Shenmu Ningtiaota Coal Mining Co., Ltd., Shaanxi Coal and Chemical Industry Group Co., Ltd.
College of Energy Science and Engineering, Xi’an University of Science and Technology

在“双碳”目标背景下,探索CO2高效地质封存和高能利用途径,是CO2减排研究的热点问题。基于CO2多相态变化特性以及能源利用方面表现出的安全环保及成本优势,提出一种新型碳封存超临界CO2螺旋管换热器,并建立了数值仿真模型,以5℃条件下CO2为对象,设计水作为载热流体的换热方案,研究了螺旋换热器在不同水温作用下对CO2的温度、压力及其热应力耦合变化规律。结果表明:随着水热流体温度的增加,CO2的升温速率与水温成正比,CO2输出温度与水热流体温度呈正相关变化;与CO2传热效率相比,受CO2相变吸热影响导致水热流体传热效率较慢,水热流体传热与温度变化成正比;初始水温升高,CO2相变速度明显增加,流量对CO2相变吸热影响较大,水热流体的体积流量与CO2温度变化呈负相关;受CO2升温吸热影响,水热流体的耗散温度与CO2吸热温度成正比;当管径和入口压力恒定情况下,100℃的水热流体与CO2进行换热可以较好地满足CO2相变吸热的要求。试验验证了水热流体螺旋管换热器的有效性和便捷性,研究为超临界CO2螺旋式换热器的设计提供了依据。

Under the background of the “ dual carbon” target, exploring the pathway of efficient geolog- ical storage and high energy utilization of CO2 is a hot issue in CO2 emission reduction research. Based on the multi-phase change characteristics of supercritical CO2 and the safety, environmental protection and cost advantages in energy utilization, a new supercritical CO2 spiral tube heat exchanger for deep earth storage is proposed, and a numerical simulation model is established. A heat transfer scheme with water as the heat-carrying fluid is designed for CO2 at 5 C. A study has been made of temperature, pres- sure, and thermal stress coupling changes of supercritical CO2 in a spiral heat exchanger under different water temperatures. The results show: As the temperature of the hydrothermal fluid increases, the heat- ing rate of supercritical CO2 is directly proportional to the water temperature, and the CO2 output tem- perature is positively correlated with the temperature of the hydrothermal fluid; compared with the heat transfer efficiency of CO2, the heat transfer efficiency of hydrothermal fluids is slower due to the influ- ence of CO2 phase change heat absorption, and the heat transfer of hydrothermal fluids is directly pro- portional to temperature changes; as the initial water temperature increases, the rate of CO2 phase change significantly increases, the flow rate has a significant impact on the heat absorption of CO2phase change, and the volumetric flow rate of the hydrothermal fluid is negatively correlated with the temperature change of CO2; the dissipation temperature of hydrothermal fluids is directly proportional to the CO2 endothermic temperature due to the influence of CO2 heating and heat absorption. When the pipe diameter and inlet pressure is constant, 100 ℃ hydrothermal fluid and supercritical CO2 heat transfer can achieve the CO2 phase change heat absorption requirements. The effectiveness and conven- ience of the spiral tube heat exchanger for hydrothermal fluids are verified through experiments, and the research provides a guideline for the design of supercritical CO2 spiral heat exchanger.

国家自然科学基金项目(51304119);陕西省自然科学基础研究计划项目(2019JLP09);新疆生产建设兵团重点领域科技攻关计划项目(2019AB001)第一作者:马亮,男,陕西绥德人,高级工程师,E-mail:1477534166@qq.com

马亮,邓广哲,王守印,等.碳封存超临界CO2螺旋管换热器传热规律[J].西安科技大学学报,2024,44(3):467-477.

MA Liang, DENG Guangzhe, WANG Shouyin, et al. Heat transfer law of carbon storage supercritical CO2 spiral tube heat exchanger[ J] . Journal of Xi’an University of Science and Technology, 2024, 44( 3) : 467-477.