CN1208474C - Hot state repair method for blast furnace casing branch element nozzle - Google Patents

Abstract

The invention relates to a repair technology for blast furnace lining refractory materials, in particular to a hot state repair method for blast furnace surrounding tube branch element nozzles. The defect that the inner lining of the nozzle of the existing branch element is damaged and cannot be repaired in a hot state is solved. The technical solution is: the thermal state repair method of the branch nozzle of the blast furnace surrounding pipe, including the following steps: a. The ceramic fiber cushion layer containing the metal skeleton in the branch nozzle is sealed and insulated; b. The inner ring refractory brick is selected to close the door The bricks are first disassembled; c. The ring brick is fixed by welding the flat iron on the surface of the second ring refractory brick to the support of the iron shell of the pipe body; d. The closed door of the repaired refractory brick is selected from the closed door brick. It is mainly used for thermal repair when the inner lining of the branch nozzle of the blast furnace casing is damaged and causes air leakage.

Description

Hot state repair method for blast furnace casing branch element nozzle

1. Technical field

The invention relates to a repair technology for blast furnace lining refractory materials, in particular to a hot state repair method for blast furnace surrounding tube branch element nozzles.

2. Background technology

The air supply branch pipe is the thermal equipment connecting the surrounding pipe and the blast furnace tuyere. It is the only channel for the hot air required to maintain the normal production of the blast furnace to enter the blast furnace. The transition part between the surrounding pipe and the branch pipe is called the branch pipe. The branch pipe is integrated with the surrounding pipe in the inner lining structure, and its masonry method is to build bricks from the nozzle to the center of the surrounding pipe. During the construction of the blast furnace infrastructure, the service life of the branch tubes and surrounding tubes is synchronized with the first generation of the blast furnace (more than ten years). If special measures are not taken, the lining of the branch tubes cannot be repaired in a hot state, otherwise it will cause The overall damage of the branch pipe and surrounding pipe. The actual performance of replacing the inner liner in the hot state has not been reported at home and abroad. In general, the outer packing belt of the metal flange is used to prevent the leakage of hot air and maintain the production of the blast furnace. However, since this method does not repair the inner lining, it is only a temporary measure to treat the symptoms but not the root cause. Any air leakage phenomenon of the blast furnace surrounding pipe branch will directly affect the normal production of the blast furnace, and the blast furnace will be forced to shut down for this reason. Frequent wind breaks not only affect the smoothness of the furnace condition, but also affect the output.

3. Contents of the invention

The technical problem to be solved by the present invention is to provide a blast furnace surrounding pipe branch pipe that can repair the lining of the branch pipe nozzle in a hot state when the lining of the blast furnace surrounding pipe branch nozzle is damaged and causes air leakage. Oral hot state repair method.

The technical solution of the present invention is: a hot state repair method for the branch nozzle of blast furnace surrounding pipe, comprising the following steps: a, sealing and insulating the branch nozzle: sealing the branch nozzle with a ceramic fiber cushion layer containing a metal skeleton Non-repaired parts lined with refractory bricks. b. Disintegration of inner ring refractory bricks: When dismantling the first ring of refractory bricks at the branch nozzle, first disintegrate 1-2 bricks in the ring of refractory bricks, it is best to choose the closing brick, and first cut off the corresponding closing brick The iron shell of the pipe body is used to push out the closing brick from the inside of the pipe along the radial direction of the ring brick. c. Support and fixation of ring bricks: After dismantling 1-2 pieces of refractory bricks in the first ring at the nozzle of the branch and exposing the roots of the second ring of refractory bricks, weld the flat iron on the iron shell of the pipe body close to the surface of the second ring of refractory bricks , and then continue to disassemble the other refractory bricks in the first ring of the branch nozzle. The flat irons for fixing the second ring of refractory bricks are scattered and distributed at 3-6 points, and arch tires can also be set in the branch pipes. d. Closing door of refractory brick after repair: After the refractory brick of branch tube is repaired, the closing door of refractory brick is still at the original closing door brick position of the first ring of refractory brick at the mouth of branch tube. First cut off the metal supporting brick plate at the corresponding position of the closing brick, and drive the closing brick with a wooden hammer from the outside to the inside along the axial direction of the ring brick. The gap between the closing brick and the iron shell of the pipe body is made of refractory plastic filling. After the closing bricks are built, the metal supporting brick boards are welded back and polished smooth.

The beneficial effects of the present invention are: when the inner lining of the branch nozzle of the blast furnace surrounding pipe is damaged and causes air leakage, the refractory brick lining the branch nozzle can be replaced and repaired in time in the hot state, reducing the blast furnace shutdown .

4. Description of drawings

Fig. 1 is the installation location diagram of branch pipe of the present invention

Fig. 2 is a schematic diagram of the position and structure of the plugging ceramic fiber cushion of the present invention

Fig. 3 is a schematic front view of the structure of the branch pipe of the present invention

Fig. 4 is a schematic right view of the structure of the branch pipe of the present invention

In the figure: 1-surrounding pipe, 2-branched pipe, 3-branched pipe, 4-blast furnace, 5-ceramic fiber cushion, 6-metal hook, 7-the first-ring refractory brick, 8-the second ring refractory brick, 9-metal support brick plate, 10-flat iron, 11-pipe iron shell, 12-door brick.

