On the basis of experimental results and operation data, we made clear that the variation of ηH_2 in an actual furnace fairly reflects the effect of the water gas shift reaction that takes place actively in the temperature range 500°C to 800°C called the low-temperature thermal reserve zone (LTTR zone), and that it is possible to control the temperature level in the shaft by controlling ηH_2. In addition, we presented a new method of measuring the radial η H_2 distribution by shaft probes to determine the location of a LTTR zone which could formerly be confirmed only by measuring the furnace temperature by a vertical probe. It may be said that the new method, which applies the principle of η H_2 decline, permits detecting the location of a LTTR zone more accurately than the conventional method. Since this method indicates the location of a LTTR zone more concretely, it has made it possible to select the optimum action to adjust the burden distribution. As described above, η H_2 can be an important control index in blast furnace operation.
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