KR101337108B1 - Stave and blast furnace - Google Patents

Abstract

The shaft stave is a stave provided on an inner circumference of the shaft portion of the blast furnace, and includes a stave body having a reference surface facing the inner space of the blast furnace, and a plurality of protrusions protruding from the reference surface toward the inside of the blast furnace. do.

Description

STAVE AND BLAST FURNACE

This application claims priority based on Japanese Patent Application No. 2010-036841 for which it applied to Japan on February 23, 2010, and uses the content here.

In the existing blast furnace, the structure in which the stave is provided in the inner side of an iron shell and the fire brick was installed in the inside is used a lot. The inner surface of the blast furnace is exposed to a charge that descends the furnace while being subjected to high heat in the furnace, and is subjected to mechanical wear. After the fire bricks are worn out after a certain period of time, the surface of the stave is worn out. In order to cope with such wear and tear, the structure which forms a recessed part in the surface of the inside of a furnace of a stave, and inserts a refractory part into this recessed part (refer patent document 1).

Japanese Patent Application Laid-Open No. 2001-49316

In the blast furnace, at the shaft portion (from the middle of the shaft to the upper portion), the contents are layered granular coke and iron ore (sintered or lump ore), and the stave at this portion is mechanical wear due to the contents of the contents. Receive. For such mechanical wear, the above-mentioned embedding refractory does not necessarily have sufficient durability.

An object of the present invention is to provide a stave and a blast furnace where sufficient durability can be obtained even against mechanical abrasion by particles of a charge.

The present invention is based on the knowledge obtained by the results of the researches of the present inventors, that is, the mechanical wear caused by the particles of the charges depends on the shape, hardness, and falling speed of the particles of the charges, and suppresses the speed of the charges on the surface of the stave. Based on the knowledge that wear can be greatly reduced by forming a stagnant layer. The present invention suppresses the speed of the charges on the surface of the stave based on the above knowledge. As a structure for forming a stagnation layer, protrusions were formed on the surface of the stave inside the blast furnace furnace, thereby making it easier to generate a stagnant layer of the charge covering the surface of the stave. The concrete configuration is as follows.

The present invention solves the above-mentioned problems and adopts the following means in order to achieve this object.

In other words,

(1) The stave which concerns on one form of this invention is a stave provided in the inner periphery of the shaft part of a blast furnace, The stave main body which has a reference surface which faces the internal space of the said blast furnace, and the said inside of the blast furnace from the said reference surface A plurality of protrusions protruding toward each other to suppress the descending speed of the charges are formed, and a groove recessed toward the outside of the blast furnace is formed in the reference plane between the plurality of protrusions of the stave body, and the refractory material is only in the grooves. This is installed.

According to the stave described in (1) above, the furnace surface of the blast furnace is constituted by the reference surface of the stave main body, and the charges descending the furnace are decelerated by the projections projecting from the reference surface into the furnace. As a result, a stagnation layer is formed. The stagnant layer has a lower relative speed with respect to the reference surface of the stave body, thereby reducing the mechanical wear of the reference surface of the stave body due to the particles of the charged material, and sufficient durability is obtained even for the granular charge material that descends the shaft portion of the blast furnace. Lose.

(2) As for the stave as described in said (1), it is preferable that the protrusion dimension of the said protrusion part is 50-150 mm, and the space | interval of the said adjacent protrusion part is 200-700 mm.

According to the stave according to the above (2), since the protrusions (protrusion dimensions: 50 to 150 mm, spacing: 200 to 700 mm) are formed, the charges are decelerated, and in particular, the movement of a part of the charges is stopped by the protrusions. A stagnant layer is formed.

As a result of this stagnation layer, the plane is covered with the stagnation layer, so that the deceleration effect on the charge is enhanced.

In addition, in this present stave, it is a stave with respect to development, a general charge, ie, an ore-type charge of about 8 to 25 mm and a coke-type charge of about 20 to 55 mm that are alternately charged. The stagnation layer tends to be formed along the reference plane of the main body. Thereby, the speed | rate of the charged particle in the surface of a front-end | tip of a projection part can be suppressed, and the abrasion relaxation effect of the whole stave can be exhibited. If the gap is smaller than 200 mm, the recess formed by the adjacent protrusions along the reference plane of the stave body becomes invalid and the contents are less likely to be caught. On the other hand, if the gap is larger than 700 mm, the gap between the stagnant layers is widened and the coating effect is not sufficiently exhibited.

(3) In the stave as described in said (1), it is preferable that the said projection part is provided continuously or intermittently along the circumferential direction of the said blast furnace.

According to the stave according to the above (3), it is easy to appropriately maintain the circumferential balance in the furnace by the projections continuous around the entire circumferential direction, and the operation performance can be maintained satisfactorily.

In addition, the projection may be arranged intermittently (intermittently) in the furnace circumferential direction. In this case, although various geometric patterns, such as a lattice shape and a zigzag shape, can be employ | adopted, it is preferable to set it as the point symmetrical arrangement which considered the circumferential balance necessarily.

(4) As for the stave as described in said (1), it is preferable that the surface of the said projection part is formed with the high hardness material.

