Process for burning limestone, dolomite or the like and annular shaft furnace for performing the same

摘要

A process for burning and sintering material in lump form in a shaft furnace in which part of the cooling air flowing in a counterflow through the cooling zone is removed from the shaft furnace before the upper end of the cooling zone and is introduced into the column of material in the burning zone area, accompanied by a mixture of air and fuel. As a result a reducing furnace atmosphere is obtained, which extends up to the plane of the upper combustion chambers. The invention also relates to an annular shaft furnace for performing this process.