The influence of CAES reservoir design parameters on thermodynamic properties

doi:10.19799/j.cnki.2095-4239.2020.0256

Abstract

Abstract:

The thermodynamic properties of compressed air energy storage (CAES) have been reported in recent years, including the mean gas pressure and temperature in a gas reservoir and the influence on the security of the surrounding rock, but the temperature and pressure distribution in the cavity have not been reported. To study the thermodynamic properties of a CAES gas storage cavern, the effects of different shape parameters K (ratio of length and radius), and the inlet position on the internal thermodynamic properties of the cylindrical cavity, a non-isothermal conjugate heat transfer model was used to build a 3D model of a CAES gas storage cavern. The thermodynamic process of the charging stage was calculated under different values of K and with varied air inlet layouts. The results of the study indicated that: ① the temperature field in the CAES hole was heterogeneous, but the pressure field was uniformly distributed; ② a cylindrical cavity shape had a significant influence on the temperature field of the cavity, but little influence on the pressure distribution and exergy storage. In other words, the bigger the K value, the bigger the mean temperature and the maximum; ③ placing the air inlet in the center of the cavity significantly reduced the mean and maximum temperatures by 16 K and 159.61 K, respectively, but did not affect the exergy storage; ④ there was inhomogeneity in the temperature field of the CAES air storage cavern, where extremely high temperatures could form locally, which seriously threatens the safety of the lining and surrounding rock. The inhomogeneity of the temperature field can be improved by placing the air inlet in the center and designing reasonable shape parameters to avoid the thermal stress damage of surrounding rock caused by the temperature inhomogeneity.

Key words: compressed air energy storage, thermodynamic characteristics, gas storage caverns, design parameters, exergy storage

CLC Number:

TK 82

Fa WAN, Zhongming JIANG, Dong TANG. The influence of CAES reservoir design parameters on thermodynamic properties[J]. Energy Storage Science and Technology, 2021, 10(1): 370-378.

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参数	数值
储气室半径r/m	17.24
洞室体积V/m3	141000
洞室高度h/m	150
入气口半径r₁/m	0.265
围岩密度ρ/kg·m^-3	2100
围岩导热系数k /W·(m·K)^-1	4
围岩恒压比热容C_ps /J·(kg·K)^-1	840
对流传热系数h_w /W·(m²·K)^-1	30
气体常数R /J·(kg·K)^-1	287
气体恒压比热容C_p /J·(kg·K)^-1	1004
初始温度T₀/℃	40
初始压力p₀/MPa	5.9

工况	体型参数K	储气库半径R/m	储气库长度L/m	入气口位置
1	2.5	10	25	顶部
2	5	7.937	39.685	顶部
3	10	6.3	63	顶部
4	20	5	100	顶部
5	10	6.3	63	中部

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