Constant-pressure energy storage system using carbon dioxide as working medium

Abstract

The invention relates to a constant-pressure energy storage system using carbon dioxide as working medium. The system still can provide a great deal of power under the condition of requiring no heat supplement by collecting and recycling heat generate by the carbon dioxide in the compressing process. Features such that the carbon dioxide dissolves with lubricating oil allow constant-pressure storage and constant-pressure release of liquid carbon dioxide and supercritical carbon dioxide. According to the feature that the carbon dioxide absorbs heat and releases heat during phase changing, a constant-temperature cold source is used to recycle and utilize part of the heat (cold), and thus, constant temperature of the constant-temperature cold source under the condition of no external heat (cold) supply and the demand of the carbon dioxide for heat (cold) during phase changing are guaranteed. Therefore, the system uses residual electricity or renewable energy sources as energy sources, produces no pollutant during running and is efficient, environment friendly and energy saving.

Description

technical field [0001] The invention relates to the technical field of energy storage, specifically, it is a new energy storage system that uses carbon dioxide as a working medium and surplus electric energy or renewable energy as an energy source, and can realize energy storage and energy release at constant pressure. Background technique [0002] Compressed air energy storage technology is an important energy storage technology. This technology uses air as the working medium, compresses and stores the air in the energy storage stage, uses fossil fuels to increase the air temperature in the energy release stage, and uses a turbo expander to generate power externally. Although this technology can achieve high energy conversion efficiency (40%-60%), the use of fossil fuels makes this technology have certain pollution problems. At the same time, with the depletion of fossil fuels, the compressed air energy storage technology The cost is gradually increasing, so the applicatio...

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Problems solved by technology

Although some scholars have proposed to use artificial storage containers to complete the storage of compressed air, the density of air after compression is still small (according to common air storage parameters, that is, the temperature is 300K, the pressure is 80atm, and the air density is about 100kg / m 3 ), so when the amount of stored air is large, the storage volume of the artificial storage container is still large

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