发电技术 ›› 2026, Vol. 47 ›› Issue (2): 266-273.DOI: 10.12096/j.2096-4528.pgt.260204

• 发电及环境保护 • 上一篇    

超临界CO2再压缩循环吸热温差的热力学分析

甄箫斐1,2, 张沥1, 张永恒1   

  1. 1.兰州交通大学新能源与动力工程学院,甘肃省 兰州市 730070
    2.铁道车辆热工教育部重点实验室,甘肃省 兰州市 730070
  • 收稿日期:2025-03-06 修回日期:2025-05-25 出版日期:2026-04-30 发布日期:2026-04-21
  • 作者简介:甄箫斐(1987),男,博士,教授,研究方向为可再生能源,zxf283386515@163.com
    张沥(1998),男,硕士,主要研究方向为太阳能热利用技术;
    张永恒(1962),男,硕士,教授,从事能源与动力工程专业教学及相关科研工作。
  • 基金资助:
    国家自然科学基金(52206255)

Thermodynamic Analysis of Heat Absorption Temperature Difference of Supercritical CO2 Recompression Cycle

Xiaofei ZHEN1,2, Li ZHANG1, Yongheng ZHANG1   

  1. 1.School of New Energy and Power Engineering, Lanzhou Jiaotong University, Lanzhou 730070, Gansu Province, China
    2.Key Laboratory of Railway Vehicle Thermal Engineering of MOE, Lanzhou 730070, Gansu Province, China
  • Received:2025-03-06 Revised:2025-05-25 Published:2026-04-30 Online:2026-04-21
  • Supported by:
    National Natural Science Foundation of China(52206255)

摘要:

目的 为减少熔盐储能式塔式太阳能热发电系统的熔盐用量,需增大超临界CO2吸热温差,从而提高熔盐的吸、放热温差,因此针对超临界CO2吸热温差进行建模分析。 方法 通过在EBSILON中建立超临界CO2再压缩循环模型,并结合理论推导,分析主加热器吸热温差ΔT1和再热器吸热温差ΔT2。采用理论分析与仿真模拟相结合的方法,详细探讨了循环最高温度、循环最低温度、循环总压比、高压透平压比以及分流系数等参数对超临界CO2吸热温差的影响。 结果 提高循环最高温度,降低循环最低温度、循环总压比、高压透平压比以及分流系数可以增大主加热器吸热温差ΔT1;提高循环最高温度、循环总压比以及高压透平压比可增大再热器吸热温差ΔT2。当循环最高温度提高时,主加热器吸热温差ΔT1与再热器吸热温差ΔT2均提高,数据显示,当循环最高温度从400 ℃提高到700 ℃时,主加热器吸热温差从122.13 ℃提高到182.81 ℃,再热器吸热温差从54.47 ℃提高到67.23 ℃。 结论 通过调整循环参数,可以有效提高超临界CO2再压缩循环的吸热温差,从而优化系统性能。研究结果为进一步优化超临界CO2再压缩循环提供了理论依据。

关键词: 超临界CO2再压缩循环, 主加热器, 吸热温差, 再热器, 循环参数, 太阳能热发电, 熔盐

Abstract:

Objectives To reduce the amount of molten salt in molten salt thermal energy storage tower-type solar thermal power generation systems, it is necessary to increase the heat absorption temperature difference of supercritical CO2, thereby enhancing the heat absorption and release temperature difference of the molten salt, therefore, modeling and analysis are carried out for the endothermic temperature difference of supercritical CO2. Methods A supercritical CO2 recompression cycle model is established in EBSILON, and combined with theoretical derivation to analyze the heat absorption temperature difference of the main heater (ΔT1) and the reheater (ΔT2). A combination of theoretical analysis and simulation is employed to investigate in detail the effects of parameters such as the maximum cycle temperature, minimum cycle temperature, total cycle pressure ratio, high-pressure turbine pressure ratio, and shunt coefficient on the heat absorption temperature difference of supercritical CO2. Results Increasing the maximum cycle temperature, and decreasing the minimum cycle temperature, total cycle pressure ratio, high-pressure turbine pressure ratio, and shunt coefficient can increase the main heater heat absorption temperature difference ΔT1. Increasing the maximum cycle temperature, total cycle pressure ratio, and high-pressure turbine pressure ratio can increase the reheater heat absorption temperature difference ΔT2. When the maximum cycle temperature increases, both ΔT1 and ΔT2 increase. Data show that when the maximum cycle temperature rises from 400 ℃ to 700 ℃, ΔT1 increases from 122.13 ℃ to 182.81 ℃, and ΔT2 increases from 54.47 ℃ to 67.23 ℃. Conclusions By adjusting cycle parameters, the heat absorption temperature difference of the supercritical CO2 recompression cycle can be effectively improved, thereby optimizing system performance. The results provide a theoretical basis for further optimization of the supercritical CO2 recompression cycle.

Key words: supercritical CO2 recompression cycle, main heater, heat absorption temperature difference, reheater, cycle parameters, solar thermal power generation, molten salt

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