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太原理工大学重大突破!高温高压CO₂溶解度模型革新,深层含水层封存潜力评估更精准

  • 2026-03-19 20:48:39
太原理工大学重大突破!高温高压CO₂溶解度模型革新,深层含水层封存潜力评估更精准

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文献速览

关键词

二氧化碳;超临界;溶解度;状态方程;盐水含水层;碳封存;盐效应

地质封存是实现碳中和的关键技术,深层咸水含水层凭借巨大容量成为CO₂封存的核心载体,而溶解封存保障 CO₂长期稳定存储的核心机制。然而,深层咸水含水层普遍存在中高温(25-100℃)、高压(10-20MPa)环境CO₂在水中的溶解行为呈现显著非理想性,传统状态方程与亨利定律难以精准预测其溶解度,导致含水层封存潜力评估存在较大误差,制约了地质封存技术的规模化应用

研究出发点

现有技术存在三大核心痛点:一是传统热力学模型深层含水层温压条件下预测精度不足,无法捕捉CO₂溶解的复杂规律;二是缺乏针对 Na-Ca-Cl 型复合离子体系的盐效应量化分析,难以适配实际含水层卤水环境;三是实验测量方法存在气体脱附不完全高温汽液共蒸发等误差来源,难以获取精准的基础数据。为此,研究团队通过精准实验测量模型修正,建立适配高温高压环境的 CO₂溶解度预测体系,量化盐效应影响,为深层含水层封存潜力评估提供科学支撑

技术路线

采用 “实验数据获取 - 模型优化 - 盐效应分析 - 封存潜力评估” 的核心技术路线:以纯水与 Na-Ca-Cl 型卤水为研究对象,利用自主研发的高温高压反应装置精准称重系统,系统测量 25-100℃、10-20MPa 下 CO₂的摩尔体积与溶解度;基于实验数据修正PR 状态方程与亨利系数,提升热力学性质预测精度;通过改进Li-Mather方程,量化复合离子体系的盐效应影响;结合分子动力学模拟,阐明溶解机制;最终应用于鄂尔多斯盆地咸水含水层,完成封存潜力评估

研究内容

实验材料

核心原料:高纯度 CO₂(纯度≥99%);去离子水;模拟 Na-Ca-Cl 型卤水(含 Na⁺、Ca²⁺、Cl⁻,浓度匹配鄂尔多斯盆地含水层实际离子分布)

实验设备:自主研发高温高压 CO₂溶解测试系统(含 2435mL 反应釜,耐压 25MPa)、高精度电子秤(量程 5-75kg,精度 1g)、K 型耐高温高压腐蚀热电偶、压力传感器(量程 0-30MPa,精度 ±0.5% FS)

实验分组:设置3个压力梯度(10/15/20MPa)、7个温度梯度(25/37.5/50/62.5/75/87.5/100℃),分别测试纯 water 与模拟卤水体系中 CO₂的溶解特性

测试设置示意图

实验方法

基础数据测量:采用恒容法与称重法结合,先测定无水体时 CO₂的摩尔体积,再注入 2000mL 水 / 卤水,平衡后称重计算溶解度,每组实验重复 3 次验证可靠性

模型修正:通过 Levenberg-Marquardt 算法对实验数据进行非线性最小二乘拟合,优化 PR 状态方程与亨利系数参数

微观机制分析:借助分子动力学模拟,计算 CO₂形态转化的自由能垒,揭示盐效应与分子间相互作用机制

潜力评估:收集鄂尔多斯盆地含水层地质参数(温度、压力、孔隙度、有效厚度等),利用改进的 Li-Mather 方程计算封存容量

二氧化碳摩尔体积/密度与温度和压力之间的关系

二氧化碳密度的变化率

CO2 摩尔体积比较

PR-G 方程与 NIST 数据库之间的偏差分析

溶解度与温度的关系

溶解度与压力的关系

测试结果与其他文献发现的比较

基于修正 Li-Mather 模型(连续线)和 eCPA 模型(离散点)在不同压力和盐度条件下,CO2饱和 NaCl 溶液的密度变化与温度之间的关系

离子对 CO2 溶解度的影响

核心结论

1、明确溶解主导机制高温高压下 CO₂溶解温度、压力、分子间相互作用离子强度共同调控,特定区间的 “异常升高” 源于偶极诱导偶极作用增强与极性差异缩小,填补了传统热力学理论的认知空白;

2、建立高精度预测体系优化后的 PR-G 状态方程与修正亨利定律,实现 25-100℃、10-20MPa 区间 CO₂溶解度的精准预测,兼顾精度与计算效率,适配工程应用场景;

3、阐明盐效应规律高盐度环境离子强度主导 CO₂溶解度改进的 Li-Mather 方程可准确量化复合离子体系的影响,解决实际含水层卤水的预测难题

4、工程价值突出:模型成功应用于鄂尔多斯盆地,明确了深层咸水含水层的巨大封存潜力,为 CO₂地质封存项目的选址设计与优化提供了关键技术支撑

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  1. CONNECT:[ UseTime:0.001203s ] mysql:host=127.0.0.1;port=3306;dbname=h460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001458s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000701s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000681s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001469s ]
  6. SELECT * FROM `set` [ RunTime:0.000530s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001673s ]
  8. SELECT * FROM `article` WHERE `id` = 481707 LIMIT 1 [ RunTime:0.001278s ]
  9. UPDATE `article` SET `lasttime` = 1776639075 WHERE `id` = 481707 [ RunTime:0.069380s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.004618s ]
  11. SELECT * FROM `article` WHERE `id` < 481707 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001210s ]
  12. SELECT * FROM `article` WHERE `id` > 481707 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002145s ]
  13. SELECT * FROM `article` WHERE `id` < 481707 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002545s ]
  14. SELECT * FROM `article` WHERE `id` < 481707 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.006303s ]
  15. SELECT * FROM `article` WHERE `id` < 481707 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.017536s ]
0.277216s