【摘要】 目前，深井高温问题越来越突出，在充填体中加入相变材料来降低地温是解决深井高温问题的新思路。采用石蜡和CaCl₂·6H₂O制备新型复合相变材料，通过差示量热扫描仪、扫描电子显微镜、电液伺服岩石压力试验机和数值模拟等手段，研究含石蜡-CaCl₂·6H₂O充填体的相变前后的抗压强度与传热性能。研究结果表明：石蜡与CaCl₂·6H₂O复合后不发生化学反应，石蜡-CaCl₂·6H₂O不溶于水最佳复合质量比为3:2；石蜡-CaCl₂·6H₂O经济成本较低，在常用相变材料中经济排名靠前；加入石蜡-CaCl₂·6H₂O后充填体的抗压强度降低12.95%，石蜡-CaCl₂·6H₂O发生相变后，强度降低37.65%，但充填体的热量吸收能力提高79.60%；含石蜡-CaCl₂·6H₂O的充填体试样导热系数下降，在石蜡-CaCl₂·6H₂O相变阶段有温度响应滞后现象，温度等值线附近内部热流量方向在石蜡-CaCl₂·6H₂O未发生相变时指向石蜡-CaCl₂·6H₂O。新型石蜡-CaCl₂·6H₂O复合材料经济成本低，虽然加入充填体会降低充填体的抗压强度，但是能够大幅度提高充填体对热量的吸收。更多还原

【Abstract】 At present, the problem of high temperature in deep wells is becoming more and more prominent, and adding phase change materials to the filling body to reduce the ground temperature is a new idea to solve the problem of high temperature in deep wells. A new composite phase change material was prepared by paraffin and CaCl₂·6H₂O. The compressive strength and heat transfer performance of paraffin-CaCl₂·6H₂O filling body before and after phase change were studied by means of differential scanning calorimetry, scanning electron microscopy,electro-hydraulic servo rock pressure testing machine and numerical simulation. The results show that there is no chemical reaction between paraffin wax and CaCl₂·6H₂O, and the best mass ratio of paraffin-CaCl₂·6H₂O insoluble in water is 3 : 2. The economic cost of paraffin-CaCl₂·6H₂O is low, and it ranks in the front in the common phase change materials. After adding paraffin-CaCl₂·6H₂O, the compressive strength of the filling body decreases by 12.95%. After the phase change of paraffin-CaCl₂·6H₂O, the strength decreases by 37.65%, but the heat absorption capacity of the filling body increases by 79.60%. The thermal conductivity of the filling body sample containing paraffin-CaCl₂·6H₂O decreases, and there is a temperature response lag phenomenon in the phase transition stage of paraffin-CaCl₂·6H₂O. The direction of the internal heat flow near the temperature contour points to paraffin-CaCl₂·6H₂O when the phase transition does not occur. The new paraffin-CaCl₂·6H₂O composite material has low economic cost. Although the addition of filling material reduces the compressive strength of the filling body, it can greatly improve the heat absorption of the filling body.更多还原