Compressed air energy storage system coupled and integrated with deep cooling air separation device

Abstract

The invention provides a compressed air energy storage system coupled and integrated with a deep cooling air separation device, and belongs to the technical field of energy storage and utilization. According to the compressed air energy storage system coupled and integrated with the deep cooling air separation device, starting from the peak valley electricity difference and time-of-use electricity price policies, deep cooling air separation and compressed air energy storage are coupled and integrated, and the operation cost is greatly reduced through electricity load peak load shifting; due to the fact that key equipment, operation maintenance, management modes and the like are highly similar, according to the compressed air energy storage system coupled and integrated with the deep cooling air separation device, air compressors of an energy storage device and the air separation device are integrally considered, and design allowance and equipment investment are reduced; waste heat generated by the air separation device is reasonably utilized, so that the power generation efficiency of the energy storage system is improved; in a high electricity price stage, the compressed air energy storage system directly provides air with pressure for the air separation device, so that consumption of high-cost electric energy is greatly reduced; and through coupling integration of the deep cooling air separation device and the compressed air energy storage system, the total operation cost of the peak electricity consumption stage and the valley electricity consumption stage can be saved by 45%, and the payback period of the compressed air energy storage device is about 5 years.

Description

technical field [0001] The invention relates to a compressed air energy storage system coupled and integrated with a cryogenic air separation unit, belonging to the technical field of energy storage and utilization. The system considers air separation and energy storage air compressors as a whole, reducing design margins and equipment investment; the stored high-pressure air expands to generate power when the electricity price is high, and realizes peak-shaving and valley-filling of electricity loads; at the same time, the use of air separation The waste heat of the device improves the power generation efficiency, provides compressed air to the cryogenic air separation unit, and reduces energy consumption at the stage of high electricity price. Background technique [0002] Large-scale air separation devices mainly adopt cryogenic rectification technology to separate air into oxygen, nitrogen and argon through air compression, expansion refrigeration, low-temperature rectifi...

AI Technical Summary

Problems solved by technology

[0004] Due to the diversity and uncertainty of power demand, the power supply capacity set by the power supply department according to the maximum demand is largely idled during low demand periods (especially in economically developed areas, where there are significant peaks and troughs in power load, in most cases Peak power consumption during the day and low power consumption at night), significantly increasing the cost of power generation and power supply

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