Chemical Analysis of Solids and Pyrolytic Vapors from Wildland Trees
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- 作者：Alexander L. Brown ; Bonnie R. Hames ; John W. Daily ; and David C. Dayton
- 刊名：Energy & Fuels
- 出版年：2003
- 出版时间：July 2003
- 年：2003
- 卷：17
- 期：4
- 页码：1022 - 1027
- 全文大小：72K
- 年卷期：v.17,no.4(July 2003)
- ISSN：1520-5029
文摘
The pyrolysis chemistry of tree samples from plants commonly found in the forests of thewestern United States is evaluated and compared with wet chemical analysis of the originalmaterial. Wood, leaves, bark, needles, reaction wood, and sticks are individually examined.Molecular beam sampling mass spectrometric detection of pyrolytic compounds at furnace settingsof 500 
C with short residence times (on the order of 100 ms) permits mass spectral analysis ofthe chemical components in the primary decomposition regime. Multivariate analysis of thepyrolysis mass spectra yields three principal factors. One factor identifies leaf, needle, and barksamples and correlates well with the extractive content of the material; there is also a relationshipbetween this factor and the ash content of the material. The other two factors separate hardwoodand softwood samples; this distinction is based mainly on differences in the structure of lignindegradation products that are evident in the pyrolysis vapors. These measurements suggest thatthe extractives content of the fuel may be a natural chemical indicator that is useful for estimatingthe bulk pyrolysis chemistry in a way that can be practically implemented into wildland firemodels.
C with short residence times (on the order of 100 ms) permits mass spectral analysis ofthe chemical components in the primary decomposition regime. Multivariate analysis of thepyrolysis mass spectra yields three principal factors. One factor identifies leaf, needle, and barksamples and correlates well with the extractive content of the material; there is also a relationshipbetween this factor and the ash content of the material. The other two factors separate hardwoodand softwood samples; this distinction is based mainly on differences in the structure of lignindegradation products that are evident in the pyrolysis vapors. These measurements suggest thatthe extractives content of the fuel may be a natural chemical indicator that is useful for estimatingthe bulk pyrolysis chemistry in a way that can be practically implemented into wildland firemodels.