Material
When the airflow in the pipeline conveys dust, the amount of static electricity generated is very small when the dust and the pipeline material are the same. When the pipeline is made of metal material, the amount of static electricity generated has little to do with the type of metal material. When the pipeline and dust are both made of insulating materials, the material properties have a significant impact on static electricity. It can even change the sign of the static electricity charge.
Time
The longer the dust is conveyed in the pipeline, the more collisions there are between the dust particles and the wall as a whole. For each particle, the number of friction and collisions increases, and the amount of static electricity on its surface also increases. But at the same time, it also increases the discharge opportunities of charged particles. So the final result is that the static electricity charge tends to balance. That is, at the beginning, as the conveying time increases, the amount of static electricity generated also increases. But after a period of time, it gradually tends to saturation.
Movement speed
The movement speed refers to the dust conveying speed. The higher the speed, the more intense the friction and collision of the particles, and the more static electricity is generated. However, the time required to reach saturation is greatly reduced. In the process of air flow conveying, if the air flow velocity is as high as several meters per second to tens of meters per second, the electrostatic saturation state can be reached quickly.
Load
The load refers to the mass of dust contained in each cubic meter of air flow in air flow conveying. Since the larger the load, the more particles there are, the less chance each particle will have to rub and collide with the pipe wall in the pipe. Therefore, the average charge on the particles or the charge per unit mass of dust decreases with the increase of the load.
Dust particle size
Although from the perspective of a single particle, large particles are more charged than small particles. But from the overall perspective, under the condition of constant mass, the smaller the dust particles, the larger the total surface area of the dust particles. Therefore, the more charge they carry.