JP7501489B2 - Sintered ore manufacturing method and sintering machine - Google Patents

Description

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

Conventionally, in sintering machines used to produce sintered ore, the raw sinter material is loaded onto an endlessly movable pallet, and the sintered raw material layer (loading layer) formed by loading the raw material onto the pallet is ignited and gaseous fuel is blown in (supplied) to sinter the raw sinter material, producing a sintered cake that is the basis of sintered ore.

Patent Document 1 discloses a method for producing sintered ore in which gaseous fuel is injected into the surface of a sintering raw material layer downstream of an ignition furnace that ignites the sintering raw material layer on a pallet to sinter the sintering raw material.

JP 2008-095170 A

However, in conventional sintered ore production, the gaseous fuel is discharged horizontally (sideways) from a nozzle that supplies the gaseous fuel, and after the gaseous fuel is uniformly spread across the width of the sintering machine, the gaseous fuel is sucked into the sintering raw material layer by an intake-driven wind box, and the design concept is to supply the gaseous fuel uniformly across the width of the sintering machine to the surface of the sintering raw material layer. For this reason, if an area of localized heat deficiency occurs inside the sintering raw material layer, it is not possible to take measures to compensate for the heat deficiency in that area, resulting in a problem of reduced product yield.

The present invention was made in consideration of these circumstances, and aims to provide a sintering machine and method for producing sintered ore that can eliminate localized heat deficiencies in the charging bed and suppress a decrease in the yield of sintered ore by enabling adjustment of the amount of gaseous fuel supplied in the width direction of the sintering machine.

The gist and configuration of the present invention to solve the above problems are as follows.
[1] A method for producing sintered ore, comprising: charging sintered raw materials containing iron-containing raw materials and agglomeration material into an endless moving pallet with an ore feeding device of a sintering machine to form a charging layer; igniting the agglomeration material in the charging layer with an ignition furnace provided downstream of the ore feeding device; supplying different amounts of gaseous fuel to the charging layer from a gaseous fuel supply device provided downstream of the ignition furnace in the width direction of the pallet; sucking air in the charging layer with a wind box provided below the pallet; burning the agglomeration material to sinter the sintered raw materials to form a sintered cake; and crushing the sintered cake to form sintered ore. The gaseous fuel supply device has a plurality of gaseous fuel supply pipes having a plurality of gaseous fuel discharge nozzles in the moving direction of the pallet, and the plurality of gaseous fuel supply pipes are provided at different positions in the width direction, and the gaseous fuel discharged from the gaseous fuel discharge nozzle is discharged so as to satisfy the following formula (1).
tan A≦(W/2)/H (1)
In equation (1), A is the discharge angle (°) of the gas fuel supplied from the gas fuel discharge nozzle extending in the width direction relative to the vertical downward direction, W is the distance (m) between adjacent gas fuel discharge nozzles in the width direction, and H is the distance (m) from the gas fuel discharge nozzle to the upper surface of the loading bed.
[2] The method for producing sintered ore described in [1], in which the amount of gaseous fuel supplied to both ends of the sintering bed in the width direction is increased to be greater than the average amount of gaseous fuel supplied throughout the width direction.
[3] A method for producing sintered ore described in [1] or [2], which identifies a position of the sintering layer in the width direction where the amount of heat during sintering is insufficient, and increases the amount of gaseous fuel supplied to that position beyond the overall average gaseous fuel supply in the width direction.
[4] A sintering machine comprising: a feeding device for feeding sintering raw materials containing iron-containing raw materials and agglomeration material; an endless moving pallet on which the sintering raw materials are charged to form a charging layer; an ignition furnace provided downstream of the feeding device for igniting the agglomeration material in the charging layer; a gaseous fuel supplying device provided downstream of the ignition furnace for supplying different amounts of gaseous fuel to the charging layer in the width direction of the pallet; and a wind box provided below the pallet for sucking air in the charging layer, wherein the gaseous fuel supplying device has a plurality of gaseous fuel supply pipes having a plurality of gaseous fuel discharge nozzles in the moving direction of the pallet, and the plurality of gaseous fuel supply pipes are provided at different positions in the width direction perpendicular to the moving direction, and the gaseous fuel discharge nozzle is configured so that the discharged gaseous fuel satisfies the following formula (1).
tan A≦(W/2)/H (1)
In equation (1), A is the discharge angle (°) of the gas fuel supplied from the gas fuel discharge nozzle extending in the width direction relative to the vertical downward direction, W is the distance (m) between adjacent gas fuel discharge nozzles in the width direction, and H is the distance (m) from the gas fuel discharge nozzle to the upper surface of the loading bed.

