experimental and modelling study

Abstract- The gasification of two high-ash South African coals were studied using a pilot- scale bubbling fluidised bed coal gasifier operated at atmospheric pressure with oxygen enriched air and steam as the gasification agents. Tests were carried out at temperatures between 875 and 975 °C and char residence times of between 15 and 55 minutes in the gasifier. The results of the test show that the fixed carbon conversion increases with an increase in temperature and residence time of char particles in the gasifier. The experimental results were used to calibrate a commercially available fluidised bed gasifier simulation model (CeSFaMB). The predictive capability of the model was analysed in terms of the degree of variation between experimental and simulated results for each test. The calibrated model was used to design a 15 MW fluidised bed coal gasifier