JP2004183007A - Method for controlling extracting pitch in hot-rolling plant - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make controllable the change of an extracting reference of a material to be rolled in the case of predicting what a referential value is exceeded by predicting an electric power value based on the rolling schedule. <P>SOLUTION: An extracting pitch control in a hot-rolling plant is provided with a first power predicting step S1, a second power predicting step S2, a power demand predicting step S4, a comparing step S5 and a controlling step S6. The first power predicting step S1 predicts the electric power based on a conveying schedule predicted with a combustion schedule in the hot-rolling plant. The second power predicting step S2 predicts the electric power based on the conveying schedule predicted by the rolling schedule of the hot-rolling plant. The power demand predicting step S4 predicts the power demand consumed in the whole hot-rolling plant based on the power predicted value predicted by the first and the second power predicting steps and the actual power value in the hot-rolling plant. The comparing step S5 compares the power demand predicting value predicted by the power demand predicting step with the preset power limiting value. The controlling step S6 controls the extracting pitch of the material to be rolled in the case the power demand predicting value exceeds the power limiting value based on the compared result. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an extraction pitch control method in a hot rolling plant for steel, non-steel, and the like.
[0002]
[Prior art]
In the hot rolling plant, the extraction pitch from the heating furnace is large, because the baking pitch of the rolled material charged into the heating furnace and the minimum pitch due to the restriction on the rolling line side are based on maximizing the capacity of the equipment. The pitch is usually determined using one.
[0003]
Alternatively, there is a method in which a pitch that minimizes energy cost is used as an extraction pitch based on an extraction pitch determined from a pitch from an upstream charged into a heating furnace, a baking capacity of the heating furnace, and a rolling production capacity on a rolling side. (For example, see Patent Document 1).
[0004]
[Patent Document 1]
Japanese Patent No. 2,635,548 [0005]
[Problems to be solved by the invention]
On the other hand, up to now, pitch correction has not been normally performed in view of the amount of power consumed by the entire hot rolling plant, because the above-mentioned "based on maximizing the use of equipment capacity".
[0006]
Generally, if the production interval (pitch) in a rolling line is increased, the amount of power per unit time is reduced. Also, the amount of power consumption varies depending on the relationship between the input material (material, loss, size, etc.) and the target finished product (temperature, size, etc.).
[0007]
In particular, when a new kind of material, a new processing method of a material, or a product of a new size is to be made in the existing equipment, the amount of power that was originally assumed may be exceeded. In such a case, if an upper limit of the electric energy is set in advance and is set to be within the upper limit, it is necessary for the operator to intervene while observing the electric energy which changes every moment and the schedule of the next material.
[0008]
The present invention has been made to solve the above-described problem, and predicts the power demand near the extraction time, and automatically disables the power limit value in a rolling line in which the power limit value is set so as to keep the value. An object of the present invention is to provide an extraction pitch control method in a hot rolling plant capable of controlling the extraction pitch of a rolled material.
[0009]
[Means for Solving the Problems]
An extraction pitch control method in a hot rolling plant according to the present invention includes a first power prediction step of predicting power based on a transfer schedule predicted by a combustion schedule of the hot rolling plant, and a rolling schedule of the hot rolling plant. A second power prediction step of predicting power based on the predicted transfer schedule; and a hot power prediction step based on the predicted power value predicted by the first and second power prediction steps and the actual power value of the hot rolling plant. A power demand prediction step of predicting power demand consumed by the entire rolling plant; a comparison step of comparing a power demand prediction value predicted by the power demand prediction step with a preset power limit value; and When the power demand forecast value exceeds the power limit value based on the comparison result, the extraction It is obtained by a control step of controlling the switch.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiment 1 FIG.
