摘要:
通过对3种不同煤样酸化前后的渗透率测试,分析每种煤样渗透率的变化趋势,在不同压力、温度条件下测试不同酸化时间下的渗透率,分析得出煤体酸化后渗透率随酸化时间、压力和温度变化的规律。结果表明:13#烟煤、2#贫瘦煤的渗透率优于3#无烟煤,即中低阶煤的酸化效果比高阶煤好;围压对于渗透率的影响较为明显,随着围压的增加,渗透率呈现出减小的趋势;不同煤样在温度增加的前期阶段,随着温度的升高,渗透率呈现出加速增大的态势;在酸化的中间阶段,渗透率逐渐下降;在温度增加的后期阶段,渗透率随温度的升高虽还有所降低,但变化趋势不再特别明显,逐渐进入平稳阶段。
Abstract:
Through the permeability test of three different coal samples before and after acidification, the change trend of permeability of each coal sample is analyzed, and then the permeability under different pressures and temperature conditions is tested under different acidification time, and the laws of permeability changing with acidification time, pressure and temperature are obtained. The results show that the permeability of 13# bituminous coal and 2# lean coal is better than that of 3# anthracite, that is, the acidification effect of medium and low rank coal is better than that of high rank coal; the influence of confining pressure on permeability is more obvious, with the increase of confining pressure, the permeability shows a decreasing trend; in the early stage of temperature increase, with the increase of temperature, the permeability of different coal samples decreases. In the intermediate stage of acidification, the permeability decreases gradually; in the later stage of temperature increase, the permeability decreases with the increase of temperature, but the change trend is no longer particularly obvious, and gradually enters a stable stage.
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