KR20080037726A - How to remove the remnants of blast furnace - Google Patents

Abstract

A method of, in the relining of blast furnace, removing any solidified pig iron remaining on the furnace bottom by drawing out the same outside the furnace as divided remaining pig iron blocks. There is provided a method comprising removing any shell at part for drawing out of divided remaining pig iron blocks; making a through-hole under remaining pig iron adapted to permit passage of wire saw therethrough in a furnace bottom refractory under remaining pig iron; passing a wire saw through the through-hole under remaining pig iron; winding the wire saw around the periphery of remaining pig iron; traveling the wire saw so as to vertically cut the remaining pig iron and furnace bottom refractory to thereby effect division into multiple remaining pig iron blocks; and drawing out the remaining pig iron blocks. By this method, any solidified remaining pig iron can be removed safely within a short period of time.

Description

Method of removal of remnant of blast furnace {METHOD OF REMOVING REMAINING PIG IRON FROM BLAST FURNACE}

When repairing a blast furnace, it is related with the removal method of the residual line which can remove | eliminate the residual | hardened | cured solidified by cooling remaining in the furnace bottom of a blast furnace for a short time and safely.

When the blast furnace is repaired, water is melted in the furnace contents remaining in a high-temperature melting state, and the contents are cooled and solidified. This solidified content remains at the bottom of the furnace. Residues with a high specific gravity in the contents remain at the bottom of the furnace and are integrated, and the weight ranges from 300 to 2000 tons. The removal of the residual wire remaining on the bottom of the furnace is an essential step in dismantling the blast furnace main body, and constitutes a critical path in the case of repairing the blast furnace. The removal of the remnants is a very difficult task, and there have been many examples of delays in the renovation period as the demolition did not proceed as scheduled.

Since residual gravity is high in specific gravity and high in hardness, it is considered that a crushing means by blasting is most suitable conventionally as a method of subtracting residual residue in a short time. Dismantling is taking place. Therefore, the technology developed by the remnant demolition method in the number of blast furnaces is a means for efficiently crushing and removing remnants by blasting, and the technology and its mechanization thereof (see Japanese Patent Laid-Open No. 2000-256717). .

Fig. 6A shows an example of the conventional method for removing residual remnants by blasting, and Fig. 6B shows an example of the order of residual remnants by blasting, respectively.

The blast furnace is lined with refractory bricks on the inner circumferential surface of the steel bar 4 surrounding the outer circumference, and fire bricks are laminated on the furnace bottom to form the furnace floor refractory 2.

At the time of blast-furnace repair, in order to remove the residual wire 1 which solidified by cooling, it opens two places in the facing direction of the iron bar part of a furnace bottom part, forms the iron opening part 5 of height 4m x width 4m, Expose (1). A hole for blasting is drilled in the exposed remnant wire 1 by a drill which is a remnant perforator 15. The depth of the blast hole is about 1.5 m. An explosive is loaded into the blasting hole, and the blasting is carried out. The subtracted residual line 1 is taken out by scraping off using heavy machinery 16 such as a bulldozer shovel. By the above operation | movement, it progresses to the center direction of a furnace in the sequential opening part of the outer periphery of a residual line, and remove | disappears by repeating subdivision sequentially from the number (1) shown in FIG. 6B.

However, in the conventional work of dismantling the remnants due to blasting, as a result of the dismantling of the remnants by one blasting, the amount that can be excavated in the core direction is about 1.5 m from the outer periphery of the remnant to reach the remnant center. The number of blasts should be performed according to the distance to the center. Moreover, since the area of a mining site becomes wider as it progresses to a core direction, in order to excavate the distance of 1.5 m from the whole surface of a mining site, a large number of blasting holes and blasting are required. For this reason, although it depends on the residual amount, it takes a very long time to complete the removal of the remnants, and in the past, when the tonnage of 300 tons is removed by blasting, it takes about seven days, In the case of 1500 tons of residual wire, about 14 days were required.

In addition, since the removal method of the residual line by blasting is accompanied by danger, perfect safety measures are needed. In addition, when the residual wire is crushed by blasting, damage is caused to the surrounding equipment due to a storm during blasting, scattering of residual remnants, and the like. Therefore, repair of the damaged equipment is required. In order to prevent damage of this peripheral facility, the small opening part for carrying out residual remnants puts a large cost on safety measures facilities, such as providing a temporary installation for shatterproof curing.

