JPH09125119A - Method for changing fixed throat armor for blast furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a changing method of fixed throat armor for a blast furnace which can extend the repairing life and improve lowering of the cost and repairing workability. SOLUTION: The changing method of the fixed throat armor is provided with a process for inserting plural supporting pins 23 between the upper and the lower fixed throat armor 17, 18 from out of the furnace after blowing-off of in the blast furnace 10, a process for removing each first replacing part of the lower fixed throat armor 18 together with the corresponding part 14a of a shell 14, a process for welding by inserting the corresponded new partial furnace shell 14b and new first replacing part 31 to the removed gap 28 of each first replacing part, a process for removing each second replacing part together with the corresponding part of the furnace shell 14 after replacing to each new first changed part 31 and a process for welding by inserting the corresponding new shell part and new second replacing part to the removed gap of each second replacing part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for exchanging ore deposits for a blast furnace, and more particularly, to an ore deposit for a blast furnace which is not protected by a plate liner and which can easily replace an exposed lower ore deposit. Regarding replacement method.

[0002]

2. Description of the Related Art At the upper part of the furnace opening of a blast furnace, it is necessary to protect the charging material dispersed in the furnace by means of a furnace top charging device such as a bell from colliding with the furnace wall refractories and the iron skin to be worn. Around the ore receiving object made of heat resistant and wear resistant cast steel or heat resistant and wear resistant cast iron. As shown in FIG. 9, in the ore-receiver 100, the hollow metal pieces 101 are arranged in a staggered manner in upper and lower eight steps, and the surface of the hollow metal pieces 101 in the upper five steps is a thick annular plate liner 10.
2 and the ribs 104 projecting inward from the iron shell 103 of the furnace opening are attached to the fittings 105, respectively.
Is fixed through. The upper five steps of the hollow metal product 101 protected by the plate liner 102 are the upper ore metal receiver 1
00a and the lower three stages are lower ore deposits 100b.
Charges 10 dropped radially from a furnace top charging device (not shown)
6 is a plate liner 1 for covering the upper ore deposit 100a.
02 and the lower ore receiving material 100b, and is loaded into the furnace.

As described above, when the charging material 106 is charged,
Since a large amount of the charging material 106 collides with the inner peripheral surface of the ore receiving material 100, the surface of the ore receiving material 100 is seriously damaged, and at a proper time, from the manhole for hanging, which allows the ore receiving material 100 to be taken in and out, to the top of the furnace. Using a winch (not shown) installed on the
Only the plate liner 102 was replaced. On the other hand, the exposed damaged portion of the lower ore receiving material 100b is, for example, the one of the gas repair mantel as described in the specification of "Repair method of ore receiving material of blast furnace" in JP-A-57-98612. A long refractory spray nozzle was inserted into the furnace from the manhole on the opposite side to the damaged part, and an irregular shaped refractory was sprayed from the tip of the nozzle toward the damaged part for repair.

[0004]

By the way, in the conventional method for repairing the furnace wall of the blast furnace, the lower ore deposit 100 is thus obtained.
Since the damaged part of b was repaired by an irregular shaped refractory with poor wear resistance, which was sprayed from a long refractory spray nozzle, it usually only has a repair life of 2 to 3 months,
There was a problem that regular repairs were required. Therefore, it is conceivable to newly install a replacement device at the top of the furnace, but this has a problem that the repair work is troublesome and the cost is high, which is not practical. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method of replacing an ore deposit for a blast furnace, which can extend the repair life, reduce the cost, and improve the repair workability.

