煤炭地下气化通道传热下顶板岩温度和应力研究

李伟; 孙自强; 马彦; 孙希奎; 李木坤; 隋建才; 辛林; 辛爽; 牛茂斐

doi:10.19835/j.issn.1008-4495.20230189

煤炭地下气化通道传热下顶板岩温度和应力研究

Study on roof rock temperature and stress under heat transfer in underground coal gasification channel

摘要

摘要: 针对煤炭地下气化中的顶板岩稳定和气化热利用问题，建立了热—流—固耦合的流场和应力场计算模型，模拟研究了气化通道传热下顶板岩的温度、应力变化。结果表明，燃烧面前的顶板岩升温幅度低于燃烧面后的；随着燃烧面的推进，气化通道周围顶板岩的升温幅度和升温区域增大；高温可大幅增加顶板岩底部的拉应力和剪应力，最大可增加10倍以上；最大拉应力和最大剪应力发生在燃烧面所在的顶板岩底部位置，顶板岩主要发生拉伸破坏。

Abstract: Aiming at the problems of roof rock stability and efficient utilization of gasification heat in underground coal gasification, a calculation model of flow field and stress field with heat-fluid-solid coupling was established. The temperature and stress changes of roof rock were explored. It is found that the temperature increment of roof rock before combustion surface is lower than that after combustion surface. With the advance of the combustion surface, both the temperature increment and high temperature area of the roof rock around the exhaust drilling hole increase. The high temperature can greatly increase the tensile stress and shear stress at the bottom of roof rock, and the maximum tensile stress and shear stress increase by more than 10 times. The maximum tensile stress and shear stress occur at the location of the combustion surface of the roof rock bottom, and tensile failure mainly occurs in roof rock.

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