Composite refractory material belly pipe

Abstract

The invention discloses a composite refractory material belly pipe. The composite refractory material belly pipe comprises a belly pipe shell. The belly pipe shell is internally provided with a refractory material layer. The refractory material layer comprises a front high-strength abrasion-resisting and fire-resisting pouring layer and a rear refractory material layer body, the rear refractory material layer body is provided with a heat isolation layer, the front high-strength abrasion-resisting and fire-resisting pouring layer, the rear refractory material layer body and the heat isolation layer are formed in a pouring manner on the inner wall face of the belly pipe shell in a covering manner, premature failure of the refractory material at the front end can be avoided, and the service life of the belly pipe is prolonged.

Description

technical field [0001] The invention relates to a straight blow pipe for an iron-making blast furnace air inlet device, in particular to a composite refractory straight blow pipe. Background technique [0002] The air inlet device is the equipment that sends the hot air in the hot blast surrounding pipe of the ironmaking blast furnace into the blast furnace, and the direct blow pipe is the key component of the air inlet device. The shell of the direct blowpipe is made of steel, and the inside is lined with refractory material. Due to the limitation of the surrounding space, it cannot be made too thick, and it is inconvenient to adopt a water-cooled structure. During use, the surface temperature is often high, or even reddened. In severe cases, burn-through occurs, and the wind must be shut down for replacement, which seriously restricts ironmaking production. [0003] Another important reason for the above phenomenon is that the strength and heat insulation performance of r...

AI Technical Summary

Problems solved by technology

At present, there are pouring double-layer refractory direct blow pipes on the market; there are pouring single-layer refractory materials, and refractory felt direct blow pipes are pasted between the refractory materials and the steel shell; These improvements have some beneficial effects. However, the above-mentioned improvements still have obvious shortcomings, that is, the tube body near the front end is thin and the refractory material is thin. Sticking refractory felt, new coal injection gun needs to be inserted into the coal injection gun hole at the front end and the old coal injection gun needs to be replaced.

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