Coal is the main energy source in China, and spontaneous combustion of coal is one of the main disasters in coal mines. Fully mechanized caving top coal mining technology is widely used in coal mines. Under the comprehensive action of multiple factors, gas generated by coal oxidation and low oxygen gas in goaf is easy to rush to working face, resulting in lower oxygen concentration in upper corner and exceeding harmful gas concentration. It seriously threatens the health of underground workers and the normal operation of production. If the oxygen concentration in the upper corner is changed, it is bound to cause the change of the oxygen concentration in the goaf and aggravate the threat of spontaneous combustion of coal in the goaf. In order to solve the double threat of low oxygen in upper corner and coal spontaneous combustion in goaf, based on Coulomb model, this paper uses command flow to conduct numerical simulation tests on the failure law of overlying strata, and obtains the influence of mining of the lower 1 coal seam and the lower 5 coal seam on the overlying strata subsidence and surface penetration. Based on the comprehensive consideration of atmospheric pressure, ore pressure activity, external air leakage and other factors, the mixed model of the source and emission of low oxygen gas in goaf was established, and the formation mechanism of low oxygen problem in the corner of return air of working face was defined. The use of pressure air belt to deal with low oxygen in return air corner is proposed creatively. The comprehensive fire prevention measures such as corner plugging, nitrogen injection and grouting are used to inhibit the oxidation of the left coal and the influx of low oxygen gas to the corner in the goaf, so as to achieve the goal of collaborative prevention and control of low oxygen in the corner of return air and coal spontaneous combustion. The research results have important reference significance for the mine with the risk of spontaneous combustion or the problem of low oxygen in the return air corner.

为了分析采空区内部自然发火最危险区域,明确最危险区域的位置和危险程度,为工作面自然发火防治提供依据.以一个工作面为例,运用COMSOL计算软件进行了采空区氧化中心数值模拟.模拟结果表明,在采空区深度方向上CO浓度存在一个最大值,即氧化中心,工作面进风侧向工作面回风侧氧化中心距离逐渐减小.氧化中心浓度最大值位于工作面倾斜方向的中部,进风侧氧化中心浓度大于回风侧氧化中心浓度.

针对煤自燃预测预报时采用负压束管监测系统存在巷道气体容易漏入束管中,使所监测到的气体成分和浓度不能真实反映监测地点实际情况的问题,基于正压输送气体方式在束管漏气的情况下不失真的特点,提出以正压束管监测系统作为监测采空区发火情况的方式,研制并测试了正压束管监测系统.利用不同长度的束管在地面进行正压输送气体试验,采用正压输送气体保证了气体浓度不变,正压束管所测得的数据能够真实反映出煤自然发火状态.

In this paper, study was carried out on the pulping system for mine fire prevention and extinguishing and comparison was made on the advantages and disadvantages of both the vertical and horizontal pulping machines. Based on the consideration of the economy and reliability and combined with the needs of the modern mine fire extinguishing by grouting, the module design of the pulping mechine was carried out by taking the horizontal pulping machne as the design condition after studying the pulping process and main parameters of the pulping machine. The horizontal pulping machine was divided into four modules, including the quantitative water-feed system, quantitative soil-feed system, continuous pulping system and grouting system. The applications in the fire extinguishing site indicated that the designed pulping machine ran reliably operate and its pulping capacity can meet the requirement of the fire extinguishing at the site.

针对容易自燃矿井工作面封闭失败后,CO体积分数迅速升高、 火区影响范围急剧扩大的问题,为了控制火势,采取封闭井筒、缩小火区范围等措施,给灭火提供便利条件.通过地面施工注浆钻孔,向工作面进、回风巷压住充填材料,实施巷道封堵.通过远距离实施巷道封堵,极大地降低井下施工的风险,迅速缩小封闭范围.

随着煤矿综合机械化采煤方法的更新换代,单个工作面产量成倍增加,根据当前灌浆防灭火方法计算出的灌浆量愈来愈大.通过分析影响工作面采空区浮煤自燃的主要因素,提出了通过工作面基本参数结合煤层最短自然发火期、采空区最大氧化带宽度来确定工作面灌浆量的计算方法.在同一工作面用两种方法计算并对结果进行比较,新的计算方法能适应高产高效工作面的灌浆需求.

为了寻找采空区内部氧化自燃最危险区域及其与工作面的距离,提出了采空区氧化中心确定原理及方法.介绍了采空区氧化中心的定义及意义,分析了采空区氧化中心的影响因素.采空区氧化中心包括氧化中心浓度和氧化中心距离,氧化中心浓度能清楚描述采空区内部氧化自燃最危险区域的危险程度,氧化中心距离能直观反映采空区内部氧化自燃最危险区域与工作面的距离,二者不受人为主观因素影响.应用实例表明,通过比较采取防灭火措施前后氧化中心距离和氧化中心浓度的变化情况,可以较好地评估所采取的防灭火措施的实施效果.