FIG. 1 is a flowchart for explaining an extraction pitch control method in a hot rolling plant according to Embodiment 1 of the present invention. As shown in FIG. 1, in step S1, power prediction is performed based on a transfer schedule predicted by a combustion schedule of a hot rolling plant. In step S2, power prediction is performed based on a transfer schedule predicted by a rolling schedule of the hot rolling plant. Further, in step S3, the actual power value is calculated based on the result collection related to the power calculation in the hot rolling plant.
[0011]
In step S4, the power demand consumed by the entire hot rolling plant is predicted based on the predicted power value obtained in steps S1 to S3 and the actual power value of the hot rolling plant. The predicted power demand is stored in the storage unit for each time, and is compared with a preset power limit value in step S5. In step S6, based on the comparison result of the comparison step, when the predicted power demand value exceeds the power limit value, and when the time is before the next extraction time, the extraction pitch of the non-rolled material is corrected and controlled.
[0012]
FIGS. 2 and 3 show a hot rolling process including a continuous heating furnace and a hot rolling device in a hot rolling plant, for explaining an extraction pitch control method in the hot rolling plant described above. 3 shows a transfer scheduler. As shown in FIG. 2, in the present invention, the baking schedule in the heating furnace 1 and the rolling schedule in the hot rolling apparatus 2 are determined based on the maximum capacity of each of the continuous heating furnace 1 and the hot rolling apparatus 2. Then, the pitch derived from the predicted baking time of the material before and after the non-rolled material 3 charged in the heating furnace 1 is compared with the input pitch determined by the rolling processing capacity when they are input to the hot rolling device 2. The heating furnace extraction pitch determined by this is adopted as the pitch.
[0013]
In FIG. 3, the trajectory of the leading end and the tail end of the non-rolled material 3 when a certain non-rolled material 3 is put into the rolling line and conveyed is shown with the time on the vertical axis and the position on the horizontal axis. At the same time, the amount of power consumed by each device according to the progress (time) of rolling is shown.
[0014]
Hereinafter, an extraction pitch control method in the hot rolling plant according to Embodiment 1 of the present invention will be described with reference to these drawings. The transfer schedule in the heating furnace and the rolling line is predicted from the size of the material to be rolled 3 and the rolling schedule. It captures the amount of power performance of each machine that is a total power of a portion at the time of calculation (tx in FIG. 3), respectively _{P M1,} P M2, · · _·, and _{P MN,} other water, oil pump, etc. Assuming that the other drive power amounts are also taken and P _U1 , P _U2 ,..., P _UN , the sum at the time tx (the power amount is targeted between -tp and tx) is It becomes what is shown in a formula.
_Ptx-tp = _PM1 + _PM2 + ... + _PMN + _PU1 + _PU2 + ... + _PUN
[0015]
Further, the predicted value of the electric energy for the future is t = t _f1 (taken in small increments as t _f1 , t _f2 ...), And the electric energy of each machine is represented by P _f1M1 , P _f1M2,. , P _f1MN , P _f1U1 , P _f1U2 ,..., P _f1UN , the total sum is as shown in the following equation.
_{P f1 = P f1M1 + P f1M2} + ··· + P f1MN + P f1U1 + P f1U2 + ··· + P f1UN
[0016]
In order to keep the time span for calculating the electric energy constant, the past time is calculated by shortening by t _f1 . Prediction _{P E1} of the electric power amount by the P _tx-tp-tf1 is as shown in the following equation.
P _E1 = P _{tx−tp−tf1} + P _f1
[0017]
Similarly, the power amounts P _E2 , P _E3 ,..., P _En at t = t _f2 , t = t _f3 ,..., T = t _fn are predicted. At this time, in the same way, the calculation for the past is also shortened by t _f2 , t _f3 ,..., T = t _fn from the reference time. The result is assumed to be _Ptx-tp-tf1 . That is,
P _Ei = P _tx −t _fi + P _fi
It becomes. The predicted value P _Ei is compared with the reference value P _B, and i is sequentially increased. If the time point that first exceeds P _B is smaller than the pitch T _pitchx calculated from the heating furnace and mechanical constraints, the extracted pitch Delay.
