Abstract:

Pyrolysis processes of 12 herbaceous species grown in Maoershan in Heilongjiang Province were studied by the Thermogravimetric analysis with a temperature rising rate of 10 ℃·min^-1. The TG-DTG curves of these fuels were used to analyze their pyrolysis characteristics. The results showed that the pyrolysis processes of the 12 species could be separated into three phases. Flammability of the 12 species was evaluated by the average decomposition rate of the three phases and the starting pyrolysis temperature. The three phases are: 1) dehydration when temperature is ambient one to 120 ℃. Athyrium multidentatum, Paeonia lactiflora, and Aquilegia vulgaris are the most flammable species when evaluated by the mean dehydration rate and the starting pyrolysis temperature. 2) Pyrolysis process of holocellulose under 100-370 ℃, in which 41%-51% of its original mass losses. In terms of the mean pyrolysis rate of holocellulose, Aquilegia vulgaris burns most severely for flammable combustion. 3) Decomposition of lignin,which occurs under 370-500 ℃ and losses 31%-37% of the mass. Artemisia stolonifera and Filipendula palmata burns most severely in smoldering phase evaluated by the mean decomposition rate of lignin.

Key words: herbaceous, pyrolysis, fuel, thermogravimetric analysis, flammability