Processs oF TEG dehydration in natural gas is a normal way to remove water in natural gas. The saturated wet natural gas is separated from 5 μm droplets and above through the filter separator and then enter the gas-liquid separation chamber at the lower part of the triethylene glycol absorption tower of the dehydration unit to separate the free liquid that may be brought into the absorption tower when the filter separator is in an accident state. It enters the absorption section through the riser of the absorption tower. The regenerated triethylene glycol is injected into the top of the absorber to fully contact with the bottom-up natural gas on the absorber for mass transfer and exchange to remove water. The moisture removed natural gas is removed by the tower top mist catcher for more than 5 μm glycol drops out of the tower. After leaving the tower, it exchanges heat with the hot lean glycol before entering the tower through the casing heat exchanger to reduce the temperature of triethylene glycol entering the tower. The natural gas after heat exchange enters the filter separator to separate the carried glycol and then enters the export pipeline. The triethylene glycol rich that absorbs the water in the natural gas flows out of the absorption tower and enters the liquid level regulating valve. After depressurization, it enters the reflux cooling plate on the top of the rich liquid distillation column, exchanges heat with the hot steam generated in the reboiler, provides the reflux cooling capacity on the top of the column, is heated to about 50 ℃, and the outlet pipe enters the triethylene glycol flash tank. The rich glycol is depressurized to 0.4MPa ~ 0.6MPa in the flash tank, and the hydrocarbon gas and other gases dissolved in triethylene glycol are flashed out, which is used as the fuel gas for the combustion of reboiler. The flash rich liquid triethylene glycol enters the mechanical filter to filter out mechanical impurities, and then enters the activated carbon filter to further adsorb the hydrocarbons dissolved in triethylene glycol and the degradation substances of triethylene glycol. Then it enters the plate rich and poor liquid heat exchanger to exchange heat with the high-temperature lean triethylene glycol from the heat exchange buffer tank at the lower part of the triethylene glycol reboiler. The heat exchange rises to 120 ~ 130 ℃ and enters the rich liquid distillation column. In the triethylene glycol reboiler at the lower part of the distillation column, triethylene glycol is heated to 193 ℃, and the water in triethylene glycol is fractionated and discharged from the top of the distillation column through the fractionation of the distillation column. Lean glycol with a concentration of about 99% (WT) overflows from the lean liquid stripping column in the reboiler to the lower triethylene glycol heat exchange buffer tank. 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. Lean triethylene glycol is pumped into the gas-liquid heat exchanger outside the absorber by pump, cooled with the outlet gas heat exchanger, and then enters the top of the absorber from the upper part of the casing to complete the solvent circulation. A stream of dry gas is led out from the dry gas pipe section at the outlet of the absorber and enters the dry gas heating pipe of the heat exchange buffer tank at the lower part of the triethylene glycol reboiler. After being heated by lean triethylene glycol, it is throttled to 0.4MPa through the self operated pressure regulating valve and enters the fuel gas buffer tank. After leaving the fuel gas buffer tank, it is divided into two ways. One way is heated and enters the lower part of lean liquid stripping column as lean liquid stripping gas; The other is the fuel gas used as the reboiler.