According to the present invention, it is possible to adjust the amount of gaseous fuel supplied in the width direction of the sintering machine. Even if there are some areas in the charging bed that are partially deficient in heat, the amount of gaseous fuel supplied in the width direction of the sintering machine can be adjusted to eliminate the localized heat shortage in the charging bed, thereby suppressing a decrease in the yield of sintered ore.

FIG. 1 is a schematic diagram showing an example of a sintered ore manufacturing apparatus. FIG. 2 is a schematic cross-sectional view of the gas fuel supply device. FIG. 2 is a schematic cross-sectional view of a gas fuel discharge nozzle. FIG. 1 is a diagram showing the results of a yield survey of a cross-sectional area of a sintering bed. 1 is a graph showing the relationship between the coke rate and the amount of shrinkage of the sintering bed.

The present invention will be described below through the embodiments of the present invention. Figure 1 is a schematic diagram showing an example of a sintered ore manufacturing apparatus 10 in which the sintered ore manufacturing method according to this embodiment can be implemented. Iron-containing raw materials 12 stored in a yard 11 are transported to a blending tank 22 by a transport conveyor 14. The iron-containing raw materials 12 include various brands of iron ore and dust generated in a steelworks.

The raw material supply section 20 includes a number of blending tanks 22, 24, 25, 26, and 28. The blending tank 22 stores the iron-containing raw material 12. The blending tank 24 stores the CaO-containing raw material 16, which includes limestone and quicklime. The blending tank 25 stores the MgO-containing raw material 17, which includes dolomite and refined nickel slag. The blending tank 26 stores the coke powder and anthracite aggregate 18, which are crushed to a particle size of 1 mm or less using a rod mill. The blending tank 28 stores the return ore (sintered ore undersieve powder) with a particle size of 5 mm or less that has been sieved from the sintered ore.

A predetermined amount of each raw material is dispensed from the blending tanks 22 to 28 of the raw material supply section 20 and blended to form the sintering raw material. The sintering raw material is transported to the drum mixer 36 by the transport conveyor 30. The MgO-containing raw material 17 is an optional blending raw material that may or may not be blended into the sintering raw material.

The sintering raw material transported to the drum mixer 36 is added with an appropriate amount of water 34 and fed into the drum mixer 36, where it is granulated into pseudo-particles with an average particle size of, for example, 3.0 to 6.0 mm. The granulated sintering raw material is transported by a transport conveyor 38 to the ore feeder 42 of the sintering machine 40. The drum mixer 36 is an example of a granulation device that granulates the sintering raw material, and there may be multiple drum mixers 36, or a pelletizer granulator may be used instead of the drum mixer 36. In addition, both the drum mixer 36 and the pelletizer granulator may be used, or a high-speed agitator may be installed upstream of the drum mixer 36 to agitate the sintering raw material.

In this embodiment, the average particle size of the pseudo-particles is the arithmetic mean particle size, which is defined as Σ(Vi×di) (where Vi is the abundance ratio of particles in the i-th particle size range, and di is the representative particle size of the i-th particle size range).

