基于增维精细积分法的单层垃圾体气体迁移分析

Analysis of landfill gas transport in a uniform MSW layer by using incrementdimensional precise integration

采用增维精细积分法对含覆盖层单层垃圾体一维气体迁移进行了瞬态分析.首先,对含覆盖层单层垃圾体的一维气体迁移控制方程进行有限差分离散,得到了其有限差分状态方程;然后,采用增维精细积分法建立了求解任一时刻垃圾体气压力的递推公式.计算结果表明:本文提出的增维精细积分解与校正-预测解吻合得相当好,而且受时间步长影响相对较小.

Transient analyses of one-dimensional landfill gas transport in a uniform municipal solid waste （ MSW） layer were carried out by using the method of increment-dimensional precise integration. Firstly,the governing equation for one dimensional landfill gas transport in a covered waste layer was discretized,and a finite difference state equation was derived. Secondly,the recurrence formula was established to determine the landfill gas pressure at any time by means of increment-dimensional precise integration. The computational results show that the increment-dimensional precise integration solution is consistent with the correction-forecast solution and the effect of the time step on the accuracy of the solution is insignificant.