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Characterisation of Vibration Causing a Two-phase Flow in CO2-removal Process

Abstract: Activated-methyldiethanolamine (a-MDEA)-based CO2 removal is a well-established process for deep removal of CO2 from synthesis gas preparation for ammonia synthesis. The process utilises a two-step regeneration of solvent via depressurisation and heating. During depressurisation step, CO2 is released from amine solvent forms a separate vapour phase thus leading to a two-phase flow. The pressure drop in piping network and thermo-kinetic of desorption are highly interlinked phenomena. Accurate estimation of the pressure profile is therefore essential for designing piping network. A methodology has been described in this paper which takes into consideration simultaneous solution of mass, energy and momentum balance equations coupled with thermo-kinetic interaction of CO2 and a-MDEA solvent. This has been applied to two industrial cases to find flow pattern and location in piping network and verified with commercial software available. In one case, a segment of piping network was found in the slug flow and in other case fluid velocity is exceeding the erosion velocity.