JP2023174553A - Method for manufacturing sintered ore and sintering machine - Google Patents

Abstract

To provide a method for optimizing as needed progress of combustion of a carbonaceous material and melting of a sintering raw material, by measuring the progress of the combustion of the carbonaceous material and melting of the sintering raw material in an inserted layer, when manufacturing a sintered ore.SOLUTION: Provided is a method for producing sintered ore, in which sintering raw materials are charged into a circulating pallet 26 to form a charging layer, and an ignition furnace 20 is used to ignite an upper surface layer of the charging layer, air is sucked below the charged layer, a carbonaceous material contained in the sintering raw material is burnt to form a sintered cake, and then the sintered cake is discharged from the ore discharge section to produce sintered ore, wherein an amount of shrinkage or a shrinkage rate of the charge layer after ignition is measured, and one or more of a supply amount of gaseous fuel to the charge layer upper layer, a supply amount of liquid fuel supplied to the upper surface layer of the charging layer, an amount of blended carbonaceous material in the sintering raw material, a thickness of the charging layer, an amount of air sucked, and a moving speed of the pallet are adjusted so that the amount of shrinkage or the shrinkage rate of the charge layer falls within a predetermined range.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method for producing sintered ore, which is a raw material for a blast furnace, and a sintering machine for producing sintered ore.

Sintered ore, which is a raw material for blast furnaces, is generally made up of iron-containing raw materials such as iron ore powder, recovered powder in steel works, and sintered ore unsieved powder, CaO-containing raw materials such as limestone and dolomite, and charcoal such as coke powder and anthracite. It is manufactured using a Dwight Lloyd sintering machine (hereinafter referred to as "sintering machine"), which is an endless moving sintering machine, using a solid fuel as a sintering raw material.

The sintering raw material is charged into an endlessly movable pallet of the sintering machine to form a charging layer. The thickness (height) of the charging layer is approximately 400 to 800 mm. Thereafter, the coal material in this charging layer is ignited by an ignition furnace installed above the charging layer. By suctioning air downward through a wind box installed under the pallet, the carbonaceous material in the charging layer is sequentially combusted. This combustion gradually progresses to the lower layer and forward as the pallet moves. The combustion heat generated at this time burns and melts the sintering raw material, producing a sintered cake. Thereafter, the obtained sintered cake is crushed in an ore discharge section, cooled in a cooler, and sized to become a finished sintered ore.

In the above-mentioned sintering machine, from the viewpoint of improving the strength and yield of sintered ore, it is important to understand and optimize the combustion of carbonaceous material in the charging layer and the progress of melting of the sintering raw material. For example, Patent Document 1 discloses a temperature measuring device that protrudes from the bottom surface of a pallet and includes two or more temperature measuring sections for the purpose of measuring the temperature and sintering rate within the charging layer.

Japanese Patent Application Publication No. 2010-243443

However, the above conventional technology has the following problems.

That is, in Patent Document 1, the temperature inside the charging layer is measured using a temperature measuring device, but for example, if there is excessive air flowing through local voids created within the charging layer or through the boundary between the charging layer and the pallet. Due to disturbance factors such as suction by the sintered material, the temperature within the charging layer decreases regardless of the progress of combustion of the carbonaceous material and melting of the sintering raw material. Therefore, the temperature within the charging layer does not necessarily reflect only the progress of combustion of carbonaceous materials and melting of sintering materials within the charging layer, but rather the progress of combustion of carbonaceous materials and melting of sintering materials. There was a problem that the error was too large to use as an index.

The present invention was made in view of these problems, and its purpose is to monitor the progress of combustion of carbonaceous material and melting of sintered raw materials in the charging layer when producing sintered ore. It is an object of the present invention to provide a method for manufacturing sintered ore and a sintering machine that can accurately measure the progress of combustion of carbonaceous materials and melting of sintering raw materials as necessary.

