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TEG Dehydration Systems

Consisting of an absorber tower and a glycol regenerator working in tandem, gas dehydration units remove water vapor from gas streams to limit pipeline corrosion, hydrate formation, and inefficiencies in downstream operations.

Models

  • Absorber Towers:

    • Packed or Trayed up to 72”ID+, up to 200 MMSCFD Flows

  • Regeneration Systems:

    • Reboiler duty sizes from 0.3 to 3MMBTU/hr
    • Electric or Pneumatic Pumps

  • Companion BTEX Mitigation Packages

Markets & Applications

  • Upstream natural gas processing sites
  • Midstream natural gas transmission

  • Only company that offers both the TEG and BTEX system, fully integrated with each other

    We offer companion products that are fully integrated into our dehydration units to eliminate BTEX emissions such as A-Frame and Forced-Draft condensers and 10 EPA OOOOb certified Enclosed Combustors models guaranteed at 98% DRE. We can also provide an emissions analysis upon request. Cimarron’s advanced knowledge of Gas Dehydration Systems and Combustion/Flaring is unmatched in the industry when comparing to fabricators with only one line of product expertise.

  • Expert Engineering

    Our in-house process and design engineering team has over 100+ combined years of experience in plant, field, and facility level glycol dehydration applications. We use the latest industry accepted and EPA endorsed tools to size our units and provide a BRE Promax output simulation with every proposal guaranteeing your unique process requirements.

  • Advanced Energy Efficiency

    We offer advanced shell and tube heat exchanger designs to reduce Fuel Gas demand by 35% vs standard competitor designs. These exchangers are engineered to ensure optimal performance of the activated carbon filters and offer greater protection against high glycol temperatures at the discharge pump.

  • Advanced Controls

    We offer a full spectrum of controls options from pneumatically powered (electricity free) units to fully automated PLC options with in-house I&E design team.

  • Comprehensive Field Services

    We have a dedicated in-house service team with extensive dehydration commissioning, operating, and troubleshooting experience in most major basins. Rest assured that Cimarron will be available to support the product throughout its life.

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Technical Information

Expand sections below to see more information. If you’d like even more details, be sure to check out full Technical Library below.

  • How It Works

    Absorber Towers

    The absorber tower serves as an initial contact point where natural gas is exposed to a liquid desiccant, typically triethylene glycol (TEG), that absorbs the water vapor from the gas. Cimarron has experience in EG and DEG applications as well. As wet natural gas flows upward through the tower, the descending glycol captures the water, leaving dry gas suitable for transport or further processing. The absorber tower’s design allows for maximum contact between the gas and the glycol, optimizing the separation of water.

    Glycol Regeneration Units

    After flowing through the absorber tower, the now water-saturated glycol flows through the glycol regeneration unit, where it is heated in a reboiler to separate the water from the glycol. The water is vaporized and removed from the system, while the regenerated glycol is cooled and recirculated back to the absorber tower to continue the dehydration cycle. The effluent water vapor exits the still column on the reboiler.

  • Design Parameter Considerations

    • Inlet Gas Temperature: The higher the inlet gas temperature, the higher water content of the inlet gas stream. For example, at 1000psia, 80°F gas will hold 34 lb/MMSCFD water and at 120°F for same pressure gas will hold 104 lb/MMSCFD water. Affects tower size and gas-glycol exchanger size.
    • Contactor Pressure: Water content decreases as tower pressure increases for a given temperature. Typically dehydration pressures are between 600 and 1200 psig.
    • Number of Trays (trayed tower): The more trays, the greater dew point depression. This affects glycol circulation rate which affects heat duty on reboiler. Therefore theoretically increases trays should reduce heat duty and therefore size on the reboiler unit (regenerator).
    • Lean Glycol Temperatures: As lean glycol temperature entering the tower increases, glycol losses increase.
    • Glycol Concentration: The higher the concentration of the lean glycol the greater dewpoint depression for a given circulation rate and number of trays. Therefore the higher the concentration of the lean glycol, less duty required and there fore a smaller reboiler unit.
    • Glycol Reboiler Temperature: The higher the temperature in the reboiler, the higher purity of the glycol. Raising reboiler temperature increases heat duty and therefore increases fuel demand. TEG begins to degrade at temperatures > 400°F thereby setting a maximum.
    • Reboiler Pressure: Generally kept at atmospheric. As pressure increases the, reboiler’s ability to boil off glycol is drastically reduced.
    • Stripping Gas: Stripping gas increases glycol purity. Requires additional fuel gas, but normally less than that required to heat the reboiler for the same effect.
    • Glycol Circulation Rate: Generally as circulation rate increases, dew-point depression increases and therefore dehy performance increases. Circulation rate is normally 2 to 7 gal per lb water removed. A minimum circulation is needed to assure good glycol-gas contact. As 7 gal per lb water removed is exceeded the duty on the reboiler goes up. The heat required by the reboiler is directly proportional to glycol circulation rate.

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