KR20050010264A - Method for manufacturing sintered ore using the baking tempature on the wind box - Google Patents

Abstract

PURPOSE: To provide a method for measuring sintering temperature on wind boxes changed according to grain size of coke injected as a sintering fuel and controlling injection quantity of coke and thickness of hearth layer to manufacture sintered ore with superior quality and improve sintering productivity. CONSTITUTION: The method for manufacturing sintered ore using sintering temperature on wind boxes comprises a step of preparing a blended raw material by mixing sintering raw material with fuel after discharging sintering raw material and fuel from a raw material storage bin(10) and a fuel storage bin(20) according to a certain ratio; a step of piling up hearth layer on a sinter machine(120) to a certain thickness by discharging hearth layer from a hearth layer hopper(100); a step of piling up the blended raw material on the hearth layer piled up on the sinter machine; a step of measuring sintering temperature at a point corresponding to 60% of effective grate distance on wind boxes(121) installed under the sinter machine during the sintering process; a step of judging whether grain size of fuel injected is within a standard value range or not based on the measured sintering temperature; and a step of controlling ratio of the fuel discharged and thickness of the hearth layer piled up according to the judgement.

Description

Method for manufacturing sintered ore using sintering temperature on windbox {Method for manufacturing sintered ore using the baking tempature on the wind box}

The present invention relates to a method of manufacturing a sintered ore using the sintering temperature on the windbox, and more particularly, to measure the sintering temperature on the windbox, which changes according to the particle size of the coke introduced into the sintered fuel, and accordingly the amount of coke input and the thickness of the upper light. The present invention relates to a method for making the sintered ore more efficiently by controlling the light.

Referring to Figure 1 describes a general sintered ore manufacturing process as follows. A raw material storage bin 10 for storing various iron ore as a main raw material and silica, serpentine, limestone, etc., and a fuel storage bin 20 for storing coke, sintered fuel, etc. (if anthracite coal is used as sintered fuel) There is also, but most of the coke is used because the coke will be described below as an example). A predetermined amount of raw materials and fuel are cut out by the quantitative extruder 30 provided at the lower exit side of the storage bins 10 and 20 and supplied to the mixer 60 by the mixing traveling belt conveyor 40. At this time, the semi-light is supplied to the mixer 60 from the semi-light storage hopper 50 as well as the raw and fuel supplied from the bins 10 and 20.

The raw fuel and semi-glossy supplied according to a certain ratio are mixed in the mixer 60, and granulated by adding 6.5-7% water. In this mixing and assembling process, the sintered raw material is in a pseudo-granular state in which fine particles are attached to coarse nuclei particles and coarse. The pseudo-granulated material is defined as a blended raw material. The blended raw material is granulated into the surge hopper 90 by the surge hopper-line belt conveyor 70 and the reciprocating conveyor 80 and through the drum feeder 95 installed at the lower exit side of the surge hopper 90. On the other hand, the upper light storage hopper 100 installed at the rear of the surge hopper 90 receives a portion of the blended raw material from the mixer 60 and the blended raw material than the surge hopper 90 First, the upper light is formed during sintering by feeding the sintering machine 120. The reason for loading the upper light is to prevent the sintered ore from being fused to the great bar by separating the sintered ore and the great bar of the lower part of the sintering machine. The blended raw material supplied from the surge hopper 90 and the upper light storage hopper 100 to the sinterer 120 is moved along the sinterer 120 to ignite its upper layer in the ignition furnace 110. The ignited heat comes down to the lower layer by sintering the main exhaust fan 123 installed through the box 121 and the chamber 122 to sinter the entire blended raw material. At this time, since the blended raw material moves along the sintering machine 120, it is sintered by the downward suction and cooled by contact with cold air from the top. When the sintering and cooling processes are completed, the sintered ore is finally generated.

