摘要：Hydrate reformation and silt deposition blockage in pipelines are key issues affecting combustible ice mining, and seawater in pipelines has a certain degree of salinity. Therefore, this study used a high-pressure loop to carry out water-silt-NaCl-CH4 system hydrate formation and hydrate-silt deposition experiments. The experiments revealed a four-stage evolution process from hydrate formation to stable solid-phase deposition. The study found that in a saline system containing sand, the induction time of hydrate formation can be significantly extended by 2-3 times compared to that in a pure water system. This extension is particularly notable under conditions of low sand concentration (0.1%(mass)) and high flow rate (1600 kg/h), reaching a maximum of 3.3 times. This is because of that the disruption of water molecule cluster structures by NaCl and sand is a crucial mechanism inhibiting hydrate nucleation. Furthermore, NaCl compresses the thickness of the particle鈥檚 double electric layer, weakening the hydrophilicity of sand particles. This, coupled with nanobubble bridging, prompts the aggregation of solid particles and their adhesion to the pipe wall, accelerating the formation of hydrate-sand deposition layers. The research findings contribute to ensuring the safety and stability of multiphase flow in the exploitation and production system for combustible ice development. 漏 2024 Materials China. All rights reserved.

ISSN号：0438-1157

卷、期、页：v 75,n 5,p1987-2000

发表日期：2024-05-25

收录情况：EI（工程索引）

发表期刊名称：Huagong Xuebao/CIESC Journal

参与作者：黄婷,雍宇

通讯作者：刘礼豪,罗昕浩,赵泽明

第一作者：宋尚飞,史博会,陈光进,宫敬

论文类型：期刊论文

论文概要：刘礼豪,黄婷,雍宇,罗昕浩,赵泽明,宋尚飞,史博会,陈光进,宫敬，CH4-hydrate formation and solid-phase deposition in salt-sand coexisting flow systems，Huagong Xuebao/CIESC Journal，2024，v 75,n 5,p1987-2000

论文题目：CH4-hydrate formation and solid-phase deposition in salt-sand coexisting flow systems