基于局部冻结的保温材料性能试验研究

Research on the Performance of Thermal Insulation Material Based on Partial Freezing

在深立井和斜井冻结工程中,部分冻结管需采用局部冻结方式以减小冷量损失避免土层过分冻结以及资源浪费,但常用聚氨脂发泡材料在地压作用下保温效果并不理想。针对这一技术问题,以3种不同材质的新型隔热保温材料为研究对象,然后在1.5MPa、2.5MPa围压以及恒定冷媒作用下,分别对其进行保温性能试验研究。结果表明:在1.5MPa和2.5MPa压力下,阻燃橡塑海绵保温板保温效果最佳,压花方格铝板隔热保温棉保温效果良好,而日固力防水隔热保温涂料保温效果一般。通过本次试验获得了考虑实际工况下最佳局部冻结保温材料,可为冻结工程应用提供参考。

In deep vertical shaft and inclined shaft freezing project,part of the freezing pipe needs to adopt local freezing mode to reduce the loss of cooling capacity and avoid excessive freezing of soil layer and waste of resources,but the thermal insulation effect of polyurethane foaming material commonly used under the action of ground pressure is not ideal.In response to this technical problem,three new thermal insulation materials were used as the research objects,and then under the action of 1.5MPa,2.5MPa and constant refrigerant,the thermal insulation performance tests were carried out respectively.The results show that under the pressures of 1.5MPa and 2.5MPa,the flame-retardant rubber-plastic sponge thermal insulation board has the best thermal insulation effect,the embossed aluminum sheet thermal insulation cotton a good thermal insulation effect,and the Riguli waterproof thermal insulation coating a general thermal insulation effect.Through this test,the best partial freezing insulation material under actual working conditions is obtained,which provides a reference for freezing engineering applications.