Solar photo-thermal carbon dioxide Brayton cycle system of ORC intercooling compressor

Abstract

The invention provides a solar photo-thermal carbon dioxide Brayton cycle system of an ORC intercooling compressor. The solar photo-thermal carbon dioxide Brayton cycle system of the ORC intercoolingcompressor comprises a solar fused salt heat absorption system, a carbon dioxide transcritical Brayton cycle system with compressor intercooling, and an ORC cycle cooling system used for compressor intercooling and energy recovery. The front end of the carbon dioxide transcritical Brayton cycle system is connected with the solar fused salt heat absorption system; and the rear end of the carbon dioxide transcritical Brayton cycle system is connected with the ORC cycle cooling system. According to the solar photo-thermal carbon dioxide Brayton cycle system of the ORC intercooling compressor provided by the invention, on one hand, the enthalpy drop of a carbon dioxide turbine can be greatly increased so as to improve the molten salt utilization rate of a solar photo-thermal power generation system, and on the other hand, the pinch point heat exchange problem is avoided; and meanwhile, the system efficiency is higher than the efficiency of split-flow recompressor type supercritical carbondioxide circulation, and the structure is more compact.

Description

technical field [0001] The invention relates to the technical field of solar thermal power generation, in particular to a solar thermal carbon dioxide Brayton cycle system of an ORC intermediate cooling compressor. Background technique [0002] Supercritical carbon dioxide Brayton cycle power generation technology is generally considered to be a revolutionary and subversive international cutting-edge technology. Due to the high density of supercritical carbon dioxide and the simple cycle, the carbon dioxide turbine unit is light in weight, and the volume of its key impeller components can be reduced to steam 1%-5% of the gas turbine cycle system; the power density is the highest among all industrial power systems, only the turbine used in the space shuttle engine can match it, and the cycle efficiency is the highest when applied to heat sources above 500 °C , due to the improvement of efficiency, the cost of solar thermal power plants can be greatly reduced, and the reductio...

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Problems solved by technology

[0004] The enthalpy drop of the supercritical carbon dioxide Brayton cycle turbine is small, and the outlet temperature of the heat absorbing side of the regenerator is too high, which will seriously affect the heat absorption of the molten salt in the solar thermal power generation system by the carbon dioxide working medium, and reduce the utilization rate of the molten salt. And then affect the power generation of the solar thermal power station

[0005] The above two shortcomings limit the industrial application of supercritical carbon dioxide in solar thermal power plants

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