JP5225614B2 - How to remove blast furnace residue - Google Patents

Description

  The present invention relates to a method for removing residue, and more particularly, to a method for removing residue remaining on the bottom of a blast furnace when repairing a blast furnace.

The contents of the high-temperature molten state are accommodated inside the blast furnace during its operation. Such blast furnaces need to be refurbished regularly.
In refurbishing the blast furnace, the contents in a high-temperature molten state are cooled and solidified by pouring water into the furnace. This solidified content remains at the bottom of the furnace. Among the contents, the residue with high specific gravity remains in the furnace bottom and is integrated with the refractory material etc. of the furnace bottom, and its weight ranges from 300 to 2000 tons.
Thus, the removal of the residue remaining on the bottom of the furnace is an indispensable process for dismantling the blast furnace body, and becomes a critical path when the blast furnace is repaired. There have been many cases in which the removal of the ruins did not proceed as planned and caused a delay in the repair period, which is a very difficult task.

In removing such residue, a method of dividing a huge residue into small portions and carrying it out is often used. In order to divide and carry out such residue, a technique for blasting the residue has been developed (see Patent Document 1).
In this technique, an opening is first formed in the outer wall surface of the furnace bottom portion, and the refractory along the wall surface is removed from the opening to expose the residue. Then, a plurality of blasting holes are formed in a semicircular shape in the residue of the exposed portion, and the blasting is performed so as to squeeze out. By repeating the cutting by such blasting, the residue is divided from one end side to the other end side and carried out as a small block.

However, the conventional removal work of trash by blasting has the following problems.
First, there is a problem that the construction period becomes longer because it is necessary to repeat the breakage by blasting. That is, the amount of excavation in the core direction by demolition of residue after one blast is about 1.5 m from the periphery of the residue, and in order to reach the center of the residue, the number of times according to the distance to the center of the residue Must be blasted. Further, since the area of the cutting face becomes wider as it goes in the direction of the core, in order to dig a distance of 1.5 m over the entire cutting face, a large number of holes for blasting and the number of times of blasting are required. For this reason, although it depends on the amount of residue, it takes a very long time to complete the removal of the residue, and in the past results, when removing 300 tons of residue by blasting, It took 7 days, and about 1500 tons, it took about 14 days.

  Secondly, there is a problem of preventing surrounding influences due to blasting. In other words, since the method of removing residues by blasting involves danger, thorough safety measures are required. In addition, when crushing the residue by blasting, the peripheral equipment is damaged due to the blast at the time of the blasting or the scattering of small pieces of the residue, so repair of the damaged equipment was necessary. In order to prevent damage to the peripheral equipment, the iron opening for carrying out the small portion of the residue requires a lot of cost for safety measures such as installing temporary equipment for preventing the scattering.

In order to solve such a problem caused by blasting, a technique for dividing and transporting the residue using a wire saw has been proposed by the present applicant (see Patent Document 2).
In the technique described in Document 2, when the blast furnace is refurbished, first, the iron shell of the portion where the residue is carried out is removed from the furnace body, and the work machine and the like are introduced into the furnace body from this portion. Then, a bottom bottom through-hole for inserting the wire saw is drilled in the bottom refractory under the bottom, and the wire saw is inserted into the bottom bottom through-hole, and the wire saw is moved to the upper surface side of the bottom on the opposite side. Wrap it into a loop. In this state, the wire saw is run, and the residue and the bottom refractory are integrally cut in the vertical direction. By this cutting, the residue is divided into a plurality of residue blocks, and the divided residue blocks are sequentially drawn out of the furnace.
The divided residue block is integrated with the bottom furnace refractory, but the bottom refractory (such as refractory bricks) itself is brittle, so it can be easily separated or collapsed when it is pulled out in the lateral direction. And only the residual block can be taken out.
Such a residue splitting method using a wire saw can efficiently split or carry out, and has a shorter construction period and simple safety measures than the blasting method described above.

JP 2000-256717 A JP 2007-084856 A

By the way, in the residue dividing system using the wire saw described above, a through hole is formed in the furnace bottom refractory material under the residue and the wire saw is inserted.
The existence of this through-hole has been a problem in considering further efficiency as a method for removing the residue.
That is, in order to construct the through hole, it is necessary to repeat a plurality of drilling operations by the punching device prior to dividing the residue. Each drilling operation is a long process that crosses the furnace bottom refractory material, and is not necessarily a simple operation.
In addition, when cutting with a wire saw, it is necessary to use the above-mentioned through-holes to wind the wire saw around the residue one after another. It was not an easy task.

