JPH04301039A - Sintering machine raw material charging control device - Google Patents

Abstract

PURPOSE:To provide the title device for uniformizing unevenness of permeability of sintering raw material layer developed in longitudinal direction of the machine due to landslipping phenomenon. CONSTITUTION:The device is composed of a TV camera 21 for taking picture of landslip developing part in charging part of the sintering raw material into pallet 4 in the sintering machine and a computing element 25 obtaining the landslipping quantity (x) and slipping period (n) by treating picture signal of the TV camera and corrected number of revolutions R0 of roll feeder from the actual number of revolutions R1 of roll feeder and delay time (d) and transferring the signal to driving part of the roll feeder. As the landslipping phenomenon is reduced and the permeability of sintering raw material layer in the longitudinal direction of machine is uniformized, the yield and the quality of sintered ore are improved.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sintering raw material charging control device for making the air permeability of a sintering raw material layer uniform.

0002

[Prior Art] A sintering method for sintering raw materials involves mixing iron ore powder of approximately 10 mm or less with coke powder and lime powder of appropriate particle size.
The coke on the surface of the sintering raw material layer charged into the sintering pallet is ignited, the coke is combusted while sucking air downward, and the iron ore is sintered with the combustion heat. Since sintering progresses through the combustion of coke, the permeability of the sintering bed or the sintering raw material layer is an important operational factor.

When charging the sintering raw material into the pallet through the charging chute, the sintering raw material flows down the slope of the sintering raw material layer formed on the pallet. The flow of the raw material is not uniform, and an avalanche phenomenon occurs in which the sintered raw material accumulates in the lower to middle portions of the sintered raw material layer and then collapses and flows down. To avoid this avalanche phenomenon, the material is charged by providing a sieve surface with a large number of strips arranged at intervals downward from the lower end of the charging chute. (For example, JP-A-62-284020
It has been observed that the frequency of occurrence of avalanche phenomena decreases.

0004

[Problem to be Solved by the Invention] When an avalanche phenomenon occurs, the permeability of the sintering raw material layer in the longitudinal direction of the sintering machine where the avalanche occurs and where the avalanche does not occur becomes uneven, causing uneven firing and decreasing the yield. decreases. SUMMARY OF THE INVENTION An object of the present invention is to provide a sintering raw material charging control device for equalizing nonuniform air permeability of a sintering raw material layer in the longitudinal direction due to an avalanche phenomenon.

[0005]

[Means for Solving the Problems] The present invention aims to achieve the above-mentioned objects, and includes a television camera for photographing the avalanche-generating part of the charging part of the sintering raw material to the sintering machine pallet;
An image processor that processes the image signal of the television camera to determine the avalanche amount and avalanche period, and a roll feeder drive unit that calculates the corrected rotation speed of the roll feeder from the avalanche amount, avalanche period, current roll feeder rotation speed, and delay time. This is a sintering machine raw material charging control device consisting of a computing unit that sends signals.

[0006]

[Effect] Periodic fluctuations in the current roll feeder rotation speed with a phase difference of 1/2 of the avalanche period, taking into consideration the amount of avalanche, avalanche period, and delay time (time for the sintered raw material to slide down the sloping chute). By adding this and controlling the rotation speed of the roll feeder, the avalanche phenomenon can be reduced.

[0007]

EXAMPLES Examples of the present invention will be described in detail below. FIG. 1 is an explanatory diagram of the apparatus of the present invention. The sintered raw material in the ore feed hopper 1 is cut out by a roll feeder 2, slides through a charging chute 3, and is charged into a pallet 4 that moves toward an ignition furnace 5. It is loaded onto pallet 4. The upper part of the sintering raw material charged into the pallet 4 is flattened by a cut plate 6 provided on the back surface of the charging chute 3 to form a sintering raw material layer 7. The sintered raw material discharged from the charging chute 3 flows down in a layered manner along the slope 8 of the sintered raw material layer 7 formed at the lower part of the charging chute. This flow layer is called a flowing layer 9. This flow is not a uniform flow, and sometimes the speed of the flow slows down, and as shown by the broken line, it flows down to form a retention layer 10 in which a retention portion is formed in the lower to middle portions. When the lower to middle stagnation parts grow to a certain size, they flow down like an avalanche due to their weight (this phenomenon is called an avalanche phenomenon), and flow down again in the state of the flowing layer 9. In this way, the flow conditions of the falling layer 9 and the retention layer 10 are repeated at regular intervals.

As a result of observing the avalanche phenomenon, it was found that when the rotation speed of the roll feeder is constant, the avalanche amount x (height of the retention section immediately before the drop) and the avalanche period n (time from the flowing layer state to the drop of the retention section) sec ) was found to be a constant value. Various investigations were conducted to investigate the effect of periodically varying the rotational speed of the roll feeder on avalanche phenomena. As a result, it was found that giving an amplitude proportional to the avalanche amount x and a sinusoidal variation of the avalanche period n is effective in reducing the avalanche phenomenon, and that an amplitude of a few percent of the roll feeder rotation speed is sufficient. It was also found that adding a phase difference of 1/2 of the avalanche period was even more effective.

In FIG. 1, an image signal from a television camera 21 installed to photograph the retention portion of the retention layer 10 is transmitted to an image processor 22, and the avalanche amount x and the avalanche period n of the retention layer 10 are determined by image processing. is required. Arithmetic unit 2
3, the corrected rotation speed R0 is calculated from the avalanche amount x, the avalanche period n, and the current rotation speed R1 of the roll feeder using equation 1.
is determined, and the rotation speed of the roll feeder 2 is controlled via the drive motor 24. Note that the average value of the avalanche amount x, the avalanche period n, and the rotation speed R1 of the roll feeder over a predetermined period of time (for example, 60 seconds) is used, and the change in the avalanche amount x, etc.
) is carried out every time.

0010

[Math 1]

In Equation 1, G, k, and d are constants determined by the charging device of the sintering machine. Avalanche amount x = 20 cm, avalanche period n = 2 sec, current roll feeder rotation speed R1 = 3.0 rpm, delay time d = 1.2 sec,
The control equation (Equation 1) when the avalanche correction constant k=0.0075 rpm/cm and the control gain G=0.5 is R0=3
．． 0+0.075Sin π(t-0.2).

When the device of the present invention was attached to a certain sintering machine to produce sintered ore, the avalanche phenomenon was reduced, the yield increased by 0.3%, and the cold strength (TI) decreased compared to the conventional device. )
rose by 0.6%.

[0013]

[Effects of the Invention] Since the present invention is constructed as described above, the avalanche phenomenon that occurs when sintering raw materials are charged into pallets is reduced, and the permeability of the sintering raw material layer in the longitudinal direction is made uniform. This has the effect of improving yield and quality of sintered ore.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the apparatus of the present invention.

[Explanation of symbols]

2 Roll feeder 4 Palette 7 Sintering raw material layer 9 Lower layer 10 Retention layer 21 TV camera 22 Image processor 23 Arithmetic unit 24 Drive motor

Claims (1)

[Claims] Claim 1: A television camera for photographing the avalanche-generating part of the sintering raw material charging section to the sintering machine pallet, an image processor for processing the image signal of the television camera to obtain the avalanche amount and avalanche period, and an avalanche. A sintering machine raw material charging control device consisting of a computing unit that determines the corrected rotation speed of the roll feeder from the amount, avalanche period, current rotation speed of the roll feeder, and delay time and sends a signal to the roll feeder drive unit.