JPH11217604A - How to charge the blast furnace - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a smooth blast furnace operation that forms a cohesive zone that is stable against changes in the furnace conditions due to variations in the quality and production of pig iron produced by the blast furnace. To provide a method of charging a blast furnace with a charge suitable for forming a cohesive zone shape for performing the heat treatment. SOLUTION: When charging a charge in a bellless blast furnace into a blast furnace interior, coke is charged into a lower part in a furnace top hopper immediately above the blast furnace, and then iron ore is charged into the upper part thereof, and coke and iron ore are charged in the furnace hopper. After the stones are stored in layers, the shut-off valve is opened, and the charge is started from the vicinity of the center of the blast furnace in the blast furnace or from the middle of the blast furnace via the swirl chute, and the swirl chute is sequentially moved toward the blast furnace wall. A method for charging a blast furnace in which charging is completed on the blast furnace wall side while moving, and a mixed layer of coke and iron ore is formed in the blast furnace.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention forms a cohesive zone that is stable against changes in the furnace conditions due to variations in the quality and production of pig iron produced by a blast furnace, and performs a smooth blast furnace operation. For charging a charge to a blast furnace suitable for forming a cohesive zone shape for use.

[0002]

2. Description of the Related Art There are two main control means in a blast furnace: charge distribution control and blowing control. The raceway conditions (raceway shape, raceway temperature distribution, raceway gas composition distribution, etc.) are determined by the ventilation control, but the charge distribution control is based on the gas flow distribution, melting, which affects the reaction heat transfer in the blast furnace. It is the most commonly used and most important control because it is the only means of determining the shape of the garment.

[0003] Although a method and a shape of a cohesive zone in a blast furnace are already known, the formation thereof will be described below again. Generally, the blast furnace is made of iron ore,
Sinter ore, pellets (hereinafter, simply referred to as iron ore), and coke are charged alternately, and hot air is blown from a blowing tuyere (hereinafter, simply referred to as tuyere) at the bottom of the furnace to operate. In the blast furnace, the iron ore is heated, reduced (indirectly reduced) and melted during the descent in the furnace by a high-temperature furnace gas containing CO gas generated by a reaction between coke and hot air at the tuyere tip.

[0004] Further, the molten iron ore is reduced (directly reduced) by the coke existing in the dropping zone during the dropping, collected in the pool, and discharged from the taphole out of the furnace at an appropriate time. This iron ore is in a softened and fused state (hereinafter simply referred to as a cohesive zone) immediately before being dropped by melting, and is present in the furnace with coke interposed therebetween.

As described above, in the blast furnace, there are a massive zone in which the charged iron ore is in a massive state, a fusion zone in a softened and fused state, and a dripping zone in a molten dripping state. The gas in the furnace is discharged from the tuyere tip to the outside of the furnace through the dripping zone, the fusion zone, and the lump zone in order. The airflow resistance of the three members is the largest in the fusion zone, followed by the massive band, and the smallest in the dripping zone. Therefore, depending on the shape of the cohesive zone, the shape of the lump zone and the shape of the dripping zone are different, and the gas permeability and the gas permeability in the furnace are different.

For example, in a so-called central flow type cohesive zone in which the top of the cohesive zone is high, the lump zone is narrow, but the dripping zone is wide, so that the air permeability is good and the gas in the furnace is at the core. In order to stabilize the gas flow
Gas utilization can also be maintained at a high level. In a so-called flat type fusion band in which the top of the fusion band is low,
While the lump band becomes wider, the drip zone becomes narrower, so the gas permeability deteriorates, and the gas in the furnace may drift.
Gas utilization may be reduced.

[0007] The permeability and the gas utilization rate have a deep relationship with the productivity and the fuel ratio. If the position and shape of the cohesive zone are detected during the operation of the blast furnace, the cohesive zone can be controlled accordingly. In addition, it is possible to adjust the air permeability and the gas utilization rate to an optimum state, thereby increasing the productivity and reducing the fuel ratio.

Several inventions have been disclosed as methods for controlling the cohesive zone in such a blast furnace. For example, according to the technique disclosed in Japanese Patent Publication No. 63-61367, one or a plurality of sondes are inserted into the furnace from the abdomen or lower part of the blast furnace, and gas obtained from the sondes is inserted. From the information on the measured values of the solid temperature and the gas composition, the upper and lower positions of the cohesive zone are determined, and iron ore in the radial direction of the blast furnace is determined so that the position of the cohesive zone occupies the optimum position for blast furnace operation. Ratio of stone layer thickness to coke layer thickness (O / C)
And the particle size distribution is controlled.

