Abstract:

According to the flow field of opposed multi-burner gasifier, the gasifier was divided into several regions.The particle residence time distribution (RTD) in the gasifier was investigated with a stochastic model based on discrete time and state Markov chain.The results showed that the calculated results could give a reasonable fit to the experimental data when reflux ratio between jet stream region and impinging region was 0.5, the tube stream region and the downward impinging-stream region were regarded as plug flow reactor (PFR), others were considered as continuous stirred tank reactor (CSTR).Mean residence time and dimensionless variance decreased with the increase of flow rate, while mean residence time increased with the increase of reflux ratio.Mean residence time was similar between gaseous phase and solid phase.