Liquefied gas energy storage system

Abstract

The invention discloses a liquefied gas energy storage system which comprises a liquefied gas storage tank, a turbo expander, a turbo expansion generator set, a heat exchange gasifier, a gas reliquefaction device, a heating heat exchanger, a water tank and a heat storage tank. The heat storage tank is connected with an electrode boiler through a pipeline; the turbo expander is connected with a fan through a pipeline, and the water tank is connected with a cold water pump through a pipeline. According to the invention, the problem of electricity abandonment in an off-peak electricity period and the problem of impact of unstable characteristics of wind power and photovoltaic power on a power grid are solved, various unstable waste heat, abandoned wind power, abandoned water, abandoned photovoltaic power and off-peak electricity can be fully utilized, through the electrode boiler, the heat loss is extremely small, the utilization rate is high, the adjustment range is large, and a turbine is utilized to generate electricity through expansion or apply work to gasified gas, so that the energy consumption is reduced. The cooling capacity generated by the Rankine cycle is low in energy consumption, high in conversion rate and good in economic benefit during reliquefaction.

Description

technical field [0001] The invention relates to the technical field of liquefied air energy storage, in particular to a liquefied gas energy storage system. Background technique [0002] Liquefied gas (air, CO2, N2 and other gases) energy storage technology has significant advantages such as low storage pressure, high energy storage density, and no terrain restrictions compared to other similar compressed air energy storage technologies. It can produce air or CO2, N2 and other gases into liquid storage by compressing and refrigerating the abandoned wind, light, water and low-valley electricity during the low electricity consumption period. During the peak electricity consumption period, the liquid gas is pressurized and vaporized. Sending electric energy that meets the power frequency requirements to the power grid can not only solve the problem of power abandonment during the low-valley period, but also solve the impact of the unstable characteristics of new energy (wind po...

AI Technical Summary

Problems solved by technology

[0003] Although liquefied gas energy storage technology has the above-mentioned advantages in eliminating peak-to-valley differences and solving new energy grid connection, the current traditional liquefied gas energy storage technology still has unstable new energy that is difficult to directly drive the compressor, and liquefaction of air will consume A large amount of energy, resulting in a somewhat reduced system efficiency

Currently, the efficiency of the Air Liquide energy storage system is only about 40%

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