JP2005206848A - Method for controlling amount of raw material charged into blast furnace, program therefor and method for operating blast furnace - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for controlling the amount of a raw material to be charged into a blast furnace, which controls the variation of a discharging rate from an FCG during charging; a program therefor; and an operating method therefor. <P>SOLUTION: The method for controlling the amount of the raw material to be charged into the blast furnace comprises: a standard-opening-calculating step of determining the standard opening of the gate for adjusting the flow rate of the raw material from a relationship between a charging rate and the opening of the gate for adjusting the flow rate of the raw material based on actual results; a target-speed-calculating step of determining a target charging rate from a weight of a remaining raw material after having finished one slewing of a distribution chute and a remaining slewing period of time; an actual-charging-rate-calculating step of determining an actual charging rate in one slewing of the distribution chute; a dynamic-correction-quantity-calculating step of determining a dynamic correction quantity on the basis of the target charging rate and the actual charging rate; an opening-command-value-calculating step of determining the opening command value for the gate for adjusting the flow rate of the raw material on the basis of the standard opening and the dynamic correction quantity; and an opening-adjusting step of adjusting the opening of the gate for adjusting the flow rate of the raw material during slewing the distribution chute on the basis of the opening command value. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a raw material charging control technique for a blast furnace bell-less charging facility.

  Conventionally, the opening degree control of the raw material flow rate adjustment gate (FCG) of the blast furnace bell-less charging facility has been performed as follows.

  For example, in the technique described in Patent Document 1, the target charging speed is obtained from the planned charging raw material weight and the planned charging time, and the FCG opening (reference opening) that can realize the target charging speed is obtained in the past. Determine from the data. The target opening is compensated with the corrected opening that feeds back the error at the time of the previous charging and the corrected opening that is fed forward based on the actual material discharge time at the unwinding equipment. Control is performed so that the charging of the raw material is completed at the position of the distribution chute.

In the technique described in Patent Document 2, the relationship between the FCG opening degree and the charging speed is always corrected using actual values, and the charging of the raw material is completed at the target distribution chute position based on this relationship. The reference opening degree of the FCG at the time of charging is changed so that it does.
JP-A-2-254111 JP-A-4-198412

  However, in the techniques described in Patent Documents 1 and 2, the reference opening of the FCG is determined at the time of charging, and is kept constant during charging. Therefore, if the discharge state of the raw material from the FCG being charged is constant, it can be controlled stably. However, if the discharge speed from the FCG varies during the charging, the charging of the raw material is completed. The position of the distribution chute at that time cannot be set as the target value.

  FIG. 8 is a diagram showing an example of actually measuring how the weight of the charged raw material changes with time. If the charging speed is constant, the characteristic shown by the dotted line in FIG. 8 is obtained, but in the actual machine, the characteristic shown by the solid line is obtained. That is, it is indicated that the discharging speed during charging is not constant. Therefore, control accuracy cannot be obtained with the conventional control method.

  The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a blast furnace raw material charging control method, a program thereof, and an operating method capable of suppressing discharge rate fluctuations from FCG during charging. And

  The blast furnace raw material charging control method according to claim 1 according to the present invention for achieving the above object, the raw material stored in the blast furnace top bunker is adjusted with an opening degree of a raw material flow rate adjustment gate provided in the bunker. Then, a raw material charging control method in a blast furnace in which a raw material is charged into the furnace by a swiveling distribution chute, wherein the distribution chute has a target charging based on the weight of the remaining raw material at the end of a predetermined number of turns and the remaining swirling time. Dynamic correction based on a target speed calculation step for determining a speed, an actual charging speed calculation step for determining an actual charging speed in the predetermined number of turns of the distribution chute, and the target charging speed and the actual charging speed A dynamic correction amount calculating step for determining an amount, and an opening command value calculating step for determining an opening command value of the raw material flow rate adjustment gate based on a predetermined reference opening and the dynamic correction amount , On the basis of the opening command value, and an opening adjustment step of adjusting the raw material flow rate control gate opening during turning of the distribution chute.

