基于COMSOL热强化SVE技术的污染场地数值模拟

NUMERICAL SIMULATION OF POLLUTED SITES BASED ON COMSOL THERMAL ENHANCEMED SVE TECHNOLOGY

利用COMSOL仿真软件分别模拟了尺度为2 m×2 m×1 m的SVE技术热反应单元,在地表以下1 m深度的温度场变化情况和地表以下0.5 m深度平面中的污染物迁移状态。对该尺度模型的温度场模拟发现,当热源功率在80 kW/m^3时,加热至70 h,场地最高温和最低温分别达到2500,500 K的稳定值,随后在此温度下增加速度场,抽气钻孔负压达到101.325 kPa时,在6 min达到迁移速度峰值0.3 m/s,6~10 min出现最大降幅,10 min后基本保持稳定。表征污染物在10 min时已实现大部分去除,随后产生常见的拖尾效应。

In this paper,COMSOL simulation software was used to simulate the thermal response unit of SVE technology with a scale of 2 m×2 m×1 m,for the temperature field variation of 1 m depth below the surface and the migration state of pollutants in the plane with a depth of 0.5 m below the surface.The temperature field simulation of the scale model showed that when the heat source power was 80 kW/m^3 with a duration of 70 h,the highest and lowest temperature of the site reached the stable values of 2500 K and 500 K,respectively.And then velocity field was applied at this temperature,when the negative pressure of pumping hole reached 101.325 kPa,and the peak migration velocity reached 0.3 m/s at 6 min.Migration velocity showed a most obvious decline in 6~10 min and got basically stable after 10 min.Therefore,most of the symbolizing pollutants had been removed in 10 min,followed by the trailing effect that was commonly seen in actual projects.