Abstract:Impacting air flow produced in ore drawing through a high ore pass is the main reason why ore dumping chamber and adjacent tunnel produce dust. Here, according to the similarity principle, the similarity criteria of impacting air flow produced during unloading ore in a high ore pass were derived by analyzing the basic equation. Taking 24# ore pass in Li Lou iron mine as the original model, the similarity model of the high ore pass was built, tests were conducted for impacting air flows under different unloading ore conditions. The results showed that the impact wind speed increases but its amplitude growth rate decreases with increase in the unloading ore flow rate, the maximum impact wind speed and the unloading ore flow rate form approximately a power function relation, the higher the unloading ore height, the larger the power exponent, the range of power exponent measured with tests is 0.593~0.732; the higher the unloading ore height, then the bigger the impacting air flow, the larger the space for ore particles dispersion, the smaller the interaction between particles, the bigger the induction effect on the air flow in the ore pass; the growth rate of the impacting air flow increase with increase in the unloading ore height; the greater the ore particle size range and drag coefficient at the exit, the smaller the impacting air flow; impacting air flow increases due to superposition effect with increases in segments of unloading ore,but it is far less than the sum of impacting air flows generated due to the separate unloading ore in each segment.
王明,蒋仲安, 陈举师,邓权龙. 高溜井卸矿冲击气流影响因素的相似理论与实验研究[J]. 振动与冲击, 2017, 36(23): 276-282.
WANG Ming, JIANG Zhong-an, CHEN Ju-shi, DENG Quan-long. Similarity theory and tests for impacting air flow influence factors during unloading ore in a high ore pass. JOURNAL OF VIBRATION AND SHOCK, 2017, 36(23): 276-282.
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