Dry hot compressed air for blast furnace - produced using heat exchanger and dehydrator assembly upstream of hot air furnaces

摘要

The air passage between a blower and hot air furnaces for a blast furnace incorporates a dehydrater assembly having a gas permeable rotor impregnated with a regenerative hygroscopic substance and a cooler for condensing the moisture in the air. a heat exchanger is arranged in the passage so that some of the hot compressed air coming from the blower can transfer its heat to the dehydrated air coming from the dehydrated assembly. All the air to be introduced to the hot air furnaces is passed through the dehydrater assembly and the heat exchanger and is dehydrated. It is unnecessary to supply any external hot air to regenerate the rotor. The moisture content of the treated air can be reduced without any significant loss of temp. and pressure. Air leakage between the regenerating and dehydrating zones in the dehydrater is prevented by sealing clearances with packing elements and externally introducing dry pressurised air into the sealed spaces.