possible to change the position of the charging portion 104c in the turning radius direction. Specifically, the charging portion 104 extends from the central axis Ce of the blast furnace 100 along a vertical plane (the paper surface in FIGS. 1 and 2) including the central axis Ce, and is a supported end that is an end portion on the central axis Ce side. A portion 104a, a charging portion 104c that is an end portion on the furnace wall 101 side, and a main body portion 104b that connects the supported portion 104a and the charging portion 104c. In addition, the loading unit 104 rotates the insertion unit 104c along the vertical plane including the center axis Ce with the supported portion 104a as a rotation center (see arrow A in FIGS. 1 and 2). The tilt angle (tilt angle) α with respect to the central axis Ce can be changed. When the tilt angle α is changed, the charging position of the charging material in the radial direction of the blast furnace moves on the charging layer.

  In the blast furnace 100 of the present embodiment, a so-called turning chute is used as the charging portion 104, and the tilt angle α of the turning chute 104 is managed by the tilt point. This tilt point represents the tilt of the bowl-shaped swivel chute 104 that charges the charge into the blast furnace 100 while swiveling, and the tilt angle α of the swivel chute 104 designated in advance is a unique number. It is a representation. The tilt point of this embodiment is set from tilt point 1 to tilt point 20. At the tilt point 20, the turning chute 104 is in a state close to vertical, and as the number of points decreases, the turning chute 104 approaches horizontal, and at the tilt point 1, the state is closest to horizontal.

  More specifically, the upper surface of the charge accumulation layer is divided into a plurality of concentric circular regions (20 concentric circular regions in the present embodiment) arranged concentrically around the central axis Ce of the blast furnace 100 (see FIG. 3), and the central axis A first concentric region 201, a second concentric region 202, a third concentric region 203,..., A twentieth concentric region 220 are sequentially formed from Ce toward the furnace wall 101 side. Then, the tilt angle at which the charging position of the charging material charged from the turning chute 104 (specifically, the falling position of the charging material on the upper surface of the charging layer) becomes the first concentric region 201 is set. Similarly, the tilt point is the tilt point 2, the tilt angle at which the charging position is the second concentric region 202 is the tilt point 2, the tilt angle at which the charging position is the third concentric region 203 is the tilt point 3, and so on. The tilt angle at which the position becomes the twentieth concentric region 220 is set as the tilt point 20.

  In this embodiment, the tilt point of the turning chute at the time of charging the coke in each turn is called a coke tilting point, and the tilting point of the turning chute at the time of charging ore (iron ore, etc.) in each turn. This is called the ore tilt point.

  Next, the deriving device 10 will be described with reference to FIGS.

  The deriving device 10 includes a device main body 20, an input unit 12 that inputs data (information) to the device main body 20, and an output device 14 that outputs data (information) from the device main body 20 to the outside. The apparatus main body 20 derives and outputs the operating conditions of the blast furnace 100 based on the input data, and includes a condition creation unit (calculation condition creation unit) 22, an exclusion unit 23, a prediction unit 24, and a selection unit. 25.

  The input unit 12 inputs a plurality of types of data into the apparatus main body 20. Specifically, the input unit 12 includes a keyboard and is connected to the condition creation unit 22, the exclusion unit 23, and the selection unit 25. Thereby, the reference operation conditions (for example, the current blast furnace operation conditions, etc.) of the blast furnace 100 as a reference can be input from the input unit 12 to the condition creating unit 22, and are desired to be excluded from the exclusion unit 23 Operation conditions can be input, and a target layer thickness distribution (target layer thickness distribution) can be input to the selection unit 25.

  The input unit 12 of the present embodiment is configured with a keyboard, but may be another device such as a touch panel. Further, the derivation device 10 may be configured such that information such as the current operating conditions is directly input to the device main body 20 from a computer or the like used for controlling the blast furnace 100 or the like. Further, a common input unit 12 is connected to the condition creating unit 22, the exclusion unit 23, and the selection unit 25, and it is not necessary to input data through the common input unit 12. That is, different input units may be connected to the condition creation unit 22, the exclusion unit 23, and the selection unit 25, and data may be input from each input unit.

  Here, the operating conditions include parameters for adjusting the layer thickness distribution of the charge deposit layer in the blast furnace 100, such as parameters relating to the charge position of the charge. The operating conditions of the present embodiment include parameters such as the tilting point of the swivel chute 104, the amount of coke charged into the blast furnace 100 (input amount), the amount of ore charged into the blast furnace 100 (input amount), the sounding level, and the like. Included as

  The condition creation unit 22 creates a large number of operation conditions (operation conditions for calculation) by changing parameters included in the reference operation conditions. Specifically, when the standard operation condition input by the input unit 12 is acquired, the condition creating unit 22 creates and stores a large number of calculation operation conditions from the standard operation condition. Specifically, the condition creating unit 22 creates a calculation operation means obtained by changing a specific type of parameter from among a plurality of types of parameters included in the reference operation condition. In the present embodiment, only the tilt point is changed as a specific type of parameter. That is, the condition creating unit 22 changes the tilting point only from the reference operating condition while keeping the coke charging amount, the ore charging amount, the sounding level, etc. among the parameters of the reference operating condition. Create operational conditions for computation. The tilt point is changed at random. The condition creating unit 22 also stores the reference operation condition input by the input unit 12. In addition, the parameter changed in the condition preparation part 22 is not limited. For example, in this embodiment, only the tilt point is changed, but other parameters such as the sounding level may be changed independently, or a plurality of types of parameters may be changed simultaneously.

