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AssigneesAcon Finland Oy Ltd, Rautaruukki Oy
InventorsJohannes Sallinen, Pekka Mantyla
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The invention relates to a method and apparatus for improving the performance of a heating furnace for metal slabs. The elongated heating furnace includes a water cooled conveyor track for carrying metal slabs through the heating furnace and at least one fossil-fuel operated burner for heating metal slabs. The heating furnace includes a convection zone wherein metal slabs are heated primarily by the action of convection heat delivered by combustion gases driven therethrough, and a heating zone wherein metal slabs are heated primarily by the action of radiation heat emitted by the burner located therein. In addition, the metal slabs are heated by at least one radiant heater which is positioned at a location spaced apart from said burner in the longitudinal direction of the heating furnace for reducing the depthwise temperature differences developing in the metal slabs in the heating furnace and/or for increasing the capacity of the heating furnace.
Method for heating metal slabs in an elongated heating furnace, said heating furnace including means for carrying metal slabs through the heating furnace and at least one fossil-fuel operated burner for heating the metal slabs, said heating furnace further including a convection zone without burners wherein the metal slabs are heated primarily by the action of convection heat delivered by combustion gases driven therethrough, and a heating zone wherein the metal slabs are heated primarily by the action of radiation heat emitted by the fossil-fuel operated burner which is located therein, comprising the steps of:
An elongated heating furnace for heating metal slabs comprising:
Dependencies are inferred from the claim text.