• NGL RECOVERY

    HYDROCARBON DEW POINT

    Hydrocarbon Dew Point is a natural gas liquids (NGL) recovery process to control hydrocarbon (HC) and water dew points of natural gas through mechanical refrigeration. The gas stream is chilled to separate HC liquids and contacted with a liquid dehydrating agent, most commonly ethylene glycol (EG) to prevent the formation of hydrates.

3D DESIGN
HC DEW POINT
REFRIGERATION
TDE EXPERIENCE AND EXPERTISE

Natural Gas Rates: 1 MMSCFD to 400 MMSCFD
Dew Point Control: +10°C to -35°C

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 Hydrocarbon Dew Point 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

The inlet gas feed is pre-cooled via heat exchange with the cold gas and liquid streams separated in the low temperature separator (LTS) and is further cooled in the gas chiller using refrigerant grade propane. Lean EG is injected into the exchangers where EG contacts the gas and water is absorbed to prevent hydrate formation.

The chilled stream continues to the LTS, where HC liquids and rich EG are separated from the gas phase at dew point. The residue gas and HC liquids are utilized to recover cooling duty prior to continuing downstream. The rich EG solution is level controlled downstream for regeneration.

HC liquids can be sent downstream to an optional de-ethanizer unit for fractionation, which removes light end components to provide a liquid product for storage or further fractionation. The light components exit the top of the tower to be recycled or continue to other units.

HYDROCARBON DEW POINT DESIGN CONSIDERATIONS

Dew Point Control
• Propane refrigeration cooling to LTS
• Options for higher NGL recovery,
• Joule Thompson (JT) effect
• Turbo expander

Propane Refrigeration
• Compressor capacity and circulation rate
• Minimize compressor horsepower
• Gas chiller evaporating temperature

Chilling Train
• Heat exchangers to recover cooling duty
• Gas chiller sets LTS temperature
• LTS separates residue gas, HC liquids and water

Ethylene Glycol Injection
• Dispersion and injection rate
• Hydrate inhibition at lowest operating temperature
• Vapourize water to regenerate glycol
• Benzene, toluene, ethylbenzene and xylene (BTEX) emissions removal and treatment

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