Solar power generation method and system with CO2 as working medium

Abstract

The invention relates to a solar power generation method and system with CO2 as a working medium. The method comprises the steps that the CO2 is used as the working medium, a tower type solar absorber is used as a heating source, and the CO2 absorbs solar heat in the tower type solar absorber and heats up to a super-critical state; the super-critical CO2 enters a super-critical CO2 turbine serving as an energy conversion device to do work by expansion and becomes CO2 waste steam after electric energy outputting; the CO2 waste steam discharges heat through lower-pressure-side channels of a plurality of regenerators sequentially and absorbs heat through high-pressure-side channels; the branch flow of the CO2 waste steam entering a gas cooler and a plurality of compressors is adjusted through a plurality of valves; by the adoption of gas extraction compressing method, the CO2 compressed through the compressors enters the regenerators corresponding to the compressors, so that CO2 fluids at different pressures in the high-pressure-side channels and the low-pressure-side channels in all the regenerators have similar heat capacities; the CO2 completing circulation returns to the tower type solar absorber and enters next circulation.

Description

technical field [0001] The present invention relates to a solar power generation method and a power generation system, in particular to a 2 A solar power generation method and power generation system using a working medium. Background technique [0002] As a renewable energy technology, solar power generation technology has received more and more attention and research from all over the world. At present, the solar thermal power generation system using water as the working medium has an absolute advantage in the field of medium and low temperature solar thermal power generation, and the technology itself and equipment development are relatively mature. In recent years, new technical solutions are developing towards higher heat absorption temperature and cycle efficiency as well as lower cost. However, in the high-temperature solar thermal power generation system using water as the working medium, the expansion of water is relatively large, requiring multi-stage expansion, ...

AI Technical Summary

Problems solved by technology

CO with a temperature lower than 250°C and a pressure lower than 15MPa 2 When passing through the turbine, due to the low expansion ratio, the temperature drop is less, that is, CO 2 Most of the heat absorbed by the solar collector is transferred to the environmental medium, and only a small part is converted into success, so the thermal efficiency of the system is not high, generally less than 20%.

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