KR20020046070A - Sinter machine charging material segregation improve apparatus and the improve method by using wind force - Google Patents

Abstract

PURPOSE: An apparatus and a method for improving segregation of charging materials of a sintering machine using wind force are provided to improve quality of sintered ore of a sintering upper layer and increase productivity by separately charging raw materials and coke breeze having fine particle sizes into the sintering upper layer. CONSTITUTION: In an apparatus in which segregation of the charging materials is improved by dropping charging materials(2) in a storage hopper(1) of a sintering machine through a drum feeder(3) and a slopping chute(4), and using an air ejection means, the apparatus for improving segregation of the charging materials of the sintering machine using wind force comprises a second slopping chute(5) which is installed at the rear of the slopping chute(4) with spaced apart therefrom in a certain distance; and a classified material amount sensor(13) which is installed at the lower part of the slopping chute(4). In a method in which segregation of the charging materials is improved by dropping charging materials(2) in a storage hopper(1) of a sintering machine through a drum feeder(3) and a slopping chute(4), and using an air ejection means, the method for improving segregation of the charging materials of the sintering machine using wind force comprises the processes of collecting fine powder, coke breeze and subsidiary raw materials having low specific gravities through the second slopping chute(5) installed at the rear of the slopping chute(4) by ejecting air through the air ejection means installed between the drum feeder(3) and the slopping chute(4); and controlling an air ejection amount and a classified material amount through the classified material amount sensor(13) which is installed at the lower part of the slopping chute(4).

Description

Sinter machine charging material segregation improve apparatus and the improve method by using wind force}

The present invention relates to an apparatus and a method for improving segregation of charged raw material segregation using wind power, in particular, in the process of charging the sintering raw material into a sintering material, the raw materials of the powdered coke and fine particles, which are fuels required for the sintering reaction using the wind, The present invention relates to a segregator charging raw material segregation improving device and a method for improving the sintered ore quality and recovery rate by strengthening the sintering reaction of the upper part of the sintered layer by segregating the upper part.

In general, the raw material loading of the sintering machine is a very important factor that determines the sintering operation. The basic principle of the charging is segregation of the raw materials for sintering raw materials.

The segregation of the components targets limestone and silica sand, which are secondary raw materials that serve as binders when sintering fuel coke and iron ore. The sintering reaction combusts coke mixed in the sintering raw material and consists of the heat of combustion. By the ignition furnace provided on the sintered layer, the powdered coke in the surface layer portion is ignited and combusted toward the lower layer portion.

Therefore, if the mixing ratio of the powdered coke is the same as the upper layer and the lower layer, the heat necessary for the sintering reaction is insufficient and the lower layer is in an excessive state. have. In addition, when segregating the limestone and the silica sand as the secondary raw material in the upper layer, the strength of the sintered ore can be improved by improving the sintered ore binding strength of the upper layer having insufficient heat.

In addition, the particle size segregation is a method of improving the air permeability of the sintered raw material layer by charging a raw material having a large particle size in the lower sintered layer and a raw material having a small particle size in the upper portion. When the raw material having a fine particle size is loaded in the lower layer, the air permeability is lowered as well as the airflow imbalance in the width direction, which leads to problems of productivity loss and quality of sintered ore.

Many types of sintering charging devices and charging methods have been developed for the purpose of reinforcing important segregation charging as described above. Among them, a method has been developed for classifying charged raw materials using wind power and charging them to segregate in proper form.

In Japanese Patent Application Laid-Open No. H10-281652 shown in FIG. 3A, an air ejection nozzle of an air injection means is installed at a lower portion of a slipping chute to inject air in a direction opposite to a charged raw material sliding down an inclined surface of the slipping chute. Due to the injected air, the descent rate of the powdered coke and the subsidiary material having a smaller particle size or smaller specific gravity than iron ore is lowered, and thus a raw material having a large particle size or a small specific gravity is charged into the upper layer.

However, the sintered raw material which slides down the slope chute through the drum feeder is increased in speed by gravity acceleration. Since the moving speed of the sintered raw material in the lower part of the slipping chute is about 3 to 5 m / sec, spraying high-speed air in the direction opposite to the moving direction of the raw material is pre-assembled by adding water and quicklime. It is not only limited to the air spraying speed, but also the amount of charge is so large that only the surface of the raw material that slides the slope chute is classified so that the classification effect by the wind and the segregation charging effect can be obtained sufficiently. Can't.

