Thermodynamic performance study of a pumped thermal energy storage system coupled with low-temperature waste heat recovery

doi:10.19799/j.cnki.2095-4239.2024.0780

Abstract

Abstract:

To effectively recover low-temperature waste heat resource in the steel industry, we have integrated the low-temperature sinter cooling flue gas waste heat as a heat source in a pumped thermal energy storage (PTES) system. We constructed thermodynamic calculation models for basic PTES (B-PTES) and regenerative PTES (R-PTES) systems. The R365mfc was selected as the cycle working medium of heat pump (HP), while the R1233zd(E), R245ca and R236ea were set as the working mediums for the organic Rankine cycle (ORC). Our study examined how the HP condensation and evaporation temperatures, as well as the ORC evaporation temperature, affect the thermodynamic performance of B-PTES and R-PTES systems under different ORC working medium conditions. The results show that reducing the HP condensation temperature and increasing the evaporation temperatures of HP and ORC can improve the heating coefficient (COP_new) and power efficiency (η_ptp) of the PTES system. However, higher HP condensation temperatures, lower HP evaporation temperatures, and lower ORC evaporation temperatures decrease the system's exergy efficiency (η_ex). For identical thermodynamic parameters, the R-PTES system consistently outperforms the B-PTES system in terms of COP_new, η_ptp, and η_ex. Evaluating the overall performance, the B-PTES system achieves optimal results with R1233zd(E) as the ORC medium, followed by R245ca and R236ea. Conversely, the R-PTES system performs best with R245ca, followed by R1233zd(E) and R236ea. Specifically, when using R245ca as the ORC working medium, increasing the HP condensation temperature by 2℃ results in an average η_ex decrease of 0.5% for B-PTES and 0.53% for R-PTES. Conversely, raising the HP evaporation temperature by 2℃ leads to an average η_ex increase of 0.2% for B-PTES and 0.21% for R-PTES. Furthermore, a 2℃ in ORC evaporation temperature results in an average η_ex improvement of 0.55% for B-PTES and 0.63% for R-PTES. Overall, for systems driven by low-temperature sinter flue gas waste heat, the R-PTES system is recommended, particularly using R245ca as the cycle working medium of the ORC system.

Key words: waste heat recovery, pumped thermal energy storage, organic Rankine cycle, regenerative structure, thermodynamic performance

CLC Number:

TK 115

Junsheng FENG, Yaru YAN, Lu WANG, Liang ZHAO, Hui DONG. Thermodynamic performance study of a pumped thermal energy storage system coupled with low-temperature waste heat recovery[J]. Energy Storage Science and Technology, 2024, 13(12): 4384-4395.

Figures/Tables 9

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有机工质	R365mfc	R1233zd(E)	R245ca	R236ea
工质类型	干	干	干	干
摩尔质量/(g/mol)	148.07	130.5	134.05	152.04
沸点/℃	40.15	18.3	25.13	6.19
临界温度/℃	186.85	166.5	174.42	139.29
临界压力/MPa	3.266	3.62	3.925	3.42
ODP	0	0	0	0
GWP	890	1	726	710

性能指标	文献[24]	模拟值	相对误差
COP_new	2.98	2.82	5.37%
η_ptp	22.7	23.8	4.85%
η_ex	18.1	19.27	6.46%

参数名称	数值	单位
热源进口温度	120	℃
热源流体质量流量	100	kg/s
储热器进口温度	135	℃
储热器出口温度	80	℃
HP蒸发器节点温差	10	℃
ORC冷凝器节点温差	5	℃
ORC冷凝温度	30	℃
ORC回热度	0.6	℃
压缩机等熵效率	85	%
膨胀机等熵效率	85	%
工质泵等熵效率	85	%
环境温度T₀	20	℃

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