A powder inerting unit is a key piece of equipment used for industrial dust explosion protection and process safety, by injecting inert powder or gas into a flammable and explosive atmosphere, reducing the dust concentration or oxygen content, thereby reducing the risk of combustion and explosion. Here's how to explain it in conjunction with the search results:

1. Core functions and principles

1. Inerting explosion-proof mechanism

   • Destroy explosion conditions by injecting inert materials (e.g., calcium carbonate, talc) or gases (e.g., N₂, CO₂) into equipment (e.g., dust collectors, silos) to dilute the concentration of combustible dust or reduce oxygen content.
   • Two types of inerting:
     • Gas inerting: If nitrogen is filled, it needs to be equipped with an oxygen concentration monitoring device, which will trigger an alarm and interlock shutdown when the standard is exceeded.
     • Powder inerting: Inert powder is injected to ensure that the dust concentration is less than 50% of the lower explosion limit.

2. Explosion suppression function

   • When a risk of explosion (e.g., sudden pressure rise, excessive oxygen concentration) is detected, the powder spraying system is triggered to quickly release the inert powder and inhibit the spread of the explosion.

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