The Investigation of Wetting and Agglomerating Mechanism of Short-Chain Fluorocarbon Surfactant Suppressing Coal Dust from Macro and Molecular Scales

作者：Xuhan Ding, Kai Wang, Zhenmin Luo, Qingyun Fu, Tianting Wang, Qian Xu, Xin Yi, Renkun Dai, Haipeng Jiang, Zhenqiang Xing · 发表于：Chemical Engineering Journal · 年份：2024 · DOI：10.1016/j.cej.2024.150475 · 被引用次数：79 · 研究领域：Aerosol Filtration and Electrostatic Precipitation、Coal Properties and Utilization、Particle Dynamics in Fluid Flows

This paper carried out a multi-scale investigation on the wetting and agglomerating mechanism of short-chain fluorocarbon surfactant suppressing coal dust. As investigated, FS-50 achieves higher dedusting rate and shorter suppression time than FS-3100, which is attributed to its better wettability and more sufficient agglomeration on coal particles. Simulation indicates that FS-3100 with longer chain length is easier to generate chemical bond rotation, which results in a distorted spatial structure, higher steric hindrance, and poorer ability of FS-3100 in retaining H 2 O molecules and adsorbing surround the coal particles. The hydrophilic group of FS-50 is dominated by the induced effect and presenting larger charge density and electron-absorbing nature. Higher electrostatic potential difference with coal molecules, more hydrogen bonds , shorter bond length and larger bond angle are key factors to endorse FS-50 a better wetting and agglomerating performance. The C atom connected with the fluorocarbon tail chain of FS-3100 is linked to a carboxyl group with lone pair electrons. This carboxyl group enlarges the LUMO value of FS-3100 and weaken its ability to attract the electrons of coal particles. On the contrary, the lower LUMO value, lower band gap energy, and smoother spatial configuration jointly bring FS-50 better wetting and agglomerating ability.