Double-source heating fused salt energy storage system for thermal power plant

Abstract

The invention relates to a double-source heating fused salt energy storage system for a thermal power plant. The system comprises a thermal power generation system, a double-source heating fused saltsystem and a fused salt heat storage system which are sequentially connected to realize a heat exchange function between high-grade steam and electric power of the thermal power generation system andthe fused salt heat storage system. Full-load peak regulation of the thermal power plant can be achieved by heating fused salt through mixing of steam and electric power. The double-source heating fused salt energy storage system for the thermal power plant can also ensure that most of high-grade steam heat energy is stored, the steam turbine generator unit operates at a low load, electric power is generated to further heat fused salt for heat storage, and therefore the thermal power plant unit has the full-load deep peak regulation capacity and the capacity of rapidly increasing the load after peak regulation.

Description

technical field [0001] The invention relates to the technical field of energy storage, in particular to a thermal power plant dual-source heating molten salt energy storage system. Background technique [0002] Thermal power units have a high proportion of coal-fired heat and electricity, and the construction conditions for peak-shaving power sources are poor. During the heating period, thermal power units operate in the mode of "heat-based electricity", and the small output in winter is generally around 60%-70%. The problem of abandoning wind and light within the scope is serious, which is not conducive to my country's goal of adjusting the energy structure. [0003] Domestic scholars have proposed molten salt heat storage technology for thermal power plants for peak regulation of thermal power units. According to the public literature, the current main technical solutions include: extracting steam to heat molten salt for energy storage, extracting part of the high-temperat...

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Problems solved by technology

[0004] Although the current molten salt heat storage technology scheme can achieve the purpose of energy storage, it can only reduce part of the electric load of thermal power plants, and cannot achieve the purpose of deep peak regulation of units and zero power grid connection.

The heat storage capacity of some molten salt heat storage systems is also limited by the heating load, and some molten salt heat storage systems cannot store the heat of steam phase change, resulting in waste of heat

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