Integrated carbon capture carbon dioxide double-Brayton-cycle power generation system

Abstract

The invention relates to an integrated carbon capture carbon dioxide double-Brayton-cycle power generation system. The integrated carbon capture carbon dioxide double-Brayton-cycle power generation system comprises a main cycle, a bottom cycle and a carbon capture system. The main cycle comprises a waste heat exchanger, a precooler, a main compressor, a recompressor, a low-temperature regenerator,a high-temperature regenerator, a high-pressure CO2 turbine, a low-pressure CO2 turbine, a main cycle power generator and a boiler which are connected through a main cycle working medium pipeline. The bottom cycle comprises a CO2 turbine, a second compressor, a second precooler, a first compressor, a bottom cycle power generator and a water-CO2 heat exchanger which are connected through a bottomcycle working medium pipeline. The carbon capture system comprises a reboiler, a storage tank, an overhead condenser, a compressor, a steam-water separator, a condenser, a regeneration tower, an absorption tower, a rich-lean liquor exchanger, a rich liquor pump and a lean liquor pump. Through the integration of the whole system, the waste heat utilization rate of a main cycle power generation system is increased, the source problem of a cycle working medium of a supercritical CO2 Brayton-cycle power generation system and the application problem of captured carbon dioxide are solved, and the CO2 emission reduction cost of power plants is lowered.

Description

technical field [0001] The invention belongs to the field of power generation, in particular to a carbon dioxide double Brayton cycle power generation system with integrated carbon capture. Background technique [0002] Due to the effect of the greenhouse effect, the living environment of human beings continues to deteriorate, and a large amount of CO 2 Emissions are the chief culprit of the greenhouse effect, and the huge amount of CO in thermal power plants 2 Emissions are an important source of carbon emissions and need to be cut urgently. Therefore, following desulfurization and denitrification, decarbonization of power plants is imperative [0003] supercritical carbon dioxide (SCO) 2 ) The Brayton cycle power generation system has the advantages of small footprint, high power generation efficiency, and good economy. Therefore, thermal power, nuclear power and other power generation systems try to use SCO 2 Brayton cycle as a new power cycle system. However, the cur...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a carbon dioxide double Brayton cycle power generation system with integrated carbon capture to solve the problem of supercritical carbon dioxide (SCO 2 ) is the carbon capture of the Brayton cycle power generation system with the circulating medium and the source of the circulating working fluid, to solve the source of heat required for the desorption and regeneration of the chemical absorbent during the carbon capture process and to regenerate CO 2 In order to improve the power generation efficiency and waste heat utilization efficiency of thermal power plants, how to combine the two to reduce the cost of carbon emissions and improve the comprehensive benefits of power plants

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