CO<sub>2</sub>/H_2O复合工质冷凝传热传质特性数值模拟研究

刘优优; 杨竞择; 宋博文; 姚洪

doi:10.19666/j.rlfd.202506111

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CO₂/H_2O复合工质冷凝传热传质特性数值模拟研究

热能科学研究 | 更新时间：2026-06-12

- CO₂/H_2O复合工质冷凝传热传质特性数值模拟研究
- CO₂/H_2O复合工质冷凝传热传质特性数值模拟研究
- 热力发电 2026年55卷第4期页码：82-91
- 作者机构：
  
  1. 华中科技大学能源与动力工程学院
  2. 华中科技大学煤燃烧与低碳利用全国重点实验室
- 作者简介：
- 基金信息：
  
  国家重点研发计划项目（2023YFB4102503）~~
- DOI：10.19666/j.rlfd.202506111
  中图分类号： TM621;TK124
- 纸质出版：2026
- 稿件说明：
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[1]刘优优,杨竞择,宋博文,等.CO_2/H_2O复合工质冷凝传热传质特性数值模拟研究[J].热力发电,2026,55(04):82-91.
[1]刘优优,杨竞择,宋博文,等.CO_2/H_2O复合工质冷凝传热传质特性数值模拟研究[J].热力发电,2026,55(04):82-91. DOI： 10.19666/j.rlfd.202506111.

DOI：10.19666/j.rlfd.202506111.

摘要

【目的】构建清洁低碳的新型电力系统需开发高效灵活的火电技术。半闭式超临界二氧化碳(supercritical carbon dioxide

S-CO

)循环通过燃料与纯氧燃烧直接加热工质，实现高效发电与碳捕集协同。本文旨在探究半闭式S-CO

循环回热器中CO

/H_2O复合工质冷凝传热传质特性不明确的问题。【方法】构建了CO

/H_2O复合工质冷凝流动传热三维数值模型，系统研究质量流量(2×10

–4

～4×10

–4

kg/s)、热流密度(–9～–14 kW/m

)及入口水蒸气摩尔分数(3.3%～20.0%)对冷凝液膜分布、传热系数及传质速率的影响规律。【结果】结果表明，平均表面传热系数随质量流量增大而提升，但不同质量流量下，平均传热系数随热流密度增大的变化规律存在差异；轴向传质速率沿流动方向先增后减，低质量流量、大热流密度下冷凝水聚集于管底，高质量流量、小热流密度下呈环状分布；入口水蒸气摩尔分数从3.3%增至20.0%时，平均传热系数提升20.22%，传质速率峰值向入口移动。【结论】研究结果可为半闭式S-CO

循环回热器设计提供理论支撑，助力提升系统效率与碳捕集性能。

Abstract

[Objective

]

Building a clean and low-carbon new power system is a key vehicle for achieving the strategic goals of carbon peaking and carbon neutrality. Developing clean

low-carbon

high-efficient

and flexible new thermal power generation technologies has become a major strategic requirement for building a new energy system. The semi-closed supercritical carbon dioxide(S-CO

) Brayton cycle directly heats the composite working fluid through the combustion of the fuel and the pure oxygen. Not only can it enhance the power generation efficiency of the system

but it also enables carbon cap

ture at the same time. This study aims to investigate the unclear heat transfer and mass transfer characteristics of the CO

/H_2O composite working fluid during the cooling and condensation processes in the heat exchanger of the semi-closed S-CO

Brayton cycle. [Methods

]

A threedimensional numerical simulation model for the cooling

condensation and flow heat transfer of the CO

/H_2O composite working fluid was established. This study systematically investigated the influence pattern of the mass flow rate(2×10

–4

～4×10

–4

kg/s)

the heat flux(–9～–14 kW/m

)

and the mole fraction of the inlet water vapor(3.3%～20.0%) on the distribution of the liquid film of the condensate

the surface heat transfer coefficient

and the mass transfer rate. [Results

]

The results indicate firstly that the average surface heat transfer coefficient increases with increasing mass flow rate. However

at different mass flow rates

the variation pattern of the average surface heat transfer coefficient differs as the heat flux increases. Moreover

the axial mass transfer rate exhibits a trend of increasing first and then decreasing along the flow direction of the composite working fluid. Furthermore

under low mass flow rate and high heat flux conditions

the condensate accumulates at the bottom of the circular pipe

while under high mass flow rate and low heat flux conditions

the condensate forms a ring-shaped distribution along the inner wall surface of the circular pipe. Additionally

when the mole fraction of the inlet water vapor increases from 3.3% to 20%

the average surface heat transfer coefficient increases by 20.22%. Besides

the peak value of the mass transfer rate shifts toward the inlet direction. [Conclusion

]

The results can provide theoretical support for the design of the heat exchangers in the semi-closed S-CO

Brayton cycle

and then contribute to improving the efficiency of the system and the performance of the carbon capture.

关键词

Keywords

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CO2/H_2O复合工质冷凝传热传质特性数值模拟研究

DOI：10.19666/j.rlfd.202506111

摘要

Abstract

关键词

Keywords

references

CO₂/H_2O复合工质冷凝传热传质特性数值模拟研究

CO₂/H_2O复合工质冷凝传热传质特性数值模拟研究