温度作用下填埋垃圾气体运移规律的研究

Research into transport law of landfill gas under temperature effect

温度对填埋气体在多孔介质中的储存和释放过程有着重要影响。基于多孔介质渗流力学-热力学理论,考虑气体密度随压力变化影响条件下,建立了垃圾填埋垃圾气体运移过程的耦合动力学数学模型。并采用特征线有限元方法对数学模型进行离散。该数值模型可为预测和预报污染物在土壤中的扩散状况以及污染气体的排放和收集、防止二次污染提供了可靠的理论依据。

Temperature has a great effect on landfill gas transport, release and deposit. Based on the theory of mechanics of porous seepage and thermodynamics, a numerical coupling model of landfill gas transport in landfill has been established under the presupposition of gas density change due to pressure variation, and the model is discreted by characteristic finite element method. The numerical visualization simulation on the distribution law of gas pressure is developed under temperature effect. The theory provides theorectical basis for forecasting diffusion of landfill gas in soil and pollution control. Thus it is of significance in theory and practice value for the protection of environment and utilization of underground water resource.