  The main object of the present invention is to provide a method for removing residues that can be safely and easily removed in a short period of time when residues remaining on the bottom of the blast furnace are removed.

The residue removal method of the present invention is a residue removal method in which, when repairing a blast furnace, the residue remaining on the bottom refractory is divided and removed to the outside of the furnace as a plurality of residue blocks. And lifting the residue with a lifting device to lift it from the furnace bottom refractory, and placing a spacer between the residue and the furnace bottom refractory to support the residue with the spacer The method includes a supporting step, a dividing step of cutting the residue with a wire saw and dividing the residue into a plurality of residue blocks, and a carrying-out step of sequentially drawing the residue blocks out of the furnace.

According to the aspect of the invention, for supporting the spacer in a state of lifting the residual iron from the hearth refractories can utilize the space between the remaining pig iron and furnace bottom refractory even when using the word Iyaso. Therefore, the construction work of the through-hole and the work of inserting the wire saw into the through-hole in the prior art described above can be avoided, and the trouble caused by each can be eliminated.

In the residue removal method of the present invention, in the lifting step, a plurality of jacks are used as the lifting device, the jacks are installed around the residue, and the entire residue is lifted from the furnace bottom refractory. It is desirable.
In the present invention, by using a plurality of jacks, each jack may be small, and when each is introduced into the furnace, the opening formed in the furnace wall is limited in size. Even so, it is possible to cope sufficiently.
Moreover, compared with the case where a huge lifting device is used, carrying-in and carrying-out are easy, and the number of jacks can be increased / decreased according to the scale of the blast furnace to be processed, thereby enabling efficient operation.

In the residue removal method of the present invention, in the supporting step, it is preferable that the jack is removed after the residue is supported by the spacer.
In the present invention, since the residue can be supported by the spacer after the spacer is arranged, there is no problem even if the jack is removed.
And if a plurality of jacks arranged around the residue in the lifting process remain, it becomes difficult to obtain a work space in the next division process, but by removing these jacks, around the residue Sufficient space can be secured, and the work in the next division step can be easily performed.

In the residue removal method of the present invention, the dividing step includes a scheduled dividing surface setting step for setting a primary divided planned surface and a secondary divided planned surface that intersect with the residue, and the primary divided planned surface. It is desirable to include a primary division step of dividing to form an intermediate residue block, and a secondary division step of dividing the intermediate residue block along the planned secondary division plane to form a residue block. .
In the present invention, the residue is divided into a lattice shape in the planar shape by the primary division planned surface and the secondary division planned surface, and even if the cutting with the wire saw is linear, the final A large residual block can be made small in both length and width.
In addition, blasting is used for secondary division as will be described later in order to perform secondary division by first performing primary division to make the residue a long intermediate residue block and then sequentially cutting the intermediate residue block. However, it can be made small-scale, or it can cope with diversification of construction procedures such as performing secondary division separately for each section.

In the residue removal method of the present invention, the dividing step may use a wire saw for each of the primary dividing step and the secondary dividing step.
In the present invention, since blasting is not used at all, it is possible to completely avoid the problems associated with the conventional blasting mentioned above, that is, the problem of process management of removal work, and the problem of safety measures against the blast and the scattering of small fragments. .

In the residue removal method of the present invention, the dividing step may use a wire saw for the primary dividing step and blasting for the secondary dividing step.
In the present invention, since the blasting is used only for the secondary division of the intermediate residue block that has already been cut into a long shape, the blasting scale can be made sufficiently small, and the problems associated with the conventional blasting described above Can be suppressed to the extent that does not substantially hinder.
More specifically, the blasting in the secondary division process is blasting to an intermediate residue block that has already been divided by a wire saw , the secondary division scheduled surface to be blasted is straight, and the intermediate residue block is Because it is a short part that crosses, blasting can be reduced in scale and the number of times can be greatly reduced compared to the conventional method. For this reason, the conventional problem accompanying blasting can be minimized while performing efficient division by blasting.

