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Ignition of two-component and three-component fuel mixtures based on brown coal and char under slow heating conditions

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Abstract

The paper presents a comparison of combustion processes of two- and three-component fuel mixtures based on char and two brown coals with different technical and elemental composition, applying thermogravimetric analysis in an air flow, at a heating rate of 20 °C min−1. From the mass loss, mass change rate (TG/DTG) curves showing the combustion process of the fuels, the following characteristics were determined: ignition temperature, burnout temperature and combustion index. Using differential scanning calorimetry (DSC) curves, endothermic and exothermic effects as well as maximum heat flux intensities during fuel combustion were determined. Based on the results of these studies, a linear dependence of the combustion index on the combustion heat of two- and three-component fuels was established for the first time. An increase in the calorific value of the fuel mixture by more than 7% affects a decrease in the combustion index to 100%. A maximum percentage of char not exceeding 20–30% added to two- and three-component fuel mixtures, exceeding which will entail a reduction in the combustion characteristics of the mixtures has been established. It is noted that three-component fuel mixtures are promising for practical application, as the addition of two high-reaction and high-energy fuel components to the base fuel has a positive effect on increasing the energy characteristics of the mixture and reducing the duration of the induction period.

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Abbreviations

A ad :

Ash (mass%)

C ad, H ad, N ad, O ad, S ad :

Fraction of carbon, hydrogen, nitrogen, oxygen and sulfur in the coal converted to an air-dried basis (%)

FC ad :

Fixed carbon (mass%)

HHV :

Higher heating value (MJ kg–1)

M ad :

Total moisture based on the air-dried basis (mass%)

Q peak1- 2 :

Maximum heat flux intensity (W g–1)

R max :

Maximum mass loss rate (mass% min–1)

R mean :

Average mass loss rate (from ignition to burnout) (mass% min–1)

S :

Combustion index (10–6/min–2 °C–3)

T b :

Burnout temperature (°C)

T i :

Ignition temperature (°C)

T peak1-2 :

Temperature of the maximum heat flux intensity (°C)

V ad :

Volatile matter based on the dry, ash-free basis (mass%)

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Acknowledgements

This research was supported by the Russian Science Foundation [grant number 22-23-00040, https://rscf.ru/en/project/22-23-00040/].

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Authors and Affiliations

  1. Siberian Federal University, 79, Svobodny Avenue, Krasnoyarsk, Russia, 660041

    Andrey V. Zhuikov, Irina I. Grishina & Alexander S. Samoilo

  2. National Research Tomsk Polytechnic University, 30, Lenin Avenue, Tomsk, Russia, 634050

    Andrey V. Zhuikov & Dmitrii O. Glushkov

  3. Institute of Chemistry and Chemical Technology, Siberian Branch of RAS, 50/24, Akademgorodok, Krasnoyarsk, Russia, 660036

    Andrey V. Zhuikov & Petr N. Kuznetsov

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  1. Andrey V. Zhuikov
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  2. Dmitrii O. Glushkov
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  3. Petr N. Kuznetsov
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Contributions

AV Zhuikov: Resources, Investigation, Writing - original draft, Data curation, Validation. DO Glushkov: Funding acquisition, Project administration, Supervision, Conceptualization. PN Kuznetsov: Data curation, Validation, Writing - original draft. II Grishina: Investigation, Writing - original draft. AS Samoilo: Investigation, Software, Visualization.

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Correspondence to Andrey V. Zhuikov.

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Zhuikov, A.V., Glushkov, D.O., Kuznetsov, P.N. et al. Ignition of two-component and three-component fuel mixtures based on brown coal and char under slow heating conditions. J Therm Anal Calorim 147, 11965–11976 (2022). https://doi.org/10.1007/s10973-022-11406-4

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