Comparison of global models of sub-bituminous coal devolatilization by means of thermogravimetric analysis

Carlos Herce, Benedetta De Caprariis, Stefano Stendardo, Nicola Verdone, Paolo De Filippis

Research output: Contribution to journalReview article

22 Citations (Scopus)

Abstract

Coal gasification and combustion are strongly dependent on devolatilization step. Aim of this work is to obtain the parameters of global kinetics of devolatilization of a sub-bituminous coal with high sulfur content. The kinetic parameters are obtained by means of TG experimental data, and applying different approaches to extrapolate the data to industrial relevant conditions. The simpler method is a model-free one which supposes a single step process whose Arrhenius kinetic parameters (A and Ea) have to be determined. Another common approach is the distributed activation energy model (DAEM) which assumes a series of first order parallel reactions occurring and sharing the same pre-exponential factor, A, with a continuous distribution of the activation energy. For the fitting of the experimental data, a numerical solution to DAEM and two approximate methods have been evaluated. Moreover, the results of these kinetic methods based on empirical approaches were compared with simulated data obtained using a more complex model based on percolation theory with cross-linking mechanism and vapor-liquid equilibrium (chemical percolation devolatilization, CPD model), which allows to simulate the coal pyrolysis from volatile yield data. © 2014 Akadémiai Kiadó, Budapest, Hungary.
Original languageEnglish
Pages (from-to)507 - 516
Number of pages10
JournalJournal of Thermal Analysis and Calorimetry
Volume117
Issue number1
DOIs
Publication statusPublished - 2014
Externally publishedYes

    Fingerprint

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

Cite this