Jet implement radiation furnace, method and apparatus
AssigneeThermo Electron Corporation
InventorsLazaros J. Lazaridis, Gabor Miskolczy, Paul K. Shefsiek
Life of this patent
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Abstract
A furnace for heat treating metal slabs or strips includes a heating chamber through which stock is passed in confronting relationship to an array of jet impingement radiation burners. Combustion is separated from the stock by flat refractory plates having a plurality of holes uniformly distributed thereover which direct uniform jets of combustion products upon the strip or slab. The jets of combustion products heat the work by convection. Also, the refractory jet forming plates are heated to radiance so that heat energy is transferred to the work by radiation.
Claims8
The method of heating flat strip stock comprising the steps of:
- supporting the stock in a furnace chamber below combustion chamber means and separated therefrom by an array of flat refractory plates lying in a common plane, said plates having a plurality of apertures therethrough of substantially equal size perpendicular to said common plane and distributed substantially evenly across said plates;
- producing essentially complete combustion in the combustion chamber means for heating the array of plates to radiance at a temperature above approximately 1200.degree. F.;
- directing a flow of combustion products from said combustion chamber means through the apertures in the plates as uniform, discrete jets;
- producing a pressure drop across said plates of sufficient magnitude that the jets are turbulent after emerging from the apertures in the plates;
- positioning the stock in the furnace chamber such that a horizontal surface thereof confronts the plates, said horizontal surface being positioned in the zone of maximum turbulence of said jets;
- and
- continuously advancing the flat strip stock through the furnace chamber whereby said stock is heated simultaneously by convection from direct contact with said turbulent jets and by radiation from said plates, said convection and said radiation each contributing a substantial fraction of the total heat transferred to the stock.
A furnace for heating;
- metal stock comprising:
- an elongated furnace chamber for receiving stock to be heated, said stock having a substantially planar surface;
- means for continuously advancing the stock through said chamber;
- an array of combustion chambers positioned above said furnace chamber for directing products of combustion thereinto;
- a flat, heat radiative plate interposed between each said combustion chamber and said furnace chamber, said plates lying in a common plane confronting the flat surface of the stock to be heated and having a plurality of openings perpendicularly therethrough, the openings being of substantially equal size and evenly distributed over the surface of said plates, said plates positioned closely adjacent each other for sealing said combustion chambers from said furnace chamber so products of combustion enter said furnace chamber from said combustion chambers only through said openings;
- forced combustion means associated with said combustion chambers for producing essentially complete combustion within said combustion chambers and for producing a pressure drop across each said plate sufficient to expel turbulent jets of combustion products therefrom through said openings;
- and
- means for supporting the stock to be heated within said furnace chamber so that the upper planar surface of such stock will be in the zone of maximum turbulence of the jets of combustion products issuing from said openings and will be heated by convection from direct contact with said jets and by radiation from said plates in a manner such that both the convective and radiant contributions are substantial.
Dependencies are inferred from the claim text.