碳酸冰替代甲烷水合物封堵管道的实验研究

J. Yamamoto, Marcio Yamamoto, Y. Nakajima, Satoru Takano, S. Kanada, Masao Ono, Kazuhisa Otsubo
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引用次数: 0

摘要

在日本专属经济区海底发现了大量的甲烷水合物。在甲烷水合物输送过程中,由于甲烷水合物的重整和海水的冻结,引起了立管或管线的堵塞,引起了人们的关注。甲烷水合物的降解和重整动力学主要受系统内温度、压力和甲烷浓度的控制;然而,这些因素在多相流中由于受到流体力学和传热的影响而难以预测。为了获得降解动力学的实验数据,我们开发了一个闭环实验装置,该装置由作为热交换器的夹套管、三个观察流动的丙烯酸单元和一个泥浆泵组成。循环实验中连续测量装置内的流量、盐度、温度和压力。实验结果表明,管道内流体的冻结状态受管道外部温度或流体中颗粒的影响。本文报告了在几种情况下获得的一些实验数据,包括在冻结条件下进行的实验数据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Experimental Study on Plugging Inside a Pipe Using Carbonated Ice as a Substitute for Methane Hydrate
Methane hydrate has been found below the seafloor in the Exclusive Economic Zone (EEZ) of Japan in a large amount. During the methane hydrate transportation, it is concerned that the riser pipe or the flowline can be plugged by the hydrate reformation and the freezing of seawater. The degradation and reformation kinetics of methane hydrate are mainly controlled by temperature, pressure, and methane concentration in the system; however, it is difficult to predict these factors in the multiphase flow because they are affected by fluid dynamics and heat transfer. To obtain the experimental data of the degradation kinetics, we developed a closed-loop experimental apparatus consisting of jacketed tubings used as heat exchangers, three acrylic units to observe the flow, and a slurry pump. The flow rate, salinity, temperature, and pressure in the apparatus were continuously measured in the circulation experiments. The experiment results showed that the freezing condition of the fluid in the pipe is affected by the temperature of the outside of the pipe or the particle in the fluid. This paper reports some experimental data obtained in several cases, including those conducted under freezing conditions.
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