Such downsizing of blasting in the secondary division process is mainly based on the following reasons.
First, in this process, the degree of freedom of the portion divided by blasting is increased. In other words, in conventional blasting, for example, a C-shaped block is divided from a lump of residue, so that the portion to be divided is continuously fixed to the periphery, and the portion to be divided has no freedom of movement. . For this reason, the division | segmentation of the part requires a big force and the scale of blasting becomes large. On the other hand, the remnant block already divided by the wire saw is already separated from the surroundings, and a degree of freedom of movement is obtained in the direction along the division surface by the wire saw (direction along the primary division planned surface). Blasting in the same direction can be made small enough.
Secondly, the remnant blocks that have already been divided by the wire saw are separated from other surrounding remnant blocks, but are surrounded by these other remnant blocks, so the effect of blasting is This will contribute to ensuring safety.

In this way, in the present invention, by performing the primary division with the wire saw first, and subsequently performing the secondary division process by blasting, the blasting was utilized while minimizing the influence of blasting as a whole. Efficient division work can be performed.
As a result, it is not necessary to consider the removal depth of the residue that affects the process progress management as in the case where all of the residue is subdivided by conventional blasting, and the management of the removal operation is simple. In addition, since blasting can be done on a small scale, it is possible to minimize the explosion of blasts and remnants, ensuring safety and reducing temporary costs such as installing protective walls.

In removing method of the remaining pig iron of the present invention, the dividing step, the portion intersecting with the primary dividing plane or secondary dividing plane before Symbol spacers leave perforations a wire saw insertion hole, the wire in this insertion hole It is desirable to insert a saw and cut the spacer together with the residue.
In such present invention, the use of the word Iyaso, can be reliably cut a large residual iron. In the present invention, since the residue is lifted and supported by the spacer, the wire saw can be passed below the residue through the space between the furnace bottom refractories and the wire saw can be cut smoothly and easily. Can do.
Here, when a wire saw is inserted between the residue and the furnace bottom refractory, the wire saw does not cause any interference in a portion where there is no spacer. On the other hand, even when the spacer and the wire saw intersect, cutting with the wire saw can be performed by opening a through hole in the spacer and inserting the wire saw. At this time, the through hole opened in the spacer is a sufficiently short distance, and the processing and insertion work is much easier than the conventional through hole penetrating the furnace bottom refractory in the radial direction.

In the residue removal method of the present invention, the spacer is a long steel mold, and one of the primary division planned surface and the secondary division planned surface is set along the longitudinal direction of the spacer. It is preferable that the insertion hole drilled in the spacer is for inserting a wire saw used for either one of the primary division planned surface and the secondary division planned surface.
In the present invention, by using a mold steel material such as H-shaped steel, C-shaped steel or the like as the spacer, it is possible to collectively support a wide range of the planar shape of the residue. Moreover, since it is a long material, it can insert from the outer periphery of a residue to the center part of a residue, and can perform installation work easily.
Here, for example, if the spacer is arranged along the primary division planned surface, the wire saw in the primary division can be prevented from interfering with the spacer at all. At this time, if a wire saw is used for secondary division, an insertion hole is processed in the web portion of the spacer at a position intersecting the path of the wire saw, that is, the planned secondary division plane, so that the wire saw is passed. That's fine. If blasting is used for the secondary division, the processing of the through hole for the spacer is completely unnecessary.

In the residue removal method of the present invention, in the dividing step, the secondary dividing step is performed in parallel with respect to the already divided intermediate residue block while performing the primary dividing step on a part of the residue. It is desirable to do so.
In such a present invention, in the dividing step, the primary dividing step and the secondary dividing step can be overlapped for each section, so that it is possible to reuse the equipment used for each, and the construction period as the dividing step Shortening can be achieved.

In the residue removal method of the present invention, it is desirable to perform the unloading step in parallel with respect to the already-divided residue block while performing the dividing step.
In the present invention, since the division process and the unloading process can be overlapped for each section, it is possible to reuse the equipment used for each, and shorten the work period from the start of the dividing process to the completion of the unloading process. Can be planned.
In particular, the primary division, the secondary division, and the unloading are progressing sequentially from one end of the residue to the other by overlapping the unloading step while overlapping the primary dividing step and the secondary dividing step. This is effective for shortening the work period.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[First embodiment]
In this embodiment, in order to repair the blast furnace, the residue remaining in the blast furnace is removed, and the removal of the residue is performed based on the present invention.
1 and 2, the blast furnace 10 includes an iron shell 11 as an exterior, and a refractory material 12 such as a refractory brick is disposed on the inside thereof.

