An analysis of transient oxidation of magnetite to hematite in chemical looping combustion

Tianxiang Li, Fung Liu, Yunqing Han, Kunlei Liu, Kozo Saito

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

A comprehensive investigation of transient oxidation of magnetite to hematite was theoretically conducted, with emphasis on the influences of particle size, particle temperature, and environmental conditions on the oxidation rate and burnout time of the particles, which have been suggested to use as oxygen carries (OCs) in the chemical looping combustion (CLC). Two-step solid-state reaction and transition were applied for quasi-steady gas-phase reactions with heat and mass conservation along with transient particle heating and radiative heat transfer. Within particle size ranges of practical interests in the CLC the oxidation rate of magnetite to hematite depends on particle temperature and oxidizer concentrations. The results show that, while the temperature of magnetite particles increases continuously during oxidation, the final particle temperature at the completion of oxidation rapidly decreases as particle size increases and then slightly increases or is nearly constant. The lowest final particle temperature is for the particles around 100 μm in radius. Whereas the burnout time of the particles increases with increasing particle size, the initial particle temperature does slightly influence the burnout time with particles having lower initial temperatures needing longer time for complete oxidation.

Original languageEnglish
Title of host publicationFall Technical Meeting of the Eastern States Section of the Combustion Institute 2013
Pages374-379
Number of pages6
ISBN (Electronic)9781629937199
StatePublished - 2013
EventFall Technical Meeting of the Eastern States Section of the Combustion Institute 2013 - Clemson, United States
Duration: Oct 13 2013Oct 16 2013

Publication series

NameFall Technical Meeting of the Eastern States Section of the Combustion Institute 2013

Conference

ConferenceFall Technical Meeting of the Eastern States Section of the Combustion Institute 2013
Country/TerritoryUnited States
CityClemson
Period10/13/1310/16/13

ASJC Scopus subject areas

  • Mechanical Engineering
  • Chemical Engineering (all)
  • Physical and Theoretical Chemistry

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