JPH02217427A - Method for adjusting sintering speed in width direction of pallet in manufacture of agglomerated ore - Google Patents

Abstract

PURPOSE:To quicken operational action and to prevent lowering of the yield and productivity during operation by arranging plural sensors in width direction of a pallet, measuring noise level and adjusting charging density in the width direction based on the deviation. CONSTITUTION:Plural noise sensors 20 are arranged in the width direction of the pallet 2 above charged layer after an ignition furnace 6 at the fixed interval to measure the noise level. By processing the measured signals of the noise sensors 20 with a computing element 21, the deviation is obtd. and displayed on CRT 22. Based on the obtd. depth information in the combustion zone 9, apex angle 26 of dispersing plate 25 is adjusted to make uniform the depth of the combustion zone 9, that is, sintering speed is made uniform.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for adjusting the sintering speed in the barrel width direction in the production of agglomerated ore.

[゛Conventional technology] Agglomerate ore is generally produced as follows.

A solvent such as powdered iron ore, serpentine, and return ore of 4 mm or less generated during the crushing and sizing process of agglomerate ore are blended, mixed in a mixer, granulated in a pelletizer, and then in a pelletizer or drum mixer. Powdered coke on the surface of this granule,
Secondary granulation is performed to coat solid fuel such as char or pulverized coal to produce green pellets of 5 to 10 mm, and the green pellets are charged into an endless moving grate type sintering machine and sintered. Thereafter, the sintered body is crushed to a predetermined size, cooled, and sized to produce agglomerated ore of 4 mm or more.

In the above process, the green pellet is sintered in the sintering machine as follows. As shown in FIG. 3, green pellets are charged from a charging belt conveyor 1 to a pallet 2 that moves toward an ore discharge section 7.

The charged raw pellets are leveled into a predetermined charge layer by a cut plate 3, passed through a drying oven 5, and ignited on the surface of the charge layer by an ignition furnace 6. On the other hand, the combustion zone 9 generated by the 8 ignition, in which air and gas are sucked downward from the surface of the charging layer through the wind box 4, moves downward through the charging layer as the pallet moves due to the downward suction, and moves downward through the charging layer to the discharge area. At point A in step 7, sintering of the entire height of the charging layer is completed. The sintered bodies of the post-fired pellets are discharged from the ore discharge section 7 to the next process. In FIG. 0, 8 is a raw pellet layer, and 10 is a sintered layer of the pellets.

In the sintering process, it is important to control the sintering end point in the machine length direction and to equalize the sintering speed in the pallet width direction from the viewpoint of preventing a decrease in yield and production rate, that is, stabilizing the operation. Conventionally, uniformity of the sintering speed in the width direction is achieved by quantifying the widthwise difference in wind box temperature or the widthwise difference in the thickness of the ember layer in the ore discharge section 7 (
(by image processing, etc.) to adjust the charging density in the width direction.

[Problems to be Solved by the Invention] The conventional method using wind box temperature has errors due to air leakage, and deviations are caused by abnormal sintering (parts where the sintering speed in the width direction is uneven) due to It cannot be detected until reaching the box, that is, a position near the ore discharge area, and deviations in the thickness of the ember layer at the ore discharge area cannot be detected until the abnormal sintering area reaches the ore discharge area. In other words, the conventional method In this case, the occurrence of abnormal sintering cannot be detected until 30 to 40 minutes have passed after charging the pellet, and the operational action (adjustment of charging density in the width direction) is delayed accordingly. Therefore, there is a problem that the yield and production rate decrease during this time.

[Means for Solving the Problems] This invention attempts to solve the above-mentioned problems by providing a plurality of noise sensors at intervals above the charging layer after the ignition furnace and in the width direction of the pallet. sintering speed in the pallet width direction in agglomerate ore production, characterized in that the noise level is measured in the pallet width direction, the deviation of the noise level in the pallet width direction is determined, and the charging density in the width direction is adjusted based on the deviation. This is an adjustment method.

