JPH0633120A - Method for charging sintered ore into blast furnace - Google Patents

Abstract

PURPOSE:To efficiently use powdery sintered ore without needing large scaled equipment, lowering charging capacity and bringing about any trouble to gas flow in a blast furnace. CONSTITUTION:A shield plate 2 is arranged on a screen B of each of ore storing vessels A1-A6 so as to be freely inserted and pulled out by a cylinder 1. By inserting/pulling the shield plate 2 into or out of the sintered ore segmented from the ore storing vessels A1-A6 according to the gas flow in the blast furnace, the layer of the sintered ore in an ore surge hopper is separated into the screened layer and the non-screened layer to be is store as the each layer and segmented out and charged into the blast furnace.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for charging sinter to a blast furnace, and more particularly to a method for charging sinter to a blast furnace for controlling gas flow in the blast furnace. Is.

[0002]

2. Description of the Related Art Movable armor is conventionally used in bell-type blast furnaces as a means for controlling the gas flow in the furnace in blast furnaces.
In the bellless type blast furnace, the chute inside the furnace is known,
These control means have been used to control the gas flow in the furnace by controlling the charging position of the sinter or the like charged into the blast furnace.

On the other hand, in recent years, for the purpose of reducing the raw material cost of the blast furnace,
Attempts have been made to use powdered ore (particle size 5 mm or less) that could not be used in the blast furnace in the past, but charging of powdered ore generally deteriorates the air permeability in the blast furnace, so the air permeability is low. In order to minimize the deterioration of sinter, powdered ore and agglomerated ore are separately managed and charged into the blast furnace, so-called sorting according to particle size.

FIG. 4 is an explanatory diagram showing a flow of sorting and charging according to the grain size. Sinter ore S stored in storage tanks A1 to A6
Is sieved by a sieve B provided under each of the storage tanks A1 to A6 and divided into a lump sinter ore SL and a powder sinter SS, and the lump sinter SL is transferred to a ore surge hopper F1 by a conveyor C. Sent and stored. On the other hand, a part of the powder sinter ore SS is stored in the storage hopper E by the conveyor D and a part is returned to the sintering factory for re-sintering. Powder sinter stored in storage hopper E
The SS is cut out to the conveyor C at another timing and sent to the ore surge hopper F2 for storage. Thus, the lump sinter ore SL stored in the ore surge hopper F1 and the powder sinter ore SS stored in the ore surge hopper F2 are separately cut out on the charging conveyor G, and the lump sinter ore SL is a large bell. The powder sinter ore SS is separately supplied onto the small bells H on the I, and then charged into the blast furnace J sequentially from the respective bells I and H.

[0005]

In the above-described method of sorting and charging according to particle size, the powdered sinter is efficiently put into the blast furnace while controlling the gas flow in the blast furnace by the conventionally used moveable armor or the chute in the furnace. Although there is an effect that SS can be charged, a storage hopper E for storing the powdered sinter ore SS is provided, and a conveyor for conveying the powdered sinter ore SS is separately provided to the storage hopper E, or It is necessary to provide sieving equipment on the storage hopper E, and the equipment becomes large-scale. Also, since the lump sinter SL and the powder sinter SS are separately charged into the blast furnace, the required number of times of charging increases, and the charging capacity is increased.
Since (ton / day) decreases, there is a problem that it impedes the production amount of hot metal.

The present invention has been made in view of the above problems, and its purpose is not to require large-scale equipment, to reduce charging capacity, and to hinder gas flow in a blast furnace. The present invention provides a method for charging a sinter ore into a blast furnace, which enables the use of the powder sinter without any need.

[0007]

In order to achieve the above object, a method for charging sinter into a blast furnace according to the present invention is a method of sintering stored in a plurality of storage tanks arranged in a row. In a method in which ore is sieved and charged from the top of the blast furnace through a ore surge hopper by a transfer device, a shielding plate is provided on the sieve of each storage tank so that it can be freely inserted and removed, and the storage tank is installed according to the gas flow in the blast furnace. By removing and inserting a shield plate from the sintered ore cut out from the layer, the layers of the sintered ore in the ore surge hopper are divided into the layer with the sieve and the layer without the layer, stored and cut out and charged into the blast furnace. To do.

[0008]

With the above construction, a storage tank which has been conventionally used only by providing a device for removing and inserting the shield plate on the sieve,
The powder sinter can be used by a conveyer conveyor, an ore surge hopper, a charging conveyor, etc., and the raw material cost can be reduced by using the powder sinter without installing large-scale equipment. In addition, when cutting out the sintered ore from the storage tank on the conveyor,
By simply inserting and removing the shield plate, sinter ore containing powdered sinter and sinter not containing powdered sinter can be screened, so it can be screened according to the gas flow in the blast furnace and inside the ore surge hopper. By storing and slicing in the blast furnace, it is possible to use the powder sinter efficiently without disturbing the gas flow in the blast furnace.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram of equipment applied to a method for charging sintered ore into a blast furnace according to the present invention. The same reference numerals in the drawings denote the same parts as those shown in the prior art.

In the figure, A1 to A6 are storage tanks, B is a sieve,
C is a conveyor, D is a conveyor for powdered ore, F1,
F2 is an ore surge hopper, G is a charging conveyor, H is a small bell, I is a large bell, J is a blast furnace, and a cylinder 1 is installed on the side frame of the sieve B as shown in FIG. B
A shield plate (steel plate) 2 slidably provided on the upper surface of the is connected so as to be removed and inserted.

