Ex Situ Electric Resistance Heated Screws Conveyors

The design of electric resistance heated screws is similar to the hot oil heated screws, except that electric resistance elements are attached to the outer wall of the screw conveyors for heating. The soil is heated up to 1100°C by a combination of conduction and radiation from the heated outer wall. Several such heated screws are manifolded together to make a unit of commercial capacity. PCBs, and other VOCs, and SVOCs can be effectively removed using this high-temperature thermal desorption system. The desorbed gases from the heated screws can be collected and treated in either condensation or afterburner gas systems.

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