挡板构型对含钒页岩浸出槽内多相流行为的影响

doi:10.16085/j.issn.1000-6613.2023-1125

摘要/Abstract

摘要：

搅拌浸出槽是石煤提钒浸出过程中的关键设备，搅拌槽的结构优化对提高固液悬浮性能具有重要意义。本文对不同构型挡板的某厂含钒页岩搅拌槽进行数值模拟，通过比照搅拌槽流场与相分布、死区分布等模拟结果，剖析不同构型挡板对含钒页岩搅拌槽内固液两相流的影响。结果表明：安装挡板对搅拌过程中钒页岩颗粒充分扩散有利。分段挡板条件下整体流速约为0.65m/s，相较于标准挡板更快，增幅约为15.00%。分段挡板与标准挡板对钒页岩颗粒在搅拌槽内的扩散优化效果相似，两种挡板均能缩小钒页岩颗粒的死区区域，其中标准挡板低浓度区域减少约99.14%，分段挡板沉积区域减少约91.21%。此外，分段挡板相较于标准挡板能够节省20.00%的搅拌功率。分段挡板在能获得与标准挡板相同搅拌效果的同时更加节能，具有较高的应用推广价值。

关键词: 浸出槽, 挡板, 计算流体力学, 混合, 数值模拟

Abstract:

Stirring leaching tank is the key equipment in vanadium extraction process of stone coal. The structure optimization of stirring tank is of great significance to improve solid-liquid suspension performance. The numerical simulation of vanadium shale mixing tanks with different configuration baffles was carried out to analyze the influence of different baffles on the solid-liquid two-phase flow in vanadium shale mixing tanks by comparing the flow field, phase distribution, dead zone distribution and other simulation results. The results showed that the installation of baffle was beneficial to the full diffusion of vanadium shale particles during agitation. The overall flow rate of the segmented baffle was about 0.65m/s, which was faster than that of the standard baffle, and the increase rate is about 15.00%. The optimized effect of the segmented baffle was similar to that of the standard baffle on the diffusion of vanadium shale particles in the mixing tank. Both baffles can reduce the dead zone of vanadium shale particles, in which the low concentration area of the standard baffle was reduced by about 99.14%, and the deposition area of the segmented baffle was reduced by about 91.21%. In addition, the segmented baffle can save 20.00% stirring power compared to the standard baffle. The segmented baffle can obtain the same stirring effect as the standard baffle. At the same time, it is more energy saving and had higher application and popularization value.

Key words: leaching tank, baffle, computational fluid dynamics, mixing, numerical simulation

中图分类号:

TF841.3

李京, 方庆, 周文浩, 吴国良, 王家辉, 张华, 倪红卫. 挡板构型对含钒页岩浸出槽内多相流行为的影响[J]. 化工进展, 2024, 43(2): 619-627.

LI Jing, FANG Qing, ZHOU Wenhao, WU Guoliang, WANG Jiahui, ZHANG Hua, NI Hongwei. Effect of baffle configuration on the multiphase flow behaviors of vanadium shale leaching tank[J]. Chemical Industry and Engineering Progress, 2024, 43(2): 619-627.

图/表 14

图1 搅拌槽挡板三种方案

图2 搅拌槽网格划分(a)与桨叶区域网格划分(b)

图3 测量位置示意图(a)及网格无关性验证(b)

图4 实验设备及材料(a)与数据对比图(b)

图5 搅拌浸出槽方案Ⅰ(a)、方案Ⅱ(b)和方案Ⅲ(c)钒页岩速度云图

图6 搅拌浸出槽方案Ⅰ、方案Ⅱ、方案Ⅲ钒页岩速度统计分布

图7 搅拌浸出槽内方案Ⅰ(a)、方案Ⅱ(b)和方案Ⅲ(c)的钒页岩浓度云图

图8 搅拌浸出槽内方案Ⅰ、方案Ⅱ和方案Ⅲ的钒页岩体积分数统计分布

图9 搅拌浸出槽内方案Ⅰ(a)、方案Ⅱ(b)和方案Ⅲ(c)的钒页岩浓度分布

图10 搅拌浸出槽内方案Ⅰ(a)、方案Ⅱ(b)和方案Ⅲ(c)速度面

图11 搅拌浸出槽测量点位分布

图12 方案Ⅰ、方案Ⅱ和方案Ⅲ在不同测点的钒页岩浓度分布曲线

图13 不同方案搅拌功率对比

图14 相同功率下方案Ⅱ(a)和方案Ⅲ(b)的钒页岩浓度分布

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