Tower solar thermal power plant utilizing supercritical water heat absorber and molten salt heat storage

Abstract

The invention provides a tower solar thermal power plant utilizing a supercritical water heat absorber and molten salt heat storage. The tower solar thermal power plant comprises a condensate pump, a deaerator, a water supply pump, the supercritical water heat absorber, a molten salt heat storage system, a steam turbine, a power generator and a condenser; the molten salt heat storage system comprises a water and molten salt heat exchanger, an expanding device, a cold salt tank, a hot salt tank, a cold salt pump, a hot salt pump and a molten salt and water heat exchanger; the condensate water is heated through the deaerator and input into the supercritical water heat absorber through the water supply pump, the solar radiation is absorbed, and the deaerated water is converted into the supercritical water to enter into the steam turbine to for work applying and power generation. The tower solar thermal power plant is combined with the work applying and power generation of the supercritical water and the molten salt heat storage and accordingly the tower solar thermal power plant can be suitable for various solar radiation conditions and the thermoelectric conversion efficiency is high; the work applying of the supercritical water is high in efficiency and free of phase change and accordingly the high thermoelectric efficiency can be guaranteed through a simple single-stage heat storage system; meanwhile the risk that the molten salt is solidified in the upper tower process is voided in comparison with a molten salt heat absorber.

Description

technical field [0001] The invention relates to the technical field of tower-type solar thermal power generation, in particular to a tower-type solar thermal power station using a supercritical water heat absorber and molten salt heat storage. [0002] Background technique [0003] Solar high-temperature thermal power generation technology is an important direction for large-scale utilization of solar energy, and it has far-reaching significance for human beings to solve problems such as fossil energy crisis and air pollution. There are many technical directions for solar high-temperature thermal power generation: according to different focusing methods, it can be divided into dish type, trough type, tower type, etc.; the working medium used includes water (water vapor), molten salt, air steam, heat transfer oil, liquid metal and other heat transfer media, etc. [0004] The tower-type focused solar thermal power generation system usually has a focusing factor of 500 to 100...

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Problems solved by technology

[0005] However, the freezing point of molten salt is very high. If it enters the heat absorber from the upper tower, it is very easy to solidify and block the pipe. The requirements for pipe preheating, equipment insulation, operation and maintenance are also stricter.

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