Characteristics of fluidization and dry-beneficiation of a wide-size-range medium-solids fluidized bed
Characteristics of fluidization and dry-beneficiation of a wide-size-range medium-solids fluidized bed
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DOI：
10.1016/j.ijmst.2017.03.013
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发表时间：
2017-05
影响因子：
11.8
通讯作者：
L. Tang
中科院分区：
文献类型：
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作者：
L. Tang
在模块化气固流化床煤气化演示系统中，采用了宽粒径范围的中固体颗粒。研究了介质固体的流化特性和干混特性。数值模拟结果表明，0.15-0.06 mm的细磁铁矿粉可以减小气泡对系统的扰动。这有利于气固相互作用的均匀性，从而有利于床层密度和高度的均匀性和稳定性。实验结果表明，随着介质中煤粉含量的增加，流化床的流化质量和流化性能逐渐下降。当煤粉含量不超过13%时，较高的表观气速有利于提高脱硫效率。当其含量大于13%时，部分细粒煤被分离，形成产物层。因此，分离效率逐渐降低。提出了床层密度标准差和概然误差E值的预测模型。在优化的实验参数下，E值可达0.04-0.07 g/cm 3。为模块化40-60吨/小时干法选煤工业系统的床层密度和分选性能的调整提供了依据。
Wide-size-range medium-solids are used in a modularized coal beneficiation demonstration system with a gas-solid fluidized bed. The characteristics of fluidization and dry-beneficiation of the medium solids were studied. The numerical simulation results show that 0.15–0.06 mm fine magnetite powder can decrease the disturbances caused by the bubbles. This is beneficial to the uniformity of the gas-solid interactions and thus to the uniformity and stability of the bed density and height. The experimental results show that, with an increase in the fine coal content in medium solids, both the fluidization quality and the beneficiation performance of the bed decreased gradually. When the fine coal content was no more than 13%, a relatively high superficial gas velocity increased the beneficiation efficiency. When the content was more than 13%, part of the fine coal was separated, leading to product layers. The separation efficiency was therefore gradually decreased. The models for predicting the bed density standard deviation and the probable error,E, value were both proposed. TheEvalue can reach to 0.04–0.07 g/cm3under the optimized experimental parameters. This work provides a foundation for the adjustment of the bed density and the separation performance of the modularized 40–60 ton per hour dry coal-beneficiation industrial system.