Dilute pneumatic conveying of a horizontal curved 90° bend with soft fins or dune model
Dilute pneumatic conveying of a horizontal curved 90° bend with soft fins or dune model
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DOI：
10.1016/j.powtec.2014.01.039
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发表时间：
2014-03
影响因子：
5.2
通讯作者：
A. Rinoshika
中科院分区：
文献类型：
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作者：
A. Rinoshika
为了降低压降和输送风速，研究了沙丘模型和软翅片在90°弯曲水平气力输送中的作用。实验测量的压降，输送空气的速度和附加压降。采用高速PIV技术测量了90°弯曲段附近及弯曲段内的颗粒速度分布。测试管道由4.5 m长的水平直的丙烯酸管、弯曲的90°丙烯酸弯曲（平均曲率半径250 mm）和1.5 m长的水平直的丙烯酸管组成，具有80 mm的内径。采用直径为2.3mm的聚乙烯颗粒作为输送物料。表观空气速度在10至14 m/s之间变化，固体质量流速固定在0.45 kg/s。与传统气力输送相比，在较低风速范围内，采用柔性翅片可以降低气力输送的压降、最小压降（MPD）速度和附加压降。软鳍和沙丘模型对MPD速度的降低率分别为4.1%和8.3%。在弯曲上游和弯曲内，采用沙丘模型的颗粒速度明显高于常规气力输送和采用柔性翅片的颗粒速度。而在弯曲下游，软鳍和沙丘模型对颗粒速度的影响基本保持不变。
In order to reduce pressure drop and conveying air velocity, the paper studied the effect of the dune model and soft fins in horizontal pneumatic conveying involving a 90° bend. Experimental measurements were performed in terms of the pressure drop, conveying air velocity and additional pressure drop. The distributions of particle velocity near and in the curved 90° bend were measured by high-speed PIV. The test pipeline consisted of a 4.5 m-long horizontal straight acrylic tube, a curved 90° acrylic bend (mean radius of curvature 250 mm) and a 1.5 m-long horizontal straight acrylic tube, having an inside diameter of 80 mm. The polyethylene particles with diameter of 2.3 mm were used as conveying materials. The superficial air velocity was varied from 10 to 14 m/s, and the solid mass flow rate was fixed at 0.45 kg/s. Comparing with the conventional pneumatic conveying, the pressure drop, the minimum pressure drop (MPD) velocity and additional pressure drop can be reduced by using soft fins in lower air velocity range. The reduction rates of the MPD velocity by using soft fins and dune model were about 4.1% and 8.3%, respectively. At the upstream of bend and in the bend, the particle velocity of using the dune model is evidently higher than that of the conventional pneumatic conveying and using soft fins. However, the effect of soft fins and dune model on the particle velocity is maintained downstream of the bend.