A method for repairing the gooseneck under the hot air surrounding pipe of a blast furnace air supply system

Abstract

The invention relates to a method for repairing a goose neck part under a hot blast bustle pipe of a blast furnace air supply system. The method comprises the following steps that positioning and forming a hole are carried out, a pouring groove is fixed in the hole part, a sealing plate is fixed at the bottom of the groove, the sealing plate penetrates through the lower edge of the hole and extends into the hole, an exhaust pipe is mounted on the sealing plate at the bottom of the groove, and high-strength ceramic castable is poured from the upper port of the pouring groove; after the castableis dried and shaped, the pouring groove and the sealing plate at the bottom of the pouring groove are removed, and a layer of zirconium-containing ceramic fiber felt is laid; and a new grouting pipehead is welded on a hot blast bustle pipe steel plate which is taken down through the first step of cutting and holing, and then the hot blast bustle pipe steel plate is welded on the original cuttinghole (hole recovery), the grouting pipe head is grouted to to fill pores in a bustle pipe steel casing. After the treatment is finished, the section structure of the goose neck part sequentially comprises a working layer refractory brick, a high-aluminum heat-insulating brick, a high-strength ceramic castable, a grouting material, the zirconium-containing ceramic fiber felt and the bustle pipe steel casing, so that a good heat preservation and heat insulation effect is achieved, and the phenomenon that of the temperature of the goose neck part is so high that the production is restrictet is avoided.

Description

technical field [0001] The invention belongs to the technical field of fault treatment of blast furnace air supply system, in particular to a method for repairing the goose neck under the hot blast surrounding pipe of the blast furnace air supply system. Background technique [0002] Due to construction quality and other reasons at the lower gooseneck of the blast furnace air supply system, the temperature of this part will be higher than 350°C during the blast furnace air supply. Since the gooseneck is located under the hot air surrounding pipe, conventional methods cannot be used for pouring from top to bottom, and passive control is usually carried out by blowing compressed air. Not only was a large amount of compressed air wasted, but also the high-temperature gas with a temperature greater than 1100°C accumulated in the cracks of the refractory bricks for a long time will cause the high-alumina heat-insulation bricks with low refractoriness and weak resistance to burnin...

AI Technical Summary

Problems solved by technology

Not only was a large amount of compressed air wasted, but also the high-temperature gas with a temperature greater than 1100°C accumulated in the cracks of the refractory bricks for a long time will cause the high-alumina heat-insulation bricks with low refractoriness and weak resistance to burning loss in the gooseneck, The clay heat insulation bricks were burnt, and a large area of ​​hollow area was formed in the gooseneck. After 6 to 12 months of operation, there would be a large area of ​​redness or even burn-through at the connection part of the gooseneck and the lower part of the surrounding pipe, resulting in accidents such as blast furnace Wind break, affecting production

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