Electric resistance heating devices – Heating devices – Borehole type
Patent
1997-01-30
1999-05-25
Hoang, Tu Ba
Electric resistance heating devices
Heating devices
Borehole type
392302, 392306, 166248, 219553, 422 32, E21B 715
Patent
active
059076623
ABSTRACT:
An electrode well for use in powerline-frequency heating of soils for decontamination of the soil. Heating of soils enables the removal of volatile organic compounds from soil when utilized in combination with vacuum extraction. A preferred embodiment of the electrode well utilizes a mild steel pipe as the current-carrying conductor to at least one stainless steel electrode surrounded by a conductive backfill material, preferably graphite or steel shot. A covering is also provided for electrically insulating the current-carrying pipe. One of the electrode wells is utilized with an extraction well which is under subatmospheric pressure to withdraw the volatile material, such as gasoline and trichioroethylene (TCE) as it is heated.
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Aines Roger D.
Buettner Harley M.
Daily William D.
Newmark Robin L.
Ramirez Abelardo L.
Carnahan L.E.
Hoang Tu Ba
Regents of the University of California
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