低碳化学与化工2023，Vol.48Issue(6)：163-169,7.DOI:10.12434/j.issn.2097-2547.20230030
气相管壁水合物沉积层分解破裂特性研究
Study on decomposition and fracture characteristics of hydrate deposition layer on gas-phase pipeline wall
摘要
Abstract
The decomposition and fracture characteristics of the natural gas hydrate(hereinafter referred to as"hydrate")deposit layer in the gas phase tube wall in the flow channel were studied,and its decomposition and fracture mechanism was defined,so as to provide a basis for the safety control of hydrate flow.In the process of the experiment,after the deposition layer was formed in the shaking test section,it was decomposed by depressurization method.The macroscopic morphological changes was observed and the decomposition rate was calculated,and the local decomposition was reflected by the change of the voltage signal collected by the probe.The experimental results show that the electrical signal-based detection method can be used as a novel means of monitoring decomposition.The deposition layer is decomposed in an ablation mode with shedding phenomena during depressurisation.During decompression,the sediment is decomposed in ablative mode with ablative phenomenon,and the ice is formed when the sediment decomposes at three decompression rates(0.010 MPa/s,0.026 MPa/s and 0.056 MPa/s).When the depressurization rates increase to 0.026 MPa/s to 0.056 MPa/s,the ice-hydrate mixed deposition layer falls off from the random location of the pipe wall.The shedding rate of the ice-hydrate mixed deposition layer increases with the depressurisation rate,bringing a risk of ice jamming.Finally,based on the experimental phenomena,the causes of shedding are summarized.One is the change of the structure of the deposition layer during the decomposition process.The other is the gas impact,which is the main reason for the shedding.关键词
天然气水合物/水合物沉积层/分解破裂特性/破裂脱落机制Key words
natural gas hydrate/hydrate deposit/decomposition fracture characteristic/rupture and detachment mechanism分类
能源科技引用本文复制引用
张佳璐,景红,魏江东,徐悦,朱弘宇,王武昌,李玉星..气相管壁水合物沉积层分解破裂特性研究[J].低碳化学与化工,2023,48(6):163-169,7.基金项目
国家自然科学基金重大项目(51991363) （51991363）
国家自然科学基金(51974349) （51974349）
国家自然科学基金联合基金(U19B2012). （U19B2012）
