Experimental and theoretical investigation of heat and mass transfer processes during wood pyrolysis

Park, Won Chan; Atreya, Arvind; Baum, Howard R.

doi:10.1016/j.combustflame.2009.10.006

Cited by 321 publications

(340 citation statements)

References 26 publications

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“…Since these effects can have a significant impact on the heat balance of the process, definitely, when the development of thermal biomass processing methods it is necessary to have both a qualitative understanding of them and the corresponding quantitative data. The published data on the thermal effects [6][7][8][9], which are observed during biomass pyrolysis, for the most part have a qualitative and sometimes contradictory nature. Comparison of these data is difficult due to the difference of the experimental conditions in which they were carried out.…”

Section: Introductionmentioning

confidence: 99%

Exothermic effect during torrefaction

Faleeva

Синельщиков

Sytchev

et al. 2018

J. Phys.: Conf. Ser.

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Abstract. There are presented the results of investigation of exothermal effect taking place during torrefaction process. Experiments were carried out with the help of thermoanalyzer SDT Q600, that gives opportunity to use methods of differential thermogravimetric analysis and differential scanning calorimetry, and at the lab-scale installation modelling the columntype torrefaction reactor with indirect (through the wall) heating of processable raw material. It was ascertained the correspondence between the processes of thermal decomposition of basic organic components of wood (hemicellulose, cellulose and lignin) and the characteristic endoand exothermic peaks on the curve of effective heat capacity. It was shown that the exothermal effect accompanying thermal decomposition of hemicellulose, taking place during torrefaction, may lead to spontaneous heating of wood biomass to temperatures significantly exceeding the wall temperature.

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Section: Introductionmentioning

confidence: 99%

Exothermic effect during torrefaction

Faleeva

Синельщиков

Sytchev

et al. 2018

J. Phys.: Conf. Ser.

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“…When one fifth of species standard state enthalpy, namely total enthalpy, 965.6 kJ/kg is adopted, reasonable results can be obtained. However, this enthalpy value is slightly higher than the values obtained by other researchers [31] [32]. The species standard state enthalpy used in this numerical analysis is only for the decomposition of volatile gas, while other researchers' data may be for the total pyrolysis process of solid wood pieces, which includes exothermic reaction of char formation.…”

Section: Endothermic Reactionmentioning

confidence: 60%

“…According to the other researchers [31] [32], volatile gas formation from wood particle is an endothermic reaction while char formation from wood is an exothermic reaction. The enthalpy of total pyrolysis is the sum of the both reaction enthalpies.…”

Section: Volatile Formationmentioning

confidence: 99%

Numerical Analysis on Wood Pyrolysis in Pre-Vacuum Chamber

Homma¹,

Homma²,

Idris³

2014

JSBS

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In the previous experimental work, a new technology system for wood pyrolysis was developed to aim at mitigating climate change, global warming, and energy crisis as well as enhancing low electrification in rural areas in developing countries. The new technology system equipped with a pre-vacuum chamber requires low cost and less maintenance. However, large wood pyrolysis in the pre-vacuum chamber is rather complicated. To obtain a good understanding of the previous experimental results, a numerical analysis taking account of heat-mass transfer and chemical reaction is carried out. Two-step general reaction model is proposed for the numerical analysis. The first stage is volatile and char formation from the wood pieces and the second state is decomposition of the volatile to five species including vapor of tar. In this analysis, chemical formulae of the volatile and the tar are successfully identified hypothetically. The results obtained by this numerical analysis can explain the experimental results reasonably and provide useful information about time evolution of volatile formation, temperature change in pre-vacuum chamber with time, and species mole concentration decomposed from the volatile.

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“…Probably, that the most perspective is the approach of forecasting of forest fire danger on concrete forested territories for the purpose of development and carrying out of warning actions. The important process at forest fire danger beginning is drying of surface forest fuel under the influence of environmental conditions directly ahead of influence of local heating source [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%