Kinetic parameters and reactivity for the steam gasification of coal chars obtained under different pyrolysis temperatures and pressures

J. Fermoso, M. V. Gil, Susana Garcia, C. Pevida, J. J. Pis, F. Rubiera

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

The effect of devolatilization conditions (pressure and temperature) on the steam gasification kinetics and reactivity of coal chars was investigated. For this purpose, five different rank coals were selected: a lignite (LT), two high-volatile bituminous coals (DT and SA), a low-volatile bituminous coal (DI), and a semianthracite (HV). The coal chars were obtained by devolatilization in a novel pressurized fixed-bed reactor at temperatures of 800, 900, and 1000 degrees C and pressures of 1, 5, 10, and 20 atm. The reactivity of the chars was studied by isothermal thermogravimetric analysis in a kinetically controlled regime at different temperatures under a steam atmosphere. The reactive behavior of the chars was evaluated by means of the random pore model (RPM), which satisfactorily described the steam gasification of the coal chars. The gasification apparent reaction rate increased as the devolatilization pressure increased, whereas this parameter decreased as the devolatilization temperature increased.

Original languageEnglish
Pages (from-to)3574-3580
Number of pages7
JournalEnergy and Fuels
Volume25
Issue number8
Early online date22 Jun 2011
DOIs
Publication statusPublished - Aug 2011

Keywords

  • PULVERIZED COAL
  • BITUMINOUS COAL
  • COMBUSTION
  • DEVOLATILIZATION
  • BEHAVIOR
  • CO2
  • GASIFIER
  • MODEL

Cite this