  In addition, the condition creating unit 22 creates a calculation operation condition from the reference operation condition by changing each parameter included in the reference operation condition within a predetermined range determined in advance from the parameter. By changing the parameters within a predetermined range, the condition creation means can efficiently create the operation condition for calculation that causes the layer thickness distribution in the distribution state close to the layer thickness distribution corresponding to the reference operation condition to be generated in the blast furnace. Can do. In addition, since the parameter change range is limited in this way, even if the blast furnace operation condition is changed to the created recalculation operation condition, the change in the surface profile before and after the change is reduced.

但し、「｜｜」は絶対値を意味し、Ｊ_ｍａｘはコークスと鉱石とを装入するときの旋回数の総和であり、Ｐ_ａｊは、シミュレーションで用いたｊ回目の旋回シュートの傾動ポイントであり、Ｐ_ｂｊは、基準操業条件のｊ旋回目の旋回シュートの傾動ポイントである。 The condition creation unit 22 according to the present embodiment creates all the operation conditions in which the distance D represented by the following formula (1) is within 2 from the setting of the ore tilt point of the standard operation conditions (see FIG. 6). In the present embodiment, only the setting of the ore tilting point is changed and the setting of the coke tilting point is fixed, but the setting of the coke tilting point may be changed. Moreover, you may make it change the setting of a coke tilting point, fixing an ore tilting point.

However, “||” means an absolute value, J _max is the total number of turns when charging coke and ore, and P _aj is the tilt point of the j-th turning chute used in the simulation. Yes, P _bj is the tilt point of the turning chute of the jth turn of the reference operating condition.

  The condition creation unit 22 receives the selected operation condition when the selection unit 25 outputs the selected operation condition to the condition creation unit 22, and uses this as the reference operation condition to create a number of operation conditions for calculation as described above. Store. Thereby, in the said derivation | leading-out apparatus 10, it becomes possible to repeat the process of deriving selection operation conditions from reference | standard operation conditions. That is, the condition creating unit 22 is based on the operation condition once derived as the operation condition for obtaining the layer thickness distribution close to the target layer thickness distribution, and further changes the parameters included in the operation condition to perform a number of calculations. By creating the operation condition, an operation condition (operation condition for calculation) that causes a layer thickness distribution closer to the target layer thickness distribution in the blast furnace than the layer thickness distribution corresponding to the derived operation condition is acquired. Make it possible. The condition creating unit 22 creates operating conditions that cause a layer thickness distribution closer to the target layer thickness distribution in the blast furnace each time the process is repeated.

  The exclusion unit 23 excludes predetermined calculation operation conditions from a large number of calculation operation conditions stored in the condition creation unit 22. Specifically, the exclusion unit 23 acquires a large number of operation conditions for calculation stored in the condition generation unit 22 from the condition generation unit 22, and among these operation conditions for calculation, the charge in the blast furnace 100 The remaining calculation operation conditions are stored by excluding predetermined conditions relating to the charging position and corresponding to requirements that lead to an increase in operation fluctuations. Specifically, the excluding unit 23 excludes an operation condition for calculation in which a predetermined amount or more of charge is concentrated and charged in a specific region on the charge accumulation layer. In the present embodiment, the charging chute 104 of the blast furnace 100 is swung while the charge is charged onto the charge deposit layer. Therefore, the same circumferential area (concentric areas 201, 202,...) On the charge deposit layer. 220 or the like), the operation condition for calculation in which a predetermined amount or more of charge is concentrated and charged is excluded.

  Specifically, the exclusion unit 23 has a predetermined exclusion condition (exclusion rule), and excludes the operation condition for calculation corresponding to the exclusion condition. This exclusion condition is input from the input unit 12. The exclusion condition of the present embodiment is defined by the tilt point of the swing chute 104 when the charge is inserted into the internal space S from the swing chute 104 and the number of turns at each tilt point. Specifically, the upper limit value of the number of turns of the turning chute at each tilt point is set (see FIG. 7), and the exclusion unit 23 is at least a part of the tilt points of the first to twentieth tilt points 201,. The operation condition for calculation in which the value of the number of turns in is larger than the upper limit value of the number of turns set in the exclusion condition is excluded. And the exclusion part 23 stores the operation condition for calculation which remained without being excluded among many operation conditions for calculation which the condition preparation part 22 produced.

  As described above, the exclusion unit 23 excludes the operation condition for calculation corresponding to the requirement that leads to the increase of the operation fluctuation of the blast furnace 100 among the many operation conditions for calculation created by the condition creation unit 22. Therefore, the operational fluctuation when the operating condition of the blast furnace is changed to the operating condition (selected operating condition) derived from the apparatus is suppressed, and the operating condition of the blast furnace after the operating condition is changed is thereby stabilized.

  Specifically, when a charge is concentrated and charged in a specific area on the charge accumulation layer, the charge accumulated like a mountain collapses in the area and flows into an adjacent area. Segregation (operational fluctuation) increases. When the particle size segregation increases in the charge deposit layer, the ventilation state in the charge deposit layer changes and the operation state becomes unstable. For this reason, the operation condition for calculation in which a predetermined amount or more of charge is concentrated and charged in a specific region on the charge accumulation layer is excluded, and the selected operation condition is selected from the remaining operation condition for calculation. In this way, the flow of charge is suppressed when the operating conditions of the blast furnace are changed from the standard operating conditions to the selected operating conditions derived from the equipment, and the fluctuations in operation (flow segregation) caused by this inflow are suppressed. can do.

