硫化矿石堆自热的混沌特征

来源期刊:中南大学学报(自然科学版)2019年第2期

论文作者:潘伟 伍智伟 吴超 李孜军 李明 刘正洲 冯宴熙

文章页码:368 - 375

关键词:硫化矿石堆;自热过程;混沌特征;最大Lyapunov指数

Key words:sulfide ore heap; self-heating process; chaotic characteristics; the maximum Lyapunov exponent

摘    要:为揭示硫化矿石堆非稳态自热过程的混沌特征,以某硫铁矿矿石样品为实验材料,应用自主设计的实验装置,室内模拟矿石堆非稳态自热过程。通过小波变换、三维相图分析、功率谱分析和最大Lyapunov指数计算,对表征矿石堆自热过程的温度序列进行研究。研究结果表明:硫化矿石堆自热是一个混沌演化过程;随着深度增大,矿石堆混沌程度呈先增大后减小的趋势;最大Lyapunov指数与平均升温率呈正相关性,可基于最大Lyapunov指数对矿石堆不同区域的自燃倾向性进行评价。

Abstract: To reveal the chaotic characteristics of unsteady self-heating process of sulfide ore heap, ore samples from a pyrite mine in China were taken as experimental materials and the unsteady self-heating process of ore heap was simulated in laboratory with the experimental autonomous designed apparatus. Temperature series that characterized self-heating process of the ore heap were researched through the wavelet transform, 3D phase diagram analysis, power spectrum analysis and extraction of the maximum Lyapunov exponent. The results show that self-heating of sulfide ore heap is a chaotic evolution process. As the depth increases, the chaotic degree of ore heap increases at first and then decreases. The maximum Lyapunov exponent has a positive correlation with the increase of temperature. Therefore, it can be used to evaluate spontaneous combustion tendency of different regions in the ore heap.

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