CFD-PBM simulations the effect of aeration rates on hydrodynamics characteristics in a gas-liquid-solid aerobic fluidized bed biofilm reactor

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL Powder Technology Pub Date : 2024-06-06 DOI:10.1016/j.powtec.2024.119963

Jiehui Ren , Yao Pei , Xiaoping Zhou , Meng Jiao , Wen Cheng , Tian Wan

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Abstract

A CFD-PBM coupling model was developed to simulate and calculate multiphase flow parameters, flow morphology, and bubble diameter in the aerobic fluidized bed biofilm reactor (AFBBR) under different aeration rates. The simulated radial solid volume fraction values were generally in agreement (within ±15%) with the experimental values. The gas phase predominantly occupied the central area of the reactor, with three distinct velocity peaks observed in the liquid and solid phases. Higher aeration rates improve the mixing of multiple phases by augmenting fluidization velocity, gas-phase volume fraction, eddies size, and turbulence characteristics, thereby leading to a rise in the average size of bubbles from 1.54 mm to 2.03 mm. However, the proportion of small diameter bubbles (0.27–1.03 mm) decreased from 69.4% to 59.6%. These studies concluded that the multiphase flow parameters under an aeration rate of 5.77 m³/(h·m³) were more favorable for improving oxygen mass transfer efficiency and reducing energy consumption.

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CFD-PBM 模拟曝气速率对气-液-固好氧流化床生物膜反应器流体力学特性的影响

建立了一个 CFD-PBM 耦合模型，用于模拟和计算不同曝气速率下好氧流化床生物膜反应器（AFBBR）中的多相流参数、流动形态和气泡直径。模拟的径向固体体积分数值与实验值基本一致（±15% 以内）。气相主要占据反应器的中心区域，在液相和固相中观察到三个不同的速度峰值。通过提高流化速度、气相体积分数、漩涡大小和湍流特性，较高的曝气速率可改善多相混合，从而使气泡的平均大小从 1.54 毫米增加到 2.03 毫米。然而，小直径气泡（0.27-1.03 毫米）的比例从 69.4% 降至 59.6%。这些研究得出结论，曝气速率为 5.77 立方米/（小时-立方米）时的多相流参数更有利于提高氧气传质效率和降低能耗。

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.

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