  The blast furnace raw material charging control method according to claim 2 of the present invention is the blast furnace raw material charging control method according to the invention described above, wherein the opening degree adjusting step is performed in a predetermined manner after the distribution chute starts turning. After turning a number of times, the opening degree of the raw material flow rate adjustment gate is adjusted during turning of the distribution chute based on the opening degree command value.

  The blast furnace raw material charging control method according to claim 3 according to the present invention is the blast furnace raw material charging control method according to the invention described above, wherein the dynamic correction amount calculating step has a calculated dynamic correction amount within a predetermined range. If not, the predetermined correction amount is set as a new dynamic correction amount.

  According to a fourth aspect of the present invention, there is provided a blast furnace raw material charging control method comprising: a step of generating a reference opening function from a relationship between a charging speed based on actual results and an opening of a raw material flow rate adjustment gate; Determining the target charging speed from the weight of the raw material to be distributed and the set number of revolutions of the distribution shooter, determining the reference opening of the raw material flow adjustment gate from the reference opening function and the target charging speed, and the previous charging The relationship between the speed, the previous target charging speed and the reference opening function and the process for obtaining the feedback correction amount based on the previous feedback correction amount, and the discharge weight and discharge time of the raw material from the hopper based on the results are shown. A step of obtaining an approximate expression, a step of obtaining a feedforward correction amount based on the weight discharged from the hopper of the raw material to be charged this time, a discharge time, and the approximate expression, and a reference opening of the raw material flow rate adjustment gate. Obtaining the opening command value of the raw material flow rate adjustment gate based on the feedback correction amount and the feedforward correction amount, and adjusting the opening amount of the raw material flow rate adjustment gate based on the opening command value of the raw material flow rate adjustment gate; A step of obtaining a target charging speed from the weight of the remaining raw material at the end of a predetermined number of turns of the distribution chute and a remaining turning time; a step of obtaining an actual charging speed in the predetermined number of turns of the distribution chute; and the target charging speed Determining a dynamic correction amount based on the actual charging speed, determining a new opening command value of the raw material flow rate adjustment gate based on the opening command value and the dynamic correction amount, And a step of adjusting the opening of the raw material flow rate adjusting gate during the turning of the distribution chute based on the new opening command value.

  According to a fifth aspect of the present invention, the program stored in the blast furnace top bunker adjusts the opening of the raw material flow rate adjustment gate provided in the bunker, and enters the furnace by a rotating distribution chute. A target speed calculation step for obtaining a target charging speed from a weight of a remaining raw material and a remaining turning time when the distribution chute ends turning a predetermined number of times, a program for controlling the raw material charging in a blast furnace for charging the raw material, An actual charging speed calculating step for determining an actual charging speed in the predetermined number of turns of the distribution chute; a dynamic correction amount calculating step for determining a dynamic correction amount based on the target charging speed and the actual charging speed; An opening command value calculation step for obtaining an opening command value of the raw material flow rate adjustment gate based on a predetermined reference opening and the dynamic correction amount; Based on the opening command value, to execute the opening degree adjusting step of adjusting an opening degree of the raw material flow rate control gate during the turn of the distribution chute to the computer.

  The program according to claim 6 of the present invention is the program according to the invention described above, wherein the opening degree adjusting step includes the opening degree command value after the distribution chute starts turning and turns a predetermined number of times. Based on the above, the opening of the raw material flow rate adjustment gate is adjusted while the distribution chute is turning.

  Further, the program according to claim 7 of the present invention is the program according to the invention described above, wherein the dynamic correction amount calculating step performs a predetermined correction when the calculated dynamic correction amount is not within a predetermined range. The amount is set as a new dynamic correction amount.

