Performance of pumped thermal electricity storage system based on reverse/forward Brayton cycle

doi:10.19799/j.cnki.2095-4239.2021.0330

Abstract

Abstract:

Pumped thermal electricity storage (PTES) systems are a novel type of physical energy storage technology with low capital cost, high energy density, and no geographical restriction. In this study, the transient behavior of PTES systems based on the Brayton cycle was explored under cyclic stable state by coupling dynamics analysis method, transient heat transfer, and finite-time thermodynamics. The performance of the two concepts of PTES systems proposed by Isentropic Ltd. and Saipem S.A. company (hereafter, Is-PTES and Sa-PTES system, respectively) was analyzed and compared, and the influence of the working fluid, system maximum temperature, and volume of thermal energy storage reservoirs on the performance of the system are discussed. Under standard operating conditions, the round-trip efficiency of the Sa-PTES system is higher, whereas the Is-PTES system exhibits better output stability. The round-trip efficiency of the Is-PTES and Sa-PTES systems reaches 56.42% and 64.28%, respectively, and the performance of the PTES system using He is the best, followed by that of the system using air, and that of the system using Ar is the worst. Exergy analysis demonstrated that the compressors and expanders account for the highest proportion of exergy loss in the Is-PTES system, which was converted into heat exchangers and thermal energy storage reservoirs in the Sa-PTES system. When the allowable upper limit temperature of the PTES system is low, the performance of the Is-PTES system becomes better than that of the Sa-PTES system. For the Sa-PTES system, better performance can be obtained under high upper-temperature conditions, and it is affected more by the volume of packed beds.

Key words: Brayton cycle, pumped thermal electricity storage, energy storage, exergy analysis

CLC Number:

TK 02

Han ZHANG, Liang WANG, Xipeng LIN, Haisheng CHEN. Performance of pumped thermal electricity storage system based on reverse/forward Brayton cycle[J]. Energy Storage Science and Technology, 2021, 10(5): 1796-1805.

Figures/Tables 13

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参数	Is-PTES系统	Sa-PTES系统
最高温度/K	799.03	1268.15^[11]
最低温度/K	136.64	175.55
高温填充床初始温度/K	298.15^[17]	298.15^[11]
低温填充床初始温度/K	298.15^[17]	655.47
低温填充床压力/MPa	0.105^[17]	0.105^[11]
储电压比	10	4.6
释电压比	7.70	6.58
氦气流量/(kg·s^-1)	9.00	4.88
高温填充床体积/m³	503	202
低温填充床体积/m³	1006	342
压缩机/膨胀机等熵效率	0.9^[11]	0.9^[11]

参数	Is-PTES系统			Sa-PTES系统
参数	空气	氦气	氩气	空气	氦气	氩气
气体流量/(kg·s^-1)	42.14	9.00	89.36	21.01	4.88	48.60
储电压比	25.12	10^[17]	10	8.47	4.6^[11]	4.6
释电压比	17.41	7.70	7.70	13.98	6.58	6.58

最高温度/K	Is-PTES系统			Sa-PTES系统
最高温度/K	空气	氩气	氦气	空气	氩气	氦气
800	25.22	10.03	10.03	8.47	4.6	4.6
1000	53.56	17.17	17.17	8.47	4.6	4.6
1200	99.51	26.73	26.73	8.47	4.6	4.6

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