Preheating furnace for elongated material
OwnerFriedrich W. Elhausinventor
Life of this patent
Estimating the term…
Abstract
A preheating furnace for elongated material, particularly bars, billets, and the like of light metal has a furnace tunnel (15) formed by furnace shells (14) for preheating the material (1). At least in their central range the furnace shells are covered by a heat insulation which comprises removably designed insulation members (54,56). The insulation members (54,56) are drawn upwardly above the furnace shells (14) forming an exhaust gas duct (32) in which the furnace tunnel is integrated. Thus a heat insulation for the preheating furnace is provided which is easy to assemble and disassemble and considerably improves the utilization of the heat energy.
Claims8
In a preheating furnace for elongated material, like bars, ingots, billets, and the like of metal, particularly aluminum or aluminum alloys, having a furnace tunnel made of continuous or segmentally joined refractory furnace shells, particularly thin-walled furnace shells, and adapted to be heated by heater elements, like burners, hot gas nozzles, and the like which extend through the walls of the furnace shells and are directed toward the material introduced in longitudinal orientation in the furnace tunnel for direct heating of the same, and further having an exhaust gas duct disposed in the upper range of the furnace, the improvement comprising that the furnace tunnel is at least partly enclosed by the exhaust gas duct thereby providing a heat insulation for the furnace tunnel.
In a furnace group having a preheating furnace in which the exhaust gases of the preheating furnace heat an upstream preheating furnace which passes the exhaust gas through at least one fan to at least one row of slot type nozzles of the upstream preheating furnace arranged along the material and directing the exhaust gas at the material, the improvement wherein the exhaust gas duct at least partly encloses a furnace tunnel of the preheating furnace thereby providing heat insulation for the furnace tunnel and wherein the exhaust gas duct is arranged to be essentially aligned with a furnace space of the upstream preheating furnace having a front end and a rear end which furnace space contains the fan and is likewise protected by a heat insulation, such that said exhaust gas duct opens into said furnace space at the front end thereof.
Dependencies are inferred from the claim text.