According to the stave described in the above (4), it is possible to prevent wear of the projections themselves. In the stave of one embodiment of the present invention, the reference surface of the stave body is reduced in wear by the formation of a stagnant layer guided by the protrusion (self-lining), but the protrusion itself is exposed from the stagnant layer to the inside of the furnace. In some cases, wear caused by the particles of the charged material that is not decelerated may be continuously received. In this case, by forming the surface of the projection part with a hard material, wear of the projection part can be suppressed, and further, a stagnant layer guided by the projection part is formed. Thereby, the wear reduction of the reference surface of the stave main body by the stagnation layer can be stably maintained for a long time.

(5) As for the stave of said (4), the recessed part is formed in the said stave main body,

The protrusion is a block embedded in the recess and protruding from the reference plane,

It is preferable that the block is formed of a high hardness material.

According to the stave according to (5), since the protrusion is provided in the recess formed in the stave main body, that is, the stave main body and the protruding part are separate members, Protrusions can be easily formed.

or,

(6) It is preferable that the said protrusion part is integrally formed with the said stave main body in the stave as described in said (4).

According to the stave according to the above (6), the surface of the projection part made of the above-mentioned high hardness material can be easily performed, and the projection part is formed integrally with the stave body, so that the production is easy. In particular, in the case where the cooling pipe passes through the protrusions, it is very advantageous in processing that the protrusions and the stave main body are integrated.

(7) It is preferable that the said stave main body as described in said (1) is copper or a copper alloy.

According to the stave as described in said (7), the cooling efficiency as a stave used for a shaft part can be improved. While the cooling performance of the stave made of copper or copper alloy is high, it is easy to receive abrasion by the particles of the charge, but the stagnation layer based on one embodiment of the present invention can alleviate the wear of the stave body. Furthermore, high cooling performance can be maintained for a long time.

(8) It is preferable that the stave as described in said (1) is provided with the conduit which cools the said projection part inside the said projection part.

According to the stave according to the above (8), in addition to the usual cooling pipeline provided in the stave main body, it can be directly cooled by the pipeline for cooling the projection, so that the hardness of the surface of the projection can be maintained high, The wear protection effect can be maintained for a long time.

(9) It is preferable that, in the stave as described in said (1), the angle which the side surface and the reference surface of the lower side of the said projection part make | form is less than 90 degree among two opposing side surfaces of the said projection part provided in the both end side of the said reference surface.

According to the stave as described in said (9), since the angle which the side surface of a downward side of a projection part, and a reference surface makes is less than 90 degree | times, it becomes easy to support a charged object by an inclined projection part. Thereby, since it can further suppress that a charge falls below, sufficient durability is acquired also with respect to mechanical abrasion.

(10) The blast furnace according to one embodiment of the present invention includes the stave according to any one of the above (1) to (9).

Here, it is preferable to provide the stave based on one form of this invention in the shaft part of the blast furnace and its periphery, the part where a charged object falls in a granular state.

In such a stave, even if there is a charged material falling in a granular state, a stagnation layer is formed by the projection of the stave, and the abrasion of the reference surface of the stave body is reduced. In the shaft portion of the blast furnace, the wear due to the granular charges progresses, which makes it difficult to operate as a blast furnace.However, the wear-resistant stave is provided in this portion, so that the operation can be performed stably and the life as the blast furnace is maintained. Can be extended.

1 is a schematic diagram showing a blast furnace of a first embodiment of the present invention.
It is sectional drawing which shows the stave of the said 1st Embodiment.
3 is a front view illustrating the stave of the first embodiment.
4A is a perspective cross-sectional view illustrating the stave of the first embodiment.
4B is a perspective cross-sectional view showing a modification of the stave of the first embodiment.
Fig. 5 is a rear view showing the stave of the first embodiment.
It is a schematic diagram which shows the effect | action of the said 1st Embodiment.
It is a schematic diagram which shows the effect | action of the comparative example of the said 1st Embodiment.
It is a schematic diagram which shows the effect | action of the comparative example of the said 1st Embodiment.
9 is a graph showing the test results of the first embodiment.
10 is a graph showing the test results of the first embodiment.
It is sectional drawing which shows the stave of 2nd Embodiment of this invention.
It is a front view which shows the stave of 2nd Embodiment of this invention.
It is a rear view which shows the stave of 2nd Embodiment of this invention.
It is sectional drawing which shows the stave of 3rd embodiment of this invention.
It is a front view which shows the stave of 3rd embodiment of this invention.
It is a rear view which shows the stave of 3rd embodiment of this invention.
It is sectional drawing which shows the stave of 4th Embodiment of this invention.
It is a front view which shows the stave of 4th Embodiment of this invention.
It is a rear view which shows the stave of 4th Embodiment of this invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]

In FIG. 1, the blast furnace 1 has the cylindrical furnace body 2 built on the foundation ground.

The furnace body 2 is cylindrical, and in order from the upper gas collection mantle 3, the furnace port part S1, the shaft part S2, the furnace part S3, the bosh part S4, the ventilation port part S5, and the furnace part S6. Separated by. In general, the inner diameter of the shaft portion S2 extends downward, the inner diameter of the slack portion S3 is the maximum diameter, and the inner diameter of the viewing portion S4 is reduced downward.

In the furnace body 2, the charging device is normally installed in the gas collection mantle 3, and the granular charge 4 is charged into the blast furnace 1 from this charging device. As the charge 4, an ore-based charge having a particle size of about 8 to 25 mm and a coke-based charge having a particle size of about 20 to 55 mm are charged alternately. As a result, the block 4A in which iron ore and coke were laminated alternately is formed in the furnace ball part S1 and the shaft part S2 in a furnace.

