| 摘要 |
A sealed, negative pressurized, high temperature furnace, through which hydrocarbon contaminated soil is conveyed, is operated in the near-infrared heating region at radiation wavelengths between about 0.75 and about 3.0 um. The furnace, rotary sealed at the input and exit ports and maintained at a negative pressure, is in the form of an elongated cylinder, divided into four series-arranged heating zones, each of which is separately fed by a preferably stoichiometric mixture of a combustible gas, preferably propane and air. The flow of the gas/air mixture into each of the heating zones is regulated so that the first zone is maintained at about 2900 DEG F. normally, (3000 DEG F. maximum), the second zone is maintained at about 2900 DEG F. normally, and the third and fourth heating zones are maintained at about 2900 DEG F. normally.
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