  The program according to claim 8 of the present invention is a program for controlling raw material charging of a blast furnace, and generates a reference opening function from a relationship between a charging speed based on results and an opening of a raw material flow rate adjusting gate. Determining the target charging speed based on the weight of the raw material to be charged this time and the set number of revolutions of the distribution shooter, and determining the reference opening of the raw material flow rate adjustment gate from the reference opening function and the target charging speed. A step, a step of obtaining a feedback correction amount based on the previous charging speed, the previous target charging speed and the reference opening function, and the previous feedback correction amount, and the discharge weight and discharge time of the material from the hopper based on the results And calculating an approximate expression indicating the relationship between the two, a discharge weight of the raw material to be charged this time from the hopper, a discharge time, and the feed formula based on the approximate expression. Obtaining the opening command value of the raw material flow rate adjustment gate based on the step of obtaining the word correction amount, the reference opening degree of the raw material flow rate adjustment gate, the feedback correction amount and the feedforward correction amount, and the opening command value of this raw material flow rate adjustment gate A step of adjusting the opening of the raw material flow rate adjustment gate based on the above, a step of obtaining a target charging speed from the weight of the remaining raw material at the end of turning the predetermined number of times of the distribution chute and the remaining turning time, and the predetermined number of times of the distribution chute Determining the actual charging speed in turning; determining the dynamic correction amount based on the target charging speed and the actual charging speed; and based on the opening command value and the dynamic correction amount. A step of obtaining a new opening command value of the raw material flow rate adjustment gate, and based on this new opening command value, during the turning of the distribution chute And a step of adjusting the opening of the serial raw material flow rate control gate into the computer.

  Moreover, the blast furnace operating method according to the ninth aspect of the present invention operates using the blast furnace raw material charging control method according to the invention described above.

  According to the present invention, it is possible to suppress fluctuations in the discharge speed from the FCG being charged.

  FIG. 1 is a diagram showing a charging control apparatus to which a raw material charging control method according to the present invention is applied and related facilities of a blast furnace.

  First, the operation of blast furnace related equipment will be described.

  A predetermined amount of ore and coke, which are raw materials charged into the blast furnace, are cut out for each brand from a raw material tank (not shown) and transferred to the weighing hopper 14. Then, after the weight is measured by the weight sensor 22 provided in the weighing hopper 14, the raw material is conveyed by a belt conveyor (not shown) at a predetermined timing and is carried to the top of the blast furnace.

  The raw material conveyed to the furnace top of the blast furnace is temporarily stored in the lower bunker 10 via the furnace top equipment (not shown). The lower bunker 10 is provided with a weight sensor 19 for measuring the weight of the raw material inside the lower bunker.

  An FCG 11 that is a raw material flow rate adjustment gate is provided at the lower part of the lower bunker 10. The flow rate of the discharged raw material can be adjusted by adjusting the opening of the FCG 11. Note that the FCG opening degree is measured by the FCG opening degree meter 20.

  When a command for charging the raw material into the blast furnace 12 is issued from an operation control device (not shown), the FCG 11 opens the gate and discharges the raw material to the distribution chute 13. The distribution chute 13 changes the angle of its tip while turning in the blast furnace furnace 12 at a predetermined speed. As a result, the raw material is uniformly dispersed in the furnace and charged. The lower bunker 10 is provided with a raw material discharge sensor 21 that detects the start and end of raw material charging.

  Next, the configuration of the charging control device 1 will be described.

  The charging control device 1 includes an input / output control unit 2, a reference opening calculation unit 3, an FF (Feed Forward) opening correction amount calculation unit 4, an FB (Feed Back) opening correction amount calculation unit 5, a DC (Dynamic Control). ) An opening correction amount calculation unit 6, an opening setting unit 7, and a data memory 8 are included.

  The input / output control unit 2 receives the process signal measured by each sensor provided in the related equipment of the blast furnace, the operation state signal of each equipment from the operation control device (not shown), and sets the opening degree for the FCG 11 Control the output of the signal.

