A water working medium cascade energy storage system for wide-range peak regulation of a thermoelectric unit

By introducing electric steam boilers and steam ejectors into thermal power units and combining them with water as the energy storage medium, a water-based cascade energy storage system was constructed. This solved the problem of insufficient peak-shaving flexibility of thermal power units, achieved efficient energy storage and grid dispatch, and improved the economy of thermal power plants and their ability to absorb new energy sources.

CN120608750BActive Publication Date: 2026-01-23HEHE DAZHI (BEIJING) TECH CO LTD
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Patent Information

Application Number
CN202510961261.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-07-13
Publication Date
2026-01-23
Estimated Expiration
2045-07-13

AI Technical Summary

Technical Problem

Traditional thermal power generating units lack flexibility in heating and peak power generation, leading to losses due to coal-fired power generation and difficulties in the absorption of new energy sources. Existing energy storage technologies suffer from problems such as system complexity, operational and maintenance difficulties, and low efficiency.

Method used

By introducing an electric steam boiler and steam ejector to decouple the boiler and turbine, and using water as the energy storage medium, a water-based cascade energy storage system for wide-range peak regulation of the thermal power unit is constructed. This system includes components such as a high-pressure energy storage heater, a low-pressure energy storage heater, a high-pressure water storage tank, and a low-pressure water storage tank, thereby achieving thermal-electric decoupling and smooth regulation.

Benefits of technology

It has improved the peak-shaving capacity and economy of thermal power units, reduced ineffective power generation, lowered operation and maintenance costs, realized large-capacity thermal storage and flexible grid dispatch, and adapted to the development needs of new energy.

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Abstract

A kind of water working medium cascade energy storage system of thermal power unit wide width peak regulation, comprising, thermal power main engine system, machine furnace decoupling system, water working medium heat storage system;Thermal power main engine system includes main steam pipeline, steam turbine high pressure cylinder, steam turbine middle pressure cylinder, boiler reheater;High pressure bypass is connected in main steam pipeline, and part of high temperature and high pressure main steam of main steam pipeline is connected into water working medium heat storage system after high pressure bypass;Middle pressure cylinder admission pipe is connected with middle pressure bypass, and part of heat re-vapor is connected into water working medium heat storage system after middle pressure bypass;Machine furnace decoupling system includes steam ejector, electric steam boiler, with the function of providing large-capacity heating / steam supply while deep regulating unit, the high pressure bypass and middle pressure bypass generated by decoupling can also be connected with large-capacity energy storage system, to provide low investment, high efficiency, large-capacity two-way peak regulation means for thermal power plant, better meet the coordination demand between new energy development and power grid stability faced by power grid.
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