  The blast furnace 100 of the present embodiment has an inner wall surface 102 having a circular cross section in the horizontal direction, and the swivel chute 104 is positioned along the circumference centered on the central axis Ce of the blast furnace on the charge accumulation layer. The charge is charged to the circumference and the radius of the circumference can be changed. Therefore, the exclusion unit excludes the operation condition for calculation in which a predetermined amount or more of charge is concentrated and charged in the same concentric circle region, so that the operation condition derived from the standard operation condition is derived from the blast furnace. Operating conditions with less inflow of charge when the operating conditions are changed. That is, an operation condition with less operation fluctuation (flow segregation) due to the inflow is obtained.

  In the present embodiment, as the exclusion condition, the upper limit value and the lower limit value of the number of turns of the turning chute 104 at each tilt point are all set to the same value, but may be set to different values (for example, (See FIG. 10).

  When the operation of the blast furnace 100 is changed from the reference operation condition to the operation condition for each operation stored in the exclusion unit 23, the prediction unit 24 calculates the layer thickness distribution generated in the blast furnace 100 after the change of the operation condition. Each is predicted (calculated) as a thickness distribution.

  Specifically, the prediction unit 24 acquires the reference operation condition stored in the condition creation unit 22 from the condition creation unit 22, and each operation condition for calculation stored in the exclusion unit 23 from the exclusion unit 23. (Operational conditions for calculation not corresponding to exclusion conditions) are acquired. And the prediction part 24 calculates the change of the state in the blast furnace (for example, the state of the charge accumulation layer, etc.) accompanying the change of the operation condition based on these reference operation conditions and each operation condition, The calculation result (that is, the predicted layer thickness distribution) is stored. At this time, the prediction unit 24 stores each predicted layer thickness distribution in association with the operation condition for calculation used when the predicted layer thickness distribution is predicted.

  In addition, although the prediction part 24 of this embodiment calculates the state in the blast furnace after operation condition change, etc. by calculation, it estimates the predicted layer thickness distribution based on the calculated result. The top surface shape, gas flow velocity distribution, particle size distribution, porosity distribution, and the like may be calculated (predicted).

  The selection unit 25 selects a predetermined calculation operation condition from among a large number of calculation operation conditions stored in the prediction unit 24 and stores it as the selected operation condition. Specifically, the selection unit 25 selects a predicted layer thickness distribution whose distribution state is closest to the target layer thickness distribution acquired from the input unit 12 from among a number of predicted layer thickness distributions stored in the prediction unit 24. And the selection part 25 acquires the operation condition for calculation linked | related with this prediction layer thickness distribution from the prediction part 24, stores this as a selection operation condition, and is also the prediction layer thickness distribution obtained from this selection operation condition Is stored.

但し、ＬＲ_ａｉは、高炉の各半径位置ｉでのシミュレーション結果のＬｏ／（Ｌｏ＋Ｌｃ）であり、ＬＲ_ｔｉは、高炉の各半径位置ｉでの目標とするＬｏ／（Ｌｏ＋Ｌｃ）である。また、Ｌｏ／（Ｌｏ＋Ｌｃ）は、鉱石層（Ｌｏ）及びコークス層（Ｌｃ）を合わせた層厚（Ｌｏ＋Ｌｃ）に対する鉱石層（Ｌｏ）の層厚比である（図２参照）。 Specifically, the selection unit 25 compares the target layer thickness distribution with each predicted layer thickness distribution stored in the prediction unit 24, and calculates an error value E thereof. This error value E is a value that serves as an index of the degree of similarity of the shapes when both layer thickness distributions are graphed using the layer thickness ratio. Specifically, it is a value calculated by the following equation (2).

However, LR _ai is Lo / (Lo + Lc) of a simulation result at each radial position i of the blast furnace, and LR _ti is a target Lo / (Lo + Lc) at each radial position i of the blast furnace. Lo / (Lo + Lc) is the layer thickness ratio of the ore layer (Lo) to the combined layer thickness (Lo + Lc) of the ore layer (Lo) and the coke layer (Lc) (see FIG. 2).

Then, the selection unit 25, calculating the error value E for all of the predicted layer thickness distribution which is stored in the prediction unit 24 compares the respective error value E calculated to select the smallest error value E _min, the error The predicted layer thickness distribution used when calculating the value E _min is derived. The selection unit 25 acquires the operation condition for calculation stored in the prediction unit 24 in association with the derived predicted layer thickness distribution as the selection operation condition, and stores it.

Further, the selection unit 25 compares the error value E _min with a predetermined threshold value set in advance. Selecting unit 25, while outputting it error value E _min is greater than the threshold value of the selection operating conditions in the condition creation unit 22, and outputs the selected operating conditions on the output device 14 if the error value E _min is smaller than the threshold value . When the selection unit 25 outputs the selected operation condition to the output device 14, the selection unit 25 also outputs the predicted layer thickness distribution corresponding to the selected operation condition to the output device 14.

  Note that the selection unit 25 stores a predetermined threshold value in advance. This threshold value is input from the input unit 12 to the selection unit 25.

  The output device 14 outputs data from the device main body 20 to the outside. The output device 14 displays (outputs) the selected operation condition selected by the selection unit 25 and the predicted layer thickness distribution corresponding to the selected operation condition. In the present embodiment, a liquid crystal display is used as the output device 14. However, the present invention is not limited to this, and may be another display device such as a CRT display or a printing device. A combination of these may also be used.

  In the derivation device 10 configured as described above, the operating conditions of the blast furnace for deriving the layer thickness distribution of the charge deposit layer in the blast furnace 100 to a distribution close to the target layer thickness distribution are derived as follows. FIG. 5 shows a flow when the operating condition is derived in the deriving device 10.