  The reference opening calculation unit 3 obtains a target charging speed from the planned charging raw material weight and the planned charging time, and determines an FCG opening (reference opening) that can realize the target charging speed.

  The FF opening correction amount calculation unit 4 calculates the correction amount of the reference opening based on the actual discharge amount and the actual discharge time from the weighing hopper 14 for the raw material to be charged. The FB opening correction amount calculation unit 5 calculates the correction amount of the reference opening based on the deviation between the previous target charging speed and the actual charging speed. The DC opening correction amount calculation unit 6 calculates a reference opening correction amount based on the target charging speed and the actual charging speed during the turning operation of the distribution chute 13.

  The opening setting unit 7 corrects the reference opening calculated by the reference opening calculation unit 3 with the correction amounts calculated by the FF opening correction amount calculation unit 4 and the FB opening correction amount calculation unit 5, and stores them in the FCG 11. Set and output as the initial opening. Further, the opening setting unit 7 corrects the initial opening with the correction amount calculated by the DC opening correction amount calculation unit 6 and sets and outputs the opening to the FCG 11 at a predetermined timing during the turning operation of the distribution chute 13. To do.

  The data memory 8 stores data used for each opening calculation described above, past charging result data, and the like.

  Next, the operation of the charging control device 1 will be described.

  The data memory 8 stores actual data on the charging speed and the opening degree of the FCG 11. Here, the charging speed is a value obtained by calculation based on the charging time of the raw material measured based on the output of the raw material passage sensor 21 and the charging weight from the weight sensor 22. FIG. 2 is a diagram showing an example of the contents of the result data. For example, charging speed data is stored every 0.1 ° for each opening section (10 °) of the FCG 11 for each raw material brand.

  The reference opening degree calculation unit 3 obtains an average value of the charging speed for each opening degree based on the actual data, and then, as shown in FIG. A diagram is created, and a reference opening function approximated to a curve (for example, a cubic function) is generated from the scatter diagram as shown in FIG. For example, the function shown in Expression (1) is generated.

θ = av ³ + bv ² + cv + d (1)
Here, θ: opening degree, v: average speed, a, b, c, d: coefficient Subsequently, the reference opening degree calculation unit 3 is based on the charging weight and the preset number of turns of the distribution chute. The target charging speed vo is obtained from equation (2).

vo = charge weight ÷ (scheduled number of turns × 1 turn time) (2)
Then, based on the target charging speed vo and, for example, the reference opening function of Expression (1), the reference opening θo of the FCG 11 is calculated by Expression (3).

θo = avo ³ + bvo ² + cvo + d Equation (3)
Next, the FB opening correction amount calculation unit 5 obtains a feedback correction amount (hereinafter referred to as FB correction amount) Δθ1 by the following calculation. FIG. 4 is an explanatory diagram for obtaining the FB correction amount Δθ1.

  First, the error Δv at the time of the previous insertion of the same brand is obtained from the data memory 8 by the equation (4).

Δv = Previous actual charging speed−Previous target charging speed Equation (4)
Then, from this Δv and the reference opening θo (= f (vo)) with respect to the current target charging speed vo, the reference opening θo ′ after error correction is obtained by Equation (5).

θo ′ = f (vo−Δv) (5)
A reference opening correction amount (theoretical value) Δθo1 is obtained by equation (6).

Δθo1 = θo′−θo (6)
Next, the FB correction amount Δθ1 is obtained by Expression (7) from the Δθo1, the correction gain G1 (0 to 1), and the previous FB correction amount.

Δθ1 = G1 × Δθo1 + preceding FB correction amount (7)
Next, the FF opening correction amount calculation unit 4 calculates a feedforward correction amount (hereinafter referred to as FF correction amount) Δθ2 by the following calculation.

  In the data memory 8, discharge time information from the weighing hopper 14 and discharge weight information from the weight sensor 22 are accumulated and stored. FIG. 5 is a diagram showing an example of the contents of this data. For example, with respect to the relationship between the discharge weight of the unwinding weigher and the discharge time for each raw material brand, the latest data, for example, 300 pieces are stored for each raw material brand.

