Abstract
The thermal decomposition of plants and soil plays an essential role in triggering a wildfire and sustaining the subsequent fire spread. Since plants and soil are in close contact in the field, the thermal decomposition of their mixture may involve chemical interactions of the individual components. In this work, thermogravimetric experiments with two plant fuels, three soil materials, and their six mixtures were conducted under nitrogen and air atmospheres to investigate the thermal decomposition interactions of plant-soil mixtures. The results show that the interactions between plants and soil are closely associated with atmospheric conditions. The effect of interactions in pyrolysis is weaker than that in combustion. The strength of interactions is controlled by soil type in combustion. A method for evaluating the influence of mixing on the kinetic mechanism is proposed. It is suggested that the interactions in the thermal decomposition of mixtures under the air atmosphere lead to variations in the degradation of lignin and biomass char.
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