Fly ash and coal char reactivity from Thermo-gravimetric (TGA) experiments

Leungo Kelebopile, Rui Sun, Jian Liao

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

The purpose of this research is to determine the reactivity of a sample of high carbon fly ash obtained from a circulating fluidized bed (CFB) gasification system and benchmark it against three other chars prepared at different pyrolysis temperatures in a laboratory drop tube furnace (DTF). Isothermal and non-isothermal thermo-gravimetric (TGA) experiments were used to determine sample reactivities. Structural analysis tests were carried out to establish the influence of the pore characteristics and Scanning Electron Microscope (SEM) pictures were taken for sample morphology. In-spite of high (BET) surface area and pore volume; reactivity parameters such as activation energy, kinetic rate coefficient, half life, burnout temperature and time proved the fly ash to be the least reactive. The low reactivity is associated with its carbon thermal deactivation. Non-isothermal tests also show the fly ash to be heterogeneous in composition. Of all the samples, the char prepared in the laboratory at the lowest pyrolysis temperature was the most reactive.

Original languageEnglish
Pages (from-to)1178-1186
Number of pages9
JournalFuel Processing Technology
Volume92
Issue number6
DOIs
Publication statusPublished - Jun 1 2011

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Coal Ash
Coal
Fly ash
Pyrolysis
Carbon
Experiments
Gasification
Structural analysis
Fluidized beds
Temperature
Furnaces
Electron microscopes
Activation energy
Scanning
Kinetics
Chemical analysis

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology

Cite this

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Fly ash and coal char reactivity from Thermo-gravimetric (TGA) experiments. / Kelebopile, Leungo; Sun, Rui; Liao, Jian.

In: Fuel Processing Technology, Vol. 92, No. 6, 01.06.2011, p. 1178-1186.

Research output: Contribution to journalArticle

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