The furnace 2 is provided with a tuyere 5 in the upper part of the bottom part S6, and 5 A of hot air blows in from this. The hot air 5A causes the coke in the block 4A to drop down in the furnace and increase the temperature sequentially, and near the blower port 5, a high-speed gas from the raceway 5B (the blower port 5) by hot gas. Blown to form a space having a high porosity in which coke in front of the tuyeres 5 is fluidized. Due to the high heat of the raceway 5B, the iron ore in the block 4A is melted.

These coke combustion and melting of iron ore proceed sequentially in the lower part of the block 4A, and in the blast furnace 1, the substantially conical fusion | melting zone 4B is formed toward the lower part of the shaft part S2 from the borehole part S4.

The iron powder 6A melted in the fusion zone 4B passes through the dropping zone 4C, is dripped toward the bottom section S6, and is stored in the bottom section S6 as the molten iron 6B. The coke or the like falls through the dropping zone 4C and is stacked on the bottom portion S6 to form a conical core 4D on the molten iron 6B.

In the furnace body 2, a tap opening 6 is provided in the bottom part S6, and the molten iron 6B stored in the bottom part S6 by the tap opening 6 is taken out of the blast furnace 1 outside. do.

The furnace body 2 has 2 A of shells in the outermost periphery, and the cooling stave and the refractory brick 2D are affixed inside 2 A of shells.

The shaft stave 2B is attached to the area S7 which faces the block 4A of the intermediate part from the upper part of the shaft part S2. In this region S7, since the granular charges 4 included in the massive 4A fall sequentially while contacting the surface of the stave 2B, when mechanical wear occurs on the surface of the stave 2B. There is.

On the inner circumference of the area S8 including the snorkeling section S3 and the seeing section S4 from the lower portion of the shaft section S2, the seeing section and the slack for stabbing section 2C are attached. In this region S8, since the high-temperature charged material 4 (fusion zone base portion) included in the welding zone 4B drops sequentially while contacting the surface of the stave 2C, the surface of the stave 2C has a high temperature. Wear may occur.

The heat-resistant brick 2D is attached to the inner surface of the blast furnace 1 of these staves 2B and 2C as needed. Moreover, the heat resistant brick 2E is thickly laminated | stacked in the bottom part in which hot molten iron is stored.

In this embodiment, the shaft stave 10 shown in FIG. 2 is employ | adopted as the shaft stave 2B shown in FIG.

2, 3, 4A, 4B and 5, the shaft stave 10 includes a stave main body 11 having a reference plane R facing the inner space of the blast furnace 1; And the plurality of protrusions 12 protruding from the reference plane R toward the inside of the blast furnace 1. In this embodiment, the projection part 12 is formed integrally with the stave main body 11. In addition, the stave main body 11 is a thin plate shape cut out from the plate | board material made from copper or copper alloy. The shaft stave 10 may be cast or cast iron collectively cast from copper or copper alloy.

As shown in FIG.2 and FIG.3, the projection part 12 is continuous horizontally at the surface side of the stave main body 11, and is formed in multiple rows. As shown in FIG. 2, a lower plane 13 is formed between the plurality of protrusions 12. One groove 21 is formed in the plane 13, and the firebrick 15 is fitted into the groove 21.

A refractory castable may be used instead of the refractory brick 15. In addition, the number and place of the grooves 21 are not limited to this.

As shown in FIG. 4A, a plurality of protrusions 12 are continuously arranged horizontally on the surface side of the stave main body 11. 4A is a diagram in which the groove 21 is omitted.

The plane 13 is formed by cutting from the surface of the stave body 11, and the protrusions 12 are formed by being cut and left during this cutting. Here, the plane 13 is the reference plane R of the stave 10 for shafts, and the projection part 12 protrudes from the reference plane R of the stave 10 for shafts.

When the stave 10 for shafts is affixed in the blast furnace 1, the projection part 12 is provided continuously along the circumferential direction of the blast furnace 1, as shown in FIG. 4A, and the blast furnace 1 ), Each of the protrusions 12 forms a complete annular shape.

Moreover, as shown in FIG. 4B, the projection part 12 may be arrange | positioned intermittently (intermittently) along the circumferential direction in the blast furnace 1. In this case, although various geometric patterns, such as a lattice shape and a zigzag shape, can be employ | adopted, it is preferable to set it as the point symmetrical arrangement which considered the circumferential balance necessarily. 4B is a diagram in which the groove 21 is omitted.

Moreover, of the two side surfaces 12a and 12b of the projection part 12 provided in the both end sides of the reference surface R, the side surface below the projection part 12, ie, the angle | corner (theta) which the side surface 12a and the reference surface R make 90 degrees. Is less than. Specifically, when the blast furnace 1 is installed, the side surface 12a is horizontal with respect to the ground which is an installation place.

2, a bolt accommodating portion 11A for mounting to the blast furnace 1 is formed on the back side of the stave body 11. As shown in Fig.

As shown in FIG. 5, the connection ports 16A and 17A of the cooling conduits are formed on the rear surface side of the stave main body 11, and the cooling conduits 16 and 17 are formed inside the stave main body 11. It is.

The pipe line 16 is arrange | positioned along the plane 13, and it is possible to cool the plane 13 which is the reference surface R of the stave 10 for shafts with the cooling water supplied from the connection port 16A.