That is, it is said that an appropriate cohesive zone can be obtained by controlling the O / C distribution of iron ore and coke charged into the blast furnace as control of the cohesive zone.
The reason is that the iron ore layer has a smaller particle diameter and a smaller voidage of the layer than the coke layer, so gas permeability is poor in the relatively thick part of the iron ore layer in the radial direction of the blast furnace. The gas flow rate and gas flow rate flowing through that portion decrease. Thus, a decrease in the gas flow rate affects various aspects. For example, in terms of heat transfer, the amount of sensible heat flowing through the unit cross-sectional area decreases, and the heat transfer to solids deteriorates. In addition, regarding the reaction, the concentration of the reducing gas for reducing the iron ore decreases, and a sufficient amount of gas is not supplied, so that the reduction driving force is weakened, thereby causing a relative reduction in the reduction rate.

From the above, the portion where the O / C is high in the radial direction has a low gas / solid temperature, which leads to a reduction in the reduction rate. Therefore, for example, in order to realize a high cohesive zone at the center, it is necessary to supply sufficient heat to the center at the lower part of the furnace. For that purpose, it is necessary to increase the gas supply to the center of the furnace, that is, to reduce the O / C at the center, and to realize a high cohesive zone at the periphery, for the same reason, It is stated that an operation for reducing the O / C of the unit is required.

However, according to a conventional method of charging a blast furnace charge, for example, as shown in FIG.
If (C) and iron ore 3 (O) are sequentially charged in layers, the tendency of the iron ore charging layer being thick and the coke charging layer being thin at the center of the furnace cannot be avoided.
This is because the iron ore has a smaller angle of repose than the coke, and the bulk density of the iron ore and the coke is significantly different. A phenomenon occurs in which the iron ore layer becomes inevitably thick in the center. Therefore, at the center of the furnace, the gas flow supplied from the lower part of the furnace has poor air permeability in the thick part of the iron ore in the center of the furnace, and as a result, the gas flows toward the furnace peripheral part where the flow is relatively easy, and the gas flows there. Will flow.

A technique for charging coke only to the central portion of the blast furnace by a special means in order to keep the chimney-like coke accumulated state in the central portion of the furnace in response to such a distribution state of the charged material. Is disclosed, for example, in Japanese Patent Publication No. 6-37649. If the technology described in the publication is applied to blast furnace operation, it should be possible to easily produce a coke chimney in the center of the furnace. In some cases, the air permeability of the core part becomes excessively large in the coke layer, and the rising gas flow from the downward direction is too strong to blow up coke that is going to be deposited in a chimney shape, and as shown schematically in FIG. Scattered around the periphery, and in some cases, the desired effect of charging the central part of the coke could not be obtained.

[0013]

As described above, an appropriate shape of the cohesive zone is known, and as shown in FIG. It is an ideal shape for the current blast furnace operation. For this purpose, as described above, it is necessary to reduce the O / C at the center of the furnace. In other words, it is preferable to employ a method of charging the charge such that the coke amount at the center of the furnace is as large as possible. That is.

In an actual blast furnace, the ideal charge distribution state of the charge (iron ore, coke, etc.),
In order to obtain a distribution state in the blast furnace radial direction for maintaining / C, charging equipment suitable for the distribution state is required. However, in the case of a bellless blast furnace, it is possible to perform the charging of the charged material to obtain the above-mentioned distribution state, but it is necessary to move the tilt angle of the swiveling chute over a wide range. Under the current blast furnace operating conditions, which are oriented to the pig ratio, there is a problem that it takes too long to charge the charge into the furnace, and the required radial distribution of O / C is created. Sometimes things went wrong.

As described above, the coke charged into the furnace center is affected by the gas flow ascending in the furnace center. Therefore, an appropriate charging method is adopted in consideration of the countermeasures. If not, there is a possibility that the intended charging distribution state may not be obtained, and all these points are summarized, and the tilting angle of the turning chute does not move over a wide range, and no special charging equipment is required. There has been a strong demand for the development of a charging technique capable of easily and easily obtaining the O / C distribution state in the furnace radial direction as described above with the charging equipment described above.

