A clean producer gas was obtained with a novel downdraft
gasifier. A modified combustion chamber that prevents the
formation of cool zones inside it and increases the thermal homogenization
in this reaction zone was developed. This modification
together with an extension of the reduction zone allows
diminishing the tar content in the producer gas. The mean values of
this parameter in all the experimental tests were lower than 10 mg/
Nm3
. The low tar and particle content makes the producer gas
obtained in this reactor suitable to the use in cycle Otto engines.