A typical 4m wide sintering machine that produces 13,000 tonnes, for example, is difficult to produce, as the sliding chute slides down at a thickness of 6 to 10 cm and a speed of 3 to 5 m / sec.

In addition, in Japanese Patent Application Publication No. 4-6775 shown in FIG. 3B, the air is blown through the gas jet nozzle of the air jetting means by cutting the lower and lower ends of the slitting chute in the width direction. Considering that the layer thickness of is 6 ~ 10cm and the moving speed is 3 ~ 5m / sec, there was a big problem in classifying the fine powder and powdered coke with the cut holes of the slinging chute.

The present invention has been made to solve the above-mentioned problems of the prior art, by classifying the fine raw material and the powdered coke separately and separately separated and charged to the sintered raw material layer to improve the quality of the sintered ore of the upper sintered layer and the air permeability improved The purpose of the present invention is to provide a segregator charging raw material segregation improving device and a method for improving productivity using wind power.

Figure 1a and Figure 1b is a side view showing an example of the segregator charging raw material segregation improving device using a conventional wind power, respectively.

Figure 2 is a perspective view showing a segregator charging raw material segregation improving device using the wind power in accordance with the present invention.

Figure 3 is a side view showing the segregator charging raw material segregation improving device using the wind power in accordance with the present invention.

<Explanation of symbols for main parts of drawing>

1: Storage Hopper 2: Raw Materials

3: drum feeder 4: slinging chute

5: second slope chute 6: sintering machine bogie

7: charged material amount detector 11: air injection nozzle head

12: Air spray nozzle 13: Classified material amount detector

In order to achieve the above object, the charging material in the sintering machine storage hopper falls through the drum feeder and the slitting chute, and the air injection means is used to improve segregation of the charging raw material. There is provided an apparatus for improving segregation of charged raw materials using wind power, characterized in that second slitting chutes are provided at intervals, and a classifying raw material amount detector is installed below the slitting chute.

In the present invention, the air injection means is characterized in that it is installed between the lower portion of the drum feeder and the upper portion of the sleeping chute.

In the present invention, the upper end of the second slope chute is characterized in that it is vertically extended to collect the raw material classified by the wind.

Further, according to the present invention, in the method of charging the raw material in the sinter storage hopper falls through the drum feeder and the slitting chute and improves segregation of the charged raw material by using an air spraying means, between the drum feeder and the slipping chute Air is injected through the air spraying means to collect fine powder, powdered coke, and subsidiary material with a second slope chute installed in the rear of the slipping chute. Provided is a method for improving segregator loading raw material segregation using wind power, characterized in that for controlling the injection amount of the air and the amount of classified raw material through the instrument.

In the present invention, the upper end of the second slope chute is characterized in that it is vertically extended to collect the raw material classified by the wind.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

In general, sintered raw materials are mainly mixed with iron ore, limestone, silica sand, powdered coke, sintered semi-reflective, and the particle size and specific gravity thereof are different as shown in Table 1 below.

Particle Size by Type of Sintered Raw Material ironstone Limestone Bunk coke Quartz sand Sintered Glow An apparent specific gravity (g / cm ³⁾ 2.2 to 2.5 1.5 0.8 1.5 1.8 Particle size (mm) 8 or less 5 or less 3 or less 1 or less 5 or less

When classifying sintered raw materials using wind power, powder coke, which is lighter than iron ore, is expected to be the most effective. Limestone and silica sand also have a lower proportion than iron ore, so wind classification is possible.

1 and 2 show an embodiment of the segregator charging raw material segregation improving device using the wind power according to the present invention, with reference to this air injection means is installed between the drum feeder and the slipping chute, the slope A second slope chute is installed at a predetermined interval behind the chute, and a classification raw material amount detector is installed below the slope chute.

The air injection means receives air of a proper pressure from a blower (not shown) installed in the outside through the pipe through the slit-type air injection nozzle 12 installed in the lower portion of the drum feeder (3) in the drum feeder (3) Air is injected from the time when the raw material starts to fall. Fine powder, powdered coke, and subsidiary materials having a small particle size or a specific gravity are classified into a second slitting chute 5 to be described later to distinguish them from raw materials such as iron ore having a large particle size and a large specific gravity.

Since the air injection means is classified from the point of time when the charging raw material 2 is cut out from the storage hopper 1 by the air injection, the classification action occurs over the entire surface at right angles to the dropping direction of the raw material. It is more effective than the method of classifying with wind at the bottom of the slope chute.

