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为研究热源及空隙率在松散煤体内自卷吸供氧过程中对上部松散煤体的影响,利用自制的高温松散煤体自吸氧试验装置,测试了热源温度分别为30℃、60℃、90℃、120℃、150℃、200℃时,粒径分别为1~3 mm、3~5 mm、5~7 mm、7~10 mm、10~15 mm的松散煤体的内部温度,计算了不同热源强度下松散煤体内部的浮升力。结果表明:1)当热源温度及煤体空隙率一定时,各测点温度分布基本呈线性变化规律,但是随着热源温度不断升高,线性变化规律减弱;2)空隙率一定时,随热源温度升高,松散煤体内各测点温度增大,各测点的温度梯度也增大;3)当热源温度值一定时,随煤体空隙率的增大,同一测点的温度值整体增大;4)随热源温度升高,煤体内各相邻测点区间浮升力大致呈指数规律变化;浮升力随热源升高而增大,不同测点区间的浮升力影响因素不同;当热源温度一定时,距离热源区间越远,煤体浮升力越小。
In order to study the influence of heat source and porosity on the loose bulk coal in the process of self-entrainment and oxygen supply in loose coal, the self-made high temperature loose coal spontaneous oxygen test device was used to test the heat source temperature were 30 ℃, 60 ℃, The internal temperature of loose coal with particle sizes of 1 ~ 3 mm, 3 ~ 5 mm, 5 ~ 7 mm, 7 ~ 10 mm and 10 ~ 15 mm at 90 ℃, 120 ℃, 150 ℃ and 200 ℃ was calculated The buoyant force inside loose coal body under different heat source intensity. The results show that: 1) When the temperature of heat source and the porosity of coal are constant, the distribution of temperature at each measuring point basically changes linearly, but the linear variation is weakened with the rising of heat source temperature. 2) When the porosity is constant, When the temperature of the coal increases, the temperature at each measuring point in loose coal increases, and the temperature gradient at each measuring point also increases. 3) When the temperature of the heat source is constant, with the increase of the porosity of the coal, Large; 4) With the increase of heat source temperature, the buoyant force of each adjacent measuring point in coal body changes roughly exponentially; the buoyant force increases with the increase of heat source, and the influencing factors of buoyancy force in different measuring points are different; Certainly, the farther away from the heat source interval, the smaller the lift of coal.