In-situ test study and suppression strategy of dust charging behavior in airflow-driven GS-TENG

As modern industry evolves, powder technology has become widely used across numerous sectors. However,
such extensive utilization has augmented the risk of dust explosions due to electrostatic charges during the
production processes. The tiny size of dust particles, along with their tendency to gather static electricity during
transportation in pipelines, poses a significant challenge for both observation and analysis. Furthermore, the
electrostatic charging mechanisms of dust particles are still not well understood, highlighting the urgent need to
clarify how electrification occurs to effectively mitigate electrostatic issues with dust. In this paper, a continuous
gas-solid two-phase flow triboelectric nanogenerator (GS-TENG) has been developed to explore the generation
mechanism of triboelectrification when flour-air two-phase flow collides with pipeline wall. Furthermore, to
comprehensively analyze the relationship between flour movement in the pipeline under the influence of airflow
and frictional electric signals, high-speed cameras were employed to record flour motion throughout the process.
The findings indicate that flour-air two-phase flow exhibits unidirectional frictional electric signals after friction
within PTFE pipelines. The findings reveal that the flow of flour driven by airflow through PTFE pipes produces
frictional charges, leading to the formation of charged clusters. Upon contact with a grounded copper mesh,
electric current peaks of up to 150 μA can be observed. Since the frictional charges carried by flour primarily
originate from wall friction, coating the inner walls of pipelines with silicon-modified acrylic resin significantly
reduces the frictional charges carried by flour, effectively suppressing static electricity accumulation and
discharge phenomena, thus enhancing the safety of dust transportation. This study offers novel strategies for
harnessing frictional electricity in gas-solid two-phase flows and mitigating electrostatics.

随着现代工业的发展，粉体技术已在众多行业得到广泛应用。然而，这种大规模的应用却增加了生产过程中因静电引发粉尘爆炸的风险。粉尘颗粒尺寸微小，且在管道输送过程中易积聚静电，这给观测与分析带来了极大挑战。此外，学界对粉尘颗粒的静电起电机理仍未完全明晰，因此迫切需要阐明其带电过程，以有效应对粉尘静电问题。本文研制了一种连续式气固两相流摩擦纳米发电机（gas-solid two-phase flow triboelectric nanogenerator，GS-TENG），用于探究面粉-空气两相流与管道壁面碰撞时的摩擦起电机理。此外，为全面分析气流影响下管道内面粉运动与摩擦电信号之间的关联，本研究采用高速摄像机记录了全过程中的面粉运动情况。研究结果表明，面粉-空气两相流在聚四氟乙烯（PTFE）管道内发生摩擦后，会产生单向摩擦电信号。研究发现，气流驱动面粉流经聚四氟乙烯管道时会产生摩擦电荷，进而形成带电团簇。当带电团簇与接地铜网接触时，可观测到峰值高达150μA的电流。由于面粉携带的摩擦电荷主要源自管壁摩擦，因此在管道内壁涂覆硅改性丙烯酸树脂可显著降低面粉携带的摩擦电荷，有效抑制静电积聚与放电现象，从而提升粉尘输送的安全性。本研究为气固两相流中的摩擦电能利用以及静电防护提供了全新策略。