A novel transcritical CO2 energy storage system

被引：4

作者：

Wu Y. ^{[1
]}

Hu D. ^{[1
]}

Wang M. ^{[1
]}

Dai Y. ^{[1
]}

机构：

[1] Institute of Turbomachinery, Xi'an Jiaotong University, Xi'an

来源：

Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University | 2016年 / 50卷 / 03期

关键词：

Compressed air; Energy storage; Liquid CO[!sub]2[!/sub; Transcritical CO[!sub]2[!/sub; Wind power;

D O I：

10.7652/xjtuxb201603007

中图分类号：

学科分类号：

摘要：

To ensure grid frequency and power stability and realize bulk energy storage, a novel transcritical CO2 energy storage system was proposed in view of the defects in the existing compressed air energy storage systems. The concept is based on taking liquid CO2 as the storage media, thermal energy and cold energy as the main storage forms, so as to realize charging and discharging processes for wind power. Thermodynamic analysis and multi-objective optimization were performed and results showed that both round-trip efficiency and energy density increase firstly and then decline with the increase of discharging pressure at suitable charging pressure, which means that there exists an optimal discharging pressure. As charging pressure increases, round-trip efficiency declines while energy density increases. The key approach to improve the round-trip efficiency is to decrease the heat transfer temperature differences of cool storage unit, intercooler and reheater. The optimum round-trip efficiency and energy density are 50.4% and 21.7 kW·h/m3, respectively. The transcritical CO2 energy storage system has advantages such as high energy density, high-efficiency and environment friendly, no geographical restriction, showing a promising potential for storing wind power in large scale. © 2016, Xi'an Jiaotong University. All right reserved.

引用

页码：45 / 49and100

共 8 条

[1] Liu J., Xia H., Chen H., Et al., A novel energy storage technology based on liquid air and its application in wind power, Journal of Engineering Thermophysics, 31, 12, pp. 1993-1996, (2010)
[2] Mercangoz M., Hemrle J., Kaufmann L., Et al., Electrothermal energy storage with transcritical CO2 cycles, Energy, 45, 1, pp. 407-415, (2012)
[3] Wang H., Wang L., Wang X., Et al., A novel pumped hydro combined with compressed air energy storage system, Energies, 6, 3, pp. 1554-1567, (2013)
[4] Morgan R., Nelmes S., Gibson E., Et al., Liquid air energy storage: Analysis and first results from a pilot scale demonstration plant, Applied Energy, 137, pp. 845-853, (2015)
[5] Li S., Dai Y., Thermo-economic comparison of Kalina and CO2 transcritical power cycle for low temperature geothermal sources in China, Applied Thermal Engineering, 70, 1, pp. 139-152, (2014)
[6] Li M., Wang J., Li S., Et al., Thermo-economic analysis and comparison of a CO2 transcritical power cycle and an organic Rankine cycle, Geothermics, 50, pp. 101-111, (2014)
[7] Wang X., Wu Y., Wang J., Et al., Thermo-economic analysis of a recompression supercritical CO2 cycle combined with a transcritical CO2 cycle, ASME Turbo Expo 2015: Turbine Technical Conference and Exposition, (2015)
[8] Lemmon E.W., Huber M.L., Mclinden M.O., NIST reference fluid thermodynamic and transport properties: REFPROP, NIST standard reference database 23, (2010)

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