Cylindrical elongated furnace for treating material at high temp

Details Cylindrical elongated furnace for treating material at high temp Cylindrical elongated furnace for treating material at high temp

1975-06-05

1976-11-30

Envall, Jr., R. N.

13 35, 13 31, F27D 100, H05B 300

Patent

active

039951014

ABSTRACT:
A cylindrical elongated furnace for treating material at high temperature in a gaseous atmosphere under high pressure includes a vertical cylindrical pressure chamber for confining gas under pressure and a furnace space surrounded by a cylindrical heater formed of electrical resistor elements and insulation surrounding the furnace space and the heater. The insulation is formed by a cylindrical insulating sheath. The heater is built up of ceramic elements which form a cylinder with annular channels for the electrical resistor elements and supporting insulation surrounding and holding the ceramic elements together, such insulation having a low gas permeability and being formed of several layers of a tight felt impregnated with a hardening component. The leads for the heating elements are flat vertical elements arranged on the outside of the ceramic elements and formed with one or more bights projecting into the annular channels to reduce the free hanging length of the leads.

REFERENCES:
patent: 2035306 (1936-03-01), Fannin
patent: 3654374 (1972-04-01), Scheyer

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