Prior to the refurbishment, the operation of the blast furnace 10 is stopped, and water is injected for cooling the blast furnace 10. By this water injection, the molten iron in the furnace is cooled and solidified, and remains as residue 1 on the furnace bottom refractory 2 having a stacked structure such as carbon brick.
The residue 1 includes a residue body 4 and a surface slag 3. That is, when the residue 1 is solidified, the slag 3 remaining on the surface of the residue body 4 is also cooled and solidified, and is attached to the surface of the residue body 4 and integrated.

In the renovation, the refractory material 12 along the iron skin 11 is removed, and the residue 1 and the furnace bottom refractory 2 are left in a flat cylindrical shape. At the level of the residue 1 at the lower part of the furnace body, a work opening 13 is provided by partially removing the iron skin 11.
The residue 1 is set to have a division plan surface that is a lattice shape in its planar shape (details will be described later), and is divided along this planned division surface to finally form a small residue block 9, which is outside the furnace. It is carried out to.

  In order to carry out such division or removal of residues, in this embodiment (1) after setting the arrangement, each step based on the method for removing residues according to the present invention, that is, (2) Lifting, (3) support by a spacer, (4) primary division of the residue, (5) secondary division of the residue, and (6) withdrawal of the residue block are performed.

(1) Setting of arrangement In this embodiment, a jack 21 is used as a lifting device for lifting the residue 1. Further, a long steel material, for example, H-shaped steel is used as the spacer 22 for supporting the residue 1.
Here, the arrangement of the jacks 21 is set based on the arrangement of the spacers 22. The arrangement of the spacers 22 is set based on the setting of the division planned surface of the residue 1.

As the planned division planes, a horizontal primary division planned plane P1 in FIG. 2 and a secondary division planned plane P2 orthogonal thereto are set.
Three (P11 to P13) are set as the primary division planned plane P1, and the residue 1 is divided into four rows of intermediate residue blocks 8 by these. Three secondary division planes P2 (P21 to P23) are set, and the intermediate residue block 8 is divided into four residue blocks 9 respectively.

A pair of spacers 22 is arranged in each block so that the spacer 22 is reliably supported even when the residue 1 is the intermediate residue block 8 obtained by primary division or the residue block 9 obtained by secondary division.
Specifically, as shown in FIG. 4 or FIG. 7, the spacers 22 are arranged along the both sides in the longitudinal direction of each intermediate residue block 8 partitioned by the respective primary division planned surfaces P <b> 11 to P <b> 13. In this embodiment, since four intermediate residue blocks 8 are formed, eight spacers 22 are used.
Each spacer 22 is set to a length sufficient to cross the residue 1 at each installation site, and both ends of each spacer 22 are in a state of protruding from the side surface of the residue 1 in the installation state. For this reason, it is possible to adjust the installation position of the spacer 22 by operating the protruding end.

The spacer 22 is inserted between the residue 1 and the furnace bottom refractory 2 with the residue 1 lifted by the jack 21. Therefore, the position where the jack 21 is installed needs not to interfere with the spacer 22. On the other hand, it is desirable that the jack 21 be in a position where it can be easily installed from the periphery of the residue 1 and the furnace bottom refractory 2 left in the furnace.
For this reason, in this embodiment, it is between a pair of spacers 22 that support each intermediate residue block 8 and is close to the outer periphery of the residue 1, specifically at six locations as shown in FIG. 2. Shall be placed.

(2) Lifting of residue In this step, after the jack 21 is installed in the above-described arrangement, the residue is lifted by the jack 21.
First, a recess 23 for jack installation is formed on the side surface of the furnace bottom refractory 2. Specifically, as shown in FIG. 1, a gantry 14 is installed facing the work opening 13, and a heavy machine 15 is introduced into the gantry 14. Then, a heavy machine 15 excavates from the side surface of the furnace bottom refractory 2 to form a recess 23, and a jack 21 is installed in the recess 23.

Next, the entire residue 1 is lifted up collectively by the jack 21. At this time, pay attention to the balance of lifting by each jack 21, and maintain the level even when the residue 1 rises.
As shown in FIG. 3, as the residue 1 is lifted, the furnace bottom refractory 2 is separated from the bottom surface of the residue 1 by its own weight, and a gap 24 is provided between the furnace bottom refractory 2 and the residue 1. Is formed.