The generated sintered ore is crushed by the primary crusher 124 and then classified by the hot screen 125 according to its diameter. That is, the semi-glossy with a diameter of 5 mm or less is conveyed to the semi-light storage hopper 50 and resupplied to the mixer 60, and the sintered ore with a diameter of 5 mm or more is transferred to the cooler 126, cooled, and then fixed by the cutting feeder 127. Is conveyed to the secondary crusher 128 at a rate of. In the secondary crusher 128, the sintered ore having a diameter of 50 mm or more is crushed to make a size suitable for charging in the blast furnace. The sintered ore is 15 mm or more in diameter and the second screen 129 by the first screen 129-1. -2) are classified into 10 mm or more in diameter and 5 mm or more in diameter by the third screen 129-3, and finally stored in the sintered ore storage hopper 130.

Flame front speed in the sintering process is an important factor in the production of sintered ore, the sintered productivity can be obtained as well as the sintered productivity of the excellent quality according to the flame advance speed. The flame propagation speed is also changed depending on the conditions of the raw materials and the air permeability in the sintered layer, but the particle size of coke introduced as fuel has an absolute effect, which can be seen in Table 1 comparing the sintering productivity according to the particle size of the coke.

Table 1

Coke Average Particle Size (mm) Sintered Productivity (T / D / m ² ) Sinter Recovery Rate (%) Sintered ore strength and particle size burglar(%) 10mm or less Fine particle size (1.2 mm or less) 31.2 to 31.7 77.6-78.1 92.6-93.1 25.0 to 25.5 31.5 to 32.0 77.8 ~ 78.3 92.7-93.3 26.0 to 26.5 31.0 to 31.5 78.0-78.5 92.9 to 93.4 25.5-26.0 31.3 to 31.8 77.5-78.0 93.0-93.5 26.5-27.0 Normal particle size (1.3 to 1.7 mm) 34.2-34.7 77.2-77.7 92.0-92.5 26.0 to 26.5 34.0 to 34.5 77.5-78.0 92.4-92.9 26.4 to 26.9 34.0 to 34.5 77.3 to 78.5 92.5-93.0 27.0-27.5 34.5-35.0 77.0-77.5 92.3-92.8 27.3 to 27.8 Coarse particle size (more than 1.8mm) 30.2-30.7 75.2-75.7 89.6-90.1 32.2-32.7 31.5 to 31.7 75.0-75.5 89.7 to 90.2 33.0-33.5 30.5 to 31.0 75.4-75.9 90.0-90.5 32.0 to 32.5 31.5 to 32.0 75.5-76.0 89.5-90.0 34.5-35.0

As shown in Table 1, when the average particle size of the coke is fine to 1.2mm or less, the combustion is too early during the sintering process so that the quality is maintained due to the short firing time, but the sintering productivity is 2.5 ~ 3.0 T / D / m ² is reduced.

On the other hand, when the coke's average particle size is coarse than 1.8mm, the time for complete combustion is increased and it is locally overmelted, thereby dissolving the upper light and fusion to the grate bar. The molten light must be removed through a cooling sprinkler. Accordingly, the sintering productivity is reduced by 1.8 to 2.0 T / D / m ² , the recovery rate is reduced by 1.8% or more, and the ratio of the sintered ore having a strength of a certain reference value or more that can be used in the blast furnace is reduced by 1.5% or more, and the lower particle size of 10 mm or less The quality of sintered ore falls, such as 7 to 8% or more of sintered ore decreases.

As such, the particle size of coke introduced into the sintering fuel needs to be thoroughly managed because it is the most important factor that determines the firing time and affects the quality and sintering productivity of the sintered ore. Often the coke's particle size deviates from the baseline. When the coke having a particle size exceeding the standard value is introduced into the sintering machine, the above sintering productivity is lowered. However, in the related art, the change in the coke particle size has to be determined based on the phenomenon that the sintered ore is distributed after the sintering process is completed. After one hour or more of coke has been introduced, changes in coke particle size can be identified, and considering the time required to take action, normal operation was possible after at least two hours had elapsed. As described above, according to the conventional method for producing sintered ore, there is a problem in that the action according to the change of the coke particle size is not made quickly and the quality and the sintering productivity of the sintered ore are lowered.

The present invention has been proposed to solve the above problems, and it is necessary for normal operation such as adjusting the coke ratio or adjusting the thickness of the upper light by grasping the particle size change of the fuel coke as a change in the sintering temperature on the windbox. The goal is to create a way to make the action faster.

