Electric heating – Metal heating – Of cylinders
Patent
1989-11-30
1990-11-27
Leung, Philip H.
Electric heating
Metal heating
Of cylinders
219 1041, 219 1081, 166 60, 166248, 299 14, 405131, H05B 610, E21B 4324
Patent
active
049738119
ABSTRACT:
An RF transmission line is located horizontal to the surface of a region of earth to be decontaminated. The transmission line is driven by a constant current RF source thereby causing induction heating of the soil therebeneath. An array of transmission lines may be required depending upon the size of the area to be decontaminated. The array may be moved slowly along tracks or other mobile carrier, in a direction horizontal to the earth's surface and perpendicular to the transmission line in order to achieve more uniform heating. In an alternative embodiment, a second array may be interspersed with the first array and the RF source switched between the arrays to achieve more uniform heating. Heat losses from recondensation of vapors at the surface and/or from radiation may be reduced by heating the air used for removing the vapors and by providing a radiant surface above the array and heating said array to the desired target temperature.
REFERENCES:
patent: Re30738 (1981-09-01), Bridges et al.
patent: 4116273 (1978-09-01), Fisher et al.
patent: 4320801 (1982-03-01), Rowland et al.
patent: 4485869 (1984-12-01), Sresty et al.
patent: 4670634 (1987-06-01), Bridges et al.
Leung Philip H.
Shell Oil Company
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