DOIAbstract
Aiming at improving the design of wood pellet stoves and boilers, we developed original experiments to study chemical and physical processes occurring in a single pellet. We investigated medium temperature (<550 °C) and low air flowrate, where smouldering prevails. Two setups have been used, allowing to monitor the pellet weight loss, internal temperature, and the exhaust gas composition (H2, CO, CO2, O2, VOC), and modify the temperature and composition of the environment surrounding the pellet and its size. The study allowed to identify the sequence of phases involving drying, pyrolysis, partial and total oxidation of volatiles and char. The maximum rate of conversion is controlled by heat conduction, in the gas surrounding the solids and ...
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