Compressed air dual energy storage system without external heating source

Abstract

The invention discloses an air compression dual-energy-storage system without external heating sources. The system comprises a compressor set, an expansion machine set, a hydraulic turbine set, a pumping unit, water-air accommodating cabins, an air storage mine and a heat exchanger. During energy storage, valley electricity drives the compressor to compress air to a high-pressure state and conducts storage in the mine, and meanwhile a heat reclaiming device reclaims compression heat; during energy release, high-pressure air drives water in one water-air accommodating cabin into the hydraulic turbine to generate electricity, and after water drains away, the high-pressure air in the cabin enters into the expansion machine set after being preheated and works an electric generator to generate electricity; when air pressure in the cabin falls to barometric pressure, the pumping unit pours water into the cabin, meanwhile, the other water-air accommodating cabin begins to work, and operations are repeated in this way to release energy. The air compression dual-energy-storage system without external heating sources adopts dual water-air accommodating cabins to release electric energy, and saves cabin material and recycles water; during the circulation process, no external heating sources exist, fuel is saved, no harmful gas is exhausted, and environmental friendliness of the system is improved; by using the hydraulic turbine set in combination with the expansion machine set in generating electricity, energy utilization efficiency is high.

Description

technical field [0001] The invention relates to the technical field of electric energy physical storage, in particular to a compressed air double energy storage system without an external heating source. Background technique [0002] For a long time, my country's fossil fuel-based energy structure has caused many urgent problems such as environmental pollution and energy shortage. Therefore, it is imperative to develop renewable clean energy such as wind energy and solar energy. As of the end of 2015, my country has installed a total of 92,981 wind turbines, with a cumulative installed capacity of 145,362MW, a year-on-year increase of 26.8%, ranking first in the world. [1 , 2] . Renewable energy generation such as wind energy is also facing huge challenges while leading the energy transformation. Its volatility, intermittency and unpredictability all pose a threat to the safe and stable operation of the power grid, which has become a constraint for the renewable energy po...

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Problems solved by technology

Although the introduction of high-pressure gas storage tanks in the energy storage system solves the problem of variable working conditions in the PHCA system, when the energy storage scale is huge, the volumes of high-pressure gas storage containers and high-pressure water-gas co-containment cabins are also very large. The volume of the matching pool is also very large, so the amount of water used as the working medium for power generation cannot be underestimated, which will inevitably lead to a sharp increase in the cost of the energy storage system, a substantial increase in the cost of power generation, and even hinder the engineering application of this technology

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