Oxidation reactivity of coal chars: a simple kinetic analysis

Edwige Sima-Ella, Tim Mays

Research output: Contribution to conferencePaper

Abstract

The intrinsic reactivity in air of three ranks of coals as anthracite, bituminous and subbituminous, was investigated using a new thermogravimetric technique. The conventional single heating rate measurement is enhanced by identifying an optimum-heating rate at which mass transfer limitations are reduced, and true kinetic data are derived. This anal. is presented using the simplest approxn. of the temp. integral from the Arrhenius equation. An optimum-heating rate of 25 DegC min-1 was obsd. for all the different type of coals, producing reactivity data that correspond to those proposed in the literature for similar materials. Furthermore, these results were compared with values derived from using an existing "isoconversional" anal. approach. They showed good agreement. Such an improved thermogravimetric anal. is relatively simple and sufficiently accurate for applications in coal characterization. [on SciFinder (R)]
Original languageEnglish
Publication statusPublished - 2005
EventWorld Congress of Chemical Engineering, 7th - Glasgow, UK United Kingdom
Duration: 10 Jul 200514 Jul 2005

Conference

ConferenceWorld Congress of Chemical Engineering, 7th
CountryUK United Kingdom
CityGlasgow
Period10/07/0514/07/05

Keywords

  • coal char oxidn reactivity coal combustion kinetics
  • PROC (Process) (oxidn. reactivity of coal chars
  • Semicoke Role
  • Reactivity (oxidn. reactivity of coal chars
  • Combustion kinetics
  • Oxidation
  • a simple kinetic anal.)
  • PEP (Physical
  • CPS (Chemical process)
  • engineering or chemical process)

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    Sima-Ella, E., & Mays, T. (2005). Oxidation reactivity of coal chars: a simple kinetic analysis. Paper presented at World Congress of Chemical Engineering, 7th, Glasgow, UK United Kingdom.