Furnace operation includes consecutive cycles of a heating step, a stopping step and a restarting step. The fuel and/or the oxidizing agent is preheated upstream of the furnace by indirect exchange with the discharged fumes through a medium passing through a chamber. A first wall separates the fumes from the medium in the chamber. The fuel and/or oxidizing agent is separated from the medium in the chamber by second wall. During restarting, the medium's flow rate Dm is regulated to limit the heating rate of the first wall until it reaches the operational temperature at an end thereof.

The present application provides a heat exchange assembly for exchanging heat between a coolant and a gaseous medium. The heat exchange assembly may include an outer jacket, a number of gas tubes positioned within the outer jacket, and a self-cleaning system positioned about the gas tubes. The self-cleaning system may include a number of chains extending through the gas tubes.

The present application provides a heat exchange assembly for exchanging heat between a coolant and a gaseous medium. The heat exchange assembly may include an outer jacket, a number of gas tubes positioned within the outer jacket, and a self-cleaning system positioned about the gas tubes. The self-cleaning system may include a number of chains extending through the gas tubes.

Disclosed is a regenerative burner system for use in industrial furnaces, containing at least one burner which generates heat by forming a flame by combining air with a gas contained therein to maximize the use of the heat emitted from the chimney of the furnace; and a regenerator over which a fluid flows, which first stores the heat generated by the burner on a filler with a high heat capacity and then transfers this heat to the fluid, which contains a grate piece which is in an inclined position in the regenerator, has filler on it and passes air flow through the filler, at least one discharge door transferring the end-of-life filler to the basket located outside the regenerator, and at least one filling door transferring the new filler to the chamber located in the regenerator.

A radiative recuperator preheats oxidant and/or fuel for combustion at one or more burners of a furnace. The recuperator includes a duct, at least portions of which comprise a material having a thermal conductivity of greater than 1 W/(m.Math.K), preferably greater than 3 W/(m.Math.K), that receives hot flue gas produced by the burner(s). The duct radiatively transfers heat to oxidant or fuel (for preheating) flowing through one or more metallic pipes disposed in between the duct and an insulating wall.

An enclosure of a steel-making furnace system includes a support structure including a frame that defines an interior, a supply line for supplying a cooling liquid from a reservoir, and a return line fluidly coupled to the supply line and the reservoir. A plurality of panels includes sinuously winding piping having an inlet and an outlet. The inlet is fluidly coupled to the supply line and the outlet is fluidly coupled to the return line. The frame includes a plurality of support members spaced from one another, where each of the plurality of support members defines a slot. Each of the plurality of panels is removably and slidably received with the slot for coupling to the frame.

Operation of a thermochemical regenerator combustion system in which fuel is fed with furnace flue gas into the regenerators to reduce the oxygen content and optionally to establish a reducing atmosphere in both cycles in which the regenerators operate.

A thermochemical regenerator system is operated without encountering accumulation of unwanted solids on the interior surfaces of the passages through which flue gas passes.

Thermal storage unit including: a receptacle including orifices allowing a heat-transfer fluid to be introduced into and extracted, and a stack of bricks, arranged in the receptacle in superposed strata, each stratum having lower and upper large faces and defining a plurality of ducts opening via lower and upper openings, the stack including a pair of strata of a lower and upper stratum, the upper and lower large faces of the lower and upper stratum being separated to define a passage, placing an upper opening of a lower duct of the lower stratum in fluidic communication with at least one lower opening, entirely offset with respect to the upper opening, of at least one upper duct of the upper stratum, the lower large face of the upper stratum closing off, at least partially, the upper opening, when the upper opening is observed, along its axis, from the lower duct.

An example embodiment of the present invention provides a system for preheating ferromagnetic scrap. The system can include a preheating unit that is configured to hold ferromagnetic scrap and to receive hot gases. The preheating unit may include a removable cover that can include an electrical magnet system. The electrical magnet system can comprise an electrical magnet, a lifting device configured to lower and raise the electrical magnet, a power system configured to provide electrical power to the electrical magnet, and an electrical control system configured to operate the magnet. A hot gases cleaning system may be fluidly connected to the preheating unit.