The sintering machine 40 is, for example, a downward suction type Dwight Lloyd sintering machine. The sintering machine 40 has an ore supplying device 42, an endless moving pallet 44, an ignition furnace 46, a gas fuel supplying device 47, and a wind box 48 such as a wind box. The sintering raw materials are charged into the pallet 44 in the ore supplying device 42, and a charging layer of the sintering raw materials is formed. Then, the pallet 44 on which the charging layer is formed moves to the ignition furnace 46 provided downstream of the ore supplying device 42. The ignition furnace 46 ignites the coagulant 18 contained in the surface layer of the charging layer. After that, while sucking air through the wind box 48, the gas fuel supplying device 47 provided downstream of the ignition furnace 46 sucks gas fuel and oxygen-enriched air into the charging layer, and the gas fuel and coagulant 18 are combusted in the charging layer, while the combustion and melting zone in the charging layer is moved downward. As a result, the charging layer is sintered to form a sintered cake. As gaseous fuel, combustible gases such as blast furnace gas, coke oven gas, blast furnace/coke oven mixed gas, converter gas, natural gas, methane gas, ethane gas, propane gas, city gas, and shale gas may be used.

In this embodiment, the length direction of the sintering machine 40 is the same as the direction of movement of the pallet 44, and the width direction of the sintering machine 40 is perpendicular to the direction of movement and is the same as the width direction of the pallet 44.

The sintered cake is crushed by the crusher 50, cooled by the cooler 60, and sieved by the sieving device 70. In this way, sintered ore with a particle size of more than 5 mm is produced. Meanwhile, the return ore 74 with a particle size of 5 mm or less sieved by the sieving device 70 is transported by the conveyor 78 to the blending tank 28 of the raw material supply section 20. The particle sizes of the sintered ore 72 and the return ore 74 refer to the particle sizes sieved by the sieve. For example, a particle size of more than 5 mm is a particle size that is sieved onto a sieve with a mesh size of 5 mm, and a particle size of 5 mm or less is a particle size that is sieved below a sieve with a mesh size of 5 mm. The particle sizes of the sintered ore 72 and the return ore 74 are merely examples and are not limited to these values.

Next, the configuration of the gas fuel supply device 47 will be described with reference to FIG. 2. FIG. 2 is a schematic cross-sectional view of the gas fuel supply device 47. In FIG. 2, the horizontal direction of the drawing corresponds to the width direction of the sintering machine 40 and the pallet 44. The depth direction of the drawing corresponds to the machine length direction of the sintering machine 40, and corresponds to the movement direction of the pallet 44.

The gaseous fuel supply device 47 shown in FIG. 2 has a rectangular tubular hood 6, a plurality of oxygen-enriched air supply pipes 1, a plurality of gaseous fuel supply pipes 3, and a plurality of shielding plates 2. As shown in FIG. 2, the gaseous fuel supply device 47 is provided with, for example, 13 oxygen-enriched air supply pipes 1, 7 gaseous fuel supply pipes 3, and 41 shielding plates 2 in the width direction of the sintering machine 40 and the pallet 44. These are provided in the order of the gaseous fuel supply pipes 3, the shielding plates 2, and the oxygen-enriched air supply pipes 1 from bottom to top in the rectangular tubular hood 6. The 13 oxygen-enriched air supply pipes 1 are provided with a plurality of oxygen-enriched air discharge nozzles at different positions in the machine length direction (movement direction of the pallet 44) of the sintering machine 40, and the seven gaseous fuel supply pipes 3 are also provided with a plurality of gaseous fuel discharge nozzles 3a at different positions in the machine length direction. In addition, the gaseous fuel supply pipes 3 are provided at different positions in the width direction of the pallet 44 perpendicular to the machine length direction.

Oxygen-enriched air is discharged from each oxygen-enriched air discharge nozzle, and the oxygen-enriched air is supplied to the charging layer 4. Gaseous fuel is discharged from each gaseous fuel discharge nozzle 3a, and the gaseous fuel is supplied to the charging layer 4. The upper layer of the charging layer 4 is more likely to have a lower temperature during sintering than the middle and lower layers, and the yield is more likely to decrease. In this regard, in this embodiment, by supplying gaseous fuel and oxygen-enriched air to the charging layer 4, the temperature during sintering of the upper layer of the charging layer 4 can be increased, and the decrease in the yield of the upper layer of the charging layer 4 can be suppressed. In addition, the shielding plate 2 prevents the gaseous fuel from rising and suppresses the mixing of the oxygen-enriched air and the gaseous fuel at the upper part (the space above the oxygen-enriched air supply pipe 1 in the hood 6).

