JPS60211021A - Method for controlling sintering of ore to be sintered - Google Patents

Abstract

PURPOSE:To make the quality of sintered ore uniform by detecting the grain size distribution of starting materials for sintering dropped onto a sintering pallet from a hopper and by regulating the degree of opening of the partition gate of the hopper and the angle of a shoot so as to make the grain size distribution uniform in the lateral direction. CONSTITUTION:Starting materials 4 for sintering dropped onto a pallet 3 from a surge hopper 2 through the partition gate 6 and a sloping shoot 7 have a varying grain size distribution in the vertical direction. This state is photographed with a high-speed TV camera, and the grain size distribution in the vertical and lateral directions is detected with a picture processor 9. The degree of opening of the gate 6 and the angle of the shoot 7 are regulated according to a signal from the processor 9 so as to make the grain size distribution of the dropped starting materials 4 uniform in the lateral direction and uniformly vary in the vertical direction. By this control the quality of sintered ore is made uniform.

Description

[Detailed Description of the Invention] The present invention relates to a method for controlling sintering of sintered ore, and in detail,
The present invention relates to a sintering control method for sintered ore, which controls the sintering of sintered ore raw materials by finely determining the particle size distribution within the sintered ore raw materials.

When producing sintered ore, which is a raw material for iron manufacturing, using a sintering machine, the particle size distribution of the raw material within the pallet of the sintering machine is a factor that affects the properties of the sintered ore product. In other words, particle size segregation in the height direction of the raw material layer, where the coarse particles of the raw material are unevenly distributed in the lower layer of the raw material layer in the pallet and the fine particles are unevenly distributed in the upper layer of the raw material layer, affects the air permeability within the raw material and the firing process of the raw material. It greatly influences the thermal history and controls the quality of sintered ore, such as strength, reduction pulverizability, and reduction rate. Also, is the coarse particle content and fine particle content of the raw material A? Particle size segregation in the width direction of the raw material layer, which is unevenly distributed in the width direction of the let, causes uneven firing of the raw material, lowers the general quality of sintered ore, lowers the yield rate, and has a negative impact on operations.

For this reason, conventional methods have been to measure the particle size distribution of raw materials in pallets, examine particle size segregation, and control the sintering of sintered ore.

Conventionally, this particle size distribution has been measured as follows.

(1) Stop the sintering machine, stop the progress of the gret and the charging of raw materials, and have a person enter the raw material charging section and sample the raw material charged into the gret and check its particle size. Measure to determine particle size segregation. (2) Raw materials are loaded onto the pallet.
Before loading, the Sanzolar is placed on a pallet, and when the material is loaded onto the pallet, the Sanzolar is charged with the raw material.Then, between the raw material charging section and the ignition furnace, the Sanzolar is lifted up from the pallet and recovered by a crane. The particle size of the raw material in the sunglass is measured to examine particle size segregation in the height direction of the raw material layer.

However, method (1) (a) stops the sintering machine, which disrupts operations and reduces production efficiency, (a) requires labor for sampling, and (e) requires drying of the sampled raw material.
Since the particle size is measured by separating the particles with a sieve, it takes time and effort to measure the particle size, and the disadvantage is that the particle size can only be measured once a day. In addition, method (2) has the following problems: (a) there are few sampling points in the raw material layer, and (b) particle size measurement is the same as method (1), so it can only be measured once a day. There are drawbacks.

Therefore, in the conventional sintering control method, the particle size distribution is not considered in detail, which makes it difficult to perform good sintering control.

In view of the above-mentioned current situation, the present invention provides a method for controlling sintering of sintered ore, which controls sintering by carefully determining the particle size distribution in the sintered ore raw materials. The charging process of the sintered ore raw material charged into the pallet of the sintering machine was imaged by a high-speed television camera, and the particle size distribution of the raw material within the pallet was measured. Based on the distribution, raw material charging control elements such as the opening degree of the division P-) below the surge hopper and the angle of the sloping chute below the surge hopper are changed to adjust the particle size distribution of the raw material within the pallet. Thus, the present invention is characterized in that the sintering of the raw material is controlled.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings. 1st
The figure is an explanatory diagram for explaining the sintering control method of sintered ore according to the present invention, and FIG. 2 is a view taken along the line A--A in FIG. 1.

In FIGS. 1 and 2, 1 is a high-speed television camera for photographing the charging process of sintered ore raw material 4 cut out from the surge hopper 2 of the sintering machine and put into the /'P tuklet 3;
Is the high-speed television camera located in front of the surge hopper 2? Three units are installed in the width direction of the ret 3, and the widthwise side surfaces of the raw material layer inside the ret 3 are kept in view.

