Abstract: The fan blades of a hot gas blower are cooled by the forced passage of cooling air or gas through the blades, the cooling air or gas being vented either into the hot gases or being isolated therefrom and being recirculated after cooling.
Abstract: A scrap metal recycling furnace system comprises a dry hearth furnace, a closed well furnace, an afterburner chamber, a regenerator, a safety cooler and a fume purification plant operably interconnected by a plurality of conduits to form a system wherein exhaust gases from each component of the system can be selectively supplied to at least one other component of the system.
Abstract: The furnace comprises two chambers, a closed well melting chamber and a main heating chamber. The furnace includes a hot gas duct connecting the chambers, the hot gas duct having a damper to control the gas flow between chambers in accordance with the respective condition of each chamber. The furnace is designed to have an efficient liquid metal flow by sloping the floor.
Abstract: A safety door for a furnace or like apparatus is operable to open under the force of a hydraulic cylinder when the pressure under the furnace exceeds a predetermined upper limit corresponding to an abnormally high pressure caused by an explosion within the furnace or like apparatus. The safety door thereby prevents the furnace from being permanently damaged by an explosion.
Abstract: Exhaust gases are constrained to pass through a chamber with walls of heat retaining material. Air to be preheated is passed through pipes within the chamber the pipes transferring heat from the exhaust gases to the air or from the walls to the air when the walls have been preheated to a high temperature.