首页|Exergoeconomic assessment of air separation units for pressurized O-2 production incorporating two-phase expanders
Exergoeconomic assessment of air separation units for pressurized O-2 production incorporating two-phase expanders
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NSTL
Elsevier
Cryogenic air separation units (ASU) are the predominant method for delivering high-purity pressurized O2 at large capacities to relevant industrial processes。 This study presents an exergoeconomic assessment of the integration of two-phase expanders (TPE) in two ASU configurations with (1) intermediate liquid oxygen pumping followed by gaseous O2 compression and (2) total liquid oxygen pumping to the delivery pressure。 A comprehensive exergy analysis showed that TPE integration in the latter resulted in exergy efficiency increase of 1。1%-points and specific power consumption (SPC) reduction 15。5 kWh/ton (-4。4%)， while for the former， the exergy efficiency increase amounted to 1。8%-points with 17。9 kWh/ton (-5。2%) lower SPC。 A complete thermodynamic mapping for the different cases was presented。 From an economic perspective， total liquid pumping reached levelized cost of oxygen reductions of 1。68 euro/ton (-4。7%)， while in the configuration with gas compressors it was limited to only 0。45 euro/ton (-1。2%)， relative to analogous ASU configurations with JouleThomson valve expansion。 The total liquid pumping scheme with TPE presented a cost reduction of 4。3 euro/ton (-11。2%) relative to the gaseous O2 compression counterpart。 N2 by-product monetization can further improve the plant economic performance。 Based on this assessment， integration of reliable TPE technology for incremental efficiency gains of pressurized O2 production in ASUs presents a promising opportunity to profitably contribute to energy efficiency and decarbonization goals。
Exergy analysisCryogenic air separationTwo-phase expandersEconomic evaluationSpecific power consumptionHEAT-EXCHANGERPOWER-CONSUMPTIONLIQUEFACTIONENHANCEMENTDESIGNCYCLEGENERATION
del Pozo, Carlos Arnaiz、Alvaro, Angel Jimenez、Casano, Juan Jose Roncal、Cloete, Schalk
NSTL
Elsevier