Usually, the mantle to be dismantled is used as a scattering prevention barrier by arranging around the remnant line. However, when the mantle is useful, it is necessary to use a barrier for preventing damage to the mantle due to blasting, and a large curing cost has been put in.

In addition, in order to ensure the safety of the surrounding workers by the blasting work, the time loss of the surrounding work is inevitable such as temporarily stopping the surrounding work and evacuating the worker during the blasting work time. For example, the start of evacuation of the worker around the blasting work starts from one hour before the blasting operation, and for example, 20 times, for example, about two hours until safety is confirmed, such as the explosiveness confirmation after the blasting is completed. In the case of blasting, the evacuation is repeated for each blasting, and the loss time of the surrounding work is about 40 hours.

Accordingly, the present invention provides a method of removing the residual wire that can be safely divided into pieces and removed in a short period of time by wire sawing when the blast furnace is repaired.

The demolition method of the remnant of the present invention is a remnant demolition method of drawing out and removing the divided remnant block, which is drawn out to the outside of the furnace as a remnant block obtained by dividing the solidified remnants remaining on the bottom of the furnace when the blast furnace is repaired. Remove the bark of the part to be cut, drill the residual underhole through hole through which the wire saw is inserted into the furnace bottom refractory under the residual ship, insert the wire saw through the residual through hole, and wind the wire saw around the periphery of the residual ship, The wire saw is driven to cut the residual wire and the furnace floor refractory in the longitudinal direction to divide the residual wire block into a plurality of residual block blocks, and the divided residual block is drawn out of the furnace.

The cutting of the residual line is divided into a plurality of blocks by cutting the residual line and the furnace floor refractory in a vertical direction along a dividing line parallel to the drawing direction of the residual block or the dividing line extending in the drawing direction. The through-hole lower through-hole through which is inserted is drilled in the direction orthogonal to the drawing direction of the remnant block, and the remnant and furnace floor refractory are cut vertically along the dividing line in the direction orthogonal to the drawing direction of the remnant block. Can be divided into blocks Further, any of a plurality of split lines may be cut in parallel with a plurality of wire saws. In addition, when cutting a residual line, you may cut, cooling a wire saw by supplying a cooling fluid continuously to the path | route which a wire saw runs.

When the remnant block is taken out of the furnace, a trolley for removing the remnant block or a mount for removing the remnant block is provided next to the remnant block with the upper surface level at the same level as the bottom surface of the remnant block to be withdrawn. By applying a horizontal force to the block, a slip is generated between the residual block and the remaining furnace floor refractory, and the residual block is moved horizontally in the horizontal direction to be taken out and loaded on the trolley for removing the residual block or the residual block. Jack up the remnant block, and place a moving device for loading the remnant block in the space formed between the remnant block and the remaining furnace floor refractory, under the remnant block, jack down the remnant block to load it on the moving device, The residual moving block may be taken out of the furnace by horizontally moving the loaded moving device.

In the method of removing the residual wire of the present invention, the residual wire is cut into a large residual block by using wire saw, and the residual block is taken out of the furnace, and the residual wire is removed compared to the method of removing the residual residual wire by conventional blasting. Can be safely removed in a short time.

In addition, the gap between the remnant cut portions by the wire saw is about 10 mm, and the gap between the remnant blocks after cutting is narrow, but the cut surface is smooth, and even when the remnants between the blocks are drawn out, a jam due to irregularities between adjacent blocks, etc. Since the cutting surface slips even when the blocks are in contact with each other, the residual block can be easily taken out. From this point of view, it is also possible to remove a residual block having a larger division. In addition, by dividing the dividing line in the drawing direction, the width of the remnant block is widened to make the tip wider, thereby forming an extraction region, and thus, the contact with the adjacent remnant block is eliminated and smooth drawing is possible.

In addition, since the method of dismantling the remnant wire according to the present invention cuts the entire cross section of the remnant wire with wire saw, it is not necessary to take into account the depth of demolition of the remnant which affects the management of the process progress, when dismantling by blasting. Management of work is simple.

Since the method of dismantling the remnants by the wire saw of the present invention does not perform blasting, there is no storm and no scattering of remnants of the remnants, which is safe, and since the construction cost of installing a barrier against them is reduced, the economic effect is also very high. Big.

In the present invention, it is possible to cut a high-temperature residual wire just after cooling solidification by continuously supplying a cooling fluid to the path through which the wire saw travels and cooling the wire saw, thereby shortening the construction period.

