煤岩显微组分荧光特征与激发时间的关系

张雅茹; 白金锋; 靳立军; 李扬; 胡浩权

doi:10.1016/S1872-5813(23)60339-1

煤岩显微组分荧光特征与激发时间的关系

doi: 10.1016/S1872-5813(23)60339-1

张雅茹^{1, 2,},
白金锋^2,,
靳立军^1,,
李扬^1,,
胡浩权^1, ,

1.
大连理工大学化工学院煤化工研究所精细化工国家重点实验室, 大连 116024
2.
辽宁科技大学化学工程学院, 鞍山 114051

基金项目: 国家重点研发计划（2016YFB0600301）资助

详细信息

通讯作者:
Tel: + 86-411-84986157，E-mail: hhu@dlut.edu.cn

中图分类号: TQ520.1
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出版历程
- 收稿日期: 2022-11-16
- 修回日期: 2022-12-29
- 录用日期: 2022-12-30
- 网络出版日期: 2023-02-10
- 刊出日期: 2023-09-30

Relationship between fluorescence characteristics of coal macerals and excitation time

ZHANG Ya-ru^{1, 2
,},
BAI Jin-feng^2
,,
JIN Li-jun^1
,,
LI Yang^1
,,
HU Hao-quan^{1
, ,}

1.
State Key Laboratory of Fine Chemicals, Institute of Coal Chemical Engineering, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China
2.
School of Chemical Engineering, University of Science and Technology Liaoning, Anshan 114051, China

Funds: The project was supported by the National Key Research and Development Program of China (2016YFB0600301)

摘要

摘要: 本研究采用360 nm波长的单波长激光作为激发光源，在偏光显微镜下对煤光片进行激发，研究激发时间对显微组分荧光特征的影响。通过对六种炼焦煤各显微组分的荧光强度与激发时间的关系研究表明，煤岩显微组分的荧光特征与煤岩类型及变质程度有关；激发时间对各显微组分的荧光参数具有一定的影响。通过对比不同激发时间下的相对荧光强度，发现15 s内的平均相对荧光强度可作为表征不同显微组分的结构和变质程度的光学参数。该方法的实质是将原子核外层电子的运动状况通过宏观的荧光光谱和具体的相对荧光强度进行表达,使其微观上的复杂性简化为宏观上和数值上可以被人们普遍接受的形式。
- 煤 /
- 显微组分 /
- 荧光特征 /
- 激发时间
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.
- coal /
- maceral /
- fluorescence characteristics /
- excitation time

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FIG. 2664. FIG. 2664.

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图 1 煤岩显微组分荧光强度测定装置示意图

Figure 1 Device for measuring the fluorescence intensity of coal macerals

1: Laser controller; 2: Rotating carrier table (with a stepper motor); 3: Sample; 4: UV excitation light source; 5: Objective lens (LD 50 × /0.50); 6: Eyepiece; 7: Optical fiber; 8: Polarizing microscope; 9: Revolving nosepiece; 10: Objective lens (oil, × 50); 11: Spectrometer; 12: Darkroom; 13: Camera obscura; 14: Computer

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图 2 镜质组抛光表面(干物镜“Epiplan”LD 50×/0.50,反射光) (a)以及最大荧光强度(b)及对应波长(c)随时间变化

Figure 2 Vitrinite on the polished surface (objective "Epiplan" LD 50×/0.50 under normal reflected light) (a), variation of maximum fluorescence intensity (b) and corresponding wavelength (c) with time

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图 3 壳质组抛光表面(干物镜“Epiplan”LD 50×/0.50,反射光) (a)以及最大荧光强度(b)和对应波长(c)随时间变化

Figure 3 Liptinite on the polished surface (objective "Epiplan" LD 50×/0.50 under normal reflected light) (a), variation of maximum fluorescence intensity (b) and corresponding wavelength (c) with time

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图 4 惰质组抛光表面(干物镜“Epiplan”LD 50×/0.50,反射光) (a)及其最大荧光强度(b)和对应波长c)随时间变化

Figure 4 Inertinite on polished surface of (objective “Epiplan” LD 50×/0.50 under normal reflected light) (a), and variation of maximum fluorescence intensity (b) and corresponding wavelength (c) with time

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图 5 不同激发时间煤岩显微组分相对荧光强度

Figure 5 Relative fluorescence intensity of coal macerals under different excitation time

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图 6 六种煤样中镜质组荧光强度及对应波长随激发时间的变化

Figure 6 Vitrinite fluorescence intensity and corresponding wavelength of different coal samples with time 1# (a), 2# (b), 3# (c), 4# (d), 5# (e), 6# (f)

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图 7 六种煤中的煤岩显微组分相对荧光强度随激发时间的变化

