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Synergistic effect on co-pyrolysis mechanism and kinetics of waste coal blended with high-rank coal and biomass

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Abstract

In this work, a comprehensive and systematic study on synergistic effect and kinetics of three coal ranks (anthracite coal, bituminous coal, and waste coal), and three biomass materials (wheat straw, sawdust, groundnut) were performed under different blending ratios. The kinetic parameters of coal and biomass devolatilization were estimated by means of thermogravimetric analysis (TGA) at 10, 20, 30 and 40 Kmin−1. These kinetic parameters were subsequently validated using Artificial Neural Network (ANN) Model. Further, for fitting the experimental data, a numerical approach to distributed activation energy model (DAEM) has been evaluated and the experimental findings were compared with simulated data. Subsequently, the kinetic and thermodynamic parameters were estimated and compared with three model-free methods viz., KAS, OFW, and Friedman. The results from TG study indicate that the interactions between the waste coal with higher rank coal and biomass samples present an inhibitive effect during the devolatilization process. Furthermore, the values of activation energy were found in the range of 270, 250, 149 kJmol−1 by using OFW, KAS and Friedman model, respectively. Additionally, the thermodynamic parameters viz., enthalpy (ΔH), Gibbs free energy (ΔG) and entropy (ΔS) were estimated as 275.2 kJ mol−1, 184.5 kJmol−1, and 59.7 Jmol−1, respectively.

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Acknowledgements

Authors are thankful to Director, CSIR-CMERI Durgapur and Director, National Institute of Technology Durgapur, for their support to carry out this research work. The authors extend their gratitude to Dr. Prabhansu, Assistant Professor, Department of Mechanical Engineering, SVNIT Surat, India, for kind cooperation and support during the sample characterization.

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Authors and Affiliations

  1. Department of Mechanical Engineering, National Institute of Technology, Durgapur, West Bengal, 713209, India

    Krishna Kant Dwivedi & A. K. Pramanick

  2. Energy Research & Technology Group, CSIR-Central Mechanical Engineering Research Institute, Durgapur, West Bengal, 713213, India

    M. K. Karmakar & P. K. Chatterjee

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  1. Krishna Kant Dwivedi
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  2. A. K. Pramanick
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  3. M. K. Karmakar
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  4. P. K. Chatterjee
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KKD was involved in conceptualization, methodology and writing original draft. AKP was involved in manuscript—review & editing. MKK, AKP and PKC were involved in supervision.

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Correspondence to Krishna Kant Dwivedi.

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Dwivedi, K.K., Pramanick, A.K., Karmakar, M.K. et al. Synergistic effect on co-pyrolysis mechanism and kinetics of waste coal blended with high-rank coal and biomass. J Therm Anal Calorim 147, 8323–8343 (2022). https://doi.org/10.1007/s10973-021-11123-4

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