Trans-critical carbon dioxide power generation system and method driven by solar energy and geothermal energy

Abstract

The invention discloses a trans-critical carbon dioxide power generation system and method driven by solar energy and geothermal energy. The trans-critical carbon dioxide power generation system driven by solar energy and geothermal energy comprises a solar sub system, a geothermal energy sub system and a trans-critical carbon dioxide circulating sub system, wherein the solar sub system is in coupling connection to the trans-critical carbon dioxide circulating sub system through a solar heater; the solar sub system is in coupling connection to the geothermal energy sub system; the geothermal energy sub system is in coupling connection to the trans-critical carbon dioxide circulating sub system through a geothermal energy heater and a low-temperature reheater / heater; a first control valve group is connected on the solar heater; a second control valve group is connected on a heat exchanger; and a third control valve group is mounted between the geothermal energy heater and the heat exchanger to switch a power generation mode. The trans-critical carbon dioxide power generation system can make up defects of solar energy and geothermal energy, and improves operation efficiency.

Description

technical field [0001] The invention relates to a hybrid power generation system based on transcritical carbon dioxide, in particular to a transcritical carbon dioxide power generation system driven by combined solar and geothermal energy; in addition, it also relates to a transcritical carbon dioxide power generation method driven by combined solar and geothermal energy. Background technique [0002] At present, due to the great demand for energy due to the continuous development of human civilization, a large amount of fossil energy has been developed and used all the time, resulting in the emergence of problems such as harsh environment and energy crisis, thus making the research on clean and renewable green new energy a Energy strategies of countries around the world. Solar energy and geothermal energy, as members of the new energy family, each have some defects caused by the characteristics of the resource itself, which makes the development and utilization of the two h...

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Problems solved by technology

The system efficiency of the organic Rankine cycle is higher than that of the steam Rankine cycle, and the components are simpler. The system equipment can realize standard modular production, but there are certain pollution risks in the organic working medium, and there is a phase transition in the endothermic process, which is prone to pinch points. The problem (the pinch point problem refers to: in the heat exchanger, due to the large difference in the heat capacity flow rate of the fluid on the cold and hot sides, the temperature change trend is different, so that the minimum temperature difference point of the heat exchanger appears inside the heat exchanger instead of ends, deteriorating heat transfer), does not match heat source temperature variations well

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