An isothermal compression method for liquid medium heat storage and piston heat transfer

Abstract

The invention discloses an isothermal compression method of liquid medium heat storing and piston heat transferring. A piston, a solid heat exchange layer, a cylinder body, a pump and a radiator are involved, wherein gas and heat storage liquid are contained in the cylinder body, the piston is arranged in the cylinder body, one end of the solid heat exchange layer is connected with the piston, andthe other end of the solid heat exchange layer is in contact with the heat storage liquid; and the solid heat exchange layer moves up and down along with the piston, the cylinder body, and the pump and the radiator are connected in series to form a heat dissipation loop. According to the method, the solid heat exchange layer and a liquid heat storage layer with a large specific surface area are introduced on the basis of a traditional compressed air system to form a gas-solid-liquid coupled three-layer heat exchange structure, the solid heat exchange layer is used for increasing a heat exchange area of compressed air and the liquid heat storage layer, the rapid transfer of compression heat from the gas to the liquid heat storage layer is realized, the temperature of the cylinder body is stabilized by using the liquid heat storage layer with large heat capacity to absorb the compression heat, isothermal compression is realized, and the efficiency of the compressed air system and an energy storage system of the compressed air system is improved.

Description

Technical field: [0001] The invention belongs to the field of compressed air systems and compressed air energy storage, and in particular relates to an isothermal compression method for liquid medium heat storage and piston heat transfer. Background technique: [0002] At present, countries around the world are actively developing various new energy sources such as wind energy, solar energy, and biomass energy. In my country, the use of new energy accounts for only 7% of the total energy, and it is expected to reach 15% in 2020. [0003] As an important part of new energy, renewable energy is the most competitive form of new energy in terms of technology and cost, such as wind energy and solar energy. Currently renewable energy use accounts for only 1.5% of total energy and is expected to reach 6% by 2020. In 2011, the world's total installed capacity of wind power and photovoltaic power generation reached 238 million kilowatts and 69 million kilowatts, respectively. Howe...

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Problems solved by technology

Isothermal compression technology is proposed as a new generation of compressed air energy storage technology. Its purpose is to solve the problem of low efficiency of compressed air energy storage. Most compressed air energy storage systems in the prior art are based on adiabatic compression. Due to the short gas compression time , the heat of compression cannot be conducted to the environment in time, the temperature rises rapidly, the compression work increases, and about half of the electricity is converted into heat and lost

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