System functions and design parameters of TEG dehydration description

1) System functions

The lean triethylene glycol from the regeneration system is first cooled by the lean-rich liquid heat exchanger and then pressurized by the TEG circulation pump. Then, after cooling with the natural gas at the outlet of the absorber, it enters the absorber and flows downward. The raw gas separated by the separator outside the absorber and the scrubber inside the tower enters the bottom of the absorber and flows upward. When the two are in countercurrent contact with the filler, the water vapor in the gas is absorbed by the triethylene glycol solution. A defoamer is provided at the top of the absorber to remove the glycol droplets carried by the outlet dry gas, thereby reducing glycol loss. The rich glycol that has absorbed the water vapor in the gas leaves the bottom of the absorber, and after being heated by the reflux condenser coil of the regeneration tower rectification column and the lean-rich liquid heat exchanger, most of the dissolved gas in the rich glycol is separated in the flash tank, and then enters the regeneration tower through the mechanical filter, activated carbon filter and lean-rich liquid heat exchanger. The absorbed water is heated in the reboiler at near normal pressure and evaporated, and then discharged to the atmosphere from the top of the rectification column. The regenerated lean glycol is recycled through the buffer tank, lean-rich liquid heat exchanger, TEG circulation pump and glycol heat exchanger. The device adopts the mature triethylene glycol (TEG) dehydration process to ensure long-term stable and reliable operation of the device.

2) Design parameters

Raw gas processing capacity of TEG dehydration plant: 85MMSCFD

Absorption tower absorption pressure 6.0MPa g

Adsorption temperature: 54℃

Regeneration pressure: 0.01MPa g

Regeneration temperature: ~19 5 ℃

Regenerative heat source: induced burner

H2O content in purified gas <-10℃ (dew point)

TEG circulation: ~4 m³/h

Lean TEG concentration (mol%): 96.8%

3) Scope of application

The load adjustment range of raw gas is 20 ~110 % .

4) Process description

The lean triethylene glycol from the regeneration system is first cooled to 75°C by the lean-rich liquid heat exchanger (E1303), then pressurized to 6.0MPa by the TEG circulation pump, and then enters the absorption tower after cooling with the natural gas at the outlet of the absorption tower and flows from top to bottom. The raw gas separated by the separator outside the absorption tower and the scrubber inside the tower enters the bottom of the absorption tower and flows upward. When the two are in countercurrent contact with the packing, the water vapor in the gas is absorbed by the triethylene glycol solution. A defoamer is provided at the top of the absorption tower to remove the glycol droplets carried by the outlet dry gas, thereby reducing glycol loss. The rich glycol that has absorbed water vapor in the gas leaves the bottom of the absorption tower, and after being heated by the reflux condenser coil of the regeneration tower distillation column and the lean-rich liquid heat exchanger, most of the dissolved gas in the rich glycol is separated in the flash tank, and then enters the regeneration tower through a mechanical filter, an activated carbon filter and a lean-rich liquid heat exchanger, and is heated in the reboiler at near normal pressure to evaporate the absorbed water, and is discharged into the atmosphere from the top of the distillation column. The regenerated lean glycol is recycled through a buffer tank, a lean-rich liquid heat exchanger, a TEG circulation pump and a glycol heat exchanger.

Contact:

Sichuan Rongteng Automation Equipment Co., Ltd.

Phone/WhatsApp/Wechat : +86 177 8117 4421

Website: www.rtgastreat.com     Email: info@rtgastreat.com

Address:No. 8, Section 2 of Tengfei Road, Shigao Subdistrict,Tianfu New Area, Meishan city, Sichuan China 620564