(34g) Troubleshooting Tower Carryover
AIChE Spring Meeting and Global Congress on Process Safety
Monday, March 27, 2017 - 4:50pm to 5:20pm
This article summarizes the lessons learned in debottlenecking a âdirtyâ TEG contactor at our LaBarge Black Canyon Facility in Wyoming US.Â The facility modifications included replacement of all bubble cap trays with fixed valve trays, modifications to the downcomer inlet sump and seal pan, addition of a new Inlet Vane Diffuser at the gas inlet to the tower, a new full stream carbon filtration system, and optimization of the mist eliminator section at the top of the tower. This work was performed in progressive steps between 2001 and 2004. After completion of this work, the following conclusions can be drawn:
- A clean TEG system will minimize foaming and increase capacity as well as decrease maintenance, operating expense and downtime. As demonstrated, the full stream carbon filtration system reduced TEG liquid carryover by 65-70%.
- Although vendor data was available on demisting cyclones with glycol at elevated pressure and good experience was also available with cyclones in hydrocarbon service at high pressure, this application was outside the data range. The entrained liquid load is also an important parameter that often is ignored or is unknown.
- The combination of the high capacity trays and mist elimination equipment, along with the new solvent filtration system, allowed the gas capacity of the Black Canyon Facility to be almost doubled.