Montanuniversität Leoben (Leoben, Austria):

J. Rieger, Mag. Eng., Dr. Min., Chair of Processing Equipment for Environment Protection, Е-mail: johannes.rieger@unileoben.ac.at
Ch. Weiβ, Dr. Eng., Prof., Chair of Processing Equipment for Environment Protection

Voestalpine Stahl GmbH Linz (Linz, Austria):
B. Rummer, Mag. Eng., Blast Furnace Equipment Dept.

Several research activities focus on the optimization of reducing agent requirement of the blast furnace process. Higher injection rates of auxiliary reducing agents result in a decreased RAFT. One counter measure is the raise of the hot blast temperature. Nevertheless the hot blast temperature and the temperature level in the stove are restricted by the known stress corrosion cracking mechanism. Nowadays beside this phenomenon an environmental aspect in form of NOX emission limits further controls the maximum allowable temperature level. Computational Fluid Dynamics (CFD) states a valuable tool to investigate the operational limits of a blast stove. This investigation is devoted to simulation of the process of CO and NO forming during heating in a stove, with varying different technological parameters (roof temperature, excessive air, gas chemical composition). It was shown that excessive temperature of hot blowing can be resulted in decrease of coke consumption in a blast furnace and, respectively, in lowering of carbon dioxide emissions. Consequent improvement of CFD research is based on non-stationary simulation of the complete stove operation cycle, i.e. in the case of changing direction of gas stream

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