Abstract: A dynamic heat-exchanger with rotor having radial passages disposed, in relation to two circulation ducts, so that there flows radially therethrough, on one sector, a hot fluid flowing in one of the two ducts, and, on another sector, a cold fluid flowing in the other duct. This exchanger comprises a fluid jet cleaner provided for acting by blowing in the passages of the rotor, this blowing taking place between two facing outer and inner sealing zones disposed on the outer and inner cylindrical surfaces of the rotor. This exchanger further comprises a preheater for blowing heated gas through the passages to warm them before hot fluid flows through the passages.

Abstract: The invention relates to an installation for melting pig-iron comprising a cupola furnace, a combustion chamber burning the waste gases leaving this cupola furnace. This installation comprises furthermore a heat exchanger between the flue gases leaving this combustion chamber and a thermodynamic fluid driving at least one rotary machine coupled to at least one electric generator, a superheating furnace for the pig-iron in the liquid state disposed between the cupola furnace and a casting station.