Moreover, the conduit 17 which cools the projection part 12 is provided in the inside of the projection part 12. As shown in FIG. By this structure, the projection part 12 can be cooled by the cooling water supplied from the connection port 17A.

It is preferable that the front end surface of the projection part 12 is coated with high hardness material, such as TiN, TiC, WC, Ti-Al-N system.

As shown in FIG. 2, the protrusion part 12 of the shaft stave 10 has 50-150 mm of protrusion amount (protrusion dimension) E from the reference surface R (maximum particle size 55 of a coke system charge material with a large average particle size). About 1 to 3 times of mm), the thickness T in the height direction is 50 to 150 mm, and the distance D (corresponding to the height direction dimension of the flat surface 13) with other adjacent protrusions 12 is 200 to 700 mm, Preferably it is 250-350 mm (50 mm before and behind 300 mm).

6-8, the operation | movement of the shaft stave 10 of this embodiment in the space | interval D of the adjacent protrusion part 12 200-700 mm, more than 700 mm, and less than 200 mm is demonstrated. .

Fig. 6 schematically shows a state (protrusion amount E: 50 to 150 mm, interval D: 200 to 700 mm) at the time of operation of the shaft stave 10 of the present embodiment. The enlarged shape of the stave 10 for shafts of this embodiment is typically shown by the upper part of the paper surface of FIG. In addition, the graph of the falling speed V1, V2 in the crossing position P1 and the crossing position P2 in the upper part of FIG. 6 is shown by the lower part of the paper surface of FIG.

In FIG. 7, the case where the space | interval D of the protrusion part 12 is extremely large (the space | interval D> 700 mm of the protrusion part 12) is shown. The enlarged shape of the shaft stave 10 is typically shown by the upper part of the paper surface of FIG. In addition, the graph of the falling speed V3, V4 in the crossing position P3 and the crossing position P4 in the upper part of FIG. 7 is shown by the lower part of the paper surface of FIG.

8, the case where the space | interval D of the projection part 12 is small (interval D <200mm of a projection part) is shown. The enlarged shape of the shaft stave 10 is typically shown by the upper part of the paper surface of FIG. In addition, the graph of the falling speed V5 in the crossing position P5 in the upper part of FIG. 8 is shown by the lower part of the paper surface of FIG.

In each figure, the charged object 4 falls inside the blast furnace 1 (refer FIG. 1) at the time of an operation. The charge 4 in the blast furnace 1 descends at approximately constant speed. In the vicinity of the surface (reference plane R) of the shaft stave 10, the charged object 4 is decelerated by friction with the shaft stave 10. As a result, a low speed region is generated between the stave 10 and the boundary B in the charge 4 near the shaft stave 10. As a result, the falling speed of the charge 4 is substantially constant (average falling speed V0) inside the furnace than the boundary B, but the falling speed is gradually lowered from the boundary B over the reference plane R of the stave 10. The change of the descending speed at this time varies greatly depending on the shape of the reference plane R of the shaft stave 10, that is, the installation state of the projection 12.

As shown in FIG. 6, when the projection part 12 (protrusion amount E: 50-150 mm, space | interval D: 200-700 mm) based on this embodiment is formed, the shaft stave ( In the region up to the reference plane R of 10), the charge 4 decelerates, and in particular, the movement of a part of the charge 4 is stopped by the projection 12 to form the stagnant layers 19 and 18.

The stagnant layers 19 and 18 generate | occur | produce on the upper surface side of the projection part 12 of the shaft stave 10, and grow upwards along the plane 13 which is a reference surface. The movement of the stagnation layer 19 on the inner side is almost stopped, and the stagnation layer 18 on the inner side of the blast furnace 1 is gradually replaced while the descending speed of the stagnation layer 18 is very slow.

As a result of the stagnation layers 19 and 18 being generated, the plane 13 is covered with the stagnation layers 19 and 18, so that the deceleration effect on the charge 4 is enhanced.

Looking at the falling speed V1 in the crossing position P1, in the inside of the blast furnace 1, it is substantially constant at the average falling speed V01. The boundary B is a position of the distance B1 from the reference plane R of the shaft stave 10, and the falling speed V1 decreases from this boundary B to the reference plane R, and becomes the falling speed VW1 at the reference plane R. The falling speed VW1 becomes very slow by the formation of the stagnant layers 19 and 18, whereby the abrasion of the stave body 11 of the stave 10 for shafts is suppressed.

When looking at the falling speed V2 in the crossing position P2, the average falling speed V02 of the inside of the blast furnace 1 is the same as the average falling speed V01 in the crossing position P1, and from the boundary B of the stave 10 for a shaft The rate of descent decreases over the reference plane R. At this time, the falling speed V2 and the falling speed V1 are the same. In the front end surface R1 of the projection part 12, it becomes the falling speed VL2. Here, the distance from the reference plane R to the tip end surface R1 corresponds to the projecting dimension E of the protrusion 12.

The lowering speed VL2 becomes the same as the lowering speed VL1 at the position corresponding to the tip end surface R1 at the crossing position P1. In the transverse position P1, the position of the lowering speed VL1 at the tip end surface R1 is internal at the boundary between the charge 4 of the stagnant layers 19 and 18 formed by the protrusions 12 and the lower charge 4. The friction increases, and the descending speed becomes slow. The falling speed VL2 is affected by the falling speed VL1 and becomes the same falling speed as the falling speed VL1.