  Based on the data in the data memory 8, the FF opening correction amount calculation unit 4 creates a scatter diagram of the discharge time with respect to the weight as shown in FIG. 6A, and as shown in FIG. 6B. For example, an equation (8) obtained by linearly approximating the scatter diagram is calculated.

ω = αt + β (8)
Then, the FF opening correction amount calculation unit 4 obtains the current discharge speed α ′ by Expression (9) based on the current charging weight ω ′ and the discharge time t ′.

α ′ = (ω′−β) / t ′ (9)
Next, from the ratio α ′ / α of the discharge speed α ′ with respect to the standard discharge speed α, the predicted speed when charging is performed at the reference opening θo (= f (vo)) with respect to the current target charging speed vo. v ′ is obtained by equation (10), and the predicted speed error Δv is obtained by equation (11).

v ′ = vo × α ′ / α (10)
Δv = v′−vo (11)
Next, a calculation similar to the FB correction amount calculation is performed from Δv to obtain a correction amount (theoretical value) Δθ02, and the FF correction amount Δθ2 is expressed by Equation (12) by using Δθ02 and the correction gain G2 (0 to 1). Ask for.

Δθ2 = G2 × Δθ02 (12)
The opening setting unit 7 adds the FB correction amount Δθ1 and the FF correction amount Δθ2 to the reference opening θo, and uses the added signal (= θ0 + θ1 + θ2) as the opening command value of the FCG 11 for the driving device (not shown). ).

  Then, the drive device opens the FCG 11 at the commanded opening and starts supplying the raw material to the distribution chute 13.

  Next, a method for controlling the opening degree of the FCG 11 while the distribution chute 13 is turning will be described. FIG. 7 is a time chart showing how to calculate and set the opening degree of the FCG 11. The vertical axis in FIG. 7 indicates the opening of the FCG 11, and the horizontal axis indicates the time that elapses from left to right. The number of turns of the distribution chute 13 is clearly shown in the turning section.

  In the first turning section of the distribution chute 13, the DC opening correction amount calculation unit 6 does not operate. This is because the data collected in this section is considered inferior in terms of reliability because the turning motion is not yet stable in the first turn.

  In the second turning section of the distribution chute 13, the DC opening correction amount calculation unit 6 starts dynamic control.

First, DC opening correction amount calculation unit 6 determines the remaining weight W ₁ and the time T ₁ of the lower bunker 10 from the first pivot end weight sensor 19, during the second turning ends, residual weight W of the lower bunker 10 determine the ₂ and the time _{T 2.} Then, the actual charging speed Vd ′ is calculated by Expression (13), and the target charging speed Vd is calculated by Expression (14) using the remaining turning time Tr of the distribution chute 13.

Vd ′ = (W ₁ −W ₂ ) ÷ (T ₂ −T ₁ ) (13)
Vd = W ₂ / Tr (14)
In addition, when calculating | requiring the weight of the lower bunker 10, since the weight value is influenced by the pressure in a blast furnace furnace, the value which performed pressure correction is used.

Then, a dynamic control correction amount (hereinafter referred to as a DC correction amount) Δθ _DC is obtained by Expression (15).

Δθ _DC = G3 × c × (Vd′−Vd) (15)
Here, G3: opening change gain, c: FCG opening control parameter.

  The opening control parameter c has a different value depending on the brand whether the raw material to be charged is ore or coke, the charging mode in which the weight to be charged is 1 batch or 2 batches, and the like.

Next, it is checked whether or not the DC correction amount Δθ _DC is within a predetermined limit range (within the opening limiter). If the DC correction amount Δθ _DC is within the opening limiter, the value is adopted as the DC correction amount Δθ _DC. If it is not within the degree limiter, the opening degree limit value is adopted as the DC correction amount Δθ _DC . It should be noted that the value employed when not within the opening limiter may be 0, or may be a predetermined value set in advance.

