Method for repairing housing of hot blast heater in late service period

A hot blast stove and furnace skin technology, which is applied in the field of red-burning repair and furnace skin cracking in the later stage of the hot blast stove service, can solve the problems of reduced strength, difficulty in welding, cracking, etc., so as to prolong the service life and prevent deformation and cracking. , to ensure the effect of safe production

Active Publication Date: 2013-09-11
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of repair method is easy to cause such accidents, which happen repeatedly, after a period of time after welding, or even cracking soon; finally, the steel fatigue, strength reduction, and difficult to weld.

Method used

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  • Method for repairing housing of hot blast heater in late service period
  • Method for repairing housing of hot blast heater in late service period
  • Method for repairing housing of hot blast heater in late service period

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Experimental program
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Embodiment

[0043] What present embodiment is repaired is the supporting of volume 1650 cubic meters blast furnace, has used 22 years iron-smelting hot blast stove, and furnace skin cracks 4mm wide crack and furnace skin burns red.

[0044] This embodiment includes the following steps in sequence:

[0045] Ⅰ Restoration of furnace skin cracks

[0046] Stop the hot blast stove, close all valves except the waste gas valve; use compressed air pipes to locally cool down the surrounding area of ​​the running air from the outside.

[0047] The stove skin 1 of the hot-blast stove that the present embodiment modifies cracks 4mm wide crack 8, long 1200mm, see figure 1 , weld the left support frame 4 (its structure is the original "corbel") on the outer surface of the left side of the crack 8 of the furnace skin 1 for restoring the furnace skin 1, and weld on the outer surface of the right side of the crack 8 of the furnace skin 1 For restoring the right support frame 5 of the furnace skin 1, in...

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Abstract

The invention relates to a method for repairing a housing of a hot blast heater in late service period. The method includes steps of I, restoring a housing crack: welding two supports on two outer sides of the crack respectively, adopting two jacks to transversely support between the supports and parts and to jack the cracking crack back from two sides; II, welding the crack: adopting an angle grinder to clean a breach and a crevasse with an angle, bottoming an Austentic 002 stainless steel electrode in the crack and welding into a joint by a common welding electrode; III, reinforcing the housing: arranging an annular belt at the housing crack and hooping the housing; IV, drilling a manhole and scooping residual brick: drilling a circular manhole not smaller than DN600mm in a burned position of the housing and scooping the burned residual brick; V, casting a formwork: blowing the manhole by a compressed air pipe, and fastening a circular steel plate at a hole of the housing and casting; VI, roasting cast materials. By the method for repairing the housing of the hot blast heater in the late service period, the service life of the housing of the hot blast heater is prolonged.

Description

technical field [0001] The invention relates to a method for repairing the skin of a hot blast stove at the later stage of the furnace operation, in detail, it is a repair method for the furnace skin of the hot blast stove to crack and burn red at the later stage of the furnace operation. Background technique [0002] There are still a large number of old-fashioned internal combustion hot blast stoves in the existing blast furnaces. In particular, the hot blast stove of a blast furnace of the applicant has been in production for 22 years since it was put into operation in 1991. Cracking. In 2010, there were 1.3m horizontal cracks and 1.1m vertical cracks in the shape of "doors" at the construction manholes around the manholes on the top of the hot blast stove, and the air leakage was serious. The existing method of repairing the furnace shell at the later stage of the hot blast furnace operation usually adopts the traditional treatment method of directly repairing the cracke...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F27D1/16
Inventor 郝计根王红斌
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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