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浙江大学学报(工学版)
浙江大学学报(工学版)  2022, Vol. 56 Issue (1): 144-151    DOI: 10.3785/j.issn.1008-973X.2022.01.016
能源工程、机械工程     
土壤原位热传导修复水-汽-热耦合输运模拟
徐馨宇1(),胡楠1,范利武1,2,*()
1. 浙江大学 热工与动力系统研究所，浙江 杭州 310027
2. 浙江大学 能源清洁利用国家重点实验室，浙江 杭州 310027
Coupled water-vapor-heat transport simulation on in-situ thermal conduction heating remediation of soil
Xin-yu XU1(),Nan HU1,Li-wu FAN1,2,*()
1. Institute of Thermal Science and Power Systems, Zhejiang University, Hangzhou 310027, China
2. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
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摘要：

为了研究有机污染场地原位热传导热修复过程中地层温度的时空分布规律，基于典型场地建立水-汽-热耦合输运模型，通过COMSOL Multiphysics多物理场仿真平台对原位热传导修复过程中的土壤温升进行数值模拟研究，预测得到温度、水相及蒸汽相浓度分布随时间的变化规律. 利用文献中的单根加热棒加热场地实测数据对模拟结果进行对比验证，通过参数化分析探究土壤孔隙度、水饱和度及毛细作用力对土壤温度时空分布的影响. 结果表明，大孔隙度和水高饱和度将导致土壤温升减慢，这是由于大量热量用于液态水蒸发过程. 毛细管力会强化液态水输运，增大蒸发速率．
关键词： 土壤原位热修复;  温度时空分布;  水-汽-热耦合输运;  水饱和度;  土壤孔隙度;  毛细力    
Abstract:

Numerical simulations were performed using COMSOL Multiphysics to analyze the temperature rise in soil during the course of thermal conduction heating (TCH) remediation based on a coupled water-vapor-heat transport model in order to analyze the underground temporal and spatial temperature distributions during in-situ TCH remediation of organic compound-contaminated soil. The transient variations of the distributions of temperature, and water and vapor concentrations were predicted. The numerical results were validated by comparing with the existing experimental data obtained with a single TCH tube from field tests. Then the effects of soil porosity, water saturation, and capillarity on the temporal and spatial temperature distributions were analyzed by parametric analysis. Results show that the temperature rise rate becomes slower with higher porosity and water saturation, because more heat is used for the evaporation of water. Capillary force contributes to water migration. Then the evaporation rate is increased.
Key words: in-situ thermal remediation of soil    temporal and spatial temperature distribution    coupled water-vapor-heat transport    water saturation    soil porosity    capillarity
收稿日期: 2021-01-20 出版日期: 2022-01-05
CLC:  X 53  
基金资助: 国家重点研发计划资助项目（2019YFC1805701）
通讯作者: 范利武     E-mail: xuxinyu0228@zju.edu.cn;liwufan@zju.edu.cn
作者简介: 徐馨宇（1998—），女，硕士生，从事土壤热修复过程的传热传质研究. orcid.org/0000-0002-1702-3570.E-mail： xuxinyu0228@zju.edu.cn
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引用本文:

徐馨宇,胡楠,范利武. 土壤原位热传导修复水-汽-热耦合输运模拟[J]. 浙江大学学报(工学版), 2022, 56(1): 144-151.

Xin-yu XU,Nan HU,Li-wu FAN. Coupled water-vapor-heat transport simulation on in-situ thermal conduction heating remediation of soil. Journal of ZheJiang University (Engineering Science), 2022, 56(1): 144-151.

链接本文:

https://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2022.01.016    或    https://www.zjujournals.com/eng/CN/Y2022/V56/I1/144

图 1  污染土壤热传导加热（ TCH ）修复过程示意图
图 2  单根加热棒加热过程温度变化的对比验证
图 3  土壤原位热修复单元的结构示意图
类别 ρ/(kg·m?3) cp/(J·kg?1·K?1) λ/(W·m?1·K?1) μ /(Pa·s)
土壤 2650 1750 1.41 —
水 998.2 4182 0.59 1.002×10-3
蒸汽 — 2062 0.026 1.8×10-5
干空气 1.205 1006 0.025 1.81×10-5
表 1  数值模拟中输入的热物性参数[24-25]
图 4  不同时刻的等温线图
图 5  热修复期间的土壤气相对流速度分布示意图
图 6  热修复期间土壤水分与蒸汽分布的示意图
图 7  不同孔隙度下加热过程中的温度变化
图 8  不同孔隙度下加热过程中的参数变化
图 9  不同含水量下加热过程中温度变化
图 10  不同土壤孔隙水饱和度下加热过程中的参数变化
图 11  不同毛细力下加热过程中的温度变化
图 12  不同毛细力下加热过程中参数随时间的变化
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