A TFM-KTGF jetting fluidized bed coal gasification model and its validations with data of a bench-scale gasifier

A comprehensive TFM-KTGF simulation was performed with a bench-scale jetting fluidized bed coal gasifier. The numerical results were carefully processed and several key gas–solid hydrodynamic properties, such as the jet height, the bubble size and the amount of solids entrained from the annulus to the jet were validated against literature correlations. The simulated distributions of the bed temperatures, and the gas species compositions (CO, CO2, H2) were validated with reported experiment data (Bi and Kojima, 1996), and compared with those obtained from the TFM-CVM modeling (Gao et al., 2006) as well. It was found that the TFM-KTGF simulation results agreed with the experiment data better than the TFM-CVM, confirming that the TFM-KTGF model could improve the descriptions of gas–solid hydrodynamics of the jetting fluidized bed. The simulation results also showed a high temperature zone in the jet region due to intense char-O2 combustion, whereas the char-H2O, char-CO2 and water gas shift reactions mainly occurred in the annular region, reinforcing the importance of accurately defining and monitoring the jet temperature for an industrial jetting fluidized bed gaisifer.

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