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Simulation on vapor-liquid equilibrium of CO₂-[emim][Tf₂N] in flow state and depressurization of its refrigeration cycle based on Aspen Plus.

Author(s) : LI K., WU W., WU J., ZHANG H.

Type of article: IJR article

Summary

To investigate the depressurization mechanism of the CO₂ vapor compression refrigeration cycle with an ionic liquid loop, a vapor-liquid equilibrium (VLE) model of CO₂-[emim][Tf₂N] in the flow state was established based on Aspen Plus, and the prediction of VLE in the supercritical state was carried out. Furthermore, the effects of CO₂ inlet pressure, absorber temperature, CO₂ inlet mole fraction and CO₂ inlet flow rate on the depressurization amplitude of absorber were analyzed through the absorption-desorption process simulation. The results showed that with the increase of CO₂ inlet pressure in the supercritical state, the depressurization amplitude increased but its growth rate slowed down, which indicated that the effect of pressure as a driving term of mass transfer decreased in the supercritical state. The depressurization amplitude decreased with the increase of absorber temperature, and decreased rapidly with the increase of CO₂ inlet mole fraction. In this sense, adding an auxiliary desorber at the absorber inlet is beneficial to the system depressurization. Due to the limited absorption capacity of quantitative [emim][Tf₂N] in the absorber, with the continuous increase of CO₂ inlet flow rate, the depressurization amplitude first dropped sharply, then flattened, and later dropped rapidly. Because the CO₂ flow rate in an actual system is proportional to the system cooling capacity, the proper mass flow ratio of CO₂-[emim][Tf₂N] should be selected to reconcile the cooling capacity and depressurization amplitude.

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Pages: 75-84

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Details

Original title: Simulation on vapor-liquid equilibrium of CO₂-[emim][Tf₂N] in flow state and depressurization of its refrigeration cycle based on Aspen Plus.
Record ID : 30028184
Languages: English
Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 124
Publication date: 2021/04
DOI: http://dx.doi.org/10.1016/j.ijrefrig.2020.12.018

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Indexing

Themes: CO2;
Compression systems;
Absorption and adsorption systems
Keywords: CO2; Vapour; Liquid; Equilibrium; Pressure drop; Flow; Cycle; Model; Expérimentation; Ionic liquid; R744