孟巴矿高地温环境煤孔隙及氧化动力学特征
Characteristics of high temperature environment on coal pore structure and oxidation dynamics of Barapukuria coal mine in Bangladesh
马东 1解庆典 2赵志强 2刘方 3周齐庚1
作者信息
- 1. 中国矿业大学 煤炭精细勘探与智能开发全国重点实验室,江苏 徐州 221116
- 2. 徐州矿务集团有限公司 孟煤项目联合体,江苏 徐州 221006
- 3. 中国机械进出口(集团)有限公司 孟煤项目联合体,北京 100037
- 折叠
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.
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.
关键词
高地温/孔隙结构/氧化动力学特征/热重(TG)/煤自燃Key words
high ground temperature/pore structure/oxidation dynamic characteristics/thermogravimetric(TG)/coal spontaneous combustion引用本文复制引用
出版年
2024
NETL
NSTL
万方数据