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Ignition temperature of magnesium powder clouds: a theoretical model
Yuan Chunmiao1, Li Chang, Li Gang
1Fire & Explosion Protection Laboratory, Northeastern University, Shenyang 110004, China. yuanchunmiao@mail.neu.edu.cn
Abstract:
Minimum ignition temperature of dust clouds (MIT-DC) is an important consideration when adopting explosion prevention measures. This paper presents a model for determining minimum ignition temperature for a magnesium powder cloud under conditions simulating a Godbert-Greenwald (GG) furnace. The model is based on heterogeneous oxidation of metal particles and Newton's law of motion, while correlating particle size, dust concentration, and dust dispersion pressure with MIT-DC. The model predicted values in close agreement with experimental data and is especially useful in predicting temperature and velocity change as particles pass through the furnace tube.
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