-25~20℃温区柴油污染对土壤热导率的影响  

Effect of diesel pollution on soil thermal conductivity between-25~20ºC

作　　者：武岳飞 吴宇豪 范利武[1,2] 俞自涛[1,2] WU Yuefei;WU Yuhao;FAN Liwu;YU Zitao(College of Energy Engineering,Zhejiang University,Hangzhou 310027,China;State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]浙江大学能源工程学院热工与动力系统研究所,浙江杭州310027 [2]浙江大学能源高效清洁利用全国重点实验室,浙江杭州310027

出　　处：《能源工程》2025年第2期77-84,共8页Energy Engineering

基　　金：国家重点研发计划项目(2019YFC1805700);国家重点研发计划课题(2019YFC1805701)。

摘　　要：为了探究在-25~20℃这一较低温度范围内柴油和水同时赋存时土壤热导率的变化规律,以甘肃某有机污染修复示范场地的土壤样品为对象,利用自制的试验装置研究了质量含水率、柴油质量浓度和温度对土壤热导率的影响。向经过烘干、研磨、筛分和热脱附等预处理后的土壤中定量添加柴油和水,共制备了15个样品,其中含水率分别为3.5%、7.2%、11.1%、14.3%和18.0%,柴油浓度分别为0、5.0%和7.0%,并以每5℃为间隔进行测试。结果表明:土壤的热导率随着柴油浓度和初始含水率的提高而增大;由于土壤中的水结冰的影响,0℃以下时土壤的热导率大于0℃以上时土壤的热导率。当土壤温度从20℃降低到0℃时,土壤热导率缓慢减小。在冰水共存时,温度主要通过改变土壤中冰水比例来影响土壤的热导率,此时土壤热导率随着温度的降低而增大;当温度进一步下降,水全部冻结成冰后,土壤热导率趋于稳定。In order to explore the variation law of soil thermal conductivity when diesel and water coexist at the same time in the relatively low temperature range of-25~20ºC,based on a self-made apparatus,the soil samples in an organic-contaminated remediation site in Gansu Province were taken as the object,and the effects of mass water content,diesel mass concentration,and temperature on soil thermal conductivity were studied.After a series of pretreatments including drying,grinding,screening and thermal desorption,15 soil samples were prepared,with water content of 3.5%,7.2%,11.1%,14.3%and 18.0%,respectively,and diesel concentration of 0%,5.0%,and 7.0%,respectively.The thermal conductivity of the samples was measured at interval of 5ºC.The results showed that the increase of both diesel concentration and initial water content can increase the thermal conductivity of soil.Due to the effect of water freezing in soil,the thermal conductivity of the soil below 0ºC is greater than that above 0ºC.When temperature decreases from 20ºC to 0ºC,the thermal conductivity of soil decreases slowly.When ice and water coexist,the temperature mainly affects the thermal conductivity of soil by changing the proportion of ice and water in soil,and the thermal conductivity of the soil increases with the decrease of temperature.When temperature decreased further,that is,water all condenses into ice,the thermal conductivity of the soil tends to stabilize.

关 键 词：土壤 热导率 温度 柴油浓度 含水率 

分 类 号：TE991[石油与天然气工程—石油机械设备]