According to the present invention, it is possible to quickly compensate for the decrease in sintering productivity due to the change of the coke particle size, to produce not only excellent sintered ore, but also to improve sintering productivity.

1 is a general sintered ore manufacturing process diagram.

Figure 2 is a graph showing the sintering temperature change on the windbox according to the coke particle size.

Figure 3 is a graph showing the sintering temperature change on the 16th wind box and coke particle size distribution of 5mm or more.

Figure 4 is a block diagram for performing a sintered ore manufacturing method according to the present invention.

5 shows a thermometer arrangement on a windbox according to the invention.

6 is a flow chart of a sintered ore manufacturing method according to the present invention.

※ Explanation of symbols about main part of drawing ※

10: raw material storage bin 20: fuel storage bin

60: mixer 90: surge hopper

100: upper light hopper 110: igniter

120: sintering machine 121: windbox

130: sintered ore storage hopper 140: control unit

150: cooling sprinkler

In order to achieve the above object, a sintered ore manufacturing method using a sintering temperature on a wind box according to the present invention comprises the steps of cutting the sintered raw material and fuel from a raw material storage bin and a fuel storage bin according to a predetermined ratio and then mixing them into a blended raw material. ; Extracting the upper light from the upper light hopper and loading the upper light on the sintering machine to a predetermined thickness; Loading the blended raw material on top light loaded on the sintering machine; Measuring the sintering temperature at a point corresponding to 60% of the effective image distance in the windbox installed at the bottom of the sintering machine during the sintering process; Determining whether the particle size of the fuel injected based on the measured sintering temperature is within a reference value; And adjusting the ratio of the fuel to be cut out and the thickness of the upper light to be loaded according to the determination.

The determination of whether or not the particle size of the injected fuel falls within the reference value is to determine that the particle size of the fuel falls within 1.3 to 1.7 mm, which is a standard value for normal operation when the measured sintering temperature is 90 to 100 ° C.

When the particle size of the fuel according to the sintering temperature is lower than the reference value, the ratio of the fuel to be cut is increased by 0.2 to 0.4%. When the particle size of the fuel according to the sintering temperature exceeds the reference value, the ratio of the fuel to be cut is 0.2. -0.4% reduction and the thickness of the above-mentioned upper light is increased by 10-50mm. In addition, when the particle size of the fuel according to the sintering temperature exceeds the reference value, the sintered ore fused on the sintering machine is removed by a cooling water distributor provided at the point where the sintered ore is distributed.

Hereinafter, a sintered ore manufacturing method according to the present invention will be described in detail with reference to the accompanying drawings.

The present invention measures the sintering temperature at a predetermined point on the windbox based on the fact that the sintering temperature changes in the sintering process varies depending on the particle size of the coke, the sintered fuel, and the particle size of the coke introduced based on the measured sintering temperature After determining that the coke's granularity is outside the standard for normal operation, it is a basic technical idea to take necessary measures for normal operation.

Figure 2 is a graph showing the sintering temperature change in the sintering process according to the particle size of the coke. The x-axis represents a total of 30 windboxes installed in the lower part of the sintering machine, and the windbox closest to the surge hopper is numbered 1 and the windbox located farthest is numbered 30 where the compounding material is first loaded. The y-axis represents the sintering temperature on windbox 16 measured during the sintering process. As can be seen in Figure 2, the blended raw material exhibits a constant sintering temperature regardless of the coke size until the compound material passes through the installation point of the wind box No. 15 in the sintering process, but from the wind box No. 16 according to the particle size of the coke The range of change is very different. When the distance from the first windbox to the 30th windbox is referred to as the effective image distance, the 16th windbox corresponds to about 60% of the effective image distance. Looking at the change of the sintering temperature, (A) is a case where coke with a fine particle size of 1.2mm or less is added, the combustion time is too fast during the sintering process and the firing time is shortened, so the sintering temperature is the lowest, (C) In the case of coke with coarse particle size of 1.8mm or more, the complete burning time is long, so it is locally overmelted and the sintering temperature is the highest. On the other hand, when coke having a normal particle size of 1.3 to 1.7 mm is added as shown in (b), the change in sintering temperature located in the middle of (a) and (c) is shown.

