![]() ![]() Primary dust explosions may occur inside process equipment or similar enclosures, and are generally controlled by pressure relief through purpose-built ducting to the external atmosphere. If the spread of flame is at subsonic speed, the phenomenon is sometimes called a " deflagration", although looser usage calls both phenomena " explosions".ĭust explosions may be classified as being either "primary" or "secondary" in nature. The sudden release of energy from a " detonation" can produce a shockwave, either in open air or in a confined space. If rapid combustion occurs in a confined space, enormous overpressures can build up, causing major structural damage and flying debris. These weapons are the most powerful non-nuclear weapons in existence. Thermobaric weapons exploit this principle by rapidly saturating an area with an easily combustible material and then igniting it to produce explosive force. They are also commonly used by special effects artists, filmmakers, and pyrotechnicians, given their spectacular appearance and ability to be safely contained under certain carefully controlled conditions. In cases when fuel plays the role of a combustible material, the explosion is known as a fuel-air explosion.ĭust explosions are a frequent hazard in coal mines, grain elevators and silos, and other industrial environments. ![]() Dust explosions can occur where any dispersed powdered combustible material is present in high-enough concentrations in the atmosphere or other oxidizing gaseous medium, such as pure oxygen. Rapid combustion of fine particles suspended in the air Lab demonstration with burning lycopodium powderĪ dust explosion is the rapid combustion of fine particles suspended in the air within an enclosed location. ![]()
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