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research-article

Effect of impurities on compressor and cooler performances in supercritical CO2 cycles

[+] Author and Article Information
Ladislav Veselý

Czech Technical University in Prague, Department of Energy Engineering, Prague, Czech Republic, Center for Advanced Turbomachinery and Energy Research (CATER), University of Central Florida, Orlando, FL, 32816
ladislav.vesely@fs.cvut.cz

K.R.V. Manikantachari

Center for Advanced Turbomachinery and Energy Research (CATER), University of Central Florida, Orlando, FL, 32816
raghuvmkc@Knights.ucf.edu

Subith Vasu

Center for Advanced Turbomachinery and Energy Research (CATER), University of Central Florida, Orlando, FL, 32816
subith@ucf.edu

Jayanta Kapat

Center for Advanced Turbomachinery and Energy Research (CATER), University of Central Florida, Orlando, FL, 32816
Jayanta.Kapat@ucf.edu

Vaclav Dostal

Czech Technical University in Prague, Department of Energy Engineering, Prague, Czech Republic
Vaclav.Dostal@fs.cvut.cz

Scott Martin

Eagle Flight Research Center, Embry-Riddle Aeronautical University, Daytona Beach, FL, 32114
martis38@erau.edu

1Corresponding author.

ASME doi:10.1115/1.4040581 History: Received May 11, 2018; Revised May 28, 2018

Abstract

The development of new power generation technologies is gaining increased attention. The supercritical carbon dioxide (S-CO2) cycle is one such technology, which has relatively high efficiency, compactness, and potentially could provide complete carbon capture. The S-CO2 cycle technology is adaptable for almost all of the existing heat sources such as solar, geothermal, fossil, nuclear power plants, and waste heat recovery systems. However, it is known that, optimal combinations of: operating conditions, equipment, working fuid, and cycle layout determine the maximum achievable efficiency of a cycle. Within an S-CO2 cycle the compression device is of critical importance as it is operating near the critical point of CO2. However, near the critical point, the thermo-physical properties of CO2 are highly sensitive to changes of pressure and temperature. Therefore, the conditions of CO2 at the compressor inlet are critical in the design of such cycles. Also, the impurity species diluted within the S-CO2 will cause deviation from an ideal S-CO2 cycle as these impurities will change the thermodynamic properties of the working fluid. Accordingly the current work examines the effects of different impurity compositions, considering binary mixtures of CO2 and: He, CO, O2, N2, H2, CH4, or H2S; on various S-CO2 cycle components. The second part of the study focuses on the calculation of the basic cycles and component efficiencies. The results of this study will provide guidance and defines the optimal composition of mixtures for compressors and coolers.

Copyright (c) 2018 by ASME
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