STUDY ON THE FEATURE OF ELECTROMAGNETIC RADIATION UNDER COAL OXIDATION AND TEMPERATURE RISE BASED ON MULTIFRACTAL THEORY
STUDY ON THE FEATURE OF ELECTROMAGNETIC RADIATION UNDER COAL OXIDATION AND TEMPERATURE RISE BASED ON MULTIFRACTAL THEORY
复制标题
DOI：
10.1142/s0218348x19500385
复制
发表时间：
2019-05-01
影响因子：
4.7
通讯作者：
Lu, Wei
中科院分区：
文献类型：
--
作者：
Kong, Biao;Wang, Enyuan;Lu, Wei
煤在氧化和升温过程中，由于热变形和热裂解，会产生大量的电磁辐射信号。电磁辐射信号的产生是煤在氧化和加热过程中物理化学变化的综合体现。因此，产生的信号包含复杂而丰富的信息，可以反映煤的内部结构的变化。本文利用多重分形理论分析了电子病历信号的特征。多重分形分析被用来解构EMR信号。初步研究表明，电磁辐射信号的多重分形谱具有小概率事件的特征。进一步的分析表明，电磁辐射信号的特征参数在加热后期与加热初期有很大的不同。在煤自燃初期，信号的多重分形谱较宽，但当煤达到燃烧时，EMR信号的标度范围显著增大，其结构在不同温度范围内发生变化。研究结果为煤炭自燃危险性的监测和预警提供了依据。
During coal oxidation and temperature rise, a significantly large amount of electromagnetic radiation (EMR) signals are generated as a result of thermal deformation and thermal cracking. The generation of EMR signal is the comprehensive embodiment of the physical and chemical changes in coal during its oxidation and subsequent heating. Therefore, the generated signals contain complex and rich messages that can reflect the changes in the internal structure of coal. In this work, the characteristics of EMR signal were analyzed by multifractal theory. Multifractal analysis was used to deconstruct EMR signals. Our preliminary study indicated that the multifractal spectrum of the EMR signal had a feature of small probability event. Further analysis demonstrated that the characteristic parameters of EMR signal are quite different at the later heating stage from those at the early heating stage. At the initial stage of coal spontaneous combustion, the multifractal spectrum of the signal is wider, but when coal combustion is reached, the scale range of EMR signal increases significantly, and its structure changes at different temperature ranges. The research results presented provide a basis for monitoring and presenting an early warning of coal spontaneous combustion risk.