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随着天然气水合物开采及开发技术研究的不断发展,水合物的宏观流动特性研究成为保证天然气水合物顺利输送的必要条件。为此,对天然气水合物在管道中的稳定流动状态及临界堵塞条件进行了研究,以传统的固液双层流动模型为基础,结合天然气水合物在水平管道中的流动特点,提出了天然气水合物稳定流动的判定标准——临界流动速度和临界床层高度,即管道内出现固定床层的临界速度和该速度对应的床层高度;并提出了计算天然气水合物流型及流动参数的方法。在此基础上,对天然气水合物在管道中流动的沉积特性进行了研究,设计正交方案,对比了不同因素对临界沉积速度的影响因子。实验验证结果表明:该方法可以较为准确地描述天然气水合物的流动状态及其特征参数,对判断其安全流动具有一定的指导意义。
With the development of natural gas hydrate exploration and development technology, the study on the macroscopic flow characteristics of hydrates has become a necessary condition to ensure the smooth transportation of natural gas hydrate. Therefore, the steady state of gas hydrate in pipeline and its critical clogging conditions are studied. Based on the traditional solid-liquid two-layer flow model and combined with the flow characteristics of natural gas hydrate in horizontal pipe, gas hydration The criteria for the steady flow of material - the critical flow velocity and the critical bed height, that is, the critical velocity of the fixed bed in the pipeline and the bed height corresponding to this velocity, and the method of calculating the gas hydrate flow pattern and the flow parameters are proposed. On this basis, the deposition characteristics of natural gas hydrate flowing in pipelines were studied, and the orthogonal scheme was designed. The influence factors of different factors on critical deposition velocity were compared. Experimental results show that this method can describe the gas hydrate flow state and its characteristic parameters more accurately, which is of guiding significance for judging the safe flow of gas hydrate.