HOT-BLAST BRANCH PIPE STRUCTURE OF BLAST FURNACE HOT STOVE AND HOT-BLAST BRANCH PIPE

摘要

Provided is a method for constructing a hot-blast branch pipe of a blast furnace hot stove that eliminates the need for expansion joints in order to avoid expansion-joint-related problems of various kinds. In consideration of the thermal expansion difference (d) between a blast furnace body (1) and an upright hot-blast branch pipe section (5) when the temperature of the blast furnace is increased in a dry state, the height of the connecting position of upright hot-blast branch pipe section (5) to the blast furnace body (1) is set higher than the height of the connecting position of the blast furnace body (1) to the upright hot-blast branch pipe section (5) by the thermal expansion difference absorption margin of s = 0.26d - d during the initial installation. By setting the respective lengths of the upright section and horizontal sections of the hot-blast branch pipe three or more times greater than the respective pipe diameters, differences in thermal displacement and the thermal displacements themselves can be absorbed by means of elastic deformation of the pipes themselves. As a result, there is no longer any need for the use of any expansion joints, so expansion-joint-related problems of various kinds can be avoided.