A dynamic model for predicting tar content in gases from a stratified downdraft gasifier: Part ii -model sensitivity analysis

Abstract

An analysis was carried out to determine the sensitivity of a dynamic model developed for a stratified downdraft wood gasifier to changes in input parameter values. The sensitivity of the model to small increments and decrements in three operating parameters and eight model parameters was investigated. The results show that a higher air supply rate increases the combustion zone temperature and reduces outlet tar levels. Changes of ±20% in air supply rate, initial particle diameter and solid-to-gas heat transfer coefficient led to changes in predicted reaction zone velocity of more than 50%. The final mass of condensable tars in the producer gas was predicted to change by more than 300% as a ..