After flashing, the rich liquid triethylene glycol enters the mechanical filter to filter out the mechanical impurities, and then goes into the activated carbon filter to further absorb the hydrocarbon substances dissolved in triethylene glycol and the degradation substances of triethylene glycol. Then it enters the plate type rich and poor liquid heat exchanger to exchange heat with the high temperature lean triethylene glycol from the lower heat exchange buffer tank of the triethylene glycol reboiler. The heat exchange temperature rises to 120 ~ 130 ℃ and enters the rich liquid distillation column.
In the triethylene glycol reboiler at the bottom of the distillation column, triethylene glycol is heated to 193 ℃, and the water in the triethylene glycol is fractionated and discharged from the top of the distillation column. The concentration of about 99% (WT) of lean glycol is overflowed into the lower triethylene glycol heat exchange buffer tank by the lean liquid stripping column in the reboiler. Under the action of dry gas in the lean liquid stripping column, the concentration of lean glycol entering the heat exchange buffer tank can reach 99.5% ~ 99.8%.
In the glycol buffer tank, the lean glycol with a temperature of about 193 ℃ enters the rich and poor glycol heat exchanger to exchange heat with the rich glycol. When the temperature drops to about 100 ℃, it enters the pump. The lean liquid triethylene glycol is pumped into the external gas-liquid heat exchanger of the absorption tower by pump. After cooling with the gas heat exchanger out of the tower, it enters the top of the absorption tower from the upper part of the casing pipe to complete the solvent circulation.
A stream of dry gas is led out from the dry gas section at the outlet of absorption tower, and enters the dry gas heating pipe of heat exchange buffer tank at the lower part of triethylene glycol reboiler. After being heated by lean triethylene glycol, it is throttled to 0.4MPa by self operated pressure regulating valve and then enters into fuel gas buffer tank.
The main equipment of triethylene glycol dehydration unit (TEG dehydration unit) are:
- 1 set of feed gas filter separator
- 1 set of triethylene glycol absorption tower
- 1 set of gas–lean TEG heat exchanger
- 2 sets of triethylene glycol rich liquid mechanical filter
- 1 set of TEG rich liquid activated carbon filter
- 2 set of TEG circulating pumps
- 1 set of TEG rich liquid flash tank
- 1 set of fuel gas buffer tank
- 1 set of rich and poor–liquid glycol heat exchanger
- 1 set of TEG regeneration tower combination equipment
- 1 off gas burning furnace
- 1 TEG storage tank
Through this process flow of TEG absorption dehydration, the purity of triethylene glycol regeneration exceeds 99%, and it can be repeatedly recycled for 18-24 months, with very high economic benefits. It is suitable for processing natural gas with large volumes and low requirements for water dew point in the gathering and transportation process.
Contact:
Sichuan Rongteng Automation Equipment Co., Ltd.
Phone/WhatsApp/Wechat : +86 177 8117 4421 +86 138 8076 0589
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
Post time: Dec-21-2023