The gist of the present invention for solving the above problems is as follows.
[1] Charge sintering raw materials into a circulating pallet to form a charge layer, ignite the upper surface layer of the charge layer using an ignition furnace, and suck air from below the charge layer. A method for producing sintered ore, comprising: burning the carbonaceous material contained in the sintering raw material to produce a sintered cake, and then discharging the sintered cake from an ore discharge section to produce sintered ore,
The amount of contraction of the charging layer after ignition is measured, and the amount of gaseous fuel supplied to the upper surface layer of the charging layer and the amount of gaseous fuel supplied to the upper surface layer of the charging layer are adjusted so that the amount of contraction of the charging layer is within a predetermined range. It is characterized by adjusting any one or more of the amount of liquid fuel supplied, the amount of carbon material mixed in the sintering raw material, the thickness of the charged layer, the amount of air suctioned, and the moving speed of the pallet. A method for producing sintered ore.
[2] Charge the sintering raw materials into a circulating pallet to form a charge layer, ignite the upper surface layer of the charge layer using an ignition furnace, and suck air from below the charge layer. A method for producing sintered ore, comprising: burning the carbonaceous material contained in the sintering raw material to produce a sintered cake, and then discharging the sintered cake from an ore discharge section to produce sintered ore,
The contraction speed of the charging layer after ignition is measured, and the amount of gaseous fuel supplied to the upper surface layer of the charging layer and the amount of gaseous fuel supplied to the upper surface layer of the charging layer are adjusted so that the contraction speed of the charging layer is within a predetermined range. It is characterized by adjusting any one or more of the amount of liquid fuel supplied, the amount of carbon material mixed in the sintering raw material, the thickness of the charged layer, the amount of air suctioned, and the moving speed of the pallet. A method for producing sintered ore.
[3] The above measurement is performed at two or more locations in the width direction of the pallet, and the amount of gaseous fuel supplied to the upper surface layer of the charging layer, the amount of liquid fuel supplied to the upper surface layer of the charging layer, and the sintering raw material are measured at two or more locations in the width direction of the pallet. [1] or the above, characterized in that any one or more of the blended amount of carbonaceous material, the thickness of the charging layer, and the suction amount of air are adjusted in the width direction of the pallet. The method for producing sintered ore according to [2].
[4] The method for producing sintered ore according to [3] above, wherein the measurement is performed at two or more locations in the direction of movement of the pallet.
[5] The method for producing sintered ore according to [4] above, wherein the measurement includes measuring the height position of the upper surface of the charging layer.
[6] The method for producing sintered ore according to [5] above, wherein the measurement is performed without contacting the charging layer.
[7] A pallet that circulates, an ore feeding section that charges sintering raw materials into the pallet to form a charging layer, an ignition furnace that ignites the carbon material in the surface layer of the charging layer, and a The sintering machine has a wind box installed below to suck air from below the charging layer, and sinters the sintering raw material using combustion heat of carbonaceous material contained in the sintering raw material. ,
a position measuring device that measures the amount of contraction of the charging layer after ignition, and supplying the amount of gaseous fuel to the upper surface layer of the charging layer so that the amount of contraction of the charging layer is within a predetermined range; Any one or two of the amount of liquid fuel supplied to the upper surface layer of the charging layer, the amount of carbon material mixed in the sintering raw material, the thickness of the charging layer, the amount of air sucked, and the moving speed of the pallet. A sintering machine characterized by having a function to adjust the above.
[8] A pallet that circulates, an ore feeding section that charges sintering raw materials into the pallet to form a charging layer, an ignition furnace that ignites the carbon material in the surface layer of the charging layer, and a The sintering machine has a wind box installed below to suck air from below the charging layer, and sinters the sintering raw material using combustion heat of carbonaceous material contained in the sintering raw material. ,
a position measuring device for measuring the contraction speed of the charging layer after ignition, and supplying the amount of gaseous fuel to the upper surface layer of the charging layer so that the contraction speed of the charging layer is within a predetermined range; Any one or two of the amount of liquid fuel supplied to the upper surface layer of the charging layer, the amount of carbon material blended in the sintering raw material, the thickness of the charging layer, the amount of air sucked, and the moving speed of the pallet. A sintering machine characterized by having a function to adjust the above.
[9] The position measuring device measures two or more locations in the width direction of the pallet, and measures the amount of gaseous fuel supplied to the upper surface layer of the charging layer, the amount of liquid fuel supplied to the upper surface layer of the charging layer, and the amount of liquid fuel supplied to the upper surface layer of the charging layer. The above-mentioned pallet is characterized by having a function of adjusting any one or more of the amount of carbon material in the coagulating material, the thickness of the charging layer, and the amount of air suctioned in the width direction of the pallet. [7] or the sintering machine according to [8] above.
[10] The sintering machine according to [9] above, wherein the position measuring device measures two or more locations in the moving direction of the pallet.
[11] The sintering machine according to [10] above, wherein the position measuring device measures the height position of the upper surface of the charging layer.
[12] The sintering machine according to [11] above, wherein the position measuring device measures without contacting the charged layer.

