论文部分内容阅读
为了探索可控源微波场强化煤体瓦斯解吸扩散的机理,采用自主研制的可控源微波场作用下煤岩瓦斯解吸实验装置和扫描电子显微镜研究了微波场对煤体的甲烷解吸扩散特性、温度与表面结构形态的影响规律,分析了微波场对煤体的电磁辐射热效应和损伤效应.结果表明:微波在煤体的传播过程中会产生功率损耗,将电磁能转化为煤体的热能,使煤体温度升高并呈现出先快速上升、后保持大致线性增长的特征;微波场对煤体的穿透与选择性吸收的特性,改变了煤体的表面结构形态,使煤体出现诸如失水收缩、矿物界面剥离和碎裂、裂隙张开、形成孔洞等破坏形式.可控源微波场对煤体的电磁辐射热效应与损伤效应的共同作用,使煤体吸附瓦斯的能力降低、甲烷气体分子动能增加、煤体的瓦斯扩散通道更通畅,从而提高了煤体的瓦斯解吸与扩散能力.
In order to explore the controllable source microwave field to strengthen the mechanism of desorption and diffusion of coal gas, the desorption and diffusion characteristics of methane on coal by the microwave field were studied using coal gas desorption experimental device and scanning electron microscope under the controllable source microwave field independently developed. Temperature and surface morphology, the thermal effect and the damage effect of microwave radiation on coal are analyzed.The results show that the microwave produces power loss during the propagation of coal, converts electromagnetic energy into thermal energy of coal, So that the temperature of the coal body rises and presents the first rapid rise, followed by a general linear growth characteristics; microwave field penetrating and selective absorption of coal properties, changing the surface morphology of coal, the coal appeared such as loss Water shrinkage, debonding and fissuring of mineral interface, opening of fissures and forming vugs, etc. The combined effects of electromagnetic radiation heat effect and damage effect of coal in controlled source microwave field reduce the ability of coal to adsorb methane, and methane gas Increasing molecular kinetic energy, coal gas diffusion channels more open, thus enhancing the gas desorption and diffusion capacity of coal.