Multi-grade heat pump type double-pot salt melting and energy storage power generation system

Abstract

The invention provides a multi-grade heat pump type double-pot salt melting and energy storage power generation system. The multi-grade heat pump type double-pot salt melting and energy storage powergeneration system comprises: a high-temperature salt melting pot, a low-temperature salt melting pot, a high-temperature antifreeze fluid pot, a low-temperature antifreeze fluid pot, a compressor, a first heat pump, a low-temperature salt melting pump, a high-temperature salt melting pump, a turbine, a second heat pump, a high-temperature antifreeze fluid pump, a low-temperature antifreeze fluid pump, a first heat exchanger, a second heat exchanger and a power generator; and electric energy and heat energy can be transformed into each other through selectively opening one or more of the high-temperature salt melting pot, the low-temperature salt melting pot, the high-temperature antifreeze fluid pot, the low-temperature antifreeze fluid pot, the compressor, the first heat pump, the low-temperature salt melting pump, the high-temperature salt melting pump, the turbine, the second heat pump, the high-temperature antifreeze fluid pump, the low-temperature antifreeze fluid pump, the firstheat exchanger, the second heat exchanger and the power generator. The multi-grade heat pump type double-pot salt melting and energy storage power generation system provided by the invention can realize stable output of renewable energy source power including wind power or photovoltaic power generation and the like, has the effect of balancing power supply and demand and can realize large-scale energy storage and realize the advantages of energy storage and peak regulation; and the problem of the energy storage of renewable energy sources is solved.

Description

technical field [0001] The invention relates to the technical field of energy storage, in particular to a multi-stage heat pump double-tank molten salt energy storage power generation system. Background technique [0002] The molten salt heat storage technology is to heat the molten salt through electric energy, solar energy and other energy sources in the heat storage stage, and store the heat in the high-temperature molten salt. In the heat supply stage, heat is released through high-temperature molten salt, and high-temperature molten salt releases heat to heat users through heat exchange. The heat released is in the form of supplying steam, driving steam turbines to generate electricity through supplying steam, and supplying heat, etc., which can be applied to light Energy storage systems such as heat storage in thermal power plants, peak shaving in thermal power plants, power consumption of renewable energy such as abandoned wind and light, and utilization of low-peak e...

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Problems solved by technology

[0004] However, the above technical solutions have the following defects: the cycle mode of energy storage (electricity storage) through the normal temperature working medium is: compression-heat release (through the second heat storage body)-expansion work-heating-heat absorption (through the first heat storage body); the cycle mode of power supply is: compression - heat absorption (through the second heat storage body) - expansion work - heat release (through the first heat storage body) - heating

In the energy storage circulation mode, if a single-tank energy storage is used, the heat and cooling capacity cannot be fully stored; if a double-tank energy storage is used, the heat and cooling capacity can be fully stored; in the power supply cycle mode, in order to maintain the high-temperature heat source The temperature difference between the second heat storage body and the first heat storage body as a low-temperature heat source and the energy conversion efficiency need to increase the temperature of the second heat storage body, then the system compression ratio will increase, and the temperature at the high temperature end of the system will also increase, increasing the resistance of the system Demand for high-temperature materials; the system is an open cycle, which is not applicable when the circulating working medium is helium, argon and other gases

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