(3) Support by spacer In this process, the spacer 22 is inserted into the gap 24 between the furnace bottom refractory 2 and the residue 1, the jack 21 is lowered, and the residue 1 is supported by the spacer 22.
First, as shown in FIG. 3, the spacer 22 is introduced into the gap 24 between the furnace bottom refractory 2 and the residue 1. The spacers 22 are introduced one by one from the gantry 14 using an existing transport device.
At this time, as shown in FIG. 4, the spacer 22 is introduced so as not to interfere with the jack 21. As described above, the planar arrangement of the spacers 22 is installed at positions on both sides of each intermediate residue block 8 so as to be parallel to the respective primary division planned surfaces P11 to P13.

When all the spacers 22 have been installed, the jack 21 is lowered as shown in FIG.
As a result, the residue 1 that has been supported by the jack 21 is placed on the spacer 22 and is supported by the spacer 22.
When the jack 21 is further lowered and the load of the residue 1 on the jack 21 is eliminated, the jack 21 is removed from the recess 23 and removed.
The jack 21 may be left in the recess 23 as it is, but it is desirable to remove it at this stage so as not to get in the way of the subsequent division of the residue.

(4) Primary division of residue In this step, the residue 1 supported by the spacer 22 is cut along a primary division planned surface P1 (P11 to P13).
In the primary division of this embodiment, a procedure for cutting the residue 1 so as to cross the residue 1 is adopted, but a procedure (described later) for dividing the primary division into several sections can be adopted. .

In this embodiment, a wire saw 25 as the a primary division.
As shown in FIGS. 6 and 7, the wire saw 25 is sequentially arranged on each primary division planned plane P <b> 11 to P <b> 13, and the end portion of the residue 1 is wound from the upper surface of the residue 1 to the lower surface side. A loop-shaped route returning along In this state, by driving the wire saw 25 with an existing driving device (not shown), the residue 1 is cut and four intermediate residue blocks 8 are formed.

As the wire saw 25 used in the present embodiment, an existing one can be used as appropriate.
For example, a bead consisting of an abrasive layer such as a base metal and a diamond bead is provided at a distance from a wire rope that is a metal stranded wire, and the wire rope exposed at the middle part of the bead is covered with a coating material such as resin or rubber. Things. In the present embodiment, for example, “Allied Material Product No. EWLS-255” used for dismantling and repairing subways, buildings, roads, bridges and the like can be used as the wire saw.
When the traveling speed of the wire saw 25 is less than 20 m / second, efficient cutting becomes difficult, and when the wire saw 25 exceeds 30 m / second, the wire saw 25 is frequently cut. Therefore, a range of 20 m / second to 30 m / second is preferable.

(5) Secondary division of residue In this step, each intermediate residue block 8 formed by primary division is secondarily divided to form residue blocks 9.
In the present embodiment, the secondary division is performed by small-scale blasting.
6 and 7, the blast holes 26 are arranged along the secondary division planned plane P2 (P21 to P23) in each intermediate residue block 8 formed by the primary division. Each blasting hole 26 is drilled from the surface of the intermediate residue block 8 (residue 1) to a predetermined depth using an existing drilling machine.
The blasting holes 26 are filled with blasting explosives, and one row is ignited at the same time, so that blasting is performed along each of the secondary division planned surfaces P21 to P23.

In addition, since it is desirable to make the blasting in the furnace as small as possible, in this embodiment, it is performed for each of the secondary division scheduled surfaces P21 to P23 of one intermediate residue block 8.
However, any of the secondary division planned surfaces P21 to P23 across the plurality of intermediate residue blocks 8 may be performed simultaneously, and a plurality of the secondary division planned surfaces P21 to P23 of one intermediate residue block 8 are performed simultaneously. May be.
Although details will be described later, the previous process “primary division of residue” is performed in a part of residue 1, while the process “secondary division of residue” is performed in another part. Also good.

  As described above, each intermediate residue block 8 is secondarily divided into four residue blocks 9. Therefore, the residue 1 is divided into a total of 16 residue blocks 9 as a result of the primary division and the secondary division.

