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Comparative Energy and Emission Analysis of Oxy-Combustion and Conventional Air Combustion

  • Research Article-Mechanical Engineering
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Abstract

Carbon capture and storage and oxy-fuel combustion have recently become more significant due to global warming as well as green energy solutions. Oxy-combustion power plants fueled with natural gas are compatible with today’s clean energy policies. In this study, effects of oxygen content of reactant mixtures used in oxy-combustion on thermodynamic properties, adiabatic flame temperatures, combustion products and pollutant emissions are analyzed using a novel multi-feature equilibrium combustion model. Using natural gas from most important origins (Russia, USA, Iran, Australia) as fuel, results obtained from oxy-fuel combustion for three different O2 fractions are compared with the results of conventional air–fuel combustion for varying equivalence ratio, inlet temperature and pressure. The accuracy of the results is confirmed by two different popular combustion softwares. According to the results, oxy-fuel combustion of same oxygen content with air causes 24% less entropy production but 40 times less NOx emissions which is an indicator of significant decrease in carbon capture and storage costs. Comparison of natural gas of different origins shows that Russian natural gas is more advantageous in terms of NOx emissions where Australian natural gas is more advantageous in terms of entropy production.

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Abbreviations

a :

Mole number of reactant O2

b :

Mole number of reactant CO2

c :

Mole number of reactant N2

C :

Specific heat (kJ/kg K)

CC:

Combustion chamber

E :

Energy

FA:

Fuel/air ratio

h :

Specific enthalpy (kJ/kg)

K :

Equilibrium constant

MW:

Molecular weight

N :

Total number of moles of species

NG:

Natural gas

s :

Specific entropy (kJ/kg K)

T :

Temperature (K)

V :

Volume

X :

Total number of carbon atoms

Y :

Total number of hydrogen atoms

Z :

Total number of oxygen atoms

Q :

Total number of nitrogen atoms

α :

Mole fraction

ε :

Molar air–fuel ratio

Φ :

Equivalence ratio

χ :

Number of moles of exhaust species

a:

Air

ady:

Adiabatic

f:

Fuel

fu:

Fluid or oxidant

in:

Inlet

k :

Exhaust species

p :

Pressure

r:

Reactants

s:

Stoichiometric

wf:

Working fluid

x :

Number of carbon atoms

y :

Number of hydrogen atoms

z :

Number of oxygen atoms

q :

Number of nitrogen atoms

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Acknowledgements

This work is compiled from the first author’s unpublished PhD dissertation. We would like to thank the Turkish Academy of Sciences (TUBA-GEBIP) and The Scientific and Technological Research Council of Turkey (TUBITAK) for their support for graduate students.

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Authors and Affiliations

  1. Department of Naval Architecture and Marine Engineering, Yildiz Technical University, 34349, Besiktas, Istanbul, Turkey

    Ibrahim Ozsari & Yasin Ust

  2. Department of Marine Engineering Operations, Yildiz Technical University, 34349, Besiktas, Istanbul, Turkey

    Hasan Kayhan Kayadelen

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  1. Ibrahim Ozsari
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Correspondence to Ibrahim Ozsari.

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Ozsari, I., Ust, Y. & Kayadelen, H.K. Comparative Energy and Emission Analysis of Oxy-Combustion and Conventional Air Combustion. Arab J Sci Eng 46, 2477–2492 (2021). https://doi.org/10.1007/s13369-020-05130-0

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