Panel cooled with a fluid for metallurgic furnaces, a cooling system for metallurgic furnaces comprising such a panel and metallurgic furnace incorporating them

A method for cooling walls of a metallurgic furnace including a basin made from refractory material for containment of a metal to be treated and from a peripheral edge of which a shell arises, the shell being closed at a top by a roof, wherein at least one of the shell and the roof includes at least one panel in turn including a first chamber including a face facing towards an interior of the metallurgic furnace and an opposite face being in direct mutual thermal contact with a face of a second chamber whose opposed face faces an external part of the metallurgic furnace, wherein the first chamber and the second chamber are mutually independent, and wherein the first chamber includes an inlet and an outlet of a cooling fluid and the second chamber includes an inlet and an outlet of a cooling fluid, the method comprising:

• making a first cooling fluid pass through the first chamber and making a second cooling fluid, that is different from the first cooling fluid, pass through the second chamber;
• detecting leakages of the first cooling fluid from the first chamber;
• when the leakages are detected, inverting the first cooling fluid and the second cooling fluid by making the second cooling fluid pass through the first chamber and by making the first cooling fluid pass through the second chamber, wherein
• the first cooling fluid is an explosive fluid and the second cooling fluid is a non-explosive fluid in inner working conditions of the metallurgic furnace.