Although the configuration in which the oxygen-enriched air supply pipe 1 and the shield plate 2 are provided in the gaseous fuel supply device 47 has been described using FIG. 2, the oxygen-enriched air supply pipe 1 and the shield plate 2 do not necessarily have to be provided. However, providing the shield plate 2 suppresses the effect of the wind (airflow) around the sintering machine 40 on the gaseous fuel and suppresses the scattering of the gaseous fuel outside the hood 6, so it is preferable to provide the shield plate 2 in the gaseous fuel supply device 47. The gaseous fuel supply device 47 has a control device (not shown) that controls the amount of gaseous fuel supplied to each gaseous fuel supply pipe 3. The amount of gaseous fuel supplied to each gaseous fuel supply pipe 3 is controlled by the control device.

Next, the configuration of the gas fuel discharge nozzle 3a will be described with reference to FIG. 3. FIG. 3 is a schematic cross-sectional view of the gas fuel discharge nozzle 3a. As shown in FIG. 3, if the discharge angle, which is the widthwise spread angle of the gas fuel discharged from the gas fuel discharge nozzle 3a with respect to the vertical downward direction, is A, the gas fuel discharge nozzle 3a is configured so that the discharge angle A of the gas fuel discharged from the gas fuel discharge nozzle 3a satisfies the following formula (1).

[Equation 1]
tan A≦(W/2)/H (1)

In the above formula (1), A is the discharge angle (°) of the gas fuel supplied from the gas fuel discharge nozzle 3a in the width direction relative to the vertical downward direction, W is the distance (m) between adjacent gas fuel discharge nozzles 3a in the width direction, and H is the distance (m) from the gas fuel discharge nozzle 3a to the upper surface of the loading bed 4.

In this embodiment, by configuring the gas fuel discharge nozzle 3a to satisfy the above formula (1), it becomes possible to divide the gas fuel supply area for supplying the gas fuel to the upper surface of the charging layer 4, and to select a specific supply area from among multiple supply areas to supply the gas fuel.

The amount of gas fuel supplied to the selected supply area can be adjusted by controlling the amount of gas fuel supplied to each gas fuel discharge nozzle 3a. If the above formula (1) is not satisfied, the areas to which gas fuel is supplied by adjacent gas fuel discharge nozzles 3a in the width direction of the charging bed 4 (horizontal direction in Figure 3) will partially overlap, making it difficult to adjust the amount of gas fuel supplied to the selected supply area.

On the other hand, if the discharge angle A is too small, the region where the gas fuel is not supplied to the charging bed 4 becomes large. For this reason, it is preferable that the gas fuel discharge nozzle 3a satisfies the following formula (2) in addition to satisfying the above formula (1).
tan A ≧(W / 4) / H ... (2)

Next, the yield of sintered ore when sintered ore is produced using a conventional supply method without supplying city gas and oxygen gas will be explained using Figure 4. Figure 4 shows the results of a sintered ore yield survey of a cross-sectional area divided into 3 rows and 10 columns in the cross-sectional direction from the upper layer to the lower layer for a charging layer 4 with a width of 4 m and a charging layer thickness of 570 mm. The numerical value in each cross-sectional area is the yield value of the final product in that cross-sectional area.

As shown in Figure 4, the yield is lower in the upper layer of the charging layer 4 than in the lower layer, and the yield is lower at both ends than in the widthwise center of the pallet 44. For this reason, when gaseous fuel is supplied to the charging layer 4 to improve the yield, if the gaseous fuel is supplied uniformly in the width direction based on the yield at the widthwise center, the yield at both ends cannot be sufficiently increased. On the other hand, if the gaseous fuel is supplied uniformly in the width direction based on the yield at both ends, the amount of gaseous fuel supplied to the widthwise center will be excessive, and the cost of the excess gaseous fuel will increase.

