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首页> 外文期刊>Particulate Science and Technology: An International Journal >Investigating Straight-Pipe Pneumatic Conveying Characteristics for Fluidized Dense-Phase Pneumatic Conveying
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Investigating Straight-Pipe Pneumatic Conveying Characteristics for Fluidized Dense-Phase Pneumatic Conveying

机译：研究流化密相气力输送的直管气力输送特性

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This article presents results from an investigation into the pneumatic conveying characteristics (PCC) for horizontal straight-pipe sections for fluidized dense-phase pneumatic conveying of powders. Two fine powders (median particle diameter: 30 and 55 jim; particle density: 2300 and 1600kgm~(-3); loose-poured bulk density: 700 and 620kgm~(-3)) were conveyed through 69mm I.D. X 168m, 69 mm I.D. x 148 m, 105mm I.D. x 168m and 69mm I.D. x 554m pipelines for a wide range of air and solids flow rates. Straight-pipe pneumatic conveying characteristics obtained from two sets of pressure tappings installed at two different locations in each pipeline have shown that the trends and relatively magnitudes of the pressure drops can be significantly different depending on product, pipeline diameter and length and location of tapping point in the pipeline (indicating a possible change in transport mechanism along the flow direction). The corresponding models for solids friction factor were also found to be different. There was no distinct pressure minimum curve (PMC) in any of the straight-pipe PCC, indicating a gradual change in flow transition (change in flow mechanism from dense to dilute phase). For total pipeline conveying characteristics, the shapes of the PCC curves and the location of the PMC were found to be significantly influenced by pipeline layout (e.g., location and number of bends) and not entirely by the dense-to-dilute-phase transition of flow mechanism. Seven existing models and a new empirically developed model for PMC for straight pipes have been evaluated against experimental data.
机译：本文介绍了对用于粉末的流化密相气动输送的水平直管段的气动输送特性（PCC）的研究结果。将两种细粉（中值粒径：30和55吉姆;颗粒密度：2300和1600kgm〜（-3）;松散堆积密度：700和620kgm〜（-3））通过69mm I.D. X 168m，内径69 mm x 148 m，内径105mm x 168m和69mm内径x 554m管道，适用于各种空气和固体流速。从在每条管道的两个不同位置安装的两组压力接头获得的直管气动输送特性表明，压降的趋势和相对大小可能会根据产品，管道直径以及接头点的长度和位置而显着不同。在管道中（指示沿流动方向的传输机制可能发生变化）。还发现相应的固体摩擦系数模型是不同的。在任何直管PCC中都没有明显的最小压力曲线（PMC），表明流动过渡逐渐改变（流动机理从密相到稀相的变化）。对于总的管道输送特性，发现PCC曲线的形状和PMC的位置受管道布局（例如，弯头的位置和数量）的影响很大，而不是完全受管道的致密相到稀相过渡的影响。流机制。已针对实验数据评估了7种现有模型和经验开发的直管PMC新模型。

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