[0018]
At this time, the extraction pitch is delayed little by little by Δt, and the power amount is predicted again. If the electric energy enters the reference value after k × Δt, ie,
TPITCH = TPITCH ten k × Δt
Becomes a new extraction pitch.
[0019]
Therefore, according to the first embodiment, the power demand near the extraction time is predicted, and the power demand is controlled by controlling the extraction pitch of the non-rolled material so that the predicted power demand does not exceed the power limit value. Value can be controlled.
[0020]
Embodiment 2 FIG.
In the second embodiment, when the predicted power demand value is expected to exceed the power limit value by a predetermined time in the extraction pitch control step of steps S5 to S6 shown in FIG. To do.
[0021]
That is, as shown in FIG. 4, in step S41, the hot rolling line power controller _determines a _{P Ei = P tx -t fi +} P fi, Yuki by sequentially increasing the i is compared with a reference value _{P B,} the first time point exceeds the reference value P _B becomes n minutes, transmits the n minutes. In step S42, the receiving device receives the transmitted n minutes, displays it on the display unit, and sounds the buzzer. Similarly, in step S43, the distant receiving device receives n minutes transmitted via the receiving device and displays it on the display unit.
[0022]
Therefore, according to the second embodiment, if the power demand forecast value is predicted to exceed the set power limit value in the vicinity of n minutes later, an alarm can be sounded and the operator can be alerted, and the user can be far away. Information can be transmitted to the office and monitored.
[0023]
Embodiment 3 FIG.
In the third embodiment, the present invention is applied to a case where a plurality of hot rolling plants are operated in parallel. For each hot rolling plant, the prediction and control of the above-described steps S1-S6 in FIG. The result of the above is monitored at a higher rank, and the total amount of the power demand forecast value in the plants of the plurality of hot rolling plants exceeds the total power limit value, and the power demand forecast value in any of the hot rolling plants exceeds the power limit value. If it is predicted that the time will exceed the predetermined time, the hot rolling plant is notified.
[0024]
That is, as shown in FIG. 5, in step S51, in the entire line power control device, the power amounts P1, P2,... After N minutes from the hot rolling line power control device and the plurality of line power control devices. , Pi, and calculates the total amount P of these power demand prediction values P = P1 + P2 +,..., + Pi. For example, the hot rolling line power control device exceeds the reference value (power limit value) after N minutes. In addition, an alarm is issued when the total amount P of the predicted power demand value exceeds the reference value (the total power amount limit value).
[0025]
Therefore, according to the third embodiment, when a plurality of plants are operating in parallel and monitoring is performed at a higher rank, and the total amount is regulated, the power demand forecast value of a certain plant is set. It is predicted that the power limit value will exceed the power limit value after n minutes, and if the total amount of the power demand forecast value exceeds the total power limit value, this is reported, and the plant operation is changed according to a predetermined rule to change the power operation. It is possible not to exceed the total amount limit value.
[0026]
Embodiment 4 FIG.
In the fourth embodiment, in step 2 shown in FIG. 1 described above, when the lengths of the non-rolled materials at the same rolling schedule are different, the power prediction is performed based on the power consumption of each device by the length correction. Like that.
[0027]
That is, as shown in FIG. 6, in step S61, the rolling schedules in the power amount prediction devices of the respective devices are compared, and if the lengths of the non-rolled materials at the same rolling schedule are different, the actual results of the respective devices are corrected by the length correction. Compare the amounts of power so that the appropriate amount of power can be predicted. As an example, when the actual power amount of each device is represented by P1, P2,..., Pk, the power prediction is performed with the predicted value P being P = (P1 + P2 +... + Pk) / k.
[0028]
Therefore, according to the fourth embodiment, if the same rolling schedule is considered and the predicted transport schedule is considered to be in the same range as the actual transport, the power consumption of each machine is based on the power consumption of each machine. The quantity prediction formula can be learned and replaced with the current power consumption prediction formula.
