Kinetic behavior of torrefied biomass in an oxidative environment

Dhruv Tapasvi, Roger Khalil, G. Várhegyi, Øyvind Skreiberg, Khanh Quang Tran, Morten Grønli

Research output: Article

29 Citations (Scopus)

Abstract

The combustion of four torrefied wood samples and their feedstocks (birch and spruce) was studied at slow heating programs, under well-defined conditions by thermogravimetry (TGA). Particularly low sample masses were employed to avoid the self-heating of the samples because of the huge reaction heat of the combustion. Linear, modulated, and constant reaction rate (CRR) temperature programs were employed in the TGA experiments in gas flows of 5 and 20% O 2. In this way, the kinetics was based on a wide range of experimental conditions. The ratio of the highest and lowest peak maxima was around 50 in the experiments used for the kinetic evaluation. A recent kinetic model by Várhegyi et al. (Várhegyi, G.; Sebestyén, Z.; Czégény, Z.; Lezsovits, F.; Könczöl, S.Energy Fuels 2012, 26, 1323-1335) was employed with modifications. This model consists of two devolatilization reactions and a successive char burnoff reaction. The cellulose decomposition in the presence of oxygen has a self-accelerating (autocatalytic) kinetics. The decomposition of the non-cellulosic parts of the biomass was described by a distributed activation model. The char burnoff was approximated by power-law (n-order) kinetics. Each of these reactions has its own dependence upon the oxygen concentration that was expressed by power-law kinetics too. The complexity of the applied model reflects the complexity of the studied materials. The model contained 15 unknown parameters for a given biomass. Part of these parameters could be assumed common for the six samples without a substantial worsening of the fit quality. This approach increased the average experimental information for an unknown parameter by a factor of 2 and revealed the similarities in the behavior of the different samples.

Original languageEnglish
Pages (from-to)1050-1060
Number of pages11
JournalEnergy and Fuels
Volume27
Issue number2
DOIs
Publication statusPublished - febr. 21 2013

Fingerprint

Biomass
Kinetics
Thermogravimetric analysis
Oxygen
Decomposition
Heating
Cellulose
Feedstocks
Reaction rates
Flow of gases
Wood
Experiments
Chemical activation
Temperature

ASJC Scopus subject areas

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

Cite this

Tapasvi, D., Khalil, R., Várhegyi, G., Skreiberg, Ø., Tran, K. Q., & Grønli, M. (2013). Kinetic behavior of torrefied biomass in an oxidative environment. Energy and Fuels, 27(2), 1050-1060. https://doi.org/10.1021/ef3019222

Kinetic behavior of torrefied biomass in an oxidative environment. / Tapasvi, Dhruv; Khalil, Roger; Várhegyi, G.; Skreiberg, Øyvind; Tran, Khanh Quang; Grønli, Morten.

In: Energy and Fuels, Vol. 27, No. 2, 21.02.2013, p. 1050-1060.

Research output: Article

Tapasvi, D, Khalil, R, Várhegyi, G, Skreiberg, Ø, Tran, KQ & Grønli, M 2013, 'Kinetic behavior of torrefied biomass in an oxidative environment', Energy and Fuels, vol. 27, no. 2, pp. 1050-1060. https://doi.org/10.1021/ef3019222
Tapasvi D, Khalil R, Várhegyi G, Skreiberg Ø, Tran KQ, Grønli M. Kinetic behavior of torrefied biomass in an oxidative environment. Energy and Fuels. 2013 febr. 21;27(2):1050-1060. https://doi.org/10.1021/ef3019222
Tapasvi, Dhruv ; Khalil, Roger ; Várhegyi, G. ; Skreiberg, Øyvind ; Tran, Khanh Quang ; Grønli, Morten. / Kinetic behavior of torrefied biomass in an oxidative environment. In: Energy and Fuels. 2013 ; Vol. 27, No. 2. pp. 1050-1060.
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