Direct Fired Thermal Desorption
Direct Fired Thermal Desorption (DFTD) consists of a counter flow desorber drum and attendant air pollution control equipment. The rotary drum desorber operates the flow of soil counter to the flow of combustion gases. This counter-current and/or parallel flow system provides highly efficient heat transfer and flue gas temperature control.
As the drum rotates, fighting along the drum’s interior surface lifts the soil and drops it in a succession of thin “veils,“ exposing the surface of the soil particles to the stratified temperature profile in the drum, maximizing heat transfer. Prior to soil discharge, water sprays to facilitate dust-free handling cool, treated soils.
Direct Fired Characteristics:
- High throughput
- Simple operation
- Less complicated controls
- Consistent operating parameters
- No secondary materials created during remediation
- Manufacturing time quicker and usually less expensive units
- Known technology worldwide
- Minimum design change to increase unit abilities