摘要
在混合模型理论基础上,建立LPG(liquefied petroleum gas)在非饱和砂土中渗流扩散的传热、传质模型,研究LPG埋地储罐在砂土介质中发生泄漏时LPG渗流扩散的物理过程。该模型综合考虑了LPG泄漏相态、重力、黏滞力、毛细压力、扩散、非达西效应、气液相之间相互作用等影响因素的作用;在Forchheimer方程基础上,推导出多相混合流的非达西流动方程,并根据LPG实际渗流过程中流动状态的变化,将多相流非达西系数根据Reynolds数变化进行相应的改变,实现对多相流体从非达西流动向达西流动的转变现象的描述,能够模拟多种流动状态变化,扩展了模型的适用范围;根据LPG不溶于水的特性,简化了组分方程,推导出LPG体积浓度计算式。该模型能描述LPG埋地储罐泄漏后在砂土中流动趋势和对周围造成的影响,为埋地储罐场地选取、周边区域规划和事故预防、预测、应急提供依据。
The physical process of LPG （liquefied petroleum gas） flow dispersion in porous media for the releases at vapor and liquid regions of LPG UST （underground storage tank） was analyzed. On the basis of the mixture model principle, a mathematical model was developed to describe the heat and mass transfer of LPG in porous environment. A series of factors including the LPG phase state, gravity, capillary force, viscous force, gas-liquid interaction and interior resistance of porous media were considered in this model. Based on the Forchheimer equation, the non-Darcy flow equation of the multiphase mixture was presented. The relationship of non-Darcy coefficient and Reynolds number was considered, which could describe the transition of LPG flow in unsaturated porous media from multiphase non-Darcy flow to Darcy flow and extend the scope of model application. Based on the insolubility of LPG in water, the formulation of LPG volumetric concentration was deduced. The model could lead to a good understanding of flow development and impact on environment of LPG in unsaturated porous media and would be a good guidance for site selection, regional planning, and forecasting and prevention of LPG UST accidents.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2008年第9期2163-2167,共5页
CIESC Journal
基金
广东省科技攻关项目(2005B32401008)~~