  First, standard operating conditions (for example, current operating conditions of the blast furnace: see FIG. 6) are input from the input unit 12 to the apparatus body 20 and stored in the condition creating unit 22 (step S1). As described above, the reference operating conditions include, as parameters, the amount of coke, the amount of ore, the sounding level, etc., in addition to the tilt points shown in the figure. Then, the target layer thickness distribution is input from the input unit 12 to the apparatus main body 20 and stored in the selection unit 25 (step S2), and an exclusion condition (see FIG. 7) is input from the input unit 12 to the apparatus main body 20 to be excluded. 23 (step S3). The steps S1 to S3 do not have to be performed in order, and may be performed simultaneously. Moreover, you may perform in different order, for example, the order of step S2, step S1, and step S3, the order of step S3, step S1, and step S2.

  When steps S1 to S3 are performed, the condition creating unit 22 creates a number of operation conditions for calculation from the stored reference operation conditions (step S4). Specifically, the condition creation unit 22 creates the operation condition for calculation by changing the tilt point in the parameters of the basic operation condition input from the input unit 12. At this time, the condition creating unit 22 creates the operation condition for calculation by randomly setting the tilt point of the basic operation condition. The condition creating unit stores a large number of operation conditions created in this way.

  When a large number of calculation operation conditions are created and stored by the condition creation unit 22, the exclusion unit 23 excludes the calculation operation conditions corresponding to the exclusion condition (step S5) and stores the remaining calculation operation conditions. Specifically, the exclusion unit 23 compares the value of the number of turns of the turning chute 104 for each tilt point in the calculation operation condition with the upper limit value of the number of turns at the corresponding tilt point in the exclusion condition (see FIG. 7). Then, when the value of the number of turns at each tilt point of the calculation operation condition is larger than the upper limit value of the number of turns at the corresponding tilt point in the exclusion condition, the exclusion unit 23 excludes (deletes) the calculation operation condition. If it is smaller, the operation condition for calculation is stored.

  When the operation unit for calculation corresponding to the exclusion condition is excluded from the large number of operation conditions for calculation created by the condition generation unit 22 by the exclusion unit 23 and the remaining operation conditions for calculation are stored, the prediction unit 24 The calculation conditions stored in the exclusion unit are sequentially extracted, and the predicted layer thickness distribution is predicted from each calculation operation condition. Specifically, the prediction unit 24 predicts the predicted layer thickness distribution by simulation using each operation condition for calculation stored in the exclusion unit 23 (step S6). The prediction unit 24 stores these predicted predicted layer thickness distributions in association with the operation conditions for calculation used when the predicted predicted layer thickness distribution is predicted.

  Next, the selection unit 25 selects the operating condition of the blast furnace to be changed from among the many predicted layer thickness distributions stored in the prediction unit 24 (step S7). Specifically, the selection unit 25 selects a predicted layer thickness distribution whose distribution state is closest to the target layer thickness distribution acquired from the input unit 12 from among a number of predicted layer thickness distributions stored in the prediction unit 24.

Specifically, the selection unit 25 calculates the error value E for all of the predicted layer thickness distribution which is stored in the prediction unit 24 to select the smallest error value E _min. Then, the selection unit 25 selects the predicted layer thickness distribution used when calculating the error value _Emin . Then, the selection unit 25 acquires the operation condition for calculation stored in the prediction unit 24 in association with the selected predicted layer thickness distribution from the prediction unit 24 as the selected operation condition.

The selection unit 25 compares the error value E _min with a predetermined threshold set in advance (Step S8). If the error value E _min is smaller than the threshold value, the selection unit 25 outputs the selected operation condition to the output device 14. The output device 14 receives the selected operation condition from the selection unit 25 and displays it (step S9).

On the other hand, if the error value E _min is larger than the threshold value, the selection unit 25 outputs the selected operation condition to the condition creation unit 22. When the selection operation condition is output from the selection unit 25 to the condition creation unit 22 in this way, the above steps S4 to S8 are repeated until the error value E _min becomes smaller than the threshold value in the selection unit 25, and the error value E _{When min} is smaller than the threshold value, the selected operation condition at that time is output to the output device 14 and displayed.

  According to the derivation device 10 as described above, a predicted layer thickness distribution generated in the blast furnace when a plurality of calculation operation conditions are created and the blast furnace is operated under each calculation operation condition is predicted, That is, since a condition in which a layer thickness distribution close to the target layer thickness distribution is predicted is selected from the layer thickness distributions corresponding to a plurality of operation conditions, a preferable operation condition can be obtained.

  Moreover, by excluding the operation conditions for calculation that correspond to the requirements that lead to an increase in the operation fluctuation of the blast furnace 100 among the plurality of operation conditions for calculation, by selecting the selected operation condition from the remaining operation conditions for calculation, The fluctuation in operation when the operating condition of the blast furnace is changed from the reference operating condition to the selected operating condition can be suppressed, and thereby the operating state of the blast furnace 100 after changing the operating condition can be stabilized.

  Further, in the derivation device 10 described above, an operation in which an excluded portion concentrates and charges a predetermined amount or more of a charge in a specific region (a specific concentric circle region in the present embodiment) on the charge accumulation layer. By selecting the selected operating conditions from the remaining operational operating conditions, the operating fluctuations when the operating conditions of the blast furnace are changed from the standard operating conditions to the selected operating conditions can be suppressed. As a result, the operating state of the blast furnace after changing the operating conditions can be stabilized.

  Next, a second embodiment of the present invention will be described with reference to FIGS. 8 to 10. The same reference numerals are used for the same components as those in the first embodiment, and a detailed description thereof is omitted. Only the details will be described.

