Electric heating – Microwave heating – Tunnel furnace
Patent
1979-02-09
1981-03-17
Envall, Jr., Roy N.
Electric heating
Microwave heating
Tunnel furnace
13 26, 13 31R, 219162, 164122, 165 61, F27D 1104, F27D 1106, F27D 900
Patent
active
042569192
ABSTRACT:
Energy efficient reheating furnaces and soaking pits having essentially zero thermal inertia are disclosed.
The furnace comprises an evacuate chamber having a workpiece support, an envelope having a highly infrared reflective interior surface bounding the chamber, and a workpiece heating means comprising electric leads and contacts for heating the workpiece by electrical resistance and/or a cryogenically cooled induction coil located outside of the envelope for heating the workpiece by eddy current dissipation. A workpiece on the support is thermally isolated since convective heat losses are eliminated, conductive heat losses minimized, and radiative heat losses limited to about 10 percent or less of the workpiece's black body radiative flux. Since radiation emitted by the workpiece does not reach the induction coil, the design allows the application of cryogenic-superconductivity technology which eliminates eddy current losses in the coil. The furnace is characterized by dramatic increases in energy efficiency and decreases in material losses by scaling.
The soaking pit comprises an evacuated enclosure having a workpiece support, an infrared-reflective envelope, and electric leads for passing alternating current through a workpiece located on the support. A hot, radiating ingot, when placed in the soaking pit, can be cooled at a controlled rate because essentially its only mechanism of heat loss is by emission of radiation, and the net radiative loss can be adjusted by passing a current through the ingot or reflecting a fraction of the emitted radiation back to the ingot, the remainder being absorbed into the envelope or other structure in the soaking pit.
REFERENCES:
patent: 2848566 (1958-08-01), Limpel
patent: 3095494 (1963-06-01), Denton et al.
patent: 3124634 (1964-03-01), Westeren et al.
patent: 3185460 (1965-05-01), Mescher et al.
patent: 3350494 (1967-10-01), Kunitsky et al.
patent: 3470624 (1969-10-01), Plotkowiak
patent: 3626154 (1971-12-01), Reed
Envall Jr. Roy N.
Pyreflex Corp.
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