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Category: Design Considerations

Design Considerations

Stripping Still Temperature

Posted on September 21, 2009

A higher temperature in the top of the still column can increase glycol losses due to excessive vaporization. The boiling point of water is 212°F…

Design Considerations

Glycol Circulation Rate

Posted on September 21, 2009

When the number of absorber trays and lean glycol concentration are fixed, the dew-point depression of a saturated gas is a function of the glycol…

Design Considerations

Stripping Gas

Posted on September 21, 2009

The lean glycol concentration leaving the reboiler can be lowered by contacting the glycol with stripping gas. Often, wet gas that is saturated with water…

Design Considerations

Reboiler Pressure

Posted on September 21, 2009

Pressures above atmospheric in the reboiler can significantly reduce lean glycol concentration and dehydration efficiency. The still column should be adequately vented and the packing…

Design Considerations

Glycol Reboiler Temperature

Posted on September 21, 2009

The reboiler temperature controls the concentration of the water in the lean glycol. The higher the temperature the higher the concentration, as shown in Figure…

Design Considerations

Glycol Concentration

Posted on September 20, 2009

The higher the concentration of the lean glycol the greater the dewpoint depression for a given glycol circulation rate and number of trays. Figure 8-9…

Design Considerations

Lean Glycol Temperatures

Posted on September 20, 2009

The temperature of the lean glycol entering the contactor has an effect on the gas dew-point depression and should be held low to minimize required…

Design Considerations

Number of Contactor Trays

Posted on September 20, 2009

The glycol and the gas do not reach equilibrium on each tray. A tray efficiency of 25% is commonly used for design. That is, if…

Design Considerations

Contactor Pressure

Posted on September 20, 2009

Contactor pressures have little effect on the glycol absorption process as long as the pressures remain below 3,000 psig. At a constant temperature the water…

Design Considerations

Inlet Gas Temperature

Posted on September 20, 2009

At constant pressure, the water content of the inlet gas increases as the inlet gas temperature increases. For example, at 1,000 psia and 80°F gas…

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