JP2011074462A - Method for removing stave-cooler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To exchange a stave-cooler without damaging the body of the stave-cooler for remaining flow and the water supply/exhaust tube. <P>SOLUTION: A combining member, which is combined with the stave-cooler 1 projecting from the opening hole 4 in a blast furnace iron-shell 2 to the outside, is removed, and a plurality of blasting chemicals filling holes are bored in a monolithic refractory 9 between the stave-cooler 1 and the blast furnace iron-shell 2 through the opening hole 4 in the blast furnace iron-shell 2 appeared by the removal of the combining member. Then, the blasting chemicals of the amount without affecting the adjacent stave-cooler for existing flow are charged into the blasting chemicals filling hole, and the monolithic refractory 9 is cracked by blasting and the indefinite refractory 9 is crushed with water-jet 13 from the opening hole 4 in the blast furnace iron-shell 2. After removing the stave-cooler by being pushed to the furnace inside from the furnace wall, the stave-cooler is withdrawn to the out of the blast furnace, and after brushing down the remained monolithic refractory 9 into the furnace by utilizing the opening hole part in the blast furnace iron-shell, the stave-cooler for renewing is installed from the furnace inside. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a stave cooler used for cooling a side wall of a blast furnace or the like, and more particularly, to a method for replacing a stave cooler in which a damaged stave cooler is removed and a renewed stave cooler is preinstalled at the place.

  In order to cool the furnace wall of the blast furnace, a number of stave coolers are fixed inside the blast furnace core in the circumferential direction and the vertical direction of the blast furnace. As shown in FIG. 10, in the stave cooler 1, a water supply / drainage extraction pipe 3 is welded to the water supply / drainage port of the cooling water pipe of the stave cooler 1, and the water supply / drainage extraction pipe 3 is connected to the blast furnace gas from the opening 4 of the blast furnace core 2. Projecting to the outside of the blast furnace iron shell 2 through a protective tube 6 fixed to a seal plate 5 blocking the opening 4 so as not to leak outside. The stave cooler 1 is fixed to the blast furnace iron skin 2 with fixing bolts 7. A short tube 8 into which a pressure gauge or a thermometer is inserted is also provided. An amorphous refractory 9 is filled between the stave cooler 1 and the blast furnace core 2.

  When the stave cooler is damaged due to long-term use or abnormal wear, the damaged stave cooler is removed from the furnace wall and then replaced with a replacement stave cooler. In addition, there is known a method of using dynamite blasting for removal of an irregular refractory (see “Prior Art” in Patent Document 1).

  As shown in FIG. 11, the method using the dynamite blast described in Patent Document 1 secures a larger space than the renewal stave cooler 32 in order to remove the damaged stave cooler 31 and attach the renewal stave cooler 32. In order to separately fill the amorphous refractory 33 between the renewal stave cooler 32 and the remaining amorphous refractory 33, it is necessary to remove the residual amorphous refractory 33 on the iron shell 34 side. By performing dynamite blasting 36 in the vicinity of the cooler 35, the remaining amorphous refractory 3 is disassembled.

JP 2000-304456 A

  In the method of removing the irregular refractory by blasting only with dynamite described in Patent Document 1, an impact acts between the damaged stub cooler 1 that needs to be replaced and the adjacent diverted stave cooler 5 and the iron skin 4, and the remaining diverted An excessive force acts on the main body of the stave cooler 5 and the water supply / drainage pipe 7, and (1) the water supply / drainage pipe 7 is destroyed. There is a problem that a gap is formed between the fixed refractory and high temperature gas enters the gap to deteriorate the stave cooler.

  Therefore, the present invention provides a method for replacing a stave cooler that enables replacement of a stave cooler without damaging the main body of the remaining stave cooler and the water supply / drainage pipe when replacing the blast furnace stave cooler using blasting. provide.

