Compressed air, as the name implies, is air compressed by external forces. Air has compressibility, through the air compressor to do mechanical work to reduce its volume, the air pressure after the increase is called compressed air.

Compressed air is an important power source, compared with other energy, it is more clear and transparent, easy to transport, that is, there is no special harmful performance, there is no risk of fire, not afraid of overload, can work in many adverse environments. And the air is everywhere and inexhaustible.

Compressed air is the second largest power source after electric power. It is a process gas source with multiple USES. Its applications cover petroleum, chemical industry, metallurgy, electric power, machinery, light industry, textile, automobile manufacturing, electronics, food, medicine, biochemistry, national defense, scientific research and other industries.

Compressed air energy storage technology is widely used in the electric power industry. "Compressed air energy storage" is an electric energy storage system that can realize large capacity and long-term electric energy storage. It is an energy storage method that USES the off-peak, wind power, solar energy and other unstorable electric power to compress the air, seals the compressed high-pressure air in the gas storage facilities, and releases the compressed air to promote turbine power generation when needed. At present, underground gas storage stations adopt various modes, such as abandoned mines, gas storage tanks that settle on the seabed, caves, expired oil and gas Wells and newly built gas storage Wells, among which the most ideal is water sealed constant pressure gas storage station, which can maintain the output of constant pressure gas. The overground gas storage station adopts high pressure gas storage tank mode.

"Compressed air energy storage" is a kind of energy storage technology based on gas turbine. The technology has been very mature and can realize large-scale commercial application. "Compressed air energy storage" large capacity, long working hours, good economic performance, charge and discharge cycle. In China, there are many areas that do not have the natural conditions for the construction of pumped storage power stations, especially large wind farms and solar power farms far away from the consumption centers. It is urgent to research and develop another energy storage technology that can be used for a long time on a large scale. At this time, the advantage of "compressed air energy storage" is very obvious. It can make up for the inherent shortage of pumped energy storage, and will be an important choice to effectively solve the problem of large-scale energy storage in China.