Analysis of Influence of Nozzle Structure on Flow Field in Pulverized Coal Gasifier

Abstract

Abstract The three-dimensional model of the pulverized coal gasifier was established, and the internal flow field of the pulverized coal gasifier was simulated by CFD software. The variation of the velocity field and vector field inside the gasifier was observed when the angle of the guide vane in the nozzle structure gradually increased. Through the comparative analysis of the simulation results of the angle between the guide vane and the axis of 20°, 30°, 40° and 50°, the following conclusions can be drawn: as the angle of the guide vane increases, the lateral diffusion capacity of the airflow at the nozzle exit increases, and the longitudinal diffusion capability decreases. Therefore, after comprehensive consideration and contact with the actual gasifier size, this paper considers that the angle between the blade and the axis is optimally 40°-45°.