The process flow of TEG dehydration unit is typically used for sulfur free natural gas at wellhead or purified gas from alcohol amine desulfurization unit. The TEG dehydration unit mainly consists of two parts: the absorption system and the regeneration system. The core equipment of the process is the absorption tower. The natural gas dehydration process is completed in the absorption tower, and the regeneration tower completes the regeneration operation of the rich solution of triethylene glycol. Generally, when the mass concentration of triethylene glycol in the lean solution is required to be greater than 99%, a stream of dry gas can be introduced into countercurrent contact with the liquid flowing out of the reboiler to further improve the quality of glycerol regeneration and dehydration effect.

The raw natural gas enters from the bottom of the absorption tower and comes into countercurrent contact with the lean solution of triethylene glycol entering from the top. The dehydrated natural gas leaves from the top of the absorption tower, and the rich solution of triethylene glycol is discharged from the bottom of the tower. After being heated by the exhaust pipe of the condenser at the top of the regeneration tower, it enters the flash evaporation tank to flash out the dissolved hydrocarbon gases as much as possible. The liquid phase leaving the flash evaporation tank is filtered by a filter and flows into the lean/rich solution heat exchanger and buffer tank. After further heating, it enters the regeneration tower. In the regeneration tower, the water in the rich solution of triethylene glycol is removed by heating at low pressure and high temperature. After regeneration, the lean solution of triethylene glycol is cooled by the lean/rich solution heat exchanger and pumped into the top of the absorption tower by the glycol pump for circulation.