1. The external heat source enters into the filter cartridge dust collector
The hot spark particles produced by electric welding and gas cutting are sucked into the filter cartridge dust collector, and the temperature can reach several hundred degrees centigrade in an instant. It is easy to ignite the rust dust inside and cause the ignition of the flammable filter cartridge.
2. Rust dust is a secondary flammable solid
The flammability and particle size composition concentration of dust are related to many factors, such as the smaller the particle size, the larger the specific surface area, the greater the possibility of spontaneous combustion.
The dust produced in the production process of shot blasting process is very fine. The main components are iron oxide and dust. If rust dust is used for ignition test. At the same time, with the help of the flow force of the fan, the combustion speed is accelerated. The filter material of the cartridge dust collector is usually polyester fiber, which is flammable.
3. The temperature in the shot peening filter element is very high
During the operation of the system, the temperature will gradually increase, and when it reaches the combustible condition, the oxidation reaction rate of combustible dust will exceed its heat dissipation capacity, leading to dust spontaneous combustion. In high temperature and oxygen rich environment, it is easy to produce a large amount of oxidation heat and continuously accumulate in the dust collector. The finer the dust is, the greater the possibility of spontaneous combustion is.
4. Fire hazard caused by static electricity
Rust dust will produce static electricity in high speed airflow. Friction between dust particles or with objects inside the dust collector will produce thousands of volts of electrostatic potential. It is easy to disperse the dust and increase the friction. When the accumulated potential increases to the breakdown field strength between dust, electrostatic sparks will be generated, and when the discharge energy reaches or exceeds the lower ignition point of rust dust, the possibility of fire accident is very great.
The test shows that the chemical fiber filter material is usually the place where static electricity concentrates. During the use of the system, the dust accumulated on the filter cartridge will increase the strength of the space electric field. When the breakdown field strength between the accumulated dust appears, the electrostatic spark will discharge, and its energy is enough to ignite the rust dust.
5. Unreasonable design
Another reason is that the design of the dust remover of the shot blasting machine is not reasonable, which leads to the fire hazard caused by the mismatch between the filter cartridge dust remover and the shot blasting machine.
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