倾斜放置方式下煤自燃温度变化规律研究  

Study on change rule of coal spontaneous combustion temperature under tilting placement mode

作　　者：赵婧昱 张永利 ZHAO Jingyu;ZHANG Yongli(School of Safety Science and Engineering,Xi'an University of Science and Technology,Xi'an 710054,China;Shaanxi Engineering Research Center for Industrial Process Safety&Emergency Rescue,Xi'an 710054,China;Shaanxi Key Laboratory of Prevention and Control of Coal Fire,Xi'an 710054,China)

机构地区：[1]西安科技大学安全科学与工程学院,陕西西安710054 [2]陕西省工业过程安全与应急救援工程技术研究中心,陕西西安710054 [3]陕西省煤火灾害防治重点实验室,陕西西安710054

出　　处：《煤矿安全》2022年第9期77-85,共9页Safety in Coal Mines

基　　金：国家自然科学基金资助项目(52174202);西安科技大学优秀青年科学基金资助项目(2020YQ3-02)。

摘　　要：煤自燃在实际现场中的发展过程十分复杂,自燃过程受到的影响因素诸多,关键点之一就是火源的温度变化,且在实际工况中,火源位置往往较为隐蔽,难以发现,导致温度变化方向及区域也难以跟踪确定。因此,在常温常压的实验环境中,对煤自燃发展过程的温度进行监测,分析倾斜放置方式下温度的变化规律,确定高温区域及其蔓延模糊路径,进一步分析火风压对高温区域温度变化的影响。研究表明:高温区域蔓延呈非线性变化,主要沿着炉体中部及东南侧的方向蔓延;在实验前期,温度对火风压的影响占据主要地位;实验后期则是标高差对火风压的大小起主导作用;浅部煤样温度变化主要受热传导作用影响,上部煤样温度变化除受到热传导作用外,还受到燃烧所产生的裂隙影响,下部煤样还受到火风压的作用,导致温度随层数加深逐渐降低。The development process of coal spontaneous combustion in the actual site is very complex, and the spontaneous combustion process is affected by many factors. One of the key points is the temperature change of fire source. In the actual working conditions, the location of fire source is often hidden and difficult to find, making it difficult to track and determine the direction and region of temperature change. Therefore, in the experimental environment of room temperature and room pressure,the temperature of coal spontaneous combustion is monitored, and the temperature change law under the inclined placement mode is analyzed to determine the high temperature area and its spread fuzzy path, and further analyze the influence of fire air pressure on the temperature change in the high temperature area. The study shows that the spread of high temperature area is nonlinear,mainly along the central and southeast direction of the furnace body. In the early stage of the experiment, the influence of temperature on the fire heating air pressure occupies the main position, while the elevation difference plays the leading role in the size of the fire heating air pressure. The temperature change of the shallow coal sample is mainly affected by thermal conduction.The temperature change of the upper coal sample is not only affected by thermal conduction, but also affected by the cracks produced by combustion, and the lower coal sample is also affected by fire air pressure, resulting in the gradual decrease of temperature with the deepening of the number of layers.

关 键 词：煤自燃 倾斜放置 温度变化 蔓延模糊路径 火风压 

分 类 号：TD752.2[矿业工程—矿井通风与安全]