针对SF6在巷道漏风检测中存在的不足，研究了CO在煤矿漏风检测中的理论应用和实践经验，通过合理确定CO释放量，消除 CO对人体的毒性，通过释放前和释放后分别在采样点采集气样，消除巷道中CO 本底对检测精度的影响，提高漏风检测精度。

通过对地面立式制浆系统和卧式制浆系统的特点进行比较,从经济和可靠性方面综合考虑,选用地面立式制浆系统进行采空区灭火.通过2个搅拌桶轮流交替制浆和出浆,使制浆系统能够连续出浆,制浆效率较高,合理设计搅拌桶高度和直径使制浆系统与装载机和搅拌器相匹配,能够快速制浆.

临界流速是防灭火注浆系统管路输送的一个重要参数,在分析影响临界流速因素的基础上,探讨了现有的临界流速公式,指出费祥俊公式综合考虑了各主要影响条件,可以应用该公式计算临界流速,指导矿井防灭火注浆过程.

Aiming at the actual situation of coal fire in Fukang gas coal No.1 mine,this paper analyzes coal field features.By detecting outcrop and hidden fire source,six sources of fire in the detection area are found.Adopting the method of drilling grouting and glue injection,the fifth and sixth fire areas are governed emphatically.Through the comprehensive treatment,the surface subsidence has been effectively filled,and the phenomena of forming the water column and smoking have been effectively controlled in the fifth and sixth fire area.The coal fire extinguishing has achieved the expected effect.

采用SF6示踪气体连续释放法,通过确定采样时间,最短采样距离等漏风测定参数,对工作面巷道及采空区漏风进行了考察,得出了巷道及采空区漏风量的大小,为矿井火灾防治提供了科学依据。

通过对老石旦煤矿16402工作面采空区回风侧氧气浓度变化规律分析,确定了按氧气浓度划分采空区氧化自燃带范围.在分析低瓦斯矿井采空区自燃三带的基础上,结合压实区范围对氧化自燃带进行了修正.

In this paper,the distribution of the air leakage velocity in the gob was simulated by using FLUENT software according to the seepage equation of the gob and the momentum equation of the porous medium,and based on the partitioning criterion of "three spontaneous combustion zones" in the gob,the relation between the oxidation-combustion zone width in the gob and the face advance velocity was obtained: with the increase of the face advance velocity,the oxidation-combustion zone on the air-intake side,air-return side and at the middle of the face as well as the distance to the face will increase;the increment of the oxidation-combustion zone at the middle of the face and the distance to the face was relative large,and the increment of the oxidation-combustion zone on the air-intake side and air-return side and the distance to the face was rather small.

According to the mining space conditions of the 7601 fully mechanized top coal caving mining face in Wuyang Mine and based on the 3D mesh located measured points,the gas content of the full mining face was measured.The measured and analysis results showed that the coal mining face gas mainly could come from the coal wall of the coal mining face.The gas quantity from the coal wall would be depended on the original gas content of the seam,seam permeability,gas emission initial velocity and gas emission reduction coefficient.The gas volume fraction degree near upward corner of the coal mining face was up to about 1% and the gas volume fraction in the ventilation tubing was about 0.8%.The results of the gas drainage with the withdraw fan was obvious.

针对矿井通风系统图DXF文件,分析了其文件格式的结构特征,采用VC++程序设计语言开发出数据交换接口程序,在AutoCAD与自行开发软件之间建立数据通道,进行数据传递和共享,实现了对通风系统图的调用。

An analytical solution of one-and three-dimensional diffusion models in an unbounded space about a time-continuous point source and the method of image interference were used to study three-dimensional diffusion in roadway air with a fully reflecting boundary wall.The shortest fully-mixed distance and its stabilizing time were determined for dispersion of the tracing gas in the roadway air.If the hydraulic radius and friction coefficient are kept constant,the shortest fully-mixed distance increases linearly,and the time to reach equilibrium decreases by a negative power,with an increase in airflow velocity.The shortest fully-mixed distance decreases by a negative power,and the time to reach equilibrium follows a power law function,with an increase in the friction factor when the hydraulic radius and airflow velocity are constant.

采用示踪气体测定矿井漏风已成为一项主要的测漏技术,可以定量分析漏风情况。该方法分为瞬时释放法和连续定量释放法,当需要准确测定漏风量时必须采用连续定量释放法。介绍了连续定量释放法测定漏风原理,对释放点和采样点的位置等参数进行准确计算。

时间序列分析(Time series analysis)是一种动态数据处理的统计方法。该方法基于随机过程理论和数理统计学方法，研究随机数据序列所遵从的统计规律，以用于解决实际中遇到的短期预测问题。本文主要介绍了时间序列分析的ARMA(p, q)模型的建模方法及SAS（Statistical Analysis System）软件实现过程。将ARMA模型应用于工作面瓦斯浓度动态预测，结果表明ARMA是一种短期效果比较理想的预测模型，对预测工作面瓦斯浓度的动态变化规律具有十分重要的意义。