Abstract
Thermal conduction and gas generation undergoing pyrolysis in a packed bed of biomass has been studied experimentally and numerically. The average gas temperature in the packed bed was a suddenly increased with time at 500 K < T_G < 800 K. If the particle diameter increased, the suddenly increment of gas temperature was more remarkable. The time course of the average gas temperature could be partly reproduced by the numerical simulation with including the change of the porosity except for the suddenly increment of gas temperature. Mass flow rate of generated gas has a maximum at a certain time due to the secondary decomposition of tar. It was found that the calculated gas flow rate with the effect of temperature distribution in the packed bed agreed with the experimental one except for the gas flow rate due to the tar decomposition.
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