Dust explosion means that when the dust meets a heat source (open flame or temperature) within the explosion limit, the flame instantly spreads throughout the mixed dust space, and the chemical reaction speed is extremely fast, at the same time, a large amount of heat is released, resulting in high temperature and great pressure. The energy of the system is converted into mechanical work and radiation of light and heat, which has strong destructive power.

Explosive dust explosive dust includes: metals (such as magnesium powder and aluminum powder); Coal; Grain (such as wheat and starch); Feed (such as blood meal and fish meal); Agricultural and sideline products (such as cotton and tobacco); Forest products (such as paper powder and wood powder); Synthetic materials (such as plastics and dyes).

Usually, dust that is not easy to cause explosion includes soil, sand, iron oxide, grinding materials, cement, Shi Ying dust and dust similar to that after combustion. The dust chemical properties of this kind of substance are relatively stable, so it is not easy to burn. However, if this kind of dust is produced in oil mist and combustible gases such as CO, CH4 and coal gas, it is also prone to explosion.

prevent

If effective ventilation and biological nano-film dust suppression technology and other comprehensive dust suppression measures are adopted, smoking and open flame operation are strictly prohibited. Set pressure relief valve or other devices in the equipment shell, and adopt explosion containment system. The workshop with the risk of dust explosion must be designed in strict accordance with the explosion-proof technical level, and a separate ventilation and dust exhaust system should be set up. Always wet clean the workshop floor and equipment to prevent dust from flying and gathering. Ensure that the system is well sealed. If necessary, the flammable dust in the closed container or pipeline is filled with nitrogen, carbon dioxide and other gases to reduce the oxygen content and inhibit the explosion of dust.