Experimental and Simulation Study of a Fine Slag Entrained Flow Gasifier with Different Burner Structures

The production of fine slag from gasification results in a significant waste of resources and environmental problems. To address this issue, a feasible option is to use fine slag as a feedstock for gasification. This study proposes a new gasifier with burners that are suitable for fine slag gasification. The burner structure was optimized through airflow experiments. This helped to demonstrate the superiority of the novel burner in mixing feedstock and gasification agents. Simulations were then used to verify the gasification performance of this optimized burner. The results of the airflow experiment suggest that the mixed temperature near the outlet of the fine slag burner was relatively high. Furthermore, the mixing distance was short. The simulation results show that the gasification agents from the fine slag burner, convergent burner, and parallel channel burner were all accelerated to approximately 90–94 m/s in 10,000 Nm³/h entrained flow gasifiers. However, the gasification agent and fine slag from the fine slag burner were better mixed due to the deflection angle of the two airflow channels. The highest carbon conversion rate of 80% was achieved when using the fine slag burner. The effective syngas concentration was 62%.