蒸汽注入法中蒸汽迁移的影响因素及其修复菲污染土壤的实验研究

Experimental Study on the Influencing Factors of Steam Migration in Steam Injection and Its Remediation of Phenanthrene Contaminated Soil

蒸汽注入法因其能量利用率高和成本较低等优势在有机污染场地修复中具有良好应用前景。探究热修复技术中蒸汽的迁移、升温过程和影响因素是提高蒸汽注入能效的重点。本研究通过蒸汽注入模拟装置实验研究发现,保温能有效提高热蒸汽的热量利用率。蒸汽注入的流量越大,蒸汽在渗透系数高的介质中迁移速度更快,通过热对流和热传导所传递的热量也越多,体系的升温时间越短。蒸汽注入法对土壤中多环芳烃菲有良好的去除效果。在实际工程应用中需综合考虑场地污染状况、项目工期和项目成本来确定合适的技术工艺参数。

The steam injection method has good prospects for application in remediation of organic contaminated sites due to its advantages of high energy efficiency and low cost.Investigating the steam migration,heating processes and influencing factors in thermal remediation technology is the key points of improving the energy efficiency of steam injection.In this study,we found that thermal insulation can effectively improve the heat utilization of hot steam through the experimental study of steam injection simulation device.The higher the flow rate of steam injection,the faster the migration of steam in media with high permeability,the more heat is transferred through thermal convection and heat conduction,and the shorter the heating time of the system.The steam injection method has good effect on the removal of PAHs from soil.In the actual engineering application,the site contamination status,project duration and project cost need to be considered to determine the appropriate technical process parameters.