Gas Dehydration
EG Regeneration
TEG Dehydration & Regeneration
Methanol Recovery
Molecular Sieve Dehydration
Wet natural gas forms solids (hydrates) when operated at low temperatures and high pressures (ideal pipeline conditions). As a result it is important to remove water from natural gas.
As you go down this list, the gas dehydration units offer higher water removal (lower dew points), but increase in complexity, capital and operating costs. The correct unit is selected according to final operating conditions and gas compositions, decided by FEED studies.
EG Regeneration
Ethylene Glycol (EG) is injected into gas to absorb water to reduce possible hydrate formation. AMR Process designs & builds custom EG regeneration units.
Custom design.
Flash drum.
Heat recovery exchanger.
Particulate / carbon filters.
Electric / hot oil / gas fired reboilers.
Optional overhead recovery units.
Reinjection pumps.
TEG Dehydration & Regeneration
Where the client requires lower water dewpoints in the gas than EG injection can provide, Tri-Ethylene Glycol (TEG) dehydration & regeneration is utilized.
Custom design.
Pre filter-separator.
High efficiency absorption tower.
Downstream liquid scrubber.
Reflux coil.
Flash drum.
Particulate / carbon filters.
Heat recovery exchangers.
Electric / hot oil / gas fired reboilers.
Optional stripping columns for high purity TEG regeneration.
Surge vessel.
Optional chemical injection package.
Optional glycol storage tanks.
Reinjection pumps.
High H2S and CO2 designs.
Methanol Recovery
Methanol injection is used to prevent hydrate formation. Historically methanol is lost to the process. Where methanol recovery is important due to remote or offshore locations, complicated azeotrope distillation is required. Experience is necessary to correctly design these complicated units.
Custom design.
Optional carbon filters.
Heat recovery exchanger.
Azeotrope distillation tower.
Reflux and reboiler systems.
Molecular Sieve Dehydration
When super dehydration of gas is required, molecular sieve units are utilized. They consist of an absorption bed that absorbs the water. Dry gas is then used to regenerate the bed, stripping the water from the molecular sieve. It is a some what expensive process as it requires specialized high temperature regeneration equipment.
Custom design.
Inlet filter separators and coolers.
2-3-4 absorber tower configurations.
Downstream filters.
Salt bath / hot oil regeneration gas heating system.
High temperature, absorption / regeneration cycles change over controls.
Regeneration gas cooler and separator.