As shown in FIG. 7, when the space | interval D of the projection part 12 of the shaft stave 10 is extremely large (interval D> 700mm of a projection part), the boundary B is a reference surface of the stave 10 for shafts It is a position of distance B3 from R, and the deceleration of the charged object 4 arises in the area | region from this boundary B to the reference plane R. As shown in FIG. However, with respect to the stagnation layers 19 and 18 by the projection part 12 like FIG. 6, it forms only in the lower end part of the height W, not forming over the whole range of the height W of the recessed part.

Looking at the lowering speed V3 in the crossing position P3, the average lowering speed V03 inside the blast furnace 1 is the same as the average lowering speed V01 in the crossing position P1, and from the boundary B of the stave 10 for the shaft The rate of descent decreases over the reference plane R. At this time, as in the falling speed V1, the falling speed decreases, but since the space | interval D of the projection part 12 is extremely large, the influence of the stagnant layers 19 and 18 on the plane 13 is small, and the falling speed of the plane 13 is It becomes the frictional force of the plane 13 and the charge 4. As a result, when the space | interval D of the protrusion part 12 of the shaft stave 10 is extremely large, a fall speed does not decrease very much.

When looking at the falling speed V4 in the crossing position P4, the average falling speed V04 of the inside of the blast furnace 1 is the same as the average falling speed V03 in the crossing position P3, and from the boundary B of the stave 10 for a shaft The rate of descent decreases over the reference plane R. At this time, similarly to the falling speed V3, the falling speed decreases, but becomes the falling speed VL4 at the front end surface R1 of the projection 12. Here, the distance from the reference plane R to the tip end surface R1 corresponds to the projecting dimension E of the protrusion 12.

The falling speed VL4 becomes faster than the falling speed VL3 at the tip end surface R1 at the relative position at the crossing position P3. In the cross section from the boundary B of the crossing position P3 to the reference plane R and in the cross section from the boundary B of the crossing position P4 to the tip end surface R1, the cross section of the crossing position P4 is smaller. That is, since the distance from the boundary B of the crossing position P4 to the front end surface R1 is short compared with the distance from the boundary B of the crossing position P3 to the reference plane R, when the same charge 4 passes, it falls to the descending speed VL3. In comparison, the falling speed of the lowering speed VL4 becomes faster.

In the reference plane R of the shaft stave 10, the lowering speed VW3 at the reference plane R is significantly larger than the lowering speed VW1, and the wear to the plane 13, which is the reference plane of the stave body, is greatly increased from the state of FIG. do.

As described above, when the distance D between the protrusions 12 of the stave 10 is extremely large, the stagnant layers 19 and 18 are formed only at the lower end portions of the height W of the recesses. In the part which is not formed (the upper-end part of height W), the wear with respect to the plane 13 which is the reference surface R of the stave main body 11 increases significantly.

As shown in FIG. 8, when the space | interval D of the projection part 12 is small (interval D <200 mm of a projection part), the boundary B is a position of distance B5 from the reference plane R of the stave 10 for shafts, In the region from B to the reference plane R of the stave body, the speed of the charge 4 is decelerated. However, since the flat surface is formed at the front end surface R1 of the projection part 12, it becomes the frictional force of the charge 4 and the flat surface, and the deceleration effect as demonstrated in FIG. 6 is no longer obtained.

Looking at the lowering speed V5 in the crossing position P5, although the lowering speed V5 decreases from the boundary B to the average lowering speed V05 from the boundary B to the average lowering speed V05 inside the blast furnace 1, the protrusions 12 The falling speed VL5 is obtained from the tip end surface R1 of the. Since the stagnant layer 19 extends from the distal end surface R1 to the reference plane R of the stave body, the descending speed is almost zero. However, since the flat surface is formed at the distal end surface R1, the frictional force between the charge 4 and the flat surface becomes The lowering speed VL5 becomes faster than the lowering speed VL2.

Thus, in the shape of FIG. 8, the flat surface is formed in the front end surface R1 of the projection part 12, and the deceleration effect as demonstrated in FIG. 6 is no longer obtained. The descending speed VL5 with respect to the front end of the projection part 12 is larger than the descending speed VL2 in FIG. 6, and wear to the front end of the projection part 12 becomes large.

As mentioned above, in the stave 10 for shafts of this embodiment, the charged material which contacts the shaft stave 10 according to the arrangement | positioning of the projection part 12, ie, the space | interval of the adjacent projection part 12 ( The descent speed of 4) changes.

Here, the suitable range of the space | interval D of the projection part 12 is demonstrated with the test result by the tenth model of the stave 10 for shafts of this embodiment.

FIG. 9 shows the reference plane R of the charge 4 at each interval D by changing the distance D between the projections 12 of the stave 10 for shafts from 0 to 120 mm in the configuration of FIG. 6 described above. It is a graph which measured the descending speed VW (that is, the speed of the charge material 4 which contact | connects the surface of the plane 13 which is a reference plane of a stave main body).

In addition, FIG. 10 is the graph which measured the falling speed VL (that is, the speed of the charge 4 which contacts the tip of the projection part 12) in the front end surface R1 in the structure of FIG. 6 mentioned above. The thickness T of the protrusion part 12 of the shaft stave 10 was made into 5 mm, and the protrusion amount E was measured about 5 mm and 10 mm. The horizontal dotted line in the figure was an average descending speed V01 in the blast furnace 1, which was 2.4 mm / sec in this test.

