近年来由于全球对化石燃料的严重依赖，大气中主要温室气体CO2 的质量分数不断增加，导致全球气温持续上升，所引发的温室效应受到了广泛关注。为了减少CO2向大气中排放，利用地下
盐水层将其长期隔离，被认为是有效的CO2 减排技术。地面800 米以下砂岩或灰岩构成的盐水层由于盐度较高不适合饮用，结合我国适合封存CO2 盐水层的地质条件，温度压力范围一般在
303.15~423.15K、10～20 Mpa之间，CO2处于超临界状态，为CO2封存提供了足够的空间。
In recent years the world is heavily dependent on fossil fuels, the mass fraction of CO2 in the atmosphere keep increasing and cause the global temperatures
continue to rise. The greenhouse effect has been widespread concerned. In order to reduce CO2 emissions to the atmosphere, sequestration CO2 into saline aquifers is
considered to an effective way to reduce CO2 emissions to the atmosphere. Underground 800m below the brine layer composed of sandstone or limestone, the water is not
suitable for drinking due to high salinity. The temperature and pressure is generally in the range 303.15 ~ 423.15K and 10 ~ 20 Mpa and CO2 is in a supercritical
state, which provides adequate space for CO2 storage.
可行的CCS系统示意图
Schematic diagram of possible CCS system
超临界CO2 盐水溶液的密度、溶解度等基础物性是CO2 地下储存研究的基础，而这方面的数据和模型国内外都比较缺乏且精度无法满足CO2埋存的需求。课题组以CO2 地下盐水层封存为背景
，开发基于磁悬浮天平的CO2 溶液基础物性测试技术，在实验室模拟地质封存条件303-423K、10-20MPa，对CO2 盐水溶液的密度、溶解度等基础物性进行精确的实验测量，获取系统的实验数
据，并进一步分析温度、压力、CO2 质量分数、盐离子种类和浓度等对CO2 盐水溶液基础物性的影响。在实验数据的基础上，研究CO2 盐水溶液中CO2、水、盐之间的相互作用，引入SAFT状态
方程建立地下盐水层CO2 溶液密度、溶解度的理论模型，为CO2 地质封存过程中流体的运动规律分析以及安全性评估提供支持，对CO2地质封存研究具有重要意义。
The properties of supercritical CO2 brine solution such as density and solubility are the basis of CO2 storage. Whereas the data and models are scare and lack of
accuracy so that they can not meet the demand for CO2 sequestration. This study aim to develop a CO2 solution basic physical property testing technology based on
Rubotherm magnetic suspension balance. In the laboratory simulating the CO2 geological storage conditions in the temperature and pressure range 303-423K ,10-20Mpa, the
density and solubility CO2 brine solution can be measured accurately to acquire systematic experimental data, and the impact of temperature, pressure, CO2
concentration, type and concentration of brine solution on the basis physical properties of CO2 solution will be further discussed. Based on the experimental data the
interaction between CO2, water and salt would be researched and SAFT equation of state will be introduced to establish a theoretical model for CO2 geological storage.
The study will provide technical supports to the law of fluid motion analysis and safety evaluation in CO2 geological storage.
研究领域
CO2资源化利用及地质封存技术研究
CO2溶液基础物性研究
Research field
CO2 utilization and geological storage technology
Basic physical property research of CO2 solution
实验装置示意图
Schematic Diagram of Experimental Device
磁悬浮天平
Magnetic Suspension Balance
悬浮部件
Suspension Components
实验系统由磁悬浮天平、气液注入系统、磁力循环泵及数据采集系统组成，测量范围：-20~150℃，UHV~20Mpa，测量精度达到0.01mg.实验系统不仅能进行CO2溶液密度测量试验，而且具备高
压可视窗，可以进行溶解度测量、气液扩散系数测量等功能
This apparatus contains MSB, gas and liquid injection system, magnetic circulation pump and data acquisition system. -20~150℃, UHV~20Mpa. The resolution reaches
0.01mg.This experimental system can not only for CO2 solution density measurement, but also can undertake solubility measurement and gas-liquid diffusion coefficient
measurement.
科研项目
973项目：注CO2提高原油采收率的多相多组分相态理论
863项目：CO2水溶液基础物性与微观运移测试技术
国家青年科学基金项目：地质封存条件下CO2-盐水体系的基础物性测试与研究
教育部新教师基金：超临界条件下CO2-H2O-NaCl体系基础物性建模研究
Research Project
973 program：Resource utilization and underground deposited of greenhouse gases enhancing oil recovery.
863 program：Capture and sequestration technology of CO2.
National Natural Science Foundation：Property research of CO2 - brine system under geologic sequestration
conditions.
The Research Fund for the Doctoral Program of Higher Education：Basic property test and modeling of supercritical CO2-H2O-
NaCl system
研究内容
Research
1.测量封存条件下CO2在盐水/油中的溶解度，建立溶解度模型
Measure the solubility of CO2 in brine/oil and establish the solubility model
2.测量封存条件下CO2溶液的密度，建立状态方程
Measure the densities of CO2 solutions under storage conditions and build the equations of state
3.模拟CO2在储层中的运移，为CO2的地质封存提供理论指导
Simulate the migration of CO2 in reservoir and provide theoretical guidance for CO2 geologic sequestration
天津地区实际地下盐水密度
Density of Tianjin Brine
CO2天津盐水溶液密度
Density of CO2 Tianjin Brine
CO2癸烷溶液随压力变化
CO2-decane density with pressure
CO2癸烷溶液随温度变化
CO2-decane density with temperature
