采空区注液氮降温对煤自燃热物理特性的影响研究

王飞; 孙文亮; 王海平; 刘红亮; 柴虎峰; 李云鹏; 肖旸; 刘凯

doi:10.13347/j.cnki.mkaq.20231691

采空区注液氮降温对煤自燃热物理特性的影响研究

1.
陕西长武亭南煤业有限责任公司，陕西长武 713600
2.
西安科技大学安全科学与工程学院，陕西西安 710054

详细信息

作者简介:
王　飞（1988—），男，陕西咸阳人，工程师，学士，从事煤矿“一通三防”方面的工作。E-mail：3401309267@qq.com

中图分类号: TD75⁺2.2
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出版历程
- 收稿日期: 2023-11-23
- 修回日期: 2024-01-05
- 刊出日期: 2024-07-19

Study on the influence of liquid nitrogen injection cooling in gob on the thermal physical characteristics of coal spontaneous combustion

1.
Shaanxi Changwu Tingnan Coal Industry Limited Liability Company, Changwu 713600, China
2.
School of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China

摘要

摘要:
为了研究注液氮降温对煤自燃的影响，选取亭南煤矿二盘区和三盘区煤样进行热物性实验。首先通过LFA457激光闪射仪对煤样进行预处理，再测定煤样30～300 ℃范围内的热物性参数，得到注液氮降温后煤样热物性参数随温度的变化规律，对比分析注液氮前后影响煤样热物理性质的因素。结果表明：注液氮处理前后的煤样，二者的热扩散系数都随着温度的升高而降低，比热容与导热系数随着温度的升高而上升；在30～200 ℃范围内，注液氮处理后煤样的热物性参数平均变化率高于原煤样，说明注液氮处理会增加煤样对温度的敏感性；此外，在相同温度下，注液氮处理后煤样热物性参数相较原煤样均有不同程度的上升，热扩散系数平均增长率最高，表明注液氮处理后的煤样在氧化升温过程中热扩散能力增强。
- 采空区 /
- 注液氮降温 /
- 煤自燃 /
- 热扩散 /
- 热物性参数
Abstract:
In order to study the effect of liquid nitrogen injection cooling on spontaneous combustion of coal, coal samples from the second and third panel areas of Tingnan Coal Mine were selected for thermal and physical property experiments. First, the coal sample was pretreated by LFA457 laser flash analyzer, and then the thermophysical property parameters of the coal sample were measured in the range of 30-300 ℃, and the change law of the thermophysical property parameters of the coal sample with temperature was obtained after liquid nitrogen injection and cooling, and the factors affecting the thermophysical properties of the coal sample were compared and analyzed. The results show that the thermal diffusivity decreases with the increase of temperature, and the specific heat capacity and thermal conductivity increase with the increase of temperature; in the range of 30-200 ℃, the average change rate of thermal property parameters of coal samples after liquid nitrogen injection treatment is higher than that of raw coal samples, indicating that liquid nitrogen injection treatment will increase the sensitivity of coal samples to temperature; in addition, at the same temperature, the thermal physical property parameters of coal samples after liquid nitrogen injection treatment increased to different degrees compared with the original coal samples, and the average growth rate of thermal diffusion coefficient was the highest, indicating that the thermal diffusion ability of coal samples after liquid nitrogen injection treatment was enhanced during the oxidation and heating process.
- gob /
- liquid nitrogen injection cooling /
- coal spontaneous combustion /
- thermal diffusion /
- thermophysical parameters

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图 1 激光导热原理

Figure 1. Laser pyrometer theory

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图 2 压片后煤样试件

Figure 2. Coal sample specimens after compression

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图 3 热扩散系数随温度的变化趋势

Figure 3. The variation trend of thermal diffusion coefficient with temperature

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图 4 比热容随温度的变化趋势

Figure 4. The trend of specific heat capacity with temperature

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图 5 煤样导热系数参数随温度的变化趋势

Figure 5. Variation trend of thermal conductivity parameters of coal samples with temperature

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图 6 热物性参数的平均变化率

Figure 6. The average change rate of thermophysical property parameters

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图 7 热物性参数的增长率

Figure 7. Growth rate of thermophysical parameters

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表 1 煤样工业分析结果

Table 1 Industrial analysis results of coal samples

煤样	M_ad/%	A_ad/%	V_ad/%	FC_ad/%
二盘区煤样	2.13	8.00	27.78	62.09
三盘区煤样	4.73	6.22	27.53	61.52
注：M_ad为水分；A_ad为灰分；V_ad为挥发分；FC_ad为固定碳。

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表 2 煤样薄片的相关属性

Table 2 Interrelated characteristics of coal slices

名称	标号	质量/mg	直径/mm	厚度/mm	密度/(g·cm⁻³)
二盘区	A₁	151.7	12.91	1.07	1.084
	A₂	152.7	12.89	0.98	1.149
	A₃	151.2	12.84	1.01	1.156
	A₄	149.8	12.89	0.93	1.235
	A₅	151.3	12.84	1.02	1.146
	A₆	153.1	12.86	1.13	1.043
三盘区	B₁	151.7	12.90	1.17	0.993
	B₂	153.5	12.81	1.16	1.027
	B₃	151.3	12.88	1.03	1.127
	B₄	151.4	12.96	1.00	1.148
	B₅	151.2	12.97	1.18	0.970
	B₆	150.5	12.84	1.07	1.056

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