Gas Dehydration – how it works & key benefits

How it works:
A TEG dehydration unit combined glycol regeneration and natural gas drying phases. First, water vapor-mixed natural gas is directed via a feed gas entrance on the gas scrubber to remove any free water present. This gets rid of free hydrocarbons, particle contaminants, and the majority of the water that is suspended in the gas stream. However, more drying is required because the natural gas is still regarded as “wet” at this point.

The last step involves sending the gas through connecting channels to a contact tower, where the drying process is completed. In a typical contact tower, liquid glycol that is moisture-free or “lean” is contained in properly constructed levels. Typically, natural gas is delivered from an inlet at the base of the contact tower, rising through it, and coming into continual touch with the glycol fluid at various heights. As the gas rises to the top of the column, any moisture that may still be present in it is drawn out, and a channel is waiting to transport the freshly dried gas to storage tanks or further processing. While this is going on, the contact tower’s glycol solution absorbs moisture and becomes “rich,” requiring regeneration. Wet glycol is removed through another outlet and directed to a regeneration process, while dry glycol is fed into the process through one inlet.

When “wet” glycol is directed into a three-stage flash separator to remove accumulated water vapour, particle contaminants, and oils, the process of reformulating lean glycol begins. Impurity-free glycol is transferred to a reboiler unit while the impurities are directed to storage tanks for later disposal.