麻家梁矿采空区遗煤自然发火规律实验研究

发布时间：2018-05-06 19:22

本文选题：含水采空区 + 遗煤　；参考：《中国矿业大学》2015年硕士论文

【摘要】：朔南矿区麻家梁矿位于山西省朔州市朔城区境内,矿井设计产量12Mt/a,采用综采放顶煤一次采全高回采技术。目前回采的4#煤层平均厚度9.8m,各工作面宽度均为250m,走向长度在2500m左右。由于采空区内部空间漏风量大,回采后产生的遗煤较多,加之采空区常受到顶板涌水的影响,造成采空区内部浸水后的遗煤自燃规律难以完全掌握,给矿井防灭火工作带来极大困难。本文以麻家梁矿综放开采工作面为工程研究背景,基于分析影响煤炭自燃的充分和必要条件,开展不同含水率情况下的遗煤自燃特性试验、采空区自燃“三带”分布规律平台模拟实验,通过现场考察,分析研判采空区内部漏风和遗煤分布规律,旨在建立集“火灾预报——火灾预防——应急灭火”三位一体的矿井综合防灭火技术体系。主要研究内容如下:(1)通过对不同含水率的煤样进行程序升温试验,确定采空区遗煤在含水条件下的自燃特性,优选出含水遗煤自燃指标性气体,依此建立采空区自燃“火灾预报”体系;(2)利用采空区遗煤自燃“三带”模拟实验平台,研究采场通风量大小与空间自燃“三带”动态变化的相关性,分析工作面风量大小的改变与空间自燃“三带”在横向、纵向的范围变化关系;(3)通过对割煤、放煤循环全过程连续观测,分析采空区内部实际遗煤分布状态;通过对工作面不同地点通风情况的现场测定,分析采空区内部漏风区域分布情况。由此,确定出采空区遗煤自燃危险区域分布情况;(4)针对采空区内部遗煤自燃危险区域分布,提出工作面端头堆垛封堵墙技术,减少向采空区内部漏风,提出采空区注入氮气技术,降低采空区氧气含量,为提高防灭火措施的有效性,提出低温氮气阻化细水雾技术,由此建立采空区遗煤自燃“火灾预防”体系;提出采空区注液氮应急防灭火技术,结合矿井实际开采条件编制应用方案,建立采空区遗煤自燃火灾“应急灭火”技术。
[Abstract]:Majialiang Mine of Shuonan Mining area is located in Shuocheng District, Shuozhou City, Shanxi Province. The design output of the mine is 12 Mt / a. At present, the average thickness of coal seam is 9.8 m, the width of each face is 250m, and the strike length is about 2500m. Due to the large amount of air leakage in the inner space of the goaf, the large amount of residual coal produced after mining, and the influence of roof water on the goaf, it is difficult to grasp the spontaneous combustion law of the coal left after soaking inside the goaf. It is very difficult to prevent and extinguish the fire in the mine. Taking the fully mechanized caving mining face of Majialiang Coal Mine as the engineering research background, based on the analysis of the sufficient and necessary conditions affecting the spontaneous combustion of coal, the experiments on the spontaneous combustion characteristics of the residual coal under different moisture content are carried out. The distribution law of "three zones" of spontaneous combustion in goaf is simulated by the platform simulation experiment. Through field investigation, the distribution law of air leakage and residual coal in goaf is analyzed and judged. The purpose of this paper is to set up a comprehensive technical system of mine fire prevention and extinguishing, which integrates "fire forecast-fire prevention-emergency extinguishing". The main research contents are as follows: (1) through the programmed heating test of coal samples with different moisture content, the spontaneous combustion characteristics of coal left over in goaf under the condition of water cut are determined, and the index gas of spontaneous combustion of coal with water content is selected. Based on this, the "fire forecast" system of goaf spontaneous combustion is established. Using the "three zones" simulation experimental platform of spontaneous combustion in goaf, the correlation between the volume of ventilation in stope and the dynamic change of "three zones" in space spontaneous combustion is studied. This paper analyzes the relationship between the change of air volume and the horizontal and longitudinal range of the "three zones" of space spontaneous combustion. The distribution of the actual coal remains in the goaf is analyzed through continuous observation of the whole process of coal cutting and coal drawing cycle. The distribution of air leakage in goaf is analyzed by field measurement of ventilation in different working face. Therefore, the distribution of the dangerous area of coal spontaneous combustion in goaf is determined. In view of the distribution of dangerous area of spontaneous combustion of coal left in goaf, the technology of stacking and blocking wall at the end of the working face is put forward to reduce the air leakage inside the goaf. The technology of injecting nitrogen into goaf to reduce oxygen content in goaf is put forward. In order to improve the effectiveness of fire prevention measures, the technology of preventing water mist by low temperature nitrogen gas is put forward, and the "fire prevention" system of spontaneous combustion of coal left in goaf is established. This paper puts forward the emergency fire prevention and fire extinguishing technology with liquid nitrogen injection in goaf, and establishes the "emergency fire extinguishing" technology combining with the actual mining conditions of the mine to establish the "emergency fire extinguishing" technology for the spontaneous combustion of coal left behind in the goaf.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD752.2

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