Figure 7 RFI alterations of vitrinites (a), liptinites (b), inertinites (c) with time of six coal samples

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图 8 六种煤样中壳质组荧光强度及对应波长随激发时间的变化

Figure 8 Liptinite fluorescence intensity and corresponding wavelength of different coal samples with time, 1# (a), 2# (b), 3# (c), 4#(d), 5# (e), 6# (f)

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图 9 六种煤样中惰质组荧光强度及对应波长随激发时间的变化

Figure 9 Inertinites fluorescence intensity and corresponding wavelength of different coal samples with time, 1# (a), 2# (b), 3# (c), 4# (d), 5# (e), 6# (f)

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图 10 多组分荧光强度RFIM与$\overline{R}$_max值关系

Figure 10 Relationship between RFIM and $\overline{R}$_max

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图 11 多组分相对荧光强度RFIM与G值关系

Figure 11 Relationship between RFIM and G index

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表 1 样品煤岩显微组分含量

Table 1 Macerals contents of coal samples

Sample	Maceral content /%
Sample	Vitrinite (V)	Inertinite (I₀)	Liptinite (L)	Mineral (M)
1#	89.9	5.2	2.1	2.8
2#	73.5	24.5	0.8	1.2
3#	77.6	17.3	1.0	4.1
4#	75.3	18.8	2.8	3.1
5#	92.7	4.5	0.2	2.6
6#	86.5	11.9	0.1	1.5

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表 2 煤样镜质组反射率分布

Table 2 Vitrinite reflectance of coal samples

Sample	R_ran/%		$\overline{{R} }$_ran/%	$\overline{{R} }$_max/%	S_D	Coding	C.V
Sample	maximum	minimum	$\overline{{R} }$_ran/%	$\overline{{R} }$_max/%	S_D	Coding	C.V
1#	0.70	1.00	0.85	0.91	0.052	0	6
2#	0.70	1.05	0.85	0.91	0.069	0	8
3#	0.80	1.40	1.10	1.17	0.107	1	10
4#	0.75	1.35	1.11	1.18	0.120	1	11
5#	0.90	1.60	1.26	1.34	0.125	1	10
6#	0.95	1.60	1.41	1.50	0.147	1	10
*R_ran: random reflectance; $\overline{{R} }$_max: mean maximum reflectance; S_D: standard deviation; Coding: the code of reflectogram of vitrinite; C.V: Coefficient of variation of vitrinite random reflectance, C.V=S_D /$\overline{{R} }$_ran × 100%

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表 3 煤样的工业分析、元素分析和黏结特性分析

Table 3 Proximate analysis, ultimate analysis and caking properties of coal samples

Sample	Proximate analysis w/%				Ultimate analysis w_daf/%					H/C	G	Y/mm
Sample	M_ad	A_d	V_daf	FC_daf^*	C	H	N	S	O*	H/C	G	Y/mm
1#	0.83	7.54	39.35	60.65	78.58	5.30	1.56	0.84	13.72	0.81	101	33.5
2#	0.48	9.24	28.18	71.82	77.46	4.82	0.98	0.37	16.37	0.75	87	15.0
3#	0.49	10.47	31.28	68.72	76.28	4.65	1.50	0.51	17.06	0.73	92	26.0
4#	0.65	10.26	31.94	68.06	76.65	4.66	1.50	0.49	16.70	0.73	91	28.0
5#	0.48	9.01	27.00	73.00	79.67	4.76	1.64	0.46	13.47	0.72	94	22.1
6#	0.67	9.92	19.61	80.39	81.23	4.10	1.28	1.54	11.85	0.60	85	14.6
*: by difference; G: caking index; Y: plastometric index

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表 4 样品煤岩显微组分荧光参数对照表

Table 4 Comparison of fluorescence parameters of coal macerals

Fluorescence parameter	Vitrinite	Liptinite	Inertinite
Mean fluorescence intensity for 15 s, FI₁₅	58.56	143.39	94.16
Mean fluorescence intensity for 750 s, FI₇₅₀	46.32	140.45	75.78
Mean fluorescence intensity from initial excited state to stationary state, FI_A	69.85	155.34	78.59
Mean intensity of excitation light source within15 s, LSI₁₅	1.92	4.16	51.16
Mean intensity of excitation light source within 750 s, LSI₇₅₀	1.72	3.39	47.66
Mean intensity of excitation light source from the initial excited state to stationary state, LSI_A	3.65	5.11	57.03
Mean relative fluorescence intensity within15 s, RFI₁₅	30.50	34.50	1.85
Mean relative fluorescence intensity within 750 s RFI₇₅₀	26.93	41.43	1.59
Mean relative fluorescence intensity from the initial excited state to stationary state, RFI_A	22.85	25.66	1.42

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