In contrast, in the sintered ore manufacturing method and sintering machine according to this embodiment, it is possible to divide the gas fuel supply area in the width direction of the charging layer 4 on the upper surface of the charging layer 4, and it is possible to select a specific supply area from the multiple supply areas and adjust the amount of gas fuel supplied to that supply area. Therefore, with regard to the amount of gas fuel supplied in the width direction of the pallet 44 of the charging layer 4, the amount of gas fuel supplied to both ends in the width direction can be increased more than the overall average gas fuel supply amount. This makes it possible to improve the yield at both ends in the width direction of the pallet 44 compared to other areas, thereby improving the yield of sintered ore while suppressing excessive supply of gas fuel.

Next, the relationship between the coke ratio and the amount of shrinkage of the charging layer will be explained using FIG. 5. FIG. 5 is a graph showing the relationship between the coke ratio and the amount of shrinkage of the charging layer. The coke ratio is the mixing ratio (mass%) of fine coke, which is the agglomeration material 18 contained in the sintering raw material. The amount of shrinkage (mm) of the charging layer 4 indicates how much the upper surface position of the charging layer 4 after the sintering raw material is charged into the pallet 44 and the charging layer 4 is formed is lowered after sintering, and is calculated from the difference between the upper surface height after the charging layer 4 is formed and the upper surface height of the charging layer 4 after sintering.

As shown in Figure 5, it can be seen that the amount of shrinkage of the charging layer 4 increases as the coke ratio of the sintering raw materials increases. Here, the coke ratio of the sintering raw materials indicates the amount of heat during sintering, so from this result, it can be seen that there is a correlation between the amount of shrinkage of the charging layer 4 due to sintering and the amount of heat during sintering, and that the amount of heat during sintering can be calculated by measuring the amount of shrinkage of the charging layer 4.

In other words, by installing a non-contact position measuring device at the position immediately after the charging layer 4 is formed and at the end of the sintering machine (the position where the sintering process of the charging layer 4 is completed) and measuring the height of the upper surface at each position, and calculating the difference in height (amount of shrinkage) of the upper surface of the charging layer 4 before and after sintering, it becomes possible to identify the position in the width direction of the charging layer 4 where there is a heat shortage. A laser displacement meter or an ultrasonic distance meter can be used as the non-contact position measuring device.

Therefore, in the sintered ore manufacturing method and sintering machine according to this embodiment, the amount of shrinkage of the charging layer 4 after sintering can be measured to identify the widthwise position of the charging layer 4 where the amount of heat during sintering is insufficient, and the amount of gaseous fuel supplied to the position of the supply area corresponding to that position can be increased above the overall average gaseous fuel supply in that widthwise direction.

In addition, even if the amount of shrinkage of the charging layer 4 after sintering is not measured, if the positions where there will be a heat shortage during sintering (for example, both ends in the width direction of the charging layer 4) are identified in advance, the amount of gaseous fuel supplied to both ends in the width direction of the charging layer 4 may be increased from the overall average amount of gaseous fuel supplied.

In this way, even if there are positions in the width direction of the pallet 44 where the amount of heat during sintering is low due to fluctuations in the component concentrations of the sintering raw materials, the position in the charging layer 4 where the amount of heat has decreased can be identified, and the amount of gaseous fuel supplied to the supply area corresponding to that position can be increased more than other supply areas to compensate for the amount of heat, thereby suppressing a decrease in sintered ore productivity (decrease in yield) due to a decrease in heat.

Below, we will explain an example in which the yield of sintered ore was investigated using the sintering method and sintering machine according to this embodiment.