  The stave cooler replacement method of the present invention is a stave cooler replacement method in which the damaged stave cooler is removed from the furnace wall of the blast furnace, and the renewal stave cooler is installed at the removed location. The unfixed refractory filled between the stave cooler and the blast furnace iron shell through the opening of the blast furnace iron shell that appears by removing the coupling member is removed from the opening of the blast furnace iron shell. A plurality of blasting agent filling holes are drilled into the blasting agent filling hole, and an amount of blasting agent that does not affect the existing diverting stave cooler adjacent to the blasting agent filling hole is filled and blasted to generate cracks in the amorphous refractory. The refractory that has cracked is crushed by a water jet from the opening of the blast furnace iron skin, removed from the furnace wall by pushing the stave cooler into the furnace, and then removed from the blast furnace. After removing the irregular refractory material remaining between the stave cooler and the blast furnace iron core into the furnace using the opening of the blast furnace iron crust, install the renewal stave cooler to the place where the stave cooler was removed. It is characterized by being installed from the inside.

  In the above-described configuration, an opening for joint cutting is provided in the blast furnace iron skin at the boundary of the existing stave cooler adjacent to the stave cooler to be removed, and a joint between the joint and the joint and the blast furnace iron skin is formed by a water jet from the joint cutting opening. It is characterized by crushing and separating regular refractories.

  Further, the present invention is characterized in that an irregular refractory between the back surface of the stave cooler to be removed and the blast furnace iron shell is discharged, and a gap for filling the irregular refractory is provided. Moreover, the stave cooler is pushed and removed from the outside of the furnace to the inside of the furnace by jacks arranged on a plurality of jack receptacles fixed to the blast furnace iron skin.

  In the present invention, the refractory is first blasted and cracked in the refractory, and then the refractory is crushed by a water jet and discharged out of the system. Therefore, the blasting of the present invention is less impact than the conventional method of crushing the refractory by blasting only with dynamite, so that the impact is weak, and the refractory by the injection of high pressure water by the water jet thereafter. Shatter things. As described above, in the blasting and water jet implementation of the present invention, the impact force between the residual flow stave cooler near the damaged stave cooler and the iron skin is weak, and a small force acts on the water supply / drainage pipe of the residual flow stave cooler in the vicinity. To do. For this reason, destruction of the water supply / drainage pipe does not occur.

In addition, since the impact force acting on the remaining flow stave cooler is small, it is possible to suppress the formation of a gap between the stave cooler and the irregular refractory, so that hot gas during operation enters the gap, There is no deterioration of the stave cooler.
The old castable is removed so that a castable filling gap is provided between the back of the stave cooler to be replaced and the blast furnace body skin. Therefore, after the replacement stave cooler is placed, it is easy to reliably fill the castable and maintain the cooling function. Is possible.

It is a figure which shows the side surface of the state which removed the coupling member. It is a figure which shows the state which punched the chemical | medical agent filling hole for blasting to the refractory material of an iron-skin opening. It is a figure which shows the state which injects super-high pressure water from a water jet nozzle toward an indefinite form refractory. It is explanatory drawing of the operation | work which fixes a suspension chain to the work hole of a stave cooler. It is a figure which shows the state which pushes a stave cooler inside a furnace with a jack. It is a figure which shows the state by which the stave cooler was extruded inside the furnace. It is a figure which shows the state which suspended the renewal stave cooler on the suspension chain. It is a figure which shows the state of pulling up the stave cooler for update to a blast furnace iron skin. It is explanatory drawing of joint area, (a) is a figure which shows a side surface, (b) is a figure which shows the same front. It is a figure which shows the state which has arrange | positioned the stave cooler to the furnace wall. It is explanatory drawing of the replacement | exchange operation | work of the conventional stave cooler.

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

Process 1
In order to remove the stave cooler from the furnace wall, it is necessary to make the stave cooler separable from the blast furnace iron skin.

  Therefore, a stave cooler 1 and a blast furnace core 2 such as a water supply / drainage extraction pipe 3, a seal plate 5, a protective pipe 6, a fixing bolt 7, a short pipe 8, etc., which are shown in FIG. The coupling members that are coupled are cut and removed, so that the stave cooler 1 and the blast furnace core 2 are separable as shown in FIG.