[0029]
Embodiment 5 FIG.
In the fifth embodiment, when the transfer timing is changed due to the change of the machine or the sensor, the transfer schedule is re-created in steps S1 and S2 shown in FIG. 1 and based on the re-created transfer schedule. Power prediction.
[0030]
That is, as shown in FIG. 7, in step S71, the transport schedule is re-created from the rolling schedule and the position of the sensor in each mechanical power amount prediction device, and the power amount is predicted based on this.
[0031]
Therefore, according to the fifth embodiment, when a machine, a sensor, or the like is changed and various transport timings are changed, the power demand can be automatically predicted.
[0032]
【The invention's effect】
As described above, according to the present invention, the power demand is controlled to the power limit value by predicting the power demand and controlling the extraction pitch of the non-rolled material so that the predicted power demand value does not exceed the power limit value. it can.
[Brief description of the drawings]
FIG. 1 is a flowchart for explaining an extraction pitch control method in a hot rolling plant according to Embodiment 1 of the present invention.
FIG. 2 is a diagram illustrating a hot rolling process including a continuous heating furnace and a hot rolling device in a hot rolling plant.
FIG. 3 is a diagram showing a transport scheduler on a rolling line side in a hot rolling plant.
FIG. 4 is a diagram for explaining Embodiment 2 of the present invention.
FIG. 5 is a diagram for describing Embodiment 3 of the present invention.
FIG. 6 is a diagram for describing Embodiment 4 of the present invention.
FIG. 7 is a diagram for describing Embodiment 5 of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Continuous heating furnace, 2 hot rolling devices, 3 non-rolled materials, S1 (first) power prediction step, S2 (second) power prediction step, S3 (calculation of actual power value of hot rolling plant) , S4 (power demand prediction) step, S5 comparison step, S6 (control) step.

Claims (5)

A first power prediction step of predicting power based on a transfer schedule predicted by a combustion schedule of a hot rolling plant;
A second power prediction step of predicting power based on a transfer schedule predicted by a rolling schedule of a hot rolling plant;
A power demand prediction step of predicting power demand consumed by the entire hot rolling plant based on the power prediction value predicted by the first and second power prediction steps and the actual power value of the hot rolling plant;
A comparison step of comparing a power demand prediction value predicted by the power demand prediction step with a preset power limit value;
A control step of controlling an extraction pitch of a non-rolled material when a predicted power demand value exceeds a power limit value based on a result of the comparison in the comparison step. An extraction pitch control method in the hot rolling plant according to claim 1,
The method of controlling the extraction pitch in a hot rolling plant, wherein the control step reports when the predicted power demand value exceeds the power limit value after a predetermined time. An extraction pitch control method in the hot rolling plant according to claim 1,
The first and second power prediction step, the power demand prediction step, the comparison step and the control step perform prediction and control for each of a plurality of hot rolling plants that are operated in parallel,
It is predicted that the total amount of power demand forecast values for each of the plurality of hot rolling plants exceeds the total power limit value, and that the power demand forecast value in any one of the hot rolling plants exceeds the power limit value after a predetermined time. The method of controlling the extraction pitch in the hot rolling plant, further comprising a notifying step of notifying the hot rolling plant when the operation is performed. An extraction pitch control method in the hot rolling plant according to claim 1,
The second power prediction step includes, when the length of the non-rolled material at the same rolling schedule is different, performing power prediction based on the power consumption of each device by the length correction. An extraction pitch control method in a plant. An extraction pitch control method in the hot rolling plant according to claim 1,
In the first and second power prediction steps, when a transfer timing is changed due to a change in a machine or a sensor, a transfer schedule is re-created, and power is predicted based on the re-created transfer schedule. An extraction pitch control method in a hot rolling plant, characterized in that:

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