[0016]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and employs the following means. (1). Upon charging the charge in the bellless blast furnace to the interior of the blast furnace, after charging coke into the lower part of the furnace hopper immediately above the blast furnace, and then charging iron ore into the upper part, iron ore and coke are layered in the furnace hopper. A method of charging the blast furnace with the blast furnace in which the shut-off valve is opened after the storage and the charge is charged into the blast furnace via the swirling chute. (2). In order to sequentially charge the charge into the blast furnace through the swirl chute, the charge is started from near the center of the blast furnace, and the swirl chute is sequentially moved in the direction of the blast furnace wall while the blast furnace wall is moved. (1) The method of charging a blast furnace according to (1), wherein the charging is completed on the side and a mixture layer of coke and iron ore is formed in the blast furnace.

(3). When sequentially charging the charge into the blast furnace through the swirling chute, charging is started from the intermediate portion of the blast furnace, and the swirling chute is sequentially moved in the direction of the blast furnace wall to load the charge on the blast furnace wall side. (1) The method for charging a charge into a blast furnace according to (1), wherein charging is completed and a mixture layer of coke and iron ore is formed in the blast furnace. (4). In the above (2), to the blast furnace in which the vicinity of the center of the blast furnace where the charging of the charge is started is in the blast furnace furnace radial direction and the distance from the furnace center to the furnace wall is less than 0.2 with respect to the furnace port radius. How to charge the charge. (5). In the above (3), the intermediate portion at which the charging of the charged material is started is set in a range of 0.2 to 0.4 with respect to the furnace opening radius between the furnace center and the furnace wall in the blast furnace furnace opening radial direction. How to charge the charged blast furnace.

(6). The charging of the charge of the above (2) or (4) is alternately performed with the charging of coke, and the charging of the charge into the blast furnace is performed in the blast furnace, in which the coke and the mixture form a two-layer continuous charged layer. Method. (7). The charging of the charge according to any of the above (2) to (5) is performed next to the charging of iron ore and the charging of coke,
A method of charging a blast furnace in which three continuous layers are formed with iron ore, coke, and a mixture in a blast furnace. (8). The charging of the charge (2) or (4) is performed after the charging of coke and the charging of iron ore, and the blast furnace for forming a three-layer continuous charging layer with coke, iron ore and the mixture in the blast furnace. How to charge the charge to the.

(9). The charging of the charge of (2) or (4) is performed between the charging of iron ore and the charging of coke, and a three-layer continuous charging layer is formed with the iron ore, the mixture, and the coke in the blast furnace. To charge the blast furnace. (10). When storing coke and iron ore in a layered manner in the furnace top hopper, change the ratio of iron ore amount and coke amount in the furnace top hopper and charge the blast furnace with any of (1) to (9). 2. A method for charging a charge into a blast furnace according to (1).

(11). The method according to any one of (1) to (10), wherein when storing coke and iron ore in a layered manner in the furnace top hopper, the particle size of the coke stored in the furnace hopper is changed and charged into the blast furnace. How to charge the blast furnace. (12). When coke and iron ore are stored in layers in the furnace top hopper, coke stored in the furnace hopper is changed to low-reactivity coke and charged into the blast furnace (1) to (11). A method for charging a charge into a blast furnace as described in the crab. (13). When coke and iron ore are stored in layers in the furnace top hopper, pellets and scrap are mixed with the sintered ore and charged into the blast furnace as the iron ore stored in the furnace hopper (1) to ( 12) A method for charging a charge into a blast furnace according to any one of 12).

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION The present inventors have studied the charged state of a charge in a blast furnace from various directions. As described above, the coke charged in the center of the blast furnace has a low specific gravity,
In addition, because of its low bulk density, it is sometimes blown up and scattered by the rising gas flow from the lower part of the furnace, so that a gap is formed between the coke and iron ore having a high specific gravity enters the gap (iron ore has a repose angle of repose). It was found that there was a risk that there would be a problem in obtaining a desired coke deposition layer in the center of the furnace.

In order to appropriately adjust the O / C in the blast furnace radial direction in the blast furnace charge in the control of the cohesive zone in the blast furnace, the present inventors have adopted a conventional method without using a special charging device. After conducting a lot of studies to make use of the charging equipment of this type, it was found that the bellless blast furnace can be easily implemented by devising the storage of the charging material in the top hopper. And succeeded in developing the present invention.

The technical idea that forms the basis of the present invention is that blast furnace charges such as coke and iron ore are stored in layers in a hopper immediately above the blast furnace furnace top. By inserting a predetermined amount (stored amount) into a predetermined position via the inner turning chute,
A charge layer of a charge having a / C distribution state is formed in a blast furnace.

