Coal-electricity flexible peak shaving system and method coupled with solid-based composite phase energy storage

By coupling a solid-based composite phase energy storage device with a coal-fired power unit and using gravel as the heat storage medium, the high cost and safety risks of existing flexible peak-shaving systems for coal-fired power units are solved, achieving efficient heat storage and release, and supporting flexible peak-shaving of coal-fired power units and the consumption of renewable energy.

CN120970340APending Publication Date: 2025-11-18ZHEJIANG UNIV +1
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Patent Information

Application Number
CN202511169331.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-08-20
Publication Date
2025-11-18

AI Technical Summary

Technical Problem

Existing flexible peak-shaving systems for coal-fired power units, such as molten salt thermal storage systems, suffer from problems such as high initial investment, high operation and maintenance costs, significant safety risks, large energy losses, and uncertain economic benefits. Furthermore, traditional thermal storage technologies are inefficient.

Method used

A solid-based composite phase energy storage device is adopted, which couples an air electric heater and an air preheater with a coal-fired power unit. The sand and gravel in the serpentine pipe are used as the heat storage medium to achieve air heating and heat storage. Combined with reasonable valve management and fan configuration, heat storage and release are realized.

Benefits of technology

It reduces the cost of thermal storage media, improves system reliability and operational stability, supports flexible peak shaving of coal-fired power units, reduces carbon emissions, and realizes the large-scale consumption of renewable energy and coal substitution.

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Abstract

The invention relates to a coal power flexible peak shaving system and method coupled with solid-based composite phase energy storage, the system comprises an air electric heater, a solid-based composite phase energy storage device, a coal power unit and an air preheater, the air electric heater and the air preheater are respectively communicated with the coal power unit, the air electric heater is also communicated with the solid-based composite phase energy storage device, and the air preheater is communicated with the coal power unit. And the solid-based composite phase energy storage device is respectively communicated with the coal power unit and the air electric heater. By being coupled with the solid-based composite phase energy storage device, redundant or low-price electric power can be converted into heat energy to be stored in the solid-based composite phase energy storage device, the heat energy is released to a boiler combustion system when needed, renewable energy sources can be consumed, combustion efficiency can be improved, and flexible electric heat dispatching is achieved; the method can play a positive role in the aspects of enhancing the peak regulation capacity of the coal power unit, saving coal consumption, reducing carbon emission and the like; the method has technical demonstration capability and popularization potential, and is especially suitable for northwest regions with large-scale development of wind and light power generation in China.
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