A theory was developed by Linde’s Engineering Division that fouling was causing the trays to flood. Gamma scans were performed at different operating conditions and proved the validity of the theory. Following this, a process simulation conducted by Linde’s Engineering Division demonstrated that the desired product specification can still be achieved when bypassing a part of the liquid. Thus, a bypass line was engineered and installed by hot tapping.
Bypassing a part of the liquid solved the capacity limitation and avoided a costly shutdown of the ECU. Severe fouling was found in the bottom section after the column was opened in a later shutdown.
The presentation will cover the troubleshooting which was based on a tray hydraulics rating, the evaluation of field data and gamma scans, the engineering of the bypass line including an explanation of the column simulation as well as the installation by hot tapping.