Next, the opening setting unit 7 adds the DC correction amount Δθ _DC to the current opening of the FCG 11 (= θ0 + θ1 + θ2), and uses the added signal (= θ0 + θ1 + θ2 + Δθ _DC ) to open the FCG 11 in the third turning section. A degree command value is output to the driving device (not shown). As shown in FIG. 7, at the start of the third turn, the opening degree of the FCG 11 is changed by this opening degree command value.

  For the sections after the third turning section, the same procedure as described above is repeated. That is, the processing procedure is generalized and described as processing in an n-turn section as follows.

The DC opening correction amount calculation unit 6 obtains the remaining weight W _n−1 of the lower bunker 10 at the end of the (n−1) th turn and the time T _n−1 from the weight sensor 19, and at the end of the nth turn, the lower bunker 10 The remaining weight W _n and time T _n are obtained. Then, the actual charging speed Vd ′ (n) in the n-th turn is calculated by Expression (16), and the target charging speed Vd (n) is calculated by Expression (17) using the remaining turning time Tr _n of the distribution chute 13. calculate.

Vd ′ (n) = (W _n−1 −W _n ) ÷ (T _n −T _n−1 ) (16)
Vd (n) = W _n ÷ Tr _n (17)
When obtaining the weight of the lower bunker 10, the weight value is affected by the pressure in the blast furnace, so the pressure corrected value is used.

Then, a dynamic control correction amount (hereinafter referred to as a DC correction amount) Δθ _DC is obtained by Expression (18).

Δθ _DC = G3 × c × (Vd ′ (n) −Vd (n))
+ G4 × c × {(Vd ′ (n) −Vd (n)) − (Vd ′ (n−1) −Vd (n−1))}
... Formula (18)
Here, G3, G4: opening change gain, c: FCG opening control parameter.

  Note that the second term is added to the right side of Expression (18) as compared to Expression (15). The first term on the right side contributes to the opening degree control of the FCG 11 as an I operation (integration operation). On the other hand, the second term on the right side contributes to the deviation as a P action (proportional action). Accordingly, errors accumulate only with the first term, but control accuracy can be improved by adding the second term.

Next, it is checked whether or not the DC correction amount Δθ _DC is within a predetermined limit range (within the opening limiter). If the DC correction amount Δθ _DC is within the opening limiter, the value is adopted as the DC correction amount Δθ _DC. If it is not within the degree limiter, the opening degree limit value is adopted as the DC correction amount Δθ _DC . It should be noted that the value employed when not within the opening limiter may be 0, or may be a predetermined value set in advance.

Next, the opening setting unit 7 adds the DC correction amount Δθ _DC to the current opening of the FCG 11 and uses the added signal as the opening command value of the FCG 11 in the (n + 1) th turning section. (Shown).

  When the raw material discharge sensor 21 detects that all of the raw material has been discharged from the lower bunker 10 in the nineteenth turning section of FIG. 7, the dynamic control is terminated.

  According to the present embodiment, various effects described below can be obtained.

  (1) In the opening degree control of the present embodiment, the opening degree of the FCG 11 while the distribution chute 13 is turning is set as a correction value for the reference opening degree determined before turning. When controlling targets that are difficult to grasp as precise quantitative data, such as blast furnace raw material charging, and whose process reproducibility is affected by various factors, control this process. This is because, as described in the embodiment, a method in which the control is performed in a range in which the reference opening is not greatly deviated from the reference opening is suitable for stable control.

  (2) Further, an opening limiter is provided to provide a predetermined limit on the correction amount. For this reason, even when an inappropriate correction amount is calculated due to an error of the measurement signal or the like, the control accuracy is not greatly reduced.

  (3) Furthermore, dynamic control is started after a predetermined number of times (two turns) have elapsed since the distribution chute 13 started turning. In consideration of the characteristics of the charging process described above, an error is often generated in the measurement signal at the initial stage of turning, which is effective in preventing a decrease in control accuracy.

