“…For a stable system, the exergy is composed of physical exergy and chemical exergy. The physical exergy and chemical exergy are determined by eqs and where 0 refers to the dead state , of the system ( T 0 = 298.15 K, P 0 = 101.325 kPa), x i is the molar fraction of component i , and ex i ch,0 is the standard chemical exergy.…”
Section: Methodsmentioning
confidence: 99%
“…where 0 refers to the dead state 40,41 of the system (T 0 = 298.15 K, P 0 = 101.325 kPa), x i is the molar fraction of component i, and ex i ch,0 is the standard chemical exergy. The total exergy, ex, is expressed by eq 8…”
A sustainable reactive coupling pressure-swing
distillation process
is investigated to separate the acetonitrile/isopropanol/water ternary
mixture. To solve the problem of high energy consumption in this process,
the application of heat integration and heat pump technologies on
the basis of the reactive coupling pressure-swing distillation process
are explored to achieve further energy saving. The results showed
that the processes with heat pump have the better potential for energy
reduction. Comparative analysis from the aspects of exergy, energy
consumption, cost, and gas emission are conducted to evaluate the
thermodynamic efficiency and economic and environmental improvement
potential of the proposed processes. The reactive coupling pressure-swing
distillation process in combination with a single heat pump, RPSDL-SHP,
exhibits the best economic performance and 48.51% reduction in the
total annual cost and 70.04% energy saving in comparison with the
conventional process. The total exergy efficiency of RPSDL-SHP is
up to 97.92%, which means that application of heat pump is feasible
to save energy, reduce the cost of the process, and enhance exergy
efficiency.
“…For a stable system, the exergy is composed of physical exergy and chemical exergy. The physical exergy and chemical exergy are determined by eqs and where 0 refers to the dead state , of the system ( T 0 = 298.15 K, P 0 = 101.325 kPa), x i is the molar fraction of component i , and ex i ch,0 is the standard chemical exergy.…”
Section: Methodsmentioning
confidence: 99%
“…where 0 refers to the dead state 40,41 of the system (T 0 = 298.15 K, P 0 = 101.325 kPa), x i is the molar fraction of component i, and ex i ch,0 is the standard chemical exergy. The total exergy, ex, is expressed by eq 8…”
A sustainable reactive coupling pressure-swing
distillation process
is investigated to separate the acetonitrile/isopropanol/water ternary
mixture. To solve the problem of high energy consumption in this process,
the application of heat integration and heat pump technologies on
the basis of the reactive coupling pressure-swing distillation process
are explored to achieve further energy saving. The results showed
that the processes with heat pump have the better potential for energy
reduction. Comparative analysis from the aspects of exergy, energy
consumption, cost, and gas emission are conducted to evaluate the
thermodynamic efficiency and economic and environmental improvement
potential of the proposed processes. The reactive coupling pressure-swing
distillation process in combination with a single heat pump, RPSDL-SHP,
exhibits the best economic performance and 48.51% reduction in the
total annual cost and 70.04% energy saving in comparison with the
conventional process. The total exergy efficiency of RPSDL-SHP is
up to 97.92%, which means that application of heat pump is feasible
to save energy, reduce the cost of the process, and enhance exergy
efficiency.
“…The former operating mode is suitable for on-site electrical power generation. The gasification mode is suitable for producing transportable combustible gaseous fuels that can be used elsewhere for high-temperature applications (1500–2000 °C [36] ) or in a Fischer-Tropsch process [37] . Fig.…”
“…Feng et al 17 constructed four thermodynamic models on the basis of different evaporating bubble or condensing dew point temperatures of mixed liquid to examine the thermoeconomic comparison of pure and mixed working fluids and the exergy efficiency and homogenization energy cost of the ORC. Yan et al 18 analyzed the Fischer-Tropsch syngas production by using the advanced exergy analysis and optimal schema with dual-pressure ORC system, which is designed for further energy recovery based on the theoretical exergy analysis. Three organic working fluid are used for comparing the energy saving of ORCs.…”
In this study, a basic organic Rankine cycle (ORC) is introduced in an air separation process for waste heat recovery. Conventional and advanced exergy analyses are adopted to investigate the thermodynamic properties of components in the ORC. A comprehensive thermodynamic model is constructed to improve the advanced exergy analysis in the ORC, thereby encompassing real, theoretical, unavoidable, and hybrid cycles. Nine organic working fluids are introduced to investigate the influence on the ORC performance. ( 1) The conventional exergy analysis reveals the following: (a) The expander constantly demonstrates the maximum exergy efficiency except when R227ea is used. (b) The evaporator constantly exhibits the maximum exergy destruction regardless of the working fluid used. (c) The maximum product exergy is obtained when R114 is used. (d) Key components must focus on the condenser and evaporator to improve the ORC performance.(2) The advanced exergy analysis reveals that the expander demonstrates maximum potential for improvement because its endogenous avoidable exergy destruction accounts for approximately 90% of its real exergy destruction for all working fluids. The expander must be improved to achieve the optimal ORC performance. The advanced exergy analysis can distinguish the source of exergy destruction and the magnitude for possible improvement via the proposed thermodynamic model in this study. The comprehensive thermodynamic model can promote the investigation of the advanced exergy analysis in the ORC.Applying conventional and advanced exergy analyses to investigate the thermodynamic performance of a system or its components is highly recommended.
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