真三轴应力下注蒸汽过程中无烟煤煤体内温度场分布规律研究
Experimental study on temperature field distribution in anthracite during water vapour injection under triaxial pressure
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摘要: 利用实验室自行组装的实验设备，进行了真三轴压力下单裂缝无烟煤煤体注蒸汽热响应特征研究实验。结果表明：预制裂缝面测点温度的升温过程具有明显的阶段性，可分为常温-沸点的升温阶段，温度为沸点的蒸汽相变阶段，高于沸点的升温阶段；且距离蒸汽进口端越远，在第2阶段保持的时间越长；在轴压侧压均为7.5 MPa，蒸汽压力为1 MPa的情况下，蒸汽注入无烟煤后，热量主要靠热传导方式使非裂隙面煤体升温；利用COMSOL对实验情况进行数值模拟，利用二分法的思路选取热传导系数，将模拟值与实验值进行对比分析，最终得到无烟煤的热传导系数。Abstract: In this paper, the thermal response characteristics of single fracture anthracite sample injected with hot steam under triaxial pressure were studied by using the experimental equipment assembled in the laboratory. The results show that the temperature rising process of the measuring points on the prefabricate fracture surface has obvious stages, which can be divided into temperature rise stage when the temperature is between room temperature and boiling point, the steam phase transition stage when the temperature is boiling point, and temperature rise stage when temperature is higher than boiling point heating stage. The farther away from the steam inlet, the longer the holding time in the second stage. When the axial pressure and confining pressure is 7.5 MPa and the steam pressure is 1 MPa, the heat mainly depends on the heat conduction mode to make the temperature of the coal body of non-fracture surface rise. COMSOL is used to simulate the experimental conditions, and the heat conduction coefficient is selected by dichotomy method. The simulation value is compared with the experimental value, and the thermal conductivity of anthracite is finally obtained.
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