Study On Flammability Of 7 Typical Tree Species In Southern China

The testing of small ground samples has been used to measure pyrolysis characteristics and kinetics parameters of 7 typical tree species fuels in Southern China. The’cone calorimeter’is the bench-scale test method that used to analysis the combustibility of 3 different structures fuels, and burning experiments with surface fuels were conducted inside lab under no wind and zero slope conditions with controlled moisture content, fuel load. Rate of spread, consumptive features, and flame length were measured or deduced form the experiments.The results show that all the 7 fuels lost 79.5%-96.94% of the initial weight in the air atmosphere, holocellulose content (52.75%-58.15%) was more than lignin content (19.31%-36.9%), because of holocellulose of 7fuels were similar, lignin content determines the consumption of pyrolysis process, Phyllostachys heterocycla (Carr.) Mitford cv. Pubescens has lowest lignin content (19.31%) than the other 6 fuels.The results of cone calorimeter was affected by the fuel structure,3 different fuel bed structure test result difference obviously, and use the principal component analysis to evaluate the flammability also has different results, ranking of flammability in 3 different fuel bed structure has no correlation(P>0.05). The correlation of E2 and PHRR was obviously, correlation coefficients was 0.793、0.741、 0.909 with 3 different bed structure, that show there were strong relationship between the intensity and the activation energy of lignin. In addition, TSI and k2、E2、A2;THR and k2 also have relationship obviously (P<0.05)The results of thermogravimetric analysis and cone calorimeter has poor relationship with the results of burning experiments. Analysis results show that correlation between pyrolysis characteristics and consumptive features was stronger than rate of spread and flame length, the correlation between fire behavior and the results of cone calorimeter is poor, yet.