Combustion Properties of Several Species of Wood (original) (raw)
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Combustion Properties of Some Tropical Wood Species and Their Pyrolytic Products Characterization
This paper evaluates the combustion properties of fuelwood and pyrolytic products from three selected sawmill wood residues - Gmelina arborea, Terminalia superba and Triplochiton scleroxylon. Pyrolysis experiments were performed at 450, 500 and 550°C. The percentage oil, pH, viscosities were considered. The highest yield of oil yield was at 550°C (45.70%) for Triplochiton scleroxylon out of the three sawmill wood residues. The analysis of variance conducted on pyrolytic oil produced at 450, 500 and 550°C for the G. arborea, and T. scleroxylon showed no significant difference but there were significant differences in the pH and viscosity of the pyrolytic liquid produced from selected wood species at the same conversion temperatures. The result showed the proximate analysis of the selected wood residues with the ash content (2.75, 2.61, and 3.57 %); fixed carbon (10.52, 12.07 and 10.23%); volatile (87.55, 85.48 and 86.46%) and heating value of 32792.75, 32691.56 and 32794.15 KJ/kg for Gmelina arborea, Terminalia superba and Triplochiton scleroxylon respectively. Proximate analysis results showed that the selected wood residues have good potential for domestic cooking and the characterized pyrolytic oil produced for biofuel production, most importantly for bioenergy sustainable system.
Effective heat of combustion for flaming combustion of conifers
Canadian Journal of Forest Research, 2006
The heat of combustion of burning trees is often used in forest-fire hazard modeling to relate mass-loss results to the heat produced; therefore reliable values are needed. Experimental results for the effective heat of combustion of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) trees are presented as a function of moisture content. It is also shown that during a forest fire, the effective heat of combustion does not correspond to the oxygen-bomb-test value. Instead, the value will always be lower, since the heat of combustion of char is higher than that of the pyrolysate vapors, and char mostly remains unburned during a forest fire. These are the first and only experimental results obtained from testing of actual trees. But results from benchmark testing and studies on wood products by other investigators are broadly consistent with our findings. It is further shown that moisture content has a major effect on the effective heat of combustion. A quantitative expression for the ...
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Thermogravimetric analysis was employed to investigate the combustion characteristics of flax shives, beech wood, hemicellulose, cellulose, lignin, and their chars. The chars were prepared from raw materials in a fixed-bed reactor at 850 °C. In this study, the thermal behavior based on characteristic temperatures (ignition, maximum, and final temperatures), burnout time and maximum rate was investigated. The kinetic parameters for the combustion of different materials were determined based on the Coats-Redfern approach. The results of our study revealed that the combustion of pure pseudo-components behaved differently from that of biomass. Indeed, principal component analysis showed that the thermal behavior of both biomasses was generally similar to that of pure hemicellulose. However, pure cellulose and lignin showed different behaviors compared to flax shives, beech wood, and hemicellulose. Hemicellulose and cellulose chars had almost the same behaviors, while being different fro...