封堵高温裂隙的水泥基泡沫流体耐热性研究

发布时间：2018-03-04 20:09

  本文选题：高温裂隙　切入点：封堵　出处：《硅酸盐通报》2017年05期 　论文类型：期刊论文

【摘要】：煤岩体受热破坏形成的高温煤岩裂隙是煤田火区演化和蔓延的主要成因。水泥基泡沫流体作为一种新型的高温煤裂隙防控材料,其泡沫流体的耐热特性是其重要的技术参数。基于自制泡沫流体隔热性能测试系统,测试了不同支架高度(2 cm、7 cm、12 cm、17 cm、22 cm)和不同喷注厚度(20 mm、40 mm、60 mm、80 mm)情况下水泥基泡沫流体的隔热特性,得出随着测试时间的增加,20~80 mm各个喷注厚度的新鲜泡沫流体冷面温度都增加,在测试时间为0~90 s以内,温升曲线斜率较大;隔热温度空间分布整体在一个曲面上,进而拟合得到了隔热温度、喷注厚度、热面温度三者之间的关系式。受热情况下泡孔液膜微观形态变化表征显示泡沫流体在200℃出现失稳定,并从表面张力、液膜基质粘度、自由水含量三个方面分析了受热对液膜排液速度的影响。
[Abstract]:The thermal fracture of coal and rock mass is the main cause of evolution and spread of coal field fire zone. Cement based foam fluid is a new kind of high temperature coal fracture prevention and control material. The heat resistance of foam fluid is an important technical parameter. The thermal insulation properties of cement-based foam fluid were tested under the conditions of different support heights (2 cm, 7 cm, 12 cm, 17 cm, 22 cm) and different injection thickness, 20 mm / 40 mm / 60 mm / 80 mm). The results show that the cold surface temperature of the fresh foam fluid with different injection thickness increases with the increase of testing time. When the test time is less than 90 s, the slope of the temperature rise curve is large, the thermal insulation temperature is distributed on a curved surface, and the thermal insulation temperature and the injection thickness are obtained. The relationship between hot surface temperature and surface temperature. The microscopic morphology of bubble liquid film under heating condition showed that the foam fluid was unstable at 200 鈩，

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