According to the present invention, since the shrinkage amount or shrinkage rate of the sintering raw material charging layer during sintering is measured, the combustion of carbonaceous material in the charging layer and the progress of melting of the sintering raw material can be accurately measured. The progress of combustion of the carbonaceous material and melting of the sintering raw material can be optimized as necessary.

FIG. 2 is a schematic side view showing an example of a sintering machine used when carrying out the method for manufacturing sintered ore according to the present embodiment. FIG. 2 is a schematic perspective view of the sintering machine shown in FIG. 1. FIG. It is a figure which shows the result of investigating the shrinkage amount of the charge layer during sintering by changing the blending amount of carbon material. FIG. 2 is a diagram showing the results of investigating the yield and TI strength of sintered ore after sintering by changing the amount of shrinkage of the charge layer by changing the blending amount of carbonaceous material. It is a figure which shows the result of investigating the yield and TI strength of sintered ore after sintering by changing the blending amount of carbon material. It is a figure which shows the result of adding 0.4 volume% of natural gas to the area|region with little carbon material, and investigating the shrinkage amount of the charge layer during sintering.

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic side view showing an example of a sintering machine 10 used when carrying out the method for manufacturing sintered ore according to the present embodiment. Further, FIG. 2 is a schematic perspective view of the sintering machine 10 shown in FIG. 1.

Sintered raw materials include iron-containing raw materials such as iron ore powder, recovered powder in steel works, and sintered ore unsieved powder, CaO-containing raw materials such as limestone and dolomite, and carbonaceous materials (solid fuels) such as coke powder and anthracite. The ore is cut out by the roll feeder 14 from the surge hopper 12 provided in the feed section 40 of the sintering machine 10, and charged into an endlessly movable pallet 26 that circulates. An inlay is formed. At this time, the thickness (height) of the charged layer is controlled by adjusting the opening degree of a plurality of dividing gates 16 installed at the bottom of the surge hopper 12 along the width direction of the pallet 26. In this embodiment, the divided gate 16 is divided into eight parts, for example, as shown in FIG. 2, and each divided gate 16 is associated with a gate number (1 ~8) have been allocated.

The charge layer formed on the pallet 26 moves toward the downstream side of the sintering machine 10 together with the pallet 26. A level meter 18 is provided downstream of the dividing gate 16. Eight level meters 18 are provided, the same number as the number of divisions of the division gates 16, and one level meter 18 is provided on the downstream side of each division gate 16. Each level meter 18 is assigned the same number as the division gate number, and each level meter 18 measures the thickness of the charged layer of the division gate 16 assigned the same number. In this embodiment, an ultrasonic level meter is used as the level meter 18.

Each level meter 18 measures the thickness of the charged layer and outputs the measured thickness data to the control device 32. Based on the input thickness data, the control device 32 adjusts the thickness of each dividing gate 16 so that the thickness of the charged layer is equal in the width direction of the pallet 26 or has a specified thickness. Control opening degree.

