Manufacturing method of cross-flow-type tuyere

Abstract

The invention relates to field of blast-furnace tuyeres, and in particular relates to a manufacturing method of a cross-flow-type tuyere. The method is characterized in that the body of a hot-end front cap is molded in an extrusion manner; a spiral water channel made of steel is embedded in the hot-end front cap; welding seams between the hot-end front cap and the body of the hot-end front cap are all positioned at the rear side of a low-temperature area in which the spiral water channel made of steel is positioned. The method comprises the following steps: 1) extruding the body of the hot-end front cap into a double-layer sleeve, wherein the inner layer of the double-layer sleeve is cylindrical and the outer layer of the double-layer sleeve is tapered; 2) sleeving the spiral water channel made of steel on the inner-layer sleeve and expanding the inner-layer sleeve to be tapered, and pressing the spiral water channel made of steel into an interlayer of the double-layer sleeve at the same time so as to form the hot-end front cap; 3) respectively grooving the edges of the inner side and the outer side of the hot-end front cap; 4) assembling and welding so as to obtain a cross-flow-type tuyere finished product. Compared with the prior art, the method provided by the invention has the beneficial effects that the spiral water channel made of steel and the hot-end front cap of the tuyere are connected together in an extruding and hole-expanding manner, so that the production efficiency is greatly improved; the manufacturing cost of raw materials is decreased.

Description

technical field [0001] The invention relates to the field of blast furnace tuyere, in particular to a method for manufacturing a long-life through-flow tuyere. Background technique [0002] The blast furnace tuyere is a key component to ensure the normal production of the blast furnace (generally made of copper, the price is relatively expensive), the use environment of the blast furnace tuyere is extremely harsh, not only to withstand the high temperature of about 1500 ℃ ℃), but also to withstand the erosion of high-temperature iron flow and the wear of furnace charge and slag. Therefore, according to the different use requirements and economic requirements of different blast furnace conditions, blast furnace tuyere with various structures has been designed. Damaged tuyeres need to be replaced by shutting down the wind, and unplanned shutting down of the wind is a taboo in blast furnace production. Therefore, it is of great significance to reduce the damage of tuyeres. [...

AI Technical Summary

Problems solved by technology

The welds of the two tuyeres are prone to cracking and leakage in the high temperature and harsh environment at the front end; in addition, the front caps of the tuyere proposed in the patent No. CN03268410.X "A New Blast Furnace Tue" are all castings, and the castings have a high probability of defects such as pore inclusions , Defects are easy to expand in high temperature and harsh environment, causing water leakage and failure

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