撞击气流床气化炉内雾化过程中颗粒运动特性

Particle motion characteristics of atomization process in impinging entrained-flow gasifier

基于实验室规模的撞击气流床气化炉,以水煤浆为原料进行气化实验,采用高温内窥镜及工业相机组成的可视化成像系统,在操作条件下,对水煤浆雾化过程进行拍摄。运用图像处理算法来识别和检测所得图像中的颗粒信息,利用颗粒示踪算法对颗粒进行轨迹测算。对颗粒的平均粒径、速度及角度进行统计分析。结果表明,喷嘴出口射流区内平均粒径主要集中在325~375μm,相较于原煤颗粒较大;大部分颗粒速度集中在1~2m·s^-1且运动过程中速度变化不大;大部分颗粒运动方向不随时间而变化,呈简单直线运动;颗粒轨迹呈现以喷嘴为起始点的扇形射线。

Based on the laboratory scale of the impinging entrained-flow bed gasifier,the coal gas slurry was used as the raw material for gasification experiments.The particle information in images was identified by image postprocessing algorithm and the particle tracking algorithm was used to calculate the particle trajectory.The particle size,particle velocity and particle motion angle were analyzed by statistical method.The results show that the averaged particle size of the jet flow region near the burner tip concentrates at 325-375μm,which is larger than the original coal particles.The velocity of most particles concentrates at 1-2 m·s^-1 and almost keeps constant during the movement.The motion angles of most particles do not change with time,which means the trajectories of most particles show rectilinear motion.The distribution of all particle trajectories shows a fan-shaped ray starting from the burner tip.