[0005]

According to the present invention, there is provided a semiconductor device comprising:
The method for replacing the ore deposit for the blast furnace is that the lower ore deposit below the upper ore deposit protected by the plate liner is the A method for exchanging ore deposits for a blast furnace, wherein the lower ore deposits are evenly assigned to each of the plurality of first replacement components and the second replacement components that are alternately arranged After the blast furnace is blown off, a step of inserting a plurality of support pins for supporting the upper ore metal receiving material from below between the upper ore metal receiving material and the lower ore metal receiving material from outside the furnace, and A step of cutting and removing each first replacement portion of the lower ore receiving material together with the corresponding portion of the iron shell from outside the furnace in a state in which the upper ore receiving material does not fall; and a removal void of each of the first replacement portions. Corresponding to the new A partial iron shell and a new first replacement portion for welding, and after replacing each of the first replacement portions, each second replacement portion of the lower ore deposit is placed in a furnace together with the corresponding portion of the steel shell. A step of cutting and removing from the outside and a step of inserting and welding a corresponding new partial iron shell and a new second replacement portion into the removal voids of the second replacement portions are provided.

[0006]

According to the method of replacing an ore deposit for a blast furnace according to claim 1, when the lower ore deposit among the ore deposits is replaced after the blast furnace is blown, a plurality of, for example, upper and lower ore deposits are provided. Insert the support pins of the book to prevent the upper ore receiver from falling during the replacement of the lower ore receiver.
After cutting the replacement part from the outside of the furnace together with the relevant part of the iron skin and removing it, a new partial iron skin and the first replacement part are inserted into the corresponding removal voids and welded, and then by the same operation, Since the second replacement section is replaced, a blast furnace profile in which the furnace condition is stable can be realized, and repair of the lower ore receiving member having a long life can be performed in a relatively short period of time and at low cost.

[0007]

As described above, in the method for exchanging the ore deposit for a blast furnace according to the first aspect, the lower ore deposit is arranged in such a manner that the plurality of first exchanging parts and second exchanging parts are alternately arranged in the circumferential direction. Since the lower ore deposits are replaced for each of the first and second replacement parts,
This is not a temporary repair method of spraying an irregular shaped refractory from the inside of the furnace to the damaged part as in the past, but it is possible to replace the damaged lower ore deposit entirely, so the repair life can be extended and this long life Can be repaired in a relatively short period of time and at low cost.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Next, referring to the attached drawings, an embodiment in which the present invention is embodied will be described to provide an understanding of the present invention. Here, FIG. 1 (a) is an enlarged longitudinal sectional view of an essential part showing a removed state of a first replacement part of a lower ore receiving material in a method for replacing an ore receiving material for a blast furnace according to an embodiment of the present invention, FIG. (B) is an enlarged longitudinal sectional view of an essential part showing a mounting state of the new first replacement portion, FIG. 2 is an enlarged transverse sectional view of an essential part showing a usage state of the support pin, and FIG. FIG. 3B is a vertical cross-sectional view of the upper side of the blast furnace showing the state before the replacement of the hardware, FIG. 3B is a vertical cross-sectional view of the upper side of the blast furnace showing the removed state of the first replacement part, and FIG. 4A is the new first replacement. 4B is a vertical sectional view of the upper side of the blast furnace showing a mounted state of the blast furnace, FIG. 4B is a vertical sectional view of the upper side of the blast furnace showing a removed state of the second replacement portion, and FIG. 5 is a blast furnace showing the mounted state of the second replacement portion. A vertical cross-sectional view of the upper side, FIG. 6 (a) shows a first replacement part and a second replacement part of the lower ore receiver. Schematic lateral enlarged sectional view showing an even allocation state of FIG. 6 (b) schematically lateral enlarged sectional view showing a removal state of the first replacement unit, FIG. 6 (c)
Is a schematic laterally enlarged cross-sectional view showing a welding work state of a new iron skin part to the removal gap of the first replacement part, and FIG. 7A is a new first replacement part to the removal gap of the first replacement part. 8 is a schematic enlarged lateral cross-sectional view showing a mounted state of the same, FIG. 7B is a schematic enlarged lateral cross-sectional view showing a removed state of the second replacement portion,
FIG. 8A is a schematic lateral enlarged cross-sectional view showing a welding work state of a new partial iron shell to the removal void of the second replacement part, FIG. 8B.
[Fig. 6] is a schematic lateral enlarged cross-sectional view showing a state of attachment of a new second replacement part to the removal gap of the second replacement part.

