Characterization of high-temperature rapid char oxidation of raw and torrefied biomass fuels

Jun Li, Giorgio Bonvicini, Enrico Biagini, Weihong Yang, Leonardo Tognotti

Research output: Contribution to journalArticle

12 Citations (Scopus)
167 Downloads (Pure)

Abstract

The promising properties of torrefied biomass provide a valid co-firing option for large percentage biomass utilization in existing coal-fired boilers. Torrefied biomass is expected to have a better combustion stability than raw biomass and similar to that of coal. The present work will characterizes the oxidation properties of torrefied biomass char and compare with that of raw biomass char. The studied two chars are produced from raw and torrefied biomass in an Isothermal Plug Flow Reactor (IPFR) at high temperature and high heating rate, a sufficient residence time is applied for the completion of the high temperature devolatilization. Char oxidation tests are carried out in the IPFR by varying temperature, oxygen concentration and residence time. The reactivity of two studied chars are analyzed and compared with referenced biomass char and coal char, and the impact of torrefaction on char reactivity is also discussed in this paper. Finally, the char oxidation kinetic parameters are determined using a parameter optimization method, and the obtained kinetics are examined by comparing the experimental and predicted mass conversions.

Original languageEnglish
Pages (from-to)492-498
Number of pages7
JournalFuel
Volume143
Early online date8 Dec 2014
DOIs
Publication statusPublished - 1 Mar 2015

Fingerprint

Biomass
Oxidation
Temperature
Coal
Coal fired boilers
Heating rate
Kinetic parameters
Oxygen
Kinetics

Keywords

  • char oxidation
  • high temperature
  • kinetics
  • torrefaction

Cite this

Li, Jun ; Bonvicini, Giorgio ; Biagini, Enrico ; Yang, Weihong ; Tognotti, Leonardo. / Characterization of high-temperature rapid char oxidation of raw and torrefied biomass fuels. In: Fuel. 2015 ; Vol. 143. pp. 492-498.
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Characterization of high-temperature rapid char oxidation of raw and torrefied biomass fuels. / Li, Jun; Bonvicini, Giorgio; Biagini, Enrico; Yang, Weihong; Tognotti, Leonardo.

In: Fuel, Vol. 143, 01.03.2015, p. 492-498.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Characterization of high-temperature rapid char oxidation of raw and torrefied biomass fuels

AU - Li, Jun

AU - Bonvicini, Giorgio

AU - Biagini, Enrico

AU - Yang, Weihong

AU - Tognotti, Leonardo

PY - 2015/3/1

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N2 - The promising properties of torrefied biomass provide a valid co-firing option for large percentage biomass utilization in existing coal-fired boilers. Torrefied biomass is expected to have a better combustion stability than raw biomass and similar to that of coal. The present work will characterizes the oxidation properties of torrefied biomass char and compare with that of raw biomass char. The studied two chars are produced from raw and torrefied biomass in an Isothermal Plug Flow Reactor (IPFR) at high temperature and high heating rate, a sufficient residence time is applied for the completion of the high temperature devolatilization. Char oxidation tests are carried out in the IPFR by varying temperature, oxygen concentration and residence time. The reactivity of two studied chars are analyzed and compared with referenced biomass char and coal char, and the impact of torrefaction on char reactivity is also discussed in this paper. Finally, the char oxidation kinetic parameters are determined using a parameter optimization method, and the obtained kinetics are examined by comparing the experimental and predicted mass conversions.

AB - The promising properties of torrefied biomass provide a valid co-firing option for large percentage biomass utilization in existing coal-fired boilers. Torrefied biomass is expected to have a better combustion stability than raw biomass and similar to that of coal. The present work will characterizes the oxidation properties of torrefied biomass char and compare with that of raw biomass char. The studied two chars are produced from raw and torrefied biomass in an Isothermal Plug Flow Reactor (IPFR) at high temperature and high heating rate, a sufficient residence time is applied for the completion of the high temperature devolatilization. Char oxidation tests are carried out in the IPFR by varying temperature, oxygen concentration and residence time. The reactivity of two studied chars are analyzed and compared with referenced biomass char and coal char, and the impact of torrefaction on char reactivity is also discussed in this paper. Finally, the char oxidation kinetic parameters are determined using a parameter optimization method, and the obtained kinetics are examined by comparing the experimental and predicted mass conversions.

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