The raw material 4 is cut out from the division f-) 6 at the bottom of the serge hollow groove 2 by the roll feeder 5, and falls along the sloping chute 7, after which the raw material 4 in the pallet 3 advances in the direction of the arrow. It falls along the surface of the layer and is deposited in the pallet 3.

When the raw material 4 falls along the surface of the raw material layer, it slides down, so the falling speed becomes slower, but still 0.2 to 1
The speed is about m1sec. Therefore, even if an ordinary television camera images the raw material 4 falling on the surface of the raw material layer, the shape and size of the particles of the raw material 4 cannot be seen. Therefore, the charging process of the raw material 4 falling along the surface of the raw material layer in the pallet 3 is imaged, and the raw material 4 in the pallet 3 is
In order to measure the particle size distribution of
It is necessary to use In addition, in FIG. 1, 8 is a cut-off plate that smooths the upper part of the raw material 4 charged into the pallet 3.

An image signal obtained by imaging the charging process of the raw material 4 by the high-speed television camera 1 is image-processed by the image processing device 9, and thereby, for example, the image shown in FIG. 3 (a) is obtained.

The particle size distribution of the raw material 4 within the pallet 3 can be seen as shown in (b). Here, FIG. 3(a) shows the particle size distribution in the height direction of the raw material layer, and the distribution bands a to d indicate that the average particle size (M, S,) of the raw material 4 is a: 3 cm or more. , b=3~
1■, c: 1 to 0.5 W1d: o, 5 or less. In addition, in Fig. 3(b), the raw material layer is divided into 3 parts in the height direction and 4 parts in the width direction, and the raw material layer is made into 15 blocks, and the average particle size of each block is calculated as follows: It is something that

From such an average particle size X, ~XI5, for example, the raw material upper layer (XI + I4 y Xy + X+o,
), raw material middle layer (I2゜xs l xg j XIt
+ XI4) s Raw material lower layer (I31 xa l Xl
l + Also, for example, the average particle size of the upper layer, middle layer, and lower layer XI
For lX2 lX3, (Xs - XI)/x2
and index the segregation in the height direction of the raw material layer.

Once the particle size distribution of the raw material in the pallet has been determined as described above, it is compared with the optimum particle size distribution obtained through operational analysis of sinter production, and the action means (raw material charging control elements) are changed. Sintering is controlled by adjusting the raw material to be charged into the slot with the optimum particle size distribution. To adjust the particle size distribution in the height direction of the raw material layer,
The angle U of the sloping chute, the relative position of the sloping shoe and the roll feeder, the rotation speed of the roll feeder, etc. are changed. To adjust the particle size distribution in the width direction of the raw material layer,
This is uniform control that eliminates segregation in the width direction, but this
This is done by adjusting the opening degree of the divided darts. In addition, cleaning the sloping chute is also effective because if the sloping chute raw material sticks, it causes segregation in the width direction.

It goes without saying that the measured particle size distribution data is accumulated and used to determine the optimum particle size distribution through operational analysis.

The method for controlling sintering of sintered ore according to the invention is configured as described above, and therefore has the following effects. (1) The raw material charging process is imaged with a high-speed television camera, and A? Since the particle size distribution of the raw material within the let is determined, sintering can be controlled by knowing the particle size distribution in detail over the entire height and width directions of the raw material layer. (2) Since the particle size distribution can be measured once every few minutes instead of once a day as in the conventional method, sintering can be controlled without variations due to sampling. (
3) Since it is possible to see how the segregation situation is changing over time, control actions can be taken immediately. (4) It does not require manpower or effort to determine the particle size distribution.

(5) Since the particle size distribution is finely tuned for sintering control, good sintering control can be achieved.

[Brief explanation of the drawing]

FIG. 2 is a diagram showing the particle size distribution of raw materials obtained with a high-speed television camera used in the method. In the drawings, l...High-speed television camera, 2...Thursohatsuno+-, 3...Pallet, 4...
・I material, 5... Roll feeder, 6... Division case, 7... Sloping chute, 8... Cutoff plate, 9... Image processing device. Applicant Nippon Steel Tube Co., Ltd. Agent Natsuo Shioya (and 2 others) Figure 1 Figure 3 (a) Direction (b) Direction nη

Claims (1)

[Claims] The charging process of the sintered ore raw material charged from the surge hopper into the pallet of the sintering machine was imaged by a high-speed television camera, and the particle size distribution of the raw material in the /flet was measured. The A? A method for controlling the sintering of sintered ore, the method comprising adjusting the particle size distribution of the raw material in a sintered ore, and thus controlling the sintering of the raw material.