摘要
针对天然气水合物的喷雾法制备,设计并搭建了悬垂水滴显微实验装置,研究了不同温度和压力条件下天然气水合物在悬垂水滴表面的生长形态,建立了水滴表面水合物膜的生长模型,并通过实验研究了驱动力、过冷度、水合反应速率、气体扩散速率及十二烷基硫酸钠(SDS)浓度对水合物膜生长的影响.结果表明,水合物膜的生长速率随过冷度的增加而增加,实验条件下测得水滴表面水合物膜的生长率为0.24～0.39μm/s.水滴表面水合物膜的生长为内扩散控制,水合物的活化能为13.01kJ/mol.当SDS浓度为550mg/L时,界面反应速率常数有最大值0.0027m/s.
Aiming at the water spray formation of natural gas hydrate, a set of experimental apparatus was designed and built to study the natural gas hydrate formation on the pendant water droplet, the growth morphology of gas hydrate on the pendant water droplet under different pressures and temperatures was observed. The growth model of hydrate film on the surface of water droplet was established, and the effects of driving force, subcooling, hydration reaction rate, gas diffusivity and sodium dodecyl sulfate （SDS） concentration on the hydrate film growth were investigated. The results showed that the growth rate of hydrate film increased with the increase of subcooling degree, the measured growth rate was between 0.24 and 0.39 ~tm/s. The hydrate growth was inside diffusion control, the activation energy of natural gas hydrate was 13.01 kJ/mol. The reaction rate constant on the reaction interface had the maximum value of 0.0027 m/s with SDS concentration in 550 mg/L.
出处
《过程工程学报》
EI
CAS
CSCD
北大核心
2008年第4期746-750,共5页
The Chinese Journal of Process Engineering
基金
国家自然科学基金资助项目(编号:50276038)
上海市重点学科建设基金资助项目(编号:T0503)
关键词
天然气水合物
水滴
生长特性
喷雾
natural gas hydrate
water droplet
growth characteristics
water spray
