High-temperature and high-pressure steam heating fused salt energy storage system of thermal power plant

Abstract

The invention relates to a high-temperature and high-pressure steam heating fused salt energy storage system of a thermal power plant. The energy storage system comprises a conventional thermal powergeneration system, a steam heating fused salt system and a fused salt heat storage system. The conventional thermal power generation system is a reheating steam unit; the steam heating fused salt system consists of five heat exchangers, and is connected with the thermal power generation system and the fused salt heat storage system to achieve a heat exchange function of high-temperature and high-pressure steam of the thermal power generation system and the fused salt heat storage system. Through the high-temperature and high-pressure steam heating fused salt energy storage system, high-grade steam of the thermal power generation system is stored, and steam in an inlet of a steam turbine can be bypassed away, so that the total thermoelectric decoupling is realized, the flexible operation and the deep peak pitching of the thermal power generation system are facilitated, and meanwhile, the operation safety of a boiler and a turbine generator set is guaranteed.

Description

Technical field [0001] The invention relates to the technical field of energy storage, in particular to a thermal power plant high temperature and high pressure steam heating molten salt energy storage system. Background technique [0002] In order to implement the concept of green development, China's energy structure has been rapidly transitioning to new energy in recent years. The rapid increase in the proportion of new energy sources such as wind and solar energy has greatly increased the number of times that thermal power units have participated in peak shaving and their quality requirements. On the other hand, due to economic development, the peak-to-valley difference in power consumption is increasing. In northern China, cogeneration units are often used to ensure heating in winter. The peak-to-valley difference in power consumption and the heat and power contradiction during the heating season have sharply deteriorated. As thermal power units are still China's most basic ...

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Problems solved by technology

(The high-pressure main steam is greatly decompressed, resulting in energy loss; high-temperature steam cannot be used for phase change heating, and most of the heat energy is wasted for heating or condensation)

[0004] The current molten salt heat storage systems are highly coupled with the thermal power system of thermal power generation, and the heat storage capacity is small. It is impossible to realize the independent energy storage of molten salt when the turbine is shut down. The heat storage capacity of some molten salt heat storage systems is limited by the heat supply capacity. , some molten salt heat storage systems cannot store steam phase change heat, resulting in waste of heat

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