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Questions and Answers
True or false: The coefficient of explosivity (Kex) is only related to the concentration of coal dust in the air.
True or false: The coefficient of explosivity (Kex) is only related to the concentration of coal dust in the air.
False (B)
True or false: Coal dust with low volatile matter content is more explosive than high volatile matter content.
True or false: Coal dust with low volatile matter content is more explosive than high volatile matter content.
False (B)
True or false: Coal dust explosions can only be prevented through proper ventilation and dust control measures.
True or false: Coal dust explosions can only be prevented through proper ventilation and dust control measures.
False (B)
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Study Notes
- Explosivity of coal dust depends on particle size, concentration, composition, incombustible dust and gases, and ignition temperature.
- Smaller particle sizes have higher surface areas and are easily ignited when airborne.
- A concentration of 30-2000 g/m3 can cause an explosion, with 112-350 g/m3 giving the maximum effect.
- Coal dust with high volatile matter content is more explosive than low volatile matter content.
- Coefficient of Explosivity (Kex) is related to Volatile Matter (VM) content of coal: Kex = 4.2VM + 3.
- Presence of incombustible dust and gases affects explosivity.
- Ignition temperature is also a factor in explosivity.
- Coal dust explosions can be prevented through proper ventilation and dust control measures.
- Coal mining and handling industries are at risk of coal dust explosions.
- Proper safety measures and training are necessary to prevent coal dust explosions.
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