The upper surface layer of the charging layer is ignited by the ignition furnace 20 installed downstream of the ore feeding section 40. Furthermore, air is sucked by the blower 24, and air in the charging layer is sucked downward through the wind boxes 22 provided in plurality in the longitudinal direction below the pallet 26, and air is introduced into the charging layer from above. The carbonaceous material contained in the sintering raw material is burned. By adjusting the rotational speed of the blower 24, the amount of air sucked can be adjusted.

The sintered raw material is sintered and solidified by the combustion heat generated by burning the carbonaceous material, and becomes a sintered cake, which is a lump of sintered ore. The sintered cake is discharged from the ore discharge section 42. The sintered cake discharged from the ore discharge section 42 cracks in the width direction of the pallet 26 and breaks immediately before falling from the pallet 26.

Thereafter, the sintered cake falls from the ore discharge section 42, is crushed, cooled in a cooler (not shown), and sized to form a sintered product consisting of agglomerates with a particle size of more than 5.0 mm. It becomes a mine.

The control device 32 includes a storage section 34 and a control section 36. The control device 32 is, for example, a general-purpose computer such as a workstation or a personal computer. The storage unit 34 is, for example, an information recording medium such as an update-recordable flash memory, a built-in hard disk or a hard disk connected via a data communication terminal, a memory card, and a read/write device thereof. The storage unit 34 stores in advance a program necessary for implementing the method for manufacturing sintered ore according to the present embodiment, data used during execution of the program, and the like. The control unit 36 is, for example, a CPU, and controls the operation of the sintering machine 10 using programs and data stored in the storage unit 34.

The sintering machine 10 according to the present embodiment includes an injection nozzle (not shown) for supplying gaseous fuel such as natural gas or liquid fuel such as heavy oil from above to the upper surface layer of the charging layer of the pallet 26. , are installed at multiple locations in the width direction of the pallet 26 and at multiple locations in the moving direction of the pallet 26. Moreover, only a selected specific injection nozzle among the plurality of injection nozzles has a function of injecting gaseous fuel or liquid fuel.

In the charging layer after ignition, the temperature rise and melting of the sintering raw material due to combustion of the carbonaceous material progresses from the upper surface to the lower surface of the charging layer. It is known that the charging layer shrinks during this sintering process. Although the shrinkage progresses in all directions, most of the shrinkage is observed as a decrease in the height of the top surface of the charge layer due to the influence of the charge layer's own weight.

The present inventors measured the height position of the top surface of the charged layer while changing the sintering conditions, observed the shrinkage behavior, and obtained the following knowledge.

(1) The shrinkage rate of the charged layer due to sintering increases depending on the amount of carbon material blended, and the amount of carbon material blended is appropriate (4.0 to 4.4 mass%) at which the sintering reaction proceeds in just the right amount. ) reaches 10-20%. When the blended amount of carbonaceous material was increased by 1% by mass in the vicinity of the appropriate blended amount of carbonaceous material, the increase in the shrinkage rate of the charged layer was 7% or more, which was a change of more than 7 times the blended ratio of carbonaceous material. From this, it can be seen that the contribution of volume reduction due to burning of the carbon material itself to the shrinkage of the charging layer is small, and that the sintered layer melts and fills the voids, which makes a large contribution. It is thought that the shrinkage accurately reflects the progress of sintering.

Furthermore, there is a limit to the charging density that can be varied only by adjusting the opening of the dividing gate, and furthermore, the correlation between charging density and shrinkage rate is weak. In other words, it is difficult to control the shrinkage rate of the charged layer within the target range by adjusting the opening degree of the dividing gate. On the other hand, as described above and shown in FIG. 3, which will be described later, there is a strong correlation between the blended amount of carbonaceous material in the raw material and the shrinkage rate of the charged layer, and the variation range of the shrinkage amount is also large. Therefore, the amount of carbonaceous material blended is suitable as a parameter for estimating and controlling the yield and TI strength of finished sintered ore. Adjustment of the amount of carbon material blended is performed by charging the sintering raw material whose blending amount of carbon material has been adjusted to a predetermined value into the surge hopper 12, and charging the sintering raw material into the pallet 26.

