孟巴矿高地温环境煤孔隙及氧化动力学特征

doi:10.16265/j.cnki.issn1003-3033.2024.08.0061

摘要/Abstract

摘要：

为预防高地温煤层开采条件下煤自燃灾害,明确煤的自燃特性,以孟巴矿Ⅵ煤层1306工作面煤样为例,将煤样分别置于40、50、60 ℃控温炉中恒温处理30 天,采用全自动比表面积和孔径分布分析仪测试煤的孔隙结构,利用同步热分析仪测试原煤样和高温预处理煤样的氧化动力学参数。结果表明:孟巴矿煤样经高地温作用后,煤的小孔比例减小,中孔和大孔比例增大,煤样经60 ℃处理后比表面积由原煤的2.351 m²/g增至3.285 m²/g,总孔容由原煤的0.007 88 mL/g增至0.010 01 mL/g;与原煤相比,高地温处理后煤样点火温度和燃尽温度显著降低,最大失重量、最大失重速率分别提高6.1%和23.3%;高温处理后煤样的活化能和指前因子均小于原煤,说明高地温环境显著提高孟巴矿煤样的氧化反应活性,增大煤自燃的危险性。

关键词: 高地温, 孔隙结构, 氧化动力学特征, 热重(TG ), 煤自燃

Abstract:

In order to prevent coal spontaneous combustion disasters under high-temperature environment and clarify the spontaneous combustion characteristics, coal samples from the 1306 working face of the VI coal seam in Barapukuria coal mine were selected. The coal samples were subjected to constant temperature treatment at 40, 50, and 60 ℃ for 30 days, and pore structure analysis and thermogravimetry(TG) were performed on the raw coal samples and high-temperature pretreated coal samples to test the oxidation kinetic parameters. The results show that after high-temperature treatment, the proportion of small pores decreases while the proportion of medium pores and large pores increases. After treatment at 60 ℃, the specific surface area of the coal sample increases from 2.351 m²/g of raw coal to 3.285 m²/g, and the total pore volume increases from 0.007 88 mL/g of raw coal to 0.010 01 mL/g. In addition, compared with raw coal, the ignition temperature and burnout temperature of the coal sample significantly decreased after high-temperature treatment, and the maximum weight loss and the maximum weight loss rate increased by 6.1% and 23.3%, respectively. The calculation results of oxidation kinetics show that the activation energy and pre-exponential factor of the coal sample after high-temperature treatment are lower than those of the raw coal, indicating that the high-temperature environment significantly improves the oxidation reaction activity and increases the risk of spontaneous combustion of coal.

Key words: high ground temperature, pore structure, oxidation dynamic characteristics, thermogravimetric (TG), coal spontaneous combustion

中图分类号:

X936

马东, 解庆典, 赵志强, 刘方, 周齐庚. 孟巴矿高地温环境煤孔隙及氧化动力学特征[J]. 中国安全科学学报, 2024, 34(8): 162-169.

MA Dong, XIE Qingdian, ZHAO Zhiqiang, LIU Fang, ZHOU Qigeng. Characteristics of high temperature environment on coal pore structure and oxidation dynamics of Barapukuria coal mine in Bangladesh[J]. China Safety Science Journal, 2024, 34(8): 162-169.

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煤样	t₁	t₂	t₃	t₄	t₅	t₆	t₇
1306-原煤样	52.29	265.55	280.86	320.78	450.1	561.38	612.78
1306-40 ℃	52.29	259.54	275.67	316.68	436.71	529.67	581.07
1306-50 ℃	51.47	259.54	273.75	312.85	435.61	526.93	577.24
1306-60 ℃	51.46	250.24	267.46	311.21	429.87	463.23	573.41