Abstract:

Through building a numerical model for the ignition and combustion of aluminum dust layer bottom board under the heating condition, the ignition combustion law of aluminum dust layer was explored. Meanwhile, combining with the principle of inertia of calcium carbonate, the experiment on the lowest ignition temperature of aluminum dust layer under the inerting condition of calcium carbonate powder was conducted. The results indicate that the ignition of aluminum dust is characterized by high heating temperature and large combustion temperature ,and calcium carbonate can effectively improve the ignition temperature of aluminum dust. Meanwhile, the smaller the particle size is and the greater the concentration of calcium carbonate powder are, the more significant the inerting effect on the aluminum dust layer will be.

Key words: dust explosion, minimum ignition temperature, dust layer, inerting, numerical simulation