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carollo c simulation natural gas teg dehydration plant 2018

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Textbook in PDF format Natural gas is saturated with water at reservoir conditions. For this reason it is necessary to remove it to avoid operational problems, such as corrosion, hydrate formation or slug flow, during the transportation or processing of natural gas. This is usually obtained by dehydration, which is a process thanks to which water is removed from the gas to prevent its condensation under high pressure or low temperature conditions. Typically, in offshore units, dehydration by some glycol desiccant, usually triethylene glycol (TEG), occurs. Although it is a generally used procedure in industrial practice, several parameters affect its efficiency, such as the glycol circulation rate, the operating conditions of the columns, the way by which the purity of the glycol is enhanced during regeneration etc. In particular, since it is not possible to work close to TEG boiling point, the lean TEG purity required by the absorption process is obtained in the regeneration section with enhanced methods, as the addition of stripping gas or setting vacuum conditions in the distillation column. For this reason, in this work, a sensitivity analysis of several operating variables of the process has been conducted. Namely, the effect of the temperature and pressure of the glycol contactor and regenerator, the temperature obtained after the heat exchangers and the stripping gas rate. This has been achieved by simulating a typical dehydration unit, based on conditions taken from the literature, in the Aspen HYSYS vs 8.8. environment. For the simulation two different thermodynamic models have been considered. That is the proposed by HYSYS for the use in dehydration TST-NRTL model and the UMR-PRU model which has been developed in the thermodynamics and transport phenomena laboratory and is known to yield satisfactory results for natural gas mixtures and it is implemented into HYSYS through the CAPE-OPEN 1.1 protocol. Overall, it is concluded that the UMR-PRU model yields better results than the proposed by HYSYS TST-NRTL model in the simulation of a TEG dehydration unit

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Carollo C. Simulation of a natural gas TEG dehydration plant 2018.pdf 9.2 MB

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carollo c simulation natural gas teg dehydration plant 2018