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Modelling of an entrained flow coal gasifier. 2. Effect of operating conditions on reactor performance

Vamvouka Despoina, Woodburn Edward T., Senior Peter R.

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Περίληψη

The entrained flow gasification model developed in Part 1 was used for parametric studies to provide a better understanding of the reactor performance in terms of coal conversion, product gas composition, calorific value and temperature profiles throughout the reactor under various operating conditions (feed flow rate, particle size and system pressure). The results suggest that the critical parameters in gasification are the steam-to-coal and oxygen-to-coal feed ratios and the gasifier pressure. The maximum reactor temperature could be controlled by the concentration of steam in the feed, but its location was strongly dependent on pressure. In terms of throughput and calorific value of product gas, the performance of the gasifier would be improved with lower steam and oxygen feed rates and higher system pressure; in terms of conversion, it would be improved with higher system pressure. No experiments were performed to verify the simulation, but the results are consistent with those of previous investigations.

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