A gas dehydration system removes water from natural gas. When gas comes to the surface, even after the initial separation it still contains some element of entrained water. Gas saturated with water—often referred to as “wet gas”—can cause a variety of problems for midstream transport and downstream gas production processes.
In a gas dehydration system, an element called Triethylene glycol—"TEG" or just "glycol" for short—is introduced into the wet gas and absorbs the water out of the gas.
After this, the glycol is saturated with water and the water must be removed for the glycol to be used again. Most of the equipment in a gas dehydration system is designed to separate the water from the glycol. It achieves this by heating the water saturated glycol in order to boil the water into vapor and “dry out” the glycol to at least 97% purity.
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