Optimization

of

Thermal Phase Separation Technology




Overview

Thermal Phase Separation (TPS) is an advanced thermal desorption process used for the treatment of soils and sludges contaminated with chlorinated hydrocarbons such as PCBs. The TPS is a two-stage process. The first stage is the separation process where the organics are removed from the soil or sludge. The second stage involves the clean-up and treatment of air, water, and contaminates. This project involves examining the existing TPS unit and recommending changes that improve the overall efficiency of the system. The two main target areas were the gas and water cleanup systems. Within these systems a few main components were identified and redesigned to optimize their performance.


Areas of Focus

Cooling of the discharge soil.

A heat exchanger was recommended to improve soil cooling after the thermal desorption process. This heat exchanger was an auger assembly with a cooled jacket and internally cooled auger flights.

Dust removal.

It was recommended that a cyclone be placed in the lines transporting the hot gasses from the desorption chamber. The cyclone will remove dust from the line and prevent it from entering the quench chamber.

Cooling of gases from the desorption chamber.

Several changes were recommended for the quench which cools these hot gasses. The changes include new spray nozzles, a static mixer, and mist elimination baffles. The changes will improve the efficiency of the quench process.

Liquid sludge separation.

The liquid / sludge separation holding box was redesigned to improve the separation efficiency.


Conclusion

These recommendations will improve the efficiency of the TPS process and reduce operational costs.


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