微波强化分解甲烷水合物的研究

Intensification of Methane Hydrate Dissociation by Microwave Radiation

通过2.45GHz微波辐射实验,研究了甲烷水合物在微波电磁场中的稳定性和加热分解规律。实验结果表明,利用微波强化分解甲烷水合物主要依靠热效应,甲烷水合物自身的动力学非稳定条件及液态水协同增强热效应是微波热激法的作用条件。对于未冷冻且未降压的甲烷水合物/水体系微波作用效果最佳,应先微波加热后再结合降压分解。冷冻后未降压的甲烷水合物/冰体系的分解造成介电损耗的急剧变化,分解速率和微波加热速率显著改善。冷冻后降压的甲烷水合物/冰体系在微波场中仍处于极低分解速率的自保护区域,不适宜微波分解。

The stability and the dissociation process of methane hydrate were experimentally studied under 2.45 GHz microwave radiation. The results showed that intensification of the dissociation by microwave radiation depended on the thermal effect, and the dynamical instability of the methane hydrate and its synergistic thermal effect with liquid water were the microwave stimulation preconditions. The dissociation by microwave heating was better for the hydrate/water system without depressurization and freezing. Conducting the microwave heating before depressurization was proposed. The melting of the methane hydrate/ice system led to dramatic variation of the dielectric loss, as a result the dissociation rate and the microwave heating rate were improved. The frozen and depressurized methane hydrate existed in a self-preservation region with very low dissociation rate, which was unsuitable for the microwave dissociation.