  The opening 4 of the blast furnace iron shell 2 appears by the removal of the coupling member, and the irregular shape filled between the stave cooler 1 and the blast furnace iron core 2 around the cut 10 of the coupling member in the opening of the blast furnace iron shell 2. Refractory 9 appears.

Process 2
In FIG. 2, a plurality of blasting drug filling holes 11 are drilled in the refractory 9 appearing in the opening 4 of the blast furnace core 2 by removing the coupling member. The diameter and number of the blasting chemical filling holes 11 do not affect the remaining stave cooler 12 and the water supply / drainage pipe 3 adjacent to the stave cooler 1 to be removed, and cause cracks in the refractory 9 when blasting. It is determined by the type and size of the blasting agent. For example, when a mini blast having a diameter of 17 mm and a length of 25 mm is used, the blasting drug filling hole 8 has a diameter of 20 mm.

Process 3
After filling the blasting agent into the blasting agent filling hole 11, blasting is performed to cause the amorphous refractory 9 to crack. Since the blasting agent only causes cracks in the amorphous refractory 9, only a small amount is required. The blasting drug is used by processing it into a drug having a small explosive power, for example, a medicine bag of 10 g or less.

Process 4
As shown in FIG. 3, the refractory 9 is crushed by injecting ultra-high pressure water from a water jet nozzle 13 toward the irregular refractory 9 in which a crack has occurred from the opening 4 of the blast furnace iron shell 2. The water jet injects high-pressure water of about 100 MPa or more, and the refractory 9 is cracked and can be easily crushed.

Process 5
In FIG. 4, in order to remove the stave cooler 1 from the furnace wall to the inside of the furnace and remove it outside the furnace, first, the work hole 14 communicating with the inside and outside of the blast furnace iron shell 2 and the stave cooler 1 is penetrated by a drill. The work hole 14 is a hole through which the suspension chain of the electric chain block lowered from the opening formed at the top of the blast furnace is passed.

  Further, as shown in FIG. 5, an opening 17 through which the piston rod 16 of the jack 15 passes is formed in the blast furnace core 2 in order to push the stave cooler 1 toward the inside of the furnace. The jack receiver 15a is fixed to the blast furnace iron skin 2, and the jack 15 is disposed.

  Referring back to FIG. 4, the stave cooler 1 is pushed out into the furnace. The suspension chain 18 of the electric chain block is lowered from the opening formed in the top of the furnace of the blast furnace, and the guide wire 19 connected to the suspension chain 18 is moved to the stave. After being pulled by the pulling rod 20 through the working hole 14 for communicating the cooler 1 and the blast furnace iron skin 2 and pulled out to the outside of the furnace of the blast furnace iron skin 2, the suspension chain 18 is fixed to the stave cooler 1 with a fixing bracket.

  Next, as shown in FIGS. 5 and 6, the stave cooler 1 is pushed into the furnace with the piston rod 16 of the jack 15 and is removed from the furnace wall. The stave cooler 1 separated from the blast furnace core 2 and pushed out to the inside of the furnace is suspended by a suspension chain 18, wound up toward the top of the furnace by an electric chain block, and carried out of the furnace.

Step 6
After the stave cooler 1 has been removed, the amorphous refractory 9 remaining between the stave cooler 1 and the blast furnace core 2 is removed into the furnace by means of the withdrawal using the opening 4 of the blast furnace core 2. .

Step 7
In FIG. 7, the renewal stave cooler 21 is suspended from the opening formed in the top of the blast furnace to the suspension chain 18 of the electric chain block, lowered to the position where the removed stave cooler 1 was, and is placed below the renewal stave cooler 21. The tied wire 22 is hooked with an attracting rod through the opening 4 of the blast furnace core 2 and pulled out of the furnace of the blast furnace core 2, and then the renewal stave cooler 21 is pulled.

