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Abstract
The article presents the results of a numerical simulation of the deformation-stress state in the rock mass around a salt cavern which is a part of a CAES installation (Compressed Air Energy Storage). The model is based on the parameters of the Huntorf power plant installation. The influence of temperature and salt-creep speed on the stability of the storage cavern was determined on the basis of the three different stress criteria and the effort of the rock mass in three points of the cavern at different time intervals. The analysis includes two creep speeds, which represent two different types of salt. The solutions showed that the influence of temperature on the deformation-stress state around the CAES cavern is of importance when considering the stress state at a distance of less than 60 m from the cavern axis (at cavern diameter 30–35 m). With an increase in cavern diameter, it is possible that the impact range will be proportionately larger, but each case requires individual modeling that includes the shape of the cavern and the cavern working cycle.
Highlights
The stochastic process of the operation of power plants using renewable energy sources leads to the necessity to develop technologies that allow energy storage when there is no large demand for electricity
When analyzing the work of a salt cavern, it should be noted that it operates in a relatively small pressure range compared to natural gas storage caverns
Using the different models of creep law that are discussed in the literature, numerical calculations were performed of the deformation-stress state around a Compressed Air Energy Storage (CAES) salt cavern, and thermal influence was taken into account [5,6]
Summary
The stochastic process of the operation of power plants using renewable energy sources leads to the necessity to develop technologies that allow energy storage when there is no large demand for electricity. When analyzing the work of a salt cavern (the storage part of a CAES installation), it should be noted that it operates in a relatively small pressure range compared to natural gas storage caverns (in the Huntorf power plant, it is in the range 5–7 MPa). Using the different models of creep law that are discussed in the literature, numerical calculations were performed of the deformation-stress state around a CAES salt cavern, and thermal influence was taken into account [5,6]. The numerical creep law calculations in the model implemented Norton’s law; these were performed to verify the extent of the influence of temperature changes on the deformation-stress state around the storage cavern. The models begin to converge [8]
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