粒度和温度对低阶煤孔隙结构的影响,ACS Omega

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粒度和温度对低阶煤孔隙结构的影响
ACS Omega ( IF 3.7 ) Pub Date : 2021-02-19 , DOI: 10.1021/acsomega.0c06280
Teng Li _{1,

2} , Jian-jun Wu ₃ , Xing-gang Wang ₄ , Hai Huang ₁

Affiliation

高水分含量和高挥发性含量是低阶煤的典型特征。为了准确获得低阶煤的孔隙结构特征，粒径和预处理温度是使用低压液氮吸附时应考虑的两个关键参数。在这项研究中，从鄂尔多斯盆地收集了一个低品位煤样品，并将其抛光成四种不同的颗粒大小，分别为40-80目，80-120目，120-160目和160-200目。此外，低阶煤样品要在七个不同的预处理温度（120至300°C）下进行处理。然后，获得了不同粒度和预处理温度下低阶煤的孔隙结构特征。低阶煤的孔隙体积和孔隙比表面积的动态变化是一致的。在相同的预处理温度下，中孔的体积不断减小。当预处理温度达到300°C时，观察到其体积微弱增加。这些结果意味着中孔在逐步粉碎和加热过程中被损坏。当具有相同的粒径时，中孔的体积也随着预处理温度的升高而减小。相反，大孔体积是稳定的。这主要是由于在较高的预处理温度下挥发性物质的分解和中孔的破裂。但是，中孔中灰分的富集可以维持煤骨架。

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Particle Size Effect and Temperature Effect on the Pore Structure of Low-Rank Coal

High moisture content and high volatile content are typical characteristics of low-rank coal. To acquire the pore structure characteristics of low-rank coal accurately, the particle sizes and the pretreatment temperatures are two key parameters that should be considered when the low-pressure liquid-nitrogen adsorption is used. In this study, a low-rank coal sample was collected from Ordos Basin, and it was polished into four different particle sizes, 40–80 mesh, 80–120 mesh, 120–160 mesh, and 160–200 mesh, respectively. Besides, the low-rank coal samples are handled under seven various pretreatment temperatures (ranging from 120 to 300 °C); then, the pore structure characteristics of low-rank coal under various particle sizes and pretreatment temperatures are acquired. The dynamic change of pore volume and pore-specific surface area for low-rank coal is coincident. Under the same pretreatment temperatures, the mesopores’ volume continuously decreases. When the pretreatment temperature reaches 300 °C, a faint increase in their volume is observed. These results mean the mesopores are damaged during the progressive pulverization and heating procedures. When it comes to the same particle sizes, the mesopores’ volume also decreased with the increased pretreatment temperatures. Contrarily, the macropore volume is stable. This is mainly due to the decomposition of volatile matters and collapse of mesopores under the high pretreatment temperatures. However, the enrichment of ash in the mesopores could maintain the coal skeleton. The particle size effect and temperature effect mainly relate to the mesopores in low-rank coal, and the pores with the aperture below 5 nm contribute predominantly, followed by the pores with the aperture ranging from 5 to 10 nm.

更新日期：2021-03-02

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