Abstract
A new system of fixing the temperature of hot blast for a blast furnace is proposed. This new system is composed of two or more hot stoves and a temperature equalizer which is a heat accumulator filled with checker bricks. The hot blast from a hot stove, whose temperature changes with the lapse of time, is passed through the temperature equalizer.The hot blast temperature at the exit of the temperature equalizer was calculated in several cases, and the result shows that it can be maintained nearly equal to the average value of the hot blast temperature at the exit of hot stove, as obtained by the staggered-rap-parallel operation.The second proposal is that the heat transfer coefficient of an ordinary Freyn type checker brick can be increased by 2 to 2.6 times by means of setting reduced inner diameter sections at the gas passages.By using these newly designed checker bricks, the fuel gas consumption can be remarkably saved and it becomes possible to obtain the desired hot blast temperature with lower combustion gas temperature.
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