  In this embodiment, the FCG reference opening is corrected using the FF correction amount, the FB correction amount, and the DC correction amount. However, the FCG reference opening is corrected using the DC correction amount. This is because, by performing dynamic control that may be controlled, control that takes into account the FF correction amount and the FB correction amount can be expected.

  In this embodiment, the correction amount calculation and the control output are performed for each turn of the distribution chute. However, the present invention is not limited to this mode, and the correction amount calculation and the control output may be performed for a plurality of times of the distribution chute. good. It is also possible to perform stable control without performing control output every time.

  It should be noted that the functions described in the above embodiments are not limited to being configured using hardware, but can be realized by causing a computer to read a program describing each function using software. Each function may be configured by appropriately selecting either software or hardware.

  Furthermore, each function can be realized by causing a computer to read a program stored in a storage medium (not shown). Here, as long as the storage medium in this embodiment can store a program and can be read by a computer, the storage format may be any form.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

The figure which shows the related equipment of the charging control apparatus and blast furnace which applied the raw material charging control method which concerns on this invention. The figure which shows an example of the content of performance data. The figure explaining the relationship between a charging speed and an opening degree. Explanatory drawing for calculating | requiring FB correction amount. The figure which shows an example of the content of a data memory. The figure explaining the relationship between discharge weight and discharge time. The time chart which shows the calculation / setting method of the opening degree of FCG. The figure which shows a mode that the weight of the raw material charged changes with time passage.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Loading control apparatus, 3 ... Reference | standard opening calculation part, 4 ... FF opening correction amount calculation part, 5 ... FB opening correction amount calculation part, 6 ... DC opening correction amount calculation part, 7 ... Opening setting , 8 ... Data memory, 10 ... Lower bunker, 11 ... Raw material flow adjustment gate (FCG), 13 ... Distribution chute, 14 ... Weighing hopper, 19 ... Weight sensor, 20 ... FCG opening meter, 21 ... Raw material discharge sensor, 22: Weight sensor.

Claims (9)