(6) Pulling out residue block In this step, the residue block 9 formed by the above-described secondary division by blasting is sequentially pulled out of the furnace.
When the residue block 9 is pulled out of the furnace, a carrying base (not shown) is further formed on the base 14 to form a transport surface at the same level as the upper surface of the spacer 22. The residue block 9 is slid sequentially and carried out of the furnace. When the residue block 9 is slid sideways, a wire is bound to the residue block 9, and the wire may be pulled by a hydraulic jack or the like (not shown) outside the furnace.

In order to smoothly pull out the residue block 9, a roller or the like may be appropriately installed on the upper surface of the carry-out rack, or a carriage may be installed and conveyed individually.
Furthermore, not only towing by a wire and a hydraulic jack, the remnant block 9 may be driven using a powered conveyor as a carry-out rack.
Also, instead of installing an unloading platform, a construction machine (not shown) such as a dozer excavator is introduced into the furnace through the work opening 13, and the residue block 9 is lifted and removed from the furnace. The residue block 9 carried out of the furnace by a crane (not shown) may be lifted and moved to a predetermined location. By using a construction machine such as a dozer excavator or a crane, it is possible to omit installation of the above-described carry-out stand and the like. Moreover, since it is a construction machine, the surroundings of the blast furnace 10 can be carried out without any problem even in a situation where the scaffolding is slightly poor.

According to this embodiment, the residue 1 can be lifted to form the gap 24 between the bottom refractory 2 and the bottom refractory 2 can be lowered even when the wire saw 25 is cut. Work such as forming holes can be eliminated.
Further, in the secondary division, quick work can be performed by blasting, and the scale of blasting can be reduced, so that both safety and work efficiency can be achieved.

[Second Embodiment]
In this embodiment, (1) after setting the arrangement, each step based on the method for removing a residue of the present invention, that is, (2) lifting the residue, (3) supporting by a spacer, (4) residue This is the same as the first embodiment described above in that the primary division, (5) secondary division of the residue, and (6) extraction of the residual block are performed. The contents of the steps (1) to (6) are the same as those in the first embodiment except for the secondary division of (5) residue. For this reason, the description which overlaps about the same process is abbreviate | omitted and (5) secondary division of a residue different from 1st embodiment is demonstrated.

(5A) Secondary division of residue In the secondary division of the first embodiment, the intermediate residue block 8 was cut by blasting into a residue block 9.
In the secondary division of the present embodiment, the residual residue block 9 is formed by cutting the intermediate residual block 8 with a wire saw 25 similar to the primary division.
8 and 9, each intermediate residue block 8 formed by the primary division is sequentially arranged with the wire saw 25 along the planned secondary division plane P2 (P21 to P23) and cut.

Here, the secondary splitting plane P <b> 2 is a direction intersecting with the spacer 22. For this reason, an insertion hole 27 into which the wire saw 25 can be inserted is formed in advance at the intersection of each spacer 22 with the planned secondary division surface P2.
Specifically, the insertion hole 27 is processed in the spacer 22 based on the arrangement of the secondary division planned surface P2 that has been found at the planning stage. And (3) When installing the spacer 22 in the support process by a spacer, it adjusts so that the insertion hole 27 may come to the corresponding position of the secondary division plan surface P2.

When performing the secondary division using such a spacer 22, when the wire saw 25 is installed on each of the secondary division scheduled surfaces P <b> 21 to P <b> 23, The insertion hole 27 is inserted.
Then, by running the wire saw 25, the spacer 22 (the upper side of the insertion hole 27, the side close to the residue 1) is also cut together with the intermediate residue block 8, but the opposite side remains uncut and the spacer 22 remains. Maintains the shape of the long material.
Therefore, even by such secondary division, the intermediate residue block 8 can be divided into residue blocks 9 as in the first embodiment.

According to the present embodiment as described above, it is possible to perform the cutting with the wire saw even to the primary division and the secondary division, and it is possible to eliminate all problems caused by blasting.
In addition, it is inevitable that the long spacer 22 intersects the wire saw 25 in a planar arrangement, but by forming the insertion hole 27 in the spacer 22 in advance, the problem of the intersecting portion can be easily solved. Can do.