Therefore, the particle size of the coke injected can be determined by measuring the sintering temperature. At this time, it is preferable that the point for measuring the sintering temperature is set to No. 16 wind box corresponding to 60% of the effective image distance. Because, according to the present invention, the sintered ore manufacturing method according to the present invention is to determine the particle size of the input coke quickly, and if the particle size is out of the standard value for normal operation, it is necessary to quickly take necessary measures to achieve the normal operation, the particle size of the coke This is because measuring the sintering temperature in wind box No. 16, the first difference in sintering temperature variation, can be used to determine the coke's particle size.

As a result of several experiments, the average particle size of coke was found to be correlated with the fraction of coke having a particle size of 5mm or more, and when the fraction of coke having a particle size of 5mm or more was about 5-8%, the average particle size of coke was Normal operation is possible at 1.3 ~ 1.7mm. The relationship between the coke fraction having a particle size of 5 mm or more and the sintering temperature measured in the wind box No. 16 are mutually proportional as shown in FIG. 3, and the number 16 of the coke fraction having a particle size of 5 mm or more is 5-8%. It can be seen that the sintering temperature in the windbox is 90 to 100 ° C.

Based on the experimental results, the sintering temperature on wind box No. 16, coke fraction with a particle size of 5 mm or more, and the average particle size of coke are summarized, and the coke particle size determined based on the measured sintering temperature is outside the standard value for normal operation. As a measure to be taken in the case of the coke ratio control, the thickness of the upper light is as follows Table 2 below.

[Table 2]

Sintering temperature (℃) on wind box No. 16 Coke granularity Adjusting ratio of coke input (%) Upper light thickness control (mm) 5 mm or more (%) Average particle size (mm) 85 or less 1 or less 0.9 or less 0.4 increase 40-50 86-89 2 to 4 1.0 to 1.2 0.2 increase 40-50 90-100 5 to 8 1.3 to 1.7 - 40-50 101-105 8 to 13 1.8 to 2.3 0.2 reduction 60 to 80 106 or more 14 or more 2.4 or more 0.2 reduction 80-100

As shown in Table 2, when the sintering temperature measured in the wind box No. 16 is 90 to 100 ° C., coke grain size (1.3 to 1.7 mm) that can be operated normally is maintained, so no further action is required. When it becomes 89 degrees C or less, since the particle size of coke is so fine that a combustion rate falls, the ratio of the coke injected will increase by 0.2 to 0.4%. However, the thickness of the upper light is maintained at 40 to 50mm, because the thickness is the minimum thickness to prevent the sintered ore is fused to the sintering machine. On the other hand, when the sintering temperature is 101 ℃ or more, the coke grain size is coarse and over-baked, and the sintered ore is fused to the great bar, so that the ratio of the coke introduced is reduced 0.2 to 0.4% and the thickness of the upper light to prevent the fusion phenomenon. Increase 10 to 50 mm. Moreover, although not shown in the said table | surface, the operation | movement which removes the sintered ore fused to the great bar of a sintering machine by a cooling water sprayer is also performed.

Based on the above description, the sintered ore manufacturing method according to the present invention will be described in more detail with reference to FIGS. 4 to 6.

First, a blended raw material is produced by cutting raw materials such as iron ore and fuel such as coke from the raw material storage bin 10 and the fuel storage bin 20 at a predetermined ratio. Thereafter, the upper light cut out from the upper light hopper 100 is loaded on the sintering machine 120 with a thickness of 40 to 50 mm, and the mixed compound material is loaded on the upper light loaded on the sintering machine 120. .

While the blended raw material is transported along the sinterer 120, the upper part is ignited by the igniter 110 and the heat is sucked downward by the wind box 121 installed at the lower part of the sinterer 120. Sintered. At this time, by measuring the sintering temperature on the wind box 121, more precisely, the wind box No. 16 corresponding to 60% of the effective image distance and transmits it to the control unit 140, the control unit measures the measured sintering The particle size of the injected fuel is determined based on the temperature.

