EQUIPMENT FOR RECOVERING EXHAUST HEAT IN HOT BLAST STOVE FOR BLAST FURNACE

摘要

PROBLEM TO BE SOLVED: To provide a fuel gas heat exchanger which can restrain corrosion by preventing the sticking of mist and dust in the fuel gas fed into the fuel gas heat exchanger in the exhaust heat recovering equipment of a hot blast stove for a blast furnace to a fin tube. SOLUTION: The exhaust heat recovering equipment of the heat blast stove for a blast furnace is formed of a combustion exhaust gas heat exchanger for a heating heat medium with combustion exhaust gas from the hot blast stove for the blast furnace, a heat exchanger for combustion air for heating up the air for combustion with the heat medium heated in the combustion exhaust gas heat exchanger and further a closed circuit in which the heat medium can be circulated with a heat medium circulating pump in a fuel gas heat exchanger for heating up the fuel gas with the heat medium heated in the combustion exhaust gas heat exchanger. In such a case, a heat medium flowing path 13 composed of fin tubes 13a, 13b in the fuel gas heat exchanger 11 is formed as a flowing path in which the heat medium coming out from the fin tube 13a at the upstream side of the fuel gas is fed to the fin tube 13b at the lowermost stream and further, fed to the upstream side in counterflow to the fuel gas and taken out.