A clean producer gas was obtained with a novel downdraft
gasifier. A modified combustion chamber that prevents theformation of cool zones inside it and increases the thermal ho
mogenization in this reaction zone was developed. This modifica
tion 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