The sintered raw material which slides down the slitting chute 4 through the drum feeder 3 increases in speed by gravity acceleration (free fall speed = (2x gravity acceleration x height)) ^½} . That is, at the time of cutting out, the speed in the vertical direction to the ground is zero, and the raw material speed is very slow compared to the speed at the bottom of the chute until the drum feeder 3 passes through the front surface of the air spray nozzle 12. In addition, since the air is injected in the space in which the charged raw material 2 free-falls, the classification effect is superior to the wind classification of the sintered raw material that slides the above-mentioned conventional sliding chute. This is the same principle as the method of separating blackfire from grain by using wind in autumn.

The installation position of the air injection means is a portion between the lower portion of the drum feeder 3 and the upper portion of the slitting chute 4, that is, the smallest distance between the drum feeder 3 and the slipping chute 4, i. Since the cross-sectional area is the smallest part of the flow path, it is the most effective position to secure the flow rate of air for raw material classification.

The second slope chute (5) is installed at a suitable interval on the back of the slipping chute (4), the fine particle fraction classified through the air spraying means or powdered coke and low raw material (limestone, silica) having a low specific gravity The raw material mainly contained is collected and deposited on top of the sintered raw material layer. Here, the upper end of the second slope chute 5 is vertically extended to collect the raw material classified by the wind by sedimentation by gravity.

If the cross-sectional area of the extension surface of the second slope chute (5) and the space formed by the drum feeder (3) is wider than the cross-sectional area of the space formed with the top of the slope chute (4), that is, the air injection means is classified Since the flow rate of the raw material is reduced, sedimentation by gravity occurs. In particular, the sintered raw material is added to about 7% of water in advance and rotated in a container such as a drum mixer to assemble, so there is no dust scattering even if it is classified by wind, so it can be used without environmental pollution. .

The classification raw material loading detector 13 has the same shape as a general sintered charge raw material detection detector 7 and is composed of two contact sensing sensors, a single rod and a long rod, and is installed at the lower and middle ends of the rear side of the slitting chute 4. It is. The principle of operation is to control the amount of raw material to be classified by adjusting the air injection amount so that the long rod is always in contact with, and the single rod is always in contact with the classification raw material deposited on the lower front surface of the second slope chute (5).

The air injection amount is controlled by the flow control valve installed in the air supply pipe for the air injection means receives the contact signal of the long rod and the single rod. The control logic decreases the amount of air discharged by a certain amount when the single rod and the long rod are in contact at the same time, and gradually reduces the raw material's classification. On the contrary, when the single rod and the long rod are not in contact with the raw material, the air discharge is gradually increased. Gradually increase. In addition, when the rod is in contact and the rod is not in contact, the amount of air injection is to be kept the same.

As described above, according to the present invention, the segregation of the raw material required for charging the sintered raw material can be properly controlled as necessary, so that the components and the particle size of the upper part of the sintered raw material layer can be easily controlled.

In addition, by loading the sorted raw material into the upper layer of the sintering machine through a separate slipping chute can maximize the segregation charging effect, it is possible to improve the maintainability of the raw material sorting device.

Claims (5)

In the apparatus for charging the raw material in the sinter storage hopper falls through the drum feeder and the slipping chute and improve the segregation of the charged raw material by using the air injection means, A second raw material chute is installed at a predetermined interval behind the slipping chute, and a classification raw material detector is installed in the lower portion of the slipping chute sintering machine charged raw material segregation improving device using the wind power. The apparatus of claim 1, wherein the air injection means is installed between a lower portion of the drum feeder and an upper portion of the slitting chute. The apparatus of claim 1, wherein the upper end of the second slitting chute is vertically extended to collect raw materials classified by wind power. In the method of charging the raw material in the sinter storage hopper falls through the drum feeder and the slipping chute and improve the segregation of the charged raw material by using the air spray means, Air is injected through the air spraying means installed between the drum feeder and the slinging chute to collect fine powder, powdered coke, and subsidiary material having a low specific gravity through a second slinging chute installed at the rear of the slinging chute. A method for improving segregation of charged raw material segregation using wind power, characterized in that for controlling the injection amount of the air and the amount of the classification raw material through a classification raw material detection detector installed in the lower part of the chute. 5. The method of claim 4, wherein the upper end of the second slitting chute is vertically extended to collect raw materials classified by wind power.