This is a raw material charging control method in a blast furnace in which the raw material stored in the blast furnace top bunker is adjusted by opening the raw material flow rate adjustment gate provided in the bunker and the raw material is charged into the furnace by a rotating distribution chute. And
A target speed calculation step for obtaining a target charging speed from the weight of the remaining raw material and the remaining turning time when the distribution chute has finished turning a predetermined number of times;
An actual charging speed calculating step for determining an actual charging speed in the predetermined number of turns of the distribution chute;
A dynamic correction amount calculating step for obtaining a dynamic correction amount based on the target charging speed and the actual charging speed;
An opening command value calculation step for obtaining an opening command value of the raw material flow rate adjustment gate based on a predetermined reference opening and the dynamic correction amount;
A blast furnace raw material charging control method, comprising: an opening degree adjusting step for adjusting an opening degree of the raw material flow rate adjustment gate during turning of the distribution chute based on the opening degree command value.   The opening adjustment step adjusts the opening of the raw material flow rate adjustment gate during turning of the distribution chute based on the opening command value after the distribution chute starts turning and turns a predetermined number of times. The blast furnace raw material charging control method according to claim 1, wherein   3. The blast furnace according to claim 1, wherein the dynamic correction amount calculating step sets a predetermined correction amount as a new dynamic correction amount when the calculated dynamic correction amount is not within a predetermined range. Raw material charging control method. A step of generating a reference opening function from the relationship between the charging speed based on the results and the opening of the raw material flow adjustment gate;
A process for obtaining a target charging speed from the weight of the raw material charged this time and the set number of revolutions of the distribution shooter;
Obtaining a reference opening of the raw material flow rate adjustment gate from the reference opening function and the target charging speed;
Both from the previous charging speed, the previous target charging speed and the reference opening function and the feedback correction amount based on the previous feedback correction amount, and the discharge weight and discharge time of the raw material from the hopper based on the results Obtaining an approximate expression indicating the relationship of
A step of obtaining a feedforward correction amount based on the weight discharged from the hopper of the raw material charged this time, the discharge time, and the approximate expression;
An opening command value of the raw material flow rate adjustment gate is obtained based on the reference opening degree of the raw material flow rate adjustment gate, the feedback correction amount, and the feed forward correction amount. Adjusting the opening; and
Obtaining the target charging speed from the weight of the remaining raw material at the end of the predetermined number of turns of the distribution chute and the remaining turning time;
Obtaining the actual charging speed in the predetermined number of turns of the distribution chute;
Obtaining a dynamic correction amount based on the target charging speed and the actual charging speed;
Obtaining a new opening command value of the raw material flow rate adjustment gate based on the opening command value and the dynamic correction amount;
And a step of adjusting the opening of the raw material flow rate adjustment gate during the turning of the distribution chute based on the new opening command value. A program for controlling raw material charging in a blast furnace in which the raw material stored in the blast furnace top bunker is adjusted by opening the raw material flow rate adjustment gate provided in the bunker and the raw material is charged into the furnace by a rotating distribution chute Because
A target speed calculating step for obtaining a target charging speed from the weight of the remaining raw material and the remaining turning time when the distribution chute has finished turning a predetermined number of times;
An actual charging speed calculating step for determining an actual charging speed in the predetermined number of turns of the distribution chute;
A dynamic correction amount calculating step for obtaining a dynamic correction amount based on the target charging speed and the actual charging speed;
An opening command value calculation step for obtaining an opening command value of the raw material flow rate adjustment gate based on a predetermined reference opening and the dynamic correction amount;
A program for causing a computer to execute an opening degree adjusting step for adjusting the opening degree of the raw material flow rate adjustment gate during turning of the distribution chute based on the opening degree command value.   The opening adjustment step adjusts the opening of the raw material flow rate adjustment gate during turning of the distribution chute based on the opening command value after the distribution chute starts turning and turns a predetermined number of times. The program according to claim 5, wherein the program is characterized by:   8. The program according to claim 6, wherein the dynamic correction amount calculating step sets a predetermined correction amount as a new dynamic correction amount when the calculated dynamic correction amount is not within a predetermined range. . In the program that controls the charging of blast furnace raw materials,
A step of generating a reference opening function from the relationship between the charging speed based on the results and the opening of the raw material flow adjustment gate;
Obtaining the target charging speed from the weight of the raw material charged this time and the set number of revolutions of the distribution shooter;
Obtaining a reference opening of the raw material flow rate adjustment gate from the reference opening function and the target charging speed;
Both the step of obtaining the feedback correction amount based on the previous charging speed, the previous target charging speed and the reference opening function and the previous feedback correction amount, and the discharge weight and discharge time of the raw material from the hopper based on the results Obtaining an approximate expression indicating the relationship of
A step of obtaining a feedforward correction amount based on the weight discharged from the hopper of the raw material charged this time, the discharge time and the approximate expression;
An opening command value of the raw material flow rate adjustment gate is obtained based on the reference opening degree of the raw material flow rate adjustment gate, the feedback correction amount, and the feed forward correction amount. Adjusting the opening; and
Obtaining a target charging speed from the weight of the remaining raw material at the end of the predetermined number of turns of the distribution chute and the remaining turning time;
Determining the actual charging speed in the predetermined number of turns of the distribution chute;
Obtaining a dynamic correction amount based on the target charging speed and the actual charging speed;
Obtaining a new opening command value of the raw material flow rate adjustment gate based on the opening command value and the dynamic correction amount;
A program for causing a computer to execute the step of adjusting the opening of the raw material flow rate adjustment gate during the turning of the distribution chute based on the new opening command value.   A blast furnace operating method, wherein the operation is performed using the blast furnace raw material charging control method according to any one of claims 1 to 4.

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