Terrestrial heat-solar energy power generating system based on sCO2 brayton cycle

Abstract

The invention discloses a terrestrial heat-solar energy power generating system based on a sCO2 brayton cycle. The system comprises the SCO2 brayton cycle, a CO2 plume terrestrial heat system and a tower type solar energy system used as an auxiliary heat source. The sCO2 brayton cycle comprises a turbine, a high-temperature regenerator, a low-temperature regenerator, a cooler, a main compressor and a re-compressor. The CO2 plume terrestrial heat system comprises an injection well, a production well and a separator. The tower type solar energy system comprises a solar energy tower, a heliostatfield, an absorber, a high-temperature molten salt tank, a low-temperature molten salt tank, a heat exchanger, a molten salt pump and the like. According to the power generating system, through coupling of the sCO2 re-compression brayton cycle, the CO2 plume terrestrial heat system and the tower type solar energy system, a CO2 sealing system and a terrestrial heat exploitation system are combined,meanwhile, the utilization rate and the cycle heat efficiency of medium-low-temperature terrestrial heat resources are improved, and the cost of terrestrial heat exploitation is reduced.

Description

technical field [0001] The invention belongs to the technical field of new energy, and in particular relates to a geothermal-solar combined power generation system based on a supercritical carbon dioxide Brayton cycle. Background technique [0002] With global warming, for CO 2 The emission reduction and utilization are becoming more and more important. At present, research on carbon capture and storage technology (CCS) is constantly advancing, but this technology has problems such as high cost, high risk of leakage, and methods such as geological or marine storage that may have certain impacts on the environment. If it can be based on the storage technology, the captured CO 2 Utilization will have far-reaching significance for energy saving and emission reduction. [0003] The use of geothermal power generation, although it belongs to clean energy power generation, still has the defect of low efficiency. There are two main ways to improve the cycle efficiency of low-tem...

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Problems solved by technology

[0006] Purpose of the invention: the present invention provides a sCO-based 2 The geothermal-solar power generation system of the Brayton cycle, which solves the problem of low average heat absorption temperature and large loss of available energy in the prior art, and the large temperature difference between the cold and hot side fluids and irreversible heat transfer when the heat recovery process uses steam extraction for heat recovery The problem of large loss and low efficiency

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