  The apparatus body 20A of the derivation device 10A according to the present embodiment includes an exclusion condition creation unit 26 in addition to the condition creation unit 22, the exclusion unit 23, the prediction unit 24, and the selection unit 25 included in the device body 20 of the first embodiment. Prepare. The exclusion condition creation unit 26 includes a record value storage unit 27 and a creation unit 28, and creates an exclusion condition used by the exclusion unit 23.

  The actual value storage unit 27 stores past operation actual values of the blast furnace 100. The past operation result value is input from the input unit 12. In the present embodiment, the operating condition of the blast furnace 100 for the latest three months (in this embodiment, the value of the number of turns of the turning chute 104 at each tilting point) is used as the past operation result value. Moreover, when the period when it was malfunctioning (operation state is unstable) as the operation of the blast furnace is input from the input unit 12, the result value storage unit 27 adds this as malfunction information to the operation condition corresponding to this period. Store in state.

  In addition, although the past operation performance value of the blast furnace 100 is input from the input part 12 to the performance value storage part 27 of this embodiment, it is not limited to this, the performance value storage part 27 controls the blast furnace 100. You may connect to the said control apparatus etc. so that an operation performance value, a malfunction period, etc. may be input directly from a control apparatus etc.

  The creation unit 28 creates the exclusion requirement based on the past operation result value stored in the result value storage unit 27. Specifically, the creation unit 28 first obtains the maximum value and the minimum value of the number of turns of the turning chute 104 at the same tilt point of each operation condition stored in the actual value storage unit 27. At this time, the creation unit 28 obtains the maximum value and the minimum value from the remaining operation conditions excluding the operation conditions to which the malfunction information is added. The creation unit 28 sets the maximum value and the minimum value at each tilt point thus obtained as the upper limit value and the lower limit value of the number of turns of the turning chute at the tilt point, and outputs them to the exclusion unit 23 as an exclusion condition.

  The creation unit 28 according to the present embodiment outputs the created exclusion condition to the exclusion unit 23 without correction, but is not limited thereto. For example, the exclusion condition created by the creation unit 28 may be manually corrected by the operator of the derivation device 10A. In addition, the creation unit 28 uses information other than the past operation performance value acquired by the input from the input unit 12 and corrects the exclusion condition created based only on the past operation performance value, and then outputs it. It may be. As described above, by appropriately correcting the exclusion condition created based only on the past operation performance values, it is possible to set a more appropriate exclusion condition.

  The exclusion unit 23 stores the exclusion condition received from the creation unit 28, excludes the operation condition for calculation corresponding to this exclusion condition from the many operation conditions for calculation stored in the condition creation unit 22, Store.

  In the deriving device 10A configured as described above, the operating conditions of the blast furnace for deriving the layer thickness distribution of the charge deposit layer in the blast furnace 100 to a distribution close to the target layer thickness distribution are derived as follows. FIG. 9 shows a flow for deriving the operation condition in the deriving device 10A.

  First, the reference operation condition is input from the input unit 12 to the condition creating unit 22 (step S1), and the target layer thickness distribution is input to the selection unit 25 (step S2). Then, the operation result value (past operation condition) of the blast furnace 100 for the last three months and the period during which the operation of the blast furnace 100 in this period was unsatisfactory are input from the input unit 12 and stored in the result value storage unit 27. (Step S3A). The creation unit 28 creates an exclusion condition based on the past operation record value and malfunction information of the blast furnace 100 stored in the record value storage unit 27 (step S3B). Specifically, the creation unit 28 excludes the operation result value of the period in which the operation was not successful from the past operation result value, and the maximum value of the number of turns of the turning chute 104 at the same tilt point from the remaining operation result value and Find the minimum value respectively. Then, the creation unit 28 creates an exclusion condition in which the upper limit value and the lower limit value of the number of turns of the turning chute 104 at each tilt point are used (see FIG. 10). The creation unit 28 outputs this exclusion condition to the exclusion unit 23, which stores it.

  The steps S1 to S3B do not need to be performed in order. If step S3B is performed after step S3A, for example, step S1 and step S2, and step S3A and step S3B are performed in parallel. May be.

  When Steps S1 to S3B are performed in this way, Steps S4 to S9 are performed as in the first embodiment.

  According to the deriving device 10A as described above, it is possible to create an appropriate exclusion requirement regardless of the operating experience and knowledge of the blast furnace 100 by the operator of the device, and it is possible to reliably derive operating conditions with less operational fluctuations. The

  Normally, in the derivation device 10 that does not have the exclusion condition creation unit 26 as in the first embodiment, the exclusion condition is set based on knowledge obtained from the operating experience of the blast furnace such as the operator of the derivation device 10. Therefore, the exclusion condition may differ depending on the person who sets the exclusion condition, and in that case, the obtained operation condition (selected operation condition) is different. However, like the derivation device 10A of the present embodiment, the exclusion condition creating unit 26 creates the exclusion condition, so that the exclusion condition is created regardless of the operating experience of the blast furnace of the operator, etc. There is no variation in the exclusion conditions.

  In addition, the exclusion condition creation unit 26 is a past operation result value of the blast furnace excluding an operation result value during a period in which the operation was not successful in the actual operation of the blast furnace, that is, an operation result when the operation state is stable. Since exclusion conditions are created from values, it is easy to obtain appropriate exclusion conditions.

  The blast furnace operating condition deriving method and the blast furnace operating condition deriving apparatus using this method of the present invention are not limited to the first and second embodiments described above, but the gist of the present invention is as follows. Of course, various changes can be made without departing from the scope.

