Method for preventing intergranular stress corrosion of vault of hot blast heater

A stress corrosion and hot blast stove technology, which is applied in the field of ironmaking hot blast stoves, can solve problems such as cracking of the hot blast stove vaulted shell and intergranular stress corrosion, and achieve the effect of preventing intergranular stress corrosion and inhibiting the formation of NOx

Active Publication Date: 2009-12-16
SHOUGANG CORPORATION
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AI Technical Summary

Problems solved by technology

Whether it is an internal combustion type, an external combustion type or a top combustion type hot blast stove, when the air temperature of the hot blast stove exceeds 1300°C and the temperature of the vault exceeds 1420°C, intergranular stress corrosion will occur on the vault, resulting in cracking of the shell of the hot blast stove vault

Method used

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  • Method for preventing intergranular stress corrosion of vault of hot blast heater
  • Method for preventing intergranular stress corrosion of vault of hot blast heater
  • Method for preventing intergranular stress corrosion of vault of hot blast heater

Examples

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Embodiment Construction

[0032] Figure 1 ~ Figure 4 It is a specific embodiment of the method for preventing intergranular stress corrosion of the dome of the hot blast stove according to the present invention.

[0033] The hot blast stove of the method for preventing intergranular stress corrosion of the hot blast stove vault of the present invention comprises a vault steel shell 1, a burner structure 2, a gas pipeline 3, an air pipeline 4, a vault refractory material 5, checker bricks 6 and a furnace wall 7 . The vault structure of the hot blast stove is as follows: figure 2 As shown, the vault is composed of a vault steel shell 1 and a vault refractory material 5, wherein the vault refractory material 5 consists of spray paint 5-1, aluminum silicate fiber 5-2, clay brick 5-3 and silica brick 5- 4 composition. During the construction or maintenance of the hot blast stove, high-temperature anti-corrosion paint is sprayed on the inner surface of the vault steel shell 1 and the vault silica brick ...

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Abstract

The invention provides a method for preventing intergranular stress corrosion of a vault of a hot blast heater, and belongs to the technical field of ironmaking hot blast heaters. The method is characterized in that: oxidizing air is preheated to a temperature between 800 and 1,200DEG C and is mixed with high-temperature flue gas; the gas mixture is injected into the hot blast heater, and is mixed with separately jetted coal gas to realize high temperature low oxygen combustion and effectively inhibit the generation of NO[X]; and simultaneously, a high-temperature anti-corrosive coating is sprayed on inner surfaces of a steel shell and a refractory material of the vault of the hot blast heater to effectively prevent the intergranular stress corrosion of the vault of the hot blast heater. The method can improve 50 to 100 DEG blast temperature bearing capacity on the basis of the highest blast temperature of the prior hot blast heater.

Description

technical field [0001] The invention belongs to the technical field of iron-making hot blast stoves, and in particular provides a method for preventing intergranular stress corrosion of the vault of the hot blast stove, which adopts high-temperature anti-corrosion paint and high-temperature air combustion technology, which contributes to the high blast temperature and long service life of the hot blast stove. Background technique [0002] With the development of blast furnace ironmaking technology, hot blast stoves are developing towards high blast temperature, long life, large-scale and compact. Increasing the blast temperature is conducive to blast furnace production, improving utilization coefficient, increasing coal injection, saving coke ratio, and reducing production costs. . At present, there are more and more patented technologies for high-temperature hot blast stoves in the world, mainly represented by Hogovin internal combustion hot blast stoves in the Netherlands,...

Claims

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Application Information

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IPC IPC(8): C21B9/00
Inventor 陈冠军胡雄光蔡景春
Owner SHOUGANG CORPORATION
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