Investigation of emissions from heated essential-oil-rich fuels at 200 ℃

摘要

Essential oil of fuels is closely linked with the behavior of forest fires, especially high intensity fires and eruptive fires. It is assumed that the potential reason is the large quantities of flammable gases released from essential oil-rich fuels before pyrolysis in fire environment. However, few studies have been carried out on the hypothesis. The purpose of the present study is to investigate the emissions from essential oil-rich fuels. The fuels were collected from three coniferous species. In the experiment, needles and twigs were heated in a vacuum oven at 200 ℃, and the emissions within 15min had been sampled using Tenax tubes. Gas chromatography-mass spectrometry served as an analytical instrument. The results showed that the emissions contained high proportion of monoterpenes, such as α-pinene, camphene, β-pinene, 3-carene, and D-limonene. The monoterpene emissions from heated needles and twigs of Pinuspumila, Larix gmelinii, and Pinus sylvestris were 61.221, 49.606, and 37.853 μgg~(-1) dry weight (needles), and 211.727, 139.957, and 121.505 μgg~(-1) dry weight (twigs), respectively. Statistical analyses showed the significant differences not only among species but also between needles and twigs.