In situ thermal treatment (ISTT) technologies can be used to remove mass from non-aqueous phase liquid (NAPL) source zones. Ensuring the vaporization of NAPL and the capture of vapors are crucial, and numerical models are useful for understanding the processes that affect performance to help improve design and operation. In this paper, a two-dimensional model that combines a continuum approach based on finite difference for heat transfer with a macroscopic invasion percolation (macro-IP) approach for gas migration was developed to simulate thermal conductive heating (TCH) applications at the field-scale. This approach simulates heat transport and gas migration, but is different than a traditional continuum multiphase approach. Mass recovery for 60 randomly generated realizations under three degrees of heterogeneity of the permeability field were simulated. The mass recovery curves had an overall similar shape for the various permeability fields. However, a wider range of completion times was observed for domains with a higher permeability variance. Results also showed that NAPL pools that were highly saturated, deep, and away from the heaters needed more heating time to be depleted, and that total NAPL mass was not a good indicator of completion time. The completion time was positively correlated with the maximum value of the mixed spatial moment of NAPL saturation about the heaters in the lateral and vertical direction, and the NAPL pool with the highest moment could increase the heating time by as much as 35%. This effect was most notable in simulations with a high permeability variance and suggests the potential to reduce heating time by locating the largest NAPL pools and placing TCH heaters accordingly.

原位热处理（ISTT）技术可用于去除非水相液体（NAPL）源区域中的物质。确保NAPL的汽化和蒸汽的捕集至关重要，数值模型对于理解影响性能的过程很有用，有助于改善设计和操作。在本文中，开发了一个二维模型，该模型将基于有限差分进行传热的连续介质方法与用于气体迁移的宏观入侵渗滤（macro-IP）方法相结合，以模拟现场热传导加热（TCH）的应用。规模。该方法模拟了热传递和气体迁移，但是不同于传统的连续多相方法。在渗透率场的非均质性的三个非均质度下，模拟了60个随机生成的实现的质量恢复。对于各种渗透率场，质量回收曲线具有总体上相似的形状。但是，对于渗透率差异较大的区域，观察到的完成时间范围更广。结果还表明，高度饱和，深且远离加热器的NAPL池需要消耗更多的加热时间，并且总NAPL质量不是完成时间的良好指标。完成时间与加热器在横向和垂直方向上NAPL饱和混合空间矩的最大值呈正相关，具有最大矩的NAPL池可将加热时间最多增加35％。