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Synopsis: The longitudinal distributions of the temperature and composition of gas in the blast furnace stack have been investigated by the use of vertical probes. The chemical reactions in the stack under 1200•Ž are divided into three main reactions (1) solution loss reaction (2) lime stone decomposition (3) indirect reduction of ores. Each reaction was characterized and defined by its temperature and gas composition variation for unit height as follow. R (reaction rate)=•¢X% (gas composition) /Z(height) The rate constant of these reaction was obtained as follows. k (rate constant)=R/(X%-X*%) X*%: gas composition at equilibrium condition of same temperature The three main reactions in the stack could be separated by obtaining these rate constants. The temperature of thermal reserve zone was about 700•‹•`800•Ž and depended upon operational conditions. The pressure drop of gas in the stack was also measured.

Investigations on the Phenomena in the Blast Furnace Stack by the Use of Vertical Probes