As shown in FIG. 3, the blast furnace 10 to which the method for exchanging ore deposit for blast furnace according to the embodiment of the present invention is applied is a small blast furnace having a capacity of 1000 m ³ . FIG.
As shown in (a), the ore-receiving material 11 constitutes the upper part of the furnace opening 10a of the blast furnace 10, and the hollow metal objects 12 are arranged in a staggered manner in eight steps, of which the upper five steps of the hollow metal objects 12 are arranged. The surface is protected by a thick annular plate liner 13. The ore deposit 11 is fixed to the ribs 15 protruding inward from the iron shell 14 of the furnace opening 10a via a pair of upper and lower fittings 16, respectively. Plate liner 1
The upper five steps of the hollow metal object 12 protected by 3 are the upper ore metal receiving material 17, and the lower three steps are the lower ore metal receiving material 18. Charges that are radially dropped from a furnace top charging device (not shown) bounce back to the plate liner 13 and the lower ore receiver 18 that cover the upper ore receiver 17 and are charged into the furnace. In FIG. 1A, reference numeral 19 is a cooling plate and reference numeral 20 is a stave. Hereinafter, the method for replacing the lower ore deposit 18 will be described in detail according to the respective work steps shown in FIGS.

As shown in FIG. 6 (a), among the ore deposits 11, lower ore deposits 18 below the upper ore deposit 17 protected by the plate liner 13 are arranged alternately in the circumferential direction. Each of the four first replacement parts 21 and the second
Even numbers are assigned to the replacement units 22 (see also FIG. 3A). Then, as shown in FIG. 1 (a), after the blast furnace 10 is blown off, a support pin 23 for supporting the upper ore deposit 17 from below is provided between the upper ore deposit 17 and the lower ore deposit 18.
3 for each of the first and second replacement parts 21 and 22, 24 in total, are inserted from outside the furnace. The insertion method is to use a drill from the outside to insert the first and second replacement parts 21, 2
From the corresponding iron shell parts 14a and 14c of FIG. 2 (see also FIG. 6A), the hollow metal product 12 of the fifth stage of the upper ore metal receiving product 17
Three through holes 24 are formed toward the inside of each of the above, and the support pin 23 is inserted into each through hole 24 (see also FIG. 2).

Subsequently, as shown in FIGS. 3 (b) and 6 (b), each first replacement portion 2 of the lower ore receiving material 18 is in a state in which the upper ore receiving material 17 is prevented from falling by the respective support pins 23.
1 is removed from the outside of the furnace together with the corresponding partial iron skin 14a of the iron skin 14 of the furnace opening 10a, for example, by cutting it in a width.
As described above, the ore metal receiving object 11 is formed by staggering the hollow metal objects 12 in the upper and lower eight steps, and when cutting the metal ore metal objects 12, for example, a gap between the hollow metal objects 12 is formed by a chipping tool, or the adjacent second metal The portion that straddles the replacement portion 22 is cut by fusing or using a burner for welding. The cutting range includes the upper and lower two cooling boards 19 directly below the lower ore deposit 18. Also, as shown in FIG.
The removal of the first replacement portion 21 is performed by pulling it out by a pull-out winch 26 vertically provided on the work floor 25 outside the furnace opening 10a. After that, the hoist crane 27 outside the furnace lifts the hoist crane and removes it.

