Abstract
To reduce the risk of coal dust deflagration caused by the leakage in the coal gasification process, a semi-closed vertical combustion tube was built with a high speed camera and micro-thermocouples. And the inerting effect of magnesium carbonate hydroxide pentahydrate (MCHP) with different particle sizes was investigated on the coal dust deflagration. The results showed that the initial flame became very faint and the brightness of the flame was greatly weakened after the addition of MCHP powder. And as the inerting ratio increased, both of the flame velocity and temperature decreased. When the particle size of MCHP powder decreased, the flame propagation time extended from 132 to 196, 223, and 228 ms respectively. And the residue analysis revealed that the decomposition of MCHP not only absorbed the highly reactive radicals of combustion, but also formed inert gases and heat-resistant protective film, which greatly reduced the deflagration intensity of coal dust.
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