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Maintenance method for air leakage from pipeline of hot-air system of blast furnace

A hot blast system and pipeline technology, applied in blast furnaces, blast furnace details, blast furnace parts and other directions, can solve problems such as taking a long time and affecting blast furnace production process production, shortening the time for shutdown and maintenance, and ensuring construction safety and construction. Efficiency, the effect of reducing economic losses

Active Publication Date: 2013-09-04
XINXING DUCTILE IRON PIPES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this treatment method, it takes at least 3 days for the furnace cooling step alone, and the entire repair process takes a long time, which seriously affects the production of the blast furnace and the subsequent production process.

Method used

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  • Maintenance method for air leakage from pipeline of hot-air system of blast furnace
  • Maintenance method for air leakage from pipeline of hot-air system of blast furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] On May 6, 2006, Xinxing Casting Pipe Co., Ltd. Wu'an Industrial Zone No. 1 Ironmaking 1#460m 3 The top of the blast furnace hot air surrounding pipe suddenly ran out of wind, and a 0.4m crack appeared in the pipe shell. According to the method of the present invention, the repair was carried out. The construction equipment used: 1 powerful mixer, 1 set of vibrating rods, 1 set of electric welding tools, 1 set of gas welding tools, 1 set of grouting equipment, 1 1.5m crowbar;

[0024] Construction materials: δ=2mm steel plate, 1.2mm diameter iron wire 20m, pipe shell and other thickness shell steel plate 1m 2 1m of machine-made fiberboard with a thickness of 20mm 2 , Non-aqueous press-feed material 1 ton.

[0025] The specific operation steps are as follows:

[0026] 1. Shut down the blast furnace in an emergency, and close all the hot blast valves; the thickness of the pipe shell 1 is 10mm, open the pipe shell 1 at the place where the wind runs, and the arc surface a...

Embodiment 2

[0036] On August 17, 2007, Xinxing Casting Pipe Co., Ltd.’s No. 2 Ironmaking 2# Blast Furnace and 2# Hot Blast Stove’s three-fork position has been operating for many years. The position of the 2# Hot Blast Stove’s three-fork position has run out of air, and the middle of 1# and 2# Hot Blast Stoves There is a phenomenon that the pipe is burning red. Open the air running position and the red tube position and found that there are about 500mm*500mm square collapsed bricks in the running wind position, and the refractory brick at the top of the red tube position sinks about 100mm as a whole. From this, it can be inferred that the top liner of the pipeline about 10m long from the 2# hot blast stove to the vertical pipe has been damaged and needs to be overhauled.

[0037] Carry out emergency repair according to the method of the present invention, used construction equipment: 1 powerful mixer, 1 set of vibrating rods, 1 set of electric welding tools, 1 set of gas welding tools, 1 ...

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Abstract

The invention discloses a maintenance method for air leakage from a pipeline of a hot-air system of a blast furnace, and belongs to the treatment method of the air leakage from the pipeline. The method comprises the following steps of: firstly treating a position from which the air leaks; opening a notch on a fire-proofing tile; lifting a prepared steel plate at the notch along the inner wall of the fire-proofing tile; pouring a high-alumina castable along the steel plate, thereby forming a casting layer corresponding to the fire-proofing tile; shielding a machine-made fiberboard on the casting layer; and restoring a pipeline casing and grouting. According to the method, the damaged fire-proofing tile is repaired and treated outside the pipeline from which the air leaks, so that the time for wanting the furnace to be cooled is omitted. Thus, the maintenance time of the blast furnace in a shutdown manner is shortened greatly; the working efficiency is improved; and the economic loss caused by the furnace shutdown is reduced. For different damaging areas, the different treatment schemes are put forward, so that the construction safety and the construction efficiency of a worker are ensured. The method is also suitable for various pipelines and can be applied widely.

Description

technical field [0001] The invention relates to the technical field of blast furnace construction. Background technique [0002] During the production process of the blast furnace, due to the influence of various factors such as the welding quality of the pipeline, the quality of the masonry, the quality of the material, and the operation in the production process, the pipeline of the hot blast system will have the situation that the pipeline runs out of air. Usually, the treatment plan for the air run-off in the pipeline of the hot blast system is: shut down the blast furnace, open the pipeline to find out the cause after the pipeline cools down, and the staff enter the pipeline to re-build the refractory lining damaged during the wind run, repair the pipe shell, and press grouting . However, in this treatment method, it takes at least 3 days to cool the furnace alone, plus the time spent in other steps, the entire repair process takes a long time, which seriously affects ...

Claims

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Application Information

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IPC IPC(8): C21B9/10
Inventor 宋延琦常金铃邓辉徐常志
Owner XINXING DUCTILE IRON PIPES CO LTD
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