• GAS DEHYDRATION

    GLYCOL DEHYDRATION

    Gas Dehydration using a glycol solution is a regenerative process through which water is removed from gas streams via contact with a liquid dehydrating agent, most commonly triethylene glycol (TEG). Glycol dehydration partially absorbs other organic compounds such as benzene, toluene, ethylebenzene, and xylene (BTEX).

3D DESIGN
ONSHORE
OFFSHORE
TDE EXPERIENCE AND EXPERTISE

Gas Treating:
Natural Gas Rates: 2 MMSCFD to 800 MMSCFD
Glycol Circulation Rates: 2 USGPM to 1500 USGPM

Engineering
Procurement
Fabrication
Construction and Installation
Commissioning
Operation, Maintenance and Troubleshooting

TDE makes design considerations to maximize flexibility for future expansion at negligible initial incremental cost. With minimal upfront overbuild TDE's Glycol Dehydration Unit Designs incorporate future expandability at a fraction of the cost of a multi-train approach.

TDE offers either our Standard Pre-Engineered Modular Packages or Fully Customized Designs to meet varying project and schedule requirements.

PROCESS DESCRIPTION

Water saturated natural gas is filtered to remove contaminants prior to feeding the glycol contactor where lean glycol contacts the wet gas and absorbs the water. The dehydrated gas exits the contactor and cools the lean glycol stream by cross exchange prior to continuing to downstream units.

The water rich glycol exits the contactor and flows through the reflux condenser coil which cools the still column overheads to minimize glycol losses and preheats the rich glycol prior to feeding the flash drum where hydrocarbon vapours are evolved and separated. The glycol is then filtered and preheated by cross exchange with hot lean glycol prior to feeding the glycol still column for regeneration.

The regenerator boils off water from the glycol which passes through a packed bed and exits the top of the still column for disposal or recovery. Regenerated glycol exits the regenerator where it is cooled and pumped to the contactor. If required a BTEX capture package is added on the still column overheads.

DEHYDRATION DESIGN CONSIDERATIONS

Lean Glycol Concentration
• Basis for dry gas water content
• Typically 98.8 – 99.95 wt% TEG purity

Gas/Liquid Contact
• TEG Circulation rate
• Trays or packing in the contactor

Reboiler Temperature
• Vapourize water content from rich TEG
• Regenerated lean TEG concentration
• Avoid glycol degradation

 

Stripping Gas
• Optional, provides additional water removal
• High purity TEG concentration

BTEX Removal
• By product of TEG dehydration process
• Environmental emissions
• BTEX treatment unit to handle still column vent gas

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