深层CO2的材料行为和计算验证 碳酸盐储中的闭环地热系统
Xinghui Wu1,2, Peng Li2, Meifeng Cai2
1School of City and Architecture Engineering, Zaozhuang University, Zaozhuang 277160, China.
Materials (Basel, Switzerland)
|November 27, 2025
概括
闭环地热系统在深碳酸盐储中使用二氧化碳,提供卓越的热供应. 与二氧化碳的同轴设计显著提高了与水相比的热功率和长期稳定性.
科学领域:
- 地热能源工程 地热能源工程
- 储水库工程 储水库工程
- 碳酸盐水库的特性 碳酸盐水库的特性
背景情况:
- 闭环地热系统 (CLGS) 对于稳定的深层供热而无需地下水提取至关重要.
- 系统性能取决于井口,近井接口和形成合.
- 深层碳酸盐水库为地热能源带来了独特的挑战和机遇.
研究的目的:
- 开发和验证深碳酸盐储库中CLGS的热液压模型.
- 为了比较不同配置 (U管,同轴) 和工作流体 (CO2,水) 的性能.
- 优化CLGS的设计和操作,以提高热功率和长期稳定性.
主要方法:
- 开发了一个三域热液压框架,更新了CO2特性 (温度,压力).
- 在模型中明确考虑了井口形成的热阻.
- 在场约束下,将二氧化碳和水作为工作流体的U管和同轴几何相比较.
- 使用D22井的现场数据验证了模型,该井位于西冈新区.
主要成果:
- 使用二氧化碳的同轴配置实现了186.3千瓦的平均热功率,比水高44.9%.
- 二氧化碳系统显示,井口热量损失减少了3-5%.
- 出口温度预测与现场测量非常相匹配 (0.52%的差异).
- 长期模拟 (30年) 显示CO2的温度下降<8°C,表现优于水.
结论:
- 场校准模型对于准确的CLGS性能预测和参数可转移性至关重要.
- 使用CO2的单井同轴配置是深碳酸盐储库的最佳选择.
- 二氧化碳CLGS可以提高热量,确保长期供应稳定,支持工程部署.
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