硝酸熔盐在土壤中的泄漏实验与模拟  

The Experiment and Simulation of Nitrate Molten Salt Leakage in Soil

作　　者：张媛媛 丁静[1] 陆建峰[1] 吴谨巧 ZHANG Yuan-Yuan;DING Jing;LU Jian-Feng;WU Jin-Qiao(School of Engineering,Sun Yat-Sen University,Guangzhou 510006,China)

机构地区：[1]中山大学工学院

出　　处：《工程热物理学报》2019年第8期1881-1885,共5页Journal of Engineering Thermophysics

基　　金：国家重点研发计划项目(No.2017YFB0603501);国家自然科学基金项目(No.U1601215;No.51476190);广东省自然科学基金项目(No.2017B030308004)

摘　　要：熔盐是各种高温工业系统中重要的传热储热介质,但其泄漏和污染很少被研究。本文基于硝酸熔盐实验系统与结果建立多孔体系中多相传热传质模型研究硝酸熔盐在土壤中的迁移和相变现象及特征。在泄漏阶段,熔盐在土壤表面扩散,在土壤内迁移并开始固化;在泄漏后阶段,熔盐逐渐凝固为固体层。凝固使泄漏熔盐存在最大泄漏半径和泄漏深度,可限制环境污染范围。初始泄漏温度越高,熔盐最大泄漏半径和深度均增加,而初始泄漏速度、时间或泄漏量增加主要增大最大泄漏半径。Molten salt is an important medium for heat transfer and heat storage in various high-tempeTature industrial systems,but its leakage and pollution are seldom studied.In this paper,the multiphase heat and mass transfer model in porous system was established to study the migration and phase transition phenomena and characteristics of nitrate molten salt in soil.During the leaking process,the molten salt diffuses on the soil surface,migrates in soil and begins to solidify as a solid layer during the post-leaking stage.Solidification makes the existence of maximum leakage radius and leakage depth,which can limit the range of environmental pollution.The initial leakage temperature rises,the maximum radius and depth of molten salt both increase;when the initial leakage rate and leakage time or the leakage increase,mainly the maximum leakage radius increases.

关 键 词：太阳能热利用 硝酸熔盐 泄漏 多相流 固液相变 

分 类 号：TK513.5[动力工程及工程热物理—热能工程]