CO2 transcritical thermodynamic cycle electricity storage system and method

Abstract

The invention discloses a CO2 transcritical thermodynamic cycle electricity storage system, which comprises a heat pump circulation loop, a heat storage unit and a cold storage unit, wherein the heat storage unit and the cold storage unit are connected to the heat pump circulation loop, the heat pump circulation loop converts a working medium in the heat pump circulation loop into a high-temperature and high-pressure supercritical state and sends the working medium into the heat storage unit, the heat storage unit is internally provided with multiple sections of heat storage media, and a high-temperature and high-pressure supercritical working medium enters the heat storage unit and sequentially exchanges heat with each section of the heat storage media at an approximately constant temperature difference, so that heat energy is stored in the heat storage media. The invention further provides an electricity storage method of the CO2 transcritical thermodynamic cycle electricity storage system. In the heat exchange process of the high-temperature-end cycle working medium and the heat storage medium, good temperature matching in the heat exchange process of the high-temperature-end cycle working medium and the heat storage medium is achieved through the segmented heat exchange technology of mass flow adjustment and phase change heat storage medium conversion, and the heat exchange efficiency and the overall efficiency of the electricity storage system are improved.

Description

technical field [0001] The invention relates to the technical field of energy storage, in particular to a CO 2 Transcritical thermodynamic cycle power storage system and method. Background technique [0002] In the future, the proportion of renewable energy consumption in total energy consumption will increase rapidly, and power generation is the most important form of renewable energy utilization. The power supply structure will continue and accelerate the transformation from thermal power generation to renewable energy power generation, and the installed capacity of renewable energy will continue to increase. However, affected by sunshine, weather and climate, renewable energy such as wind energy, solar energy, and tidal energy have the characteristics of intermittent and fluctuating, and their direct power generation is unstable. Energy storage is an important technical solution to solve the mismatch between time and space in future energy. For power storage technology,...

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Problems solved by technology

[0005] The above-mentioned technical methods all belong to the field of thermoelectric energy storage technology, and there are still major deficiencies in improving the heat transfer temperature matching

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