胜利褐煤燃烧中未反应残留物结构特性及铁的添加效应

宋银敏; 冯伟; 王云飞; 李娜; 班延鹏; 滕英跃; 智科端; 何润霞; 周华从; 刘全生

胜利褐煤燃烧中未反应残留物结构特性及铁的添加效应

1.
内蒙古工业大学化工学院内蒙古自治区低阶碳质资源高值化利用重点实验室, 内蒙古呼和浩特 010051
2.
鄂尔多斯应用技术学院化学工程系, 内蒙古鄂尔多斯 017000

基金项目:

国家自然科学基金 1676149，21606134，21566029，21566028，21266017

内蒙古自然科学基金 2014MS0220，2015BS0206，2016BS0204

详细信息

中图分类号: TQ534
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- 文章访问数: 72
- HTML全文浏览量: 37
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- 被引次数: 0
出版历程
- 收稿日期: 2016-07-13
- 修回日期: 2016-09-21
- 网络出版日期: 2021-01-23
- 刊出日期: 2016-12-10

Structure characteristics of unreacted residues in combustion of Shengli lignite and effect of adding Fe components

1.
College of Chemical Engineering, Inner Mongolia University of Technology, Inner Mongolia Key Laboratory of High-Value Functional Utilization of Low Rank Carbon Resources, Huhhot 010051, China
2.
Department of Chemical Engineering, Ordos Institute of Technology, Ordos 017000, China

More Information

Corresponding author: Tel: 13664740405,liuqs@imut.edu.cn

摘要

摘要: 利用TGA确定胜利褐煤盐酸脱灰煤和添加铁组分脱灰煤的着火温度，在着火温度进行燃烧反应，收集燃烧反应一定时间后的未反应残留物，利用FT-IR、XPS、XRD和Raman等对其进行表征，研究了胜利褐煤燃烧过程中铁的影响规律。结果表明，铁的加入降低脱灰胜利褐煤的着火温度，当添加量为3.50%时，着火温度降低的幅度最大。在着火温度燃烧反应一定时间后未反应残留物的FT-IR表明，其有机官能团结构无显著变化，说明铁的添加并不影响其有机官能团结构特性，有机官能团不会对燃烧性能产生太大的影响。添加铁使SL⁺在燃烧过程中未反应残留物结构芳香度下降，晶面间距增大，晶体结构中缺陷位相对增加，石墨化程度降低，烷基侧链增多，碳氧结构迅速减少，说明铁组分的加入改变了其燃烧过程中碳氧结构转化特性，抑制了石墨化转化速率与程度，即在燃烧反应过程中改变了其未反应残留物的微结构，从而改变了其反应历程，加速燃烧反应速率。
- 胜利褐煤 /
- 煤燃烧 /
- 氯化铁 /
- 未反应残留物 /
- 结构特性
Abstract: The effect of Fe on structure of unreacted residues from combustion of demineralized Shengli lignite at ignition temperature was studied. TGA was adopted to investigate the ignition temperature of demineralized and Fe adding lignite, which were combusted at ignition temperature in quartz tube reactor to attain solid unreacted residues. The structure properties of lignite and the unreacted residues were investigated by FT-IR, XPS, XRD, and Raman spectra to study influence of Fe on the combustion reaction. The results indicate that adding of Fe lowers the ignition temperature of demineralized Shengli lignite, especially when the adding amount was 3.50%. The FT-IR of solid unreacted residues demonstrates that the adding of Fe has no obvious effect on functional groups of unreacted residues, suggesting that the functional groups are not the main factors to affect he combustion performance. The Fe adding accelerates the decrease of carbon-oxygen structure of SL⁺ during combustion and causes the reduced aromaticity and graphitization degree of unreacted residues, and favors the increase in alkyl side chain and crystal structure defects, indicating that the Fe adding promotes the changes in carbon-oxygen structure during combustion and restrains graphitized transformation of unreacted residues.
- Shengli lignite /
- combustion /
- ferric chloride /
- unreacted residues /
- structure characteristics

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图 1 SL⁺及添加不同含量铁煤样燃烧反应曲线

Figure 1 Combustion reaction curves of SL⁺ and Fe loaded samples

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图 2 添加铁脱灰褐煤的着火温度和燃烧反应活化能

Figure 2 Temperature and activation energy of demineralized lignite loaded with Fe