In FIG. 9, the falling speed VW in the reference surface R of the main body for shafts 10 is less than the average falling speed V0 in all the measured settings, and especially the space | interval D of the projection part 12 is 100 mm or less. It can be seen that the falling speed VW decreases significantly. Moreover, also when the protrusion amount E is 15 mm, similarly to the case where the protrusion amount E is 10 mm, the descending speed VW decreases.

In FIG. 10, the lowering speed VL at the tip end surface R1 of the protruding portion 12 of the stave 10 for the shaft is less than the average lowering speed V01 when the interval D of the protruding portion 12 is 80 mm or less. Is a sufficiently small value in the range of 20 to 70 mm, and in particular, the distance D of the protrusion 12 at the minimum speed of the descending speed VL is 30 mm, and at 25 to 35 mm, which is 5 mm before and after the 30 mm. It is the smallest value. Moreover, also when the protrusion amount E is 15 mm, it is the falling speed VL similar to the case where protrusion amount E is 5 mm and 10 mm.

That is, even when the protrusion amount E is 15 mm, an appropriate deposit layer can be formed inside the blast furnace 1. Therefore, even if the protrusion amount E is 15 mm or less even if it is 10 mm or more, a self-running effect can be obtained, proper maintenance of a deposit is possible, low heat load, and it is easy to achieve stable operation with low fuel. As a result, the life of the blast furnace 1 can be extended significantly.

In view of the above, when the test results by the tenth model are actually converted, the intervals D of the protrusions 12 are 200 to 700 mm in arranging the protrusions 12 of the stave 10 for shafts. It can be said that it is in the range of, and more preferably in the range of 250 to 350 mm.

According to the present embodiment described above, the following effects can be obtained.

In the stave 10 for a shaft, since the inside surface of the furnace 1 of the blast furnace 1 is comprised by making the plane 13 of the stave main body 11 into the reference plane R, the charged material which descends in the blast furnace 1 ( 4) decelerates, and stagnant layers 19 and 18 are formed along the reference plane R. FIG. Thereby, the relative speed with respect to the reference surface R of the stagnation layers 19 and 18 becomes small, and in the stave main body 11, the mechanical wear of the reference surface R by the particle | grains of the charge 4 is reduced. Therefore, by arrange | positioning the stave of this embodiment to the shaft part S2 which is a site | part exposed to the granular charge dropping the inside of the blast furnace 1, it descend | falls as a massive 4A from the upper part of the shaft part S2 to an intermediate part. Sufficient durability is acquired also about the granular charge material to make.

By setting the distance D between the protrusions 12 to 200 to 700 mm, it is possible to develop a general charged material 4, that is, an ore-based charge material having a particle size of about 8 to 25 mm alternately charged and about 20 to 55 mm. For the coke-based charge of particle size, stagnation layers 19 and 18 are likely to be formed along the reference plane R. Thereby, the falling speed VW in the reference surface R can be reduced, and the falling speed VL of the particle | grains of the charged material 4 in the front-end | tip of the projection part 12 can be suppressed, and the stave 10 for shafts The whole wear relief effect can be made into the best state.

Since the projection part 12 was coated with the high hardness material on the surface, the projection part 12 can prevent abrasion of the projection part 12 itself. Therefore, the wear reduction effect of the stagnant layers 19 and 18 guided by the projection part 12 and the reference surface R by this can be stably maintained for a long time.

Since the projection part 12 was formed integrally with the stave main body 11, manufacture is easy, and the process for letting the projection part 12 pass the cooling conduit 17 also can be simplified.

In addition, in the stave 10 for shafts of this embodiment, although the stave main body 11 was made from copper or a copper alloy, it may not necessarily be copper or a copper alloy. By making the stave main body 11 made of copper or a copper alloy, since the cooling efficiency as the stave 10 for shafts can be improved, it is preferable. By using a stave made of copper or a copper alloy, the cooling performance is high, but the wear caused by the particles of the charge 4 is likely to be attenuated, but in the present embodiment, the wear can be alleviated by the stagnation layers 19 and 18. . As a result, high cooling performance can be maintained for a long time.

Since the pipe line 16 is provided in the stave main body 11 and the pipe line 17 is also provided in the protrusion part 17, the hardness of the surface of the protrusion part 12 can be maintained high by cooling of the protrusion part 12. FIG. Therefore, the abrasion prevention effect can be maintained for a long time.

In this embodiment, the blast furnace 1 can improve abrasion resistance by using the shaft stave 10 based on this embodiment as a shaft stave 2B.

In particular, in the shaft part S2 of the blast furnace 1 based on this invention, the stave of the area | region S7 which descend | falls as a block 4A in the state in which the charge 4 is granular ( 2B), the stagnant layers 19 and 18 are formed by the projections 12 of the stave 10 for shafts even if there are charges 4 falling in the granular state, and wear from the reference plane R is reduced. Is reduced.

In the shaft part S2, since the abrasion by the granular charge material 4 advances, operation as the blast furnace 1 becomes difficult. However, in this embodiment, since the wear resistant shaft stave 10 is provided in this part, operation of the blast furnace 1 can be performed stably for a long time, and the lifetime as a blast furnace can be extended.