In the demolition method of the present invention, since many surfaces can be cut at one time by preparing a plurality of wire saw machines irrespective of the number of divisions of residual lines, the time for cutting any arbitrary surfaces hardly changes and efficient disassembly is achieved. It becomes possible.

When the remnant block is withdrawn from the outside of the furnace, a trolley for carrying out or a takeout block of the remnant block is installed next to the remnant block to load the remnant block, or jack up the remnant block, and load the remnant block to the mobile device to the outside of the furnace. By taking out, it becomes easy to carry out a residual block.

1A is a plan view showing an example of a state in which an iron bar is removed and a dividing line of residual lines.

Fig. 1B is a schematic diagram showing a state of drilling a through hole in the furnace floor firebrick.

1C is a schematic diagram showing a state in which residual wire is cut by wire saws.

1D is a schematic diagram showing an example of drawing out.

1E is a schematic diagram showing an example of drawing out.

2 is a schematic diagram of the wire saw.

Fig. 3A is a plan view showing a dividing line and a drawing direction of residual lines in the present embodiment.

3B is a plan view showing a dividing line and a drawing direction of residual lines in another embodiment.

Fig. 4A is a front view illustrating an example of drawing out divided residual block.

4B is a plan view illustrating an example of drawing out divided residual block.

Fig. 5 is a schematic diagram showing a state where the cut end is blocked with mortar.

Fig. 6A is an image diagram of a remnant demolition work by conventional blasting.

Fig. 6B is a plan view showing an example of the residual line subtraction by blasting.

An embodiment of the present invention will be described with reference to the drawings.

(First embodiment)

When the blast furnace is repaired, as shown in Fig. 1B, the residual remnants 1 cooled and solidified by pouring water remain on the furnace bottom refractory 2 made of a laminated structure such as carbon brick. The slag 3 remaining on the surface of the residual wire 1 is also solidified by cooling.

In the method of dismantling residual wire according to the present embodiment, the residual wire is cut into a wire saw, divided into a plurality of blocks, and the divided residual block is taken out of the furnace.

Hereinafter, the process of the demolition method of this embodiment is demonstrated one by one with reference to FIGS. 1A-1D.

(1) removal of the bar

As shown in Fig. 1A, two bar openings 5 are formed by removing the bark 4 at the position of the remnant line 1 in the lower part of the furnace and at the opposite position. The one bar opening part 5 becomes the operation side of the wire saw machine 7 which the wire saw 6 enters and exits. The other opening part 5 becomes the lead-out side (arrow) of the divided residual block 1a, and is opened by the magnitude | size which can pull out the residual block 1a.

(2) perforation of the residual through hole

As shown in Fig. 1B, in order to wind the wire saw 6 on the residual wire 1, it is necessary to pass the wire saw 6 below the residual wire 1, so that the bottom of the furnace below the residual wire 1 is present. The residual line through hole 8 is formed by the boring machine 9 at any level of the refractory 2. For example, when the outer diameter of the wire saw 6 is about 11 mm, the residual wire bottom through hole 8 is about 65 mm so that the wire saw 6 can travel without difficulty.

(3) cutting by wire saw

The wire saw 6 is widely known, and as shown in Fig. 2, beads 6a made of an abrasive grain layer such as a base metal and diamond beads are provided at intervals on a wire rope which is a metal twist line, The wire rope is coated with resin or rubber 6b. In the present invention, as the wire saw, for example, " Embedded Material Model No. EWLS-255 " used for disassembly and repair of subways, buildings, roads, bridges, and the like can be used.

From the viewpoint of preventing clogging of the diamond beads 6a of the wire saw 6, the residual underhole 8 is preferably drilled at a level close to the bottom plate of the furnace bottom under the furnace bottom refractory 2. When only the metal is cut by the wire saw 6, the metal adheres to the diamond beads 6a of the wire saw 6, and blockage occurs between beads played on the wire, which makes cutting difficult. However, by cutting | disconnecting the residual line 1 and the furnace bottom refractory material simultaneously, favorable cutting | disconnection is attained, without generating a blockage. This is because the cutting powder of the furnace bottom refractory material 2 is adhered to the diamond beads 6a, or there is no adhesiveness and the cutting powder without adhesiveness is interposed so that the cutting powder of the residual wire 1 adheres to the diamond beads. Therefore, it can be considered that the diamond beads 6a always maintain the function of the blade.

