Use of a New Gas Ejector for a TEG/TREG Natural Gas Dehydration System

Marcin Bernat (), Stanisław Nagy () and Rafał Smulski
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Marcin Bernat: Górnicze Biuro Projektów Pangaz Sp. z o.o., ul. Bratysławska 2/7, 31-201 Kraków, Poland
Stanisław Nagy: Department of Gas Engineering, Faculty of Drilling, Oil and Gas, AGH University of Krakow, al. Mickiewicza 30, 30-059 Kraków, Poland
Rafał Smulski: Department of Gas Engineering, Faculty of Drilling, Oil and Gas, AGH University of Krakow, al. Mickiewicza 30, 30-059 Kraków, Poland

Energies, 2023, vol. 16, issue 13, 1-19

Abstract: Glycol dehydration is the most common and economical water removal method from natural gas streams. However, dehydration of low-pressure natural gas requires the use of higher concentration TEG (Triethylene Glycol) or TREG (Tetraethylene Glycol). This article describes how the ejector can be used to create a vacuum in the glycol reboiler to achieve a higher concentration of L-TEG/L-TREG (Lean Triethylene Glycol/Lean Tetraethylene Glycol). Process simulations of the gas dehydration and glycol regeneration units were carried out in Chemcad software. Simulations were performed for decreasing values of gas working pressure and TEG/TREG regeneration pressures. Dehydration unit efficiency was tested for two values of glycol flow rates. Ejector performance simulations were executed for two positions in the process flow line. The influence of pressure reduction in the glycol reboiler on the concentration of L-TEG/L-TREG and the water dewpoint of natural gas has to be found significant. The increase in glycol flow rate has a greater impact on TREG than for TEG. Creating a vacuum with an ejector in a TEG/TREG reboiler has been shown to be an attractive way to improve the efficiency of natural gas dehydration. The position of the ejector at the end of the vapor flow line, downstream to the condensed water separator, allows for a significant reduction in motive gas consumption.

Keywords: ejector; vacuum; gas dehydration; TEG/TREG regeneration; dewpoint (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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