地热能道路融雪化冰过程实验研究

EXPERIMENTAL STUDY ON GEOTHERMAL ICE AND SNOW MELTING PROCESS FOR ROADS

建立了一套小型地热能道路融雪实验系统,进行了不同工况下的融化实验。结果表明,路面融化面积比曲线可以分为3个阶段:静止期、启动期和加速期。临界融化面积比与冰雪物理特性有关。当流体加热温度和环境条件相同时,平均融化速率大小顺序为:碎冰>实冰>人工雪>自然雪。当冰雪面积和厚度相同时,融化时间快慢顺序为:自然雪>人工雪>碎冰>实冰。与提高流体加热温度相比,合理设置待融时间可以更有效地缩短融化时间。采用35～40℃的地热尾水来实现道路融雪化冰是完全可行的,且有利于能量梯级利用。

A small-scale geothermal ice and snow melting system for roads was built, and dynamic melting experiments were carried out under different operating conditions. The results show that the curve of melting area ratio includes three phases, namely stationary phase, starting phase and accelerating phase. The critical melting area ratio, linked with thermal properties of ice and snow, was detemrined. For the same fluid temperature and ambient conditions, the average melting velocity follows this order： crushed ice 〉 solid ice 〉 artificial snow 〉 natural snow. For the same melting area and thickness, the melting time follows this order： natural snow 〈 artifiCial snow 〈 crushed ice 〈 solid ice. Compared with the increasing fluid temperature, the optimal idling time can reduce the melting time of ice and snow more effectively. It is feasible that the geothermal tail water of 35～40℃ should be used for ice and snow melting on roads, which is helpful for the energy cascade utilization.