化工学报2025，Vol.76Issue(11)：5554-5573,20.DOI:10.11949/0438-1157.20250484
基于CFD-DEM的水基体系水合物流动聚集与沉积过程模拟研究
Numerical study on flow aggregation and deposition processes of hydrates in water-based systems using CFD-DEM
摘要
Abstract
In deepwater oil and gas and"combustible ice"development,particle deposition and aggregate blockage in hydrate slurries are key challenges in flow assurance.This study conducts numerical simulations of flow aggregation and deposition processes of NGH slurries in water-based systems using the coupling of computational fluid dynamics(CFD)and discrete element method(DEM)via Fluent and EDEM.The research investigates the aggregation and deposition behaviors of hydrate particles under different slurry velocities and hydrate volume fractions,and the pressure changes inside the pipeline under conditions with and without particles are compared and analyzed.The simulation results show that at a low velocity of 0.5 m/s,particles form a stationary deposition layer on the pipeline inner wall,accompanied by significant axial and radial aggregation.At a higher velocity of 1.5 m/s,enhanced shear forces fragment particle aggregates,leading to uniform dispersion of single particles or small aggregates.As the hydrate volume fraction increases from 5％to 15％,the degree of particle aggregation intensifies,causing a nonlinear increase in pressure drop,and a pressure drop peak is formed in the middle section of the elbow due to the development of the deposition layer.Based on the simulation results,this paper proposes a mechanism for the influence of bend structure on hydrate deposition:at low flow rates,the fluid and particles are coupled.After hydrate aggregates break up at the flow field abrupt change,some of them adhere to the sedimentary layer on the pipe wall,forming a coupled blockage mechanism of adhesion,fragmentation,and redeposition.关键词
多相流/水合物/聚集/CFD-DEM/沉积物Key words
multiphase flow/hydrates/aggregation/CFD-DEM/deposition分类
能源科技引用本文复制引用
史博会,刘光硕,郭恩岐,史潇航,刘浩田,吴海浩,李晓平,宋尚飞,宫敬..基于CFD-DEM的水基体系水合物流动聚集与沉积过程模拟研究[J].化工学报,2025,76(11):5554-5573,20.基金项目
国家重点研发计划项目(2022YFC2806203) （2022YFC2806203）
国家自然科学基金项目(52104069,U20B6005) （52104069,U20B6005）
北京市自然科学基金面上项目(3232030) （3232030）
中国博士后科学基金面上项目(2022M713460) （2022M713460）
中国石油大学(北京)科研基金资助项目(2462023BJRC018,2462020YXZZ045) （北京）
