Normal-temperature liquid compressed carbon dioxide mixed working medium energy storage system and method

Abstract

According to the normal-temperature liquid-state compressed carbon dioxide mixed working medium energy storage system and method, one outlet of a compressor is sequentially connected with a hot side inlet of an energy storage heat exchanger, and the other outlet of the compressor is connected with a hot side inlet of a heat regenerator; a hot side outlet of the energy storage heat exchanger is sequentially connected with hot side inlets of the high-pressure storage tank, the energy release heat exchanger and the cooler; a cold side outlet of the heat regenerator is connected with an inlet of the compressor; an outlet of the regenerator is sequentially connected with inlets of the energy storage heat exchanger, the heat accumulator, the heat pump and the regenerator, and the heat pump is connected with the cooler and the energy release heat exchanger. According to the energy storage system, after the liquid low-pressure mixed working medium is throttled, depressurized, heated and gasified, the compressor is driven by surplus electric power to compress the gaseous working medium, the compression work of the unit working medium can be increased, the working medium flow is reduced, and therefore the storage amount of the working medium is reduced, the storage tank size is reduced, and the energy storage density is improved.

Description

technical field [0001] The invention belongs to the technical field of energy storage, and relates to a normal temperature liquid compressed carbon dioxide mixed working fluid energy storage system and method. Background technique [0002] In order to reduce pollutants and carbon dioxide emissions, my country's renewable energy has developed rapidly, and the installed capacity of new energy such as photovoltaic power generation and wind power has grown rapidly. However, new energy is greatly affected by the weather, and its output is intermittent and unstable. Internet access will affect the safe and stable operation of the power grid. To this end, it is necessary for new energy to cooperate with energy storage technology to solve the problem of large-scale renewable energy consumption by storing unstable and surplus renewable energy power and stably outputting power when needed. [0003] Carbon dioxide is non-toxic, non-polluting, stable in physical properties, abundant in...

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Problems solved by technology

[0004] In order to overcome the deficiencies of the above-mentioned prior art, the object of the present invention is to provide a system and method for energy storage of a normal temperature liquid compressed carbon dioxide mixed working medium. By mixing other substances in carbon dioxide, the critical temperature of the mixed working medium can be increased, so that the mixed working medium The mass is condensed by the cooling medium at room temperature and stored in a liquid state, which effectively solves the problem of low energy storage density

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