污染场地原位热修复技术与能效分析

doi:10.13745/j.esf.sf.2022.1.42

摘要/Abstract

摘要：

本文围绕原位热修复技术所存在的有效性和能耗难以评估的问题,基于原位热修复技术机制、影响因素、能效等方面进行系统分析,揭示原位热修复技术热量传递和污染物驱动机制,探讨热导率和电导率等原位热修复能效的影响因素;基于电阻加热(ERH)修复技术原位中试研究,分析了ERH系统的加热性能和该场地加热0100 d的温度场时空分布,解析温度空间分布差异的原因。研究表明,ERH存在电阻发热和电极井热传导两种机制,加热效率受电极井距离和地层环境影响,热量散失是未来原位热修复技术能效评估应关注和研究的因素。

关键词: 污染场地, 原位热修复, 电阻加热, 温度分布, 能效评估

Abstract:

To address the difficulties associated with the effectiveness and efficiency assessments of in-situ thermal remediation (ISTR) technology, this study analyzed and revealed the principals of heat transfer and pollutant removal, the key influencing factors such as thermal conductivity and electrical conductivity, and the energy efficiency of ISTR. Based on the pilot-scale implementation of in-situ electrical resistance heating (ERH) remediation technology at a contaminated site, heating performance of the ERH system and the spatio-temporal distribution of the temperature field were analyzed. Further, the causes of spatial variation of temperature were investigated. According to the analysis, the site was heated primarily via electrical resistance heating and thermal conduction by the electrode well. The heating efficiency was affected by the electrode well distance and site lithological characteristics. Heat loss to the surface and around is a key factor for future energy efficiency assessment of ISTR technology.

Key words: contaminated sites, in-situ thermal remediation, electrical resistance heating, temperature distribution, assessment of energy efficiency

中图分类号:

张小刚, 张芳, 李书鹏, 韦云霄, 侯德义, 李广贺. 污染场地原位热修复技术与能效分析[J]. 地学前缘, 2022, 29(3): 200-206.

ZHANG Xiaogang, ZHANG Fang, LI Shupeng, WEI Yunxiao, HOU Deyi, LI Guanghe. Application and energy efficiency analysis of in-situ thermal remediation technology for contaminated sites[J]. Earth Science Frontiers, 2022, 29(3): 200-206.

图/表 7

图1 原位热修复技术应用态势图(引自文献[8])

Fig.1 Trends in ISTR technology applications. Adapted from [8].

图2 氯代溶剂在地层环境中的四相分布(引自文献[27])

Fig.2 Four-phase partition of chlorinated solvents in formation media. Adapted from [27].

图3 ERH原位热修复系统和井位布设图(引自文献[48])

Fig.3 In-situ electrical resistance heating remediation system and well pattern designs. Adapted from [48].

图4 电极井设计剖面图(引自文献[48])

Fig.4 Electrode well design profile. Adapted from [48].

图5 热修复系统温度场分布图(100 d)

Fig.5 Temperature field distribution in the ERH remediation system after 100-day continual operation

图6 T1-T4测温点各深度升温速率

Fig.6 Heating rates at T1-T4 temperature monitoring points at different depths

表1 不同深度地层岩性和平均土壤饱和度

Table 1 Stratigraphic lithology and average soil saturation at different depths

深度/m	地层岩性	平均土壤饱和度/%
3.5	粉土	93.1
5.5	黏土	94.4
7.5	粉质黏土	93.8

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