填埋场好氧稳定化通风系统设计研究及实践

Design and Practice of Aerobic Stabilized Ventilation System of Landfill Sites

对填埋场好氧稳定化领域通风量的计算方法和布井间距经验值进行了汇总,提出了双井压差-影响半径模型,探索了抽气井和注汽井间气体压力差与影响半径的关系。并通过某山西项目运行监测数据,检验了通风量计算方法适用性和布井间距最佳值。结果表明:BDM计算法结果偏大,导致气体带出热量而使堆体升温困难;25 m的布井间距经验值对于研究对象来说偏小;对于与本项目类似的填埋场,孔隙率计算法得到的通风量更适合堆体降解,此外,布井间距可参考双井压差-影响半径模型,以25 m为基础适当加大。

In this paper,the calculation methods of aeration and the empirical values of well spacing are summarized,and a two-well pressure-influence radius model is proposed to explore the relationship between the gas pressure difference and the influence radius between the pumping well and injection well.Through the operation monitoring data of a Shanxi project,the applicability of the calculation methods of ventilation volume and the optimum value of well spacing are tested.The results show that:the result of BDM method is too large,which leads to the heat removal and makes it difficult to heat up the reactor;the empirical value of 25m well spacing is small for this project;for landfill sites similar to this project,the ventilation rate obtained by porosity method is more suitable;in addition,well spacing can be appropriately increased based on 25m by referring to the dual-well pressure-influence radius model.