TEG regenration in Natural gas Dehydration process: TEG regenration in natural gas dehydration process
Author
Suborna, Rani Nath
Term
2. term
Education
Publication year
2021
Submitted on
2021-05-31
Pages
53
Abstract
Naturgas indeholder ofte vanddamp under produktion. For at forhindre gashydrater (islignende propper) og opfylde salgsgasspecifikationer skal vandet fjernes via dehydrering. En udbredt og omkostningseffektiv metode er glykoldehydrering, som bruger triethylenglykol (TEG) til at optage vand. Dette studie anvender proces-simuleringssoftwaren Aspen HYSYS til at modellere et TEG-dehydreringssystem og udføre en følsomhedsanalyse for at udforske og eventuelt optimere centrale driftsbetingelser. I simuleringerne blev tre TEG-cirkulationsrater, strippegas-flow og genkogerens (reboiler) temperatur varieret. Modellen reducerede vandindholdet fra 13,80 til 0,623 lb/MMSCF. Analysen peger på driftsforhold, der giver effektiv vandfjernelse, og estimerer TEG-renhed ved en TEG-strøm på 3750 kg/t, en genkogertemperatur på 204°C og et strippegas-flow på 1900 kg/t. Samlet set tyder resultaterne på, at brug af strippegas er en effektiv måde at forbedre TEG-renhed og dehydreringens samlede ydeevne.
Natural gas often contains water vapor during production. To prevent gas hydrates (ice-like blockages) and meet sales-gas specifications, this water must be removed through dehydration. A common and cost-effective method is glycol dehydration, which uses triethylene glycol (TEG) to absorb water. This study uses Aspen HYSYS process-simulation software to model a TEG dehydration system and perform a sensitivity analysis to explore and potentially optimize key operating conditions. The simulations varied three TEG circulation rates, the stripping-gas flow rate, and the reboiler temperature. The model reduced water content from 13.80 to 0.623 lb/MMSCF. The analysis identifies operating conditions that provide strong water removal and estimates TEG purity at a TEG flow of 3750 kg/h, a reboiler temperature of 204°C, and a stripping-gas flow of 1900 kg/h. Overall, using stripping gas appears to be an effective way to improve TEG purity and the performance of the dehydration plant.
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