چكيده به لاتين
This study evaluates Small-Scale Liquefied Natural Gas (SSLNG) processes. Among existing liquefaction processes, three were chosen and thermodynamic evaluations including energy, exergy, advanced exergy and economic assessments compromising exergoeconomics and advanced exergoeconomics were implemented on them; Dual expander, Pre-cooled PRICO and Nitrogen Expansion were the selected processes. Exergy destruction of each component was calculated in four categories: Avoidable, Unavoidable, Endogenous and Exogenous exergy destructions. In exergoeconomic analysis, through combining economic concepts and exergetic evaluations, an exergy cost rate parameter is assigned to each stream and balance equations were applied on to each component of the system. Generally the number of unknown costs is more than the number of equations and to solve this Fuel (F) and Product (P) rules from SPECO perspective were utilized. In advanced exergoeconomic analysis functional and economic performance of the components are investigated in a more comprehensive scale and their interactions with other components are also take into account, through which exergy destruction costs and investment costs are divided into four categories similar to advanced exergy analysis. Considering technical and economical specifications, dual expender process was understood to be more suitable than others for liquefaction of natural gas in small-scale.