Hereinafter, the present invention will be described in detail with reference to the drawings. In order to obtain a target charge layer, in a bellless blast furnace as shown in FIG. 1, coke 2 is first stored in a lower part of a top hopper 1 immediately above a blast furnace top, and then iron ore 3 is stored thereabove. Is stored in the form of a layer, the shut-off valve at the lower part of the hopper is opened, and the hopper is charged into the blast furnace via the swirling chute 10 in the blast furnace. If the charging into the blast furnace is in the state of being stored in the top hopper 1 as shown in FIG. 1, the coke 2 drops from the top hopper 1 first and reaches the swirling chute 10. Therefore, at the beginning of charging, only coke 2 is charged into the furnace, then a mixture 4 of coke and iron ore is charged, and finally iron ore 3 is charged.
Only input is performed.

That is, if the position of the revolving chute 10 is set to move to a target position in accordance with the falling time of the charge, the type of the charge (coke 2 alone, coke 2 and iron ore 3 Depending on the mixture 4 (m) and the iron ore 3 alone), it is possible to selectively carry out charging a required amount to a required position.

However, if it is desired to obtain the inverted V-shaped fusion zone 9 having a preferable shape as described above, the turning chute 1
From the state where the setting position of 0 is set at less than 0.2 with respect to the furnace opening radius in the furnace radial direction at or near the center of the furnace, the furnace top hopper shutoff valve is opened, and the stored material in the furnace top hopper 1 is removed. As it is dropped, the position of the swirling chute 10 is sequentially moved toward the furnace wall 8 to complete the charging on the furnace wall 8.
It is possible to charge only the coke 2 in the center of the furnace, the mixture 4 (m) of the coke 2 and the iron ore 3 toward the furnace wall, and the iron ore 3 only on the furnace wall 8 side (hereinafter, referred to as “the coke 2”). The charge layer charged by such charging is mixed with the mixture layer 7.
(M)).

In the technique of charging the charged material from the vicinity of the center of the furnace as in the present invention, the effect of the particle size segregation of the charged material (the peripheral particle size is small and the particle size increases toward the center) cannot be used. As a result, coke can be reliably charged into the center of the mixture layer. Mixture layer 7 (M) charged in this way
FIG. 3 shows an example of the distribution in the furnace radial direction from the center of the furnace to the furnace wall.
(M), so that the coke layer 5
Even if the layer thickness of (C) is thin and the layer thickness of iron ore layer 6 (O) is thick, the distribution state of coke 2 as a whole is smaller than that of the conventional ordinary charging method shown in FIG. It can be seen that a relatively large amount of coke 2 is charged in the center of the furnace.

As described above, when the rising gas flow from the lower part of the furnace at the center of the furnace is strong, the charging is continued while the position of the swirling chute 10 is sequentially moved toward the furnace wall during the charging. Then, the charging start position of the mixture 4 (m) is started in the furnace radial direction from the middle part of the furnace in the range of 0.2 to 0.4 with respect to the furnace opening radius (FIG. 3). After that, the iron ore 3 is charged and placed in the upper portion of the mixture for the next charging, so that the mixture 4 (mainly composed of coke) of the mixture starting portion of the mixture layer 7 (M) is iron ore. Utilizing the flow of the stone 3 in the core direction, the mixture 4 (m) is pushed into the furnace center, and a chimney-like charge layer mainly composed of coke can be formed in the furnace center.

That is, the coke layer 5 is located at the center of the furnace.
(C) fluidized coke 2 (as described above, the coke present in the center of the furnace is continuously fluidized by the gas flow rising in the center of the furnace and repeatedly rising and falling, so that it is in a fluidized state). Since the mixture mixed with the iron ore 3 is in a deposited state, if such a charge layer can be secured, a desired air-permeable chimney can be formed in the center of the furnace at the center of the furnace. Can also. When the iron ore 3 is charged, if the charging is not completed at a position which does not exceed the charging position of the mixture 4 (m) charged at the lower part, the iron ore 3 is naturally charged. (M), a large amount of iron ore 3 is charged into the furnace center, and the desired effect cannot be obtained.

