Relationship between fluorescence characteristics of coal macerals and excitation time

Q3 Energy
Ya-ru ZHANG , Jin-feng BAI , Li-jun JIN , Yang LI , Hao-quan HU
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引用次数: 0

Abstract

The fluorescence characteristics of coal macerals can be used as one of the indexes to evaluate the properties of coking coal. In this work, a single-wavelength laser with a wavelength of 360 nm was used as the excitation source to excite the surface of particulate block under a polarizing microscope. Effect of excitation time on fluorescence characteristics of the macerals was studied. The relationship between spontaneous fluorescence intensity and the excitation time of each maceral of six kinds of coking coals show that the fluorescence characteristics of coal macerals are related to the type and metamorphism of coal. The excitation time has a certain effect on the fluorescence parameters of the macerals. By comparing the relative fluorescence intensity values under different excitation times, it is found that the mean relative fluorescence intensity within 15 s can be used as an optical parameter to characterize the structure and metamorphic grade of different macerals. The essence of this method is to express movement of electrons in outer layer of nucleus by macroscopic fluorescence spectrum and relative fluorescence intensity of the initial state value and simplify microscopic complexity into macroscopic and numerical form generally accepted.

煤显微组织荧光特性与激发时间的关系
煤显微组织的荧光特性可作为评价焦煤性能的指标之一。本文采用波长为360 nm的单波长激光作为激发源,在偏光显微镜下激发颗粒块表面。研究了激发时间对微观结构荧光特性的影响。6种炼焦煤各显微组分的自发荧光强度与激发时间的关系表明,煤显微组分的荧光特性与煤的类型和变质有关。激发时间对产物的荧光参数有一定的影响。通过比较不同激发次数下的相对荧光强度值,发现15s内的平均相对荧光强度可以作为表征不同显微结构和变质等级的光学参数。该方法的实质是通过宏观荧光光谱和初始状态值的相对荧光强度来表示原子核外层电子的运动,将微观复杂性简化为普遍接受的宏观和数值形式。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
燃料化学学报
燃料化学学报 Chemical Engineering-Chemical Engineering (all)
CiteScore
2.80
自引率
0.00%
发文量
5825
期刊介绍: Journal of Fuel Chemistry and Technology (Ranliao Huaxue Xuebao) is a Chinese Academy of Sciences(CAS) journal started in 1956, sponsored by the Chinese Chemical Society and the Institute of Coal Chemistry, Chinese Academy of Sciences(CAS). The journal is published bimonthly by Science Press in China and widely distributed in about 20 countries. Journal of Fuel Chemistry and Technology publishes reports of both basic and applied research in the chemistry and chemical engineering of many energy sources, including that involved in the nature, processing and utilization of coal, petroleum, oil shale, natural gas, biomass and synfuels, as well as related subjects of increasing interest such as C1 chemistry, pollutions control and new catalytic materials. Types of publications include original research articles, short communications, research notes and reviews. Both domestic and international contributors are welcome. Manuscripts written in Chinese or English will be accepted. Additional English titles, abstracts and key words should be included in Chinese manuscripts. All manuscripts are subject to critical review by the editorial committee, which is composed of about 10 foreign and 50 Chinese experts in fuel science. Journal of Fuel Chemistry and Technology has been a source of primary research work in fuel chemistry as a Chinese core scientific periodical.
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