TY - JOUR

T1 - Finite-time thermodynamics

T2 - Multistage separation processes consuming mechanical energy

AU - Sukin, Ivan

AU - Tsirlin, Anatoly

AU - Andresen, Bjarne Bøgeskov

PY - 2022

Y1 - 2022

N2 - We analyze limiting capabilities of mechanical separation processes using finite-time thermodynamics and obtain estimates for the lower bound of the energy consumption for systems of a given productivity. We show that this consumption does not tend to zero when the molar fraction of one of the components tends to unity. The estimates obtained are used to analyze multistage separation processes, containing recycles, especially, isotope separation systems. For such systems we obtain relations between fluxes, mass transfer surfaces, and stage number. These relations are deduced from the condition of minimum dissipation, assuming that the enrichment factor is constant. We also obtain the optimality condition for the sequence of separations needed for a multicomponent mixture in a mechanical separation systems.

AB - We analyze limiting capabilities of mechanical separation processes using finite-time thermodynamics and obtain estimates for the lower bound of the energy consumption for systems of a given productivity. We show that this consumption does not tend to zero when the molar fraction of one of the components tends to unity. The estimates obtained are used to analyze multistage separation processes, containing recycles, especially, isotope separation systems. For such systems we obtain relations between fluxes, mass transfer surfaces, and stage number. These relations are deduced from the condition of minimum dissipation, assuming that the enrichment factor is constant. We also obtain the optimality condition for the sequence of separations needed for a multicomponent mixture in a mechanical separation systems.

U2 - 10.1016/j.ces.2021.117250

DO - 10.1016/j.ces.2021.117250

M3 - Journal article

VL - 248

JO - Chemical Engineering Science

JF - Chemical Engineering Science

SN - 0009-2509

IS - Part B

M1 - 117250

ER -