System and method for transcritical carbon dioxide power generation through utilization of gas-liquid separator and ejector

Abstract

The invention discloses a system and a method for transcritical carbon dioxide power generation through the utilization of a gas-liquid separator and an ejector. The system comprises the gas-liquid separator, a compression pump, a compressor, a regenerator, a heater, a turbine, the ejector, a cooler and the expansion machine, wherein the compression pump is used for pressurizing and outputting a liquid-phase working medium; the compressor is used for pressurizing and outputting a gas-phase working medium; the regenerator is used for back-heating the working medium pressurized and outputted by the compression pump by utilizing the heat of a working medium outputted by the turbine; the heater is used for heating the working medium outputted from a cold flow outlet of the regenerator to a preset temperature; the turbine is used for driving a power generator to generate electricity; the ejector is used for pressurizing the working medium outputted from a heat flow outlet of the regenerator by utilizing the working medium pressurized and outputted by the compressor; the cooler is used for cooling a fluid of the working medium pressurized and outputted by the ejector; and the expansion machine is used for doing work by utilizing the expansion of the working medium outputted from a heat flow outlet of the cooler. According to the system for transcritical carbon dioxide power generation, the condensation cost of the system can be reduced; and meanwhile, the circulation efficiency of the system can be improved.

Description

technical field [0001] The invention belongs to the technical field of thermal power generation, in particular to a transcritical carbon dioxide power generation system and method using a gas-liquid separator and an injector. Background technique [0002] With the continuous development of society, the human demand for energy is increasing, and the energy shortage problem has become a major issue worthy of attention; in this context, the super (trans) critical carbon dioxide cycle has the advantages of higher cycle efficiency and other advantages. It has received widespread attention and has gradually become a research hotspot all over the world. The cycle using super (trans) critical carbon dioxide as the working medium has simplified system, compact structure and high efficiency, and the super (trans) critical carbon dioxide cycle can be combined with various heat sources to form a power generation system. Power generation, waste heat power generation, geothermal power ge...

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Problems solved by technology

[0004] 1) If the back pressure of the turbine is too low, the working fluid will enter the two-phase region after releasing heat. Since the critical temperature of carbon dioxide is low, normal temperature water cannot be condensed, and a cold medium with a lower temperature must be used for condensation, which increases the system cost;

[0005] 2) If the back pressure of the turbine is too high and the working fluid does not enter the two-phase region after heat release, the system expansion is relatively low, and the cycle efficiency of the system is also low

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