Composite heat storage and extraction system and method suitable for peaking power generation

Abstract

The invention provides a composite heat storage and extraction system and method suitable for peaking power generation. The system comprises a heat source system, a sensible heat storage and extraction system, a latent heat storage and extraction system and a power generation system. The heat source system is used for heating supercooled water into superheated steam. The sensible heat storage andextraction system is connected with the heat source system and the latent heat storage and extraction system through a pipeline and used for carrying out heat energy storage and extraction through sensible heat when the temperature changes in the conversion process of the supercooled water and the superheated steam. The latent heat storage and extraction system is used for carrying out heat energystorage and extraction through latent heat when phase changes happen in the conversion process of the supercooled water and the superheated steam. The power generation system is used for converting heat energy into electric energy and is connected with the heat source system end to end to form a circulation pipeline. According to the composite heat storage and extraction system and method, the peaking capacity of the lower load depth of a power station boiler is achieved, meanwhile, the combustion stability and water circulation safety of the boiler during deep peaking are guaranteed, and theloss of the service life of the boiler under low loads is avoided; and the energy at the electricity trough period of a power plant can be converted to the electricity peak period, and operation economic performance of the power plant is improved.

Description

technical field [0001] The invention relates to thermal power generation technology systems, in particular to a composite heat storage and extraction system and method suitable for peak-shaving power generation. Background technique [0002] Usually, the demand load of each power plant in the power system is constantly changing. In order to maintain the balance of active power and keep the system frequency stable, the power generation department needs to change the power generation of the generator to adapt to the change of power load. It's called peak shaving and FM. Due to the limited load reduction capacity of power plant boilers, it can generally only be reduced to 30%-60% of the load. If the load continues to decrease, it will lead to problems such as unstable combustion, unsafe natural circulation, and accelerated aging of the boiler during low-load operation. When deep peak shaving is required, its load cannot be reduced to the required level. In order to solve this...

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Problems solved by technology

Due to the limited load reduction capacity of power plant boilers, generally it can only be reduced to 30% - 60% of the load. If the load continues to decrease, it will lead to problems such as unstable combustion, unsafe natural circulation, and accelerated boiler aging when operating at low load. When deep peak shaving is required, its load cannot be reduced to the required level

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