管道流动体系下天然气水合物生成模型的研究进展

管道流动体系下天然气水合物生成模型的建立对天然气水合物浆液的输送、管输天然气水合物防治以及天然气水合物技术的应用都具有重要意义。为此,查阅了大量的国内外相关文献并进行了总结与分析,认识到目前对该类模型的研究较少,现有的模型也是在静态釜式反应器天然气水合物生成理论基础上拓展而来的,主要包括驱动力、成核速率、诱导时间、水合物生长等方面的模型,上述模型被广大研究者用于计算管道单个截面处天然气水合物的生成速率预测,具有较好的计算精度。但现有模型用于管道流动体系下天然气水合物生成特性的预测还不成熟,需要进一步开展管道流动体系下天然气水合物的生成机理、管道沿线温度变化、添加剂及其流动界面对气液传质的影响等研究,建立动力学、传热、传质三者相结合的管道流动体系下天然气水合物生成模型,以此来解决管道流动体系下天然气水合物生成预测的技术难题。

Research progress in the natural gas hydrate formation model under the pipe flow system

The establishment of the natural gas hydrate formation model under the system of pipe flow is of significance to hydrate slurry transportation, pipeline gas hydrate prevention and control, and the application of hydrate related technologies. In view of this, according to a great number of domestic and foreign literatures, few studies have been found about the said model and the existing models are mostly based upon the theory of hydrate formation in the static reactor, such as driving force model, nucleation rate model, induction time model and hydrate growth model, etc. Many scholars use these models to calculate the rate of hydrate formation at a single pipe cross section with a high calculation accuracy. However, the existing models for predicting the characteristics of hydrate formation under the system of pipe flow are not mature enough so that further studies are still needed on the hydrate formation mechanism under the system of pipe flow and the impacts of environmental temperature changes, additives and the flow interface on the gas liquid mass transfer in line pipes, etc. Considering the dynamics, heat transfer, mass transfer and other factors, the hydrate formation model under the system of pipe flow is the key to the problem of predicting hydrate formation in such a case.