| 摘要 |
PURPOSE:To properly cool wall of a blast furnace and stabilize the operation of the furnace, by blowing a cooling medium into the furnace from through holes in the wall and controlling the amt. of the cooling medium blown according to the temp. of the internal part of the furnace close to the through holes. CONSTITUTION:Water or a water-gaseous N2 mixture as a cooling medium is blown into a blast furnace from blowing nozzles 13 through a cooling pipe 14, an on-off valve 15 and flow rate regulating valves 16 to cool the wall 10 of the furnace by the heat of evaporation of the water. At this time, the temp. of the wall 10 is measured with a thermometer 17-1 for the interior of the furnace, a thermometer 17-2 for the shell 11 and a thermometer 17-3 for a stave and the measured value is inputted in a control relay 18. This relay 18 decides the degree of opening of each of the valves 16 according to the inputted temp. and instructs the valves 16 on the degree of opening so that a proper amt. of the cooling medium is blown into the furnace. Thus, the wall of the furnace is properly cooled by the cooling medium at all times and furnace cooling due to deficient soaking is not caused.
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