气化炉内气体穿越液池过程中气泡特性的数值模拟

Bubble Characteristics of Syngas During Passing Through Cistern in Gasifier

采用数值模拟方法对含尘气体通过下降管穿越液池过程中的气泡特性进行了研究,展现了该过程中池内气泡生成、破碎和液滴飞溅等一系列行为过程,分析了下降管出口气流速度、静态液位和突扩比等实际操作参数对气泡分布和气液界面面积等气泡特性的影响.结果表明:轴向含气率分布随气流速度的变化存在一个转折点;液面以上空间的含气率随着突扩比的减小而降低,而在液面以下区域,含气率随着突扩比的增大而降低;随着气流速度的增大、静态液位的升高及突扩比的减小,气液界面面积增大.

Bubble characteristics of dusty gas during passing through a cistern via downcomer were numeri- cally studied, including the process of bubble formation, bubble breaking and droplet splashing, etc. , so as to analyze the influence of following factors on the bubble distribution and gas-liquid interface area, such as the gas velocity, static state liquid level and sudden expansion ratio, etc. Results show that the axial distribution of gas holdup has a turning point with the change of gas velocity. The gas holdup drops with the reduction of sudden expansion ratio in the region above liquid level, which, on the contrary, rises un-