In the equipment for charging the sinter to the blast furnace,
As shown in FIG. 1a, the sieve B below the storage tanks A1 and A2 is shielded by the shield plate 2 by operating the cylinder 1, and the other storage tanks A3
~ A6 keeps the shield plate 2 open. As a result, the sinter ore cut out from the storage tanks A1 and A2 on the conveyor C remains the mixture of the lump sinter SL and the powder sinter SS, and the storage tanks A3 to A6. The sinter ore cut out from is only lump sinter SL. When the ore surge hoppers F1 and F2 are stored by driving the conveyor C to store the sinter ore cut out in this way, in the ore surge hoppers F1 and F2, the lump sinter ore SL is at the bottom and the sinter ore is at the top. The lump sinter SL and the powder sinter SS are layered and stored. After this, ore surge hopper F1, F2
It is cut from and sent to small bell H and large bell I of blast furnace J, respectively.

The sintered ore fed as described above is kept stratified in the ore surge hoppers F1 and F2 on the small bell H and the large bell I, so that the small bell H and the large bell I are kept. When charged into a higher blast furnace, the lower mass sinter that is charged first
SL is first deposited in the shape of a mortar near the furnace wall, and the lump sinter ore SL and powder sinter SS in the upper part that are charged later are rolled down on the lump sinter SL that has been deposited in the mortar shape. Deposit near the center of the furnace. When the powdered sintered ore SS is charged near the center of the furnace in this way, the air permeability at the center of the furnace deteriorates, and the gas flow distribution shown by the dotted line in FIG. 3 is obtained.

On the other hand, the operating position of the shield plate 2 of the sieve B below the storage tanks A1 to A6 is set to A5 and A6, for example, as shown in FIG. 1b.
If the sinter is stored in the ore surge hoppers F1 and F2, conversely to the above, the lump sinter SL and powder sinter SS are at the bottom and the lump sinter SL is at the top. Since they are stored stratified, the state of charging into blast furnace J after this is also reversed, and the lower lump sinter ore SL and powder sinter SS that are initially charged are first placed near the furnace wall. An agglomerate sinter in the upper part that is deposited in a mortar shape and is charged later
SL is a lump sinter SL and powder sinter SS that are deposited in the shape of a mortar.
Rolls down and deposits near the center of the furnace. When the sinter ore SL is charged near the center of the furnace in this way, the air permeability at the center of the furnace is improved and the gas flow distribution shown by the solid line in FIG. 3 is obtained.

In the sinter charging equipment for the blast furnace, the gas flow in the blast furnace J can be controlled by changing the shielding position of the sieve B under the storage tanks A1 to A6 as described above. Therefore, by changing the shielding position of the sieve B according to the gas flow state in the blast furnace J, an appropriate gas flow distribution in the blast furnace J can be obtained, and stable operation of the blast furnace J reduces the fuel ratio from the original. At the same time, the raw material cost can be reduced by using the powder sinter SS.

In the above embodiment, the case where the sintered ore is cut out from all of the storage tanks A1 to A6 at the same time has been described.
The present invention is not limited to this, and, for example, the storage tanks A1 to A6 are cut out for each storage tank and the sieve B below it is cut out.
May be inserted and removed, and a mixed layer of the agglomerated sinter SL and the powdered sinter SS and a layer of only the agglomerated sinter SL may be sequentially controlled and cut out.

[0016]

As described above, according to the method for charging sinter to the blast furnace according to the present invention, only a device for inserting and removing the shield plate on the sieve is provided and no large-scale equipment is provided. Raw material costs can be reduced by using powdered ore. In addition, when cutting out the sintered ore from the storage tank on the conveyor,
By simply inserting and removing the shield plate, sinter ore containing powdered sinter and sinter not containing powdered sinter can be screened, so it can be screened according to the gas flow in the blast furnace and inside the ore surge hopper. By storing and slicing in the blast furnace, it is possible to use the powder sinter efficiently without disturbing the gas flow in the blast furnace.

[Brief description of drawings]

FIG. 1 is a schematic diagram of equipment applied to a method for charging a sinter to a blast furnace according to the present invention, in which a is a schematic diagram showing one embodiment and b is a schematic diagram showing another embodiment.

FIG. 2 is an explanatory view of a mounting state of the shielding plate according to the present invention.

3 is a gas flow distribution diagram in the blast furnace corresponding to the embodiment shown in FIG. 1. FIG.

FIG. 4 is an explanatory view of a method for charging a sinter ore into a conventional blast furnace.

[Explanation of symbols]

1: Cylinder 2: Shield A1
~ A6: Storage tank B: Sieve C: Conveyor conveyor D: Conveyor conveyor for powder sinter ore F1, F2: Ore surge hopper G: Conveyor conveyor H: Small bell
I: Large bell J: Blast furnace SL: Sintered ore S
S: Sintered powder

Claims (1)

[Claims] 1. A method in which sinter ore stored in a plurality of storage tanks arranged in a line is sieved and charged from a top of a blast furnace through a ore surge hopper by a conveying device, and the sinter is placed on the sieve of each storage tank. A shield plate can be freely inserted into and removed from the blast furnace, and the shield plate is removed from the sinter ore cut out from the ore storage tank according to the gas flow in the blast furnace to screen the layer of sinter ore in the ore surge hopper. A method for charging sinter into a blast furnace, which comprises storing the layer into a layer that has been applied and a layer that has not been applied, storing the layer, and cutting the layer into a blast furnace.