A multi-temperature zone heat storage power generation system and operation method

By combining a multi-temperature zone thermal energy storage power generation system with a heat pump cycle, the problem of limited load regulation range in the steam Rankine cycle is solved, enabling the power generation system to achieve rapid and deep regulation and flexible operation under extremely low load conditions, thus promoting the consumption of renewable energy.

CN117248979BActive Publication Date: 2026-07-21STATE GRID HUNAN ELECTRIC POWER COMPANY LIMITED +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
STATE GRID HUNAN ELECTRIC POWER COMPANY LIMITED
Filing Date
2023-09-28
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing steam Rankine cycle integrated thermal storage technology is limited by the minimum operating flow rate of the steam turbine when the load is reduced, which results in a limited range of system load regulation and cannot meet the actual needs of the power generation system.

Method used

A multi-temperature zone thermal energy storage power generation system is adopted. By setting multiple steam extraction ports and heat exchanger groups in the power generation system and combining them with valve group control, the coordinated operation of the power generation system and the thermal energy storage system is realized. This includes conventional power generation mode, thermal energy storage operation mode and heating operation mode. The system utilizes heat pump compressors and heat pump turbines for deep load reduction and achieves multi-stage load increase through regenerators and auxiliary heaters.

Benefits of technology

It enables rapid and deep regulation of the power generation system under extremely low load conditions, expands the load regulation range, and improves system flexibility and the ability to absorb renewable energy.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application discloses a multi-temperature-zone heat storage power generation system and an operation method thereof. The system comprises a power generation system and a heat storage system. The power generation system comprises a main heater, a high-pressure turbine generator, a low-pressure turbine generator, a cooler, a low-pressure regenerator, a booster pump and a high-pressure regenerator. The heat storage system comprises a first heat exchanger group, a second heat exchanger group, a heat pump compressor, a heat pump turbine, a heat storage tank group and a motor. The system can realize rapid and deep load reduction by the cooperation of two modes. The heat pump compressor and the heat pump turbine in the heat storage system are driven by the power of the power generation system when the load is reduced. The power is converted into heat by power consumption, the power output of the whole system is rapidly reduced, the system is not limited by the minimum operating flow of the turbine, the 0-load output of the whole unit can be realized, and the peak shaving depth is increased.
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