In different production stages of shale gas fields, various operating conditions and parameters vary widely, and the operating conditions of the triethylene glycol dehydration unit may deviate from the optimal range, which may easily lead to insignificant dehydration effects, which will affect normal production. The HYSYS software was used to simulate the process of a 300.0×104 Nm3/d shale gas triethylene glycol dehydration unit.The influence of the process parameters on the dehydration effect of the triethylene glycol such as the triethylene glycol circulation volume, the mass fraction of the triethylene glycol lean liquid, the flow rate of the feed gas into the tower, and the temperature of the feed gas into the tower,the operating pressure of the absorption tower, the temperature of the lean triethylene glycol liquid entering the tower, the total efficiency of the trays and the number of trays in the absorption tower were quantitatively analyzed.And the reasonable operating range of each process parameter was determined to achieve the best dehydration effect and meet the requirements of dry gas export. The results show that increasing the triethylene glycol circulation, lean liquid mass fraction, absorption tower operating pressure, total tray efficiency and number of absorption trays, as well as reducing the flow and temperature of feed gas into the tower, and the temperature of triethylene glycol lean liquid entering the tower are all helpful to improve the dehydration effect of triethylene glycol; increasing the temperature of the reboiler and the flow of stripping gas are beneficial to increase the mass fraction of the lean triethylene glycol. In addition, the HYSYS simulation calculation results are compared with the on?site production data. The results show that the two are basically consistent, which verifies the accuracy of the simulation calculation results, which can be used to guide actual production. The above research has certain guiding significance for improving dehydration efficiency and reducing investment cost.
