An industrial tunnel oven for heat treatment of parts may include: an outer wall that defines a tunnel; at least one inner wall; and a conveying line, at least partially inside the tunnel, configured to convey the parts along the tunnel. The outer wall may have a substantially cylindrical form above a base zone of the outer wall. The walls may define at least one interspace for hot air entering, leaving, or entering and leaving the oven. The at least one inner wall may extends along sides of the tunnel in an arc so as to define openings for the hot air to flow from the at least one interspace toward the conveying line, from the conveying line toward the at least one interspace, or from the at least one interspace toward the conveying line and from the conveying line toward the at least one interspace.

A drying oven for crosslinking a continuous mat of mineral or plant fibers includes a plurality of heating boxes through which the mat of fibers successively passes. At least one of the boxes includes, between an external insulating jacket of the drying oven and a central compartment of the box, an in-built hot-gas heating and recirculation device that includes at least one radial turbine mounted horizontally, the axis of rotation of which is arranged vertically, the turbine drawing hot gas along the axis through a gas outlet orifice of the central compartment after it has passed through the mat, and discharging it radially toward a recirculation device that recirculates the hot gas leaving the radial turbine to a gas inlet orifice of the compartment, and at least one heating device for heating the gas circulating in the box.

A thermal process device for heat treating a product or plurality of products includes a thermal processing chamber having opposed distal ends and a plurality of controllable heating zones. At least one buffer zone is disposed at each of the distal ends. The buffer zones and heating zones of the thermal processing chamber form a heating element assembly. The heating assembly has an inner and outer surface and a secondary shell is disposed about the outer surface of the heating element assembly and spaced therefrom to form an inlet flow passage for a flow of a temperature adjusting medium along the heating element assembly. A flow directing arrangement is configured to direct the flow of the temperature adjusting medium in the inlet flow passage to the different zones of the heating assembly to adjust the temperature in the heating zones, wherein a majority of the flow of the temperature adjusting medium is delivered to a central zone of the heating temperature assembly and then outward toward at least one of the distal ends.

A device for heating an iron and steel product (steel product), the device including: a preheating chamber for preheating the steel product; a heating chamber for heating the steel product to a desired temperature which is connected to the preheating chamber; a plurality of burners arranged so as to sandwich the steel product from above and below in the heating chamber; and a means for causing an exhaust gas containing combustion gas in the burners to flow into the preheating chamber, wherein the burners form flames with a fuel and an oxidizing agent having an oxygen concentration of 80 vol % or more and have a function of blowing away fats and oils adhered onto the surface of the steel product by the flames, and the preheating chamber has a structure for preheating the steel product by an exhaust gas which has been made to flow thereinto by the means.

A method for combustion in an industrial furnace having fuel and a first oxidizer to heat a material includes arranging at least one lance in a sidewall of the furnace; supplying a second oxidizer with an oxygen content of at least 85 percent by weight in the form of a jet traveling at at least sonic velocity to the interior of the furnace through the at least one lance; running the jet of the second oxidizer in the horizontal plane above the material between and essentially in parallel with two consecutive rows of the roof burners; balancing an amount of the second oxidizer supplied per time unit so that the oxygen content supplied via the second oxidizer constitutes at least 50 percent by weight of the total supplied oxygen per time unit in the furnace.

A stretching unit for stretching a film is disclosed having an oven and a compensation device. The compensation device includes an air conveyor, the first compensation opening and a second compensation opening, in which the first compensation opening and the second compensation opening open into the oven on opposing sides of a central plane (M) of the oven in the vertical and drawing directions (H, R). The air conveyor is located in terms of flow between the first compensation opening and the second compensation opening, in which the compensation device is configured to remove a volume of air from the oven through one of the compensation openings and to feed the removed volume of air into the oven through the other one of the compensation openings.

A shuttle kiln according to certain aspects includes at least one flue channel and multiple flue risers in fluid communication with the flue channel, and at least one shuttle defining multiple exhaust shafts arranged above the multiple flue risers, wherein at least one radiation blockers is arranged above outlet ports of the at least one shuttle. Such a configuration blocks line-of-sight radiant heat transfer between (i) heated surfaces above the shuttle within the kiln housing and (ii) outlet ports of the exhaust shafts, thereby enhancing radiant heat retention and reducing temperature variability within a kiln cavity of the shuttle kiln.