  Next, as shown in FIG. 8, the upper portion of the renewal subcooler 21 is pulled up to place the stave cooler 1 on the blast furnace core 2. Thereafter, the stave cooler 1 is fixed to the blast furnace iron shell with fixing bolts, and the water supply / drainage extraction pipe is welded to the water supply / drainage port of the cooling water pipe in the stave cooler. Thereafter, an amorphous refractory is filled between the stave cooler 1 and the blast furnace core 2.

  In this embodiment, the jointed refractory material is efficiently separated from the remaining refractory so that the joint refractory does not remain between the stave cooler to be removed and the remaining-flow stave cooler 12 adjacent to the stave cooler. In addition, the replacement stave cooler can be easily positioned at the position after removal of the refractory.

  In FIG. 9, a plurality of joint cutting holes 22 are drilled in the blast furnace core 2 located at joints on both sides of the stave cooler 1 and the remaining flow stave cooler 12 adjacent to the stave cooler 1. Drilling is performed by setting the core drill motor on the iron skin and moving the drill forward. In addition, since the upper and lower openings 4 of the stave cooler 1 are in the vicinity of the remaining stave cooler 12, the joint cutting hole 22 can be easily jointed by the water jet 13a without providing a perforation. There is no need to provide a hole.

  The joint cutting hole 22 can be jointed by spraying water jet high-pressure water through the joint cutting hole 22 without blasting.

1: Stave cooler 2: Blast furnace core 3: Supply / drainage pipe 4: Opening 5: Seal plate 6: Protective pipe 7: Fixing bolt 8: Short pipe 9: Indeterminate refractory 10: Cut 11: Blasting chemical filling hole 12 : Remaining flow cooler 13: Water jet nozzle 14: Work hole 15: Jack 16: Piston rod 17: Opening 18: Suspension chain 19: Guide wire 20: Pulling rod 21: Renewal stave cooler 22: Joint cutting hole 31 : Damaged stave cooler 32: Renewal stave cooler 33: Residual irregular refractory 34: Iron skin 35: Residual stave cooler 36: Dynamite blasting

Claims (4)

In the method for replacing the stave cooler, remove the damaged stave cooler from the furnace wall of the blast furnace, and install the renewal stave cooler at the removed location.
Remove the coupling member that is connected to the stave cooler and the blast furnace core and protrudes from the opening of the blast furnace core to the outside of the furnace,
Drilling a plurality of blasting chemical filling holes into an amorphous refractory filled between the stave cooler and the blast furnace core through the opening of the blast furnace core that appears by removing the coupling member,
Fill the blasting agent filling hole adjacent to the diverted stave cooler with an amount that does not affect the blasting agent and blast it to generate cracks in the amorphous refractory,
The unshaped refractory with cracks is crushed by a water jet from the opening of the blast furnace iron skin,
After removing the stave cooler from the furnace wall to the inside of the furnace, remove it outside the blast furnace,
After the amorphous refractory material remaining between the stave cooler and the blast furnace iron skin is removed into the furnace using the opening of the blast furnace iron skin,
A method for replacing a stave cooler, wherein the renewal stave cooler is installed from the inside of the furnace to the place where the stave cooler is removed.   An opening for joint cutting is provided in the blast furnace iron skin at the boundary between the stave cooler to be removed and the existing diverted stave cooler, and an unshaped refractory between the joint and the joint and the blast furnace iron core is formed by a water jet from the joint opening. 2. The method of replacing a stave cooler according to claim 1, wherein the stave cooler is separated by crushing.   3. The method for replacing a stave cooler according to claim 1, wherein a gap for discharging the irregular refractory between the rear surface of the stave cooler to be removed and the blast furnace iron shell is provided and the irregular refractory is filled.   The method of removing a stave cooler according to claim 1, 2 or 3, wherein the stave cooler is pushed out of the furnace into the furnace by jacks arranged on a plurality of jack receptacles fixed to the blast furnace iron shell.

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