The charging of the mixture layer 7 (M) into the blast furnace is appropriately combined during the normal charging, and the charging mode is determined by various patterns. Can be considered. For example, the patterns are listed in Table 1. In the pattern, charging of coke 2 and mixture 4 is performed alternately. In this case, the predetermined O
In order to maintain / C, the thickness of the coke layer 5 (C) is reduced, or the iron ore 3 in the mixture layer 7 (M) is increased to secure an appropriate amount of O / C in the whole charge. There is a need. Also,
In the pattern, the charge of the mixture layer 7 (M) was added in addition to the charge of the normal iron ore layer 6 (O) and the coke layer 5 (C). C does not need to be changed much. Further, the pattern is a mixture layer 7 (M).
The iron ore layer 6 (O) and the coke layer 5 (C) are respectively incorporated between the charging of the mixture layer 7 (M) and the O / C in the mixture layer 7 (M) is almost changed also in this case. No need.

In the above-mentioned pattern, a charging method in which the charging of the mixture layer 7 (M) is started from the furnace intermediate portion can be applied. That is, when the charging method is adopted, the iron ore 3 to be charged next time is placed above the mixture layer 7 (M), and the iron ore layer 6 (O) is always positioned above the mixture layer 7 (M). Therefore, the coke flows into the furnace center due to the collapse of the coke caused by the iron ore 3 due to the specific gravity difference between the iron ore 3 and the coke 2. This means that after charging the mixture layer 7 (M) in the pattern, the next charging was the iron ore layer 6
In the case of (O), the same effect can be expected, and therefore, the present invention can be applied only to the above-mentioned charging mode.

[0032]

[Table 1]

The above-mentioned patterns do not show all the patterns of the charging order, but are merely provided to assist the understanding of the present invention. In the blast furnace operation, the mixture layer is formed according to the condition of the cohesive zone 9. Charge 7 (M) 1-2 in 1 charge
It is possible to freely select and carry out the operation at a rate of once or several charges. The O / C of the blast furnace charge is determined by the operation of the blast furnace, and the O / C in the furnace hopper in the above example is determined.
Of course, the appropriate O / C should be determined in consideration of the value of O / C in the whole charge.

In the present invention, the charging start position of the mixture 4 (m) to be charged is set near the center of the furnace and the middle of the furnace.
In the case of the vicinity of the furnace center, the range is less than 0.2 with respect to the furnace opening radius in the furnace radial direction. When the gas ascending flow in the central part of the furnace is relatively weak and the scattering of coke is predicted to be small, the charging can be performed in a normal charging state. In the case of the furnace middle part, the range is 0.2 to 0.4 with respect to the furnace opening radius in the furnace radial direction. This is affected by the upward flow of gas in the center of the furnace,
This is a value indicating a range set to avoid the influence.

The particle size of the coke 2 in the mixture 4 stored in the furnace top hopper is selected in consideration of the balance with the iron ore 3, the proper particle size is maintained, and the distribution of the coke 2 in the mixture 4 is predetermined. Try to be within the range. Furthermore, the coke 2 does not require high-reactivity coke in view of its reactivity, and medium-reactivity or low-reactivity coke can be sufficiently used. Furthermore, it is also possible to use a mixture of sintered ore and pellets and scrap as the iron ore 3.

[0036]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to an actual blast furnace will be described below. The operated blast furnace has an inner volume of 3280
This is a blast furnace in which pulverized coal having m ³ is being injected. Table 2
In this blast furnace, the storage state and O / C of the blast furnace charge in the furnace top hopper according to the present invention are shown, as well as the charge pattern of the charge and the O / C of the preceding charge. In addition, the results of the implementation of the present invention showed the effect by using the gas utilization rate at the central part of the sonde of the shaft as a scale. These are all 7
The same charging method was continued for a day, and the numerical values in Table 2 represent the average values during the period.

[0037]

[Table 2]

The working numbers 1 to 4 are carried out according to the embodiments of claims 2 and 4 with respect to the charging pattern ~, and the working numbers 5 to 7 are carried out according to the embodiments of claims 3 and 5. In addition, for the execution numbers 8 to 10, the particle size of the coke stored in the furnace top hopper and the use of low-reactivity coke, and the sinters, pellets, scraps, and the like as the iron ore stored in the furnace hopper were performed. As for the execution number 11, a conventional example is given for comparison. As is clear from Table 2, according to the present invention, as a result that a good cohesive zone was obtained more stably than the conventional example, the blast furnace operation was stabilized, and a high tapping ratio could be secured. Was.

[0039]

As described above, by performing the charging method of the present invention, the distribution of iron ore and coke in the blast furnace charge can be arbitrarily and appropriately formed in the radial direction of the furnace. As a result, it is possible to stably obtain the optimum shape of the cohesive zone in the blast furnace, so that a stable peripheral gas flow can be formed in the circumferential direction in the blast furnace.

