摘要
水合物的生长和分解规律对开发海洋天然气水合物资源,实现深水天然气水合物气液固多相管道输送都具有重要意义。为了进一步揭示水合物的生长和分解特性,本文采用高压全透明反应釜装置,进行了温度0~30℃、压力3.35~8.16MPa和搅拌速率200~1000r/min范围内的16组甲烷水合物生长和分解动力学实验研究。结果表明:实验过程可分为水合物诱导期、快速生长期、缓慢生长期以及分解期这4个阶段。在水合物快速生长阶段,获得了温度、压力、搅拌电机扭矩和水合物生长速率随时间的变化规律,观察到了水合物颗粒的均相和非均相分布状态。通过加热促使水合物分解,揭示了分解阶段温度、压力和分解速率等关键参数的变化规律以及水合物块的分解形态。分析表明,水合物颗粒的分布状态与水合物浆液的流动性直接相关;水合物块的静态分解过程受到分解气传质控制。
The kinetics of hydrate growth and dissociation are of great significance to the exploitation of natural gas hydrate resources in the ocean and the transportation of hydrate slurry through deep water pipelines in the form of multiphase flow.In order to further uncover the characteristics of gas hydrate growth and dissociation,16 groups of hydrate growth and dissociation experiments were conducted using a high-pressure transparent autoclave in this work,with temperature 0-30℃,pressure 3.35-8.16MPa and stirring rate 200-1000r/min.Based on our observation,the experiment process was divided into four stages:induction stage,fast growing stage,slow growing stage and dissociation stage.The variation of the experimental temperature,pressure,torque of the mixing motor and hydrate growth rate was emphatically analyzed during the hydrate fast growing stage.We also observed the homogeneous and heterogeneous distribution patterns of hydrate particles,which were not commonly published in previous studies.By heating,the hydrate blocks dissociated statically in the autoclave.The variation of key parameters,such as system temperature,pressure and dissociation rate were revealed.The fully dissociation morphology of hydrate blocks were also recorded.Analysis showed that the distribution of hydrate particles had an obvious connection with the flow property of hydrate slurry and the static dissociation process of hydrate blocks was mainly controlled by the mass transfer rate of the released gas from hydrate clathrate structures.
作者
黄婷
李长俊
李清平
丁麟
AMAN Zachary M
HUANG Ting;LI Changjun;LI Qingping;DING Ling;AMAN Zachary M(CNOOC Research Institute Company Limited,Beijing 100028,China;State Key Laboratory of Natural Gas Hydrate,Beijing 100028,China;School of Petroleum and Natural Gas Engineering,Southwest Petroleum University,Chengdu 610500,Sichun,China;PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China;School of Mechanical and Chemical Engineering,The University of Western Australia,Perth 6009,Australia)
出处
《化工进展》
EI
CAS
CSCD
北大核心
2020年第7期2624-2631,共8页
Chemical Industry and Engineering Progress
基金
国家自然科学基金(51474184,51974269)
国家重点研发计划(2016YFC0.04000)
中海石油(中国)有限公司科技课题(2019-KJYFPT-002)。
关键词
水合物
动力学
生长
分解
甲烷
扭矩
gas hydrate
kinetics
growth
dissociation
methane gas
torque