(2) It was found that when the amount of carbon material blended is less than the appropriate value, the time from ignition of the charging layer to the start of shrinkage becomes longer. However, the difference in shrinkage speed after the start of shrinkage was little affected by the amount of carbon material blended.

FIG. 3 shows the results of investigating the amount of shrinkage during sintering when the initial height of the charged layer was 600 mm and the amount of carbon material blended was varied in the range of 3.2 to 5.0% by mass. When the blending amount of carbonaceous material is 3.2% by mass, the contraction stagnation period (time from ignition to the start of contraction) is about 19 minutes, whereas when the blending amount of carbonaceous material is 5.0% by mass, In this case, the systolic plateau was approximately 4 minutes. When the amount of carbon material blended was the appropriate value of 4.2% by mass, the contraction stagnation period was about 7 minutes. Moreover, from FIG. 3, it was found that the difference in contraction speed after the start of contraction was minute.

(3) There was a good correlation between the amount of shrinkage of the charged layer during sintering and the yield and TI strength of sintered ore after sintering.

Figure 4 shows that the initial height of the charging layer is 600 mm and the amount of shrinkage of the charging layer is changed by changing the blending amount of carbonaceous material, and the yield and TI strength of the sintered ore after sintering are changed. The results of the investigation are shown below. As shown in FIG. 4, a good correlation was observed between the amount of shrinkage of the charge layer during sintering and the yield and TI strength of sintered ore after sintering. Here, the TI strength is a rotational strength index defined in JIS M 8712:2022.

(4) FIG. 5 shows the results of investigating the yield and TI strength of sintered ore after sintering, with the initial height of the charging layer set to 600 mm and the blended amount of carbonaceous material varied. As shown in FIG. 5, a clear correlation was observed between the blending ratio of carbonaceous material in the sintering raw material and the yield and TI strength of the sintered ore after sintering. Therefore, if it is predicted that the amount of shrinkage of the charging layer during sintering will be small and the yield and TI strength of the sintered ore after sintering will be small, it is necessary to It turns out that it is better to increase the rate. FIG. 5 is a graph in which the amount of shrinkage on the horizontal axis in FIG. 4 is replaced with the blended amount of carbon material.

(5) Even if the blended amount of carbonaceous material is less than the appropriate value and the amount of shrinkage of the charging layer is small, gaseous fuel such as natural gas or liquid fuel such as heavy oil is supplied from above the charging layer to perform sintering. It was found that the amount of shrinkage of the charged layer was increased by accelerating the progress of the reaction. For this reason, if the shrinkage rate of the charge layer during sintering is expected to decrease and the yield and TI strength of the sintered ore after sintering are expected to decrease, use gaseous fuel such as natural gas or heavy oil. It has been found that it is sufficient to add liquid fuel such as from above the charging layer or to increase the amount added.

In Figure 6, the width of the charging layer is 800 mm, the initial height of the charging layer is 400 mm, and the blended amount of carbon material is changed to add 0.4% by volume of natural gas to an area with less carbon material. FIG. 3 is a diagram showing the results of investigating the amount of shrinkage of the charged layer during sintering. It was found that by adding natural gas, the heat deficiency was resolved and the amount of shrinkage of the charging layer could be secured.

Based on the above findings, the sintering machine 10 according to the present embodiment is provided with a position measuring device 28 for measuring the shrinkage amount and shrinkage speed of the charging layer during sintering. The position measuring device 28 is provided on the downstream side of the ignition furnace 20, and the position measuring device 28 measures the position of the upper surface layer of the charging layer coming out of the ignition furnace 20, and controls the measured height position data. Output to device 32.

<Measurement mechanism of position measuring device 28>
Since the object to be measured by the position measuring device 28 is the outer surface of the charging layer, the temperature is lower than the inside of the charging layer, which reaches 1200° C. or higher. Therefore, it is also possible to measure the height position of the upper surface of the charged layer using a contact type weight or a roller with an arm as the position measuring device 28. However, from the viewpoint of durability, the position measuring device 28 is preferably of a non-contact type such as an ultrasonic distance meter.