  In said 1st Embodiment and 2nd Embodiment, although exclusion conditions are the upper limit and lower limit of the number of turns for every tilting point, it is not limited to this. For example, as shown in FIG. 11, it may be an upper limit value and a lower limit value of the number of turns in a set (point set) of a plurality of tilt points adjacent to each other. The number of turns in this point set is the sum of the number of turns at a plurality of tilt points included in the point set. Specifically, a plurality of (two in FIG. 11) tilt points adjacent to each other are set as a set of points. More specifically, tilt point 1 and tilt point 2 are point set 1, tilt point 2 and tilt point 3 are point set 2, tilt point 3 and tilt point 4 are point set 3, and so on. 19 and tilt point 20 are set as a point set 19. For example, 2 which is the sum of the lower limit value of the number of turns of the tilt point 10 and the lower limit value of the number of turns of the tilt point 11 is the lower limit value of the number of turns of the point set 10, and the upper limit value of the number of turns of the tilt point 10. And 7 that is the sum of the upper limit value of the number of turns of the tilt point 11 and the upper limit value of the number of turns of the point set 10.

  With the number of turns in such a point set as an exclusion condition, the exclusion unit 23 may exclude a corresponding computation exclusion condition from the numerous computation operation conditions created by the condition creation unit 22. In this way, by limiting the number of turns of the point set as an exclusion condition, the amount of charge charged in an area composed of a plurality of adjacent concentric areas (see FIG. 3) on the upper surface of the charge accumulation layer is limited. be able to. For example, depending on the upper limit value of the number of turns of the point set 9, the charge to be charged in the region where the ninth concentric region 209 corresponding to the tilt point 9 and the tenth concentric region 210 corresponding to the tilt point 10 are combined. Charge amount is limited.

  Therefore, when the selected operating condition is selected from the remaining operating conditions for which the operating condition corresponding to the excluded condition is excluded, and the operating condition of the blast furnace is changed from the standard operating condition to the selected operating condition, a plurality of adjacent It is possible to prevent the charging material from being concentrated in a region composed of the concentric circular regions, thereby suppressing the inflow of the charging.

  Further, the excluding unit excludes the operation condition for calculation corresponding to either the first excluding condition defined by the number of turns of the tilt point or the second excluding condition defined by the number of turns of the point set. Also good. Specifically, the first exclusion condition is an upper limit value and a lower limit value of the number of turns for each tilt point (see, for example, FIG. 10), and the second exclusion condition is an upper limit value and a lower limit value for each point set (for example, FIG. 11). reference). And an exclusion part excludes the operation condition for calculation applicable to any one of a 1st exclusion condition and a 2nd exclusion condition from many operation conditions for calculation which the condition preparation part 22 produced.

  By doing so, in addition to limiting the amount of charge to be charged in the same concentric area, the amount of charge to be charged in an area composed of a plurality of adjacent concentric areas is reduced. Limited.

  Therefore, when the selected operating condition is selected from the remaining operating conditions for which the operating condition corresponding to the excluded condition is excluded, and the operating condition of the blast furnace is changed from the standard operating condition to the selected operating condition, the same concentric area It is prevented that the charge is charged in a concentrated manner, and the charge is prevented from being concentrated in a region where a plurality of adjacent concentric regions are combined. The flow of charge can be suppressed more reliably.

  In the said 2nd Embodiment, although the operation performance value and malfunction information (information of the period when operation was unsatisfactory) for the last 3 months of the blast furnace 100 are input into the performance value memory | storage part 27, operation was unsatisfactory. You may make it input except the operation performance value of a period. As a result, when the creation unit 28 creates the exclusion condition, it is not necessary to exclude the operation result value for the period of the malfunction from the operation result value for the last three months input from the input unit 12. The configuration of the unit 28 can be simplified.

  Moreover, in said 1st Embodiment and 2nd Embodiment, although the operating conditions of the bell-less type blast furnace provided with the turning chute as the charging part 104 are derived, the operating conditions of other types of blast furnaces are derived. Also good. In other words, the introduction part is capable of charging the charge at a position along the circumference centered on the central axis of the blast furnace on the charge accumulation layer and charging the charge so that the radius of the circumference can be changed. A blast furnace provided with Specifically, a bell-arm type blast furnace or the like may be used as long as a charge can be charged for each concentric region as shown in FIG. In this case, the exclusion condition is defined not by the number of turns at each tilting point but by the extrusion amount (notch) of the movable armor and the charging amount of the charge.

  Here, the derivation result of the operating condition of the blast furnace actually performed using the derivation | leading-out apparatus 10 of 1st Embodiment is demonstrated. In this example, in order to evaluate the derivation result of the operation condition by the derivation device 10 of the first embodiment, the operation condition derivation having the same configuration as that of the derivation device 10 of the first embodiment except that no exclusion unit is provided. Compared with the result of deriving the operation condition by the device (other operation condition deriving device).

  Specifically, in the derivation device 10 of the first embodiment, (i) the one shown in FIG. 6 is input as the reference operation condition, (ii) a predetermined target layer thickness distribution (see FIG. 12) is input, ( iii) The exclusion conditions shown in FIG. 10 were input. The results thus obtained are shown below.

  An error value E (value obtained from the above equation (2)) between the layer thickness distribution (expected layer thickness distribution) obtained under the operating conditions in this table and the target layer thickness distribution shown in FIG. 12 is shown below.

  On the other hand, the other operating condition deriving device (i) inputs the reference operating condition shown in FIG. 6 and (ii) the same target layer thickness distribution as the deriving device 10 (see FIG. 12). ) Was entered. The results thus obtained are shown below.

  An error value E (value obtained from the above equation (2)) between the layer thickness distribution (expected layer thickness distribution) obtained under the operating conditions in this table and the target layer thickness distribution shown in FIG. 12 is shown below.

