Natural gas well streams carry water vapor, this water vapor must be removed. The process for removing water vapor from the gas stream is referred to as Dehydration.
Gas Dehydrators are composed of two units which work together, a Gas Fired Regenerator and a Glycol Contact Tower.
Gas Dehydrator Regenerator: The regenerator section is designed to heat and boil off the water. Glycol coming from the Glycol Contact Tower combines with the water in the gas stream and enters the regenerator, the water steams off and is removed from the glycol. The glycol is not affected by temperatures under 425 degrees. The now “lean” glycol enters back into the tower and the process is repeated.
Glycol Contact Tower: The gas stream enters in the lower section of the Glycol Contact Tower and starts a vertical flow towards the gas outlet located center top of the tower. This wet gas stream encounters the glycol which entered the top section of the contact tower. The Glycol downward flow and the Gas upward flow are interrupted by Bubble Cap Trays or Structured Packing in the tower, which allow for further Glycol/Gas contact, which allows the glycol to draw out the water from the gas stream. This “wet” or “saturated” glycol enters into the regenerator where the water is steamed off and removed.
The Regenerator and Glycol Contact tower are connected by piping with a Glycol Pump incorporated which circulates the Glycol from the Regenerator to the Contact Tower in a continuous uninterrupted cycle. The Gas Stream never enters the Regenerator.
Reboiler sizes: 125,000 BTU Hr., 200,000 BTU Hr., 375,000 BTU Hr., 500,000 BTU Hr., 750,000 BTU Hr. 1,000,000 BTU Hr., 1,500,000 BTU Hr.
Glycol Contact Towers are typically 1440 w.p.
Glycol Contact Towers range in size from, 8”O.D. x 17’ Length to 72” O.D. x 30’ Length.
Glycol Contact Towers may have internal “Bubble Cap Trays” or “Structured Packing” upon customer request.