Static electricity is a common phenomenon of electrification, under certain conditions, two different substances ( including at least an electrolyte ) contact, friction, may produce electrostatic and accumulate, generating high voltage. If the electrostatic energy to emit sparks form, may be a source of ignition, fire and explosion accidents caused by. In the petrochemical, chemical fiber, plastics, rubber, printing, paper, textile and other manufacturing, processing, storage and transportation of high resistivity material industry may have occurred caused by static electricity fire and explosion.
Two solid relative motion caused by friction, with solid, liquid impurity gas, liquid, powder flow in pipes may be caused by static electricity. Specifically, in the industrial production process, tear, peel, tensile, impact material, crushing, sieving, mixing, transportation, rolling, spraying and filtering material, and gas, liquid flow, splash, spray and other operations, can produce static electricity. In the inflammable and explosive dangerous places, must eliminate electrostatic, to avoid the explosion of a fire. According to the national award of" general guideline for preventing electrostatic", through the following two kinds of measures to eliminate static electricity.
Inhibition of the generation of static electricity
First in the design, manufacturing production equipment, must pay attention to the choice of materials. According to the strip of material with different electrode, can discharge static electricity sequence. In the production system, such as two kinds of mutual contact, friction material, should try to use the static electrification sequence in similar material. Secondly to restrict fluid flow in a pipe flow. Flow more quickly, the more likely they are to produce electrostatic.
Limitations of electrostatic accumulation
To accelerate the process of the resulting electrostatic leakage or neutralize the electrostatic accumulation, limit, so that it does not exceed the safe limit also prevents electrostatic spark.
Equipment, pipeline grounding is the most simple, the most commonly used, but also the most basic electrostatic prevention measures, but it can remove the conductor in the electrostatic, not eliminate static electricity on insulator. In the insulator, conductive fillers or antistatic agent, it can accelerate the electrostatic derived and discharge, avoid the accumulation of static electricity. At the same time can increase the air humidity. When the relative humidity of the air is greater than 70%, the object surface tends to form a thin film of water. Water film can be dissolved carbon dioxide in the air, so that greatly reduces the surface resistivity, accelerating electrostatic dissipation. Best to use electrostatic neutralizer, electrostatic neutralizer to neutralize the object with static electricity, greatly eliminate electrostatic hazards.
