边界元法在填埋场气体运移数值模拟中的应用  

Application of boundary element method in numerical modeling of landfill gas migration

作　　者：陈家军[1] 解建波[1] 

机构地区：[1]环境模拟与污染控制国家重点联合实验室/北京师范大学,北京100875

出　　处：《环境科学学报》2008年第10期2141-2147,共7页Acta Scientiae Circumstantiae

基　　金：高等学校博士学科点专项基金(No.20050027002104012)~~

摘　　要：基于多孔介质流体动力学理论和边界元法原理,构建了填埋气运移边界元数值模型,进行填埋场内部填埋气的运动规律研究;通过与理想条件下的解析解对比分析,检验了该边界元数值模型方法本身;进行了垂直抽气井设施的填埋场实例气体运动数值模拟,得到了填埋场内部填埋气体的压力分布情况,由此确定了集气井的影响范围.模型精度分析和模型验证结果表明,该模型与解析解的平均相对误差在3%以下,与实测数据的平均相对误差均在10%左右,具有较高的精度;抽气井模拟结果表明,该模型可应用于填埋场气体运移的模拟预测和现场分析,能够为填埋场释放气体控制系统设计和优化提供理论依据.Based on the theory of fluid dynamics in porous media and the Boundary Element Method （BEM）, a numerical model of BEM was established to investigate the mechanisms of Landfill Gas （LFG） migration within a landfill site. The model was validated through comparison of the resultant numerical solution with the analytical solution under ideal conditions. Numerical modeling of LFG migration with a vertical extraction well was conducted. Gas pressure distribution within the landfill site was obtained; subsequently, the radius of influence of the extraction well was determined. The results of accuracy analysis showed good accuracy for the model with average relative errors of less than 3% and approximately 10% compared with the analytical solution and in-situ monitored data, respectively. The good accuracy indicates that the model can be applied in prediction of in-situ LFG migration and can provide a theoretical basis for landfill gas control system design and optimization.

关 键 词：垃圾填埋气 边界元 气体运移 数值模拟 

分 类 号：X32[环境科学与工程—环境工程]