An analysis of the storage capacity of rock cavern repository for natural gas

doi:10.19799/j.cnki.2095-4239.2021.0138

Abstract

Abstract:

This study aimed to clarify the natural gas storage capacity and storage capacity availability of cavern repositories, assuming that the temperature of natural gas in each part of the gas storage was the same and that the rock mass around the gas storage was the same medium. Based on the principle of the conservation of energy and mass, and considering the real compressibility of natural gas, the temperature, and pressure change processes of compressed natural gas in constant-volume cavern gas storage were studied. Furthermore, the calculation method for the storage capacity and the gas storage capacity of a rock cavern for gas storage was proposed. The influence of cushion gas pressure on the gas storage capacity and storage capacity availability of cavern repositories were also analyzed. The results indicated that the cavern repositories' total gas storage capacity increased as the cushion gas pressure increased. Moreover, the injection-production ratio and the storage capacity availability exhibited a trend in which it initially increased before decreasing. When the cushion gas pressure was approximately 3.0 MPa, the storage capacity availability reached the maximum value. Once the gas production stage was completed, the pressure in natural gas stores gradually recovered. As the pressure of the cushion gas increased, less of the natural gas pressure would be recovered. The pressure recovery value of natural gas gradually stabilized once the cushion gas pressure was higher than 3.0 MPa. The study's conclusions provide good theoretical guidance for the feasibility of research and design approaches for various rock-cavern repositories for natural gas storage.

Key words: rock cavern for gas storage, compressed natural gas, thermodynamic process, gas storage capacity, storage capacity availability

CLC Number:

TE 85

Xinmin ZHANG, Zhongming JIANG, Liyuan LIU, Zhezhen XIAO. An analysis of the storage capacity of rock cavern repository for natural gas[J]. Energy Storage Science and Technology, 2021, 10(5): 1624-1630.

Figures/Tables 8

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计算参数		单位	参数值
洞室半径(r₀)		m	12.5
洞室长度(H)		m	2000
洞室表面积(A_c)		10⁴ m²	16
洞室体积(V)		10⁴ m³	100
密封层对流换热系数(h_c)		W/(m²·K)	50
洞室初始温度(T₀，T_rw)		℃	15
围岩密度(ρ)		kg/m³	2700
气体常数(R)		J/(kg·K)	518.3
空气等压比热(c_p)		J/(kg·K)	2215.24
空气等容比热(c_v)		J/(kg·K)	1697.5
热传导系数(λ)	围岩	W/(m·K)	3
	衬砌		1.74
	密封层		45

垫底气压力/MPa	注气速率/(kg·s^-1)	采气速率/(kg·s^-1)	垫底气质量/10³ kg	垫底气体积/10⁴ m³
0.1	11.3	3.2	669.6	100
1	14.75	17.0	6695.8	1000
2	15.25	36.0	13391.5	2000
3	15.15	47.0	20087.3	3000
4	14.8	46.0	26783.1	4000
5	14.32	42.5	33478.8	5000
6	13.76	39.07	40174.6	6000
7	13.14	35.5	46870.4	7000
8	12.5	32.5	53566.1	8000
9	11.83	28.9	60261.9	9000
10	11.15	25.48	66957.6	10000

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