Temperature and pressure effect on interfacial tensions of CO<sub>2</sub>-brine system

JI Jiayuan; ZHAO Lingling; LI Siyu

doi:10.11949/j.issn.0438-1157.20161837

您当前的位置：

首页 >

文章列表页 >

Temperature and pressure effect on interfacial tensions of CO₂-brine system

更新时间：2025-12-10

- Temperature and pressure effect on interfacial tensions of CO₂-brine system
- CIESC Journal Issue 7, Pages: 2880-2885(2017)
- 作者机构：
  
  东南大学能源热转换及其过程测控教育部重点实验室, 能源与环境学院,江苏,南京,210096
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20161837
  CLC： Q021.2
- Online First：05 July 2017，
  
  Published：05 July 2017
- 稿件说明：
移动端阅览
JI Jiayuan, ZHAO Lingling, LI Siyu. Temperature and pressure effect on interfacial tensions of CO₂-brine system[J]. CIESC Journal, 2017, (7): 2880-2885. DOI: 10.11949/j.issn.0438-1157.20161837.
DOI：

JI Jiayuan, ZHAO Lingling, LI Siyu. Temperature and pressure effect on interfacial tensions of CO₂-brine system[J]. CIESC Journal, 2017, (7): 2880-2885. DOI: 10.11949/j.issn.0438-1157.20161837. DOI：

摘要

在超临界态CO2封存于深部盐水层过程中，温度、压强等控制条件是影响封存效率和封存量的重要因素。应用分子动力学模拟的方法对343～373 K和6～35 MPa范围内的CO2-NaCl盐水系统进行了界面张力（IFT）及界面特性的研究，分析了IFT随温度及压强的变化关系，并观测到了压力平衡点pplateau；从分子尺度（物质密度、界面过余量、界面水合物密度）分析了IFT随压强、温度的变化，以及pplateau产生的原因。结果表明，pplateau前压强升高或温度降低将导致CO2密度升高，IFT下降，而pplateau后IFT趋于稳定且受温度影响较小；CO2的界面过余量及界面处水合物数量随压强及温度变化，与IFT的变化相反；高压下界面水合物密度的饱和现象可能是pplateau产生的重要原因。

Abstract

Temperature and pressure are important effect factors of the efficiency and quantity of CO2 storage in the deep saline aquifers. Molecular dynamics (MD) simulation is applied to investigate the CO2-NaCl systems in 343-373 K and 6-35 MPa

the interfacial tensions (IFT) which are obtained from the simulations are consistent with experimental results and the pressure balance point pplateau are observed as well in this paper. Meanwhile

the interfacial tension variations with the temperature and pressure are analyzed and the reasons of pplateau from the molecular viewpoint are explained. The results show that the pressure rise and temperature decline will increase CO2 density and decrease IFT before pplateau

but after pplateau the IFT will be stable and less affected by temperature. In addition

the changes of CO2 surface excess and the hydrate quantities with temperature and pressure showed the opposite trend compared with IFT variations

the saturation phenomena of hydrates at the interface under high pressure may be the fundamental reason of pplateau.

关键词

Keywords

references

Views

236

下载量

CSCD

Alert me when the article has been cited

提交

Tools

Publicity Resources

Ion effect on interfacial properties of CO2-brine system

Analysis on applicability of PEO/OTAC/NaSal mixture as the drag-reduction additives for firefighting system by mesoscopic molecular dynamics simulation

Volatilization of arsenic in coal during oxy-fuel combustion

Hydrolysis reaction mechanism of CNCl on the surface of composite metal CuCr2O4

Thermo-oxidative degradation characteristics of TPT backsheet from end-of-life photovoltaic modules

Related Author

JI Jiayuan

ZHAO Lingling

LI Siyu

Jinyuan ZHANG

Na XU

Wenyun HE

Yaodong LYU

Zilu LIU

Related Institution

Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy & Environment, Southeast University

College of Chemistry and Chemical Engineering, Taiyuan University of Technology

NaFine Chemical Industry Group Co., Ltd.

Department of Energy Power＆Mechanical Engineering, North China Electric Power University

College of Metallurgy and Energy, North China University of Science and Technology

⁰

Temperature and pressure effect on interfacial tensions of CO2-brine system

DOI：10.11949/j.issn.0438-1157.20161837

摘要

Abstract

关键词

Keywords

references

Temperature and pressure effect on interfacial tensions of CO₂-brine system