Numerical simulation of gas penetration and powder compression during high-pressure dynamic load in silo

IF 2.4 3区工程技术 Granular Matter Pub Date : 2024-10-17 DOI:10.1007/s10035-024-01471-x

Minghao You, Xin Wang, Xiaofei Mao, Xuanyi Liu, Xuewen Zeng, Cai Liang, Jiliang Ma, Xiaoping Chen

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Abstract

The powder consolidation and equipment damage caused by frequent pressurization of the lock hopper silo seriously affect stable powder discharge and transportation. This paper investigated the powder compression and gas permeation characteristics during the silo pressurization by experiment and simulation. The spherical glass powder and irregularly shaped coal powder were selected as the granular materials. The modified drag model agrees well with the experiments for spatial pressure cumulative distribution and full-process pressure drop. The coal powder has a higher average compression ratio than the glass powder. The local porosity of the powder layer experiences two stages of rapid decrease and slow stabilization. The powder compression arises from particle rearrangement and bed pore structure reconstruction under airflow disturbance. The nonlinear growth of pressure accumulation curves at different spatial points in the early stage of silo pressurization forms a fusiform envelope surface. As the average pressure-increasing rate increases, the peak gas pressure gradient of the powder layer increases approximately linearly. The penetration time difference of glass powder between powder layers I and V is less than 1 s, while that of coal powder is close to 4 s. There was a significant time hysteresis effect for gas penetration in the coal powder silo.

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筒仓高压动态负载期间气体渗透和粉末压缩的数值模拟

锁斗料仓频繁加压造成的粉末固结和设备损坏严重影响了粉末的稳定卸料和运输。本文通过实验和模拟研究了料仓加压过程中粉末的压缩和气体渗透特性。选取球形玻璃粉和不规则形状煤粉作为颗粒材料。修正的阻力模型在空间压力累积分布和全过程压降方面与实验结果吻合良好。煤粉的平均压缩比高于玻璃粉。粉末层的局部孔隙率经历了快速降低和缓慢稳定两个阶段。粉末压缩源于气流扰动下的颗粒重排和床层孔隙结构重构。在筒仓加压的早期阶段，不同空间点的压力累积曲线的非线性增长形成了一个纺锤形包络面。随着平均压力增加率的增加，粉末层的峰值气体压力梯度近似线性增加。玻璃粉在粉层 I 和 V 之间的渗透时间差小于 1 s，而煤粉的渗透时间差接近 4 s。

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来源期刊

Granular Matter MATERIALS SCIENCE, MULTIDISCIPLINARY-MECHANICS

CiteScore

4.30

自引率

8.30%

发文量

期刊介绍： Although many phenomena observed in granular materials are still not yet fully understood, important contributions have been made to further our understanding using modern tools from statistical mechanics, micro-mechanics, and computational science. These modern tools apply to disordered systems, phase transitions, instabilities or intermittent behavior and the performance of discrete particle simulations. >> Until now, however, many of these results were only to be found scattered throughout the literature. Physicists are often unaware of the theories and results published by engineers or other fields - and vice versa. The journal Granular Matter thus serves as an interdisciplinary platform of communication among researchers of various disciplines who are involved in the basic research on granular media. It helps to establish a common language and gather articles under one single roof that up to now have been spread over many journals in a variety of fields. Notwithstanding, highly applied or technical work is beyond the scope of this journal.