Dehydration
Produced gas is sometimes saturated with water, which must be removed for further process. Removal of water vapor from natural gas to meet sales specifications, dehydration, is commonly done in gas processing plants.
NoDoC provides cost estimation model for three 3 common types of Glycol that is used for Gas Dehydration:
• Mono-Ethylene Glycol (MEG),
• Di-Ethylene Glycol (DEG),
• Tri-Ethylene Glycol (TEG),
• Tetra-ethylene glycol (TREG).
The type of Glycol used and the package design depends on several factors, and the end-users specific requirements and objectives for the gas stream being processed.
Triethylene glycol (TEG) is almost exclusively used for this purpose. TEG absorbs water from the gas. To remove the water from the TEG, the TEG is heated to above the boiling point of water causing the water vapor to separate from the TEG. The condensed water removed by dehydration is discharged, however because the process of separating the water from the TEG is essentially a distillation process, unless there is an upset situation, there will not be any significant concentration of TEG in the discharged water. The discharged water from this process is essentially distilled water with small amounts of TEG.
Di-ethylene glycol (DEG) is sometimes used for dehydration for uniformity when hydrate inhibition is required upstream of dehydration.
Tetra-ethylene glycol (TREG) is more viscous and more expensive than the other glycols. The only real advantage is its lower vapor pressure which reduces absorber vapor loss. It should only be considered for rare cases where glycol dehydration will be employed on a gas whose temperature exceeds about 50 °C, such as when extreme ambient conditions prevent cooling to a lower temperature.
The design of Dehydration Systems is unique for every requirement and the overall package design will vary to meet the specified moisture content of the gas at the process conditions. Each system is typically designed and built as a complete turn-key package with particular emphasis and NoDoC cost estimation models consider the following issues for estimation:
• Discharge gas moisture content
• High gas dehydration capacity
• Minimum glycol losses
• Minimum power consumption
• Optimum plant efficiency & design integrity
• Compliance with HSE requirements
• Environmentally conscientious design .
NoDoC provides cost estimation model for three 3 common types of Glycol that is used for Gas Dehydration:
• Mono-Ethylene Glycol (MEG),
• Di-Ethylene Glycol (DEG),
• Tri-Ethylene Glycol (TEG),
• Tetra-ethylene glycol (TREG).
The type of Glycol used and the package design depends on several factors, and the end-users specific requirements and objectives for the gas stream being processed.
Triethylene glycol (TEG) is almost exclusively used for this purpose. TEG absorbs water from the gas. To remove the water from the TEG, the TEG is heated to above the boiling point of water causing the water vapor to separate from the TEG. The condensed water removed by dehydration is discharged, however because the process of separating the water from the TEG is essentially a distillation process, unless there is an upset situation, there will not be any significant concentration of TEG in the discharged water. The discharged water from this process is essentially distilled water with small amounts of TEG.
Di-ethylene glycol (DEG) is sometimes used for dehydration for uniformity when hydrate inhibition is required upstream of dehydration.
Tetra-ethylene glycol (TREG) is more viscous and more expensive than the other glycols. The only real advantage is its lower vapor pressure which reduces absorber vapor loss. It should only be considered for rare cases where glycol dehydration will be employed on a gas whose temperature exceeds about 50 °C, such as when extreme ambient conditions prevent cooling to a lower temperature.
The design of Dehydration Systems is unique for every requirement and the overall package design will vary to meet the specified moisture content of the gas at the process conditions. Each system is typically designed and built as a complete turn-key package with particular emphasis and NoDoC cost estimation models consider the following issues for estimation:
• Discharge gas moisture content
• High gas dehydration capacity
• Minimum glycol losses
• Minimum power consumption
• Optimum plant efficiency & design integrity
• Compliance with HSE requirements
• Environmentally conscientious design .