From the viewpoints of wide measurement field of view and measurement depth, high position resolution, large number of measurement points, and high measurement speed, the position measurement device 28 is preferably a non-contact optical type such as a laser scanner. More preferred. An example of a laser scanner is the 3D scanner ScanStation P series manufactured by Leica, but many of them achieve high-speed scanning through minute movements of galvano mirrors that reflect the laser, and are installed directly above the charging layer. If you try to measure vertically downward, there may be restrictions such as a decrease in measurement accuracy or speed (there are some models that do not have this restriction, but the higher the speed and accuracy of the model, the more restrictions tend to occur) .

In such a case, it is sufficient to install it diagonally above the charged layer, not directly above it, and measure diagonally downward. The smaller the angle of depression (the angle formed by the line of sight to the object below with the horizontal), the fewer limitations such as the reduction in measurement accuracy and speed described above will occur, but the angle of incidence of the laser on the top surface of the charging layer will be smaller. If it is too small, the unevenness of the upper surface of the charged layer may create a blind spot at the measurement position or reduce the accuracy of height measurement, so it is preferable that the depression angle is 15 degrees or more.

When measuring over a wide range in the length direction of the sintering machine 10 (the direction of movement of the pallet 26), the depression angle may be insufficient for a location far from the position measuring device 28. In such a case, a plurality of position measuring devices 28 may be installed.

<Measurement target position of position measuring device 28>
The purpose of the measurement by the position measuring device 28 is to understand the shrinkage of the charging layer due to the sintering reaction, so it is necessary to perform the measurement downstream of the ignition furnace 20 where the sintering reaction starts. In particular, if the measurement is performed near the ore discharge section 42 where the sintering reaction is considered to have completed or its upstream side (for example, within 2 m from the ore discharge section 42), the sintered cake after sintering can be measured. You can understand the progress of the knot.

The measurement is performed further upstream than the ore discharge section 42 or its upstream vicinity (for example, within a range of 10 to 90% of the distance from the ignition furnace 20 to the ore discharge section 42), that is, in the direction of movement of the pallet 26. By measuring at two or more locations and comparing with previous or subsequent measurements, it is possible to determine not only the degree of sintering of the sintered cake after sintering, but also the rate of sintering progress during sintering. can also be understood. Understanding the progress rate of sintering is effective as information for preventing the progress of sintering from progressing too quickly, inhibiting the formation of a calcium ferrite phase or reducing strength.

In addition, by measuring further upstream than the ore discharge section 42 or the vicinity of the upstream side thereof, the degree of sintering progress can be grasped more quickly than when measuring at the ore discharge section 42 or the vicinity of the upstream side thereof. Therefore, operational actions can be taken sooner to optimize the progress of the sintering reaction.

Furthermore, if the position measuring device 28 measures at two or more points in the width direction that is horizontally orthogonal to the moving direction of the pallet 26, even if there is a difference in the progress of sintering in the width direction of the pallet 26, the pallet 26 For example, the degree of progress of sintering can be optimized by adjusting the amount of gaseous fuel or liquid fuel supplied to the upper surface layer of the charging layer.

<Measurement frequency of position measuring device 28>
Regarding the measurement frequency of the position measuring device 28, it is effective even if the measurement frequency is limited to timing when a change in the progress of the sintering reaction is expected, such as when changing the raw material composition, for example, but if the sintering raw material By setting the interval within the time required to pass the entire length of the sintering machine (for example, 20 minutes), and more preferably within 2 minutes, which can be considered as continuous measurement, unexpected compositions and particle sizes of the sintering raw material can be avoided. can respond to changes in

When the control unit 36 acquires the height position data of the top surface of the charging layer from the position measuring device 28, it calculates the amount of shrinkage of the charging layer and the shrinkage speed of the charging layer from the amount of descent of the top surface of the charging layer. If the amount or speed of contraction of the charging layer is not appropriate, the amount of gaseous fuel supplied to the upper surface layer of the charging layer, the amount of liquid fuel supplied to the upper surface layer of the charging layer, and the amount of carbon material mixed in the sintering raw material. , the thickness of the charging layer of sintering raw materials, the amount of air sucked by the blower 24, and the moving speed of the pallet 26 to adjust the amount or speed of contraction of the charging layer. Control within a predetermined range.

