Power generation system for performing energy gradient utilization on geothermal energy and solar energy

Abstract

Disclosed is a power generation system for performing gradient utilization on geothermal energy and solar energy. The system comprises 5 loops of a geothermal water loop, a solar energy heat collection working medium loop, a heat storage medium loop, a water / steam loop and a cooling water loop. The geothermal energy is used for heating working media of water of a steam turbine to a saturation condition, and the solar energy is used for heating the water to a superheat state and reheating exhaust of a high-pressure cylinder of the steam turbine, accordingly, the gradient utilization of the geothermal energy and the solar energy is achieved, and the thermal efficiency of the power generation system can be improved greatly; simultaneously, sealed operation of geothermal water is achieved, and environment pollution cannot be caused; and the geothermal water loop keeps positive-pressure operation, problems of scaling, corrosion and the like of equipment are solved, and the operation cost is reduced. Besides, an energy storage system is utilized, so that the storage and the release of the solar energy are achieved, and efficient operation of the power generation system without sunlight is guaranteed.

Description

technical field [0001] The invention relates to the field of power generation, in particular to a power generation system for cascade utilization of geothermal and solar energy. Background technique [0002] Geothermal resources are spread all over the world. At present, the utilization of geothermal energy is mainly limited to steam fields and hot water fields, which are collectively referred to as geothermal fields. Geothermal heat below 90°C can be used for heating, medical treatment and production process heating. Water vapor or hot water above 90°C can be used for power generation. For high-temperature steam fields above 160°C, the steam produced can be directly introduced into steam turbines for power generation. For hot water fields with lower temperatures, hot water needs to be expanded to evaporate hot water into steam for further generation. Introduction of steam turbines to generate electricity. Geothermal power plants have neither fuel transportation equipment ...

AI Technical Summary

Problems solved by technology

The disadvantage of this system is that the geothermal water cannot be heated to a superheated state, otherwise it will cause serious fouling of equipment and pipelines; the quality of the heated geothermal water is still relatively low, and the low boiling point liquid can only be reheated through a heat exchanger Working fluid of steam turbine

Therefore, the thermal efficiency of the whole system is relatively low

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