Underground rock cavity, underground rock cavity forming system and energy storage system based on underground rock cavity

Abstract

The invention discloses an underground rock cavity. According to the underground rock cavity, a carbonate rock stratum serves as a forming area, an acid solution is injected into the carbonate rock stratum, carbonate is dissolved through the acid solution to react to generate a salt solution and carbon dioxide, and after the salt solution and the carbon dioxide generated through the reaction are discharged, the underground rock cavity is formed in the position of the carbonate rock stratum. By means of the underground rock cavity, the limitation of the terrain to the arrangement of an energy storage system can be reduced, high energy density is achieved, and the economical efficiency of large-scale energy storage is improved. The invention further discloses an underground rock cavity forming system which is simple in structure and easy to implement. The invention further discloses a pumped storage system. The underground rock cavity is adopted to be used as a lower reservoir, the highest water level difference between an upper reservoir and the lower reservoir can reach 4000 m, and the unit energy density of the pumped storage system is improved. The invention further discloses a compressed air energy storage system which adopts the underground rock cavity as an air storage cavity and is stable in structure and good in safety.

Description

technical field [0001] The invention relates to the application of carbonate rock formations, in particular to an underground rock cavity, a formation system of the underground rock cavity and an energy storage system based on the underground rock cavity. Background technique [0002] At present, the energy storage system tries to use underground storage technology to store the energy medium. The energy medium is water or gas, and most of them use the existing abandoned mine as the underground storage chamber. On the one hand, the location of the abandoned mine is determined, which limits the energy storage system. On the other hand, the distance between the abandoned mine shaft and the ground is limited, which limits the unit energy density of gravity energy storage. [0003] Gravity energy storage technology is a method of energy storage using the potential energy of height difference. At present, pumped storage is the most widely used gravitational energy storage technol...

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Problems solved by technology

[0004] 1. Limited by the terrain, the height difference between the upper and lower reservoirs of pumped storage is usually only 100-550 meters, so its unit energy density is only 0.27Wh / L to 1.5Wh / L. In order to meet the regional daily peak-shaving needs, the upper , The volume of the lower reservoir is usually 5 million cubic meters to 7 million cubic meters, and the construction volume is huge

[0005] 2. Restricted by terrain conditions, many areas do not have the conditions to build pumped storage power stations

However, due to the location limitation of the abandoned mine itself, the maximum height difference between the high-level water storage area and the low-level water storage area can only reach 800m, and the energy density is limited.

In addition, the underground space of the abandoned mine is used as the underground water storage area, and the location of the pumped storage power station is limited by the location of the mine.

At the same time, the shape of the abandoned mine is affected by the mine itself, which is basically uncontrollable, and its stability and safety are doubtful.

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