[Third embodiment]
In this embodiment, (1) after setting the arrangement, each step based on the method for removing a residue of the present invention, that is, (2) lifting the residue, (3) supporting by a spacer, (4) residue This is the same as the first embodiment described above in that the primary division, (5) secondary division of the residue, and (6) extraction of the residual block are performed. The contents of the steps (1) to (3) are also the same as in the first embodiment.
On the other hand, in the present embodiment, (4) primary division of the residue is performed for each section of the residue block 9, and (4) primary division of the residue in each part of the residue 1, (5) secondary of the residue It is assumed that the division and (6) withdrawal of the residual block are performed in parallel.

(4B) Primary division of residue In said 1st embodiment, in cut | disconnecting along the primary division | segmentation planned surface P1 (P11-P13), the wire saw 25 was arrange | positioned so that the residue 1 might be crossed.
In the present embodiment, the wire saw 25 is cut along the primary division planned plane P1 so as to cut a line segment connecting the intersections with the secondary division planned plane P2 (P21 to P23) that become each section of the residual block 9, that is, adjacent to each other. Cut by.

In order to perform such primary division for each section, as shown in FIG. 11, the primary division planned surface P1 to be cut penetrates the residue 1 at the intersection with the secondary division planned surface P2. The through hole 28 is drilled.
First, from the outside of the residue 1, the wire saw 25 is cut so as to pass through the nearest through hole 28 (position of the secondary division planned surface P21) to cut the residue from the secondary division planned surface P21. A section up to one outer periphery (right side in the figure) is cut. Next, the section between the secondary division planned surface P21 and the secondary division planned surface P22 is cut by cutting the wire saw 25 over the through hole 28 (secondary division planned surface P22 position). The

  In FIG. 12, the section from the secondary division planned surface P21 to the outer periphery of the residue 1 (the right side in the figure) is cut, and the section between the next secondary division planned surface P21 and the secondary division planned surface P22 is cut. The state is shown. In the figure, the residue 1 in the section from the secondary division planned plane P21 to the outer periphery of the residue 1 (right side in the figure) is separated as a residue block 9 by secondary division and taken out of the furnace. Yes.

(5B) Secondary division of residue to (6B) Remaining block withdrawal In the above-described (4B) primary division of residue, each section (P21 to outer periphery, P22 to P21, P23 to P22, outer periphery to P23) Are sequentially cut, a series of primary divisions (cuts along the primary division planned plane P1) can be performed.
In the case of performing such primary division for each section, as shown in FIG. 12 or FIG. 11, the primary division scheduled planes P11 to P13 are cut while the both sides of the primary cut are subjected to secondary division. It is possible to proceed to the removal as the residue block 9 by performing. In this case, the intermediate residue block 8 along the primary division planned plane P1 is not formed in an independent form. For example, in FIG. Since the residue block 9 can be obtained by the division, it can be handled as the intermediate residue block 8.

Thus, in this embodiment, in each part of the residue 1, primary division, secondary division, and carry-out can be performed simultaneously in parallel.
Here, the primary division and the secondary division may be sequentially performed in parallel, and the divided residual blocks 9 may be left in their original locations and carried out collectively at the final stage.
Alternatively, the primary division may be sequentially advanced to a state where a plurality of intermediate residue blocks 8 are arranged, and from this state, the secondary division and the unloading may be performed simultaneously.

According to this embodiment as described above, (4) since the primary division of the residue is performed for each partition of the residue block 9, even when the total width of the primary division planned surface P1 is increased, the cutting is performed for each partition. It is possible to cope with a case where the length of the wire saw 25 is finite, and the operation load for cutting can be reduced.
Further, each part of the residue 1 performs (4) primary division of the residue, (5) secondary division of the residue, and (6) extraction of the residual block in parallel, thereby dividing the residual block. 9 can be carried out immediately, congestion in the furnace can be eliminated, and workability of primary division and secondary division performed sequentially can be improved.

Note that the present invention is not limited to the above-described embodiments, and modifications and the like within a scope in which the object of the present invention can be achieved are included in the present invention.
For example, in the previous SL each embodiment, it is assumed to divide the residual iron 1 with three primary dividing surface P1 and three secondary dividing surface P2, these number or divided form suitably be selected in the practice Good.
Furthermore, the arrangement and number of jacks 21 in the embodiment may be changed as appropriate. The recess 23 is formed in the furnace bottom refractory 2 in order to install the jack 21 below the residue 1, but if a jack that can support the residue 1 from the side surface of the residue 1 is used, Processing of the bottom refractory 2 such as the recess 23 can be omitted.

