The combustion behaviours of three components, namely hemicellulose, cellulose, and lignin, and four types of biomass, namely rice straw, bamboo, peanut shell, and chestnut shell, were examined in a drop tube furnace set at 1273 K, in O2/N2 atmospheres containing 21-100% O2. Radiant energy analysis technology was employed to infer the temperatures of the samples. The results show that the ignition mechanisms of cellulose and hemicellulose change at 30% and 70% O2, respectively, and the lignin particle ignites homogeneously at 20-30% O2, heterogeneously at 50% O2, and hetero-homogeneously at 70-100% O2, respectively. The changes in the ignition mechanisms of biomass particles with lignin content > 10% and < 10% under a certain oxygen concentration depend considerably on the lignin and cellulose contents in the biomass particle, respectively. The expansion of biomass particles with lignin content > 10% and < 10% during combustion process are caused by lignin and hemicellulose, respectively.
Keywords: Biomass; Cellulose/Hemicellulose/Lignin; Ignition behaviour; Oxygen concentration.
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