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The calculation of the chemical exergies of coal-based fuels by using the higher heating values

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  • Bilgen, Selçuk
  • Kaygusuz, Kamil

Abstract

This paper demonstrates the application of exergy to gain a better understanding of coal properties, especially chemical exergy and specific chemical exergy. In this study, a BASIC computer program was used to calculation of the chemical exergies of the coal-based fuels. Calculations showed that the chemical composition of the coal influences strongly the values of the chemical exergy. The exergy value of a coal is closely related to the H:C and O:C ratios. High proportions of hydrogen and/or oxygen, compared to carbon, generally reduce the exergy value of the coal. High contents of the moisture and/or the ash cause to low values of the chemical exergy. The aim of this paper is to calculate the chemical exergy of coals by using equations given in the literature and to detect and to evaluate quantitatively the effect of irreversible phenomena increased the thermodynamic imperfection of the processes. In this paper, the calculated exergy values of the fuels will be useful for energy experts studied in the coal mining area and coal-fired powerplants.

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  • Bilgen, Selçuk & Kaygusuz, Kamil, 2008. "The calculation of the chemical exergies of coal-based fuels by using the higher heating values," Applied Energy, Elsevier, vol. 85(8), pages 776-785, August.
    • Handle: RePEc:eee:appene:v:85:y:2008:i:8:p:776-785
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    4. Bilgen, Selçuk & Keleş, Sedat & Kaygusuz, Kamil, 2012. "Calculation of higher and lower heating values and chemical exergy values of liquid products obtained from pyrolysis of hazelnut cupulae," Energy, Elsevier, vol. 41(1), pages 380-385.
    5. Gharagheizi, Farhad & Ilani-Kashkouli, Poorandokht & Mohammadi, Amir H. & Ramjugernath, Deresh, 2014. "A group contribution method for determination of the standard molar chemical exergy of organic compounds," Energy, Elsevier, vol. 70(C), pages 288-297.
    6. Huang, Weijia & Zheng, Danxing & Chen, Xiaohui & Shi, Lin & Dai, Xiaoye & Chen, Youhui & Jing, Xuye, 2020. "Standard thermodynamic properties for the energy grade evaluation of fossil fuels and renewable fuels," Renewable Energy, Elsevier, vol. 147(P1), pages 2160-2170.
    7. Song, Guohui & Xiao, Jun & Zhao, Hao & Shen, Laihong, 2012. "A unified correlation for estimating specific chemical exergy of solid and liquid fuels," Energy, Elsevier, vol. 40(1), pages 164-173.
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    9. Huang, Youwang & Wang, Haiyong & Zhang, Xinghua & Zhang, Qi & Wang, Chenguang & Ma, Longlong, 2022. "Accurate prediction of chemical exergy of technical lignins for exergy-based assessment on sustainable utilization processes," Energy, Elsevier, vol. 243(C).
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    11. Mollanoori, Mohammad & Dehghan, Ali Akbar, 2024. "Estimating the higher heating value and chemical exergy of solid, liquid, and natural gas fossil fuels," Energy, Elsevier, vol. 302(C).
    12. Gharagheizi, Farhad & Ilani-Kashkouli, Poorandokht & Hedden, Ronald C., 2018. "Standard molar chemical exergy: A new accurate model," Energy, Elsevier, vol. 158(C), pages 924-935.
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