Abstract A combination of thermal stimulation and CH4/CO2 replacement methods in the presence of nanoparticles was employed to enhance CH4 recovery and CO2 storage for a previously formed CH4 hydrate in a reactor. To this end, first, the effects of different CO2 injection pressures and CO2 hydrate formation temperatures were examined on the replacement process, and the optimum condition was obtained among the studied P-T conditions. In the second stage, silica and zinc oxide nanoparticles were added to the system to explore the influence of the nanomaterials on CH4 recovery and CO2 storage under the optimum conditions. The results indicated that the optimum methane recovery condition was 45 bar and 8 °C. Further, the efficiency of the combined method was enhanced significantly in the presence of nanoparticles. According to the results, the methane recoveries of 37.7% and 51.9% plus the CO2 storages of 54.6% and 68.4% were obtained in the presence of silica and zinc oxide nanoparticles, respectively. This study could be helpful to introduce a new approach for enhancing CH4 recovery from hydrate resources.

中文翻译：

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在 SiO2 和 ZnO 纳米粒子存在下使用组合 CH4/CO2 置换和热刺激方法从天然气水合物生产甲烷的实验研究

摘要 在纳米粒子的存在下，热刺激和 CH4/CO2 置换方法的组合被用于提高反应器中先前形成的 CH4 水合物的 CH4 回收和 CO2 储存。为此，首先研究了不同CO2注入压力和CO2水合物形成温度对置换过程的影响，并在研究的PT条件中获得了最佳条件。在第二阶段，将二氧化硅和氧化锌纳米粒子添加到系统中，以探索纳米材料在最佳条件下对 CH4 回收和 CO2 储存的影响。结果表明，最佳甲烷回收条件为 45 bar 和 8 °C。此外，在纳米粒子的存在下，组合方法的效率显着提高。根据结果​​，在二氧化硅和氧化锌纳米粒子的存在下，甲烷回收率分别为 37.7% 和 51.9%，加上二氧化碳储存量为 54.6% 和 68.4%。这项研究可能有助于引入一种新的方法来提高水合物资源中 CH4 的回收率。