Hazardous or toxic waste destruction or containment – Containment – Solidification – vitrification – or cementation
Patent
1996-10-09
1998-01-20
Tsang, Cecilia J.
Hazardous or toxic waste destruction or containment
Containment
Solidification, vitrification, or cementation
588209, 588228, 588900, 20415715, 2041582, 20415821, 110346, 422199, A62D 300
Patent
active
057103607
ABSTRACT:
A thermal desorption system for treating and/or removing contaminants from various types of materials employs an induction tube furnace to heat the material to a high enough temperature to completely desorb it. The induction tube furnace includes a metal or metal alloy susceptor tube for containing the material to be treated and at least one induction coil surrounding the tube for heating the same. The susceptor tube is formed from a metal or metal alloy, such as a nickel based alloy, having a very high melting temperature which will allow it to be heated by the induction coil to temperatures as high as 1800.degree. F. The metal or metal alloy also has a relatively high electrical resistance to permit efficient magnetic coupling of energy from the induction coil to the tube, as well as a relatively high thermal conductivity to provide efficient heat transfer from the tube to the material to be treated. Depending upon the nature of the material to be treated, an auger type conveyor can be employed to move the material through the susceptor tube at a controlled rate of speed, which in turn controls the residence time of the material in the tube, and therefore the temperature to which it is heated. An inert atmosphere is maintained within the tube to prevent combustion of the material, and the vaporized contaminants exiting the susceptor tube are condensed for recovery and recycling, while the desorbed material in the form of char is removed for disposal in a conventional manner.
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Olexy Robert A.
Self John R.
Delacroix-Muirheid C.
Tsang Cecilia J.
Vanish, Inc.
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