Is coal dust a hazardous chemical?
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I have a question for everyone: Coal dust is not listed in the catalog of dangerous goods, but it is a flammable and self-igniting solid. It becomes explosive when the volatile content is greater than 10% ； Explosive coal dust suspensions can form in the air; when their concentration ranges from 40 g/m3 to 2500 g/m3 and the oxygen concentration is above 13%, an explosion will occur upon contact with a fire source (with a minimum ignition temperature of 600–1000°C) or a spark (with a minimum ignition energy of 30 MJ). I don’t understand why coal powder is not considered a hazardous chemical.
Reply 1# sjcw: Not all coal dust can cause a coal dust explosion. It is necessary to determine whether coal dust is explosive through specialized tests! Ordinary coal is only flammable; it is the coal that can catch fire on its own that is dangerous. This can be done by specialized agencies that test the spontaneous ignition tendency of coal.
According to the definition of hazardous chemicals as stipulated in the Regulations on the Management of Hazardous Chemicals, pulverized coal is classified as a flammable solid. So it should be a hazardous chemical.
Thanks for sharing! I have always held different opinions regarding the oxygen content criteria for the powder production unit in fluidized bed gasification furnaces, but I haven’t been able to find any solid data to support them. Could you help me find out: 1) **What are the standards for the explosiveness of coal powder, and which organizations are responsible for conducting such tests?** 2) It would be best if you could provide the contact information of specific experts you are familiar with ； 3) If possible, please provide some materials to study* as well. My contact information: QQ: 391031312