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Journal of Thermal Science

热科学学报

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2024 , Vol. 33 >Issue 2: 696 - 709

DOI: https://doi.org/10.1007/s11630-024-1948-6

Effects of Diesel Concentration on the Thermal Conductivity, Specific Heat Capacity and Thermal Diffusivity of Diesel-Contaminated Soil

  • WU Yuhao ,
  • WU Yuefei ,
  • LUO Gubai ,
  • ZHANG Teng ,
  • WANG Qing ,
  • FAN Liwu ,
  • SONG Xin ,
  • YU Zitao
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  • 1. Key Laboratory of Clean Energy and Carbon Neutrality of Zhejiang Province, Zhejiang University, Hangzhou 310027, China
    2. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
    3. Institute of Thermal Science and Power Systems, School of Energy Engineering, Zhejiang University, Hangzhou 310027, China
    4. Center Environmental Protection Technology Company Limited, Beijing 100176, China
    5. Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China

网络出版日期: 2024-03-07

基金资助

This study was financially supported by the National Key Research and Development Program (project No. 2019YFC1805700; program No. 2019YFC1805701).

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2024
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Effects of Diesel Concentration on the Thermal Conductivity, Specific Heat Capacity and Thermal Diffusivity of Diesel-Contaminated Soil

  • WU Yuhao ,
  • WU Yuefei ,
  • LUO Gubai ,
  • ZHANG Teng ,
  • WANG Qing ,
  • FAN Liwu ,
  • SONG Xin ,
  • YU Zitao
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  • 1. Key Laboratory of Clean Energy and Carbon Neutrality of Zhejiang Province, Zhejiang University, Hangzhou 310027, China
    2. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
    3. Institute of Thermal Science and Power Systems, School of Energy Engineering, Zhejiang University, Hangzhou 310027, China
    4. Center Environmental Protection Technology Company Limited, Beijing 100176, China
    5. Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China

Online published: 2024-03-07

Supported by

This study was financially supported by the National Key Research and Development Program (project No. 2019YFC1805700; program No. 2019YFC1805701).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2024
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摘要

目前，针对石油烃污染场地的修复技术——原位热脱附技术存在能耗高的问题。掌握污染土壤的关键热物性参数（热导率、比热容和热扩散率）有助于准确模拟计算修复场地的热量传递和温度分布，进而指导工程上优化方案，以实现节能降碳。然而，目前鲜有关于石油烃污染土壤的此类数据报道。在本研究中，制备了干容重恒定而柴油（石油烃的代表物之一）质量浓度在0~20%之间的土壤样品，并在0~120 ℃的宽温度范围内测量和分析了其热导率、比热容和热扩散率的变化规律。实验结果表明，当柴油浓度低于1%时，柴油对土壤热导率的影响可忽略。当柴油浓度低于10%时，土壤的热导率与温度的变化趋势相同；当柴油浓度超过10%时，土壤热导率则与温度的变化趋势相反。各类土壤矿物的热导率通常随着温度的升高而增大，而柴油的热导率则随着温度的升高而减小，因此土壤矿物和柴油之间的竞争关系决定了柴油污染土壤的热导率随温度的变化趋势。无论柴油浓度如何变化，土壤的比热容均与温度的变化趋势相同，土壤的热扩散率则均与温度的变化趋势相反。显著性检验结果表明，与温度相比，柴油浓度对土壤热物性的影响更为显著。此外，对照实验的结果表明，含有相同质量浓度的柴油和某一烷烃的土壤样品的热导率的相对差异均低于10%，因此本研究中用柴油获得的土壤热物性变化规律可以类比推广到各类石油烃污染场地。基于三维分形和热阻分析，提出了一个理论预测模型，证实了柴油浓度对土壤热导率的影响。为了便于实际应用，以实验数据为基础，提出了以柴油浓度为自变量的土壤热导率线性回归模型。

关键词： contaminated soil; diesel concentration; thermal conductivity; specific heat capacity; thermal diffusivity; thermal desorption; fractal model

本文引用格式

WU Yuhao , WU Yuefei , LUO Gubai , ZHANG Teng , WANG Qing , FAN Liwu , SONG Xin , YU Zitao . Effects of Diesel Concentration on the Thermal Conductivity, Specific Heat Capacity and Thermal Diffusivity of Diesel-Contaminated Soil[J]. 热科学学报, 2024 , 33(2) : 696 -709 . DOI: 10.1007/s11630-024-1948-6

Abstract

High energy consumption is a serious issue associated with in situ thermal desorption (TD) remediation of sites contaminated by petroleum hydrocarbons (PHs). The knowledge on the thermophysical properties of contaminated soil can help predict accurately the transient temperature distribution in a remediation site, for the purpose of energy conservation. However, such data are rarely reported for PH-contaminated soil. In this study, by taking diesel as a representative example for PHs, soil samples with constant dry bulk density but different diesel mass concentrations ranging from 0% to 20% were prepared, and the variations of their thermal conductivity, specific heat capacity and thermal diffusivity were measured and analyzed over a wide temperature range between 0°C and 120°C. It was found that the effect of diesel concentration on the thermal conductivity of soil is negligible when it is below 1%. When diesel concentration is below 10%, the thermal conductivity of soil increases with raising the temperature. However, when diesel concentration becomes above 10%, the change of the thermal conductivity of soil with temperature exhibits the opposite trend. This is mainly due to the competition between soil minerals and diesel, because the thermal conductivity of minerals increases with temperature, whereas the thermal conductivity of diesel decreases with temperature. The analysis results showed that, compared with temperature, the diesel concentration has more significant effects on soil thermal conductivity. Regardless of the diesel concentration, with the increase of temperature, the specific heat capacity of soil increases, while the thermal diffusivity of soil decreases. In addition, the results of a control experiment exhibited that the relative differences of the thermal conductivity of the soil samples containing the same concentration of both diesel and a pure alkane are all below 10%, indicating that the results obtained with diesel in this study can be extended to the family of PHs. A theoretical prediction model was proposed based on cubic fractal and thermal resistance analysis, which confirmed that diesel concentration does have a significant effect on soil thermal conductivity. For the sake of practical applications, a regression model with the diesel concentration as a primary parameter was also proposed.

Key words： contaminated soil; diesel concentration; thermal conductivity; specific heat capacity; thermal diffusivity; thermal desorption; fractal model

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