多孔通道内CO2水合物生成特性实验研究
Experimental Study on the Formation Characteristics of CO2 Hydrate in Porous Media
李香璇 1崔卫 1马挺 1吕琳 2王秋旺1
作者信息
- 1. 西安交通大学能源与动力工程学院热流科学与工程系,西安 710049
- 2. 香港理工大学屋宇设备工程系,香港 999077
- 折叠
摘要
CO2水合物因在常低温条件下可以达到500 kJ/kg的高潜热值被认为是未来最具有前景的蓄冷材料之一,然而其生成的平衡压力较高,形成动力学缓慢且导热系数较低而限制了其应用.本文通过引入热力学促进剂四氢呋喃(THF)发现其对降低CO2水合物的生成压力有着显著作用,当THF质量分数为0.32时可以实现CO2水合物在环境温度为-3℃,压力0.6 MPa以下合成.通过将高导热支撑型多孔介质骨架与CO2水合物进行复合,研究发现,与无泡沫铜的情况相比,泡沫铜孔密度为20 PPI、50 PPI和90 PPI时的平均耗气量分别提升了 17.7％、28.7％和111.08％.提升泡沫铜孔密度一方面可以增加CO2水合物的生成量,提升材料蓄冷能力;另一方面会延长合成时间,增加蓄冷循环的准备时间,间接增大系统空间体积和重量.
Abstract
CO2 hydrate is considered as one of the most promising cold storage materials in the future due to its high latent heat value of 500 kJ/kg at constant low temperature.However,its high equilibrium pressure,slow formation kinetics and low thermal conductivity limit its application.In this paper,by introducing the thermodynamic accelerator tetrahydrofuran(THF),a significant effect on reducing the formation pressure of CO2 hydrate is found.When the mass fraction of THF is 0.32,the synthesis of CO2 hydrate can be achieved under temperature of-3℃ and pressure of 0.6 MPa.In addition,supporting porous media with high thermal conductivity is combined with CO2 hydrate,and results show that compared with the condition without copper foam,the average gas consumption at 20 PPI,50 PPI and 90 PPI increases by 17.7％,28.7％and 111.08％,respectively.On the one hand,increasing the pore density of copper foam can increase the production rate of CO2 hydrate and improve the normalized cold storage density of materials.On the other hand,the synthesis time can be prolonged,increasing the preparation time of the cold storage cycle,which will indirectly increase the space volume and weight of the cold storage system.
关键词
蓄冷/气体水合物/CO2水合物/多孔介质/实验研究Key words
cold storage/gas hydrate/CO2 hydrates/porous media/experimental research引用本文复制引用
基金项目
国家自然科学基金国际(地区)合作与交流项目(51861165105)
出版年
2024
NETL
NSTL
万方数据