Numerical investigation of flow stratification behavior of binary particle mixture for high-temperature flue gas filtration on an inclined moving bed
Numerical investigation of flow stratification behavior of binary particle mixture for high-temperature flue gas filtration on an inclined moving bed
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DOI：
10.1016/j.powtec.2020.12.059
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发表时间：
2021-04
影响因子：
5.2
通讯作者：
Mengyao Shen;Lige Tong;H. Ding;Li Wang;Yulong Ding
中科院分区：
文献类型：
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作者：
Mengyao Shen;Lige Tong;H. Ding;Li Wang;Yulong Ding
虽然由于在颗粒床中使用小尺寸颗粒可以提高过滤效率，但是床压降可能增加。这项研究提出了一个数值解的移动床，可以促进瞬时分离的二元颗粒成一个较大的颗粒的顶层和底层的较小的颗粒在流动过程中。采用颗粒离散元法对双元颗粒的流动过程进行了数值模拟，并通过实验进行了验证。提出了一个衡量分层效果的指标和分离度。结果表明，粒径比和粗颗粒质量分数越大，粒径分布越均匀。粗颗粒层的厚度随着质量分数的增加而增加。当粗颗粒的质量分数为65%，粒径比为2.5时，表面厚度和偏析均在最佳范围内。
Although the filtration efficiency can be increased because of the use of small-sized particles in granular beds, the bed pressure drop may be increased. This study presents a numerical solution of a moving bed that can facilitate instantaneous separation of binary particles into a top layer of larger particles and a bottom layer of smaller particles during the flow. The particle discrete element method is used to simulate the flow process of binary particles, which is verified by experiments. An index to measure the effect of stratification and the separation degree (SD) are proposed. Results show that SD increases as the particle size ratio and the mass fraction of coarse particles increases. The thickness of the coarse particle layer increases as the mass fraction increases. The surface thickness and segregation are within the optimum when the particle size ratio is 2.5 and the mass fraction of coarse particles is 65%.