A dynamic model for predicting tar content in gases from a stratified downdraft gasifier: Part III-experimental validation

Abstract

A pilot-scale downdraft gasifier was designed, fabricated and tested. The experimental data obtained from it were compared with the predictions of a dynamic model the development and analysis of which are described in previous papers [1 & 2]. River red gum (Eucalyptus camaldulensis) wood blocks of two different sizes were used as gasifier feedstock. The gasifier was operated at inlet airflow rates of 7.5 to 27.6 kg/hr, with corresponding energy outputs ranging from 54 to 168 MJ/hr. An average cold gas efficiency of 70% was obtained. Two modes of operation were used. In the first mode, the section of the gasifier below the ignition port was filled with charcoal prior to start up and the remai..