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研究论文

摘要：以多孔介质流体动力学理论为基础,在考虑填埋场内气体压力变化较小、相应气体密度变化小的情况下建立了填埋场释放气体运移数值模型.该模型具有适用范围广的特点,如边界形状任意、介质性质空间变化.模型中考虑了填埋场中介质含水量变化对气体运移的影响.利用本数值模型对无控制系统和有控制系统时释放气体运移进行了对比模拟分析,给出了有水平气体控制系统时的优化排气量并得出相应的释放气体收集率,可为填埋场释放气体控制系统的设计及环境影响预测和评价提供理论依据.

Abstract：Based on the theory of fluid dynamics in porous media, a numerical model of landfill gas migration is developed under presumption of small variation of air pressure, negligible change of gas density.This model is characterized with wider range of its availability, such as any shape of domain and space variation of media property at landfill site.The influence of water content of the media on landfill gas migration is taken into account.In this paper, the comparison and analysis of landfill gas migration simulation are presented in assumptions of with landfill gas control system and without landfill gas control system, and the optimal pumpage of gas pumping well is calculated, thus the ratio of landfill gas collection is given correspondingly.Hence it can provide basis for designing of landfill gas control system and for environmental impact prediction and assessment of landfill gas migration.