Next, as shown in FIGS. 4 (a) and 6 (c), after the new partial iron shell 14b is welded from the outside of the furnace to the removal gap 28 of each first replacement portion 21, the inside of the furnace is then welded. Using the hoist crane 27a of No. 1, a new first replacement part 31 suspended from the repair hole 30 of the gas repair mantel 29 is inserted from the inside of the furnace, and it is welded to the partial iron shell 14b (Fig. 7).
(A)). As shown in FIG. 1 (b), a new first replacement section 31 includes a stave-type water-cooled metal fitting 32 having a built-in cooling water pipe and the water-cooled metal fitting 32, and a plate liner on the core-side surface. 33 are arranged. When the new first replacement portion 31 is housed in the removal void 28, the plate liner 33 is flush with the surface of the plate liner 13 for the upper ore deposit 17. At the time of mounting, the blast furnace charge charged from the furnace top charging device (not shown) collides against the plate liner 33 and bounces off, so that the water-cooled metal fitting 32 can be prevented from being scratched by the blast furnace charge.

Subsequently, as shown in FIGS. 4 (b) and 7 (b), the respective second replacement parts 22 of the lower ore deposit 18 are
It is cut and removed from the outside of the furnace together with the partial iron skin 14c which is the corresponding portion of the iron skin 14. The second replacement section 22 is the furnace opening section 1.
0a Drawer winch 2 suspended from the work floor 25 outside
6 is pulled out. After that, the hoist crane 27 outside the furnace lifts the hoist crane and removes it. Next, as shown in FIG. 5 and FIG. 8 (a), after welding a new partial iron shell 14d from outside the furnace to the removal gap 34 of each second replacement portion 22, a hoist crane 27a inside the furnace is used. Then, a new second replacement part 35 suspended from the repair hole 30 of the gas repair mantel 29 is inserted from the inside of the furnace to remove the partial steel shell 1
4b (see FIG. 7 (a)). In addition, the new second
The replacement unit 35 includes the new first replacement unit 31 and
It has the same structure. In this way, the old lower ore deposit 18 including the damaged portion is replaced with the new lower ore deposit 18a. This new lower ore deposit 18a,
Old ore deposit 17 and new ore deposit 1
1a is configured.

As described above, the lower ore deposit 18 is provided with four first replacement portions 21 and two second replacement portions 21 which are alternately arranged in the circumferential direction.
Even numbers are assigned to the replacement unit 22 and these first and second
Since the lower ore deposit 18 is replaced for each of the replacement parts 21 and 22, as described in the section of the prior art,
It is possible to replace the damaged lower ore deposit 18 as a whole by using a long refractory spray nozzle, instead of an emergency repair method of spraying an irregular shaped refractory from the inside of the furnace to the damaged part. A stable blast furnace profile can be realized, the repair life is extended, and this long life repair can be performed in a relatively short period of time and at low cost.

The embodiment of the present invention has been described above.
The present invention is not limited to this, and any change in design without departing from the gist is included in the present invention.
For example, each support pin does not have to be extracted after the replacement of the second replacement portion as in the embodiment, or may be removed. Further, in the embodiment, the stave type water-cooled metal parts are shown as the new first and second replacement parts, but the present invention is not limited to this. Furthermore, in the embodiment, the lower ore deposits are arranged in four circumferentially alternating first
Although the replacement section and the second replacement section are allocated, the first and second replacement sections are not limited to this, and each of the replacement section and the second replacement section has four sections.
Two or more even numbers except one may be assigned. Furthermore, in the embodiment, when replacing the lower ore gold receiving object, the lower ore gold receiving material is replaced with the cooling board arranged directly below the lower ore gold receiving material. You may replace only.

[Brief description of the drawings]

FIG. 1 (a) is an enlarged longitudinal cross-sectional view of an essential part showing a removed state of a first replacement part of a lower ore receiving material in a method of replacing an ore receiving material for a blast furnace according to an embodiment of the present invention. (B) It is a principal part expanded longitudinal cross-sectional view which shows the attachment state of the same new 1st replacement part.

FIG. 2 is an enlarged cross-sectional view of a main part showing a usage state of the support pin.

