外来水分对煤自燃过程影响及作用机制研究

张晓昱; 张玉龙; 王俊峰; 郝宏德; 吴玉国; 周春山

外来水分对煤自燃过程影响及作用机制研究

张晓昱¹,
张玉龙¹,
王俊峰^{1, 2, ,},
郝宏德¹,
吴玉国^{1, 3},
周春山^{1, 3}

1.
太原理工大学安全与应急管理工程学院, 山西太原 030024
2.
太原理工大学矿业工程学院, 山西太原 030024
3.
山西省矿井通风与火灾防治工程技术研究中心, 山西太原 030024

基金项目:

国家自然科学基金 51704207

山西省优秀人才创新项目 201705D211004

详细信息

中图分类号: TD752.2
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- 被引次数: 0
出版历程
- 收稿日期: 2019-09-24
- 修回日期: 2019-12-10
- 网络出版日期: 2021-01-23
- 刊出日期: 2020-01-10

Study on the effect and mechanism of foreign moisture on coal spontaneous combustion

1.
School of Safety and Emergency Management Engineering, Taiyuan University of Technology, Taiyuan 030024, China
2.
School of Ming Engineering, Taiyuan Unversity of Technology, Taiyuan 030024, China
3.
Shanxi Engineering Research Center for Mine Ventilation and Fire Prevention, Taiyuan 030024, China

Funds:

the National Science Foundation for Young Scientists of China 51704207

Excellent Talents Science and Technology Innovation Project of Shanxi Province 201705D211004

More Information

Corresponding author: WANG Jun-feng, Tel: 13038001883, E-mail: tyutwjf@163.com

摘要

摘要: 通过浸泡方法制备一系列不同外来水分含量的煤体，利用程序升温氧化实验模拟煤自燃过程，研究外来水分对煤自燃特性的影响；结合热分析和孔结构表征实验，探讨外来水分对煤自燃过程影响作用机制。外来水分对煤自燃过程的作用机制随着煤自燃状态发展而发生变化，主要表现出四个阶段。在缓慢氧化阶段，外来水分主要隔离煤与氧气的接触反应，对煤自燃起到物理抑制作用；在加速氧化阶段，水分可直接参与煤氧反应，起到化学促进作用；经过缓慢氧化阶段和加速氧化阶段，大量外来水分的蒸发导致煤颗粒表面裂隙增大，水分越大的煤生成的活性点位会更多，当煤自燃进入快速氧化阶段，外来水分对煤氧化反应的影响表现出延迟促进效应；当煤体温度达到180 ℃后，随着煤体温度进一步升高，不同初始外来水分含量的煤体自燃特征逐渐趋于一致。
- 外来水分 /
- 煤自燃 /
- 阶段特征 /
- 作用机制
Abstract: A series of coal bodies with different foreign moisture was prepared by soaking a long flame coal with low water content. The effects of foreign moisture on the rate of temperature rising and the release of CO and CO₂ were studied by simulating coal spontaneous combustion. Moreover, the action mechanism of foreign moisture on the spontaneous combustion of coal was discussed in combination with the characterization of thermal analysis and the pore structure. The action regime of foreign moisture varies with the development of coal spontaneous combustion. At the slow oxidation stage, the foreign moisture plays a physical inhibition effect on coal spontaneous combustion mainly by isolating the contact reaction of coal and oxygen. At the accelerated oxidation stage, the water may involve in the process of the coal-oxygen reaction, promoting the rate of coal self-heating. After entering the rapid oxidation stage, due to the large amount of external water removal during the first and second stages, the pore structure and specific surface area of the coal body are increased; the higher the moisture content of coal, the more active sites will be generated, and the external water presents an indirect promoting effect. When the coal body temperature reaches 180 ℃, with the further increase of coal body temperature, the spontaneous combustion characteristics of coals with different initial external moisture content gradually tend to be consistent.
- foreign moisture /
- coal spontaneous combustion /
- phase characteristics /
- action regime

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图 1 程序升温氧化实验装置示意图

Figure 1 Schematic diagram of temperature programmed oxidation experimental device

1: nitrogen; 2: air; 3: mass flow meter; 4: heating furnace; 5: preheating gas circuit; 6: thermocouple in coal sample; 7: gas outlet; 8: thermocouple in furnace; 9: gas purifier; 10: air generator; 11: hydrogen generator; 12: gas chromatograph; 13: computer; 14: argon

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图 2 程序升温氧化过程中煤体温度的变化

Figure 2 Change trends of coal temperature during temperature programmed oxidation

(a): slow oxidation stage; (b): accelerated oxidation stage; (c): rapid oxidation stage

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图 3 不同外来水含量煤体在升温氧化过程中CO的释放

Figure 3 CO release in the process of temperature-raising and oxidation of coal with different external moisture content

(a): slow oxidation stage; (b): accelerated oxidation stage; (c): rapid oxidation stage

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图 4 不同氧化阶段CO₂释放浓度的变化

Figure 4 Variation of CO₂ release at different oxidation stages

(a): slow oxidation stage; (b): accelerated oxidation stage; (c): rapid oxidation stage

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图 5 不同含水量煤体升温氧化过程中的质量变化

Figure 5 Changing trend of quality in the process of heating and oxidation of coal with different water content

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图 6 水分参与煤氧反应作用机制示意图

Figure 6 Schematic diagram of action mechanism of external water involved in the oxidation reaction

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表 1 不同外来水分含量的煤体在不同氧化温度升温氧化过程中的比表面积

Table 1 Specific surface area of coal bodies with different external moisture content during the temperature rise and oxidation at different oxidation temperatures

Coal sample w/%	Specific surface area of coal bodies A/(m²·g^-1)
Coal sample w/%	40 ℃	70 ℃	110 ℃	130 ℃	180 ℃	220 ℃
20.00	0.52	1.53	5.62	6.38	6.95	5.13
15.00	0.89	1.76	5.10	5.85	6.38	5.01
11.40	1.34	1.95	4.56	5.48	5.91	4.78
8.30	1.65	2.11	4.11	5.03	5.63	4.59
5.00	1.93	2.25	3.89	4.75	5.12	4.65
3.50	2.15	2.52	3.67	4.46	4.85	4.22
1.58	2.60	3.01	3.52	4.17	4.46	4.01
0.00	2.51	2.80	3.35	3.51	3.82	4.13

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