  From the above two error values E, it can be seen that the operating condition that provides a layer thickness distribution close to the target layer thickness distribution comparable to that of the other operating condition deriving apparatuses can be obtained from the deriving apparatus 10 of the first embodiment.

  And since the derivation | leading-out apparatus 10 of 1st Embodiment is provided with the exclusion part, compared with the operation conditions obtained from the other operation condition derivation | leading-out apparatuses, the obtained operation conditions are changed from the standard operation conditions to the said operation conditions. When the operation of the blast furnace is changed, the operation fluctuation (particle size segregation) caused by the flow can be further suppressed.

  Next, an operation including an exclusion unit that excludes a calculation operation condition corresponding to either the first exclusion condition defined by the number of turns of the tilt point or the second exclusion condition defined by the number of turns of the point set. The result of deriving the operating conditions of the blast furnace actually performed using the condition deriving device will be described. This operation condition deriving device has the same configuration as the deriving device 10 of the first embodiment, except for an excluding unit that uses the first excluding condition and the second excluding condition. In this embodiment, two tilt points adjacent to each other are set as a set of points.

  In this derivation device 10, (i) the one shown in FIG. 6 is input as the reference operation condition, (ii) the same target layer thickness distribution (see FIG. 12) as in the first embodiment is input, and (iii) the first The one shown in FIG. 10 was input as one exclusion condition, and (iv) the one shown in FIG. 11 was inputted as the second exclusion condition. The results thus obtained are shown below.

  An error value E (value obtained from the above equation (2)) between the layer thickness distribution (expected layer thickness distribution) obtained under the operating conditions in this table and the target layer thickness distribution shown in FIG. 12 is shown below.

  From this error value E, the operation condition deriving device of the second embodiment can also obtain an operation condition that provides a layer thickness distribution close to the target layer thickness distribution similar to the two operation condition deriving devices of the first embodiment. I understand that.

  In addition, in the exclusion part of the operation condition deriving device of the second embodiment, the number of turns is defined not only by the number of turns of each tilt point but also by the set of tilt points. When the operation is changed, the operation fluctuation (particle size segregation) caused by the flow can be more effectively suppressed.

10, 10A Operation condition deriving device 20, 20A Device main body 22 Condition creation unit (calculation condition creation unit)
23 Exclusion unit 24 Prediction unit 25 Selection unit 26 Exclusion condition creation unit 100 Blast furnace 102 Inner wall surface 104 Turning chute (charging unit)
Ce Central axis of blast furnace S Internal space of blast furnace α Tilt angle

Claims (11)