  INDUSTRIAL APPLICABILITY The present invention can be used as a residue removal method for removing solidified residue remaining in a furnace bottom when refurbishing a blast furnace.

The longitudinal cross-sectional view which shows the raising of the residue in 1st embodiment of this invention. The top view which shows lifting of the residue in said 1st embodiment. The longitudinal cross-sectional view which shows insertion of the spacer in said 1st embodiment. The top view which shows insertion of the spacer in said 1st embodiment. The longitudinal cross-sectional view which shows the support by the spacer of the residue in said 1st embodiment. The longitudinal cross-sectional view which shows the secondary division | segmentation by the primary division | segmentation and blasting in said 1st embodiment. The top view which shows the secondary division by the primary division and blasting in said 1st embodiment. The longitudinal section showing secondary division in a second embodiment of the present invention. The top view which shows the secondary division in said 2nd embodiment. The longitudinal cross-sectional view which shows carrying out the primary division thru | or a residue block by the wire saw in 3rd embodiment of this invention. The top view which shows carrying out of the primary division thru | or a residue block in said 3rd embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Residue, 2 ... Furnace bottom refractory material, 3 ... Slag, 4 ... Residue main body, 8 ... Intermediate residue block, 9 ... Residue block, 10 ... Blast furnace, 11 ... Iron skin, 12 ... Refractory material, 13 ... opening for work, 14 ... frame, 15 ... heavy machinery, 21 ... jack, 22 ... spacer, 23 ... recess, 24 ... gap, 25 ... wire saw, 26 ... blasting hole, 27 ... insertion hole, 28 ... through hole , P1, P11, P12, P13 ... primary division planned surface, P2, P21, P22, P23 ... secondary division planned surface.

Claims (10)

When refurbishing the blast furnace, the residue remaining on the bottom refractory is divided and removed to the outside of the furnace as a plurality of residue blocks,
A lifting step of lifting the residue from a furnace refractory by lifting it with a lifting device;
A supporting step of arranging a spacer between the residue and the furnace bottom refractory and supporting the residue with the spacer;
A dividing step of cutting the residue with a wire saw and dividing the residue into the plurality of residue blocks;
An unloading step of sequentially pulling the residue block out of the furnace;
The removal method of the residue characterized by having provided. In the removal method of the residue of Claim 1,
In the lifting step, a plurality of jacks are used as the lifting device, the jacks are installed around the residue, and the entire residue is lifted from the furnace bottom refractory. . In the removal method of the residue of Claim 2,
In the supporting step, after the residue is supported by the spacer, the jack is removed, and then the residue is removed. In the removal method of the residue in any one of Claims 1-3,
The dividing step includes a scheduled division plane setting step for setting a primary division planned plane and a secondary division planned plane that intersect the residue, and a division along the primary division planned plane to form an intermediate residue block. A residue removing method, comprising: a primary dividing step; and a secondary dividing step of dividing the intermediate residue block along the planned secondary division surface to form a residue block. In the removal method of the residue of Claim 4,
The said division | segmentation process uses a wire saw for each of the said primary division | segmentation process and the said secondary division | segmentation process, The removal method of the residue characterized by the above-mentioned. In the removal method of the residue of Claim 4,
In the dividing step, a wire saw is used in the primary dividing step, and blasting is used in the secondary dividing step. In the removal method of the residue of Claim 5 or Claim 6,
Leave perforating the primary dividing plane or secondary dividing surface and sites to the wire saw through hole crossing the front Symbol spacer, wherein the spacer is also cut together with the residual iron by inserting a wire saw into the insertion hole The removal method of the residue characterized by this. In the removal method of the residue of Claim 7,
The spacer is a long shaped steel material, and either one of the primary division planned surface and the secondary division planned surface is set along the longitudinal direction of the spacer, and the insertion hole drilled in the spacer Is a method of removing a residue, characterized in that a wire saw used for either one of the primary division planned surface and the secondary division planned surface is inserted. In the removal method of the residue in any one of Claims 4-8,
In the dividing step, the secondary dividing step is performed in parallel with respect to the already divided intermediate residue block while performing the primary dividing step on a part of the residue. Removal method. In the removal method of the residue in any one of Claims 1-9,
A method for removing residue, wherein the carrying-out step is performed in parallel with respect to the residue block that has already been divided while performing the division step.

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