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图 3 胜利褐煤及燃烧残留物的红外光谱谱图

Figure 3 FT-IR spectra of Shengli lignite and unreacted residues

a: SL; b: SL⁺; c: SL⁺-R; d: SL⁺-5 Fe-R

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图 4 胜利褐煤及燃烧残留物的XPS谱图

Figure 4 XPS spectra of Shengli lignite and unreacted residues

a: SL; b: SL⁺; c: SL⁺-R; d: SL⁺-5 Fe-R

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图 5 胜利褐煤及燃烧残留物的XPS C 1s拟合图

Figure 5 XPS C 1s fitting of Shengli lignite and unreacted residues

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图 6 胜利褐煤及燃烧残留物中碳元素键合比例

Figure 6 Content of carbon bonding forms in Shengli lignite and unreacted residues

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图 7 胜利褐煤及燃烧残留物的XRD及拟合示意图

Figure 7 XRD and fitting curves of Shengli lignite and unreacted residues

(a): XRD spectra; (b): fitted method a: SL; b: SL⁺; c: SL⁺-R; d: SL⁺-5 Fe-R

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图 8 胜利褐煤及燃烧残留物的Raman谱及拟合图

Figure 8 Raman spectra and fitting method of Shengli lignite and unreacted residues

a: SL; b: SL⁺; c: SL⁺-R; d: SL⁺-5Fe-R

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表 1 煤样的工业分析

Table 1 Proximate analysis of coal samples

Sample	Proximate analysis w/%
Sample	M	A	V	FC
SL	4.22	12.3	33.5	49.9
SL⁺	4.07	5.38	37.9	52.7
SL⁺-0.5 Fe	1.37	5.21	34.3	59.1
SL⁺-1 Fe	2.15	5.19	33.2	59.5
SL⁺-2 Fe	1.43	7.14	34.0	57.4
SL⁺-5 Fe	5.38	8.01	30.1	56.5
SL⁺-10 Fe	5.38	12.5	32.2	49.9
note: M- moisture; A- ash content; V- volatile content; FC- fixed carbon

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表 2 煤样中金属组分的分布

Table 2 Percentage of metal components in coal samples

Sample	Content w/%
Sample	Si	Al	Ca	Na	Mn	K	Fe
SL	3.02	1.50	4.11	0.15	0.06	0.14	0.78
SL⁺	2.96	1.23	0.24	0.09	0.01	0.13	0.66
SL⁺-0.5 Fe	1.34	0.73	0.50	0.03	0.01	0.05	1.04
SL⁺-1 Fe	1.30	0.74	0.44	0.04	0.01	0.05	1.60
SL⁺-2 Fe	1.19	0.68	0.38	0.05	0.01	0.05	2.97
SL⁺-5 Fe	1.07	0.66	0.27	0.04	0.01	0.04	4.16
SL⁺-10 Fe	1.39	0.80	0.19	0.02	0.01	0.04	8.80

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表 3 胜利褐煤及燃烧残留物的晶体结构参数

Table 3 Crystalline structure parameters of Shengli lignite and unreacted residues

Sample	f_a	d₀₀₂/nm	L_c /nm	L_a /nm	N
SL	0.308	0.359	0.982	0.893	2.737
SL⁺	0.332	0.368	0.789	0.532	2.145
SL⁺-R	0.345	0.365	0.855	0.613	2.343
SL⁺-5 Fe-R	0.309	0.376	0.728	0.592	1.934

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表 4 胜利褐煤及燃烧残留物的Raman谱图拟合参数

Table 4 Raman spectra fitting parameters of Shengli lignite and unreacted residues

Sample	P_G-P_D (cm^-1)	I_D/ I_G	I_D/(I_D+I_G)	I_G/(I_D+I_G)	I_S/ I_G
SL	218.77	1.462	0.594	0.406	0.393
SL⁺	231.97	1.115	0.527	0.473	0.399
SL⁺-R	227.05	0.882	0.469	0.531	0.397
SL⁺-5 Fe-R	230.79	0.939	0.484	0.516	0.426

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