The thickness of the charging layer before ignition can be calculated from the opening degree of the dividing gate 16, and also measurement data from the level meter 18 can be used. Furthermore, if a non-contact optical device such as a laser scanner, which has a wide measurement field of view and can measure a large number of measurement points at high speed, is used as the position measuring device 28, it is possible to measure the thickness of the charged layer after ignition and the load before ignition. It is also possible to measure both inlay thicknesses with the same position measuring device.

In addition, when a non-contact optical device such as a laser scanner is used as the position measuring device 28, the upper surface layer from which height position data has been acquired is divided into two or more parts in the width direction of the pallet 26, and the divided area is It is also possible to calculate the average height position at . For example, when the upper surface layer is divided into two in the width direction of the pallet 26, the average height in the near side area and the average height in the back side area are calculated using the center in the width direction as the boundary.

As explained above, according to the present invention, since the amount or shrinkage rate of the sintering raw material charge layer is measured during sintering, the progress of combustion of carbonaceous material and melting of the sintering raw material in the charge layer is measured. The situation can be measured with high precision, and the progress of combustion of carbonaceous materials and melting of sintering raw materials can be optimized as necessary.

[Example 1]
Hereinafter, an example in which sintered ore was manufactured using the same device as the sintering machine 10 shown in FIGS. 1 and 2 will be described. In this example, the amount of natural gas added was adjusted in accordance with the amount of shrinkage of the charging layer of the sintering raw material in two areas (area 1 and area 2) divided in the width direction of the pallet 26 ( Invention example 1). Table 1 shows the results of Inventive Example 1 and the results of Comparative Example 1 in which natural gas was not added.

In this way, by adjusting the amount of natural gas added in each area divided in the width direction of the sintering machine to reduce the deviation in the amount of shrinkage of the sintering raw material charge layer, the sintering yield and product TI strength can be improved. It was confirmed that this can be improved.

[Example 2]
An example in which sintered ore was manufactured using the same device as the sintering machine 10 shown in FIGS. 1 and 2 will be described. In this embodiment, the thickness of the charging layer of the sintering raw material is determined in four regions (region 1, region 2, region 3, and region 4) divided into four areas in the width direction of the pallet 26, depending on the amount of shrinkage of the charging layer of the sintering raw material. (Example 2 of the present invention). Table 2 shows the results of Inventive Example 2 and the results of Comparative Example 2 in which the charging layer thickness was not adjusted.

In this way, by adjusting the charging layer thickness for each area divided in the width direction of the sintering machine and reducing the deviation in the shrinkage amount of the sintering raw material charging layer, the sintering yield and product TI strength can be improved. It was confirmed that this can be improved.

10 Sintering machine 12 Surge hopper 14 Roll feeder 16 Dividing gate 18 Level meter 20 Ignition furnace 22 Wind box 24 Blower 26 Pallet 28 Position measuring device 32 Control device 34 Storage section 36 Control section 40 Ore feeding section 42 Ore discharge section

Claims (12)

