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      https://www.ias.ac.in/article/fulltext/jess/125/07/1365-1377

    • Keywords

       

      Low-quality coal; Indian coal; CO2-gasification; thermogravimetric analysis; model-free kinetics

    • Abstract

       

      Coal gasification with CO$_2$ has emerged as a cleaner and more efficient way for the production of energy, and it offers the advantages of CO$_2$ mitigation policies through simultaneous CO$_2$ sequestration. In the present investigation, a feasibility study on the gasification of three low-quality, high-sulphur coals fromthe north-eastern region (NER) of India in a CO$_2$ atmosphere using thermogravimetric analysis (TGADTA) has been made in order to have a better understanding of the physical and chemical characteristics in the process of gasification of coal. Model-free kinetics was applied to determine the activation energies (E) and pre-exponential factors (A) of the CO$_2$ gasification process of the coals. Multivariate nonlinear regression analyses were performed to find out the formal mechanisms, kinetic model, and the corresponding kinetic triplets. The results revealed that coal gasification with CO$_2$ mainly occurs in the temperature range of 800◦–1400◦C and a maximum of at around 1100◦C. The reaction mechanisms responsible for CO$_2$ gasification of the coals were observed to be of the ‘nth order with autocatalysis (CnB)’ and ‘nth order (Fn) mechanism’. The activation energy of the CO$_2$ gasification was found to be in the range 129.07–146.81 kJ mol$^{−1}$.

    • Author Affiliations

       

      Tonkeswar Das1 Ananya Saikia1 Banashree Mahanta1 Rahul Choudhury1 Binoy K Saikia1

      1. Polymer Petroleum and Coal Chemistry Group, Materials Science & Technology Division, CSIR-North East Institute of Science and Technology, Jorhat 785 006, Assam, India
    • Dates

       
  • Journal of Earth System Science | News

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