In this example, the discharge angle A of the gas fuel from the gas fuel discharge nozzle 3a with respect to the charging bed 4 was changed, and the yield (%) at both ends in the width direction of the upper layer of the charging bed 4 was calculated when the discharge angle A was changed. In all examples (Invention Examples 1 to 4 and Comparative Examples 1 and 2), 65 Nm ³ /h (total 130 Nm ³ /h) of city gas was discharged from two gas fuel discharge nozzles 3a at both ends in the width direction out of the seven gas fuel discharge nozzles 3a shown in Figure 2. The yield (%) at both ends in the width direction of the upper layer of the charging bed 4 at the gas fuel discharge angle A and the values of formulas (1) and (2) are shown in Table 1.

Here, as a conventional method before carrying out this embodiment, city gas was supplied from seven gaseous fuel discharge nozzles 3a with the discharge direction facing horizontally, and the yield of sintered ore at both ends in the width direction of the upper layer of the charging bed 4 was investigated. In this case, the concentration of city gas was adjusted to 0.4 vol. % relative to the suction air, and the supply amount was 18.6 ^Nm3 /h (total 130 ^Nm3 /h). As a result, the average yield of sintered ore at both ends in the width direction of the upper layer of the charging bed 4 was 70%.

In Example 1, when gas fuel was discharged with a discharge angle A of 10°, the average yield of sintered ore at both ends in the width direction of the upper layer of the charging layer 4 was 72%. In addition, formula (1) was satisfied, but formula (2) was not satisfied.

In Example 2, when gas fuel was discharged with a discharge angle A of 20°, the average yield of sintered ore at both ends in the width direction of the upper layer of the charging layer 4 was 75%. In addition, both formulas (1) and (2) were satisfied.

In Example 3, when gas fuel was discharged with a discharge angle A of 30°, the average yield of sintered ore at both ends in the width direction of the upper layer of the charging layer 4 was 74%. In addition, formula (1) was satisfied, but formula (2) was not satisfied.

In Example 4, when gas fuel was discharged with a discharge angle A of 40°, the average yield of sintered ore at both ends in the width direction of the upper layer of the charging layer 4 was 73%. In addition, both formulas (1) and (2) were satisfied.

In Comparative Example 1, when the gas fuel was discharged with a discharge angle A of 50°, the average yield of sintered ore at both ends in the width direction of the upper layer of the charging layer 4 was 71%. In addition, formula (2) was satisfied, but formula (1) was not satisfied.

In Comparative Example 2, where the discharge angle A was 60°, gas fuel was discharged under similar conditions, and the average yield of sintered ore at both ends in the width direction of the upper layer of the charging layer 4 was 69%. Also, like Comparative Example 1, it satisfied formula (2) but did not satisfy formula (1).

As shown by the results of Comparative Example 1 and Comparative Example 2, when the discharge angle A does not satisfy Equation (1), even if 65 ^Nm3 /h (a total of 130 ^Nm3 /h) of gas fuel is supplied from the two gas fuel discharge nozzles 3a at both ends in the width direction, the gas fuel diffuses to other supply areas on the upper surface of the loading bed 4 other than the selected supply area, and it was confirmed that the yield at both ends in the width direction of the loading bed 4 cannot be improved.

In other words, as shown in Table 1 under "Blowing of gaseous fuel," Examples 1 to 4, which satisfy formula (1), provide good blowing of gaseous fuel (shown as "○" and "◎" in Table 1), while Comparative Examples 1 and 2, which do not satisfy formula (1), are marked as "×."

From the above results, by using the sintered ore manufacturing method and sintering machine of the present invention, the amount of gaseous fuel supplied to a specific supply area in the width direction of the charging bed 4 can be adjusted by setting the gaseous fuel discharge angle A of the gaseous fuel discharge nozzle 3a so as to satisfy formula (1). This can eliminate localized heat deficiencies in the width direction of the charging bed 4, and suppress a decrease in the yield of sintered ore.

