Double layer fireproof linings branch blast tube of blast furnace

Abstract

Disclosed is a double layer fireproof linings branch blast tube of blast furnace comprising an outer steel housing, an heat-insulation layer, a working lining, the heat-insulation layer is lightweight casting material with an anchoring structure, whose height range is 3-12 mm, the working lining is casting material, the thickness of the heat-insulation layer is greater than 20mm, the thickness of the working lining is between 70-150mm.

Description

technical field [0001] The invention relates to a blast furnace refractory material and blast furnace process equipment, in particular to a double-layer refractory-lined blast furnace air supply branch pipe. Background technique [0002] There are mainly four types of existing air supply branch pipes. The first type is to set a single refractory lining inside the steel shell, and use amorphous refractory castables to cast the refractory lining. Although this kind of refractory lining is easy to manufacture, the surface temperature of the steel shell High, such as a certain 3200m 3 The surface temperature of the steel shell of the blast furnace is about 400°C. The refractory lining is exposed to high temperature differences for a long time. The working surface is 1000-1200°C and the outer surface is 300-400°C. Ring and strip cracks are prone to appear, causing redness and damage to the steel shell; The second is to set the refractory fiber layer and the refractory castable i...

AI Technical Summary

Problems solved by technology

[0002] There are mainly four types of existing air supply branch pipes. The first type is to set a single refractory lining inside the steel shell, and use amorphous refractory castables to cast the refractory lining. Although this kind of refractory lining is easy to manufacture, the surface temperature of the steel shell High, such as a certain 3200m 3 The surface temperature of the steel shell of the blast furnace is about 400°C. The refractory lining is exposed to high temperature differences for a long time. The working surface is 1000-1200°C and the outer surface is 300-400°C. Ring and strip cracks are prone to appear, causing redness and damage to the steel shell; The second is to set the refractory fiber layer and the refractory castable in the outer steel shell to cast the refractory lining. The advantage of this air supply branch pipe is that the surface temperature of the steel shell is low, and the disadvantage is that the stability of the refractory lining is poor. Once the refractory lining cracks, Refractory fibers cannot guarantee that the steel shell will not turn red for a long time; the third is to set refractory castables and refractory bricks in the outer steel shell. Dense high-strength castable, this kind of structure has good stability and long service life. The disadvantages are that the refractory bricks are complex in shape, long in the processing cycle, expensive in refractory bricks, complicated in branch pipe making, high in cost, and high in the surface temperature of the steel shell; the fourth type It adopts refractory fibers, refractory castables and refractory bricks in the outer steel shell. The advantage is that the surface temperature of the steel shell is low. The disadvantage is that the branch pipe is more complicated to make and the cost is higher.

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