[The presence of abnormal sintering in the width direction of the working copallet can be detected by multiple noise sensors installed after the ignition furnace, so operational action can be taken 25 to 30 minutes earlier than with conventional methods (
(adjustment of charging density).

[Example] Examples of the present invention will be described below based on the drawings. 1st
The figure shows a device for detecting deviation of a combustion zone in the pallet width direction for carrying out the method of the present invention. The pellets loaded onto pallets on the charging belt conveyor are leveled into a predetermined charging layer by a cut plate, passed through a drying oven, and are ignited on the surface of the charging layer in an ignition furnace 6, resulting in zero ignition. The combustion zone 9 travels downward through the charge bed as the pallet 2 moves due to downward suction. If the suction air volume is uneven in the width direction of the pallet, the rate of descent of the combustion zone 9 will be uneven in this process, and as shown in the cross section of the charging layer in FIG. In Figure 0, where the depths up to 9 are uneven, the depth in the center is small and the sintering speed is slow, and the area near the pallet side wall is deep (the sintering speed is fast). In the combustion zone 9, a part of the pellets bursts, and at that time, a bursting sound is emitted.When the noise level of the bursting sound is measured with a noise sensor installed on the surface of the charging layer, it is found that the combustion zone It has been found that the attenuation is approximately proportional to the depth of the water.The present invention has been made by taking advantage of this fact.

20 is a noise sensor, 5 to 10 CII from the charging layer surface.
At the top, two rows of 5g each are provided at regular intervals in the width direction of the pallet. The distance between the noise sensor 20 and the outlet end of the ignition furnace needs to be such a distance that the deviation of the combustion zone depth in the width direction can be clearly distinguished. It should be noted that since the plosive sound of a barrette has a specific frequency band (for example, 250 to 570 Hz), measurement accuracy can be further improved if the noise level is measured through a bandpass filter for that band. 21 is a computing unit that data-processes the measurement signal of the noise sensor 20; 23;
is a CRT. Then, the measurement signals from the plurality of noise sensors 20 are graphed or displayed in the calculator 21 and then displayed on the CRT 22 as a graph or a table.

Figure 2 is a perspective view showing a fractional plate that adjusts the charging layer density in the width direction of the charging layer. It is something to do. ′
(This is done by adjusting the height of the pile of raw pellets formed near the side wall of the pallet to adjust the amount of segregation of large raw pellets to the central part.) Based on the depth information of the combustion zone 9 in the pallet width direction, the dispersion plate 25
The charging density in the width direction is adjusted by adjusting the apex angle 26 of the combustion zone, thereby making the depth of the combustion zone uniform, that is, the sintering rate. In the example of FIG. 1, since the sintering speed near the pallet side wall is high, the apex angle 26 of the dispersion plate can be opened by a predetermined distance Jl to increase the charging density near the pallet side wall. There is no shortage of heat in the layer, and it is possible to prevent the occurrence of unburned parts.

[Effects of the Invention] According to the present invention, the charging density in the pallet width direction can be adjusted by
Since the process can be carried out 25 to 30 minutes earlier than in the conventional method, it is possible to prevent a decrease in yield and production rate during this time.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a device for detecting the deviation of the combustion zone in the width direction of the pallet for carrying out the method of the present invention, and Fig. 2 is a perspective view showing a dispersion plate for adjusting the charging density in the width direction of the charging layer. Figure, 3rd
The figure is a diagram illustrating the sintering state of the charge layer of the chemical pellet. 1.Charging belt conveyor, 2.Barrette, 6.
...Ignition furnace, 8...Raw pellets, 9...Combustion zone, 1
0... Sintered layer, 12... Charging layer surface, 20... Noise sensor, 21... Arithmetic unit, 22... CRT, 2
5... Dispersion plate, 26... Apex angle.

Claims (1)

[Claims] A plurality of noise sensors are installed at intervals above the charging layer after the ignition furnace and in the width direction of the pallet to measure the noise level, determine the deviation of the noise level in the width direction of the pallet, and based on that deviation, A method for adjusting sintering speed in the pallet width direction in agglomerate ore production, which is characterized by adjusting charging density.