Influence of Equation-of-States on Supercritical CO2 Combustion Mixtures

(Raghu) Manikantachari, K. R. V.; Rahman, Ramees K.; Martin, Scott M.; Velez, Carlos; Vasu, Subith S.

doi:10.1115/1.4048666

Influence of Equation-of-States on Supercritical CO2 Combustion Mixtures

Journal Article · Tue Oct 27 04:00:00 EDT 2020 · Journal of Energy Resources Technology

DOI:https://doi.org/10.1115/1.4048666· OSTI ID:1849158

(Raghu) Manikantachari, K. R. V. ^[1]; Rahman, Ramees K. ^[2]; Martin, Scott M. ^[3]; Velez, Carlos ^[4]; Vasu, Subith S. ^[2]

Center for Advanced Turbomachinery and Energy Research (CATER), University of Central Florida, Orlando, FL 32816; OSTI
Center for Advanced Turbomachinery and Energy Research, University of Central Florida, Orlando, FL 32816
Eagle Flight Research Center, Embry-Riddle Aeronautical University, Daytona Beach, FL 32114
GE Global Research Center, Niskayuna, NY 12309

Abstract

Fossil fuel based direct-fired supercritical CO2 (sCO2) cycles are gaining the attention of industry, academia, and government due to their remarkable efficiency and carbon capture at high-source temperatures. Modeling plays an important role in the development of sCO2 combustors because experiments are very expensive at the designed operating conditions of these direct-fired cycles. Inaccurate density estimates are detrimental to the simulation output. Hence, this work focuses on comprehensive evaluation of the influence and applicability of various equation-of-states (EOS) which are being used in the supercritical combustion modeling literature. A state-of-the-art supercritical combustion modeling methodology is used to simulate counter-flow supercritical CO2 flames by using various equation-of-states. The results show that using the corresponding state principle to evaluate compressibility factor is not accurate. Also, van der Waal type EOSs predictions can be as accurate as complex Benedict–Webb–Rubin EOSs; hence van der Waal EOSs are more suitable to simulate sCO2 combustor simulations. Non-ideal effects are significant under the operating conditions considered in this work. The choice of EOS significantly influences the flame structure and heat release rate. Also, assuming the binary interaction parameter as zero is reasonable in sCO2 combustion simulations.

Research Organization:: Univ. of Central Florida, Orlando, FL (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE)

DOE Contract Number:: FE0025260

OSTI ID:: 1849158

Journal Information:: Journal of Energy Resources Technology, Journal Name: Journal of Energy Resources Technology Journal Issue: 6 Vol. 143; ISSN 0195-0738

Publisher:: ASME

Country of Publication:: United States

Language:: English

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