Supercritical CO2 Brayton cycle power generation system with electric heating energy storage function and method

Abstract

The invention discloses a supercritical CO2 Brayton cycle power generation system with an electric heating energy storage function and a method. The system comprises a supercritical CO2 Brayton cycle system, a CO2 heat pump system and a low-temperature power generation system. The supercritical CO2 Brayton cycle system comprises a heat source, a supercritical CO2 turbine, a high-temperature heat regenerator, a low-temperature heat regenerator, a precooler, a first-stage compressor, an intercooler, a second-stage compressor and a re-compressor. The CO2 heat pump system comprises a CO2 heat pump system compressor, a heat storage heat exchanger, a cooler, a main valve, a throttling device, a bypass valve, a cold storage heat exchanger, a cold storage tank and a cold water pump. The low-temperature power generation system comprises a low-temperature power generation system turbine, a heat regenerator, a cooler, a compressor, a heater, a heat storage working medium pump and a heat storage tank. According to the system, heat released by the precooler and the intercooler in the supercritical CO2 power generation system is recycled, after surplus electric energy of a power grid is adopted to drive the heat pump to improve the quality of the heat, the heat is stored, the heat is released to the low-temperature power generation system for power generation when needed, and the efficiency is obviously improved.

Description

technical field [0001] The invention relates to a power generation system, in particular to a supercritical CO with electric thermal energy storage 2 Brayton cycle power generation system and method. Background technique [0002] Under the background of energy shortage and environmental crisis, people pay more and more attention to improving energy efficiency. Among the many thermodynamic cycles, the supercritical Brayton cycle is the most advantageous cycle form. New supercritical working fluids (carbon dioxide, helium and nitrous oxide, etc.) have inherent advantages such as high energy density, high heat transfer efficiency, and simple system, which can greatly improve thermal power conversion efficiency, reduce equipment volume, and have high economic efficiency. sex. [0003] On the other hand, with the increase of new energy, especially wind power and solar photovoltaic power generation, the impact of new energy power generation on the power grid is becoming more an...

AI Technical Summary

Problems solved by technology

[0003] On the other hand, with the increase of new energy, especially wind power and solar photovoltaic power generation, the impact of new energy power generation on the power grid is becoming more and more obvious. In order to solve this problem, energy storage has attracted more and more attention. The current energy storage system includes batteries. Energy storage, compressed air energy storage, pumped water storage, etc. Battery energy storage has the highest efficiency, but the cost is too high. Compressed air energy storage needs to store a large amount of compressed air. Generally, special terrain such as caves is used to store compressed air. Pumped energy storage requires the establishment of a reservoir , also requires a considerable amount of construction

Images