Characteristics and optimization study of an adiabatic Ca-looping Carnot battery system based on pumped thermal electricity storage

doi:10.19799/j.cnki.2095-4239.2024.0918

Abstract

Abstract:

To tackle energy shortages and their uneven distribution, we propose a novel and advantageous coupled system that integrates Ca-looping thermochemical energy storage and pumped thermal electricity storage. In this system, charging is accomplished by using a heat pump to supply heat for the dehydration process, while discharging leverages the heat generated from hydration to produce electricity. This approach effectively eliminates thermal dissipation losses during storage, enabling long-term, large-scale energy storage. Our analysis highlights the impact of various operating parameters on cycle efficiency. Increasing the cycle pressure ratio during charging positively affects cycle efficiency but also increases a greater burden on the system, leading to diminishing marginal returns. The absorption temperature of the heat pump and dehydration temperature should be closely aligned to optimize performance. Minimizing the pinch temperature is crucial to enhance thermal energy utilization. During discharging, increasing the pressure ratio or aligning the intermediate pressure with the ideal value boosts the net power of the cycle, thereby enhancing cycle efficiency. Higher heat absorption temperatures of the generator and hydration temperatures, along with elevated storage temperatures of Ca(OH)₂, improve outcomes. However, the preheating temperatures of CaO and H₂O have a small impact. We employed the black-box concept, pinch analysis, and an improved genetic algorithm for optimization. This approach effectively controls exergy loss in the heat exchange network, achieving a maximum cycle efficiency of 65.96%. These results demonstrate the system competitiveness as a viable energy storage solution.

Key words: Ca-looping thermochemical energy storage, pumped thermal electricity storage, Carnot battery, parameter optimization, cycle efficiency

CLC Number:

TK 02

Yang DING, Hanwen WANG, Wenjie LU, Yuanjun LUO, Xiang LING. Characteristics and optimization study of an adiabatic Ca-looping Carnot battery system based on pumped thermal electricity storage[J]. Energy Storage Science and Technology, 2024, 13(12): 4247-4258.

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储能过程		释能过程
循环高压 1C	92 bar	循环高压 2C2	124 bar
循环低压 1E	7 bar	循环低压 2E2	9 bar
冷却温度 1TH	400 ℃	中间压缩压力 2C1	20 bar
加热温度 1TL	45 ℃	中间膨胀压力 2E2	27 bar
		加热温度 2TH1、2	600 ℃
		冷却温度 2TL1、2	-150 ℃

储能过程		释能过程
循环高压 1C	201 bar	循环高压 2C2	171 bar
循环低压 1E	15 bar	循环低压 2E2	55 bar
循环压比	13.40	循环压比	3.11
冷却温度 1TH	397 ℃	中间压缩压力 2C1	56 bar
加热温度 1TL	39 ℃	中间膨胀压力 2E2	108 bar
循环高温	635.63 ℃	加热温度 2TH1、2	595 ℃
		冷却温度 2TL1、2	-102 ℃
分解温度	415 ℃	水合温度	600 ℃
		CaO预热温度 2HX3	572 ℃
		H₂O预热温度 SuperH	459 ℃
CaO存储温度 1HX4	50 ℃	Ca(OH)₂存储温度 2HX2	50 ℃

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