Since the blast furnace 1 has the projection 12 of the shaft stave 10 arrange | positioned in the blast furnace 1 continuously in the perimeter of the circumferential direction, it is desirable to maintain the circumferential balance in the blast furnace 1 appropriately. It is easy to maintain the operation of the blast furnace 1 favorably.

[Second embodiment]

11, 12, and 13 show a second embodiment of the present invention.

The shaft stave 20 of this embodiment is used as the shaft stave 2B in the blast furnace 1 of 1st Embodiment mentioned above. The configuration of the blast furnace 1 is similar to that of the first embodiment described above, and the shaft stave 20 of the present embodiment has the same basic configuration as the shaft stave 10 of the first embodiment described above. Therefore, description is abbreviate | omitted about the common part with the stave 10 of 1st Embodiment mentioned above, and the other part is demonstrated below.

In FIG. 11, FIG. 12, and FIG. 13, the shaft stave 20 is the stave main body 11, the bolt accommodating part 11A, which are the same as the shaft stave 10 of 1st Embodiment mentioned above, It has the projection 12, the plane 13, the fire brick 15, the conduit 16, and the connection port 16A. In the shaft stave 10 of the first embodiment, however, the conduit 17 and the connection port 17A formed inside the protrusion 12 are omitted.

In this embodiment, the same effects as those of the first embodiment described above can be obtained. However, since there is no conduit 17 formed inside the protruding portion 12, no local cooling of the protruding portion 12 is obtained.

In this regard, local cooling of the protrusion 12 of the shaft stave 10 of the first embodiment described above is obtained. Thereby, since durability of the protrusion part 12 can be maintained high, it is most suitable for the site of the high load in thermal or abrasion in the blast furnace 1. On the other hand, since the shaft stave 20 of this embodiment has no conduit 17, the structure is simple and the manufacturing cost can be reduced, so that the load on the thermal or abrasion to the protrusion 12 is reduced. In the site | part which is not required very much, it can be said that the side of the stave 20 for shafts is preferable.

[Third embodiment]

14, 15, and 16 show a third embodiment of the present invention.

The shaft stave 30 of this embodiment is used as the shaft stave 2B in the blast furnace 1 of 1st Embodiment mentioned above. The configuration of the blast furnace 1 is similar to that of the first embodiment, and the stave 30 of the present embodiment has a basic configuration similar to that of the shaft stave 10 of the first embodiment. Therefore, description is abbreviate | omitted about the common part with the stave 10 for shafts of the said 1st Embodiment, and the other part is demonstrated below.

In FIG. 14, FIG. 15 and FIG. 16, the shaft stave 30 is the stave main body 11 similar to the shaft stave 10 of 1st Embodiment, 11A of bolt accommodating parts, It has the plane 13, the fire brick 15, the conduit 16, and the connection port 16A. However, in the shaft stave 30 of this embodiment, like the shaft stave 10 of the said 1st embodiment, the protrusion part 12 is not integral with the stave main body 11, Moreover, the 1st It is different from the conduit 17 and the connection port 17A inside the protrusion part 12 of embodiment. That is, the projection part 32 which is a member separate from the stave main body 11, and the pipeline 37 inside it are provided.

The protrusion part 32 of the shaft stave 30 is a square rod-shaped block molded from high hardness materials, such as TiN, TiC, WC, and Ti-Al-N system. A block may be formed from copper or a copper alloy or other material, and a high hardness material such as TiN, TiC, WC, or Ti-Al-N may be coated on the surface thereof.

32 A of grooves (concave part) are formed in the plane 13 used as the reference surface R of the stave main body 11, and the said projection part 32 is fitted in this groove 32A. By this structure, the projection part 32 protrudes from the reference surface R. As shown in FIG.

The pipeline 37 penetrates inside some of the protrusions 32. The projection part 32 in which the pipeline 37 was formed was twisted from the back side (outer side of the blast furnace 1) of the stave main body 11 in the intermediate part of the pipeline 37 as shown in FIG. It is fixed by the bolt 32C, and is fixed by the connection port 37A of the pipeline twisted in the both ends of the pipeline 37 similarly.

As shown in FIG. 14 and FIG. 15, the bolt 32B is twisted into the other protrusion 32 from the inside of the blast furnace 1, whereby the protrusion 32 is fixed.

In addition, in the state fitted to the stave main body 11, the space | interval D, protrusion amount E, and thickness T of the projection part 32 are the same as that of 1st Embodiment mentioned above.

In this embodiment, the same effects as those of the first embodiment described above can be obtained.

In addition, in this embodiment, since the protrusion part 32 and the stave main body 11 of the shaft stave 30 are separate members, the protrusion part 32 of the high hardness material different from the material of the stave main body 11 is ) Can be easily formed, and the wear resistance of the protrusions 32 can be further increased.

[Fourth Embodiment]

17, 18 and 19 show a fourth embodiment of the present invention.

The shaft stave 40 of this embodiment is used as the shaft stave 2B in the blast furnace 1 of 1st Embodiment mentioned above. The structure of the blast furnace 1 is the same as that of the said 1st Embodiment, and the stave 40 for shafts of this embodiment is fundamentally the same as that of the shaft stave 10 of the said 1st Embodiment. Therefore, description is abbreviate | omitted about the common part with the stave 10 for shafts of the said 1st Embodiment, and the other part is demonstrated below.