A furnace body that surrounds the internal space, and a charging portion that charges the charge into the internal space to form a charge deposit layer, and the charge portion is charged on the charge deposit layer. In a blast furnace in which the charging position of an object can be changed, a method of deriving operating conditions for making the layer thickness distribution of the charge deposit layer in the blast furnace close to the target layer thickness distribution,
A standard setting step for setting a standard operating condition which is a blast furnace operating condition including a parameter relating to the charging position for adjusting the layer thickness distribution;
A calculation condition creation step for creating a plurality of calculation operation conditions obtained by changing parameters included in the reference operation conditions from the reference operation conditions set in the reference setting step,
Among the plurality of operation conditions for operation created in the operation condition creation step, an exclusion step of excluding those that are predetermined conditions related to the charging position and that correspond to requirements that lead to an increase in operation fluctuations;
When the operation of the blast furnace is changed from the reference operation condition to the operation condition for operation remaining without being excluded in the exclusion step, the layer thickness distribution generated in the blast furnace after the change of the operation condition is set as the predicted layer thickness distribution. A prediction process to predict each,
One or a plurality of predicted layer thickness distributions having a distribution state similar to the target layer thickness distribution are selected from the predicted layer thickness distributions predicted in the prediction step, and the predicted layer of at least a part of the selected predicted layer thickness distributions. A blast furnace operating condition derivation method comprising: a selecting step in which the operating condition for calculation used when the thickness distribution is predicted in the predicting step is the selected operating condition. In the blast furnace operating condition derivation method according to claim 1,
A method for deriving operating conditions for a blast furnace in which, in the excluding step, operating conditions for operation in which a predetermined amount or more of charges are charged in a specific area on the deposit layer are excluded. In the blast furnace operating condition derivation method according to claim 2,
The furnace body of the blast furnace has an inner wall surface in which a horizontal section is circular at a height position where the charge deposit layer is formed,
The charging unit can charge the charge along a circumference centered on a central axis of the blast furnace on the charge deposit layer and change a radius of the circumference. ,
A method for deriving operating conditions of a blast furnace in which in the excluding step, operating conditions for calculation in which a predetermined amount or more of charges are concentrated and charged in a region of the same circumference are excluded. In the blast furnace operating condition derivation method according to claim 3,
The charging section includes a supported section that is supported so as to be able to swivel about the center axis of the blast furnace, and a charge on the charge deposit layer at a position away from the supported portion in the swiveling radial direction. And a position of the charging portion is changed in the turning radius direction.
The operation condition for the calculation is divided into a plurality of concentric circular regions arranged concentrically around the central axis of the blast furnace and the upper surface of the charge accumulation layer at each position in the turning radius direction corresponding to each concentric circular region. What defines the upper limit value of the number of turns of the input part is included as a parameter,
In the exclusion step, an upper limit value of the number of turns at a position in the turning radius direction corresponding to at least a part of the number of turns of the input portion at each position in the turning radius direction corresponding to each concentric region A method for deriving operating conditions for a blast furnace in which operating conditions for operation larger than the above are excluded. In the blast furnace operating condition derivation method according to claim 3,
The charging section includes a supported section that is supported so as to be able to swivel about the center axis of the blast furnace, and a charge on the charge deposit layer at a position away from the supported portion in the swiveling radial direction. And a position of the charging portion is changed in the turning radius direction.
The operation condition for calculation includes a plurality of concentric circular regions that are a part of the concentric circular regions divided into a plurality of concentric circular regions arranged concentrically around the central axis of the blast furnace. Are formed as a set of parameters, each of which defines an upper limit value of the number of turns of the input portion at each position in the turning radius direction corresponding to each area set. ,
In the excluding step, at least a part of the number of turns of the input portion at each position in the turning radius direction corresponding to each region set is larger than the upper limit value of the number of turns in the region set corresponding to the parameter. Operating conditions are excluded,
The number of turns of the charging unit at the position in the turning radius direction corresponding to the region set is the sum of the number of turns of the charging unit at each position in the turning radius direction corresponding to each of the plurality of concentric regions included in the region set. A method for deriving operating conditions for a blast furnace. In the blast furnace operating condition derivation method according to claim 3,
The charging section includes a supported section that is supported so as to be able to swivel about the center axis of the blast furnace, and a charge on the charge deposit layer at a position away from the supported portion in the swiveling radial direction. And a position of the charging portion is changed in the turning radius direction.
The operation condition for the calculation is divided into a plurality of concentric circular regions arranged concentrically around the central axis of the blast furnace and the upper surface of the charge accumulation layer at each position in the turning radius direction corresponding to each concentric circular region. The upper limit value of the number of revolutions of the charging unit is included as a first parameter, and the upper surface of the charge accumulation layer is divided into a plurality of concentric regions arranged concentrically around the central axis of the blast furnace. A plurality of concentric circular regions that are part of the concentric circular regions and adjacent to each other are formed as a set, and a plurality of concentric circular regions are formed. The upper limit value of the number of turns is set as the second parameter.
In the excluding step, at least a part of the number of turns of the input portion at each position in the turning radius direction corresponding to each concentric region is the number of turns at the position in the turning radius corresponding to the first parameter. Turning in the region set in which at least a part of the operating condition for calculation larger than the upper limit value and the number of turns of the input portion at each position in the turning radius direction corresponding to each region set corresponds to the second parameter Operating conditions that are larger than the upper limit of the number are excluded,
The number of turns of the charging unit at the position in the turning radius direction corresponding to the region set is the sum of the number of turns of the charging unit at each position in the turning radius direction corresponding to each of the plurality of concentric regions included in the region set. A method for deriving operating conditions for a blast furnace. In the blast furnace operating condition derivation method according to any one of claims 1 to 6,
The calculation condition creation step, the exclusion step, the prediction step, and the selection step are repeated in order,
In the calculation condition creation step, a blast furnace operation condition derivation method in which the calculation operation condition is created using the selected operation condition selected in the selection step as the reference operation condition. A furnace body that surrounds the internal space, and a charging portion that charges the charge into the internal space to form a charge deposit layer, and the charge portion is charged on the charge deposit layer. An apparatus for deriving operating conditions for making the layer thickness distribution of the charge accumulation layer in the blast furnace close to the target layer thickness distribution in a blast furnace capable of changing the charging position of the object,
It is obtained by changing the parameters included in the set reference operating conditions by setting the reference operating conditions which are blast furnace operating conditions including the parameters relating to the charging position for adjusting the layer thickness distribution. A calculation condition creating unit for creating and storing a plurality of calculation operation conditions;
Of the plurality of calculation operation conditions stored in the calculation condition creation unit, the remaining calculation is performed by excluding a predetermined condition related to the charging position and corresponding to a requirement that leads to an increase in operation fluctuation. An exclusion section for storing operating conditions;
When the operation of the blast furnace is changed from the reference operation condition to the operation condition for operation stored in the exclusion unit, the layer thickness distribution generated in the blast furnace after the change of the operation condition is predicted as the predicted layer thickness distribution, respectively. A prediction unit that stores each predicted layer thickness distribution and the operation condition for calculation used when the predicted layer thickness distribution is predicted;
One or a plurality of predicted layer thickness distributions whose distribution states are similar to the target layer thickness distribution are selected from the predicted layer thickness distributions stored in the prediction unit, and at least a part of the selected predicted layer thickness distribution is predicted. A selection unit having a calculation operation condition associated with the layer thickness distribution as a selection operation condition;
A blast furnace operating condition derivation device comprising: an output device that outputs the selected operating condition selected by the selection unit to the outside. In the blast furnace operating condition deriving device according to claim 8,
The blast furnace operating condition derivation device, wherein the excluding unit excludes a calculation operating condition in which a predetermined amount or more of charge is concentrated and charged in a specific region on the charge deposit layer. In the blast furnace operation condition deriving device according to claim 9,
The furnace body of the blast furnace has an inner wall surface in which a horizontal section is circular at a height position where the charge deposit layer is formed,
The charging unit can charge the charge along a circumference centered on a central axis of the blast furnace on the charge deposit layer and change a radius of the circumference. ,
The blast furnace operating condition derivation device, wherein the excluding unit excludes a calculation operating condition in which a predetermined amount or more of charge is concentrated and charged in a region of the same circumference. In the blast furnace operation condition derivation device according to any one of claims 8 to 10,
A requirement creating unit for creating an exclusion requirement based on the operation conditions by inputting a plurality of past operation conditions of the blast furnace;
The exclusion unit excludes the operation condition for calculation corresponding to the exclusion requirement created by the requirement creation unit,
The operating condition deriving device for a blast furnace, wherein the requirement creating section creates the exclusion requirement based on a parameter relating to the charging position for adjusting a layer thickness distribution in the input past operating conditions.

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