Experimental study on motion and combustion of particle group in entrainment region toward entrained-flow gasification

Abstract

The motion and combustion behaviors of the particle in the entrainment region are investigated with the bench-scale impinging entrained-flow coal-water slurry (CWS) gasification experimental platform and the advanced visualization system. The speed and size distribution of particle group, and the dynamic evolution of volatile flame are analyzed through the algorithmic and refinement processing of the image sequence. The particles moving at low speed (0–1 m/s) account for the largest proportion. The increasing oxygen flow rate declines the proportion of the particles moving at with low speed, while the average speed of particle group increases. The Sauter mean diameter (SMD) of the particles shows an overall increasing trend under different operating conditions. The flame shape of the particles undergoing volatile combustion changes dynamically over time in aspects of flame area and flame orientation. The more injection amount of oxygen flow results in the greater the proportion of particles undergoes volatile combustion.