In FIG. 17, FIG. 18 and FIG. 19, the shaft stave 40 is the stave main body 11 similar to the shaft stave 10 of the said 1st embodiment, 11 A of bolt accommodating parts, It has the plane 13, the fire brick 15, the conduit 16, and the connection port 16A. However, instead of the stave main body 11 and the projection 12 integrated with the stave main body 11 of the shaft stave 10 of the said 1st embodiment, it is the same as the stave main body 11 similar to 3rd Embodiment mentioned above. The projection part 32 which is a separate member is provided. Here, in this embodiment, there is no conduit 37 and the connection port 37A in the inside of the projection part 32, and all the projection parts 32 are attached to the bolt 32C twisted from the back surface side of the stave main body 11. It is fixed by.

In this present embodiment, the same effect as in the above-described third embodiment can be obtained. However, since there is no conduit 37 formed inside the projection 32 of the shaft stave 40, no local cooling of the projection 32 is obtained.

In this regard, local cooling of the protrusion 32 of the shaft stave 30 of the third embodiment described above is obtained. Since the durability of the projection part 32 can be maintained by this, it is most suitable for the site of the high load in thermal or abrasion in the blast furnace 1. On the other hand, since the shaft stave 40 of this embodiment has no conduit 37, the structure is simple and the manufacturing cost can be reduced, so that the load on the thermal or abrasion to the protrusion 32 is reduced. In the site | part which is not required very much, it can be said that the side of the stave 40 for shafts is preferable.

[Modifications]

In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation etc. within the range which can achieve the objective of this invention are also included.

In the above embodiment, when the staves 10 to 40 are arranged in the blast furnace 1, the projections 12 and 32 of the respective shaft staves 10 to 40 move in the circumferential direction in the blast furnace 1. Although it is made to be ring-shaped continuously, it may be discontinuous ring shape mutually, may be arranged in a zigzag at a different height, and may be arranged in a spiral shape by changing a sequential height. However, in the operation of the blast furnace 1, the circumferential balance is important, and consideration should be given so as to obtain symmetry with respect to the center of the blast furnace 1.

In the above embodiment, the high hardness material is coated on the surface of the protrusion 12 of the shaft staves 10 to 40, or the protrusion 32 itself is formed of the high hardness material. Is not essential. However, since it protrudes from the reference surface R of the stave main body 11 of the shaft staves 10-40, and it is easy to receive abrasion by the charge 4, it is preferable to ensure abrasion resistance by a high hardness material.

In addition, the arrangement | positioning of the projection part 12, the cross-sectional shape, the arrangement | positioning of the pipes 16 and 17, the overall shape, the dimension, etc. of the staves 10-40 for a shaft may just select suitably at the time of implementation.

1: blast furnace
2:
2A: Evil
2B, 2C: stave
2D, 2E: Heat Resistant Brick
3: Gas capture mantle
4: Charge
4A: Odds
4B: Fuselage
4C: enemy base
4D: Core
5: Tuyere
5A: Hot wind
5B: Raceway
6: Outpost
6A: Iron
6B: Charter
10 to 40: stave for shaft
11: stave body
11A: Bolt receiving portion
12, 32: protrusion
13: Flat
15: Refractory bricks
16, 17, 37: cooling pipe
16A, 17A, 37A: Port
19, 18: stagnant layer
32A: Home
32B, 32C: Bolt
B: boundary
D: spacing
E: protrusion amount
R: reference plane
R1: Tip section
S1: nogubu
S2: shaft portion
S3:
S4:
S6:
S7: Mounting area of shaft for shaft
S8: Installation area of stave
V01 to V05: average descent speed
V1 to V5: descent speed
VL to VL5: Falling speed at the tip of the projection
VW to VW3: descent speed at the reference plane

Claims (11)

It is a stave installed in the inner circumference of the shaft of the blast furnace,
A stave main body having a reference surface facing the internal space of the blast furnace,
It has a projection projecting toward the inside of the blast furnace from the reference plane,
A groove recessed toward the outside of the blast furnace is formed in the reference plane between the plurality of protrusions of the stave body, and a refractory is provided only in the groove.
The stave body, characterized in that the copper or copper alloy. According to claim 1, The projecting dimension of the protrusion is 50 to 150mm,
A stave, characterized in that the interval between the adjacent protrusions is 200 to 700mm. The stave according to claim 1, wherein the projection is provided continuously or intermittently along the circumferential direction of the blast furnace. The stave of Claim 1 or 2 in which the surface of the said projection part is formed from the high hardness material. The recess of claim 1 or 2, wherein a recess is formed in the stave body,
The protrusion is a block embedded in the recess and protruding from the reference plane,
The stave, characterized in that the block is formed of a high hardness material. The stave according to claim 1, wherein the protruding portion is formed integrally with the stave body. The stave according to claim 1, wherein a conduit for cooling the protrusion is provided inside the protrusion. The stave according to claim 1, wherein an angle between the side of the lower side of the protruding portion and the reference plane is less than 90 degrees among the two opposing side surfaces of the adjacent protruding portion. The blast furnace provided with the stave as described in any one of Claims 1-3 and 6-8. The stave of Claim 4 was provided, The blast furnace characterized by the above-mentioned. The stave of Claim 5 was provided, The blast furnace characterized by the above-mentioned.

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