LIST OF SYMBOLS 1 Oxygen-enriched air supply pipe 2 Shield plate 3 Gaseous fuel supply pipe 3a Gaseous fuel discharge nozzle 4 Charging bed 6 Hood 10 Sintered ore manufacturing device 11 Yard 12 Iron-containing raw material 14, 30, 38, 76, 78 Transport conveyor 16 CaO-containing raw material 17 MgO-containing raw material 18 Coagulant 20 Raw material supply section 22, 24, 25, 26, 28 Blending tank 34 Water 36 Drum mixer 40 Sintering machine 42 Ore feeding device 44 Pallet 46 Ignition furnace 47 Gaseous fuel supply device 48 Wind box 50 Crusher 60 Cooling machine 70 Sieving device 72 Sintered ore 74 Return ore 80 Blast furnace A Discharge angle H Distance from gaseous fuel discharge nozzle to upper surface of charging bed W Distance between adjacent gas fuel discharge nozzles in the width direction

Claims (3)

A sintering raw material containing an iron-containing raw material and a coagulant is charged into an endless moving pallet by a feeding device of the sintering machine to form a charging layer;
The ignition furnace provided downstream of the ore feeding device ignites the coagulated material in the sintering bed;
A gas fuel supply device provided downstream of the ignition furnace supplies different amounts of gas fuel to the charging bed in a width direction of the pallet,
A method for producing sintered ore, comprising the steps of: sucking air from within the sintering bed using a wind box provided below the pallet; burning the coagulant to sinter the sintered raw material into a sintered cake; and then crushing the sintered cake into sintered ore,
The gas fuel supply device includes a plurality of gas fuel supply pipes each having a plurality of gas fuel discharge nozzles in a moving direction of the pallet,
The plurality of gas fuel supply pipes are provided at different positions in the width direction,
A method for producing sintered ore, comprising: identifying a position of the charging layer in the width direction where the amount of heat during sintering is insufficient; increasing the amount of gaseous fuel supplied to the position above the overall average amount of gaseous fuel supplied in the width direction; and discharging the gaseous fuel from the gaseous fuel discharge nozzle so as to satisfy the following formula (1).
tan A≦(W/2)/H (1)
In equation (1), A is the discharge angle (°) of the gas fuel supplied from the gas fuel discharge nozzle extending in the width direction relative to the vertical downward direction, W is the distance (m) between adjacent gas fuel discharge nozzles in the width direction, and H is the distance (m) from the gas fuel discharge nozzle to the upper surface of the loading bed. The method for producing sintered ore according to claim 1, in which the amount of gaseous fuel supplied to both ends of the charging bed in the width direction is increased to be greater than the average amount of gaseous fuel supplied in the entire width direction. A feeder for supplying sinter raw materials including an iron-containing raw material and a coagulant;
An endless movable pallet on which the sintering raw material is charged to form a charging layer;
An ignition furnace provided downstream of the ore feeding device for igniting the condensed material in the sintering bed;
A gas fuel supply device is provided downstream of the ignition furnace and supplies different amounts of gas fuel to the charging bed in a width direction of the pallet;
an air box provided below the pallet for sucking air from within the sintering bed;
A sintering machine having
the gas fuel supply device has a plurality of gas fuel supply pipes each having a plurality of gas fuel discharge nozzles in a moving direction of the pallet, the plurality of gas fuel supply pipes being provided at different positions in a width direction perpendicular to the moving direction,
The gas fuel discharge nozzle increases the amount of gas fuel supplied toward a position of the charging layer in the width direction where a heat amount shortage during sintering has been identified, more than the overall average gas fuel supply amount in the width direction, and is configured so that the discharged gas fuel satisfies the following equation (1).
tan A≦(W/2)/H (1)
In equation (1), A is the discharge angle (°) of the gas fuel supplied from the gas fuel discharge nozzle extending in the width direction relative to the vertical downward direction, W is the distance (m) between adjacent gas fuel discharge nozzles in the width direction, and H is the distance (m) from the gas fuel discharge nozzle to the upper surface of the loading bed.

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