Sintering raw materials are charged into a circulating pallet to form a charging layer, the upper surface layer of the charging layer is ignited using an ignition furnace, and air is sucked from below the charging layer to cause the sintering. A method for producing sintered ore, comprising: burning carbonaceous material contained in the sintering raw material to produce a sintered cake, and then discharging the sintered cake from an ore discharge section to produce sintered ore,
The amount of contraction of the charging layer after ignition is measured, and the amount of gaseous fuel supplied to the upper surface layer of the charging layer and the amount of gaseous fuel supplied to the upper surface layer of the charging layer are adjusted so that the amount of contraction of the charging layer is within a predetermined range. It is characterized by adjusting any one or more of the amount of liquid fuel supplied, the amount of carbon material mixed in the sintering raw material, the thickness of the charged layer, the amount of air suctioned, and the moving speed of the pallet. A method for producing sintered ore. Sintering raw materials are charged into a circulating pallet to form a charging layer, the upper surface layer of the charging layer is ignited using an ignition furnace, and air is sucked from below the charging layer to cause the sintering. A method for producing sintered ore, comprising: burning carbonaceous material contained in the sintering raw material to produce a sintered cake, and then discharging the sintered cake from an ore discharge section to produce sintered ore,
The contraction speed of the charging layer after ignition is measured, and the amount of gaseous fuel supplied to the upper surface layer of the charging layer and the amount of gaseous fuel supplied to the upper surface layer of the charging layer are adjusted so that the contraction speed of the charging layer is within a predetermined range. It is characterized by adjusting any one or more of the amount of liquid fuel supplied, the amount of carbon material mixed in the sintering raw material, the thickness of the charged layer, the amount of air suctioned, and the moving speed of the pallet. A method for producing sintered ore. The above measurement is performed at two or more locations in the width direction of the pallet, and the amount of gaseous fuel supplied to the upper surface layer of the charging layer, the amount of liquid fuel supplied to the upper surface layer of the charging layer, and the carbon material of the sintering raw material are measured. According to claim 1 or 2, any one or more of the blending amount, the thickness of the charging layer, and the suction amount of the air are adjusted in the width direction of the pallet. A method for producing sintered ore. 4. The method for producing sintered ore according to claim 3, wherein the measurement is performed at two or more locations in the direction of movement of the pallet. 5. The method for producing sintered ore according to claim 4, wherein the measurement includes measuring the height position of the upper surface of the charging layer. The method for producing sintered ore according to claim 5, wherein the measurement is performed without contacting the charging layer. A pallet that circulates, an ore feeding section that charges sintering raw materials into the pallet to form a charging layer, an ignition furnace that ignites the carbon material on the surface of the charging layer, and is installed below the pallet. A sintering machine that has a wind box that sucks air from below the charging layer, and sinters the sintering raw material using the combustion heat of carbonaceous material contained in the sintering raw material,
a position measuring device that measures the amount of contraction of the charging layer after ignition, and supplying the amount of gaseous fuel to the upper surface layer of the charging layer so that the amount of contraction of the charging layer is within a predetermined range; Any one or two of the amount of liquid fuel supplied to the upper surface layer of the charging layer, the amount of carbon material mixed in the sintering raw material, the thickness of the charging layer, the amount of air sucked, and the moving speed of the pallet. A sintering machine characterized by having a function to adjust the above. A pallet that circulates, an ore feeding section that charges sintering raw materials into the pallet to form a charging layer, an ignition furnace that ignites the carbon material on the surface of the charging layer, and is installed below the pallet. A sintering machine that has a wind box that sucks air from below the charging layer, and sinters the sintering raw material using the combustion heat of carbonaceous material contained in the sintering raw material,
a position measuring device for measuring the contraction speed of the charging layer after ignition, and supplying the amount of gaseous fuel to the upper surface layer of the charging layer so that the contraction speed of the charging layer is within a predetermined range; Any one or two of the amount of liquid fuel supplied to the upper surface layer of the charging layer, the amount of carbon material mixed in the sintering raw material, the thickness of the charging layer, the amount of air sucked, and the moving speed of the pallet. A sintering machine characterized by having a function to adjust the above. The position measuring device measures two or more locations in the width direction of the pallet, and measures the amount of gaseous fuel supplied to the upper surface layer of the charging layer, the amount of liquid fuel supplied to the upper surface layer of the charging layer, and the amount of sintered raw material. Claim 7 or 7, characterized in that it has a function of adjusting any one or more of the amount of carbon material blended, the thickness of the charged layer, and the amount of air sucked in the width direction of the pallet. A sintering machine according to claim 8. The sintering machine according to claim 9, characterized in that the position measuring device measures two or more locations in the direction of movement of the pallet. The sintering machine according to claim 10, wherein the position measuring device measures the height position of the upper surface of the charged layer. The sintering machine according to claim 11, characterized in that the position measuring device measures without contacting the charging layer.

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