If materials stick together in pneumatic conveying, it may cause blockage, so static electricity in pneumatic conveying should be given special attention.

1、 Mechanism of static electricity generation

The mechanism of static electricity generation is based on the phenomenon of excess positive or negative charges on objects, and the excess charge is called static electricity. Static electricity is mainly caused by the contact or separation of two objects.

Accumulate, move, and even disappear according to the conductivity of the object. Generally, the conductivity is below 10^-8The insulator of s/m will be charged. For conductivity higher than 10^-6Objects with s/m need to be grounded to prevent them from being charged.The conductivity of some substances is shown in Table 1.

Table 1

With the occurrence of static electricity, charged phenomena occur on objects. The specific charged phenomena have the following main categories: ① frictional charging. ② Peel off the charged material. ③ Spray charged. ④ Charged impact. ⑤ Destroy (crush) the charged material.