The key point of glycol dehydration principles as following dehydration process and glycol process, absorption process, distillation, heat transfer pr

The key point of Glycol Dehydration as following:

2. Dehydration
The process of removing water from a substance is called dehydration. Although there are several methods for removing water from gas, the most commonly used dehydration method utilizes a substance known as Triethylene Glycol (T.E.G.) or simply glycol.3. Glycol
Triethylene Glycol, T.E.G., and glycol all refer to the same substance. T.E.G. is expensive so it is efficient to remove the water, recycling the T.E.G. to be used over and over again.4. Absorption

5. Distillation
In distillation, water is separated and removed from glycol by boiling T. Glycol does not begin to boil until approximately 435° F. Water boils at 212° F. Distillation of water from glycol involves heating the glycol water mixture to a temperature between 212° F. and 400° F., allowing water to separate as vapor.6. Heat Transfer
Conduction is the process by which heat travels through a substance. If two containers of water one containing cold water, the other hot water are brought into contact with each other, the temperature of the hot water container will decrease and the temperature of the cold water container will increase. The temperature changes result because of heat transfer from hot to cold.
7. Basic Process

Glycol Dehydration Process Flow



1. Inlet Separator
The process begins when unprocessed natural gas enters a device called a separator or scrubber. In this separator free water is removed from the gas, leaving gas with water vapor to flow into the contactor column.2. Contactor Column
In this vertical pressure vessel, water is removed from gas. Inside the contactor column are several trays covered with glycol. Each tray has a number of evenly arranged openings, covered with bubble caps.





Dry glycol enters the contactor tower at an inlet near the top and flows across the top tray, then downward and across other trays. A level of glycol is maintained on a tray by means of a dam known as a weir. This level is above the slots in the bubble caps so the gas is forced to bubble through the glycol.
The glycol flows over the weir through an opening known as a downcomer and into the tray below. Maintaining the level of glycol on the next tray above the bottom of the downcomer prevents gas from bypassing the bubble cups. As the glycol spills downward through each succeeding tray, it becomes saturated with the water it has absorbed from the gas and collects in the bottom of the contactor. The wet glycol from the contactor then passes through a filter where any abrasive particles and tarry hydrocarbons are removed before entering the pump.
3. Surge Tank


4. Gas-Condensate-Glycol Separator


5. Reboiler and Still Column






From the surge tank, the dry glycol flows to a pump. The pump raises the pressure of the dry glycol slightly above that of the contactor column. This dry glycol then passes through a heat exchanger which cools the glycol to near the temperature of the natural gas in the contactor. Proper temperature and pressure must be maintained in this system to prevent foaming. With the return of the glycol to the contactor column, the dehydration cycle is completed and another cycle begins.
- [accordion]
- 1. Glycol Dehydration Systems Intro
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- 2. Gas Dehydration System: Glycol Regeneration
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- 3. API Spec 12GDU-1990 Type Gas Dehydration Units - Glycol Spec
- 4. API 674 2010 2016 Reciprocating - Positive Displacement Pumps
- 5. API 674 Pump Data Sheet
- 6. D1142 952012 Standard Test Method Water Vapor Content of Gas
- 7. PLP P-2-2003 Glycol Dehydration-2nd Ed-Rosen
- 8. PLP P-3-2003 Contactor in Dehydration Plant-1st Ed-Rosen
- 9. PLP P-4-2003 Stripper in Dehydration Plant-2nd Ed-Rosen
- 10. PLP P-6-2003 Molecular Sieve Adsorbers-3rd Ed-Rosen
- 11. PLP P5 2003 Molecular Sieve Dehydration
- 1. Glycol Dehydration Systems Intro
- 2. Gas Dehydration System: Glycol Regeneration
- 3. API Spec 12GDU-1990 Type Gas Dehydration Units - Glycol Spec
- 4. API 674 2010 2016 Reciprocating - Positive Displacement Pumps
- 5. API 674 Pump Data Sheet
- 6. D1142 952012 Standard Test Method Water Vapor Content of Gas
- 7. PLP P-2-2003 Glycol Dehydration-2nd Ed-Rosen
- 8. PLP P-3-2003 Contactor in Dehydration Plant-1st Ed-Rosen
- 9. PLP P-4-2003 Stripper in Dehydration Plant-2nd Ed-Rosen
- 10. PLP P-6-2003 Molecular Sieve Adsorbers-3rd Ed-Rosen
- 11. PLP P5 2003 Molecular Sieve Dehydration