JPS6033169B2 - Heating furnace control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for controlling a heating furnace that accurately determines the in-furnace time of the material when charging the material and performs stable and good control.

Material-side parameters that greatly affect control accuracy in heating furnace control include dimensions, which are physical values of the material (material thickness, plate thickness, plate length) and various thermal constants (specific heat, thermal conductivity, etc.). There is a time period during which the material stays in the furnace while being transported within the furnace (hereinafter referred to as furnace residence time).

In-furnace time is the time interval between the time the material is charged into the furnace and the time it is extracted, and is affected by the movement of all slabs that have been charged before the material but have not yet been extracted.

This invention has been made in view of the above-mentioned circumstances, and includes a first calculation device for calculating a rolling schedule after the material is extracted from the heating furnace when charging the material into the heating furnace; a second calculation for predicting the extraction pitch of the two materials using the rolling schedule determined by the first calculation device and the already determined rolling schedule of the material charged immediately before the material; equipped with a device,
By predicting the in-furnace time of the above materials based on the predicted extraction pitch of all the materials that have already been charged into the heating furnace, stable and good control can be achieved by accurately grasping the in-furnace time. The purpose of the present invention is to provide a heating furnace control device that makes it possible.

Hereinafter, the configuration of a heating furnace control device in an embodiment of the present invention will be explained based on FIG. 1.

In the figure, reference numeral 1 denotes a first calculation device that calculates the rolling schedule after the material is extracted from the heating furnace.

2 is based on the rolling schedule of the material determined by the first calculation device 1 and the rolling schedule of other materials charged immediately before this material stored in the storage device 3.
4 is a second calculation device that predicts and calculates the extraction pitch after this material and the material charged just before are baked;
A calculation device that predicts and calculates the furnace residence time of all the materials charged in the heating furnace 6 based on each adjacent extraction pitch calculated by the calculation device 2 of the heating furnace 6;
Reference numeral 5 denotes a control device that sets the flow rate of fuel supplied to the heating furnace 6 and the furnace temperature based on the in-furnace time predicted and calculated by the calculation device 4.

The method of determining the rolling schedule based on the information on the material to be charged is usually called schedule calculation, but it involves determining the conveyance speed, rolling speed, rolling pattern, and cooling pattern after extraction from the heating furnace. It is called a rolling schedule. Figure 2 shows how to determine the extraction pitch of the most recently charged material and the charged material based on the rolling schedule of the charged material and the rolling schedule of the material charged immediately before. . In other words, if the rolling schedule after the material charged immediately before the village is extracted is known in advance, the movement of the tail end of the material on the rolling line is given by curve A in Figure 2. It will be done. Furthermore, if the rolling schedule after the material is extracted is known in advance, the movement of the leading edge of the material on the rolling line is also given. On the other hand, constraints are placed on the time interval between the tail end of the preceding material and the leading edge of the succeeding material (hereinafter referred to as gap time) at each checkpoint on the rolling line, such as the entry side of the rough mill, the exit side of the rough mill, the entry side of the finishing mill, and the coiler. exists,
On the entry side of the coarse mill, the gap time must be at least 100 mm larger. In exactly the same way, the gap times are 7G2 and 7G for the coarse mill outlet, finishing mill inlet, and coiler, respectively.
It has a constraint that it must be larger than 03 and 7G4. Therefore, when the time at which the preceding material is extracted is set to zero as shown by curve C in Fig. 2, the tail end of the preceding material and the leading edge of the succeeding material at each checkpoint are If the gap times are respectively i・, ga2, ↑3, and ↑4, then i>keGI(
i knee, 2, 3, 4) ...,. ．． 1, which satisfies the constraint conditions, but this extraction pitch cannot be said to be optimal, and from the viewpoint of productivity, the extraction pitch can be further shortened.

That is, in the second arithmetic unit 2, as shown by curve B in FIG. 2, the gap time at each checkpoint is 7i>iGi (i knee, 2, 3, 4). ．． ．． ．． ，
．． The minimum extraction pitch t that satisfies the constraint condition 2 is determined.

In this way, the extraction pitch of adjacent materials for all materials contained in the heating furnace can be determined in advance.

Therefore, ti is the extraction pitch of the i-1st material and the i-th material from the heating furnace extraction side (however, the 0th material is the last extracted material), and there are n in the heating furnace. If the number of materials to be charged is n+1*, the furnace time X of the material to be charged now (n+1st material) is n+1*.・・・・・・
・3X=Z ti−Δt can be obtained.

However, Δt indicates the elapsed time after the 0th material was extracted. The accurate predicted heating furnace in-furnace time of the bagged material obtained in this way is input to the heating furnace control, thereby improving productivity and making it possible to set the optimum fuel flow rate or furnace temperature.

As described above, according to the present invention, when charging material into a heating furnace, the rolling schedule obtained by the first calculation device and the rolling schedule already calculated after the material is extracted from the heating furnace are determined. a second calculation device that predicts the extraction pitch of the two materials using the rolling schedule of the material charged immediately before the material that has been charged, and a second calculation device that predicts the extraction pitch of the two materials using the rolling schedule of the material charged immediately before the material that has been charged, and By predicting the in-furnace time of the above-mentioned material based on the predicted extraction pitch of the material, it is possible to provide a heating furnace control device that accurately grasps the in-furnace time and enables stable and good control. can.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing a schematic configuration of a heating furnace control device in an embodiment of the present invention, and Fig. 2 shows a rolling schedule for charging material and a rolling schedule for other materials charged immediately before. It is a curve diagram for determining the extraction pitch of each material. In the figure, 1 and 2 are first and second computing devices, 3 is a storage device, 4 is a computing device, 5 is a control device, and 6 is a heating furnace. Figure 1 Figure 2

Claims (1)

[Claims] 1. When charging the material into the heating furnace, a first calculation device that calculates the rolling schedule after the material is extracted from the heating furnace; and a first calculation device that calculates the rolling schedule after the material is extracted from the heating furnace; 2 above using the rolling schedule of the material charged immediately before the required above material
and a second arithmetic unit for predicting the extraction pitch of one material, and predicting the in-furnace time of the material based on the predicted extraction pitch of all the materials already charged in the heating furnace. A heating furnace control device featuring: