JP5494512B2 - Method of charging sintered raw materials - Google Patents

Description

The present invention relates to a method for charging a sintered raw material for improving the quality and productivity of a sintered ore produced by a Dwytroid (DL) type sintering machine.

As a method for producing sintered ore using iron ore such as powdered ore, coagulants such as powdered coke, and lime such as quick lime as a sintering material, a part or all of the sintering material is appropriately granulated. After granulating into a granulated product with a diameter and inserting it into a sintering pallet (hereinafter also referred to simply as a pallet), the surface layer of this sintering raw material is ignited and the agglomerated material is sucked down while sucking air toward the bottom of the pallet. It is generally performed to oxidize and sinter iron ore (powder ore) using heat generated during oxidation.
As described above, when the sintering raw material is charged into the sintering pallet, the following problems are encountered when the uniform particle size distribution is given in the height (depth) direction of the charged sintering raw material layer. .

The surface layer portion of the sintering raw material layer is cooled by the sucked outside air and the temperature rise is insufficient. In addition, since a gas at a higher temperature passes through the lower part of the sintering raw material layer than the upper sintering raw material layer such as the surface layer part, the airflow resistance is higher than that of the upper sintering raw material layer, and the amount of air sucked (ventilated) Amount) decreases.
Accordingly, sintering of the sintering raw material does not proceed due to the above-described insufficient temperature rise or a decrease in the air flow rate, which may cause a decrease in the yield of the sintered ore or reduce the production of the sintered ore. There was no cause.
For this reason, in the surface layer portion of the sintering material layer, the particle size of the sintering material is reduced to increase the surface area that receives heat, thereby promoting the sintering. It is desirable to increase the particle size and improve air permeability. This countermeasure is also called segregation charging, and various techniques have been proposed in the past in order to obtain a predetermined particle size segregation.

For example, Patent Document 1 includes a plurality of bars extending along the flow direction of the sintering raw material on the downstream side of the charging chute of the sintering raw material, and viewed from the side of the adjacent bars in plan view. A bar screen that has a wider vertical space as it goes downstream is provided, and the sintering raw material is charged to the pallet while classifying the sintering raw material supplied by the drum feeder with the bar screen via the charging chute. An entry method has been proposed.
By this method, the above-described segregation charging of the sintered raw material can be realized, and as a result, the yield of the sintered ore can be increased, and if the yield is substantially constant, the amount of firing can be increased. . Therefore, the productivity (ton / day / m ² ) of the sintered ore obtained by the product of the calcining amount (ton / day / m ² ) and the yield (%) can be greatly improved.
Therefore, in order to further improve the productivity of sintered ore, a technique shown in Patent Document 2 has been proposed in which the method described in Patent Document 1 is improved.

In Patent Document 2, in order to make the descent of the red tropics (sintering progress) uniform in the pallet width direction, for example, the air permeability is detected by measuring the passing wind speed at a plurality of positions in the pallet width direction, and this detection result It is described that the degree of particle size segregation in the pallet width direction is adjusted according to the above. In addition, as a method of adjusting the degree of particle size segregation, adjustment of the interval between adjacent bars (strips) (adjustment of the moving distance in the vertical direction) and adjustment of the opening angle of the bar are described.
By this method, the sintering quality in the pallet width direction can be made constant, and the yield of the low yield portion in the pallet width direction can be improved.

Japanese Unexamined Patent Publication No. 63-190125 Japanese Patent Laid-Open No. 64-36731

However, the method described in Patent Document 2 is an improvement in the relative yield of sintered ore as to whether or not the sintering quality in the pallet width direction can be made constant, and a higher yield cannot be realized. Also, the yield of sintered ore may decrease in time series even if the conditions such as the composition of the sintering raw material are the same, and this decrease makes the sintering quality in the pallet width direction constant by the method described above. However, it could not be improved.

The present invention has been made in view of such circumstances, and using a bar screen having a plurality of bars extending along the flow direction of the sintering raw material, the yield of the sintered ore decreases in time series. It aims at providing the charging method of the sintering raw material which can suppress a phenomenon and can implement | achieve a high yield.

The method for charging a sintered material according to the first aspect of the present invention comprises the sintering material disposed at a downstream side of the charging chute of the sintering material with an interval in the width direction of the charging chute. A bar screen is provided with a plurality of bars extending along the flow-down direction, and with a downstream space between the bars adjacent to each other in the vertical direction as viewed from the side larger than the upstream space, and is supplied by a drum feeder. In the charging method of the sintered raw material, the sintered raw material is charged into the pallet while being classified by the bar screen via the charging chute.
On the condition that the supply amount of the sintering raw material supplied to the pallet per unit width and unit time of the pallet is increased to a preset amount or more, the bars adjacent to each other in the vertical direction in the side view The interval on the downstream side is made wider than the interval before the supply amount of the sintering raw material is increased.

The method for charging a sintered material according to the second aspect of the present invention is arranged on the downstream side of the charging chute of the sintered material, and is arranged with an interval in the width direction of the charging chute. A bar screen is provided with a plurality of bars extending along the flow-down direction, and with a downstream space between the bars adjacent to each other in the vertical direction as viewed from the side larger than the upstream space, and is supplied by a drum feeder. In the charging method of the sintered raw material, the sintered raw material is charged into the pallet while being classified by the bar screen via the charging chute.
On the condition that the supply amount of the sintering raw material supplied to the pallet per unit width and unit time of the pallet is reduced to a predetermined amount or less, the bars adjacent to each other in the vertical direction when viewed from the side are used. The interval on the downstream side is made narrower than the interval before the supply amount of the sintering raw material decreases.

In the method for charging sintered raw materials according to the first and second inventions, it is preferable that the interval between the bars adjacent to each other in the vertical direction when viewed from the side is adjusted by adjusting the inclination angle of each bar. .

The charging method of the sintering raw material according to the first invention is adjacent in the vertical direction as viewed from the side, on the condition that the supply amount of the sintering raw material supplied to the pallet is increased to a predetermined amount or more. The interval on the downstream side of the bar is made wider than the interval before the supply amount of the sintering raw material is increased. As a result, even if the flow rate of the sintering material flowing down on the bar screen increases with an increase in the supply amount of the sintering material, the sintering material overruns the bar screen without being classified by the bar screen. Therefore, the sintering raw material to be supplied to the pallet can be appropriately classified with a bar screen.
Moreover, the charging method of the sintering raw material which concerns on 2nd invention WHEREIN: On the condition that the supply amount of the sintering raw material supplied to a pallet decreased below the preset amount, it was vertical in the side view. The interval on the downstream side of adjacent bars is made narrower than the interval before the supply amount of the sintering raw material is reduced. As a result, even if the flow rate of the sintering raw material flowing down on the bar screen decreases with the decrease in the supply amount of the sintering raw material, the sintering raw material having a large particle size among the sintering raw materials supplied to the pallet is reduced. Further, it is possible to suppress passage between adjacent bars on the upstream side of the bar screen together with the sintered raw material having a small particle diameter, and the sintered raw material supplied to the pallet can be appropriately classified by the bar screen.
Therefore, it is possible to suppress a phenomenon in which the yield of sintered ore is lowered in time series due to increase or decrease in the supply amount of the sintering raw material supplied to the pallet, and it becomes possible to realize a high yield. .

Here, when the interval between the bars adjacent to each other in the vertical direction as viewed from the side is adjusted by adjusting the inclination angle of each bar, the phenomenon that the yield of sintered ore is lowered can be further suppressed by a simple method. .

(A) is explanatory drawing of the charging method of the sintering raw material which concerns on one embodiment of this invention, (B) is a perspective view of the bar screen which applies the charging method of the sintering raw material. (A)-(D) are the side view of the same bar screen, a top view, the front view of a front-end | tip, and the rear view of a base end, respectively. It is a graph which shows the influence which the supply amount of the sintering raw material to a pallet exerts on the segregation degree of the sintering raw material layer inserted into the pallet. It is a graph which shows the influence which the segregation degree of the sintering raw material layer with which the pallet was charged has on the yield of sintered ore. It is a graph which shows the relationship between the supply amount of the sintering raw material to a pallet, and the segregation degree of the sintering raw material layer inserted into the pallet. It is a graph which shows the relationship between the supply amount of the sintering raw material to a pallet, and the yield of a sintered ore. It is a graph which shows the relationship between the supply amount of the sintering raw material to a pallet, and the productivity of a sintered ore.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
First, with reference to FIGS. 1 (A), 1 (B), and FIGS. 2 (A) to 2 (D), a droidoid-type sintering to which a method for charging a sintered material according to an embodiment of the present invention is applied. A charging apparatus (hereinafter also simply referred to as a charging apparatus) 10 for sintering raw materials of the machine will be described.
The sintered raw material charging apparatus 10 slides the storage hopper 12 that stores the sintered raw material 11, the drum feeder (DF) 13 that cuts the sintered raw material 11 from the storage hopper 12, and the cut sintered raw material 11. And a charging chute 15 for charging into a lower pallet (hereinafter also referred to as a sintering pallet) 14.

On the downstream side of the charging chute 15, a bar screen 16 for charging the sintered raw material 11 falling from the lower part of the charging chute 15 onto the pallet 14 while being classified is provided.
As shown in FIGS. 1 (A), 1 (B), and 2 (B), the bar screen 16 has a distance d in the width direction of the charging chute 13 in a plan view on the downstream side of the charging chute 15. And a plurality of bars 17 to 19 extending along the flow-down direction of the sintering raw material 11 sliding on the charging chute 15. Each of the bars 17 to 19 is made of a metal rod (for example, iron or the like), and one end (upper end) of the bar 17 is charged in a state of being inclined downward along the flow direction of the sintering raw material 11. It is attached to the back side of the chute 15.

The cross-sectional shape of each of the bars 17 to 19 is usually circular, but is not particularly limited as long as the sintering raw material can be classified. For example, an oval shape, an oval shape, a triangular shape or a quadrangular shape ( A polygon such as a rectangle may be used.
Moreover, the length of each bar 17-19 will not be specifically limited if a sintering raw material can be classified, However, if the production amount of the sintered ore with a sintering machine in the world is considered, for example, 500- It is about 1000 mm.
Furthermore, as shown to FIG. 2 (A), downward inclination angle (alpha), (beta), (gamma) with respect to the horizontal direction of each bar 17-19 can be adjusted within the range of 30-55 degree | times.

As shown in FIG. 2A, each of the bars 17 to 19 has a first stage (upper stage) bar 17, a second stage (middle stage) bar 18, and a third stage (lower stage) in the vertical direction when viewed from the side. ) Bar 19. As described above, the bars 17 to 19 have a distance a1 between the downstream end (downstream side) between the first-stage bar 17 and the second-stage bar 18 that are adjacent in the vertical direction when viewed from the side, and the second-stage bar. The distance a2 between the downstream end (downstream side) between the bar 18 and the third-stage bar 19 is wider than the distance b1 and b2 between the upstream ends (upstream side), respectively (FIGS. 2C and 2D). reference). This is because the inclination angles α, β, and γ of the first to third bars 17 to 19 are increased from the upper side to the lower side (α <β <γ).
Here, the difference between the inclination angles of the first and second bars 17 and 18 (β−α), and the difference between the inclination angles of the second and third bars 18 and 19 (γ−β), It can be adjusted within a range of 1 to 7 degrees. In addition, although the difference of the inclination angle of each bar 17-19 is made the same, you may differ.

Here, the case where a plurality of bars are divided into three stages in the vertical direction has been described. However, there is no particular limitation as long as the sintering raw material can be classified, and there are two or more stages in the vertical direction (for example, four or more stages). ). In addition, although the front-end | tip space | interval of the perpendicular direction of each bar | burr 17-19 of the 1st-3rd stage | paragraph adjacent to an up-down direction seeing side is made the same, you may differ.
Moreover, as shown to FIG. 1 (B) and FIG.2 (C), the line which connects each bar | burr 17-19 to the front-end | tip position of each bar | burr 17-19 is a W-shape (1 or In the case of a plurality of mountain-shaped), an inverted W-shape or V-shape can be used, and further, a V-shape or an inverted V-shape is repeated over the width direction of the charging chute. It can also be shaped. It is of course possible to apply this shape to a line connecting the base end positions of the bars 17 to 19 as shown in FIG. 2D. It may be in the position.

Furthermore, the bar screen has a configuration in which the number of bars constituting the slopes of the peaks or valleys formed by the lines connecting the tip positions of the bars is three. However, the bar screen is particularly limited as long as the sintering raw material can be classified. Instead, it may be composed of two or more (for example, four or more). The bar screen may be one in which some of the plurality of bars are partially missing as long as the sintered raw material can be classified. For example, the number of bars constituting the slope of a mountain or valley formed by a line connecting the tip positions of the bars 17 to 19 shown in FIG. 2C is changed from three (the same number) to two or one ( Different numbers) may be used.
Further, as shown in FIG. 2B, the bars 17 to 19 adjacent in the width direction of the charging chute 15 in a plan view are arranged in parallel (the interval d is the same). It is not necessary to be completely parallel as long as the raw materials can be classified. For example, the interval may increase or decrease toward the tip of the bar.

Next, the background of the present invention will be described.
When the segregation charging method of the sintered raw material 11 using the bar screen 16 shown in FIGS. 1 (A), 1 (B) and 2 (A) to 2 (D) is adopted, the yield of sintered ore (the produced firing) When the mass ratio of 5 mm or more suitable for blast furnace charging for the ore) is approximately 75 to 85% by mass, the average diameter of the granulated product changes due to the change in the type of iron ore to be blended, or granulation due to rainfall It is generally known that the fluctuation in the ratio of the added water at the time becomes a large yield fluctuation factor (yield fluctuation of 2 to 3% by mass).

On the other hand, when the production fluctuation of the sintered ore by the sintering machine is 10% or more, the yield fluctuation of the sintered ore is the same as or more than the above fluctuation.
From this, the inventors of the present application newly paid attention to the fact that the fluctuation in the production amount of sintered ore is one of the largest yield fluctuation factors.
Since the next step of the sintering machine is a blast furnace, the production amount of sintered ore per unit time in the sintering machine is not always maintained at a high level, and the sintering required for hot metal production in the blast furnace Depending on the fluctuation of the ore amount, the production amount of the sintered ore manufactured by the sintering machine may be changed (increased or lowered).

When changing the production amount of sintered ore with a sintering machine, it is necessary to change the amount of sintering raw material supplied to the sintering machine. As shown in FIGS. 1 (A) and 1 (B), the sintered raw material 11 stored in the storage hopper 12 is transferred from the drum feeder 13 through the charging chute 15 and through the bar screen 16 to the pallet (hereinafter, sintered). In a droidoid sintering machine that flows down and is supplied to 14 (also referred to as a pallet), the supply amount of the sintering raw material 11 per unit time cut out by the drum feeder 13 (supplied toward the pallet 14) is increased. In other words, the above-described fluctuation can be realized by increasing the flow speed of the sintering raw material 11 on the bar screen 16.

Here, the result of investigating the influence of the supply amount of the sintering raw material to the pallet on the segregation degree of the sintering raw material layer charged in the pallet will be described.
As shown in FIG. 3, when the supply amount of the sintering raw material supplied to the pallet per unit width and unit time of the pallet increases from 200 (tons / hour / m) to 250 (tons / hour / m), the pallet It can be seen that the degree of segregation of the sintered raw material layer charged in is reduced.
Table 1 shows the contents of the bar screen test conditions used in the above investigation.

Moreover, the result of investigating the influence of the segregation degree of the sintering raw material layer charged on the pallet on the yield of the sintered ore will be described.
As shown in FIG. 4, it can be seen that when the segregation degree of the sintered raw material layer charged in the pallet decreases, the yield of the sintered ore (product (product) yield: mass%) decreases.
The degree of segregation described above is an index of the particle size distribution in the height (depth) direction of the sintered raw material layer (at least about 500 mm in thickness) charged in the pallet, and was calculated by the following equation.
(Segregation degree) = {(Average diameter of lower layer 50 mm of sintered raw material layer) − (Average diameter of upper layer of sintered raw material layer 50 mm)} / (Average diameter of all layers of sintered raw material layer)
From the above equation, it can be seen that the larger the degree of segregation, the more appropriate segregation charging is performed.

The above average diameter was calculated by the following method.
The sintered raw material after sampling and drying was described with 9.5 mm, 8.0 mm, 6.7 mm, 4.75 mm, 2.8 mm, 2.0 mm, 1.0 mm, and 0.5 mm sieves. Each group was sequentially classified into groups, and the representative diameter and the mass ratio (the mass of the sintered raw material belonging to the group with respect to the total mass of the sintered raw material) were determined for each group (JIS Z8801-1 “Sieving Test—No. Part 1: Metal mesh sieve "). And the product of the representative diameter and mass ratio was computed for every group, and those sum total was made into the average diameter of a sintering raw material. Here, the representative diameter is 12.5 mm when the sieve mesh is 9.5 mm over, 0.25 mm when the sieve mesh is 0.5 mm under, and other values are the center value of the sieve mesh (for example, 9.5 mm under and 8.0 mm over) 8.75 mm for the group).

From the above, the present inventors can vary the amount of sintering raw material supplied to the sintering machine, and segregate the sintering raw material layer from the upper layer portion to the lower layer portion of the sintering raw material layer charged in the pallet. It was thought that the degree of sinter decreased and the yield of sintered ore was greatly affected.
The supply amount of the sintering raw material 11 to the pallet 14 is discharged by changing the rotation speed of the drum of the drum feeder 13 or the gate height of the drum feeder 13 (changing the area of the discharge port 20 of the sintering raw material 11). It can be adjusted (varied) by changing the thickness of the sintered raw material 11 to be produced. Even if the supply amount of the sintering raw material 11 is adjusted by any of the above-described methods, the supply amount of the sintering raw material 11 (ton / hour / m: the firing supplied per unit width of the pallet 14 and per unit time). The flow rate of the sintered raw material 11 on the bar screen 16 changes according to the amount of the raw material 11).

Therefore, in the present invention, in order to suppress the phenomenon that the yield of sintered ore is reduced and to solve the problem of realizing a high yield, even if the supply amount of the sintering raw material is changed in the sintering process, the pallet Specifically, it is possible to provide a charging method capable of suppressing the yield reduction of the sintered ore by adjusting the sintering raw material layer charged in the state of charging with the optimum segregation degree in the height direction. It was set as a general issue.
Hereinafter, the method for charging the sintered material of the present invention will be described with reference to FIGS. 1 (A), 1 (B), and FIGS. 2 (A) to 2 (D).

The method for charging a sintered material according to one embodiment of the present invention is to charge the sintered material 11 supplied by the drum feeder 13 into the pallet 14 while classifying it by the bar screen 16 via the charging chute 15. The first-stage bar that is adjacent in the vertical direction as viewed from the side, on condition that the supply amount of the sintering raw material 11 supplied to the pallet 14 per unit time and unit time of the pallet 14 fluctuates. The amount of supply of the sintering raw material 11 is defined as the vertical interval a1 downstream of the 17th and second stage bars 18 and the vertical interval a2 downstream of the second stage bar 18 and third stage bar 19. This is a method of making it wider or narrower than the interval before fluctuating.
When the width of the sintering machine (pallet 14) is constant, as described above, if the supply amount of the sintering raw material 11 to the pallet 14 varies according to the production amount of the sintered ore, the sintering at the bar screen 16 The flow speed of the raw material 11 changes. As a result, the segregation degree of the 11 layers of the sintered raw material changes, and the yield of the sintered ore decreases.

Specifically, when the supply amount of the sintering raw material 11 is increased, the flow rate of the sintering raw material 11 is increased. Moreover, the segregation degree in the height direction of the 11 layers of the sintered raw material in the pallet 14 decreases because the firing speed of the sintered raw material 11 increases as the flow rate of the sintered raw material 11 increases, and overruns without being classified through the bar screen 16. This is because the ratio of the sintering raw material 11 increases and the ratio of the sintering raw material 11 that flows down from the tip of the bar screen 16 increases.
Therefore, the yield reduction of the sintered ore is caused by an increase in the amount of the sintered raw material 11 that is not properly classified by the bar screen 16 due to an increase in the flow rate of the sintered raw material 11. Therefore, on the condition that the supply amount of the sintering raw material 11 is increased to a predetermined amount or more, the intervals a1 and a2 on the downstream side of the bars 17 to 19 are set before the supply amount of the sintering raw material 11 is increased. That is, it is made wider than the interval when the increase amount (variation amount) of the supplied sintering raw material 11 is 0% by mass.

On the other hand, when the supply amount of the sintering raw material 11 decreases, the flow rate of the sintering raw material 11 decreases. In addition, the segregation degree in the height direction of the sintered raw material 11 layer in the pallet 14 is decreased when the flow rate of the sintered raw material 11 is reduced, the larger the particle size of the sintered raw material 11 supplied to the pallet 14. This is because the ratio of the sintered raw material 11 passing between the bars 17 to 19 on the upstream side of the bar screen 16 together with the small raw material 11 is increased.
Therefore, the decrease in the yield of sintered ore is caused by the increase in the amount of the sintered raw material 11 that is not properly classified by the bar screen 16 due to the decrease in the flow rate of the sintered raw material 11. Therefore, on the condition that the supply amount of the sintering raw material 11 has decreased to a predetermined amount or less, the intervals a1 and a2 on the downstream side of the bars 17 to 19 are set before the supply amount of the sintering raw material 11 decreases. That is, it is made narrower than the interval when the decrease amount (variation amount) of the supplied sintering raw material 11 is 0 mass%.

Here, the intervals a1 and a2 on the downstream side of the bars 17 to 19 can be adjusted by the following two methods.
The first is a method of adjusting the inclination angles α, β, γ of the bars 17-19, and the second is that the inclination angles α, β, γ of the bars 17-19 are kept constant, In this method, the bars 17 to 19 are translated in the height direction.
Here, in the first method, for example, one end (upper end) of each of the bars 17 to 19 is attached to the back side of the charging chute 15 via the angle adjusting means, and this is controlled by the control unit. Can be implemented.
Moreover, the 2nd method can be implemented by attaching the one end part of each bar | burr 17-19 to the back surface side of the insertion chute | shooting 15 via an raising / lowering means, and controlling this with a control part, for example.

Furthermore, the distances a1 and a2 on the downstream side of the respective bars 17 to 19 can be adjusted by combining the two methods described above.
The adjustment of the inclination angles α, β, γ of the bars 17 to 19 constituting each stage is preferably performed for all the bars 17 to 19 for each stage, but the supply amount of the sintering raw material 11 varies. Accordingly, it can be performed for one or more of all the stages, for example, only the third-stage bar 19, or the second-stage bar 18 and the third-stage bar 19.
Here, the inclination angles α, β, and γ of the bars 17 to 19 constituting each stage can be appropriately adjusted within the above-mentioned range by those skilled in the art according to the fluctuation of the supply amount of the sintering raw material 11.

Moreover, the fluctuation amount of the sintering raw material 11 used as the reference | standard which adjusts the space | interval a1, a2 of the downstream of each bar 17-19 is not specifically limited, For example, it is to the fluctuation | variation of the supply amount of the sintering raw material 11. Accordingly, before the supply amount of the sintering raw material 11 increases or decreases, that is, the interval when the fluctuation amount of the sintering raw material 11 to be supplied is 0 mass% can be gradually widened or narrowed.
However, when the supply amount of the sintering raw material fluctuates (increases or decreases) by 3% by mass or more, it is preferable to adjust the distances a1 and a2 on the downstream side of the bars 17 to 19. According to the knowledge of the present inventors, even if the supply amount of the sintering raw material is constant, the segregation degree has a certain variation. However, if the supply amount of the sintering raw material varies by about 3% by mass, the segregation degree is significant. Change (deterioration) occurs.
Therefore, when the supply amount of the sintering raw material changes by at least 3% by mass or more, the intervals a1 and a2 on the downstream side of the bars 17 to 19 may be changed. In addition, although the upper limit of the fluctuation | variation of the supply amount of a sintering raw material is not prescribed | regulated, in actual operation, it is about 50 mass%.

Next, examples carried out for confirming the effects of the present invention will be described.
Here, the sintered raw material 11 is charged into the pallet 14 using the sintered raw material charging device 10 shown in FIGS. 1 (A), 1 (B) and 2 (A) to 2 (D). It was. Specifically, the drum of the drum feeder 13 is rotated from the storage hopper 12 storing the sintered raw material 11 (pseudo particles) having an average diameter of 2 to 5 mm obtained by granulating the raw material, and the sintered raw material 11 is stored. The hopper 12 was cut into the charging chute 15 and slid. Then, by dropping the sintered raw material 11 onto a bar screen 16 provided on the downstream side of the charging chute 15 and classifying it, the charging is performed so that the upper layer is fine and the lower layer is rough on the pallet 14. did.

Table 2 shows the bar screen test conditions when the supply amount of the sintering raw material to the pallet is increased from 200 (tons / hour / m) to 250 (tons / hour / m). The contents of the test conditions are shown respectively.

Condition 2 shown in Table 3 is that the first step and second step bar tip interval a1 of condition 1 and the second step and third step bar tip interval a2 are each increased by 5 mm. This is a condition in which the eyes and the third-stage bar are each translated downward. In condition 3, the first step and second step bar tip intervals a1 and the second step and third step bar tip intervals a2 of condition 1 are increased by 5 mm, respectively. This is a condition in which the angle is changed starting from the base end of the third-stage bar.

First, the segregation degree of the sintering material layer when the supply amount of the sintering material to the pallet is increased from 200 (ton / hour / m) to 250 (ton / hour / m) with reference to FIG. explain.
As is apparent from FIG. 5, when the supply amount of the sintering raw material to the pallet is increased, the amount of decrease in the segregation degree of the comparative example (condition 1 remains unchanged) in which the bar interval is not changed is large (about 0.4). However, the amount of decrease in the degree of segregation in Examples 1 and 2 in which the bar interval was changed was smaller than that in the comparative example (Example 1: about 0.17, Example 2: about 0.1). In particular, Example 2 (condition 1 to condition 3) in which the bar interval was changed by adjusting the angle of the bar is more segregated than Example 1 (condition 1 to condition 2) in which the bar interval was changed by parallel movement of the bar. The amount of decrease in degree could be reduced.

Next, regarding the yield of sintered ore (product yield: mass%) when the supply amount of the sintering raw material to the pallet is increased from 200 (tons / hour / m) to 250 (tons / hour / m), This will be described with reference to FIG.
As is apparent from FIG. 6, when the supply amount of the sintering raw material to the pallet was increased, the decrease in the product yield of the comparative example in which the bar interval was not changed was large (about 5% by mass). The amount of decrease in the product yield of Examples 1 and 2 in which the above was changed was smaller than that of the comparative example (Example 1: about 2.5% by mass, Example 2: about 1.5% by mass). In particular, Example 2 in which the interval between bars was changed by adjusting the angle of the bar was able to reduce the amount of decrease in product yield compared to Example 1.

Finally, the productivity of the sintered ore when the supply amount of the sintering raw material to the pallet is increased from 200 (ton / hour / m) to 250 (ton / hour / m) (ton / day / m ² ). Will be described with reference to FIG.
As is clear from FIG. 7, when the supply amount of the sintering raw material to the pallet is increased, the increase in productivity of Examples 1 and 2 in which the bar interval is changed is the same as that in the comparative example in which the bar interval is not changed. It was possible to increase more than the increase in productivity. In particular, Example 2 in which the interval between bars was changed by adjusting the angle of the bar was able to increase productivity compared to Example 1.

From the above, the method of charging the sintered raw material of the present invention, that is, by adjusting the interval on the downstream side of each bar in accordance with the fluctuation of the supply amount of the sintered raw material charged into the pallet, It was confirmed that high yields could be achieved by suppressing the phenomenon of yield reduction in time series.

As described above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to the configuration described in the above embodiment, and the matters described in the scope of claims. Other embodiments and modifications conceivable within the scope are also included. For example, a case where the method for charging a sintered raw material of the present invention is configured by combining a part or all of the above-described embodiments and modifications is also included in the scope of the right of the present invention.
Further, in the embodiment, when the supply amount of the sintering raw material supplied to the pallet is increased, the interval between the bars adjacent to each other in the vertical direction is widened in a side view, and the supply amount is decreased. The case where the space | interval of the downstream of the bar | burr adjacent to an up-down direction is narrowed by side view was demonstrated. However, when the supply amount of the sintering raw material decreases, the interval on the downstream side of each bar is not changed, and only when the supply amount increases, the interval on the downstream side of each bar is widened, or the supply amount of the sintering raw material It is also possible to narrow the interval on the downstream side of each bar only when the supply amount is reduced without changing the interval on the downstream side of each bar when the value increases.

10: Sintering raw material charging device, 11: Sintering raw material, 12: Storage hopper, 13: Drum feeder, 14: Pallet, 15: Charging chute, 16: Bar screen, 17-19: Bar, 20: Release Exit

Claims (3)

Provided on the downstream side of the charging chute for the sintering raw material is provided with a plurality of bars arranged in the width direction of the charging chute and extending along the flow-down direction of the sintering raw material. Provided with a bar screen in which the interval on the downstream side of the bars adjacent to each other in the vertical direction is wider than the interval on the upstream side, and the sintered raw material supplied by the drum feeder is passed through the charging chute by the bar screen. In the charging method of the sintering raw material that is charged into the pallet while classifying,
On the condition that the supply amount of the sintering raw material supplied to the pallet per unit width and unit time of the pallet is increased to a preset amount or more, the bars adjacent to each other in the vertical direction in the side view A method for charging a sintered material, characterized in that a downstream space is made wider than a space before the supply amount of the sintered material is increased. Provided on the downstream side of the charging chute for the sintering raw material is provided with a plurality of bars arranged in the width direction of the charging chute and extending along the flow-down direction of the sintering raw material. Provided with a bar screen in which the interval on the downstream side of the bars adjacent to each other in the vertical direction is wider than the interval on the upstream side, and the sintered raw material supplied by the drum feeder is passed through the charging chute by the bar screen. In the charging method of the sintering raw material that is charged into the pallet while classifying,
On the condition that the supply amount of the sintering raw material supplied to the pallet per unit width and unit time of the pallet is reduced to a predetermined amount or less, the bars adjacent to each other in the vertical direction when viewed from the side are used. A method for charging a sintered material, characterized in that an interval on the downstream side is narrower than an interval before the supply amount of the sintered material is reduced. 3. The method for charging a sintered material according to claim 1, wherein the interval between the bars adjacent to each other in the vertical direction when viewed from the side is adjusted by adjusting the inclination angle of each bar. A method for charging sintered raw materials.

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