The thermometer arrangement on the windbox 16 for the measurement of the sintering temperature is made as shown in FIG. That is, the wind box 121 is installed in the lower portion of the sintering machine 120 is loaded with the upper light 101 and the compounding material 91, and consists of the suction chute 121a, 121b divided into two. The thermometer may include a first thermometer 122 installed at a lower center of the windbox 121, and second and third thermometers 123 and 124 installed inside the lower portions of the two suction chutes 121a and 121b at a predetermined distance from the first thermometer. ), And the fourth and fifth thermometers 125 and 126 installed on the upper outer side of the two suction chutes 121a and 121b at the same interval as the width of the sintering machine 120 to adjust the overall sintering temperature of the wind box 121. Arranged to make accurate measurements. In actual operation, if the temperature is measured outside the temperature range of 90 ~ 100 ℃ possible to normal operation in two of the five thermometers can be configured to take the necessary measures for normal operation.

When the measured sintering temperature is less than 90 ° C, the proportion of the fuel cut out in the preparation of the blended raw material is increased by 0.2 to 0.4%. This is to increase the combustion rate of the fuel to increase the sintering productivity and to improve the quality of the sintered ore. On the other hand, when the measured sintering temperature exceeds 100 ℃ the ratio of the fuel cut out in the step of making the blended raw material is reduced by 0.2 to 0.4% to reduce the combustion rate, the upper light is sintered on the sintering machine 120 In the step of stacking on, the thickness of the upper light 101 is increased by 10 to 50 mm to prevent the overmelted sintered ore from being fused to the great bar of the sintering machine. In addition, the sintering efficiency in the post process is increased by removing the sintered ore which is already fused to the great bar through the cooling water sprayer 150 in the process of light distribution after the sintering is completed. The fusion light removal operation by the cooling sprinkler 150 is about 15 minutes in actual operation.

As described above, according to the present invention, the particle size of the injected fuel is determined by using the sintering temperature on the windbox during the sintering process, and when the particle size deviates from the standard value, the fuel is fed back in real time to quickly take necessary measures for normal operation. It allows for a more effective sintering process.

According to the sintered ore manufacturing method according to the present invention as described above, by quickly checking whether the particle size of the sintered fuel injected by using the sintering temperature on the wind box is out of the standard value for normal operation, and taking necessary measures, This allows the normal operation to be performed not only to increase the sintering productivity but also to improve the quality of the sintered ore.

Claims (4)

Cutting the sintered raw material and fuel from the raw material storage bin 10 and the fuel storage bin 20 according to a predetermined ratio and then mixing them to form a blended raw material; Extracting the upper light from the upper light hopper 100 and loading the light on the sintering machine 120 in a predetermined thickness; Loading the blended raw material on the upper light loaded on the sintering machine (120); Measuring the sintering temperature at a point corresponding to 60% of the effective image distance in the wind box 121 installed below the sintering machine 120 during the sintering process; Determining whether the particle size of the fuel injected based on the measured sintering temperature is within a reference value; And adjusting the ratio of the fuel to be cut out and the thickness of the upper light to be loaded according to the determination. The method of claim 1, wherein the determining of the particle size of the injected fuel falls within a reference value is that the particle size of the fuel falls within 1.3 to 1.7 mm, which is a standard value for normal operation when the measured sintering temperature is 90 to 100 ° C. Sintered ore manufacturing method using the sintering temperature on the wind box, characterized in that the judging. According to claim 1 or 2, when the particle size of the fuel according to the sintering temperature is less than the reference value, the ratio of the fuel cut out is increased by 0.2 to 0.4%, and the particle size of the fuel according to the sintering temperature exceeds the reference value In the case of the sintered ore manufacturing method using the sintering temperature on the wind box, characterized in that the ratio of the fuel cut out is reduced by 0.2 to 0.4% and the thickness of the loaded upper light 101 is increased by 10 to 50mm. The method of claim 3, wherein when the particle size of the fuel according to the sintering temperature exceeds the reference value, the sintered ore fused on the sintering machine 120 is removed by the cooling water sprayer 150 provided at the point where the sintered ore is distributed. Sintered ore manufacturing method using the sintering temperature on the wind box.