可靈活調節(jié)的壓縮二氧化碳儲能熱電聯(lián)供系統(tǒng)及其熱力學分析

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中圖分類號：TKO2文獻標志碼：ADOI：10.7652/xjtuxb202508008 文章編號：0253-987X（2025）08-0075-13

Flexible Compressed CO2 Energy Storage Combined Heat and Power System and Thermodynamic Analysis

XU Wenpan，ZHAO Pan，MA Ning，ZHOU Zhehao，LIU Aijie School of Energy and Power Engineering，Xi'an Jiaotong University，Xi’an 7loo49，China）

Abstract： To address the issues of low flexibility in existing compressed CO2 energy storage systems and significant throtling losses in gas storage devices，a ground-based constant-pressure CO2 storage device is proposed based on hydraulic principles. This device is coupled with a heat pump to construct a flexible compressed CO2 energy storage combined heat and power （CHP） system. By establishing thermodynamic models for key components and performance evaluation metrics for the system，the study investigates the impact of variations in key parameters under different operating modes on system performance. The results indicate that in the independent operating mode，the coefficient of performance of the heat pump subsystem initially increases and then decreases with rising ambient temperatures. The optimal inlet temperature for the turbine of the energy storage subsystem gradually increases with the compressor’s inlet temperature， especially accelerating in the near-critical region of CO2 . The charging and discharging efficiency of the energy storage subsystem shows a trend of first decreasing and then increasing，with the minimum efficiency occurring near the starting point of the near-critical region. Compared to existing compressed gas energy storage CHP systems， the proposed system improves the optimal charging and discharging efficiency by 9.35% ， and the coefficient of performance range is enhanced from 0.79-1.58 to 0.99-2.01 . This study demonstrates that the proposed compressed （20號 CO2 energy storage CHP system is characterized by efficient and flexible energy supply， providing a theoretical basis for the efficient utilization of renewable energy and promoting low-carbon transitions in rural areas.

Keywords： compressed CO2 energy storage; CO2 heat pump； thermodynamic performance; combined heat and power

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