FIG. 3 (a) is a vertical cross-sectional view of the upper side of the blast furnace showing a state before replacement of the lower ore deposit. (B) It is a longitudinal cross-sectional view of the upper side of the blast furnace showing a removed state of the same first replacement part.

FIG. 4A is a vertical cross-sectional view of the upper side of the blast furnace showing a mounting state of the new first replacement portion. (B) It is a longitudinal cross-sectional view of the upper side of the blast furnace showing a removed state of the second replacement part.

FIG. 5 is a vertical cross-sectional view of the upper side of the blast furnace showing a mounting state of the second replacement section.

FIG. 6 (a) is a schematic lateral enlarged cross-sectional view showing an even allocation state of the first replacement portion and the second replacement portion of the same lower ore receiver. (B) It is a schematic horizontal expanded sectional view which shows the removal state of the same 1st replacement part. (C) It is a schematic lateral enlarged cross-sectional view showing a welding work state of a new partial iron shell to the removal void of the first replacement portion.

FIG. 7 (a) is a schematic lateral enlarged cross-sectional view showing a state in which the new first replacement portion is attached to the removal gap of the first replacement portion. (B) It is a schematic lateral enlarged sectional view showing a removed state of the second replacement portion.

FIG. 8 (a) is a schematic lateral enlarged cross-sectional view showing a welding work state of a new iron skin portion into the removal void of the second replacement portion. (B) It is a schematic horizontal expanded sectional view which shows the attachment state of the new 2nd replacement part to the removal space | gap of the 2nd replacement part.

FIG. 9 is an enlarged vertical cross-sectional view of essential parts showing a damaged state of the lower ore receiving material according to the conventional means.

[Explanation of Codes] 10 Blast Furnace 10a Furnace Portion 11 Ore Receiving Material 11a Ore Receiving Material 12 Hollow Hardware (Ore Receiving Material) 13 Plate Liner 14 Iron Skin 14a Partial Iron Skin 14b New Part Steel Skin 14c Part Steel Skin 14d New Partial iron shell 15 Rib 16 Mounting bracket 17 Upper ore receiving material 18 Lower ore receiving material 18a Lower ore receiving material (water-cooled ore receiving material) 19 Cooling plate 20 Stave 21 First replacement portion 22 Second replacement portion 23 Support pin 24 penetration Hole 25 Working floor 26 Drawer winch 27 Hoist crane 27a Hoist crane 28 Removal void 29 Gas repair mantel 30 Repair hole 31 New first replacement part 32 Water-cooled hardware 33 Plate liner 34 Removal void 35 New second replacement part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tsutsumi Fumimizu 46-59 Nakahara, Tobata-ku, Kitakyushu City, Fukuoka Prefecture Nippon Steel Corporation Machinery & Plant Division

Claims (1)

[Claims] 1. A plurality of ore deposits circumferentially provided at an upper part of a furnace opening, wherein lower ore deposits lower than an upper ore deposit protected by a plate liner are alternately arranged in a circumferential direction. A method for replacing ore deposits for a blast furnace, wherein the lower ore deposits are evenly allocated to the first and second replacement parts, and the lower ore deposits are replaced for each of the first and second replacement parts. After the wind, a step of inserting a plurality of support pins for supporting the upper ore metal receiving material from below between the upper ore metal receiving material and the lower ore metal receiving material from outside the furnace, and dropping the upper ore metal receiving material by the supporting pins. In a prevention state, a step of cutting and removing each first replacement part of the lower ore receiving material together with the corresponding part of the iron shell from the outside of the furnace, and a new part corresponding to the removal void of each first replacement part. Iron skin and new first (1) a step of inserting a replacement part and welding, and a step of, after the replacement of each of the first replacement parts, cutting and removing each of the second replacement parts of the lower ore receiver together with the corresponding part of the iron shell from the outside of the furnace And a step of inserting a corresponding new partial iron shell and a new second replacement portion into the removal voids of each of the second replacement portions and welding them, the replacement of the blast furnace ore receiving material. Method.