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天然气水合物是潜在的清洁能源,储量巨大.高效开发利用天然气水合物,具有重要意义.微波加热作用速度快,应用比较灵活,有希望用于开采各类型天然气水合物资源及水合物储运技术.实验研究了2450MHz、不同微波功率下天然气水合物的形成/分解过程,初步分析了微波对天然气水合物相平衡的影响,并在van der Waals-Platteeuw模型的基础上进行了计算.结果表明:一定功率的微波可降低水合物形成的过冷度和诱导时间,20W微波状况下,过冷度减小约3℃,诱导时间由4.5h缩短到1.3h;发现微波可使水合物快速分解,随着水合物的分解,产生的分解水加速了水合物的分解,分解水与微波具有协同作用;相同压力下,微波可提高水合物的相平衡温度.天然气水合物分解过程中各组分介电性质的差异造成了反应体系在分解过程中存在显著的温度差异,微波加热分解水合物存在多种因素的共同作用.
Natural gas hydrate is a potential clean energy with huge reserves and it is of great significance to develop and utilize natural gas hydrate efficiently.Microwave heating is fast and flexible in application and promising for exploitation of various types of natural gas hydrate resources and hydrate storage and transportation technologies The formation and decomposition process of natural gas hydrate at 2450MHz and different microwave power were studied experimentally and the effects of microwave on the phase equilibrium of natural gas hydrate were analyzed preliminarily.The results of van der Waals-Platteeuw model show that: Microwave at a certain power can reduce the degree of supercooling and induction time of hydrate formation. Under 20W microwave condition, the degree of undercooling decreases by about 3 ℃ and the induction time decreases from 4.5h to 1.3h. It is found that microwave can decompose hydrate rapidly, With the decomposition of hydrates, the resulting decomposition of water accelerates the decomposition of hydrates, decomposition of water and microwave synergy; the same pressure, microwave can increase the phase equilibrium temperature of hydrate. Gas hydrate decomposition process of the various components Differences in electrical properties caused by the reaction system in the decomposition process there is a significant temperature difference, there are a variety of microwave heating decomposition of hydrate Effect.