[Brief description of the drawings]

FIG. 1 is a diagram showing a state of storing a charge in a furnace top hopper according to the present invention.

FIG. 2 is a view showing an example of an inverted V-type cohesive zone in a blast furnace.

FIG. 3 is a view showing the shape of a charge layer of a charge obtained by the charge method of the present invention.

FIG. 4 is a diagram showing shapes of an iron ore layer and a coke layer in a normal blast furnace charging.

FIG. 5 is a diagram schematically showing the state of coke charged in the center of the furnace when the rising gas flow in the center of the furnace is large.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Furnace top hopper 2 Coke 3 Iron ore 4 Mixture (m) 5 Coke layer (C) 6 Iron ore layer (O) 7 Mixture layer (M) 8 Furnace wall 9 Cohesive zone 10 Rotating chute

Claims (13)

[Claims] When charging the charge in a bellless blast furnace into a blast furnace interior, coke is charged into a lower part of a furnace top hopper immediately above the blast furnace, and then iron ore is charged into the upper part thereof. A method for charging a blast furnace with a charge, characterized in that after storing iron ore in layers, a shutoff valve is opened and a charge is charged into the blast furnace via a swirling chute. 2. When the charge is sequentially charged into the blast furnace through the swirling chute, charging is started from near the center of the blast furnace, and the swirling chute is sequentially moved toward the blast furnace wall. 2. The method for charging a blast furnace according to claim 1, wherein the charging is completed on the blast furnace wall side while the mixture is being formed, and a mixture layer of coke and iron ore is formed in the blast furnace. 3. When the charge is sequentially charged into the blast furnace through the swirling chute, charging is started from an intermediate portion of the blast furnace, and while the charging chute is sequentially moved toward the blast furnace wall. 2. The method of charging a blast furnace according to claim 1, wherein the charging is completed on the blast furnace wall side, and a mixture layer of coke and iron ore is formed in the blast furnace. 4. The blast furnace according to claim 2, wherein the vicinity of the center of the blast furnace at which charging of the charged material is started is in the radial direction of the blast furnace furnace port, and 0.2 mm from the furnace center to the furnace wall with respect to the furnace port radius. A method for charging a charge to a blast furnace, wherein 5. The blast furnace according to claim 3, wherein the intermediate portion at which the charging is started is 0.2 to 0 with respect to the furnace radius from the furnace center to the furnace wall in the blast furnace furnace radial direction. 4. A method for charging a charge into a blast furnace, characterized in that the range is set to 4. 6. The charging of the charge according to claim 2 or 4 is alternately performed with the charging of coke, and the coke and the mixture form a two-layer continuous charging layer in the blast furnace. How to charge the blast furnace. 7. The charging of the charge according to any one of claims 2 to 5 is performed after the charging of iron ore and the charging of coke, and the charging of iron ore, coke, and the mixture is performed in a blast furnace. A method for charging a charge into a blast furnace, comprising forming a continuous charge layer of layers. 8. The charging of the charge according to claim 2 or 4 is performed after the charging of coke and the charging of iron ore, and the continuous charging of three layers of coke, iron ore, and the mixture is performed in the blast furnace. A method for charging a charge to a blast furnace, comprising forming a layer. 9. The charging of the charge according to claim 2 or 4 is performed between the charging of iron ore and the charging of coke, and the iron ore, the mixture, and the coke are continuously formed in a three-layer structure in the blast furnace. A method for charging a blast furnace with a charge, comprising forming a charge layer. 10. When the coke and the iron ore are stored in a layer in the furnace top hopper, the ratio between the iron ore amount and the coke amount in the furnace top hopper is changed and charged into the blast furnace. A method for charging a blast furnace according to any one of claims 1 to 9. 11. The method according to claim 1, wherein when coke and iron ore are stored in layers in the furnace top hopper, the particle size of the coke stored in the furnace top hopper is changed and the coke is charged into the blast furnace. A method for charging a charge into a blast furnace according to any one of claims 10 to 10. 12. When coke and iron ore are stored in layers in a furnace top hopper, coke stored in the furnace hopper is changed to low-reactivity coke and charged into a blast furnace. The method for charging a blast furnace according to any one of claims 1 to 11, wherein the method comprises the steps of: 13. When coke and iron ore are stored in layers in a furnace top hopper, pellets and scrap are mixed with sinter and charged into a blast furnace as iron ores to be stored in the furnace top hopper. Claim 1 or Claim 1 characterized by the above-mentioned.
3. A method for charging a charge into a blast furnace according to any one of 2.