Nuclear electricity generation system based on Brayton cycle of supercritical carbon dioxide

Abstract

The invention specifically relates to a nuclear electricity generation system based on the Brayton cycle of supercritical carbon dioxide, belonging to the field of energy conservation and environmental protection. The nuclear electricity generation system based on the Brayton cycle of supercritical carbon dioxide comprises the Brayton recompression cycle of supercritical carbon dioxide and the Rankine cycle of transcritical carbon oxide, wherein the Brayton recompression cycle of supercritical carbon dioxide comprises seven parts, i.e., a nuclear reactor, a turbine, two compressors, a low-temperature heat regenerator, a high-temperature heat regenerator and a precooler. Under the condition of operation, the nuclear electricity generation system can reduce compression work and the like by using the properties of the actual gas of the system; and the cycles with CO2 as a working medium have efficiency equivalent to helium cycles without high temperatures.

Description

technical field [0001] The invention belongs to the field of energy conservation and environmental protection, and in particular relates to a nuclear power generation system based on a supercritical carbon dioxide Brayton cycle. Background technique [0002] With the increasing shortage of energy sources, the use of renewable energy power generation technology has been paid more and more attention. Among new energy sources, as candidate reactor types for the fourth-generation nuclear energy system, ultra-high temperature gas-cooled reactors and gas-cooled fast reactors have the characteristics of high safety, high efficiency, and wide application, and both plan to use helium as the direct cycle working fluid of the reactor. Because helium is stable, non-toxic, non-induced and radioactive, and has a large heat capacity, helium is widely used in the world's gas-cooled reactors as the working medium of the direct closed Brayton cycle and the coolant of the reactor. However, th...

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Problems solved by technology

However, the helium cycle needs a higher cycle maximum temperature (core outlet temperature) to achieve satisfactory efficiency. Therefore, higher requirements are placed on the structural materials and fuel element materials of the reactor. At the same time, due to the low density of helium, it can Due to the disadvantages of small compression coefficient, the manufacture of helium circulation impeller machinery has also caused certain difficulties

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