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Repairing method for cooling staveleakage

A repair method and technology of cooling wall, applied in cooling devices, coatings, arc welding equipment, etc., can solve the problems of reduced thermal conductivity and cooling capacity, inability to repair large cracks, etc., and achieve the effect of restoring the cooling function and reducing the repair cost.

Inactive Publication Date: 2008-12-31
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It mainly solves the technical problems that grouting plugging cannot repair large cracks and the heat conduction and cooling capacity decreases after grouting

Method used

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  • Repairing method for cooling staveleakage
  • Repairing method for cooling staveleakage
  • Repairing method for cooling staveleakage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: The material of the stave of the blast furnace is HT150, the specification of the cooling water pipe is Ф44.5×6mm, the specification of the sleeve is Ф63.5×5mm, the leaking part is at the root of the casing and the stave boss, and the cooling water is sprayed. The leak is serious. To this end, adopt the inventive method to carry out leakage repair now, refer to figure 1 , 2 , 3, explain the repair process as follows:

[0020] 1. Using the oxyacetylene flame cutting method, with the stave water pipe as the center, open a hole in the furnace shell 1 with a diameter of Ф180mm.

[0021] 2. Make grooves around the root 3 of the leaking stave water pipe and casing boss to remove cracks and defects such as molding sand, slag inclusions, and looseness on the stave surface. The groove depth is 4-6 mm, and the width on one side is about 15 mm, forming the groove structure of the stave boss at the root of the water pipe 4 and the sleeve pipe 5 .

[0022] 3. Turn off...

Embodiment 2

[0025] Example 2: The material of the stave of the blast furnace is HT150, the specification of the cooling water pipe is Ф44.5×6mm, the specification of the sleeve is Ф63.5×5mm, the leaking part is at the root of the casing and the boss of the stave, and the surface of the cast iron at the boss has There are many loose cavities, and the fusion quality between the weld metal and the cast iron surface during welding is very poor. Many times of welding repairs have not been fundamentally resolved, and the leakage is serious. In this regard, the method of the present invention is now used to repair the leakage, with reference to the attached figure 1 , 2 , 3, explain the repair process as follows:

[0026] 1. Using the oxyacetylene flame cutting method, with the stave water pipe as the center, open a hole in the furnace shell 1 with a diameter of Ф180mm.

[0027] 2. Grooving at the root: groove around the root of the stave of the leaking water pipe (casing) to remove cracks and...

Embodiment 3

[0031] Embodiment 3, first adopt the method of embodiment 1, build up welding on the bottom layer, then use the method of embodiment 2 to coat the polymer metal layer on the build up layer, stick a layer of reinforced carbon fiber again, and finally coat a layer polymer polymer metal. The feasibility and prospect of the expected popularization and application of the invention:

[0032] Leakage of staves is common in the production of blast furnaces in iron and steel enterprises, and it is a practical production problem that is difficult to solve. Leakage of staves will cause erosion of the blast furnace lining and reduce its service life. Iron production capacity. The invention only needs to use the opportunity of the blast furnace shutdown for maintenance to repair the leakage of the stave, and the operation is simple and convenient, and the repair time only needs 6-7 hours. Therefore, it has wide promotion and application value in the iron and steel industry, and the marke...

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Abstract

The invention belongs to a repairing method of iron-making blast furnace equipment, which relates to a cooling wall leakage repairing method. The method mainly solves the technical problems that grouting can stop leakage but can not repair big gaps and the conduction cooling capacity is reduced after grouting. The repairing method of cooling wall leakage is characterized in that the method comprises the following steps of: a. shell opening: including opening holes with apertures of 150 to 250mm on the furnace shell around water pipes on a cooling wall; b. root grooving: including opening grooves at the root part of the cooling wall around the leaking water pipes and sheaths for eliminating cracks as well as molding sand, slag inclusion and loosening on the surface of the cooling wall; c. surface pretreatment: comprising eliminating the grooving parts and residual oxidative metal and oxide films on the surface around the grooves for exposing the metallic luster; d. leakage repairing: the leakage repairing method includes one process of a welding process and a high-molecular polymeric metal bonding process or a composite process combining the two processes; and e. hydrostatic test: after the repairing work, water is supplied for testing the pressure for 30min so as to check the leakage condition. The method is mainly used for repairing cooling wall leakage of blast furnaces.

Description

Technical field: [0001] The invention belongs to a method for repairing ironmaking blast furnace equipment, and in particular relates to a method for repairing leakage of cooling walls in service. Background technique: [0002] The cooling stave is one of the main components of the ironmaking blast furnace. It is installed between the furnace shell and the furnace lining to block the heat transfer from the high temperature in the furnace to the furnace shell and prevent the high temperature deformation of the furnace shell. The stave is integrally cast with a built-in S-shaped seamless steel pipe, and the single weight is generally more than 1.3 tons. After the stave has been used for a long time, due to casting defects of the stave or the fluctuation of the smelting strength of the blast furnace, high temperature cold and hot vibration, etc., there will often be a certain displacement between the stave and the furnace shell. Leakage of cooling water in the stave and separa...

Claims

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Application Information

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IPC IPC(8): C21B7/10B23K9/04B05D7/24
Inventor 王孝建董汉君王布林史文杰尹洪顶
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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