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F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
F28D17/00—Regenerative heat-exchange apparatus in which a stationary intermediate heat-transfer medium or body is contacted successively by each heat-exchange medium, e.g. using granular particles
C—CHEMISTRY; METALLURGY
C21—METALLURGY OF IRON
C21B—MANUFACTURE OF IRON OR STEEL
C21B9/00—Stoves for heating the blast in blast furnaces