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Title: Kinetic investigation of wood pyrolysis

Abstract

The objective of this investigation was to determine the kinetics of the primary reactions of wood pyrolysis. A new experimental method was developed which enabled us to measure the rate of gas, tar, and char production while taking into account the temperature variations during the wood heating up. The experimental method developed did not require any sophisticated instruments. It facilitated the collection of gas, tar and residue (unreacted wood and char) as well as accurate measurement of the temperature inside the wood sample. Expressions relating the kinetic parameters to the measured variables were derived. The pyrolysis kinetics was investigated in the range of 300 to 400/sup 0/C at atmospheric pressure and under nitrogen atmosphere. Reaction temperature and mass fractions of gas, tar, and residue were measured as a function of time. Assuming first-order reactions, the kinetic parameters were determined using differential method. The measured activation energies of wood pyrolysis to gas, tar, and char were 88.6, 112.7, and 106.5 kJ/mole, respectively. These kinetic data were then used to predict the yield of the various pyrolysis products. It was found that the best prediction was obtained when an integral-mean temperature obtained from the temperature-time curve was used as reaction temperature. Themore » pyrolysis products were analyzed to investigate the influence of the pyrolysis conditions on the composition. The gas consisted mainly of carbon dioxide, carbon monoxide, oxygen, and C/sub 3//sup +/-compounds. The gas composition depended on reaction time as well as reactor temperature. The tar analysis indicated that the tar consisted of about seven compounds. Its major compound was believed to be levoglucosan. Elemental analysis for the char showed that the carbon content increased with increasing temperature.« less

Authors:
; ;
Publication Date:
Research Org.:
Texas Tech Univ., Lubbock (USA). Dept. of Chemical Engineering
Sponsoring Org.:
USDOE
OSTI Identifier:
6809951
Report Number(s):
DOE/ET/20041-T2
DOE Contract Number:  
AS04-76ET20041
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
09 BIOMASS FUELS; PYROLYSIS PRODUCTS; TEMPERATURE DEPENDENCE; WOOD; PYROLYSIS; CARBON DIOXIDE; CARBON MONOXIDE; CHARS; CHEMICAL COMPOSITION; CHEMICAL REACTION KINETICS; CONTROLLED ATMOSPHERES; DIAGRAMS; EXPERIMENTAL DATA; HIGH TEMPERATURE; HYDROCARBONS; OXYGEN; PYROLYTIC GASES; QUANTITY RATIO; TAR; ATMOSPHERES; CARBON COMPOUNDS; CARBON OXIDES; CHALCOGENIDES; CHEMICAL REACTIONS; DATA; DECOMPOSITION; ELEMENTS; FLUIDS; GASES; INFORMATION; KINETICS; NONMETALS; NUMERICAL DATA; ORGANIC COMPOUNDS; OTHER ORGANIC COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; REACTION KINETICS; THERMOCHEMICAL PROCESSES; 140504* - Solar Energy Conversion- Biomass Production & Conversion- (-1989); 090122 - Hydrocarbon Fuels- Preparation from Wastes or Biomass- (1976-1989)

Citation Formats

Thurner, F., Mann, U., and Beck, S. R. Kinetic investigation of wood pyrolysis. United States: N. p., 1980. Web. doi:10.2172/6809951.
Thurner, F., Mann, U., & Beck, S. R. Kinetic investigation of wood pyrolysis. United States. https://doi.org/10.2172/6809951
Thurner, F., Mann, U., and Beck, S. R. 1980. "Kinetic investigation of wood pyrolysis". United States. https://doi.org/10.2172/6809951. https://www.osti.gov/servlets/purl/6809951.
@article{osti_6809951,
title = {Kinetic investigation of wood pyrolysis},
author = {Thurner, F. and Mann, U. and Beck, S. R.},
abstractNote = {The objective of this investigation was to determine the kinetics of the primary reactions of wood pyrolysis. A new experimental method was developed which enabled us to measure the rate of gas, tar, and char production while taking into account the temperature variations during the wood heating up. The experimental method developed did not require any sophisticated instruments. It facilitated the collection of gas, tar and residue (unreacted wood and char) as well as accurate measurement of the temperature inside the wood sample. Expressions relating the kinetic parameters to the measured variables were derived. The pyrolysis kinetics was investigated in the range of 300 to 400/sup 0/C at atmospheric pressure and under nitrogen atmosphere. Reaction temperature and mass fractions of gas, tar, and residue were measured as a function of time. Assuming first-order reactions, the kinetic parameters were determined using differential method. The measured activation energies of wood pyrolysis to gas, tar, and char were 88.6, 112.7, and 106.5 kJ/mole, respectively. These kinetic data were then used to predict the yield of the various pyrolysis products. It was found that the best prediction was obtained when an integral-mean temperature obtained from the temperature-time curve was used as reaction temperature. The pyrolysis products were analyzed to investigate the influence of the pyrolysis conditions on the composition. The gas consisted mainly of carbon dioxide, carbon monoxide, oxygen, and C/sub 3//sup +/-compounds. The gas composition depended on reaction time as well as reactor temperature. The tar analysis indicated that the tar consisted of about seven compounds. Its major compound was believed to be levoglucosan. Elemental analysis for the char showed that the carbon content increased with increasing temperature.},
doi = {10.2172/6809951},
url = {https://www.osti.gov/biblio/6809951}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Jun 01 00:00:00 EDT 1980},
month = {Sun Jun 01 00:00:00 EDT 1980}
}