Stability Analysis Of The Underground Gas Storage In Salt Rock In The Process Of Compressed Air Energy Storage

Nowdays,the problem of the unbalance of electrical load is increasingly prominent.The demand is greatly different in season, enen in day and night.Therefore, people pay more attention to the electrical energy storage and the rational utilization . Compressed air energy storage, efficient ,energy saving and environmental protecting, is a technology for electrical energy storage in a large-scale in the world.Salt rocks with very low permeability and good creep behavior can ensure the tightness of the storage in salt rock formation. It can adapt well to the variation of the pressure of the storage because of its steady mechanical behavior. In addition, its solubility in water makes the excavation of storage cavern in deep salt rock formation easy and economic. So, salt rock is a well-known ideal medium for compressed air energy storage. Taking the first underground salt rock gas storage in our country (Jiangsu Jintan gas storage) as an example, the dissertation gives the effecting factor of the stability of the gas storage in salt rock stratum. The main research works of this dissertation are as follows:1. The research of the system of compressed air energy storage in salt rock Firstly,expounding the basic principles of the system of compressed air energy storage. Next,by the studying of the effective volume of the cavern, air compression factor and the minimum volume of the cavern, the minimum capacity of the cavern in salt rock required for compressed air energy storage is obtained.2. The research of mechanical characteristics of salt rock Firstly,the strength behavior of the salt rocks is researched by a series of tests including uniaxial and triaxial compression test and direct shearing test of the salt rock samples. Next,the creep deformation properties are analyzed by the uniaxial and triaxial compression creep tests of the salt rock samples. The steady creep strain law is studied and the creep parameters are obtained from these test results.3. Firstly,The main contents of the stability evaluation of the air storage cavern is studied.the evaluating criteria of stability of the air storage cavern is pre-set. Secondly, the effecting factor of the stability of the air storage in salt rock stratumis studied by numerical simulations.mainly including the running inner pressure, the height radius ratios, the depth and the velocity of the air injection and discharge4. The stability of the underground energy storage in Jintan Salt Mine in Jiangsu province is demonstrated in detail. The stability of the energy storages after excavation is steady and the long-term volume losses are satisfactory by the results of numerical simulations. in different inner pressures...