Supercritical carbon dioxide Brayton cycle power generation system

Abstract

The invention belongs to the technical field of power generation and discloses a supercritical carbon dioxide Brayton cycle power generation system. According to the supercritical carbon dioxide Brayton cycle power generation system, an inlet of a main compressor is connected with a cooler, an outlet of the main compressor is connected with the low-temperature heat regenerator, an inlet of a recompressor is connected with the low-temperature heat regenerator, an outlet of the recompressor is connected with a high-temperature heat regenerator, the high-temperature heat regenerator is connectedwith an inlet of a high-pressure turbine, an inlet of a heat source is connected with the high-pressure turbine, an outlet of the heat source is connected with a low-pressure turbine, an outlet of thelow-temperature turbine is connected with the high-temperature heat regenerator, the compressors and the turbines are not coaxial, and the heat source is arranged between the high-pressure turbine and the low-pressure turbine. The supercritical carbon dioxide Brayton cycle power generation system can guarantee that the supercritical carbon dioxide Brayton cycle power generation efficiency is 40%or over and can effectively reduce the pressure of the heat source by 25%; and in this way, the supercritical carbon dioxide power generation system can adopt multiple kinds of heat sources to efficiently generate power.

Description

technical field [0001] The invention belongs to the technical field of power generation, in particular to a supercritical carbon dioxide Brayton cycle power generation system. Background technique [0002] The outlet temperature of the high-temperature heat source is in the range of 500-700°C. Both ordinary steam Rankine power cycle (30%) and high thermal efficiency (45%) supercritical Rankine cycle, helium Brayton cycle and supercritical carbon dioxide Brayton cycle can be used. The traditional steam Rankine power cycle technology is mature. Although the thermal energy conversion efficiency is low and the characteristics of high-temperature heat sources are not fully utilized, most power plants and power plants currently use steam power Rankine cycle. Some newly-built thermal power plants have adopted supercritical units and ultra-supercritical units. The pressure is 22-31MPa, and the heat energy conversion efficiency is relatively high. Under supercritical pressure, water...

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Problems solved by technology

[0003] At present, the heat source of the supercritical carbon dioxide Brayton cycle system needs to withstand a pressure of more than 20MPa, and the power generation efficiency can reach more than 40%. Therefore, the high temperature and high pressure requirements of the heat source limit the application of the supercritical carbon dioxide Brayton power generation system in various heat source fields.

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