At the time of cutting | disconnection, as shown to FIG. 1C, the front end of the wire saw 6 of the wire machine 7 is inserted through the residual line lower through-hole 8 perforated in the furnace bottom refractory 2, and the residual line ( 1) Turn upward and wind around remnant line (1). And the wire saw is run and cut | disconnected. At this time, the running speed of the wire saw 6 is preferably in a range of 20 m / sec to 30 m / sec. If the speed is less than 20 m / sec, efficient cutting becomes difficult, and if it exceeds 30 m / sec, the cutting of the rope of the wire saw 6 increases.

As shown in FIG. 1A, the division of the residual line 1 cut | disconnected by the wire saw 6 is planarly divided, and the dividing line 10 which is parallel to a drawing direction, or the dividing line which becomes wider in a drawing direction ( 11 is cut along the longitudinal direction, preferably in the vertical direction, and divided into two or more residual block blocks 1a.

(4) drawing out remnant blocks

As shown in FIGS. 1D and 1E, the divided remnant block 1a forms a through hole 1b in the up and down direction by core boring, and a wire (1) is formed in the through hole 1b. 12b) is passed through the extraction stand 12 by the hydraulic jack 12a. The furnace floor refractory material 2 is peeled off or collapsed and separated by the large pull-out force at the time of withdrawal.

When pulling out the remnant block to the outside of the furnace, it is installed next to the remnant block at the same level as the bottom surface of the remnant block to be taken out, and is installed next to the remnant block, and the horizontal block is applied to the remnant block to refractory to the furnace floor. A slip is generated between the above remnant line and the furnace floor refractory to move the remnant block horizontally in the horizontal direction to take it out, and to load it on the take-out cart or take-out stand.

Table 1 compares the demolition periods of the method of demolition by wire saw according to the present invention and the method of demolition by demolition by conventional blasting. In addition, the demolition method by the wire saw which concerns on this invention is an example which divided | segmented into three in the residual dose of 300 tons, and five in the residual dose of 1500 tons.

Table 1

Demolition method Residual dose 300 tons 1500 tons Conventional method (method to subtract and remove debris by blasting) 7 days About 14 days The present invention (method of cutting off residual wire with wire saw and removing) About 4 days 7 days

As shown in Table 1, the dismantling method according to the present invention can significantly shorten the dismantling period as compared with the conventional dismantling method. As a result of this shortening, the suspension period of the blast furnace in the number of blast furnaces is shortened by that much, which greatly increases the economic effect associated with production.

(2nd Example)

In the present embodiment, as shown in Figs. 3A and 3B, the residual line 1 is divided into two by the dividing line 10 and removed.

As shown in Fig. 3A, the bark openings 5 are formed on the side from which the bark 4 at the position of the remnant wire 1 is removed to draw the remnant wire. The piercing opening 5 opens to the size which can pull out the divided | segmented remnant block 1a.

The dividing line 10 of the residual wire 1 cut | disconnected by the wire saw is made into the radial direction orthogonal to a drawing direction, planarly, cut | disconnects the residual line 1 in a vertical direction along a dividing line, and divides it into two.

At any level of the furnace bottom refractory 2 below the residual line 1, the residual line lower through hole 8 for passing the wire saw is drilled in the radial direction of the furnace orthogonal to the drawing direction.

The tip of the wire saw is inserted through the residual wire bottom through-hole 8 perforated in the furnace bottom refractory 2, and the wire saw is wound over the residual wire 1 by turning it over the residual wire 1, and then the residual wire is cut by the wire saw and divided. The residual line block 1a is drawn out in the direction of the arrow to the outside of the blast furnace by hanging a wire rope.

In addition, as shown in FIG. 3B, when all the shells around the residual line 1 are removed, the residual block 1a can be pulled out in both directions or in any direction indicated by an arrow.

In this embodiment, since the residual line is divided into two and drawn out, it is effective when the residual amount is relatively small.

(Third Embodiment)

In the present embodiment, as shown in Figs. 4A and 4B, the residual block is drawn out using a moving device.

After dividing the residual wire by the wire saw, jack-up of the residual residual block 1a is jacked up, the extraction stand 12 is extended below the residual block 1a, and the slide plate 13 is moved above the extraction stand 12. After arrange | positioning under the residual block 1a, it jacks down and loads the residual block 1a in the slide plate 13. As shown in FIG. Subsequently, the slide plate 13 on which the residual block 1a is loaded is taken out and slides in the drawing direction by the hydraulic jack 12a on the mount 12. In addition, instead of the slide plate 13, other moving devices, such as a trolley | bogie, can be used.