5. Specific implementation

Embodiment 1: Referring to Figure 1, the air supply branch pipe 3 is a thermal equipment connecting the surrounding pipe 1 and the tuyere of the blast furnace 4, and is the only channel for the hot air required to maintain the normal production of the blast furnace to enter the blast furnace 4 furnace. The surrounding pipe 1 and the branch pipe 3 The connecting transition part is called branch tube 2. The branch pipe 2 is integrated with the surrounding pipe 1 in the inner lining structure, and its masonry method is to build bricks from the nozzle to the center of the surrounding pipe. When the inner lining of the branch pipe 2 is damaged and needs to be replaced, the branch pipe 2 port should be sealed and insulated first: Referring to Figure 2, since the implementation of this technology is carried out in the hot state of the blast furnace shutdown, it is effective Plugging and heat insulation is the prerequisite for the implementation of this technology. The ceramic fiber cushion layer 5 containing the metal skeleton is designed and manufactured to block the branch pipe 2 and line the second ring of refractory bricks 8 . The metal hook 6 is included inside the ceramic fiber cushion, which makes the shape of the ceramic fiber cushion 5 convenient for fixing and blocking on the one hand, and is also convenient for removal on the other hand. Referring to Figures 3 and 4, when dismantling the first ring refractory brick 7 of the nozzle, first disassemble the door closing brick 12, first cut off the corresponding pipe body iron shell 11 of the closing door brick 12, and use a jack from the inside of the pipe along the radial direction of the ring brick. The direction will push out the closing door brick 12, thereby facilitating the disintegration of the ring brick. The main principle of this technology is to utilize the instability of its whole structure after the closing door brick 12 of ring brick is disintegrated. In order to ensure that when the refractory bricks lining the branch pipe 2 are disassembled and replaced, the entire branch pipe 2 lining masonry will not be damaged as a whole. Weld flat iron 10 on the pipe body iron shell 11 on 8 sides of refractory bricks, and then continue to disintegrate other refractory bricks in the first ring of branch pipe 2. The flat irons that fix the second ring of refractory bricks are evenly distributed along the circumferential direction at 4 points. The main principle of this technology is to use the relatively independent stability of the ring brick structure after high temperature sintering. When branch element pipe 2 lining refractory brick repairs, the closing door of firebrick is still in the original closing door brick 12 position of branch element pipe mouth first ring refractory brick 7. First cut off the metal supporting brick plate 9 at the corresponding position of the door closing brick 12, and drive the closing door brick 12 from the outside to the inside along the axial direction of the ring brick with a wooden hammer. The gaps are filled with refractory plastic. After the closing brick 12 has been built, the metal supporting brick plate 9 is welded back and polished smooth.

Embodiment 2: set the arch tire in the branch pipe 2, the distribution of the flat iron is 3 points, and the rest are the same as the embodiment 1.

Embodiment 3: the distribution of flat irons is 5 points, and all the other are the same as embodiment 1.

Claims (3)

1, thermal state method for restoring branch pipe orifice of blast furnace bustle pipe is characterized in that may further comprise the steps:

A, branch pipe orifice shutoff are heat insulation: the position that will include the non-repairing of ceramic fiber bed course shutoff branch pipe orifice inner lining refractory block of metallic framework;

B, interior ring refractory brick disintegrate: when the disintegration branch pipe orifice first ring refractory brick, the 1-2 piece brick in this ring refractory brick that disintegrates earlier cuts the corresponding body iron-clad of this refractory brick earlier, with the radial direction of screw block along the ring brick this refractory brick is ejected in managing;

The support fixation of c, ring brick: at the disintegration branch pipe orifice first ring refractory brick 1-2 piece, after exposing the root of the second ring refractory brick, be close to the second ring fire brick surface welding band iron in the body iron-clad, continue other refractory brick of disintegration branch pipe orifice first ring then, the band iron of fixing the second ring refractory brick is with 3-6 point discrete distribution;

D, repair the door that closes of back refractory brick: the reparation of Zhi Yuanguan refractory brick finishes, refractory brick close door still in the former tweel block position of closing of branch pipe orifice first ring refractory brick, cut off the metal brick plate that closes the tweel block correspondence position earlier, closing tweel block will close tweel block with wooden mallet from outside to inside and squeeze into along the axial direction due of ring brick, close the gap plastic refractory filling of tweel block and body iron-clad, close tweel block and build by laying bricks or stones and finish, again the welding of metal brick plate is restored and polish flat.

2, thermal state method for restoring branch pipe orifice of blast furnace bustle pipe according to claim 1 is characterized in that: the first ring refractory brick that at first disintegrates is for closing tweel block.

3, thermal state method for restoring branch pipe orifice of blast furnace bustle pipe according to claim 1 is characterized in that: the arch tire is set in Zhi Yuanguan.

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