Simulation of flow structure in spray tower based on structural drag model

doi:10.16085/j.issn.1000-6613.2020-0053

Abstract

Abstract:

The spray towers in wet desulfurization, composed of multi-scale structures, are complex system, where the mesoscopic structure has great influence on the mass transfer between droplets and flue gas. Based on the internal structure of the spray tower, a drag force model based on the mesoscopic structure is established in this paper. Then, the model is coupled to a two-fluid model to simulate and predict the flow structure of flue gas and liquid droplets inside the spray tower. In the simulation results, through the analysis and comparison of the two-dimensional and three-dimensional pressure drop, velocity, and droplet distribution, it could be found that the simulation results predicted the flow structure of the flue gas and droplets in the absorption tower accurately, which fully explained the drag model based on the mesoscopic structure can reflect the force between the droplet and the flue gas well.

Key words: mesoscopic, structure, spraying-towers, desulfurization, flue gas, drag

摘要：

湿法脱硫系统中的吸收塔为多尺度结构构成的复杂系统，其中介观结构对液滴和烟气在塔内流动有重要影响。而液滴和烟气的流动状况直接关系着脱硫系统的脱硫效率及运行阻力。本文基于吸收塔内部结构，建立基于介观结构的曳力模型，并将该模型耦合到多相流模型中，结合商业软件Fluent对吸收塔内部烟气和液滴流动状况进行模拟预测。在模拟结果中，通过对吸收塔二维、三维的压降、速度和液滴分布的模拟计算结果分析和对比，表明模拟结果准确预测了烟气和液滴在吸收塔内流动结构，充分说明了基于介观结构的曳力模型可以很好反映液滴和烟气之间的作用力。

关键词: 介尺度, 结构, 吸收塔, 脱硫, 烟气, 曳力

CLC Number:

TQ 530

Xiaolin LÜ, Yuannan XIONG, Yongwei WANG, Xiaoxiang ZHOU, Yonglin XIANG. Simulation of flow structure in spray tower based on structural drag model[J]. Chemical Industry and Engineering Progress, 2020, 39(S1): 50-54.

吕小林, 熊远南, 汪永威, 周晓湘, 向勇林. 基于结构曳力的吸收塔内部气液流动模拟[J]. 化工进展, 2020, 39(S1): 50-54.

Figures/Tables 9

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