In this embodiment, the divided remnant blocks can be pulled out with less force as compared with peeling or breaking down the furnace floor refractory and moving it out of the furnace floor refractory.

(Example 4)

The present embodiment is an example in which the wire saw is cooled when the wire saw is cut, thereby making it possible to cut the residual wire having a high temperature.

The heat capacity of the remnant cooled and solidified by main water cooling in the furnace is large, and even after several days, the residual temperature is still high. For example, even if 7 days have passed after completion of the cooling of the main water, the temperature of the residual wire itself is usually 600 ° C or higher. On the other hand, the rubber or resin portion of the wire saw is generally at a heat resistance temperature of 200 ° C. or lower, and since it does not have the heat resistance necessary for cutting a high temperature residual wire, it is difficult to cut the residual wire as it is.

Therefore, in order to cut | disconnect this high temperature residual line while ensuring wire strength, by supplying cooling fluids, such as cooling water and cooling nitrogen continuously, the cutting surface which a wire contacts a high temperature residual line, and the range through which a wire passes a high temperature part are supplied. By cutting the residual wire while generating heat, the residual wire can be cut by the wire saw.

As shown in Fig. 5, after the start of cutting, the cut end is closed with the mortar 14, so that the cooling fluid supplied can be efficiently used.

According to the present invention, since the residual wire can be divided into a large residual block using a wire saw and the large block can be taken out of the furnace, it is safer and more reliable in a shorter time than the conventional method of reducing the residual signal by blasting. The afterglow can be removed, and the industrial applicability of the present invention is very large.

Claims (7)

When the blast furnace is repaired, it is a method of removing the residual wire which is drawn out to the outside of the furnace and removed as the remaining residual block which divided the solidified residual wire remaining on the bottom of the furnace. Remove the bark of the part which draws the divided remnant block, Perforate the remnant bottom through hole through which the wire saw is inserted into the furnace floor refractory under the remnant, A wire saw is inserted through a residual through hole, and the wire saw is also wound around the outer periphery of the residual wire, The wire saw is run and the residual wire and the furnace floor refractory are cut in the longitudinal direction, and divided into a plurality of residual block blocks. A method for dismantling residual remnants, wherein the divided residual blocks are drawn out of the furnace. The method according to claim 1, wherein the remnant line and the furnace floor refractory are cut in a vertical direction along a dividing line parallel to the withdrawal direction of the remnant block or with a dividing line extending in the withdrawing direction, and divided into a plurality of blocks. How to demolish remnants. The method according to claim 2, wherein any of a plurality of divided lines are cut in parallel with a plurality of wire saws. The method according to claim 1, wherein the remnant lower side through hole through which the wire saw is inserted is drilled in a direction orthogonal to the drawing direction of the remnant block, A method of dismantling remnants, characterized by dividing the remnants and the furnace floor refractory in a vertical direction along a dividing line in a direction orthogonal to the drawing direction of the remnants block and dividing it into two residual blocks. The method of removing the residual wire according to any one of claims 1 to 4, wherein, when the residual wire is cut, a cooling fluid is continuously supplied to a path through which the wire saw travels, and the wire saw is cut while cooling the wire saw. The method according to any one of claims 1 to 5, wherein when the remnant block is taken out of the furnace, the trolley for taking out the remnant block or the mount for taking out the remnant block to the same level as the bottom surface of the remnant block to be taken out. Install it next to the remnant block at the top level. By applying a horizontal force to the remnant block, generating a slip between the remnant block and the remaining furnace floor refractory, moving the remnant block horizontally in the horizontal direction, withdrawing it, and loading it on the trolley for carrying out the remnant block or for removing the remnant block. Dismantling method of remnant which is characterized by. The method according to any one of claims 1 to 5, wherein when the residual block is drawn out of the furnace, Jack up the remnant block, A mobile device for loading the residual block in the space formed between the residual block and the remaining furnace floor refractory is disposed under the residual block, Jack down the remnant block to load it onto the mobile device, A method for dismantling remnant lines, wherein the moving device carrying the remnant blocks is horizontally moved to draw out the remnant blocks to the outside of the furnace.

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