摘要：Carbon capture, utilization and storage are facilitated through carbon dioxide (CO2) transport. Pipe transportation is the main method for transporting CO2. However, hydrate blockages reduce transport efficiency in the pipelines, and the throttling devices are the main location of hydrate blockages. In this paper, the mechanism of hydrate formation in the throttling of CO2-containing trace moisture was investigated. The throttling device in a pipe was mimicked using a cylindrical orifice plate. The work also studied the effects of moisture content, upstream pressure and upstream temperature on hydrate formation. The results indicate that the Joule-Thomson cooling effect is a key contributor, and promotes the condensation of trace moisture, resulting in the free water necessary for hydrate nucleation. Under the effect of gas flow back-mixing, it is easy for the hydrate to adhere to the inner surface of the pipe behind the orifice plate. When the moisture content in the gas increases from 123 mu mol/mol to 1024 mu mol/mol, the hydrate induction time decreases from infinity to 792 s. However, the moisture content has no effect on the adhesion strength of the hydrate to the inner surface of the pipe. When the initial upstream pressure increases from 2.0 MPa to 3.5 MPa, the hydrate induction time decreases from infinity to 306 s. When the upstream temperature decreases from 291.15 K to 285.15 K, the hydrate induction time decreases from infinity to 330 s. With the decrease in the initial upstream temperature, the adhesion of hydrate particles to the inner surface of the pipe is promoted. This study provides experimental evidence for the characteristics of hydrate formation in the process of CO2 throttling.

关键字：carbon dioxide; moisture; hydrate; mechanisms; throttling

卷、期、页：卷: 12期: 12

发表日期：2024-12-01

期刊分区（SCI为中科院分区）：四区

收录情况：SCIE（科学引文索引网络版）

发表期刊名称：PROCESSES

通讯作者：徐文磊,戴泽利,曹嵘,孟丽娜

第一作者：徐振,刘曾奇,王逸伟,孙强,陈建义,郭绪强

论文类型：期刊论文

论文概要：徐振,徐文磊,戴泽利,曹嵘,孟丽娜,刘曾奇,王逸伟,孙强,陈建义,郭绪强，An Experimental Investigation of the Hydrate Formation Mechanism in the Throttling of Carbon Dioxide-Containing Trace Moisture，PROCESSES，2024，卷: 12期: 12

论文题目：An Experimental Investigation of the Hydrate Formation Mechanism in the Throttling of Carbon Dioxide-Containing Trace Moisture