基于煤矸石堆自燃热棒移热参数研究

Study on Heat Transfer Parameters of Hot Rod based on Spontaneous Combustion of Coal Gangue Pile

基于煤矸石堆自燃,热棒移热效果,如移热半径、不同倾角的关键参数研究较少。为进一步实现热棒移热性能最大化,基于 "移热降温"的技术思路,采用闭式汽-液两相流热棒移热的原理,运用实验研究方法,通过自行搭建的煤矸石堆热棒移热实验系统,利用Origin等数值分析软件,揭示了不同倾角下热棒对煤矸石堆自燃温度场分布特征及动态演化规律,分析了热棒对煤矸石堆内部蓄热状况的作用机制,分析了影响热棒移热效率的指标,完善了热棒在不同倾角下对煤矸石自燃火灾的热迁移模型。结果表明,热棒与地面夹角为45°时,最大温差为40℃,累计降温272℃,平均降温速率11.33℃/h,最大降温率为37%,此时热棒的降温效果最好,为实际应用中控制热棒的插入倾角提供理论指导。

Based on the background of less research on key parameters of hot rod such as heat transfer radius and different dip angles of coal gangue pile spontaneous combustion under the action of hot rod,in order to further maximize the heat transfer performance of hot rod,based on the technical idea of "heat transfer and temperature reduction",adopting the principle of closed steam-liquid two-phase flow heat rod heat transfer,using experimental research methods,through the self-built experimental system of heat rod heat transfer of coal gangue pile,using numerical analysis software such as Origin,this paper reveals the distribution characteristics and dynamic evolution law of temperature field of coal gangue pile spontaneous combustion under different dip angles,analyzes the action mechanism of hot rod on internal heat storage of coal gangue pile,analyzes the indexes affecting heat transfer efficiency of hot rod,and improves the heat transfer model of coal gangue spontaneous combustion fire under different dip angles.The results show that the maximum temperature difference is 40℃,the cumulative cooling is 272℃,the average cooling rate is 11.33℃/h,and the maximum cooling rate is 37% when the angle between the hot rod and the ground is 45°.At this time,the cooling effect of the hot rod is the best,which provides theoretical guidance for controlling the insertion angle of the hot rod in practical application.